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Sample records for kapialis jcm 12580t

  1. Analgesic effects of JCM-16021 on neonatal maternal separation-induced visceral pain in rats

    Institute of Scientific and Technical Information of China (English)

    Joseph; JY; Sung

    2010-01-01

    AIM:To investigate the pharmacological effect of JCM-16021,a Chinese herbal formula,and its underlying mechanisms.METHODS:JCM-16021 is composed of seven herbal plant materials.All raw materials of the formula were examined according to the quality control criteria listed in the Chinese Pharmacopeia(2005).In a neonatal maternal separation(NMS)model,male SpragueDawley rats were submitted to daily maternal separation from postnatal day 2 to day 14,or no specific handling(NH).Starting from postnatal day 60,rats...

  2. Characterization of a Lactobacillus gasseri JCM 1131T Lipoteichoic Acid with a Novel Glycolipid Anchor Structure

    OpenAIRE

    Shiraishi, Tsukasa; Yokota, Shin-ichi; Morita, Naoki; FUKIYA, Satoru; Tomita, Satoru; Tanaka, Naoto; Okada, Sanae; Yokota, Atsushi

    2013-01-01

    We determined the chemical structure of lipoteichoic acid (LTA) from Lactobacillus gasseri JCM 1131(T). The repeating unit was comprised of glycerolphosphate and 2-alanylglycerolphosphate. The glycolipid anchor was tetrahexosylglycerol with two or three acyl groups. To our knowledge, this is the first demonstration of a tetrahexose structure in an LTA glycolipid anchor.

  3. Purification and properties of thiosulfate dehydrogenase from Acidithiobacillus thiooxidans JCM7814.

    Science.gov (United States)

    Nakamura, K; Nakamura, M; Yoshikawa, H; Amano, Y

    2001-01-01

    A key enzyme of the thiosulfate oxidation pathway in Acidithiobacillus thiooxidans JCM7814 was investigated. As a result of assaying the enzymatic activities of thiosulfate dehydrogenase, rhodanese, and thiosulfate reductase at 5.5 of intracellular pH, the activity of thiosulfate dehydrogenase was measured as the key enzyme. The thiosulfate dehydrogenase of A. thiooxidans JCM7814 was purified using three chromatographies. The purified sample was electrophoretically homogeneous. The molecular mass of the enzyme was 27.9 kDa and it was a monomer. This enzyme had cytochrome c. The optimum pH and temperature of this enzyme were 3.5 and 35 degrees C. The enzyme was stable in the pH range from 5 to 7, and it was stable up to 45 degrees C. The isoelectric point of the enzyme was 8.9. This enzyme reacted with thiosulfate as a substrate. The Km was 0.81 mM.

  4. Draft Genome Sequence of Lactobacillus crispatus JCM5810, Which Can Reduce Campylobacter jejuni Colonization in Chicken Intestine.

    Science.gov (United States)

    Wooten, Jessica; Liu, Xiaoji; Miller, Michael J

    2016-04-14

    We present the 2.05-Mb draft genome sequence ofLactobacillus crispatusJCM5810, a chicken intestinal isolate with the ability to reduceCampylobacter jejunicolonization in chickens. The genome sequence will provide insights on the probiotic mechanisms ofL. crispatusJCM5810.

  5. Complete genome of Cobetia marina JCM 21022T and phylogenomic analysis of the family Halomonadaceae

    Science.gov (United States)

    Tang, Xianghai; Xu, Kuipeng; Han, Xiaojuan; Mo, Zhaolan; Mao, Yunxiang

    2016-09-01

    Cobetia marina is a model proteobacteria in researches on marine biofouling. Its taxonomic nomenclature has been revised many times over the past few decades. To better understand the role of the surface-associated lifestyle of C. marina and the phylogeny of the family Halomonadaceae, we sequenced the entire genome of C. marina JCM 21022T using single molecule real-time sequencing technology (SMRT) and performed comparative genomics and phylogenomics analyses. The circular chromosome was 4 176 300 bp with an average GC content of 62.44% and contained 3 611 predicted coding sequences, 72 tRNA genes, and 21 rRNA genes. The C. marina JCM 21022T genome contained a set of crucial genes involved in surface colonization processes. The comparative genome analysis indicated the significant diff erences between C. marina JCM 21022T and Cobetia amphilecti KMM 296 (formerly named C. marina KMM 296) resulted from sequence insertions or deletions and chromosomal recombination. Despite these diff erences, pan and core genome analysis showed similar gene functions between the two strains. The phylogenomic study of the family Halomonadaceae is reported here for the first time. We found that the relationships were well resolved among every genera tested, including Chromohalobacter, Halomonas, Cobetia, Kushneria, Zymobacter, and Halotalea.

  6. Genome-guided insight into the methylotrophy of Paracoccus aminophilus JCM 7686

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    Lukasz eDziewit

    2015-08-01

    Full Text Available Paracoccus aminophilus JCM 7686 (Alphaproteobacteria is a facultative, heterotrophic methylotroph capable of utilizing a wide range of C1 compounds as sole carbon and energy sources. Analysis of the JCM 7686 genome revealed the presence of genes involved in the oxidation of methanol, methylamine, dimethylamine, trimethylamine, N,N-dimethylformamide and formamide, as well as the serine cycle, which appears to be the only C1 assimilatory pathway in this strain. Many of these genes are located in different extrachromosomal replicons and are not present in the genomes of most members of the genus Paracoccus, which strongly suggests that they have been horizontally acquired. When compared with Paracoccus denitrificans Pd1222 (type strain of the genus Paracoccus, P. aminophilus JCM 7686 has many additional methylotrophic capabilities (oxidation of dimethylamine, trimethylamine, N,N-dimethylformamide, the serine cycle, which are determined by the presence of three separate gene clusters. Interestingly, related clusters form compact methylotrophy islands within the genomes of Paracoccus sp. N5 and many marine bacteria of the Roseobacter clade.

  7. Production of Glycolipid Biosurfactants, cellobiose lipids, by Cryptococcus humicola JCM 1461 and their interfacial properties.

    Science.gov (United States)

    Morita, Tomotake; Ishibashi, Yuko; Fukuoka, Tokuma; Imura, Tomohiro; Sakai, Hideki; Abe, Masahiko; Kitamoto, Dai

    2011-01-01

    Cryptococcus humicola JCM 1461 efficiently produced cellobiose lipids (CLs), bolaform biosurfactants. The main product was identified as 16-O-(2″,3″,4″,6'-tetra-O-acetyl-β-cellobiosyl)-2-hydroxyhexadecanoic acid. The production yield of CLs reached 13.1 g/L under the intermittent feeding of glucose. The critical micelle concentrations (CMC) of the main product at pH 4.0 and 7.0 were 3.3×10(-5) M and 4.1×10(-4) M respectively.

  8. Efficient cyclic system to yield ectoine using Brevibacterium sp. JCM 6894 subjected to osmotic downshock.

    Science.gov (United States)

    Nagata, Shinichi; Wang, Yaoqiang; Oshima, Akinobu; Zhang, Linghua; Miyake, Hideyoshi; Sasaki, Hideaki; Ishida, Akio

    2008-03-01

    Brevibacterium sp. JCM 6894 cells grown in the presence of 1.5-2.5 M NaCl for 24 h at 30 degrees C were subjected to the osmotic downshock. Downshocked cells after ectoine release were grown for further 24 h in the fresh medium with same salinity as before shock. When this cyclic system was applied to the strain JCM 6894, the amount of ectoine in the cells increased with an increase of incubation time, which indicates that the cells manipulated by the present conditions were enough active to survive and synthesize ectoine after several times of osmotic downshock. In the presence of 2 M NaCl, the highest yield of ectoine released was achieved in this cyclic system, more than 2.4 g/L during 7 days of incubation. (1)H and (13)C-NMR analyses of solutes released from the cells by the osmotic downshock showed the presence of only ectoine with high purity. Release of ectoine from the cells was carried out within 5 min and its rates were increased by the dilution in the downshock treatment. For the convenience of operations, non-sterilized medium containing 2 M NaCl was examined for the cell growth in the present system, in which almost same level of ectoine yield, release rates, and cell viability were observed as those of sterilized medium.

  9. Inhibition of Fusarium solani Infection in Murine Keratocytes by Lactobacillus salivarius ssp. salivarius JCM1231 Culture Filtrate In Vitro.

    Science.gov (United States)

    Hu, Jianzhang; Chen, Fang; Kan, Tong; Zhuang, Hua; Zhang, Jingjin; Han, Xiaoli

    2017-06-21

    To explore the inhibitory activity of Lactobacillus salivarius ssp. salivarius JCM1231 (L. salivarius JCM1231) culture filtrate against Fusarium solani (F. solani) and its effects on murine keratocytes (MKs) infected with F. solani. L. salivarius JCM1231 was cultured in an anaerobic incubator for 24 h, and the L. salivarius culture filtrate (LSCF) was prepared .The antifungal activity of L. salivarius JCM1231 against F. solani was determined with a plate overlay assay, agar diffusion assay, and conidial germination inhibition test. The effects of temperature, pH, and proteolytic enzymes on the antifungal activity of LSCF were detected with microtiter plate-well assay and conidial germination inhibition assay. Furthermore, the effects of LSCF on MKs infected with F. solani were detected. Cell activity and apoptosis were measured using methylthiazoletetrazolium assays and flow cytometry analysis, respectively. The levels of interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) cytokines were measured using real-time polymerase chain reactions and enzyme-linked immunosorbent assays (ELISA), and mycotoxin production was detected with high-performance liquid chromatography tandem mass spectrometry. Conidial germination and mycelia growth of F. solani were significantly inhibited by LSCF. The antifungal substances produced by L. salivarius JCM1231 were heat unstable, proteinaceous, and sensitive to proteolytic enzymes and were active within a narrow acidic pH range between 2.0 and 4.0. In the presence of 15 µg/ml of LSCF, cell activity was significantly increased, and cell apoptosis, the level of IL-6 and TNF-α expressions, and mycotoxin (zearalenone and fumonisin B1) productions were decreased significantly in MKs infected with F. solani. L. salivarius JCM1231 culture filtrate can effectively inhibit F. solani growth and protect MKs against F. solani infection.

  10. Simulation of kefiran production of Lactobacillus kefiranofaciens JCM6985 in fed-batch reactor

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    Benjamas Cheirsilp

    2006-09-01

    Full Text Available Kinetics of kefiran production by Lactobacillus kefiranofaciens JCM6985 has been investigated. A mathematical model taking into account the mechanism of exopolysaccharides production has been developed. Experiments were carried out in batch mode in order to obtain kinetic model parameters that were further applied to simulate fed-batch processes. A simplification of parameter fitting was also introduced for complicated model. The fed-batch mode allows more flexibility in the control of the substrate concentration as well as product concentration in the culture medium. Based on the batch mathematical model, a fed-batch model was developed and simulations were done. Simulation study in fed-batch reactor resulted that substrate concentration should be controlled at 20 g L-1 to soften the product inhibition and also to stimulate utilization of substrate and its hydrolysate. From simulation results of different feeding techniques, it was found that constant feeding at 0.01 L h-1 was most practically effective feeding profile for exopolysaccharides production in fed-batch mode.

  11. Transcriptome of intraperitoneal organs of starry flounder Platichthys stellatus challenged by Edwardsiella ictaluri JCM1680

    Science.gov (United States)

    Tong, Yanli; Sun, Xiuqin; Wang, Bo; Wang, Ling; Li, Yan; Tian, Jinhu; Zheng, Fengrong; Zheng, Minggang

    2015-01-01

    Platichthys stellatus is an economically important marine bony fish species that is cultured in China on a large scale. However, very little is known about its immune-related genes. In this study, the transcriptome of the immune organs of P. stellatus that were intraperitoneally challenged with the pathogen E dwardsiella ictaluri JCM1680 is analyzed. Total RNA from four tissues (spleen, kidney, liver, and intestine) was mixed equally and then sequenced on an Illumina HiSeq 2000 platform. Overall, 28 465 813 quality reads were generated and assembled into 43 061 unigenes. Similarity searches against public protein sequence databases were used to annotate 28 291 unigenes (65.7% of the total), 368 of which were associated with immunoregulation, including 188 related to immunity response. Additionally, the transcript levels of immunity response unigenes annotated as related to tumor necrosis factor (TNF), TNF receptor, chemokine, major histocompatibility complex, and interleukin-6 were investigated in the different tissues of normal and infected P. stellatus by real-time quantitative PCR. The results confirmed that the unigenes identified in the transcriptome database were indeed expressed and up-regulated in infected P. stellatus. To our knowledge, this is the first report of the sequencing and analysis of the transcriptome of P. stellatus. These findings provide insights into the transcriptomics and immunogenetics of bony fish.

  12. The Janus Cosmological Model (JCM) : An answer to the missing cosmological antimatter

    Science.gov (United States)

    D'Agostini, Gilles; Petit, Jean-Pierre

    2017-01-01

    Cosmological antimatter absence remains unexplained. Twin universes 1967 Sakarov's model suggests an answer: excess of matter and anti-quarks production in our universe is balanced by equivalent excess of antimatter and quark in twin universe. JCM provides geometrical framework, with a single manifold , two metrics solutions of two coupled field equations, to describe two populations of particles, one with positive energy-mass and the other with negative energy-mass : the `twin matter'. In a quantum point of view, it's a copy of the standard matter but with negative mass and energy. The matter-antimatter duality holds in both sectors. The standard and twin matters do not interact except through the gravitational coupling expressed in field equations. The twin matter is unobservable from matter-made apparatus. Field equations shows that matter and twin matter repel each other. Twin matter surrounding galaxies explains their confinement (dark matter role) and, in the dust universe era, mainly drives the process of expansion of the positive sector, responsible of the observed acceleration (dark energy role).

  13. Purification and crystallographic analysis of a FAD-dependent halogenase from Streptomyces sp. JCM9888.

    Science.gov (United States)

    Zhao, Yanqun; Yan, Baohua; Yang, Ting; Jiang, Jian; Wei, Heng; Zhu, Xiaofeng

    2015-08-01

    A new FAD (flavin adenine dinucleotide)-dependent halogenase HalY from Streptomyces sp. JCM9888 was reported to be involved in the regioselective halogenation of adenine. HalY is a variant B FAD-dependent halogenase that is most similar to the halogenase PltA involved in pyoluteorin biosynthesis. This study reports the overexpression and purification of HalY with an N-terminal hexahistidine tag, followed by crystallization experiments and X-ray crystallographic analysis. HalY was purified as a monomer in solution and crystallized to give X-ray diffraction to a resolution of 1.7 Å. The crystal belonged to the monoclinic space group P21, with unit-cell parameters a = 41.4, b = 113.4, c = 47.6 Å, α = γ = 90, β = 107.4°, and contained one monomer of HalY in the asymmetric unit, with a calculated Matthews coefficient of 2.3 Å(3) Da(-1) and a solvent content of 46%. The structure of the halogenase CndH was used as a search model in molecular replacement to obtain the initial model of HalY. Manual model building and structure refinement of HalY are in progress.

  14. High-level folate production in fermented foods by the B12 producer Lactobacillus reuteri JCM1112

    NARCIS (Netherlands)

    F. Santos; A. Wegkamp; W.M. de Vos; E.J. Smid; J. Hugenholtz

    2008-01-01

    We observed that Lactobacillus reuteri JCM1112 produces B12 and folate. However, the folate/B12 mass ratio found was far below that desired for human consumption (~170:1). We used metabolic engineering applying genetic and physiological approaches to improve this ratio and developed a generic and na

  15. Complete Genome Sequence of Rothia aeria Type Strain JCM 11412, Isolated from Air in the Russian Space Laboratory Mir.

    Science.gov (United States)

    Nambu, Takayuki; Tsuzukibashi, Osamu; Uchibori, Satoshi; Yamane, Kazuyoshi; Yamanaka, Takeshi; Maruyama, Hugo; Wang, Pao-Li; Mugita, Naho; Morioka, Hiroki; Takahashi, Kazuya; Komasa, Yutaka; Mashimo, Chiho

    2016-12-29

    Here, we present the complete genome sequence of Rothia aeria type strain JCM 11412, isolated from air in the Russian space laboratory Mir. Recently, there has been an increasing number of reports on infections caused by R. aeria The genomic information will enable researchers to identify the pathogenicity of this organism.

  16. Draft Genome Sequence of Bacteroides reticulotermitis Strain JCM 10512T, Isolated from the Gut of a Termite

    OpenAIRE

    Yuki, Masahiro; Oshima, Kenshiro; Suda, Wataru; Sakamoto, Mitsuo; Iida, Toshiya; Hattori, Masahira; Ohkuma, Moriya

    2014-01-01

    Here we report the draft genome sequence of Bacteroides reticulotermitis strain JCM 10512T, a xylanolytic and cellulolytic bacterium isolated from the gut of a wood-feeding termite. The genome information will facilitate the study of this strain for biomass degradation and adaptation to the gut environment.

  17. Hydration and transparency of the rabbit cornea irradiated with UVB-doses of 0.25 J/cm(2) and 0.5 J/cm(2) compared with equivalent UVB radiation exposure reaching the human cornea from sunlight.

    Science.gov (United States)

    Cejka, Cestmír; Ardan, Taras; Sirc, Jakub; Michálek, Jiří; Beneš, Jiří; Brůnová, Blanka; Rosina, Jozef

    2011-07-01

    Exposure of the cornea to UV radiation from sunlight evokes intraocular inflammation, photokeratitis. Photokeratitis is caused by UVB radiation. It is accompanied by changes of corneal hydration and light absorption. The aim of this study was to examine the effect of two UVB doses on corneal optics in rabbits and to compare these UVB doses with the equivalent exposure of UVB radiation reaching the human cornea from sunlight. Rabbit corneas were irradiated with a daily UVB dose of 0.25 J/cm(2) or 0.5 J/cm(2) for 4 days. One day after finishing the irradiations the rabbits were sacrificed and corneal light absorption measured using our spectrophotometrical method. Corneal hydration was examined using an ultrasonic Pachymeter every experimental day before the irradiation procedure and the last day before sacrificing the animals. Changes in corneal optics appeared after the repeated exposure of the cornea to a UVB dose of 0.25 J/ cm(2) and massively increased after the repeated exposure of the cornea to a UVB dose of 0.5 J/cm(2). The first significant changes in corneal hydration appeared after a single exposure of the cornea to a UVB dose of 0.25 J/cm(2). Changes in corneal hydration appeared after the exposure of the rabbit cornea to a single UVB dose equivalent to 2.6 hours of solar UVB radiation reaching the human cornea, as measured by UVB sensors embedded in the eyes of mannequin heads facing the sun on a beach at noon in July. Repeated exposure of the rabbit cornea to the same UVB dose evoked profound changes in corneal optics. Although comparison of experimental and outdoor conditions are only approximate, the results in rabbits point to the danger for the human eye from UVB radiation when short stays in sunlight are repeated for several consecutive days without UV protection.

  18. The study on the candidate probiotic properties of encapsulated yeast, Saccharomyces cerevisiae JCM 7255, in Nile Tilapia (Oreochromis niloticus).

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    Pinpimai, Komkiew; Rodkhum, Channarong; Chansue, Nantarika; Katagiri, Takayuki; Maita, Masashi; Pirarat, Nopadon

    2015-10-01

    Saccharomyces cerevisiae JCM 7255 was tested as a probiotic candidate in tilapia after encapsulating and freeze drying. Viability and morphology during storage and during transit through simulated gut and bile conditions were determined. Growth performance, anti-streptococcal activity and gut mucosal immune parameters were also tested. The viability of encapsulated yeasts was significantly high in simulated gastric and bile conditions and remained high after storage at room temperature for 14 days. The morphology of free S. cerevisiae revealed rough, bumpy, ruptured surface during incubation in gut and bile conditions. Agar spot anti-streptococcal activity showed inhibition of 20 out of 30 strains of Streptococcus agalactiae. Supplementation improved the intestinal structure and growth performance in tilapias. Intraepithelial lymphocytes in the proximal intestine were significantly observed. Lower cumulative mortality after the oral streptococcal challenge was also seen. The results suggest that encapsulated S. cerevisiae JCM 2755 could be a potential probiotic strain in tilapia culture.

  19. Lactobacillus rhamnosus JCM 2771: impact on metabolism of isoflavonoids in the fecal flora from a male equol producer.

    Science.gov (United States)

    Tamura, Motoi; Hori, Sachiko; Nakagawa, Hiroyuki

    2011-05-01

    Many beneficial effects of probiotics have been reported; however, few have focussed on the effects of Lactobacillus, a probiotic, on the bioconversion of isoflavonoids. We hypothesized that Lactobacillus rhamnosus will modify the metabolism of isoflavone. In an in vitro incubation, L. rhamnosus JCM 2771 produced daidzein from daidzin along with genistein. However, daidzin and genistein were not detected in the incubation solution of daidzein with L. rhamnosus. In the fecal suspension from a male equol producer with daidzein, equol was detected in the presence of a low or high concentration of L. rhamnosus. In the fecal incubation with daidzin, the equol concentration increased with an increasing concentration of L. rhamnosus JCM 2771. L. rhamnosus affected the equol production in the in vitro incubation of daidzein with fecal flora from a male equol producer. We demonstrated for the first time that L. rhamnosus JCM 2771 could produce genistein from daidzin and affect the equol production of fecal flora from a male equol producer in vitro.

  20. Identification of a protein glycosylation operon from Campylobacter jejuni JCM 2013 and its heterologous expression in Escherichia coli.

    Science.gov (United States)

    Srichaisupakit, Akkaraphol; Ohashi, Takao; Fujiyama, Kazuhito

    2014-09-01

    Campylobacter jejuni is a human enteropathogenic bacterium possessing an N-glycosylation system. In this work, a protein glycosylation (pgl) operon conferring prokaryotic N-glycosylation in C. jejuni JCM 2013 was cloned and identified. Fourteen open reading frames (ORFs) were found in the pgl operon. The operon organization was similar to that of C. jejuni NCTC 11168, with 98% and 99% identities in overall nucleotide sequence and amino acid sequence, respectively. The pgl operon was heterologously co-expressed with model protein CmeA in the Escherichia coli BL21 ΔwaaL mutant. The immuno- and lectin-blotting analysis indicated the protein glycosylation on the recombinant CmeA. In addition, to analyze the glycan composition, the recombinant CmeA was purified and subjected to in-gel trypsin digestion followed by mass spectrometry analysis. The mass spectrometry analysis showed the presence of the N-acetylhexosamine residue at the reducing end but not the predicted di-N-acetylbacillosamine (diNAcBac) residue. Further glycan structural study using the conventional fluorophore-labeling method revealed the GalNAcα-GalNAcα-(Hex-)HexNAc-HexNAc-HexNAc-HexNAc structure. Transcriptional analysis showed that UDP-diNAcBac synthases and diNAcBac transferase are transcribed but might not function in the constructed system. In conclusion, a pgl operon from C. jejuni JCM 2013 successfully functioned in E. coli, resulting in the observed prokaryotic glycosylation.

  1. Oral administration of Lactococcus lactis subsp. lactis JCM5805 enhances lung immune response resulting in protection from murine parainfluenza virus infection.

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    Kenta Jounai

    Full Text Available When activated by viral infection, plasmacytoid dendritic cells (pDCs play a primary role in the immune response through secretion of IFN-α. Lactococcus lactis subsp. lactis JCM5805 (JCM5805 is a strain of lactic acid bacteria (LAB that activates murine and human pDCs to express type I and type III interferons (IFNs. JCM5805 has also been shown to activate pDCs via a Toll-like receptor 9 (TLR9 dependent pathway. In this study, we investigated the anti-viral effects of oral administration of JCM5805 using a mouse model of murine parainfluenza virus (mPIV1 infection. JCM5805-fed mice showed a drastic improvement in survival rate, prevention of weight loss, and reduction in lung histopathology scores compared to control mice. We further examined the mechanism of anti-viral effects elicited by JCM5805 administration using naive mice. Microscopic observations showed that JCM5805 was incorporated into CD11c+ immune cells in Peyer's patches (PP and PP pDCs were significantly activated and the expression levels of IFNs were significantly increased. Interestingly, nevertheless resident pDCs at lung were not activated and expressions levels of IFNs at whole lung tissue were not influenced, the expressions of anti-viral factors induced by IFNs, such as Isg15, Oasl2, and Viperin, at lung were up-regulated in JCM5805-fed mice compared to control mice. Therefore expressed IFNs from intestine might be delivered to lung and IFN stimulated genes might be induced. Furthermore, elevated expressions of type I IFNs from lung lymphocytes were observed in response to mPIV1 ex vivo stimulation in JCM5805-fed mice compared to control. This might be due to increased ratio of pDCs located in lung were significantly increased in JCM5805 group. Taken together, a specific LAB strain might be able to affect anti-viral immunological profile in lung via activation of intestinal pDC leading to enhanced anti-viral phenotype in vivo.

  2. JCM-16021, a Chinese Herbal Formula, Attenuated Visceral Hyperalgesia in TNBS-Induced Postinflammatory Irritable Bowel Syndrome through Reducing Colonic EC Cell Hyperplasia and Serotonin Availability in Rats.

    Science.gov (United States)

    Qin, Hong-Yan; Xiao, Hai-Tao; Leung, Fung-Ping; Yang, Zhi-Jun; Wu, Justin C Y; Sung, Joseph J Y; Xu, Hong-Xi; Tong, Xu-Dong; Bian, Zhao-Xiang

    2012-01-01

    The present study aimed to investigate the analgesic effect of JCM-16021, a revised traditional Chinese herbal formula, on postinflammatory irritable bowel syndrome (PI-IBS) in rats. The trinitrobenzene sulfonic (TNBS) acid-induced PI-IBS model rats were orally administrated with different doses of JCM-16021 (1.2, 2.4, and 4.8 g/kg/d) for 14 consecutive days. The results showed that JCM-16021 treatment dose-dependently attenuated visceral hyperalgesia in PI-IBS rats. Further, the colonic enterochromaffin (EC) cell number, serotonin (5-HT) content, tryptophan hydroxylase expression, and mechanical-stimuli-induced 5-HT release were significantly ameliorated. Moreover, the decreased levels of mucosal cytokines in PI-IBS, especially the helper T-cell type 1- (T(h)1-) related cytokine TNF-α, were also elevated after JCM-16021 treatment. These data demonstrate that the analgesic effect of JCM-16021 on TNBS-induced PI-IBS rats may be medicated via reducing colonic EC cell hyperplasia and 5-HT availability.

  3. JCM-16021, a Chinese Herbal Formula, Attenuated Visceral Hyperalgesia in TNBS-Induced Postinflammatory Irritable Bowel Syndrome through Reducing Colonic EC Cell Hyperplasia and Serotonin Availability in Rats

    Directory of Open Access Journals (Sweden)

    Hong-Yan Qin

    2012-01-01

    Full Text Available The present study aimed to investigate the analgesic effect of JCM-16021, a revised traditional Chinese herbal formula, on postinflammatory irritable bowel syndrome (PI-IBS in rats. The trinitrobenzene sulfonic (TNBS acid-induced PI-IBS model rats were orally administrated with different doses of JCM-16021 (1.2, 2.4, and 4.8 g/kg/d for 14 consecutive days. The results showed that JCM-16021 treatment dose-dependently attenuated visceral hyperalgesia in PI-IBS rats. Further, the colonic enterochromaffin (EC cell number, serotonin (5-HT content, tryptophan hydroxylase expression, and mechanical-stimuli-induced 5-HT release were significantly ameliorated. Moreover, the decreased levels of mucosal cytokines in PI-IBS, especially the helper T-cell type 1- (Th1- related cytokine TNF-α, were also elevated after JCM-16021 treatment. These data demonstrate that the analgesic effect of JCM-16021 on TNBS-induced PI-IBS rats may be medicated via reducing colonic EC cell hyperplasia and 5-HT availability.

  4. 长双歧杆菌亚种JCM1217基因组分泌蛋白的分析%Genome-wide Analysis of the Secretory Proteins of Bifidobacterium Longum Subsp. JCM 1217

    Institute of Scientific and Technical Information of China (English)

    张秀红; 王颖; 段江燕

    2012-01-01

    Objective:Bifidobaeterium are important human intestinal probiotics, analysis of their secretory proteins will help us to correctly understand its physiological function and molecular mechanisms of interaction with their host. Methods:The amino acid sequence of Bifidobacterium longitm subsp. JCM 1217 genome proteins were obtained from Gen-Bank. Using SignalP v3.0, TMHMM 2.0, TatP, LipoPl.O, GPI, DOLOP software analyze the function of secretory proteins and the type and characteristic of these secretory proteins and their signal peptides. Results;A total of 58 secretion proteins through Sec pathway (including one through Tat pathway), 142 non-classical secretory proteins were screened. The secretory proteins from Sec pathway included secreted proteins recognized by Spase Ⅰ and Spase Ⅱ. Most of their signal peptide length are 25 and 28aa, respectively; The distribution and the average length of Spase Ⅱ secretory proteins were smaller than that of Spase I secretory proteins. The usage frequencies of alanine on the cleavage site left position -3, -2 and -1 of Bifidobacterium signal peptide and the mature protein were 61.11%, 19.4% and 83.33%, respectively, belonged to typically A-X-A signal peptide recognition sites structure. About to the functions of Bifidobacterium secretory protein, there were many hypothetical proteins in every type secretory proteins. Besides that, Spase Ⅰ type secretory proteins encoded a number of enzymes related to metabolism, while the hydrolyses were little; Spase Ⅱ type of secretory proteins are mainly related to ABC transporter proteins; the functions of non-classical secretory proteins were very complex, including enzymes with regard to metabolism and cell wall synthesis, DNA replication and gene expression related protein and other functional proteins. Conclusion;The secretory protein and their signal peptide from Bifidobacterium longwn subsp. JCM 1217 are similar to that from other Gram-positive bacteria. The functions of

  5. A C69-family cysteine dipeptidase from Lactobacillus farciminis JCM1097 possesses strong Gly-Pro hydrolytic activity.

    Science.gov (United States)

    Sakamoto, Takuma; Otokawa, Takuya; Kono, Ryosuke; Shigeri, Yasushi; Watanabe, Kunihiko

    2013-11-01

    Dipeptide Gly-Pro, a hard-to-degrade and collagenous peptide, is thought to be hydrolysed by prolidases that can work on various X-Pro dipeptides. Here, we found an entirely different type of dipeptidase from Lactobacillus farciminis JCM1097 that cleaves Gly-Pro far more efficiently and with higher specificity than prolidases, and then investigated its properties by use of a recombinant enzyme. Although L. farciminis dipeptidase was expressed in the form of an inclusion body in Escherichia coli at 37 °C, it was smoothly over-expressed in a soluble form at a lower temperature. The maximal Gly-Pro hydrolytic activity was attained in E. coli at 30 °C. In contrast to prolidases that are metallopeptidases showing the modest or marginal activity toward Gly-Pro, this L. farciminis dipeptidase belongs to the cysteine peptidase family C69. Lactobacillus farciminis dipeptidase occurs in cytoplasm and utilizes the side chain of an amino-terminal cysteine residue to perform the nucleophilic attack on the target amide bond between Gly-Pro after processing eight amino acid residues at the N-terminus. Furthermore, L. farciminis dipeptidase is potent enough to synthesize Gly-Pro from Gly and Pro by a reverse reaction. These novel properties could be revealed by virtue of the success in preparing recombinant enzymes in higher yield and in a stable form.

  6. Expression of cbsA encoding the collagen-binding S-protein of Lactobacillus crispatus JCM5810 in Lactobacillus casei ATCC 393T

    NARCIS (Netherlands)

    Martínez, B.; Sillanpää, J.; Smit, E.; Korhonen, T.K.; Pouwels, P.H.

    2000-01-01

    The cbsA gene encoding the collagen-binding S-layer protein of Lactobacillus crispatus JCM5810 was expressed in L. casei ATCC 393T. The S-protein was not retained on the surface of the recombinant bacteria but was secreted into the medium. By translational fusion of CbsA to the cell wall sorting

  7. Expression of cbsA encoding the collagen-binding S-protein of Lactobacillus crispatus JCM5810 in Lactobacillus casei ATCC 393T

    NARCIS (Netherlands)

    Martínez, B.; Sillanpää, J.; Smit, E.; Korhonen, T.K.; Pouwels, P.H.

    2000-01-01

    The cbsA gene encoding the collagen-binding S-layer protein of Lactobacillus crispatus JCM5810 was expressed in L. casei ATCC 393T. The S-protein was not retained on the surface of the recombinant bacteria but was secreted into the medium. By translational fusion of CbsA to the cell wall sorting sig

  8. Effect of duration of osmotic downshock and coexisting glutamate on survival and uptake of ectoine in halotolerant Brevibacterium sp. JCM 6894.

    Science.gov (United States)

    Nagata, Shinichi; Wang, Chenxiang

    2006-01-01

    Halotolerant Brevibacterium sp. JCM 6894 that was subjected to an osmotic downshock (0.7 M NaCl to 0 M) was examined for its survival and uptake of ectoine in the presence of ectoine and/or carbon sources. In the presence of ectoine alone, the rates of ectoine uptake by the 1 h-downshocked cells were low and high in the absence and presence of 0.7 M NaCl, respectively, which were in parallel with the rates of cell growth. The presence of glutamate or amino acids together with ectoine exerted a stimulative effect on the survival of downshocked cells. The incubation time of the cells subjected to osmotic downshock strongly affected ectoine uptake as well as the cell growth of this strain, suggesting that the transporter of ectoine in the strain JCM 6894 was stimulated during the osmotic downshock for about 1 h. Different downshock strengths had marked effects on the rate of ectoine uptake when the downshocked cells were incubated in the presence of NaCl.

  9. Morphological analysis of second-intention wound healing in rats submitted to 16 J/cm 2 λ 660-nm laser irradiation

    Directory of Open Access Journals (Sweden)

    Gonzaga Ribeiro Maria

    2009-01-01

    Full Text Available Background and Objectives : Low-level laser therapy (LLLT has been extensively applied to improve wound healing due to some biostimulatory properties presented by laser arrays apparently able to accelerate the cicatricial repair of soft tissue injuries. However, many controversial results have been reported in the literature, probably as a result of the wide sort of different protocols of photobiomodulation employed in those experiments. The goal of this study was to investigate the effect of a low-dose protocol of LLT on the intensity of the inflammatory response and the pattern of collagen fibers′ deposition during second-intention wound healing in rodents. Materials and Methods : Standard-sized wounds were carried out in the back of 24 male rats. Half of them underwent LLLT treatment (16 J/cm 2 at 660 nm delivered for 7 days. Eight and 14 days after the wounds were performed, the repairing area was removed and stained in HE and Masson′s trichrome, and the inflammatory response, epithelization, and collagen fiber depositions were evaluated. Results : We found that LLLT was able to slightly reduce the intensity of the inflammatory reaction as well as to enhance substantially the epithelization process at both 8 th and 14 th days. In addition, it also appeared to stimulate the deposition of collagen fibers at the final stages of wound healing. Conclusions : The LLLT protocol tested in this study resulted in some improvements in second-intention wound healing in rodents.

  10. Low-level laser therapy, at 60 J/cm2 associated with a Biosilicate® increase in bone deposition and indentation biomechanical properties of callus in osteopenic rats

    Science.gov (United States)

    Fangel, Renan; Sérgio Bossini, Paulo; Cláudia Renno, Ana; Araki Ribeiro, Daniel; Chenwei Wang, Charles; Luri Toma, Renata; Okino Nonaka, Keico; Driusso, Patrícia; Antonio Parizotto, Nivaldo; Oishi, Jorge

    2011-07-01

    We investigate the effects of a novel bioactive material (Biosilicate®) and low-level laser therapy (LLLT), at 60 J/cm2, on bone-fracture consolidation in osteoporotic rats. Forty female Wistar rats are submitted to the ovariectomy, to induce osteopenia. Eight weeks after the ovariectomy, the animals are randomly divided into four groups, with 10 animals each: bone defect control group; bone defect filled with Biosilicate group; bone defect irradiated with laser at 60 J/cm2 group; bone defect filled with Biosilicate and irradiated with LLLT, at 60 J/cm2 group. Laser irradiation is initiated immediately after surgery and performed every 48 h for 14 days. Histopathological analysis points out that bone defects are predominantly filled with the biomaterial in specimens treated with Biosilicate. In the 60-J/cm2 laser plus Biosilicate group, the biomaterial fills all bone defects, which also contained woven bone and granulation tissue. Also, the biomechanical properties are increased in the animals treated with Biosilicate associated to lasertherapy. Our results indicate that laser therapy improves bone repair process in contact with Biosilicate as a result of increasing bone formation as well as indentation biomechanical properties.

  11. Effects of oakmoss and its components on Acanthamoeba castellanii ATCC 30234 and the uptake of Legionella pneumophila JCM 7571 (ATCC 33152) into A. castellanii.

    Science.gov (United States)

    Nomura, Harue; Isshiki, Yasunori; Sakuda, Keisuke; Sakuma, Katsuya; Kondo, Seiichi

    2015-01-01

    Acanthamoeba castellanii, a ubiquitous organism in water environments, is pathogenic toward humans and also is a host for bacteria of the genus Legionella, a causative agent of legionellosis. Oakmoss, a natural fragrance ingredient, and its components are antibacterial agents specifically against the genus Legionella. In the present study, oakmoss and its components were investigated for their amoebicidal activity against A. castellanii ATCC 30234 and the inhibitory effect on the uptake of L. pneumophila JCM 7571 (ATCC 33152) into A. castellanii. The oakmoss and its components 3-hydroxy-5-methylphenyl 2,4-dihydroxy-6-methylbenzoate(5), and 6,8-dihydroxy-3-pentyl-1H-isochromen-1-one (12) exhibited high amoebicidal activity (IC50 values; 10.5 ± 2.3, 16.3 ± 4.0 and 17.5 ± 2.8 μg/mL, respectively) after 48 h of treatment, which were equivalent to that of the reference compound, chlorhexidine gluconate. Pretreatment of L. pneumophila with sub-minimal inhibitory concentration of oakmoss, compound 5, 3-hydroxy-5-methylphenyl 2-hydroxy-4-methoxy-6-methylbenzoate (10) and 8-(2,4-dihydroxy-6-pentylphenoxy)-6-hydroxy-3-pentyl-1H-isochromen-1-one (14) obviously reduced the uptake of L. pneumophila into A.castellanii (p < 0.05).The inhibitory effect of compound 5 on the uptake of L. pneumophila was almost equivalent to that of ampicillin used as a reference. Thus, the oakmoss and its components were considered to be good candidates for disinfectants against not only genus Legionella but also A. castellanii.

  12. Purification, crystallization and preliminary X-ray analysis of the galacto-N-biose-/lacto-N-biose I-binding protein (GL-BP) of the ABC transporter from Bifidobacterium longum JCM1217

    Energy Technology Data Exchange (ETDEWEB)

    Wada, Jun [Graduate School of Biostudies, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502 (Japan); Suzuki, Ryuichiro; Fushinobu, Shinya [Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657 (Japan); Kitaoka, Motomitsu [National Food Research Institute, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642 (Japan); Wakagi, Takayoshi; Shoun, Hirofumi [Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657 (Japan); Ashida, Hisashi [Graduate School of Biostudies, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502 (Japan); Kumagai, Hidehiko; Katayama, Takane, E-mail: takane@ishikawa-pu.ac.jp [Research Institute for Bioresources and Biotechnology, Ishikawa Prefectural University, Nonoichi, Ishikawa 921-8836 (Japan); Yamamoto, Kenji [Graduate School of Biostudies, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502 (Japan)

    2007-09-01

    Preliminary X-ray analysis of the galacto-N-biose-/lacto-N-biose I-binding protein (GL-BP) of the ABC transporter from B. longum is described. A recombinant galacto-N-biose-/lacto-N-biose I-binding protein (GL-BP) from Bifidobacterium longum JCM1217 has been prepared and crystallized by the hanging-drop vapour-diffusion method using 10 mg ml{sup −1} purified enzyme, 0.01 M zinc sulfate, 0.1 M MES buffer pH 5.9–6.4 and 20–22%(v/v) PEG MME 550 in the presence of 5 mM disaccharide ligands. Suitable crystals grew after 10 d incubation at 293 K. The crystals belong to space group C222{sub 1}, with unit-cell parameters a = 106.3, b = 143.6, c = 114.6 Å for the lacto-N-biose I complex and a = 106.4, b = 143.4, c = 115.5 Å for the galacto-N-biose complex, and diffracted to 1.85 and 1.99 Å resolution, respectively.

  13. 三种剂量630nm弱激光对Wistar大鼠背部皮肤开放型创伤愈合的作用观察%Effects of Low-Level Laser Therapy at 630 Nanometer on Cutaneous Excisional Wound Healings of Wistar Rats with Three Doses Between 1~4 J/cm2

    Institute of Scientific and Technical Information of China (English)

    潘振华; 王兴; 陈洪丽; 肖全芝; 李迎新

    2009-01-01

    目的:从创伤面积收缩率和组织病理学角度观察630nm连续输出型弱激光,在功率密度一定(10mW/cm 2)时,每日创面照射剂量分别为1.2J/cm 2、2.4J/cm 2和3.6J/cm 2对Wistar大鼠背部皮肤开放型创伤愈合的影响.方法:用手术剪在每只Wistar大鼠背部造四个圆形、全层皮肤切除的创口,按照完全随机设计,将同一只大鼠背部的四个创口划分到空白对照组和三个不同剂量照射组,造创半小时后照射,连续照7天;再将大鼠随机分为1~6组,依次在造创后的第12、24、48、72、120和168小时处死取材,进行HE染色,光镜下评价;对第5、6组的样本增加马松(Masson)特染,光镜下评价;并对第6组在每次照射前用无菌薄膜沿边缘描记一次创面,采用ImageJ图像处理软件计算创口面积,对数据进行方差分析.结果:创伤面积的方差分析结果表明,空白对照组与各照射组之间不存在统计学差异;而组织病理学观察结果表明,弱激光照射组较空白对照组有以下特点:炎性期持续时间短,肉芽组织出现早,在同一时期,肉芽组织成熟、胶原数量多且其中成熟胶原所占比重大、表皮新生速度快,并且,这种优势随着所用剂量的增加而更加明显.结论:功率密度为10mW/cm 2,剂量分别为1.2J/cm 2、2.4J/cm 2和3.6J/cm 2的630nm弱激光照射能够产生创伤部位局部效应,促进Wistar大鼠背部皮肤开放型创伤的愈合过程,并且随着剂量的增加,创伤愈合效果越好.

  14. Draft Genome Sequences of Three Alkaliphilic Bacillus Strains, Bacillus wakoensis JCM 9140T, Bacillus akibai JCM 9157T, and Bacillus hemicellulosilyticus JCM 9152T

    OpenAIRE

    Yuki, Masahiro; Oshima, Kenshiro; Suda, Wataru; OSHIDA, Yumi; Kitamura, Keiko; Iida, Toshiya; Hattori, Masahira; Ohkuma, Moriya

    2014-01-01

    Here, we report the draft genome sequences of the type strains of three cellulolytic or hemicellulolytic alkaliphilic Bacillus species: Bacillus wakoensis, Bacillus akibai, and Bacillus hemicellulosilyticus. The genome information for these three strains will be useful for studies of alkaliphilic Bacillus species, their evolution, and biotechnological applications for their enzymes.

  15. Dynamical Properties of Scaled Atomic Wehrl Entropy of Multiphoton JCM in the Presence of Atomic Damping

    Directory of Open Access Journals (Sweden)

    S. Abdel-Khalek

    2013-01-01

    Full Text Available We study the dynamics of the atomic inversion, scaled atomic Wehrl entropy, and marginal atomic Q-function for a single two-level atom interacting with a one-mode cavity field taking in the presence of atomic damping. We obtain the exact solution of the master equation in the interaction picture using specific initial conditions. We examine the effects of atomic damping parameter and number of multiphoton transition on the scaled atomic Wehrl entropy, atomic Q-function, and their marginal distribution. We observe an interesting monotonic relation between the different physical quantities in the case of different values of the number of photon transition during the time evolution.

  16. Modeling Army Applicants’ Job Choices: The Enlisted Personnel Allocation System (EPAS) Simulation Job Choice Model (JCM)

    Science.gov (United States)

    2006-11-01

    http://roso.epfl.ch/biogeme. Greene, W.H. (1990). Econometric analysis. New York: Macmillan Publishing. Hogan, P.F., Esponisa, J., Mackin, P.C...P. Zarembka (Ed.), Frontiers in Econometrics. New York: Academic Press. Simon, H.A. (1955). A behavioral model of rational choice. Quarterly Journal...Diff Ratio Family (E) (A) (A-E) (E/A) Catl -3A CL 2434 0.1070 0.1048 -0.0021 1.0204 CO 2148 0.3512 0.3605 0.0093 0.9741 EL 2256 0.1207 0.1213 0.0006

  17. Inactivation of mycobacterium smegmatis following exposure to 405-nanometer light from a supraluminous diode array.

    Science.gov (United States)

    Guffey, J Stephen; Payne, William; James, Leslie

    2013-05-01

    To determine the potential for blue light (405 nm) to produce a bactericidal effect on Mycobacterium smegmatis. Additionally, the study sought to evaluate a series of doses in terms of their respective bactericidal capabilities. The effect of blue light on Staphylococcus aureus has been studied and it was found that a bactericidal outcome can be obtained with low doses of blue light. M. smegmatis was tested because of the recent appearance of the Mycobacterium family of organisms as a public health threat among persons receiving tattoos. The organism was treated in vitro with 405 nm light emitted from a supraluminous diode (SLD) array. Doses of 60 Jcm-2, 90 Jcm-2, 120 Jcm-2, 150 Jcm-2, 180 Jcm-2, 215 Jcm-2, and 250 Jcm-2 were used. Colony counts were performed and compared to untreated controls using Student t tests and one-way ANOVA with Tukey post hoc analysis. The results revealed statistically significant bactericidal effects of the blue light on M. smegmatis (F6, 28 = 50.518, P = 0.000). The treatment reduced the number of bacterial colonies at all doses, but 60 Jcm-2 did not produce a statistically significant kill rate. All other doses produced a significant kill rate with 120 Jcm-2, 150 Jcm-2, and 215 Jcm-2, demonstrating the most effective kill rates of 98.3%, 96.7%, and 100%, respectively. Appropriate doses of 405 nm light from an SLD array can kill M. smegmatis in vitro. A dose of at least 100 Jcm-2 dose is needed for the most effective inactivation of the organism. The dose response for this organism to blue light is not linear. Some degree of effectiveness is lost at 180 Jcm-2 and 250 Jcm-2. .

  18. Bacteroides sartorii is an earlier heterotypic synonym of Bacteroides chinchillae and has priority.

    Science.gov (United States)

    Sakamoto, Mitsuo; Ohkuma, Moriya

    2012-06-01

    Strains of the recently proposed species Bacteroides chinchillae share more than 99.4 % 16S rRNA gene sequence similarity with the type strain of Bacteroides sartorii although these two species do not appear to be similar from their published descriptions. The aim of this study was to perform phenotypic and genetic analyses of both species to clarify their taxonomic position. B. chinchillae JCM 16497(T) exhibited high hsp60 gene sequence similarity with B. sartorii JCM 17136(T) (100 %) as well as B. chinchillae JCM 16498 (100 %). The hsp60 gene sequence analysis and levels of DNA-DNA relatedness observed demonstrated B. sartorii JCM 17136(T), B. chinchillae JCM 16497(T), and B. chinchillae JCM 16498 are members of a single species. Based on these data, we propose Bacteroides chinchillae as a later heterotypic synonym of Bacteroides sartorii. An emended description of B. sartorii is provided.

  19. Sporobolomyces koalae sp. nov., a basidiomycetous yeast isolated from nasal smears of Queensland koalas kept in a Japanese zoological park.

    Science.gov (United States)

    Satoh, Kazuo; Makimura, Koichi

    2008-12-01

    Three strains (JCM 15063(T), JCM 15098 and JCM 15099) of a novel basidiomycetous yeast species belonging to the genus Sporobolomyces were isolated from nasal smears of Queensland koalas kept in a Japanese zoological park. Analyses of sequences of the nuclear rDNA internal transcribed spacer region and the 26S rDNA D1/D2 domain and morphological studies indicated that these strains represent a novel species with a close phylogenetic relationship to Sporobolomyces carnicolor and Sporobolomyces japonicus in the Sporidiobolus lineage, for which the name Sporobolomyces koalae sp. nov. is proposed (type strain JCM 15063(T) =CBS 10914(T) =DSM 19992(T)).

  20. The influence of low-level laser therapy on parameters of oxidative stress and DNA damage on muscle and plasma in rats with heart failure.

    Science.gov (United States)

    Biasibetti, Micheli; Rojas, Denise B; Hentschke, Vítor S; Moura, Dinara Jaqueline; Karsten, Marlus; Wannmacher, Clóvis M D; Saffi, Jenifer; Dal Lago, Pedro

    2014-11-01

    In heart failure (HF), there is an imbalance between the production of reactive oxygen species and the synthesis of antioxidant enzymes, causing damage to the cardiovascular function and increased susceptibility to DNA damage. The aim of this study was to evaluate the influence of low-level laser therapy (LLLT) on parameters of oxidative stress and DNA damage in skeletal muscle and plasma of rats with HF. Wistar rats were allocated into six groups: "placebo" HF rats (P-HF, n = 9), "placebo" Sham rats (P-sham, n = 8), HF rats at a dose 3 J/cm(2) of LLLT (3 J/cm(2)-HF, n = 8), sham rats at a dose 3 J/cm(2) of LLLT (3 J/cm(2)-sham, n = 8), HF rats at a dose 21 J/cm(2) of LLLT (21 J/cm(2)-HF, n = 8) and sham rats at a dose 21 J/cm(2) of LLLT (21 J/cm(2)-sham, n = 8). Animals were submitted to a LLLT protocol for 10 days at the right gastrocnemius muscle. Comparison between groups showed a significant reduction in superoxide dismutase (SOD) activity in the 3 J/cm(2)-HF group (p = 0.03) and the 21 J/cm(2)-HF group (p = 0.01) compared to the P-HF group. 2',7'-Dihydrodichlorofluorescein (DCFH) oxidation levels showed a decrease when comparing 3 J/cm(2)-sham to P-sham (p = 0.02). The DNA damage index had a significant increase either in 21 J/cm(2)-HF or 21 J/cm(2)-sham in comparison to P-HF (p = 0.004) and P-sham (p = 0.001) and to 3 J/cm(2)-HF (p = 0.007) and 3 J/cm(2)-sham (p = 0.037), respectively. Based on this, laser therapy appears to reduce SOD activity and DCFH oxidation levels, changing the oxidative balance in the skeletal muscle of HF rats. Otherwise, high doses of LLLT seem to increase DNA damage.

  1. Processing of C60 thin films by Matrix-Assisted Pulsed Laser Evaporation (MAPLE)

    DEFF Research Database (Denmark)

    Canulescu, Stela; Schou, Jørgen; Fæster, Søren

    2011-01-01

    Thin films of fullerenes (C60) were deposited onto silicon using matrix-assisted pulsed laser evaporation (MAPLE). The deposition was carried out from a frozen homogeneous dilute solution of C60 in anisole (0.67 wt%), and over a broad range of laser fluences, from 0.15 J/cm2 up to 3.9 J/cm2. MAPLE...

  2. Five novel Wickerhamomyces- and Metschnikowia-related yeast species, Wickerhamomyces chaumierensis sp. nov., Candida pseudoflosculorum sp. nov., Candida danieliae sp. nov., Candida robnettiae sp. nov. and Candida eppingiae sp. nov., isolated from plants

    NARCIS (Netherlands)

    Groenewald, Marizeth; Robert, Vincent; Smith, Maudy Th

    2011-01-01

    On the basis of nucleotide divergences in the D1/D2 domain of the 26S rRNA gene and the internal transcribed spacers (ITS) domain of the rRNA gene, five novel yeast species, Wickerhamomyces chaumierensis sp. nov. (CBS 8565(T)  = JCM 17246(T)), Candida pseudoflosculorum sp. nov. (CBS 8584(T)  = JCM 1

  3. Five novel Wickerhamomyces- and Metschnikowia-related yeast species, Wickerhamomyces chaumierensis sp. nov., Candida pseudoflosculorum sp. nov., Candida danieliae sp. nov., Candida robnettiae sp. nov. and Candida eppingiae sp. nov., isolated from plants

    NARCIS (Netherlands)

    Groenewald, Marizeth; Robert, Vincent; Smith, Maudy Th

    On the basis of nucleotide divergences in the D1/D2 domain of the 26S rRNA gene and the internal transcribed spacers (ITS) domain of the rRNA gene, five novel yeast species, Wickerhamomyces chaumierensis sp. nov. (CBS 8565(T)  = JCM 17246(T)), Candida pseudoflosculorum sp. nov. (CBS 8584(T)  = JCM

  4. First report of seed-borne cherry leaf roll virus in wild potato, Solanum acaule, from South America

    Science.gov (United States)

    A virus, designated JCM-79, was isolated from wild potato (Solanum acaule Bitt.) plants grown from true seed received at USDA-APHIS Potato Quarantine Program from Peru. JCM-79 was mechanically transmissible to Nicotiana clevelandii, N.tabacum cv. Samsun NN, and Chenopodium quinoa. Symptoms in the ...

  5. NCBI nr-aa BLAST: CBRC-DNOV-01-1664 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-DNOV-01-1664 ref|YP_001055895.1| major facilitator superfamily MFS_1 [Pyrobaculum calidifont...is JCM 11548] gb|ABO08429.1| major facilitator superfamily MFS_1 [Pyrobaculum calidifontis JCM 11548] YP_001055895.1 0.12 29% ...

  6. NCBI nr-aa BLAST: CBRC-DNOV-01-0465 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-DNOV-01-0465 ref|YP_001055895.1| major facilitator superfamily MFS_1 [Pyrobaculum calidifont...is JCM 11548] gb|ABO08429.1| major facilitator superfamily MFS_1 [Pyrobaculum calidifontis JCM 11548] YP_001055895.1 0.25 31% ...

  7. Experimental study on He- Ne laser irradiation to inhibit scar fibroblast growth in culture

    Institute of Scientific and Technical Information of China (English)

    舒彬; 吴宗耀; 郝林林; 曾登芬; 冯光锐; 林永辉

    2002-01-01

    To explore the inhibitory effect of He-Ne laser irradiation on fibroblast growth of hypertrophic scars in culture. Methods: He-Ne laser with wavelength of 632.8 nm,power density of 50 mW/cm2 and doses of 3 J/cm2,30 J/cm2, 90 J/cm2 and 180 J/cm2 was used to irradiate human scar fibroblasts in culture 1, 3 and 5 times respectively, and then the cell count and cell cycle analysis were done. Results: Repeated irradiation with He-Ne laser at dose of 180 J/cm2 three and five times led to an evident decrease in total cell number compared with that of the control group and there was a significant difference ( P <0.05). The cell cycle analysis showed after three and five times of irradiation with 180 J/cm2 He-Ne laser the cell number in S-phase decreased from 51% to 20% and 14% respectively, the cell number in G0/G1 phase increased from 28% to 55% and 60% respectively, and the cell percentage in Sub-G1 phase was 6.7% and 9.8% respectively. Conclusions: Repeated irradiation with 180 J/cm2 He-Ne laser can inhibit scar fibroblasts growth in culture.It may be that He-Ne laser irradiation causes cell stagnation in G0/G1 phase and apoptosis.

  8. Different doses of low-level laser irradiation modulate the in vitro response of osteoblast-like cells

    Science.gov (United States)

    Incerti Parenti, Serena; Checchi, Luigi; Fini, Milena; Tschon, Matilde

    2014-10-01

    Because osteoblasts play a key role in bone remodeling and the influence of low-level laser therapy on this process is not clear, Saos-2 human osteoblast-like cells were irradiated by a gallium-aluminum-arsenide diode laser (915 nm) for 10, 48, 96, 193, and 482 s using doses 1, 5, 10, 20, and 50 J/cm2, respectively. A control group was not irradiated. Morphology, viability, and cytotoxicity analyses were carried out after 1 hr, 1 day, and 3 days. Deoxyribose nucleic acid (DNA) content and release of vascular endothelial growth factor (VEGF), receptor activator of nuclear factor kappa B ligand (RANKL), and osteoprotegerin (OPG) were evaluated. Viability was modulated by laser irradiation in a dose-dependent manner, with 10 J/cm2 inducing a biostimulatory response and 20 to 50 J/cm2 determining a bioinhibitory and cytotoxic effect. Accordingly, DNA content was generally increased for the 10 J/cm2 dose and decreased for the 50 J/cm2 dose. A rapid and transitory trend toward increased RANKL/OPG ratio and a tendency toward a delayed increase in VEGF release for doses of 1 to 10 J/cm2 was found. Further investigations using the biostimulatory dose of 10 J/cm2 emerged from this study are needed to establish the ideal treatment regimens in the laboratory as well as in clinical practice.

  9. Improved growth and viability of lactobacilli in the presence of Bacillus subtilis (natto), catalase, or subtilisin.

    Science.gov (United States)

    Hosoi, T; Ametani, A; Kiuchi, K; Kaminogawa, S

    2000-10-01

    In an effort to demonstrate the potential usefulness of Bacillus subtilis (natto) as a probiotic, we examined the effect of this organism on the growth of three strains of lactobacilli co-cultured aerobically in vitro. Addition of B. subtilis (natto) to the culture medium resulted in an increase in the number of viable cells of all lactobacilli tested. Since B. subtilis (natto) can produce catalase, which has been reported to exhibit a similar growth-promoting effect on lactobacilli, we also examined the effect of bovine catalase on the growth of Lactobacillus reuteri JCM 1112 and L. acidophilus JCM 1132. Both catalase and B. subtilis (natto) enhanced the growth of L. reuteri JCM 1112, whereas B. subtilis (natto) but not catalase enhanced the growth of L. acidophilus JCM 1132. In a medium containing 0.1 mM hydrogen peroxide, its toxic effect on L. reuteri JCM 1112 was abolished by catalase or B. subtilis (natto). In addition, a serine protease from B. licheniformis, subtilisin, improved the growth and viability of L. reuteri JCM 1112 and L. acidophilus JCM 1132 in the absence of hydrogen peroxide. These results indicate that B. subtilis (natto) enhances the growth and (or) viability of lactobacilli, possibly through production of catalase and subtilisin.

  10. Joint modeling and registration of cell populations in cohorts of high-dimensional flow cytometric data.

    Science.gov (United States)

    Pyne, Saumyadipta; Lee, Sharon X; Wang, Kui; Irish, Jonathan; Tamayo, Pablo; Nazaire, Marc-Danie; Duong, Tarn; Ng, Shu-Kay; Hafler, David; Levy, Ronald; Nolan, Garry P; Mesirov, Jill; McLachlan, Geoffrey J

    2014-01-01

    In biomedical applications, an experimenter encounters different potential sources of variation in data such as individual samples, multiple experimental conditions, and multivariate responses of a panel of markers such as from a signaling network. In multiparametric cytometry, which is often used for analyzing patient samples, such issues are critical. While computational methods can identify cell populations in individual samples, without the ability to automatically match them across samples, it is difficult to compare and characterize the populations in typical experiments, such as those responding to various stimulations or distinctive of particular patients or time-points, especially when there are many samples. Joint Clustering and Matching (JCM) is a multi-level framework for simultaneous modeling and registration of populations across a cohort. JCM models every population with a robust multivariate probability distribution. Simultaneously, JCM fits a random-effects model to construct an overall batch template--used for registering populations across samples, and classifying new samples. By tackling systems-level variation, JCM supports practical biomedical applications involving large cohorts. Software for fitting the JCM models have been implemented in an R package EMMIX-JCM, available from http://www.maths.uq.edu.au/~gjm/mix_soft/EMMIX-JCM/.

  11. PERFORMANCE OF LAYER HEN FED FERMENTED Jatropha Curcas L. MEAL SUPPLEMENTED WITH CELLULASE AND PHYTASE ENZYME

    Directory of Open Access Journals (Sweden)

    S. Sumiati

    2014-10-01

    Full Text Available The objective of the experiment was to study the effect of feeding fermented Jatropha curcas L.meal (JCM supplemented with cellulase and phytase on the performances of ISA-Brown laying henaged 25-30 weeks. The Jatropha curcas meal was fermented using Rizhopus oligosporus. In this study200 laying hens were used and distributed to 5 treatments and 4 replications in Completely RandomizedDesign. The diet treatments were: R0 = control diet (without JCM, R1; diet contained fermented JCM7.5%, R2; diet contained fermented JCM 7.5% + celullase 200 g/ton, R3; diet contained fermented JCM7.5% + phytase 200 g/ton and R4; diet contained fermented JCM 7.5% + cellulase 200 g/ton + phytase200 g/ton. The parameters observed were feed consumption, hen day egg production, egg massproduction, egg weight and feed conversion ratio. The results showed that feeding fermented JCM 7.5%,both enzyme supplemented as well as unsupplemented significantly decreased (P<0.05 the feedconsumption, hen day egg and egg mass production. However, the treatments did not influence the eggweight. Supplementation of cellulase (R2 or phytase (R3 improved the feed conversion ratio with thevalue as same as the R0 diet.

  12. Response of pigmented porcine skin (Sus scrofa domestica) to single 3.8-micron laser radiation pulses

    Science.gov (United States)

    Bostick, Anthony C.; Johnson, Thomas E.; Randolph, Donald Q.; Winston, Golda C. H.

    2005-04-01

    Background and purpose: The purpose of this study is to determine the impact of melanin on skin response to single 3.8 micron, eight microsecond laser pulses and the difference in lesion formation thresholds for input into laser safety standards. Williams et al., performed a study examining laser tissue interaction from 3.8-micron lasers in lightly pigmented Yorkshire pigs (Sus scrofa domestica). However, studies performed by Eggleston et al comparing pigmented and lightly pigmented skin with human skin found that the Yucatan mini-pig is a superior model for laser skin exposures. Methods: Five Yucatan mini-pigs under general anesthesia were exposed to 3.8 micron laser pulses ranging from 0.8 J/cm2 to 93 J/cm2. Gross examinations were done acutely and 24 hours after laser exposure. Skin biopsies were then collected at various times post exposure, and histologic examinations were conducted. Results: The 24 hour ED50 was determined to be 4.5 J/cm2 with fiducial limits of 6.2 and 2.2 J/cm2. As deposited energy was increased, the lesion presentation ranged from whitening of the epidermis (4 J/cm2) to whitening with inflammatory centers (14 J/cm2), and at the highest energy levels inflammatory areas were replaced with an epidermal ulcerated central area (>21 J/cm2). Conclusion: Preliminary findings suggest pigmentation or melanin may play a minor role in the mechanism of laser-tissue damage. The ED50 of Yorkshire pigs was 2.6 J/cm2. The ED50 of the Yucatan mini-pig was found to be 3.6 J/cm2, and although it was higher, it is still within the 95% fiducial limits.

  13. Two-Photon Jaynes-Cummings Model Governed by Milburn Equation with Phase Damping

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    In this paper, we find an analytic solution of the master equation of a non-resonant two-photon JaynesCummings model (JCM) with phase damping with the help of the super-operator technique. We study the influence of phase damping on non-classical effects in the JCM, such as oscillations of the photon-number distribution, revivals of the atomic inversion, and sub-Possion photon statistics. It is demonstrated that the phase damping suppresses the revivals of the atomic inversion and non-classical effects of the cavity field in the JCM.

  14. Ablation from metals induced by visible and UV laser irradiation

    DEFF Research Database (Denmark)

    Svendsen, Winnie Edith; Schou, Jørgen; Thestrup Nielsen, Birgitte

    1996-01-01

    The deposition rate of laser-ablated silver has been determined for fluences between 0.5 and 15 J/cm2 at the wavelengths 532 and 355 nm for a beam spot area of around 0.01 cm2. The ablated metal was collected on a quartz crystal microbalance. The rate at 5 J/cm2 was about 4 × 1013 Ag/cm2 per puls...

  15. Photobiomodulation by helium neon and diode lasers in an excisional wound model: A single blinded trial

    Directory of Open Access Journals (Sweden)

    Snehil Dixit

    2012-01-01

    Full Text Available Background: Application of different kinds of lasers in clinical and experimental studies causes photobiomodulation that works at localized cellular and humoral level on various biological systems. Increased numbers of fibroblasts, myofibroblast, and degranulation of mast cells have been the observed benefits post-irradiation. Objective: Was to find out the effect of irradiation with energy densities of 3.38 J/cm 2 , 8 J/cm 2 , and 18 J/cm 2 on animal tissue (albino wistar rats in an excisional wound model and to assess changes in biochemical (hydroxyproline and histopathological levels in excisional wound model. Materials and Methods: The animals were divided into 4 groups, which were labeled as L1, diode laser (18 J/cm 2 , L2 Helium-neon (He-Ne, 8 J/cm 2 , L3 diode laser (3.38 J/cm 2 , and sham treatment for control was depicted by C, respectively. Histological and hydroxyproline analysis was performed on 7, 14, 21 days of post-wounding. One-way analysis of variance, ANOVA and Bonferroni′s multiple comparison tests were done for tissue hydroxyproline levels. Results: There was no significant increase in the hydroxyproline content (P < 0.005 when observed in study group and compared to controls. Whereas significant epithelizations was seen in group treated with He-Ne laser of intensity of 8 J/cm 2 . Conclusion: The experimental observations suggest that low intensity helium-neon laser of 8 J/cm 2 intensity facilitated photo stimulation by tissue repair, but failed to show significant tissue hydroxyproline levels in excisional wound model.

  16. Vibrio japonicus sp. nov., a novel member of the Nereis clade in the genus Vibrio isolated from the coast of Japan

    Science.gov (United States)

    2017-01-01

    A novel Vibrio strain, JCM 31412T, was isolated from seawater collected from the Inland Sea (Setonaikai), Japan, and characterized as a Gram-negative, oxidase-positive, catalase-negative, facultatively anaerobic, motile, ovoid-shaped bacterium with one polar flagellum. Based on 16S rDNA gene identity, strain JCM 31412T showed a close relationship with type strains of Vibrio brasiliensis (LMG 20546T, 98.2% identity), V. harveyi (NBRC 15634T, 98.2%), V. caribbeanicus (ATCC BAA-2122T, 97.8%) and V. proteolyticus (NBRC 13287T, 97.8%). The G+C content of strain JCM 31412T DNA was 46.8%. Multi-locus sequence analysis (MLSA) of eight loci (ftsZ, gapA, gyrB, mreB, pyrH, recA, rpoA and topA; 5535bp) further clustered strain JCM 31412T in the Nereis clade, genus Vibrio. Phenotypically, strain JCM 31412T differed from the closest related Vibrio species in its utilization of melibiose and raffinose, and its lack of casein and gelatin hydrolysis. It was further differentiated based on its fatty acid composition, specifically properties of C12:03OH and summed features, which were significantly different from those of V. brasiliensis, V. nigripulchritudo and V. caribbeanicus type strains. Overall, the results of DNA-DNA hybridization, and physiological and biochemical analysis differentiated strain JCM 31412T from other described species of the genus Vibrio. Based on these polyphasic taxonomic findings, it was therefore concluded that JCM 31412T was a novel Vibrio species, for which the name Vibrio japonicus sp. nov. was proposed, with JCM 31412T (= LMG 29636T = ATCC TSD-62T) as the type strain. PMID:28231272

  17. PEMANFAATAN BUNGKIL BIJI JARAK PAGAR (JATROPHA CURCAS TERFERMENTASI SEBAGAI PAKAN AYAM KAMPUNG

    Directory of Open Access Journals (Sweden)

    Sumiati

    2010-08-01

    Full Text Available Jatropha curcas meal (JCM is very potential as protein source for poultry. The JCM contained high crude protein, i.e. 56,4-63,8% (without hull and 22,39-31,41% (hulled JCM. JCM serves as a highly nutritious and economic protein supplement in animal feed, if the toxins and antinutrients contained in the JCM are removed. The toxic compounds isolated from jatropha seed include curcin, phorbolesters, and the antinutrients include antitrypsins, tannin, saponin, phytic acid, and high fiber. The objective of this research was to evaluate the effect of feeding fermented JCM on the performances of kampong chickens. In this study, tempeh fungi (fungi using in fermenting soybean used to ferment the JCM. Two hundred kampung chickens were used in this experiment and reared from day old up to 10 weeks of age. The data analyzed with a Completely Randomized Design with 5 treatment diets and 4 replications, with 10 birds in each replicate. The experimental diets were: T0 (the control diet, without Jatropha curcas meal, T1 (the diet contained 5% untreated Jatropha curcas meal, T2 (the diet contained 5% fermented Jatropha curcas meal + cellulase 200 ml/ton of feed, T3 (the diet contained 5% fermented Jatropha curcas meal + 1000 FTU phytase, and T4 (the diet contained 5% fermented Jatropha curcas meal + cellulase 200 ml/ton + 1000 FTU phytase. The results showed that there were no significant difference on the parameters observed due to the treatments. Feeding fermented Jatropha curcas meal supplemented with cellulase + phytase(T4 yielded the final body weight and feed conversion ratio similar to those the control (T0 diet. There was no mortality observed in all treatments. Using JCM 5% in the diet is safe for the kampong chickens

  18. Comparative effects of two different doses of low-level laser therapy on wound healing third-degree burns in rats.

    Science.gov (United States)

    Brassolatti, Patricia; Bossini, Paulo Sérgio; Oliveira, Maria Carolina Derêncio; Kido, Hueliton Wilian; Tim, Carla Roberta; Almeida-Lopes, Luciana; De Avó, Lucimar Retto Da Silva; Araújo-Moreira, Fernando M; Parizotto, Nivaldo Antonio

    2016-04-01

    Burns are injuries caused by direct or indirect contact to chemical, physical, or biological agents. Low-level laser therapy (LLLT) is a promising treatment since it is low-cost, non-invasive, and induces cell proliferation. This study aimed to investigate the effects of LLLT (660 nm) at two different fluences (12.5 J/cm(2) and 25 J/cm(2) ) per point of application on third-degree burns in rats. Thirty rats (Wistar) divided into GC, GL12.5, and GL25 were used in the study, and submitted to burn injury through a soldering iron at 150°C, pressed on their back for 10 s. LLLT was applied immediately, and 2, 4, 6, and 8 days after wound induction. Histological analysis revealed a decreased inflammatory infiltrate in the group treated with 25 J/cm(2) , and intense inflammatory infiltrate in the control group and in the group treated with 12.5 J/cm(2) . The immunostaining of COX-2 was more intense in the control groups and in the group treated with 12.5 J/cm(2) than in the group treated with 25 J/cm(2) . Conversely, VEGF immunomarking was more expressive in the group treated with 25 J/cm(2) than it was in the other two groups. Therefore, our findings suggest that the use of 25 J/cm(2) and 1 J of energy was more effective in stimulating the cellular processes involved in tissue repair on third-degree burns in rats by reducing the inflammatory phase, and stimulating angiogenesis, thus restoring the local microcirculation which is essential for cell migration.

  19. Safety of cornea and iris in ocular surgery with 355-nm lasers.

    Science.gov (United States)

    Wang, Jenny; Chung, Jae Lim; Schuele, Georg; Vankov, Alexander; Dalal, Roopa; Wiltberger, Michael; Palanker, Daniel

    2015-09-01

    A recent study showed that 355-nm nanosecond lasers cut cornea with similar precision to infrared femtosecond lasers. However, use of ultraviolet wavelength requires precise assessment of ocular safety to determine the range of possible ophthalmic applications. In this study, the 355-nm nanosecond laser was evaluated for corneal and iris damage in rabbit, porcine, and human donor eyes as determined by minimum visible lesion (MVL) observation, live/dead staining of the endothelium, and apoptosis assay. Single-pulse damage to the iris was evaluated on porcine eyes using live/dead staining. In live rabbits, the cumulative median effective dose (ED50) for corneal damage was 231 J/cm2, as seen by lesion observation. Appearance of endothelial damage in live/dead staining or apoptosis occurred at higher radiant exposure of 287 J/cm2. On enucleated rabbit and porcine corneas, ED50 was 87 and 52 J/cm2, respectively, by MVL, and 241 and 160 J/cm2 for endothelial damage. In human eyes, ED50 for MVL was 110 J/cm2 and endothelial damage at 453 J/cm2. Single-pulse iris damage occurred at ED 50 of 208 mJ/cm2. These values determine the energy permitted for surgical patterns and can guide development of ophthalmic laser systems. Lower damage threshold in corneas of enucleated eyes versus live rabbits is noted for future safety evaluation.

  20. Influence of different energy densities of laser phototherapy on oral wound healing

    Science.gov (United States)

    Wagner, Vivian Petersen; Meurer, Luise; Martins, Marco Antonio Trevizani; Danilevicz, Chris Krebs; Magnusson, Alessandra Selinger; Marques, Márcia Martins; Filho, Manoel Sant'Ana; Squarize, Cristiane Helena; Martins, Manoela Domingues

    2013-12-01

    The aim of the present prospective study was to evaluate the impact of laser phototherapy (LPT) on the healing of oral ulcers. Different power densities were used on oral wounds in Wistar rats (n=72) randomly divided into three groups: control (0 J/cm2), 4 J/cm2 laser, and 20 J/cm2 laser. Ulcers (3 mm in diameter) were made on the dorsum of the tongue with a punch. Irradiation with an indium-gallium-aluminum-phosphide laser (660 nm output power: 40 mW spot size: 0.04 cm) was performed once a day in close contact with the ulcer for 14 consecutive days. A statistically significant acceleration in healing time was found with wounds treated with 4 J/cm2 LPT. Moreover, striking differences were found in the ulcer area, healing percentage, degree of reepithelialization, and collagen deposition. The most significant changes occurred after 5 days of irradiation. Based on the conditions employed in the present study, LPT is capable of accelerating the oral mucosa wound-healing process. Moreover, faster and more organized reepithelialization and tissue healing of the oral mucosa were achieved with an energy density of 4 J/cm2 in comparison to 20 J/cm2.

  1. Multidiagnostics analysis of ion dynamics in ultrafast laser ablation of metals over a large fluence range

    Energy Technology Data Exchange (ETDEWEB)

    Anoop, K. K.; Polek, M. P.; Bruzzese, R.; Amoruso, S.; Harilal, Sivanandan S.

    2015-02-28

    The ions dynamics in ultrafast laser ablation of metals is studied over a fluence range spanning from the ablation threshold up to ~75 J/cm2 by means of three established diagnostic techniques. Langmuir probe, Faraday cup and spectrally resolved ICCD imaging simultaneously monitor the laser-produced plasma ions produced during ultrafast laser ablation of a copper target. The fluence dependence of ion yield is analyzed observing the occurrence of three different regimes. Moreover, the specific ion yield shows a maximum at about 4-5 J/cm2, followed by a gradual reduction and a transition to a high-fluence regime above ~50 J/cm2. The fluence variation of the copper ions angular distribution is also analyzed, observing a gradual increase of forward peaking of Cu ions for fluences up to ~10 J/cm2. Then, a broader ion component is observed at larger angles for fluences larger than ~10 J/cm2. Finally, an experimental characterization of the ions angular distribution for several metallic targets (Mg, Al, Cr, Fe, Cu, and W) is carried out at a relatively high fluence of ~66 J/cm2. Interestingly, the ion emission from the volatile metals show a narrow forward peaked distribution and a high peak ion yield compared to the refractory metals. Moreover, the width of ion angular distributions presents a striking correlation with the peak ion yield.

  2. Bacterial community analysis of cypermethrin enrichment cultures and bioremediation of cypermethrin contaminated soils.

    Science.gov (United States)

    Akbar, Shamsa; Sultan, Sikander; Kertesz, Michael

    2015-07-01

    Cypermethrin is widely used for insect control; however, its toxicity toward aquatic life requires its complete removal from contaminated areas where the natural degradation ability of microbes can be utilized. Agricultural soil with extensive history of CM application was used to prepare enrichment cultures using cypermethrin as sole carbon source for isolation of cypermethrin degrading bacteria and bacterial community analysis using PCR-DGGE of 16 S rRNA gene. DGGE analysis revealed that dominant members of CM enrichment culture were associated with α-proteobacteria followed by γ-proteobacteria, Firmicutes, and Actinobacteria. Three potential CM-degrading isolates identified as Ochrobactrum anthropi JCm1, Bacillus megaterium JCm2, and Rhodococcus sp. JCm5 degraded 86-100% of CM (100 mg L(-1) ) within 10 days. These isolates were also able to degrade other pyrethroids, carbofuran, and cypermethrin degradation products. Enzyme activity assays revealed that enzymes involved in CM-degradation were inducible and showed activity when strains were grown on cypermethrin. Degradation kinetics of cypermethrin (200 mg kg(-1)) in soils inoculated with isolates JCm1, JCm2, and JCm5 suggested time-dependent disappearance of cypermethrin with rate constants of 0.0516, 0.0425, and 0.0807 d(-1), respectively, following first order rate kinetics. The isolated bacterial strains were among dominant genera selected under CM enriched conditions and represent valuable candidates for in situ bioremediation of contaminated soils and waters.

  3. Bacteroides stercorirosoris sp. nov. and Bacteroides faecichinchillae sp. nov., isolated from chinchilla (Chinchilla lanigera) faeces.

    Science.gov (United States)

    Kitahara, Maki; Sakamoto, Mitsuo; Tsuchida, Sayaka; Kawasumi, Koh; Amao, Hiromi; Benno, Yoshimi; Ohkuma, Moriya

    2012-05-01

    Strains of gram-negative anaerobic rods were isolated from chinchilla (Chinchilla lanigera) faeces, and three strains, ST161(T), ST33 and ST37(T), were investigated taxonomically. Based on phylogenetic analyses and specific phenotypic characteristics, the three strains were allocated to the genus Bacteroides. Phylogenetic analyses of their 16S rRNA gene sequences revealed that strain ST161(T) formed a distinct line of descent, with highest sequence similarity to strain ST33 (98.7 %) and Bacteroides oleiciplenus JCM 16102(T) (97.7 %). High levels of DNA-DNA relatedness (79-89 %) were found between strains ST161(T) and ST33, but low levels were found between strain ST161(T) and B. oleiciplenus JCM 16102(T) (33-37 %) and between strain ST33 and B. oleiciplenus JCM 16102(T) (33-37 %). These data clearly indicated that strains ST161(T) and ST33 represent a single novel species. 16S rRNA gene sequence analyses showed that strain ST37(T) also formed a distinct line of descent, with highest sequence similarity to Bacteroides acidifaciens JCM 10556(T) (96.5 %) and Bacteroides caccae JCM 9498(T) (95.6 %). Analysis of hsp60 gene sequences also supported these relationships. Based on phenotypic and phylogenetic characteristics, two novel species, Bacteroides stercorirosoris sp. nov. and Bacteroides faecichinchillae sp. nov., are thus proposed. The type strains of B. stercorirosoris and B. faecichinchillae are ST161(T) ( = JCM 17103(T) = CCUG 60872(T)) and ST37(T) ( = JCM 17102(T) = CCUG 60873(T)), respectively. The DNA G+C contents of strains ST161(T) and ST37(T) were 45.7 and 41.0 mol%, respectively.

  4. Bacteroides chinchillae sp. nov. and Bacteroides rodentium sp. nov., isolated from chinchilla (Chinchilla lanigera) faeces.

    Science.gov (United States)

    Kitahara, Maki; Tsuchida, Sayaka; Kawasumi, Koh; Amao, Hiromi; Sakamoto, Mitsuo; Benno, Yoshimi; Ohkuma, Moriya

    2011-04-01

    Gram-negative anaerobic rods were isolated from chinchilla (Chinchilla lanigera) faeces and three strains, ST170(T), ST180 and ST28(T), were investigated taxonomically. On the basis of phylogenetic analyses and specific phenotypic characteristics, the three strains belonged to the genus Bacteroides. Phylogenetic analysis of their 16S rRNA gene sequences revealed that strains ST170(T) and ST180 formed a single cluster and a distinct line of descent. Strain ST170(T) exhibited 99.7 % 16S rRNA gene sequence similarity with strain ST180 and 95.1, 94.6 and 94.4 % 16S rRNA gene sequence similarity with Bacteroides massiliensis JCM 13223(T), Bacteroides dorei JCM 13471(T) and Bacteroides vulgatus JCM 5826(T), respectively. Strain ST28(T) also formed a distinct line of descent and exhibited the highest 16S rRNA gene sequence similarity with Bacteroides uniformis JCM 5828(T) (98.1 %). Low DNA-DNA relatedness (1 %) between strain ST28(T) and B. uniformis JCM 5828(T) clearly indicated that they belonged to different species. Analysis of hsp60 sequences also supported these relationships. The DNA G+C contents of strains ST170(T) and ST28(T) were 45.2 and 41.0 mol%, respectively. On the basis of phenotypic characteristics and phylogenetic data, two novel species, Bacteroides chinchillae sp. nov. (type strain ST170(T)  = JCM 16497(T)  = CCUG 59335(T)) and Bacteroides rodentium sp. nov. (type strain ST28(T)  = JCM 16496(T)  = CCUG 59334(T)), are proposed.

  5. Increased viability of odontoblast-like cells subjected to low-level laser irradiation

    Science.gov (United States)

    Oliveira, C. F.; Basso, F. G.; Lins, E. C.; Kurachi, C.; Hebling, J.; Bagnato, V. S.; de Souza Costa, C. A.

    2010-07-01

    Studies have shown that the increase of cell metabolism depends on the low level laser therapy (LLLT) parameters used to irradiate the cells. However, the optimal laser dose to up-regulate pulp cell activity remains unknown. Consequently, the aim of this study was to evaluate the metabolic response of odontoblast-like cells (MDPC-23) exposed to different LLLT doses. Cells at 20000 cells/cm2 were seeded in 24-well plates using plain culture medium (DMEM) and were incubated in a humidified incubator with 5% CO2 at 37°C. After 24 h, the culture medium was replaced by fresh DMEM supplemented with 5% (stress by nutritional deficit) or 10% fetal bovine serum (FBS). The cells were exposed to different laser doses from a near infrared diode laser prototype designed to provide a uniform irradiation of the wells. The experimental groups were: G1: 1.5 J/cm2 + 5% FBS; G2: 1.5 J/cm2 + 10% FBS; G3: 5 J/cm2 + 5% FBS; G4: 5 J/cm2 + 10% FBS; G5: 19 J/cm2 + 5% FBS; G6: 19 J/cm2 + 10% FBS. LLLT was performed in 3 consecutive irradiation cycles with a 24-hour interval. Non-irradiated cells cultured in DMEM supplemented with either 5 or 10% FBS served as control groups. The analysis of the metabolic response was performed by the MTT assay 3 h after the last irradiation. G1 presented an increase in SDH enzyme activity and differed significantly (Mann-Whitney test, p stimulated the metabolic activity of MDPC-23 cultured in DMEM supplemented with 5% FBS and exposed to a laser dose of 1.5 J/cm2. These findings are relevant for further studies on the action of near infrared lasers on cells with odontoblast phenotype.

