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Sample records for human pons medulla

  1. Acetylcholinesterase activity in the pons and medulla oblongata of rats after chronic electroconvulsive shock

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    Camarini R.

    1997-01-01

    Full Text Available An imbalance between cholinergic and noradrenergic neurotransmission has been proposed for the etiology of affective disorders. According to this hypothesis, depression would be the result of enhanced cholinergic and reduced noradrenergic neurotransmission. Repeated electroconvulsive shock (ECS is an effective treatment for depression; moreover, in laboratory animals it induces changes in brain noradrenergic neurotransmission similar to those obtained by chronic treatment with antidepressant drugs (down-regulation of beta-adrenergic receptors. The aim of the present study was to determine whether repeated ECS in rats changes acetylcholinesterase (Achase activity. Achase controls the level of acetylcholine (Ach in the synaptic cleft and its levels seem to be regulated by the interaction between Ach and its receptor. Thus, a decrease in Achase activity would suggest decreased cholinergic activity. Adult male Wistar rats received one ECS (80 mA, 0.2 s, 60 Hz daily for 7 days. Control rats were handled in the same way without receiving the shock. Rats were sacrificed 24 h after the last ECS and membrane-bound and soluble Achase activity was assayed in homogenates obtained from the pons and medulla oblongata. A statistically significant decrease in membrane-bound Achase activity (nmol thiocholine formed min-1 mg protein-1 (control 182.6 ± 14.8, ECS 162.2 ± 14.2, P<0.05 and an increase in soluble Achase activity in the medulla oblongata (control 133.6 ± 4.2, ECS 145.8 ± 12.3, P<0.05 were observed. No statistical differences were observed in Achase activity in the pons. Although repeated ECS induced a decrease in membrane-bound Achase activity, the lack of changes in the pons (control Achase activity: total 231.0 ± 34.5, membrane-bound 298.9 ± 18.5, soluble 203.9 ± 30.9, the region where the locus coeruleus, the main noradrenergic nucleus, is located, does not seem to favor the existence of an interaction between cholinergic and noradrenergic

  2. Inhibition of Pseudomonas aeruginosa biofilm formation and motilities by human serum paraoxonase (hPON1

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    Aynur Aybey

    2016-10-01

    Full Text Available Human serum paraoxonase 1 (hPON1 which hydrolyzes Pseudomonas aeruginosa acyl homoserine lactone (AHL signal molecules was used as antibiofilm agent. hPON1 was purified by using ammonium sulfate precipitation and specially designed hydrophobic interaction chromatography (Sepharose 4B-L-tyrosine-1-Naphthylamine from the fresh human serum. As cell motility of swarming, swimming and twitching are proven instrumental in biofilm formation, we investigated whether or not hPON1 affected the P. aeruginosa motility. hPON1 was reduced the early stage of biofilm formation, mature biofilm and motilities. The early stage and old biofilm were decreased more than 50% by 1 mg ml–1 of hPON1 concentration within range of 0.1–10 mg ml–1. Additionally, exopolymeric substance (EPS of mature biofilm was indirectly decreased by hPON1. Inhibitory effect of hPON1 within range of 0.003–30 mg ml–1 on swarming and swimming motilities. But it resulted in highly inhibitory effects on twitching motility at concentration as low as 0.3 mg ml–1 concentration. This study proved that hPON1 alone can be safely used to inhibit/disrupt the mature biofilms and cell motility of P. aeruginosa and beholds much promise in clinical applications.

  3. Human plasma paraoxonase 1 (PON1) arylesterase activity during aging: correlation with susceptibility of LDL oxidation.

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    Mehdi, Mohammad Murtaza; Rizvi, Syed Ibrahim

    2012-08-01

    The role of free radicals has long been proposed as a cause for the aging process. Oxidative stress is considered a major factor for altering many physiological processes and enzymatic activities during aging and is also known to play a major role in the development of several age-dependent diseases. Paraoxonase 1 (PON1) is an anti-atherosclerotic enzyme that mainly prevents accumulation of lipoperoxides and inhibits the lipid oxidation in low-density lipoproteins (LDL). This study was undertaken to investigate the antioxidant behavior of PON1 by measuring its arylesterase activity. The susceptibility of LDL for oxidation and the radical scavenging activity of plasma were also measured during aging in humans. Arylesterase activity of PON1 was measured in plasma of human subjects between 20 and 81 years of age of both genders. The susceptibility of LDL for oxidation and radical scavenging activity were measured in plasma. Decrease in plasma arylesterase activity of PON1, increase in susceptibility of LDL for oxidation and decrease in plasma radical scavenging activity were observed as a function of human age. The study provides evidence of a relationship between PON1 activity, LDL oxidation and free radical scavenging activity of plasma. The present results emphasize the dependency of PON1 activity to prevailing oxidative stress during human aging. Our findings assume significance in view of the possible categorization of PON1 as a longevity gene. Copyright © 2012 IMSS. Published by Elsevier Inc. All rights reserved.

  4. Optical properties of the medulla and the cortex of human scalp hair

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    Kharin, Aleksey; Varghese, Babu; Verhagen, Rieko; Uzunbajakava, Natallia

    2009-03-01

    An increasing number of applications, including non- or minimally invasive diagnostics and treatment as well as various cosmetic procedures, has resulted in a need to determine the optical properties of hair and its structures. We report on the measurement of the total attenuation coefficient of the cortex and the medulla of blond, gray, and Asian black human scalp hair at a 633-nm wavelength. Our results show that for blond and gray hair the total attenuation coefficient of the medulla is more than 200 times higher compared to that of the cortex. This difference is only 1.5 times for Asian black hair. Furthermore, we present the total attenuation coefficient of the cortex of blond, gray, light brown, and Asian black hair measured at wavelengths of 409, 532, 633, 800, and 1064 nm. The total attenuation coefficient consistently decreases with an increase in wavelength, as well as with a decrease in hair pigmentation. Additionally, we demonstrate the dependence of the total attenuation coefficient of the cortex and the medulla of Asian black hair on the polarization of incident light. A similar dependence is observed for the cortex of blond and gray hair but not for the medulla of these hair types.

  5. Comparison of in vitro- and chorioallantoic membrane (CAM)-culture systems for cryopreserved medulla-contained human ovarian tissue.

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    Isachenko, Vladimir; Mallmann, Peter; Petrunkina, Anna M; Rahimi, Gohar; Nawroth, Frank; Hancke, Katharina; Felberbaum, Ricardo; Genze, Felicitas; Damjanoski, Ilija; Isachenko, Evgenia

    2012-01-01

    At present, there are three ways to determine effectively the quality of the cryopreservation procedure using ovarian tissue before the re-implantation treatment: evaluation of follicles after post-thawing xenotransplantation to SCID mouse, in-vitro culture in a large volume of culture medium under constant agitation and culture on embryonic chorio-allantoic membrane within a hen's eggs. The aim of this study was to compare the two methods, culture in vitro and culture on embryonic chorioallantoic membrane (CAM) of cryopreserved human ovarian medulla-contained and medulla-free cortex. Ovarian fragments were divided into small pieces (1.5-2.0×1.0-1.2×0.8-1.5) of two types, cortex with medulla and medulla-free cortex, frozen, thawed and randomly divided into the following four groups. Group 1: medulla-free cortex cultured in vitro for 8 days in large volume of medium with mechanical agitation, Group 2: medulla-containing cortex cultured in vitro, Group 3: medulla-free cortex cultured in CAM-system for 5 days, Group 4: medulla-containing cortex cultured in CAM-system. The efficacy of the tissue culture was evaluated by the development of follicles and by intensiveness of angiogenesis in the tissue (von Willebrand factor and Desmin). For Group 1, 2, 3 and 4, respectively 85%, 85%, 87% and 84% of the follicles were morphologically normal (P>0.1). The immunohistochemical analysis showed that angiogenesis detected by von Willebrand factor was lower in groups 1 and 3 (medulla-free cortex). Neo-vascularisation (by Desmin) was observed only in ovarian tissue of Group 4 (medulla-contained cortex after CAM-culture). It appears that the presence of medulla in ovarian pieces is beneficial for post-thaw development of cryopreserved human ovarian tissue. For medical practice it is recommended for evaluation of post-warming ovarian tissue to use the CAM-system as a valuable alternative to xenotransplantation and for cryopreservation of these tissues to prepare ovarian medulla

  6. The serotonergic anatomy of the developing human medulla oblongata: implications for pediatric disorders of homeostasis.

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    Kinney, Hannah C; Broadbelt, Kevin G; Haynes, Robin L; Rognum, Ingvar J; Paterson, David S

    2011-07-01

    The caudal serotonergic (5-HT) system is a critical component of a medullary "homeostatic network" that regulates protective responses to metabolic stressors such as hypoxia, hypercapnia, and hyperthermia. We define anatomically the caudal 5-HT system in the human medulla as 5-HT neuronal cell bodies located in the raphé (raphé obscurus, raphé magnus, and raphé pallidus), extra-raphé (gigantocellularis, paragigantocellularis lateralis, intermediate reticular zone, lateral reticular nucleus, and nucleus subtrigeminalis), and ventral surface (arcuate nucleus). These 5-HT neurons are adjacent to all of the respiratory- and autonomic-related nuclei in the medulla where they are positioned to modulate directly the responses of these effector nuclei. In the following review, we highlight the topography and development of the caudal 5-HT system in the human fetus and infant, and its inter-relationships with nicotinic, GABAergic, and cytokine receptors. We also summarize pediatric disorders in early life which we term "developmental serotonopathies" of the caudal (as well as rostral) 5-HT domain and which are associated with homeostatic imbalances. The delineation of the development and organization of the human caudal 5-HT system provides the critical foundation for the neuropathologic elucidation of its disorders directly in the human brain. Copyright © 2011 Elsevier B.V. All rights reserved.

  7. No or only population-specific effect of PON1 on human longevity: A comprehensive meta-analysis

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    Caliebe, Amke; Kleindorp, Rabea; Blanché, Hélène

    2010-01-01

    Paraoxonase 1 (PON1) has been suggested as a plausible candidate gene for human longevity due to its modulation of cardiovascular disease risk, by preventing oxidation of atherogenic low-density lipoprotein. The role of the PON1 192 Q/R polymorphism has been analyzed for association with survival...... comprehensive meta-analysis on PON1 192 Q/R and longevity to-date, to include a total of 9580 individuals. No significant association of PON1 192 Q/R with longevity was observed, for either R allele or carriership. This finding relied on very large sample sizes, is supported by different analysis methods...... and is therefore considered very robust. Moreover, we have investigated a potential interaction of PON1 192 Q/R with APOE varepsilon4 using data from four populations. Whereas a significant result was found in the German sample, this could not be confirmed in the other examined groups. Our large-scale meta...

  8. Stereospecific hydrolysis of a phosphoramidate used as an OPIDP model by human sera with PON1 192 alloforms.

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    Monroy-Noyola, Antonio; Trujillo, Bertín; Yescas, Petra; Martínez-Salazar, Fernanda; García-Jiménez, Sara; Ríos, Camilo; Vilanova, Eugenio

    2015-10-01

    O-hexyl 2,5-dichlorophenyl phosphoramidate (HDCP) is a racemic organophosphate compound (OP) that induces delayed neuropathy in vivo. The O-hexyl 2,5-dichlorophenyl phosphoramidate R (R-HDCP) isomer inhibits and ages neuropathic target esterase (NTE) in hen brain. Moreover, human serum paraoxonase-1 (PON1) is a Ca(2+)-dependent enzyme capable of hydrolyzing OPs. The enzymatic activity of PON1 against OPs depends on the genetic polymorphisms present at position 192 (glutamine or arginine). The catalytic efficiency of PON1 is an important factor that determines neurotoxic susceptibility to some OPs. In the present study, we characterized the stereospecific hydrolysis of HDCP by alloforms PON1 Q192R human serum by chiral chromatography. Forty-seven human samples were characterized for the PON1 192 polymorphism. The hydrolysis data demonstrate that the three alloforms of PON1 show an exclusive and significant stereospecific Ca(2+)-dependent hydrolysis of O-hexyl 2,5-dichlorophenyl phosphoramidate S isomer (S-HDCP) at 19-127 µM at the concentrations that remain in all the samples. This stereoselective Ca(2+)-dependent hydrolysis of S-HDCP is inhibited by EDTA and is independent of the PON1 Q192R alloform. The present research reinforces the hypothesis that R-HDCP (an isomer that inhibits and causes NTE aging) is the enantiomer that induces delayed neuropathy by this chiral phosphoramidate due to the low hydrolysis level of the R-HDCP observed in this study.

  9. Neuropeptide S- and Neuropeptide S receptor-expressing neuron populations in the human pons.

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    Adori, Csaba; Barde, Swapnali; Bogdanovic, Nenad; Uhlén, Mathias; Reinscheid, Rainer R; Kovacs, Gabor G; Hökfelt, Tomas

    2015-01-01

    Neuropeptide S (NPS) is a regulatory peptide with potent pharmacological effects. In rodents, NPS is expressed in a few pontine cell clusters. Its receptor (NPSR1) is, however, widely distributed in the brain. The anxiolytic and arousal-promoting effects of NPS make the NPS-NPSR1 system an interesting potential drug target in mood-related disorders. However, so far possible disease-related mechanisms involving NPS have only been studied in rodents. To validate the relevance of these animal studies for i.a. drug development, we have explored the distribution of NPS-expressing neurons in the human pons using in situ hybridization and stereological methods and we compared the distribution of NPS mRNA expressing neurons in the human and rat brain. The calculation revealed a total number of 22,317 ± 2411 NPS mRNA-positive neurons in human, bilaterally. The majority of cells (84%) were located in the parabrachial area in human: in the extension of the medial and lateral parabrachial nuclei, in the Kölliker-Fuse nucleus and around the adjacent lateral lemniscus. In human, in sharp contrast to the rodents, only very few NPS-positive cells (5%) were found close to the locus coeruleus. In addition, we identified a smaller cell cluster (11% of all NPS cells) in the pontine central gray matter both in human and rat, which has not been described previously even in rodents. We also examined the distribution of NPSR1 mRNA-expressing neurons in the human pons. These cells were mainly located in the rostral laterodorsal tegmental nucleus, the cuneiform nucleus, the microcellular tegmental nucleus region and in the periaqueductal gray. Our results show that both NPS and NPSR1 in the human pons are preferentially localized in regions of importance for integration of visceral autonomic information and emotional behavior. The reported interspecies differences must, however, be considered when looking for targets for new pharmacotherapeutical interventions.

  10. Toxicity of chlorpyrifos and chlorpyrifos oxon in a transgenic mouse model of the human paraoxonase (PON1) Q192R polymorphism

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    Cole, Toby B.; Walter, Betsy J.; Shih, Diana M.; Tward, Aaron D.; Lusis, Aldons J.; Timchalk, Chuck; Richter, Rebecca J.; Costa, Lucio G.; Furlong, Clement E.

    2005-08-01

    The Q192R polymorphism of paraoxonase (PON1) has been shown to affect hydrolysis of organophosphorus compounds. The Q192 and R192 alloforms exhibit equivalent catalytic efficiencies of hydrolysis for diazoxon, the oxon form of the pesticide (DZ). However, the R192 alloform has a higher catalytic efficiency of hydrolysis than does the Q192 alloform for chlorpyrifos oxon (CPO), the oxon form of the pesticide chlorpyrifos (CPS). The current study examined the relevance of these observations for in-vivo exposures to chlorpyrifos and chlorpyrifos oxon. Methods Using a transgenic mouse model we examined the relevance of the Q192R polymorphism for exposure to CPS and CPO in vivo. Transgenic mice were generated that expressed either human PON1Q192 or PON1R192 at equivalent levels, in the absence of endogenous mouse PON1. Dose-response and time course experiments were performed on adult mice exposed dermally to CPS or CPO. Morbidity and acetylcholinesterase (AChE) activity in the brain and diaphragm were determined in the first 24 h following exposure. Results Mice expressing PON1Q192 were significantly more sensitive to CPO, and to a lesser extent CPS, than were mice expressing PON1R192. The time course of inhibition following exposure to 1.2 mg/kg CPO revealed maximum inhibition of brain AChE at 6?12 h, with PON1R192, PON1Q192, and PON1? /? mice exhibiting 40, 70 and 85% inhibition, respectively, relative to control mice. The effect of PON1 removal on the dose?response curve for CPS exposure was remarkably consistent with a PBPK/PD model of CPS exposure. Conclusion These results indicate that individuals expressing only the PON1Q192 allele would be more sensitive to the adverse effects of CPO or CPS exposure, especially if they are expressing a low level of plasma PON1Q192.

  11. Novel nucleophiles enhance the human serum paraoxonase 1 (PON1)-mediated detoxication of organophosphates.

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    Chambers, Janice E; Chambers, Howard W; Meek, Edward C; Funck, Kristen E; Bhavaraju, Manikanthan H; Gwaltney, Steven R; Pringle, Ronald B

    2015-01-01

    Paraoxonase 1 (PON1) is a calcium-dependent hydrolase associated with serum high-density lipoprotein particles. PON1 hydrolyzes some organophosphates (OPs), including some nerve agents, through nucleophilic attack of hydroxide ion (from water) in the active site. Most OPs are hydrolyzed inefficiently. This project seeks to identify nucleophiles that can enhance PON1-mediated OP degradation. A series of novel nucleophiles, substituted phenoxyalkyl pyridinium oximes, has been synthesized which enhance the degradation of surrogates of sarin (nitrophenyl isopropyl methylphosphonate; NIMP) and VX (nitrophenyl ethyl methylphosphonate; NEMP). Two types of in vitro assays have been conducted, a direct assay using millimolar concentrations of substrate with direct spectrophotometric quantitation of a hydrolysis product (4-nitrophenol) and an indirect assay using submicromolar concentrations of substrate with quantitation by the level of inhibition of an exogenous source of acetylcholinesterase from non-hydrolyzed substrate. Neither NIMP nor NEMP is hydrolyzed effectively by PON1 if one of these novel oximes is absent. However, in the presence of eight novel oximes, PON1-mediated degradation of both surrogates occurs. Computational modeling has created a model of PON1 embedded in phospholipid and has indicated general agreement of the binding enthalpies with the relative efficacy as PON1 enhancers. PON1 enhancement of degradation of OPs could be a unique and unprecedented mechanism of antidotal action. © The Author 2014. Published by Oxford University Press on behalf of the Society of Toxicology.All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com.