  6. Low-Level Laser Irradiation Improves Functional Recovery and Nerve Regeneration in Sciatic Nerve Crush Rat Injury Model

    Science.gov (United States)

    Wang, Chau-Zen; Chen, Yi-Jen; Wang, Yan-Hsiung; Yeh, Ming-Long; Huang, Mao-Hsiung; Ho, Mei-Ling; Liang, Jen-I; Chen, Chia-Hsin

    2014-01-01

    The development of noninvasive approaches to facilitate the regeneration of post-traumatic nerve injury is important for clinical rehabilitation. In this study, we investigated the effective dose of noninvasive 808-nm low-level laser therapy (LLLT) on sciatic nerve crush rat injury model. Thirty-six male Sprague Dawley rats were divided into 6 experimental groups: a normal group with or without 808-nm LLLT at 8 J/cm2 and a sciatic nerve crush injury group with or without 808-nm LLLT at 3, 8 or 15 J/cm2. Rats were given consecutive transcutaneous LLLT at the crush site and sacrificed 20 days after the crush injury. Functional assessments of nerve regeneration were analyzed using the sciatic functional index (SFI) and hindlimb range of motion (ROM). Nerve regeneration was investigated by measuring the myelin sheath thickness of the sciatic nerve using transmission electron microscopy (TEM) and by analyzing the expression of growth-associated protein 43 (GAP43) in sciatic nerve using western blot and immunofluorescence staining. We found that sciatic-injured rats that were irradiated with LLLT at both 3 and 8 J/cm2 had significantly improved SFI but that a significant improvement of ROM was only found in rats with LLLT at 8 J/cm2. Furthermore, the myelin sheath thickness and GAP43 expression levels were significantly enhanced in sciatic nerve-crushed rats receiving 808-nm LLLT at 3 and 8 J/cm2. Taken together, these results suggest that 808-nm LLLT at a low energy density (3 J/cm2 and 8 J/cm2) is capable of enhancing sciatic nerve regeneration following a crush injury. PMID:25119457

  7. 脉冲掺钕钇铝石榴石激光对增生性瘢痕成纤维细胞胶原合成的影响%Effects of pulsed Nd:YAG laser on collagen synthesis in hypertrophic scar-derived fibroblast cultures

    Institute of Scientific and Technical Information of China (English)

    舒彬; 郝林林; 袁纯; 唐其敏; 黄显凯; 沈岳; 吴宗耀

    2001-01-01

    目的 探讨脉冲掺钕钇铝石榴石(Nd:YAG)激光对体外培养瘢痕成纤维细胞胶原合成的选择性抑制作用。方法 以不同能量密度(500 J/cm2、1 000 J/cm2、1 500 J/cm2和2 000 J/cm2)Nd:YAG激光(波长1 064 nm,脉宽150 μs)照射体外培养增生性瘢痕和正常皮肤成纤维细胞,照射后24 h分别用3H-脯氨酸掺入法和斑点杂交法检测成纤维细胞胶原合成和I型前胶原基因表达。 结果 体外培养增生性瘢痕成纤维细胞胶原合成高于正常皮肤,约为正常皮肤的2倍,I型前胶原基因表达亦明显高于正常皮肤,约为正常皮肤的3倍;以500 J/cm2激光照射,增生性瘢痕与正常皮肤成纤维细胞胶原合成、I型前胶原mRNA水平均无变化,以1 500 J/cm2、2 000 J/cm2能量密度激光照射,增生性瘢痕成纤维细胞胶原合成、I型前胶原mRNA水平都显著降低(P<0.001,P<0.001);正常皮肤成纤维细胞胶原合成、I型前胶原mRNA水平在1 500 J/cm2激光照射后降低(P<0.001,P<0.01),2 000 J/cm2照射后亦显著降低(P<0.001,P<0.05);以1 000 J/cm2照射,增生性瘢痕成纤维细胞胶原合成与I型前胶原基因表达显著下降(P<0.001),而正常皮肤成纤维细胞胶原合成和I型前胶原基因表达却无明显变化。结论 1 000 J/cm2脉冲Nd:YAG激光照射能选择性抑制增生性瘢痕成纤维细胞胶原合成和I型前胶原基因表达。%Objective In order to explore the selectively inhibitory effects of pulsed Nd:YAG laser irradiation on collagen production of scar fibroblasts in vitro. Methods Cultured fibroblasts derived from hypertrophic scars (HS) and normal human skin were irradiated with a pulsed Nd:YAG laser(wavelength 1 064 nm, pulse width 150(μs) at various energy density levels (500 J/cm2, 1 000 J/cm2, 1 500 J/cm2 and 2 000 J/cm2). At 24 hours after laser irradiation, collagen production of fibroblasts was measured by the incorporation

  8. Bifidobacterium reuteri sp. nov., Bifidobacterium callitrichos sp. nov., Bifidobacterium saguini sp. nov., Bifidobacterium stellenboschense sp. nov. and Bifidobacterium biavatii sp. nov. isolated from faeces of common marmoset (Callithrix jacchus) and red-handed tamarin (Saguinus midas).

    Science.gov (United States)

    Endo, Akihito; Futagawa-Endo, Yuka; Schumann, Peter; Pukall, Rüdiger; Dicks, Leon M T

    2012-03-01

    Five strains of bifidobacteria were isolated from faeces of a common marmoset (Callithrix jacchus) and a red-handed tamarin (Saguinus midas). The five isolates clustered inside the phylogenetic group of the genus Bifidobacterium but did not show high sequence similarities between the isolates and to known species in the genus by phylogenetic analysis based on 16S rRNA gene sequences. Sequence analyses of dnaJ1 and hsp60 also indicated their independent phylogenetic positions to each other in the Bifidobacterium cluster. DNA G+C contents of the species ranged from 57.3 to 66.3 mol%, which is within the values recorded for Bifidobacterium species. All isolates showed fructose-6-phosphate phosphoketolase activity. Based on the data provided, the five isolates represent five novel species, for which the names Bifidobacterium reuteri sp. nov. (type strain: AFB22-1(T) = JCM 17295(T) = DSM 23975(T)), Bifidobacterium callitrichos sp. nov. (type strain: AFB22-5(T) = JCM 17296(T) = DSM 23973(T)), Bifidobacterium saguini sp. nov. (type strain: AFB23-1(T) = JCM 17297(T) = DSM 23967(T)), Bifidobacterium stellenboschense sp. nov. (type strain: AFB23-3(T) = JCM 17298(T) = DSM 23968(T)) and Bifidobacterium biavatii sp. nov. (type strain: AFB23-4(T) = JCM 17299(T) = DSM 23969(T)) are proposed.

  9. Effect of Low-Level Laser therapy on the fungal proliferation of Candida albicans

    Science.gov (United States)

    Carneiro, Vanda S. M.; Araújo, Natália C.; Menezes, Rebeca F. d.; Moreno, Lara M.; Santos-Neto, Alexandrino d. P.; Gerbi, Marleny Elizabeth M.

    2016-03-01

    Candida albicans plays an important role in triggering infections in HIV+ patients. The indiscriminate use of antifungals has led to resistance to Candida albicans, which requires new treatment alternatives for oral candidiasis. Low-level laser therapy promotes a considerable improvement in the healing of wounds and in curing illnesses caused by microorganisms. The aim of the present study was to assess the effect of laser radiation on the cell proliferation of Candida albicans in immunosuppressed patients. Six Candida albicans strains that had been isolated from immunosuppressed patients were divided into a control group and experimental groups, which received eight sessions of laser therapy (InGaAlP, λ685nm, P = 30mW, CW, Φ~6 mm and GaAlAs, λ830nm, P = 40mW, CW, Φ~6 mm) using dosimetries of 6J/cm2, 8J/cm2, 10J/cm2 and 12J/cm2 for each wavelength and power. The results were not statistically significant (Kruskal Wallis, p > 0.05), although the proliferation of Candida albicans was lower in some of the experimental groups. The dosimetry of 6J/cm2 (GaAlAs, λ830nm, P = 40mW) provided lower mean scores than the other groups for the growth of Candida. Further studies are required to confirm whetehr laser therapy is a viable option in the treatment of fungal infections.

  10. Protein oxidation in processed cheese slices treated with pulsed light technology.

    Science.gov (United States)

    Fernández, M; Ganan, M; Guerra, C; Hierro, E

    2014-09-15

    The effect of pulsed light technology on protein oxidation was studied in sliced processed cheese by measuring the protein-bound carbonyls with a spectrophotometric DNPH assay. Bovine serum albumin was also tested as a protein standard. Fluences of 0.7, 2.1, 4.2, 8.4 and 11.9 J/cm(2) were applied to vacuum-packaged cheese slices and to an aqueous solution of the protein. Treatments up to 4.2 J/cm(2) did not promote protein oxidation immediately after flashing either in cheese or in the standard. Samples treated with 8.4 and 11.9 J/cm(2) showed significantly higher carbonyl amounts than non-treated ones. Protein oxidation increased along cheese storage at 4°C, and differences among treatments remained. Further studies on the sensory properties will be needed to clarify the impact of pulsed light on processed cheese quality.

  11. Assessment of anticancer effect of chlorin e6 dimethyl ether for photodynamic therapy

    Directory of Open Access Journals (Sweden)

    M. A. Kaplan

    2014-01-01

    Full Text Available Results of the study for anticancer efficacy of photodynamic therapy with chlorin e6 dimethyl ether for treatment of outbread rats with sarcoma M-1 are represented. The drug was given intravenously or intraperitonealy at a dose of 1.25 mg/kg body weight (light dose – 300 J/cm2 or 2,5 mg/kg body weight (light dose – 150 J/cm2. The spectrometry showed that maximal drug accumulation in tumor was in 2 h after intravenous injection or 3 h after intraperitoneal injection of photosensitizer, thus, sensitized tumors were irradiated according to these time intervals. Intraperitoneal injection of chlorin е6 dimethyl ether at a dose of 1.25 mg/kg body weight with treatment session in 3 h and light dose of 300 J/cm2 was the most effective (the complete response in animals – 86%.

  12. Resistive switching behavior in single crystal SrTiO3 annealed by laser

    Science.gov (United States)

    Pan, Xinqiang; Shuai, Yao; Wu, Chuangui; Luo, Wenbo; Sun, Xiangyu; Yuan, Ye; Zhou, Shengqiang; Ou, Xin; Zhang, Wanli

    2016-12-01

    Single crystal SrTiO3 (STO) wafers were annealed by XeCl laser (λ = 308 nm) with different fluences of 0.4 J/cm2, 0.6 J/cm2 and 0.8 J/cm2, respectively. Ti/Pt electrodes were sputtered on the surface of STO wafer to form co-planar capacitor-like structures of Pt/Ti/STO/Ti/Pt. Current-Voltage measurements show that the leakage current is enhanced by increasing laser fluence. Resistive switching behavior is only observed in the sample annealed by laser with relatively high fluence after an electro-forming process. The X-ray photoelectron spectroscopy measurements indicate that the amount of oxygen vacancies increases with the increase of laser fluence. This work indicates resistive switching appears when enough oxygen vacancies are generated by the laser, which form conductive filaments under an external electric field.

  13. Metal-based phthalocyanines as a potential photosensitizing agent in photodynamic therapy for the treatment of melanoma skin cancer

    Science.gov (United States)

    Maduray, Kaminee; Odhav, B.

    2014-03-01

    Photodynamic therapy (PDT) is an emerging medical treatment that uses photosensitizers (drug) which are activated by laser light for the generation of cytotoxic free radicals and singlet oxygen molecules that cause tumor cell death. In the recent years, there has been a focus on using and improving an industrial colorant termed phthalocyanines as a prospective photosensitizer because of its unique properties. This in vitro study investigated the photodynamic effect of indium (InPcCl) and iron (FePcCl) phthalocyanine chlorides on human skin cancer cells (melanoma). Experimentally, 2 x 104 cells/ml were seeded in 24-well tissue culture plates and allowed to attach overnight, after which cells were treated with different concentrations (2 μg/ml - 100 μg/ml) of InPcCl and FePcCl. After 2 h, cells were irradiated with constant light doses of 2.5 J/cm2, 4.5 J/cm2 and 8.5 J/cm2 delivered from a diode laser. Post-irradiated cells were incubated for 24 h before cell viability was measured using the MTT Assay. At 24 h after PDT, irradiation with a light dose of 2.5 J/cm2 for each photosensitizing concentration of InPcCl and FePcCl produced a significant decrease in cell viability, but when the treatment light dose was further increased to 4.5 J/cm2 and 8.5 J/cm2 the cell survival was less than 55% for photosensitizing concentrations of InPcCl and FePcCl from 4 μg/ml to 100 μg/ml. This PDT study concludes that low concentrations on InPcCl and FePcCl activated with low level light doses can be used for the effective in vitro killing of melanoma cancer cells.

  14. Evaluation of healing of infected cutaneous wounds treated with different energy densities

    Science.gov (United States)

    Santos, Nicole R. S.; Cangussú, Maria C. T.; N. dos Santos, Jean; Pinheiro, Antonio L. B.

    2011-03-01

    We aimed assess the effects of different energy densities of the association of red/IR laser light on the healing of cutaneous wounds infected Staphylococcus aureus. Background: Wound infection is the most common complication on healing wounds and cause both vascular and cellular responses on the tissue. Several therapeutics is used for improving wound healing including the use of different light sources, such as the Laser. Some energy densities present positive photobiological effects on the healing process. Material and Methods: 24 young adult male Wistar rats, under general anesthesia, had their dorsum shaven, cleaned and a 1 x 1cm cutaneous wound created with a scalpel and left without no suturing or dressings. The wounds were infected with Staphylococcus aureus and were randomly divided in 8 subgroups of 3 animals in each: Control, Group 10J/cm2, Group 20J/cm2, and Group 30J/cm2, 7 and 14 days each group. Laser phototherapy was carried out with a diode (λ680nm/790nm, P= 30mW/40mW, CW, Laser, Ø = 3mm, PD=424mW/cm2 and 566mW/cm2, t=11.8/ 8.8 sec, E=0.35J) and started immediately after surgery and repeated at every other day during 7 days. Laser light was applied on 4 points around wounded area. The animals were killed at either 8th or 15th day after contamination. Specimens were taken, routinely cut and processed to wax, stained and underwent histological analysis. The results were statistically analyzed. Results: Both 20 and 30J/cm2 caused intense collagen deposition at the end of the experimental time. But, when 20 J/cm2 was used the fibers were also well organized. Conclusion: Our results indicate that irradiated subjects showed improved wound healing being the 20 J/cm2 the energy the caused better histological response.

  15. Biomodulative effects of polarized light on the healing of cutaneous wounds on nourished and undernourished Wistar rats.

    Science.gov (United States)

    Pinheiro, Antonio Luiz Barbosa; Meireles, Gyselle Cynthia Silva; Carvalho, Carolina Montagn; de Barros Vieira, Alessandro Leonardo; dos Santos, Jean Nunes; Ramalho, Luciana Maria Pedreira

    2006-10-01

    This study aimed to evaluate, by light microcopy, the differences in healing process of cutaneous wounds on nourished or undernourished rats following illumination by polarized light (lambda400-2000 nm) with 20 or 40 J/cm(2). There are some reports in the literature on different effects of polarized light on wound healing. Amongst the factors that interfere with wound healing one is the nutritional status of the subject. Thirty nourished or undernourished Wistar rats had one standardized surgical wound created on the dorsum and were divided into six groups: group 1, control (standard diet); group 2, control (Northeastern Brazilian Basic Diet [DBR]); group 3, standard diet + polarized light (20 J/cm(2)); group 4, standard diet + polarized light (40 J/cm(2)); group 5, DBR + polarized light (20 J/cm(2)); group 6, DBR + polarized light (40 J/cm(2)). The first application of treatment was carried out immediately after wounding and repeated every 24 h during 7 days. The animals were sacrificed, and specimens were taken and routinely processed to wax, cut, and stain with hematoxylin and eosin (H&E) and Sirius Red. These were then analyzed under light microscopy. The analysis included re-epitheliialization, inflammatory infiltrate, and fibroblastic proliferation. Sirius Red-stained slides were used to perform descriptive analysis of collagen. The analysis of the results showed better results in these groups illuminated with 20 J/cm(2). It is concluded that nutritional status influenced the progression of the healing process as well as the quality of the healed tissue, and that the use of polarized light resulted in a positive biomodulatory effect.

  16. Fluence-dependent effects of low-level laser therapy in myofascial trigger spots on modulation of biochemicals associated with pain in a rabbit model.

    Science.gov (United States)

    Hsieh, Yueh-Ling; Hong, Chang-Zern; Chou, Li-Wei; Yang, Shun-An; Yang, Chen-Chia

    2015-01-01

    Evidence strongly supports that low-level laser therapy (LLLT) is an effective physical modality for the treatment of pain associated with myofascial trigger points (MTrP). However, the effect of laser fluence (energy intensity in J/cm(2)) on biochemical regulation related to pain is unclear. To better understand the biochemical mechanisms modulated by high- and low-fluence LLLT at myofascial trigger spots (MTrSs; similar to human MTrPs) in skeletal muscles of rabbits, the levels of β-endorphin (β-ep), substance P (SP), tumor necrosis factor-α (TNF-α), and cyclooxygenase-2 (COX-2) were investigated in this study. New Zealand rabbits (2.5-3.0 kg in weight) were used in this study. High-fluence LLLT (27 J/cm(2)), low-fluence LLLT (4.5 J/cm(2)), or sham operations were applied on MTrSs of biceps femoris of rabbits for five sessions (one session per day). Effects of LLLT at two different fluences on biceps femoris, dorsal root ganglion (DRG), and serum were determined by β-ep, SP, TNF-α, and COX-2 immunoassays. LLLT irradiation with fluences of 4.5 and 27 J/cm(2) at MTrSs can significantly reduce SP level in DRG. LLLT with lower fluence of 4.5 J/cm(2) exerted lower levels of TNF-α and COX-2 expression in laser-treated muscle, but LLLT with higher fluence of 27 J/cm(2) elevated the levels of β-ep in serum, DRG, and muscle. This study demonstrated fluence-dependent biochemical effects of LLLT in an animal model on management of myofascial pain. The findings can contribute to the development of dosage guideline for LLLT for treating MTrP-induced pain.

  17. Efficacy of a single high dose versus multiple low doses of LLLT on wounded skin fibroblasts

    Science.gov (United States)

    Hawkins, Denise H.; Abrahamse, Heidi

    2007-07-01

    Background/purpose: In vivo studies have demonstrated that phototherapy accelerates wound healing in the clinical environment; however the exact mechanism is still not completely understood. The main focus of this study was to use in vitro laboratory results to establish an effective treatment regimen that may be practical and applicable to the clinical environment. This in vitro study aimed to compare the cellular responses of wounded fibroblasts following a single exposure of 5 J/cm2 or multiple exposures of low doses (2.5 J/cm2 or 5 J/cm2) on one day of the week to a single application of a higher dose (16 J/cm2) on day 1 and day 4. Methodology: Cellular responses to Helium-Neon (632.8 nm) laser irradiation were evaluated by measuring changes in cell morphology, cell viability, cell proliferation, membrane integrity and DNA damage. Results: Wounded cells exposed to 5 J/cm2 on day 1 and day 4 showed an increase in cell viability, increase in the release of bFGF, increase in cell density, decrease in ALP enzyme activity and decrease in caspase 3/7 activity indicating a stimulatory effect. Wounded cells exposed to three doses of 5 J/cm2 on day 1 showed a decrease in cell viability and cell proliferation and an increase in LDH cytotoxicity and DNA damage indicating an inhibitory effect. Conclusion: Results indicate that cellular responses are influenced by the combination of dose administered, number of exposures and time between exposures. Single doses administered with sufficient time between exposures is more beneficial to restoring cell function than multiple doses within a short period. Although this work confirms previous reports on the cumulative effect of laser irradiation it provides essential information for the initiation of in vivo clinical studies.

  18. Effects of low-power laser irradiation (LPLI) at different wavelengths and doses on oxidative stress and fibrogenesis parameters in an animal model of wound healing.

    Science.gov (United States)

    Silveira, Paulo Cesar Lock; Silva, Luciano A; Freitas, Tiago P; Latini, Alexandra; Pinho, Ricardo A

    2011-01-01

    Gallium-arsenide (GaAs) and helium-neon (HeNe) lasers are the most commonly used low-energy lasers in physiotherapy for promoting wound healing and pain modulation. The aim of this study was investigate the effect of low-power laser irradiation (LPLI) at different wavelengths and doses on oxidative stress and fibrogenesis parameters in an animal model of wound healing. The animals were randomly divided into five groups (n=6): Controls (skin injured animals without local or systemic treatment), skin injury treated with HeNe 1 J/cm(2) (two seg); skin injury treated with HeNe 3 J/cm(2) (six seg); skin injury treated with GaAs 1 J/cm(2) (three seg); skin injury treated with GaAs 3 J/cm(2) (nine seg). A single circular wound measuring 8 mm in diameter was surgically created on the back of the animal. The rats were irradiated at 2, 12, 24, 48, 72, 96, and 120 h after skin injury. The parameters, namely hydroxyproline content, activities of the antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT), and lipid (TBARS) and protein oxidation (carbonyl groups) measurements were assessed. In addition, wound size regression was also analyzed. The results showed an improvement in the wound healing reflected by the reduction in wound size and increased collagen synthesis. Moreover, a significant reduction in TBARS levels, carbonyl content, and SOD and CAT activities were observed after laser irradiation, particularly with the treatments HeNe laser 1 and 3 J/cm(2) dose and GaAs 3 J/cm(2) dose. The data strongly indicate that LPLI therapy is efficient in accelerating the skin wound healing process after wounding, probably by reducing the inflammatory phase and inducing collagen synthesis.

  19. Low-fluence CO2 laser irradiation: selective epidermal damage to human skin.

    Science.gov (United States)

    Kamat, B R; Tang, S V; Arndt, K A; Stern, R S; Noe, J M; Rosen, S

    1985-09-01

    The interaction of normal human skin with low-fluence CO2 laser irradiation was studied using a three-phase approach. In phase one, freshly excised skin was observed immediately after impact. In phase two, skin irradiated 2 h prior to excision was studied. In phase three, human volunteers were irradiated and biopsied at time zero, 24 h and 48 h. Seventy-five sites were exposed and 60 biopsies were performed. The earliest histologic changes were observed in the 6-10 J/cm2 fluence (radiant exposure) range and these changes included spindle and vacuolar changes in the basal layer of the epidermis. Papillary dermal coagulation was present to a maximum of 0.03 mm. At fluences of 10-25 J/cm2, superficial dermal necrosis (0.06-0.08 mm) was observed. At fluences above 25 J/cm2, transepidermal necrosis was present with increasing papillary dermal necrosis that was in proportion to the energy density delivered. At 2h, basal vacuolar changes were accompanied by diffuse keratinocytic cell death where contact was maintained between the epidermis and dermis, while where separation occurred limited keratinocytic death was observed. The earliest changes occurred at lower threshold fluences (4-6 J/cm2). After 24 h, these doses resulted in extensive epidermal necrosis with focal acute inflammatory infiltrates. At 48 h, the degree of epidermal "slough" was proportional to the energy density delivered and was maximal with a fluence of 5.7 J/cm2 delivered whereas with a fluence of 3.8 J/cm2 thin slough (0.02 mm) was observed. These findings suggest that low-dose CO2 laser irradiation may provide a new approach to selectively damage the epidermis with minimal dermal damage.

  20. Ultra-fast Movies Resolve Ultra-short Pulse Laser Ablation and Bump Formation on Thin Molybdenum Films

    Science.gov (United States)

    Domke, Matthias; Rapp, Stephan; Huber, Heinz

    For the monolithic serial interconnection of CIS thin film solar cells, 470 nm molybdenum films on glass substrates must be separated galvanically. The single pulse ablation with a 660 fs laser at a wavelength of 1053 nm is investigated in a fluence regime from 0.5 to 5.0 J/cm2. At fluences above 2.0 J/cm2 bump and jet formation can be observed that could be used for creating microstructures. For the investigation of the underlying mechanisms of the laser ablation process itself as well as of the bump or jet formation, pump probe microscopy is utilized to resolve the transient ablation behavior.

  1. Imtechella halotolerans gen. nov., sp. nov., a member of the family Flavobacteriaceae isolated from estuarine water

    Digital Repository Service at National Institute of Oceanography (India)

    Surendra, V.; Bhawana, P.; Suresh, K.; Srinivas, T.N.R.; AnilKumar, P.

    1T and the type strains of its closest relatives Strains: 1, K1T; 2, Z. amylolytica JCM 14016T; 3, Coenonia anatina LMG 14382T (data from Vandamme et al., 1999); 4, Joostella marina DSM 19592T (Quan et al., 2008); 5, Leptobacterium flavescens MBIC... Table 2. Comparison of the fatty acid composition of strain K1T and the type strains of its closest relatives Strains: 1, K1T; 2, Zhouia amylolytica JCM 14016T; 3, Coenonia anatina LMG 14382T (data from Vandamme et al., 1999); 4, Joostella marina DSM...

  2. Marinobacter nitratireducens sp. nov., a halophilic and lipolytic bacterium isolated from coastal surface sea water

    Digital Repository Service at National Institute of Oceanography (India)

    Bhumika, V.; Ravinder, K.; Korpole, S.; Srinivas, T.N.R.; AnilKumar, P.

    GmbH, Germany (Marinobacter hydrocarbonoclasticus DSM 8798T). Strain AK21T was characterized simultaneously with M. mobilis JCM 15154T, M. xestospongiae JCM 17469T and M. hydrocarbonoclasticus DSM 8798T. Cell morphology studies of the strain AK21T... the reference strains by the absence or low or high amount of C18:1 ω7c, summed feature 3, C18:1 ω9c and C16:1 ω9c (Table 2). The low and high amounts of fatty acids summed feature 3, C18:1 ω9c and C16:1 ω9c were comparable with M. hydrocarbonoclasticus DSM...

  3. Estudo clínico e anatomopatológico da cicatrização cutânea no gato doméstico: utilização do laser de baixa potência GaAs (904 nm

    Directory of Open Access Journals (Sweden)

    Angélica Cecília Tatarunas

    1998-04-01

    Full Text Available A pesquisa avalia a ação do laser de baixa potência Arseneto de Gálio (904 nm em feridas cirúrgicas de pele de felinos. Utilizamos 63 animais divididos em 3 grupos: A - radiados com 4J/cm2 , B - radiados com 2J/cm2 e C - controle, não radiados. A aplicação da radiação foi única no pós-operatório imediato em feridas cirúrgicas de gatas submetidas a ovariohisterectomia por conveniência. Realizamos estudo macroscópico e de microscopia de luz (Hematoxilina e Eosina nos tempos 2º, 4º, 8º e 15º dias de pós-operatório. Obtivemos clínica e microscopicamente resultados que sugerem um incremento na cicatrização das feridas radiadas quando comparado com o grupo controle e, se mostrando vantajosa ainda a radiação com 2J/cm2 em relação a 4J/cm2. Acreditamos, portanto ser o laser um adjuvante na cicatrização cutânea, podendo otimizar a evolução de feridas pós-cirúrgicas por primeira intenção nas condições e espécie animal estudada.This research evaluates the action of the Galium Arsenide laser (904 nm in feline cutaneous surgical wounds. We used 63 animals divided in 3 groups: A - radiated with 4J/cm2 , B - radiated with 2J/cm2 and C - control, not radiated. The aplication of the laser was accomplished in only one session in the immediate pos-operative procedures just after elective ovariohisterectomy. The macroscopical and microscopical analyses (Hematoxilin and Eosin of the skin were performed in 2, 4, 8 and 15 days pos-operatively. As result we obtained clinical and microscopical increase in the radiated wounds compared with control group and the energy densitie 2J/cm2 was more efficient than 4J/cm2 . Therefore we believe that the laser device can be used as coadjuvant in the healing process of skin wounds, in addition to optimizing the evolution of first intention post-surgery skin wounds in the studied species and circunstances.

  4. Threshold Property of Photoresist Film for Two-photon Optical Memory

    Institute of Scientific and Technical Information of China (English)

    ZHANG Jiangying; MING Hai; LIANG Zhongcheng; WANG Pei; XIE Jianping; XIE Aifang; ZHANG Zebo

    2001-01-01

    Two-photon threshold property of photoresist films have been studied by changing exposure energy. When photoresist film is irradiated by Ti∶Sapphire laser with wavelength 770 nm, pulse width 130 fs, repetition rate 82 MHz, the damage and recording thresholds of the material are 9.15×105 J/cm2 and below 5.57×105 J/cm2, respectively. The principle experiments of two-photon optical memory are demonstrated in photoresist film. The patterns of optical bit data storage are realized at different input power density. The corresponding 3-D tomographies of these recorded spots are scanned under near-field optical microscope.

  5. The effect of degenerate atomic levels on the field state dissipation in two-photon Jaynes-Cummings model

    Institute of Scientific and Technical Information of China (English)

    周玲; 宋鹤山; 李崇; 郭彦青

    2003-01-01

    The dissipation of the field in the two-photon Jaynes-Cummings model (JCM) with degenerate atomic levels was studied. The initial degenerate atomic state affects the field coherence loss. When the degenerate atom is initially in an equal probability superposition state, the field coherence loss is smallest. It is found that the degeneracy of the atomic level increases the period of entanglement between the atom and the field. When the degeneracy was considered, the coherence properties of the field could be affected by the reservoir qualitatively, if a nonlinear two-photon process is involved. This is different from the dissipation of one-photon JCM with degenerate atomic levels.

  6. Angular distributions of emitted particles by laser ablation of silver at 355 nm

    DEFF Research Database (Denmark)

    Svendsen, Winnie Edith; Schou, Jørgen; Hansen, T.;

    1998-01-01

    The angular distribution of laser ablated silver in vacuum has been measured in situ with an array of quartz-crystal microbalances. The silver surface was irradiated by ns pulses from a Nd:YAG laser operating at 355 nm for fluences ranging from 0.7 J/cm2 to 8 J/cm2. The distribution is strongly p...... peaked in the forward direction corresponding to cosp/, where p varies from 5 to 12 for the largest beam spot, but is less peaked for the smallest beam spots. The total collected yield of ablated atoms is about 221015 Ag atoms per pulse for the highest pulse energies....

  7. 980 nm diode lasers in oral and facial practice: current state of the science and art

    OpenAIRE

    Apollonia DESIATE, Stefania CANTORE, Domenica TULLO, Giovanni PROFETA, Felice Roberto GRASSI, Andrea BALLINI

    2009-01-01

    Aim: To evaluate the safety and efficacy of a 980nm diode laser for the treatment of benign facial pigmented and vascular lesions, and in oral surgery. Materials and Methods: 20 patients were treated with a 980 nm diode laser. Oral surgery: 5 patients (5 upper and lower frenulectomy). Fluence levels were 5-15 J/cm2; pulse lengths were 20-60 ms; spot size was 1 mm. Vascular lesions: 10 patients (5 small angiomas, 5 telangiectases). Fluences were 6-10 J/cm2; pulse lengths were 10-50 ms; spot si...

  8. BRIEF COMMUNICATIONS: Experimental study of the energy balance in the interaction of a pulsed CO2 laser with metal and insulating targets in air

    Science.gov (United States)

    Babaeva, N. A.; Vas'kovskiĭ, Yu M.; Rovinskiĭ, R. E.; Ryabinkina, V. A.

    1991-09-01

    Measurements were made of components of the energy balance in the interaction of pulsed CO2 laser radiation with Dural, glass, quartz, ebonite, and Plexiglas in air at atmospheric pressure. At laser energy densities between 1 and 20 J/cm2 and in the spectral range 0.2-7 μm, the re-emission of radiation by the laser plasma was found to be less than 1 %. At energy densities exceeding 10 J/cm2, up to 90% of the laser energy failed to reach the irradiated surface.

  9. Optical limiting and nonlinear optical properties of gold-decorated graphene nanocomposites

    Science.gov (United States)

    Podila, Ramakrishna; Pradhan, Prabin; Molli, Muralikrishna; Kaniyoor, Adarsh; Muthukumar v, Sai; Sai, S. Siva Sankara; Ramaprabhu, S.; Rao, Apparao; Department of Physics, Sri Sathya Sai Institute of Higher Learning Team; Alternative Energy; Nanotechnology Laboratory (AENL), Indian Institute of Technology Madras Team; Department of Physics; Astronomy, Clemson Nanomaterials Center, Clemson University Team

    2015-03-01

    Although metal nanoparticle-decorated nanomaterials exhibit excellent optical limiting (OL) performance at a relatively higher fluence (>9 J/cm2) , there is a dearth of OL materials for protecting low damage threshold (metal d-orbitals and graphene p-orbitals often leads to undesirable changes in graphene's electronic structure, which adversely affects OL. Here, we demonstrate that d-orbitals of Au nanoparticles exhibit little or no rehybridization with graphene, and result in an enhanced OL behavior even at a low fluence of ~ 0.4 J/cm2 due to the excellent photo-absorption of Au combined with rapid carrier thermalization by graphene.

  10. Progress of Photodynamic Therapy in Gastric Cancer

    OpenAIRE

    Seishiro Mimura; Hiroyuki Narahara; Toru Otani; Shigeru Okuda

    1999-01-01

    Progress of photodynamic therapy (PDT) in gastric cancer and the clinical outcome are described in this paper. (1) We included the whole lesion and a 5 mm margin in the field for irradiation. Marking by injection of India-ink showing the irradiation field was performed beforehand. (2) We established the standard light dose to be 90 J/cm2 for an argon dye laser and 60 J/cm2 for a pulse wave laser. (3) The size of cancerous lesion curable by PDT was expanded from 3 cm in diameter, i.e. 7 cm2 in...

  11. Distributed Leadership as Work Redesign: Retrofitting the Job Characteristics Model

    Science.gov (United States)

    Mayrowetz, David; Murphy, Joseph; Louis, Karen Seashore; Smylie, Mark A.

    2007-01-01

    In this article, we revive work redesign theory, specifically Hackman and Oldham's Job Characteristics Model (JCM), to examine distributed leadership initiatives. Based on our early observations of six schools engaged in distributed leadership reform and a broad review of literature, including empirical tests of work redesign theory, we retrofit…

  12. Motivating effects of task and outcome interdependence in work teams

    NARCIS (Netherlands)

    Van der Vegt, G.S.; Emans, B.J.M.; Van de Vliert, E.

    Motivation and performance theories in organizational psychology tend to have a predominantly individualistic scope, relating characteristics of individual tasks to personal work outcomes of individuals (e.g., the Job Characteristics Model [JCM]). The present study goes beyond the realm of

  13. AcEST: DK952901 [AcEST

    Lifescience Database Archive (English)

    Full Text Available Definition tr|A8A8G8|A8A8G8_IGNH4 Anaerobic ribonucleoside-triphosphate reductase OS=Ignicoccus hospital...te reductase OS=Ignicoccus hospitalis (strain KIN4/I / DSM 18386 / JCM 14125) GN=Igni_0036 PE=4 SV=1 Length

  14. AcEST: DK960459 [AcEST

    Lifescience Database Archive (English)

    Full Text Available ein Alba OS=Ignicoccus hospitalis (strain KIN4/I / DSM 18386 / JCM 14125) GN=albA...VDTVEIVRNRFLPD--KIEVKEIRIG 74 Query: 406 DE 411 + Sbjct: 75 SQ 76 >sp|A8A8V6|ALBA_IGNH4 DNA/RNA-binding prot

  15. AcEST: BP918973 [AcEST

    Lifescience Database Archive (English)

    Full Text Available 8 Definition sp|A8A8L8|SUCC_IGNH4 Succinyl-CoA ligase [ADP-forming] subunit beta OS=Ignicoccus hospital...e [ADP-forming] subunit beta OS=Ignicoccus hospitalis (strain KIN4/I / DSM 18386 / JCM 14125) GN=sucC PE=3 S

  16. AcEST: DK953566 [AcEST

    Lifescience Database Archive (English)

    Full Text Available : 464 YTTPPKQTFARYEER 508 Y P + + + ER Sbjct: 403 YKEPLLECYTKLRER 417 >sp|A8A9E3|SYP_IGNH4 Prolyl-tRNA synthetase OS=Ignicoccus hospi...talis (strain KIN4/I / DSM 18386 / JCM 14125) GN=proS PE=3 SV=1 Length = 478 Score

  17. AcEST: BP918420 [AcEST

    Lifescience Database Archive (English)

    Full Text Available D 180 >sp|A8AC98|APGM_IGNH4 2,3-bisphosphoglycerate-independent phosphoglycerate mutase OS=Ignicoccus hosp...italis (strain KIN4/I / DSM 18386 / JCM 14125) GN=apgM PE=3 SV=1 Length = 416 Score

  18. Laser ablation of lysozyme with UV, visible and infrared femto- and nanosecond pulses

    DEFF Research Database (Denmark)

    Schou, Jørgen; Canulescu, Stela; Matei, Andreea

    industry. Lysozyme molecules do not absorb energy for wavelengths above 310 nm, but nevertheless there is a strong mass loss by ablation for laser irradiation in the visible regime. The total ablation yield of lysozyme at 355 nm and at 2 J/cm2 is about 155 µg/pulse, possibly one of the highest ablation...

  19. Laser-induced plasma from pure and doped water-ice at high fluence by ultraviolet and infrared radiation - art. no. 70050X

    DEFF Research Database (Denmark)

    Schou, Jørgen; Matei, A.; Rodrigo, Katarzyna Agnieszka

    2008-01-01

    Ice made of ultrapure water or water doped with 1 % polymer (polyethylene glycol, "PEG") was irradiated by laser light with fluences between 2 and 80 J/cm(2) in the ultraviolet (UV) regime at 355 nm and in the infrared (IR) regime at 1064 nm in vacuum. In the UV regime there is a threshold for pl...

  20. Laser deposition rates of thin films of selected metals and alloys

    DEFF Research Database (Denmark)

    Cazzaniga, Andrea Carlo; Canulescu, Stela; Schou, Jørgen

    . The experiments have been carried out at a laser wavelength of 355 nm in vacuum with a PLD chamber at DTU Fotonik, Risø Campus. The deposition rates have been measured by a quartz crystal microbalance. At a laser fluence of 2 J/cm2 the total ablated yield of copper is about 1x1015 atoms per pulse. The film...

  1. In vivo Photonic Stimulation of Sciatic Nerve with a 1470 nm Laser

    Directory of Open Access Journals (Sweden)

    Marie Dautrebande

    2016-07-01

    Full Text Available Photonic stimulation is a new modality of nerve stimulation, which could overcome some of the electrical stimulation limitations. In this paper, we present the results of photonic stimulation of rodent sciatic nerve with a 1470 nm laser. Muscle activation was observed with radiant exposure of 0.084 J/cm2.

  2. Cytokine responses of human intestinal epithelial-like Caco-2 cells to the nonpathogenic bacterium Bacillus subtilis (natto).

    Science.gov (United States)

    Hosoi, Tomohiro; Hirose, Rieko; Saegusa, Shizue; Ametani, Akio; Kiuchi, Kan; Kaminogawa, Shuichi

    2003-05-15

    Intestinal epithelial cells produce cytokines in response to pathogenic bacteria. However, cellular responses of these cells to nonpathogenic strains, such as Bacillus subtilis, are yet to be determined. In this study, we investigate whether epithelial-like human colon carcinoma Caco-2 cells produce cytokines in response to B. subtilis or B. subtilis (natto). The latter strain is utilized for manufacturing the fermented soy food "natto". Live cells of nonpathogenic B. subtilis JCM 1465(T), B. subtilis (natto) and E. coli JCM 1649(T), as well as pathogenic S. enteritidis JCM 1652 and P. aeruginosa JCM 5516 strains, induced secretion of interleukin-6 (IL-6) and/or IL-8, but not IL-7, IL-15 or tumor necrosis factor alpha (TNF-alpha). Transepithelial electrical resistance (TER) of Caco-2 cell monolayers cultured with E. coli, S. enteritidis or P. aeruginosa decreased more rapidly than that of cells cultured with B. subtilis or B. subtilis (natto). The amounts of cytokine induced by B. subtilis (natto) cells were strain-dependent. Moreover, B. subtilis (natto) cells subjected to hydrochloric acid treatment, but not autoclaving, induced a higher secretion of IL-6 and IL-8 than intact cells. Tyrosine kinase inhibitors, including AG126 and genistein, suppressed cytokine secretion. Our results suggest that the nonpathogenic B. subtilis (natto) bacterium induces cytokine responses in intestinal epithelial cells via activation of an intracellular signaling pathway, such as that of nuclear factor-kappa B (NF-kappaB).

  3. Tailoring out-of-plane magnetic properties of pulsed laser deposited FePt thin films by changing laser energy fluence

    Science.gov (United States)

    Wang, Ying; Tan, T. L.; Tan, K. S.; Lee, P.; Liu, Hai; Yadian, Boluo; Hu, Ge; Huang, Yizhong; Ramanujan, R. V.; Rawat, R. S.

    2014-10-01

    Magnetic properties of pulsed laser deposited (PLD) FePt thin films are investigated at three different laser energy fluences of 51, 136 and 182 J/cm2. Deposition at lower laser energy fluence (51 J/cm2) yields softer out-of-plane coercivity (≤0.4 kG), whereas deposition at higher laser energy fluence (136 and 182 J/cm2) results in harder out-of-plane coercivity (≥5.0 kG). The improved coercivity is found to be attributed to the formation of vacancy defects in thin films, which is indicated by stress change from tensile to compressive form with increasing laser energy fluence. Maximum out-of-plane saturated magnetization of 615 emu/cm3 and remanent squareness ratio of 0.88 are achieved for 16 nm thick FePt thin films deposited at moderate laser energy fluence of 136 J/cm2, making them suitable for high density perpendicular data storage applications.

  4. Photobiomodulation with low-level diode laser promotes osteoblast migration in an in vitro micro wound model

    Science.gov (United States)

    Tschon, Matilde; Incerti-Parenti, Serena; Cepollaro, Simona; Checchi, Luigi; Fini, Milena

    2015-07-01

    Laser photobiomodulation can improve bone healing, but well-defined treatment parameters are lacking. Saos-2 human osteoblast-like cells were subjected to an in vitro scratch-wound healing assay and irradiated by a 915-nm gallium-aluminum-arsenide diode laser for 0, 48, 96, and 144 s using doses of, respectively, 0, 5, 10, and 15 J/cm2. Wound area was measured after 4, 24, 48, and 72 h. Cell viability, DNA content, gene expression, and release of bone-related proteins were evaluated after 24, 48, and 72 h. Laser significantly improved wound healing compared with nonirradiated controls. Cells treated with laser doses of 5 and 10 J/cm2 reached wound closure after 72 h, followed by 15 J/cm2 after 96 h. With the cell proliferation inhibitor Mitomycin C, the doses of 10 and 15 J/cm2 maintained an improved wound healing compared with controls. Laser increased collagen type 1 gene expression with higher doses inducing a longer-lasting effect, whereas transforming growth factor-beta 1 showed comparable or decreased levels in irradiated versus nonirradiated groups, with no effect on protein release. This study demonstrated that laser photobiomodulation at 915 nm promoted wound healing mainly through stimulation of cell migration and collagen deposition by osteoblasts.

  5. Motivating effects of task and outcome interdependence in work teams

    NARCIS (Netherlands)

    Van der Vegt, G.S.; Emans, B.J.M.; Van de Vliert, E.

    1998-01-01

    Motivation and performance theories in organizational psychology tend to have a predominantly individualistic scope, relating characteristics of individual tasks to personal work outcomes of individuals (e.g., the Job Characteristics Model [JCM]). The present study goes beyond the realm of individua

  6. Effects of red laser, infrared, photodynamic therapy, and green LED on the healing process of third-degree burns: clinical and histological study in rats.

    Science.gov (United States)

    de Vasconcelos Catão, Maria Helena Chaves; Nonaka, Cassiano Francisco Weege; de Albuquerque, Ricardo Luiz Cavalcanti; Bento, Patrícia Meira; de Oliveira Costa, Roniery

    2015-01-01

    The aim of this study was to evaluate the effects of red laser, infrared, photodynamic therapy, and green light-emitting diode (LED) on the healing process of skin burns through clinical and histopathologic analysis in rats. For this, 100 animals were randomly divided into five groups: G1-untreated control (CTR), G2-red laser (LVER), G3-infrared (LINF), G4-photodynamic therapy (PDT), and G5-green LED. Burn was induced on the dorsum of the rat and the treatment of the experimental groups was red light (10 J/cm(2), 10 s, 40 mW, and λ660 nm), infrared (10 J/cm(2), 10 s, 40 mW, and λ780 nm), green LED irradiation (60 J/cm(2), 10 s, λ520, and 550 nm), and photodynamic therapy (10 J/cm(2), 40 mW, and λ660 nm), the latter combined with methylene blue photosensitizer at concentration 0.5 μg/mL. Applications were performed daily until day prior to sacrifice of the animal at 3, 7, 14, and 21 days with intraperitoneal anesthetic overdose. The specimens collected were clinically examined and soon after processed and stained with hematoxylin-eosin and Picrosirius for analysis under light and polarized light microscopy, respectively. Animals treated with LVER, LINF, PDT (p therapy, and green LED favored the healing process of third-degree burns in rats.

  7. The relationship between ethical leadership and core job characteristics

    NARCIS (Netherlands)

    Piccolo, R.F.; Greenbaum, R.; den Hartog, D.N.; Folger, R.

    2010-01-01

    In the current study, we draw on the original job characteristics model (JCM) and on an elaborated model of work design to examine relationships between ethical leadership, task significance, job autonomy, effort, and job performance. We suggest that leaders with strong ethical commitments who regul

  8. Femtosecond laser ablation of cemented carbides: properties and tribological applications

    Science.gov (United States)

    Dumitru, G.; Romano, V.; Weber, H. P.; Gerbig, Y.; Haefke, H.; Bruneau, S.; Hermann, J.; Sentis, M.

    Laser ablation with fs laser pulses was performed in air on cobalt cemented tungsten carbide by means of a Ti : sapphire laser (800 nm, 100 fs). Small and moderate fluences (2, 5, 10 J/cm2) and up to 5×104 pulses per irradiated spot were used to drill holes with aspect ratios up to 10. Cross-section cuts from laser-irradiated samples were produced and they were analysed with optical microscopy and SEM. EDX analyses were carried out on selected zones. Quasi-cylindrical holes were found for 2 J/cm2, whereas for 5 and 10 J/cm2 irregular shapes (lobes, bottoms wider than hole entrances) were found to occur after a given number of incident pulses. Layers with modified structure were evidenced at pore walls. SEM revealed a denser structure, while EDX analyses showed uniform and almost similar contents of W, C, and Co in these layers. As a direct application, patterning of coated WC-Co was carried out with 2 J/cm2 and 100 pulses per pore. The resulted surfaces were tribologically tested and these tests revealed an improved friction and wear behaviour.

  9. A study on matrix assisted pulsed evaporation (MAPLE) of organic materials

    DEFF Research Database (Denmark)

    Matei, Andreea; Canulescu, Stela; Constantinescu, Catalin

    2012-01-01

    Organic films can be produced either by MAPLE or directly by PLD (Pulsed laser deposition). For a reasonable deposition rate of ng/cm2 per pulse for film production by MAPLE a fluence of 1-1.5 J/cm2 is required at the laser wavelength of 355 nm, while the fluence can be considerably lower at 248 ...

  10. Photofrin-mediated photodynamic therapy of chemically-induced premalignant lesions and squamous cell carcinoma of the palatal mucosa in rats

    NARCIS (Netherlands)

    Nauta, JM; vanLeengoed, HLLM; Witjes, MJH; Nikkels, PGJ; Vermey, A; Roodenburg, JLN

    1997-01-01

    Photodynamic therapy (PDT), an experimental cancer therapy, was studied in an animal model of chemically-induced epithelial dysplasia and squamous cell carcinoma. PDT was performed 24 hours after i.v. injection of 2.5 mg/kg bw Photofrin, and using 100 J/cm(2) incident light at two activation wavelen

  11. 溶胀法测定HNBR的溶解度参数%Determination of Solubility Parameters of HNBR with Swelling Method

    Institute of Scientific and Technical Information of China (English)

    刘广永; 商元元; 曾艳; 王义亮; 邱桂学

    2012-01-01

    测定了Therban2007,Therban3407,Therban4307和Therban5008 4种氢化丁腈橡胶(HNBR)的溶解度参数,并与其预测值进行了对比.结果表明,溶解度参数的测定值略小于预测值,4种不同丙烯腈含量的HNBR具有相似的溶胀性能,HNBR的溶解度参数范围均为18~22 (J/cm3)1/2.溶解度参数在18~22(J/cm3)1/2的溶剂可有效地溶胀HNBR.%The solubility parameter of hydrogenated nitrile rubber (HNBR) of Therban2007, Therban3407, Therban4307 and Therban5008 were determined and compared with the predicted values. The results showed that the determined values were slightly less than the predicted values, the four kinds of HNBR with different acrylonitrile content exhibited similar swelling properties, and the range of solubility parameter of HNBR was 18~22 (J/cm3)1/2. The solvents with the numerical value of solubility parameter in the range of 18~22 (J/cm3)1/2 could effectively swell the HNBR.

  12. Employees' Job Satisfaction: A Test of the Job Characteristics Model Among Social Work Practitioners.

    Science.gov (United States)

    Blanz, Mathias

    2017-01-01

    The present article describes an investigation of the Job Characteristics Model (JCM) by Hackman and Oldham (1976) for the prediction of job satisfaction of employees in social work areas. While there is considerable evidence for the JCM with respect to profit-oriented organizations, it was tested whether it can also be applied to the non-profit sector. The present study surveyed 734 holders of jobs in social work in Germany in order to assess their job satisfaction and the core variables of the JCM (i.e., the five job characteristics and the three psychological states). Regression and mediation analyses were used to examine the relations between these variables. The results showed that the expected relations were remarkably in accordance with the findings from the for-profit sector. All model variables correlated positively with job satisfaction, with the psychological states showing higher coefficients than the job characteristics. In addition, the influence of job characteristics on job satisfaction was significantly mediated through the psychological states. These findings were supported by a replication study. Implications of the JCM for practice, in particular for assessment and interventions in social work organizations, are discussed.

  13. UVA radiation augments cytotoxic activity of psoralens in melanoma cells.

    Science.gov (United States)

    Wrześniok, Dorota; Beberok, Artur; Rok, Jakub; Delijewski, Marcin; Hechmann, Anna; Oprzondek, Martyna; Rzepka, Zuzanna; Bacler-Żbikowska, Barbara; Buszman, Ewa

    2017-07-01

    Melanoma is an aggressive form of skin cancer. The aim of the study was to evaluate the influence of UVA radiation and psoralens: 5-methoxypsoralen (5-MOP) or 8-methoxypsoralen (8-MOP) on melanoma cells viability. The amelanotic C32 and melanotic COLO829 human melanoma cell lines were exposed to increasing concentrations of psoralens (0.1-100 μM) in the presence or absence of UVA radiation. Cell viability was evaluated by the WST-1 assay. We demonstrated that 8-MOP, in contrast to 5-MOP, has no cytotoxic effect on both melanoma cell lines. Simultaneous exposure of cells to 8-MOP and UVA radiation caused significant cytotoxic response in C32 cells where the EC50 value was estimated to be 131.0 μM (UVA dose: 1.3 J/cm(2)) and 105.3 μM (UVA dose: 2.6 J/cm(2)). The cytotoxicity of 5-MOP on both C32 and COLO829 cells was significantly augmented by UVA radiation - the EC50 was estimated to be 22.7 or 7.9 μM (UVA dose: 1.3 J/cm(2)) and 24.2 or 7.0 μM (UVA dose: 2.6 J/cm(2)), respectively. The demonstrated high cytotoxic response after simultaneous exposure of melanoma cells to psoralens and UVA radiation in vitro suggests the usefulness of PUVA therapy to treat melanoma in vivo.

  14. Complete Genome Sequence of the Hyperthermophilic Sulfate-Reducing Bacterium Thermodesulfobacterium geofontis OPF15T.

    Science.gov (United States)

    Elkins, James G; Hamilton-Brehm, Scott D; Lucas, Susan; Han, James; Lapidus, Alla; Cheng, Jan-Fang; Goodwin, Lynne A; Pitluck, Sam; Peters, Lin; Mikhailova, Natalia; Davenport, Karen W; Detter, John C; Han, Cliff S; Tapia, Roxanne; Land, Miriam L; Hauser, Loren; Kyrpides, Nikos C; Ivanova, Natalia N; Pagani, Ioanna; Bruce, David; Woyke, Tanja; Cottingham, Robert W

    2013-04-11

    Thermodesulfobacterium geofontis OPF15(T) (ATCC BAA-2454, JCM 18567) was isolated from Obsidian Pool, Yellowstone National Park, and grows optimally at 83°C. The 1.6-Mb genome sequence was finished at the Joint Genome Institute and has been deposited for future genomic studies pertaining to microbial processes and nutrient cycles in high-temperature environments.

  15. Cytotoxic responses to 405nm light exposure in mammalian and bacterial cells: Involvement of reactive oxygen species.

    Science.gov (United States)

    Ramakrishnan, Praveen; Maclean, Michelle; MacGregor, Scott J; Anderson, John G; Grant, M Helen

    2016-06-01

    Light at wavelength 405 nm is an effective bactericide. Previous studies showed that exposing mammalian cells to 405 nm light at 36 J/cm(2) (a bactericidal dose) had no significant effect on normal cell function, although at higher doses (54 J/cm(2)), mammalian cell death became evident. This research demonstrates that mammalian and bacterial cell toxicity induced by 405 nm light exposure is accompanied by reactive oxygen species production, as detected by generation of fluorescence from 6-carboxy-2',7'-dichlorodihydrofluorescein diacetate. As indicators of the resulting oxidative stress in mammalian cells, a decrease in intracellular reduced glutathione content and a corresponding increase in the efflux of oxidised glutathione were observed from 405 nm light treated cells. The mammalian cells were significantly protected from dying at 54 J/cm(2) in the presence of catalase, which detoxifies H2O2. Bacterial cells were significantly protected by sodium pyruvate (H2O2 scavenger) and by a combination of free radical scavengers (sodium pyruvate, dimethyl thiourea (OH scavenger) and catalase) at 162 and 324 J/cm(2). Results therefore suggested that the cytotoxic mechanism of 405 nm light in mammalian cells and bacteria could be oxidative stress involving predominantly H2O2 generation, with other ROS contributing to the damage.

  16. Research of Energy Density of He-Ne Laser in treatment of Tinnitus with Laser Meridian Points Therapy%耳鸣症激光经络穴位疗法氦-氖激光剂量对比研究

    Institute of Scientific and Technical Information of China (English)

    邱德明; 邱素兰

    2001-01-01

    本文首次报道,耳鸣症病人1035例1854只患耳、在激光经络穴位疗法(LMPT)治疗时,将每次每穴应用氦-氖激光的剂量(能量密度)随机分为A(9.555±1.911J/cm2)B、C、D(95.544±9.555J/cm2)E、F、G、H、I(257.958±9.555J/cm2)九个不同剂量的治疗观察组(每组115例205~208耳).结果疗效最理想者是D组,提示LMPT治疗耳鸣症采用氦-氖激光的最佳剂量为每次每穴投照95.544±9.555J/cm2,为医疗临床提供了指导性应用参数.

  17. The relationship between ethical leadership and core job characteristics

    NARCIS (Netherlands)

    Piccolo, R.F.; Greenbaum, R.; den Hartog, D.N.; Folger, R.

    2010-01-01

    In the current study, we draw on the original job characteristics model (JCM) and on an elaborated model of work design to examine relationships between ethical leadership, task significance, job autonomy, effort, and job performance. We suggest that leaders with strong ethical commitments who regul

  18. The relationship between ethical leadership and core job characteristics

    NARCIS (Netherlands)

    Piccolo, R.F.; Greenbaum, R.; den Hartog, D.N.; Folger, R.

    2010-01-01

    In the current study, we draw on the original job characteristics model (JCM) and on an elaborated model of work design to examine relationships between ethical leadership, task significance, job autonomy, effort, and job performance. We suggest that leaders with strong ethical commitments who

  19. Rare earth metals influence on morphology of non-metallic inclusions and mechanism of GP240GH and G17CrMo5-5cast steel cracking

    Directory of Open Access Journals (Sweden)

    M. Gajewski

    2009-10-01

    Full Text Available This paper presents results of research carried out in order to specify the influence of the rare earth metals on the morphology of the occuring non-metallic inclusions as well as on the cracking mechanism of GP240GH cast carbon steel and G17CrMo5-5 (0.18%C, 1.2%Cr, 0.53%Mo high temperature cast steel. The tests have been performed on successive industrial melts adding rare earth metals to the ladle during tapping of heat melt from the furnace. It was found that ball-shaped non-metalic inclusions occuring as a result of the rare earth metals influence are heterogenic and they significantly influence the cracking mechanism of Charpy specimens and the impact strength. The morphology of the specimens fracture surface has been substantially changed as a result of the rare earth metals modification. The impact strength of the tested cast carbon steel increased from 100 J/cm2 to ca 155 J/cm2, and the high-temperature cast steel from 30 J/cm2 to ca 100 J/cm2.

  20. Ordered YBCO sub-micron array structures induced by pulsed femtosecond laser irradiation.

    Science.gov (United States)

    Luo, C W; Lee, C C; Li, C H; Shih, H C; Chen, Y-J; Hsieh, C C; Su, C H; Tzeng, W Y; Wu, K H; Juang, J Y; Uen, T M; Chen, S P; Lin, J-Y; Kobayashi, T

    2008-12-08

    We report on the formation of organized sub-micron YBa(2)Cu(3)O(7) (YBCO) dots induced by irradiating femtosecond laser pulses on YBCO films prepared by pulse laser deposition with fluence in the range of 0.21 approximately 0.53 J/cm(2). The morphology of the YBCO film surface depends strongly on the laser fluences irradiated. At lower laser fluence (approximately 0.21 J/cm(2)) the morphology was pattern of periodic ripples with sub-micrometer spacing. Slightly increasing the laser fluence to 0.26 J/cm(2) changes the pattern into organized sub-micron dots with diameters ranging from 100 nm to 800 nm and height of 150 nm. Further increase of the laser fluence to over 0.32 J/cm(2), however, appeared to result in massive melting and led to irregular morphology. The mechanism and the implications of the current findings will be discussed. Arrays of YBCO sub-micron dots with T(c) = 89.7 K were obtained.

  1. The streptococcal inhibitor of complement (SIC) protects Streptococcus pyogenes from bacteriocin-like inhibitory substance (BLIS) from Streptococcus salivarius.

    Science.gov (United States)

    Minami, Masaaki; Ohmori, Daisuke; Tatsuno, Ichiro; Isaka, Masanori; Kawamura, Yoshiaki; Ohta, Michio; Hasegawa, Tadao

    2009-09-01

    Streptococcus salivarius inhibits the growth of Streptococcus pyogenes in vitro. Streptococcus pyogenes has various virulence factors, including the streptococcus inhibitor of complement (SIC). Although SIC inhibits the activity of the peptides LL-37 and NAP1, the relationship between SIC and the bacteriocin-like inhibitory substance (BLIS) has not been elucidated. Here, we evaluated whether S. salivarius BLIS affects S. pyogenes SIC. We created three deltasic mutant strains from three S. pyogenes strains and performed deferred antagonism assays. The test strains were BLIS-positive S. salivarius JCM5707 and BLIS-negative S. salivarius NCU12. Deferred antagonism assays with JCM5707 showed that the inhibitory zones in the three deltasic mutant strains were wider than those in the three wild-type strains. Streptococcus pyogenes was cultured in BLIS-containing broth and the change in SIC in the supernatant was assessed by two-dimensional gel electrophoresis (2-DE). The 2-DE analysis of S. pyogenes exoproteins with the JCM5707 supernatant showed reduced SIC compared with those without the JCM5707 supernatant. Changes in sic mRNA levels affected by S. salivarius BLIS were evaluated by a reverse transcriptase-PCR. The sic mRNA level was affected more by the BLIS-positive S. salivarius than by the BLIS-negative strain. Our result indicates that SIC plays a role in the inhibition of S. salivarius BLIS.

  2. Side-chain liquid-crystalline polyesters for optical information storage

    DEFF Research Database (Denmark)

    Hvilsted, Søren; Andruzzi, F.; Ramanujam, P.S.

    1992-01-01

    We report erasable holographic recording with a resolution of at least 2500 lines/mm on unoriented films of side-chain liquid-crystalline polyesters. Recording energies of approximately 1 J/cm2 have been used. We have obtained a diffraction efficiency of approximately 30% with polarization record...

  3. Chemical, morphological and chromatic behavior of mural paintings under Er:YAG laser irradiation

    Science.gov (United States)

    Striova, J.; Camaiti, M.; Castellucci, E. M.; Sansonetti, A.

    2011-08-01

    Several pigments (malachite CuCO3ṡCu(OH)2, azurite 2CuCO3ṡCu(OH)2, yellow ochre (goethite α-FeOOH, gypsum CaSO4ṡ2H2O), St. John's white CaCO3 formed from slaked lime) and respective mural paintings specimens were subjected to the free-running Er:YAG laser radiation in order to study their damage thresholds, in a broad range of laser fluences, both in dry and wet conditions. The specimens' damage thresholds were evaluated by spectroscopic methods, colorimetric measurements and microscopic observation. The pigments containing -OH groups were found to be more sensitive than St. John's white; hence the most sensitive paint layers in dry conditions are those containing malachite, azurite (both 1.3 J/cm2) and yellow ochre (2.5 J/cm2) as compared to the ones containing St. John's white (15.2 J/cm2). The presence of wetting agents (w.a.) attenuated the pigments chemical alteration. The damage thresholds of all the paint layers, in presence of w.a., were found to be around 2.5 J/cm2. The alteration was caused by thermo-mechanical damage and by binding medium ablation of a fresco and a secco prepared specimens, respectively.

  4. Antimicrobial photodynamic therapy with two photosensitizers on two oral streptococci: an in vitro study

    Science.gov (United States)

    Vahabi, S.; Fekrazad, R.; Ayremlou, S.; Taheri, S.; Lizarelli, R. F. Z.; Kalhori, K. A. M.

    2011-12-01

    Periodontal diseases are caused by infection of tissues supporting the teeth due to complex aggregate of bacteria known as biofilm and firstly colonized by streptococci. The aim of this in vitro study was to evaluate the effect of Radachlorin® and Toluidine Blue O (TBO)-mediated photodynamic therapy (PDT) on the viability of two oral streptococci. Bacterial suspensions of Streptococcus mutans and Streptococcus sanguis were subjected to either TBO or Radachlorin®, Then exposed to two different diode laser light at energy densities of 3, 6 J/cm2 at 633 nm and 6, 12 J/cm2 at 662 nm, respectively. The control groups were subjected to laser light alone, photosensitizer alone or received neither photosensitizer nor light exposure. The suspensions were then spread over specific agar mediums and viable microorganisms were counted after overnight incubation aerobically at 37°C, 5% CO2 and then reported as colony forming unit. The results indicated that photosensitization by the energy density of 6 J/cm2 with Radachlorin® and both 3 and 6 J/cm2 with TBO caused significant reduction in bacterial colony formation ( p oral streptococci in vitro.

  5. Blue light does not impair wound healing in vitro.

    Science.gov (United States)

    Masson-Meyers, Daniela Santos; Bumah, Violet Vakunseh; Enwemeka, Chukuka Samuel

    2016-07-01

    Irradiation with red or near infrared light promotes tissue repair, while treatment with blue light is known to be antimicrobial. Consequently, it is thought that infected wounds could benefit more from combined blue and red/infrared light therapy; but there is a concern that blue light may slow healing. We investigated the effect of blue 470nm light on wound healing, in terms of wound closure, total protein and collagen synthesis, growth factor and cytokines expression, in an in vitro scratch wound model. Human dermal fibroblasts were cultured for 48h until confluent. Then a linear scratch wound was created and irradiated with 3, 5, 10 or 55J/cm(2). Control plates were not irradiated. Following 24h of incubation, cells were fixed and stained for migration and fluorescence analyses and the supernatant collected for quantification of total protein, hydroxyproline, bFGF, IL-6 and IL-10. The results showed that wound closure was similar for groups treated with 3, 5 and 10J/cm(2), with a slight improvement with the 5J/cm(2) dose, and slower closure with 55J/cm(2) plight at low fluence does not impair in vitro wound healing. The significant decrease in IL-6 suggests that 470nm light is anti-inflammatory.

  6. Efficacy, tolerability, and safety of a long-pulsed ruby laser system in the removal of unwanted hair.

    Science.gov (United States)

    Polderman, M C; Pavel, S; le Cessie, S; Grevelink, J M; van Leeuwen, R L

    2000-03-01

    Unwanted hair growth is a common, usually physiologic phenomenon. In this study the efficacy and tolerability of a long-pulsed ruby laser system was compared with needle electrolysis and hot wax on three parts of the body. Thirty volunteers were treated three times on the forearm (n = 10), on the face (n = 10), or in the pubic area (n = 10) with 25 J/cm2 laser, 40 J/cm2 laser, needle electrolysis, and hot wax therapy. The 25 J/cm2 and 40 J/cm2 laser treated sites showed a statistically significant decrease (38% and 49%, respectively) in the number of hairs at the first visit after the last treatment compared to the pretreatment hair counts. No significant decrease was observed in the needle electrolysis and hot wax treated sites. Laser therapy yielded better results on the forearm than on the face or pubic area and was scored as the least painful. The long-pulsed ruby laser is a promising, well-tolerated method of epilation.

  7. Effects of phototherapy on cartilage structure and inflammatory markers in an experimental model of osteoarthritis

    Science.gov (United States)

    Oliveira, Poliani; Santos, Anderson Amaro; Rodrigues, Tamara; Tim, Carla Roberta; Pinto, Karina Zambone; Magri, Angela Maria Paiva; Fernandes, Kelly Rossetti; Mattiello, Stela M.; Parizotto, Nivaldo Antonio; Anibal, Fernanda Freitas; Rennó, Ana Claudia Muniz

    2013-12-01

    The aim of this study was to evaluate the effects of laser phototherapy on the degenerative modifications on the articular cartilage after the anterior cruciate ligament transection (ACLT) in the knee of rats. Eighty male rats (Wistar) were distributed into four groups: intact control group (IG), injured control group (CG), injured laser treated group at 10 J/cm2 (L10), and injured laser treated group at 50 J/cm2 (L50). Animals were distributed into two subgroups, sacrificed in 5 and 8 weeks postsurgery. The ACLT was used to induce knee osteoarthritis in rats. After 2 weeks postsurgery, laser phototherapy initiated and it was performed for 15 and 30 sessions. The histological findings revealed that laser irradiation, especially at 10 J/cm2, modulated the progression of the degenerative process, showing a better cartilage structure and lower number of condrocytes compared to the other groups. Laser phototherapy was not able to decrease the degenerative process measured by Mankin score and prevent the increase of cartilage thickness related to the degenerative process. Moreover, it did not have any effect in the biomodulation of the expression of markers IL1β, tumor necrosis factor-α, and metalloprotein-13. Furthermore, laser irradiated animals, at 50 J/cm2 showed a lower amount of collagen type 1.

  8. Purification and characterization of two phospho-β-galactosidases, LacG1 and LacG2, from Lactobacillus gasseri ATCC33323T

    NARCIS (Netherlands)

    Honda, Hiroyuki; Nagaoka, Seiji; Kawai, Yasushi; Kemperman, Robèr; Kok, Jan; Yamazaki, Yukiko; Tateno, Yoshio; Kitazawa, Haruki; Saito, Tadao

    2012-01-01

    Lactobacillus gasseri ATCC33323T expresses four enzymes showing phospho-β-galactosidase activity (LacG1, LacG2, Pbg1 and Pbg2). We previously reported the purification and characterization of two phospho-β-galactosidases (Pbg1 and Pbg2) from Lactobacillus gasseri JCM1031 cultured in lactose medium.

  9. Microstructure and Mechanical Properties of Bulk Nanostructured Cu-Ta Alloys Consolidated by Equal Channel Angular Extrusion

    Science.gov (United States)

    2014-07-01

    Averback RS, King WP. Scr Mater 2012;67:720. [2] Vo NQ, Chee SW, Schwen D, Zhang XA, Bellon P, Averback RS. Scr Mater 2010;63:929. [3] Zhang X, Wen JG...Cambridge University Press; 2007. [37] Li JCM. Mechanical properties of nanocrystalline materials. Singa- pore : Pan Stanford Publishing; 2011. [38] Wei QM

  10. Photobleaching and phototoxicity of KillerRed in tumor spheroids induced by continuous wave and pulsed laser illumination.

    Science.gov (United States)

    Kuznetsova, Daria S; Shirmanova, Marina V; Dudenkova, Varvara V; Subochev, Pavel V; Turchin, Ilya V; Zagaynova, Elena V; Lukyanov, Sergey A; Shakhov, Boris E; Kamensky, Vladislav A

    2015-11-01

    The purpose of this study was to evaluate photobleaching of the genetically encoded photosensitizer KillerRed in tumor spheroids upon pulsed and continuous wave (CW) laser irradiation and to analyze the mechanisms of cancer cell death after the treatment. We observed the light-dose dependent mechanism of KillerRed photobleaching over a wide range of fluence rates. Loss of fluorescence was limited to 80% at light doses of 150 J/cm(2) and more. Based on the bleaching curves, six PDT regimes were applied for irradiation using CW and pulsed regimes at a power density of 160 mW/cm(2) and light doses of 140 J/cm(2) , 170 J/cm(2) and 200 J/cm(2). Irradiation of KillerRed-expressing spheroids in the pulsed mode (pulse duration 15 ns, pulse repetition rate 10 Hz) induced predominantly apoptotic cell death, while in the case of CW mode the cancer cells underwent necrosis. In general, these results improve our understanding of photobleaching mechanisms in GFP-like proteins and show the importance of appropriate selection of treatment mode for PDT with KillerRed. Representative fluorescence image of two KillerRed-expressing spheroids before and immediately after CW irradiation.

  11. Lactobacillus curtus sp. nov., isolated from beer in Finland.

    Science.gov (United States)

    Asakawa, Yuki; Takesue, Nobuchika; Asano, Shizuka; Shimotsu, Satoshi; Iijima, Kazumaru; Suzuki, Koji; Motoyama, Yasuo; Aizawa, Masayuki

    2017-09-12

    A Gram-stain-positive, catalase-negative and short-rod-shaped organism, designated VTT E-94560, was isolated from beer in Finland and deposited in the VTT culture collection as a strain of Lactobacillus rossiae. However, the results of 16S rRNA gene sequence analysis showed that VTT E-94560 was only related to Lactobacillus rossiae JCM 16176T with 97.0 % sequence similarity, lower than the 98.7 % regarded as the boundary for the species differentiation. Additional phylogenetic studies on the pheS gene, rpoA gene and 16S-23S rRNA internally transcribed spacer region further reinforced the taxonomically independent status of VTT E-94560 and its related Lactobacillus species including L. rossiae and Lactobacillus siliginis. Strain VTT E-94560 also exhibited several differences in its carbohydrate fermentation profiles from those related Lactobacillus species. In addition, DNA-DNA relatedness between VTT E-94560 and these two type strains was 4 % (L. rossiae JCM 16176T) and 12 % (L. siliginins JCM 16155T), respectively, which were lower than the 70 % cut-off for general species delineation, indicating that these three strains are not taxonomically identical at the species level. These studies revealed that VTT E-94560 represents a novel species, for which the name Lactobacillus curtus sp. nov. is proposed. The type strain is VTT E-94560T (=JCM 31185T).

  12. Surface morphology of thin lysozyme films produced by matrix-assisted pulsed laser evaporation (MAPLE)

    DEFF Research Database (Denmark)

    Purice, Andreea; Schou, Jørgen; Pryds, Nini;

    2007-01-01

    Thin films of the protein, lysozyme, have been deposited by the matrix-assisted pulsed laser evaporation (MAPLE) technique. Frozen targets of 0.3-1.0 wt.% lysozyme dissolved in ultrapure water were irradiated by laser light at 355 mn with a fluence of 2 J/cm(2). The surface quality of the thin ly...

  13. The spatial thickness distribution of metal films produced by large area pulsed laser deposition

    DEFF Research Database (Denmark)

    Pryds, Nini; Schou, Jørgen; Linderoth, Søren

    2007-01-01

    Thin films of metals have been deposited in the large-area Pulsed Laser Deposition (PLD) Facility at Riso National Laboratory. Thin films of Ag and Ni were deposited with laser pulses from an excimer laser at 248 nm with a rectangular beam spot at a fluence of 10 J/cm(2) on glass substrates of 12...

  14. Low-power laser stimulation of tissue engineered cartilage tissue formed on a porous calcium polyphosphate scaffold.

    Science.gov (United States)

    Gan, Lu; Tse, Carmen; Pilliar, Robert M; Kandel, Rita A

    2007-03-01

    Forming cartilage tissue in vitro that resembles native tissue is one of the challenges of cartilage tissue engineering. The aim of this study was to determine whether low-power laser stimulation would improve the formation of cartilage tissue in vitro. Bovine articular chondrocytes were seeded on the top surface of porous calcium polyphosphate substrates. After 2 days, laser stimulation was applied daily at a wavelength of 650 nm using a laser diode with energy densities of either 1.75 or 3 J/cm(2) for 4 weeks. Proteoglycan and collagen synthesis and matrix content were determined. Cartilage tissue morphology was evaluated histologically. Histologically, there was no difference in the appearance or cellularity of the tissues that formed in the presence or absence of laser stimulation at either dosage. There were no differences in DNA content between treated and untreated constructs and live-dead assay confirmed that this treatment was not toxic to the cells. Laser stimulation at 3 J/cm(2) enhanced matrix synthesis resulting in significantly more tissue formation than laser stimulation at 1.75 J/cm(2) or untreated cultures. Short exposures to low-power laser stimulation using a laser diode with 3 J/cm(2) dose improves cartilage tissue formation. (c) 2007 Wiley-Liss, Inc

  15. [The modulation of low-level laser on polarization of mouse bone marrow-derived macrophages].

    Science.gov (United States)

    Dai, Chen; Song, Jiwei; Liang, Zhuowen; Zhang, Qian; Zhang, Kun; Wang, Zhe; Hu, Xueyu

    2016-08-01

    Objective To investigate the influence of 810 nm low-level laser of different energy on the polarization of macrophages. Methods The macrophages were isolated from the bone borrow of BALB/c mice and cultured in macrophage colony stimulating factor (M-CSF) conditioned cultural medium. The expression of F4/80 was examined by flow cytometry for identification. After lipopolysaccharide-γ interferon (LPS-IFN-γ) induced polarization status in the macrophages, the mRNA expressions of inducible nitric oxide synthase (iNOS), arginase 1 (Arg1) and CD86 were detected by reverse transcription PCR, and the protein expressions of iNOS and Arg1 were tested by Western blotting. Thereafter, the M1 macrophages were exposed to 810 nm low-level laser of (1, 2, 3, 4) J/cm(2), and then the cell viability was evaluated by MTT assay; the expressions of iNOS and Arg1 were observed by immunofluorescent cytochemical staining; the mRNA and protein levels of iNOS and Arg1 were studied by reverse transcription PCR and Western blotting. Results Flow cytometry showed that the percentage of F4/80 positive cells cultured with M-CSF conditioned medium was 99.9%. The mRNA and protein levels of iNOS and CD86 in macrophages were both significantly raised after induction by LPS-IFN-γ. Compared with the control cells, the viability of M1 cells significantly decreased when the energy of the low-level laser exposure was 4 J/cm(2), while the viability remained unchanged when the energy was 1, 2 or 3 J/cm(2). Immunocytochemistry revealed that the percentage of Arg1 positive cells that represent M2 macrophages was not significantly different from the control group when the irradiation dose was 1 or 2 J/cm(2), however, the Arg1 positive cells significantly increased and the iNOS positive cells that represent M1 macrophages significantly decreased when the irradiation dose was 3 or 4 J/cm(2). When the irradiation dose was 1 or 2 J/cm(2), the mRNA and protein levels of iNOS and Arg1 remained unchanged

  16. In vitro study of cell death with 5-aminolevulinic acid based photodynamic therapy to improve the efficiency of cancer treatment

    Science.gov (United States)

    Firdous, S.; Nawaz, M.; Ikram, M.; Ahmed, M.

    2012-03-01

    Photodynamic therapy (PDT) is a kind of photochemo therapeutic treatment that exerts its effect mainly through the induction of cell death. Distinct types of cell death may be elicited by different PDT regimes. In this study, efforts are underway to optimize PDT protocols for improved efficacy and combination of all three PDT mechanisms involved in the different human carcinomas cell narcosis. Our in vitro cell culture experiments with 5-aminolevulanic acid (ALA) a clinically approved photiosensitizer (PS) and 635 nm laser light have yielded promising results, as follow: (1) (human cervical cancer (HeLa) cell line incubated, for 18 h, with 30 μg/ml of 5-ALA, treated with laser light dose of 50 J/cm2 can produce 85% of cell killing (2) human larynx carcinoma (Hep2c) cell line incubated, for 7 h, with 55 μg/ml of 5-ALA, treated with laser light dose of 85 J/cm2 can produce 75% of cell killing (3) human liver cancer (HepG2) cell line incubated, for 22-48 h, with 262 μg/ml of 5-ALA, treated with laser light dose of 120 J/cm2 can produce 95% of cell killing (4) human muscle cancer (RD) cell line incubated, for 47 h, with 250 μg/ml of 5-ALA, treated with laser light dose of 80 J/cm2 can produce 76% of cell killing (5) Human embryonic kidney (HEK293T) cell line incu-bated, for 18 h, with 400 μg/ml of 5-ALA, treated with laser light dose of 40 J/cm2 can produce 82% of cell killing confirming the efficacy of photodynamic therapy.

  17. Brachybacterium aquaticum sp. nov., a novel actinobacterium isolated from seawater.

    Science.gov (United States)

    Kaur, Gurwinder; Kumar, Narender; Mual, Poonam; Kumar, Anand; Kumar, Rajendran Mathan; Mayilraj, Shanmugam

    2016-11-01

    A pale-yellowish bacterium, strain KWS-1T, was isolated from seawater during a study of the bacterial diversity of the marine environment of the Kanyakumari coastal region of the Bay of Bengal, India, and was studied by using a polyphasic taxonomic approach. Strain KWS-1T had morphological and chemotaxonomic properties (cell-wall diamino acid, menaquinone and fatty acid profile) consistent with its classification in the genus Brachybacterium. Phylogenetic analysis of the 16S rRNA gene sequence showed that strain KWS-1T was related most closely to Brachybacterium paraconglomeratum JCM 17781T, followed by Brachybacterium saurashtrense DSM 23186T, Brachybacterium gingengisoli JCM 19356T, Brachybacterium faecium JCM 11609T and Brachybacterium conglomeratum JCM 11608T (98.45, 98.24, 98.12, 98.10 and 98.10 % similarity, respectively), whereas the sequence similarity values with respect to the other Brachybacterium species with validly published names were between 97.4 and 94.2 %. However, the DNA-DNA hybridization values between strain KWS-1T and the five most closely related species were less than the threshold value for species discrimination. The major lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and phosphatidylserine and the major quinone was menaquinone MK-7. The DNA G+C content of strain KWS-1T was 71.8 mol%. The above data in combination with the phenotypic distinctiveness of strain KWS-1T from other reference strains clearly indicate that the strain represents a novel species, for which the name Brachybacterium aquaticum sp. nov. is proposed. The type strain is KWS-1T (=MTCC 11836T=DSM 28796T=JCM 30059T).

  18. Antimicrobial action from a novel porphyrin derivative in photodynamic antimicrobial chemotherapy in vitro.

    Science.gov (United States)

    Latief, Miftahul Akhyar; Chikama, Taiichiro; Shibasaki, Momoko; Sasaki, Takaaki; Ko, Ji-Ae; Kiuchi, Yoshiaki; Sakaguchi, Takemasa; Obana, Akira

    2015-01-01

    Efforts to identify improved treatments for corneal infection include the development of photodynamic antimicrobial chemotherapy (PACT). We evaluated the antimicrobial effect of PACT with a novel porphyrin derivative, TONS 504, and a novel light system on methicillin-sensitive Staphylococcus aureus (MSSA) and methicillin-resistant Staphylococcus aureus (MRSA). Bacteria were irradiated with a light-emitting diode (LED) at energies of 10, 20, or 30 J/cm(2) in the presence of various concentrations of TONS 504. Bacterial viability was assessed at 30 min and 24 h after irradiation by determination of colony formation on agar plates. PACT inhibited the growth of both MSSA and MRSA as early as 30 min after light exposure. Complete inhibition of bacterial growth was apparent at 24 h after irradiation at a TONS 504 concentration of 1 mg/L and LED energies of ≥10 J/cm(2) or a TONS 504 concentration of 0.5 mg/L and LED energies of ≥20 J/cm(2) for MSSA, and at a TONS 504 concentration of 10 mg/L and LED energies of ≥10 J/cm(2) or of a TONS 504 concentration of 1 mg/L and LED energies of ≥20 J/cm(2) for MRSA. Bacterial growth was unaffected by TONS 504 in the absence of irradiation or by irradiation in the absence of TONS 504. Our results thus demonstrate the antimicrobial efficacy of PACT with TONS 504 and a LED against both MSSA and MRSA in vitro, and they therefore provide a basis for further investigation of this system as a potential treatment for corneal infection.

  19. Influence of the fractioned irradiation energy in the phototherapy with low intensity laser on the growth of human dental pulp fibroblasts

    Science.gov (United States)

    Meneguzzo, D. T.; Eduardo, C. P.; Ribeiro, M. S.; Marques, M. M.

    2008-03-01

    Laser phototherapy has proven to improve treatment of several pathologies in dentistry. The aim of the present study was to analyze the low power laser phototherapy effects comparing multiple irradiations with the same total energy at once. This in vitro study focuses on the biostimulation of cellular growth of pulp fibroblasts (FP5 cell lineage). The cells were grown in Dulbecco's Modified Eagle's (DME) medium with either 5% (nutritional deficit) or 10% fetal bovine serum (FBS). Laser irradiation was carried out with diode lasers with the following parameters: 685 nm, 40 mW, spot size 0.019 cm2. The groups were: G1(6.3J/cm2, 3 s, 0.12J), G2 (12.6J/cm2, 6 s, 0.24J), G3 (18.9J/cm2, 9 s, 0.36J), G4 (2 irradiations of 6.3J/cm2, 0.24J), G5 (3 irradiations of 6.3J/cm2, 0.36J), G6 (5% SFB, negative control, without irradiation), and G7 (10% SFB, positive control, without irradiation). On groups G4 and G5 the irradiation was performed with 6h-intervals. For growth analysis, the MTT test was used 24 hours after the last irradiation. The data from spectrophotometer were analyzed by ANOVA followed by the Tukey's test. The groups submitted to multiple irradiations presented significantly higher cell growth than the groups with single irradiation. This cell growth was similar to that of positive control group. The laser phototherapy with multiple irradiations is more effective on cellular growth.

  20. Sphaerisporangium dianthi sp. nov., an endophytic actinomycete isolated from a root of Dianthus chinensis L.

    Science.gov (United States)

    Xing, Jia; Liu, Chongxi; Zhang, Yuejing; He, Hairong; Zhou, Ying; Li, Lianjie; Zhao, Junwei; Liu, Shuanghe; Wang, Xiangjing; Xiang, Wensheng

    2015-01-01

    A novel actinomycete, designated strain NEAU-CY18(T), was isolated from the root of a Chinese medicinal plant Dianthus chinensis L and subjected to a polyphasic taxonomic study. The novel strain was found to develop spherical sporangia with non-motile spores on aerial mycelium. The cell-wall peptidoglycan was found to contain meso-diaminopimelic acid. The whole-cell sugars were identified as madurose, mannose, ribose, galactose and glucose. The phospholipid profile was found to contain diphosphatidylglycerol, phosphatidylmethylethanolamine, phosphatidylethanolamine, hydroxy-phosphatidylmethylethanolamine, phosphatidylglycerol, phosphatidylinositol, phosphatidylinositol mannosides and an unidentified phospholipid. The predominant menaquinones were identified as MK-9(H4), MK-9(H2) and MK-9(H6). The major fatty acids were identified as C17:0 10-methyl, iso-C16:0 and C16:0. EzTaxon-e analysis of the 16S rRNA gene sequence indicated that the strain belongs to the genus Sphaerisporangium and was most closely related to Sphaerisporangium cinnabarinum JCM 3291(T) (98.9 %) and Sphaerisporangium melleum JCM 13064(T) (98.3 %). Phylogenetic analysis based on the 16S rRNA gene sequence indicated that strain NEAU-CY18(T) forms a monophyletic clade with S. cinnabarinum JCM 3291(T), an association that was supported by a bootstrap value of 97 % in the neighbour-joining tree and also recovered with the maximum-likelihood algorithm. Comparisons of some phenotypic properties and low DNA-DNA relatedness values enabled the strain to be differentiated from S. cinnabarinum JCM 3291(T) and S. melleum JCM 13064(T). Therefore, it is concluded that strain NEAU-CY18(T) represents a novel Sphaerisporangium species, for which the name Sphaerisporangium dianthi sp. nov. is proposed. The type strain is NEAU-CY18(T) ( = CGMCC 4.7132(T) = DSM 46736(T)).

  1. Characterization of the Lactobacillus casei group based on the profiling of ribosomal proteins coded in S10-spc-alpha operons as observed by MALDI-TOF MS.

    Science.gov (United States)

    Sato, Hiroaki; Torimura, Masaki; Kitahara, Maki; Ohkuma, Moriya; Hotta, Yudai; Tamura, Hiroto

    2012-10-01

    The taxonomy of the members of the Lactobacillus casei group is complicated because of their phylogenetic similarity and controversial nomenclatural status. In this study, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) of ribosomal proteins coded in the S10-spc-alpha operon, termed S10-GERMS, was applied in order to classify 33 sample strains belonging to the L. casei group. A total of 14 types of ribosomal protein genes coded in the operon were first sequenced from four type strains of the L. casei group (L. casei JCM 1134(T), L. paracasei subsp. paracasei JCM 8130(T), L. paracasei subsp. tolerans JCM 1171(T), and L. rhamnosus JCM 1136(T)) together with L. casei JCM 11302, which is the former type strain of 'L. zeae'. The theoretical masses of the 14 types of ribosomal proteins used as biomarkers were classified into five types and compiled into a ribosomal protein database. The observed ribosomal proteins of each strain, identified by MALDI-TOF MS, were categorized into types based on their masses, summarized as ribosomal protein profiles, and they were used to construct a phylogenetic tree. The 33 sample strains, together with seven genome-sequenced strains, could be classified into four major clusters, which coincided precisely with the taxa of the (sub)species within the L. casei group. Three "ancient" strains, identified as L. acidophilus and L. casei, were correctly re-identified as L. paracasei subsp. paracasei by S10-GERMS. S10-GERMS would thus appear to be a powerful tool for phylogenetic characterization, with considerable potential for management of culture collections. Copyright © 2012 Elsevier GmbH. All rights reserved.

  2. Talaporfin-mediated photodynamic therapy for peritoneal metastasis of gastric cancer in an in vivo mouse model: drug distribution and efficacy studies.

    Science.gov (United States)

    Kishi, Kentaro; Yano, Masahiko; Inoue, Masahiro; Miyashiro, Isao; Motoori, Masaaki; Tanaka, Koji; Goto, Kunihito; Eguchi, Hidetoshi; Noura, Shingo; Yamada, Terumasa; Ohue, Masayuki; Ohigashi, Hiroaki; Ishikawa, Osamu

    2010-02-01

    Photodynamic therapy (PDT) is a potential treatment for the peritoneal dissemination of gastric cancer, because its cytotoxicity is limited to superficial lesions. We examined the accumulation of talaporfin in peritoneal metastatic nodules and determined the optimal laser condition for these nodules. We also evaluated the pathological response after therapy. We created a peritoneal metastasis model in nude mice using the MKN-45 EGFP cell line. We evaluated the accumulation of talaporfin in peritoneal metastatic nodules and normal organs by spectrophotometric analysis 2-8 h after i.p. talaporfin. To determine optimal PDT conditions, we treated metastatic nodules and the small intestine using multiple laser doses (2, 5, and 10 J/cm2, respectively). Accumulation of talaporfin was detected in metastatic nodules in higher intensities than in the small intestine. The fluorescent intensity of the peritoneal metastatic nodules gradually decreased dependent on the time interval between the laser treatment and talaporfin administration. Fluorescent intensity in the small intestine decreased more than in the metastatic nodules. The pathological response rates by dose were 52.5% at 2 J/cm2, 43.2% at 5 J/cm2, and 64.4% at 10 J/cm2, respectively, when the laser treatment was used 2 h after talaporfin administration, whereas at 4 h, they were 20.8, 25.5, and 26.2%, respectively. Finally, the recommended treatment conditions were considered to be a 2 J/cm2 laser dose and a 4-h interval in terms of toxicity. Talaporfin-mediated PDT may be an effective treatment modality for patients with advanced gastric adenocarcinoma and metastatic peritoneal nodules.

  3. Influences of infrared irradiation on human epidermal melanocytes%红外线照射对人表皮黑素细胞影响的研究

    Institute of Scientific and Technical Information of China (English)

    张悦; 赵广; 孟如松; 宋文婷; 邵丽芳; 牛建荣

    2012-01-01

    目的 探讨红外线(infrared,JR)照射促进体外培养的正常人表皮黑素细胞的酪氨酸酶活性及黑素含量的作用,寻找IR照射的最佳剂量.方法 将体外培养的正常人表皮黑素细胞分别给予不同的红外线剂量:0 J/cm2(对照组)、20 J/cm2、60 J/cm2、80 J/cm2、100 J/cm2、140 J/cm2、240 J/cm2、320 J/cm2,采用四甲基偶氮唑蓝(MTT)法选择最佳剂量并以此作为照射条件,连续3d,检测黑素细胞的酪氨酸酶活性、酪氨酸酶活性增长率、黑素含量、红外线照射对黑素细胞影响率以及细胞周期.结果 红外线照射的最佳剂量为80 J/cm2,此照射下的酪氨酸酶活性0.3601±0.0301,高于对照组0.3114±0.0341 (P< 0.05),酪氨酸酶活性增长率为15.64%.照射组的黑素细胞含量为0.2748±0.0243,高于对照组0.2325±0.0254(P<0.05),红外线照射对黑素细胞黑素含量影响率18.19%.细胞周期检测结果显示,G1细胞比例明显低于对照组(P<0.01),G2期和S期细胞比例较对照组增加(P<0.05).结论 80 J/cm2是IR照射的理想剂量,可以增加黑素细胞的黑素含量,提高酪氨酸酶活性,促进黑素细胞分化增殖.%Objective To observe the increasing effect of infrared irradiation on tyrosinase activity and melanin content in cultured normal human epidermal melanocytes in vitro and to explore the optimal dose of infrared irradiation.Methods Epidermal melanocytes were isolated from normal human foreskin tissue,and subjected to primary culture.Methyl thiazolyl tetrazolium (MTT) assay was performed to evaluate the effect of different doses(0,20,60,80,100,140,240,320 J/cm2)of infrared light on the proliferation of melanocytes and to select the optimal irradiation dose.Then,melanocytes were irradiated with infrared light at the optimal dose for 3 consecutive days followed by the determination of tyrosinase activity,melanin content,and cell cycle via dopa oxidation assay,NaOH solubilization method and flow cytometry

  4. Effects of lower fluence pulsed dye laser irradiation on production of collagen and the mRNA expression of collagen relative gene in cultured fibroblasts in vitro

    Institute of Scientific and Technical Information of China (English)

    YU Hai-yan; CHEN Da-fang; WANG Qi; CHENG Hao

    2006-01-01

    Background Lower fluence of 585-nm flashlamp-pumped pulsed dye laser has been successfully used as a nonablative technique in the treatment of wrinkles. The objective of this study was to evaluate the effect of the pulsed dye laser (585 nm) on the production of collagen and the mRNA expression of collagen related gene in fibroblasts in vitro.Methods Cultured fibroblasts were treated with a 585-nm flashlamp-pumped pulsed dye laser ( fluence 3 J/cm2,4 J/cm2, spot size 7 mm, pulse duration 450 μs). The production of collagen and the mRNA expression of transforming growth factor (TGF)-β1, SMAD2, SMAD3, SMAD4, SMAD7 and type I procollagen α1, α2 in fibroblasts were investigated by colorimetry or real time polymerase chain reaction.Results The production of collagen was significantly up-regulated after treatment with a 585-nm flashlamp-pumped pulsed dye laser with a fluence of 3 J/cm2 (P <0.001). The mRNA expression of TGF- β1,SMAD2, SMAD3, SMAD4, SMAD7 and procollagen I was significantly up-regulated after treatment with a 585-nm flashlamp-pumped pulsed dye laser with a fluence of 3 J/cm2 (P <0.001). No significant difference of mRNA expression of SMAD2, SMAD3, SMAD4, SMAD7 and type I procollagen was found between controls and fibroblasts treated with pulsed dye laser with a fluence of 4 J/cm2 (P >0.05).Conclusions Lower fluence (3 J/cm2) pulsed dye laser increased the collagen production in fibroblasts by up-regulating TGF-β1, SMAD2, SMAD3, SMAD4, SMAD7 and type I procollagen mRNA expression. These may be the reason it can be effectively used in the treatment of wrinkles.

  5. The Effects of Intense Pulsed Light and 5-aminolevulinic Acid on the Cultured B16 Murine Melanoma Cells%强脉冲光及5-氨基酮戊酸对小鼠B16黑素瘤细胞的作用

    Institute of Scientific and Technical Information of China (English)

    陈鹏; 蒋献; 魏大鹏; 李利

    2010-01-01

    目的 研究强脉冲光(IPL)及5-氨基酮戊酸(5-ALA)对小鼠B16黑素瘤细胞的影响.方法 以小鼠B16黑素瘤细胞为实验对象,分为阴性对照组(不加5-ALA,未辐射)、UVA阳性对照组(3、4、5 J/cm~2 UVA辐射)、5-ALA组(含5 mmol/L 5-ALA的细胞培养液孵育)、IPL组(20、30、40 J/cm~2 IPL辐射)及5-ALA+IPL组(含5 mmol/L 5-ALA的细胞培养液孵育细胞4 h后予20、30、40 J/cm~2 IPL辐射).辐射后1 d、2 d、3 d、4 d、5 d以噻唑蓝比色法(MTT)测定细胞增殖情况、NaOH溶解法测定黑素含量、氧化多巴反应法测定酪氨酸酶活性的变化.结果 5 mmol/L 5-ALA不影响B16黑素瘤细胞增殖、细胞黑素含量及酪氨酸酶活性.3~4 J/cm~2 UVA可促进B16黑素瘤细胞增殖,5 J/cm2时细胞增殖受到抑制.3~5 J/cm~2 UVA可提高酪氨酸酶活性、促进黑素合成,其作用呈剂量依赖性.IPL及5-ALA+IPL可降低黑素含量,5-ALA+IPL的作用较IPL更明显.IPL及5-ALA+IPL对细胞增殖及酪氨酸酶活性无明显影响.结论 UVA可提高酪氨酸酶活性,促进B16黑素瘤细胞的黑素合成.IPL及5-ALA+IPL可使B16黑素瘤细胞黑素合成减少,对细胞增殖、酪氨酸酶活性无影响.

  6. Selective photothermal ablation of tissue with a fiber-delivered Er:YAG laser

    Science.gov (United States)

    Pierce, Mark C.; Dickinson, Mark R.; Devlin, Hugh

    1999-06-01

    The feasibility of using laser-induced photoemission signals to distinguish between hard and soft biological tissues during photothermal ablation with a pulsed Er:YAG laser has been investigated. Time-resolved emission spectroscopy indicated a threshold fluence of approximately 35 J/cm2 to regularly initiate photoemission from dental enamel, while no emission was detected from porcine muscle tissue with incident laser fluences of up to approximately 140 J/cm2. The delay time of an emission signal with respect to the incident, ablative Er:YAG laser pulse was found to decrease from approximately 150 microseconds near the emission threshold fluence to approximately 60 microseconds at the highest fluence level used. Optical multichannel analyzer spectroscopy of Er:YAG irradiated enamel demonstrated that photoemissions typically consisted of a broad, continuous background in the visible region, with superimposed peaks arising from the presence of elements including calcium, characteristic of plasma emission either from the sample surface or emission plume.

  7. The Graphene Oxide Polymer Composites with High Breakdown Field Strength and Energy Storage Ability

    Science.gov (United States)

    Li, Yang; Hu, Jun; He, Jinliang; Gao, Lei

    The crystalline structure of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) is strongly related with its breakdown characteristic and energy storage capability. A graphene oxide (GO) polymer composite, making use of the specific interaction between GO and PVDF-HFP that can induce the formation of β-phase when crystallizing from solution, was developed. The results indicate that the breakdown field strength of the composites with GO nanosheets can reach more than 350 MV/m with small variance. And the composites exhibit a moderate dielectric constant (>13) which can obtain a maximum energy storage density of near 10 J/cm3 and discharged 5 J/cm3. Besides GO can alter the crystalline structure of PVDF-HFP from the non-polar phase to the polar phase. As a result, the composites with GO can achieve the similar results by mechanical stretching and avoid the necking effect in stretching.

  8. Laser scattering measurement for laser removal of graffiti

    Science.gov (United States)

    Tearasongsawat, Watcharawee; Kittiboonanan, Phumipat; Luengviriya, Chaiya; Ratanavis, Amarin

    2015-07-01

    In this contribution, a technical development of the laser scattering measurement for laser removal of graffiti is reported. This study concentrates on the removal of graffiti from metal surfaces. Four colored graffiti paints were applied to stainless steel samples. Cleaning efficiency was evaluated by the laser scattering system. In this study, an angular laser removal of graffiti was attempted to examine the removal process under practical conditions. A Q-switched Nd:YAG laser operating at 1.06 microns with the repetition rate of 1 Hz was used to remove graffiti from stainless steel samples. The laser fluence was investigated from 0.1 J/cm2 to 7 J/cm2. The laser parameters to achieve the removal effectiveness were determined by using the laser scattering system. This study strongly leads to further development of the potential online surface inspection for the removal of graffiti.

  9. Desulfuromonas svalbardensis sp. nov. and Desulfuromusa ferrireducens sp. nov., psychrophilic, Fe(III)-reducing bacteria isolated from Arctic sediments, Svalbard

    DEFF Research Database (Denmark)

    Vandieken, Verona; Mussmann, Marc; Niemann, Helge

    2006-01-01

    . As alternatives to Fe(III), they reduced fumarate, S0 and Mn(IV). Based on 16S rRNA gene sequence similarity, strain 112T was most closely related to Desulfuromonas acetoxidans (97.0 %) and Desulfuromonas thiophila NZ27T (95.5 %), and strain 102T to Malonomonas rubra Gra Mal 1T (96.3 %) and Desulfuromusa...... succinoxidans GylacT (95.9 %) within the Deltaproteobacteria. Strains 112T and 102T therefore represent novel species, for which the names Desulfuromonas svalbardensis sp. nov. (type strain 112T=DSM 16958T=JCM 12927T) and Desulfuromusa ferrireducens sp. nov. (type strain 102T=DSM 16956T=JCM 12926T) are proposed....

  10. 0.532-μm laser conditioning of HfO2/SiO2 third harmonic separator fabricated by electron-beam evaporation

    Institute of Scientific and Technical Information of China (English)

    Dawei Li; Yuan'an Zhao; Jianda Shao; Zhengxiu Fan; Hongbo He

    2008-01-01

    The 0.532-μm laser conditioning of HfO2/SiO2 third harmonic separator fabricated by electron-beam evaporation (EBE) was studied.The laser induced damage threshold (LIDT) of the separator determined by 1-on-1 test is 9.1 J/cm2 and it is 15.2 J/cm2 after laser conditioning determined by raster scanning.Two kinds of damage morphologies,taper pits and flat bottom pits,are found on the sample surface and they show different damage behaviors.The damage onset of taper pits does not change obviously and the laser conditioning effect is contributed to the flat bottom pits,which limits the application of laser conditioning.

  11. Multiscale simulations of polyurea-based dielectrics for capacitive energy storage

    Science.gov (United States)

    Dong, Rui; Ranjan, Vivek; Buongiorno Nardelli, Marco; Bernholc, Jerzy

    2014-03-01

    In high energy capacitors, bi-axially oriented polypropylene is the preferred the state-of-art low loss dielectric. However, its energy density only reaches 4 J/cm3 at 600 MV/m with 85% efficiency, while the recently synthesized polythiourea reaches 8 J/cm3 with 95% efficiency under the same conditions. Members of the aromatic polyurea family have also been reported to have similarly high energy densities. We have performed multiscale simulations to investigate several members of the polyurea/ polythiourea family, focusing on their structural and dielectric properties. Antiparallel packing of urea/thiourea units is found to be preferred energetically, but the energy surfaces are remarkably flat overall, with several distorted and disordered structures being energetically close. Nevertheless, microscopic geometries are found to be critical for the ionic response. Local disorder leads to larger permittivities, but also increased losses.

  12. Threshold for permanent refractive index change in crystalline silicon by femtosecond laser irradiation

    Science.gov (United States)

    Bachman, D.; Chen, Z.; Fedosejevs, R.; Tsui, Y. Y.; Van, V.

    2016-08-01

    An optical damage threshold for crystalline silicon from single femtosecond laser pulses was determined by detecting a permanent change in the refractive index of the material. This index change could be detected with unprecedented sensitivity by measuring the resonant wavelength shift of silicon integrated optics microring resonators irradiated with femtosecond laser pulses at 400 nm and 800 nm wavelengths. The threshold for permanent index change at 400 nm wavelength was determined to be 0.053 ± 0.007 J/cm2, which agrees with previously reported threshold values for femtosecond laser modification of crystalline silicon. However, the threshold for index change at 800 nm wavelength was found to be 0.044 ± 0.005 J/cm2, which is five times lower than the previously reported threshold values for visual change on the silicon surface. The discrepancy is attributed to possible modification of the crystallinity of silicon below the melting temperature that has not been detected before.

  13. ArF-excimer-laser annealing of 3C-SiC films—diode characteristics and numerical simulation

    Science.gov (United States)

    Mizunami, T.; Toyama, N.

    2003-09-01

    We fabricated Schottky barrier diodes using 3C-SiC films deposited on Si(1 1 1) by lamp-assisted thermal chemical vapor deposition and annealed with an ArF excimer laser. Improvement in both the reverse current and the ideality factor was obtained with 1-3 pulses with energy densities of 1.4- 1.6 J/cm2 per pulse. We solved a heat equation numerically assuming a transient liquid phase of SiC. The calculated threshold energy density for melting the surface was 0.9 J/cm2. The thermal effects of Si substrate on SiC film were also discussed. The experimental optimum condition was consistent the numerical simulation.

  14. Chlorophyll mediated photodynamic inactivation of blue laser on Streptococcus mutans

    Science.gov (United States)

    Astuti, Suryani Dyah; Zaidan, A.; Setiawati, Ernie Maduratna; Suhariningsih

    2016-03-01

    Photodynamic inactivation is an inactivation method in microbial pathogens that utilize light and photosensitizer. This study was conducted to investigate photodynamic inactivation effects of low intensity laser exposure with various dose energy on Streptococcus mutans bacteria. The photodynamic inactivation was achieved with the addition of chlorophyll as photosensitizers. To determine the survival percentage of Streptococcus mutans bacteria after laser exposure, the total plate count method was used. For this study, the wavelength of the laser is 405 nm and variables of energy doses are 1.44, 2.87, 4.31, 5.74, 7.18, and 8.61 in J/cm2. The results show that exposure to laser with energy dose of 7.18 J/cm2 has the best photodynamic inactivation with a decrease of 78% in Streptococcus

  15. Development and evaluation of an optical fibre-based helium–neon laser irradiation system for tissue regeneration: A pilot study

    Indian Academy of Sciences (India)

    Vijendra Prabhu; B S Satish Rao; B Nageshwara Rao; B Kiran Aithal; B Satish Shenoy; K K Mahato

    2010-12-01

    Low level laser therapy is being extensively used to treat various medical ailments including wound healing. In the present study, an optical fibre-based helium–neon (He–Ne) laser irradiation system was designed, developed and evaluated for optimum tissue repair on mice excision wounds. Circular wounds of 15 mm diameter were created on the dorsum of animals and single exposure of uniformly distributed laser beam was administered at 1, 2 and 3 J/cm2 to the respective test groups with suitable controls. Progression of healing was monitored by measuring wound contraction and mean healing time. Significant reduction in wound size and mean healing time ( < 0.001) were observed in the test groups for the laser dose of 2 J/cm2 compared to the unilluminated controls, suggesting the suitability of this dose.

  16. Incongruent transfer in laser deposition of FeSiGaRu thin films

    Science.gov (United States)

    van de Riet, E.; Kools, J. C. S.; Dieleman, J.

    1993-06-01

    The laser ablation and deposition of FeSiGaRu is studied. The deposited thin films are analyzed with Auger electron spectroscopy and Rutherford backscattering spectrometry. It is found that the gallium and ruthenium content of the thin films is strongly dependent on the laser fluence. At high laser fluences (6 J/cm2) the thin films are depleted of gallium due to preferential sputtering of the gallium atoms from the thin film. Near the threshold fluence (1.9 J/cm2) the films contain an excess of gallium due to preferential evaporation of gallium from the target. The latter conclusions are based on time-of-flight studies of ablated atoms and ions and on measurements of the atoms that are sputtered from the substrate by the incoming flux.

  17. Single- and multi-pulse formation of surface structures under static femtosecond irradiation

    Science.gov (United States)

    Guillermin, M.; Garrelie, F.; Sanner, N.; Audouard, E.; Soder, H.

    2007-07-01

    Femtosecond surface structure modifications are investigated under irradiation with laser pulses of 150 fs at 800 nm, on copper and silicon. We report sub-wavelength periodic structures formation (ripples) with a periodicity of 500 nm for both materials. These ripples are perpendicular to the laser polarization and can be obtained with only one pulse. The formation of these ripples corresponds to a fluence threshold of 1 J/cm 2 for copper and 0.15 J/cm 2 for silicon. We find several morphologies when more pulses are applied: larger ripples parallel to the polarization are formed with a periodicity of 1 μm and degenerate into a worm-like morphology with a higher number of pulses. In addition, walls of deep holes also show sub-wavelength and large ripples.

  18. Particle Formation from Pulsed Laser Irradiation of SootAggregates studied with scanning mobility particle sizer, transmissionelectron microscope and near-edge x-ray absorption fine structure.

    Energy Technology Data Exchange (ETDEWEB)

    Michelsen, Hope A.; Tivanski, Alexei V.; Gilles, Mary K.; vanPoppel, Laura H.; Dansson, Mark A.; Buseck, Peter R.; Buseck, Peter R.

    2007-02-20

    We investigated the physical and chemical changes induced in soot aggregates exposed to laser radiation using a scanning mobility particle sizer, a transmission electron microscope, and a scanning transmission x-ray microscope to perform near-edge x-ray absorption fine structure spectroscopy. Laser-induced nanoparticle production was observed at fluences above 0.12 J/cm(2) at 532 nm and 0.22 J/cm(2) at 1064 nm. Our results indicate that new particle formation proceeds via (1) vaporization of small carbon clusters by thermal or photolytic mechanisms, followed by homogeneous nucleation, (2) heterogeneous nucleation of vaporized carbon clusters onto material ablated from primary particles, or (3) both processes.

  19. The photobiomodulation in the bone repair after radiotherapy: experimental study in rats

    Science.gov (United States)

    Freire, M. R. S.; Almeida, D.; Santos, J. N.; Sarmento, V. A.

    2010-02-01

    This research evaluated the effect of the GaAlAs lasertherapy at the healing of surgical wounds produced in Wistar rats femurs few days before the beginning of the radiotherapy. For this, an orifice was artificially produced in the femur bone of the rats and they had been submitted to an external radiotherapy with a radioactive source of cobalt in the dosage of 3000 cGys. The experimental group received additionally seven sessions of 780 nm, 40 mW, 100 J/cm2 or 5 J/cm2 in four points around the surgical wound, at each 48 h, initiated at the day of the surgery. These animals had been sacrificed in three and five weeks. The results show that the number of osteocites (p< 0,0001) and Harvers channels (p< 0,0001) were significantly larger in the groups that had been radiated with laser during the experiment.

  20. Janibacter hoylei sp. nov., Bacillus isronensis sp. nov. and Bacillus aryabhattai sp. nov., isolated from cryotubes used for collecting air from the upper atmosphere.

    Science.gov (United States)

    Shivaji, S; Chaturvedi, Preeti; Begum, Zareena; Pindi, Pavan Kumar; Manorama, R; Padmanaban, D Ananth; Shouche, Yogesh S; Pawar, Shrikant; Vaishampayan, Parag; Dutt, C B S; Datta, G N; Manchanda, R K; Rao, U R; Bhargava, P M; Narlikar, J V

    2009-12-01

    Three novel bacterial strains, PVAS-1(T), B3W22(T) and B8W22(T), were isolated from cryotubes used to collect air samples at altitudes of between 27 and 41 km. Based on phenotypic characteristics, chemotaxonomic features, DNA-DNA hybridization with the nearest phylogenetic neighbours and phylogenetic analysis based on partial 16S rRNA gene sequences (PVAS-1(T), 1196 nt; B3W22(T), 1541 nt; B8W22(T), 1533 nt), the three strains were identified as representing novel species, and the names proposed are Janibacter hoylei sp. nov. (type strain PVAS-1(T) =MTCC 8307(T) =DSM 21601(T) =CCUG 56714(T)), Bacillus isronensis sp. nov. (type strain B3W22(T) =MTCC 7902(T) =JCM 13838(T)) and Bacillus aryabhattai sp. nov. (type strain B8W22(T) =MTCC 7755(T) =JCM 13839(T)).

  1. Metal cathode patterning for OLED by nanosecond pulsed laser ablation

    Institute of Scientific and Technical Information of China (English)

    LIU Chen; ZHU Guang-xi; LIU De-ming

    2006-01-01

    In this paper,nanosecond pulsed laser is introduced to selectively ablate away indium tin oxide film and metal film without destroying the underlying layers for fabricating organic light-emitting diodes. By varying density of energy, pulse number and width of the laser, the influence on morphology of the laser trenches of indium tin oxide and metal films are investigated. It is presented that uniform ablation trench can be obtained with 16 laser pulses at 0.15 J/cm2 for aluminum film and 10 laser pulses at 0.65 J/cm2 for indium tin oxide film. It is found that the characteristics of the organic light-emitting diodes prepared with laser ablation are almost the same as those of that prepared with conventional patterning method.

  2. A study of ultrafast electron diffusion kinetics in ultrashort-pulse laser ablation of metals

    Institute of Scientific and Technical Information of China (English)

    Yang Jian-Jun; Liu Wei-Wei; Zhu Xiao-Nong

    2007-01-01

    Temperature dependence of the electron diffusion in metallic targets, where the electron-electron collision is the dominant process, is investigated with the help of an extended two-temperature model. In sharp contrast to the low electron temperature case, where only the electron-phonon collisions are commonly considered, the electron diffusion process underlying the high electron temperatures evolves dramatically different in both temporal and spatial domains.Calculated results of the ablation yield at different pulse durations are presented for a copper plate impinged by ultrashort laser pulses with energy fluences ranging from 0.1 J/cm2 to 10 J/cm2. The excellent agreement between the simulation results and the experimental data indicates the significant role of electron-electron collisions in material ablations using intense ultrashort laser pulses.

  3. Fluoroquinolone Resistance in Salmonella and the Utility of Pefloxacin Disk Diffusion [corrected].

    Science.gov (United States)

    Fang, Ferric C

    2015-11-01

    Fluoroquinolone resistance is a serious and increasingly common problem in Salmonella. Two companion studies in this issue of the Journal of Clinical Microbiology (E. Deak, R. Skov, J. A. Hindler, and R. M. Humphries, J Clin Microbiol 53:3405-3410, 2015, http://dx.doi.org/10.1128/JCM.01393-15; R. Skov, E. Matuschek, M. Sjölund-Karlsson, J. Åhman, A. Petersen, M. Stegger, M. Torpdahl, and G. Kahlmeter, J Clin Microbiol 53:3411-3417, 2015, http://dx.doi.org/10.1128/JCM.01287-15) provide data to support the use of pefloxacin disk diffusion as a convenient and inexpensive surrogate laboratory method to detect fluoroquinolone resistance in Salmonella when the direct measurement of fluoroquinolone MICs is not feasible [corrected]. Recently updated CLSI and EUCAST susceptibility breakpoints will help to optimize clinical outcomes and reduce the likelihood of emergent resistance.

  4. Femtosecond laser-induced subwavelength ripples formed by asymmetrical grating splitting

    Science.gov (United States)

    Feng, Pin; Jiang, Lan; Li, Xin; Zhang, Kaihu; Shi, Xuesong; Li, Bo; Lu, Yongfeng

    2016-05-01

    The formation process and mechanism of subwavelength ripples were studied upon irradiation of ZnO by a femtosecond laser (800 nm, 50 fs, 1 kHz). An abnormally asymmetrical grating-splitting phenomenon was discovered. At relatively high laser fluences (F = 0.51-0.63 J/cm2), near-wavelength ripples were split asymmetrically to create subwavelength laser-induced periodic surface structures (LIPSS) with dual gaps (˜230 nm and ˜430 nm) on the primary grooves. At relatively low laser fluences (F = 0.4-0.45 J/cm2), near-wavelength ripples were split symmetrically, leading to the formation of uniform subwavelength structures with a period of ˜340 nm. The splitting phenomena are related to the varying laser beam dose induced by the overlapping during line scanning. The two grating-splitting types further imply that the dominated mechanism for LIPSS formation may be changed under different processing conditions.

  5. Impact strength of GX8CrNi12, GX5CrNi18-9 and GX5CrNiMo19-11-2 cast steel at - 30 °C

    Directory of Open Access Journals (Sweden)

    B. Kalandyk

    2016-10-01

    Full Text Available The results of impact tests carried out at - 30 °C on cast alloyed GX8CrNi12, GX5CrNi18-9 and GX5CrNiMo19-11-2 steel grades are reported. It has been shown that at - 30 °C, the addition of 1 % Ni to cast GX8CrNi12 steel does not provide the required impact strength of 35 J/cm2. In contrast, other tested materials containing 8 ÷ 9 % Ni can easily reach exceeding 50 J/cm2. Numerous non-metallic inclusions present in the microstructure of cast GX5CrNi-Mo19-11-2 steel resulting from, among others, the miscalculated refining process were found to be one of the main causes of reduced impact strength as compared to the cast GX5CrNi18-9 steel.

  6. Visualization of transient phenomena during the interaction of pulsed CO2 laser radiation with matter

    Science.gov (United States)

    Schmitt, R.; Hugenschmidt, Manfred

    1996-05-01

    Carbon-dioxide-lasers operating in the pulsed mode with energy densities up to several tens of J/cm2 and peak power densities in the multi-MW/cm2-range may cause fast heating and melting. Eventually quasi-explosive ejection, decomposition or vaporization of material can be observed. Surface plasmas are strongly influencing the energy transfer from the laser radiation field to any target. For optically transparent plastics, such as PMMA for example, only slowly expanding plasmas (LSC-waves) are ignited at fluences around 20 J/cm2, with a low level of self-luminosity. High brightness, supersonically expanding plasma jets (LSD-waves) are generated at the same fluences on glasses. Similar conditions were found for metals as well. From recordings with a high speed CCD-camera, interesting features concerning the initial plasma phases and temporal evolution were deduced. Additionally, information was obtained concerning the quasi explosive ejection of material for PMMA.

  7. SnET2: clinical update

    Science.gov (United States)

    Razum, Nicholas J.; Snyder, Albert B.; Doiron, Daniel R.

    1996-04-01

    Tin Ethyl Etiopurpurin, SnET2, is a synthetic chlorin analog presently in Phase-II/III clinical trials for the treatment of cutaneous cancers. Trials to date include the treatment of basal cell carcinomas, squamous cell carcinomas, breast adenocarcinomas metastatic to the chest wall and cutaneous Kaposi's sarcomas in AIDS patients. Results to date have shown significant clinical responses for drug doses between 1.0 mg/kg and 1.6 mg/kg, with the threshold for Kaposi's sarcoma being slightly higher than in other indications. Light doses from 100 J/cm2 to 300 J/cm2 were delivered from 24 to 72 hours post SnET2 infusion. Induced transient skin photosensitivity at the lower therapeutic doses has been mild, lasting approximately a week. Results of the Phase I and II trials are presented.

  8. Anti-tumor activities of a novel chlorin derivative for photodynamic therapy in vitro and in vivo

    Directory of Open Access Journals (Sweden)

    Li-Jun Zhang

    2015-01-01

    Full Text Available In this study, a novel photosensitizer meso-tetra (3-pyrrolidinomethyl-4-methoxyphenyl chlorin (TPMC was reported. It displays a characteristic long wavelength absorption peak at 656 nm and it shows a singlet oxygen quantum yield of 0.48. After light irradiation with 650 nm laser, it can kill Eca-109 and SMMC-7721 cells in vitro (25 mW/cm2, 1.2 to 3.6 J/cm2 and destroy Eca-109 tumor in nude mice (50 mW/cm2, 90 J/cm2. It has the perspective to be developed as a new anti-tumor drug in photodynamic therapy (PDT photodiagnosis, and deserves further investigation.

  9. Investigation of Laser-Induced Damage on Multi-Layer Dielectric Gratings

    Institute of Scientific and Technical Information of China (English)

    KONG Wei-Jin; SHEN Zi-Cai; SHEN Jian; SHAO Jian-Da; FAN Zheng-Xiu

    2005-01-01

    @@ We investigate mechanisms of laser induced damage thresholds (LIDTs) of multi-layer dielectric gratings (MDGs).It is found that the laser damage thresholds of MDGs and unstructured dielectric multi-layer coatings (the substrate of MDG) are 3.15J/cm2 and 9.32J/cm2, respectively, at 1064nm (12ns) with the Littrow angle 51.2°and the TEM00 mode. The laser-induced damage mechanism of multi-layer dielectric is presented with the analysis of the following factors: The dominant factor is the pollution on the corrugated surface, which is induced by the complex manufacture process of multi-layer dielectric gratings; another is the electric field distribution along the corrugated surface. The third reason is due to the reduction in stoichiometry of oxide films, resulting from the manufacture process of etching.

  10. Treatment of tattoos by Q-switched ruby laser. A dose-response study

    Energy Technology Data Exchange (ETDEWEB)

    Taylor, C.R.; Gange, R.W.; Dover, J.S.; Flotte, T.J.; Gonzalez, E.; Michaud, N.; Anderson, R.R. (Massachusetts General Hospital, Boston (USA))

    1990-07-01

    Tattoo treatment with Q-switched ruby laser pulses (694 nm, 40 to 80 nanoseconds) was studied by clinical assessment and light and electron microscopy. Fifty-seven blue-black tattoos or portions thereof (35 amateur and 22 professional) were irradiated with 1.5 to 8.0 J/cm2 at a mean interval of 3 weeks. Substantial lightening or total clearing occurred in 18 (78%) of 23 amateur tattoos and 3 (23%) of 13 professional tattoos in which the protocol was completed. Response was related to exposure dose. Scarring occurred in one case, and persistent confettilike hypopigmentation was frequent. Optimal fluence was 4 to 8 J/cm2. Clinicohistologic correlation was poor. Q-switched ruby laser pulses can provide an effective treatment for tattoos.

  11. Toughness enhancement in zirconium-tungsten-nitride nanocrystalline hard coatings

    Science.gov (United States)

    Dubey, P.; Srivastava, S.; Chandra, R.; Ramana, C. V.

    2016-07-01

    An approach is presented to increase the toughness (KIC) while retaining high hardness (H) of Zr-W-N nanocrystalline coatings using energetic ions bombardment. Tuning KIC and H values was made possible by a careful control over the substrate bias, i.e., the kinetic energy (Uk˜9-99 J/cm3) of the bombarding ions, while keeping the deposition temperature relatively low (200 oC). Structural and mechanical characterization revealed a maximum wear resistance (H/Er˜0.23) and fracture toughness (KIC˜2.25 MPa √{ m } ) of ZrWN coatings at Uk˜72 J/cm3. A direct Uk-microstructure-KIC-H relationship suggests that tailoring mechanical properties for a given application is possible by tuning Uk and, hence, ZrWN-coatings' microstructure.

  12. Surface finishing of ZnGeP2 single crystal by diamond tool turning method

    Science.gov (United States)

    Yue, Xiaobin; Xu, Min; Du, Wenhao; Chu, Chong

    2017-09-01

    In this work, diamond tool turning of vertical gradient freeze (VGF) grown single crystal ZnGeP2 (ZGP) was investigated. The flatness of machined ZGP surface was measured with a Zygo interferometry to be less than λ/10 and the roughness was measured with a Taloy profilermeter to be 0.7-0.9 nm. The laser-induced damage threshold was measured with a 2.07 μm wavelength pulsed laser to be >3 J/cm2.

  13. Multiset Rewriting and the Complexity of Bounded Security Protocols

    Science.gov (United States)

    2003-06-06

    Stanford University University of Pennsylvania Stanford, CA Philadelphia, PA jcm@cs.stanford.edu andre @cis.upenn.edu June 6, 2003 Abstract We formalize... Breton , NS, Canada, 24{26 June 2002. IEEE Computer Society Press. [BM93] J.-P. Banâtre and D. Le Metayer. Computing by multiset transformation. Com...187, Cape Breton , Nova Scotia, Canada, 2001. IEEE Computer Society Press. [Sch96] S. Schneider. Security properties and CSP. In IEEE Symp. Security

  14. Olsenella scatoligenes sp. nov., a 3-methylindole- (skatole) and 4-methylphenol- (p-cresol) producing bacterium isolated from pig faeces

    DEFF Research Database (Denmark)

    Li, Xiaoqiong; Jensen, Rikke Lassen; Højberg, Ole

    2015-01-01

    Olsenella with validly published names; Olsenella profusa DSM 13989T (93.6 %), Olsenella uli DSM 7084T (93.5 %) and Olsenella umbonata DSM 22620T (92.7 %). DNA–DNA relatedness values of strain SK9K4T with O. profusa, O. uli and O. umbonata were 28.3 %, 69.1% and 27.2 %, respectively. The genomic DNA G...... strain is SK9K4T (5JCM 19907T5DSM 28304T)....

  15. Immediate in vivo target-specific cancer cell death after near infrared photoimmunotherapy

    Directory of Open Access Journals (Sweden)

    Mitsunaga Makoto

    2012-08-01

    Full Text Available Abstract Background Near infrared (NIR photoimmunotherapy (PIT is a new type of cancer treatment based on a monoclonal antibody (mAb-NIR phthalocyanine dye, (IR700 conjugate. In vitro cancer-specific cell death occurs during NIR light exposure in cells previously incubated with mAb-IR700 conjugates. However, documenting rapid cell death in vivo is more difficult. Methods A luciferase-transfected breast cancer cell (epidermal growth factor receptor+, MDA-MB-468luc cells was produced and used for both in vitro and in vivo experiments for monitoring the cell killing effect of PIT. After validation of cytotoxicity with NIR exposure up to 8 J/cm2in vitro, we employed an orthotopic breast cancer model of bilateral MDA-MB-468luc tumors in female athymic mice, which subsequently received a panitumumab-IR700 conjugate in vivo. One side was used as a control, while the other was treated with NIR light of dose ranging from 50 to 150 J/cm2. Bioluminescence imaging (BLI was performed before and after PIT. Results Dose-dependent cell killing and regrowth was successfully monitored by the BLI signal in vitro. Although tumor sizes were unchanged, BLI signals decreased by >95% immediately after PIT in vivo when light intensity was high (>100 J/cm2, however, in mice receiving lower intensity NIR (50 J/cm2, tumors recurred with gradually increasing BLI signal. Conclusion PIT induced massive cell death of targeted tumor cells immediately after exposure of NIR light that was demonstrated with BLI in vivo.

  16. Enhanced energy storage and suppressed dielectric loss in oxide core-shell-polyolefin nanocomposites by moderating internal surface area and increasing shell thickness.

    Science.gov (United States)

    Fredin, Lisa A; Li, Zhong; Ratner, Mark A; Lanagan, Michael T; Marks, Tobin J

    2012-11-20

    Dielectric loss in metal oxide core/Al(2)O(3) shell polypropylene nanocomposites scales with the particle surface area. By moderating the interfacial surface area between the phases and using increasing shell thicknesses, dielectric loss is significantly reduced, and thus the energy stored within, and recoverable from, capacitors fabricated from these materials is significantly increased, to as high as 2.05 J/cm(3).

  17. Deep Impurity Band Silicon for Subbandgap Photodetection

    Science.gov (United States)

    2014-05-02

    melting ( PLM ) was carried out us- ing a 308 nm XeCl excimer laser producing a pulse with FWHM of ~25 ns and fluences between 1.7-1.8 J/cm2. The melt...compensation, illustrating how well matched are the boron and sulfur concen- tration depth profiles. Dopant profile evolution during PLM was modeled...measure this diffusive velocity gives us the ability to accurately predict the dopant profile that will result from future implantation and PLM

  18. Influence of energy density of different light sources on knoop hardness of a dual-cured resin cement

    Directory of Open Access Journals (Sweden)

    Evandro Piva

    2008-06-01

    Full Text Available The purpose of this study was to evaluate the Knoop hardness of a dual-cured resin-based luting cement irradiated with different light sources as well energy density through a ceramic sample. Three light-curing unit (LCUs were tested: tungsten halogen light (HAL, light-emitting diode (LED and xenon plasma-arc (PAC lamp. Disc-shaped specimens were fabricated from a resin-based cement (Enforce. Three energy doses were used by modifying the irradiance (I of each LCU and the irradiation time (T: 24 Jcm-2 (I/2x2T, 24 Jcm-2 (IxT and 48 Jcm-2 (Ix2T. Energy doses were applied through a 2.0-mm-thick ceramic sample (Duceram Plus. Three groups underwent direct irradiation over the resin cement with the different LCUs and a chemically-activated group served as a control. Thirteen groups were tested (n=10. Knoop hardness number (KHN means were obtained from cross-sectional areas. Two-way ANOVA and the Holm-Sidak method were used for statistical comparisons of activation mode and energy doses (a=5%. Application of 48 J.cm-2 energy dose through the ceramic using LED (50.5±2.8 and HAL (50.9±3.7 produced significantly higher KHN means (p<0.05 than the control (44.7±3.8. LED showed statistically similar performance to HAL. Only HAL showed a relationship between the increase of LCU energy dose and hardness increase.

  19. A Taxatetraene from Microbial Transformation of Sinenxan A

    Institute of Scientific and Technical Information of China (English)

    Jun Gui DAI; Lin YANG; Jun Ichi SAKAI; Masayoshi ANDO

    2005-01-01

    Sinenxan A [2α, 5α, 10β, 14β-tetraacetoxytaxa-4(20), 11-diene, 1] was biotransformed by a filamentous fungus, Aspergillus niger JCM 5546, and an unusual taxatetraene [2α,5α-acetoxytaxa-4(20), 10(11), 12(18), 13(14)-tetraene, 2], together with two known products,10β-deacetyl sinenxan A (3) and 10β, 14β-dideacetyl sinenxan A (4) were produced.

  20. HARD PAN I Test Series - Test and Instrumentation Plans. Volume 2. Instrumentation Plan

    Science.gov (United States)

    1976-11-01

    CMCMCMVOlOCMCM^-^-tOm CMCMCOCOCMCMlf) I I r— I 00 3 a; Lü LU LÜ LU CMco^ mvoP ^ooo» CMCMCMCMCMCMC^JCM O i— CM CO...O O O in vo r«> GO o> o OOOO oooo S S 8 ^-CMfO^- mvoP ^eooiOi— CM**) §r-^-i— ^r-^-r—i— i— i— <MCMCMCM

  1. BRC - MicrobeDB.jp | LSDB Archive [Life Science Database Archive metadata

    Lifescience Database Archive (English)

    Full Text Available switchLanguage; BLAST Search Image Search Home About Archive Update History Data ...10.18908/lsdba.nbdc01181-001.V002 Update History V1 10.18908/lsdba.nbdc01181-001.V001 - Description of data ...rains in JCM. About This Database Database Description Download License Update History of This Database Site Policy | Contact Us BRC - MicrobeDB.jp | LSDB Archive ...

  2. AcEST: DK948385 [AcEST

    Lifescience Database Archive (English)

    Full Text Available ype ATP synthase subunit E OS=Ignicoccus hospitalis (strain KIN4/I / DSM 18386 / ...Link to BlastX Result : Swiss-Prot sp_hit_id A8ABF5 Definition sp|A8ABF5|VATE_IGNH4 V-type ATP synthase subunit E OS=Ignicoccus hospi...talis (strain KIN4/I / DSM 18386 / JCM 14125) Align length 35 Score (bit) 32.3 E-va

  3. Pulsed UV laser light on Escherichia coli and Saccharomyces cerevisiae suspended in non-alcoholic beer

    Directory of Open Access Journals (Sweden)

    A Elikaei

    2011-05-01

    Full Text Available Background: The aim of this study was to investigate the effect of pulsed ultra-violet (UV irradiation on inactivation of beer spoilage microorganisms. UV irradiation is nowadays cost effective enough to compete with traditional biological, physical, and chemical treatment technologies and has become an alternative to such methods."nMaterial and Methods: Photoinactivation effects of pulsed UV laser with the wavelengths of 355 and 266 nm, which inactivate typical prokaryotic (Escherichia coli and eukaryotic (Saccharomyces cerevisiae microorganisms, were examined with different doses and exposure times."nResults: A dose of 100 J/cm2 of the 355 nm pulsed UV laser was able to reduce about 1 to 2 log (88.75% of E.coli with the population of 1.6×108 colony-forming units (CFU/ml, and 97% of 3.2×107, 3×106, 5.5×105, and 9×104 CFU/ml. In the case of 266 nm, more than 99% reduction in E. coli serial dilutions was inactivated, using 10 J/cm2 with exception of 7×104 CFU/ml which was not detected any bacterial growth using 5 J/cm2. In addition, 50, 40, and 20 J/cm2 energy were used successfully to inactivate S. cerevisiae at the populations of 5.4×106, 7×105, 5×104 and 4×103 CFU/ml, respectively."nAs a result, pulsed UV Laser with 266 nm was strong enough to inactivate a high titer of bacterial and yeast indicator standards suspended in non-alcoholic beer in comparison with 355nm doses."nConclusion: Results indicate that pulsed UV technology, in principle, is an attractive alternative to conventional methods for the inactivation of indicator microorganisms and has potential in irradiation of unpasteurized beer.

  4. Modeling the pulsed light inactivation of microorganisms naturally occurring on vegetable substrates.

    Science.gov (United States)

    Izquier, Adriana; Gómez-López, Vicente M

    2011-09-01

    Pulsed light (PL) is a fast non-thermal method for microbial inactivation. This research studied the kinetics of PL inactivation of microorganisms naturally occurring in some vegetables. Iceberg lettuce, white cabbage and Julienne-style cut carrots were subjected to increasing PL fluences up to 12J/cm(2) in order to study its effect on aerobic mesophilic bacteria determined by plate count. Also, sample temperature increase was determined by infrared thermometry. Survivors' curves were adjusted to several models. No shoulder but tail was observed. The Weibull model showed good fitting performance of data. Results for lettuce were: goodness-of-fit parameter RMSE=0.2289, fluence for the first decimal reduction δ=0.98±0.80J/cm(2) and concavity parameter p=0.33±0.08. Results for cabbage were: RMSE=0.0725, δ=0.81±0.23J/cm(2) and p=0.30±0.02; and for carrot: RMSE=0.1235, δ=0.39±0.24J/cm(2) and p=0.23±0.03. For lettuce, a log-linear and tail model was also suitable. Validation of the Weibull model produced determination coefficients of 0.88-0.96 and slopes of 0.78-0.99. Heating was too low to contribute to inactivation. A single low-energy pulse was enough to achieve one log reduction, with an ultrafast treatment time of 0.5ms. While PL efficacy was found to be limited to high residual counts, the achievable inactivation level may be considered useful for shelf-life extension.

  5. Over-expression of CXCR4, a stemness enhancer, in human blastocysts by low level laser irradiation

    Directory of Open Access Journals (Sweden)

    Mohammad Hossein Tahmasbi

    2013-09-01

    Full Text Available The key role of chemokine receptor CXCR4 in the maintenance of stemness property of stem cells has been shown recently. The low level laser irradiation (LLLI is being used currently in a wide variety of clinical cases as a therapeutic tool for wound healing, relieving pain and destroying tumor cells. The aim of this study was to evaluate the effect of LLLI mimicking low level laser therapy (LLLT on the expression level of CXCR4 gene a few hours after irradiation on human blastocysts. After the development of human embryos to the first grade blastocyst stage, they were irradiated with a low power Ga-Al-As laser at a continuous wavelength of 650 nm and a power output of 30 mW. The total RNA of the irradiated blastocysts and control groups were isolated in groups of 1x2 J/cm2, 2x2 J/cm2, 1x4 J/cm2 and 2x4 J/cm2 LLLI. Specific Real-Time PCR primers were designed to amplify all the two CXCR4 isoforms yet identified. RNA amplifications were done for all the groups. We showed for the first time that LLLI makes the human blastocysts to increase the expression level of CXCR4 a few hours after irradiation. Moreover, it was shown that two irradiation doses with one day interval can cause a significant increase in CXCR4 expression level in human blastocysts. This study revealed that LLLI could be a proliferation motivator for embryonic cell divisions through enhanced over-expression of CXCR4 level.

  6. Descriptions of Anaerotaenia torta gen. nov., sp. nov. and Anaerocolumna cellulosilytica gen. nov., sp. nov. isolated from a methanogenic reactor of cattle waste and reclassification of Clostridium aminovalericum, Clostridium jejuense and Clostridium xylanovorans as Anaerocolumna species.

    Science.gov (United States)

    Ueki, Atsuko; Ohtaki, Yoshimi; Kaku, Nobuo; Ueki, Katsuji

    2016-09-01

    Strictly anaerobic bacterial strains (FH052T and SN021T) belonging to clostridial cluster XIVa were isolated from a methanogenic reactor. Cells of the two strains were Gram-stain-positive, slender or curved rods producing terminal spores. The strains were slightly alkaliphilic. They fermented various carbohydrates including xylan and produced acetate, ethanol and H2. Strain SN021T decomposed cellulose. The genomic DNA G+C contents were 47.2 mol% for strain FH052T and 38.1 mol% for strain SN021T. The two strains had common cellular fatty acids such as C16 : 0, C16 : 0 dimethylacetal and C18 : 1ω7c dimethylacetal as major components. 16S rRNA gene sequence similarity between the two strains was 94.3 % and they shared closely related species such as Clostridium jejuense, Clostridium xylanovorans and Clostridium aminovalericum (92.6-95.7 % sequence similarity). Phenotypic and phylogenetic analyses suggested that these two isolates should be assigned to novel genera other than the genus Clostridium, and thus the genera Anaerotaenia gen. nov. and Anaerocolumna gen. nov. in the family Lachnospiraceae were proposed to accommodate them as Anaerotaenia torta gen. nov., sp. nov. for strain FH052T (=JCM 30820T=DSM 100431T) and Anaerocolumna cellulosilytica gen. nov., sp. nov. for strain SN021T (=JCM 30819T=DSM 100423T). For the three related Clostridium species, Anaerocolumna aminovalerica DSM 1283T (=JCM 11016T=ATCC 13725T) comb. nov., Anaerocolumna jejuensis HY-35-12T (=DSM 15929T=KCTC 5026T) comb. nov. and Anaerocolumna xylanovoransstrain HESP1T (=DSM 12503T=JCM 31057T) comb. nov. are proposed with emended descriptions of these species.

  7. Dactylosporangium solaniradicis sp. nov., a novel actinobacterium isolated from a root of tomato (Solanum lycopersicum L.).

    Science.gov (United States)

    Fan, Jianlong; Liu, Chongxi; Ma, Zhaoxu; Zhou, Shuyu; Li, Wenchao; Li, Jiansong; Chu, Liyang; Wang, Xiangjing; Xiang, Wensheng

    2016-07-01

    A novel actinobacterium, designated strain NEAU-FJL2(T), was isolated from a tomato root (Solanum lycopersicum L.) and characterised using a polyphasic approach. Morphological and chemotaxonomic properties of strain NEAU-FJL2(T) are consistent with the description of the genus Dactylosporangium. Finger-shaped sporangia were observed to form on short sporangiophores branching from the substrate hyphae. The cell wall peptidoglycan was found to contain meso- and 3-hydroxy-diaminopimelic acids; arabinose, mannose, rhamnose and xylose were found as whole-cell sugars. The phospholipid profile was found to consist of diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and phosphatidylinositol. The predominant menaquinones were identified as MK-9(H8) and MK-9(H6). The major fatty acids were identified as iso-C16:0, C16:1 ω7c and iso-C15:0. Phylogenetic analysis based on 16S rRNA gene sequences demonstrated that strain NEAU-FJL2(T) belongs to the genus Dactylosporangium, with Dactylosporangium sucinum JCM 19831(T) (99.3 % 16S rRNA gene sequence similarity), Dactylosporangium darangshiense JCM 17441(T) (99.2 %), Dactylosporangium fulvum JCM 5631(T) (98.9 %) and Dactylosporangium roseum JCM 3364(T) (98.8 %) as the nearest phylogenetic relatives. However, a combination of DNA-DNA hybridization results and some phenotypic characteristics demonstrated that strain NEAU-FJL2(T) can be distinguished from them. Consequently, it is proposed that strain NEAU-FJL2(T) represents a novel species of the genus Dactylosporangium, for which the name Dactylosporangium solaniradicis sp. nov. is proposed. The type strain is NEAU-FJL2(T) (=CGMCC 4.7302(T) = DSM 100814(T)).

  8. Efficacy of multiple exposure with low level He-Ne laser dose on acute wound healing: a pre-clinical study

    Science.gov (United States)

    Prabhu, Vijendra; Rao, Bola Sadashiva S.; Mahato, Krishna Kishore

    2014-02-01

    Investigations on the use of Low Level Laser Therapy (LLLT) for wound healing especially with the red laser light have demonstrated its pro-healing potential on a variety of pre-clinical and surgical wounds. However, until now, in LLLT the effect of multiple exposure of low dose laser irradiation on acute wound healing on well-designed pre-clinical model is not much explored. The present study aimed to investigate the effect of multiple exposure of low dose Helium Neon laser on healing progression of full thickness excision wounds in Swiss albino mice. Further, the efficacy of the multiple exposure of low dose laser irradiation was compared with the single exposure of optimum dose. Full thickness excision wounds (circular) of 15 mm diameter were created, and subsequently illuminated with the multiple exposures (1, 2, 3, 4 and 5 exposure/ week until healing) of He-Ne (632.8 nm, 4.02 mWcm-2) laser at 0.5 Jcm-2 along with single exposure of optimum laser dose (2 J/cm-2) and un-illuminated controls. Classical biophysical parameters such as contraction kinetics, area under the curve and the mean healing time were documented as the assessment parameters to examine the efficacy of multiple exposures with low level laser dose. Experimental findings substantiated that either single or multiple exposures of 0.5 J/cm2 failed to produce any detectable alterations on wound contraction, area under the curve and mean healing time compared to single exposure of optimum dose (2 Jcm-2) and un-illuminated controls. Single exposure of optimum, laser dose was found to be ideal for acute wound healing.

  9. Dielectric nanostructures with high laser damage threshold

    Science.gov (United States)

    Ngo, C. Y.; Hong, L. Y.; Deng, J.; Khoo, E. H.; Liu, Z.; Wu, R. F.; Teng, J. H.

    2017-02-01

    Dielectric-based metamaterials are proposed to be the ideal candidates for low-loss, high-efficiency devices. However, to employ dielectric nanostructures for high-power applications, the dielectric material must have a high laser-induced damaged threshold (LIDT) value. In this work, we investigated the LIDT values of dielectric nanostructures for high-power fiber laser applications. Consequently, we found that the fabricated SiO2 nanostructured lens can withstand laser fluence exceeding 100 J/cm2.

  10. Antimicrobial properties of arginine- and lysine-rich histones and involvement of bacterial outer membrane protease T in their differential mode of actions.

    Science.gov (United States)

    Tagai, Chihiro; Morita, Shuu; Shiraishi, Takayuki; Miyaji, Kazuyuki; Iwamuro, Shawichi

    2011-10-01

    There is growing evidence of the antimicrobial properties of histones and histone-derived peptides; however, most of them are specific to lysine (Lys)-rich histones (H1, H2A, and H2B). In the present study, we focused on arginine (Arg)-rich histones (H3 and H4) and investigated their antimicrobial properties in comparison with those of histone H2B. In a standard microdilution assay, calf thymus histones H2B, H3, and H4 showed growth inhibitory activity against the bacterial outer membrane protease T (OmpT) gene-expressing Escherichia coli strain JCM5491 with calculated 50% growth inhibitory concentrations of 3.8, 10, and 12.7 μM, respectively. A lysate prepared from the JCM5491 cells was capable of strongly, moderately, and slightly fragmenting histones H2B, H3, and H4, respectively. While the lysate prepared from the cells of the ompT-deleted E. coli strain BL21(DE3) did not digest these histones, the ompT-transformed BL21(DE3), termed BL21/OmpT(+), cell lysate digested the histones more strongly than the JCM5491 cell lysate. Laser confocal and scanning electron microscopic analyses demonstrated that while histone H2B penetrated the cell membrane of JCM5491 or BL21/OmpT(+) cells, histones H3 and H4 remained on the cell surface and subsequently disrupted the cell membrane structure with bleb formation in a manner similar to general antimicrobial peptides. The BL21(DE3) cells treated with each histone showed no bleb formation, but cell integrity was affected and the cell surface was corrugated. Consequently, it is suggested that OmpT is involved in the antimicrobial properties of Arg- and Lys-rich histones and that the modes of antimicrobial action of these histones are different. Copyright © 2011 Elsevier Inc. All rights reserved.

  11. The effect of selective photosuppression of sensitized pathogenic microflora: Part II. Experimental validation on animals

    Science.gov (United States)

    Masychev, Viktor I.; Risovannaya, Olga N.

    2005-03-01

    Results of in vivo experiments have shown the maximum effectiveness of combined use of photo sensitizer 0,1% gel Radachlorine simultaneously with continuous and super pulse low energy irradiation of the diode laser with energy density 400 J/cm2, and power 1W. Given parameters have lead to complete elimination of Streptococcus pyogenes from inflammation foci in oral cavity of experimental animals.

  12. Influence of Two Different Fluences on Laser Photobiomodulation of Wound Healing in Diabetic and Nondiabetic Mice

    Science.gov (United States)

    Peplow, Philip V.; Chung, Tzu-Yun; Baxter, G. David

    2011-08-01

    Background: Laser irradiation of wounds in mice and rats was shown in previous studies to stimulate healing but in almost all the studies the wounds were not covered. Purpose: To compare the healing of covered wounds in diabetic and nondiabetic mice and the effect of laser irradiation 660 nm at two different fluences (energy densities). Method: A single wound 5-mm diameter was made on the left flank of forty-seven diabetic and twenty nondiabetic mice and covered with Tegaderm HP dressing (day 1). Wounds were irradiated 660 nm 20 s using a low power (18 mW) or high power (80 mW) laser starting immediately post-wounding for 7 consecutive days, with non-irradiated wounds as controls. Mice were euthanized on day 8, 10 or 14. Wound specimens were cut and stained with haematoxylin and eosin, and examined by light microscopy. Results: Wound healing was impaired in diabetic mice. Tegaderm HP dressing had retarded contraction in a large proportion of diabetic mice (splinted the wounds) and to a lesser extent in nondiabetic mice. Healing of splinted wounds was delayed compared to unsplinted wounds, but laser irradiation at high power stimulated healing by re-epithelization and granulation tissue formation. The fluence of low power laser was estimated to be about 1 J/cm2, while that of the high power laser was 3.7 to 5.0 J/cm2. Conclusion: Laser irradiation of wounds 660 nm with 1 J/cm2 had little effect on healing of wounds in diabetic and nondiabetic mice, whereas irradiation with 3.7 to 5.0 J/cm2 stimulated healing of wounds in diabetic mice most of which were splinted by the dressing.

  13. Effect of wavelength and fluence on morphology, cellular and genetic integrity of diabetic wounded human skin fibroblasts

    Science.gov (United States)

    Abrahamse, H.; Hawkins, D.; Houreld, N.

    2006-02-01

    An alternative treatment modality for diabetic wound healing includes low level laser therapy (LLLT). Biostimulation of such wounds may be of benefit to patients by reducing healing time. Structural, cellular and genetic events in diabetic wounded human skin fibroblasts (WS1) were evaluated after exposing cells in culture to a Helium-Neon (632.8nm), a Diode laser (830nm) and a Nd:YAG (Neodynium:Yttrium-Allumina-Gallium) laser (1064nm) at either 5J/cm2 or 16J/cm2. Cells were exposed twice a week and left 24 hours post-irradiation prior to measuring effects. Structural changes were evaluated by assessing colony formation, haptotaxis and chemotaxis. Cellular changes were evaluated using cell viability, (adenosine-triphosphate, ATP production), and proliferation, (alkaline phosphatase, ALP and basic fibroblast growth factor, bFGF expression), while the Comet assay evaluated DNA damage and cytotoxicity was determined assessing membrane permeability for lactate dehydrogenase (LDH). Caspase 3/7 activity was used as an estimate of apoptosis as a result of irradiation. The irradiated diabetic wounded cells showed structural, cellular as well as molecular resilience comparable to that of unwounded normal skin fibroblast cells. With regards to fluence, 5J/cm2 elicit positive cellular and structural responses while 16J/cm2 increases cellular and genetic damage and cellular morphology is altered. Different wavelengths of LLLT influences the beneficial outcomes of diabetic wounded cells and although all three wavelengths elicit cellular effects, the penetration depth of 830nm plays a significant role in the healing of diabetic wounded human fibroblast cells. Results from this study validate the contribution of LLLT to wound healing and elucidate the biochemical effects at a cellular level while highlighting the role of different dosages and wavelengths in LLLT.

  14. Laser-induced breakdown spectroscopy analysis of human deciduous teeth samples.

    Science.gov (United States)

    Khalid, Arooj; Bashir, Shazia; Akram, Mahreen; Hayat, Asma

    2015-12-01

    Laser-induced breakdown spectroscopy (LIBS) analysis of human deciduous teeth has been performed by employing Nd:YAG laser (1064 nm, 10 ns) for the evaluation of plasma parameters as well as elemental analysis. The plasma parameters, i.e., electron temperature and electron number density of laser-induced teeth plasma at various fluencies, have been evaluated. Both parameters show an increasing trend up to a certain value of laser fluence, i.e., 2.6 J/cm(2). With further increase in laser fluence up to a value of 3.9 J/cm(2), a decreasing trend is observed which is due to shielding effect. With further increase in laser fluence up to a maximum value of 10.5 J/cm(2), the insignificant changes in plasma parameters are observed which are attributed to saturation phenomenon governed by self-regulating regime. Emission spectroscopy results exhibit that laser fluence is the controlling factor for both plasma parameters. The elemental analysis was also performed at constant laser fluence of 2.6 J/cm(2) by evaluating the variation in detected elemental concentration of Ca, Fe, Sr, Zn, and Pb in three different parts of human teeth, i.e., enamel, dentine, and cementum. The lower concentration of Ca as compared to the standard values of CaCO3 (self-fabricated pellet) reveals that enamel is the most deciduous part of the human teeth. However, at the same time, it is also observed that the highest concentration of micro minerals is also found in enamel, then in dentine, and lowest in cementum. Carious or unhealthy tooth is identified by enhanced concentration of micro minerals (Pb, Sr, Zn, and Fe). The highest concentration of micro minerals as compared to other parts of teeth (dentine and root cementum) and lower concentration of Ca as compared to standard CaCO3 pellet in enamel confirm that enamel is the most deciduous part of the teeth.

  15. Effects of laser therapy on chronic skin ulcers healing interventions for Sudanese patients

    Directory of Open Access Journals (Sweden)

    Abdelrazig M. Abdelbagi

    2015-12-01

    Results: Utilization of laser dosage (energy density of 40 J/cm2 and 1.6 w/cm2 power density of the wavelength 820 nm and 30 J/cm2 energy density and power density of 0.24 w/cm2 of 780 nm wavelength, in addition to energy density of 8 J/cm2 and power density of 0.24 w/cm2 and 0.40 w/cm2 and energy density of 1.6 J/cm2 for the 675 wavelength was applied. In this study, we used the bio-stimulation effect of LLLT to enhance healing through immune modulation. However, the application of low level diode laser in the treatment of diabetic wounds can be accompanied by low energy density and short wavelength to give better results in a short time and a good diagnostic accuracy for its potentiality in the field. Conclusions: Consequently, the brown skins in Sub-Saharan region for different tissues of Sudanese diabetic patients of chronic skin ulcer can be treated with different wavelengths and energy relative to tissues softening and laser parameters of that optimum values were obtained. The assessment of skin regeneration using laser therapy expose that the quality of growth, the reasonable period of healing and decreases the risk skin infection were achieved. The process of diabetic wounds curing and de-pigmentation, potential resident of decreasing pain and an efficient adjunct to a standard wound management was obtained. [Int J Res Med Sci 2015; 3(12.000: 3720-3725

  16. Effects of Carbide on Hardness and Impact Toughness of CADI%碳化物对CADI硬度和冲击韧度的影响

    Institute of Scientific and Technical Information of China (English)

    张其飞; 刘兰俊; 祖方遒; 刘建升; 周鹏

    2012-01-01

    对于含碳化物等温淬火球墨铸铁(CADI),加入以铬为主的碳化物形成元素,并采用奥氏体化工艺来控制组织中碳化物的量.结果显示,随着试样中的铬的加入量从0.553%增加到0.997%,基体中碳化物量增多,经920℃保温100 min奥氏体化、然后在280.℃进行等温淬火处理90 min,后其硬度从42.7 HRC提高到50.5 HRC,但冲击韧度从61.4 J/cm2下降到37.8 J/cm2.%With regard to carbide austempered ductile iron(C ADI), some carbide forming elements primarily chromium were added to, and took the austenitic process to control the amount of carbide in the matrix of CADI. With the amount of chromium in the samples increased, the amount of carbide increased in the matrix, the results showed that the as-cast samples were austenited at 920 ℃ for l00min and then austempered at 280℃ for 90 min, the hardness rose from 39.2 HRC to 47.5 HRC, but the impact toughness declined from 68.4 J/cm2 to 44.8 J/cm2.

  17. Vitamin D2 Formation from Post-Harvest UV-B Treatment of Mushrooms (Agaricus bisporus) and Retention during Storage

    Science.gov (United States)

    The objectives of this research were to study the effects of high intensity (0.5, 0.75, and 1.0 mW/cm2), dose (0.5, 1.0, and 1.5 J/cm2), and post-harvest time (1 and 4 days) on the vitamin D2 formation in Portabella mushrooms (Agaricus bisporus) as a result of UV-B exposure, as well as the vitamin D...

  18. Comparative study of excimer and erbium:YAG lasers for ablation of structural components of the knee

    Science.gov (United States)

    Vari, Sandor G.; Shi, Wei-Qiang; van der Veen, Maurits J.; Fishbein, Michael C.; Miller, J. M.; Papaioannou, Thanassis; Grundfest, Warren S.

    1991-05-01

    This study was designed to compare the efficiency and thermal effect of a 135 ns pulsed-stretched XeCl excimer laser (308 nm) and a free-running Erbium:YAG laser (2940 nm) with 200 microsecond(s) pulse duration for ablation of knee joint structures (hyaline and fibrous cartilage, tendon and bone). The radiant exposure used for tissue ablation ranged from 2 to 15 J/cm2 for the XeCl excimer and from 33 to 120 J/cm2 for Er:YAG. The excimer and Er:YAG lasers were operated at 4 and 5 Hz respectively. The ablative laser energy was delivered to tissue through fibers. Ablation rates of soft tissues (hyaline and fibrous cartilage, tendon) varied from 8.5 to 203 micrometers /pulse for excimer and from 8.2 to 273 micrometers /pulse for Er:YAG lasers. Ablation rates of soft tissues are linearly dependent on the radiant exposure. Within the range of parameters tested all the tissues except the bone could be rapidly ablated by both lasers. Bone ablation was much less efficient, requiring 15 J/cm2 and 110 J/cm2 radiant exposure for excimer and Er:YAG lasers to ablate 9.5 and 8.2 micrometers tissue per pulse. However, excimer laser ablation produced less thermal damage in the tissues studied compared to Er:YAG at the same laser parameters. The authors conclude that both lasers are capable of efficient knee joint tissue ablation. XeCl excimer laser requires an order of magnitude less energy than Er:YAG laser for comparable tissue ablation.

  19. The nature of glow arising in PETN monocrystals’ explosion initiated by a pulsed electron beam

    Science.gov (United States)

    Aduev, B. P.; Belokurov, G. M.; Grechin, S. S.; Liskov, I. Yu; Kalenskii, A. V.; Zvekov, A. A.

    2015-04-01

    The explosive decomposition of pentaerythritol tetranitrate monocrystals under the influence of a high-current electron beam (0.25 MeV, 20 ns, 15 J/cm2) was researched with the approach of high temporal resolution optic spectroscopy. We measured kinetics and emission spectra in real time scale. The thermal nature of the explosive glow was proven with the method of spectral pyrometry. The estimated temperature of the explosion is T ≈ 3000 K..

  20. Angular distributions and total yield of laser ablated silver

    DEFF Research Database (Denmark)

    Svendsen, Winnie Edith; Nordskov, A.; Schou, Jørgen;

    1997-01-01

    The angular distribution of laser ablated silver has been measured in situ with a newly constructed setup with an array of microbalances. The distribution is strongly peaked in the forward direction corresponding to cospθ, where p varies between 5 and 9 for laser fluences from 2 to 7 J/cm2 at 355...... nm for a beam spot of 0.015 cm2. The total deposited yield is of the order 1015 Ag-atoms per pulse....

  1. Bacteroides reticulotermitis sp. nov., isolated from the gut of a subterranean termite (Reticulitermes speratus).

    Science.gov (United States)

    Sakamoto, Mitsuo; Ohkuma, Moriya

    2013-02-01

    An obligately anaerobic, non-pigmented, non-spore-forming, Gram-staining-negative, rod-shaped bacterium, designated strain Rs-03(T), was isolated from the gut of the subterranean termite Reticulitermes speratus. The taxonomic position of the novel strain was determined by following a polyphasic approach. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain Rs-03(T) was a member of the genus Bacteroides and was most closely related to Bacteroides thetaiotaomicron JCM 5827(T) (95.0 % sequence similarity), Bacteroides faecis JCM 16478(T) (94.8 %) and Bacteroides xylanisolvens JCM 15633(T) (94.3 %). The results of hsp60 gene sequence analysis indicated that the novel strain was different from established members of the genus Bacteroides. Strain Rs-03(T) was saccharolytic and produced succinic and acetic acids, with small amounts of propionic acid, as metabolic end products. The major cellular fatty acids of strain Rs-03(T) were anteiso-C(15 : 0), C(18 : 1)ω9c and iso-C(17 : 0) 3-OH. The major menaquinones were MK-10 and MK-9 and the genomic DNA G+C content was 44.9 mol%. Based on these data, strain Rs-03(T) represents a novel species in the genus Bacteroides, for which the name Bacteroides reticulotermitis sp. nov. is proposed. The type strain is Rs-03(T) ( = JCM 10512(T) = CCUG 62153(T)).

  2. Cracks growth behaviors of commercial pure titanium under nanosecond laser irradiation for formation of nanostructure-covered microstructures (with sub-5-μm)

    Science.gov (United States)

    Pan, A. F.; Wang, W. J.; Mei, X. S.; Zheng, B. X.; Yan, Z. X.

    2016-11-01

    This study reported on the formation of sub-5-μm microstructures covered on titanium by cracks growth under 10-ns laser radiation at the wavelength of 532 nm and its induced light modification for production of nanostructures. The electric field intensity and laser power density absorbed by commercial pure titanium were computed to investigate the self-trapping introduced by cracks and the effect of surface morphology on laser propagation characteristics. It is found that nanostructures can form at the surface with the curvature radius below 20 μm. Meanwhile, variable laser fluences were applied to explore the evolution of cracks on commercial pure titanium with or without melt as spot overlap number increased. Experimental study was first performed at the peak laser fluence of 1.063 J/cm2 to investigate the microstructures induced only by cracks growth. The results demonstrated that angular microstructures with size between 1.68 μm and 4.74 μm was obtained and no nanostructure covered. Then, at the peak laser fluence of 2.126 J/cm2, there were some nanostructures covered on the melt-induced curved microstructured surface. However, surface molten material submerged in the most of cracks at the spot overlap number of 744, where the old cracks disappeared. The results indicated that there was too much molten material and melting time at the peak laser fluence of 2.126 J/cm2, which was not suitable for obtainment of perfect micro-nano structures. On this basis, peak laser fluence was reduced down to 1.595 J/cm2 and the sharp sub-5 μm microstructures with nanostructures covered was obtained at spot overlap number of 3720.

  3. Streptomyces songpinggouensis sp. nov., a Novel Actinomycete Isolated from Soil in Sichuan, China.

    Science.gov (United States)

    Guan, Xuejiao; Li, Wenchao; Liu, Chongxi; Jin, Pinjiao; Guo, Siyu; Wang, Xiangjing; Xiang, Wensheng

    2016-12-01

    During a screening for novel and biotechnologically useful actinobacteria, a novel actinobacteria with weak antifungal activity, designated strain NEAU-Spg19(T), was isolated from a soil sample collected from pine forest in Songpinggou, Sichuan, southwest China. The strain was characterized using a polyphasic taxonomic approach which confirmed that it belongs to the genus Streptomyces. Growth occurred at a temperature range of 10-30 °C, pH 5.0-11.0 and NaCl concentrations of 0-5 %. The cell wall peptidoglycan consisted of LL-diaminopimelic acid and glycine. The major menaquinones were MK-9(H6), MK-9(H8) and MK-9(H4). The phospholipid profile contained diphosphatidylglycerol (DPG), phosphatidylethanolamine and phosphatidylinositol. The major fatty acids were iso-C15:0, iso-C16:0, and C16:0. 16S rRNA gene sequence similarity studies showed that strain NEAU-Spg19(T) belongs to the genus Streptomyces with the highest sequence similarities to Streptomyces tauricus JCM 4837(T) (98.6 %) and Streptomyces rectiviolaceus JCM 9092(T) (98.3 %). Some physiological and biochemical properties and low DNA-DNA relatedness values enabled the strain to be differentiated from S. tauricus JCM 4837(T) and S. rectiviolaceus JCM 9092(T). Hence, on the basis of phenotypic and genetic analyses, it is proposed that strain NEAU-Spg19(T) represents a novel species of the genus Streptomyces, for which the name Streptomyces songpinggouensis sp. nov. is proposed. The type strain is NEAU-Spg19(T) (=CGMCC 4.7140(T)=DSM 42141(T)).

  4. Streptomyces formicae sp. nov., a novel actinomycete isolated from the head of Camponotus japonicus Mayr.

    Science.gov (United States)

    Bai, Lu; Liu, Chongxi; Guo, Lifeng; Piao, Chenyu; Li, Zhilei; Li, Jiansong; Jia, Feiyu; Wang, Xiangjing; Xiang, Wensheng

    2016-02-01

    During a screening for novel and biotechnologically useful actinobacteria in insects, a novel actinomycete with antifungal activity, designated strain 1H-GS9(T), was isolated from the head of a Camponotus japonicus Mayr ant, which were collected from Northeast Agricultural University (Harbin, Heilongjiang, China). Strain 1H-GS9(T) was characterised using a polyphasic approach. The organism was found to have morphological and chemotaxonomic characteristics typical of members of the genus Streptomyces. 16S rRNA gene sequence similarity studies showed that strain 1H-GS9(T) belongs to the genus Streptomyces with high sequence similarities to Streptomyces scopuliridis DSM 41917(T) (98.8 %) and Streptomyces mauvecolor JCM 5002(T) (98.6 %). However, phylogenetic analysis based on the 16S rRNA gene sequence indicated that it forms a monophyletic clade with Streptomyces kurssanovii JCM 4388(T) (98.6 %), Streptomyces xantholiticus JCM 4282(T) (98.6 %) and Streptomyces peucetius JCM 9920(T) (98.5 %). Thus, a combination of DNA-DNA hybridization experiments and phenotypic tests were carried out between strain 1H-GS9(T) and the above-mentioned five strains, which further clarified their relatedness and demonstrated that strain 1H-GS9(T) could be distinguished from these strains. Therefore, the strain is concluded to represent a novel species of the genus Streptomyces, for which the name Streptomyces formicae sp. nov. is proposed. The type strain is 1H-GS9(T) (=CGMCC 4.7277(T) = DSM 100524(T)).

  5. Study of the anode plasma dynamics under the action of a high-power electron beam on epoxy resin

    Science.gov (United States)

    Ananyev, S. S.; Bagdasarov, G. A.; Gasilov, V. A.; Dan'ko, S. A.; Demidov, B. A.; Kazakov, E. D.; Kalinin, Yu. G.; Kurilo, A. A.; Ol'khovskaya, O. G.; Strizhakov, M. G.; Tkachenko, S. I.

    2017-07-01

    Results are presented from experimental studies of plasma dynamics in a diode gap under the action of a high-current relativistic electron beam on epoxy resin at energy densities in the range of 170-860 J/cm2. The plasma expansion was studied by means of an optical streak camera. Three-dimensional numerical simulations in the one-temperature hydrodynamic approximation were also performed. The experimental data are compared with the results of numerical simulations.

  6. Pulsed UV laser light on Escherichia coli and Saccharomyces cerevisiae suspended in non-alcoholic beer

    Science.gov (United States)

    Hosseini, SM; Azar-Daryany, MK; Massudi, R; Elikaei, A

    2011-01-01

    Background The aim of this study was to investigate the effect of pulsed ultra-violet (UV) irradiation on inactivation of beer spoilage microorganisms. UV irradiation is nowadays cost effective enough to compete with traditional biological, physical, and chemical treatment technologies and has become an alternative to such methods. Material and Methods Photoinactivation effects of pulsed UV laser with the wavelengths of 355 and 266 nm, which inactivate typical prokaryotic (Escherichia coli) and eukaryotic (Saccharomyces cerevisiae) microorganisms, were examined with different doses and exposure times. Results A dose of 100 J/cm2 of the 355 nm pulsed UV laser was able to reduce about 1 to 2 log (88.75%) of E.coli with the population of 1.6×108 colony-forming units (CFU/ml), and 97% of 3.2×107, 3×106, 5.5×105, and 9×104 CFU/ml. In the case of 266 nm, more than 99% reduction in E. coli serial dilutions was inactivated, using 10 J/cm2 with exception of 7×104 CFU/ml which was not detected any bacterial growth using 5 J/cm2. In addition, 50, 40, and 20 J/cm2 energy were used successfully to inactivate S. cerevisiae at the populations of 5.4×106, 7×105, 5×104 and 4×103 CFU/ml, respectively. As a result, pulsed UV Laser with 266 nm was strong enough to inactivate a high titer of bacterial and yeast indicator standards suspended in non-alcoholic beer in comparison with 355nm doses. Conclusion Results indicate that pulsed UV technology, in principle, is an attractive alternative to conventional methods for the inactivation of indicator microorganisms and has potential in irradiation of unpasteurized beer. PMID:22347580

  7. Determinants of the Army Applicant Job Choice Decision and the Development of a Decision Support Tool for the Enlistment Incentive Review Board

    Science.gov (United States)

    2012-02-01

    gender, AFQT category, and education status. To obtain a parsimonious model , the MOS alternative-subgroup interactions were specified to be constant...Enlistment Incentive Review Board Tirso E. Diaz, and Paul J. Sticha Human Resources Research Organization Paul Hogan The Lewin Group...tools, estimated a Job Choice Model (JCM) based on actual applicant choice data from the Army’s Recruit Quota System (REQUEST) for the first and

  8. Lactobacillus insicii sp. nov., isolated from fermented raw meat.

    Science.gov (United States)

    Ehrmann, Matthias A; Kröckel, Lothar; Lick, Sonja; Radmann, Pia; Bantleon, Annegret; Vogel, Rudi F

    2016-01-01

    The analysis of the bacterial microbiota of retain samples of pork salami revealed an isolate (strain TMW 1.2011T) that could neither be assigned to typical genera of starter organisms nor to any other known meat-associated species. Cells were Gram-stain-positive, short, straight rods occurring singly, in pairs or short chains. Phylogenetic analysis of the 16S rRNA gene sequence and specific phenotypic characteristics showed that strain TMW 1.2011T belonged to the phylogenetic Lactobacillus alimentarius group, and the closest neighbours were Lactobacillus nodensis JCM 14932T (97.8 % 16S rRNA gene sequence similarity), Lactobacillus tucceti DSM 20183T (97.4 %), 'Lactobacillus ginsenosidimutans' EMML 3041 (97.3 %), Lactobacillus versmoldensis DSM 14857T (96.9 %) and Lactobacillus furfuricola JCM 18764T (97.2 %). Similarities using partial gene sequences of the alternative chronometers pheS, dnaK and rpoA also support these relationships. DNA-DNA relatedness between the novel isolate and L. nodensis JCM 14932T, L. versmoldensis DSM 14857T and L. tucceti DSM 20183T, L. furfuricola JCM 18764T and 'L. ginsenosidimutans' EMML 3041 were below 70 % and the DNA G+C content was 36.3 mol%. The cell-wall peptidoglycan type is l-Lys-Gly-d-Asp. Based on phylogenetic, chemotaxonomic and physiological evidence, strain TMW 1.2011T represents a novel species of the genus Lactobacillus, for which the name Lactobacillus insicii sp. nov. is proposed. The type strain is TMW 1.2011T ( = CECT 8802T = DSM 29801T).

  9. DNA damage in human skin fibroblasts exposed to UVA light used in clinical PUVA treatment

    Energy Technology Data Exchange (ETDEWEB)

    Bredberg, A.

    1981-06-01

    Human skin fibroblasts were irradiated with a clinically used UVA light source. The doses (1.1 and 3 J/cm2) were similar to those reaching the dermis during clinical PUVA treatment of psoriasis. DNA strand breaks, as determined by alkaline elution, were formed in a dose-dependent way and disappeared within 1 hr of postincubation at 37 degrees C. These findings have clinical implications since UVA-induced DNA damage may be accompanied by mutagenic and tumor promoting effects.

  10. Combination of CO2 and Q-switched Nd:YAG lasers is more effective than Q-switched Nd:YAG laser alone for eyebrow tattoo removal.

    Science.gov (United States)

    Radmanesh, Mohammad; Rafiei, Zohreh

    2015-04-01

    The eyebrow tattoo removal using Q-switched lasers is usually prolonged. Other modalities may be required to enhance the efficacy and shorten the treatment course. To compare the efficacy of Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) laser alone versus combination of Q-switched Nd:YAG and Ultrapulse CO2 lasers for eyebrow tattoo removal after a single session. After local anesthesia, the right eyebrow of 20 patients was treated with Ultrapulse CO2 laser with the parameters of 4 J/cm(2) and 3.2 J/cm(2) for the first and the second passes. Both eyebrows were then treated with 1064-nm and 532-nm Q-switched Nd:YAG laser. The spot size and pulse duration were 3 mm and 5 nanoseconds for both wavelengths, and the fluence was 7 J/cm(2) for 1064 nm and 3 J/cm (2) for 532 nm. The side treated with combination of Q-switched Nd:YAG and CO2 lasers improved 75-100% in 6 of 20 patients versus only 1 of 20 in the side treated with Q-switched Nd:YAG alone. Similarly, the right side in 13 of 20 patients showed more than 50% improvement with combination therapy versus the left side (the monotherapy side), where only 6 of 20 cases showed more than 50% improvement. The Mann-Whitney test was 2.85 for the right side and 1.95 for the left side (P value = 0.007). Using Ultra pulse CO2 laser enhances the efficacy of Q-switched Nd:YAG laser in eyebrow tattoo removal.