  12. Paraoxonase (PON1 and PON3 polymorphisms: impact on liver expression and atorvastatin-lactone hydrolysis

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    Stephan eRiedmaier

    2011-07-01

    Full Text Available Atorvastatin δ-lactone, a major, pharmacologically inactive metabolite, has been associated with toxicity. In a previous study we showed that polymorphisms of UGT1A3 influence atorvastatin δ-lactone formation. Here we investigated the reverse reaction, atorvastatin δ-lactone hydrolysis, in a human liver bank. Screening of microarray data revealed paraoxonases PON1 and PON3 among 17 candidate esterases. Microsomal δ-lactone hydrolysis was significantly correlated to PON1 and PON3 protein (rs=0.60; rs=0.62, respectively; P<0.0001. PON1 and PON3 were strongly correlated to each other (rs=0.60 but PON1 was shown to be more extensively glycosylated than PON3. In addition a novel splice variant of PON3 was identified. Genotyping of 40 polymorphisms within the PON-locus identified PON1 promoter polymorphisms (-108T>C, -832G>A, -1741G>A and a tightly linked group of PON3 polymorphisms (-4984A>G, -4105G>A, -1091A>G, -746C>T and F21F to be associated with changes in atorvastatin δ-lactone hydrolysis and expression of PON1 but not PON3. However, carriers of the common PON1 polymorphisms L55M or Q192R showed no difference in δ-lactone hydrolysis or PON expression. Haplotype analysis revealed decreased δ-lactone hydrolysis in carriers of the most common haplotype *1 compared to carriers of haplotypes *2, *3, *4 and *7. Analysis of non-genetic factors showed association of hepatocellular and cholangiocellular carcinoma with decreased PON1 and PON3 expression, respectively. Increased C-reactive protein and γ-glutamyl transferase levels were associated with decreased protein expression of both enzymes, and increased bilirubin levels, cholestasis and pre-surgical exposure to omeprazole or pantoprazole were related to decreased PON3 protein. In conclusion, PON-locus polymorphisms affect PON1 expression whereas non-genetic factors have an effect on PON1 and PON3 expression. This may influence response to therapy or adverse events in statin treatment.

  13. Next generation PON evolution

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    Srivastava, Anand

    2013-01-01

    Passive optical network (PON) features a point-to-multi-point (P2MP) architecture to provide broadband access. The P2MP architecture has become the most popular solution for FTTx deployment among operators. PON-based FTTx has been widely deployed ever since 2004 when ITU-T Study Group 15Q2 completed recommendations that defined GPON system [ITU-T seriesG.984]. As full services are provisioned by the massive deployment of PON networks worldwide, operators expect more from PONs. These include improved bandwidths and service support capabilities as well as enhanced performance of access nodes and supportive equipment over their existing PON networks. The direction of PON evolution is a key issue for the telecom industry. Full Service Access Network (FSAN) and ITU-T are the PON interest group and standard organization, respectively. In their view, the next-generation PONs are divided into two phases: NG-PON1 and NG-PON2. Mid-term upgrades in PON networks are defined as NG-PON1, while NG-PON2 is a long-term solution in PON evolution. Major requirements of NG-PON1 are the coexistence with the deployed GPON systems and the reuse of outside plant. Optical Distribution Networks (ODNs) account for 70% of the total investments in deploying PONs. Therefore, it is crucial for the NGPON evolution to be compatible with the deployed networks. With the specification of system coexistence and ODN reuse, the only hold-up of the migration from GPON to NG-PON1 is the maturity of the industry chain. Unlike NG-PON1 that has clear goals and emerging developments, there are many candidate technologies for NG-PON2. The selection of NG-PON2 is under discussion. However, one thing is clear, NG-PON2 technology must outperform NG-PON1 technologies in terms of ODN compatibility, bandwidth, capacity, and cost-efficiency.

  14. Control of REM sleep by ventral medulla GABAergic neurons.

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    Weber, Franz; Chung, Shinjae; Beier, Kevin T; Xu, Min; Luo, Liqun; Dan, Yang

    2015-10-15

    Rapid eye movement (REM) sleep is a distinct brain state characterized by activated electroencephalogram and complete skeletal muscle paralysis, and is associated with vivid dreams. Transection studies by Jouvet first demonstrated that the brainstem is both necessary and sufficient for REM sleep generation, and the neural circuits in the pons have since been studied extensively. The medulla also contains neurons that are active during REM sleep, but whether they play a causal role in REM sleep generation remains unclear. Here we show that a GABAergic (γ-aminobutyric-acid-releasing) pathway originating from the ventral medulla powerfully promotes REM sleep in mice. Optogenetic activation of ventral medulla GABAergic neurons rapidly and reliably initiated REM sleep episodes and prolonged their durations, whereas inactivating these neurons had the opposite effects. Optrode recordings from channelrhodopsin-2-tagged ventral medulla GABAergic neurons showed that they were most active during REM sleep (REMmax), and during wakefulness they were preferentially active during eating and grooming. Furthermore, dual retrograde tracing showed that the rostral projections to the pons and midbrain and caudal projections to the spinal cord originate from separate ventral medulla neuron populations. Activating the rostral GABAergic projections was sufficient for both the induction and maintenance of REM sleep, which are probably mediated in part by inhibition of REM-suppressing GABAergic neurons in the ventrolateral periaqueductal grey. These results identify a key component of the pontomedullary network controlling REM sleep. The capability to induce REM sleep on command may offer a powerful tool for investigating its functions.

  15. Survival and growth of isolated pre-antral follicles from human ovarian medulla tissue during long-term 3D culture

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    Yin, H L; Kristensen, S G; Jiang, H

    2016-01-01

    STUDY QUESTION: Can human pre-antral follicles isolated enzymatically from surplus medulla tissue survive and grow in vitro during long-term 3D culture? SUMMARY ANSWER: Secondary human follicles can develop to small antral follicles and remain hormonally active in an alginate-encapsulation culture...... during long-term culture has received only little attention. STUDY DESIGN, SIZE, DURATION: Two to ten human pre-antral follicles were encapsulated together within an alginate bead and cultured with or without ovarian interstitial tissue for either 7 days or >30 days. Follicles were cultured in either 20......% oxygen or 5% oxygen or encapsulated in a lower concentration of alginate together with a lower concentration of FSH in high oxygen. PARTICIPANTS/MATERIALS, SETTING, METHODS: A total of 395 pre-antral follicles from 16 cancer patients, aged 9-37 years, were co-cultured for either 7 days or >30 days...

  16. Surgical treatment of intramedullary tumors (spinal cord and medulla oblongata). Analysis of 16 cases.

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    Ahyai, A; Woerner, U; Markakis, E

    1990-01-01

    From February 1987 to July 1988, 16 patients of our clinic with intramedullary tumors (seven astrocytomas, six ependymomas, two angiomas with intramedullary hematomyelia, and one angioblastoma of the medulla oblongata) underwent surgery. Radical excision was possible in six cases with tumors in the cervical and/or thoracic region as well as in two cases with tumors in the medulla oblongata. In the group of patients with cervical and/or thoracic tumors, seven showed improvement, up to complete remission of the neurological symptoms. From eight patients with tumors of the medulla oblongata, one patient showed an invasive tumor of the medulla oblongata and pons with corresponding extensive neurological deficits, and died six weeks after surgery. The neurologic symptoms of the other seven patients improved after a postoperative interval of at least six weeks. The surgical approach to tumors of the medulla oblongata or spinal cord was performed by midline incision. Occasionally, a dorsal root entry zone (DREZ) incision was used when the tumor showed strictly unilateral localization. Tumors of the rhomboid fossa were approached by a lateral incision to avoid damage to nuclear structures. The more rostral the tumor localization (medulla oblongata, pons), the less complete was the surgery: only one ependymoma of the medulla oblongata was accessible to total extirpation. The tumor dignity worsened with ascending level of tumor localization. As described generally in the literature, neurological deficits of those patients with tumors in the medulla oblongata increased in the first few postoperative weeks before they began to improve. Chemotherapy, radiation therapy or decompressive laminectomy by themselves only lead to an improvement and are, therefore, not recommended.

  17. Survival and growth of isolated pre-antral follicles from human ovarian medulla tissue during long-term 3D culture.

    Science.gov (United States)

    Yin, H; Kristensen, S G; Jiang, H; Rasmussen, A; Andersen, C Yding

    2016-07-01

    Can human pre-antral follicles isolated enzymatically from surplus medulla tissue survive and grow in vitro during long-term 3D culture? Secondary human follicles can develop to small antral follicles and remain hormonally active in an alginate-encapsulation culture system for more than 30 days. Ovarian tissue cryopreservation followed by transplantation is a promising fertility preservation approach for cancer patients. However, transplantation of cryopreserved tissue to patients may carry the risk of re-implanting malignant cells. Grafting of follicles enzymatically isolated from ovarian tissue or developing a method for follicular culture and maturation in vitro may provide fertility to such patients without the risk of reintroducing the malignancy. However, the growth of pre-antral follicles isolated by enzymatic digestion from medulla tissue during long-term culture has received only little attention. Two to ten human pre-antral follicles were encapsulated together within an alginate bead and cultured with or without ovarian interstitial tissue for either 7 days or >30 days. Follicles were cultured in either 20% oxygen or 5% oxygen or encapsulated in a lower concentration of alginate together with a lower concentration of FSH in high oxygen. A total of 395 pre-antral follicles from 16 cancer patients, aged 9-37 years, were co-cultured for either 7 days or >30 days. A proportion of follicle (64) were removed from culture on Day 7 and assessed for viability using confocal fluorescence microscopy following calcein-AM and ethidium homodimer-1 staining or histology. The remaining follicles (331) were continued in culture for >30 days then assessed for survival and growth. Anti-Müllerian hormone (AMH) and estradiol levels were quantified in the medium. An optimized protocol for isolation of intact healthy pre-antral follicles from ovarian medulla was developed. After 7 days of culture, secondary follicles had a significantly higher survival rates compared with

  18. Paraoxonase 1 (PON1) inhibits monocyte-to-macrophage differentiation.

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    Rosenblat, Mira; Volkova, Nina; Ward, John; Aviram, Michael

    2011-11-01

    To analyze paraoxonase 1 (PON1) effect on monocyte-to-macrophage differentiation. THP-1 monocytic cell-line and mouse peritoneal macrophages (MPM) were studied. Markers for monocytes differentiation included: morphological changes, CD11b and CD36 expression, and cellular oxidative stress. PON1KO MPM were more differentiated than control C57BL/6 MPM. Intraperitoneal injection of recombinant PON1 (rePON1) to C57BL/6 or to PON1KO mice significantly increased serum, MPM, and tissues PON1 activities. These effects were associated with a significant decrease in CD11b in C57BL/6 and PON1KO MPM (by 21% and 35%, respectively), in CD36 (by 35% and 38%, respectively), and in cellular total peroxides content (by 18% and 20%, respectively). rePON1 also significantly inhibited CD11b and CD36 expression, and cellular total peroxides during PMA-induced THP-1 monocytes differentiation, by 68%, 56% and 53%, respectively. Similar effects were observed upon using reconstituted HDL (rHDL) +rePON1, or human HDL +rePON1, in comparison to rHDL or to human HDL, as well as, HDL from C57BL/6 vs. PON1KO mice. Inhibition of monocyte-to-macrophage differentiation was demonstrated also by several dietary antioxidants such as vitamin E, gallic acid, or punicalagin (the major polyphenol in pomegranate). Whereas NADPH oxidase was not involved in PON1 anti-differentiation effect, mitochondrial complex I could be involved, as rotenone (complex I inhibitor) significantly decreased (by 77%) the expression of CD11b during THP-1 differentiation. Finally, blocking PON1 sulfhydryl group with N-ethylmalemide significantly attenuated PON1 inhibitory effect on THP-I monocyte-to-macrophage differentiation. HDL-associated PON1 inhibits monocyte-to-macrophage differentiation, and this effect could be related to PON1 peroxidase-like activity which involves its free sulfhydryl group. Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.

  19. Protectors or Traitors: The Roles of PON2 and PON3 in Atherosclerosis and Cancer

    Directory of Open Access Journals (Sweden)

    Ines Witte

    2012-01-01

    Full Text Available Cancer and atherosclerosis are major causes of death in western societies. Deregulated cell death is common to both diseases, with significant contribution of inflammatory processes and oxidative stress. These two form a vicious cycle and regulate cell death pathways in either direction. This raises interest in antioxidative systems. The human enzymes paraoxonase-2 (PON2 and PON3 are intracellular enzymes with established antioxidative effects and protective functions against atherosclerosis. Underlying molecular mechanisms, however, remained elusive until recently. Novel findings revealed that both enzymes locate to mitochondrial membranes where they interact with coenzyme Q10 and diminish oxidative stress. As a result, ROS-triggered mitochondrial apoptosis and cell death are reduced. From a cardiovascular standpoint, this is beneficial given that enhanced loss of vascular cells and macrophage death forms the basis for atherosclerotic plaque development. However, the same function has now been shown to raise chemotherapeutic resistance in several cancer cells. Intriguingly, PON2 as well as PON3 are frequently found upregulated in tumor samples. Here we review studies reporting PON2/PON3 deregulations in cancer, summarize most recent findings on their anti-oxidative and antiapoptotic mechanisms, and discuss how this could be used in putative future therapies to target atherosclerosis and cancer.

  20. Role of paraoxonase 1 (PON1) in organophosphate metabolism: Implications in neurodegenerative diseases

    Energy Technology Data Exchange (ETDEWEB)

    Androutsopoulos, Vasilis P. [Center of Toxicology Science and Research, University of Crete, Heraklion, Crete (Greece); Kanavouras, Konstantinos [Laboratory of Neurological Sciences, University of Crete, Heraklion, Crete (Greece); Tsatsakis, Aristidis M., E-mail: aris@med.uoc.gr [Center of Toxicology Science and Research, University of Crete, Heraklion, Crete (Greece)

    2011-11-15

    Organophosphate pesticides are a class of compounds that are widely used in agricultural and rural areas. Paraoxonase 1 (PON1) is a phase-I enzyme that is involved in the hydrolysis of organophosphate esters. Environmental poisoning by organophosphate compounds has been the main driving force of previous research on PON1 enzymes. Recent discoveries in animal models have revealed the important role of the enzyme in lipid metabolism. However although PON1 function is well established in experimental models, the contribution of PON1 in neurodegenerative diseases remains unclear. In this minireview we summarize the involvement of PON1 genotypes in the occurrence of Parkinson's disease, Alzheimer's disease and amyotrophic lateral sclerosis. A brief overview of latest epidemiological studies, regarding the two most important PON1 coding region polymorphisms PON1-L55M and PON1-Q192R is presented. Positive and negative associations of PON1 with disease occurrence are reported. Notably the MM and RR alleles contribute a risk enhancing effect for the development of some neurodegenerative diseases, which may be explained by the reduced lipoprotein free radical scavenging activity that may give rise to neuronal damage, through distinct mechanism. Conflicting findings that fail to support this postulate may represent the human population ethnic heterogeneity, different sample size and environmental parameters affecting PON1 status. We conclude that further epidemiological studies are required in order to address the exact contribution of PON1 genome in combination with organophosphate exposure in populations with neurodegenerative diseases.

  1. Energy Efficiency in Future PONs

    DEFF Research Database (Denmark)

    Reschat, Halfdan; Laustsen, Johannes Russell; Wessing, Henrik

    2012-01-01

    There is a still increasing tendency to give energy efficiency a high priority, even in already low energy demanding systems. This is also the case for Passive Optical Networks (PONs) for which many different methods for saving energy are proposed. This paper uses simulations to evaluate three...... proposed power saving solutions for PONs which use sleep mechanisms for saving power. The discovered advantages and disadvantages of these methods are then used as a basis for proposing a new solution combining different techniques in order to increase the energy efficiency further. This novel solution...

  2. PON1 and Mediterranean Diet

    Directory of Open Access Journals (Sweden)

    José M. Lou-Bonafonte

    2015-05-01

    Full Text Available The Mediterranean diet has been proven to be highly effective in the prevention of cardiovascular diseases. Paraoxonase 1 (PON1 has been implicated in the development of those conditions, especially atherosclerosis. The present work describes a systematic review of current evidence supporting the influence of Mediterranean diet and its constituents on this enzyme. Despite the differential response of some genetic polymorphisms, the Mediterranean diet has been shown to exert a protective action on this enzyme. Extra virgin olive oil, the main source of fat, has been particularly effective in increasing PON1 activity, an action that could be due to low saturated fatty acid intake, oleic acid enrichment of phospholipids present in high-density lipoproteins that favor the activity, and increasing hepatic PON1 mRNA and protein expressions induced by minor components present in this oil. Other Mediterranean diet constituents, such as nuts, fruits and vegetables, have been effective in modulating the activity of the enzyme, pomegranate and its compounds being the best characterized items. Ongoing research on compounds isolated from all these natural products, mainly phenolic compounds and carotenoids, indicates that some of them are particularly effective, and this may enhance the use of nutraceuticals and functional foods capable of potentiating PON1 activity.