  11. A Phase I Study of Light Dose for Photodynamic Therapy (PDT) Using 2-[1-hexyloxyethyl]-2 devinyl Pyropheophorbide-a (HPPH) for Treatment of Non-small Cell Carcinoma in situ or Non-small Cell Microinvasive Bronchogenic Carcinoma. A Dose Ranging Study

    Science.gov (United States)

    Dhillon, Samjot Singh; Demmy, Todd L.; Yendamuri, Sai; Loewen, Gregory; Nwogu, Chukwumere; Cooper, Michele; Henderson, Barbara W.

    2015-01-01

    Introduction We report a phase I trial of photodynamic therapy (PDT) of carcinoma-insitu (CIS) and microinvasive cancer (MIC) of the central airways with the photosensitizer (PS) 2-[1-hexyloxyethyl]-2-devinyl pyropheophorbide-a (HPPH). HPPH has the advantage of minimal general phototoxicity over the commonly used PS porfimer sodium (Photofrin®). Methods The objectives of this study were 1) to determine the maximally tolerated light dose at a fixed PS dose and 2) to gain initial insight into the effectiveness of this treatment approach. Seventeen patients with 21 CIS/MIC lesions were treated with HPPH with light dose escalation starting from 75 J/cm2 to 85, 95,125, and 150 J/cm2 respectively. Follow-up bronchoscopy for response assessment was done at one and six months, respectively. Results The rate of pathological complete response (CR) was 82.4% (14/17 evaluable lesions; 14 patients) at one-month and 72.7% (8/11 lesions; 8 patients) at 6 months. Only 4 patients developed mild skin erythema. One of the three patients in 150 J/cm2 light dose group experienced a serious adverse event. This patient had respiratory distress due to mucus plugging, which precipitated cardiac ischemia. Two additional patients treated subsequently at this light dose had no adverse events. The third sixth patient in this dose group was not recruited and the study was terminated because of delays in HPPH supply. However, given the observed serious adverse event, it is recommended that the light dose not exceed 125J/cm2. Conclusions PDT with HPPH can be safely used for the treatment of CIS/MIC of the airways, with potential effectiveness comparable to that reported for porfimer sodium in earlier studies. PMID:26718878

  12. Complete Genome Sequence of Thermus thermophilus TMY, Isolated from a Geothermal Power Plant

    Science.gov (United States)

    Fujino, Yasuhiro; Nagayoshi, Yuko; Ohshima, Toshihisa; Ogata, Seiya

    2017-01-01

    ABSTRACT Thermus thermophilus TMY (JCM 10668) was isolated from silica scale formed at a geothermal power plant in Japan. Here, we report the complete genome sequence for this strain, which contains a chromosomal DNA of 2,121,526 bp with 2,500 predicted genes and a pTMY plasmid of 19,139 bp, with 28 predicted genes. PMID:28153912

  13. 氨基酮戊酸光动力疗法对鲜红斑痣动物模型鸡冠的影响%Effects of aminolevulinic acid-based photodynamic therapy on chicken combs, an animal model for port wine stains

    Institute of Scientific and Technical Information of China (English)

    王娇; 黄熙

    2015-01-01

    目的:探讨外用氨基酮戊酸光动力疗法(ALA-PDT)对鲜红斑痣(PWS)动物模型鸡冠的作用和治疗鲜红斑痣的可行性。方法80只莱亨鸡随机分为10组:空白对照组、单纯 ALA 组、单纯激光75 J/cm2组、100 J/cm2组、150 J/cm2、200 J/cm2组,ALA-PDT 75 J/cm2组、100 J/cm2组、150 J/cm2组、200 J/cm2组。单纯激光组仅给予630 nm 红光照射,ALA-PDT 组外用 ALA 后给予红光照射。干预14 d、28 d 分别取材,观察鸡冠形态学、组织学变化,计算毛细血管减少率和血管内皮细胞凋亡情况。结果外用 ALA-PDT 75 J/cm2、100 J/cm2、150 J/cm2和200 J/cm2组鸡冠实验区域颜色变淡,光镜下真皮毛细血管数目减少、管径变小,部分血管内皮细胞凋亡;毛细血管减少率分别为33.53%±4.89%、52.02%±2.77%、67.48%±5.58%、88.96%±2.47%;凋亡指数分别为:63.44±1.09、88.50±6.11、94.32±3.67、113.76±10.57,与其余各组分别比较,均 P <0.01;血管内皮细胞凋亡深度分别为:201.19μm ±0.33μm、266.15μm ±1.02μm、546.09μm ±2.45μm、766.37μm ±1.08μm,各组间两两比较,均 P <0.01。结论外用 ALA-PDT 对鸡冠毛细血管有明显损伤,损伤程度和深度与红光能量密度相关;诱导血管内皮细胞凋亡可能是其治疗机制之一。%Objective To investigate the effects of aminolevulinic acid-based photodynamic therapy(ALA-PDT) on chicken combs, an animal model for port wine stains (PWS), and to explore the feasibility of PWS treatment with ALA-PDT. Methods A total of 80 leghorns were randomly and equally divided into 10 groups: blank control group receiving no treatment, ALA group treated with ALA alone, four single laser groups irradiated with 630-nm red laser at 75, 100, 150 and 200 J/cm2 respectively, four ALA-PDT groups pretreated with ALA followed by 630-nm red laser radiation at 75, 100, 150 and 200 J/cm2 respectively. An area sized 1 cm × 1 cm were marked at one side

  14. Streptomyces palmae sp. nov., isolated from oil palm (Elaeis guineensis) rhizosphere soil.

    Science.gov (United States)

    Sujarit, Kanaporn; Kudo, Takuji; Ohkuma, Moriya; Pathom-Aree, Wasu; Lumyong, Saisamorn

    2016-10-01

    Actinomycete strain CMU-AB204T was isolated from oil palm rhizosphere soil collected in Chiang Mai University (Chiang Mai, Thailand). Based on morphological and chemotaxonomic characteristics, the organism was considered to belong to the genus Streptomyces. Whole cell-wall hydrolysates consisted of ll-diaminopimelic acid, glucose, ribose and galactose. The predominant menaquinones were MK-9(H4), MK-9(H6), MK-9(H2) and MK-8(H4). The fatty acid profile contained iso-C15 : 0, iso-C16 : 0 and anteiso-C15 : 0 as major components. The principal phospholipids detected were phosphatidylethanolamine, diphosphatidylglycerol and phosphatidylglycerol. The DNA G+C content of strain CMU-AB204T was 70.9 mol%. Based on 16S rRNA gene sequence similarity, strain CMU-AB204T was closely related to Streptomyces orinoci JCM 4546T (98.7 %), Streptomyces lilacinus NBRC 12884T (98.5 %), Streptomyces abikoensis CGMCC 4.1662T (98.5 %), Streptomyces griseocarneus JCM 4905T (98.4 %) and Streptomyces xinghaiensis JCM 16958T (98.3 %). Phylogenetic trees revealed that the new strain had a distinct taxonomic position from closely related type strains of the genus Streptomyces. Spiny to hairy spores clearly differentiated strain CMU-AB204T from the five most closely related Streptomyces species, which produced smooth spores. On the basis of evidence from this polyphasic study, it is proposed that strain CMU-AB204T represents a novel species of the genus Streptomyces, namely Streptomyces palmae sp. nov. The type strain is CMU-AB204T (=JCM 31289T=TBRC 1999T).

  15. Reconstruction of the Jaynes-Cummings field state of ionic motion in a harmonic trap

    Science.gov (United States)

    Lv, Dingshun; An, Shuoming; Um, Mark; Zhang, Junhua; Zhang, Jing-Ning; Kim, M. S.; Kim, Kihwan

    2017-04-01

    A quantum state is fully characterized by its density matrix or equivalently by its quasiprobabilities in phase space. A scheme to identify the quasiprobabilities of a quantum state is an important tool in the recent development of quantum technologies. One of the most fundamental interaction models in quantum optics is the so-called Jaynes-Cummings model (JCM), which has been massively studied theoretically and experimentally. However, the expected essential dynamics of the field states under the resonant JCM has not been observed experimentally due to the lack of a proper reconstruction scheme. In this paper, we further develop a highly efficient vacuum measurement scheme and study the JCM dynamics in a trapped ion system with the capability of the vacuum measurement to reconstruct its quasiprobability Q function, which is a preferred choice to study the core of the dynamics of a quantum state in phase space. During the JCM dynamics, the Gaussian peak of the initial coherent state bifurcates and rotates around the origin of phase space. They merge at the so-called revival time at the other side of phase space. The measured Q function agrees with the theoretical prediction. Moreover, we reconstruct the Wigner function by deconvoluting the Q function and observe the quantum interference in the Wigner function at half of the revival time, where the vibrational state becomes nearly disentangled from the internal energy states and forms a superposition of two composite states. The scheme can be applied to other physical setups including cavity or circuit-QED and optomechanical systems.

  16. Light-induced mutagenicity in Salmonella TA102 and genotoxicity/cytotoxicity in human T-cells by 3,3'-dichlorobenzidine: a chemical used in the manufacture of dyes and pigments and in tattoo inks.

    Science.gov (United States)

    Wang, Lei; Yan, Jian; Hardy, William; Mosley, Charity; Wang, Shuguang; Yu, Hongtao

    2005-02-28

    DCB, 3,3'-dichlorobenzidine, is used primarily as an intermediate in the manufacture of diarylide yellow or azo red pigments for printing ink, textile, paint, and plastics. It is also used in tattoo inks. In this article, we investigate light-induced toxicity of DCB in both bacteria and human Jurkat T-cells. DCB itself is not toxic or mutagenic to Salmonella typhimurium TA102, but is photomutagenic at concentrations as low as 2 microM and phototoxic at concentrations >100 microM when bacteria are exposed to DCB and light at the same time (1.2 J/cm2 of UVA and 2.1 J/cm2 of visible light). Furthermore, DCB is both photocytotoxic and photogenotoxic to human Jurkat T-cells. Under a light irradiation dose of 2.3 J/cm2 of UVA and 4.2 J/cm2 of visible light, it causes the Jurkat T-cells to become nonviable in a DCB dose-dependent manner and the nonviable cells reaches 60% at DCB concentrations higher than 50 microM. At the same time, DNA fragmentation is observed for cells exposed to both DCB and light, determined by single cell gel electrophoresis (alkaline comet assay). As much as 5% (average) DNA fragmentation was observed when exposed to 200 microM DCB and light irradiation. This suggests that DCB can penetrate the cell membrane and enter the cell. Upon light activation, DCB in the cells can cause various cellular damages, leading to nonviable Jurkat T-cells. It appears, the nonviable cells are not caused solely by fragmentation of cellular DNA, but by other damages such as to proteins and cell membranes, or DNA alkylation. Therefore, persons exposed to DCB through environmental contamination or through tattoo piercing using DCB-containing inks must not only concern about its toxicity without exposing to light, but also its phototoxicity.

  17. Implementation of an Empirical Joint Constitutive Model into Finite-Discrete Element Analysis of the Geomechanical Behaviour of Fractured Rocks

    Science.gov (United States)

    Lei, Qinghua; Latham, John-Paul; Xiang, Jiansheng

    2016-12-01

    An empirical joint constitutive model (JCM) that captures the rough wall interaction behaviour of individual fractures associated with roughness characteristics observed in laboratory experiments is combined with the solid mechanical model of the finite-discrete element method (FEMDEM). The combined JCM-FEMDEM formulation gives realistic fracture behaviour with respect to shear strength, normal closure, and shear dilatancy and includes the recognition of fracture length influence as seen in experiments. The validity of the numerical model is demonstrated by a comparison with the experimentally established empirical solutions. A 2D plane strain geomechanical simulation is conducted using an outcrop-based naturally fractured rock model with far-field stresses loaded in two consecutive phases, i.e. take-up of isotropic stresses and imposition of two deviatoric stress conditions. The modelled behaviour of natural fractures in response to various stress conditions illustrates a range of realistic behaviour including closure, opening, shearing, dilatancy, and new crack propagation. With the increase in stress ratio, significant deformation enhancement occurs in the vicinity of fracture tips, intersections, and bends, where large apertures can be generated. The JCM-FEMDEM model is also compared with conventional approaches that neglect the scale dependency of joint properties or the roughness-induced additional frictional resistance. The results of this paper have important implications for understanding the geomechanical behaviour of fractured rocks in various engineering activities.

  18. Calcium solubility of dental enamel following Er, Cr:YSGG laser irradiation

    Science.gov (United States)

    Apel, Christian; Graeber, Hans-Georg; Gutknecht, Norbert

    2000-03-01

    Ever since the laser was introduced in dental medicine, there has been a constant discussion about its use in caries prevention. Various studies have already illustrated the possible uses of CO2 and argon lasers in this field of dentistry. The aim of the present study was to examine the Er,Cr:YSGG laser with regard to potential in reducing the acid solubility of dental enamel. Thirty freshly extracted bovine incisor teeth were prepared for this purpose. The crowns of the teeth were covered with hard wax, leaving a standardized test area free. The test specimens were then divided into three groups. The test area was uniformly irradiated with 2.7 J/cm2 in the first test group and 6.5 J/cm2 in the second test group. The third test group was left untreated (control group). Demineralization of the teeth was performed over a period of 24 hours in acetate buffer solution (0.1 mol/l) with a pH value of 4.5 and a temperature of 37 degrees Celsius. The calcium content of the solution was subsequently determined by flame photometry. The results confirm a significantly lower calcium content in the test group exposed to radiation of 6.5 J/cm2 (p less than 0.025). Dental enamel seems to have increased acid resistance following irradiation with the Er,Cr:YSGG laser.

  19. Green LED light has anti-inflammatory effects on burns in rats.

    Science.gov (United States)

    Catão, Maria H C V; Costa, Roniery O; Nonaka, Cassiano F W; Junior, Ricardo L C Albuquerque; Costa, Ivna R R S

    2016-03-01

    The aim of this study was to evaluate the effects of green LED light on inflammatory cells in skin burns: a histological study in rats. In this study, 40 rats were randomly divided into 2 groups: G1 - Control (CTR) and G2 - Green Led (LED). Immediately after injury, green light (60J/cm(2), 10s, λ520 at 550nm) was applied in a timely manner in the four coinciding points of the wound angles and at each point, the amount of 60J/cm (2) with a time of 10s was delivered, totaling 240J/cm(2) per session with 24h intervals until the day before animal sacrifice at 3, 7, 14 and 21 days with a lethal dose of intraperitoneal anesthetic. In the histological analysis, animals treated with green LED, from 7 days, showed a significant decrease (pGreen LED light provides an anti-inflammatory effect on skin burns of rats. Copyright © 2015 Elsevier Ltd and ISBI. All rights reserved.

  20. The influence of KrF excimer laser irradiation on the surface of collagen and collagen/PVP films

    Directory of Open Access Journals (Sweden)

    M. Wisniewski

    2006-01-01

    Full Text Available The surface properties of collagen and collagen/poly(vinyl pyrrolidone (PVP films after KrF excimer laser irradiation (λ=248nm were investigated by means of the technique of scanning electron microscopy (SEM and optical microscopy (OM. The laser irradiation of the used specimens caused an expansion of materials above their surface with pronounced sings of its melting. The height of the ablated volume in a case of collagen film at a fluence of 1.1J/cm2 was approximately 5μm. A white damage appears on the treated surfaces at a threshold of 0.5J/cm2 with a single pulse and becomes more visible for a higher fluence. It is also noteworthy that along with increasing fluences (beginning from the fluence of 1.7J/cm2, the characteristic filaments at the spot edges are observed. The local heat and pressure generated by the laser radiation were able to induce bubble formation on the surface. Further bubble colliding and bursting produce a three-dimensional polymer “microfoam” structure with interconnected pores. These results can be of interest for some new applications.

  1. A possible mechanism for visible-light-induced skin rejuvenation

    Science.gov (United States)

    Longo, Leonardo; Lubart, Rachel; Friedman, Harry; Lavie, R.

    2004-09-01

    In recent years there has been intensive research in the field of non-ablative skin rejuvenation. This comes as a response to the desire for a simple method of treating rhytids caused by aging, UV exposure and acne scars. In numerous studies intense visible light pulsed systems (20-30J/cm2) are used. The mechanism of action was supposed to be a selective heat induced denaturalization of dermal collagen that leads to subsequent reactive synthesis. In this study we suggest a different mechanism for photorejuvenation based on light induced Reactive Oxygen Species (ROS) formation. We irradiated collagen in-vitro with a broad band of visible light, 400-800 nm, 12-22J/cm2, and used the spin trapping coupled with electron paramagnetic resonance (EPR) spectroscopy to detect ROS. In vivo, we used dose 30 J in average (35 for acnis scars, 25 for wrinkles and redness). Irradiated collagen results in hydroxyl and methyl radicals formation. We propose, as a new concept, that visible light at the intensity used for skin rejuvenation, 20-30J/cm2, produces high amounts of ROS which destroy old collagen fibers encouraging the formation of new ones. On the other hand at inner depths of the skin, where the light intensity is much weaker, low amounts of ROS are formed which are well known to stimulate fibroblast proliferation.

  2. Morphological changes produced by acid dissolution in Er:YAG laser irradiated dental enamel.

    Science.gov (United States)

    Manuela Díaz-Monroy, Jennifer; Contreras-Bulnes, Rosalía; Fernando Olea-Mejía, Oscar; Emma Rodríguez-Vilchis, Laura; Sanchez-Flores, Ignacio

    2014-06-01

    Several scientific reports have shown the effects of Er:YAG laser irradiation on enamel morphology. However, there is lack of information regarding the morphological alterations produced by the acid attack on the irradiated surfaces. The aim of this study was to evaluate the morphological changes produced by acid dissolution in Er:YAG laser irradiated dental enamel. Forty-eight enamel samples were divided into four groups (n = 12). GI (control); Groups II, III, and IV were irradiated with Er:YAG at 100 mJ (12.7 J/cm(2) ), 200 mJ (25.5 J/cm(2) ), and 300 mJ (38.2 J/cm(2) ), respectively, at 10 Hz without water irrigation. Enamel morphology was evaluated before-irradiation, after-irradiation, and after-acid dissolution, by scanning electron microscopy (SEM). Sample coating was avoided and SEM analysis was performed in a low-vacuum mode. To facilitate the location of the assessment area, a reference point was marked. Morphological changes produced by acid dissolution of irradiated enamel were observed, specifically on laser-induced undesired effects. These morphological changes were from mild to severe, depending on the presence of after-irradiation undesired effects.

  3. Abrupt suspension of probiotics administration may increase host pathogen susceptibility by inducing gut dysbiosis.

    Science.gov (United States)

    Liu, Zhi; Liu, Wenshu; Ran, Chao; Hu, Jun; Zhou, Zhigang

    2016-03-17

    In this study, we investigated the risk associated with suspension of probiotics administration in tilapia, an animal model that may mimic immune-compromised conditions in humans. Tilapias were fed for 14 days using a probiotics-supplemented diet, followed by a three-day suspension of probiotics treatment and a subsequent challenge by Aeromonas hydrophila. Unexpectedly, the suspension of a probiotic strain Lactobacillus plantarum JCM1149 significantly triggered susceptibility of the host to A. hydrophila. We further observed that suspension of JCM1149 resulted in host gut microbiota dysbiosis and the subsequent disorder in the intestinal metabolites (bile acids, amino acids, and glucose) and damage in the intestinal epithelium, giving rise to a condition similar to antibiotics-induced gut dysbiosis, which collectively impaired tilapia's gut health and resistance to pathogenic challenges. Additionally, we determined that JCM1149 adhered relatively poorly to tilapia intestinal mucosa and was rapidly released from the gastrointestinal tract (GIT) after suspension, with the rapid loss of probiotic strain probably being the direct cause of gut dysbiosis. Finally, three other probiotic Lactobacillus strains with low intestinal mucosa binding activity showed similar rapid loss phenotype following administration suspension, and induced higher host susceptibility to infection, indicating that the risk is a generic phenomenon in Lactobacillus.

  4. Density effect on critical current density and flux pinning properties of polycrystalline SmFeAsO1 - xFx superconductor

    Science.gov (United States)

    Ding, Y.; Sun, Y.; Zhuang, J. C.; Cui, L. J.; Shi, Z. X.; Sumption, M. D.; Majoros, M.; Susner, M. A.; Kovacs, C. J.; Li, G. Z.; Collings, E. W.; Ren, Z. A.

    2011-12-01

    A series of polycrystalline SmFeAs1 - xOx bulks was prepared to systematically investigate the influence of sample density on flux pinning properties. Different sample densities were achieved by controlling the pelletizing pressure. The superconducting volume fraction, the critical current densities Jcm and the flux pinning force densities Fp were estimated from the magnetization measurements. Experimental results show that: (1) the superconducting volume fraction increases with the increasing of sample density; (2) the Jcm values have a similar trend except for the sample with very high density due to different connectivity and pinning mechanisms, moreover, the Jcm(B) curve develops a peak effect at approximately the same field at which the high density sample shows a kink; (3) the Fp(B) curve of the high density sample shows a low-field peak and a high-field peak at several temperatures, which can be explained by improved intergranular current, while only one peak can be observed in Fp(B) of the low density samples. Based on the scaling behaviour of flux pinning force densities, the main intragranular pinning is normal point pinning.

  5. UVB对Jurkat细胞Gadd45a表达和DNA甲基化水平的影响%Effects of ultraviolet B (UVB) on the expression of Gadd45a gene and DNA methylation level in Jurkat cells

    Institute of Scientific and Technical Information of China (English)

    李亚萍; 赵明; 陆前进

    2010-01-01

    目的 探讨中波紫外线(UVB)对Jurkat细胞Gadd45a表达和DNA甲基化水平的影响.方法 分别以UVB 1.0 J/cm2和1.5 J/cm2照射Jurkat细胞后,于6、12、24、48 h收集细胞,采用实时定量RT-PCR法检测Gadd45a mRNA水平和甲基化敏感基因CD11a、CD70 mRNA水平,同时检测Jurkat细胞基因组DNA总体甲基化水平的变化.结果 ①和照射前Jurkat细胞比较,UVB 1.0 J/cm2照射后6、12、24、48 h Jurkat细胞Gadd45a mRNA水平升高,以照射后6、12 h差异有统计学意义(P<0.01,P<0.05).UVB 1.0 J/cm2照射后,甲基化敏感基因CD11a、CD70 mRNA水平也升高,以照射后12 h差异有统计学意义(P值均<0.05).②以UVB 1.5 J/cm2照射Jurkat细胞,和照射前Jurkat细胞比较,照射后6、12、24、48 h,Jurkat细胞Gadd45a、CD11a、CD70 mRNA水平均显著升高(P<0.05或P<0.01).③和照射前Jurkat细胞比较,Jurkat细胞经UVB 1.0 J/cm2照射后6、12、24、48 h总体甲基化水平降低,照射后6、12 h甲基化水平差异有统计学意义(P<0.05,P<0.01).Jurkat细胞经UVB 1.5 J/cm2照射后6、12、24、48 h的总体甲基化水平显著降低,差异均有统计学意义(P值分别<0.01、<0.01、<0.01、<0.05).④UVB照射后Jurkat细胞的Gadd45a mRNA和DNA总体甲基化水平呈显著负相关(r=-0.395,P<0.05).结论 UVB能诱导Jurkat细胞Gadd45a表达上凋,同时Jurkat细胞基因组DNA发生低甲基化.%Objective To explore the effects of UVB on the expression of Gadd45a gene and DNA methylation levels in Jurkat cells. Methods Jurkat cells were irradiated with UVB of 1.0 J/cm2 and 1.5 J/cm2 respectively, and collected at 6, 12, 24 and 48 hours after the irradiation. Real-time RT-PCR was used to detect the mRNA expression of Gadd45a gene and methylation-sensitive genes CD11a and CD70. Global methylation level was also measured by MethylAmp global DNA methylation quantification kit. Results After irradiation with UVB at 1.0 J/cm2, the mRNA level of Gadd45a increased but

  6. Treatment of spontaneously occurring veterinary tumors with photodynamic therapy

    Science.gov (United States)

    Panjehpour, Masoud; Legendre, Alfred; Sneed, Rick E.; Overholt, Bergein F.

    1992-06-01

    Chloroaluminum phthalocyanine tetrasulfonate was administered intravenously (1.0 mg/kg) to client owned cats and a dog with spontaneously occurring squamous cell carcinoma of head and neck. Light was delivered 48 hours post injection of the photosensitizer. An argon- pumped dye-laser was used to illuminate the lesions with 675 nm light delivered through a microlens fiber and/or a cylindrical diffuser. The light dose was 100 J/cm2 superficially or 300 J/cm interstitially. Eleven photodynamic therapy treatments in seven cats and one dog were performed. Two cats received a second treatment in approximately sixty days after the initial treatment. The superficial dose of light was increased to 200 J/cm2 for the second treatment. While the longest follow-up is twelve months, the responses are encouraging. The dog had a complete response. Among the cats, three showed complete response, three showed partial response and one showed no response. One cat expired two days post treatment. It is early to evaluate the response in two cats that received second treatments. Photodynamic therapy with chloroaluminum phthalocyanine tetrasulfonate was effective in treating squamous cell carcinoma in pet animals.

  7. Desulfovibrio oceani subsp. oceani sp. nov., subsp. nov and Desulfovibrio oceani subsp. galateae subsp. nov., novel sulfate-reducing bacteria isolated from the oxygen minimum zone off the coast of Peru

    DEFF Research Database (Denmark)

    Finster, Kai; Kjeldsen, Kasper Urup

    2010-01-01

    at 20°C at pH 7.0-8.0 and at 2.5-3.5% NaCl (w/v). The strains grew by utilizing hydrogen/acetate, C3-4 fatty acids, amino acids and glycerol as electron acceptors for sulfate reduction. Fumarate, lactate and pyruvate supported fermentative growth. Sulfate, sulfite, thiosulfate and taurin supported......%) for strain I.9.1T. The G+C contents of their genomic DNA were 45-46 mol%. Phylogenetic analysis of 16S rRNA and dsrAB gene sequences showed that both strains belong to the genus Desulfovibrio. Desulfovibrio acrylicus DSM 10141T and Desulfovibrio marinisediminis JCM 14577T represented their closest validly.......1T represent a novel species for which the name Desulfovibrio oceani sp. nov. is proposed with the two subspecies D. oceani subsp. oceani (type strain, I.8.1T = DSM 21390T = JCM 15970T) and D. oceani subsp. galateae (type strain, I.9.1T = DSM 21391T = JCM 15971T)....

  8. Differential sensitivity of osteoblasts and bacterial pathogens to 405-nm light highlighting potential for decontamination applications in orthopedic surgery

    Science.gov (United States)

    Ramakrishnan, Praveen; Maclean, Michelle; MacGregor, Scott J.; Anderson, John G.; Grant, M. Helen

    2014-10-01

    Healthcare associated infections pose a major threat to patients admitted to hospitals and infection rates following orthopedic arthroplasty surgery are as high as 4%. A 405-nm high-intensity narrow spectrum light has been proven to reduce environmental contamination in hospital isolation rooms, and there is potential to develop this technology for application in arthroplasty surgery. Cultured rat osteoblasts were exposed to varying light intensities and it was found that exposures of up to a dose of 36 J/cm2 had no significant effect on cell viability [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay], function (alkaline phosphatase activity), and proliferation rate (BrdU cell proliferation assay). High irradiance exposures (54 J/cm2) significantly affected the cell viability indicating that the effects of 405-nm light on osteoblasts are dose dependent. Additionally, exposure of a variety of clinically related bacteria to a dose of 36 J/cm2 resulted in up to 100% kill. These results demonstrating the differential sensitivity of osteoblasts and bacteria to 405-nm light are an essential step toward developing the technique for decontamination in orthopedic surgery.

  9. Laser treatment in modulation of TMJ inflammation

    Science.gov (United States)

    Ross, Gerry

    2011-03-01

    Aim: The aim of this study was to evaluate the effectiveness of the laser in the treatment of hyperemia (edema) as assessed by a TMJ Doppler on 22 consecutive joints showing TMJ Hyperemia. Materials and Methods: The hyperemia of the joint was first evaluated using a TMJ Doppler device (Great Lakes Orthodontic Products - Buffalo NY) and it was recorded as severe, moderate or mild. The DioBeam 830 low level laser (830nm, 150mw continuous wave laser with a 1 cm beam, manufactured by CMS Dental Copenhagen, Denmark); 16 J/cm2 (8 J/cm2 with mouth open and 8 J/cm2 with the mouth closed). The treatment time was 2 minutes per joint. The hyperemia was assessed immediately following the treatment. Results: 22 joints have been evaluated on 16 patients. 12 had severe hyperemia, 9 had moderate hyperemia and 1 had mild hyperemia. All 22 joints showed complete resolution of the hyperemia immediately after laser therapy. There were no negative clinical results associated with the treatments.Conclusion: Low Level Laser Therapy (LLLT) was an effective tool in the treatment of hyperemia of the TMJ.

  10. Cell death induced on cell cultures and nude mouse skin by non-thermal, nanosecond-pulsed generated plasma.

    Directory of Open Access Journals (Sweden)

    Arnaud Duval

    Full Text Available Non-thermal plasmas are gaseous mixtures of molecules, radicals, and excited species with a small proportion of ions and energetic electrons. Non-thermal plasmas can be generated with any high electro-magnetic field. We studied here the pathological effects, and in particular cell death, induced by nanosecond-pulsed high voltage generated plasmas homogeneously applied on cell cultures and nude mouse skin. In vitro, Jurkat cells and HMEC exhibited apoptosis and necrosis, in dose-dependent manner. In vivo, on nude mouse skin, cell death occurred for doses above 113 J/cm(2 for the epidermis, 281 J/cm(2 for the dermis, and 394 J/cm(2 for the hypodermis. Using electron microscopy, we characterized apoptosis for low doses and necrosis for high doses. We demonstrated that these effects were not related to thermal, photonic or pH variations, and were due to the production of free radicals. The ability of cold plasmas to generate apoptosis on cells in suspension and, without any sensitizer, on precise skin areas, opens new fields of application in dermatology for extracorporeal blood cell treatment and the eradication of superficial skin lesions.

  11. Influence of laser and LED irradiation on mast cells of cutaneous wounds of rats with iron deficiency anemia

    Science.gov (United States)

    Becher Rosa, Cristiane; Oliveira Sampaio, Susana C. P.; Monteiro, Juliana S. C.; Ferreira, Maria F. L.; Zanini, Fátima A. A.; Santos, Jean N.; Cangussú, Maria Cristina T.; Pinheiro, Antonio L. B.

    2011-03-01

    This work aimed to study histologically the effect of Laser or LED phototherapy on mast cells on cutaneous wounds of rats with iron deficiency. 18 rats were used and fed with special peleted iron-free diet. An excisional wound was created on the dorsum of each animal which were divided into: Group I - Control with anemia + no treatment; Group II - Anemia + Laser; Group III - Anemia + LED; Group IV - Healthy + no treatment; Group V - Healthy + Laser; Group VI - Healthy + LED. Irradiation was performed using a diode Laser (λ660nm, 40mW, CW, total dose of 10J/cm2, 4X2.5J/cm2) or a RED-LED ( λ700nm, 15mW, CW, total dose of 10J/cm2). Histological specimens were routinely processed, cut and stained with toluidine blue and mast cell counts performed. No significant statistic difference was found between groups as to the number of degranulated, non-degradulated or total mast cells. Greater mean values were found for degranulated mast cells in the Anemia + LED. LED irradiation on healthy specimens resulted in a smaller number of degranulated mast cells. Our results leads to conclude that there are no significant differences in the number of mast cells seven days after irradiation following Laser or LED phototherapy.

  12. All Biomass and UV Protective Composite Composed of Compatibilized Lignin and Poly (Lactic-acid)

    Science.gov (United States)

    Kim, Youngjun; Suhr, Jonghwan; Seo, Hee-Won; Sun, Hanna; Kim, Sanghoon; Park, In-Kyung; Kim, Soo-Hyun; Lee, Youngkwan; Kim, Kwang-Jin; Nam, Jae-Do

    2017-03-01

    Utilization of carbon-neutral biomass became increasingly important due to a desperate need for carbon reduction in the issue of global warming in light of replacing petroleum-based materials. We used lignin, which was an abundant, low cost, and non-food based biomass, for the development of all biomass-based films and composites through reactive compatibilization with poly (lactic-acid) (PLA). Using a facile and practical route, the hydrophilic hydroxyl groups of lignin were acetylated to impose the compatibility with PLA. The solubility parameter of the pristine lignin at 26.3 (J/cm3)0.5 was altered to 20.9 (J/cm3)0.5 by acetylation allowing the good compatibility with PLA at 20.2 (J/cm3)0.5. The improved compatibility of lignin and PLA provided substantially decreased lignin domain size in composites (12.7 μm), which subsequently gave transparent and UV-protection films (visual transmittance at 76% and UV protection factor over 40). The tensile strength and elongation of the developed composite films were increased by 22% and 76%, respectively, and the biobased carbon content was confirmed as 96 ± 3%. The developed PLA/lignin composites provided 100% all-biomass contents and balanced optical and mechanical properties that could broaden its eco-friendly applications in various industries.

  13. All Biomass and UV Protective Composite Composed of Compatibilized Lignin and Poly (Lactic-acid)

    Science.gov (United States)

    Kim, Youngjun; Suhr, Jonghwan; Seo, Hee-Won; Sun, Hanna; Kim, Sanghoon; Park, In-Kyung; Kim, Soo-Hyun; Lee, Youngkwan; Kim, Kwang-Jin; Nam, Jae-Do

    2017-01-01

    Utilization of carbon-neutral biomass became increasingly important due to a desperate need for carbon reduction in the issue of global warming in light of replacing petroleum-based materials. We used lignin, which was an abundant, low cost, and non-food based biomass, for the development of all biomass-based films and composites through reactive compatibilization with poly (lactic-acid) (PLA). Using a facile and practical route, the hydrophilic hydroxyl groups of lignin were acetylated to impose the compatibility with PLA. The solubility parameter of the pristine lignin at 26.3 (J/cm3)0.5 was altered to 20.9 (J/cm3)0.5 by acetylation allowing the good compatibility with PLA at 20.2 (J/cm3)0.5. The improved compatibility of lignin and PLA provided substantially decreased lignin domain size in composites (12.7 μm), which subsequently gave transparent and UV-protection films (visual transmittance at 76% and UV protection factor over 40). The tensile strength and elongation of the developed composite films were increased by 22% and 76%, respectively, and the biobased carbon content was confirmed as 96 ± 3%. The developed PLA/lignin composites provided 100% all-biomass contents and balanced optical and mechanical properties that could broaden its eco-friendly applications in various industries.

  14. Abrupt suspension of probiotics administration may increase host pathogen susceptibility by inducing gut dysbiosis

    Science.gov (United States)

    Liu, Zhi; Liu, Wenshu; Ran, Chao; Hu, Jun; Zhou, Zhigang

    2016-01-01

    In this study, we investigated the risk associated with suspension of probiotics administration in tilapia, an animal model that may mimic immune-compromised conditions in humans. Tilapias were fed for 14 days using a probiotics-supplemented diet, followed by a three-day suspension of probiotics treatment and a subsequent challenge by Aeromonas hydrophila. Unexpectedly, the suspension of a probiotic strain Lactobacillus plantarum JCM1149 significantly triggered susceptibility of the host to A. hydrophila. We further observed that suspension of JCM1149 resulted in host gut microbiota dysbiosis and the subsequent disorder in the intestinal metabolites (bile acids, amino acids, and glucose) and damage in the intestinal epithelium, giving rise to a condition similar to antibiotics-induced gut dysbiosis, which collectively impaired tilapia’s gut health and resistance to pathogenic challenges. Additionally, we determined that JCM1149 adhered relatively poorly to tilapia intestinal mucosa and was rapidly released from the gastrointestinal tract (GIT) after suspension, with the rapid loss of probiotic strain probably being the direct cause of gut dysbiosis. Finally, three other probiotic Lactobacillus strains with low intestinal mucosa binding activity showed similar rapid loss phenotype following administration suspension, and induced higher host susceptibility to infection, indicating that the risk is a generic phenomenon in Lactobacillus. PMID:26983596

  15. Low-level laser therapy with helium-neon laser improved viability of osteoporotic bone marrow-derived mesenchymal stem cells from ovariectomy-induced osteoporotic rats

    Science.gov (United States)

    Fallahnezhad, Somaye; Piryaei, Abbas; Tabeie, Faraj; Nazarian, Hamid; Darbandi, Hasan; Amini, Abdoldllah; Mostafavinia, Ataroalsadat; Ghorishi, Seyed Kamran; Jalalifirouzkouhi, Ali; Bayat, Mohammad

    2016-09-01

    The purpose of this study was to evaluate the influences of helium-neon (He-Ne) and infrared (IR) lasers on the viability and proliferation rate of healthy and ovariectomy-induced osteoporotic (OVX) bone marrow mesenchymal stem cells (BMMSCs) in vitro. MSCs harvested from the BM of healthy and OVX rats were culture expanded. He-Ne and IR lasers were applied three times at energy densities of 0.6, 1.2, and 2.4 J/cm2 for BMMSCs. BMMSCs viability and proliferation rate were evaluated by MTT assay on days 2, 4, 6, 14, and 21. The results showed that healthy BMMSCs responded optimally to 0.6 J/cm2 using an IR laser after three times of laser radiation. Moreover, it was found that OVX-BMMSCs responded optimally to 0.6 J/cm2 with He-Ne laser and one-time laser radiation. It is concluded that the low-level laser therapy (LLLT) effect depends on the physiological state of the BMMSCs, type of the laser, wavelength, and number of laser sessions. The biostimulation efficiency of LLLT also depends on the delivered energy density. LLLT can enhance the viability and proliferation rate of healthy and especially osteoporotic autologous BMMSCs, which could be very useful in regenerative medicine.

  16. Assessment of the effects of laser or LED photobiomodulation on hypothyroid rats of cutaneous wound healing: A morphometric study.

    Science.gov (United States)

    De Castro, Isabele Cardoso Vieira; Paraguassú, Gardênia Matos; dod Reis Júnior, João Alves; Xavier, Flávia Caló Aquino; Rodriguez, Tânia Tavares; Ramalho, Maria José Pedreira; Pinheiro, Antônio L. B.; Ramalho, Luciana Maria Pedreira

    2012-09-01

    Hypothyroid has been associated to a disruption of the body's metabolism, including the healing process. Laser and LED have been shown to be effective on improving healing in many situations, but their benefit in the improvement of healing on hypothyroidism remains unknown. The aim of this study was to assess, morphometrically, the influence of Laser (λ660nm, 24 J/cm2, 40mW, CW, spot output= 4mm2;) and LED (λ630nm ± 20, 24 J/cm2, 150mW, CW, spot output= 0.5 cm2) on the wound healing of rats with Hypothyroid. Under general anesthesia, a standard surgical wound (1cm2) was created on the dorsum of 72 male Wistar rats divided into 6 groups of 12 animals each: G1: Euthyroid; G2: Euthyroid + Laser; G3: Euthyroid + LED; G4: Hypothyroid; G5: Hypothyroid + Laser and G6: Hypothyroid + LED. Hypothyroidism was induced in rats with propylthiouracil (0.05g/100mL) administered orally for 4 weeks and maintained until the end of the experiment. Rats were irradiated after surgery each 48h then killed after 7 and 14 days. Statistical analysis was performed using ANOVA and Tukey's test. Hypothyroid rats with phototherapy laser or LED showed significant less wound contraction than euthyroid's rats at the 7th day (pphotobiomodulation using 24 J/cm2 per session improved cutaneous wound healing in hypothyroid rats.

  17. Corticotropin-releasing factor secretion from dendritic cells stimulated by commensal bacteria

    Institute of Scientific and Technical Information of China (English)

    Mariko Hojo; Toshifumi Ohkusa; Harumi Tomeoku; Shigeo Koido; Daisuke Asaoka; Akihito Nagahara; Sumio Watanabe

    2011-01-01

    AIM: To study the production and secretion of corticotropin-releasing factor (CRF) by dendritic cells and the influence of commensal bacteria.METHODS: JAWSⅡ cells (ATCC CRL-11904), a mouse dendritic cell line, were seeded into 24-well culture plates and grown for 3 d. Commensal bacterial strains of Clostridium clostrodiiforme (JCM1291), Bacteroides vulgatus (B. vulgatus) (JCM5856), Escherichia coli (JCM1649), or Fusobacterium varium (F. varium) (ATCC8501) were added to the cells except for the control well, and incubated for 2 h. After incubation, we performed enzyme-linked immunosorbent assay for the cultured medium and reverse transcription polymerase chain reaction for the dendritic cells, and compared these values with controls.RESULTS: The level of CRF secretion by control dendritic cells was 40.4 ± 6.2 pg/mL. The CRF levels for cells incubated with F. varium and B. vulgatus were significantly higher than that of the control (P < 0.0001). CRF mRNA was present in the control sample without bacteria, and CRF mRNA levels in all samples treated with bacteria were above that of the control sample.F. varium caused the greatest increase in CRF mRNA expression. CONCLUSION: Our results suggest that dendritic cells produce CRF, a process augmented by commensal bacteria.

  18. Photodynamic inactivation of Acanthamoeba polyphaga with curcuminoids: an in vitro study

    Science.gov (United States)

    Corrêa, Thaila Q.; Geralde, Mariana C.; Carvalho, Mariana T.; Bagnato, Vanderlei S.; Kurachi, Cristina; de Souza, Clovis W. O.

    2016-03-01

    Acanthamoeba polyphaga are free-living amoebae that can be considered potentially pathogenic organisms by cause serious human infections, including keratitis and granulomatous amoebic encephalitis that usually results in death. Photodynamic inactivation (PDI) has been used for the biological control of microorganisms and can be promise in the control of Acanthamoeba infections. This study evaluated the in vitro effectiveness of PDI in A. polyphaga using curcuminoids salt as photosensitizer (PS) besides observing morphological changes caused by this PS in this organism, in confocal microscopy. A. polyphaga trophozoites were grown at 37°C in PYG medium for 48 to 72 hours. After, the trophozoites were incubated with PS solution during one hour and the samples were irradiated using light-emitting diodes at 460 nm at light doses 30 and 50 J/cm2. The results revealed reduction of 27.7%, 61.4% and 82.5% at 30 J/cm2 and 75.2%, 85.0% and 95.9% at 50 J/cm2, respectively, at curcuminoid salt concentrations of 500, 1000 and 1500 μg/mL. Through fluorescence images, it was possible to visualize the curcuminoid salt's uptake by the trophozoites. The PS showed toxicity to amoebae, in the dark, but the irradiation in PDI contributed to amoebae death effect. These data suggest that PDI may be an application of therapeutic intervention against Acanthamoeba infections, since it was effective in the inactivation of these amoebae.

  19. Ablation of skin tissue by holmium:YAG laser

    Science.gov (United States)

    Chen, Wei R.; Holt, Andrew; Nordquist, Robert E.

    1994-08-01

    Surface epithelial damage by Ho:YAG laser and recovery were studied using histology and electron microscopy. Rabbit skin was irradiated with fluence varying from 55 J/cm2 to 680 J/cm2. Laser damage was determined by histological measurement of three major injury indicators: surface lesion width, depth of photocoagulation, and depth of thermal damage. When the fluence increased, the surface lesion widened and the photocoagulation zone extended deeper into the dermis. The thermally damaged zone (60 degree(s)C muscle and nerve tissues appeared to remain intact under most of our irradiance except at 500 J/cm2 and greater. Thermally injured tissues began recovery within a short period and eventually returned to normal; electron microscopic findings indicated that severe swelling occurred in the individual collagen fibrils, but they were not disrupted and usually recovered to appear normal. A layer of new epithelium started growing underneath the photocoagulated zone around day 3. After 7 days, most photocoagulated tissue was partially, in some cases completely, separated from the skin by the new epithelium. The damage and recovery parameters established should aid in the clinical use of Holmium laser in treating lesions, benign or malignant, in hollow tubular organs and on surface epithelia.

  20. Low-power laser irradiation inhibits amyloid beta-induced cell apoptosis

    Science.gov (United States)

    Zhang, Heng; Wu, Shengnan

    2011-03-01

    The deposition and accumulation of amyloid-β-peptide (Aβ) in the brain are considered a pathological hallmark of Alzheimer's disease(AD). Apoptosis is a contributing pathophysiological mechanism of AD. Low-power laser irradiation (LPLI), a non-damage physical therapy, which has been used clinically for decades of years, is shown to promote cell proliferation and prevent apoptosis. Recently, low-power laser irradiation (LPLI) has been applied to moderate AD. In this study, Rat pheochromocytoma (PC12) cells were treated with amyloid beta 25-35 (Aβ25-35) for induction of apoptosis before LPLI treatment. We measured cell viability with CCK-8 according to the manufacture's protocol, the cell viability assays show that low fluence of LPLI (2 J/cm2 ) could inhibit the cells apoptosis. Then using statistical analysis of proportion of apoptotic cells by flow cytometry based on Annexin V-FITC/PI, the assays also reveal that low fluence of LPLI (2 J/cm2 ) could inhibit the Aβ-induced cell apoptosis. Taken together, we demonstrated that low fluence of LPLI (2 J/cm2 ) could inhibit the Aβ-induced cell apoptosis, these results directly point to a therapeutic strategy for the treatment of AD through LPLI.

  1. Comparison of continuous versus pulsed photodynamic antimicrobial therapy for inhibition of fungal keratitis isolates in vitro (Conference Presentation)

    Science.gov (United States)

    Nolan, Nicholas; Durkee, Heather A.; Aguilar, Mariela C.; Arboleda, Alejandro; Relhan, Nidhi; Martinez, Anna; Rowaan, Cornelis; Gonzalez, Alex; Alawa, Karam A.; Amescua, Guillermo; Flynn, Harry W.; Miller, Darlene; Parel, Jean-Marie A.

    2017-02-01

    Fungal keratitis can lead to pain and impaired vision. Current treatment options include antifungal agents and therapeutic penetrating keratoplasty. An emerging option for the management of keratitis is photodynamic antimicrobial therapy (PDAT) which uses a photosensitizer rose bengal activated with green light. Utilizing a pulsed irradiation, rather than the standard continuous irradiation may have a similar antimicrobial effect with less total energy. This study is to compare pulsed and continuous rose bengal mediated PDAT for inhibition of six fungal isolates on agar plates: Fusarium solani, Fusarium keratoplasticum, Aspergillus fumigatus, Candida albicans, Paecilomyces variotti, and Pseudoallescheria boydii. Isolates were mixed with 0.1% rose bengal and exposed to three irradiation conditions: (1) 30-minute continuous (10.8J/cm2), (2) 15-minute continuous (5.4J/cm2), (3) 30-minute pulsed (5.4J/cm2). Plates were photographed at 72 hours and analyzed with custom software. At 72 hours, 30-minute continuous rose bengal mediated PDAT inhibited all six fungal species. Fungal inhibition was analogous between 30-minute continuous and 30-minute pulsed test groups, with the exception of A. fumigatus. The 15-minute continuous irradiation was less effective when compared to both 30-minute continuous and 30-minute pulsed groups. These in vitro results demonstrate the potential strength of pulsed rose bengal mediated PDAT as an adjunct treatment modality for fungal keratitis.

  2. Bifidobacterium moukalabense sp. nov., isolated from the faeces of wild west lowland gorilla (Gorilla gorilla gorilla).

    Science.gov (United States)

    Tsuchida, Sayaka; Takahashi, Shunsuke; Nguema, Pierre Philippe Mbehang; Fujita, Shiho; Kitahara, Maki; Yamagiwa, Juichi; Ngomanda, Alfred; Ohkuma, Moriya; Ushida, Kazunari

    2014-02-01

    Gram-staining-positive anaerobic rods were isolated from the faeces of a wild lowland gorilla (Gorilla gorilla gorilla) in Moukalaba-Doudou National Park, Gabon, and strain GG01(T) was taxonomically investigated. Based on phylogenetic analyses and specific phenotypic characteristics, the strain belonged to the genus Bifidobacterium. Phylogenetic analysis of its 16S rRNA gene sequence revealed that strain GG01(T) formed a single monophyletic cluster and had a distinct line of descent. Based on 16S rRNA gene sequence similarity, the type strains of Bifidobacterium catenulatum JCM 1194(T) (98.3%) and Bifidobacterium pseudocatenulatum (98.1%) JCM 1200(T) were the most closely related to this novel strain, although it was clear that they belonged to different species. hsp60 sequences also supported these relationships. The DNA G+C content of this novel strain was 60.1 mol%. Bifidobacterium moukalabense sp. nov. (type strain GG01(T) = JCM 18751(T) = DSM 27321(T)) is proposed.

  3. Effect of Single Pulse Nd:YAG Laser Irradiation on Monolayer KB Cell Cultures%脉冲Nd:YAG激光对单层KB细胞损伤效应的研究

    Institute of Scientific and Technical Information of China (English)

    陈虹霞; 杨在富; 张杰; 杨景庚; 单清; 高光煌; 钱焕文

    2005-01-01

    目的:观察脉冲Nd:YAG激光照射体外单层培养KB细胞后的形态改变及损伤后HSP70, c-Fos的表达情况,初步探讨较强脉冲激光对细胞的损伤效应及损伤修复机制.方法:建立单层培养细胞的脉冲Nd:YAG激光损伤模型,每个脉冲能量密度为160 J/cm2~186 J/cm2或220 J/cm2~257 J/cm2,分别于照后即刻、2 h和6 h,用台盼蓝染色、TUNEL检测分析该激光对KB细胞的损伤特点,免疫组化法检测HSP70, c-Fos的表达水平.结果:当照射剂量为220 J/cm2~257J/cm2时,照后即刻,光斑中央细胞形态严重破坏,直接坏死;周围细胞形态未发生明显改变.2 h后周围细胞TUNEL着色也增强,呈强阳性.照后6 h光斑中央及周围细胞着色均减弱.TUNEL着色区直径随时间先扩大后缩小.当照射剂量为160 J/cm2~186 J/cm2时,细胞内HSP70、c-Fos表达随时间先显著增强,而后减弱至正常.结论:脉冲Nd:YAG激光在所选剂量下,可以引起单层KB细胞的损伤,包括即刻坏死、延迟性死亡及可逆性损伤.HSP70、c-Fos的高表达说明它们在保护受损细胞、修复激光所致损伤中发挥重要作用.%Objective: To investigate the character of morphological change after Nd:YAG laser irradiation on KB cells, and determine if two protective proteins(HSP70, c-Fos) are involved in the cellular stress response and repair processes. Methods: Monolayer KB cell cultures on glass-slides were irradiated with Nd:YAG laser. The pulse energy density was controlled within the range of 160 J/cm2~186 J/cm2 or 220 J/cm2~257 J/cm2 in single pulse mode. The cultures were then analyzed by means of trypan blue staining and TUNEL examination. HSP70 and c-Fos were examined with immunocytochemical staining. Results:KB cells at the center of laser beam were damaged instantly, the results of trypan blue staining and TUNEL were strong positive, while cells near the boundary of laser beam had hardly morphological change and were stained weakly. At 2h

  4. Low power laser irradiation stimulates cell proliferation via proliferating cell nuclear antigen and Ki-67 expression during tissue repair

    Science.gov (United States)

    Prabhu, Vijendra; Rao, Bola Sadashiva Satish; Mahato, Krishna Kishore

    2015-03-01

    Low power laser irradiation (LPLI) is becoming an increasingly popular and fast growing therapeutic modality in dermatology to treat various ailments without any reported side effects. In the present study an attempt was made to investigate the proliferative potential of red laser light during tissue repair in Swiss albino mice. To this end, full thickness excisional wounds of diameter 15 mm created on mice were exposed to single dose of Helium-Neon laser (632.8 nm; 7 mW; 4.02 mWcm-2; Linear polarization) at 2 Jcm-2 and 10 Jcm-2 along with un-illuminated controls. The granulation tissues from all the respective experimental groups were harvested on day 10 post-wounding following euthanization. Subsequently, tissue regeneration potential of these laser doses under study were evaluated by monitoring proliferating cell nuclear antigen and Ki-67 following the laser treatment and comparing it with the un-illuminated controls. The percentages of Ki-67 or PCNA positive cells were determined by counting positive nuclei (Ki-67/PCNA) and total nuclei in five random fields per tissue sections. Animal wounds treated with single exposure of the 2 Jcm-2 indicated significant elevation in PCNA (Ptested experimental groups as evidenced by the microscopy results in the study. In summary, the findings of the present study have clearly demonstrated the regulation of cell proliferation by LPLI via PCNA and Ki-67 expression during tissue regeneration.

  5. 980 nm diode lasers in oral and facial practice: current state of the science and art.

    Science.gov (United States)

    Desiate, Apollonia; Cantore, Stefania; Tullo, Domenica; Profeta, Giovanni; Grassi, Felice Roberto; Ballini, Andrea

    2009-11-24

    To evaluate the safety and efficacy of a 980 nm diode laser for the treatment of benign facial pigmented and vascular lesions, and in oral surgery. 20 patients were treated with a 980 nm diode laser. Oral surgery: 5 patients (5 upper and lower frenulectomy). Fluence levels were 5-15 J/cm(2); pulse lengths were 20-60 ms; spot size was 1 mm. Vascular lesions: 10 patients (5 small angiomas, 5 telangiectases). Fluences were 6-10 J/cm(2); pulse lengths were 10-50 ms; spot size was 2 mm. In all cases the areas surrounding the lesions were cooled. Pigmented lesions: 5 patients (5 keratoses). All the lesions were evaluated by dermatoscopy before the treatment. Fluence levels were 7-15 J/cm(2); pulse lengths were 20-50 ms; spot size was 1 mm. All the patients were followed at 1, 4 and 8 weeks after the procedure. Healing in oral surgery was within 10 days. The melanoses healed completely within four weeks. All the vascular lesions healed after 15 days without any residual scarring. The end results for the use of the 980 nm diode laser in oral and facial surgery appears to be justified on the grounds of efficacy and safety of the device, and good degree of acceptance by the patients, without compromising their health and function.

  6. Bibliometric investigation on preventive medicine in North Korea: a coauthor and keyword network analysis.

    Science.gov (United States)

    Jung, Minsoo

    2013-01-01

    This study examined the 2 preventive medicine journals in North Korea by using coauthor and keyword network analysis on the basis of medical informatics and bibliometrics. Used were the Journal of Chosun Medicine (JCM) and the Journal of Preventive Medicine (JPM) (from the first volume of 1997 to the fourth volume of 2006) as data. Extracted were 1734 coauthors from 1104 articles and 1567 coauthors from 1172 articles, respectively. Huge single components were extracted in the coauthor analysis, which indicated a tendency toward structuralization. However, the 2 journals differed in that JPM showed a relative tendency toward specialization, whereas JCM showed one toward generalization. Seventeen and 33 keywords were extracted from each journal in the keyword analysis; JCM mainly concerned pathological research, whereas JPM mainly concerned virus and basic medicine studies that were based on infection and immunity. In contrast to South Korea, North Korea has developed Juche medicine, which came from self-reliance ideology and gratuitous medical service. According to the present study, their ideology was embodied by the discovery of bacteria, study on immune system, and emphasis on pathology, on the basis of experimental epidemiology. However, insufficient research has been conducted thus far on population health and its related determinants.

  7. Apoptosis induced by low-level laser in polymorphonuclear cells of acute joint inflammation: comparative analysis of two energy densities.

    Science.gov (United States)

    Dos Anjos, Lúcia Mara Januário; da Fonseca, Adenilson de Souza; Gameiro, Jacy; de Paoli, Flávia

    2017-07-01

    Anti-inflammatory property of low-level laser therapy (LLLT) has been widely described in literature, although action mechanisms are not always clarified. Thus, this study aimed to evaluate apoptosis mechanisms in the LLLT anti-inflammatory effects on the arthritis experimental model in vivo at two different energy densities (3 and 30 Jcm(-2)). Arthritis was induced in mice by zymosan solution, animals were distributed into five groups, and morphological analysis, immunocytochemistry and gene expressions for apoptotic proteins were performed. Data showed an anti-inflammatory effect, DNA fragmentation in polymorphonuclear (PMN) cells and alteration in gene expression of proteins related to apoptosis pathways after LLLT. p53 gene expression increased at both energy densities, Bcl2 gene expression increased at 3 Jcm(-2), and Bcl2 tissue expression decreased at 30 Jcm(-2). In addition, apoptosis was restricted to PMN cells. Results suggest that apoptosis in PMN cells comprise part of LLLT anti-inflammatory mechanisms by disbalance promotion between expression of pro-apoptotic (Bax and p53) and anti-apoptotic (Bcl-2) proteins, with pro-apoptotic gene expression selectively in PMN cells.

  8. How phototherapy affects angiogenesis

    Science.gov (United States)

    Dyson, Mary

    2007-02-01

    Angiogenesis is essential for normal growth, tissue repair and regeneration. Its stimulation accelerates repair and regeneration including wound healing where these processes are delayed. Its inhibition can reduce the rate of growth of solid tumors. Phototherapy can accelerate the resolution of acute inflammation with the result that the proliferative phase of tissue repair, when angiogenesis occurs, begins earlier than in sham-irradiated controls. Evidence that angiogenesis is enhanced in dermal repair, tendon repair and bone regeneration in rodents is presented. The cellular mechanisms that control angiogenesis involve the interaction of endothelial cells, macrophages, pericytes and other cells in response, for example, to changes in the availability of oxygen in the local environment. Pericytes and macrophages modulate endothelial cell proliferation; pericytes guide endothelial cell migration. The stimulation of endothelial cell proliferation in vitro following exposure to red (660 nm) and infrared (820 nm) radiation, 15 mW, at 2-8 J/cm2 is presented. 1J/cm2 was ineffective. 820 nm irradiation, 15 mW, at 8 J/cm2 was observed to inhibit pericyte proliferation in vitro. Indirect effects on endothelial cell and pericyte proliferation followed stimulation of soluble mediator production by macrophages following exposure to red and infrared radiation. The potential clinical significance of the results obtained is discussed and the necessity of clinical trials emphasized.

  9. [Intervention of nicotinamide on skin melanin genesis after UVA exposed].

    Science.gov (United States)

    Patam, Muhammad; Jin, Xi-peng; Zhang, Yu-bin; Pan, Jian-ying; Shen, Guang-zu

    2007-08-01

    To investigate the interference effect of nicotinamide on UVA-induced melanin genesis and melanin transport in human skin melanocyte. The optimum UVA dose expected to cause cell proliferation: 0.2 J/cm(2), nicotinamide was added immediately after the 0.2 J/cm(2) UVA exposure and the melanin content, cell cycles, cell apoptosis and mRNA express level were measured respectively. Melanin content in melanocytes was increased significantly after exposed to 0.2 J/cm(2) UVA. Melanin content in melanocytes was decreased after treatment with 10.0 mmol/ml nicotinamide following UVA exposure, but the cell cycles and the cell apoptosis rate were not significantly altered. mRNA express levels of TYR, TRP-1 were modulated by nicotinamide. Nicotinamide has more effect on decreasing melanin genesis after UVA exposure, nicotinamide also plays a role in modulating the mRNA express of TYR, TRP-1 gene. It is possible to consider nicotinamide as an efficient and safe sun screen to provide a certain level of protection for UVA exposed skin.

  10. Decontamination of sugar syrup by pulsed light.

    Science.gov (United States)

    Chaine, Aline; Levy, Caroline; Lacour, Bernard; Riedel, Christophe; Carlin, Frédéric

    2012-05-01

    The pulsed light produced by xenon flash lamps was applied to 65 to 67 °Brix sugar syrups artificially contaminated with suspensions of Saccharomyces cerevisiae and with spores of Bacillus subtilis, Geobacillus stearothermophilus, Alicyclobacillus acidoterrestris, and Aspergillus niger. The emitted pulsed light contained 18.5 % UV radiation. At least 3-log reductions of S. cerevisiae, B. subtilis, G. stearothermophilus, and A. acidoterrestris suspended in 3-mm-deep volumes of sugar syrup were obtained with a fluence of the incident pulsed light equal to or less than 1.8 J/cm(2), and the same results were obtained for B. subtilis and A. acidoterrestris suspended in 10-mm-deep volumes of sugar syrup. A. niger spores would require a more intense treatment; for instance, the maximal log reduction was close to 1 with a fluence of the incident pulsed light of 1.2 J/cm(2). A flowthrough reactor with a flow rate of 320 ml/min and a flow gap of 2.15 mm was designed for pulsed light treatment of sugar syrup. Using this device, a 3-log reduction of A. acidoterrestris spores was obtained with 3 to 4 pulses of incident pulsed light at 0.91 J/cm(2) per sugar syrup volume.

  11. Characterization of polymer thin films obtained by pulsed laser deposition

    Science.gov (United States)

    Palla-Papavlu, A.; Dinca, V.; Ion, V.; Moldovan, A.; Mitu, B.; Luculescu, C.; Dinescu, M.

    2011-04-01

    The development of laser techniques for the deposition of polymer and biomaterial thin films on solid surfaces in a controlled manner has attracted great attention during the last few years. Here we report the deposition of thin polymer films, namely Polyepichlorhydrin by pulsed laser deposition. Polyepichlorhydrin polymer was deposited on flat substrate (i.e. silicon) using an NdYAG laser (266 nm, 5 ns pulse duration and 10 Hz repetition rate). The obtained thin films have been characterized by atomic force microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy and spectroscopic ellipsometry. It was found that for laser fluences up to 1.5 J/cm 2 the chemical structure of the deposited polyepichlorhydrin polymer thin layers resembles to the native polymer, whilst by increasing the laser fluence above 1.5 J/cm 2 the polyepichlorohydrin films present deviations from the bulk polymer. Morphological investigations (atomic force microscopy and scanning electron microscopy) reveal continuous polyepichlorhydrin thin films for a relatively narrow range of fluences (1-1.5 J/cm 2). The wavelength dependence of the refractive index and extinction coefficient was determined by ellipsometry studies which lead to new insights about the material. The obtained results indicate that pulsed laser deposition method is potentially useful for the fabrication of polymer thin films to be used in applications including electronics, microsensor or bioengineering industries.

  12. hsp60 and 16S rRNA gene sequence relationships among species of the genus Bacteroides with the finding that Bacteroides suis and Bacteroides tectus are heterotypic synonyms of Bacteroides pyogenes.

    Science.gov (United States)

    Sakamoto, Mitsuo; Suzuki, Natsuko; Benno, Yoshimi

    2010-12-01

    hsp60 gene sequences were determined for members of the genus Bacteroides and sequence similarities were compared with those obtained for the 16S rRNA gene. Among the 29 Bacteroides type strains, the mean sequence similarity of the hsp60 gene (84.5 %) was significantly less than that of the 16S rRNA gene (90.7 %), indicating a high discriminatory power of the hsp60 gene. Species of the genus Bacteroides were differentiated well by hsp60 gene sequence analysis, except for Bacteroides pyogenes JCM 6294(T), Bacteroides suis JCM 6292(T) and Bacteroides tectus JCM 10003(T). The hsp60 gene sequence analysis and the levels of DNA-DNA relatedness observed demonstrated that these three type strains are a single species. Consequently, B. suis and B. tectus are heterotypic synonyms of B. pyogenes. This study suggests that the hsp60 gene is an alternative phylogenetic marker for the classification of species of the genus Bacteroides.

  13. Inactivation of avirulent Yersinia pestis in Butterfield's phosphate buffer and frankfurters by UVC (254 nm) and gamma radiation.

    Science.gov (United States)

    Sommers, Christopher H; Cooke, Peter H

    2009-04-01

    Yersinia pestis is the causative agent of plague. Although rare, pharyngeal plague in humans has been associated with consumption or handling of meat prepared from infected animals. The risks of contracting plague from consumption of deliberately contaminated food are currently unknown. Gamma radiation is a penetrating form of electromagnetic radiation, and UVC radiation is used for decontamination of liquids or food surfaces. Gamma radiation D10-values (the radiation dose needed to inactivate 1 log unit pathogen) were 0.23 (+/-0.01) and 0.31 (+/-0.03) kGy for avirulent Y. pestis inoculated into Butterfield's phosphate buffer and onto frankfurter surfaces, respectively, at 0 degree C. A UVC radiation dose of 0.25 J/cm2 inactivated avirulent Y. pestis suspended in Butterfield's phosphate buffer. UVC radiation doses of 0.5 to 4.0 J/cm2 inactivated 0.97 to 1.20 log units of the Y. pestis surface inoculated onto frankfurters. A low gamma radiation dose of 1.6 kGy could provide a 5-log reduction and a UVC radiation dose of 1 to 4 J/cm2 would provide a 1-log reduction of Y. pestis surface inoculated onto frankfurters. Y. pestis was capable of growth on frankfurters during refrigerated storage (10 degrees C). Gamma radiation of frankfurters inhibited the growth of Y. pestis during refrigerated storage, and UVC radiation delayed the growth of Y. pestis.

  14. Dosimetric study of photobiomodulation therapy in 5-FU-induced oral mucositis in hamsters

    Science.gov (United States)

    Cotomacio, Claudia Carrara; Campos, Luana; Nesadal de Souza, Douglas; Arana-Chavez, Victor Elias; Simões, Alyne

    2017-01-01

    Oral mucositis (OM) is a debilitating consequence of cancer treatment that could be treated with photobiomodulation therapy (PBMT); however, there is no consensus about its dosimetric parameters for OM healing. The aim of this study was to compare different PBMT protocols on OM treatment, through clinical and histological analysis. Thirty hamsters were used, in an induced model of OM by 5-fluorouracil (5-FU) and superficial scratching, in seven days of follow-up. The animals were divided into five groups: control (C), which received only anesthesia and chemotherapeutic vehicle; chemotherapy (Ch), which received anesthesia, 5-FU, and scratches; laser 1 (L1), the same as Ch group, PBMT 6 J/cm2 and 0.24 J (one point); laser 2 (L2), the same as Ch group, PBMT 25 J/cm2 and 1 J (one point); and laser 3 (L3), the same as Ch group, PBMT 4 points of 0.24 J and 6 J/cm2 each. The laser used has λ=660 nm, 0.04 cm2 of spot area, and 40 mW. The best PBMT protocol to maintain lowest OM levels compared to Ch group was L1, followed by L2 and L3. Our results suggest that the application mode of PBMT and the energy delivered per area could interfere with the OM healing.

  15. Efficient utilization of ectoine by halophilic Brevibacterium species and Escherichia coli subjected to osmotic downshock.

    Science.gov (United States)

    Nagata, Shinichi; Wang, Chenxiang

    2005-01-01

    Halophilic and non-halophilic bacteria subjected to osmotic downshock, from 0.7 M NaCl to deionized water, were examined for their survival, with the uptake and utilization of the cyclic amino acid ectoine, one of the representative compatible solutes, being taken into account. The uptake of ectoine added externally and survival of the cells were monitored as a function of incubation time in the presence and absence of NaCl. The halophilic Brevibacterium sp. JCM 6894 and B. epidermidis JCM 2593 actively accumulated ectoine regardless of the presence of NaCl, which led to cell survival. Brevibacterium casei JCM 2594 belonging to the same Brevibacterium species, however, revealed Na+-dependence of its uptake activity of ectoine. Non-halophilic Escherichia coli K-12 did not accumulate ectoine, and thereby this strain failed to survive irrespective of whether NaCl was present. The physiological meanings of the downshock procedure are discussed in connection with the uptake and the subsequent utilization of ectoine.

  16. Conditions for random and periodic hole formations during surface ablation of silicon with ultrashort pulsed lasers

    Science.gov (United States)

    Domke, Matthias

    2015-03-01

    The formation of randomly distributed or periodic holes with a depth of several μm can be observed during the ablation of silicon with ultrafast lasers. In order to investigate the conditions for these hole formations, Si wafers with a thickness of 525 μm were ablated using a 380-fs laser at a wavelength of 520 nm. The surface was scanned parallel and perpendicular to the polarization of the laser beam with different fluences and numbers of scans. The ablated surfaces were analyzed by scanning electron microscopy. Their roughness was measured using confocal microscopy. At a fluences of 1.4 J/cm2, laser-induced periodic surface structures (LIPSS) orientate parallel to the polarization and periodic holes appear in the furrows independently of the polarization. At 4.3 J/cm2, LIPPS can be suppressed and the hole formation is reduced, if the polarization is perpendicular to the scan direction. The surface roughness reduces by a factor of 2. At 14.1 J/cm2, the formation of LIPPS is suppressed independently of the polarization, but the surface roughness increases again due to the increasing amount and size of melt ejections. The analysis of the surface suggests that random stacking of melt ejections creates bumps and holes. The depth of the holes increases with the number of scans. In this way, first random and then—with increasing number of scans—periodic holes appear. This effect can be enhanced by creating LIPPS.

  17. In vitro effect of low-level laser on odontoblast-like cells

    Science.gov (United States)

    Oliveira, C. F.; Basso, F. G.; Lins, E. C.; Kurachi, C.; Hebling, J.; Bagnato, V. S.; de Souza Costa, C. A.

    2011-02-01

    The aim of this study was to evaluate the metabolism of odontoblast-like MDPC-23 cells subjected to direct LLL irradiation. The cells were seeded (20,000 cells/well) in 24-well plates and incubated for 24 hours at 37°C. After this period, the culture medium (DMEM) was replaced by fresh DMEM supplemented with 2 or 5% (stress induction by nutritional deficit) or 10% fetal bovine serum (FBS). The cells were exposed to laser doses of 2, 4, 10, 15 and 25 J/cm2 from a near infrared InGaAsP diode laser prototype (LASERTable; 780±3 nm, 40 mW). One control group (sham irradiation) was established for each experimental condition (laser dose x FBS supplementation). Three and 72 hours after the last irradiation, cells were analyzed with respect to metabolism, morphology, total protein expression and alkaline phosphatase (ALP) activity. Higher metabolism and total protein expression were observed 72 hours after the last irradiation at the doses of 15 and 25 J/cm2 (Mann-Whitney; p stimulated the metabolic activity of the MDPC-23 cells, especially at the doses of 15 and 25 J/cm2.

  18. Adhesion of composite luting cement to Er:YAG-laser-treated dentin.

    Science.gov (United States)

    Carrieri, Teresa C D; de Freitas, Patricia M; Navarro, Ricardo S; Eduardo, Carlos de P; Mori, Matsuyoshi

    2007-09-01

    Although some studies claim to the increase of composite resin adhesion to Er:YAG-laser-treated dentin, there are still no reports on the adhesion of composite resin cements to the irradiated surface. This in vitro study evaluated the tensile bond strength (TBS) of a composite resin cement to dentin treated with the Er:YAG laser. Sixty human dentin samples were divided into four groups (n = 15): G1 (Control)-no treatment; G2-Er:YAG laser 60 mJ, 2 Hz, with water cooling, non-contact (19 J/cm(2)); G3-Er:YAG laser 60 mJ, 10 Hz, 50/10 fiber, contact, without water cooling (40 J/cm(2)); G4-Er:YAG laser 60 mJ, 10 Hz, 50/10 fiber, contact, with water cooling (40 J/cm(2)). After the surface treatment, each sample was submitted to bonding procedures. The analysis of variance (ANOVA) and Tukey tests revealed no statistical significant difference on TBS values for groups G1 (13.73 +/- 3.05 MPa), G2 (12.60 +/- 2.09 MPa) and G4 (11.17 +/- 4.04 MPa). G4 was not statistically different from G3 (8.64 +/- 2.06 MPa). Er:YAG laser irradiation with different settings can constitute an alternative tool to the use of composite resin-luting cements.

  19. Hydrocode Simulation with Modified Johnson-Cook Model and Experimental Analysis of Explosively Formed Projectiles

    Science.gov (United States)

    Hussain, G.; Hameed, A.; Hetherington, J. G.; Barton, P. C.; Malik, A. Q.

    2013-04-01

    The formation of mild steel (MS) and copper (Cu) explosively formed projectiles (EFPs) was simulated in AUTODYN using both the Johnson-Cook (JC) and modified Johnson-Cook (JCM) constitutive models. The JC model was modified by increasing the hardening constant by 10%. The previously established semi-empirical equations for diameter, length, velocity, and depth of penetration were used to verify the design of the EFP. The length-to-diameter (L/D) ratio of the warhead used in the simulation varied between 1 projectile distortion or breakup for large standoff applications, the design of the EFP warhead was modified to obtain a lower L/D ratio. Simulations from the JC model underestimated the EFP diameter, resulting in an unrealistically elongated projectile. This shortcoming was resolved by employing the JCM model, giving good agreement with the experimental results. The projectile velocity and hole characteristics in 10-mm-thick aluminum target plates were studied for both models. The semi-empirical equations and the JC model overestimated the projectile velocity, whereas the JCM model underestimated the velocity slightly when compared to the experimental results. The depths of penetration calculated by the semi-empirical equations in the aluminum (Al) target plate were 55 and 52 mm for Cu and MS EFPs, respectively.

  20. A development and biological safety evaluation of novel PVC medical devices with surface structures modified by UV irradiation to suppress plasticizer migration.

    Science.gov (United States)

    Haishima, Yuji; Isama, Kazuo; Hasegawa, Chie; Yuba, Toshiyasu; Matsuoka, Atsuko

    2013-09-01

    This study examines the chemical, physicochemical, and biological properties of PVC sheets treated with UV irradiation on their surfaces to suppress the elution of a plasticizer, di-(2-ethylhexyl) phthalate (DEHP), for developing novel polyvinyl chloride (PVC) medical devices. The PVC sheets irradiated under conditions 1 (52.5 μW/cm(2), 136 J/cm(2)) and 2 (0.45 mW/cm(2), 972 J/cm(2)) exhibited considerable toxicity in cytotoxicity tests and chromosome aberration tests due to the generation of DEHP oxidants, but no toxicity was detected in the PVC sheet irradiated under condition 3 (8.3 mW/cm(2), 134 J/cm(2)). The release of DEHP from the surface irradiated under condition 3 was significantly suppressed, and mono-(2-ethylhexyl) phthalate (MEHP) converted from a portion of DEHP could be easily removed from the surface by washing with methanol. The physicochemical properties of the surface regarding the suppression of DEHP elution remained stable through all sterilizations tested, but MEHP elution was partially recrudesced by the sterilizations except for gamma irradiation. These results indicated that UV irradiation using a strong UV-source over a short time (condition 3) followed by methanol washing and gamma sterilization may be useful for preparing novel PVC products that did not elute plasticizers and do not exhibit toxicity originating from UV irradiation.

  1. Chromosome mutations and tissue regeneration in the cornea after the UV laser irradiation

    Science.gov (United States)

    Razhev, Alexander M.; Bagayev, Sergei N.; Lebedeva, Lidya I.; Akhmametyeva, Elena M.; Zhupikov, Andrey A.

    2003-06-01

    In present paper the findings on chromosome mutations, the nature of damage and the repair of the cornea tissue after UV irradiation by excimer lasers at 193, 223 and 248 nm were made. Structural mutations induced by short-pulses UV irradiation were shown to be similar to spontaneous ones by the type, time of formation in the mitotic cycle and location of acentrics. Ten hours after irradiation of the cornea with doses of 0,09 to 1,5 J/cm2 the incidence of cells with chromosome aberrations increased linearly with dose and amounted to 11,7% at 248 nm, 5,5% at 223 nm and 2,6% at 193 nm per 1 J/cm2. No induced chromosome aberrations occurred 72 hour following irradiation. Within the dose range from 3,0 to 18 J/cm2 the cytogenesis effect of radiation was less manifest than that with the doses mentioned above, the frequency of chromosome aberrations being independent of either radiation wavelength or radiation dose and amounted of 2,5 to 3,0%. Thus, large doses of powerful short-pulse UV radiation are safe according to the structural mutation criterion.

  2. Critical current densities estimated from AC susceptibilities in proximity-induced superconducting matrix of multifilamentary wire

    Science.gov (United States)

    Akune, Tadahiro; Sakamoto, Nobuyoshi

    2009-03-01

    In a multifilamentary wire proximity-currents between filaments show a close resemblance with the inter-grain current in a high-Tc superconductor. The critical current densities of the proximity-induced superconducting matrix Jcm can be estimated from measured twist-pitch dependence of magnetization and have been shown to follow the well-known scaling law of the pinning strength. The grained Bean model is applied on the multifilamentary wire to obtain Jcm, where the filaments are immersed in the proximity-induced superconducting matrix. Difference of the superconducting characteristics of the filament, the matrix and the filament content factor give a variety of deformation on the AC susceptibility curves. The computed AC susceptibility curves of multifilamentary wires using the grained Bean model are favorably compared with the experimental results. The values of Jcm estimated from the susceptibilities using the grained Bean model are comparable to those estimated from measured twist-pitch dependence of magnetization. The applicability of the grained Bean model on the multifilamentary wire is discussed in detail.

  3. Influence of laser parameters in generating the NiTi nanoparticles with a rotating target using underwater solid state Nd: YAG laser ablation

    Science.gov (United States)

    Gagrani, Rohit; Patra, Nandini; Rajagopalan, P.; Singh, Vipul; Palani, I. A.

    2016-09-01

    The great effort that the scientific community has put in the last decade in the study of nanoscience and nanotechnology has been leading the research toward the development of new methodologies of nanostructures synthesis. Among them, Pulsed Laser Ablation in Liquid, PLAL, is gaining an increasing interest thanks to several promising advantages, which include: environmental sustainability, easy experimental set-up (which does not require extreme conditions of the ambient of synthesis), long-lasting stability of the nanoparticles, which are produced completely free of undesired contaminants or dangerous synthesis reactants. In this work, a drop wise flow of deionized water on the periphery of NiTi rotating target was tested as a procedure for the significant production of NiTi nanoparticles. This is a novel technique to improve the ablation efficiency of nanoparticles than the existing techniques of laser ablation. The influence of varying external parameters like laser wavelengths and laser fluences on the size distribution of nanoparticle was investigated. Second harmonic and third harmonics of Nd: YAG nanosecond laser with three different laser fluences of 30 J/cm2, 40 J/cm2 and 50 J/cm2 was used to ablate the nitinol (Ni-55%, Ti-45%) target. The average particle size and redistribution was characterized by dynamic light scattering (DLS) and the crystalline formation of NiTi nanoparticles were analyzed by X-ray diffraction, where it confirms the alloy formation of NiTi nanoparticles.

  4. Preliminary study of transurethral photodynamic therapy mediated with Tookad in a canine prostate model

    Science.gov (United States)

    Huang, Zheng; Hetzel, Fred W.; Chen, Qun; Dole, Kenneth C.

    2008-02-01

    Background: photodynamic therapy (PDT) mediated with vascular acting photosensitizer Tookad (pd-bacteriopheophorbide) was investigated as an alternative modality for treating prostate cancer. Our previous studies show that Tookad PDT can induce marked prostatic tissue lesion but minimal urethral lesion. In this study a transurethral procedure was used to evaluate the response of the prostatic urethra to direct urethral irradiation. Materials and Methods: Tookad solution (2.5 mg/ml) was administered (1 mg/kg) through IV catheter by an infusion pump over 10 min. A diffuser fiber (1 cm active length) was inserted into the prostatic urethra. The light irradiation (50 or 100 J/cm) started at 4 min after the onset of drug infusion. Urinalysis was performed for 24 - 48 h post PDT. One week after PDT, prostates (n = 4) were removed at necropsy and subjected to histopathological examination. Results: The cross section of prostates showed severe hemorrhagic and necrotic lesions on the right lobe. The diameter of the lesion, measured from urethra to capsule, was >13 mm for 50 J/cm treatment and >18 mm for 100 J/cm, respectively. Although underlying periurethral lesion was visible, the urethral surface was intact and prostatic urethra was open. Conclusions: The joint point of the diffuser tip and the guide fiber might be bent while passing through the sharp turn at the Ischial Arch, which could affect the light distribution and cause the asymmetric lesion. Nonetheless, the transurethral direct irradiation can induce marked prostatic tissue lesion but minimal urethral lesion.

  5. Low-power laser irradiation promotes the proliferation and osteogenic differentiation of human periodontal ligament cells via cyclic adenosine monophosphate

    Institute of Scientific and Technical Information of China (English)

    Jyun-Yi Wu; Chia-Hsin Chen; Li-Yin Yeh; Ming-Long Yeh; Chun-Chan Ting; Yan-Hsiung Wang

    2013-01-01

    Retaining or improving periodontal ligament (PDL) function is crucial for restoring periodontal defects. The aim of this study was to evaluate the physiological effects of low-power laser irradiation (LPLI) on the proliferation and osteogenic differentiation of human PDL (hPDL) cells. Cultured hPDL cells were irradiated (660 nm) daily with doses of 0, 1, 2 or 4 J?cm22. Cell proliferation was evaluated by the 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay, and the effect of LPLI on osteogenic differentiation was assessed by Alizarin Red S staining and alkaline phosphatase (ALP) activity. Additionally, osteogenic marker gene expression was confirmed by real-time reverse transcription-polymerase chain reaction (RT-PCR). Our data showed that LPLI at a dose of 2 J?cm22 significantly promoted hPDL cell proliferation at days 3 and 5. In addition, LPLI at energy doses of 2 and 4 J?cm22 showed potential osteogenic capacity, as it stimulated ALP activity, calcium deposition, and osteogenic gene expression. We also showed that cyclic adenosine monophosphate (cAMP) is a critical regulator of the LPLI-mediated effects on hPDL cells. This study shows that LPLI can promote the proliferation and osteogenic differentiation of hPDL cells. These results suggest the potential use of LPLI in clinical applications for periodontal tissue regeneration.

  6. Usefulness of a wavelength tunable optical parametric oscillator laser on photodynamic therapy

    Science.gov (United States)

    Nishiwaki, Yoshiro; Yoshida, Takato O.; Nakamura, Satoshi; Baba, Shozo; Matsusawa, Eiji; Suzuki, Hideo; Hirano, Toru

    1995-03-01

    By rotating the optical axis of a nonlinear optical crystal ((beta) -BaB2O4), a tunable laser beam could be obtained from an optical parametric oscillator (OPO) laser. When the crystal was optically pumped by the third harmonics of the 1064 nm Nd:YAG laser, we had a coherent beam from 410 nm through 2550 nm continuously without changing the optical cavity. We compared photodynamic therapy (PDT) effects of two photosensitizers, phenophorbide a(Phd) and Photosan-3(Ph-3, hematoporphyrin-polyester), on Wistar rat liver. Twenty-four hours after sensitization (5 mg/kg i.v.), 670 nm and 630 nm light (75 mW/cm2) was irradiated for Phd and Ph-3 respectively at energy doses of 25, 50, and 100 J/cm2. The rats were sacrificed 24 hours after laser irradiation and analyzed pathologically. Phd produced more severe necrosis than Ph-3. Twenty-five J/cm2 of Phd was identical with 100 J/cm2 of Ph-3. Next, we treated HeLa cell tumors of nude mice by Phd 670 nm PDT and Ph-3 630 nm PDT. The PDT effects of the two photosensitizers on HeLa cell tumors were similar to those on normal liver tissue. In conclusion the OPO laser could make it possible to compare PDT effects of photosensitizers by activating them with their matched wavelengths.

  7. Enterococcus faecium WB2000 Inhibits Biofilm Formation by Oral Cariogenic Streptococci

    Directory of Open Access Journals (Sweden)

    Nao Suzuki

    2011-01-01

    Full Text Available This study investigated the inhibitory effect of probiotic Enterococcus faecium WB2000 on biofilm formation by cariogenic streptococci. The ability of E. faecium WB2000 and JCM5804 and Enterococcus faecalis JCM5803 to inhibit biofilm formation by seven laboratory oral streptococcal strains and 13 clinical mutans streptococcal strains was assayed. The Enterococcal strains inhibited biofilm formation in dual cultures with the mutans streptococcal strains Streptococcus mutans Xc and Streptococcus sobrinus JCM5176 (P<0.05, but not with the noncariogenic streptococcal strains. Enterococcus faecium WB2000 inhibited biofilm formation by 90.0% (9/10 of the clinical S. mutans strains and 100% (3/3 of the clinical S. sobrinus strains. After culturing, the pH did not differ between single and dual cultures. The viable counts of floating mutans streptococci were lower in dual cultures with E. faecium WB2000 than in single cultures. Enterococcus faecium WB2000 acted as a probiotic bacterial inhibitor of cariogenic streptococcal biofilm formation.

  8. Laser-initiated channels for ion transport: CO2-laser absorption and heating of NH3 and C2H4 gases

    Science.gov (United States)

    Olsen, J. N.

    1981-05-01

    Initiation and guiding of an electrical discharge by CO2-laser heating of a molecular gas can provide a channel suitable for the transport of a light ion beam for inertial-confinement fusion. We report absorption measurements for a CO2 laser tuned to the molecular vibrations of NH3 and C2H4 as a function of gas pressure, laser frequency, and laser energy density. The SATUR laser-gas-interaction code models the details of the absorption saturation process for NH3, calculating gas temperature in the process. The calculation is normalized to absorption data at 0.04 J/cm2 and tested with transmission measurements up to 15 J/cm2 into a 50-cm cell. These calculations are the basis for understanding the electrical breakdown and discharge evolution as observed and simulated in the following report. Of particular importance is the calculation of gas temperature of 1900-2100 °K for 15-35-J/cm2 incident laser energy density.

  9. 长波紫外线对人皮肤成纤维细胞自噬水平的影响%Effects of ultraviolet A on autophagy in human skin fibroblasts

    Institute of Scientific and Technical Information of China (English)

    郑云鹏; 陈旭; 黄丹; 徐松; 顾恒

    2015-01-01

    Objective To evaluate the effects of ultraviolet A (UVA) on autophagy in human skin fibroblasts (HSFs).Methods Cultured HSFs were randomly divided into chronic and acute UVA radiation groups.HSFs in the chronic UVA radiation groups were irradiated with UVA at 5,10 and 20 J/cm2 separately once a day for 4 consecutive days,with HSFs receiving no radiation serving as the chronic radiation control group;HSFs in the acute UVA radiation groups received a single session of radiation with 5,10,30 and 60 J/cm2 UVA separately,with HSFs receiving no radiation serving as the acute radiation control group.After additional culture for different durations,methyl thiazolyl tetrazolium (MTT) assay was performed to evaluate the proliferative activity of HSFs,monodansylcadaverin (MDC) staining to determine autophagy levels,and Western blot analysis to track the conversion of the microtubule-associated protein 1 light chain-3 (LC3)-Ⅰ to LC3-Ⅱ.Statistical analysis was carried out by using one-way analysis of variance followed by Students-Newman-Keuls (SNK) test for multiple-group comparisons and by the independent sample t test for two-group comparisons.Results The cellular proliferative activity significantly decreased in the 3 chronic radiation groups at 1 hour after the final UVA radiation compared with the chronic radiation control group (F =155.5,P < 0.05),and in the 4 acute radiation groups at 1,6 and 12 hours after UVA radiation compared with the acute radiation control group (F =1 335,1 649,2 774,all P < 0.05).MDC staining showed that the autophagy levels in HSFs significantly increased in the 3 chronic radiation groups after UVA radiation compared with the chronic radiation control group (F =748.62,P > 0.05),but showed no significant changes in any of the acute radiation groups at 1,6 or 12 hours after UVA radiation compared with the acute radiation control group (F =0.014,0.004,0.002,all P > 0.05).The ratio of LC3-Ⅱ to LC3-Ⅰ was significantly elevated in all

  10. Effects of low-level laser therapy on stem cells from human exfoliated deciduous teeth

    Science.gov (United States)

    FERNANDES, Ana Paula; JUNQUEIRA, Marina de Azevedo; MARQUES, Nádia Carolina Teixeira; MACHADO, Maria Aparecida Andrade Moreira; SANTOS, Carlos Ferreira; OLIVEIRA, Thais Marchini; SAKAI, Vivien Thiemy

    2016-01-01

    ABSTRACT Low-Level Laser Therapy stimulates the proliferation of a variety of types of cells. However, very little is known about its effect on stem cells from human exfoliated deciduous teeth (SHED). Objective This study aimed to evaluate the influence of different laser therapy energy densities on SHED viability and proliferation. Material and Methods SHED were irradiated according to the groups: I (1.2 J/cm2 - 0.5 mW – 10 s), II (2.5 J/cm2 – 10 mW – 10 s), III (3.7 J/cm2 – 15 mW – 10 s), IV (5.0 J/cm2 – 20 mW – 10 s), V (6.2 J/cm2 – 25 mW – 10 s), and VI (not irradiated – control group). Cell viability was assessed 6 and 24 h after irradiation measuring the mitochondrial activity and using the Crystal Violet assay. Cell proliferation was assessed after 24, 48, and 72 h of irradiation by SRB assay. Results MTT assay demonstrated differences from 6 to 24 hours after irradiation. After 24 h, groups I and IV showed higher absorbance values than those of control group. Crystal Violet assay showed statistically differences in the absorbance rate from 6 to 24 h after irradiation for groups III and VI. At 24 h after irradiation, Group III absorbance rate was greater than that of groups I, II, and IV. Group VI absorbance rate was greater than that of groups I and IV. SRB assay showed that the group I had higher rates than those of groups II, III, V, and VI, at 24 h after irradiation. After 48 h, group I exhibited the greatest cell proliferation rate followed by groups III, V, and VI. After 72 h, group III exhibited the lowest cell proliferation rate than those of groups II, IV, and V. Conclusions The Low-Level Laser Therapy energy densities used in this study did not cause loss of cell viability and stimulated SHED proliferation within the parameters described in this study. PMID:27556203

  11. Polarized light (400-2000 nm) and non-ablative laser (685 nm): a description of the wound healing process using immunohistochemical analysis.

    Science.gov (United States)

    Pinheiro, Antonio Luiz B; Pozza, Daniel Humberto; Oliveira, Marilia G de; Weissmann, Ruben; Ramalho, Luciana Maria Pedreira

    2005-10-01

    This study aimed to describe, through morphologic and cytochemical analysis, the healing process of wounds submitted (or not) to laser therapy (lambda685 nm) or polarized light (lambda400-2000 nm). There are many reports on different effects of several types of phototherapies on the treatment of distinct conditions, amongst them, on wound healing. Laser therapy and the use of polarized light are still controversial despite successive reports on their positive effects on several biological processes. Thirty male Wistar rats, approximately 4 months old, were used, and standardized excisional wounds were created on their dorsum. The wounds were irradiated in four equidistant points with laser light or illuminated with polarized light, both with doses of 20 or 40 J/cm2. Group 1 acted as untreated controls. Animals were irradiated every 48 h during 7 days, starting immediately after surgery, and were humanely killed on the 8th post-operative day. Specimens were taken and routinely processed and stained with H&E, and for descriptive analysis of myofibroblasts and collagen fibers, the specimens were imunnomarked by smooth muscle alpha-actin and picrosirius stain. Control specimens showed the presence of ulceration, hyperemia, discrete edema, intense, and diffuse inflammation, collagen deposition was irregular, and myofibroblasts were seen parallel to the wound margins. Wounds treated by laser therapy with a dose of 20 J/cm2 showed mild hyperemia, inflammation varied from moderate to intense, the number of fibroblasts was large, and the distribution of collagen fibers was more regular. Increasing the dose to 40 J/cm2 evidenced exuberant neovascularization, severe hyperemia, moderate to severe inflammation, large collagen deposition, and fewer myofibroblasts. On subjects illuminated with polarized light with a dose of 20 J/cm2, mild to moderate hyperemia was detectable, and collagen matrix was expressive and unevenly distributed; a larger number of myofibroblasts was

  12. 强脉冲光对成纤维细胞分泌TGF-β1的影响及JNK抑制剂的干预作用%Influence of intense pulsed light on the secretion of TGF-β1 in cultured human fibroblasts and intervention of JNK inhibitor

    Institute of Scientific and Technical Information of China (English)

    鲁建云; 于小峰; 康健; 欧阳泽辉; 耿雪瑞; 向亚平; 黄进华

    2010-01-01

    目的:研究强脉冲光(intense pulsed light,IPL)照射对皮肤成纤维细胞分泌TGF-β1的影响及JNK抑制剂SP600125的干预作用.方法:利用包皮环切术切除的包皮组织体外分离、培养原代成纤维细胞.然后,将成纤维细胞分为两组试验:第1组为IPL治疗组,用能量密度分别为0(阴性对照),10,18,27,36和36 J/cm2×2(能量密度为36 J/cm2的IPL照射两次)的IPL照射;第2组为IPL+抑制剂组,包括IPL(对照)和IPL+SP600125(JNK抑制剂)两亚组,在加入抑制剂2 h后,用能量密度为36 J/cm2的IPL照射.48 h后,采用ELISA法检测两组细胞培养上清液(culture supernatants, CS)中TGF-β1的浓度.结果:IPL治疗组CS中TGF-β1的浓度在10,18,27及36 J/cm2分别与阴性对照组相比较均减少,而在36 J/cm2×2时与阴性对照相比较增高;IPL+抑制剂组CS中TGF-β1的浓度IPL+SP600125组与对照相比较减少(P<0.05).结论:强脉冲光在较低能量密度时抑制皮肤成纤维细胞TGF-β1的分泌,较高能量密度时能促进TGF-β1的分泌;在IPL影响成纤维细胞分泌TGF-β1的过程中,JNK抑制剂起抑制作用,IPL可能通过JNK途径上调TGF-β1的分泌.

  13. 5-氨基乙酰丙酸介导的光动力学作用对胃癌细胞MKN-45增殖与凋亡作用的研究%Effect of 5-aminolevulinic acid mediated photodynamic therapy on proliferation and apoptosis of gastric cancer cell line MKN-45

    Institute of Scientific and Technical Information of China (English)

    王晓龙; 魏军; 程立文; 张骞; 闫鹏; 王贵玉

    2016-01-01

    Objective To explore the 5-aminolevulinic acid (5-ALA) mediated photodynamic therapy (PDT) for proliferation and apoptosis of gastric cancer cell line MKN-45.Methods The human gastric cancer cell line MKN-45 was cultured in vitro.The MTT method was used to detect fixed lighting processing (laser radiation dose fixed for 25.00 J/cm2,5-ALA photosensitizer concentrations were 0 mmol/L,0.25 mmol/L,0.50 mmol/L,1.00 mmol/L,2.00 mmol/L),fixed photosensitizer concentration treatment (5-ALA photosensitizer concentrations fixed to 1.00 mmol/L,laser radiation dose were 0 J/cm2,6.25 J/cm2,12.50 J/cm2,25.00 J/cm2,50.00 J/cm2,100.00 J/cm2) of the cell apoptosis rate,and then fixed 5-ALA photosensitizer 1 mmol/L and selected the control group,5-ALA group,pure illumination group and PDT group.The promoting effect on cell apoptosis was determined by MTT,electron microscope and flow cytometry.The activity of human gastric cancer cells MKN-45 apoptosis related proteins p65 and the downstream gene regulatory protein bcl-2,bax,caspase-3 and caspase-9 were detected by using Western blot method.Results When laser radiation dose was fixed,5-ALA photosensitizer concentrations in promoting gastric cancer cell apoptosis was positively related to the dominant (P < 0.01).When 5-ALA photosensitizer concentration was fixed,laser radiation dose effect had no longer dominant after 25.00 J/cm2 positive correlation (P =0.613).When 5-ALA photosensitizer concentration was fixed in 1 mmol/L,compared to control group,5-ALA group and pure illumination group,the inhibition of the MKN-45 cell proliferation in PDT group was more apparently,apoptosis rate increased obviously,signal pathways in cell apoptosis protein involved in the NF-kappa B p65 expression was reduced,the downstream gene regulation of target protein bcl-2,caspase-3 and caspase-9 expression were reduced,and bax protein expression was increased.Conclusions 5-ALA mediated photodynamic has a strong inhibitory effect on the growth of gastric

  14. 弱激光照射对小鼠骨髓来源巨噬细胞极化的调控作用%The modulation of low-level laser on polarization of mouse bone marrow-derived macrophages

    Institute of Scientific and Technical Information of China (English)

    戴晨; 宋基伟; 梁卓文; 张倩; 张坤; 王哲; 胡学昱

    2016-01-01

    目的 研究不同能量参数的810 nm弱激光照射对于巨噬细胞极化状态的影响.方法 体外分离、培养BALB/c小鼠来源的骨髓巨噬细胞,应用巨噬细胞集落刺激因子(M-CSF)条件性培养基培养的骨髓细胞,流式细胞术检测F4/80表达鉴定培养结果.脂多糖-γ干扰素(LPS-IFN-γ)刺激进行M1细胞极化诱导,反转录PCR检测诱导型一氧化氮合酶(iNOS)、精氨酸酶1(Arg1)、CD86 mRNA水平,Western blot法检测iNOS和Arg1蛋白水平.应用(1、2、3、4)J/cm2的810 nm弱激光对体外培养的M1细胞进行照射,MTT法检测细胞增殖,免疫荧光细胞化学染色检测iNOS、Arg1的表达,反转录PCR检测M1细胞iNOS、Arg1 mRNA水平,Western blot法检测M1细胞iNOS、Arg1蛋白水平.结果 流式细胞术结果证明分离细胞的F4/80阳性率达99.9%.骨髓源性巨噬细胞在LPS-IFN-γ刺激下,高表达iNOS和CD86 mRNA.Western blot法检测发现,给予极化刺激后,骨髓源性巨噬细胞高表达iNOS和CD86蛋白.不同能量的弱激光照射M1型巨噬细胞,MTT法检测发现,(1、2、3)J/cm2弱激光刺激时,M1细胞活力与对照组比较无显著性差异;4 J/cm2刺激时,M1细胞活力降低.免疫荧光细胞化学染色显示,与对照组比较,(1、2) J/cm2照射时,M2型巨噬细胞标志物Arg1阳性细胞数无明显差异,照射剂量为(3、4) J/cm2时,Arg1阻性细胞数显著增多,M1型巨噬细胞标志物iNOS阳性细胞数显著减少.与对照组比较,照射剂量为(1、2)J/cm2时,iNOS及Arg1 mRNA和蛋白表达水平无明显变化,在照射剂量为(3、4) J/cm2时,iNOS mRNA和蛋白水平表达下降,Arg1 mRNA和蛋白水平表达升高.结论 (1、2) J/cm2的810 nm弱激光对于M1型巨噬细胞活力及极化无影响.照射剂量为3 J/cm2时,M1型巨噬细胞可向M2型巨噬细胞极化,且细胞活性无明显变化.但照射能量为4 J/cm2时,M1型细胞虽然可向M2型细胞极化但同时伴有细胞活性降低.

  15. Low-level laser therapy for accelerating orthodontic tooth movement:a Meta-analysis and systematic review%低强度激光促进正畸牙移动的Meta分析和系统评价

    Institute of Scientific and Technical Information of China (English)

    何武林; 周圆; 杨烁; 文军; 褚洪星; 葛孟柯; 段培佳

    2016-01-01

    Objective To evaluate the efficacy and related risk of low level laser therapy (LLLT) for accelerating tooth movement during orthodontic treatment. Methods An extensive electronic search was conducted by two review⁃ers. Randomized controlled trials (RCTs) and quasi⁃RCTs concerning the efficacy of LLLT for accelerating tooth move⁃ment during orthodontic treatment were searched in CENTRAL, PubMed, Medline, Embase, CBM, CNKI. Results Six RCTs and three quasi⁃RCTs, involving 211 patients from six countries, were selected from 173 relevant studies. All nine articles were feasible for the systematic review and meta⁃analysis, five of which were assessed as moderate risk of bias, while the rest were assessed as high risk of bias. The mean difference and the 95%confidence interval (95%CI) of accu⁃mulative moved distance of teeth were observed among all the researches. The results showed that the LLLT could acceler⁃ate orthodontic tooth movement in 7 days (MD=0.19, 95%CI 0.02⁃0.37, P=0.03) and 2 months (MD=1.08, 95%CI 0.16⁃2.01, P=0.02). Moreover, a relatively lower energy density (2.5, 5 and 8 J/cm2) was seemingly more effective than 20 and 25 J/cm2 and even higher ones. Conclusion This systematic review and meta⁃analysis demonstrated that LLLT might speed up the tooth movement in orthodontic treatment. A relatively lower energy density (2.5, 5, and 8 J/cm2) was seemingly more effective than higher ones. More qualified RCTs in human subjects are required.%目的:评价低强度激光治疗(low⁃level laser therapy ,LLLT)促进正畸牙移动的有效性及相关风险。方法依据Cochrane Handbook的规范化要求,检索1980年-2014年Medline、PubMed等数据库,运用Review Manager 5.1软件进行Meta分析。结果共纳入6个国家6篇随机对照试验,3篇不完全随机对照试验,211名患者。偏倚风险评价显示5个研究为中度偏倚风险,4个研究为高度偏倚风险。Meta分析结果显示:与对照组

  16. Comparative study on the clinical effect of venular malformation treated by intense pulsed light, long-pulse Nd:YAG laser and combined therapy with low energy%单用强脉冲光、长脉宽Nd:YAG激光以及低能量下两者联合使用治疗微静脉畸形的临床疗效比较

    Institute of Scientific and Technical Information of China (English)

    吴迪; 鲁严; 周炳荣; 李巍; 曹筱冬; 骆丹

    2013-01-01

    目的:观察单用强脉冲光、长脉宽1064nm Nd:YAG激光以及低能量下两者联合使用治疗微静脉畸形的临床疗效和不良反应.方法:联合应用590~ 1200nm强脉冲光(能量密度12 ~ 16J/cm2,脉宽3.0 ~ 5.0ms)以及长脉宽1064nm Nd:YAG激光(能量密度80 ~ 90J/cm2,脉宽10~ 20ms)治疗51例微静脉畸形患者;并与单独应用强脉冲光(能量密度13~ 20J/cm2)及长脉宽Nd∶ YAG激光(能量密度120 ~ 145J/cm2)治疗结果比较.结果:强脉冲光、长脉宽1064nmNd:YAG激光及低能量下联合使用治疗微静脉畸形的有效率分别为33.1%、40.3%和56.9%,瘢痕发生率分别为0%、10.7%和5.9%.结论:低能量下联合使用强脉冲光及长脉宽1064nm Nd:YAG激光提高了微静脉畸形的有效率,且不良反应小.%Objective To investigate the clinical efficacy and adverse effect of intense pulsed light(IPL),long-pulse 1064nm Nd:YAG laser and combined therapy with low energy for the treatment of venular malformation.Methods Fifty-one patients with venular malformation were treated by combined therapy (590~1200 nm IPL and long-pulse 1064nm Nd:YAG laser).The treatment parameters of IPL were as follows∶12~16 J/cm2 energy density,3.0~5.0ms pulse duration.The treatment parameters of Nd∶YAG laser∶ 80~90 J/cm2 energy density,10~20ms pulse duration.The clinical efficacy and side effect of IPL and Nd:YAG laser were also observed separately.Results The effective rates were 33.1%,40.3% and 56.9% in venular malformation treated only with IPL,Nd:YAG laser and combined therapy respectively.While the incidences of scar were 0%,10.7% and 5.9% respectively.Conclusion IPL combined with long-pulse 1064nm Nd∶YAG laser in low energy is more effective and less adverse effect in the treatment of venular malformation.

  17. Feasibility of predicting the microwave ablation energy for uterine leiomyomas with MRI signal intensity%MRI信号强度预测子宫肌瘤微波消融能量的可行性

    Institute of Scientific and Technical Information of China (English)

    马霞; 张晶; 韩治宇; 蔡剑鸣; 周洪雨; 徐瑞芳; 杨宇; 郝艳丽

    2013-01-01

    目的 探讨根据MR T2WI信号强度预测微波消融子宫肌瘤所需能量的可行性.方法 于超声引导对143例子官肌瘤患者(共197个病灶)行经皮微波消融治疗,对其中42例(49个病灶)于微波消融术前、术后进行盆腔平扫+ MR增强扫描.微波消融功率为50 W,微波天线型号均为T11a.术前根据MR T2WI中子宫肌层信号强度为标准,将子宫肌瘤分为高、等、低信号3组;消融后测量增强MRI中无灌注区体积作为消融体积,对子宫肌瘤微波消融能效因子进行统计学分析.结果 低、等、高信号组子宫肌瘤微波消融平均能效因子分别为(685.01士206.27)J/cm3、(702.70土254.25)J/cm3和(945.12±321.83)J/cm3,高信号组与低信号组比较差异有统计学意义(P=0.015).结论 根据MR T2WI中子宫肌瘤的信号强度可初步预测微波消融所需能量;微波消融中,T2WI呈高信号的子宫肌瘤所需能量高于呈低信号者.%Objective To evaluate the feasibility of signal intensity at MR T2WI for predicting microwave (MW) ablation energy of uterine leiomyoma.Methods Totally 143 patients with 197 uterine leiomyomas who underwent ultrasoundguided percutaneous MW ablation treatment were prospectively observed.Among them,42 patients with 49 uterine leiomyomas received contrast-enhanced MR imaging (ceMRI) before and after MW ablation,the output energy was set at 50 W,and MW antennas T11a were used.Taking MR T2WI signal intensity of myometrium as reference standard,uterine leiomyomas were classified into three groups,i.e.hyperintensity group,isointensity group and hypointensity group.After MW ablation,the volume of nonperfused area on ceMRI was calculated as MW ablation volume.Energy required per unit volume (EPV) was analyzed statistically.Results The mean EPVs were (685.01±206.27)J/cm3 in hypointense group,(702.70±254.25)J/cm3 in isosignal group and (945.12±321.83)J/cm3 in hyperintense group.There was significant difference of EPV between

  18. 强脉冲光对长波紫外线Ⅰ诱导成纤维细胞光损伤的保护作用%Protective effect of intense pulsed light on fibroblast injury induced by UVA Ⅰ

    Institute of Scientific and Technical Information of China (English)

    刘红梅; 刘玮; 赵小忠; 田燕; 袁小英; 王瑞艳

    2011-01-01

    目的 研究强脉冲光(intense pulse light,IPL)对长波紫外线(ultraviolet A,UVA Ⅰ)诱导的正常离体人皮肤成纤维细胞(fibroblast,FB)损伤的保护作用,探讨以IPL为手段的光子嫩肤技术的理论基础.方法 分离并培养人FB,用不同剂量UVA Ⅰ照射FB以诱导细胞光损伤,CCK-8检测其增殖能力的情况,根据预实验结果确定IPL剂量进行照射,流式细胞仪技术枪测细胞周期,Western印迹法检测CylinD1和CDK2蛋白的表达水平.结果 不同剂量的UVA Ⅰ可造成FB的损伤,随着UVA Ⅰ剂量的增加,细胞增殖能力下降,11 J/cm2的剂量可明显导致细胞大量死亡,而7 J/cm2的UVAⅠ对细胞的增殖能力没有明显的影响;经UVA Ⅰ照射2 d后再进行IPL连续照射2 d,细胞增殖活性高于单独UVA Ⅰ处理组,差异具有统计学意义.流式细胞仪检测结果表明该组细胞增殖指数升高.细胞周期蛋白CyclinD1和CDK2的表达水平升高.结论 IPL可通过调节周期蛋白的表达而促进正常FB增殖,从而保护UVAⅠ诱导的FB光损伤,为应用IPL面部美容除皱即光子嫩肤术提供理论依据.%Objective To study the protective effects of intense pulse light (IPL) on the injury of normal human skin fibroblasts (FB) induced by ultraviolet A (UVA Ⅰ ) in vitro and to explore its possible mechanism. Methods The human skin fibroblasts were isolated and cultured, and then irradiated by UVA Ⅰ (9 J/cm2) and IPL (15 J/cm2), respectively. The proliferative ability of the cells were detected by CCK-8. Cell cycle was detected by flow cytometry, and cylin D1 and CDK2 protein expression levels were detected by Western blot. Results Different doses of UVA Ⅰ irradiation caused certain damages of cultured fibroblasts. With the increasing of of UVA Ⅰ dose, cell proliferation was decreased. Cells went to death at the exposure to 11 J/cm2 UVA Ⅰ , while the proliferative activity did not change much at 7 J/cm2 UVA Ⅰ . Cells were treated with UVA

  19. The selection of light emitting diode irradiation parameters for stimulation of human mesenchymal stem cells proliferation

    Science.gov (United States)

    Lewandowski, Rafał; Trafny, ElŻbieta A.; Stepińska, Małgorzata; Gietka, Andrzej; Kotowski, Paweł; Dobrzyńska, Monika; Łapiński, Mariusz P.

    2016-12-01

    Human mesenchymal stem cells (hMSCs) with their vast differentiation potential are very useful for cell-based regenerative medicine. To achieve sufficient numbers of cells for tissue engineering, many different methods have been used to reach the effective increase of cell proliferation. Low-energy red light provided by light emitting diodes (LEDs) have been recently introduced as a method that promoted biomodulation and proliferation of hMSCs in vitro. The purpose of this study was to find the optimum stimulatory dosimetric parameters of LED (630 nm) irradiation on the hMSCs proliferation. The energy density was 2, 3, 4, 10, 20 J/cm2 and the power density used was 7, 17 or 30 mW/cm2. Human MSCs were irradiated with single or triple exposures daily at room temperature and the cell proliferation rate was evaluated during nine days after irradiation. The results showed that after irradiation 4 J/cm2 and 17 mW/cm2 at a single dose the proliferation rate of hMSCs increased on day 5 and 9 (13% and 7%, respectively) when compared to nonirradiated cells. However, triple LED irradiation under the same parameters resulted in the decline in the cell proliferation rate on day 5, but the proliferation rate was at the same level on day 9, when compared with the cell proliferation after irradiation with a single dose. The effect of a single dose irradiation with 4 J/cm2 and 17 mW/cm2 on the proliferation of cells was the highest when the cells were irradiated in phosphate-buffered saline (PBS) instead of MSCGM culture medium.

  20. Islands of surviving cells within necrotic volume at liver induced by PDT

    Science.gov (United States)

    Ferreira, J.; Kurachi, C.; Zucoloto, S.; Castro e Silva, O., Jr.; Bagnato, V. S.

    2009-06-01

    Tissue heterogeneities as well as distinct metabolic status and cellular types within a tumor may results in a nonhomogenous necrosis. The possibility of PDT surviving cells within a treated volume has relevant clinical significance. The major aim of this study was to analyze, on normal rat liver, the cell viability and surviving after PDT. The porphyrin was injected through the cava vein at concentration of 1.5 mg/Kg. The induced necrosis was qualitatively investigated varying the used drug light interval (30 min, 1, 3, 6, 24 and 36 h) and total delivered dose (20, 50, 100, 150 and 200 J/cm2). A diode laser at 630 nm and irradiance of 150 mW/cm2 was employed. The exposed livers were removed after the animals were killed by anesthesia overdose, 30 h after illumination. Slides were processed by HE analysis for the determination of the overall aspects of the necrotic and non-treated liver. We observed necrosis of central vein and presence of surviving cell around the portal triad within the necrotic volume, suggesting PDT-resistant regions of the tissue. Possible hypothesis for the observation may be: the absence of photosensitizer; insufficient light dose (below threshold); and distinct metabolic status in the portal triad microregions decreases oxygen availability to photodynamic reaction. The cells surrounding portal triad presented a higher resistance even when 200 J/cm2 was applied. In contrast, the cells closer to the central vein after 20 J/cm2 were already susceptible to the action of PDT. Different aspects of the problem are presented.

  1. Optical stimulation of the facial nerve: a surgical tool?

    Science.gov (United States)

    Richter, Claus-Peter; Teudt, Ingo Ulrik; Nevel, Adam E.; Izzo, Agnella D.; Walsh, Joseph T., Jr.

    2008-02-01

    One sequela of skull base surgery is the iatrogenic damage to cranial nerves. Devices that stimulate nerves with electric current can assist in the nerve identification. Contemporary devices have two main limitations: (1) the physical contact of the stimulating electrode and (2) the spread of the current through the tissue. In contrast to electrical stimulation, pulsed infrared optical radiation can be used to safely and selectively stimulate neural tissue. Stimulation and screening of the nerve is possible without making physical contact. The gerbil facial nerve was irradiated with 250-μs-long pulses of 2.12 μm radiation delivered via a 600-μm-diameter optical fiber at a repetition rate of 2 Hz. Muscle action potentials were recorded with intradermal electrodes. Nerve samples were examined for possible tissue damage. Eight facial nerves were stimulated with radiant exposures between 0.71-1.77 J/cm2, resulting in compound muscle action potentials (CmAPs) that were simultaneously measured at the m. orbicularis oculi, m. levator nasolabialis, and m. orbicularis oris. Resulting CmAP amplitudes were 0.3-0.4 mV, 0.15-1.4 mV and 0.3-2.3 mV, respectively, depending on the radial location of the optical fiber and the radiant exposure. Individual nerve branches were also stimulated, resulting in CmAP amplitudes between 0.2 and 1.6 mV. Histology revealed tissue damage at radiant exposures of 2.2 J/cm2, but no apparent damage at radiant exposures of 2.0 J/cm2.

  2. The Combination of Direct and Confined Laser Ablation Mechanisms for the Selective Structuring of Thin Silicon Nitride Layers

    Science.gov (United States)

    Rapp, Stephan; Heinrich, Gerrit; Domke, Matthias; Huber, Heinz P.

    In the production process of microelectronic devices and high efficiency solar cells, local openings in thin dielectric layers are required. Instead of photolithographic, laser based processing enables to open these dielectric layers locally in a low-cost mass production step. In this work, thin silicon nitride layers deposited on planar silicon wafers are processed by single infrared Gaussian shaped 660 fs laser pulses. The transparent silicon nitride layer, becoming absorptive at fluences higher than 0.3 J/cm2, is selectively removed by confined ablation at fluences below that value. At pulse peak fluences exceeding 1.0 J/cm2 a "SiNx island"is created by direct ablation in the spot center. In this article, theselective SiNx ablation by a combination of confined and direct laser ablation at the medium pulse peak fluence of 0.5 J/cm2 is investigated. To clarify the influence of the nonlinear absorption in the pulse center, the ablation behavior is investigated by time- and space-resolved pump-probe microscopy experiments. The results showphase changes in the silicon and in the silicon nitride in the first picoseconds after excitation, the ablation onset at around 10 ps and the subsequent mechanical materialmotion after a few nanoseconds. The actual silicon nitride layer removal starts after around 10 ns, whereas confined ablation processes are the driving mechanisms even in the nonlinearly absorbing spot center. A comparison of the energetic ablation efficiency of the SiNx layer system to further dielectric thin films shows no detrimental influence of the nonlinear absorbance.

  3. Effects of He-Ne laser irradiation on chronic atrophic gastritis in rats

    Institute of Scientific and Technical Information of China (English)

    Xue-Hui Shao; Yue-Ping Yang; Jie Dai; Jing-Fang Wu; Ai-Hua Bo

    2005-01-01

    AIM: To study the effects of He-Ne laser irradiation on experimental chronic atrophic gastritis (CAG) in rats.METHODS: Sixty-three male adult Wistar rats were randomly divided into five groups including normal control group, model control group and three different dosages He-Ne laser groups. The chronic atrophic gastritis (CAG)model in rats was made by pouring medicine which was a kind of mixed liquor including 2% sodium salicylate and 30% alcohol down the throat for 8 wk to stimulate rat gastric mucosa, combining with irregular fasting and compulsive sporting as pathogenic factors; 3.36, 4.80, and 6.24J/cm2doses of He-Ne laser were used, respectively for three different treatment groups, once a day for 20 d. The pH value of diluted gastric acid was determined by acidimeter,the histopathological changes such as the inflammatory degrees in gastric mucosa, the morphology and structure of parietal cells were observed, and the thickness of mucosa was measured by micrometer under optical microscope.RESULTS: In model control group, the secretion of gastric acid was little, pathologic morphological changes in gastric mucosa such as thinner mucous, atrophic glands, notable inflammatory infiltration were found. After 3.36 J/cm2 dose of He-Ne laser treatment for 20 d, the secretion of gastric acid was increased (P<0.05), the thickness of gastric mucosa was significantly thicker than that in model control group (P<0.01), the gastric mucosal inflammation cells were decreased (P<0.05). Morphology, structure and volume of the parietal cells all recuperated or were closed to normal.CONCLUSION: 3.36J/cm2 dose of He-Ne laser has a significant effect on CAG in rats.

  4. Photodynamic management of bladder cancer

    Science.gov (United States)

    Johansson, A.; Stepp, H.; Beyer, W.; Pongratz, T.; Sroka, R.; Bader, M.; Kriegmair, M.; Zaak, D.; Waidelich, R.; Karl, A.; Hofstetter, A.; Stief, C.; Baumgartner, R.

    2009-06-01

    Bladder cancer (BC) is among the most expensive oncological diseases. Any improvement in diagnosis or therapy carries a high potential for reducing costs. Fluorescence cystoscopy relies on a selective formation of Protoporphyrin IX (PpIX) or more general photoactive porphyrins (PAP) in malignant urothelium upon instillation of 5-aminolevulinic acid (5-ALA) or its hexyl-derivative h-ALA. Fluorescence cystoscopy equipment has been developed with the aim to compensate for the undesired distortion caused by the tissue optical properties by displaying the red fluorescence simultaneously with the backscattered blue light. Many clinical studies proved a high sensitivity in detecting flat carcinoma in situ and small papillary malignant tumours. As a result, recurrence rates were significantly decreased in most studies. The limitation lies in a low specificity, caused by false positive findings at inflamed bladder wall. Optical coherence tomography (OCT) is currently being investigated as a promising tool to overcome this limitation. H-ALA-PDT (8 or 16 mM h-ALA in 50 ml instillation for 1-2 h, white light source, catheter applicator) has recently been investigated in a phase I study. 17 patients were applied 100 J/cm2 (3 patients received incrementing doses of 25 - 50 - 100 J/cm2) during approx. 1 hour irradiation time in 3 sessions, 6 weeks apart. PDT was performed without any technical complications. Complete photobleaching of the PpIX-fluorescence, as intended, could be achieved in 43 of 45 PDT-sessions receiving 100 J/cm2. The most prominent side effects were postoperative urgency and bladder pain, all symptoms being more severe after 16 mM h-ALA. Preliminary evaluation shows complete response assessed at 3 months after the third PDT-session (i.e. 6 months after first treatment) in 9 of 12 patients. 2 of these patients were free of recurrence until final follow-up at 84 weeks.

  5. Investigations on the Influence of Liquid-Assisted Laser Ablation of NiTi Rotating Target to Improve the Formation Efficiency of Spherical Alloyed NiTi Nanoparticles

    Science.gov (United States)

    Nandini, Patra; Akash, K.; Rohit, Gagrani; Vipul, Singh; Palani, I. A.

    2017-09-01

    In this work, the liquid-assisted laser ablation of NiTi rotating target has been used as a promising technique for generating spherical NiTi alloy nanoparticles with higher formation efficiency. Nd: YAG nanosecond laser with three different laser wavelengths (355, 532 and 1064 nm), three different laser fluences (30, 40 and 50 J/cm2) and three different rotational speeds (10 RPM, 20 RPM and 30 RPM) of target has been used to ablate the nitinol (Ni-55%, Ti-45%) target. The influences of different laser parameters (wavelengths and fluences) and different RPMs have been studied on the size, morphology and formation of alloy nanoparticles. It has been observed that the formation efficiency is maximum (39.9 mg/h) for smaller size nanoparticle ( 40 nm) at 355 nm wavelength, 50 J/cm2 fluence and 10 RPM rotational speed. On the other hand, we find that the formation efficiency (10.5 mg/h) is lowest with a bigger size of nanoparticle ( 110 nm) at 1064 nm wavelength, 50 J/cm2 fluence and 30 RPM speed. Therefore, this is a promising technique to synthesize spherical alloy nanoparticles with higher ablation efficiency. Thus, the higher ablation of particles helps to improve the optical absorption of the colloidal solution as optical absorption has a direct relation with the particle concentration. The shape and size of particles were characterized through SEM and DLS analysis whereas the crystallinity was confirmed through TEM and XRD analysis, respectively. Moreover, the elemental analysis was done with the help of XPS and EDS and optical absorption through UV-Vis spectrum analysis.

  6. Sae regulator factor impairs the response to photodynamic inactivation mediated by Toluidine blue in Staphylococcus aureus.

    Science.gov (United States)

    Gándara, Lautaro; Mamone, Leandro; Dotto, Cristian; Buzzola, Fernanda; Casas, Adriana

    2016-12-01

    Photodynamic inactivation (PDI) involves the combined use of light and a photosensitizer, which, in the presence of oxygen, originates cytotoxic species capable of inactivating bacteria. Since the emergence of multi-resistant bacterial strains is becoming an increasing public health concern, PDI becomes an attractive choice. The aim of this work was to study the differential susceptibility to Toluidine blue (TB) mediated PDI (TB-PDI) of S. aureus mutants (RN6390 and Newman backgrounds) for different key regulators of virulence factors related to some extent to oxidative stress. Complete bacteria eradication of planktonic cultures of RN6390 S. aureus photosensitized with 13μM TB was obtained upon illumination with a low light dose of 4.2J/cm(2) from a non-coherent light source. Similarly, complete cell death was achieved applying 1.3μM TB and 19J/cm(2) light dose, showing that higher light doses can lead to equal cell death employing low photosensitizer concentrations. Interestingly, RN6390 in planktonic culture responded significantly better to TB-PDI than the Newman strain. We showed that deficiencies in rsbU, mgrA (transcription factors related to stress response) or agr (quorum sensing system involved in copper resistance to oxidative stress) did not modify the response of planktonic S. aureus to PDI. On the other hand, the two component system sae impaired the response to TB-PDI through a mechanism not related to the Eap adhesin. More severe conditions were needed to inactivate S. aureus biofilms (0.5mM TB, 157J/cm(2) laser light). In mutant sae biofilms, strain dependant differential susceptibilities are not noticed.

  7. 低强度激光促进正畸牙移动的Meta分析和系统评价

    Institute of Scientific and Technical Information of China (English)

    何武林[1; 周圆[2; 杨烁[1; 文军[1; 褚洪星[1; 葛孟柯[3; 段培佳[1

    2016-01-01

    目的评价低强度激光治疗(low-level laser therapy,LLLT)促进正畸牙移动的有效性及相关风险.方法依据Cochrane Handbook 的规范化要求,检索1980 年-2014 年Medline、PubMed 等数据库,运用ReviewManager 5.1软件进行Meta分析.结果共纳入6个国家6篇随机对照试验,3篇不完全随机对照试验,211名患者.偏倚风险评价显示5个研究为中度偏倚风险,4个研究为高度偏倚风险.Meta 分析结果显示与对照组相比,LLLT 组治疗后7 d,正畸牙移动速度显著增加(MD = 0.19,95% CI 0.02?0.37,P = 0.03),该优势持续到治疗后2个月(MD = 1.08,95% CI 0.16?2.01,P = 0.02);相对于高能量密度(20或25 J/cm2)的LLLT治疗,低能量密度(2.5,5 或8 J/cm2)的LLLT 治疗更为有效.结论低能量密度(2.5、5 或8 J/cm2)的LLLT 能有效促进正畸牙移动,但还需要更多临床随机对照试验支撑.

  8. Effects of Low-Level Laser Therapy on Cutaneous Wound Healings with Three Doses%3种剂量弱激光对大鼠皮肤创伤愈合的影响

    Institute of Scientific and Technical Information of China (English)

    潘振华; 李迎新; 王兴; 陈洪丽; 肖全芝

    2010-01-01

    保持功率密度为10 mW/cm~2不变,用3种剂量(1.2,2.4和3.6 J/cm~2)的630 nm连续输出型弱激光对Wistar大鼠背部皮肤开放型切除创口进行照射,通过测量创口面积和组织病理学分析观察1~4 J/cm~2能量密度范围内,不同剂量的弱激光对创口愈合的影响.创口面积的方差分析(ANOVA)结果表明.空白对照组与各照射剂量组之间不存在统计学差异.而组织病理学分析结果表明,弱激光照射组较空白对照组有以下特点:炎性期持续时间短,肉芽组织出现早,在同一时期,肉芽组织成熟、胶原数量多且其中成熟胶原所占比重大、表皮新生速度快,并且,这种优势随着所用剂量的增加而更加明显.可以认为功率密度为10 mW/cm~2,1~4 J/cm~2能量密度范围内的630 nm弱激光对创伤愈合具有一定的局部促进作用,效果随剂量增加而更好.

  9. Roseomonas alkaliterrae sp. nov., isolated from an alkali geothermal soil sample in Tengchong, Yunnan, South-West China.

    Science.gov (United States)

    Dong, Lei; Ming, Hong; Yin, Yi-Rui; Duan, Yan-Yan; Zhou, En-Min; Nie, Guo-Xing; Feng, Hui-Geng; Liu, Lan; Li, Wen-Jun

    2014-05-01

    An alkalitolerant, thermotolerant and Gram-stain negative bacterium, designated strain YIM 78007(T), was isolated from an alkaline geothermal soil sample from Hehua hot spring, Tengchong, Yunnan province, south-west China. Cells of strain YIM 78007(T) were observed to be aerobic and short rod-shaped. The colonies were observed to be orange-red, convex and circular. 16S rRNA gene sequence-based phylogenetic analysis showed that strain YIM 78007(T) clustered with members of the genus Roseomonas (with similarities from 97.2 to 92.2 %). Optimal growth of strain YIM 78007 occurs at 40-50 °C and pH 8.0-10.0. The predominant ubiquinone was identified as Q-10 and the major fatty acids were identified as C18:1 ω7c and C16:0. The polar lipids were identified as diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine, two unidentified aminolipids and one unknown phospholipid. The G + C content of the genomic DNA was determined to be 63 mol %. The levels of DNA-DNA hybridization relatedness between strain YIM 78007(T) and its closet neighbours (Roseomonas lacus JCM 13283(T) and Roseomonas terrae JCM 14592(T)) were well below the threshold required for the proposal of a novel species. The results of physiological and biochemical characteristics, the phylogenetic analysis, as well as low DNA-DNA hybridization values, allowed the phenotypic and genotypic differentiation of strain YIM 78007(T) from its closest phylogenetic neighbours. Therefore, strain YIM 78007(T) is considered to represent a novel species of the genus Roseomonas, for which the name Roseomonas alkaliterrae sp. nov. is proposed. The type strain is YIM 78007(T) (=BCRC 80644(T) = JCM 19656(T)).

  10. A Low-Level Carbon Dioxide Laser Promotes Fibroblast Proliferation and Migration through Activation of Akt, ERK, and JNK

    Science.gov (United States)

    Shingyochi, Yoshiaki; Kanazawa, Shigeyuki; Tajima, Satoshi; Tanaka, Rica; Mizuno, Hiroshi; Tobita, Morikuni

    2017-01-01

    Background Low-level laser therapy (LLLT) with various types of lasers promotes fibroblast proliferation and migration during the process of wound healing. Although LLLT with a carbon dioxide (CO2) laser was also reported to promote wound healing, the underlying mechanisms at the cellular level have not been previously described. Herein, we investigated the effect of LLLT with a CO2 laser on fibroblast proliferation and migration. Materials and Methods Cultured human dermal fibroblasts were prepared. MTS and cell migration assays were performed with fibroblasts after LLLT with a CO2 laser at various doses (0.1, 0.5, 1.0, 2.0, or 5.0 J/cm2) to observe the effects of LLLT with a CO2 laser on the proliferation and migration of fibroblasts. The non-irradiated group served as the control. Moreover, western blot analysis was performed using fibroblasts after LLLT with a CO2 laser to analyze changes in the activities of Akt, extracellular signal-regulated kinase (ERK), and Jun N-terminal kinase (JNK), which are signaling molecules associated with cell proliferation and migration. Finally, the MTS assay, a cell migration assay, and western blot analysis were performed using fibroblasts treated with inhibitors of Akt, ERK, or JNK before LLLT with a CO2 laser. Results In MTS and cell migration assays, fibroblast proliferation and migration were promoted after LLLT with a CO2 laser at 1.0 J/cm2. Western blot analysis revealed that Akt, ERK, and JNK activities were promoted in fibroblasts after LLLT with a CO2 laser at 1.0 J/cm2. Moreover, inhibition of Akt, ERK, or JNK significantly blocked fibroblast proliferation and migration. Conclusions These findings suggested that LLLT with a CO2 laser would accelerate wound healing by promoting the proliferation and migration of fibroblasts. Activation of Akt, ERK, and JNK was essential for CO2 laser-induced proliferation and migration of fibroblasts. PMID:28045948

  11. Oceanobacillus gochujangensis sp. nov., isolated from gochujang a traditional Korean fermented food.

    Science.gov (United States)

    Jang, Seo-Jung; Kim, Yu-Jin; Lee, Sul-Hee; Park, Young-Seo; Park, Jung-Min; Bai, Dong-Hoon

    2014-12-01

    A Gram-stain-positive, polar flagella-containing, rod-shaped, obligate aerobic, endospore-forming bacterium, strain TK1655(T), was isolated from the traditional Korean food gochujang. The 16S rRNA sequence of strain TK1655(T) was a member of the genus Oceanobacillus similar to that of the type strain of Oceanobacillus oncorhynchi subsp. incaldanensis DSM 16557(T) (97.2%), O. oncorhynchi subsp. oncorhynchi JCM 12661(T) (97.1%), O. locisalsi KCTC 13253(T) (97.0%), and O. sojae JCM 15792(T) (96.9%). Strain TK1655(T) was oxidase and catalase positive. Colonies were circular, smooth, low convex, cream in colour, and measured about 0.5-1.0 mm in diameter. The range for growth was 20-40°C (optimal, 30°C), pH 6.0-10.0 (optimal, 7.0), and 2-16% (w/v) NaCl (optimal, 2%). Additionally, the cells contained meso-DAP, and the predominant isoprenoid quinone was MK-7. The complex polar lipids were consisted of diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), phosphatidylcholine (PC). The major cellular fatty acid components were iso-C15:0, anteiso-C15:0, iso-C16:0, and anteiso-C17:0, and the DNA G+C content was 40.5%. DNA-DNA relatedness of our novel strain and reference strain O. locisalsi KCTC 13253(T), O. oncorhynchi subsp. incaldanensis DSM 16557(T), O. oncorhynchi subsp. oncorhynchi JCM 12661(T) was 45.7, 43.8, and 41.9%. From the results of phenotypic, chemotaxonomic, and phylogenetic analyses of strain TK1655(T), we propose the novel species Oceanobacillus gochujangensis sp. nov. The type strain is TK1655(T) (=KCCM 101304(T) =KCTC 33014(T) =CIP 110582(T) =NBRC 109637(T)).

  12. Modeling of inter-sample variation in flow cytometric data with the joint clustering and matching procedure.

    Science.gov (United States)

    Lee, Sharon X; McLachlan, Geoffrey J; Pyne, Saumyadipta

    2016-01-01

    We present an algorithm for modeling flow cytometry data in the presence of large inter-sample variation. Large-scale cytometry datasets often exhibit some within-class variation due to technical effects such as instrumental differences and variations in data acquisition, as well as subtle biological heterogeneity within the class of samples. Failure to account for such variations in the model may lead to inaccurate matching of populations across a batch of samples and poor performance in classification of unlabeled samples. In this paper, we describe the Joint Clustering and Matching (JCM) procedure for simultaneous segmentation and alignment of cell populations across multiple samples. Under the JCM framework, a multivariate mixture distribution is used to model the distribution of the expressions of a fixed set of markers for each cell in a sample such that the components in the mixture model may correspond to the various populations of cells, which have similar expressions of markers (that is, clusters), in the composition of the sample. For each class of samples, an overall class template is formed by the adoption of random-effects terms to model the inter-sample variation within a class. The construction of a parametric template for each class allows for direct quantification of the differences between the template and each sample, and also between each pair of samples, both within or between classes. The classification of a new unclassified sample is then undertaken by assigning the unclassified sample to the class that minimizes the distance between its fitted mixture density and each class density as provided by the class templates. For illustration, we use a symmetric form of the Kullback-Leibler divergence as a distance measure between two densities, but other distance measures can also be applied. We show and demonstrate on four real datasets how the JCM procedure can be used to carry out the tasks of automated clustering and alignment of cell

  13. Toxicities and early outcomes in a phase 1 trial of photodynamic therapy for premalignant and early stage head and neck tumors.

    Science.gov (United States)

    Ahn, Peter H; Quon, Harry; O'Malley, Bert W; Weinstein, Gregory; Chalian, Ara; Malloy, Kelly; Atkins, Joshua H; Sollecito, Thomas; Greenberg, Martin; McNulty, Sally; Lin, Alexander; Zhu, Timothy C; Finlay, Jarod C; Cengel, Keith; Livolsi, Virginia; Feldman, Michael; Mick, Rosemarie; Busch, Theresa M

    2016-04-01

    Management of early superficial lesions in the head and neck remains complex. We performed a phase 1 trial for high-grade premalignant and early superficial lesions of the head and neck using photodynamic therapy (PDT) with Levulan (ALA). Thirty-five subjects with high grade dysplasia, carcinoma in situ, or microinvasive (⩽1.5mm depth) squamous cell carcinoma were enrolled. Cohorts of 3-6 patients were given escalating intraoperative light doses of 50-200J/cm(2) 4-6h after oral administration of 60mg/kg ALA. Light at 629-635nm was delivered in a continuous (unfractionated) or fractionated (two-part) schema. PDT was delivered to 30/35 subjects, with 29 evaluable. There was one death possibly due to the treatment. The regimen was otherwise tolerable, with a 52% rate of grade 3 mucositis which healed within several weeks. Other toxicities were generally grade 1 or 2, including odynophagia (one grade 4), voice alteration (one grade 3), and photosensitivity reactions. One patient developed grade 5 sepsis. With a median follow-up of 42months, 10 patients (34%) developed local recurrence; 4 of these received 50J/cm(2) and two each received 100, 150, and 200J/cm(2). Ten (34%) patients developed recurrence adjacent to the treated field. There was a 69% complete response rate at 3months. ALA-PDT is well tolerated. Maximum Tolerated Dose appears to be higher than the highest dose used in this study. Longer followup is required to analyze effect of light dose on local recurrence. High marginal recurrence rates suggest use of larger treatment fields. Copyright © 2016 Elsevier Ltd. All rights reserved.

  14. Selective removal of composite sealants with near-UV laser pulses

    Science.gov (United States)

    Louie, Tiffany M.; Jones, Robert S.; Sarma, Anupama V.; Fried, Daniel

    2004-05-01

    It is often necessary to replace pit and fissure sealants and composite restorations. This task is complicated by the necessity for complete removal of the remaining composite to enable suitable adhesion of new composite. Previous studies have shown that lasers pulses from a frequency-tripled Nd:YAG laser (355-nm) can selectively remove residual composite after orthodontic bracket removal on enamel surfaces. UV laser light is preferentially absorbed by polymeric resins and the organic content of the tooth enamel. The objective of this study was to determine if such laser pulses are suitable for selective removal of the old composite from pit and fissure sealants and restorations without damaging surrounding sound tissues. Optical coherence tomography was used to acquire optical cross sections of the occlusal topography and peripheral tooth structure non-destructively before application of the sealants, after sealant application, and after sealant removal with 355-nm laser pulses with intensities ranging from 0-10 J/cm2. Thermocouples were used to monitor the temperature in the pulp chamber during composite removal under clinically relevant ablation rates, i.e., 30 Hz and 30 mJ per laser pulse. At an irradiation intensity of 1.3 J/cm2 pit and fissure sealants were completely removed without visible damage to the underlying enamel. At intensities above 1.5 J/cm2, the laser removes the resin layer while at the same time preferentially etching the surface of the enamel. Temperature excursions in the pulp chamber of extracted teeth was limited to less than 5°C if air-cooling was used during the rapid removal (1-2 min) of sealants, water-cooling was not needed. This is the first presentation of a method for the selective removal of composite restorative materials without damage to the underlying sound tooth structure.

  15. Evaluation of Surface Roughness and Bacterial Adhesion on Tooth Enamel Irradiated With High Intensity Lasers.

    Science.gov (United States)

    Nogueira, Ruchele D; Silva, Camilla B; Lepri, Cesar P; Palma-Dibb, Regina Guenka; Geraldo-Martins, Vinicius R

    2017-01-01

    The aim was to evaluate the surface roughness and bacterial adhesion on enamel irradiated with high intensity lasers, associated or not to a fluoride varnish. Eighty fragments of bovine enamel were equally divided in 8 groups (n=10). Group 1 was not treated and Group 2 received only a 5% fluoride varnish application. The other groups were irradiated with an Er:Cr:YSGG (8.92 J/cm2), an Nd:YAG (84.9 J/cm2) and a diode laser (199.04 J/cm2), associated or not to a 5% fluoride varnish. The surface roughness was measured before and after treatments. Afterward, all samples were incubated in a suspension of S. mutans at 37 °C for 24 h. The colony-forming units (CFU) were counted by a stereoscope and the results were expressed in CFU/mm2. One-way ANOVA and the Tukey´s test compared the roughness data and the Student´s test compared the results obtained in the bacterial adhesion test (a=5%). The results showed that the irradiated samples without varnish presented the same roughness and the same bacterial adhesion that the non-irradiated samples. However, samples irradiated in the presence of fluoride varnish showed higher surface roughness and higher bacterial adhesion than the non-irradiated samples and those irradiated without varnish. Presence of pigments in the varnish increased the lasers' action on the enamel surface, which produced ablation in this hard tissue and significantly increased its surface roughness. For this reason, the enamel's susceptibility to bacterial adhesion was higher when the irradiation of the samples was made in presence of fluoride varnish.

  16. Toxicities and early outcomes in a phase 1 trial of photodynamic therapy for premalignant and early stage head and neck tumors

    Science.gov (United States)

    Ahn, Peter H.; Quon, Harry; O'Malley, Bert W.; Weinstein, Gregory; Chalian, Ara; Malloy, Kelly; Atkins, Joshua H.; Sollecito, Thomas; Greenberg, Martin; McNulty, Sally; Lin, Alexander; Zhu, Timothy C.; Finlay, Jarod C.; Cengel, Keith; Livolsi, Virginia; Feldman, Michael; Mick, Rosemarie; Busch, Theresa M.

    2016-01-01

    SUMMARY Objectives Management of early superficial lesions in the head and neck remains complex. We performed a phase 1 trial for high-grade premalignant and early superficial lesions of the head and neck using photodynamic therapy (PDT) with Levulan (ALA). Materials and methods Thirty-five subjects with high grade dysplasia, carcinoma in situ, or microinvasive (≤1.5 mm depth) squamous cell carcinoma were enrolled. Cohorts of 3–6 patients were given escalating intraoperative light doses of 50–200 J/cm2 4–6 h after oral administration of 60 mg/kg ALA. Light at 629–635 nm was delivered in a continuous (unfractionated) or fractionated (two-part) schema. Results PDT was delivered to 30/35 subjects, with 29 evaluable. There was one death possibly due to the treatment. The regimen was otherwise tolerable, with a 52% rate of grade 3 mucositis which healed within several weeks. Other toxicities were generally grade 1 or 2, including odynophagia (one grade 4), voice alteration (one grade 3), and photosensitivity reactions. One patient developed grade 5 sepsis. With a median follow-up of 42 months, 10 patients (34%) developed local recurrence; 4 of these received 50 J/cm2 and two each received 100, 150, and 200 J/cm2. Ten (34%) patients developed recurrence adjacent to the treated field. There was a 69% complete response rate at 3 months. Conclusions ALA-PDT is well tolerated. Maximum Tolerated Dose appears to be higher than the highest dose used in this study. Longer followup is required to analyze effect of light dose on local recurrence. High marginal recurrence rates suggest use of larger treatment fields. PMID:26865261

  17. Assessment of laser photobiomodulation and polarized light on the healing of cutaneous wounds on euthyroid and hypothyroid induced rats

    Science.gov (United States)

    Ramalho, Luciana Maria Pedreira; Weyll, Barbara Mayoral Pedroso; da Costa Lino, Maíra Dória M.; Ramalho, Maria Jose Pedreira; Barbosa Pinheiro, Antonio Luis

    2010-02-01

    The aim of this study was to assess the influence of low-level laser therapy (LLLT) or polarized light (PL) in cutaneous wound healing of hypothyroid rats at dosages of 20 or 40J/cm2. Bioestimulatory effects of Laser radiation and Polarized light are recognized alternative therapies to improve healing on systemic disease patients, but their usefulness in the improvement of hypothyroidism healing impairment is uncertain till date. Forty Wistar rats were used in this study. Hypothyroidism was propylthiouracil- induced. Standard excisional cutaneous wounds were created without suturing and LLLT (λ660nm, 30mW, φ 3mm) or PL (λ 400-2000nm, 40mW, φ 10mm) was applied every 48 hours up to seven days on experimental groups. The rats were killed on the eighth day when wound contraction was assessed. The healing features were evaluated by light microscopy (H/E and Sirius Red). The cutaneous wounds of hypothyroid rats showed delayed healing process characterized by reduced thickness of epithelial layers, incipient formation of disorganized collagen fibers and wound contraction to a lesser extent (FISHER, p=0.0276), when compared to the euthyroid group. The use of both the Laser and Polarized Light on hypothyroid rats increased the amount of fibroblasts and the thickness of collagen fibers, especially on the L 20J/cm2 group. Euthyroid rats have still demonstrated more regular collagen fibers pattern than hypothyroid rats. It was therefore concluded that hypothyroidism delays wound healing and both Laser photobiomodulation and Polarized Light at 20j/cm2 dosages had improved the healing process in hypothyroid rats.

  18. Effect of low intensity laser therapy in an experimental model of cranio-encephalic trauma in rats

    Science.gov (United States)

    Meneguzzo, Daiane T.; Okada, Cristina Y.; Koike, Márcia K.; Silva, Bomfim A., Jr.; Moreira, Maria S.; Eduardo, Carlos d. P.; Martins Marques, Marcia

    2007-02-01

    The aim of this study was to analyze the effects of phototherapy with low intensity laser on the inflammatory reaction after rat brain injury. Cryogenic injury was performed at the brain of 16 male Wistar rats (250-300g) using a cooper probe at -80º C. Immediately, 24 h and 48 h later, the rats received laser irradiation using a GaAlAs laser (830 nm, 100 mW). The samples were randomly divided into four groups (n= 4 per group): A: control (non- irradiated); B: energy density of 14.28 J/cm2; C: 28.57 J/cm2; D: 42.85 J/cm2. Three days later, the cerebral vascular permeability and the inflammatory cells at the trauma site were evaluated. For vascular permeability analysis, 2 h prior sacrifice an intra vascular injection of Evans blue stain was done in the rats. For inflammatory cells counting, frozen samples were sectioned and the histological slides were stained with Giemsa. The data were compared by either ANOVA or Kruskall-Wallis complemented by the Dunn's test. The irradiated groups presented higher cerebral vascular permeability than controls (A: 2.6 +/- 0.8; B:12.0 +/- 2.0; C: 13.1 +/- 4.1, and D: 12.4 +/- 1.8; p=0.016). The inflammatory cell numbers of irradiated samples were similar to controls (A: 65 +/- 6; B:85 +/- 9; C: 84 +/-14, and D: 83 +/- 3; p=0.443). The data showed that phototherapy with low intensity laser modulates the inflammatory reaction in the brain by increasing the cerebral vascular permeability after a cryogenic trauma.

  19. DNA fragmentation and nuclear phenotype in tendons exposed to low-intensity infrared laser

    Science.gov (United States)

    de Paoli, Flavia; Ramos Cerqueira, Larissa; Martins Ramos, Mayara; Campos, Vera M.; Ferreira-Machado, Samara C.; Geller, Mauro; de Souza da Fonseca, Adenilson

    2015-03-01

    Clinical protocols are recommended in device guidelines outlined for treating many diseases on empirical basis. However, effects of low-intensity infrared lasers at fluences used in clinical protocols on DNA are controversial. Excitation of endogenous chromophores in tissues and free radicals generation could be described as a consequence of laser used. DNA lesions induced by free radicals cause changes in DNA structure, chromatin organization, ploidy degrees and cell death. In this work, we investigated whether low-intensity infrared laser therapy could alter the fibroblasts nuclei characteristics and induce DNA fragmentation. Tendons of Wistar rats were exposed to low-intensity infrared laser (830 nm), at different fluences (1, 5 and 10 J/cm2), in continuous wave (power output of 10mW, power density of 79.6 mW/cm2). Different frequencies were analyzed for the higher fluence (10 J/cm2), at pulsed emission mode (2.5, 250 and 2500 Hz), with the laser source at surface of skin. Geometric, densitometric and textural parameters obtained for Feulgen-stained nuclei by image analysis were used to define nuclear phenotypes. Significant differences were observed on the nuclear phenotype of tendons after exposure to laser, as well as, high cell death percentages was observed for all fluences and frequencies analyzed here, exception 1 J/cm2 fluence. Our results indicate that low-intensity infrared laser can alter geometric, densitometric and textural parameters in tendon fibroblasts nuclei. Laser can also induce DNA fragmentation, chromatin lost and consequently cell death, using fluences, frequencies and emission modes took out from clinical protocols.

  20. Fundamental study on photodynamic therapy for atrial fibrillation: effect of photosensitization reaction parameters on myocardial necrosis in vitro

    Science.gov (United States)

    Ogawa, Emiyu; Ito, Arisa; Arai, Tsunenori

    2012-03-01

    We studied necrotic cell death effect on myocardial cells with photosensitizer existed outside the cells varying photosensitization reaction parameters widely in vitro. We have developed non-thermal ablator with the application of photosensitization reaction for atrial fibrillation. Since laser irradiation is applied shortly after photosensitizer injection, the photosensitization reaction is induced outside the cells. The interaction for the myocardial cells by the photosensitization reaction is not well understood yet on various photosensitization reaction parameters. Rat myocardial cells were cultured in 96 well plates for 7 days. The photosensitization reaction was applied with talaporfin sodium (NPe6) and the semiconductor laser of 663nm wavelength. The average drug light interval was set 8 mins. The photosensitizer concentration and radiant exposure were varied from 5 to 40 μg/ml and 1.2 to 60 J/cm2, respectively. The well bottom was irradiated by the red laser with irradiance of 293 mW/cm2. The photosensitizer fluorescence was monitored during the photosensitization reaction. Alive cell rate was measured by WST assay after 2 hours from the irradiation. In the case of the photosensitizer concentration of 10 μg/ml, the myocardial cells were almost alive even thought 60 J/cm2 in the radiant exposure was applied. In the 15 μg/ml case, the alive cell rate was almost linear relation to the photosensitizer concentration and radiant exposure. We obtained that the threshold for myocardial cell necrosis on the photosensitizer concentration was around 15 μg/ml with 20 J/cm2 in the radiant exposure. This threshold on the photosensitizer concentration was similar to the reported threshold for cancer therapy.

  1. Q开关激光治疗颧部褐青色痣170例疗效分析%The analysis of therapertic effect in 170 cases of naevus fuscocaeruleus zygomaticus treated with Q-switched laser

    Institute of Scientific and Technical Information of China (English)

    黎咏璇; 陈平; 刘必来; 黎宝苗

    2007-01-01

    目的 观察Q开关激光治疗颧部褐青色痣的效果,分析影响疗效的因素.方法 采用美国COHERENT公司生产的Versapulse波长激光器中的Nd:YAG 1064nm波长,能量密度3.0~6.5J/cm2;翠绿宝石755 nm波长,能量密度3.0~6.0 J/cm2;倍频Nd:YAG 532 nm波长,能量密度1.6~2.8 J/cm2.光斑直径2~4 mm.分别治疗2~6次,间隔时间3~12个月,根据治疗前后的照片判定疗效,标准分为Ⅳ级.结果 170例患者中,治愈56例,占33%,显效65例,有效49例,总有效率100%.随访6个月至5年,除13例患者出现短期的色素加深外,170例患者病灶色素消失,无瘢痕遗留及复发.结论 Q开关激光治疗颧部褐青色痣安全有效.

  2. Lactobacillus gorillae sp. nov., isolated from the faeces of captive and wild western lowland gorillas (Gorilla gorilla gorilla).

    Science.gov (United States)

    Tsuchida, Sayaka; Kitahara, Maki; Nguema, Pierre Philippe Mbehang; Norimitsu, Saeko; Fujita, Shiho; Yamagiwa, Juichi; Ngomanda, Alfred; Ohkuma, Moriya; Ushida, Kazunari

    2014-12-01

    Four strains of Gram-staining-positive, anaerobic rods were isolated from the faeces of western lowland gorillas (Gorilla gorilla gorilla). Three strains, KZ01(T), KZ02 and KZ03, were isolated at the Kyoto City Zoo, Japan, and one strain, GG02, was isolated in the Moukalaba-Doudou National Park, Gabon. These strains were investigated taxonomically. These strains belonged to the Lactobacillus reuteri phylogenetic group according to phylogenetic analysis based on 16S rRNA gene sequences and specific phenotypic characteristics. Phylogenetic analysis of their 16S rRNA gene sequences revealed that strains KZ01(T), KZ02, KZ03 and GG02 formed a single monophyletic cluster and had a distinct line of descent. Based on sequence similarity of the 16S rRNA gene, Lactobacillus fermentum JCM 1173(T) (96.6 %) was the closest neighbour to these novel strains, although it was clear that these strains belonged to a different species. Partial pheS sequences also supported these relationships. DNA-DNA relatedness between strain KZ01(T) and L. fermentum JCM 1173(T) was less than 22 % and the DNA G+C content of strain KZ01(T) was 50.7 mol%. The cell-wall peptidoglycan type was A4β (l-Orn-d-Asp) and the major fatty acids were C16 : 0, C18 : 1ω9c and C19 : 1 cyclo 9,10. Therefore, based on phylogenetic, phenotypic and physiological evidence, these strains represent a novel species of the genus Lactobacillus, for which the name Lactobacillus gorillae sp. nov. is proposed. The type strain is KZ01(T) ( = JCM 19575(T) = DSM 28356(T)).

  3. Purification and amino acid sequence of a bacteriocins produced by Lactobacillus salivarius K7 isolated from chicken intestine

    Directory of Open Access Journals (Sweden)

    Kenji Sonomoto

    2006-03-01

    Full Text Available A bacteriocin-producing strain, Lactobacillus K7, was isolated from a chicken intestine. The inhibitory activity was determined by spot-on-lawn technique. Identification of the strain was performed by morphological, biochemical (API 50 CH kit and molecular genetic (16S rDNA basis. Bacteriocin purification processes were carried out by amberlite adsorption, cation exchange and reverse-phase high perform- ance liquid chromatography. N-terminal amino acid sequences were performed by Edman degradation. Molecular mass was determined by electrospray-ionization (ESI mass spectrometry (MS. Lactobacillus K7 showed inhibitory activity against Lactobacillus sakei subsp. sakei JCM 1157T, Leuconostoc mesenteroides subsp. mesenteroides JCM 6124T and Bacillus coagulans JCM 2257T. This strain was identified as Lb. salivarius. The antimicrobial substance was destroyed by proteolytic enzymes, indicating its proteinaceous structure designated as a bacteriocin type. The purification of bacteriocin by amberlite adsorption, cation exchange, and reverse-phase chromatography resulted in only one single active peak, which was designated FK22. Molecular weight of this fraction was 4331.70 Da. By amino acid sequence, this peptide was homology to Abp 118 beta produced by Lb. salivarius UCC118. In addition, Lb. salivarius UCC118 produced 2-peptide bacteriocin, which was Abp 118 alpha and beta. Based on the partial amino acid sequences of Abp 118 beta, specific primers were designed from nucleotide sequences according to data from GenBank. The result showed that the deduced peptide was high homology to 2-peptide bacteriocin, Abp 118 alpha and beta.

  4. Femtosecond damage threshold of multilayer metal films

    Science.gov (United States)

    Ibrahim, Wael M. G.; Elsayed-Ali, Hani E.; Shinn, Michelle D.; Bonner, Carl E.

    2003-05-01

    With the availability of terawatt laser systems with subpicosecond pulses, laser damage to optical components has become the limiting factor for further increases in the output peak power. Evaluation of different material structures in accordance to their suitability for high-power laser systems is essential. Multi-shot damage experiments, using 110 fs laser pulses at 800 nm, on polycrystalline single layer gold films and multi-layer (gold-vanadium, and gold-titanium) films were conducted. The laser incident fluence was varied, in both cases, from 0.1 to 0.6 J/cm2. No evidence of surface damage was apparent in the gold sample up to a fluence of 0.3 J/cm2. The multilayer sample experienced the onset of surface damage at the lowest fluence value used of 0.1 J/cm2. Damage results are in contrast with the time resolved ultrafast thermoreflectivity measurements that revealed a reduction of the thermoreflectivity signal for the multilayer films. This decrease in the thermoreflectivity signal signifies a reduction in the surface electron temperature that should translate in a lower lattice temperature at the later stage. Hence, one should expect a higher damage threshold for the multilayer samples. Comparison of the experimental results with the predictions of the Two-Temperature Model (TTM) is presented. The damage threshold of the single layer gold film corresponds to the melting threshold predicted by the model. In contrast to the single layer gold film, the multi-layer sample damaged at almost one third the damage threshold predicted by the TTM model. Possible damage mechanisms leading to the early onset of damage for the multilayer films are discussed.

  5. Responses of He-Ne laser irradiation on agronomical characters and chlorogenic acid content of brinjal (Solanum melongena L.) var. Mattu Gulla.

    Science.gov (United States)

    Swathy, Surendrababu P; Kiran, Kodsara Ramachandra; Rao, Madhura S; Mahato, Krishna K; Rao, Mattu Radhakrishna; Satyamoorthy, Kapaettu; Muthusamy, Annamalai

    2016-11-01

    Exposure to laser irradiation on seeds brings about the changes in agronomical characteristics of the plants. Solanum melongena L. var. Mattu Gulla, a variety of brinjal is of high economic value due to its unique colour and flavour. The aim of the study was to understand the influence of Helium-Neon (He-Ne) laser irradiation on agronomical characters of Solanum melongena L. var. Mattu Gulla in the field conditions. Various growth characteristics including seed germination percentage, survival rate, plant height, number of branches, and flowers and fruits were estimated during different developmental stages of the brinjal. In addition, the chlorogenic acid content of fruits obtained from the laser irradiated seeds were quantified using reversed-phase high-performance liquid chromatography (RP- HPLC). The plants from the seeds irradiated with different doses (20, 25 and 30J/cm(2)) of He-Ne laser showed significant enhancement on the growth characteristics when compared to the non-irradiated control groups. He-Ne laser irradiation also improved the yield characteristics of the plants significantly in in vivo conditions in comparison with control group. 3-(4, 5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was performed using methanolic extract of matured fruit of Mattu Gulla on HepG2 and fibroblast cell lines. The IC50 values of fruit extract from laser irradiated groups were found to be similar to non-irradiated control groups. Chlorogenic acid content was found to be higher in 20J/cm(2) and lower in 30J/cm(2) treated fruit tissue. The current study thus elucidates the role of He-Ne laser as a biostimulator on brinjal var. Mattu Gulla not only in the in vitro conditions but also in the in vivo field conditions.

  6. Preliminary Investigations on Therapy Thresholds for Laser Dosimetry, Cryogen Spray Cooling Duration, and Treatment Cycles for Laser Cartilage Reshaping in the New Zealand White Rabbit Auricle

    Science.gov (United States)

    Chlebicki, Cara A.; Protsenko, Dmitry E.; Wong, Brian J.

    2014-01-01

    Previous studies have demonstrated the feasibility of laser irradiation (λ=1.45 μm) in tandem with cryogen spray cooling (CSC) to reshape rabbit auricular cartilage using total energy density of 14 J/cm2. The aim of this study was to further explore and identify the dosimetry parameter space for laser output energy, CSC duration, and treatment cycles required to achieve shape change while limiting skin and cartilage injury. Ten New Zealand white rabbits were treated with the 1.45 μm diode laser combined with cryogen spray cooling (Candela Smoothbeam™, Candela Co., Wayland, MA). The ear's central portion was bent around a cylindrical jig and irradiated in consecutive spots of 6 mm diameter (13 J/cm2 or 14 J/cm2 per spot) along 3 rows encompassing the bend. CSC was delivered during irradiation in cycles consisting of 25-35 ms. At thin and thick portions of the ear, 4-7 and 6-10 treatment cycles were delivered, respectively. After surgery, ears were examined and splinted for 6 weeks. Treatment parameters resulting in acceptable (Grades 1 & 2) and unacceptable (Grade 3) skin injuries for thick and thin regions were identified and shape change was observed. Confocal and histological analysis of cartilage tissue revealed several outcomes correlating to laser dosimetry, CSC duration, and treatment cycles. These outcomes included expansion of cartilage layers (thickening), partial cartilage injuries, and full thickness cartilage injuries. We determined therapy thresholds for laser output energy, cryogen spray cooling duration, and treatment cycles in the rabbit auricular model. These parameters are a starting point for future clinical procedures aimed at correcting external ear deformities. PMID:24202858

  7. Protection against UV-induced toxicity and lack of mutagenicity of Antarctic Sanionia uncinata.

    Science.gov (United States)

    Fernandes, A S; Mazzei, J L; Oliveira, C G; Evangelista, H; Marques, M R C; Ferraz, E R A; Felzenszwalb, I

    2017-02-01

    Antarctica moss Sanionia uncinata (Hedw.) Loeske is exposed in situ to damaging levels of ultraviolet (UV) radiation. This moss has the ability to respond to UV radiation exposure producing secondary metabolites such as flavonoids, and has been recommended as a potential source of photoprotective compounds and antioxidants. The aim of the present paper was to investigate the free-radical scavenging activity and mutagenic and photomutagenic properties of methanolic (ME), hydroethanolic (HE) and ethanolic (EE) extracts of S. uncinata. The phenolic contents were evaluated by high-performance liquid chromatography (HPLC) and spectrophotometry. The findings showed that ME and EE presented the highest phenolic contents and inhibited free radical-scavenging activity against 2,2'-diphenyl-1 picrylhydrazyl (DPPH) and the HPLC analysis indicated several classes of phenolic acids and flavonoids. The sun protection factors (SPF) were determined by an in vitro method and the results showed significant values. The SPF values of BZ-3 at 50μg/mL increased significantly in association with ME, HE and EE. The extracts did not induce mutagenicity in auxotrophic Salmonella typhimurium histidine and photomutagenicity was not detected in the TA102 and TA104 strains after exposure to UV-A at doses of up to 6.5J/cm(2) for the TA102 strain and up to 0.24J/cm(2) for the TA104 strain. In addition, with the exception of ME, all the extracts induced photoprotective effects in the presence of the TA104 strain at 0.04J/cm(2). The present results suggest that S. uncinata extracts did not induce photomutation and showed promise for photoprotection against the photobiological and ROS-inducing effects of the UV-A radiation.

  8. Effect of energy density on color stability in dental resin composites under accelerated aging.

    Science.gov (United States)

    Zamarripa, Eliezer; Ancona, Adriana L; D'Accorso, Norma B; Macchi, Ricardo L; Abate, Pablo F

    2008-01-01

    The effects of the energy density that is used for polymerization on properties of dental resin composites are well known. However, few studies relate color stability to this factor. The aim of this study was to assess color changes (deltaE*), in vitro, in terms of accelerated aging under UV exposure of specimens prepared with different energy densities. Four commercial dental resin composites were included in the study. Thirty six specimens were prepared for each one of them, following the procedure established by ISO 4049 Standard, and assigned to three groups: A (3.75 J/cm2), B (9 J/cm2), C (24 J/cm2). Each group was further subdivided into four subgroups: 1 (no aging), 2 (500 hours aging), 3 (1000 hours aging) and 4 (1500 hours aging). The results were analyzed by means of ANOVA and Tukey's test (alpha = 0.05) to determine the effect of the factors. Correlation was performed in order to determine the possible relationship among variables. Energy density is not a significant factor in color stability. However aging is directly proportional to color changes. deltaE* depends on filler size; hybrid material presented deltaE* of 2.1(0.5), 2.4(0.6) and 3.3(0.3) at 500, 1000 and 1500 hours of accelerated aging respectively, and nanofilled material showed deltaE* of 3.0(0.6), 4.5(1.2) and 5.9(0.6) at the same times respectively. It can be concluded that deltaE* does not depend on energy density; however other factors are involved in color change. Further studies in this area are warranted.

  9. The effect of blue light on periodontal biofilm growth in vitro.

    Science.gov (United States)

    Fontana, Carla R; Song, Xiaoqing; Polymeri, Angeliki; Goodson, J Max; Wang, Xiaoshan; Soukos, Nikolaos S

    2015-11-01

    We have previously shown that blue light eliminates the black-pigmented oral bacteria Porphyromonas gingivalis, Prevotella intermedia, Prevotella nigrescens, and Prevotella melaninogenica. In the present study, the in vitro photosensitivity of the above black-pigmented microorganisms and four Fusobacteria species (Fusobacterium nucleatum ss. nucleatum, F. nucleatum ss. vincentii, F. nucleatum ss. polymorphum, Fusobacterium periodonticum) was investigated in pure cultures and human dental plaque suspensions. We also tested the hypothesis that phototargeting the above eight key periodontopathogens in plaque-derived biofilms in vitro would control growth within the dental biofilm environment. Cultures of the eight bacteria were exposed to blue light at 455 nm with power density of 80 mW/cm2 and energy fluence of 4.8 J/cm2. High-performance liquid chromatography (HPLC) analysis of bacteria was performed to demonstrate the presence and amounts of porphyrin molecules within microorganisms. Suspensions of human dental plaque bacteria were also exposed once to blue light at 455 nm with power density of 50 mW/cm2 and energy fluence of 12 J/cm2. Microbial biofilms developed from the same plaque were exposed to 455 nm blue light at 50 mW/cm2 once daily for 4 min (12 J/cm2) over a period of 3 days (4 exposures) in order to investigate the cumulative action of phototherapy on the eight photosensitive pathogens as well as on biofilm growth. Bacterial growth was evaluated using the colony-forming unit (CFU) assay. The selective phototargeting of pathogens was studied using whole genomic probes in the checkerboard DNA-DNA format. In cultures, all eight species showed significant growth reduction (p biofilms, respectively, (p biofilms. The cumulative blue light treatment suppressed biofilm growth in vitro. This may introduce a new avenue of prophylactic treatment for periodontal diseases.

  10. Photocatalytic inactivation of biofilms on bioactive dental adhesives.

    Science.gov (United States)

    Cai, Yanling; Strømme, Maria; Melhus, Asa; Engqvist, Håkan; Welch, Ken

    2014-01-01

    Biofilms are the most prevalent mode of microbial life in nature and are 10-1000 times more resistant to antibiotics than planktonic bacteria. Persistent biofilm growth associated at the margin of a dental restoration often leads to secondary caries, which remains a challenge in restorative dentistry. In this work, we present the first in vitro evaluation of on-demand photocatalytic inactivation of biofilm on a novel dental adhesive containing TiO2 nanoparticles. Streptococcus mutans biofilm was cultured on this photocatalytic surface for 16 h before photocatalytic treatment with ultraviolet-A (UV-A) light. UV-A doses ranging from 3 to 43 J/cm(2) were applied to the surface and the resulting viability of biofilms was evaluated with a metabolic activity assay incorporating phenol red that provided a quantitative measure of the reduction in viability due to the photocatalytic treatments. We show that an UV-A irradiation dose of 8.4 J/cm(2) leads to one order of magnitude reduction in the number of biofilm bacteria on the surface of the dental adhesives while as much as 5-6 orders of magnitude reduction in the corresponding number can be achieved with a dose of 43 J/cm(2). This material maintains its functional properties as an adhesive in restorative dentistry while offering the possibility of a novel dental procedure in the treatment or prevention of bacterial infections via on-demand UV-A irradiation. Similar materials could be developed for the treatment of additional indications such as peri-implantits.

  11. Transfer of Pantoea citrea, Pantoea punctata and Pantoea terrea to the genus Tatumella emend. as Tatumella citrea comb. nov., Tatumella punctata comb. nov. and Tatumella terrea comb. nov. and description of Tatumella morbirosei sp. nov.

    Science.gov (United States)

    Brady, Carrie L; Venter, Stephanus N; Cleenwerck, Ilse; Vandemeulebroecke, Katrien; De Vos, Paul; Coutinho, Teresa A

    2010-03-01

    Pantoea citrea, Pantoea punctata and Pantoea terrea were described for strains isolated from fruit and soil originating in Japan. These three 'Japanese' species have been shown to be phylogenetically distant from other species of the genus Pantoea. It has been observed previously that, using multilocus sequence analysis (MLSA), the 'Japanese' species consistently formed a distinct clade with an extended branch length, casting doubt on the inclusion of these species within the genus Pantoea. Furthermore, the 'Japanese' species are closely related to Tatumella ptyseos, strains of which originate from human clinical specimens. DNA-DNA hybridization and phenotypic tests confirmed the observed phylogenetic distance of P. citrea, P. punctata and P. terrea from the genus Pantoea and the affiliation of these species with Tatumella. In addition, strains causing pink disease of pineapple, identified previously as P. citrea , were shown to represent a separate species by using 16S rRNA gene sequence analysis, and MLSA and DNA-DNA hybridization data. The name Tatumella morbirosei sp. nov. with the type strain LMG 23360(T) (=BD 878(T)=NCPPB 4036(T)=CMC6(T)) is proposed to accommodate these strains. The new combinations Tatumella citrea (Kageyama et al. 1992) comb. nov. (type strain, SHS 2003(T)=ATCC 31623(T)=BD 875( T)=CCUG 30156(T)=CIP 105599(T)=DSM 13699(T)=JCM 8882(T)=LMG 22049(T)), Tatumella punctata (Kageyama et al. 1992) comb. nov. (type strain, SHS 2006(T)=ATCC 31626(T)=BD 876( T)=CCUG 30159(T)=CIP 105598(T)=DSM 13700(T)=JCM 8885(T)=LMG 22050(T)) and Tatumella terrea (Kageyama et al. 1992) comb. nov. (type strain, SHS 2008(T)=ATCC 31628(T)=BD 877(T)=CCUG 30161(T)=CIP 105600(T)=DSM 13701(T)=JCM 8887(T)=LMG 22051(T)) are proposed for P. citrea, P. punctata and P. terrea , respectively.

  12. Efficacy of low-level laser therapy for the treatment of burning mouth syndrome: a randomized, controlled trial

    Science.gov (United States)

    Spanemberg, Juliana Cassol; López, José López; de Figueiredo, Maria Antonia Zancanaro; Cherubini, Karen; Salum, Fernanda Gonçalves

    2015-09-01

    The aim of the present study was to assess the effect of low-level laser therapy (LLLT) in the treatment of burning mouth syndrome (BMS). A diode laser was used in 78 BMS patients who were randomly assigned into four groups: IR1W, n=20 (830 nm, 100 mW, 5 J, 176 J/cm2, 50 s, LLLT weekly sessions, 10 sessions); IR3W, n=20 (830 nm, 100 mW, 5 J, 176 J/cm2, 50 s, three LLLT weekly sessions, 9 sessions); red laser, n=19 (685 nm, 35 mW, 2 J, 72 J/cm2, 58 s, three LLLT weekly sessions, 9 sessions); and control-group (CG), n=19. Symptoms were assessed at the end of the treatment and eight weeks later; quality of life related to oral health was assessed using the Oral Health Impact Profile (OHIP-14). Statistical analysis was carried out using repeated measures analysis of variance followed by the posthoc Tukey test. There was significant reduction of the symptoms in all groups at the end of the treatment, which was maintained in the follow-up. The scores of the IR1W and IR3W laser groups differed significantly from those of the CG. There was also a decrease in the OHIP-14 scores in the four groups. The IR3W laser group scores differed significantly from those of the CG. LLLT reduces the symptoms of BMS and may be an alternative therapeutic strategy for the relief of symptoms in patients with BMS.