  3. PON1 and Mediterranean Diet

    Science.gov (United States)

    Lou-Bonafonte, José M.; Gabás-Rivera, Clara; Navarro, María A.; Osada, Jesús

    2015-01-01

    The Mediterranean diet has been proven to be highly effective in the prevention of cardiovascular diseases. Paraoxonase 1 (PON1) has been implicated in the development of those conditions, especially atherosclerosis. The present work describes a systematic review of current evidence supporting the influence of Mediterranean diet and its constituents on this enzyme. Despite the differential response of some genetic polymorphisms, the Mediterranean diet has been shown to exert a protective action on this enzyme. Extra virgin olive oil, the main source of fat, has been particularly effective in increasing PON1 activity, an action that could be due to low saturated fatty acid intake, oleic acid enrichment of phospholipids present in high-density lipoproteins that favor the activity, and increasing hepatic PON1 mRNA and protein expressions induced by minor components present in this oil. Other Mediterranean diet constituents, such as nuts, fruits and vegetables, have been effective in modulating the activity of the enzyme, pomegranate and its compounds being the best characterized items. Ongoing research on compounds isolated from all these natural products, mainly phenolic compounds and carotenoids, indicates that some of them are particularly effective, and this may enhance the use of nutraceuticals and functional foods capable of potentiating PON1 activity. PMID:26024295

  4. PON1 status does not influence cholinesterase activity in Egyptian agricultural workers exposed to chlorpyrifos

    Energy Technology Data Exchange (ETDEWEB)

    Ellison, Corie A., E-mail: cellison@buffalo.edu [Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY 14214 (United States); Crane, Alice L., E-mail: alcrane@buffalo.edu [Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY 14214 (United States); Bonner, Matthew R., E-mail: mrbonner@buffalo.edu [Department of Social and Preventive Medicine, State University of New York at Buffalo, Buffalo, NY 14214 (United States); Knaak, James B., E-mail: jbknaak@aol.com [Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY 14214 (United States); Browne, Richard W., E-mail: rwbrowne@buffalo.edu [Department of Biotechnical and Clinical Laboratory Sciences, State University of New York at Buffalo, Buffalo, NY 14214 (United States); Lein, Pamela J., E-mail: pjlein@ucdavis.edu [Department of Molecular Biosciences, University of California School of Veterinary Medicine, Davis, CA 95618 (United States); Olson, James R., E-mail: jolson@buffalo.edu [Department of Pharmacology and Toxicology, School of Medicine and Biomedical Sciences, State University of New York at Buffalo, Buffalo, NY 14214 (United States); Department of Social and Preventive Medicine, State University of New York at Buffalo, Buffalo, NY 14214 (United States)

    2012-12-15

    Animal studies have shown that paraoxonase 1 (PON1) genotype can influence susceptibility to the organophosphorus pesticide chlorpyrifos (CPF). However, Monte Carlo analysis suggests that PON1 genotype may not affect CPF-related toxicity at low exposure conditions in humans. The current study sought to determine the influence of PON1 genotype on the activity of blood cholinesterase as well as the effect of CPF exposure on serum PON1 in workers occupationally exposed to CPF. Saliva, blood and urine were collected from agricultural workers (n = 120) from Egypt's Menoufia Governorate to determine PON1 genotype, blood cholinesterase activity, serum PON1 activity towards chlorpyrifos-oxon (CPOase) and paraoxon (POase), and urinary levels of the CPF metabolite 3,5,6-trichloro-2-pyridinol (TCPy). The PON1 55 (P ≤ 0.05) but not the PON1 192 genotype had a significant effect on CPOase activity. However, both the PON1 55 (P ≤ 0.05) and PON1 192 (P ≤ 0.001) genotypes had a significant effect on POase activity. Workers had significantly inhibited AChE and BuChE after CPF application; however, neither CPOase activity nor POase activity was associated with ChE depression when adjusted for CPF exposure (as determined by urinary TCPy levels) and stratified by PON1 genotype. CPOase and POase activity were also generally unaffected by CPF exposure although there were alterations in activity within specific genotype groups. Together, these results suggest that workers retained the capacity to detoxify chlorpyrifos-oxon under the exposure conditions experienced by this study population regardless of PON1 genotype and activity and that effects of CPF exposure on PON1 activity are minimal. -- Highlights: ► CPF exposure resulted in an increase in TCPy and decreases in BuChE and AChE. ► CPOase activity decreased in subjects with the PON1 55LM and PON1 55 MM genotypes. ► Neither PON1 genotype nor CPOase activity had an effect on BuChE or AChE inhibition.

  5. Contrasting genetic influence of PON 1 coding gene polymorphisms ...

    African Journals Online (AJOL)

    Nadia Youssef Sadek Morcos

    2015-03-31

    Mar 31, 2015 ... metabolites (oxons) of many organophosphorus (OP) insecticides. Human PON1 displays ... records of 42 patients admitted to the Poisoning Control ... mean ± SD for normally distributed data. Qualitative .... to ATG in exon 3) is correlated with the blood enzyme level, .... cardiovascular disease in diabetes.

  6. Analysis of Coexisting GPON and NG-PON1 (10G-PON) Systems

    National Research Council Canada - National Science Library

    M. D. Mraković; P. S. Matavulj

    2011-01-01

    In this paper, the simulation model of coexisting GPON and NG-PON1 (10G-PON) systems is presented, which has been developed for the analysis of feasibility and implementation issues of this coexistence...

  7. WDM PONs based on colorless technology

    Science.gov (United States)

    Saliou, Fabienne; Simon, Gael; Chanclou, Philippe; Pizzinat, Anna; Lin, Huafeng; Zhou, Enyu; Xu, Zhiguang

    2015-12-01

    Wavelength Division Multiplexing (WDM) Passive Optical Network (PON) is foreseen to be part of the Next Generation Passive Optical Networks. Business and mobile fronthaul networks already express the need to develop WDM PONs in the access segment. Fixed wavelength transceivers based on Coarse WDM are already available to respond to today's market needs but Dense WDM technologies will be needed and colorless technologies are essential to provide simple and cost-effective WDM PON systems. We propose in this paper to demonstrate the capabilities of a DWDM PON system prototype based on self-seeded RSOAs and designed to transmit CPRI over 60 km of fiber at 2.5 Gbit/s.

  8. Directed evolution of mammalian paraoxonases PON1 and PON3 for bacterial expression and catalytic specialization

    OpenAIRE

    Aharoni, Amir; Gaidukov, Leonid; Yagur, Shai; Toker, Lilly; Silman, Israel; Tawfik, Dan S.

    2003-01-01

    Serum paraoxonases (PONs) are a group of enzymes that play a key role in organophosphate (OP) detoxification and in prevention of atherosclerosis. However, their structure and mechanism of action are poorly understood. PONs seem like jacks-of-all-trades, acting on a very wide range of substrates, most of which are of no physiological relevance. Family shuffling and screening lead to the first PON variants that express in a soluble and active form in Escherichia coli. We describe variants with...

  9. Diminished epinephrine response to hypoglycemia despite enlarged adrenal medulla in trained rats

    DEFF Research Database (Denmark)

    Stallknecht, B; Kjaer, M; Mikines, K J

    1990-01-01

    Studies in humans have indicated that trained athletes compared with sedentary subjects have an increased capacity to secrete epinephrine. To investigate whether this is due to an adaptation induced by physical training or a selection phenomenon, rats were swim trained (T) 10 wk for 6 h....../day or served as controls being either sedentary freely eating (C), food restricted (FR), sham swim trained (ST), or cold stressed (CS). Adrenal glands were weighted and cross sectioned for light microscopic determination of size of the adrenal medulla. Endurance-trained compared with control rats had heavier......)]. Cold stress or sham swim training did not increase adrenal weight or volume of adrenal medulla (P greater than 0.05). To stimulate adrenal medulla secretion, rats had an insulin-induced hypoglycemia. Insulin dose needed to suppress plasma glucose below 4.0 mM was four times greater in sedentary...

  10. Genetic variants of the paraoxonases (PON1 and PON2) in the Chilean population.

    Science.gov (United States)

    Acuña, M; Eaton, L; Cifuentes, L

    2004-04-01

    We estimated the frequencies of PON1 and PON2 variants (linked genes) in two hospital samples taken from the northern (San José Hospital, SJH) and eastern (Clínica Las Condes, CLC) parts of Santiago, Chile, using the polymerase chain reaction followed by restriction endonuclease digestion. The two hospital samples have different degrees of Amerindian admixture (SJH, 34.5%; CLC, 15.9%), which is reflected in the observed frequencies of the PON1 *B allele (SJH, 43.1%; CLC, 33.7%) and the PON2*S allele (SJH, 86.3%; CLC, 77.6%); both allele frequencies are significantly different between samples. The frequencies of the combined PON1-PON2 genotypes *A/*B-*C/*C, *A/*B-*S/*S, and *B/*B-*S/*S and of the haplotypes PON*A,C and PON*B,S were significantly different between the SJH and CLC groups. None of the genotype frequencies deviated significantly from those predicted by the Hardy-Weinberg equation. No linkage disequilibrium was found between the PON1 alleles and any of the PON2 alleles in either group (all p > 0.05). In our samples 38.52% (SJH) and 26.25% (CLC) of chromosomes must have the haplotype PON*B,S, presumed to be related to the risk of coronary artery disease. Twenty-four of 193 (12.4%) SJH individuals and 7 of 122 (5.7%) CLC individuals were homozygotes for this haplotype. Finally, our data indicate ethnic-group-dependent genetic differences in the vulnerability to toxic organophosphorus.

  11. Origins of descending projections to the medulla oblongata and rostral medulla spinalis in the urodele Salamandra salamandra (amphibia).

    Science.gov (United States)

    Naujoks-Manteuffel, C; Manteuffel, G

    1988-07-08

    Descending projections to the medulla oblongata and rostral medulla spinalis have been examined in the urodele Salamandra salamandra with retrograde horseradish peroxidase tracing. Ipsilateral projections originate from the striatum and the nucleus ventrolateralis thalami and reach the medulla oblongata. The ipsilateral nucleus praeopticus magnocellularis reaches the medulla spinalis. The rostral part of the nucleus tuberculi posterioris projects to the ipsilateral medulla oblongata; its caudal part projects further caudally. Tectal efferents and the efferents of the nucleus praetectalis profundus project bilaterally, the nucleus praetectalis superficialis, nucleus mesencephalicus nervi trigemini, torus semicircularis, nucleus Darkschewitsch, and nucleus fasciculi longitudinalis medialis project ipsilaterally to the medulla oblongata. The nucleus mesencephalicus nervi trigemini, nucleus fasciculi longitudinalis medialis, and tectal efferents reach the rostral medulla spinalis. The nucleus ruber projects mainly via the contralateral dorsolateral funiculus to the medulla spinalis. A largely crossed medullary projection arises in the nucleus dorsalis tegmenti pars anterior, a bilateral projection arises in the nucleus dorsalis tegmenti pars posterior, and an ipsilateral projection arises in the nucleus ventralis tegmenti pars anterior. Cerebellar and statoacoustic efferents descend to the medulla spinalis. The nucleus reticularis isthmi, superior, medius and inferior as well as the nucleus raphes exhibit spinal trajectories. The nucleus vestibularis magnocellularis projects bilaterally, the nucleus vestibularis medialis projects ipsilaterally spinalward. The supposed nucleus descendens nervi trigemini descends mainly contralaterally. A small spinal projection arises in the nucleus tractus solitarii. The results indicate that salamander brains display elaborate descending connections which are similar to those in other vertebrates despite their scarcely differentiated

  12. Brainstem neurons projecting to the rostral ventral respiratory group (VRG) in the medulla oblongata of the rat revealed by co-application of NMDA and biocytin

    DEFF Research Database (Denmark)

    Zheng, Y; Riche, D; Rekling, J C

    1998-01-01

    Groups of neurons in the medulla and pons are essential for the rhythm generation, pattern formation and modulation of respiration. The rostral Ventral Respiratory Group (rVRG) is thought to be a crucial area for rhythm generation. Here we co-applied biocytin and NMDA in the rVRG to label...... retrogradely brainstem neurons reciprocally connected to a population of inspiratory neurons in the rat rVRG. The procedure excited rVRG neurons in multi-unit recordings and led to a Golgi-like labelling of distant cells presumably excited by efferents from the rVRG. Injection of biocytin without NMDA did...

  13. Monocyte-macrophage membrane possesses free radicals scavenging activity: stimulation by polyphenols or by paraoxonase 1 (PON1).

    Science.gov (United States)

    Rosenblat, M; Elias, A; Volkova, N; Aviram, M

    2013-04-01

    In the current study, we analysed free radicals scavenging activity of monocytes-macrophages in the absence or presence of antioxidants such as polyphenols or paraoxonase 1 (PON1). THP-1 human monocytic cell line, murine J774A.1 macrophages, as well as human primary monocytes have the capability to scavenge free radicals, as measured by the 1-diphenyl-2-picryl-hydrazyl (DPPH) assay. This effect (which could be attributed to the cell's membrane) was cell number and incubation time dependent. Upon incubation of J774A.1 macrophages with acetylated LDL (Ac-LDL), with VLDL, or with the radical generator, AAPH, the cells' lipid peroxides content, and paraoxonase 2 (PON2) activity were significantly increased. While non-treated cells decreased DPPH absorbance by 65%, the Ac-LDL-, VLDL- or AAPH-treated cells, decreased it by only 33%, 30%, or 45%, respectively. We next analysed the effect of J774A.1 macrophage enrichment with antioxidants, such as polyphenols or PON1 on the cells' free radicals scavenging activity. Non-treated cells decreased DPPH absorbance by 50%, whereas vitamin E-, punicalagin- or PJ-treated cells significantly further decreased it, by 75%. Similarly, in PON1-treated cells DPPH absorbance was further decreased by 63%, in association with 23% increment in PON1 catalytic activity. In cells under oxidative stress [treated with AAPH-, or with oxidized LDL], PON1 activity was decreased by 31% or 40%, as compared to the activity observed in PON1 incubated with non-treated cells. We conclude that monocytes-macrophages possess free radicals scavenging activity, which is decreased under atherogenic conditions, and increased upon cell enrichment with potent antioxidants such as nutritional polyphenols, or PON1.

  14. Phosphorylation of the Peptidoglycan Synthase PonA1 Governs the Rate of Polar Elongation in Mycobacteria.

    Directory of Open Access Journals (Sweden)

    Karen J Kieser

    2015-06-01

    Full Text Available Cell growth and division are required for the progression of bacterial infections. Most rod-shaped bacteria grow by inserting new cell wall along their mid-section. However, mycobacteria, including the human pathogen Mycobacterium tuberculosis, produce new cell wall material at their poles. How mycobacteria control this different mode of growth is incompletely understood. Here we find that PonA1, a penicillin binding protein (PBP capable of transglycosylation and transpeptidation of cell wall peptidoglycan (PG, is a major governor of polar growth in mycobacteria. PonA1 is required for growth of Mycobacterium smegmatis and is critical for M. tuberculosis during infection. In both cases, PonA1's catalytic activities are both required for normal cell length, though loss of transglycosylase activity has a more pronounced effect than transpeptidation. Mutations that alter the amount or the activity of PonA1 result in abnormal formation of cell poles and changes in cell length. Moreover, altered PonA1 activity results in dramatic differences in antibiotic susceptibility, suggesting that a balance between the two enzymatic activities of PonA1 is critical for survival. We also find that phosphorylation of a cytoplasmic region of PonA1 is required for normal activity. Mutations in a critical phosphorylated residue affect transglycosylase activity and result in abnormal rates of cell elongation. Together, our data indicate that PonA1 is a central determinant of polar growth in mycobacteria, and its governance of cell elongation is required for robust cell fitness during both host-induced and antibiotic stress.

  15. Physical enhanced security strategy implementation in WDM PON

    Science.gov (United States)

    Bai, K. Kalyani; Ashik T., J.; Kachare, Nitin; Kumar, D. Sriram

    2017-06-01

    The enormous growth in data traffic in optical networks has raised the requirement of broadband access networks. Passive Optical Networks (PON) is capable of solving the power, bandwidth and cost problems. Time Division Multiplexed PON (TDM PON) uses a point to multipoint design which is currently being used for data transmission that initiated the requirement of maintaining customer's security in the downstream direction. These security impairments trigger the need of scrutiny for fault monitoring and eavesdropping in PONs. This paper demonstrates the Wavelength Division Multiplexed PONs (WDM-PON) using scrambling and fault monitoring to provide security which is absent in TDM passive optical networks. Results have been validated at 10 Gbps data rate using OPTISYSTEM12 simulation tool.

  16. Analysis of Coexisting GPON and NG-PON1 (10G-PON Systems

    Directory of Open Access Journals (Sweden)

    M. D. Mraković

    2011-06-01

    Full Text Available In this paper, the simulation model of coexisting GPON and NG-PON1 (10G-PON systems is presented, which has been developed for the analysis of feasibility and implementation issues of this coexistence. The aim was to analyze the impact of the most important parameters of the components that are needed for new network elements, on the performance of these coexistent networks. On the basis of the results obtained, the optimal parameters of the new system components were defined.

  17. Existing PON Infrastructure Supported Hybrid Fiber-Wireless Sensor Networks

    DEFF Research Database (Denmark)

    Yu, Xianbin; Zhao, Ying; Deng, Lei

    2012-01-01

    We propose a hybrid fiber wireless sensor network based on the existing PON infrastructure. The feasibility of remote sensing and PON convergence is experimentally proven by transmitting direct-sequence spread-spectrum wireless sensing and 2.5Gbps GPON signals.......We propose a hybrid fiber wireless sensor network based on the existing PON infrastructure. The feasibility of remote sensing and PON convergence is experimentally proven by transmitting direct-sequence spread-spectrum wireless sensing and 2.5Gbps GPON signals....

  18. Wavelength-agnostic WDM-PON System

    DEFF Research Database (Denmark)

    Wagner, Christoph; Eiselt, Michael; Zou, S.

    2016-01-01

    Next-generation WDM-PON solutions for metro and access systems will take advantage of remotely controlled wavelength-tunable ONUs to keep system costs as low as possible. For such a purpose, each ONU signal can be labeled by a pilot tone modulated onto the optical data stream. We report...... on the standardization status of this lowcost system in the new ITU-T G.metro draft recommendation, in the context of autonomous tuning. We also discuss some low-effort implementations of the pilot-tone labels and investigate the impact of these labels on the transmission channels....

  19. Decreased catecholamine secretion from the adrenal medullae of chronically diabetic BB-Wistar rats

    Science.gov (United States)

    Wilke, R. A.; Riley, D. A.; Lelkes, P. I.; Hillard, C. J.

    1993-01-01

    Many humans with IDDM eventually lose the capacity to secrete epinephrine from their adrenal medullae. The mechanism for this pathological change is unknown. We hypothesized that this abnormality is attributable to neuropathic changes in the greater splanchnic nerves or in the chromaffin cells that they innervate. To study this hypothesis, we isolated rat adrenal glands, perfused them ex vivo, and measured the epinephrine content of the perfusate under various conditions of stimulation. We used transmural electrical stimulation (20-80 V, at 10 Hz) to induce epinephrine secretion indirectly by selectively activating residual splanchnic nerve terminals within the isolated glands. Under these conditions, epinephrine secretion was severely attenuated in glands from female BB-Wistar rats with diabetes of 4 mo duration compared with their age-matched, nondiabetic controls. These perfused diabetic adrenal medullae also demonstrated decreased catecholamine release in response to direct chromaffin cell depolarization with 20 mM K+, evidence that a functional alteration exists within the chromaffin cells themselves. Nonetheless, total catecholamine content of adrenal medullae from these diabetic rats was not significantly different from controls, indicating that the secretory defect was not simply attributable to a difference in the amount of catecholamines stored and available for release. Herein, we also provide histological evidence of degenerative changes within the cholinergic nerve terminals that innervate these glands.

  20. Securing confidentiality in PON and HFC networks

    Science.gov (United States)

    Koulouris, John; Koulouris, A.

    1998-09-01

    In Some kind of networks like PON (Passive Optical Networks) and HFC (Hybrid Fiber Coaxial) networks, the information from the central station (headend) to the terminals is broadcast to all of them. So each one of them besides its own data gets also the data destined for the others. Under these conditions privacy and confidentiality do not exist. The usual way to overcome this drawback is conventional encryption of the data between headend and terminals. This method besides making the communication procedure more complex, has also the drawback that traffic data cannot be protected, since the destination field of each cell cannot be encrypted. Here another method is presented which, although not encryption in the conventional meaning of the term, secures a high degree of individuality and confidentiality. The basic idea is to use different multiplexing patterns for each connection so that each terminal can demultiplex only its own data. The method is suited for the high data speed of the PON networks and maybe preferable to conventional encryption.

  1. Contrasting genetic influence of PON 1 coding gene polymorphisms ...

    African Journals Online (AJOL)

    Nadia Youssef Sadek Morcos

    2015-03-31

    Mar 31, 2015 ... (PON1), is a polymorphic enzyme that is involved in the detox- ification of several important OPs. Paraoxonase takes its name from the ability to hydrolyze paraoxon (PO), the highly toxic metabolite of the insecticide parathion. Other OP substrates of PON1 include chlorpyrifos oxon (CPO) and diazoxon.

  2. WDM-PON Architecture for FTTx Networks

    Science.gov (United States)

    Iannone, E.; Franco, P.; Santoni, S.

    Broadband services for residential users in European countries have until now largely relied on xDSL technologies, while FTTx technologies have been mainly exploited in Asia and North America. The increasing bandwidth demand and the growing penetration of new services are pushing the deployment of optical access networks, and major European operators are now announcing FTTx projects. While FTTH is recognized as the target solution to bring broadband services to residential users, the identification of an FTTx evolutionary path able to seamlessly migrate to FTTH is key to enabling a massive deployment, easing the huge investments needed. WDM-PON architecture is an interesting solution that is able to accommodate the strategic need of building a new fiber-based access infrastructure with the possibility of adapting investments to actual demands and evolving to FTTH without requiring further interventions on fiber infrastructures.

  3. Paraoxonase 1 (PON1) Status and Risk of Insecticide Exposure

    Energy Technology Data Exchange (ETDEWEB)

    Furlong, Clement E.; Cole, Toby B.; Walter, Betsy J.; Shih, Diana M.; Tward, Aaron; Lusis, Aldons J.; Timchalk, Chuck; Richter, Rebecca J.; Costa, Lucio G.

    2005-06-23

    Paraoxonase 1 (PON1) is an HDL associated enzyme that catalyzes a number of different reactions including the hydrolysis of the toxic oxon metabolites of the insecticides diazinon and chlorpyrifos. PON1 has also been implicated in the detoxication of oxidized lipids and the metabolism of a number of drugs, activating some, while inactivating others. There are two common PON1 coding region polymorphisms (L55M and Q192R). The latter determines the catalytic efficiency of hydrolysis of a number of substrates including chlorpyrifos oxon, but not diazoxon. Evidence for the physiological importance of PON1 in modulating exposures to these two insecticides comes from several different studies. Early studies noted that species with high levels of PON1 were much more resistant to certain organophosphorus (OP) insecticides than were species with low levels. Another early study by Main demonstrated that injected rabbit paraoxonase protected rats from paraoxon toxicity. Our research group began the development of a mouse model system for examining the importance of PON1 in the detoxication of OP insecticides.

  4. Hybrid Microoptical WDM Receiver for PON Communication

    Directory of Open Access Journals (Sweden)

    Vitezslav Jerabek

    2012-01-01

    Full Text Available The paper presents the design, simulation and construction results of the wavelength division multiplex (WDM optical hybrid receiver module for the passive optical network (PON. The optical WDM receiver was constructed using system of three micromodules in the new circle topology. The optical micromodule contains multimode fiber pigtail 50/125 µm, VHGT filter with collimation lens and two microwave optoelectronics receiver micromodules (OE receiver micromodules. OE receiver micromodules were designed by use small signal equivalent electrical circuit model and noise model, from which the mathematically solved the transmittance function, which was used for calculation and simulation of the optimal frequency characteristics and signal to noise ratio. For determine the limit frequency of OE receiver micromodule, the transcendent equation with transmittance function was numerically solved. OE receiver micromodule was composed of decollimation lenses and microwave optoelectronics receivers with bandwidth 2,5 GHz and alternatively in SMD technology with bandwidth 1,25 GHz, using the thin layer hybrid technology. WDM receiver use radiation 1490 nm for internet and 1550 nm for digital TV signals download information.

  5. Pendrin localizes to the adrenal medulla and modulates catecholamine release.

    Science.gov (United States)

    Lazo-Fernandez, Yoskaly; Aguilera, Greti; Pham, Truyen D; Park, Annie Y; Beierwaltes, William H; Sutliff, Roy L; Verlander, Jill W; Pacak, Karel; Osunkoya, Adeboye O; Ellis, Carla L; Kim, Young Hee; Shipley, Gregory L; Wynne, Brandi M; Hoover, Robert S; Sen, Shurjo K; Plotsky, Paul M; Wall, Susan M

    2015-09-15

    Pendrin (Slc26a4) is a Cl(-)/HCO3 (-) exchanger expressed in renal intercalated cells and mediates renal Cl(-) absorption. With pendrin gene ablation, blood pressure and vascular volume fall, which increases plasma renin concentration. However, serum aldosterone does not significantly increase in pendrin-null mice, suggesting that pendrin regulates adrenal zona glomerulosa aldosterone production. Therefore, we examined pendrin expression in the adrenal gland using PCR, immunoblots, and immunohistochemistry. Pendrin protein was detected in adrenal lysates from wild-type but not pendrin-null mice. However, immunohistochemistry and qPCR of microdissected adrenal zones showed that pendrin was expressed in the adrenal medulla, rather than in cortex. Within the adrenal medulla, pendrin localizes to both epinephrine- and norepinephrine-producing chromaffin cells. Therefore, we examined plasma catecholamine concentration and blood pressure in wild-type and pendrin-null mice under basal conditions and then after 5 and 20 min of immobilization stress. Under basal conditions, blood pressure was lower in the mutant than in the wild-type mice, although epinephrine and norepinephrine concentrations were similar. Catecholamine concentration and blood pressure increased markedly in both groups with stress. With 20 min of immobilization stress, epinephrine and norepinephrine concentrations increased more in pendrin-null than in wild-type mice, although stress produced a similar increase in blood pressure in both groups. We conclude that pendrin is expressed in the adrenal medulla, where it blunts stress-induced catecholamine release.

  6. The normal and pathologic renal medulla: a comprehensive overview.

    Science.gov (United States)

    López, José I; Larrinaga, Gorka; Kuroda, Naoto; Angulo, Javier C

    2015-04-01

    The renal medulla comprises an intricate system of tubules, blood vessels and interstitium that is not well understood by most general pathologists. We conducted an extensive review of the literature on the renal medulla, in both normal and pathologic conditions. We set out in detail the points of key interest to pathologists: normal and pathological development, physiology, microscopic anatomy, histology and immunohistochemistry; and the specific and most common other types of disease associated with this part of the kidney: developmental abnormalities, (multicystic dysplastic kidney, autosomal dominant and recessive polycystic kidney diseases, medullary cystic kidney disease), inflammatory conditions (xanthogranulomatous pyelonephritis, malakoplakia), hyperplasia and dysplasia, and neoplastic processes (oncocytoma, atypical oncocytic tumors, chromophobe cell carcinoma, collecting duct carcinoma, urothelial carcinoma, other carcinomas, renal medullary fibroma and metastatic tumors). This condensed overview of the origin, function and pathology of the renal medulla, both in terms of development, inflammation and neoplastic processes, should help focus the interest of clinical pathologists on this widely overlooked part of the kidney. Copyright © 2014 Elsevier GmbH. All rights reserved.

  7. Propagation impairments due to Raman effect on the coexistence of GPON, XG-PON, RF-video and TWDM-PON

    OpenAIRE

    Curri, Vittorio; Gaudino, Roberto

    2013-01-01

    We analyze propagation effects in the coexistence of GPON, XG-PON, RF-Video and TWDM-PON. We show that high power TWDM-PON channels excite Stimulated Raman Scattering inducing extra-loss on GPON due to power depletion. We address the problem through simulations and propose and validate a simple analytical model for the effect

  8. Validation of a Paraoxon-based method for measurement of Paraoxonase (PON-1 activity and establishment of RI in horses

    Directory of Open Access Journals (Sweden)

    Beatrice Ruggerone

    2017-05-01

    Full Text Available Paraoxonase-1 (PON-1 is an anti-oxidant compound considered as negative acute phase protein in animals (Rossi et al., 2013 and people (Novak et al., 2010. The paraoxon-based method for measurement of PON-1 in equine serum has not yet been validated. The aim of this study is to validate a paraoxon-based method to measure PON-1 and to establish reference intervals (RIs in healthy horses and foals. 120 horses (40 geldings, 40 stallions, 40 mares; median age: 11 years; 57 Warmbloods, 46 Trotters and 55 foals (27 females, 28 males; median age: 47 days; 22 Warmbloods, 31 Trotters considered healthy after physical examination and biochemistry were examined. Horses were grouped by breed: Thoroughbreds, Trotters, Warmbloods, Draft horses and Ponies. Serum PON-1 was measured with an automated spectrophotometer and an enzymatic method validated in other species (Giordano et al., 2013. After the analytical validation (precision, accuracy, interference studies, RIs were determined using the Reference Value Advisor software, according to ASCVP guidelines (Friedrichs et al., 2012. The possible gender-, age- and breed-related differences were statistically investigated. The paraoxon-based method was precise (CVs <4.0% and accurate (P<0.001 in linearity under dilution and spike-recovery testing but is affected by interference from mild bilirubinemia, severe lipemia or hemoglobinemia. The RIs recorded in the whole population was 38.1-80.8 U/mL. According to the Harris and Boyd test, separate RIs are recommended only for adult females and for Warmblood and Trotter adults (Figure 1. This study demonstrated that analytical performances of the paraoxon-based method for measurement of PON-1 in horses are acceptable. PON-1 is lower in horses than in other species. If future studies will demonstrate that oxidative stress induces a significant decrease of PON-1, this results will be useful to correctly classify healthy and sick horses; PON-1 could be used, as in human

  9. Mapping of neurokinin-like immunoreactivity in the human brainstem

    Directory of Open Access Journals (Sweden)

    Narvaez Jose

    2003-02-01

    Full Text Available Abstract Background Using an indirect immunoperoxidase technique, we have studied the distribution of immunoreactive fibers and cell bodies containing neurokinin in the adult human brainstem with no prior history of neurological or psychiatric disease. Results Clusters of immunoreactive cell bodies and high densities of neurokinin-immunoreactive fibers were located in the periaqueductal gray, the dorsal motor nucleus of the vagus and in the reticular formation of the medulla, pons and mesencephalon. Moreover, immunoreactive cell bodies were found in the inferior colliculus, the raphe obscurus, the nucleus prepositus hypoglossi, and in the midline of the anterior medulla oblongata. In general, immunoreactive fibers containing neurokinin were observed throughout the whole brainstem. In addition to the nuclei mentioned above, the highest densities of such immunoreactive fibers were located in the spinal trigeminal nucleus, the lateral reticular nucleus, the nucleus of the solitary tract, the superior colliculus, the substantia nigra, the nucleus ambiguus, the gracile nucleus, the cuneate nucleus, the motor hypoglossal nucleus, the medial and superior vestibular nuclei, the nucleus prepositus hypoglossi and the interpeduncular nucleus. Conclusion The widespread distribution of immunoreactive structures containing neurokinin in the human brainstem indicates that neurokinin might be involved in several physiological mechanisms, acting as a neurotransmitter and/or neuromodulator.

  10. Power margin improvement for OFDMA-PON using hierarchical modulation.

    Science.gov (United States)

    Cao, Pan; Hu, Xiaofeng; Zhuang, Zhiming; Zhang, Liang; Chang, Qingjiang; Yang, Qi; Hu, Rong; Su, Yikai

    2013-04-08

    We propose and experimentally demonstrate a hierarchical modulation scheme to improve power margin for orthogonal frequency division multiple access-passive optical networks (OFDMA-PONs). In a PON system, under the same launched optical power, optical network units (ONUs) have different power margins due to unequal distribution fiber lengths. The power margin of the PON system is determined by the ONU with the lowest power margin. In our proposed scheme, ONUs with long and short distribution fibers are grouped together, and downstream signals for the paired ONUs are mapped onto the same OFDM subcarriers using hierarchical modulation. In a pair of ONUs, part of the power margin of the ONU with short distribution fiber is re-allocated to the ONU with long distribution fiber. Therefore, the power margin of the ONU with the longest distribution fiber can be increased, leading to the power margin improvement of the PON system. Experimental results show that the hierarchical modulation scheme improves the power margin by 2.7 dB for an OFDMA-PON system, which can be used to support more users or extend transmission distance.

  11. An unusual case of human rabies thought to be of chiropteran origin

    African Journals Online (AJOL)

    1971-07-17

    Jul 17, 1971 ... fifth cranial nerve, right frontal lobe, right parietal lobe, right occipital lobe, pons, medulla, vermis cerebelli, cere- bellum, nucleus dentatus, hippocampus, substantia nigra, basal ganglia, thalamus and corpora mamalaria. Sections were also prepared from various levels of the cervical thoracic, lumbar and ...

  12. Mathematical Model of Ammonia Handling in the Rat Renal Medulla

    Science.gov (United States)

    Noiret, Lorette; Baigent, Stephen; Jalan, Rajiv; Thomas, S. Randall

    2015-01-01

    The kidney is one of the main organs that produces ammonia and release it into the circulation. Under normal conditions, between 30 and 50% of the ammonia produced in the kidney is excreted in the urine, the rest being absorbed into the systemic circulation via the renal vein. In acidosis and in some pathological conditions, the proportion of urinary excretion can increase to 70% of the ammonia produced in the kidney. Mechanisms regulating the balance between urinary excretion and renal vein release are not fully understood. We developed a mathematical model that reflects current thinking about renal ammonia handling in order to investigate the role of each tubular segment and identify some of the components which might control this balance. The model treats the movements of water, sodium chloride, urea, NH3 and NH4+, and non-reabsorbable solute in an idealized renal medulla of the rat at steady state. A parameter study was performed to identify the transport parameters and microenvironmental conditions that most affect the rate of urinary ammonia excretion. Our results suggest that urinary ammonia excretion is mainly determined by those parameters that affect ammonia recycling in the loops of Henle. In particular, our results suggest a critical role for interstitial pH in the outer medulla and for luminal pH along the inner medullary collecting ducts. PMID:26280830

  13. Paraoxonase 2 (PON2) in the mouse central nervous system: A neuroprotective role?

    Energy Technology Data Exchange (ETDEWEB)

    Giordano, Gennaro [Dept. of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA (United States); Cole, Toby B. [Dept. of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA (United States); Dept. of Medicine (Div. of Medical Genetics), University of Washington, Seattle, WA (United States); Dept. of Genome Sciences, University of Washington, Seattle, WA (United States); Furlong, Clement E. [Dept. of Medicine (Div. of Medical Genetics), University of Washington, Seattle, WA (United States); Dept. of Genome Sciences, University of Washington, Seattle, WA (United States); Costa, Lucio G., E-mail: lgcosta@u.washington.edu [Dept. of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA (United States); Dept. of Human Anatomy, Pharmacology and Forensic Science, University of Parma Medical School, Parma (Italy)

    2011-11-15

    The aims of this study were to characterize the expression of paraoxonase 2 (PON2) in mouse brain and to assess its antioxidant properties. PON2 levels were highest in the lung, intestine, heart and liver, and lower in the brain; in all tissues, PON2 expression was higher in female than in male mice. PON2 knockout [PON2{sup -/-}] mice did not express any PON2, as expected. In the brain, the highest levels of PON2 were found in the substantia nigra, the nucleus accumbens and the striatum, with lower levels in the cerebral cortex, hippocampus, cerebellum and brainstem. A similar regional distribution of PON2 activity (measured by dihydrocoumarin hydrolysis) was also found. PON3 was not detected in any brain area, while PON1 was expressed at very low levels, and did not show any regional difference. PON2 levels were higher in astrocytes than in neurons isolated from all brain regions, and were highest in cells from the striatum. PON2 activity and mRNA levels followed a similar pattern. Brain PON2 levels were highest around birth, and gradually declined. Subcellular distribution experiments indicated that PON2 is primarily expressed in microsomes and in mitochondria. The toxicity in neurons and astrocytes of agents known to cause oxidative stress (DMNQ and H{sub 2}O{sub 2}) was higher in cells from PON2{sup -/-} mice than in the same cells from wild-type mice, despite similar glutathione levels. These results indicate that PON2 is expressed in the brain, and that higher levels are found in dopaminergic regions such as the striatum, suggesting that this enzyme may provide protection against oxidative stress-mediated neurotoxicity.