  13. Inactivation kinetics and factors of variability in the pulsed light treatment of Listeria innocua cells.

    Science.gov (United States)

    Uesugi, Aaron R; Woodling, Sarah E; Moraru, Carmen I

    2007-11-01

    Pulsed light (PL) treatment can effectively reduce microbial populations in clear substrates and on surfaces, but its effectiveness varies as a function of substrate or treatment-related factors. For PL to be successfully adopted by the food industry, all factors of influence, as well as the inactivation kinetics for the microorganisms of concern, must be elucidated. In this study, the inactivation kinetics of Listeria innocua and the effect of inoculum size on PL inactivation were investigated. Stainless steel coupons (50.8 by 101.6 mm) of defined surface properties and transparent glass chamber slides (25.4 by 50.8 by 10 mm) were each inoculated with 1 ml of aqueous suspensions of L. innocua containing inoculum populations of up to 10(9) CFU. The thickness of the liquid layer in the glass slides was 1.16 mm. The inoculated substrates were exposed to PL treatment of up to 17 J/cm2 in a static PL chamber equipped with a pulsed Xenon lamp. Survivors were recovered and enumerated by both standard plate counting and most-probable-number procedures. The data indicated that in clear liquids, PL resulted in more than a 6-log reduction of L. innocua after a 12-J/cm2 treatment, regardless of the initial inoculum size. For the stainless steel surfaces, less than a 4-log reduction after a 12-J/cm2 treatment and a noticeable effect of substrate characteristics and inoculum size on inactivation were observed. The survivor curves showed pronounced tailing for all substrates used in the study. The Weibull model accurately predicted the survivor ratios for the PL treatment of L. innocua in clear liquids, with a shape and scale parameter of 0.33 and 3.01, respectively. The Weibull model resulted in significant overestimation of PL effectiveness for the stainless steel substrates, where the influence of various substrate properties and inoculum level on inactivation was significant.

  14. Photodynamic inactivation of drug-resistant bacteria isolated from diabetic foot ulcers

    Directory of Open Access Journals (Sweden)

    M Fateh

    2011-05-01

    Full Text Available Background and Objectives: Due to the extensive use of antibiotics, the spread of drug-resistant bacteria is one of the most worrisome threats to public health. One strategy that can be used to overcome potential shortcomings might be the inactivation of these organisms by photodynamic therapy. In this study, we have investigated whether drug-resistant wound-associated organisms (Staphylococcus aureus, Staphylococcus epidermidis and Escherichia coli are sensitive to lethal photosensitization using the dye methylene blue coupled with laser light of 660 nm."nMaterials and Methods: Effect of photosensitizer concentration (25, 50, 100 μg/ml and laser light dose (27.3, 54.6 and 109.2 J/cm2 on lethal photosensitization was investigated."nResults: All species were susceptible to killing by photodynamic inactivation. The bactericidal effect was not dependent on the concentration of methylene blue but it was dependent on the light dose. Methylene blue photosensitization using red laser light (109.2 J/cm2 was able to achieve reductions of 99.03% and 98.95% in the viable counts of S. aureus and S. epidermidis (using starting concentrations of 104-105 CFU/ml. Eradication of 92.23% were obtained for E. coli (initial concentration 104-105 CFU/ml photosensitized by the red light (109.2 J/cm2."nConclusion: These findings imply that MB in combination with red light may be an effective means of eradicating drug-resistant bacteria from wounds.

  15. Actinoplanes lichenis sp. nov., isolated from lichen.

    Science.gov (United States)

    Phongsopitanun, Wongsakorn; Matsumoto, Atsuko; Inahashi, Yuki; Kudo, Takuji; Mori, Mihoko; Shiomi, Kazuro; Takahashi, Yoko; Tanasupawat, Somboon

    2016-01-01

    A novel species of the genus Actinoplanes, strain LDG1-22T, for which we propose the name Actinoplanes lichenis sp. nov., was isolated from a lichen sample collected from tree bark in Thailand. The taxonomic position of the species has been described based on a polyphasic approach. Strain LDG1-22T produced irregular sporangia on agar media. It contained meso-diaminopimelic acid in the cell-wall peptidoglycan. The major menaquinone was MK-9(H4); the polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylinositol, phosphatidylinositol mannosides and phosphatidylglycerol. Whole-cell hydrolysates contained ribose, glucose, mannose and small amounts of arabinose and xylose. The major cellular fatty acids were anteiso-C15 : 0 (31.2 %) and iso-C16 : 0 (14.2 %). Mycolic acids were absent. The G+C content was 73.6 %. 16S rRNA gene sequence analysis of strain LDG1-22T showed highest similarity (98.8 %) to Actinoplanes friuliensis DSM 45797T and it clustered with Actinoplanes nipponensis JCM 3264T and Actinoplanes missouriensis JCM 3121T in phylogenetic tree analysis. On the basis of the phenotypic characteristics and DNA-DNA relatedness, strain LDG1-22T could be distinguished from related species of the genus Actinoplanes and so represents a novel species of this genus. The type strain of Actinoplanes lichenis sp. nov. is LDG1-22T ( = JCM 30485T = TISTR 2343T = PCU 344T).

  16. 620nm低能量红光对骨髓间充质干细胞成骨分化的影响%620 nm Red Light Enhances Osteogenic Differentiation in Mesenchymal Stem Cells

    Institute of Scientific and Technical Information of China (English)

    彭飞; 郑亚东; 徐西强; 虞冀哲; 吴华

    2011-01-01

    To investigate the effect of red light emitted from light-emitting diode (LED) on bone marrow Mesenchymal stem cells (MSCs) cultured with osteogenic supplements, MSCs were divided into four groups and each group was irradiated at dose of 0, 1,2, and 4 J/cm2. Cellular proliferation was evaluated by using CCK-8. The alkaline phosphatase (ALP) activity and mineralization formation were monitored as indicators of MSCs' differentiation toward osteoblasts. As a result, the cellular proliferation was decelerated in 4 J/cm2 group, wherears red light increased ALP activity and mineralized nodule formation. In conclusion, noncoherent red light from LED can enhance osteogenic differentiation and decelerates proliferation of MSCs in media with osteogenic supplements.%为研究发光二极管(LED)发射的红光对大鼠骨髓间充质干细胞的成骨分化的影响,体外培养SD大鼠骨髓间充质干细胞,620 nm波长的LED置于细胞上方2 cm处,照射剂量分别为0,1,2和4J/cm2.采用CCK-8法检测照射后第2、4天的增殖活性,碱性磷酸酶(ALP)活性试剂盒与von kossa矿化结节染色法检测骨髓间充值干细胞的成骨分化情况.结果表明在第4天,4 J/cm2的照射剂量致细胞的活性明显降低(P<0.05)并促进ALP活性明显增加(P<0.05),von kossa染色显示红光照射组的钙盐沉积较多.综上所述,620 nmLED非相干红光可有效促进骨髓间充质干细胞的成骨分化.

  17. Bartonella jaculi sp. nov., Bartonella callosciuri sp. nov., Bartonella pachyuromydis sp. nov. and Bartonella acomydis sp. nov., isolated from wild Rodentia.

    Science.gov (United States)

    Sato, Shingo; Kabeya, Hidenori; Fujinaga, Yuta; Inoue, Kai; Une, Yumi; Yoshikawa, Yasuhiro; Maruyama, Soichi

    2013-05-01

    Four novel strains of members of the genus Bartonella, OY2-1(T), BR11-1(T), FN15-2(T) and KS2-1(T), were isolated from the blood of wild-captured greater Egyptian jerboa (Jaculus orientalis), plantain squirrel (Callosciurus notatus), fat-tailed gerbil (Pachyuromys duprasi) and golden spiny mouse (Acomys russatus). All the animals were imported to Japan as pets from Egypt, Thailand and the Netherlands. The phenotypic characterization (growth conditions, incubation periods, biochemical properties and cell morphologies), DNA G+C contents (37.4 mol% for strain OY2-1(T), 35.5 mol% for strain BR11-1(T), 35.7 mol% for strain FN15-2(T) and 37.2 mol% for strain KS2-1(T)), and sequence analyses of the 16S rRNA genes indicated that those strains belong to the genus Bartonella. Sequence comparisons of gltA and rpoB genes suggested that all of the strains should be classified as novel species of the genus Bartonella. In phylogenetic trees based on the concatenated sequences of five loci, including the 16S rRNA, ftsZ, gltA and rpoB genes and the ITS region, and on the concatenated deduced amino acid sequences of three housekeeping genes (ftsZ, gltA and rpoB), all strains formed distinct clades and had unique mammalian hosts that could be discriminated from other known species of the genus Bartonella. These data strongly support the hypothesis that strains OY2-1(T), BR11-1(T), FN15-2(T) and KS2-1(T) should be classified as representing novel species of the genus Bartonella. The names Bartonella jaculi sp. nov., Bartonella callosciuri sp. nov., Bartonella pachyuromydis sp. nov. and Bartonella acomydis sp. nov. are proposed for these novel species. Type strains of Bartonella jaculi sp. nov., Bartonella callosciuri sp. nov., Bartonella pachyuromydis sp. nov. and Bartonella acomydis sp. nov. are OY2-1(T) ( = JCM 17712(T) = KCTC 23655(T)), BR11-1(T) ( = JCM 17709(T) = KCTC 23909(T)), FN15-2(T) ( = JCM 17714(T) = KCTC 23657(T)) and KS2-1(T) ( = JCM 17706(T

  18. In vitro studies of theophylline-induced changes in Na, K and Cl transport in hen (Gallus domesticus) colon suggesting bidirectional, basolateral NaK2Cl cotransport

    DEFF Research Database (Denmark)

    Andersen, Vibeke; Munck, B G; Munck, L K;

    1990-01-01

    1. In isolated mucosa from a NaCl-loaded hen theophylline stimulates both unidirectional chloride fluxes (JmsCl and JsmCl). Conductive and electroneutral exchange processes, besides a bumetanide-sensitive, rheogenic process contribute. 2. The bumetanide-sensitive fraction of the theophylline......-induced delta JcmCl is sodium-dependent. 3. Incubation in nominally K(+)-free solutions reduces the bumetanide-sensitive fraction delta JsmCl more than treatment with ouabain. 4. With respect to chloride the bumetanide-sensitive fraction of delta JsmCl has a Hill coefficient of 1.93 +/- 0.03, a Jmax of 12...

  19. A new photopolymerizable holographic recording material based on acrylamide and N-hydroxymethyl acrylamide

    Institute of Scientific and Technical Information of China (English)

    Gong Qiao-Xia; Wang Su-Lian; Huang Ming-Ju; Gan Fu-Xi

    2005-01-01

    A new polyvinylalcohol-based photopolymeric holographic recording material has been developed. The recording is obtained by the copolymerization of acrylamide and N-hydroxymethyl acrylamide. Diffraction efficiencies near 50% are obtained with energetic exposure of 80m J/cm2. N-hydroxymethyl acrylamide can improve the optical quality of the film. With the increase of the concentration of N-hydroxymethyl acrylamide, the flatness of the film increases, scattering reduces and the straight image is clearer with a small distortion. The postexposure effect on the grating is also studied.The diffraction efficiency of grating increases further during postexposure, gradient of monomer exists after exposure.

  20. Desulfuromonas svalbardensis sp nov and Desulfuromusa ferrireducens sp nov., psychrophilic, Fe(III)-reducing bacteria isolated from Arctic sediments, Svalbard

    DEFF Research Database (Denmark)

    Vandieken, V.; Mussmann, M.; Niemann, Hans Henrik

    2006-01-01

    . As alternatives to Fe(III), they reduced fumarate, S-0 and Mn(IV). Based on 16S rRNA gene sequence similarity, strain 112(T) was most closely related to Desulfuromonas acetoxidans (97.0%) and Desulfuromonas thiophila NZ27(T) (95.5 %), and strain 102(T) to Malonomonas rubra Gra Mal 1(T) (96.3%) and Desulfuromusa...... succinoxidans Gylac(T) (95.9%) within the Deltaproteobacteria. Strains 112(T) and 102(T) therefore represent novel species, for which the names Desulfuromonas svalbardensis sp. nov. (type strain 112(T) = DSM 16958(T) = JCM 12927(T)) and Desulfuromusa ferrireducens sp. nov. (type strain 102(T) = DSM 16956 (T...

  1. Progress towards Rapid Detection of Measles Vaccine Strains: a Tool To Inform Public Health Interventions.

    Science.gov (United States)

    Hacker, Jill K

    2017-03-01

    Rapid differentiation of vaccine from wild-type strains in suspect measles cases is a valuable epidemiological tool that informs the public health response to this highly infectious disease. Few public health laboratories sequence measles virus-positive specimens to determine genotype, and the vaccine-specific real-time reverse transcriptase PCR (rRT-PCR) assay described by F. Roy et al. (J. Clin. Microbiol. 55:735-743, 2017, https://doi.org/10.1128/JCM.01879-16) offers a rapid, easily adoptable method to identify measles vaccine strains in suspect cases.

  2. In Situ Laser Activation of Electrochemical Kinetics at Carbon Electrodes

    Science.gov (United States)

    1994-05-31

    used for diffusion problems, and resembles the approach used by Steinbeck et al. [101, As shown schematically in Fig. 1, the distance into the solid...sponding to a &Tp of 3920 K. Steinbeck et al. [10) note a threshold of 0.63 J/cm 2 for a ruby laser (694 nm, 30 ns), corresponding to 3890 K. Despite...1988) 1850. 9 T. Strein and A.G. Ewing, Anal. Chem., 63 (1991) 194. 10 J. Steinbeck , G. Braunstein, M.S. Dresselhaus, T. Venkatesan and D.C. Jacobson

  3. Laser ablation dynamics and production of thin films of lysozyme

    DEFF Research Database (Denmark)

    Canulescu, Stela; Schou, Jørgen; Amoruso, S.;

    produced thin films of average thickness up to 300 nm, which not only contained a significant amount of intact molecules, but also maintained the bioactivity. These films were produced by a nanosecond laser in the UV regime at 355 nm with 2 J/cm2. The surprising fact that these molecules can be transferred....... This is the first time the ablation by fs-lasers of a protein has been recorded quantitatively. Films of lysozyme produced by fs-laser irradiation were analyzed by MALDI and a significant number of intact molecules in the films with fs-laser deposition was found as well....

  4. Estudo do efeito da irradiação com laser em baixa intensidade no metabolismo celular das glândulas salivares e na glicemia de ratas diabéticas induzidas por estreptozotocina

    OpenAIRE

    Alyne Simões

    2008-01-01

    Considerando que o diabetes experimental altera a morfologia e função das glândulas salivares de ratos, o objetivo deste estudo foi analisar o efeito da irradiação com laser em baixa intensidade no metabolismo das glândulas parótidas (GP) e submandibulares (GSM) de ratas diabéticas, assim como analisar a glicemia destes animais. Ratas Wistar com aproximadamente 195 g foram divididas em diabéticas (D) e controles (C), e subdivididas de acordo com a dose de irradiação recebida: C-D0 (0 J/cm2), ...

  5. DNA damage in wounded, hypoxic and acidotic human skin fibroblast cell cultures after low laser irradiation

    Science.gov (United States)

    Hawkins Evans, D.; Mbene, A.; Zungu, I.; Houreld, N.; Abrahamse, H.

    2009-02-01

    Phototherapy has become more popular and widely used in the treatment of a variety of medical conditions. To ensure sound results as evidence of its effectiveness, well designed experiments must be conducted when determining the effect of phototherapy. Cell culture models such as hypoxic, acidotic and wounded cell cultures simulating different disease conditions including ischemic heart disease, diabetes and wound healing were used to determine the effect of laser irradiation on the genetic integrity of the cell. Even though phototherapy has been found to be beneficial in a wide spectrum of conditions, it has been shown to induce DNA damage. However, this damage appears to be repairable. The risk lies in the fact that phototherapy may help the medical condition initially but damage DNA at the same time leaving undetected damage that may result in late onset, more severe, induced medical conditions including cancer. Human skin fibroblasts were cultured and used to induce a wound (by the central scratch model), hypoxic (by incubation in an anaerobic jar, 95% N2 and 5% O2) and acidotic (reducing the pH of the media to 6.7) conditions. Different models were irradiated using a Helium-Neon (632.8 nm) laser with a power density of 2.07 mW/cm2 and a fluence of 5 J/cm2 or 16 J/cm2. The effect of the irradiation was determined using the Comet assay 1 and 24 h after irradiation. In addition, the Comet assay was performed with the addition of formamidopyrimidine glycosylase (FPG) obviating strand brakes in oxidized bases at a high fluence of 16 J/cm2. A significant increase in DNA damage was seen in all three injured models at both 1 and 24 h post-irradiation when compared to the normal un-injured cells. However, when compared to non-irradiated controls the acidotic model showed a significant decrease in DNA damage 24 h after irradiation indicating the possible induction of cellular DNA repair mechanisms. When wounded cells were irradiated with higher fluences of 16 J/cm2

  6. Ablation and ultrafast dynamics of zinc selenide under femtosecond laser irradiation

    Institute of Scientific and Technical Information of China (English)

    Xiaofeng Wang; Tianqing Jia; Xiaoxi Li; Chengbin Li; Donghai Feng; Haiyi Sun; Shizhen Xu; Zhizhan Xu

    2005-01-01

    The ablation in zinc selenide (ZnSe) crystal is studied by using 150-fs, 800-nm laser system. The images of the ablation pit measured by scanning electronic microscope (SEM) show no thermal stress and melting dynamics. The threshold fluence is measured to be 0.7 J/cm2. The ultrafast ablation dynamics is studied by using pump and probe method. The result suggests that optical breakdown and ultrafast melting take place in ZnSe irradiated under femtosecond laser pulses.

  7. Complicated Urinary Tract Infections: What's a Lab To Do?

    Science.gov (United States)

    2016-01-01

    The article by Price et al. in this issue (T. K. Price et al., J Clin Microbiol 54:1216–1222, 2016, http://dx.doi.org/10.1128/JCM.00044-16) advocates for the use of a larger inoculum when culturing urine obtained by “in-and-out” catheterization in a selected female population. Their findings and the resulting challenges will afford clinical microbiologists and specialty physicians an opportunity to review what will or should be done with the additional microbiological culture data. PMID:26962089

  8. 细菌衍生黑素对长波紫外线诱导人皮肤成纤维细胞凋亡和坏死的保护%Evaluating the photoprotection of bacteria-derived melanin against UVA-induced apoptosis and necrosis in cultured fibroblasts from both normal and DNA repair-deficient patient

    Institute of Scientific and Technical Information of China (English)

    周琼; 雷铁池; 耿晶; 陈向东; 车巍; 饶立; 徐世正

    2008-01-01

    目的:探讨细菌衍生黑素(b-melanin)对长波紫外线(UVA)诱导人成纤维细胞凋亡和坏死产生的光保护作用,为今后将其用作皮肤光保护剂提供依据.方法:正常人成纤维细胞(NL-FB)和着色性干皮病患者成纤维细胞(XP-FB)经UVA照射12 h后,以四甲基偶氮唑蓝(MTT)法检测细胞存活率,Hoechst33258染色法观察早期凋亡细胞核形态学变化.二氯荧光素二酯(DCFH-DA)标记法测定细胞内活性氧基(ROS)水平.结果:UVA照射诱导细胞的半数致死剂量,XP-FB大约为30 J/cm2,而NL-FB>40 J/cm2.为了观察不同浓度(0,25,50,100,200,400,和800 μg/mL)的b-melanin是否对细胞存在光保护作用,给予半数致死剂量(30 J/cm2)UVA照射后,经100~400 μg/mL b-melanin处理的XP-FB的细胞存活率均较未处理组明显增高(P<0.01),而NL-FB的细胞存活率变化不明显.细胞内ROS测定结果显示100、400 μg/mL的b-melanin能明显清除UVA诱导产生的ROS.100 μg/mL b-melanin即能阻止非致死剂量(16 J/cm2)UVA照射诱导的早期凋亡细胞核改变.结论:b-melanin能对UVA诱导人成纤维细胞凋亡和坏死提供有效的光保护,这一作用很可能关系到b-melanin对ROS的清除.本研究还首次提出核酸切除修复机制缺陷的XP-FB是一敏感的可用于测试UVA光损伤作用的体外细胞模型.

  9. Candida auris sp. nov., a novel ascomycetous yeast isolated from the external ear canal of an inpatient in a Japanese hospital.

    Science.gov (United States)

    Satoh, Kazuo; Makimura, Koichi; Hasumi, Yayoi; Nishiyama, Yayoi; Uchida, Katsuhisa; Yamaguchi, Hideyo

    2009-01-01

    A single strain of a novel ascomycetous yeast species belonging to the genus Candida was isolated from the external ear canal of an inpatient in a Japanese hospital. Analyses of the 26S rDNA D1/D2 domain, nuclear ribosomal DNA ITS region sequences, and chemotaxonomic studies indicated that this strain represents a new species with a close phylogenetic relationship to Candida ruelliae and Candida haemulonii in the Metschnikowiaceae clade. This strain grew well at 40 degrees C, but showed slow and weak growth at 42 degrees C. The taxonomic description of Candida auris sp. nov. is proposed (type strain JCM15448T= CBS10913T= DSM21092T).

  10. Formation of x-ray Newton’s rings from nano-scale spallation shells of metals in laser ablation

    Directory of Open Access Journals (Sweden)

    Masaharu Nishikino

    2017-01-01

    Full Text Available The initial stages of the femtosecond (fs laser ablation process of gold, platinum, and tungsten were observed by single-shot soft x-ray imaging technique. The formation and evolution of soft x-ray Newton’s rings (NRs were found for the first time. The soft x-ray NRs are caused by the interference between the bulk ablated surface and nanometer-scale thin spallation layer; they originate from the metal surface at pump energy fluence of around 1 J/cm2 and work as a flying soft x-ray beam splitter.

  11. Formation of x-ray Newton's rings from nano-scale spallation shells of metals in laser ablation

    Science.gov (United States)

    Nishikino, Masaharu; Hasegawa, Noboru; Tomita, Takuro; Minami, Yasuo; Eyama, Takashi; Kakimoto, Naoya; Izutsu, Rui; Baba, Motoyoshi; Kawachi, Tetsuya; Suemoto, Tohru

    2017-01-01

    The initial stages of the femtosecond (fs) laser ablation process of gold, platinum, and tungsten were observed by single-shot soft x-ray imaging technique. The formation and evolution of soft x-ray Newton's rings (NRs) were found for the first time. The soft x-ray NRs are caused by the interference between the bulk ablated surface and nanometer-scale thin spallation layer; they originate from the metal surface at pump energy fluence of around 1 J/cm2 and work as a flying soft x-ray beam splitter.

  12. Light-Induced Mutagenicity in Salmonella TA102 and Genotoxicity/Cytotoxicity in Human T-cells by 3,3’-Dichlorobenzidine: A Chemical Used in the Manufacture of Dyes and Pigments and in Tattoo Inks

    Science.gov (United States)

    Wang, Lei; Yan, Jian; Hardy, William; Mosley, Charity; Wang, Shuguang; Yu, Hongtao

    2013-01-01

    3,3’-Dichlorobenzidine (DCB) is used primarily as an intermediate in the manufacture of diarylide yellow or azo red pigments for printing inks, textiles, paints, and plastics. It is also used in tattoo inks. In this article, we investigate light-induced toxicity of DCB in both bacteria and human Jurkat T-cells. DCB itself is not toxic or mutagenic to Salmonella typhimurium TA102, but is photomutagenic at concentrations as low as 2 µM and phototoxic at concentrations >100 µM when the bacteria is exposed to DCB and light at the same time (1.2 J/cm2 of UVA and 2.1 J/cm2 of visible light). Furthermore, DCB is both photocytotoxic and photogenotoxic to human Jurkat T-cells. Under a constant light irradiation dose of 2.3 J/cm2 of UVA and 4.2 J/cm2 of visible light, it causes the Jurkat T-cells to become non-viable in a DCB dose-dependent manner and only 40% viable cells remaining at DCB concentrations higher than 50 µM. At the same time, DNA fragmentation is observed for the cells exposed to both DCB and light, determined by single cell gel electrophoresis (Comet assay). As much as 8 % of the cellular DNA is fragmented when exposed to 200 µM DCB and light irradiation. This suggests that DCB can penetrate the cell membrane and enter the cell. Upon light activation, DCB in the cells can cause various cellular damages, including DNA fragmentation, leading to non-viable Jurkat T-cells. It appears, though, non-viable cells may not be caused solely by fragmentation of cellular DNA, but other damages such as to proteins and cell membranes, or other forms of DNA damage such as alkylation that does not cause DNA to fragment, may also be involved. Therefore, persons exposed to DCB through environmental contamination or through tattoo piercing using DCB-contaminated inks must not only concern about its toxicity without exposing to light, but also about its phototoxicity. PMID:15664269

  13. High Throughput Optical Lithography by Scanning a Massive Array of Bowtie Aperture Antennas at Near-Field

    Science.gov (United States)

    2015-11-03

    near-field gap distance. The ISPI system uses a different wavelength of laser light that is insensitive to the photoresist to avoid interfering with the...subsequent fine alignment and gap control. In the lithography system, a frequency-tripled diode-pumped solid state UV laser (wavelength = 355 nm...1.57 μ J/cm2 and a linear scanning speed of 1 μ m/s. This higher laser fluence was used to ensure patterns are produced by all the antennas since

  14. Biostimulative effects of 809 nm diode laser on cutaneous skin wounds

    Science.gov (United States)

    Solmaz, Hakan; Gülsoy, Murat; Ülgen, Yekta

    2015-03-01

    The use of low-level laser therapy (LLLT) for therapeutic purposes in medicine has become widespread recently. There are many studies in literature supporting the idea of therapeutic effects of laser irradiation on biological tissues. The aim of this study is to investigate the biostimulative effect of 809nm infrared laser irradiation on the healing process of cutaneous incisional skin wounds. 3-4 months old male Wistar Albino rats weighing 300 to 350 gr were used throughout this study. Lowlevel laser therapy was applied through local irradiation of 809nm infrared laser on open skin incisional wounds of 1 cm length. Each animal had six identical incisions on their right and left dorsal region symmetrical to each other. The wounds were separated into three groups of control, 1 J/cm2 and 3 J/cm2 of laser irradiation. Two of these six wounds were kept as control group and did not receive any laser application. Rest of the incisions was irradiated with continuous diode laser of 809nm in wavelength and 20mW power output. Two of them were subjected to laser irradiation of 1 J/cm2 and the other two were subjected to laser light with energy density of 3 J/cm2. Biostimulation effects of irradiation were studied by means of tensile strength tests and histological examinations. Wounded skin samples were morphologically examined and removed for mechanical and histological examinations at days 3, 5 and 7 following the laser applications. Three of the six fragments of skin incisions including a portion of peripheral healthy tissue from each animal were subjected to mechanical tests by means of a universal tensile test machine, whereas the other three samples were embedded in paraffin and stained with hematoxylin and eosin for histological examinations. The findings of the study show that tissue repair following laser irradiation of 809nm has been accelerated in terms of tissue morphology, strength and cellular content. These results seem to be consistent with the results of many

  15. Poly(ethylene terephthalate) surface modification by deep UV (172 nm) irradiation

    Energy Technology Data Exchange (ETDEWEB)

    Zhengmao Zhua; Michael J. Kelley

    2004-09-01

    The prospects of obtaining desired surface-mediated characteristics while retaining bulk-mediated physical properties and avoiding potential environmental issues with wet chemical technology lends considerable appeal to photochemical approaches. We investigated the response of poly(ethylene terephthalate) to 172 nm UV from a xenon excimer lamp in the absence of oxygen, using XPS, ToF/SIMS, and AFM. The main effects are increasing loss of a C=O moiety and carboxylic acid production without effect on topography up to a total fluence of 16 J/cm2. Above this level no further change in surface chemistry was evident, but surfaces became rougher, suggesting the onset of etching.

  16. Use of the immunomodulative influence of low-level laser radiation in the treatment of an autoimmune thyroiditis

    Science.gov (United States)

    Mikhailov, V. A.; Alexandrova, O. A.; Denisov, I. N.

    2000-06-01

    Use of LLLT for 42 patients with an autoimmune thyroiditis has shown that the helper function of lymphocytes has decreased, the suppressive activity has increased, the quantity of B-lymphocytes has decreased and the immunoregulative index has been normalized. The effect of LLLT application was active about 4 months in 78 percent of the patients. Soft semiconductor laser was used. The radiation was in the IR range of spectrum, wavelength - 890 nm. The technique included cutaneous irradiation of the thymus projection zones, vascular junction and thyroid gland. The total doze was made 2.42 J/cm2.

  17. Inference of coastal submergence from the study of beach rock off Visakhapatnam

    Digital Repository Service at National Institute of Oceanography (India)

    Rajamanickam, G.V.; Rao, K.M.; Rao, T.C.S.

    , river delta, British Columbia, Sedimentology, v. 12, pp. 27-46. Hling, LV., (1954) Bahamian Calcareous sands, Bull. Assoc. Petro Geol. V. 38, pp. 1-95. Katz, A. & Friedman, G.M., (I965) The preparation of stained acetate peels for the stUdy of carbonate...!. Sci. Acad., V. 38, 1 & 2, pp. 9-20. Stehli, F.G., and Hower, .J., (1961) Mineralogy and early diagenesis of carbonate sediments, Jour. Sed. Petro V.31, pp. 358-371. Taylor, J.C.M. and Hling, LV., (1969) Holocene intertidal calcium carbonate cementation...

  18. Effects of Magnetic Induction Intensity on Microstructure and Properties of Electromagnetic Centrifugal Casting High Cr Cast Iron%磁感应强度对电磁离心铸造高铬铸铁的影响

    Institute of Scientific and Technical Information of China (English)

    孙凯; 付拴拴; 张鸿雪

    2012-01-01

    为了提高高铬铸铁衬板的力学性能,使用电磁离心铸造浇注,并和常规重力离心铸造的试样进行了对比.结果表明,电磁离心铸造获得的试样组织明显细化,晶粒数量增多,晶粒尺寸细小,力学性能提高.当离心转速为1 500 r/min,磁感应强度为0.5T时,电磁离心铸造铸态试样的硬度(HRC)为55.3,冲击韧度为6.87 J/cm2;热处理后的硬度(HRC)为65.3,冲击韧度达到7.3 J/cm2.试样硬度比常规铸造试样提高了约10%,冲击韧度提高了约9%,相对耐磨性提高了约5%.%In order to improve mechanical properties ol the high chromium cast iron liner, the specimens were produced by electromagnetic centrifugal casting, and were comparatively analyzed with conventional casting specimens. The results show that microstructure of the electromagnetic centrifugal casting specimens is refined significantly, and grains are increased with the decrease of the grain size, evidently improving the mechanical properties of the specimens. With centrifugal velocity of 1 500 r/min and magnetic induction intensity of 0. 5 T, the hardness and impacting toughness of the electromagnetic centrifugal casting specimens reach HKC 55. 3 and 6. 87 J/cm2, respectively, and after heat treatment, hardness and impacting toughness reach HRC65. 3 and 7. 3 J/cm2 .respectively. Compared with those of the conventional casting ones, hardness, impacting toughness and relative wear resistance of the specimens prepared are increased by 10% , 8% and 5% , respectively.

  19. Autologous bone marrow transplantation by photodynamic therapy

    Science.gov (United States)

    Gulliya, Kirpal S.

    1992-06-01

    Simultaneous exposure of Merocyanine 540 dye containing cultured tumor cells to 514-nm laser light (93.6 J/cm2) results in virtually complete cell destruction. Under identical conditions, 40% of the normal progenitor (CFU-GM) cells survive the treatment. Laser- photoradiation treated, cultured breast cancer cells also were killed, and living tumor cells could not be detected by clonogenic assays or by anti-cytokeratin monoclonal antibody method. Thus, laser photoradiation therapy could be useful for purging of contaminating tumor cells from autologous bone marrow.

  20. Deposition of matrix-free fullerene films with improved morphology by matrix-assisted pulsed laser evaporation (MAPLE)

    DEFF Research Database (Denmark)

    Canulescu, Stela; Schou, Jørgen; Fæster, Søren;

    2013-01-01

    Thin films of C60 were deposited by matrix-assisted pulsed laser evaporation (MAPLE) from a frozen target of anisole with 0.67 wt% C60. Above a fluence of 1.5 J/cm2 the C60 films are strongly non-uniform and are resulting from transfer of matrix-droplets containing fullerenes. At low fluence...... the fullerene molecules in the films are intact, the surface morphology is substantially improved and there are no measurable traces of the matrix molecules in the film. This may indicate a regime of dominant evaporation at low fluence which merges into the MAPLE regime of liquid ejection of the host matrix...

  1. Formation of silicon nanocrystals in silicon carbide using flash lamp annealing

    Science.gov (United States)

    Weiss, Charlotte; Schnabel, Manuel; Prucnal, Slawomir; Hofmann, Johannes; Reichert, Andreas; Fehrenbach, Tobias; Skorupa, Wolfgang; Janz, Stefan

    2016-09-01

    During the formation of Si nanocrystals (Si NC) in SixC1-x layers via solid-phase crystallization, the unintended formation of nanocrystalline SiC reduces the minority carrier lifetime and therefore the performance of SixC1-x as an absorber layer in solar cells. A significant reduction in the annealing time may suppress the crystallization of the SiC matrix while maintaining the formation of Si NC. In this study, we investigated the crystallization of stoichiometric SiC and Si-rich SiC using conventional rapid thermal annealing (RTA) and nonequilibrium millisecond range flash lamp annealing (FLA). The investigated SixC1-x films were prepared by plasma-enhanced chemical vapor deposition and annealed at temperatures from 700 °C to 1100 °C for RTA and at flash energies between 34 J/cm2 and 62 J/cm2 for FLA. Grazing incidence X-ray diffraction and Fourier transformed infrared spectroscopy were conducted to investigate hydrogen effusion, Si and SiC NC growth, and SiC crystallinity. Both the Si content and the choice of the annealing process affect the crystallization behavior. It is shown that under certain conditions, FLA can be successfully utilized for the formation of Si NC in a SiC matrix, which closely resembles Si NC in a SiC matrix achieved by RTA. The samples must have excess Si, and the flash energy should not exceed 40 J/cm2 and 47 J/cm2 for Si0.63C0.37 and Si0.77C0.23 samples, respectively. Under these conditions, FLA succeeds in producing Si NC of a given size in less crystalline SiC than RTA does. This result is discussed in terms of nucleation and crystal growth using classical crystallization theory. For FLA and RTA samples, an opposite relationship between NC size and Si content was observed and attributed either to the dependence of H effusion on Si content or to the optical absorption properties of the materials, which also depend on the Si content.

  2. Ablation of carbide materials with femtosecond pulses

    Science.gov (United States)

    Dumitru, Gabriel; Romano, Valerio; Weber, Heinz P.; Sentis, Marc; Marine, Wladimir

    2003-01-01

    The response of cemented tungsten carbide and of titanium carbonitride was investigated with respect to damage and ablation properties, under interaction with ultrashort laser pulses. These carbide materials present high microhardness and are of significant interest for tribological applications. The experiments were carried out in air with a commercial Ti:sapphire laser at energy densities on the target up to 6.5 J/cm 2. The irradiated target surfaces were analyzed with optical, SEM and AFM techniques and the damage and ablation threshold values were determined using the measured spot diameters and the calculated incident energy density distributions.

  3. Towards Universal Screening for Toxoplasmosis: Rapid, Cost-Effective, and Simultaneous Detection of Anti-Toxoplasma IgG, IgM, and IgA Antibodies by Use of Very Small Serum Volumes.

    Science.gov (United States)

    Augustine, Swinburne A J

    2016-07-01

    Rapid, cost-effective, and early determination of the serological status of potentially infected individuals, particularly pregnant women, can be critical in preventing life-threatening infections and subsequent fetal congenital abnormalities. An article in this issue of the Journal of Clinical Microbiology (X. Li, C. Pomares, G. Gonfrier, B. Koh, S. Zhu, M. Gong, J. G. Montoya, and H. Dai, J Clin Microbiol 54:1726-1733, 2016, http://dx.doi.org/10.1128/JCM.03371-15) describes an innovative multiplexed immunoassay that offers a path toward universal screening.

  4. 乌鲁木齐地区127例志愿者紫外线最小红斑量测定%Determination of minimal erythema dose of ultraviolet in 127 volunteers from Urumqi region

    Institute of Scientific and Technical Information of China (English)

    丁媛; 向芳; 于世荣; 梁俊琴; 康晓静; 普雄明

    2012-01-01

    Objective To determine the normal range of minimal erythema dose (MED) for ultraviolet A (UVA) and B (UVB) in volunteers from Urumqi region.Methods One hundred and twenty-seven volunteers including healthy subjects and patients with noninflammatory skin disorders were enrolled in this study.SUV-1000 type UV simulator was used as the light source to determine MED of UVA and UVB in these subjects.Results These subjects included 48 persons with Fitzpatrick skin type Ⅲ,79 with Fitzpatrick skin type Ⅳ,51 males and 76 females.The median MED value for UVA and UVB was 38.1 J/cm2 and 31.8 mJ/cm2 respectively in subjects with skin type Ⅲ,59.16 J/cm2 and 48.00 mJ/cm2 respectively in subjects with skin type Ⅳ.Significantly lower median MED values of UVA (both P < 0.01) and UVB (both P < 0.05) were observed in the male and female subjects with skin type Ⅲ compared with those with skin type Ⅳ.The male subjects showed a significantly higher median UVA-MED value (59.16 J/cm2 vs.41.10 J/cm2,P < 0.05),but a similar UVB-MED value (39.60 mJ/cm2 vs.35.55 mJ/cm2,P > 0.05) compared with the female subjects.No significant difference was observed in the median value of UVA-or UVB-MED in subjects with skin type Ⅲ or Ⅳ between Han and Uygur nationality (all P > 0.05).Also,no correlation was found in the median value of UVA-or UVB-MED with age or duration of outdoor exposure in the male or female subjects (all P > 0.05).The lower reference limit was 33.38 J/cm2 for UVA-MED and 27.90 mJ/cm2 for UVB-MED in the population in Urumqi region.Conclusion Skin phototype may be an important determinant of MED.%目的 测定乌鲁木齐地区志愿者长波紫外线(UVA)、中波紫外线(UVB)的最小红斑量(MED).方法 以SUV-1000型日光紫外线模拟器为光源,测定127例志愿者UVA-MED、UVB-MED.结果 Ⅲ型皮肤48例,UVA-MED中位数为38.10 J/cm2,UVB-MED中位数为31.80 mJ/cm2;Ⅳ型皮肤79例,UVA-MED中位数为59.16 J/cm2,UVB-MED中位数为48.00 mJ/cm2.

  5. Quantitative effects of rapid heating on soot-particle sizing through analysis of two-pulse LII

    Science.gov (United States)

    Cenker, E.; Roberts, W. L.

    2017-03-01

    During the rapid laser pulse heating and consecutive cooling in laser-induced incandescence (LII), soot particles may undergo thermal annealing and sublimation processes which lead to a permanent change in its optical properties and its primary particle size, respectively. Overall, effects of these two processes on soot and LII model-based particle sizing are investigated by measuring the two-color time-resolved (2C-TiRe) LII signal decay from in-flame soot after two consecutive laser pulses at 1064-nm wavelength. Experiments are carried out on a non-premixed laminar ethylene/air flame from a Santoro burner with both low and moderate laser fluences suitable for particle sizing. The probe volume is set to a radial position close to the flame axis where the soot particles are known to be immature or less graphitic. With the first pulse, soot is pre-heated, and the LII signal after the consecutive second pulse is used for analysis. The two-color incandescence emission technique is used for the pyrometric determination of the LII-heated peak soot temperature at the second pulse. A new LII simulation tool is developed which accounts for particle heating via absorption and annealing, and cooling via sublimation, conduction, and radiation with various existing sub-models from the literature. The same approach of using two laser pulses is implemented in the simulations. Measurements indicate that thermal annealing and associated absorption enhancement becomes important at laser fluences above 0.17 J/cm2 for the immature in-flame soot. After a heating pulse at 0.33 J/cm2, the increase of the soot absorption function is calculated as 35% using the temperature measured at the second pulse and an absorption model based on the Rayleigh approximation. Present annealing model, on the other hand, predicts graphitization of soot even in the absence of laser heating at typical flame temperatures. Recorded experimental LII signal decays and LII-heated peak soot temperature

  6. Laser ablation deposition measurements from silver and nickel

    DEFF Research Database (Denmark)

    Svendsen, Winnie Edith; Ellegaard, Ole; Schou, Jørgen

    1996-01-01

    The deposition rate for laser ablated metals has been studied in a standard geometry for fluences up to 20 J/cm(2). The rate for silver and nickel is a few percent of a monolayer per pulse at the laser wavelengths 532 nm and 355 nm. The rate for nickel is significantly higher than that for silver...... at 532 nm, whereas the rate for the two metals is similar at 355 nm. This behaviour disagrees with calculations based on the thermal properties at low intensities as well as predictions based on formation of an absorbing plasma at high intensities. The deposition rate falls strongly with increasing...

  7. Tsukamurella hongkongensis sp. nov. and Tsukamurella sinensis sp. nov., isolated from patients with keratitis, catheter-related bacteraemia and conjunctivitis.

    Science.gov (United States)

    Teng, Jade L L; Tang, Ying; Wong, Samson S Y; Ngan, Antonio H Y; Huang, Yi; Tsang, Chi-Ching; Choi, Garnet K Y; Lau, Susanna K P; Woo, Patrick C Y

    2016-01-01

    Three bacterial strains, HKU51T, HKU52T and HKU53, were isolated from a conjunctival swab, corneal scraping and blood culture of three patients in Hong Kong with conjunctivitis, keratitis and catheter-related bacteraemia, respectively. Cells were Gram-stain-positive, aerobic, catalase-positive, non-sporulating and non-motile bacilli. The three strains had unique biochemical profiles that were distinguishable from those of closely related species of the genus Tsukamurella. Fatty acids, mycolic acids, cell-wall sugars and peptidoglycan analyses showed that they were typical of members of Tsukamurella. 16S rRNA gene sequence analysis revealed 100 % sequence identity between HKU52T and HKU53, and the two strains shared 99.5 % sequence identity with Tsukamurella sunchonensis JCM 15929T and Tsukamurella pseudospumae JCM 13375T; HKU51T shared 99.6 % sequence identity with Tsukamurella pulmonis CCUG 35732T. The DNA G+C contents of strains HKU51T, HKU52T and HKU53 were 70.9 ± 2.2, 71.3 ± 2.1 and 71.2 ± 2.3 mol% (mean ± sd; n = 3), respectively. DNA-DNA hybridization confirmed that the novel strains were distinct from other known species of the genus Tsukamurella ( ≤ 50.1 ± 3.7 % DNA-DNA relatedness); two of the isolates, HKU52T and HKU53, represented the same species ( ≥ 94.6 ± 5.6 % DNA-DNA relatedness), while the third isolate, HKU51T, represented another species. The novel species Tsukamurella hongkongensis sp. nov. is proposed to accommodate strains HKU52T and HKU53, with HKU52T ( = JCM 30715T = DSM 100208T) as the type strain; whilst another novel species, Tsukamurella sinensis sp. nov., is proposed to accommodate the third isolate, HKU51T ( = JCM 30714T = DSM 100207T), which is designated the type strain.

  8. Effects of heat treatment on properties of multi-element low alloy wear-resistant steel

    Directory of Open Access Journals (Sweden)

    SONG Xu-ding

    2007-02-01

    Full Text Available The paper has studied the mechanical properties and heat treatment effects on multi-element low alloy wear-resistant steel (MLAWS used as a material for the liner of rolling mill torii. The results show that when quenched at 900-920℃ and tempered at 350-370℃, the MLAWS has achieved hardness above 60 HRC, tensile strength greater than 1 600 MPa, impact toughness higher than 18J/cm2 and fracture toughness greater than 37 MPa

  9. Lactobacillus satsumensis sp. nov., isolated from mashes of shochu, a traditional Japanese distilled spirit made from fermented rice and other starchy materials.

    Science.gov (United States)

    Endo, Akihito; Okada, Sanae

    2005-01-01

    Gram-positive, rod-shaped, motile lactic acid bacteria (strains NRIC 0603, NRIC 0604T, NRIC 0605 and NRIC 0606) were isolated from shochu mashes using an enrichment culture approach. These strains clustered in the Lactobacillus casei-Pediococcus group and were closely related to Lactobacillus nagelii and Lactobacillus mali on the basis of 16S rRNA gene sequence similarity. Levels of DNA-DNA relatedness revealed genotypic separation of the four isolates from the above two species. The isolates are therefore considered to represent a novel species, for which the name Lactobacillus satsumensis is proposed. The type strain is NRIC 0604T (=JCM 12392T=DSM 16230T).

  10. Atom-field entanglement in the Jaynes Cummings model without rotating wave approximation

    Institute of Scientific and Technical Information of China (English)

    M. Mirzaee; M. Batavani

    2015-01-01

    In this paper, we present a structure for obtaining the exact eigenfunctions and eigenvalues of the Jaynes–Cummings model (JCM) without the rotating wave approximation (RWA). We study the evolution of the system in the strong coupling region using the time evolution operator without RWA. The entanglement of the system without RWA is investigated using the Von Neumann entropy as an entanglement measure. It is interesting that in the weak coupling regime, the population of the atomic levels and Von Neumann entropy without RWA model shows a good agreement with the RWA whereas in strong coupling domain, the results of these two models are quite different.

  11. Surface and morphological features of laser-irradiated silicon under vacuum, nitrogen and ethanol

    Science.gov (United States)

    Hayat, Asma; Bashir, Shazia; Akram, Mahreen; Mahmood, Khaliq; Iqbal, Muhammad Hassan

    2015-12-01

    Laser-induced surface and structural modification of silicon (Si) has been investigated under three different environments of vacuum, nitrogen (100 Torr) and ethanol. The interaction of 1000 pulses of KrF (λ ≈ 248 nm, τ ≈ 18 ns, repetition rate ≈ 30 Hz) Excimer laser at two different fluences of 2.8 J/cm2 and 4 J/cm2 resulted in formation of various kinds of features such as laser induced periodic surface structures (LIPSS), spikes, columns, cones and cracks. Surface morphology has been observed by Scanning Electron Microscope (SEM). Whereas, structural modification of irradiated targets is explored by Raman spectroscopy. SEM analysis exhibits a non-uniform distribution of micro-scale pillars and spikes at the central ablated regime of silicon irradiated at low laser fluence of 2.8 J/cm2 under vacuum. Whereas cones, pits, cavities and ripples like features are seen at the boundaries. At higher fluence of 4 J/cm2, laser induced periodic structures as well as micro-columns are observed. In the case of ablation in nitrogen environment, melting, splashing, self-organized granular structures and cracks along with redeposition are observed at lower fluence. Such types of small scaled structures in nitrogen are attributed to confinement and shielding effects of nitrogen plasma. Whereas, a crater with multiple ablative layers is formed in the case of ablation at higher fluence. Significantly different surface morphology of Si is observed in the case of ablation in ethanol. It reveals the formation of cavities along with small scale pores and less redeposition. These results reveal that the growth of surface and morphological features of irradiated Si are strongly dependent upon the laser fluence as well as environmental conditions. The difference in surface morphology is attributable to cooling, confinement and shielding effects as well as difference in plasma temperature, density and pressure of environmental media that corresponds to different energy deposition

  12. Study on the Instrument of Hair Removal by YAG Laser%可调脉宽YAG激光脱毛机研究

    Institute of Scientific and Technical Information of China (English)

    李永亮; 张玉兰; 张喜和

    2003-01-01

    介绍了可调脉宽YAG激光脱毛机的工作原理,整机结构和关键技术指标.该机工作频率为1次/秒,脉宽可达40ms,单脉冲输出可达40J,能量密度达140J/cm2,经初步临床实验,取得了较满意的结果.

  13. Effect of pulsed light on structure and immunoreactivity of gluten.

    Science.gov (United States)

    Panozzo, Agnese; Manzocco, Lara; Lippe, Giovanna; Nicoli, Maria Cristina

    2016-03-01

    The effect of pulsed light (from 1.75 to 26.25Jcm(-2)) on selected properties of wheat gluten powder and aqueous suspension (absorbance, particle size and microstructure, free sulfhydryl content, protein fractions, protein electrophoretic mobility and immunoreactivity) was investigated. Gluten photoreactivity was strongly affected by hydration. While minor photo-induced structure modifications were observed in gluten powder, pulsed light induced the development of browning and promoted partial depolymerisation of hydrated gluten proteins by disulphide exchange. These changes were associated with a significant decrease in immunoreactivity, suggesting that pulsed light could be exploited to efficiently modify structure and thus functionality of gluten.

  14. Efecto de las características del puesto de trabajo sobre la satisfacción, el compromiso y el absentismo en organizaciones sanitarias

    OpenAIRE

    Zurriaga, Rosario; Ramos, José; González-Romá, Vicente; Espejo Tort, Begoña; Zornoza, Ana

    2000-01-01

    El presente estudio parte del Modelo de Características del Puesto (JCM, Hackman y Oldham, 1980). En una muestra de 932 trabajadores de diferentes puestos de trabajo del Servicio Valenciano de Salud, se analiza la capacidad predictora de cinco características del puesto de trabajo (variedad, identidad de tareas, significación de tareas, autonomía y feedback del puesto) y del potencial motivador del puesto de trabajo (MPS, calculado a partir del Job Diagnostic Survey) sobre la satisfacción lab...

  15. Coherence Loss of Two-Photon Jaynes-Cummings Model in Dispersive Approximation

    Institute of Scientific and Technical Information of China (English)

    ZHOU Ling; GUO Yan-Qing; SONG He-Shan; LI Chong

    2004-01-01

    Completely solving the dissipative dynamics of nonlinear Jaynes-Cumming model is a very difficult task.In our recent work (Phys. Lett. A284 (2001) 156), we just obtained analytical results of the field dissipative dynamics of the nonlinear JCM. In the present paper, employing the perturbative expansion of master equation, we obtain the density operator of the system (field +atom). The coherence losses of the system and of the atom are investigated when two-photon process is involved. We also study the effect of different atomic initial states and the influence of the field amplitude on the atomic coherence loss.

  16. 激光处理GaN薄膜的研究%The research of laser treatment of GaN thin film

    Institute of Scientific and Technical Information of China (English)

    陶华锋; 杨忠孝; 宁永功; 屠晶景; 徐洪艳

    2005-01-01

    通过激光损伤实验,报道了GaN薄膜10.6μm CO2激光的损伤阈值是64J/cm2;为了改善GaN薄膜质量,对其进行了10.6μm CO2激光辐照处理,结果表明,处理后GaN薄膜的缺陷密度明显降低.并对机理进行了分析.

  17. Effect of Fluoride Varnish Combined with Er:YAG Laser on the Permeability of Eroded Dentin: An In Situ Study

    OpenAIRE

    Nemezio,Mariana Alencar; Carvalho,Sandra Chiga; Scatolin, Renata Siqueira; Colucci,Vivian; Galo, Rodrigo; Corona, Silmara Aparecida Milori

    2015-01-01

    This study evaluated the combined effect of fluoride varnish and Er:YAG laser on the permeability of eroded bovine root dentin. After initial erosive challenge followed by a remineralization period, the specimens were divided in two groups according to the treatment - fluoride varnish and non-fluoride varnish - and were subdivided according to the irradiation protocol: Er:YAG laser (100 mJ, 3 Hz, 12.8 J/cm2per pulse, non-contact and defocus mode) and non-irradiated. After a lead-in period, 7 ...

  18. Učinak pulsirajućeg svjetla velike snage na senzorsku kakvoću plodova mora

    OpenAIRE

    Tomašević, Dr. sc. Igor

    2015-01-01

    Ovo istraživanje predstavlja sistematsko ispitivanje učinka pulsirajućeg svjetla velike snage (engl. Intense Light Pulse, IPL) na senzorsku kakvoću plodova mora. Četiri vrste morskih organizama (tuna, losos, iverak i rakovi) izložili smo utjecaju od 1 do 5 svjetlosnih impulsa (impuls trajanja 300 μs i snage 3,4 J/cm2) s učestalosti od jednog impulsa svake 2 sekunde. Bez obzira na primijenjeni postupak izloženosti pulsirajućem svjetlu velike snage, svi su uzorci morskih organizama ocijenjeni k...

  19. HeNe laser irradiation delivered transcutaneously: its effect on the sciatic nerve of rats.

    Science.gov (United States)

    Nissan, M; Rochkind, S; Razon, N; Bartal, A

    1986-01-01

    For our study of the effect of low energy laser irradiation (LELI) on living tissue we used HeNe laser on rats. The exponential absorption was reaffirmed in the living tissues overlying the sciatic nerve. An optimal range of energy between 3.5 and 7 J--associated with energy concentration of 4-10 J/cm2 delivered transcutaneously--was found to cause a significant increase in action potential in the sciatic nerve. The effect lasted for more than 8 months after the irradiation session.

  20. Endovenous laser therapy for occlusion of incompetent saphenous veins using 1940nm

    Science.gov (United States)

    Sroka, Ronald; Pongratz, Thomas; Esipova, Anna; Dikic, Slobodan; Demhasaj, Sahit; Comsa, Florin; Schmedt, Claus-Georg

    2015-07-01

    Objective: Several studies indicate that ELT using wavelengths of high water absorption showed advantages compared to conventional ELT. Thulium-Lasers emit nearby the local absorption maximum of water at 1940nm. In this clinical study the effectiveness, safety and the feasibility of 1940nm-ELT is proven. Materials and Method: A single centric, prospective observational study was performed. 1940nm-laserenergy was applied using radial emitting fibres with continuous pullback (1mm/s). Treatment was performed under anesthesia (general, spinal, tumescent) thus simultaneous miniphlebectomy and ligation of perforators could be applied. Patient and technical details were systematically collected. Evaluation included: standardized questionnaire, clinical examination, color-duplex ultrasonography preoperatively, 3d, 4w, 6m postoperatively, statistic. Results: The 1940nm-ELT study include 55 patients (female/men=34/21, mean age 55y, range 23-90y) treating n=72 vessels. The mean maximum diameter of great saphenous veins (GSV, n=59) was 7.5mm (range 3.7-11.3mm) and of small saphenous veins (SSV, n=13) was 5.3mm (3.0-10.0mm). The mean applied longitudinal endovenous energy density (LEED) was 64.3J/cm (40.3-98.2J/cm) in GSVs and 51.0J/cm (37.6-72.7J/cm) in SSVs. Complete occlusion of the vein without sign of reflux was achieved in 100%. The mean length of non-occluded stump at the sapheno-femoral junction was 6.0mm (1.0-20.0mm). Postoperative reduction of the diameter of GSV was 1.6mm (21.3%) and 2.0mm (37.7%) in SSV. One (1.4%) endovenous heat induced thrombus (EHIT) was observed. Further adverse events were: paresthesia 10/72 (13.9%), ecchymosis 1/72 (1.4%), lymphocele 1/72 (1.4%), hyperpigmentation 1/72 (1.4%). The mean postoperative pain intensity was 1.3 and 1.8 single doses of analgesics were administered. Normal physical activity was reached after 3d (1-21d). Conclusion: 1940nm-ELT using radial light application effectively eliminates the reflux in insufficient saphenous

  1. Poly(vinylidene fluoride) polymer based nanocomposites with enhanced energy density by filling with polyacrylate elastomers and BaTiO3 nanoparticles

    Science.gov (United States)

    Yu, Ke; Bai, Yuanyuan; Zhou, Yongcun; Niu, Yujuan; Wang, Hong

    2014-02-01

    Polyacrylate elastomers were introduced into poly(vinylidene fluoride) polymer-based nanocomposites filled with BaTiO3 nanoparticles and the three-phase nanocomposite films were prepared. The energy discharged of the nanocomposite with 3 vol. % polyacrylate elastomers is 8.8 J/cm3, approximately 11% higher compared to that of the nanocomposite without adding polyacrylate elastomers. Large elastic deformation of the polyacrylate elastomers increases Maxwell-Wagner-Sillars interfacial polarization and space charge polarization of the nanocomposites with the electric field increasing, which results in increased maximum polarization and energy discharged of the nanocomposites.

  2. MULTIPLE-COURSE PHOTODYNAMIC THERAPY FOR VERRUCOUS LEUKOPLAKIA OF MUCOUS MEMBRANE OF BODY OF THE TONGUE (CASE REPORT

    Directory of Open Access Journals (Sweden)

    Yu. P. Istomin

    2016-01-01

    Full Text Available The results of treatment of the patient with verrucous luekoplakia of mucous membrane of body of the tongue with photodynamic therapy are represented. In 2015 the patient underwent 4 courses of photodynamic therapy with photosensitizer photolon. Photolon was injected at dose of 2 mg/kg 3 h before irradiation (laser output power was 0.262 W, light dose – 50 and 100 J/cm2. The result of treatment was assessed as complete regression: 4 months after multiple-course photodynamic therapy there were no clinical and histological signs of luekoplakia.

  3. Green synthesis of selenium nanoparticles by excimer pulsed laser ablation in water

    Directory of Open Access Journals (Sweden)

    O. Van Overschelde

    2013-10-01

    Full Text Available Pure selenium nanoparticles were successfully synthesized by Liquid Phase - Pulsed Laser Ablation (LP-PLA in de-ionized water. Excimer laser (248 nm operating at low fluence (F ∼ 1 J/cm2 was used to generate colloidal solutions of selenium nanoparticles. The obtained selenium nanoparticles were characterized by UV-visible spectroscopy, Raman spectroscopy, Dynamic Light Scattering, and Transmission Electron Microscopy. We describe the multi-modal size distributions generated and use the centrifugation method to isolate the smallest nanoparticles (∼60 nm in diameter.

  4. Entropy squeezing and atomic inversion in the k-photon Jaynes—Cummings model in the presence of the Stark shift and a Kerr medium: A full nonlinear approach

    Science.gov (United States)

    H, R. Baghshahi; M, K. Tavassoly; A, Behjat

    2014-07-01

    The interaction between a two-level atom and a single-mode field in the k-photon Jaynes—Cummings model (JCM) in the presence of the Stark shift and a Kerr medium is studied. All terms in the Hamiltonian, such as the single-mode field, its interaction with the atom, the contribution of the Stark shift and the Kerr medium effects are considered to be f-deformed. In particular, the effect of the initial state of the radiation field on the dynamical evolution of some physical properties such as atomic inversion and entropy squeezing are investigated by considering different initial field states (coherent, squeezed and thermal states).

  5. The Joint Calibration Model in probabilistic weather forecasting: some preliminary issues

    Directory of Open Access Journals (Sweden)

    Patrizia Agati

    2013-05-01

    Full Text Available Ensemble Prediction Systems play today a fundamental role in weather forecasting. They can represent and measure uncertainty, thereby allowing distributional forecasting as well as deterministic-style forecasts. In this context, we show how the Joint Calibration Model (Agati et al., 2007 – based on a modelization of the Probability Integral Transform distribution – can provide a solution to the problem of information combining in probabilistic forecasting of continuous variables. A case study is presented, where the potentialities of the method are explored and the accuracy of deterministic-style forecasts from JCM is compared with that from Bayesian Model Averaging (Raftery et al., 2005.

  6. The role of sensitivity of ALA (PpIX)-based PDT on Human embryonic kidney cell line (HEK293T)

    Science.gov (United States)

    Fakhar-e-Alam, M.; Atif, M.; Rehman, T.; Sadia, H.; Firdous, S.

    2011-08-01

    Present study evaluates the effects of photodynamic therapy (PDT) with aminolevulinic acid (5-ALA) as photo sensitizer using Human embryonic kidney (HEK293T) cell line as an experimental model. Porphyrins derivatives are used as active cytotoxic antitumor agents in PDT. Above mentioned cell line were irradiated with red light (a diode laser, λ = 635 nm) at different doses (0-160 J/cm2) of light. The influence/effectiveness of incubation time, various concentrations of aminolevulinic acid (5-ALA) and light doses on the cellular viability was studied. HEK293T cells were deliberated by exposing the ALA-PpIX (0-1000 μg/ml) of concentrations. The optimal uptakes of photosensitizer (PS) in cell lines were investigated by means of spectro photo metric measurements. Cells viability was determined by means of neutral red assay (NRA). It was observed that alone, neither photosensitizer nor light dose have significant effect on cells viability, but optimal concentration of PS along with suitable dose of light exhibit effective impact on the viability of cell. Our results showed that light doses of 40 J/cm2 demonstrates effective PDT outcome for HEK293T cell line when incubated with 400 μg/ml, with wrapping up view that HEK293T cell line is very sensitive to ALA-mediated PDT as compared to cell line published in our data. At the end results has been verified by using reactive oxygen species (ROS) measure test.

  7. The improvement of laser induced damage resistance of optical workpiece surface by hydrodynamic effect polishing

    Science.gov (United States)

    Peng, Wenqiang; Guan, Chaoliang; Li, Shengyi; Wang, Zhuo

    2016-10-01

    Surface and subsurface damage in optical element will greatly decrease the laser induced damage threshold (LIDT) in the intense laser optical system. Processing damage on the workpiece surface can be inevitably caused when the material is removed in brittle or plastic mode. As a non-contact polishing technology, hydrodynamic effect polishing (HEP) shows very good performance on generating an ultra-smooth surface without damage. The material is removed by chemisorption between nanoparticle and workpiece surface in the elastic mode in HEP. The subsurface damage and surface scratches can be effectively removed after the polishing process. Meanwhile ultra-smooth surface with atomic level surface roughness can be achieved. To investigate the improvement of LIDT of optical workpiece, polishing experiment was conducted on a magnetorheological finishing (MRF) silica glass sample. AFM measurement results show that all the MRF directional plastic marks have been removed clearly and the root-mean-square (rms) surface roughness has decreased from 0.673nm to 0.177nm after HEP process. Laser induced damage experiment was conducted with laser pulse of 1064nm wavelength and 10ns time width. Compared with the original state, the LEDT of the silica glass sample polished by HEP has increased from 29.78J/cm2 to 45.47J/cm2. It demonstrates that LIDT of optical element treated by HEP can be greatly improved for ultra low surface roughness and nearly defect-free surface/subsurface.

  8. Polymeric Nanoparticle-Based Photodynamic Therapy for Chronic Periodontitis in Vivo

    Directory of Open Access Journals (Sweden)

    Laura Marise de Freitas

    2016-05-01

    Full Text Available Antimicrobial photodynamic therapy (aPDT is increasingly being explored for treatment of periodontitis. Here, we investigated the effect of aPDT on human dental plaque bacteria in suspensions and biofilms in vitro using methylene blue (MB-loaded poly(lactic-co-glycolic (PLGA nanoparticles (MB-NP and red light at 660 nm. The effect of MB-NP-based aPDT was also evaluated in a clinical pilot study with 10 adult human subjects with chronic periodontitis. Dental plaque samples from human subjects were exposed to aPDT—in planktonic and biofilm phases—with MB or MB-NP (25 µg/mL at 20 J/cm2 in vitro. Patients were treated either with ultrasonic scaling and scaling and root planing (US + SRP or ultrasonic scaling + SRP + aPDT with MB-NP (25 µg/mL and 20 J/cm2 in a split-mouth design. In biofilms, MB-NP eliminated approximately 25% more bacteria than free MB. The clinical study demonstrated the safety of aPDT. Both groups showed similar improvements of clinical parameters one month following treatments. However, at three months ultrasonic SRP + aPDT showed a greater effect (28.82% on gingival bleeding index (GBI compared to ultrasonic SRP. The utilization of PLGA nanoparticles encapsulated with MB may be a promising adjunct in antimicrobial periodontal treatment.

  9. Research Update: Enhanced energy storage density and energy efficiency of epitaxial Pb0.9La0.1(Zr0.52Ti0.48O3 relaxor-ferroelectric thin-films deposited on silicon by pulsed laser deposition

    Directory of Open Access Journals (Sweden)

    Minh D. Nguyen

    2016-08-01

    Full Text Available Pb0.9La0.1(Zr0.52Ti0.48O3 (PLZT relaxor-ferroelectric thin films were grown on SrRuO3/SrTiO3/Si substrates by pulsed laser deposition. A large recoverable storage density (Ureco of 13.7 J/cm3 together with a high energy efficiency (η of 88.2% under an applied electric field of 1000 kV/cm and at 1 kHz frequency was obtained in 300-nm-thick epitaxial PLZT thin films. These high values are due to the slim and asymmetric hysteresis loop when compared to the values in the reference undoped epitaxial lead zirconate titanate Pb(Zr0.52Ti0.48O3 ferroelectric thin films (Ureco = 9.2 J/cm3 and η = 56.4% which have a high remanent polarization and a small shift in the hysteresis loop, under the same electric field.

  10. A linear atomic quantum coupler

    Energy Technology Data Exchange (ETDEWEB)

    El-Orany, Faisal A A [Department of Mathematics and computer Science, Faculty of Science, Suez Canal University 41522, Ismailia (Egypt); Wahiddin, M R B, E-mail: el_orany@hotmail.co, E-mail: faisal.orany@mimos.m, E-mail: mridza@mimos.m [Cyberspace Security Laboratory, MIMOS Berhad, Technology Park Malaysia, 57000 Kuala Lumpur (Malaysia)

    2010-04-28

    In this paper we develop the notion of the linear atomic quantum coupler. This device consists of two modes propagating into two waveguides, each of which includes a localized atom. These waveguides are placed close enough to allow exchange of energy between them via evanescent waves. Each mode interacts with the atom in the same waveguide in the standard way as the Jaynes-Cummings model (JCM) and with the atom-mode system in the second waveguide via the evanescent wave. We present the Hamiltonian for this system and deduce its wavefunction. We investigate the atomic inversions and the second-order correlation function. In contrast to the conventional coupler the atomic quantum coupler is able to generate nonclassical effects. The atomic inversions can exhibit a long revival-collapse phenomenon as well as subsidiary revivals based on the competition among the switching mechanisms in the system. Finally, under certain conditions the system can yield the results of the two-mode JCM.

  11. Rationally designed polyimides for high-energy density capacitor applications.

    Science.gov (United States)

    Ma, Rui; Baldwin, Aaron F; Wang, Chenchen; Offenbach, Ido; Cakmak, Mukerrem; Ramprasad, Rampi; Sotzing, Gregory A

    2014-07-01

    Development of new dielectric materials is of great importance for a wide range of applications for modern electronics and electrical power systems. The state-of-the-art polymer dielectric is a biaxially oriented polypropylene (BOPP) film having a maximal energy density of 5 J/cm(3) and a high breakdown field of 700 MV/m, but with a limited dielectric constant (∼2.2) and a reduced breakdown strength above 85 °C. Great effort has been put into exploring other materials to fulfill the demand of continuous miniaturization and improved functionality. In this work, a series of polyimides were investigated as potential polymer materials for this application. Polyimide with high dielectric constants of up to 7.8 that exhibits low dissipation factors (<1%) and high energy density around 15 J/cm(3), which is 3 times that of BOPP, was prepared. Our syntheses were guided by high-throughput density functional theory calculations for rational design in terms of a high dielectric constant and band gap. Correlations of experimental and theoretical results through judicious variations of polyimide structures allowed for a clear demonstration of the relationship between chemical functionalities and dielectric properties.

  12. Ultraviolet reduction of erythromycin and tetracycline resistant heterotrophic bacteria and their resistance genes in municipal wastewater.

    Science.gov (United States)

    Guo, Mei-Ting; Yuan, Qing-Bin; Yang, Jian

    2013-11-01

    Antibiotic resistance in wastewater is becoming a major public health concern, but poorly understood about impact of disinfection on antibiotic resistant bacteria and antibiotic resistance genes. The UV disinfection of antibiotic resistant heterotrophic bacteria and their relevant genes in the wastewater of a municipal wastewater treatment plant has been evaluated. Two commonly used antibiotics, erythromycin and tetracycline were selected because of their wide occurrences in regard to the antibiotic resistance problem. After UV treatment at a fluence of 5mJcm(-2), the log reductions of heterotrophic bacteria resistant to erythromycin and tetracycline in the wastewater were found to be 1.4±0.1 and 1.1±0.1, respectively. The proportion of tetracycline-resistant bacteria (5%) was nearly double of that before UV disinfection (3%). Tetracycline-resistant bacteria exhibited more tolerance to UV irradiation compared to the erythromycin-resistant bacteria (pUV treatment at a fluence of 5mJcm(-2) removed the total erythromycin- and tetracycline-resistance genes by 3.0±0.1 log and 1.9±0.1 log, respectively. UV treatment was effective in reducing antibiotic resistance in the wastewater.

  13. Distribution and evolution of nitrogen fixation genes in the phylum Bacteroidetes.

    Science.gov (United States)

    Inoue, Jun-ichi; Oshima, Kenshiro; Suda, Wataru; Sakamoto, Mitsuo; Iino, Takao; Noda, Satoko; Hongoh, Yuichi; Hattori, Masahira; Ohkuma, Moriya

    2015-01-01

    Diazotrophs had not previously been identified among bacterial species in the phylum Bacteroidetes until the rapid expansion of bacterial genome sequences, which revealed the presence of nitrogen fixation (nif) genes in this phylum. We herein determined the draft genome sequences of Bacteroides graminisolvens JCM 15093(T) and Geofilum rubicundum JCM 15548(T). In addition to these and previously reported 'Candidatus Azobacteroides pseudotrichonymphae' and Paludibacter propionicigenes, an extensive survey of the genome sequences of diverse Bacteroidetes members revealed the presence of a set of nif genes (nifHDKENB) in strains of Dysgonomonas gadei, Dysgonomonas capnocytophagoides, Saccharicrinis fermentans, and Alkaliflexus imshenetskii. These eight species belonged to and were distributed sporadically within the order Bacteroidales. Acetylene reduction activity was detected in the five species examined, strongly suggesting their diazotrophic nature. Phylogenetic analyses showed monophyletic clustering of the six Nif protein sequences in the eight Bacteroidales species, implying that nitrogen fixation is ancestral to Bacteroidales and has been retained in these species, but lost in many other lineages. The identification of nif genes in Bacteroidales facilitates the prediction of the organismal origins of related sequences directly obtained from various environments.

  14. Ablation characteristics of electrospun core-shell nanofiber by femtosecond laser.

    Science.gov (United States)

    Park, ChangKyoo; Xue, Ruipeng; Lannutti, John J; Farson, Dave F

    2016-08-01

    This study examined the femtosecond laser ablation properties of core and shell polymers their relationship to the ablation characteristics of core-shell nanofibers. The single-pulse ablation threshold of bulk polycaprolactone (PCL) was measured to be 2.12J/cm(2) and that of bulk polydimethylsiloxane (PDMS) was 4.07J/cm(2). The incubation coefficients were measured to be 0.82±0.02 for PCL and 0.53±0.03 for PDMS. PDMS-PCL core-shell and pure PCL nanofibers were fabricated by electrospinning. The energy/volume of pure PCL and PDMS-PCL core-shell nanofiber ablation was investigated by measuring linear ablation grooves made at different scanning speeds. At large scanning speed, higher energy/volume was required for machining PDMS-PCL nanofiber than for PCL nanofiber. However, at small scanning speed, comparable energy/volume was measured for PDMS-PCL and PCL nanofiber ablation. Additionally, in linear scanned ablation of PDMS-PCL fibers at small laser pulse energy and large scanning speed, there were partially ablated fibers where the shell was ablated but the core remained. This was attributed to the lower ablation threshold of the shell material.

  15. Femtosecond laser ablation of enamel

    Science.gov (United States)

    Le, Quang-Tri; Bertrand, Caroline; Vilar, Rui

    2016-06-01

    The surface topographical, compositional, and structural modifications induced in human enamel by femtosecond laser ablation is studied. The laser treatments were performed using a Yb:KYW chirped-pulse-regenerative amplification laser system (560 fs and 1030 nm) and fluences up to 14 J/cm2. The ablation surfaces were studied by scanning electron microscopy, grazing incidence x-ray diffraction, and micro-Raman spectroscopy. Regardless of the fluence, the ablation surfaces were covered by a layer of resolidified material, indicating that ablation is accompanied by melting of hydroxyapatite. This layer presented pores and exploded gas bubbles, created by the release of gaseous decomposition products of hydroxyapatite (CO2 and H2O) within the liquid phase. In the specimen treated with 1-kHz repetition frequency and 14 J/cm2, thickness of the resolidified material is in the range of 300 to 900 nm. The micro-Raman analysis revealed that the resolidified material contains amorphous calcium phosphate, while grazing incidence x-ray diffraction analysis allowed detecting traces of a calcium phosphate other than hydroxyapatite, probably β-tricalcium phosphate Ca3), at the surface of this specimen. The present results show that the ablation of enamel involves melting of enamel's hydroxyapatite, but the thickness of the altered layer is very small and thermal damage of the remaining material is negligible.

  16. The Effect of Low Level Laser Irradiation on Human Embryonic Stem Cells

    Directory of Open Access Journals (Sweden)

    Hossein Baharvand

    2005-01-01

    Full Text Available Introduction: Different effects of low level laser irradiation (LLLI on various cell types have already been demonstrated. However, its effects on embryonic stem cells have not yet been shown. The present study evaluates the morphological and immunocytochemical effects of LLLI on human embryonic stem cell (hESC colonies. Material and Methods: Equal-sized pieces of hESC line (Royan H1 were irradiated with a single dose of 830-nm Ga-Al-As diode laser (3, 5, and 8 jcm-2, 30mW and cultured on mouse embryonic fibroblasts. The morphology of the colonies was evaluated qualitatively by observation under an inverted microscope (grades A, B, C, and D exhibited 0-30%, 30-50%, 50-80%, and 80-100% differentiation, respectively. The stemness area was assessed by expression of surface antigens using anti-Tra-1-60 and anti-Tra-1-81. Results: Our data demonstrated a dose-dependent stimulatory effect of LLLI on hESC differentiation. Two doses of 5 and 8jcm-2 induced statistically significant differentiation (grades C and D. Conclusions: These data showed that LLLI influenced hESC differentiation, which might be used for cell therapy after transplantation

  17. Potential anti-inflammatory effect of low-level laser therapy on the experimental reflux laryngitis: a preliminary study.

    Science.gov (United States)

    Marinho, Renata R; Matos, Renata M; Santos, Jandson S; Ribeiro, Maria A G; Ribeiro, Ronaldo A; Lima, Roberto C P; Albuquerque, Ricardo L C; Thomazzi, Sara M

    2014-01-01

    The most common cause of laryngitis is the laryngopharyngeal reflux disease. The symptoms of laryngitis can be hoarseness, globus, chronic cough, voice fatigue, throat pain, and dysphagia. Low-level laser therapy (LLLT) is beneficial to reduce the pain and inflammatory response without side effects. Therefore, LLLT may be a useful tool for the treatment of laryngitis. This study proposes to analyze the effect of laser therapy in a model of reflux-induced laryngitis. The animals were randomly put into three groups: control--non-intubated; nasogastric intubation--intubated; and nasogastric intubation with laser therapy-intubated treated with 105-J/cm(2) laser irradiation. For the induction of laryngitis, the animals were anesthetized and a nasogastric tube was inserted through the nasopharynx until it reached the stomach, for 1 week. Thereafter, measurement of myeloperoxidase activity and the histopathological procedures were performed. In conclusion, we observed in this study that 105-J/cm(2) infrared laser reduced the influx of neutrophils in rats, and it improved the reparative collagenization of the laryngeal tissues.

  18. Effects of oxide precursors on superconducting properties of polycrystalline SmFeAsO1-xFx

    Science.gov (United States)

    Yuan, F. F.; Ding, Y.; Sun, Y.; Zhuang, J. C.; Zhou, W.; Li, G. Z.; Sumption, M.; Li, X. W.; Shi, Z. X.

    2013-12-01

    A series of polycrystalline SmFeAsO1-xFx samples were synthesized by one-step and two-step method at ambient pressure using different oxide precursors, namely As2O3, Fe2O3 and nano-Fe2O3 powder, as the source of element O. Results of X-ray diffraction and magnetic measurements manifest that starting oxides affected the phase formation and superconducting properties of SmFeAsO1-xFx. As2O3 as oxide precursor contributes to the fast formation of superconducting phase for a short period of sintering time. And samples prepared using As2O3 show higher superconducting transition temperature Tc and more stable fluorine doping level. Compared with Fe2O3, nano-Fe2O3 promotes fluorine doping into the O site. While using Fe2O3 leads to higher level of Fe and SmOF impurities. The critical current density Jcm were derived from magnetic hysteresis loops. Sample prepared using As2O3 shows higher Jcm in low temperature and high magnetic fields.

  19. In Vitro Antimicrobial Photodynamic Therapy Against Trichophyton mentagrophytes Using New Methylene Blue as the Photosensitizer.

    Science.gov (United States)

    López-Chicón, P; Gulías, Ò; Nonell, S; Agut, M

    2016-11-01

    Antimicrobial photodynamic therapy combines the use of a photosensitizing drug with light and oxygen to eradicate pathogens. Trichophyton mentagrophytes is a dermatophytic fungus able to invade the skin and keratinized tissues. We have investigated the use of new methylene blue as the photosensitizing agent for antimicrobial photodynamic therapy to produce the in vitro inactivation of T mentagrophytes. A full factorial design was employed to optimize the parameters for photoinactivation of the dermatophyte. The parameters studied were new methylene blue concentration, contact time between the photosensitizing agent and the fungus prior to light treatment, and the fluence of red light (wavelength, 620-645nm) applied. The minimum concentration of new methylene blue necessary to induce the death of all T. mentagrophytes cells in the initial suspension (approximate concentration, 10(6) colony forming units per milliliter) was 50μM for a fluence of 81J/cm(2) after a contact time of 10minutes with the photosensitizing-agent. Increasing the concentration to 100μM allowed the fluence to be decreased to 9J/cm(2). Comparison of our data with other published data shows that the susceptibility of T. mentagrophytes to antimicrobial photodynamic therapy with new methylene blue is strain-dependent. New methylene blue is a photosensitizing agent that should be considered for the treatment of fungal skin infections caused by this dermatophyte. Copyright © 2016 AEDV. Publicado por Elsevier España, S.L.U. All rights reserved.

  20. Antimicrobial blue light therapy for multidrug-resistant Acinetobacter baumannii infection in a mouse burn model: implications for prophylaxis and treatment of combat-related wound infections.

    Science.gov (United States)

    Zhang, Yunsong; Zhu, Yingbo; Gupta, Asheesh; Huang, Yingying; Murray, Clinton K; Vrahas, Mark S; Sherwood, Margaret E; Baer, David G; Hamblin, Michael R; Dai, Tianhong

    2014-06-15

    In this study, we investigated the utility of antimicrobial blue light therapy for multidrug-resistant Acinetobacter baumannii infection in a mouse burn model. A bioluminescent clinical isolate of multidrug-resistant A. baumannii was obtained. The susceptibility of A. baumannii to blue light (415 nm)-inactivation was compared in vitro to that of human keratinocytes. Repeated cycles of sublethal inactivation of bacterial by blue light were performed to investigate the potential resistance development of A. baumannii to blue light. A mouse model of third degree burn infected with A. baumannii was developed. A single exposure of blue light was initiated 30 minutes after bacterial inoculation to inactivate A. baumannii in mouse burns. It was found that the multidrug-resistant A. baumannii strain was significantly more susceptible than keratinocytes to blue light inactivation. Transmission electron microscopy revealed blue light-induced ultrastructural damage in A. baumannii cells. Fluorescence spectroscopy suggested that endogenous porphyrins exist in A. baumannii cells. Blue light at an exposure of 55.8 J/cm(2) significantly reduced the bacterial burden in mouse burns. No resistance development to blue light inactivation was observed in A. baumannii after 10 cycles of sublethal inactivation of bacteria. No significant DNA damage was detected in mouse skin by means of a skin TUNEL assay after a blue light exposure of 195 J/cm(2).

  1. Polymeric Nanoparticle-Based Photodynamic Therapy for Chronic Periodontitis in Vivo

    Science.gov (United States)

    de Freitas, Laura Marise; Calixto, Giovana Maria Fioramonti; Chorilli, Marlus; Giusti, Juçaíra Stella M.; Bagnato, Vanderlei Salvador; Soukos, Nikolaos S.; Amiji, Mansoor M.; Fontana, Carla Raquel

    2016-01-01

    Antimicrobial photodynamic therapy (aPDT) is increasingly being explored for treatment of periodontitis. Here, we investigated the effect of aPDT on human dental plaque bacteria in suspensions and biofilms in vitro using methylene blue (MB)-loaded poly(lactic-co-glycolic) (PLGA) nanoparticles (MB-NP) and red light at 660 nm. The effect of MB-NP-based aPDT was also evaluated in a clinical pilot study with 10 adult human subjects with chronic periodontitis. Dental plaque samples from human subjects were exposed to aPDT—in planktonic and biofilm phases—with MB or MB-NP (25 µg/mL) at 20 J/cm2 in vitro. Patients were treated either with ultrasonic scaling and scaling and root planing (US + SRP) or ultrasonic scaling + SRP + aPDT with MB-NP (25 µg/mL and 20 J/cm2) in a split-mouth design. In biofilms, MB-NP eliminated approximately 25% more bacteria than free MB. The clinical study demonstrated the safety of aPDT. Both groups showed similar improvements of clinical parameters one month following treatments. However, at three months ultrasonic SRP + aPDT showed a greater effect (28.82%) on gingival bleeding index (GBI) compared to ultrasonic SRP. The utilization of PLGA nanoparticles encapsulated with MB may be a promising adjunct in antimicrobial periodontal treatment. PMID:27213356

  2. Modelling of Indirect Laser-induced Thin-film Ablation of Epoxy for Local Exposing of Carbon Fibers

    Science.gov (United States)

    Emonts, Michael; Fischer, Kai; Schmitt, Stefan; Schares, Richard Ludwig

    Laser radiation is used as enabling technology for intrinsic joining of high-strength CFRP laminates and fiber-reinforced thermoplastic injection moulding compounds by exposure of surface-near carbon fibers. Short-pulsed NIR laser sources represent an acceptable compromise with respect to ablation performance, remote process capability by use of compact 3D scanner and the capability for closed-loop process control. However, using such a laser source means also minimizing heat-affected zones (HAZ). Based on literature research about laser ablation of thin metal films, heat flow at CFRP and thermo-mechanical behavior in FRP by pyrolysis, an analytical model was generated for thin-film ablation of cured epoxy resins at the surface of CFRP laminates by lift-off of resin chips. A comparison between simulation and experimental results confirms the capability of the model to predict the exposure area and the HAZ with deviations below 15%. Threshold fluences for the HAZ (>1 J/cm2) and the resin ablation (>3 J/cm2) have been confirmed.