  14. Effect of moxifloxacin on oxidative stress, paraoxonase-1 (PON1 ...

    African Journals Online (AJOL)

    Purpose: To investigate the effect of moxifloxacin on paraoxonase-1 (PON1) activity, and serum oxidative stress in patients with multiple drug-resistant tuberculosis (MDR-TB). Methods: A total ofof 130 MDR-TB patients who were treated with moxifloxacin from October 2014 to October 2010 in Eastern Medical District of Linyi ...

  15. Contrasting genetic influence of PON 1 coding gene polymorphisms ...

    African Journals Online (AJOL)

    In contrast, frequency distribution of PON1 Q192R polymorphism showed a highly significant (p< 0.001) difference between different grades of OP poisoning, with QQ genotype predominating in grade 4 with a frequency of 66.7%, followed by QR genotype (33.3%), while the RR and QR genotypes were similarly distributed ...

  16. Effect of moxifloxacin on oxidative stress, paraoxonase-1 (PON1 ...

    African Journals Online (AJOL)

    Purpose: To investigate the effect of moxifloxacin on paraoxonase-1 (PON1) activity, and serum oxidative stress in patients with multiple drug-resistant tuberculosis (MDR-TB). Methods: A total ofof 130 MDR-TB patients who were treated with moxifloxacin from October 2014 to. October 2010 in Eastern Medical District of ...

  17. The Effect of Cortex/Medulla Proportions on Molecular Diagnoses in Kidney Transplant Biopsies: Rejection and Injury Can Be Assessed in Medulla.

    Science.gov (United States)

    Madill-Thomsen, K S; Wiggins, R C; Eskandary, F; Böhmig, G A; Halloran, P F

    2017-08-01

    Histologic assessment of kidney transplant biopsies relies on cortex rather than medulla, but for microarray studies, the proportion cortex in a biopsy is typically unknown and could affect the molecular readings. The present study aimed to develop a molecular estimate of proportion cortex in biopsies and examine its effect on molecular diagnoses. Microarrays from 26 kidney transplant biopsies divided into cortex and medulla components and processed separately showed that many of the most significant differences were in glomerular genes (e.g. NPHS2, NPHS1, CLIC5, PTPRO, PLA2R1, PLCE1, PODXL, and REN). Using NPHS2 (podocin) to estimate proportion cortex, we examined whether proportion cortex influenced molecular assessment in the molecular microscope diagnostic system. In 1190 unselected kidney transplant indication biopsies (Clinicaltrials.govNCT01299168), only 11% had Molecular scores for antibody-mediated rejection, T cell-mediated rejection, and injury were independent of proportion cortex. Rejection was diagnosed in many biopsies that were mostly or all medulla. Agreement in molecular diagnoses in paired cortex/medulla samples (23/26) was similar to biological replicates (32/37). We conclude that NPHS2 expression can estimate proportion cortex; that proportion cortex has little influence on molecular diagnosis of rejection; and that, although histology cannot assess medulla, rejection does occur in medulla as well as cortex. © 2017 The American Society of Transplantation and the American Society of Transplant Surgeons.

  18. [Dorsal medulla oblongata stroke after a wasp sting].

    Science.gov (United States)

    Taurin, G; Canneva-Bourel, M L; Delafosse, J-M; Poirier, J; Merienne, M

    2006-03-01

    Although wasp stings can cause local reactions such as pain, flare, edema, swelling and severe reactions, including anaphylaxis; neurological vascular complications are rare. We report a case of a 36-year-old male who developed focal neurological symptoms after a wasp sting. The brain MRI showed an infarct in the left dorsal medulla. The blood test has showed an elevated level of venom-specific IgE antibodies and the skin test with wasp venom was highly positive. Improvement occurred rapidly after treatment with methylprednisone. The postulated mechanisms include vasoconstriction and platelet aggregation secondary to an injection of distinct allergens contained in wasp venom. It would thus be important to ask patients about any recent wasp sting, in order to provide appropriate treatment.

  19. TANDEM COMPRESSION OF MEDULLA SPINALIS AND CAUDA AEQUINA

    Directory of Open Access Journals (Sweden)

    Zhelyazkov Christo

    2015-03-01

    Full Text Available Objective: To analyze and present cases of tandem compression of medulla spinalis and cauda equina. Material and Methods: The subjects of observation were four patients with simultaneous compression of medulla spinalis and cauda equina, admitted to the Neurosurgery Clinic of the St George University Hospital, Plovdiv, Bulgaria during the period March 2012 — March 2014. The average age of the patients was 60.5 years (47–72. In one case, left-sided paramedian herniated discs were found at levels L1–2 and L4–5 combined with a concomitant stenosis, in another case — right-sided paramedian herniated discs on the level of Th12 — L1 and a degenerative stenosis at level of L3–4, in the third case — pronounced degenerative compression at level Th7–8 and a central stenosis at level of L4–5, and in the last case — degenerative stenosis at level L3–5 and spinal meningioma at level Th9–10. Results: The clinical signs of the simultaneous compression of the spinal cord and cauda equina have been examined. These signs may mislead the physician in the diagnosis of the spinal lesion, thus, resulting in inappropriate surgical strategy. Conclusion: The involvement of the spinal cord must be clinically confirmed to rule out lesions in the thoracic region. When the lumbar imaging examinations are inconclusive or cannot explain the clinical symptoms of a certain patient, it is advisable to perform a magnetic resonance imaging of the entire spin

  20. Unique Distribution of Aromatase in the Human Brain: In Vivo Studies With PET and [N-Methyl-11C]Vorozole

    Energy Technology Data Exchange (ETDEWEB)

    Biegon, A.; Biegon, A.; Kim, S.W.; Alexoff, D.; Millard, J.; Carter, P.; Hubbard, B.; King, P.; Logan, J.; Muench, L.; Pareto, D.; Schlyer, D.; Shea, C.; Telang, F.; Wang, G.-J.; Xu, Y.; Fowler, J.

    2010-10-01

    Aromatase catalyzes the last step in estrogen biosynthesis. Brain aromatase is involved in diverse neurophysiological and behavioral functions including sexual behavior, aggression, cognition, and neuroprotection. Using positron emission tomography (PET) with the radiolabeled aromatase inhibitor [N-methyl-{sup 11}C]vorozole, we characterized the tracer distribution and kinetics in the living human brain. Six young, healthy subjects, three men and three women, were administered the radiotracer alone on two separate occasions. Women were scanned in distinct phases of the menstrual cycle. Specificity was confirmed by pretreatment with a pharmacological (2.5 mg) dose of the aromatase inhibitor letrozole. PET data were acquired over a 90-min period and regions of interest placed over selected brain regions. Brain and plasma time activity curves, corrected for metabolites, were used to derive kinetic parameters. Distribution volume (V{sub T}) values in both men and women followed the following rank order: thalamus > amygdala = preoptic area > medulla (inferior olive) > accumbens, pons, occipital and temporal cortex, putamen, cerebellum, and white matter. Pretreatment with letrozole reduced VT in all regions, though the size of the reduction was region-dependent, ranging from {approx}70% blocking in thalamus andpreoptic area to {approx}10% in cerebellum. The high levels of aromatase in thalamus and medulla (inferior olive) appear to be unique to humans. These studies set the stage for the noninvasive assessment of aromatase involvement in various physiological and pathological processes affecting the human brain.

  1. Unique distribution of aromatase in the human brain: in vivo studies with PET and [N-methyl-11C]vorozole.

    Science.gov (United States)

    Biegon, Anat; Kim, Sung Won; Alexoff, David L; Jayne, Millard; Carter, Pauline; Hubbard, Barbara; King, Payton; Logan, Jean; Muench, Lisa; Pareto, Deborah; Schlyer, David; Shea, Colleen; Telang, Frank; Wang, Gene-Jack; Xu, Youwen; Fowler, Joanna S

    2010-11-01

    Aromatase catalyzes the last step in estrogen biosynthesis. Brain aromatase is involved in diverse neurophysiological and behavioral functions including sexual behavior, aggression, cognition, and neuroprotection. Using positron emission tomography (PET) with the radiolabeled aromatase inhibitor [N-methyl-(11)C]vorozole, we characterized the tracer distribution and kinetics in the living human brain. Six young, healthy subjects, three men and three women, were administered the radiotracer alone on two separate occasions. Women were scanned in distinct phases of the menstrual cycle. Specificity was confirmed by pretreatment with a pharmacological (2.5 mg) dose of the aromatase inhibitor letrozole. PET data were acquired over a 90-min period and regions of interest placed over selected brain regions. Brain and plasma time activity curves, corrected for metabolites, were used to derive kinetic parameters. Distribution volume (V(T)) values in both men and women followed the following rank order: thalamus > amygdala = preoptic area > medulla (inferior olive) > accumbens, pons, occipital and temporal cortex, putamen, cerebellum, and white matter. Pretreatment with letrozole reduced V(T) in all regions, though the size of the reduction was region-dependent, ranging from ∼70% blocking in thalamus andpreoptic area to ∼10% in cerebellum. The high levels of aromatase in thalamus and medulla (inferior olive) appear to be unique to humans. These studies set the stage for the noninvasive assessment of aromatase involvement in various physiological and pathological processes affecting the human brain.

  2. Brainstem neurons projecting to the rostral ventral respiratory group (VRG) in the medulla oblongata of the rat revealed by co-application of NMDA and biocytin.

    Science.gov (United States)

    Zheng, Y; Riche, D; Rekling, J C; Foutz, A S; Denavit-Saubié, M

    1998-01-26

    Groups of neurons in the medulla and pons are essential for the rhythm generation, pattern formation and modulation of respiration. The rostral Ventral Respiratory Group (rVRG) is thought to be a crucial area for rhythm generation. Here we co-applied biocytin and NMDA in the rVRG to label retrogradely brainstem neurons reciprocally connected to a population of inspiratory neurons in the rat rVRG. The procedure excited rVRG neurons in multi-unit recordings and led to a Golgi-like labelling of distant cells presumably excited by efferents from the rVRG. Injection of biocytin without NMDA did not label neurons in distant structures. Several brainstem ipsi- and contralateral structures were found to project to the rVRG, but three major respiratory-related structures, the nucleus of the solitary tract (NTS), the parabrachialis medialis and Kölliker-Fuse nuclei (PB/KF) and the caudal VRG, which are known to project bilaterally to the rVRG, were exclusively labelled ipsilaterally, suggesting an ipsilateral excitation of these structures by the rVRG. The pathways of efferent axons from labelled neurons in the rVRG were traced rostrally towards the pons and caudally to the spinal cord. Terminal axonal arborizations were seen in the same regions where retrogradely filled neurons were found as well as in a few other motor nuclei (the dorsal vagal motor nucleus and XII nucleus). Moreover, in the NTS and the PB/KF, efferent terminal varicosities were seen closely apposed to the soma and proximal dendrites of labelled neurons, suggesting monosynaptic connections between the rVRG and these nuclei.

  3. Performance Evaluation of Spectral Amplitude Codes for OCDMA PON

    DEFF Research Database (Denmark)

    Binti Othman, Maisara; Jensen, Jesper Bevensee; Zhang, Xu

    2011-01-01

    In this paper, we present a performance evaluation of three codes; enhanced double weight (EDW), random diagonal (RD) and zero cross correlation (ZCC) for 10 Gb/s x 4 user, 20 km standard SMF transmission link for OCDMA PON. These SAC codes have ideal in-phase cross-correlation properties to reduce...... the MAI effects in OCDMA. The performance has been characterized through received optical power (ROP) sensitivity and dispersion tolerance assessments. The numerical results show that the ZCC code has a slightly better performance compared to the other two codes for the ROP and similar behavior against...... the dispersion tolerence. In the analysis we also consider the character of the code properties and the flexibility as criteria for OCDMA PON network instead of the performance....

  4. Puentes para carretera en Serre-Ponçon

    Directory of Open Access Journals (Sweden)

    Courbon, J.

    1961-07-01

    Full Text Available En el Departamento de los Altos Alpes (Francia se ha proyectado levantar una presa de cierre sobre el rio Durance en una zona denominada Serre-Ponçon. La construcción de esta presa crea un remanso de unos 20 kilómetros de longitud que ha obligado a modificar los trazados de la línea férrea y varias carreteras cuyas plataformas se hallaban en zonas inundables por el referido remanso.

  5. Pressure effects on catalytic properties and structural stability of human paraoxonase

    Energy Technology Data Exchange (ETDEWEB)

    Clery-Barraud, C; Leva, J; Bakdouri, N E; Renault, F; Masson, P; Rochu, D [Departement de Toxicologie, Centre de Recherches du Service de Sante des Armees, BP 87, 38702 La Tronche cedex (France)], E-mail: cclerybarraud@crssa.net

    2008-07-15

    Human paraoxonase (HuPON1) is a candidate as catalytic bioscavenger for pre-treatment and therapy of poisoning by organophosphate compounds. HuPON1 is a hydrophobic protein associated with a partner, the human phosphate binding protein (HPBP) in plasma high density lipoproteins. The relationship between the composition and the size of multimeric states of HuPON1 is not well understood. Moreover the effect of HPBP's presence on enzyme catalytic mechanisms and stability is unclear. We investigated the effect of hydrostatic pressure and temperature on structural stability and activity of different PON1 preparations (hybrid recombinant PON1, natural HuPON1 free of its partner or in the presence of 50% w/w HPBP). We showed that PON1 exists under several multimeric forms and that the binding of HPBP amends the size of the hetero-oligomeric states and exerts a stabilizing effect on the activity of PON1.

  6. Unique features of the human brainstem and cerebellum.

    Science.gov (United States)

    Baizer, Joan S

    2014-01-01

    The cerebral cortex is greatly expanded in the human brain. There is a parallel expansion of the cerebellum, which is interconnected with the cerebral cortex. We have asked if there are accompanying changes in the organization of pre-cerebellar brainstem structures. We have examined the cytoarchitectonic and neurochemical organization of the human medulla and pons. We studied human cases from the Witelson Normal Brain Collection, analyzing Nissl sections and sections processed for immunohistochemistry for multiple markers including the calcium-binding proteins calbindin, calretinin, and parvalbumin, non-phosphorylated neurofilament protein, and the synthetic enzyme for nitric oxide, nitric oxide synthase. We have also compared the neurochemical organization of the human brainstem to that of several other species including the chimpanzee, macaque and squirrel monkey, cat, and rodent, again using Nissl staining and immunohistochemistry. We found that there are major differences in the human brainstem, ranging from relatively subtle differences in the neurochemical organization of structures found in each of the species studied to the emergence of altogether new structures in the human brainstem. Two aspects of human cortical organization, individual differences and left-right asymmetry, are also seen in the brainstem (principal nucleus of the inferior olive) and the cerebellum (the dentate nucleus). We suggest that uniquely human motor and cognitive abilities derive from changes at all levels of the central nervous system, including the cerebellum and brainstem, and not just the cerebral cortex.

  7. Unique Features of the Human Brainstem and Cerebellum

    Directory of Open Access Journals (Sweden)

    Joan S Baizer

    2014-04-01

    Full Text Available The cerebral cortex is greatly expanded in the human brain. There is a parallel expansion of the cerebellum, which is interconnected with the cerebral cortex. We have asked if there are accompanying changes in the organization of the precerebellar brainstem structures. We have examined the cytoarchitectonic and neurochemical organization of the human medulla and pons. We studied human cases from the Witelson Normal Brain Collection, analyzing Nissl sections and sections processed for immunohistochemistry for multiple markers including the calcium-binding proteins calbindin, calretinin and parvalbumin, nonphosphorylated neurofilament protein, and the synthetic enzyme for nitric oxide, nitric oxide synthase. We have also compared the neurochemical organization of the human brainstem to that of several other species including the chimpanzee, macaque and squirrel monkey, cat, and rodent, again using Nissl staining and immunohistochemistry. We found that there are major differences in the human brainstem, ranging from relatively subtle differences in the neurochemical organization of structures found in each of the species studied to the emergence of altogether new structures in the human brainstem. Two aspects of human cortical organization, individual differences and left-right asymmetry, are also seen in the brainstem (principal nucleus of the inferior olive and the cerebellum (the dentate nucleus. We suggest that uniquely human motor and cognitive abilities derive from changes at all levels of the central nervous system, including the cerebellum and brainstem, and not just the cerebral cortex.

  8. Exophytic giant cell glioblastoma of the medulla oblongata.

    Science.gov (United States)

    Luetjens, Goetz; Mirzayan, M Javad; Brandis, Almuth; Krauss, Joachim K

    2009-03-01

    Giant cell glioblastoma is a rare variant within the spectrum of glioblastoma multiforme (GBM) tumors. A giant cell glioblastoma may be associated with a better prognosis than the common type of GBM after combined treatment involving tumor resection and radiochemotherapy. A giant cell glioblastoma may occur at various sites in the brain and spinal cord. To the authors' knowledge, this type of tumor has not been previously reported as arising as an exophytic tumor from the medulla oblongata. The authors report on a 40-year-old man who presented with a large tumor located in the caudal fourth ventricle. The tumor was removed completely and the patient underwent percutaneous radiotherapy with 60 Gy and concomitant chemotherapy with temozolomide. Histopathological examination of the tumor revealed the typical features of a giant cell glioblastoma. At the 2-year follow-up the patient was doing well and showed no signs of tumor recurrence. It is important to identify variants of GBM because they may predict favorable long-term outcome, even when they arise from the caudal brainstem.

  9. Paraoxonase 2 protein is spatially expressed in the human placenta and selectively reduced in labour

    OpenAIRE

    Alwarfaly, Samy; Abdulsid, Akrem; Hanretty, Kevin; Lyall, Fiona

    2014-01-01

    Humans parturition involves interaction of hormonal, neurological, mechanical stretch and inflammatory pathways and the placenta plays a crucial role. The paraoxonases (PONs 1-3) protect against oxidative damage and lipid peroxidation, modulation of endoplasmic reticulum stress and regulation of apoptosis. Nothing is known about the role of PON2 in the placenta and labour. Since PON2 plays a role in oxidative stress and inflammation, both features of labour, we hypothesised that placental PON...

  10. Grant management procedure for energy saving TDM-PONs

    Science.gov (United States)

    Alaelddin, Fuad Yousif Mohammed; Newaz, S. H. Shah; AL-Hazemi, Fawaz; Choi, Jun Kyun

    2018-01-01

    In order to minimize energy consumption in Time Division Multiplexing-Passive Optical Network (TDM-PON), IEEE and ITU-T have mandated sleep mode mechanism for Optical Network Units (ONUs) in the latest TDM-PON standards (e.g. IEEE P1904.1 SIEPON, ITU-T G.sup45). The sleep mode mechanism is a promising mean for maximizing energy saving in an ONU. An ONU in sleep mode flips between sleep and active state depending on the presence or absent of upstream and downstream frames. To ensure Quality of Service (QoS) of upstream frames, the recent TDM-PON standards introduced an early wake-up mechanism, in which an ONU is forced to leave the sleep state on upstream frame arrival. When the Optical Line Terminal (OLT) of a TDM-PON allows early wake-up of its connected ONUs, it allocates gratuitous grants for the sleeping ONUs along with allocating upstream grants for the ONUs in active state. Note that, the gratuitous grants control message sent periodically by the OLT on Inter-Gratuitous grant Interval (IGI) time. After leaving sleep state due to the arrival of upstream frame, the ONU uses its allocated gratuitous grant to send a control message mentioning the amount of upstream bandwidth (upstream grant) required in order to forward the remaining frames in its buffer. However, the existing early wake-up process of ONU can lead to increase the energy consumption of an ONU. It is because of the ONU wakes-up immediately from the sleep state on arrival of the upstream frame, but even so, it needs to wait for forwarding the frame until its allocated gratuitous grant period, resulting in spending energy unnecessarily. In addition, current energy saving solution for TDM-PONs do not provide a clear solution on how to manage different types of grants (e.g. listening grant, upstream transmission grant) within a Dynamic Bandwidth Allocation (DBA) polling cycle. To address this problem, we propose a state-of-art Grant Management Procedure (GMP) in order to maximize energy saving in a TDM-PON

  11. STEREOLOGICAL ANALYSIS OF THE HUMAN PONS VASCULAR NETWORK

    Directory of Open Access Journals (Sweden)

    Ivan Jovanović

    2003-04-01

    Full Text Available Liver is the largest parenchymatous organ, well vascularized, weighing approximately 1.8-3.0% of the whole body weight. Among all abdominal traumas liver injuries account for 25%. For more serious liver injuries the mortality is around 40% in children below 10 years of age. For lesions of the juxtahepatic veins (three major hepatic veins or the retrohepatic portion of v. cava or for complex, combined intra abdominal injuries, the mortality is even up to 70%.This work analyzed the period 1988-2000 during which there were 19 children admitted and treated for blunt liver injuries at the Clinic of Pediatric Surgery and Orthopedics in Nis; I, II and III scale injuries prevailed (17 cases; 89.4%. These injuries were surgically treated for the most part (17 cases; 89.4%. In 7 children (36.8% there were combined injuries. The lethality was 26.3%-5 cases, with three major complications: two intrahepatic hematomas and one biliary fistula associated with biliary peritonitis and biloma formation.

  12. Paraoxonase 1 (PON1 polymorphisms, haplotypes and activity in predicting cad risk in North-West Indian Punjabis.

    Directory of Open Access Journals (Sweden)

    Nidhi Gupta

    Full Text Available Human serum paraoxonase-1 (PON1 prevents oxidation of low density lipoprotein cholesterol (LDL-C and hydrolyzes the oxidized form, therefore preventing the development of atherosclerosis. The polymorphisms of PON1 gene are known to affect the PON1 activity and thereby coronary artery disease (CAD risk. As studies are lacking in North-West Indian Punjabi's, a distinct ethnic group with high incidence of CAD, we determined PON1 activity, genotypes and haplotypes in this population and correlated them with the risk of CAD.350 angiographically proven (≥ 70% stenosis CAD patients and 300 healthy controls were investigated. PON1 activity was determined towards paraoxon (Paraoxonase; PONase and phenylacetate (Arylesterase; AREase substrates. In addition, genotyping was carried out by using multiplex PCR, allele specific oligonucleotide -PCR and PCR-RFLP methods and haplotyping was determined by PHASE software. The serum PONase and AREase activities were significantly lower in CAD patients as compared to the controls. All studied polymorphisms except L55M had significant effect on PONase activity. However AREase activity was not affected by them. In a logistic regression model, after adjustment for the conventional risk factors for CAD, QR (OR: 2.73 (1.57-4.72 and RR (OR, 16.24 (6.41-41.14 genotypes of Q192R polymorphism and GG (OR: 2.07 (1.02-4.21 genotype of -162A/G polymorphism had significantly higher CAD risk. Haplotypes L-T-G-Q-C (OR: 3.25 (1.72-6.16 and L-T-G-R-G (OR: 2.82 (1.01-7.80 were also significantly associated with CAD.In conclusion this study shows that CAD patients had lower PONase and AREase activities as compared to the controls. The coding Q192R polymorphism, promoter -162A/G polymorphism and L-T-G-Q-C and L-T-G-R-G haplotypes are all independently associated with CAD.

  13. The physiological role of AT1 receptors in the ventrolateral medulla

    Directory of Open Access Journals (Sweden)

    T. Tagawa

    2000-06-01

    Full Text Available Neurons in the rostral and caudal parts of the ventrolateral medulla (VLM play a pivotal role in the regulation of sympathetic vasomotor activity and blood pressure. Studies in several species, including humans, have shown that these regions contain a high density of AT1 receptors specifically associated with neurons that regulate the sympathetic vasomotor outflow, or the secretion of vasopressin from the hypothalamus. It is well established that specific activation of AT1 receptors by application of exogenous angiotensin II in the rostral and caudal VLM excites sympathoexcitatory and sympathoinhibitory neurons, respectively, but the physiological role of these receptors in the normal synaptic regulation of VLM neurons is not known. In this paper we review studies which have defined the effects of specific activation or blockade of these receptors on cardiovascular function, and discuss what these findings tell us with regard to the physiological role of AT1 receptors in the VLM in the tonic and phasic regulation of sympathetic vasomotor activity and blood pressure.

  14. Distribution of paraoxonase PON1 gene polymorphisms in Mexican populations. Its role in the lipid profile.

    Science.gov (United States)

    Gamboa, Ricardo; Zamora, José; Rodríguez-Pérez, José Manuel; Fragoso, José Manuel; Cardoso, Guillermo; Posadas-Romero, Carlos; Vargas-Alarcón, Gilberto

    2006-02-01

    Paraoxonase gene polymorphisms (PON1-55 and PON1-192) were determined in four Mexican populations (Mestizos, Nahuas, Teenek and Mayos) belonging to different ethnic groups. The role of these polymorphisms in the lipid profile in the Mestizo group was also analyzed. PON1 polymorphisms were determined by polymerase chain reaction-restriction fragment length polymorphism. Comparison among Mexican populations showed increased frequencies of PON1-55 L allele and LL genotype and decreased frequencies of M allele and LM genotype in the three Amerindian populations when compared to Mestizos (P < 0.05). Mexicans together with Asian populations (from Japan and China) presented the highest frequencies of PON1-55 L allele (P < 0.05 when compared to Caucasian populations). Heterogeneous data were noted when PON1-192 polymorphism comparison was made. In summary, distribution frequencies of PON1 showed that Mexican populations are more related to Asians than Caucasians. This confirms previous studies with other genetic markers indicating that Native Americans have stronger genetic affinities to the Paleolithic people of North-East Asia than to other major world populations. In Mexican Mestizos, lack of correlation between PON1 polymorphisms and lipid profile was found, corroborating previous data in other populations. The present data could be helpful to understand the distribution of these polymorphisms and its role as genetic and evolutive markers in the Amerindian populations.

  15. Adrenal medulla of AS/AGU rats: a histological and immunohistochemical study.

    Science.gov (United States)

    Al-Fayez, M A; Atteya, M; Mohamed, R A; Ahmed, A M; Alroalle, A H; Salah Khalil, M; Al-Ahmed, M; Payne, A

    2017-01-01

    The outcome of the autograft therapy for Parkinson's disease including autologous cells from adrenal medulla was disappointing. This could be attributed to the pathological process in Parkinson's disease affecting cells of the adrenal medulla. This study was performed to investigate the histopathological changes in the adrenal medulla of AS/AGU rat, a model of Parkinson's disease, in comparison with Albino Swiss (AS) rats. A total of 24 male AS rats were divided into four groups, each of 6 animals: AS W1 - AS rats aged 1 week; AS adult - AS adult rats; AS/ /AGU W1 - AS/AGU rats aged 1 week; and AS/AGU adult - AS/AGU adult rats. The rats were sacrificed and the adrenal glands were dissected and processed for histological staining with haematoxylin and eosin and periodic acid Schiff and for immunohistochemical staining for S100 protein, ubiquitin and tyrosine hydroxylase. The histological investigation of the adrenal medulla of AS/AGU rats showed vascular congestion, inflammatory cellular infiltration, pyknotic nuclei, necrotic chromaffin cells and medullary inclusion bodies. The immunohistochemical investigation of AS/AGU rats showed a statistically significant decrease in the expression of S100 protein, ubiquitin and tyrosine hydroxylase compared to AS rats. The histological and immunohistological changes in the adrenal medulla could explain the failure of outcome of adrenal autograft therapy in Parkinson's disease.

  16. The application of cost-effective lasers in coherent UDWDM-OFDM-PON aided by effective phase noise suppression methods.

    Science.gov (United States)

    Liu, Yue; Yang, Chuanchuan; Yang, Feng; Li, Hongbin

    2014-03-24

    Digital coherent passive optical network (PON), especially the coherent orthogonal frequency division multiplexing PON (OFDM-PON), is a strong candidate for the 2nd-stage-next-generation PON (NG-PON2). As is known, OFDM is very sensitive to the laser phase noise which severely limits the application of the cost-effective distributed feedback (DFB) lasers and more energy-efficient vertical cavity surface emitting lasers (VCSEL) in the coherent OFDM-PON. The current long-reach coherent OFDM-PON experiments always choose the expensive external cavity laser (ECL) as the optical source for its narrow linewidth (usuallyOFDM-PON and study the possibility of the application of the DFB lasers and VCSEL in coherent OFDM-PON. A typical long-reach coherent ultra dense wavelength division multiplexing (UDWDM) OFDM-PON has been set up. The numerical results prove that the OBE method can stand severe phase noise of the lasers in this architecture and the DFB lasers as well as VCSEL can be used in coherent OFDM-PON. In this paper, we have also analyzed the performance of the RF-pilot-aided (RFP) phase noise suppression method in coherent OFDM-PON.

  17. Intra and Inter-PON ONU to ONU Virtual Private Networking using OFDMA in a Ring Topology

    DEFF Research Database (Denmark)

    Deng, Lei; Zhao, Ying; Pang, Xiaodan

    2011-01-01

    Abstract—In this paper, we propose a novel WDM-PON architecture to support efficient and bandwidth-scalable virtual private network (VPN) emulation over both inter-PON and intra- PON. The virtual ring link for the VPN communications among ONUs is realized by using additionally low-cost optical...

  18. Somatostatin-immunoreactive nerve cell bodies and fibers in the medulla oblongata et spinalis.

    Science.gov (United States)

    Forssmann, W G; Burnweit, C; Shehab, T; Triepel, J

    1979-10-01

    Complete serial sectioning of the medulla oblongata in monkey, cat, guinea pig, and japanese dancing mouse and incubation for somatostatin-immunoreaction was carried out. Numerous regions of the medulla oblongata such as the nucleus reticularis gigantocellularis, nucleus cuneatus et gracillis, nucleus raphe magnus, nucleus tractus solitarius, nucleus vestibularis, and parts of the oliva contain dense networks of somatostatin-immunoreactive nerve fibers. Cell bodies were seen in the nucleus reticularis medullae oblongatae. In the spinal cord the sections from each segment were analyzed, showing the highest concentrations of somatostatinergic fibers in the substantia gelantinosa of the columna dorsalis. Cell bodies were seen in the zona intermedia centralis, especially in the upper cervical segments. Many positive fibers were also seen in the entire zona intermedia and the columna ventralis. Especially prominent was the immunoreactivity in the zona intermediolateralis of the thoracic segments and the columna ventralis of the lower lumbar and sacral segments.

  19. Constellation-masked secure communication technique for OFDM-PON.

    Science.gov (United States)

    Liu, Bo; Zhang, Lijia; Xin, Xiangjun; Yu, Jianjun

    2012-10-22

    This paper proposes a novel secure communication technique using constellation masking for applications in orthogonal frequency division multiplexing passive optical network (OFDM-PON). The constellation masking is applied both on each subcarrier and among different subcarriers. The Arnold mapping is utilized as the parameter function for the mask factors. A interleave length is employed to provide a scalable masking granularity for different ONUs. A 15.54 Gb/s constellation-masked 32QAM-OFDM signal has been successfully transmitted over 25-km single mode fiber in the experiment. Experimental results show that the proposed scheme can effectively protect the system from illegal ONU without wasting the bandwidth. The constellation-masked technique suggests an effective solution for the physical secure communication in future OFDM access network.

  20. Hypertensive Encephalopathy: Isolated Pons Involvement Mimicking Central Pontine Myelinolysis

    Energy Technology Data Exchange (ETDEWEB)

    Gamanagatti, S.; Subramanian, S. [India Institute of Medical Sciences, New Delhi (India)

    2006-09-15

    MRI of the brain was performed, and it demonstrated an isolated high signal on the T2 weighted and fluid attenuated inversion recovery sequences that involved only the central pons with sparing the periphery. There was no restricted diffusion on diffusion weighted imaging. The differential diagnosis included posterior reversible syndrome and central pontine myelinolysis; however, the blood sodium on admission was normal. The pathogenesis of HE is that the auto-regulatory mechanisms that control the cerebral blood flow are exceeded, resulting in hyper-perfusion. The consequent over-distension of the cerebral vessels, the breakdown of the blood brain barrier and ultimately, the extravasation of fluid into the interstitium all cause vasogenic edema. In most cases, the changes of hypertensive encephalopathy represent reversible vasogenic edema, which can be seen on T2-weighted images, and restricted diffusion is not seen on the diffusion-weighted imaging (DWI) and the apparent diffusion coefficient (ADC) maps. Hypertensive encephalopathy that manifests as a reversible increased signal isolated to the pons on T2-weighted images is extremely uncommon. The differential diagnosis for such pontine T2 hyperintensity includes pontine glioma, ischemic and radiation changes (generally irreversible conditions), as well as central pontine myelinolysis (CPM) and demyelinating disorders such as multiple sclerosis, acute disseminated encephalomyelitis and rhomb-encephalitis. In CPM electrolyte imbalances provide a clue for the diagnosis, where as for glioma, there will be an expansion and mass effect. In conclusion, clinical recognition of brainstem HE may be difficult. The features of a lack of correlation between the severity of the radiological abnormality and the clinical status, combined with the rapid resolution following antihypertensive treatment, should suggest the diagnosis. It is important for the radiologist to be familiar with the imaging abnormalities of this life

  1. ROLE OF COUNSELORS IN MOTIVATING ATHLETES GULAT WEST SUMATRA ON PON XIX

    Directory of Open Access Journals (Sweden)

    Tjung Hauw Sin

    2016-12-01

    Full Text Available Motivation is one of the most important aspects of sports coaching program. Various facilities for athletes overcoming psychological problems should be held, including counseling program conducted by professional counselors. Athletes sports wrestling West Sumatra PON XIX get motivation increases with counseling by a counselor and motivator of the team during the preparation and training, so we get the result of increased achievement and medal counts for PON XIX. The results showed that counseling provides a constructive role to increase the motivation of athletes wrestling West Sumatra PON XIX.