  3. Analysis of the effective dose of ultraviolet light in corneal cross-linking.

    Science.gov (United States)

    Zhang, Yong; Wang, Kuan-Chen; Chang, Chao-Kai; Lin, Jui-Teng

    2016-01-01

    To analyze the efficacy of ultraviolet (UV) light initiating corneal cross-linking (CXL). The time-dependent absorption of UV light due to the depletion of the initiator (riboflavin) was calculated. The effective dose of CXL with corneal surface covered by a thin layer of riboflavin was derived analytically. The cross linking time was calculated by the depletion level of the riboflavin concentration. A comprehensive method was used to derive analytic formulas. The effective dose of CXL was reduced by a factor (R) which was proportional to the thickness (d) and concentrations (C0) of the riboflavin surface layer. Our calculations showed that the conventional dose of 5.4 J/cm(2) had a reduced effective dose of 4.3 and 3.45 J/cm(2), for d was 100 and 200 µm, respectively, and C0=0.1%. The surface cross linking time was calculated to be T*=10.75s, for a depletion level of 0.135 and UV initial intensity of 30 mW/cm(2). The volume T* was exponentially increasing and proportional to exp (bdC0), with b being the steady state absorption coefficient. The effective dose of CXL is reduced by a factor proportional to the thickness and concentrations of the riboflavin surface layer. The wasted dose should be avoided by washing out the extra riboflavin surface layer prior to the UV light exposure.

  4. Photodynamic therapy combined with distant gamma-ray therapy in the patient with squamous cell carcinoma of the skin

    Directory of Open Access Journals (Sweden)

    V. L. Filinov

    2015-01-01

    Full Text Available Results of clinical follow-up of the patient with squamous cell skin carcinoma of the nasal dorsum are represented. The patient underwent a course of combined photodynamic therapy (PDT with distant gamma-ray therapy. Distant gamma-ray therapy was performed daily during 12 days (single dose of 3 Gy, total dose of 36 Gy with the first session 24 h after injection of the photosensitization. For PDT the photosensitizer photosens at dose of 0,3 mg/kg was used. The method of prolonged PDT was applied, sessions of laser irradiation were performed daily during 7 days. The PDT sessions were carried out 2 h after session of gamma-ray therapy using distant (150 J/cm2, 40 mW/cm2 and contact (500 J/cm2, 100 mW/cm2 modalities. According to multiple cytological studies after treatment there were no signs of tumor, but inflammation. Four months after treatment according to cytological data continued tumor growth was detected. The patient underwent an additional course of PDT. Currently the patient is under follow-up: no recurrence during 8 months after repeated treatment. 

  5. High-Energy-Density Poly(styrene-co-acrylonitrile) Thin Films

    Science.gov (United States)

    Wen, Fei; Xu, Zhuo; Xia, Weimin; Ye, Hongjun; Wei, Xiaoyong; Zhang, Zhicheng

    2013-12-01

    The dielectric response of poly(styrene-co-acrylonitrile) (PSAN) thin films fabricated by a solution casting process was investigated in this work. Linear dielectric behavior was obtained in PSAN films under an electric field at frequencies from 100 Hz to 1 MHz and temperature of -50°C to 100°C. The polymer films exhibited an intermediate dielectric permittivity of 4 and low dielectric loss (tan δ) of 0.027. Under 400 MV/m, the energy density of the PSAN films was 6.8 J/cm3, which is three times higher than that of biaxially oriented polypropylene (BOPP) (about 1.6 J/cm3). However, their charge-discharge efficiency (about 90%) was rather close to that of BOPP. The calculated effective dielectric permittivity of the PSAN films under high electric field was as high as 9, which may be attributed to the improved displacement of the cyanide groups (-CN) polarized at high electric fields. These high-performance features make PSAN attractive for high-energy-density capacitor applications.

  6. Comparative analysis of serial and parallel laser patterning of Ag nanowire thin films

    Science.gov (United States)

    Oh, Harim; Lee, Myeongkyu

    2017-03-01

    Ag nanowire (AgNW) films solution-coated on a glass substrate were laser-patterned in two different ways. For the conventional serial process, a pulsed ultraviolet laser of 30 kHz repetition rate and ∼20 ns pulse width was employed as the laser source. For parallel patterning, the film was directly irradiated by a spatially-modulated Nd:YAG laser beam that has a low repetition rate of 10 kHz and a shorter pulse width of 5 ns. While multiple pulses with energy density ranging from 3 to 9 J/cm2 were required to pattern the film in the serial process, a single pulse with energy density of 0.16 J/cm2 completely removed AgNWs in the parallel patterning. This may be explained by the difference in patterning mechanism. In the parallel process using short pulses of 5 ns width, AgNWs can be removed in their solid state by the laser-induced thermo-elastic force, while they should be evaporated in the serial process utilizing a high-repetition rate laser. Important process parameters such as threshold energy density, speed, and available feature sizes are comparatively discussed for the two patterning

  7. Preclinical investigations of articular cartilage ablation with femtosecond and pulsed infrared lasers as an alternative to microfracture surgery

    Science.gov (United States)

    Su, Erica; Sun, Hui; Juhasz, Tibor; Wong, Brian J. F.

    2014-09-01

    Microfracture surgery is a bone marrow stimulation technique for treating cartilage defects and injuries in the knee. Current methods rely on surgical skill and instrumentation. This study investigates the potential use of laser technology as an alternate means to create the microfracture holes. Lasers investigated in this study include an erbium:YAG laser (λ=2.94 μm), titanium:sapphire femtosecond laser system (λ=1700 nm), and Nd:glass femtosecond laser (λ=1053 nm). Bovine samples were ablated at fluences of 8 to 18 J/cm2 with the erbium:YAG laser, at a power of 300±15 mW with the titanium:sapphire femtosecond system, and at an energy of 3 μJ/pulse with the Nd:glass laser. Samples were digitally photographed and histological sections were taken for analysis. The erbium:YAG laser is capable of fast and efficient ablation; specimen treated with fluences of 12 and 18 J/cm2 experienced significant amounts of bone removal and minimal carbonization with saline hydration. The femtosecond laser systems successfully removed cartilage but not clinically significant amounts of bone. Precise tissue removal was possible but not to substantial depths due to limitations of the systems. With additional studies and development, the use of femtosecond laser systems to ablate bone may be achieved at clinically valuable ablation rates.

  8. Photodynamic inactivation of contaminated blood with Staphylococcus aureus

    Science.gov (United States)

    Corrêa, Thaila Q.; Inada, Natalia M.; Pratavieira, Sebastião.; Blanco, Kate C.; Kurachi, Cristina; Bagnato, Vanderlei S.

    2016-03-01

    The presence of bacteria in the bloodstream can trigger a serious systemic inflammation and lead to sepsis that cause septic shock and death. Studies have shown an increase in the incidence of sepsis over the years and it is mainly due to the increased resistance of microorganisms to antibiotics, since these drugs are still sold and used improperly. The bacterial contamination of blood is also a risk to blood transfusions. Thus, bacteria inactivation in blood is being studied in order to increase the security of the blood supply. The purpose of this study was to decontaminate the blood using the photodynamic inactivation (PDI). Human blood samples in the presence of Photogem® were illuminated at an intensity of 30 mW/cm2, and light doses of 10 and 15 J/cm2. Blood counts were carried out for the quantitative evaluation and blood smears were prepared for qualitative and morphological evaluation by microscopy. The results showed normal viability values for the blood cells analyzed. The light doses showed minimal morphological changes in the membrane of red blood cells, but the irradiation in the presence of the photosensitizer caused hemolysis in red blood cells at the higher concentrations of the photosensitizer. Experiments with Staphylococcus aureus, one of the responsible of sepsis, showed 7 logs10 of photodynamic inactivation with 50 μg/mL and 15 J/cm2 and 1 log10 of this microorganism in a co-culture with blood.

  9. Photosensitization reaction induced hemolysis in a cuvette observed with hemoglobin absorption spectrum of various species

    Science.gov (United States)

    Hamada, Risa; Ogawa, Emiyu; Arai, Tsunenori

    2017-02-01

    To reveal hemolysis phenomena induced by a photosensitization reaction with its environment, we measured absorption spectrum of a blood sample to analyze hemoglobin oxidation and resolved oxygen desorption dynamics. The quartz glass cell with 1 mm optical path length was used as a cuvette. Red blood cell suspension medium of 0.625 hematocrit with 30 μg/ml talaporfin sodium was used as a sample. A red diode laser of 664 nm wavelength was emitted to the cuvette with 120 mW/cm2 in irradiance for 40 J/cm2. Absorption spectra of the sample were obtained before and after the photosensitization reaction by a spectrophotometer. Multiple regression analysis was employed to obtain concentrations of various hemoglobin species from measured absorption spectrum. Comparing to 0 and 40 J/cm2, methemoglobin and deoxygenated hemoglobin concentrations increased 0.19 g/dL and 0.02 g/dL, respectively. Oxygenated hemoglobin concentration decreased 0.17 g/dL. Oxygen environment could also be presented by oxygen pressure calculated from the concentrations of oxygenated hemoglobin and deoxygenated hemoglobin. These obtained hemoglobin concentration changes might indicate hemolysis progress and oxygen environment. We think this simple optical measurement could reveal both the hemolysis and oxygen environment.

  10. Low-level light therapy for zymosan-induced arthritis in rats

    Science.gov (United States)

    Castano, Ana P.; Dai, Tianhong; Demidova-Rice, Tatiana N.; Salomatina, Elena V.; Yaroslavsky, Anna N.; Yaroslavsky, Ilya; Cohen, Richard; Apruzzese, William A.; Smotrich, Michael H.; Hamblin, Michael R.

    2007-02-01

    It has been known for many years that low level laser (or light) therapy (LLLT) can ameliorate the pain, swelling and inflammation associated with various forms of arthritis. Light is absorbed by mitochondrial chromophores leading to an increase in ATP, reactive oxygen species and/or cyclic AMP production and consequent gene transcription via activation of transcription factors. However, despite many reports about the positive effects of LLLT in medicine, its use remains controversial. Our laboratory has developed animal models designed to objectively quantify response to LLLT and compare different light delivery regimens. In the arthritis model we inject zymosan into rat knee joints to induce inflammatory arthritis. We have compared illumination regimens consisting of a high and low fluence (3 J/cm2 and 30 J/cm2), delivered at a high and low irradiance (5 mW/cm2 and 50 mW/cm2) using 810-nm laser light daily for 5 days, with the effect of conventional corticosteroid (dexamethasone) therapy. Results indicated that illumination with 810-nm laser is highly effective (almost as good as dexamethasone) at reducing swelling and that longer illumination time was more important in determining effectiveness than either total fluence delivered or irradiance. Experiments carried out using 810-nm LLLT on excisional wound healing in mice also confirmed the importance of longer illumination times. These data will be of value in designing clinical trials of LLLT.

  11. Yoghurt fermented by Lactobacillus delbrueckii subsp. bulgaricus H+ -ATPase-defective mutants exhibits enhanced viability of Bifidobacterium breve during storage.

    Science.gov (United States)

    Ongol, Martin Patrick; Sawatari, Yuki; Ebina, Yoshiko; Sone, Teruo; Tanaka, Michiko; Tomita, Fusao; Yokota, Atsushi; Asano, Kozo

    2007-05-30

    Persistent acid production by Lactobacillus delbrueckii subsp. bulgaricus during refrigerated storage is a major cause of reduced viability of probiotic strains such as Bifidobacterium breve in yoghurt. It was established that H+ -ATPase-defective mutants of lactic acid bacteria have reduced growth and metabolism in low pH environments. Therefore, the aim of this study was to evaluate inhibition of post-acidification and maintenance of B. breve viability in yoghurt fermented by L. delbrueckii subsp. bulgaricus mutants with reduced membrane-bound H+ -ATPase activity during refrigerated storage. Spontaneous neomycin mutants of L. delbrueckii subsp. bulgaricus that had a significantly (P bulgaricus SBT0164 No. 55-1 (mutant) starter culture had markedly reduced post-acidification and maintained viability (> or = 10(8) CFU/ml) of both Bifidobacteruim breve JCM 1192(T) and Bifidobacteruim breve JCM 7017 during storage at 10 degrees C for 21 days. These results clearly showed that yoghurt fermented by mutants of L. delbrueckii subsp. bulgaricus with reduced membrane-bound H+ -ATPase activity has reduced post-acidification that prolongs viability of B. breve in yoghurt during refrigerated storage.

  12. Central nervous system transplantation benefited by low-level laser irradiation

    Science.gov (United States)

    Rochkind, S.; Lubart, Rachel; Wollman, Yoram; Simantov, Rabi; Nissan, Moshe; Barr-Nea, Lilian

    1990-06-01

    Effect of low-level laser irradiation on the central nervous system transplantation is reported. Ernbryonal brain allografts were transplanted into the brain of 20 adult rats and peripheral nerve graft transplanted into the severely injured spinal cord of 16 dogs. The operated wound of 10 rats and 8 dogs were exposed daily for 21 days to lowpower laser irradiation CW HeNe laser (35 mW, 632.8 run, energy density of 30 J/cm2 at each point for rats and 70 J/cm2 at each point for dogs). This study shows that (i) the low-level laser irradiation prevents extensive glial scar formation (a limiting factor in CNS regeneration) between embryonal transplants and host brain; (ii) Dogs made paraplegic by spinal cord injury were able to walk 3-6 months later. Recovery of these dogs was effected by the implantation of a fragment of autologous sciatic nerve at the site of injury and subsequently exposing the dogs to low-level laser irradiation. The effect of laser irradiation on the embryonal nerve cells grown in tissue culture was also observed. We found that low-level laser irradiation induced intensive migration of neurites outward of the aggregates 15-22 The results of the present study and our previous investigations suggest that low-level laser irradiation is a novel tool for treatment of peripheral and central nervous system injuries.

  13. Bone Repair on Fractures Treated with Osteosynthesis, ir Laser, Bone Graft and Guided Bone Regeneration: Histomorfometric Study

    Science.gov (United States)

    dos Santos Aciole, Jouber Mateus; dos Santos Aciole, Gilberth Tadeu; Soares, Luiz Guilherme Pinheiro; Barbosa, Artur Felipe Santos; Santos, Jean Nunes; Pinheiro, Antonio Luiz Barbosa

    2011-08-01

    The aim of this study was to evaluate, through the analysis of histomorfometric, the repair of complete tibial fracture in rabbits fixed with osteosynthesis, treated or not with infrared laser light (λ780 nm, 50 mW, CW) associated or not to the use of hydroxyapatite and guided bone regeneration (GBR). Surgical fractures were created, under general anesthesia (Ketamina 0,4 ml/Kg IP and Xilazina 0,2 ml/Kg IP), on the dorsum of 15 Oryctolagus rabbits that were divided into 5 groups and maintained on individual cages, at day/night cycle, fed with solid laboratory pelted diet and had water ad libidum. On groups II, III, IV and V the fracture was fixed with wire osteosynthesis. Animals of groups III and V were grafted with hydroxyapatite and GBR technique used. Animals of groups IV and V were irradiated at every other day during two weeks (16 J/cm2, 4×4 J/cm2). Observation time was that of 30 days. After animal death (overdose of general anesthetics) the specimes were routinely processed to wax and underwent histological analysis by light microscopy. The histomorfometric analysis showed an increased bone neoformation, increased collagen deposition, less reabsorption and inflammation when laser was associated to the HATCP. It is concluded that IR laser light was able to accelerate fracture healing and the association with HATCP and GBR resulted on increased deposition of CHA.

  14. Thymol and Thymus Vulgaris L. activity against UVA- and UVB-induced damage in NCTC 2544 cell line.

    Science.gov (United States)

    Calò, Rossella; Visone, Clementina M; Marabini, Laura

    2015-09-01

    Many authors focused on the research of natural compounds in order to protect skin from indirect (UVA) and direct (UVB) ultraviolet radiation side effects. The aim of this study to evaluate the protective effect of a dry extract from T. vulgaris L. and of its major synthetic compound thymol (about 60%), against oxidative and genotoxic UVA- and UVB damage. Experiments were reproduced in a low differentiated keratinocytes cell line (NCTC 2544) Cells were pretreated for 1h, in serum-free medium, with thymol (1μg/mL) or T. vulgaris L. (1.82μg/mL) then exposed to different UVA (8-24J/cm(2)) or UVB doses (0.016-0.72J/cm(2)). Immediately after the UV exposure the intracellular redox status was evaluated by ROS quantification and by LPO. Genotoxic aspects were evaluated 24h after the end of irradiations using the alkaline comet assay, the micronucleus formation assay and the immunostaining of phosphorylated H2AX histone protein (detected 1h after the end of UV exposure). Thymol and T. vulgaris L. extract inhibited ROS generation in UVA and UVB-irradiated cells. On the contrary, MDA formation was reduced only in UVA treated cells. Both agents decreased the DNA damage evaluated by the alkaline comet assay, but not in the micronucleus and H2AX tests probably because of the severity of damage (double strands) detected.

  15. Streptomyces alkalithermotolerans sp. nov., a novel alkaliphilic and thermotolerant actinomycete isolated from a soda lake.

    Science.gov (United States)

    Sultanpuram, Vishnuvardhan Reddy; Mothe, Thirumala; Mohammed, Farooq

    2015-02-01

    An alkaliphilic actinomycete, strain AC3(T), was isolated from Lonar soda lake, in India. Based on 16S rRNA gene sequence analysis it was identified that the strain belongs to the class Actinobacteria and was most closely related to Streptomyces sodiiphilus JCM 13581(T) (96.4 % sequence similarity), Streptomyces leeuwenhoekii DSM 42122(T) (96.1 %), Streptomyces albus NRRL B-2365(T) (96.1 %), Streptomyces panacagri Gsoil 519(T) (96.0 %), Streptomyces fimbriatus NBRC 15411(T) (95.9 %) and other members of the genus Streptomyces (cream substrate and white aerial mycelia on most tested media. The optimum pH for growth was determined to be 9.5-10.0 with no growth at pH 7.0. The DNA G+C content of strain AC3(T) was determined to be 71.2 mol %. The results of the polyphasic analysis allowed a clear differentiation of strain AC3(T) from all other members of the genus Streptomyces. Strain AC3(T) is thus considered to represent a novel member of the genus Streptomyces, for which the name Streptomyces alkalithermotolerans sp. nov. is proposed. The type strain is AC3(T) (=KCTC 29497(T) = JCM 30167(T)).

  16. Trigger effect of infrared femtosecond laser irradiation on neoplasm in experimental cervical cancer

    Science.gov (United States)

    Gening, Tatyana; Voronova, Olga; Zolotovskii, Igor; Sysoliatin, Alexey; Dolgova, Dinara; Abakumova, Tatyana

    2013-02-01

    The present work discusses effect of infrared (IR) femtosecond laser irradiation on neoplasm of white mice with experimental cervical cancer- 5 (CC-5 on the 20th and 30th days after tumor transplantation). Tumor tissue was irradiated by femtosecond erbium doped fiber laser: the wavelength is 1.55 μm, average and peak powers are1,25 mW and 6kW, respectively, irradiation trials n=10. The average energy density (energy dose) on a tissue for two groups of animals was 0,24 J/cm2 and 0,36 J/cm2 for a single trial. Irradiation was followed by biochemical determination of LPO AOS parameters ("Lipid peroxidation-antioxidants" system): malondialdehyde (MDA), activity of superoxide dismutase (SOD), catalase and glutathione-reductase (GR), glutathione-S-transferase (GST). A subsequent morphological study of tumor tissue was performed. Mathematical analysis of data demonstrates a weak dependence of the studied parameters on energy dose. The latter implies the trigger effect of IR femtosecond laser irradiation on redox-dependent processes in neoplasm at experimental cervical cancer.

  17. Ultrashort pulses-driven dynamics of blisters in Au-coated gratings

    Science.gov (United States)

    Huang, Haopeng; Kong, Fanyu; Xia, Zhilin; Jin, Yunxia; Li, Linxin; Wang, Leilei; Chen, Junming; Zhang, Hong; Cui, Yun; Shao, Jianda

    2017-10-01

    Au-coated gratings (ACGs) for chirped pulse compression were irradiated using 800 ± 35 nm multiple laser pulses with duration of 30 fs. The laser-induced damage threshold (LIDT) of Au-coated gratings decreases from 0.35 J/cm2 to 0.10 J/cm2 with the increased pulse shots. The near threshold damage feature of Au-coated gratings at different pulses shows blisters. It is indicated that the gradually increased blister height with increasing multiple pulses on ACGs is caused by the accumulation effect. The damage morphologies combine with simulated results indicate that the damage of the ACGs can be attributed to the pinholes at the base of grating pillars and the separation of gold coating and photoresist gratings caused by the photoresist absorbed the incident laser energy. Therefore, we consider the damage threshold can be enhanced by optimizing coating deposition technology to reduce pinholes density and increase the adhesion between the gold and the photoresist.

  18. Reclassification of Lactobacillus catenaformis (Eggerth 1935) Moore and Holdeman 1970 and Lactobacillus vitulinus Sharpe et al. 1973 as Eggerthia catenaformis gen. nov., comb. nov. and Kandleria vitulina gen. nov., comb. nov., respectively.

    Science.gov (United States)

    Salvetti, Elisa; Felis, Giovanna E; Dellaglio, Franco; Castioni, Anna; Torriani, Sandra; Lawson, Paul A

    2011-10-01

    The development of molecular tools and in particular the use of 16S rRNA gene sequencing has had a profound effect on the taxonomy of many bacterial groups. Gram-positive organisms that encompass the genera Lactobacillus and Clostridium within the Firmicutes are examples of taxa that have undergone major revisions based on phylogenetic information. A consequence of these reorganizations is that a number of organisms are now recognized as being misclassified. Previous studies have demonstrated that Lactobacillus catenaformis and Lactobacillus vitulinus are phylogenetically unrelated to Lactobacillus sensu stricto, being placed within the Clostridia rRNA cluster XVII. Based on the phenotypic, chemotaxonomic and phylogenetic data presented, it is proposed that L. catenaformis and L. vitulinus be reclassified in two new genera, named respectively Eggerthia gen. nov., with the type species Eggerthia catenaformis gen. nov., comb. nov. (type strain DSM 20559(T) = ATCC 25536(T) = CCUG 48174(T) = CIP 104817(T) = JCM 1121(T)) and Kandleria gen. nov., with the type species Kandleria vitulina gen. nov., comb. nov. (type strain LMG 18931(T) = ATCC 27783(T) = CCUG 32236(T) = DSM 20405(T) = JCM 1143(T)).

  19. Molecular analysis of the 16S-23S rDNA internal spacer region (ISR) and truncated tRNA(Ala) gene segments in Campylobacter lari.

    Science.gov (United States)

    Hayashi, K; Tazumi, A; Nakanishi, S; Nakajima, T; Matsubara, K; Ueno, H; Moore, J E; Millar, B C; Matsuda, M

    2012-06-01

    Following PCR amplification and sequencing, nucleotide sequence alignment analyses demonstrated the presence of two kinds of 16S-23S rDNA internal spacer regions (ISRs), namely, long length ISRs of 837-844 base pair (bp) [n = six for urease-negative (UN) Campylobacter lari isolates, UN C. lari JCM2530(T), RM2100, 176, 293, 299 and 448] and short length ISRs of 679-725 bp [n = six for UN C. lari: n = 14 for urease-positive thermophilic Campylobacter (UPTC) isolates]. The analyses also indicated that the short length ISRs mainly lacked the 156 bp sequence from the nucleotide positions 122-277 bp in long length ISRs for UN C. lari JCM2530(T). The 156 bp sequences shared 94.9-96.8 % sequence similarity among six isolates. Surprisingly, atypical tRNA(Ala) gene segment (5' end 35 bp), which was extremely truncated, occurred within the 156 bp sequences in the long length ISRs, as an unexpected tRNA(Ala) pseudogene. An order of the intercistronic tRNA genes within the short nucleotide spacer of 5'-16S rDNA-tRNA(Ala)-tRNA(Ile)-23S rDNA-3' occurred in all the C. lari isolates examined.

  20. Third harmonic separator with high laser-induced damage threshold%高损伤阈值三倍频分离膜

    Institute of Scientific and Technical Information of China (English)

    王孝东; 张锦龙; 马彬; 焦宏飞; 丁涛; 程鑫彬

    2011-01-01

    设计了Nd:YAG激光用三倍频分离膜,膜层材料为SiO2和HfO2.经过优化,膜系在355 nm处的反射率在99%以上,在532 nm和1064 nm处透射率也在99%以上.采用电子束蒸发技术,在熔融石英基底上制备了样品,经测量,制备的分离膜光学性能与设计值接近.分离膜在355 nm激光辐照下的损伤阈值为5.1 J/cm2,并用微分干涉显微镜表征了薄膜损伤形貌.%Using electron beam evaporation, a 355 nm separator was designed by depositiing SiO2 and HfO2 alternatively. The coating has a reflectivity of larger than 99% at 355 nm through optimization and a transmittance larger than 99% at 532 nm and 1 064 nm. It has good electric-field distribution. The spectra of the fabricated coating is close to the designed one. The laser-induced damage threshold of the coating is 5. 1 J/cm2. Morphology of laser-induced damage of the coating was characterized by differential interference contrast microscope.

  1. FTIR spectroscopy structural analysis of the interaction between Lactobacillus kefir S-layers and metal ions

    Science.gov (United States)

    Gerbino, E.; Mobili, P.; Tymczyszyn, E.; Fausto, R.; Gómez-Zavaglia, A.

    2011-02-01

    FTIR spectroscopy was used to structurally characterize the interaction of S-layer proteins extracted from two strains of Lactobacillus kefir (the aggregating CIDCA 8348 and the non-aggregating JCM 5818) with metal ions (Cd +2, Zn +2, Pb +2 and Ni +2). The infrared spectra indicate that the metal/protein interaction occurs mainly through the carboxylate groups of the side chains of Asp and Glut residues, with some contribution of the NH groups belonging to the peptide backbone. The frequency separation between the νCOO - anti-symmetric and symmetric stretching vibrations in the spectra of the S-layers in presence of the metal ions was found to be ca. 190 cm -1 for S-layer CIDCA 8348 and ca. 170 cm -1 for JCM 5818, denoting an unidentate coordination in both cases. Changes in the secondary structures of the S-layers induced by the interaction with the metal ions were also noticed: a general trend to increase the amount of β-sheet structures and to reduce the amount of α-helices was observed. These changes allow the proteins to adjust their structure to the presence of the metal ions at minimum energy expense, and accordingly, these adjustments were found to be more important for the bigger ions.

  2. Effect of pulsed light treatments on the growth and resistance behavior of Listeria monocytogenes 10403S, Listeria innocua, and Escherichia coli ATCC 25922 in a liquid substrate.

    Science.gov (United States)

    Uesugi, Aaron R; Hsu, Lillian; Moraru, Carmen I

    2013-03-01

    Pulsed light (PL) treatment can effectively inactivate a large proportion of contaminating bacteria on surfaces and in clear solutions. An important issue that needs to be investigated is whether repeated exposure to PL treatment causes any changes to the growth and resistance behavior of the bacteria surviving the treatment. To test this, three challenge microorganisms were used: Listeria monocytogenes, Listeria innocua, and Escherichia coli. Cells of the challenge bacteria were treated with either low or high PL doses. Survivors of the PL treatment were enumerated, isolated, regrown, and exposed again to PL treatment. PL inactivation curves were generated for the survivors of each exposure cycle (as well as controls) to examine possible differences induced by repeated treatments. Growth curves of L. monocytogenes, L. innocua, and E. coli isolates recovered from exposure to either 1.1 or 10.1 J/cm(2) were not significantly different from the growth curves of untreated cells. Reduction levels of up to 4 and up to 6 log CFU were obtained after exposure to 1.1 and 10.1 J/cm(2), respectively, both for the controls and the repeatedly treated and recovered isolates. These results show that PL did not significantly change the growth kinetics or resistance to PL of the target microorganisms after up to 10 exposures. These findings have significance for the practical application of PL treatment, as they indicate that this technology does not select for microorganisms with increased resistance.

  3. Low-level laser therapy for the prevention of low salivary flow rate after radiotherapy and chemotherapy in patients with head and neck cancer*

    Science.gov (United States)

    Gonnelli, Fernanda Aurora Stabile; Palma, Luiz Felipe; Giordani, Adelmo José; Deboni, Aline Lima Silva; Dias, Rodrigo Souza; Segreto, Roberto Araújo; Segreto, Helena Regina Comodo

    2016-01-01

    Objective To determine whether low-level laser therapy can prevent salivary hypofunction after radiotherapy and chemotherapy in head and neck cancer patients. Materials and Methods We evaluated 23 head and neck cancer patients, of whom 13 received laser therapy and 10 received clinical care only. An InGaAlP laser was used intra-orally (at 660 nm and 40 mW) at a mean dose of 10.0 J/cm2 and extra-orally (at 780 nm and 15 mW) at a mean dose of 3.7 J/cm2, three times per week, on alternate days. Stimulated and unstimulated sialometry tests were performed before the first radiotherapy and chemotherapy sessions (N0) and at 30 days after the end of treatment (N30). Results At N30, the mean salivary flow rates were significantly higher among the laser therapy patients than among the patients who received clinical care only, in the stimulated and unstimulated sialometry tests (p = 0.0131 and p = 0.0143, respectively). Conclusion Low-level laser therapy, administered concomitantly with radiotherapy and chemotherapy, appears to mitigate treatment-induced salivary hypofunction in patients with head and neck cancer. PMID:27141130

  4. Roseomonas tokyonensis sp. nov. isolated from a biofilm sample obtained from a cooling tower in Tokyo, Japan.

    Science.gov (United States)

    Furuhata, Katsunori; Ishizaki, Naoto; Edagawa, Akiko; Fukuyama, Masafumi

    2013-01-01

    Strain K-20(T), a Gram-negative, nonmotile, nonspore-forming and strictly aerobic coccobacillus, which produces a pale pink pigment (R2A agar medium, 30℃, seven days) was isolated from a sample of biofilm obtained from a cooling tower in Tokyo, Japan. A phylogenetic analysis of the 16S rRNA partial gene sequences (1,439 bp) showed that the strain (accession number: AB297501) was related to Roseomonas frigidaquae CW67(T) and Roseomonas stagni HS-69(T) with 97.4% and 96.9% sequence similarity, respectively. Strain K-20(T) formed a distinct cluster with Roseomonas frigidaquae CW67(T) in the phylogenetic tree at a high bootstrap value (93%); however, distance was recognized between the strains. In addition, the DNA-DNA hybridization level between strain K-20(T) and Roseomonas frigidaquae JCM 15073(T) was 33%. The taxonomic data indicate that K-20(T) (=JCM 14634(T) =KCTC 32152(T)) should be classified in the genus Roseomonas as the type strain of a novel species, Roseomonas tokyonensis sp. nov.

  5. Determination of ablation threshold for composite resins and amalgam irradiated with femtosecond laser pulses

    Science.gov (United States)

    Freitas, A. Z.; Freschi, L. R.; Samad, R. E.; Zezell, D. M.; Gouw-Soares, S. C.; Vieira, N. D., Jr.

    2010-03-01

    The use of laser for caries removal and cavity preparation is already a reality in the dental clinic. The objective of the present study was to consider the viability of ultrashort laser pulses for restorative material selective removal, by determining the ablation threshold fluence for composite resins and amalgam irradiated with femtosecond laser pulses. Lasers pulses centered at 830 nm with 50 fs of duration and 1 kHz of repetition rate, with energies in the range of 300 to 770 μJ were used to irradiate the samples. The samples were irradiated using two different geometrical methods for ablation threshold fluence determinations and the volume ablation was measured by optical coherence tomography. The shape of the ablated surfaces were analyzed by optical microscopy and scanning electron microscopy. The determined ablation threshold fluence is 0.35 J/cm2 for the composite resins Z-100 and Z-350, and 0.25 J/cm2 for the amalgam. These values are half of the value for enamel in this temporal regime. Thermal damages were not observed in the samples. Using the OCT technique (optical coherence tomography) was possible to determine the ablated volume and the total mass removed.

  6. The influence of photodynamic therapy (PDT) with δ-aminolevulinic acid (ALA) on J-774A.1 macrophage cell line

    Science.gov (United States)

    Kawczyk-Krupka, Aleksandra; Czuba, Zenon; Ledwon, Aleksandra; Latos, Wojciech; Sliszka, Ewelina; Mianowska, Marta; Krol, Wojciech; Sieron, Aleksander

    2008-02-01

    Introduction. The whole mechanism of the cellular level of tumor destruction by photodynamic therapy (PDT) is still unknown. Despite necrotic and apoptotic ways of cell death, there is a variety of events leading to and magnifying the inactivation of tumor cells. Material and methods. J-774A.1 were incubated with δ-aminolevulinic acid (ALA) at different concentrations (125, 250, 500, 1000 μM) and then irradiated with VIS (400 - 750 nm) at the dose of 5,10 and 30 J/cm2 delivered from the incoherent light source. The effects of the application of ALA-PDT were evaluated on the basis of cell viability, nitric oxide (NO), tumor necrosis factor α- (TNF-α) and interleukin-1β (IL-1β) produced by the J-774A.1 cells. Results. The cell viability (assessed using MTT test) was comparable with control group at 5,10 and 30 J/cm2. At these doses of energy using different concentrations of ALA we have observed that at the higher energy doses, the greater increase of TNF-α release, lowering of the level of IL-1β production and decrease of NO release were observed. There was also observed the dependence of the secretional activity of the cells on the ALA concentrations. Conclusion. The cell viability and production of cytokines depended on ALA concentrations and energy doses of the light. The higher some cytokines' release after PDT could be an additional factor for the complete eradication of tumor.

  7. Effect of helium-neon and infrared laser irradiation on wound healing in rabbits

    Energy Technology Data Exchange (ETDEWEB)

    Braverman, B.; McCarthy, R.J.; Ivankovich, A.D.; Forde, D.E.; Overfield, M.; Bapna, M.S.

    1989-01-01

    We examined the biostimulating effects of helium-neon laser radiation (HeNe; 632.8 nm), pulsed infrared laser radiation (IR; 904 nm), and the two combined on skin wound healing in New Zealand white rabbits. Seventy-two rabbits received either (1) no exposure, (2) 1.65 J/cm2 HeNe, (3) 8.25 J/cm2 pulsed IR, or (4) both HeNe and IR together to one of two dorsal full-thickness skin wounds, daily, for 21 days. Wound areas were measured photographically at periodic intervals. Tissue samples were analyzed for tensile strength, and histology was done to measure epidermal thickness and cross-sectional collagen area. Significant differences were found in the tensile strength of all laser-treated groups (both the irradiated and nonirradiated lesion) compared to group 1. No differences were found in the rate of wound healing or collagen area. Epidermal growth was greater in the HeNe-lased area compared to unexposed tissue, but the difference was not significant. Thus, laser irradiation at 632.8 nm and 904 nm alone or in combination increased tensile strength during wound healing and may have released tissue factors into the systemic circulation that increased tensile strength on the opposite side as well.

  8. Differential vascular response and relationship to tumor response with photodynamic therapy using WST-09 (TOOKAD)

    Science.gov (United States)

    Garbo, Greta M.; Kik, Peter K.; Harrison, Linda T.; Brun, Pierre H.; Blanc, Dominique; Paulin, Pamela S.; Wieman, Thomas J.; Fingar, Victor H.

    2004-06-01

    Bacteriopheophorbide molecules are second-generation photosensitizers with promise for PHotodynamic Therapy applications due largely to their absorption peaks in the near-Infrared region. Palladium bcteriopheophorbide, also called TOOKAD, has been successfully evaluated in several pre-clinical animal models. In this study the effect on tumor and normal vasculature was evaluated using an intravital vascular model on mouse cremaster muscle implanted with the RIF tumor. For tumor response studies, the same RIF tumor was implanted intradermally on the right flank and regression was evaluated for 42 days or until the tumor reached a 12 mm diameter. A light dose 300 J/cm2 were delivered at 763 nm with power density of 100 mW/cm2. Photosensitizer dose was 4 mg/kg body weight. Mice were treated immediately, 10 minutes, 30 minutes, or 24 hours after injection. Only the higher light dose (300 J/cm2) delivered 10 minutes after injection produced a reproducible and complete vascular and tumor response after PDT in these animals. In the cremaster-tumor model, arterioles and venules partially shutdown as early as 40 minutes after the beginning of treatment, while tumor neovasculature was irreversibly closed within 20 minutes of treatment. Tumor response studies demonstrated that the magnitude of vascular stasis correlates with tumor regression studies. Further studies using this photosensitizer are warranted, given its short clearance time and its near-Infrared activation wavelength.

  9. Pulsed laser deposition of rare earth compounds

    CERN Document Server

    Stone, L A

    2001-01-01

    Magnetostrictive thin films have been deposited using various techniques such as sputtering and evaporation but the use of laser deposition has been limited. This research presents the results from pulsed laser deposition (PLD) of TbFe sub 2 , DyFe sub 2 and Terfenol-D thin films using an infra red Transversely Excited Atmospheric (TEA) CO sub 2 laser at lambda approx 10.6 mu m and an ultra violet Argon-Fluoride (ArF) excimer laser at lambda approx 193 nm. Results have showed that the TEA CO sub 2 laser under the range of conditions studied is not suitable for the production of magnetostrictive films. The problems experienced are a mixture of mostly fracture debris at low fluences (F approx 20 Jcm sup - sup 2) and melt droplets at high fluences (F approx 60 Jcm sup - sup 2). In all cases the destruction of the target is a major problem, with the Terfenol-D targets being the worst affected. Thin films produced were all iron rich. The use of an excimer laser has proved more successful in providing stoichiometri...

  10. Acne treatment by methyl aminolevulinate photodynamic therapy with red light vs. intense pulsed light.

    Science.gov (United States)

    Hong, Jong Soo; Jung, Jae Yoon; Yoon, Ji Young; Suh, Dae Hun

    2013-05-01

    Various methods of photodynamic therapy (PDT) for acne have been introduced. However, comparative studies among them are still needed. We performed this study to compare the effect of methyl aminolevulinate (MAL) PDT for acne between red light and intense pulsed light (IPL). Twenty patients were enrolled in this eight-week, prospective, split-face study. We applied MAL cream over the whole face with a three-hour incubation time. Then patients were irradiated with 22 J/cm(2) of red light on one-half of the face and 8-10 J/cm(2) of IPL on the other half during each treatment session. We performed three treatment sessions at two-week intervals and followed-up patients until four weeks after the last session. Inflammatory and non-inflammatory acne lesions were reduced significantly on both sides. The red light side showed a better response than the IPL side after the first treatment. Serious adverse effects after treatment were not observed. MAL-PDT with red light and IPL are both an effective and safe modality in acne treatment. Red light showed a faster response time than IPL. After multiple sessions, both light sources demonstrated satisfactory results. We suggest that reducing the total dose of red light is desirable when performing MAL-PDT in Asian patients with acne compared with Caucasians.

  11. Effects of photobiostimulation on edema and hemorrhage induced by Bothrops moojeni venom.

    Science.gov (United States)

    Nadur-Andrade, Nikele; Barbosa, Ana Maria; Carlos, Fernando Pereira; Lima, Carlos José; Cogo, José Carlos; Zamuner, Stella Regina

    2012-01-01

    Antivenom (AV) treatment has been ineffective in neutralizing the severe local fast-developing tissue damage following snake-bite envenoming. We studied the effectiveness of low-level laser (LLL) and light-emitting diode (LED) irradiation alone or in combination with AV in reducing local edema formation and hemorrhage induced by Bothrops moojeni venom (BmV) in mice. Edema formation was induced by injection of 1 μg per paw of BmV into the right paw and was evaluated before and at several intervals after BmV intraplantar injection. Hemorrhagic activity was evaluated after intradermal injection of 20 μg of BmV by measuring the diameter of the hemorrhagic area on the inner side of the skin. The site of BmV injection was irradiated by LLL or LED 30 min after BmV inoculation. AV was also administered intravenously 30 min after BmV injection. Irradiation with LLL at a wavelength of 685 nm and a dose of 2.2 J/cm(2) and with a red LED and an infrared LED at wavelengths of 635 nm and 945 nm, respectively, and a dose of 4 J/cm(2) reduced edema formation and hemorrhage induced by BmV (p BmV may be clinically relevant.

  12. In-vivo light dosimetry for HPPH-mediated pleural PDT

    Science.gov (United States)

    Dimofte, Andreea; Zhu, Timothy C.; Finlay, Jarod C.; Cullighan, Melissa; Edmonds, Christine E.; Friedberg, Joseph S.; Cengel, Keith; Hahn, Stephen M.

    2015-01-01

    This study examines the light fluence (rate) delivered to patients undergoing pleural PDT as a function of treatment time, treatment volume and surface area. The accuracy of treatment delivery is analyzed as a function of the calibration accuracies of each isotropic detector and the calibration integrating sphere. The patients studied here are enrolled in a Phase I clinical trial of HPPH-mediated PDT for the treatment of non-small cell lung cancer with pleural effusion. Patients are administered 4mg per kg body weight HPPH 24-48 hours before the surgery. Patients undergoing photodynamic therapy (PDT) are treated with light therapy with a fluence of 15-60 J/cm2 at 661nm. Fluence rate (mW/cm2) and cumulative fluence (J/cm2) is monitored at 7 different sites during the entire light treatment delivery. Isotropic detectors are used for in-vivo light dosimetry. The anisotropy of each isotropic detector was found to be within 15%. The mean fluence rate delivery and treatment time are recorded. A correlation between the treatment time and the treatment volume is established. The result can be used as a clinical guideline for future pleural PDT treatment. PMID:26005243

  13. Environment assisted photoconversion of luminescent surface defects in SiO2 nanoparticles

    Science.gov (United States)

    Spallino, Luisa; Spera, Monia; Vaccaro, Lavinia; Agnello, Simonpietro; Gelardi, Franco M.; Zatsepin, Anatoly F.; Cannas, Marco

    2017-10-01

    Time-resolved photoluminescence investigation on SiO2 nanoparticles was carried out in controlled atmosphere, with the aim to discern the effects induced on the typical blue luminescence band by high power UV Nd:YAG laser photons (4.66 eV) and by some selected molecular species of the air (O2, N2, CO2, H2O). These factors ultimately determine both the brightness and photostability of the emitting defect, so as to limit the unique and attracting potentialities offered by this system in many applicative fields. Here it is highlighted that the effects due to photons and molecules, singularly considered, are not additive, the radiation being more dramatic in reducing the emission efficiency. Moreover, by analyzing the kinetics to convert the defects in a non-luminescent configuration both by the direct (photon-defect) and indirect (photon-molecule-defect) interactions, the threshold bleaching fluence is derived, ranging between 5000 J/cm2 (in a vacuum) and 60 J/cm2 (in air). These results indicate that an outstanding enhancement of the defect photostability is gained by passing from ambient atmosphere to vacuum condition, leading to foresee an immediate and relevant improvement in the field of the single-emitter spectroscopy based on the visible emission of SiO2 nanoparticles.

  14. Fiber Optic Versus Direct Laser Delivery For Endarterectomy Of Experimental Atheromas

    Science.gov (United States)

    Eugene, John; Pollock, Marc E.; McColgan, Stephen J.; Hammer-Wilson, Marie; Berns, Michael W.

    1986-01-01

    Direct laser energy delivery was compared to fiber optic laser energy delivery by the performance of open laser endarterectomy in the rabbit arteriosclerosis model. In Group I, 6 open laser endarterectomies were performed with a hand-held CO2 laser (10.6 pm). In Group II, 6 open laser endarterectomies were performed with an argon ion laser (488 nm and 514.5 nm) with the laser beam directed through a 400 μm quartz fiber optic. Gross and light microscopic examination revealed uneven endarterectomy surfaces and frequent perforations at the end points in Group I. In Group II, the endarterectomy surfaces were even and the end points were fused with a tapered transition. Energy density for Group I was 38 ±5 J/cm2. Energy density for Group II was 110±12 J/cm2. CO2 laser energy was better absorbed by arteriosclerotic rabbit aortas than argon ion laser energy, but it could not be as easily controlled. We conclude that a more precise endarterectomy can be performed with fiber optic delivery of laser energy.

  15. Effect of nonionic surfactant addition on Pyrex glass ablation using water-assisted CO2 laser processing

    Science.gov (United States)

    Chung, C. K.; Liao, M. W.; Lin, S. L.

    2010-04-01

    Pyrex glass etching using laser ablation is an important technology for the microfluid application to lab-on-a-chip devices but suffers from the formation of surface crack. In this article, the addition of nonionic surfactant to water for glass ablation using water-assisted CO2 laser processing (WACLAP) has been investigated to enhance ablation rate and to eliminate conventional surface defects of cracks in air. WACLAP for Pyrex glass ablation can reduce thermal-stress-induced crack with water cooling and hydrophilic nonionic surfactant to water can enhance ablation performance. Compared to pure water, the 15% weight percent Lauramidopropyl Betaine surfactant solutions for WACLAP can enhance ablation rate from 13.6 to 25 μm/pass of Pyrex glass ablation at a linear laser energy density of 2.11 J/cm, i.e., 24 W power, 114 mm/s scanning speed, and obtain through-wafer etching at 3.16 J/cm for 20 passes without cracks on the surface. Effect of surfactant concentration and linear energy density on WACLAP was also examined. The possible mechanism of surfactant-enhanced phenomenon was discussed by the Newton’s law of viscosity of surfactant solution.

  16. In vivo light dosimetry for HPPH-mediated pleural PDT

    Science.gov (United States)

    Dimofte, Andreea; Zhu, Timothy C.; Finlay, Jarod C.; Cullighan, Melissa; Edmonds, Christine E.; Friedberg, Joseph S.; Cengel, Keith; Hahn, Stephen M.

    2010-02-01

    This study examines the light fluence (rate) delivered to patients undergoing pleural PDT as a function of treatment time, treatment volume and surface area. The accuracy of treatment delivery is analyzed as a function of the calibration accuracies of each isotropic detector and the calibration integrating sphere. The patients studied here are enrolled in a Phase I clinical trial of HPPH-mediated PDT for the treatment of non-small cell lung cancer with pleural effusion. Patients are administered 4mg per kg body weight HPPH 24-48 hours before the surgery. Patients undergoing photodynamic therapy (PDT) are treated with light therapy with a fluence of 15-60 J/cm2 at 661nm. Fluence rate (mW/cm2) and cumulative fluence (J/cm2) is monitored at 7 different sites during the entire light treatment delivery. Isotropic detectors are used for in-vivo light dosimetry. The anisotropy of each isotropic detector was found to be within 15%. The mean fluence rate delivery and treatment time are recorded. A correlation between the treatment time and the treatment volume is established. The result can be used as a clinical guideline for future pleural PDT treatment.

  17. Photobiomodulation with 660-nm and 780-nm laser on activated J774 macrophage-like cells: Effect on M1 inflammatory markers.

    Science.gov (United States)

    Fernandes, Kristianne Porta Santos; Souza, Nadhia Helena Costa; Mesquita-Ferrari, Raquel Agnelli; Silva, Daniela de Fatima Teixeira da; Rocha, Lilia Alves; Alves, Agnelo Neves; Sousa, Kaline de Brito; Bussadori, Sandra Kalil; Hamblin, Michael R; Nunes, Fábio Daumas

    2015-12-01

    M1 profile macrophages exert a major influence on initial tissue repair process. Few days after the occurrence of injury, macrophages in the injured region exhibit a M2 profile, attenuate the effects of the M1 population, and stimulate the reconstruction of the damaged tissue. The different effects of macrophages in the healing process suggest that these cells could be the target of therapeutic interventions. Photobiomodulation has been used to accelerate tissue repair, but little is known regarding its effect on macrophages. In the present study, J774 macrophages were activated to simulate the M1 profile and irradiated with two different sets of laser parameters (780 nm, 70 mW, 2.6J/cm(2), 1.5s and 660 nm, 15 mW, 7.5 J/cm(2), 20s). IL-6, TNF-α, iNOS and COX-2 gene and protein expression were analyzed by RT-qPCR and ELISA. Both lasers were able to reduce TNF-α and iNOS expression, and TNF-α and COX-2 production, although the parameters used for 780 nm laser provided an additional decrease. 660 nm laser parameters resulted in an up-regulation of IL-6 expression and production. These findings imply a distinct, time-dependent modulation by the two different sets of laser parameters, suggesting that the best modulation may involve more than one combination of parameters.

  18. Selective removal of composite sealants with near-ultraviolet laser pulses of nanosecond duration.

    Science.gov (United States)

    Louie, Tiffany M; Jones, Robert S; Sarma, Anupama V; Fried, Daniel

    2005-01-01

    It is often necessary to replace pit and fissure sealants and composite restorations. This task is complicated by the necessity for complete removal of the remaining composite to enable suitable adhesion of new composite. Previous studies have shown that 355-nm laser pulses from a frequency-tripled Nd:YAG laser can selectively remove residual composite after orthodontic bracket removal on enamel surfaces. Our objective is to determine if such laser pulses are suitable for selective removal of composite pit and fissure sealants and restorations. Optical coherence tomography is used to acquire optical cross sections of the occlusal topography nondestructively before sealant application, after sealant application, and after sealant removal. Thermocouples are used to monitor the temperature in the pulp chamber during composite removal under clinically relevant ablation rates, i.e., 30 Hz and 30 mJ/pulse. At an irradiation intensity of 1.3 J/cm2, pit and fissure sealants are completely removed without visible damage to the underlying enamel. At intensities above 1.5 J/cm2, incident laser pulses remove the resin layer while at the same time preferentially etching the surface of the enamel. Temperature excursions in the pulp chamber of extracted teeth are limited to less than 5 degrees C if air-cooling is used during the rapid removal (1 to 2 min) of sealants, water-cooling is not necessary. Selective removal of composite restorative materials is possible without damage to the underlying sound tooth structure.

  19. Influence of low intensity laser therapy (AsGa) on the cicatrization process of mechanic tendon injury in wistar rats

    Science.gov (United States)

    Lima, J. G. M.; Oliveira Filho, G. R.; Lima, M. T. B. R. M.; Ferreira, A. S.; Silva, J. G.

    2012-09-01

    The aim of this study was to compare the effect of the low level Laser therapy (AsGa) in the experimental tendon injury. Low level Laser therapy has been used in several studies to observe the regenerative quality and tecidual cicatrization. Forty Wistar rats (male) were divided into 4 groups: control group (C-group); injury group (L-group); treated group with Laser therapy 3 J/cm2 (3J-group); and treated group with Laser therapy 6 J/cm2 (6J-group). Groups L, 3J, and 6J were submitted to a mechanic Achilles tendon injury with a Kocher Forceps for 10 s. The animals were sacrificed after ten days of treatment. Histopathological evaluation using hematoxylin-eosin and Picro-Sirius staining showed a decreased ( p < 0.05) of collagen in L-group (353.12 ± 9.85 μm2/field) compared to C-group (215.13 ± 22.63 μm2/field). Animals treated with Laser showed a significant increase in collagen fibers despite the applied dosage (3J-group: 375.89 ± 26.99 μm2/field; 6J group: 400.34 ± 62.92 μm2/field; p < 0.05). These data suggest that low-level Laser therapy was efficient for the treatment of mechanics Achilles tendon injury in Wistar rats.

  20. Fracture Forces of Dentin after Surface Treatment with High Speed Drill Compared to Er:YAG and Er,Cr:YSGG Laser Irradiation.

    Science.gov (United States)

    Franzen, Rene; Kianimanesh, Nasrin; Marx, Rudolf; Ahmed, Asma; Gutknecht, Norbert

    2016-01-01

    Dental tooth restorative procedures may weaken the structural integrity of the tooth, with the possibility of leading to fracture. In this study we present findings of coronal dentin strength after different techniques of surface modification. The fracture strength of dentin beams after superficial material removal with a fine diamond bur high speed drill hand piece, Er:YAG (2.94 μm, 8 J/cm(2)), and Er,Cr:YSGG (2.78 μm, 7.8 J/cm(2)) laser irradiation slightly above the ablation threshold was measured by a four-point bending apparatus. Untreated dentin beams served as a control. A total of 58 dentin beams were manufactured from sterilized human extracted molars using the coronal part of the available dentin. Mean values of fracture strength were calculated as 82.0 ± 27.3 MPa for the control group (n = 10), 104.5 ± 26.3 MPa for high speed drill treatment (n = 10), 96.1 ± 28.1 MPa for Er,Cr:YSGG laser irradiation (n = 20), and 89.1 ± 36.3 MPa for Er:YAG laser irradiation (n = 18). Independent Student's t-tests showed no significant difference between each two groups (p > 0.05). Within the parameter settings and the limits of the experimental setup used in this study, both lasers systems as well as the high speed drill do not significantly weaken coronal dentin after surface treatment.

  1. Effect of visible and infrared polarized light on the healing process of full-thickness skin wounds: an experimental study.

    Science.gov (United States)

    Iordanou, Panagiota; Lykoudis, Efstathios G; Athanasiou, Athanasios; Koniaris, Efthymios; Papaevangelou, Maria; Fatsea, Theodora; Bellou, Panagiota

    2009-04-01

    Polarized light has already been experimentally and clinically used in an effort to promote wound healing, but the findings have been equivocal. The aim of this study was to evaluate the effect of visible and infrared polarized light of a specific range of wavelength (580-3400 nm) on the secondary healing of full-thickness skin wounds in rats. Forty male Wistar rats were used, divided in two groups of 20 animals each. A standardized open full-thickness skin wound was created on the back of each animal. In the first group the rats were exposed to polarized light (40 mW/cm(2) and 2.4 J/cm(2)) for 7 min on a daily basis (total daily dose = 16.8 J/cm(2)), while the second group acted as controls. Clinical and histological evaluation of wound healing were performed on days 5, 10, 15, and 20 post-wound. The size of the wounds was measured with the use of planimetry, whereas epithelialization, inflammatory response, neovascularization, and collagen formation were histologically assessed. According to our findings, the group exposed to light therapy showed statistically significantly faster epithelialization seen on days 10 and 15 post-wound compared to controls, as well as better quality of the healing process (although not statistically significantly) at all time points. In conclusion, this specific fraction of polarized light seems to have beneficial effects on wound healing, leading to faster epithelialization and qualitatively better wound healing.

  2. Assessment of bone healing on tibial fractures treated with wire osteosynthesis associated or not with infrared laser light and biphasic ceramic bone graft (HATCP) and guided bone regeneration (GBR): Raman spectroscopy study

    Science.gov (United States)

    Bastos de Carvalho, Fabíola; Aciole, Gilberth Tadeu S.; Aciole, Jouber Mateus S.; Silveira, Landulfo, Jr.; Nunes dos Santos, Jean; Pinheiro, Antônio L. B.

    2011-03-01

    The aim of this study was to evaluate, through Raman spectroscopy, the repair of complete tibial fracture in rabbits fixed with wire osteosynthesis - WO, treated or not with infrared laser light (λ 780nm, 50mW, CW) associated or not to the use of HATCP and GBR. Surgical fractures were created under general anesthesia (Ketamine 0.4ml/Kg IP and Xilazine 0.2ml/Kg IP), on the tibia of 15 rabbits that were divided into 5 groups and maintained on individual cages, at day/night cycle, fed with solid laboratory pelted diet and had water ad libidum. On groups II, III, IV and V the fracture was fixed with WO. Animals of groups III and V were grafted with hydroxyapatite + GBR technique. Animals of groups IV and V were irradiated at every other day during two weeks (16J/cm2, 4 x 4J/cm2). Observation time was that of 30 days. After animal death the specimens were kept in liquid nitrogen for further analysis by Raman spectroscopy. Raman spectroscopy showed significant differences between groups (p<0.001). It is concluded that IR laser light was able to accelerate fracture healing and the association with HATCP and GBR resulted on increased deposition of calcium hydroxyapatite.

  3. Comparison of quality of facial scars after single low-level laser therapy and combined low-level with high-level (PDL 595 nm) laser therapy.

    Science.gov (United States)

    Vranova, Jana; Remlova, Eva; Jelinkova, Helena; Rosina, Jozef; Dostalova, Tatjana

    2015-01-01

    The main goal of our study was to compare the quality of resulting facials scar 12 weeks after single and combined laser therapy. Forty-one children from age 1.5 to 5 years with facial scars after injury participated in the study. Thirty-one underwent laser therapy, 14 were treated using single low-level laser therapy (670 nm, fluence 3-5 J/cm(-2) ), and 17 underwent combined high-level laser therapy with non-ablative pulsed dye laser (PDL; 595 nm, spot size 7 mm, delay 0.45 ms or 1.5 ms, fluence 9-11 J/cm(-2) , cryogen spray/delay 20/30 ms) and low-level laser therapy. The control group consisted of 10 untreated children. Before treatment and at week 4, 8, and, 12 the scars were evaluated using the POSAS questionnaire. A statistically significant improvement in scars (between ratings before treatment and 4 weeks after therapy, before treatment and 8 weeks after therapy and before treatment and 12 weeks after therapy) was observed in all parameters in both treatment groups (p < 0.0001). For the HLLT+LLLT group the most significant enhancement in the quality of scars was found for all items and at all evaluations, except pigmentation and pliability. There was no improvement observed in quality of facial scars in the control group.

  4. Measurements of nanoparticle size distribution produced by laser ablation of tungsten and boron-carbide in N 2 ambient

    Science.gov (United States)

    Bereznai, Miklós; Heszler, Péter; Tóth, Zsolt; Wilhelmsson, Ola; Boman, Mats

    2006-04-01

    Nanoparticles (NPs) were produced by ablating tungsten and boron-carbide (B 4C) target materials in atmospheric pressure nitrogen ambient using ArF excimer laser pulses. The size distributions of the NPs formed during the ablation were monitored—within a 7-133 nm size window—by a condensation particle counter connected to a differential mobility analyzer. The laser repetition rate was varied between 1-50 Hz, and the fluence was systematically changed in the range of 0.5-15 J/cm 2, for both materials, allowing a comparative study in an extended laser parameter regime. The multishot ablation threshold ( Φth) of B 4C was determined to be ˜1.9 J/cm 2 for the laser used (ArF excimer, λ = 193 nm). Similarly to earlier studies, it was shown that the size distributions consist of mainly small nanoparticles (<˜20 nm) attributed to a non-thermal ablation mechanism below Φth. An additional broad peak appears (between 20 and 40 nm) above Φth as a consequence of the thermally induced macroscopic ablation. Chemical composition of deposited polydisperse nanoparticles was studied by X-ray photoelectron spectroscopy showing nitrogen incorporation into the boron-carbide.

  5. In situ diagnosis of pulsed UV laser surface ablation of tungsten carbide hardmetal by using laser-induced optical emission spectroscopy

    Science.gov (United States)

    Li, Tiejun; Lou, Qihong; Wei, Yunrong; Huang, Feng; Dong, Jingxing; Liu, Jingru

    2001-12-01

    Surface ablation of cobalt cemented tungsten carbide hardmetal with pulsed UV laser has been in situ diagnosed by using the technique of laser-induced optical emission spectroscopy. The dependence of emission intensity of cobalt lines on number of laser shots was investigated at laser fluence of 2.5 J/cm 2. As a comparison, the reliance of emission intensity of cobalt lines as a function of laser pulse number by using pure cobalt as ablation sample was also studied at the same laser condition. It was found that for surface ablation of tungsten carbide hardmetal at laser fluence of 2.5 J/cm 2, the intensities of cobalt lines fell off dramatically in the first 300 consecutive laser shots and then slowed down to a low stable level with even more shots. For surface ablation of pure cobalt at the same laser condition, the intensities of cobalt lines remained constant more or less even after 500 laser shots and then reduced very slowly with even more shots. It was concluded that selective evaporation of cobalt at this laser fluence should be responsible for the dramatic fall-off of cobalt lines with laser shots accumulation for surface ablation of tungsten carbide hardmetal. In contrast, for surface ablation of pure cobalt, the slow reduction of cobalt lines with pulse number accumulation should be due to the formation of laser-induced crater effect.

  6. Influence of Vacuum Organic Contaminations on Laser-Induced Damage of 1064 nm Anti-Reflective Coatings

    Institute of Scientific and Technical Information of China (English)

    CUI Yun; LIU Shi-Jie; HE Hong-Bo; ZHAO Yuan-An; SHAO Jian-Da; FAN Zheng-Xiu

    2007-01-01

    We investigate the influence of vacuum organic contaminations on laser-induced damage threshold (LIDT) of optical coatings. Anti-reflective (AR) coatings at 1064nm made by Ta2O5/SiO2 are deposited by the ion beam sputtering method. The LIDTs of AR coatings are measured in vacuum and in atmosphere, respectively. It is exhibited that contaminations in vacuum are easily to be absorbed onto optical surface because of lower pressure,and they become origins of damage, resulting in the decrease of LIDT from 24.5 J/cm2 in air to 15.7J/cm2 in vacuum. The LIDT of coatings in vacuum has is slightly changed compared with the value in atmosphere after the organic contaminations are wiped off. These results indicate that organic contaminations are the main reason of the LIDT decrease in vacuum. Additionally, damage morphologies have distinct changes from vacuum to atmosphere because of the differences between the residual stress and thermal decomposability of filmy materials.

  7. Analysis of damage threshold of K9 glass irradiated by 248-nm KrF excimer laser

    Science.gov (United States)

    Wang, Xi; Shao, Jingzhen; Li, Hua; Nie, Jinsong; Fang, Xiaodong

    2016-02-01

    The theoretical model of K9 glass irradiated by a 248-nm KrF excimer laser was established, and a numerical simulation was performed to calculate temperature and thermal stress fields in the K9 glass sample using the finite element method. The laser-induced damage thresholds were defined and calculated, and the effect of repetition frequency and the number of pulses on the damage threshold were also studied. Furthermore, the experiment research was carried out to confirm the numerical simulation. The damage threshold and damage morphology were analyzed by means of a metallurgical microscope and scanning electron microscopy. The simulation and experimental results indicated that the damage mechanism of K9 glass irradiated by a KrF excimer laser was melting damage and stress damage, and the stress damage first appeared inside the K9 glass sample. The tensile stress damage threshold, the compressive stress damage threshold, and the melting damage threshold were 0.64, 0.76, and 1.05 J/cm2, respectively. The damage threshold decreased with increasing repetition frequency and number of laser pulses. The experimental results indicated that the damage threshold of K9 glass was 2.8 J/cm2.

  8. In vivo study of laser irradiation of fractionated drug administration based mechanism for effective photodynamic therapy in rat liver

    Science.gov (United States)

    Khurshid, A.; Firdous, S.; Ahmat, L.; Ferraria, J.; Vollet-Filho, J. D.; Kurachi, C.; Bagneto, V. S.; Nawaz, M.; Ikram, M.; Ahmad, M.

    2011-11-01

    Up-regulation of stress-activated proteins in cancer cells plays a protective role against photodynamic induced apoptosis. Post photodynamic therapy extracted normal rat liver tissue usually shows a fraction of surviving cells, the photodynamic resistant cells, residing in the necrotic region. To treat these photodynamic resistant cells a technique has been proposed based on fractionated drug administration of diluted photosensitizer, keeping the net concentration (5 mg/kg) constant, and subsequently varying drug light interval (DLI). Flourescence measurements were made for the presence of photosensitizer in a tissue. For qualitative analysis both histological and morphological studies were made. Although preliminary aim of this approach was not achieved but there were some interesting observation made i.e. for higher dilution of photosensitizer there was a sharp boundary between necrotic and normal portion of tissue. An increase in the absorption coefficient (α) from 2.7 → 2.9 was observed as photosensitizer was diluted while the corresponding threshold dose (D th) persistently decreases from (0.10 → 0.02) J/cm2 when irradiated with a 635 nm laser fluence of 150 J/cm2.

  9. The observation of effects with Q-switched Nd:YAG laser on 165 cases of naevus fuscocaeruleus zygomaticus%调Q开关Nd:YAG激光治疗165例颧部褐青色痣疗效观察

    Institute of Scientific and Technical Information of China (English)

    牟韵竹; 张正中; 杜华英; 周国富; 谭颖; 李咏; 王曦; 李利

    2010-01-01

    目的:观察调Q开关Nd:YAG激光治疗颧部褐青色痣的临床疗效和安全性.方法:应用Q开关Nd:YAG激光治疗颧部褐青色痣患者165例,选用波长1064nm,能量密度4.5~6.0J/cm2,光斑直径3mm,频率1~10Hz;532nm波长能量密度为1.8~2.2J/cm2,光斑直径3mm,频率1~10Hz,共治疗2~5次,术后3个月复诊判定疗效和不良反应.结果:共治愈45例,平均治疗2.6次,总有效率74.1%.术后发生色素沉着89例,无瘢痕发生.结论:调Q开关Nd:YAG激光治疗颧部褐青色痣疗效好,安全性高,不良反应较轻.

  10. Inhibition of Listeria monocytogenes in cold-smoked salmon by Carnobacterium piscicola CS526 isolated from frozen surimi.

    Science.gov (United States)

    Yamazaki, Koji; Suzuki, Minako; Kawai, Yuji; Inoue, Norio; Montville, Thomas J

    2003-08-01

    Strain CS526 was isolated from frozen surimi and identified as a bacteriocin producer that had strong inhibitory activity against Listeria monocytogenes. Strain CS526 was identified as Carnobacterium piscicola by partial 16S rDNA sequence similarity. The ability of this bacteriocinogenic strain and nonbacteriocinogenic C. piscicola JCM5348 to inhibit the growth of L. monocytogenes was examined in culture broth incubated at 12 degrees C and cold-smoked salmon stored at 4, 12, and 20 degrees C. L. monocytogenes viable counts in the culture broth rapidly declined from 10(6) colony-forming units per ml to less than 10 colony-forming units per ml within 1 day at 12 degrees C in the presence of C. piscicola CS526. At 4 and 12 degrees C, inhibition of L. monocytogenes on salmon depended on the initial inoculum level of C. piscicola CS526. However, C. piscicola CS526 was bactericidal to L. monocytogenes within 21 and 12 days at 4 and 12 degrees C in cold-smoked salmon, respectively, even when the initial inoculum levels were low. C. piscicola CS526 suppressed the maximum cell number of L. monocytogenes by two and three log cycles, even at 20 degrees C. However, C. piscicola JCM5348 did not prevent the growth of the pathogen, except at 4 degrees C. Bacteriocin was detected in the samples coinoculated with C. piscicola CS526. The study shows that C. piscicola CS526 might have potential for biopreservation of refrigerated foods against L. monocytogenes.

  11. Investigation of the skin types, minimal erythema dose and minimal persistent pigment darkening dose among the population of Chongqing%重庆市人群皮肤类型调查及最小红斑量和最小持续黑化量测定

    Institute of Scientific and Technical Information of China (English)

    戚东卫; 吕静; 龚娟; 刘毅

    2014-01-01

    ObjectiveTo investigate the skin phototype and the scope of minimal erythema dose (MED) and minimal persistent pigment darkening dose (MPPD) among the population of Chongqing.MethodsSkin phototype was investigated by questionnaire according to the classification of Fitzpatrick skin type. MED and MPPD of participants were determined by using GS2004/2006 multiband standard sun simulator.ResultsAmong the 200 participants, the percentages of skin typeⅡ,Ⅲ andⅣ were 15.0%, 73.5% and 11.5% respectively, and skin typeⅠ,Ⅴand VI were not found. The means of MED for the skin typeⅡ,Ⅲ andⅣ were (63.21±18.22) mJ/cm2, (70.23±17.01) mJ/cm2 and (78.45±20.11) mJ/cm2 respectively. The means of MPPD for the skin typeⅡ,Ⅲ andⅣ were(12.52±3.41)J/cm2, (10.22±3.09) J/cm2 and (8.43±2.51) J/cm2 respectively. From the skin typeⅡ toⅣ, the value of MED increased gradually, and the value of MPPD decreased gradually. There was statistical difference among the different skin types, nevertheless, no signiifcant differences were found among different age and gender groups (P>0.05).ConclusionAmong the population of Chongqing city that have been investigated, skin typeⅢ was the main type, and the mean values of MED, MPPD for skin typeⅢ were (70.23±17.01)mJ/cm2 and (10.22±3.09)J/cm2. The skin type in Chongqing is similar to in other Chinese cities, however, for the scope of MED and MPPD, there is a discrepancy between Chongqing and other districts.%目的:调查重庆市区人群的皮肤光型(又称日光反应性分型),以及最小红斑量(MED)和最小持续黑化量(MPPD)的范围。方法按照Fitzpatrick分型问卷调查皮肤类型, GS2004/2006多波段日光模拟器测定受试者的MED和MPPD。结果200名受试者的Ⅱ型、Ⅲ型、Ⅳ型皮肤分别占15.0%、73.5%、11.5%,未见Ⅰ、Ⅴ、Ⅵ型皮肤。Ⅱ、Ⅲ、Ⅳ型皮肤MED均值分别为(63.21±18.22) mJ/cm2、(70.23±17.01) mJ/cm2、(78.45±20.11) mJ/cm2, MPPD

  12. Fast femtosecond laser ablation for efficient cutting of sintered alumina substrates

    Science.gov (United States)

    Oosterbeek, Reece N.; Ward, Thomas; Ashforth, Simon; Bodley, Owen; Rodda, Andrew E.; Simpson, M. Cather

    2016-09-01

    Fast, accurate cutting of technical ceramics is a significant technological challenge because of these materials' typical high mechanical strength and thermal resistance. Femtosecond pulsed lasers offer significant promise for meeting this challenge. Femtosecond pulses can machine nearly any material with small kerf and little to no collateral damage to the surrounding material. The main drawback to femtosecond laser machining of ceramics is slow processing speed. In this work we report on the improvement of femtosecond laser cutting of sintered alumina substrates through optimisation of laser processing parameters. The femtosecond laser ablation thresholds for sintered alumina were measured using the diagonal scan method. Incubation effects were found to fit a defect accumulation model, with Fth,1=6.0 J/cm2 (±0.3) and Fth,∞=2.5 J/cm2 (±0.2). The focal length and depth, laser power, number of passes, and material translation speed were optimised for ablation speed and high quality. Optimal conditions of 500 mW power, 100 mm focal length, 2000 μm/s material translation speed, with 14 passes, produced complete cutting of the alumina substrate at an overall processing speed of 143 μm/s - more than 4 times faster than the maximum reported overall processing speed previously achieved by Wang et al. [1]. This process significantly increases processing speeds of alumina substrates, thereby reducing costs, making femtosecond laser machining a more viable option for industrial users.

  13. Evaluation of a long pulsed 1064-nm Nd:YAG laser for improvement in appearance of cellulite.

    Science.gov (United States)

    Truitt, Anne; Elkeeb, Laila; Ortiz, Arisa; Saedi, Nazanin; Echague, Agustina; Kelly, Kristen M

    2012-06-01

    Cellulite is a common, unwanted condition, which is challenging to treat. The objective of this investigation was to evaluate safety and effectiveness of a long-pulsed 1064 Nd:YAG laser as a method for improvement in cellulite appearance and to evaluate parameter selection. Twenty-two female subjects with posterior leg cellulite were randomly assigned to treatment of left or right thigh with higher energy treatment with cryogen spray cooling (CSC) (10-mm spot size; 50 J/cm(2); 50-ms pulse duration and CSC settings of 30-ms duration with a 20-ms delay) or lower energy treatment with no CSC (10 mm; 20 J/cm(2); 50 ms). Subjects received three treatments at 4 weeks intervals. Digital photographs and circumference measurements were taken pre-treatment and up to 6 months post-treatment. Nineteen subjects completed three treatments and 16 subjects completed 6-month follow-up. Circumference measurements pre- and post-treatment were not significantly different. Blinded evaluators noted mild improvement in three of seven subjects in high energy group and moderate improvement in two of nine subjects in low energy group. Multiple passes with a long-pulsed 1064 Nd:YAG achieved mild or moderate improvement in some subjects as rated by blinded evaluators.

  14. Microstructure and properties of Ti–Nb–V–Mo-alloyed high chromium cast iron

    Indian Academy of Sciences (India)

    Youping Ma; Xiulan Li; Yugao Liu; Shuyi Zhou; Xiaoming Dang

    2013-10-01

    The correlations of microstructure, hardness and fracture toughness of high chromium cast iron with the addition of alloys (titanium, vanadium, niobium and molybdenum) were investigated. The results indicated that the as-cast microstructure changed from hypereutectic, eutectic to hypoeutectic with the increase of alloy contents. Mo dissolved in austenite and increased the hardness by solid solution strengthening. TiC and NbC mainly existed in austenite and impeded the austenite dendrite development. V existed in multicomponent systems in forms of V alloy compounds (VCrFe8 and VCr2C2).With the increase of alloy additions, carbides size changed gradually from refinement to coarseness, hardness and impact toughness were increased and then decreased. Compared with the fracture toughness (6 J/cm2) and hardness (50.8HRC) without any alloy addition, the toughness and hardness at 0.60 V–0.60Ti–0.60Nb–0.35Mo (wt%) additions were improved and achieved to 11 J/cm2 and 58.9HRC, respectively. The synergistic roles of Ti, Nb, V and Mo influenced the solidification behaviour of alloy. The refinement of microstructure and improvement of carbides morphologies, size and distribution improved the impact toughness.

  15. Effect of Low-Power Helium-Neon Laser Radiation on the Healing of Deep Second-degree Burns in Rats

    Directory of Open Access Journals (Sweden)

    Bayat M

    2004-01-01

    Full Text Available Introduction: This paper presents the results of a study on the effects of two differentdoses of low-power laser irradiation on healing of deep second degree burns. Material and Methods: 60 rats were randomly allocated to one of four groups. Adeep second-degree burn was inflicted in each rat. In the control group (CG burns remained untreated; in Groups LG1 and LG2 the burns were irradiated with low-power Helium Neon laser with energy densities of 1.2 J/cm2 and 2.4 J/cm2 respectively. In the fourth group (G4 the burns were treated topically with 0.2% nitrofurazone cream. The response to treatments was assessed histologically at 7, 16 and 30 days after burning and microbiologically at Day 15. Results: The number of macrophages and the depth of new epidermis was significantly lessin the laser treated groups compared to control and nitrofuorazone treated groups. Staphylococcus epidermidis was found in the wounds of all rats in the laser treated groups. Conclusion: Irradiation of deep second-degree burn with low-power laser produced no beneficial effects on healing of burns.

  16. [Age-related peculiarities of thymus reaction to the exposure to helium-neon laser and injured muscle alloplasty with the muscle tissue from the animals of the same age].

    Science.gov (United States)

    Bulyakova, N V; Azarova, V S

    2015-01-01

    Histological, cytological and morphometric changes in the thymus of 1 month-old, adult (3-4 months-old) and old (24-30 months-old) rats (24 animals in each group) were studied during muscle regeneration after the alloplasty of the injured area with the muscle tissue from the animal of the same age. Muscles of the donor or recipient were subjected to the course of preliminary irradiation with He-Ne laser (dose: 4.5-5.4 J/cm2 for each extremity; total dose of 9.0-10.8 J/cm2 per animal). It was shown that the exposure of gastrocnemius muscles that were prepared for the operation to He-Ne laser radiation decreased morpho-functional activity of the thymus in young, adult and old recipient rats the before surgery. This was demonstrated by its weaker reaction to the allograft during the early time intervals after surgery. The observed effect was more pronounced with the increasing age of an animal.

  17. Photo-stimulatory effect of low energy helium-neon laser irradiation on excisional diabetic wound healing dynamics in wistar rats

    Directory of Open Access Journals (Sweden)

    Maiya Arun

    2009-01-01

    Full Text Available Background: Generally, the significances of laser photo stimulation are now accepted, but the laser light facilitates wound healing and tissue repair remains poorly understood. Aims: We have examined the hypothesis that the laser photo stimulation can enhance the collagen production in diabetic wounds using the excision wound model in the Wistar rat model. Methods: The circular wounds were created on the dorsum of the back of the animals. The animals were divided into two groups. The study group (N = 24 wound was treated with 632.8 nm He-Ne laser at a dose of 3-9J/cm 2 for 5 days a week until the wounds healed completely. The control group was sham irradiated. Result: A significant increase in the hydroxyproline content and reduction in the wound size were observed in the study group. The pro-healing actions seem to be due to increased collagen deposition as well as better alignment and maturation. Conclusion: The biochemical analysis and clinical observation suggested that 3-6 J/cm 2 laser photo stimulation facilitates the tissue repair process by accelerating collagen production in diabetic wound healing.

  18. LOW-POWER HELIUM-NEON LASER IRRADIATION ENHANCES EXPRESSION OF MYOCARDIAL VEGF OF THE RAT%低能量氦氖激光照射增加大鼠心肌血管内皮生长因子的表达

    Institute of Scientific and Technical Information of China (English)

    张卫光; 夏家骝; 田珑; 张书永

    2003-01-01

    目的探求低能量氦氖激光照射大鼠心前区,对心肌血管内皮生长因子(VEGF)表达的影响. 方法采用RT-PCR和免疫组织化学染色图像分析的方法,实验动物分对照组和激光照射组,每组8只,照射组的照射剂量为60.5J/cm2. 结果 VEGF免疫组织化学染色示照射组心肌微血管内皮细胞的着色较重,其平均光密度值为0.246±0.015,明显高于对照组的0.218±0.012(t=9.05,P<0.05);心肌组织VEGF165的RT-PCR产物表达显示,激光照射组的VEGF165 mRNA表达为对照组的2.79倍. 结论以剂量为60.5J/cm2的He-Ne激光照射大鼠心前区,心肌微血管及心肌组织VEGF的表达明显增强.

  19. Monte Carlo description of gas flow from laser-evaporated silver

    DEFF Research Database (Denmark)

    Ellegaard, Ole; SCHOU, J; Urbassek, H

    1999-01-01

    In the present work, we have studied ablation of a silver metal surface with a Nd:YAG laser (355 nm, 0.8 J/cm(2), 6 ns) on the basis of measured data. We have solved the nonlinear heat conduction equation for the laser heating of the system and calculated the varying surface temperature...... in the initial plume as well as the number of monolayers emitted.In the present work, we have studied ablation of a silver metal surface with a Nd:YAG laser (355 nm, 0.8 J/cm(2), 6 ns) on the basis of measured data. We have solved the nonlinear heat conduction equation for the laser heating of the system...... at times t much greater than tau(laser), and this demonstrates that at these later times, the collisions in the plume efficiently smear out the characteristics of the varying temperature at the surface during ablation. The physical properties of the gas flow are determined by the mean thermal energy...

  20. Fluence dependent electrical conductivity in aluminium thin films grown by infrared pulsed laser deposition

    Science.gov (United States)

    Rebollar, Esther; Martínez-Tong, Daniel E.; Sanz, Mikel; Oujja, Mohamed; Marco, José F.; Ezquerra, Tiberio A.; Castillejo, Marta

    2016-11-01

    We studied the effect of laser fluence on the morphology, composition, structure and electric conductivity of deposits generated by pulsed laser ablation of a metallic aluminium target in vacuum using a Q-switched Nd:YAG laser (1064 nm, 15 ns). Upon irradiation for one hour at a repetition rate of 10 Hz, a smooth layer of several tens of nanometres, as revealed by atomic force microscopy (AFM) was deposited on glass. Surface chemical composition was determined by X-ray photoelectron spectroscopy, and to study the conductivity of deposits both I-V curves and conductive-AFM measurements were performed. Irradiation at fluences around 2.7 J/cm2 resulted in deposition of amorphous aluminium oxide films. Differently, at higher fluences above 7 J/cm2, the films are constituted by metallic aluminium. Optical emission spectroscopy revealed that highly ionized species are more abundant in the ablation plumes generated at higher fluences. The results demonstrate the possibility to control by PLD the metal or dielectric character of the films.

  1. Laser ablation of a platinum target in water. III. Laser-induced reactions

    Science.gov (United States)

    Nichols, William T.; Sasaki, Takeshi; Koshizaki, Naoto

    2006-12-01

    This is the third paper in our series studying the laser-target-liquid interactions occurring in laser ablation in liquids (LAL). Here, laser ablation of a platinum target in pure water at 355nm wavelength is studied as a function of laser energy. We describe three distinct reaction regimes between the ablated target species and water at different laser focusing conditions. At low laser fluence (removal is caused by laser heating of the platinum surface and the primary products are small clusters with a large percentage of platinum atoms in a nonzero oxidation state. At intermediate fluences (10-70J/cm2), platinum nanoparticles are the primary products. Our previous studies demonstrated that in this fluence regime ablation occurs through both thermal vaporization and explosive ejection of molten droplets. In both cases reactivity is small due to the low reactivity of platinum with water. At high fluences (>70J/cm2), we find large, faceted particles that are attributed to the drying of PtOx gels formed by reactive plasma etching of the target. Taken together these results demonstrate that significant tunability in the target-liquid interaction is possible during nanomaterial synthesis by LAL.

  2. Inhibition of germ tube's formation of Candida albicans by lactobacillus spp.

    Institute of Scientific and Technical Information of China (English)

    TANG Huan; WEI Hong

    2006-01-01

    Objective:To investigate the effects of 6 strains of lactobacilli and their main culture metabolites on the morphogenesis of Candida albicans (C. albicans) so as to screen medicinal strains as antifungal agents. Methods: Spent culture supernatant (SCS) at different culture time points, live lactobacilli, heatkilled bacteria and bacterial short-chain fatty acids (SCFA) with different molarities were incubated with C. albicans respectively. Crystal violet-based germ tube assay was used to detect the germination of C. albicans and the inhibitory efficiency of each addition was tested by germination rate. Results: SCS of lactobacillus spp. decreased the germination significantly and live bacteria of L. rhamnosus. GG, L. acidophilus L050103-12 as well as L. johnsonii JCM1022 could partially inhibit the conversion, however, all the heatkilled bacteria failed to control the germ tube formation. In addition, only butyric acid blocked the conversion of yeast to hypha among all the SCFA. Conclusion: The excellent fungistasis activities make L.rhamnosus. GG, L. acidophilus L050103-12 and L. johnsonii JCM1022 potential strains as antifungal drugs and the inhibition seems to have direct correlation to the metabolites.

  3. Low-level laser therapy for the prevention of low salivary flow rate after radiotherapy and chemotherapy in patients with head and neck cancer

    Directory of Open Access Journals (Sweden)

    Fernanda Aurora Stabile Gonnelli

    2016-04-01

    Full Text Available Abstract Objective: To determine whether low-level laser therapy can prevent salivary hypofunction after radiotherapy and chemotherapy in head and neck cancer patients. Materials and Methods: We evaluated 23 head and neck cancer patients, of whom 13 received laser therapy and 10 received clinical care only. An InGaAlP laser was used intra-orally (at 660 nm and 40 mW at a mean dose of 10.0 J/cm2 and extra-orally (at 780 nm and 15 mW at a mean dose of 3.7 J/cm2, three times per week, on alternate days. Stimulated and unstimulated sialometry tests were performed before the first radiotherapy and chemotherapy sessions (N0 and at 30 days after the end of treatment (N30. Results: At N30, the mean salivary flow rates were significantly higher among the laser therapy patients than among the patients who received clinical care only, in the stimulated and unstimulated sialometry tests (p = 0.0131 and p = 0.0143, respectively. Conclusion: Low-level laser therapy, administered concomitantly with radiotherapy and chemotherapy, appears to mitigate treatment-induced salivary hypofunction in patients with head and neck cancer.

  4. Photodynamic activity of tetraazachlorin derivate studied in vivo

    Directory of Open Access Journals (Sweden)

    V. I. Ivanova-Radkevich

    2013-01-01

    Full Text Available The results of investigation for photodynamic activity of new tetraazachlorin derivate – tetramethyltribenzotetraazachlorin, synthesized in Research Institute of Organic Intermediates and Dyes. The study was performed on female mice of СВА line. The tumor model was transferred solid ascetic sarcoma S-37. The samples of photosensitizer, previously solubilized in 10% aqueou s solution ofCremophor EL, injected to mice intravenously on the 7th day of tumor growth in dose of 1–2 mg/kg. Two hours later the irradiation of sensitized tumor using light emitting diode device in a maximal wavelength of 755 nm (light power density – 50 mW/cm2, maximal total light dose – 300 J/cm2 was performed. The efficacy of photodynamic therapy was assessed by growth inhibition rates in the study group comparing with control group. The study showed that photodynamic therapy with investigated sample in dose of 2 mg/kg and light dose of 300 J/cm2 significantly inhibited the tumor growth (inhibition rate of 70–80% within 20 days, indicating prospectivity of subsequent investigations of tetraazachlorin as photosensitizer for photodynamic therapy of malignant tumors. 