  2. The best source of isolated stromal cells for the artificial ovary: medulla or cortex, cryopreserved or fresh?

    Science.gov (United States)

    Soares, M; Sahrari, K; Chiti, M C; Amorim, C A; Ambroise, J; Donnez, J; Dolmans, M-M

    2015-07-01

    What is the best source of ovarian cells for the artificial ovary: medulla or cortex, cryopreserved or fresh? Ovarian cells from fresh medullary tissue, which can be isolated in larger numbers, show higher viability and are able to improve graft vascularization. In a previous study, addition of endothelial cells along with ovarian cells was found to be crucial for formation of a well-vascularized ovary-like structure. This study is the first to evaluate both the effect of cryopreservation and the source of ovarian tissue on isolated ovarian cells. Prospective experimental study in an academic research unit using ovarian tissue from seven patients undergoing surgery for benign gynecologic disease. Ovarian tissue was retrieved from seven patients, with one half processed as fresh (fresh group) and the other half frozen and thawed before processing (frozen group). In each group, ovarian cells from the cortex and medulla were isolated separately, and their viability was tested using a calcein AM/ethidium homodimer viability assay. Fifty thousand cells were then encapsulated in fibrin and grafted to peritoneal pockets in nude mice (14 in all). Grafts recovered after 7 days were analyzed by immunohistochemistry for the presence of ovarian cells (vimentin), proliferation (Ki67) and graft vascularization (double CD34). Cell apoptosis was analyzed by TUNEL assay. Cryopreservation decreased ovarian cell yield (-2804 cells/mg, P = 0.015) and viability (-9.72%, P = 0.052) before grafting and had a considerable (5-fold, P = 0.2) but non-significant negative impact on ovarian cell presence in grafts. The medulla yielded many more cells (+3841 cells/mg, P Scientifique de Belgique (5/4/150/5 and 7.4518.12F), Fonds Spéciaux de Recherche, Fondation Saint Luc and Foundation Against Cancer, and donations from Mr Pietro Ferrero, Baron Frère and Viscount Philippe de Spoelberch. None of the authors have any conflicting interests to declare. © The Author 2015. Published by Oxford

  3. Effects of Adrenal Medulla and Sciatic Nerve Co-Grafts in Rats with Unilateral Substantia Nigra Lesions

    Science.gov (United States)

    Freed, William J.; Willingham, George; Heim, Robert

    1992-01-01

    Major limitations of adrenal medulla transplantation in animal models of Parkinson's disease have been the relatively small behavioral effects and the poor or inconsistent graft survival. Transplantation of fragments of sural nerve in combination with adrenal medulla has been reported to increase the survival of chromaffin cells in adrenal medulla grafts in primates. In the present study, the possibility was tested that peripheral nerve co-grafts would increase the functional effects of adrenal medulla grafts in a 6-hydroxydopamine-lesioned rat model. Animals received unilateral substantia nigra lesions, and subsequently received intraventricular grafts of adrenal medulla, sciatic nerve, adrenal medulla plus sciatic nerve, or sham grafts consisting of medium only. Functional effects of the grafts were tested using apomorphine-induced rotational behavior. The sciatic nerve co-grafts did not increase the survival of TH-immunoreactive chromaffin cells. The co-grafting treatment also did not augment the overall effect of adrenal medulla grafts on rotational behavior. In the animals with substantial numbers of surviving chromaffin cells, however, the animals with sciatic nerve co-grafts showed greater decreases in rotational behavior as compared to the animals with adrenal medulla grafts alone, even though the number of surviving cells was not increased. PMID:1355367

  4. Expression of human paraoxonase 1 decreases superoxide levels and alters bacterial colonization in the gut of Drosophila melanogaster.

    Directory of Open Access Journals (Sweden)

    Alejandro A Pezzulo

    Full Text Available Paraoxonases (PON are a family of proteins (PON1, 2 and 3 with multiple enzymatic activities. PON1 interferes with homoserine lactone-mediated quorum sensing in bacteria and with reactive oxygen species (ROS in humans and mice. PON1 gene mutations have been linked to multiple traits, including aging, and diseases of the cardiovascular, nervous and gastrointestinal system. The overlapping enzymatic activities in the PON family members and high linkage disequilibrium rates within their polymorphisms confound animal and human studies of PON1 function. In contrast, arthropods such as Drosophila melanogaster have no PON homologs, resulting in an ideal model to study interactions between PON genotype and host phenotypes. We hypothesized that expression of PON1 in D. melanogaster would alter ROS. We found that PON1 alters expression of multiple oxidative stress genes and decreases superoxide anion levels in normal and germ-free D. melanogaster. We also found differences in the composition of the gut microbiota, with a remarkable increase in levels of Lactobacillus plantarum and associated changes in expression of antimicrobial and cuticle-related genes. PON1 expression directly decreased superoxide anion levels and altered bacterial colonization of the gut and its gene expression profile, highlighting the complex nature of the interaction between host genotype and gut microbiota. We speculate that the interaction between some genotypes and human diseases may be mediated by the presence of certain gut bacteria that can induce specific immune responses in the gut and other host tissues.

  5. Neurotrophic requirements of rat embryonic catecholaminergic neurons from the rostral ventrolateral medulla

    NARCIS (Netherlands)

    Copray, JCVM; Gibbons, H; van Roon, WMC; Comer, AM; Lipski, J

    1999-01-01

    The factors that regulate the ontogeny and differentiation of C1 adrenergic neurons located in the rostral ventrolateral medulla (RVLM) are completely unknown. In the present study, we have investigated the effects of a number of neurotrophic factors on the survival of E18-19 rat C1 adrenergic

  6. Energy-efficient WDM-OFDM-PON employing shared OFDM modulation modules in optical line terminal

    National Research Council Canada - National Science Library

    Hu, Xiaofeng; Zhang, Liang; Cao, Pan; Wang, Kongtao; Su, Yikai

    2012-01-01

    We propose and experimentally demonstrate a scheme to improve the energy efficiency of wavelength division multiplexing - orthogonal frequency division multiplexing - passive optical networks (WDM-OFDM-PONs). By using an N...

  7. Isolated pons involvement in Posterior Reversible Encephalopathy Syndrome: Case report and review of the literature

    Directory of Open Access Journals (Sweden)

    Mariangela Ferrara

    2017-03-01

    Conclusions: Though isolated infratentorial involvement in PRES recognizes several causes, hypertension, which is a common feature in Turner syndrome, would have played a key role in our case with solely pons MRI T2-hyperintensity.

  8. Alkali metals levels in the human brain tissue: Anatomical region differences and age-related changes.

    Science.gov (United States)

    Ramos, Patrícia; Santos, Agostinho; Pinto, Edgar; Pinto, Nair Rosas; Mendes, Ricardo; Magalhães, Teresa; Almeida, Agostinho

    2016-12-01

    The link between trace elements imbalances (both "toxic" and "essential") in the human brain and neurodegenerative disease has been subject of extensive research. More recently, some studies have highlighted the potential role of the homeostasis deregulation of alkali metals in specific brain regions as key factor in the pathogenesis of neurodegenerative diseases such as multiple sclerosis and Alzheimer's disease. Using flame atomic emission spectrometry and inductively coupled plasma-mass spectrometry after microwave-assisted acid digestion of the samples, alkali metals (Na, K, Li, Rb and Cs) were determined in 14 different areas of the human brain (frontal cortex, superior and middle temporal gyri, caudate nucleus, putamen, globus pallidus, cingulated gyrus, hippocampus, inferior parietal lobule, visual cortex of the occipital lobe, midbrain, pons, medulla and cerebellum) of adult individuals (n=42; 71±12, range: 50-101 years old) with no known history and evidence of neurodegenerative, neurological or psychiatric disorder. Potassium was found as the most abundant alkali metal, followed by Na, Rb, Cs and Li. Lithium, K and Cs distribution showed to be quite heterogeneous. On the contrary, Rb and Na appeared quite homogeneously distributed within the human brain tissue. The lowest levels of Na, K, Rb and Li were found in the brainstem (midbrain, medulla and pons) and cerebellum, while the lowest levels of Cs were found in the frontal cortex. The highest levels of K (mean±sd; range 15.5±2.5; 8.9-21.8mg/g) Rb (17.2±6.1; 3.9-32.4μg/g and Cs (83.4±48.6; 17.3-220.5ng/g) were found in putamen. The highest levels of Na and Li were found in the frontal cortex (11.6±2.4; 6.6-17.1mg/g) and caudate nucleus (7.6±4.6 2.2-21.3ng/g), respectively. Although K, Cs and Li levels appear to remain largely unchanged with age, some age-related changes were observed for Na and Rb levels in particular brain regions (namely in the hippocampus). Copyright © 2016 Elsevier GmbH. All

  9. Autoradiographic localization of /sup 3/H-digoxin binding by neural cells in the medulla

    Energy Technology Data Exchange (ETDEWEB)

    Traurig, H.H.; Bhagat, A.; Bass, N.H.

    1985-01-01

    The purpose of this investigation was to localize binding sites for the cardiac glycoside digoxin in the medulla of the rat in vivo. Adult male Sprague-Dawley rats were injected (IV) with /sup 3/H-digoxin and killed 30 minutes later. Autoradiographs of medullas showed evidence of /sup 3/H-digoxin binding to small- and medium-sized neural cells in the regions of the nucleus solitarius, dorsal motor nucleus of the vagus, area postrema, and in the zone between the area postrema and the underlying neuropil. However, the parasympathetic preganglionic neurons of the dorsal motor nucleus were not labeled. The /sup 3/H-digoxin-labeled cells in the medulla were located mainly in the commissural and medial portions of nucleus solitarius at the level of the area postrema. Animals injected with unlabeled digoxin followed by /sup 3/H-digoxin showed reduced binding of radioactivity. The small- and medium-sized neurons of the caudal portions of the nucleus solitarius are internuncial in position with respect to cardiovascular afferents of the glossopharyngeal and vagus nerves and sympathetic and parasympathetic cardiovascular efferent neurons of the medulla. The results of this study suggest that these /sup 3/H-digoxin-labeled cells, presumably neurons of nucleus solitarius, may possess high affinity binding sites for digoxin. Further, the area postrema, which lacks a blood-brain barrier, may provide a portal of entry for /sup 3/H-digoxin into regions of the medulla known to contain neurons that play a role in the regulation of cardiac rhythm.

  10. Remotely controllable WDM-PON technology for wireless fronthaul/backhaul application

    DEFF Research Database (Denmark)

    Eiselt, Michael H.; Wagner, Christoph; Lawin, Mirko

    2016-01-01

    Low-cost WDM-PON solutions for fronthaul and backhaul applications will include remotely controlled tail-end transceivers. We report on control aspects of these transceivers and how standardization is evolving to enable these applications.......Low-cost WDM-PON solutions for fronthaul and backhaul applications will include remotely controlled tail-end transceivers. We report on control aspects of these transceivers and how standardization is evolving to enable these applications....

  11. Bi-directional 120 km long-reach PON link based on distributed Raman amplification

    DEFF Research Database (Denmark)

    Kjær, Rasmus; Tafur Monroy, Idelfonso; Oxenløwe, Leif Katsuo

    2006-01-01

    We propose and demonstrate a bidirectional PON link with 120 km reach and symmetric up and down stream data rate of 10 Gbit/s. Lossless transmission was achieved with >40 dB of received OSNR......We propose and demonstrate a bidirectional PON link with 120 km reach and symmetric up and down stream data rate of 10 Gbit/s. Lossless transmission was achieved with >40 dB of received OSNR...

  12. Physiotherapeutic Procedure for Patient after Ischemic Cerebrovascular Accident (Stroke) in The Pons

    OpenAIRE

    Alrasheed, Abdulaziz Abdullah A

    2017-01-01

    Title of thesis: Physiotherapeutic Procedure for Patient after Ischemic Cerebrovascular Accident (Stroke) in The Pons. Author: Abdulaziz Abdullah Alrasheed. Work placement: Oblastní Nemocnice Kladno Summary: In the thesis, I will be covering a case study diagnosed with ischemic cerebrovascular accident (stroke) in the pons. It will be divided into 2 parts ( General - Practical) The general part explains the anatomical, biomechanical ,physiological and neurophysiological point view of the brai...

  13. 10 Gb/s Real-Time All-VCSEL Low Complexity Coherent scheme for PONs

    DEFF Research Database (Denmark)

    Rodes Lopez, Roberto; Cheng, Ning; Jensen, Jesper Bevensee

    2012-01-01

    Real time demodulation of a 10 Gb/s all-VCSEL based coherent PON link with a simplified coherent receiver scheme is demonstrated. Receiver sensitivity of −33 dBm is achieved providing high splitting ratio and link reach.......Real time demodulation of a 10 Gb/s all-VCSEL based coherent PON link with a simplified coherent receiver scheme is demonstrated. Receiver sensitivity of −33 dBm is achieved providing high splitting ratio and link reach....

  14. Epigenetic patterns of two gene promoters (TNF-α and PON) in stroke considering obesity condition and dietary intake.

    Science.gov (United States)

    Gómez-Uriz, A M; Goyenechea, E; Campión, J; de Arce, A; Martinez, M T; Puchau, B; Milagro, F I; Abete, I; Martínez, J A; Lopez de Munain, A

    2014-06-01

    Some causal bases of stroke remain unclear, but the nutritional effects on the epigenetic regulation of different genes may be involved. The aim was to assess the impact of epigenetic processes of human tumor necrosis factor (TNF-α) and paraoxonase (PON) promoters in the susceptibility to stroke when considering body composition and dietary intake. Twenty-four patients (12 non-stroke/12 stroke) were matched by sex (12 male/12 female), age (mean 70 ± 12 years old), and BMI (12 normal-weight/12 obese; mean 28.1 ± 6.7 kg/m(2)). Blood cell DNA was isolated and DNA methylation levels of TNF-α (-186 to +349 bp) and PON (-231 to +250 bp) promoters were analyzed by the Sequenom EpiTYPER approach. Histone modifications (H3K9ac and H3K4me3) were analyzed also by chromatin immunoprecipitation in a region of TNF-α (-297 to -185). Total TNF-α promoter methylation was lower in stroke patients (p obesity outcome, respectively. The dietary intake and body composition may influence this epigenetic regulation in non-stroke patients.

  15. PONS - Mobility Assistance on Footpaths for Public Transportation.

    Science.gov (United States)

    Koutny, Reinhard; Miesenberger, Klaus

    2015-01-01

    This paper presents an ongoing project targeting mobility support for users of public transportation including people with limited mobility. Existing approaches in this field mostly offer non-continuous guidance during the whole journey including multiple rides with different vehicles and footpaths in between at transfer points. Especially people with limited mobility, like people with disabilities and elderly people, or travelers who are not familiar with the specific route or transfer point, like tourists, often struggle with public transportation. They crave for a seamless approach covering all links of the mobility chain - the sequence of sections of the whole route - and providing comprehensive assistance throughout the whole journey. Previous projects and widespread experiences of project partners revealed that especially footpath sections are lacking proper support. In particular, the consortium identified three problem areas in existing approaches when dealing with footpath sections: (1) A lack of information, (2) a lack of orientation and (3) a lack of provision of services. In order to bridge (lat. PONS) these gaps in the mobility chain, new paradigms and technology concepts are developed to tackle the shortcomings on footpaths and combined in a toolkit to help developers of applications with focus on pedestrian navigation and public transport to improve their solutions with sustainable and state-of-the-art approaches.

  16. Intra and Inter-PON ONU to ONU Virtual Private Networking using OFDMA in a Ring Topology

    OpenAIRE

    Deng, Lei; Zhao, Ying; Pang, Xiaodan; Yu, Xianbin; Liu, Deming; Tafur Monroy, Idelfonso

    2011-01-01

    Abstract—In this paper, we propose a novel WDM-PON architecture to support efficient and bandwidth-scalable virtual private network (VPN) emulation over both inter-PON and intra- PON. The virtual ring link for the VPN communications among ONUs is realized by using additionally low-cost optical passive components and OFDMA technology. Moreover, the downstream traffic wavelength is reused for the upstream traffic signal by using re-modulation technology. We report on a successful transmission o...

  17. Autopsy case of undiagnosed gangliocytoma in the medulla oblongata complicated with cerebral palsy.

    Science.gov (United States)

    Takahashi, Motonori; Kondo, Takeshi; Morichika, Mai; Kuse, Azumi; Nakagawa, Kanako; Asano, Migiwa; Ueno, Yasuhiro

    2016-03-01

    A Japanese man in his 30s who had congenital cerebral palsy was found unresponsive in bed. His death was confirmed after resuscitation attempts. He had a history of occasional falling (despite the use of walking sticks and a wheelchair) owing to a slowly progressive gait disturbance, and had a medical examination without full neurological re-examination. Autopsy revealed gangliocytoma in the medulla oblongata, which was diagnosed as the cause of death. Although gangliocytoma is a well-differentiated benign tumor, the almost total replacement of the medulla oblongata by the tumor cells was assumed to result in ataxia via the olivocerebellar tract and secondary cerebellar atrophy, followed by central hypoventilation and death of the patient. The symptoms caused by gangliocytoma may be overlooked owing to long-standing cerebral palsy. Copyright © 2015 Elsevier Ireland Ltd. All rights reserved.

  18. Thymic crosstalk coordinates medulla organization and T-cell tolerance induction

    Directory of Open Access Journals (Sweden)

    Noëlla eLopes

    2015-07-01

    Full Text Available The thymus ensures the generation of a functional and highly diverse T-cell repertoire. The thymic medulla, which is mainly composed of medullary thymic epithelial cells (mTECs and dendritic cells (DCs, provides a specialized microenvironment dedicated to the establishment of T-cell tolerance. mTECs play a privileged role in this pivotal process by their unique capacity to express a broad range of peripheral self-antigens that are presented to developing T cells. Reciprocally, developing T cells control mTEC differentiation and organization. These bidirectional interactions are commonly referred to as thymic crosstalk. This review focuses on the relative contributions of mTEC and DC subsets to the deletion of autoreactive T cells and the generation of natural regulatory T cells. We also summarize current knowledge regarding how hematopoietic cells control the composition and complex three-dimensional organization of the thymic medulla.

  19. The relationship of PON1 QR 192 and LM 55 polymorphisms with serum paraoxonase activities of Turkish diabetic patients.

    Science.gov (United States)

    Altuner, Durdu; Ates, Ilker; Suzen, Sinan H; Koc, Gonul Varan; Aral, Yalcin; Karakaya, Asuman

    2011-11-01

    Paraoxonase (PON1) is a serum esterase responsible for the protection against xenobiotics toxicity such as paraoxon. Alterations in PON1 concentrations have been reported in a variety of diseases including diabetes mellitus (DM). It has been shown that the serum PON1 concentration and activity are decreased in patients with both type 1 and type 2 DM. This study aimed to investigate the lipid profiles and the relationship between PON1 activity and PON1, QR192 and LM55 polymorphisms in Turkish type 2 diabetic patients and non-diabetic control subjects. According to our results, RR variant had significantly higher PON activity than QQ and QR variants (p < 0.01) and LL variant had significantly higher PON activity than MM variant in both control and patient groups (p < 0.05). In conclusion, we found that PON1 192RR and 55LL genotypes are associated with higher PON activity than QQ and MM genotypes. This may be more protective to lipid peroxidation.

  20. Measurement of serum PON-3 concentration: method evaluation, reference values, and influence of genotypes in a population-based study.