  5. Effect of laser phototherapy on recurring herpes labialis prevention: an in vivo study.

    Science.gov (United States)

    de Carvalho, Renata Rodrigues; de Paula Eduardo, Fernanda; Ramalho, Karen Müller; Antunes, José Leopoldo Ferreira; Bezinelli, Letícia Mello; de Magalhães, Marina Helena Cury Gallottini; Pegoretti, Tatiana; de Freitas, Patrícia Moreira; de Paula Eduardo, Carlos

    2010-05-01

    Alternative treatment for recurrent labial infection by herpes simplex virus (HSV) have been considered. The aim of this study was to evaluate the effectiveness of laser phototherapy in prevention and reduction of severity of labial manifestations of herpes labialis virus. Seventy-one patients, divided into experimental (n = 41) and control (n = 30) groups were followed up for 16 months. Patients in the control group were treated topically with aciclovir and patients in the experimental group were subjected to laser phototherapy (one session per week, 10 weeks): 780 nm, 60 mW, 3.0 J/cm(2) or 4.5 J/cm(2) on healthy (no HSV-1 infection) and affected (with HSV-1 infection) tissues. Patients in the experimental group presented a significant decrease in dimension of herpes labialis lesions (P = 0.013) and inflammatory edema (P = 0.031). The reduction in pain level (P = 0.051) and monthly recurrences (P = 0.076) did not reach statistical significance. This study represents an in vivo indication that this treatment should be further considered as an effective alternative to therapeutic regimens for herpes labialis lesions.

  6. The effects of photobiomodulation on healing of bone defects in streptozotocin induced diabetic rats

    Science.gov (United States)

    Martinez Costa Lino, Maíra D.; Bastos de Carvalho, Fabíola; Ferreira Moraes, Michel; Augusto Cardoso, José; Pinheiro, Antônio L. B.; Maria Pedreira Ramalho, Luciana

    2011-03-01

    Previous studies have shown positive effects of Low level laser therapy (LLLT) on the repair of bone defects, but there are only a few that associates bone healing in the presence of a metabolic disorder as Diabetes Melitus and LLLT. The aim of this study was to assess histologically the effect of LLLT (AsGaAl), 780nm, 70mW, CW, Ø~0.4mm, 16J/cm2 per session) on the repair of surgical defects created in the femur of diabetic and non-diabetic Wistar Albinus rats. Surgical bone defects were created in 60 animals divided into four groups of 15 animals each: Group C (non-diabetic - control); Group CL (non-diabetic + LLLT); Group CD (diabetic); Group CDL (diabetic + LLLT). The animals on the irradiated group received 16 J/cm2 per session divided into four points around the defect, being the first irradiation immediately after surgery and repeated every 48h for 14 days. The animals were killed 15, 21 and 30 days after surgery. The results of the present investigation showed histological evidence of improved amount of collagen fibers at early stages of the bone healing (15 days) and increased amount of well organized bone trabeculae at the end of the experimental period (30 days) on irradiated animals, (diabetic and non-diabetic) compared to non irradiated ones. It is concluded that LLLT has a positive biomodulative effect on the healing process of bone defects, even when diabetes mellitus was present.

  7. Clinical effect of photodynamic therapy on primary carious dentin after partial caries removal

    Directory of Open Access Journals (Sweden)

    Pierre Adriano Moreno NEVES

    2016-01-01

    Full Text Available Abstract This study was conducted to assess the clinical effect of photodynamic therapy (PDT in the decontamination of the deep dentin of deciduous molars submitted to partial removal of carious tissue. After cavity preparation, dentin samples were taken from the pulp wall of nineteen deciduous molars before and after PDT application. Remaining dentin was treated with 0.01% methylene blue dye followed by irradiation with an InGaAlP diode laser (λ – 660 nm; 40 mW; 120 J/cm2; 120 s. Dentin samples were microbiologically assessed for the enumeration of total microorganisms, Lactobacillus spp. and mutans streptococci. There was no significant difference in the number of colony-forming units (CFU for any of the microorganisms assessed (p > 0.05. Photodynamic therapy, using 0.01% methylene blue dye at a dosimetry of 120 J/cm2 would not be a viable clinical alternative to reduce bacterial contamination in deep dentin.

  8. Series multilayer internal electrodes for high energy density glass-ceramic capacitors

    Institute of Scientific and Technical Information of China (English)

    LUO Jun; DU Jun; TANG Qun; MAO ChangHui

    2009-01-01

    The glass-ceramic dielectrics and internal electrode structures are investigated for improving the general energy storage density of capacitors.Calculation indicates that glass-ceramics acquired from glass matrix annealing at 850℃ for 3 hours can be approximately up to 17 J/cm3 in energy storage density.They are appropriately chosen as the dielectrics for preparing high energy storage density capacitors (HESDCs).A series multilayer structure of internal electrode is developed for the HESDCs,in which each layer is a combination of gold film and silver paste.This electrode structure promises the capacitor immune from the residual porosity defects inevitably brought by electrode paste sintering process,and specifically improves the electrical breakdown strength of the capacitor.Based on this new electrode structure,the energy storage densities of capacitors are increased by more than one order of magnitude compared with those traditional ones with only single layer of internal electrode.Thus,HESDCs based on the optimized glass-ceramic dielectrics can potentially achieve 7.5 J/cm3 in energy storage density,even taking into consideration the enlargement of total capacitor volumes while encapsulating practicable capacitors from dielectrics media.

  9. Diode laser photocoagulation in PHACES syndrome hemangiomas: a case series

    Science.gov (United States)

    Romeo, U.; Russo, N.; Polimeni, A.; Favia, G.; Lacaita, M. G.; Limongelli, L.; Franco, S.

    2014-01-01

    PHACES syndrome is a pediatric syndrome with cutaneous and extra-cutaneous manifestations, such as Posterior fossa defects, Hemangiomas, Arterial lesions, Cardiac abnormalities/aortic coarctation, Eye abnormalities and Sternal cleft. Facial hemangiomas affect the 75% of patients and may arise on the oral mucosa or perioral cutaneous regions. In this study we treated 26 Intraoral Haemangiomas (IH) and 15 Perioral Haemangiomas (PH) with diode laser photocoagulation using a laser of 800+/-10nm of wavelength. For IH treatment an optical fiber of 320 μm was used, and the laser power was set ted at 4 W (t-on 200 ms / t-off 400ms; fluence: 995 J/cm2). For PH treatment an optical fiber of 400 μm at the power of 5 W was used (t-on 100 ms / t-off 300 ms; fluence: 398 J/cm2). IH healed after one session (31%), the other (69%) after two sessions of Laser therapy. In each session, only a limited area of the PH was treated, obtaining a progressive improvement of the lesion. Diode laser photocoagulation is an effective option of treatment for IH and PH in patients affected by PHACE because of its minimal invasiveness. Moreover laser photocoagulation doesn't have side effects and can be performed repeatedly without cumulative toxicity. Nevertheless, more studies are required to evaluate the effectiveness of the therapy in mid and long time period.

  10. External and intralesional photocoagulation of hemangioma in children with infrared diode laser

    Science.gov (United States)

    Abushkin, Ivan A.; Privalov, Valery A.; Lappa, Alexander V.; Besshtanko, Evgeny L.

    2005-08-01

    Infra-red diode laser with wavelength 1060 nm was used for combined treatment of 163 children aged from 21 days to 13 years with 221 hemangiomas. For interstitial coagulation a power of 1.8-2 W and a power density of 5-90 J/cm3 were used in continuous mode. For distant coagulation pulse mode was applied with pulse/pause duration 30-50/200-250 ms, average power 1.3-2 W, and power density 65-450 J/cm2. 197 (89.1 %) hemangiomas were capillary, 7 (3.2 %) cavernous, and 17 (7.7 %) combined (combination of capillary and cavernous hemangiomas). The area of hemangiomas ranged from 6 mm2 to 48 cm2. For the majority (193, 87.3 %) of hemangiomas one session of photocoagulation was enough to achieve a good cosmetic effect. However, 28 (12.7 %) hemangiomas were treated repeatedly, 11 (5%) of them needed 4-7 sessions. In 8 children with cavernous and combined hemangiomas both distant and interstitial laser coagulation were used. In all, good or excellent results were obtained in 96,3 % of the patients. In 6 (3.7%) patients with extensive combined hematomas the considerable improvement was achieved.

  11. Pulsewidth dependence of laser-induced periodic surface structure formed on yttria-stabilized zirconia polycrystal

    Science.gov (United States)

    Kakehata, Masayuki; Yashiro, Hidehiko; Oyane, Ayako; Ito, Atsuo; Torizuka, Kenji

    2016-03-01

    Three-mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) is a fine engineering ceramic that offers high fracture resistance and flexural strength. Thus, it is often applied in mechanical components and medical implants. The surface roughness can be controlled to improve the device characters in some applications. Ultrashort pulse lasers can form laser-induced periodic surface structures (LIPSS) on 3Y-TZP, which have never been investigated in detail. Therefore, this paper reports the formation and characteristics of LIPSS formed on 3Y-TZP, focusing on the pulsewidth dependence. The LIPSS was formed by a Ti:sapphire chirped-pulse amplification system, which generates 810 nmcentered 80-fs pulses at a 570 Hz repetition rate. The measured ablation threshold peak fluence was ~1.5 J/cm2 and the LIPSS was formed at the peak fluence of 2.7-7.7 J/cm2. For linearly polarized pulses, the lines of the LIPSS were oriented parallel to the polarization direction, and their period was comparable to or larger than the center wavelength of the laser. These characteristics differ from the reported characteristics of LIPSS on metals and dielectrics. The pulsewidth dependence of the ablation and LIPSS was investigated for different pulsewidths and signs of chirp. Under the investigated fluence condition, the LIPSS period increased with increasing pulsewidth for both signs of chirp. Similar pulsewidth dependencies were observed for circularly polarized pulses.

  12. Optical and thermal properties in ultrafast laser surface nanostructuring on biodegradable polymer

    Science.gov (United States)

    Yada, Shuhei; Terakawa, Mitsuhiro

    2015-03-01

    We investigate the effect of optical and thermal properties in laser-induced periodic surface structures (LIPSS) formation on a poly-L-lactic acid (PLLA), a biodegradable polymer. Surface properties of biomaterials are known to be one of the key factors in tissue engineering. Methods to process biomaterial surfaces have been studied widely to enhance cell adhesive and anisotropic properties. LIPSS formation has advantages in a dry processing which is able to process complex-shaped surfaces without using a toxic chemical component. LIPSS, however, was difficult to be formed on PLLA due to its thermal and optical properties compared to other polymers. To obtain new perspectives in effect of these properties above, LIPSS formation dependences on wavelength, pulse duration and repetition rate have been studied. At 800 nm of incident wavelength, high-spatial frequency LIPSS (HSFL) was formed after applying 10000 femtosecond pulses at 1.0 J/cm2 in laser fluence. At 400 nm of the wavelength, HSFL was formed at fluences higher than 0.20 J/cm2 with more than 3000 pulses. Since LIPSS was less formed with lower repetition rate, certain heat accumulation may be required for LIPSS formation. With the pulse duration of 2.0 ps, higher laser fluence as well as number of pulses compared to the case of 120 fs was necessary. This indicates that multiphoton absorption process is essential for LIPSS formation. Study on biodegradation modification was also performed.

  13. Towards optical hyperdoping of binary oxide semiconductors

    Science.gov (United States)

    Schneider, A.; Sebald, K.; Dev, A.; Frank, K.; Rosenauer, A.; Voss, T.

    2013-04-01

    Surface structuring with ultrashort laser pulses is of high interest as a scalable doping technique as well as for surface nanostructuring applications. By depositing a layer of antimony before the irradiation of ZnO, we were able to incorporate a large quantity of Sb atoms into the single crystalline region of the laser modified surface for potential p-type doping. We have studied the incorporation of antimony and the material properties of laser-induced periodic surface structures (LIPSS) on c-plane ZnO upon femtosecond laser processing at two different peak fluences. We observe high spatial frequency LIPSS with structure periods from 200-370 nm and low spatial frequency LIPSS with periods of 600-700 nm. At a fluence of 0.8 J/cm2, close the ablation threshold of ZnO, the LIPSS are single crystalline except for a few nanometers of amorphous material. At a peak laser fluence of 3.1 J/cm2, they consist of polycrystalline and single crystalline ZnO areas. However, the polycrystalline part dominates with a thickness of about 500 nm.

  14. [Effects of low power laser radiation of blue, green and red ranges on free radical processes in rat blood in endotoxic shock].

    Science.gov (United States)

    Machneva, T V; Kosmacheva, N V; Vladimirov, Iu A; Osipov, A N

    2013-01-01

    This study was performed to investigate the effects of low power laser radiation in blue (441.2 nm), green (532.5 nm) and red (632.8 nm) wavelength ranges on free radical processes in experimental endotoxic shock in rats. The experimental model was produced by intraperitoneal injection of lipopolysacharide B (25 mg/kg) (LPS). The following parameters were assayed in the study: the chemiluminescent assay (to evaluate the free radical production by blood leukocytes), nitro blue tetrazolium assay (to monitor the superoxide dismutase activity of plasma) and cis-parinaric acid fluorescence (to estimate the intensity of lipid peroxidation in erythrocyte membranes). It was found that the low power laser radiation significantly influenced all investigated processes, in animals both treated and untreated without LPS injection. The most pronounced effects were observed in all groups of animals subjected to the low power laser radiation: at the dose of 0.75 J/cm2 green laser was most effective and at the dose of 1.5 J/cm2 green and red lasers provided maximal effects. The mechanisms of the observed phenomena are discussed.

  15. Optical properties of transparent cobalt-containing magnesium aluminosilicate glass-ceramics doped with gallium oxide for saturable absorbers

    Science.gov (United States)

    Loiko, P. A.; Skoptsov, N. A.; Dymshits, O. S.; Malyarevich, A. M.; Yumashev, K. V.; Zhilin, A. A.; Alekseeva, I. P.

    2016-10-01

    Transparent glass-ceramic materials based on glasses of the MgO-Al2O3-SiO2-TiO2 system doped with CoO and Ga2O3 are synthesized. The secondary heat treatment of the initial glasses at temperatures of 800-950°C leads to precipitation of nanosized (6-7 nm) crystals of magnesium aluminogallium spinel doped with cobalt ions and magnesium aluminotitanate solid solutions. The optical absorption spectra of the initial glass and glass-ceramic materials are studied. It is shown that the absorption band caused by the 4 A 2(4F)→ 4 T 1(4 F) transitions of tetrahedrally coordinated Co2+ ions in glass-ceramics with nanosized Co:Mg(Al,Ga)2O4 crystals is shifted to longer wavelengths (up to 1.67 µm) compared to the position of this band in materials with Co:MgAl2O4 crystals. The synthesized glass-ceramics are characterized by a relatively low saturation fluence FS 0.5 ± 0.1 J/cm2 at a wavelength of 1.54 µm, as well as by a high radiation resistance to nanosecond laser pulses, which is no lower than 15 ± 2 J/cm2. This explains their attractiveness as materials for saturable absorbers for erbium lasers emitting in the spectral range 1.5-1.7 µm.

  16. Effects of low-level laser therapy on wound healing

    Directory of Open Access Journals (Sweden)

    Fabiana do Socorro da Silva Dias Andrade

    Full Text Available OBJECTIVE: To gather and clarify the actual effects of low-level laser therapy on wound healing and its most effective ways of application in human and veterinary medicine.METHODS: We searched original articles published in journals between the years 2000 and 2011, in Spanish, English, French and Portuguese languages, belonging to the following databases: Lilacs, Medline, PubMed and Bireme; Tey should contain the methodological description of the experimental design and parameters used.RESULTS: doses ranging from 3 to 6 J/cm2 appear to be more effective and doses 10 above J/cm2 are associated with deleterious effects. The wavelengths ranging from 632.8 to 1000 nm remain as those that provide more satisfactory results in the wound healing process.CONCLUSION: Low-level laser can be safely applied to accelerate the resolution of cutaneous wounds, although this fact is closely related to the election of parameters such as dose, time of exposure and wavelength.

  17. Femtosecond pulsed laser textured titanium surfaces with stable superhydrophilicity and superhydrophobicity

    Science.gov (United States)

    Li, Bao-jia; Li, Huang; Huang, Li-jing; Ren, Nai-fei; Kong, Xia

    2016-12-01

    A facile and highly-efficient laser scanning process coupled with a simple silanization modification was used to prepare textured titanium (Ti) surfaces with stable superhydrophilicity and superhydrophobicity. Femtosecond pulsed laser scanning along two mutually perpendicular directions led to the formation of binary structures featuring micrometer-scale spikes covered with nanometer-scale ripples. The period of the spikes significantly increased and the period of the ripples irregularly changed in the narrow range of 550-600 nm with the increase of laser fluence. The obtained laser-textured Ti surfaces were hydrophilic or even superhydrophilic, and the superhydrophilic laser-textured Ti surface using a laser fluence of 1.5 J/cm2 was observed to retain its wetting property after 30 days of storage in ambient atmosphere. After silanization, all the laser-textured Ti surfaces exhibited high hydrophobicity or superhydrophobicity, and the superhydrophobic laser-textured Ti surfaces using laser fluences of 1.5 and 1.8 J/cm2 remained stable when stored in air for over 30 days. The results imply the potential applications of these surfaces in a variety of fields.

  18. Aromatic poly(arylene ether urea) with high dipole moment for high thermal stability and high energy density capacitors

    Science.gov (United States)

    Cheng, Zhaoxi; Lin, Minren; Wu, Shan; Thakur, Yash; Zhou, Yue; Jeong, Dae-Yong; Shen, Qundong; Zhang, Q. M.

    2015-05-01

    Developing dielectric polymers with higher dielectric constant without sacrificing loss and thermal stability is of great importance for next generation of high energy density capacitors. We show here that by replacing the CH2 group in the aromatic polyurea (ArPU) with the polar ether group, thus raising the dipole moment of the molecular unit, poly(arylene ether urea) (PEEU) shows an increased dielectric constant of 4.7, compared with 4.2 of ArPU. Moreover, PEEU maintains the low dielectric loss and is thermally stable up to 250 °C. As a result, the polymer delivers 13 J/cm3 discharged energy density at room temperature and 9 J/cm3 at 120 °C. The high quality films perform well in terms of both breakdown strength (at 700 MV/m at room temperature) and leakage current from room temperature to elevated temperature. At 120 °C, the breakdown strength is 600 MV/m and the conductivity is 1.58 × 10-14 S/cm measured under 100 MV/m.

  19. Influence of CO2 (10.6 μm) and Nd:YAG laser irradiation on the prevention of enamel caries around orthodontic brackets.

    Science.gov (United States)

    Seino, Priscila Yumi; Freitas, Patrícia Moreira; Marques, Márcia Martins; de Souza Almeida, Fernanda Campos; Botta, Sérgio Brossi; Moreira, Maria Stella Nunes Araújo

    2015-02-01

    One possible undesirable consequence of orthodontic therapy is the development of incipient caries lesions of enamel around brackets. The aim of this study was to compare the effects of CO2 (λ = 10.6 μm) and Nd:YAG (λ = 1,064 nm) lasers associated or not with topical fluoride application on the prevention of caries lesions around brackets. Brackets were bonded to the enamel of 65 premolars. The experimental groups (n = 13) were: G1--application of 1.23% acidulated fluoride phosphate gel (AFP, control); G2--Nd:YAG laser irradiation (0.6 W, 84.9 J/cm(2), 10 Hz, 110 μs, contact mode); G3--Nd:YAG laser irradiation associated with AFP; G4--CO2 laser irradiation (0.5 W, 28.6 J/cm(2), 50 Hz, 5 μs, and 10 mm focal distance); and G5--CO2 laser irradiation associated with AFP. Quantitative light-induced fluorescence was used to assess enamel demineralization. The data were statistically compared (α = 5%). The highest demineralization occurred in the Nd:YAG laser group (G2, 26.15% ± 1.94). The demineralization of all other groups was similar to that of the control group. In conclusion, CO2 laser alone was able to control enamel demineralization around brackets at the same level as that obtained with topical fluoride application.

  20. Potential of CO2 lasers (10.6 µm) associated with fluorides in inhibiting human enamel erosion.

    Science.gov (United States)

    Ramos-Oliveira, Thayanne Monteiro; Ramos, Thaysa Monteiro; Esteves-Oliveira, Marcela; Apel, Christian; Fischer, Horst; Eduardo, Carlos de Paula; Steagall, Washington; Freitas, Patricia Moreira de

    2014-01-01

    This in vitro study aimed to investigate the potential of CO2 lasers associated with different fluoride agents in inhibiting enamel erosion. Human enamel samples were randomly divided into 9 groups (n = 12): G1-eroded enamel; G2-APF gel; G3-AmF/NaF gel; G4-AmF/SnF2 solution; G5-CO2 laser (λ = 10.6 µm)+APF gel; G6-CO2 laser+AmF/NaF gel; G7-CO2laser+AmF/SnF2solution; G8-CO2 laser; and G9-sound enamel. The CO2 laser parameters were: 0.45 J/cm2; 6 μs; and 128 Hz. After surface treatment, the samples (except from G9) were immersed in 1% citric acid (pH 4.0, 3 min). Surface microhardness was measured at baseline and after surface softening. The data were statistically analyzed by one-way ANOVA and Tukey's tests (p CO2 laser irradiation at 0.45J/cm2 did not influence its efficacy. CO2 laser irradiation alone under the same conditions could also significantly decrease enamel erosive mineral loss, although at lower levels.

  1. 脉冲强光系统治疗太田痣临床疗效观察%Therapeutic Effect of PhotoDerm in Treatment of Nevus of Ota

    Institute of Scientific and Technical Information of China (English)

    曹光玲; 凌宏忠; 陈闻纳; 廖绮曼; 杨建; 李欢

    2001-01-01

    目的:观察全波长脉冲强光系统(PhotoDerm)治疗太田痣的临床疗效.方法:74例太田痣患者应用全波长脉冲强光治疗系统(PhotoDerm)进行治疗.选用645 nm滤光器、能量密度38J/cm2至42J/cm2、三脉冲、脉宽为2.5ms至3.0ms、脉冲间歇30ms至50ms,治疗间隔3个月~6个月.结果:1次治疗后有效率(治愈+显效+有效)为43.2%,2次治疗后有效率为80%,3次治疗后有效率为97.6%,4次治疗后有效率为100%,5次治疗后显效率为100%.治疗次数与疗效(有效率)呈正相关(R=1,P<0.001).有4例患者获得治愈.结论:PhotoDerm治疗系统治疗太田痣有较好的临床疗效.

  2. Kistimonas scapharcae sp. nov., isolated from a dead ark clam (Scapharca broughtonii), and emended description of the genus Kistimonas.

    Science.gov (United States)

    Lee, Jina; Shin, Na-Ri; Lee, Hae-Won; Roh, Seong Woon; Kim, Min-Soo; Kim, Young-Ok; Bae, Jin-Woo

    2012-12-01

    A Gram-negative, motile, facultatively anaerobic rod, designated A36(T), was isolated from a dead ark clam found on the south coast of Korea. The isolate was catalase- and oxidase-negative. 16S rRNA gene sequence analysis indicated that strain A36(T) was most closely related to Kistimonas asteriae KMD 001(T), with which it shared 98.2% 16S rRNA gene sequence similarity. Strain A36(T) grew optimally at 30-37 °C, with 1% (w/v) NaCl and at pH 8.0. The major respiratory quinone was ubiquinone-9 (Q-9). The major polar lipids were phosphatidylserine, phosphoethanolamine, phosphatidylglycerol and diphosphatidylglycerol. The major fatty acids were summed feature 3 (comprising C(16:1)ω7c and/or iso-C(15) 2-OH) and C(16:0). The genomic DNA G+C content was 47.3 mol%. DNA-DNA relatedness between the isolate and K. asteriae JCM 15607(T) was <25 ± 3%. Strain A36(T) represents a novel species of the genus Kistimonas, for which the name Kistimonas scapharcae sp. nov. is proposed. The type strain is A36(T) ( = KACC 16204(T)  = JCM 17805(T)). An emended description of the genus Kistimonas is also provided.

  3. In vitro biological effects of novel type I photosensitizers and their mechanism of action

    Science.gov (United States)

    Karwa, Amolkumar; Rajagopalan, Raghavan; Poreddy, Amruta R.; Sympson, Carolyn; Cantrell, Gary L.; Dorshow, Richard B.

    2010-02-01

    Photodynamic therapy involving Type 2 photosenstizers has been conspicuously successful in the treatment of various lesions. Type 1 process, in contrast has not received much attention despite its considerable potential. We have prepared several classes of molecules containing fragile bonds that will produce reactive intermediates such as radicals and nitrenes upon photoexcitation with UV-A and visible light. In a primary screen, many of these compounds had a significant concentration and light dose dependent effect on the cell viability on U937. The chemistry of these compounds differentiated their ability to induced cytotoxic effects. To further establish these findings, we tested one compound representing each class of chemistry in three different tumor cell lines. Cells were incubated with three different concentrations (100μM, 25μM and 6.25μM) and exposed to UV light dose of 4J/cm2 and 8J/cm2. The compounds showed varying effects on viability in different cell lines. Finally we also investigated the ability to induce apoptosis as the mechanism of cell death in HCT116 cell lines using the experimental conditions mentioned. The type 1 photosensitizers induced apoptosis as early as 4 hours after exposure in HCT116 cells and the rate of apoptosis increased with time with majority of cells in late apoptotic or necrotic stage.

  4. A comparison of systemic photochemotherapy with 8-methoxypsoralen (8-MOP and with trimethylpsoralen (TMP in vitiligo

    Directory of Open Access Journals (Sweden)

    Mhaske Vandana

    1998-01-01

    Full Text Available Oral 8-MOP and TMP were compared in the PUVA therapy for vitiligo. Group A (25 cases was initiated on 0.3 mg/kg of 8-MOP with 1/2 Joule/cm2 of UVA and weekly increments of 1/2 Joule/ cm2 and Group B was started on 0.6 mg/kg of TMP with 1 Joule/cm2 of UVA and weekly increments of 1 Joule/cm2. Therapy was given thrice a week. Repigmentation was evaluated by using a 0-6 scale. At the end of 60 sittings, on acceptable cosmetic response was seen over the face, neck and upper extremities in both groups, while trunk and lower extremities showed lesser response. 8-MOP gave earlier response, needing a lower cumulative UVA dose i.e. 75 J/cm2 as compared to TMP i.e. 106 J/cm2. Phototoxicity was seen more often with 8-MOP. In conclusion, in Indians, 8-MOP is the drug of choice in PUVA therapy of vitiligo provided precautions against phototoxicity are adequate.

  5. Photocytotoxicity in human dermal fibroblasts elicited by permanent makeup inks containing titanium dioxide.

    Science.gov (United States)

    Wamer, Wayne G; Yin, Jun-Jie

    2011-01-01

    Titanium dioxide (TiO2) is a pigment widely used in decorative tattoo and permanent makeup inks. However, little is known about the risks associated with its presence in these products. We have developed an in vitro assay to identify inks containing TiO2 that are cytotoxic and/or photocytotoxic. The presence of TiO2 in ten permanent makeup inks was established by X-ray fluorescence. Using X-ray diffraction, we found that seven inks contained predominately TiO2 (anatase), the more photocatalytically active crystalline form of TiO2. The remaining inks contained predominately TiO2 (rutile). To identify cytotoxic and/or photocytotoxic inks, human dermal fibroblasts were incubated for 18 h in media containing inks or pigments isolated from inks. Fibroblasts were then irradiated with 10 J/cm2 UVA radiation combined with 45 J/cm2 visible light for determining photocytotoxicity, or kept in the dark for determining cytotoxicity. Toxicity was assessed as inhibition of colony formation. No inks were cytotoxic. However eight inks, and the pigments isolated from these inks, were photocytotoxic. Using ESR, we found that most pigments from photocytotoxic inks generated hydroxyl radicals when photoexcited with UV radiation. Therefore, the possibility of photocytotoxicity should be considered when evaluating the safety of permanent makeup inks containing TiO2.

  6. Streptomyces gamaensis sp. nov., a novel actinomycete with antifungal activity isolated from soil in Gama, Chad.

    Science.gov (United States)

    Zhao, Shanshan; Ye, Lan; Liu, Chongxi; Abagana, Adam Yacoub; Zheng, Weiwei; Sun, Pengyu; Li, Jiansong; Xiang, Wensheng; Wang, Xiangjing

    2017-04-01

    During an investigation exploring potential sources of novel species and natural products, a novel actinomycete with antifungal activity, designated strain NEAU-Gz11(T), was isolated from a soil sample, which was collected from Gama, Chad. The isolate was found to have morphological and chemotaxonomic characteristics typical of members of the genus Streptomyces. 16S rRNA gene sequence similarity studies showed that strain NEAU-Gz11(T) belongs to the genus Streptomyces with high sequence similarity to Streptomyces hiroshimensis JCM 4098(T) (98.0 %). Similarities to other type strains of the genus Streptomyces were lower than 98.0 %. However, the physiological and biochemical characteristics and low levels of DNA-DNA relatedness could differentiate the isolate genotypically and phenotypically from S. hiroshimensis JCM 4098(T). Therefore, the strain is concluded to represent a novel species of the genus Streptomyces, for which the name Streptomyces gamaensis sp. nov. is proposed. The type strain is NEAU-Gz11(T) (=CGMCC 4.7304(T)=DSM 101531(T)).

  7. 脉冲掺钕钇铝石榴石激光对增生性瘢痕成纤维细胞胶原合成的影响%Effects of pulsed Nd:YAG laser on collagen synthesis in hypertrophic scar derived fibroblast cultures

    Institute of Scientific and Technical Information of China (English)

    舒彬; 郝林林; 曾登芬

    2002-01-01

    Objective In order to explore the selectively inhibitory effects of pulsed Nd:YAG laser irradiation on collagen production of scar fibroblasts in vitro.Methods Cultured fibroblasts derived from hypertrophic scars(HS) and normal human skin were irradiated with a pulsed Nd:YAG laser(wavelength 1 064 nm,pulse width 150 μ s) at various energy density levels (500,1 000,1 500 and 2 000 J/cm2).At 24 hours after laser irradiation, collagen production of fibroblasts was measured by the incorporation of 3H proline. The expression of proα 1(I)procollagen mRNA was investigated by blot hybridization techniques. Results Collagen production of HS fibroblasts was significantly increased, as 2 times as that of normal skin fibroblasts. Type I procollagen mRNA level in HS fibroblasts was markedly elevated, as 3 times as that in normal skin fibroblasts.Conclusion Pulsed Nd:YAG laser at energy density of 1 000 J/cm2 can selectively suppress collagen synthesis and type I procollagen mRNA level of HS fibroblasts.

  8. Low threshold Amplified Spontaneous Emission properties in deep blue of poly[(9,9-dioctylfluorene-2,7-dyil)-alt-p-phenylene] thin films

    Science.gov (United States)

    Lattante, Sandro; De Giorgi, Maria Luisa; Pasini, Mariacecilia; Anni, Marco

    2017-10-01

    Amongst the different optoelectronic applications of conjugated polymers, the development of new active materials for optically pumped organic lasers is still an open question particularly in the blue-near UV spectral range. We investigate the emission properties of poly[(9,9-dioctylfluorene-2,7-dyil)- alt-p-phenylene] (PFP) neat films under nanosecond pump. We demonstrate that thanks to the introduction of a phenylene moiety between two fluorene units it is possible to obtain Amplified Spontaneous Emission (ASE) with a lower threshold and a blue shifted wavelength with respect to poly(9,9-dioctylfluorene) (PFO). We demonstrate efficient ASE with a minimum threshold as low as 23 μJcm-2 and a minimum ASE wavelength of 436 nm. A maximum net optical gain of about 26 cm-1 is measured at an excitation density of 0.23 mJcm-2. These results make the PFP a good active material for optically pumped deep blue organic lasers.

  9. In vitro effect of Q-switched Nd:YAG laser exposure on morphology, hydroxyapatite composition and microhardness properties of human dentin

    Directory of Open Access Journals (Sweden)

    Retna Apsari

    2011-12-01

    Full Text Available Background: A Q-switched Nd:YAG laser was employed as a source of ablation. The fundamental wavelength of the laser is 1064 nm, with pulse duration of 8 nanosecond operates with uniphase mode of TEM00. In the following experiments, dentin samples (without caries and plaque are exposed to pulse laser with Q-switching effect at various energy dose. Purpose: The aim of this study was to investigate the effect of laser ablation on dentin samples using Q-switched Nd:YAG laser exposure. Methods: The laser was operated in repetitive mode with frequency of 10 Hz. The energy dose of the laser was ranging from 13.9 J/cm2, 21.2 J/cm2 and 41.7 J/cm2. The target material comprised of human dentin. The laser was exposed in one mode with Q-switched Nd:YAG laser. Energy delivered to the target through free beam technique. The exposed human dentin was examined by using x-ray diffraction (XRD and fluoresence scanning electron microscopy for energy dispersive (FESEM-EDAX. Microhardness of human dentin were examined by using microhardness vickers test (MVT. Results: The result obtained showed that the composition of hydroxyapatite of the dentin after exposed by Q-switched Nd:YAG laser are 75.02% to 78.21%, with microhardness of 38.7 kgf/mm2 to 86.6 kgf/mm2. This indicated that exposed pulsed Nd:YAG laser on the human dentin attributed to the phototermal effect. The power density created by the Q-switched Nd:YAG laser enables the heat to produce optical breakdown (melting and hole associated with plasma formation and shock wave propagation, from energy dose of 21.2 J/cm2. From XRD analysis showed that the exposure of Nd:YAG laser did not involve in changing the crystal structure of the dentin, but due to photoablation effect. Conclusion: In conclusion, the application of Q-switched Nd:YAG laser as contactless drills in dentistry should be regarded as an alternative to the classical mechanical technique to improve the quality of the dentin treatment.Latar belakang

  10. Low-level laser therapy for the prevention of low salivary flow rate after radiotherapy and chemotherapy in patients with head and neck cancer.

    Science.gov (United States)

    Gonnelli, Fernanda Aurora Stabile; Palma, Luiz Felipe; Giordani, Adelmo José; Deboni, Aline Lima Silva; Dias, Rodrigo Souza; Segreto, Roberto Araújo; Segreto, Helena Regina Comodo

    2016-01-01

    To determine whether low-level laser therapy can prevent salivary hypofunction after radiotherapy and chemotherapy in head and neck cancer patients. We evaluated 23 head and neck cancer patients, of whom 13 received laser therapy and 10 received clinical care only. An InGaAlP laser was used intra-orally (at 660 nm and 40 mW) at a mean dose of 10.0 J/cm(2) and extra-orally (at 780 nm and 15 mW) at a mean dose of 3.7 J/cm(2), three times per week, on alternate days. Stimulated and unstimulated sialometry tests were performed before the first radiotherapy and chemotherapy sessions (N0) and at 30 days after the end of treatment (N30). At N30, the mean salivary flow rates were significantly higher among the laser therapy patients than among the patients who received clinical care only, in the stimulated and unstimulated sialometry tests (p = 0.0131 and p = 0.0143, respectively). Low-level laser therapy, administered concomitantly with radiotherapy and chemotherapy, appears to mitigate treatment-induced salivary hypofunction in patients with head and neck cancer.

  11. Effect of low-level laser therapy on irradiated parotid glands—study in mice

    Science.gov (United States)

    Acauan, Monique Dossena; Gomes, Ana Paula Neutziling; Braga-Filho, Aroldo; de Figueiredo, Maria Antonia Zancanaro; Cherubini, Karen; Salum, Fernanda Gonçalves

    2015-10-01

    The objective of this study was to evaluate the effect of low-level laser therapy (LLLT) on radiotherapy-induced morphological changes and caspase-3 immunodetection in parotids of mice. Forty-one Swiss mice were divided into control, radiotherapy, 2- and 4-J laser groups. The experimental groups were exposed to ionizing radiation in a single session of 10 Gy. In the laser groups, a GaAlAs laser (830 nm, 100 mW, 0.028 cm2, 3.57 W/cm2) was used on the region corresponding to the parotid glands, with 2-J energy (20 s, 71 J/cm2) or 4 J (40 s, 135 J/cm2) per point. LLLT was performed immediately before and 24 h after radiotherapy. One point was applied in each parotid gland. The animals were euthanized 48 h or 7 days after radiotherapy and parotid glands were dissected for morphological analysis and immunodetection of caspase-3. There was no significant difference between groups in the immunodetection of caspase-3, but the laser groups had a lower percentage compared to the radiotherapy group. LLLT promoted the preservation of acinar structure, reduced the occurrence of vacuolation, and stimulated parotid gland vascularization. Of the two LLLT protocols, the one using 4 J of energy showed better results.

  12. Proliferation of chicken fibroblasts induced by light-emitting diodes: a comparative trial for different wavelengths

    Science.gov (United States)

    Vinck, Elke; Cagnie, B.; Declercq, H.; Cornelissen, R.; Cambier, D.

    2003-12-01

    The effectiveness and applicability of a variety of light sources, in the treatment of wounds has thoroughly been investigated, in vitro as well as in vivo. The current commercial availability of Light Emitting Diode (LED) sources therefore also invites research to explore the effect of low power infrared, red and green light on wound healing, e.g. by means of fibroblast proliferation. Therefore a controlled and randomized study on cultured embryonic chicken fibroblasts was conducted. The fibroblasts were irradiated during three consecutive days, at several wavelengths (950 nm, 660 nm and 570 nm) and a respective power output of 160 mW, 80 mW or 10 mW. Treatment duration varied from 1 minute to 3 minutes to obtain a surface energy density of 0.9 J/cm2 (infrared and red light) or 0.2 J/cm2 (green light). Statistical analysis revealed that LED irradiation for all three wavelengths induced a higher rate of proliferation in comparison of the control group. This difference was statistically significant (p cells, than the red (p < .001) an the infrared probe (p < .001). Furthermore, the red probe provided a higher increase (p < .001) than the IR probe. LED irradiation results in an increased fibroblast proliferation in vitro. This outcome postulates beneficial stimulatory effects of LED at the applied wavelength, energy density and power output on wound healing in vivo. Further investigation is necessary to examine this hypothesis.

  13. Biomodulatory effects of laser irradiation on dental pulp cells in vitro

    Science.gov (United States)

    Milward, Michael R.; Hadis, Mohammed A.; Cooper, Paul R.; Gorecki, Patricia; Carroll, James D.; Palin, William M.

    2015-03-01

    Low level laser/light therapy (LLLT) or photobiomodulation is a biophysical approach that can be used to reduce pain, inflammation and modulate tissue healing and repair. However, its application has yet to be fully realized for dental disease treatment. The aim of this study was to assess the modulation of dental pulp cell (DPC) responses using two LLLT lasers with wavelengths of 660nm and 810nm. Human DPCs were isolated and cultured in phenol-red-free α- MEM/10%-FCS at 37°C in 5% CO2. Central wells of transparent-based black walled 96-microplates were seeded with DPCs (passages 2-4; 150μL; 25,000 cell/ml). At 24h post-seeding, cultures were irradiated using a Thor Photomedicine LLLT device (THOR Photomedicine, UK) at 660nm (3, 6 or 13s to give 2, 5 and 10J/cm2) or 810nm (for 1, 2 or 5s to deliver 5, 10 and 20J/cm2). Metabolic activity was assessed via a modified MTT assay 24h post-irradiation. Statistical differences were identified using analysis of variance and post-hoc Tukey tests (P=0.05) and compared with nonirradiated controls. Significantly higher MTT activity was obtained for both lasers (Pstatistical significance from control (P>0.05). Consequently, enhanced irradiation parameters was apparent for both lasers. These parameters should be further optimised to identify the most effective for therapeutic application.

  14. Laser-induced periodic surface structures of thin, complex multi-component films

    Science.gov (United States)

    Reif, Juergen; Varlamova, Olga; Ratzke, Markus; Uhlig, Sebastian

    2016-04-01

    Femtosecond laser-induced regular nanostructures are generated on a complex multilayer target, namely a piece of a commercial, used hard disk memory. It is shown that after single-shot 800-nm irradiation at 0.26 J/cm2 only the polymer cover layer and—in the center—a portion of the magnetic multilayer are ablated. A regular array of linearly aligned spherical 450-nm features at the uncovered interface between cover and magnetic layers appears not to be produced by the irradiation. Only after about 10 pulses on one spot, classical ripples perpendicular to the laser polarization with a period of ≈700 nm are observed, with a modulation between 40 nm above and 40 nm below the pristine surface and an ablation depth only slightly larger than the thickness of the multilayer magnetic film. Further increase of the pulse number does not result in deeper ablation. However, 770-nm ripples become parallel to the polarization and are swelling to more than 120 nm above zero, much more than the full multilayer film thickness. In the spot periphery, much shallower 300-nm ripples are perpendicular to the strong modulation and the laser polarization. Irradiation with 0.49-J/cm2 pulses from an ultrafast white-light continuum results—in the spot periphery—in the formation of 200-nm ripples, only swelling above zero after removal of the polymer cover, without digging into the magnetic film.

  15. Improved nonlinear optical and optical limiting properties in non-covalent functionalized reduced graphene oxide/silver nanoparticle (NF-RGO/Ag-NPs) hybrid

    Science.gov (United States)

    Sakho, El hadji Mamour; Oluwafemi, Oluwatobi S.; Sreekanth, P.; Philip, Reji; Thomas, Sabu; Kalarikkal, Nandakumar

    2016-08-01

    Nonlinear optical (NLO) response under near infrared (800 nm) and visible (532 nm) laser excitations, of 100 fs (fs) and 5 ns (ns) pulse durations respectively, of reduced graphene oxide (RGO), non-covalent functionalized reduced graphene oxide (NF-RGO) and NF-RGO decorated with various concentration of silver nanoparticles (NF-RGO/Ag-NPs) have been investigated using the Open-aperture Z-Scan technique. For both femtosecond and nanosecond laser excitations, the studied graphene-based materials exhibit good nonlinear optical power limiting properties (OL), with NF-RGO/Ag-NPs sample prepared with 0.1 M AgNO3 showing the best nonlinear optical properties. For the ns regime, the optical limiting threshold decreased from 8.3 J/cm2 in NF-RGO to 4.3 J/cm2 in NF-RGO/Ag-NPs, while at fs regime, the nonlinear absorption coefficient (β) was found to increase with decrease in concentration of Ag-NPs in the hybrid. Two-photon absorption (2 PA) in combination with saturable absorption (SA) in femtosecond regime, and reverse saturable absorption (RSA) along with saturable absorption (SA) in the nanosecond regime, are responsible for the observed nonlinear optical absorption (NLA) behavior in these materials. These findings show that the as-synthesized NF-RGO/Ag-NPs hybrid is a relatively better material for nonlinear optical limiting applications.

  16. Experimental reproduction of polymorphous light eruption and benign summer light eruption by whole-body UVA irradiation.

    Science.gov (United States)

    Lambert, J; Verheyen, A; Dockx, P

    1997-01-01

    The entity 'benign summer light eruption' (BSLE) has been introduced to make a clinical subdivision in the heterogeneous group of polymorphous light eruptions (PLE). Provocation tests for PLE are not always easy to perform and require expensive apparatus. Our purpose was to evaluate a provocation test that could be readily done by a dermatologist with a UVA cabin. Provocation tests are currently required in order to obtain a financial contribution from the social security services in Belgium. In addition, we were interested in determining whether the results of the provocation test would permit us to differentiate between the clinical entities of BSLE and PLE. We studied the efficacy of whole-body UVA irradiation for BSLE and PLE patients. A total of 45 patients was tested, of whom 26 were diagnosed as having BSLE and 19 PLE. In the BSLE group, 24 patients (92%) presented lesions. In the PLE group, 15 patients (79%) had a reaction, but 3 had a positive UVB test. The mean dose to induce lesions was 65.96 J/cm2 for the BSLE group and 52.86 J/cm2 for the PLE group. We conclude that the whole-body UVA test is a high-performance provocation test for both BSLE and PLE patients although it cannot differentiate the two entities from one another.

  17. Preclinical studies of vascular acting photosensitizer bacteriopheophorbide for the treatment of prostate cancer

    Science.gov (United States)

    Hetzel, Fred W.; Chen, Qun; Luck, David; Beckers, Jill; Huang, Zheng

    2004-06-01

    Photodynamic therapy (PDT) mediated with vascular acting photosensitizer pd-bacteriopheophorbide (Tookad), is investigated as an alternative modality for the total ablation of prostate cancer. In vivo normal canine prostate is used as the animal model. Interstitial PDT was performed by irradiating the surgically exposed prostates with a diode laser (763 nm, 150 mW/cm) to activate the IV infused photosensitizer drug. The prostate and its adjacent tissues were harvested and subjected to histopathological examination. At one-week post PDT, the animals recovered well with little or no urethral complications. Prostatic urethra and prostate adjacent tissues (bladder and underlying colon) were well preserved. PDT induced prostate lesions were characterized by marked hemorrhagic necrosis. Prostate lesions could be detected by MRI scan as early as 48 h post PDT. Maximum lesion size of 1.5 cm3 and 2.9 cm3 could be achieved at 50 J/cm and 100 J/cm, respectively, with interstitial treatment using a single 1-cm diffuser fiber, suggesting the Tookad-PDT is very effective in ablating prostatic tissue. Pharmacokinetic studies show that the photosensitizer is cleared rapidly from the circulation. In conclusion, the novel photosensitizer Tookad mediated PDT may provide an effective alternative to treat localized prostate cancer.

  18. Determination of scattering properties and damage thresholds in tissue using ultrafast laser ablation

    Science.gov (United States)

    Martin, Chris; Ben-Yakar, Adela

    2016-11-01

    Ultrafast laser surgery of tissue requires precise knowledge of the tissue's optical properties to control the extent of subsurface ablation. Here, we present a method to determine the scattering lengths, ℓs, and fluence thresholds, Fth, in multilayered and turbid tissue by finding the input energies required to initiate ablation at various depths in each tissue layer. We validated the method using tissue-mimicking phantoms and applied it to porcine vocal folds, which consist of an epithelial (ep) layer and a superficial lamina propia (SLP) layer. Across five vocal fold samples, we found ℓ=51.0±3.9 μm, F=1.78±0.08 J/cm2, ℓ=26.5±1.6 μm, and F=1.14±0.12 J/cm2. Our method can enable personalized determination of tissue optical properties in a clinical setting, leading to less patient-to-patient variability and more favorable outcomes in operations, such as femto-LASIK surgery.

  19. Evaluation of vascular effects after photodynamic and photothermal therapies using benzoporphyrin derivative monoacid ring A on a rodent dorsal skinfold model

    Science.gov (United States)

    Smith, Tia K.; Choi, Bernard; Ramirez-San-Juan, Julio C.; Nelson, John S.; Kelly, Kristen M.

    2005-04-01

    Background and Objectives: Pulsed dye laser (PDL) irradiation is the standard clinical treatment for vascular lesions. However, PDL treatment of port wine stain birthmarks (PWS) is variable and unpredictable. Photodynamic therapy (PDT) using benzoporphyrin derivative monoacid ring A (BPD) and yellow light may induce substantial vascular effects and potentially offer a more effective treatment. In this study, we utilize a rodent dorsal skinfold model to evaluate the vascular effects of BPD-PDT at 576 nm as compared to PDL. Study Design/Materials and Methods: A dorsal skinfold window was created on the backs of female Sprague-Dawley rats, allowing epidermal and subdermal irradiation and subdermal imaging. One mg/kg BPD was administered intravenously via a jugular venous catheter. Study groups were: control (no BPD, no light), PDL (585 nm, τp 1.5 ms, 10 J/cm2), and PDT (BPD + continuous wave irradiation (CW) at 576nm, τp 16 min, 96 J/cm2). Vessels were imaged and assessed for damage using laser speckle imaging (LSI) before, immediately after, and 18 hours post-intervention. Results: Epidermal irradiation was accomplished without blistering, scabbing or ulceration. PDL and PDT resulted in similar reductions in vascular perfusion 18 hours post-intervention (34.6% and 33.4%, respectively). Conclusions: BPD-PDT can achieve safe and selective vascular effects and may offer an alternative therapeutic option for treatment of hypervascular skin lesions including PWS birthmarks.

  20. Ultra high energy density nanocomposite capacitors using surface-functionalized BaTiO3 nanowires and PVDF-TrFE-CFE

    Science.gov (United States)

    Tang, Haixiong; Lin, Yirong; Sodano, Henry A.

    2012-04-01

    High energy density capacitors are critically important in advanced electronic devices and electric power systems due to their reduced weight, size and cost to meet desired applications. Nanocomposites hold strong potential for increased performance, however, the energy density of most nanocomposites is still low compared to commercial capacitors and neat polymers. Here, high energy density nanocomposite capacitors are fabricated using surface-functionalized high aspect ratio barium titanate (BaTiO3) nanowires (NWs) in a poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) matrix. These nanocomposites have 63.5% higher dielectric permittivity compared to previous nanocomposites with BaTiO3 nanoparticles and also have high breakdown strength. At a 17.5% volume fraction, the nanocomposites show more than 145.3% increase in energy density above that of the pure P(VDF-TrFE- CFE) polymer (10.48 J/cm3 compared to 7.21 J/cm3). This value is significant and exceeds those reported for the conventional polymer-ceramic composites; it is also more than two times larger than high performance commercial materials. The findings of this research could lead to broad interest due to the potential for fabricating next generation energy storage devices.

  1. Streptococcus loxodontisalivarius sp. nov. and Streptococcus saliviloxodontae sp. nov., isolated from oral cavities of elephants.

    Science.gov (United States)

    Saito, Masanori; Shinozaki-Kuwahara, Noriko; Hirasawa, Masatomo; Takada, Kazuko

    2014-09-01

    Four Gram-stain-positive, catalase-negative, coccoid-shaped organisms were isolated from elephant oral cavities. The isolates were tentatively identified as streptococcal species based on the results of biochemical tests. Comparative 16S rRNA gene sequencing studies confirmed the organisms to be members of the genus Streptococcus. Two isolates (NUM 6304(T) and NUM 6312) were related most closely to Streptococcus salivarius with 96.8 % and 93.1 % similarity based on the 16S rRNA gene and the RNA polymerase β subunit encoding gene (rpoB), respectively, and to Streptococcus vestibularis with 83.7 % similarity based on the 60 kDa heat-shock protein gene (groEL). The other two isolates (NUM 6306(T) and NUM 6318) were related most closely to S. vestibularis with 97.0 % and 82.9 % similarity based on the 16S rRNA and groEL genes, respectively, and to S. salivarius with 93.5 % similarity based on the rpoB gene. Based on phylogenetic and phenotypic evidence, these isolates are suggested to represent novel species of the genus Streptococcus, for which the names Streptococcus loxodontisalivarius sp. nov. (type strain NUM 6304(T) = JCM 19287(T) = DSM 27382(T)) and Streptococcus saliviloxodontae sp. nov. (type strain NUM 6306(T) = JCM 19288(T) = DSM 27513(T)) are proposed.

  2. Streptococcus orisasini sp. nov. and Streptococcus dentasini sp. nov., isolated from the oral cavity of donkeys.

    Science.gov (United States)

    Takada, Kazuko; Saito, Masanori; Tsudukibashi, Osamu; Hiroi, Takachika; Hirasawa, Masatomo

    2013-08-01

    Four Gram-positive, catalase-negative, coccoid isolates that were obtained from donkey oral cavities formed two distinct clonal groups when characterized by phenotypic and phylogenetic studies. From the results of biochemical tests, the organisms were tentatively identified as a streptococcal species. Comparative 16S rRNA gene sequencing studies confirmed the organisms to be members of the genus Streptococcus. Two of the isolates were related most closely to Streptococcus ursoris with 95.6 % similarity based on the 16S rRNA gene and to Streptococcus ratti with 92.0 % similarity based on the 60 kDa heat-shock protein gene (groEL). The other two isolates, however, were related to Streptococcus criceti with 95.0 and 89.0 % similarities based on the 16S rRNA and groEL genes, respectively. From both phylogenetic and phenotypic evidence, the four isolates formed two distinct clonal groups and are suggested to represent novel species of the genus Streptococcus. The names proposed for these organisms are Streptococcus orisasini sp. nov. (type strain NUM 1801(T) = JCM 17942(T) = DSM 25193(T)) and Streptococcus dentasini sp. nov. (type strain NUM 1808(T) = JCM 17943(T) = DSM 25137(T)).

  3. Membrane filter method to study the effects of Lactobacillus acidophilus and Bifidobacterium longum on fecal microbiota.

    Science.gov (United States)

    Shimizu, Hidenori; Benno, Yoshimi

    2015-11-01

    A large number of commensal bacteria inhabit the intestinal tract, and interbacterial communication among gut microbiota is thought to occur. In order to analyze symbiotic relationships between probiotic strains and the gut microbiota, a ring with a membrane filter fitted to the bottom was used for in vitro investigations. Test strains comprising probiotic nitto strains (Lactobacillus acidophilus NT and Bifidobacterium longum NT) and type strains (L. acidophilus JCM1132(T) and B. longum JCM1217(T) ) were obtained from diluted fecal samples using the membrane filter to simulate interbacterial communication. Bifidobacterium spp., Streptococcus pasteurianus, Collinsella aerofaciens, and Clostridium spp. were the most abundant gut bacteria detected before coculture with the test strains. Results of the coculture experiments indicated that the test strains significantly promote the growth of Ruminococcus gnavus, Ruminococcus torques, and Veillonella spp. and inhibit the growth of Sutterella wadsworthensis. Differences in the relative abundances of gut bacterial strains were furthermore observed after coculture of the fecal samples with each test strain. Bifidobacterium spp., which was detected as the dominant strain in the fecal samples, was found to be unaffected by coculture with the test strains. In the present study, interbacterial communication using bacterial metabolites between the test strains and the gut microbiota was demonstrated by the coculture technique. The detailed mechanisms and effects of the complex interbacterial communications that occur among the gut microbiota are, however, still unclear. Further investigation of these relationships by coculture of several fecal samples with probiotic strains is urgently required.

  4. Atomic layer deposition for fabrication of HfO2/Al2O3 thin films with high laser-induced damage thresholds.

    Science.gov (United States)

    Wei, Yaowei; Pan, Feng; Zhang, Qinghua; Ma, Ping

    2015-01-01

    Previous research on the laser damage resistance of thin films deposited by atomic layer deposition (ALD) is rare. In this work, the ALD process for thin film generation was investigated using different process parameters such as various precursor types and pulse duration. The laser-induced damage threshold (LIDT) was measured as a key property for thin films used as laser system components. Reasons for film damaged were also investigated. The LIDTs for thin films deposited by improved process parameters reached a higher level than previously measured. Specifically, the LIDT of the Al2O3 thin film reached 40 J/cm(2). The LIDT of the HfO2/Al2O3 anti-reflector film reached 18 J/cm(2), the highest value reported for ALD single and anti-reflect films. In addition, it was shown that the LIDT could be improved by further altering the process parameters. All results show that ALD is an effective film deposition technique for fabrication of thin film components for high-power laser systems.

  5. Low-power GaAlAs laser irradiation promotes the proliferation and osteogenic differentiation of stem cells via IGF1 and BMP2.

    Directory of Open Access Journals (Sweden)

    Jyun-Yi Wu

    Full Text Available Low-power laser irradiation (LPLI has been found to induce various biological effects and cellular processes. Also, LPLI has been shown to promote fracture repair. Until now, it has been unclear how LPLI promotes bone formation and fracture healing. The aim of this study was to investigate the potential mechanism of LPLI-mediated enhancement of bone formation using mouse bone marrow mesenchymal stem cells (D1 cells. D1 cells were irradiated daily with a gallium-aluminum-arsenide (GaAlAs laser at dose of 0, 1, 2, or 4 J/cm(2. The lactate dehydrogenase (LDH assay showed no cytotoxic effects of LPLI on D1 cells, and instead, LPLI at 4 J/cm(2 significantly promoted D1 cell proliferation. LPLI also enhanced osteogenic differentiation in a dose-dependent manner and moderately increased expression of osteogenic markers. The neutralization experiments indicated that LPLI regulated insulin-like growth factor 1 (IGF1 and bone morphogenetic protein 2 (BMP2 signaling to promote cell proliferation and/or osteogenic differentiation. In conclusion, our study suggests that LPLI may induce IGF1 expression to promote both the proliferation and osteogenic differentiation of D1 cells, whereas it may induce BMP2 expression primarily to enhance osteogenic differentiation.

  6. Photo-biomodulatory response of low-power laser irradiation on burn tissue repair in mice.

    Science.gov (United States)

    Rathnakar, Bharath; Rao, Bola Sadashiva Satish; Prabhu, Vijendra; Chandra, Subhash; Rai, Sharada; Rao, Anuradha Calicut Kini; Sharma, Mrinalini; Gupta, Pradeep Kumar; Mahato, Krishna Kishore

    2016-12-01

    The present work reports the photo-biomodulatory effect of red (632.8 nm) and near infrared (785 and 830 nm) lasers on burn injury in Swiss albino mice. Animals were induced with a 15-mm full thickness burn injury and irradiated with various fluences (1, 2, 3, 4, and 6 J/cm(2)) of each laser wavelength under study having a constant fluence rate (8.49 mW/cm(2)). The size of the injury following treatment was monitored by capturing the wound images at regular time intervals until complete healing. Morphometric assessment indicated that the group treated with 3-J/cm(2) fluence of 830 nm had a profound effect on healing as compared to untreated controls and various fluences of other wavelengths under study. Histopathological assessment of wound repair on treatment with an optimum fluence (3 J/cm(2)) of 830 nm performed on days 2, 6, 12, and 18 post-wounding resulted in enhanced wound repair with migration of fibroblasts, deposition of collagen, and neovascularization as compared to untreated controls. The findings of the present study have clearly demonstrated that a single exposure of 3-J/cm(2) fluence at 830-nm enhanced burn wound healing progression in mice, which is equivalent to 5 % povidone iodine treatment (reference standard), applied on a daily basis till complete healing.

  7. A comparison of the DPSS UV laser ablation characteristic of 1024 and H10F WC-Co

    Science.gov (United States)

    See, Tian Long; Chantzis, Dimitrios; Royer, Raphael; Metsios, Ioannis; Antar, Mohammad; Marimuthu, Sundar

    2017-07-01

    An investigation on ablation characteristics of 1024 and H10F cobalt cemented tungsten carbide (WC-Co) with a DPSS nanosecond UV laser (50 ns pulse width, 355 nm wavelength, 90 W average power and 10 kHz repetition rate) is presented. The ablation characteristic parameters such as ablation threshold, incubation effect and optical penetration depth were evaluated based on the spot ablation diameter and depth. It was observed that the ablation threshold is significantly influenced by the number of pulses (NOP) and it decreases with increase NOP which is attributed to the incubation effect. Only one ablation region is observed at low laser fluence and an additional molten ablation region is observed at high laser fluence accompanied with cracks. The cracks formation is due to the thermal induced stress and changes in WC microstructure during laser beam irradiation. The crack depth is proportional to the thickness of the molten WC region. The ablation threshold of 1024 WC-Co and H10F WC-Co were found to be Fth1 =4.32 J/cm2 and Fth1 =4.26 J/cm2 respectively. The difference in chemical composition has insignificant effect on the ablation threshold value of the material. The incubation factor and optical penetration depth values of 1024 WC-Co and H10F WC-Co were found to be ξ=0.73, α-1 =411 nm and ξ=0.75, α-1 =397 nm respectively.

  8. Comparative effects of wavelengths of low-power laser in regeneration of sciatic nerve in rats following crushing lesion.

    Science.gov (United States)

    Barbosa, Rafael Inácio; Marcolino, Alexandre Marcio; de Jesus Guirro, Rinaldo Roberto; Mazzer, Nilton; Barbieri, Cláudio Henrique; de Cássia Registro Fonseca, Marisa

    2010-05-01

    Peripheral nerves are structures that, when damaged, can result in significant motor and sensory disabilities. Several studies have used therapeutic resources with the aim of promoting early nerve regeneration, such as the use of low-power laser. However, this laser therapy does not represent a consensus regarding the methodology, thus yielding controversial conclusions. The objective of our study was to investigate, by functional evaluation, the comparative effects of low-power laser (660 nm and 830 nm) on sciatic nerve regeneration following crushing injuries. Twenty-seven Wistar rats subjected to sciatic nerve injury were divided into three groups: group sham, consisting of rats undergoing simulated irradiation; a group consisting of rats subjected to gallium-aluminum-arsenide (GaAlAs) laser at 660 nm (10 J/cm(2), 30 mW and 0.06 cm(2) beam), and another one consisting of rats subjected to GaAlAs laser at 830 nm (10 J/cm(2), 30 mW and 0.116 cm(2)). Laser was applied to the lesion for 21 days. A sciatic functional index (SFI) was used for functional evaluation prior to surgery and on days 7, 14, and 21 after surgery. Differences in SFI were found between group 660 nm and the other ones at the 14th day. One can observe that laser application at 660 nm with the parameters and methods utilised was effective in promoting early functional recovery, as indicated by the SFI, over the period evaluated.

  9. Effect of laser (λ 660 nm) and LED (λ 630 nm) photobiomodulation on formocresol-induced oral ulcers: a clinical and histological study on rodents.

    Science.gov (United States)

    de Carvalho, Fabiola Bastos; Andrade, Aline Silva; Rasquin, Luis Cardoso; de Castro, Isabele Vieira; Cangussu, Maria Cristina Teixeira; Pinheiro, Antônio Luiz Barbosa; dos Santos, Jean Nunes

    2015-01-01

    The aim of this study was to evaluate, clinically and histologically, the influence of laser and LED photobiomodulation in the healing of formocresol-induced oral mucosa ulcers of rats. We used 60 Wistar rats in which oral ulcers were induced on the gingiva of the lower incisors. Forty-eight hours after inducing the ulcers, the animals were divided into three groups: laser, LED, and untreated. Animals from the laser group received irradiation with GaAlAs, 660 nm, CW, 40 mW, φ 4 mm(2), 4.8 J/cm(2). Animals from the LED group received irradiation with InGaAIP, 630 nm, 150 mW, 4.8 J/cm(2), 0.8 cm spot. Forty-eight hours after oral ulcer induction, both irradiations were applied in a punctuate manner in the center of the ulcer at 48-h interval until the end of the experimental period. The animals were killed at 3, 5, 7, and 11 days after day 0. The results of the clinical evaluation showed that the laser and LED phototherapies were able to accelerate the healing of formocresol-induced oral ulcers, which occurred first in the laser group (ANOVA, p formocresol-induced oral ulcers in both clinical and histological aspects.

  10. Paenibacillus guangzhouensis sp. nov., an Fe(III)- and humus-reducing bacterium from a forest soil.

    Science.gov (United States)

    Li, Jibing; Lu, Qin; Liu, Ting; Zhou, Shungui; Yang, Guiqin; Zhao, Yong

    2014-11-01

    A Gram-reaction-variable, rod-shaped, motile, facultatively aerobic and endospore-forming bacterium, designated strain GSS02(T), was isolated from a forest soil. Strain GSS02(T) was capable of reducing humic substances and Fe(III) oxides. Strain GSS02(T) grew optimally at 35 °C, at pH 78 and in the presence of 1% NaCl. The predominant menaquinone was MK-7. The major cellular fatty acids were anteiso-C(15:0) and iso-C(16:0) and the polar lipid profile contained mainly phosphatidylethanolamine, diphosphatidylglycerol and phosphatidylglycerol, with moderate amounts of two unknown aminophospholipids and a minor amount of one unknown lipid. The DNA G+C content was 53.4 mol%. Comparative 16S rRNA gene sequence analysis showed that strain GSS02(T) was related most closely to Paenibacillus terrigena JCM 21741(T) (98.1% similarity). Mean DNA-DNA relatedness between strain GSS02(T) and P. terrigena JCM 21741(T) was 58.8 ± 0.5%. The phylogenetic, chemotaxonomic and phenotypic results clearly demonstrated that strain GSS02(T) belongs to the genus Paenibacillus and represents a novel species, for which the name Paenibacillus guangzhouensis sp. nov. is proposed. The type strain is GSS02(T) ( =KCTC 33171(T) =CCTCC AB 2013236(T)).

  11. Raman and histological study of the repair of surgical bone defects grafted with biphasic synthetic micro-granular HA + β- calcium triphosphate and irradiated or not with λ780 nm laser

    Science.gov (United States)

    Pinheiro, Antonio Luiz B.; Soares, Luiz Guilherme P.; Marques, Aparecida Maria C.; Aciole, Jouber Mateus S.; dos Santos, Jean N.; Silveira, Landulfo

    2014-02-01

    The treatment of bone loss due to different etiologic factors is difficult and many techniques aim to improve repair, including a wide range of biomaterials and, recently, phototherapies. This work assessed, by Raman spectroscopy and histology, the mineralization of bone defects. Forty rats divided into 4 groups each subdivided into 2 subgroups according to the time of sacrifice were used. Bone defects were made on the femur of each animal with a trephine drill. On animals of group Clot the defect was filled only by blood clot, on group Laser the defect filled with the clot was further irradiated. On animals of groups Biomaterial and Laser + Biomaterial the defect was filled by biomaterial and the last one was further irradiated (λ780 nm, 70 mW, Φ ~ 0.4 cm2, 20 J/cm2-session, 140 J/cm2-treatment). At both 15th and 30th days following sacrifice, samples were taken and analyzed by Raman spectroscopy and light microscopy. Raman peaks of inorganic and organic contents and a more advanced stage of repair were seen on group Laser + Biomaterial. It is concluded that the use of Laser phototherapy associated to biomaterial was effective to improve the repair of bone defects.

  12. Ablation of hard dental tissues with an ArF-pulsed excimer laser

    Science.gov (United States)

    Neev, Joseph; Raney, Daniel; Whalen, William E.; Fujishige, Jack T.; Ho, Peter D.; McGrann, John V.; Berns, Michael W.

    1991-06-01

    The interaction of 15 ns pulses from an ArF excimer laser with hard dental tissue was investigated for the purpose of obtaining practical information on the ablation process. Dark field fast photography utilizing an auxiliary, 15 ns Nd:Yag laser 'probe', was used to study the ablation plume dynamics as a function of time, luminescence were studied at different fluence levels and prr. Dentin ablation was found to be about four times as efficient as ablation of enamel in the higher fluence levels tested (> 10 J/cm2) and about twice as efficient as the ablation in the lower fluence regime (approximately equals 1 J/cm2). The dentin etch depth per pulse was found to increase exponentially with fluence (at least up to the tested level of 11 J/cm2), while in enamel the etch depth per pulse appears to increase logarithmically with fluence. Dentin ablation yields a larger, more dense plume which can be ejected (depending on the fluence level) to a height of several millimeters above the surface with observed ejection velocity in access of 1200 m/s. The dentin plume consisted of a relatively uniform particle size distribution (0.1 micrometers to 10 micrometers in diameter). Enamel ablation, on the other hand, yields a smaller observed ejection velocities (about 800 m/s), and a much smaller plume of fine particles (about 0.1 micrometers in diameter) and gases, confined to within 0.5 mm of the surface. In addition, an even smaller amount of highly non-uniform debris, (from ten to several hundred micrometers in size) is observed to be ejected to higher levels, and reach roughly half the height of the corresponding dentin plume for similar fluence levels. Although both dentin and enamel yield lower ablation efficiencies at 1 Hz, no significant difference is detected between the ablation efficiency at 5 Hz and ablation 10 Hz prr. Both materials remained within 20 degree(s)C of room temperature even at fluences as high as 20 J/cm2 and prr as high as 10 Hz for enamel and 20 Hz for

  13. Mitochondrial "movement" and lens optics following oxidative stress from UV-B irradiation: cultured bovine lenses and human retinal pigment epithelial cells (ARPE-19) as examples.

    Science.gov (United States)

    Bantseev, Vladimir; Youn, Hyun-Yi

    2006-12-01

    Mitochondria provide energy generated by oxidative phosphorylation and at the same time play a central role in apoptosis and aging. As a byproduct of respiration, the electron transport chain is known to be the major intracellular site for the generation of reactive oxygen species (ROS). Exposure to solar and occupational ultraviolet (UV) radiation, and thus production of ROS and subsequent cell death, has been implicated in a large spectrum of skin and ocular pathologies, including cataract. Retinal pigment epithelial cell apoptosis generates photoreceptor dysfunction and ultimately visual impairment. The purpose of this article was to characterize in vitro changes following oxidative stress with UV-B radiation in (a) ocular lens optics and cellular function in terms of mitochondrial dynamics of bovine lens epithelium and superficial cortical fiber cells and (b) human retinal pigment epithelial (ARPE-19) cells. Cultured bovine lenses and confluent cultures of ARPE-19 cells were irradiated with broadband UV-B radiation at energy levels of 0.5 and 1.0 J/cm(2). Lens optical function (spherical aberration) was monitored daily up to 14 days using an automated laser scanning system that was developed at the University of Waterloo. This system consists of a single collimated scanning helium-neon laser source that projects a thin (0.05 mm) laser beam onto a plain mirror mounted at 45 degrees on a carriage assembly. This mirror reflects the laser beam directly up through the scanner table surface and through the lens under examination. A digital camera captures the actual position and slope of the laser beam at each step. When all steps have been made, the captured data for each step position is used to calculate the back vertex distance for each position and the difference in that measurement between beams. To investigate mitochondrial movement, the mitochondria-specific fluorescent dye Rhodamine 123 was used. Time series were acquired with a Zeiss 510 (configuration Meta

  14. Effects of Er:YAG laser irradiation on the microtensile bond strength to bleached enamel.

    Science.gov (United States)

    Leonetti, Eduardo dos Santos; Rodrigues, José Augusto; Reis, André Figueiredo; Navarro, Ricardo Scarparo; Aranha, Ana Cecília Correa; Cassoni, Alessandra

    2011-08-01

    The objective of this study was to evaluate the influence of different Er:YAG laser (λ = 2.94  μm) energy parameters on the microtensile bond strength (μTBS) and superficial morphology of bovine enamel bleached with 16% carbamide peroxide. Laser irradiation could improve adhesion to bleached enamel surfaces. Sixty bovine enamel blocks (7 × 3 × 3  mm(3)) were randomly assigned to six groups according to enamel preparation procedures (n = 10): G1-bleaching and Er:YAG laser irradiation with 25.52  J/cm(2) (laser A, LA); G2-bleaching and Er:YAG laser irradiation with 4.42 J/cm(2) (laser B, LB); G3-bleaching; G4-Er:YAG laser irradiation with 25.52  J/cm(2); G5-Er:YAG laser irradiation with 4.42 J/cm(2); G6-control, no treatment. G1 to G3 were bleached for 6  h during 21 days. Afterwards, enamel surfaces in all groups were slightly abraded with 600-grit SiC papers and G1, G2, G4 and G5 were irradiated according to each protocol. Enamel blocks were then restored with an etch-and-rinse adhesive system and a 4-mm thick composite buildup was made in two increments (n = 9). After 24  h, restored blocks were serially sectioned with a cross-section area of ∼1  mm(2) at the bonded interface and tested in tension in a universal testing machine (1  mm/min). Failure mode was determined at a magnification of x100 using a stereomicroscope. One treated block of each group was selected for scanning electron microscopy (SEM) analysis. μTBS data were analyzed by two-way ANOVA and no statistical differences were observed among groups. Mean bond strengths (SD) in MPa were: G1-30.4(6.2); G2-27.9(8.5); G3-32.3(3.9); G4-23.7(5.8); G5-29.3(6.0); G6-29.1(6.1). A large number of adhesive failures was recorded for bleached and irradiated enamel surfaces. Bleached enamel surfaces μTBS values were not significantly different from those of unbleached enamel. Even though Er:YAG laser irradiation with both parameters had no influence on μTBS for bleached

  15. 氨基酮戊酸光动力疗法对铜绿假单胞菌的杀灭作用的体外研究%Photodynamic inactivation of pseudomonas aeruginosa by 5-aminolevulinic acid in vitro

    Institute of Scientific and Technical Information of China (English)

    成琼辉; 陈年; 欧东; 刘渤; 伍津津; 雷霞

    2014-01-01

    目的:研究氨基酮戊酸(5-aminolevulinic acid,5-ALA)光动力疗法(photodynamic therapy)(ALA-PDT)对铜绿假单胞菌的杀灭作用。方法:以铜绿假单胞菌标准菌株ATCC27853为研究对象,采用ALA为光敏剂,用630nm的红光为光源,按不同的浓度剂量组合分为6组,用细菌涂板法观察细菌浓度,同时利用氯仿萃取法测定照射后48小时的绿脓毒素;结果:仅有光敏剂实验组与对照组(无ALA,无红光)细菌量相比,对铜绿假单胞菌无杀灭作用,仅有红光照射(90J/cm2×40分钟)组有轻度杀菌作用,抑制率为18.9%,而ALA与红光组合的三个ALA-PDT实验组对铜绿假单胞菌均有不同程度的杀菌作用(10nM ALA+90J/cm2红光×20分钟组的抑制率为82.0%,20nM ALA+90J/cm2红光×20分钟组的抑制率为96.4%,而20nM ALA+90J/cm2红光×40分钟组抑制率为100%),ALA-PDT对铜绿假单胞菌的杀灭作用随ALA浓度增高和红光能量增高作用加强;绿脓毒素的量在光动力治疗组也有明显下降,随剂量增加明显下降。结论:ALA-PDT对体外培养的铜绿假单胞菌ATCC27853具有明确的杀灭作用,能减少绿脓毒素分泌,且与剂量相关。%Objective To investigate the effect of 5-aminolevulinic acid-based photodynamic therapy (ALA-PDT) on pseudomonas aeruginosa planktonic cells in vitro. Medhods: Pseudomonas aeruginosa standard strain ATCC27853 was used in this study. Pseudomonas aeruginosa was divided into 6 groups according to different dose of ALA and 630nm red light. Spread plate method was used to count the bacteria. The chloroform extraction method was used to detect the exotoxin of Pseudomonas aeruginosa. Results:Compared with blank group, the experimental group with only ALA had no effect to Pseudomonas aeruginosa. But, the experimental group with only red light has mild inhibition (18.9%) to Pseudomonas aeruginosa. Pseudomonas aeruginosa was inhibited in three

  16. The hypoalgesic effects of low-intensity infrared laser therapy: a study on 555 cases

    Science.gov (United States)

    Tam, Giuseppe

    2004-09-01

    Objective: Low energy lasers are widely used to treat a variety of musculoskeletal conditions. The aim of this clinical study is to determine the action of the IR diode laser 904 nm pulsed on pain reduction therapy. Summary Background Data: With respect to pain, has been shown the Low power density laser increases the endorphin synthesis in the dorsal posterior horn of the spinal cord stopping the production of bradykinin and serotonin. Besides laser causes local vasodilatation of the capillaries and an improved circulation of drainage liquids in interstitial space causing an analgesic effect. Additionally, laser interferes in the cytochines (TNF-α, interleukin-1 and interleukin-6) that drive inflammation in the arthritis and are secreted from CD4 e T cells. Methods: Treatment was carried out on 555 cases and 525 patients (322 women and 203 men) in the period between 1987 and 2002. The patients, whose age ranged from 25 to 70, with a mean age of 45 years, were suffering from rheumatic, degenerative and traumatic pathologies. The majority of the patients had been seen by orthopaedists and rheumatologists and had undergone x-ray, ultrasound scanning, Tac, RM examination. All patients had received drug-based treatment and/or physiotherapy with poor results. Two thirds were experiencing acute symptomatic pain, while the others presented a chronic pathology with recurrent crises. We used a pulsed IR diode laser, GaAs 904 nm, maximum power 60 W, frequency impulse 1300 Hz, pulsed duration 200 nanoseconds; peak power per pulse 27W; maximal energy density: 9J/cm2; total number of Joules per treatment session: 10-75J/cm2, chronic 12-90J/cm2. Average number of applications: 12; maximum number of applications: 20. Results: In the evaluation of the results the following parameters have been considered: disappearance of spontaneous and induced pain (Likert scale, Rolland Morris disability scale, dynamometer). The pathologies treated were osteoarthritis in general, epicondylitis

  17. Effect of polychromatic visible light on proliferation of tumor cells under conditions in vitro and in vivo—after implantation to experimental animals

    Science.gov (United States)

    Knyazev, N. A.; Samoilova, K. A.; Filatova, N. A.; Galaktionova, A. A.

    2009-06-01

    The question of the character of effect of visible and near infrared (IR) radiation of Sun and artificial sources on growth of malignant tumors remains open due to controversy and a relatively small amount of available data, which restricts use of this most important environmental and the efficient physiotherapeutic factors at various human pathological states and first of all at the rehabilitation of oncological patients after radical methods of cancer treatment (surgical removal of tumor, intensive medication and radiation therapy), when immunomodulatory antiinflamatory, wound-healing and analgesic properties of visible and near IR light can be drawn. In the present work, using polychromatic visible light, close to this dominant component of the terrestrial solar radiation (380-750 nm, 40 mW/cm2) we irradiated tumor cells of the murine hepatoma (MH-22a line) under conditions in vitro (the monolayer of cells in Petri dishes) and in vivo (after subcutaneous implantation of these cells to mice of the C3HA line). A high resistance of the MH-22a cells to polychromatic visible radiation has been established under conditions in vitro: irradiation at dose 24 J/cm2 did not inhibit their proliferation whereas a dose of 9.6 J/cm2, stimulated statistically significantly proliferation of the cells (by 24-40%). However, stimulation of the tumor cell proliferation, did not develop under conditions in vivo, when mice were irradiated (9.6 J/cm2)—daily for 5 days before the implantation of tumor cells and for 5 days after implantation (in the latter case there was a probability of transcutaneous irradiation of tumor cells). By implanting to the animals of tumor cells at various concentrations (from 2ṡ105 to 25ṡ103 cells per mouse), we did not revealed at any of 10 terms of observations for 41-45 days both an increase of incidence of the tumor development and acceleration of tumor growth as well as a decrease of the animals survival as compared with group of non

  18. 烟酰胺对长波紫外线照射黑素细胞黑素合成的干预%Intervention of nicotinamide on skin melanin genesis after UVA exposed

    Institute of Scientific and Technical Information of China (English)

    帕它木·莫合买提; 金锡鹏; 张玉彬; 潘建英; 沈光祖

    2007-01-01

    目的 研究烟酰胺对长波紫外线(UVA)致人皮肤黑素细胞黑素合成的干预作用.方法 观察0.2 J/cm2 UVA(365 nm)照射人皮肤黑素细胞后,烟酰胺在不同剂量时对人皮肤黑素细胞中黑素合成和转运的干预作用.结果 0.2J/cm2 UVA照射后,黑素细胞中黑素含量明显增加,UVA照射后的人皮肤黑素细胞给予不同剂量的烟酰胺时,黑素细胞中黑素含量明显下降,10.0 mmol/ml时作用更为明显.烟酰胺在有效抑制黑素含量的同时,对黑素细胞的细胞周期、细胞凋亡及DNA指数无明显影响;0.2 J/cm2UVA照射后立即给予烟酰胺时,烟酰胺可以调节黑素细胞中mRNA的表达水平.结论 烟酰胺能够拮抗UVA的致黑作用;10.0mmol/ml烟酰胺在干预UVA所致的黑素细胞致黑作用的同时,对黑素细胞的作用浓度是安全的;烟酰胺参与其中黑素的转运;鉴于烟酰胺拮抗UVA致黑作用的有效结果,烟酰胺有望用于防护UVA照射所引起的晒黑作用.

  19. Photothermal killing of Staphylococcus aureus using antibody-targeted gold nanoparticles

    Directory of Open Access Journals (Sweden)

    Millenbaugh NJ

    2015-03-01

    Full Text Available Nancy J Millenbaugh,1 Jonathan B Baskin,1 Mauris N DeSilva,1 W Rowe Elliott,1 Randolph D Glickman2 1Maxillofacial Injury and Disease Department, Naval Medical Research Unit San Antonio, Joint Base San Antonio-Fort Sam Houston, TX, USA; 2Department of Ophthalmology, The University of Texas Health Science Center at San Antonio, San Antonio, TX, USAPurpose: The continued emergence of multidrug resistant bacterial infections and the decline in discovery of new antibiotics are major challenges for health care throughout the world. This situation has heightened the need for novel antimicrobial therapies as alternatives to traditional antibiotics. The combination of metallic nanoparticles and laser exposure has been proposed as a strategy to induce physical damage to bacteria, regardless of antibiotic sensitivity. The purpose of this study was to test the antibacterial effect of antibody-targeted gold nanoparticles combined with pulsed laser irradiation.Methods: Gold nanoparticles conjugated to antibodies specific to Staphylococcus aureus peptidoglycan were incubated with suspensions of methicillin-resistant and methicillin-sensitive S. aureus (MRSA and MSSA. Bacterial suspensions were then exposed to 8 ns pulsed laser irradiation at a wavelength of 532 nm and fluences ranging from 1 to 5 J/cm2. Viability of the bacteria following laser exposure was determined using colony forming unit assays. Scanning electron microscopy was used to confirm the binding of nanoparticles to bacteria and the presence of cellular damage.Results: The laser-activated nanoparticle treatment reduced the surviving population to 31% of control in the MSSA population, while the survival in the MRSA population was reduced to 58% of control. Significant decreases in bacterial viability occurred when the laser fluence exceeded 1 J/cm2, and this effect was linear from 0 to 5 J/cm2 (r2=0.97. Significantly less bactericidal effect was observed for nonfunctionalized nanoparticles or

  20. Assessment of the effects of laser photobiomodulation on peri-implant bone repair through energy dispersive x-ray fluorescence: A study of dogs

    Science.gov (United States)

    Menezes, R. F.; Araújo, N. C.; Carneiro, V. S. M.; Moreno, L. M.; Guerra, L. A. P.; Santos Neto, A. P.; Gerbi, M. E. M.

    2016-03-01

    Bone neoformation is essential in the osteointegration of implants and has been correlated with the repair capacity of tissues, the blood supply and the function of the cells involved. Laser therapy accelerates the mechanical imbrication of peri-implant tissue by increasing osteoblastic activity and inducing ATP, osteopontin and the expression of sialoproteins. Objective: The aim of the present study was to assess peri-implant bone repair using the tibia of dogs that received dental implants and laser irradiation (AsGaAl 830nm - 40mW, CW, f~0.3mm) through Energy Dispersive X-ray Fluorescence (EDXRF). Methodology: Two groups were established: G1 (Control, n=20; two dental implants were made in the tibia of each animal; 10 animals); G2 (Experimental, n=20, two dental implants were made in the tibia each animal + Laser therapy; 10 animals). G2 was irradiated every 48 hours for two weeks, with a total of seven sessions. The first irradiation was conducted during the surgery, at which time a point in the surgical alveolus was irradiated prior to the placement of the implant and four new spatial positions were created to the North, South, East and West (NSEW) of the implant. The subsequent sessions involved irradiation at these four points and at one infra-implant point (in the direction of the implant apex). Each point received 4J/cm2 and a total dose of 20J/cm2 per session (treatment dose=140J/cm2). The specimens were removed 15 and 30 days after the operation for the EDXRF test. The Mann- Whitney statistical test was used to assess the results. Results: The increase in the calcium concentration in the periimplant region of the irradiated specimens (G2) was statistically significant (p < 0.05), when compared with the control group (G1). Conclusion: The results of the present study show that irradiation with the AsGaAl laser promoted an acceleration in bone repair in the peri-implant region.