    Science.gov (United States)

    Aragonès, Gerard; Guardiola, Marta; Barreda, María; Marsillach, Judit; Beltrán-Debón, Raúl; Rull, Anna; Mackness, Bharti; Mackness, Michael; Joven, Jorge; Simó, Josep M; Camps, Jordi

    2011-05-01

    Experimental studies showed that paraoxonase-3 (PON3) retards lipoprotein oxidation. Our objective was to describe a new assay to measure serum PON3 concentrations and report their reference values in a population-based study. The influence of PON3 promoter polymorphisms and their relationships with PON1 and lipid profile were also studied. We generated an anti-PON3 antibody by inoculating rabbits with a synthetic peptide specific to mature PON3. This antibody was used to develop an ELISA. The average regression line of standard plots (n = 8) was y = 0.9587 (0.3392) log(10)x + 1.9466 (0.0861) [r(2) = 0.924 (0.0131); P concentrations showed a moderate influence (about 10% variation) by PON3 promoter polymorphisms. Our study describes for the first time a method to measure serum PON3 concentrations. This method offers new opportunities in the investigation of the properties and role of PON3 in cardiovascular disease, with possible implications in clinical practice.

  1. Asthma pregnancy alters postnatal development of chromaffin cells in the rat adrenal medulla.

    Directory of Open Access Journals (Sweden)

    Xiu-Ming Wu

    Full Text Available BACKGROUND: Adrenal neuroendocrine plays an important role in asthma. The activity of the sympathoadrenal system could be altered by early life events. The effects of maternal asthma during pregnancy on the adrenal medulla of offspring remain unknown. METHODOLOGY/PRINCIPAL FINDINGS: This study aims to explore the influence of maternal asthma during pregnancy on the development and function of adrenal medulla in offspring from postnatal day 3 (P3 to postnatal day 60 (P60. Asthmatic pregnant rats (AP, nerve growth factor (NGF-treated pregnant rats (NP and NGF antibody-treated pregnant rats (ANP were sensitized and challenged with ovalbumin (OVA; NP and ANP were treated with NGF and NGF antibody respectively. Offspring rats from the maternal group were divided into four groups: offspring from control pregnant rats (OCP, offspring from AP (OAP, offspring from NP (ONP, and offspring from ANP (OANP. The expressions of phenylethanolamine N-methyltransferase (PNMT protein in adrenal medulla were analyzed. The concentrations of epinephrine (EPI, corticosterone and NGF in serum were measured. Adrenal medulla chromaffin cells (AMCC were prone to differentiate into sympathetic nerve cells in OAP and ONP. Both EPI and PNMT were decreased in OAP from P3 to P14, and then reached normal level gradually from P30 to P60, which were lower from birth to adulthood in ONP. Corticosterone concentration increased significantly in OAP and ONP. CONCLUSION/SIGNIFICANCE: Asthma pregnancy may promote AMCC to differentiate into sympathetic neurons in offspring rats and inhibit the synthesis of EPI, resulting in dysfunction of bronchial relaxation.

  2. Nitric oxide producing neurones in the rat medulla oblongata that project to nucleus tractus solitarii.

    Science.gov (United States)

    Esteves, F O; McWilliam, P N; Batten, T F

    2000-11-01

    The production of nitric oxide in neurones of the rat medulla oblongata that project to the nucleus tractus solitarii (NTS) was examined by simultaneous immunohistochemical detection of nitric oxide synthase (NOS) and of cholera toxin B-subunit (CTb), which was injected into the caudal zone of the NTS. Neurones immunoreactive for CTb and neurones immunoreactive for NOS were widely co-distributed and found in almost all the anatomical divisions of the medulla. Dual-labelled cells, containing both CTb and NOS immunoreactivities were more numerous ipsilaterally to the injection sites. They were concentrated principally in the more rostral zone of the NTS, raphé nuclei, dorsal, intermediate and lateral reticular areas, spinal trigeminal and paratrigeminal nuclei and the external cuneate and medial vestibular nuclei. Isolated dual-labelled neurones were also scattered throughout most of the divisions of the reticular formation. These observations indicate that many areas of the medulla that are known to relay somatosensory and viscerosensory inputs contain NOS immunoreactive neurones that project to the NTS, and may, therefore, contribute to the dense NOS-immunoreactive innervation of the NTS. The release of nitric oxide from the axon terminals of these neurones may modulate autonomic responses generated by NTS neurones in relation to peripheral sensory stimuli, and thus ultimately regulate sympathetic and/or parasympathetic outflow.

  3. Complete medulla/cervical spinal cord transection after atlanto-occipital dislocation: an extraordinary case.

    Science.gov (United States)

    Gautschi, O P; Woodland, P R; Zellweger, R

    2007-05-01

    Case report. Traumatic atlanto-occipital dislocation (AOD) with a complete medulla/spinal cord transection is rare and believed to be fatal owing to the high level of the spinal cord injury. Clinical outcome is poor. Consequently, relatively few case reports of adult patients surviving this injury appear in the literature. OBJECTIVES AND RESULT: We present the case of a 20-year-old male, who sustained an AOD with a complete medulla/spinal cord transection in a motorcycle accident to discuss the possibility of long-term survival with this condition. The patient underwent occipito-cervical stabilization. With an Injury Severity Score of 75, by definition unsurvivable, the patient is 16 months after the injury, ventilated and fully dependent for all care. Long-term survival following AOD with a complete medulla/spinal cord transection is possible if immediate resuscitation at the scene is available. Nevertheless, it remains questionable whether or not a patient with such a devastating injury and without any prospect of functional recovery should be kept alive under all circumstances.

  4. Diagnosis of AFP-negative early-stage hepatocellular carcinoma using Fuc-PON1.

    Science.gov (United States)

    Shu, Hong; Li, Wei; Shang, Shuxin; Qin, Xue; Zhang, Shu; Liu, Yinkun

    2017-03-01

    Our previous study demonstrated that Fuc-PON1 (the ratio of fucosylated serum paraoxonase 1 to the total serum serum paraoxonase 1) was increased significantly in hepatocellular carcinoma (HCC) patients with low AFP levels. Herein, a separate cohort of AFP-negative (AFP(-)) early HCC patients was studied to validate the diagnostic potential of Fuc-PON1. Aleuria aurantia lectin (AAL) ELISA and protein ELISA were measured simultaneously to calculate PON1 fucosylation at its protein level. Lens culinaris agglutinin reactive AFP (AFP-L3) and glypican-3 (GPC3) concentrations of the same specimens were also evaluated. The AUC was 0.78 (95% CI 0.704 to 0.852) for Fuc-PON1, with sensitivity of 62.2%, specificity of 67.7%, and accuracy of 64.5%. However, concentration alterations of AFP-L3 and GPC3 in AFP(-)HCC patients were not remarkable. The results of the present study provided confirmed evidences for clinical application of Fuc-PON1, which demonstrated its superior diagnosis potential for distinguishing AFP(-) early HCC from AFP(-) liver cirrhosis (LC) patients.

  5. PON-Sol: prediction of effects of amino acid substitutions on protein solubility.

    Science.gov (United States)

    Yang, Yang; Niroula, Abhishek; Shen, Bairong; Vihinen, Mauno

    2016-07-01

    Solubility is one of the fundamental protein properties. It is of great interest because of its relevance to protein expression. Reduced solubility and protein aggregation are also associated with many diseases. We collected from literature the largest experimentally verified solubility affecting amino acid substitution (AAS) dataset and used it to train a predictor called PON-Sol. The predictor can distinguish both solubility decreasing and increasing variants from those not affecting solubility. PON-Sol has normalized correct prediction ratio of 0.491 on cross-validation and 0.432 for independent test set. The performance of the method was compared both to solubility and aggregation predictors and found to be superior. PON-Sol can be used for the prediction of effects of disease-related substitutions, effects on heterologous recombinant protein expression and enhanced crystallizability. One application is to investigate effects of all possible AASs in a protein to aid protein engineering. PON-Sol is freely available at http://structure.bmc.lu.se/PON-Sol The training and test data are available at http://structure.bmc.lu.se/VariBench/ponsol.php mauno.vihinen@med.lu.se Supplementary data are available at Bioinformatics online. © The Author 2016. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oup.com.

  6. miR-375 negatively regulates the synthesis and secretion of catecholamines by targeting Sp1 in rat adrenal medulla.

    Science.gov (United States)

    Gai, Yedan; Zhang, Jinglin; Wei, Chao; Cao, Wei; Cui, Yan; Cui, Sheng

    2017-05-01

    The adrenal gland is an important endocrine gland in balancing homeostasis and the response to stress by synthesizing and secreting catecholamines (CATs), and it has been confirmed that microRNA-375 (miR-375) is highly expressed in adrenal medulla. However, up to now there are few reports about the functions and related mechanisms in adrenal medulla. The present study was thus designed to study the roles and related mechanisms in rat adrenal medulla. Our results showed that miR-375 was specifically expressed in rat adrenal medulla chromaffin cells, and its expression was downregulated when rats were exposed to stress. The further functional studies demonstrated that the inhibition of endogenous miR-375 induced the secretion of CATs in primary rat medulla chromaffin cells and PC12 cells, whereas miR-375 overexpression resulted in a decline of CAT secretion. In addition, our results showed that miR-375 negatively regulated tyrosine hydroxylase (TH) and dopamine-β-hydroxylase (DBH) and mediated adrenomedullary CAT biosynthesis. These functions of miR-375 were accomplished by its binding to the 3'-untranslated region of Sp1, which was involved in the regulation of TH and DBH expressions. These novel findings suggest that miR-375 acts as a potent negative mediator in regulating the synthesis and secretion of CATs in the adrenal medulla during the maintenance of homeostasis under stress. Copyright © 2017 the American Physiological Society.

  7. Paraoxonase (PON)-1 activity in overweight and obese children and adolescents: association with obesity-related inflammation and oxidative stress.

    Science.gov (United States)

    Krzystek-Korpacka, Małgorzata; Patryn, Eliza; Hotowy, Katarzyna; Czapińska, Elżbieta; Majda, Jacek; Kustrzeba-Wójcicka, Irena; Noczyńska, Anna; Gamian, Andrzej

    2013-01-01

    Paraoxonase-1 (PON1) is a HDL-attached extracellular esterase which is believed to contribute to the anti-atherogenic and anti-inflammatory properties of HDL. A decrease in PON1 is a risk factor for cardiovascular disease and has recently been found to be associated with juvenile obesity. The issue of a possible association between enzyme activity and/or its phenotype distribution and obesity-related metabolic abnormalities, inflammation, and oxidative stress has not been addressed yet. To evaluate PON1 activity and phenotype distribution with respect to obesity and obesity-related metabolic disorders, inflammation and oxidative stress in children and adolescents. PON1 arylesterase activity was measured spectrophotometrically in 156 children and adolescents (47 lean, 27 overweight and 82 obese). Enzyme phenotype was determined using dual substrate (phenyl acetate/paraoxon) method. PON1 activity and phenotype distribution were related to the presence of obesity, metabolic syndrome, insulin resistance, hyperinsulinemia, hypertriglyceridemia, high blood pressure, low HDL level, impaired fasting glucose and/or glucose tolerance as well as inflammatory and oxidative stress indices. PON1 arylesterase activity decreased in general and central obesity, high blood pressure, and hyperinsulinemia conditions and correlated with BMI, CRP, adipocyte fatty acid-binding protein, superoxide dismutase, catalase, glutathione peroxidase, free thiols, and HOMA in a gender-dependent manner. PON1 decreases were independently associated with central obesity in girls, explaining 17% in PON1 variability, and with elevated CRP in boys, explaining 12% in its variability. PON1 phenotype was not associated with frequency of metabolic abnormalities. PON1 decreases in central obesity, exacerbating obesity-related inflammation and oxidative stress. The enzyme associations are gender-dependent: obesity and oxidative stress affects PON1 in girls whereas inflammation in boys.

  8. Regional brain distribution of toluene in rats and in a human autopsy

    Energy Technology Data Exchange (ETDEWEB)

    Ameno, Kiyoshi; Kiriu, Takahiro; Fuke, Chiaki; Ameno, Setsuko; Shinohara, Toyohiko; Ijiri, Iwao (Kagawa Medical School (Japan). Dept. of Forensic Medicine)

    1992-02-01

    Toluene concentrations in 9 brain regions of acutely exposed rats and that in 11 brain regions of a human case who inhaled toluene prior to death are described. After exposure to toluene by inhalation (2000 or 10 000 ppm) for 0.5 h or by oral dosing (400 mg/kg.), rats were killed by decapitation 0.5 and 4 h after onset of inhalation and 2 and 10 h after oral ingestion. After each experimental condition the highest range of brain region/blood toluene concentration ratio (BBCR) was in the brain stem regions (2.85-3.22) such as the pons and medulla oblongata, the middle range (1.77-2.12) in the midbrain, thalamus, caudate-putamen, hypothalamus and cerebellum, and the lowest range (1.22-1.64) in the hippocampus and cerebral cortex. These distribution patterns were quite constant. Toluene concentration in various brain regions were unevenly distributed and directly related blood levels. In a human case who had inhaled toluene vapor, the distribution among brain regions was relatively similar to that in rats, the highest concentration ratios being in the corpus callosum (BBCR:2.66) and the lowest in the hippocampus (BBCR:1.47). (orig.).

  9. Security scheme in IMDD-OFDM-PON system with the chaotic pilot interval and scrambling

    Science.gov (United States)

    Chen, Qianghua; Bi, Meihua; Fu, Xiaosong; Lu, Yang; Zeng, Ran; Yang, Guowei; Yang, Xuelin; Xiao, Shilin

    2018-01-01

    In this paper, a random chaotic pilot interval and permutations scheme without any requirement of redundant sideband information is firstly proposed for the physical layer security-enhanced intensity modulation direct detection orthogonal frequency division multiplexing passive optical network (IMDD-OFDM-PON) system. With the help of the position feature of inserting the pilot, a simple logistic chaos map is used to generate the random pilot interval and scramble the chaotic subcarrier allocation of each column pilot data for improving the physical layer confidentiality. Due to the dynamic chaotic permutations of pilot data, the enhanced key space of ∼103303 is achieved in OFDM-PON. Moreover, the transmission experiment of 10-Gb/s 16-QAM encrypted OFDM data is successfully demonstrated over 20-km single-mode fiber, which indicates that the proposed scheme not only improves the system security, but also can achieve the same performance as in the common IMDD-OFDM-PON system without encryption scheme.

  10. Chaos-based CAZAC scheme for secure transmission in OFDM-PON

    Science.gov (United States)

    Fu, Xiaosong; Bi, Meihua; Zhou, Xuefang; Yang, Guowei; Lu, Yang; Hu, Miao

    2018-01-01

    To effectively resist malicious eavesdropping and performance deterioration, a novel chaos-based secure transmission scheme is proposed to enhance the physical layer security and reduce peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing passive optical network (OFDM-PON). By the randomly extracting operation of common CAZAC values, the specially-designed constant amplitude zero autocorrelation (CAZAC) is created for system encryption and PAPR reduction enhancing the transmission security. This method is verified in {10-Gb/s encrypted OFDM-PON with 20-km fiber transmission. Results show that, compared to common OFDM-PON, our scheme achieves {3-dB PAPR reduction and {1-dB receiver sensitivity improvement.

  11. Energy-efficient WDM-OFDM-PON employing shared OFDM modulation modules in optical line terminal.

    Science.gov (United States)

    Hu, Xiaofeng; Zhang, Liang; Cao, Pan; Wang, Kongtao; Su, Yikai

    2012-03-26

    We propose and experimentally demonstrate a scheme to improve the energy efficiency of wavelength division multiplexing - orthogonal frequency division multiplexing - passive optical networks (WDM-OFDM-PONs). By using an N × M opto-mechanic switch in optical line terminal (OLT), an OFDM modulation module is shared by several channels to deliver data to multiple users with low traffic demands during non-peak hours of the day, thus greatly reducing the number of operating devices and minimizing the energy consumption of the OLT. An experiment utilizing one OFDM modulation module to serve three optical network units (ONUs) in a WDM-OFDM-PON is performed to verify the feasibility of our proposal. Theoretical analysis and numerical calculation show that the proposed scheme can achieve a saving of 23.6% in the energy consumption of the OFDM modulation modules compared to conventional WDM-OFDM-PON.

  12. Midline section of the medulla abolishes inspiratory activity and desynchronizes pre-inspiratory neuron rhythm on both sides of the medulla in newborn rats.

    Science.gov (United States)

    Onimaru, Hiroshi; Tsuzawa, Kayo; Nakazono, Yoshimi; Janczewski, Wiktor A

    2015-04-01

    Each half of the medulla contains respiratory neurons that constitute two generators that control respiratory rhythm. One generator consists of the inspiratory neurons in the pre-Bötzinger complex (preBötC); the other, the pre-inspiratory (Pre-I) neurons in the parafacial respiratory group (pFRG), rostral to the preBötC. We investigated the contribution of the commissural fibers, connecting the respiratory rhythm generators located on the opposite side of the medulla to the generation of respiratory activity in brain stem-spinal cord preparation from 0- to 1-day-old rats. Pre-I neuron activity and the facial nerve and/or first lumbar (L1) root activity were recorded as indicators of the pFRG-driven rhythm. Fourth cervical ventral root (C4) root and/or hypoglossal (XII) nerve activity were recorded as indicators of preBötC-driven inspiratory activity. We found that a midline section that interrupted crossed fibers rostral to the obex irreversibly eliminated C4 and XII root activity, whereas the Pre-I neurons, facial nerve, and L1 roots remained rhythmically active. The facial and contralateral L1 nerve activities were synchronous, whereas right and left facial (and right and left L1) nerves lost synchrony. Optical recordings demonstrated that pFRG-driven burst activity was preserved after a midline section, whereas the preBötC neurons were no longer rhythmic. We conclude that in newborn rats, crossed excitatory interactions (via commissural fibers) are necessary for the generation of inspiratory bursts but not for the generation of rhythmic Pre-I neuron activity. Copyright © 2015 the American Physiological Society.

  13. Study of converged 60 GHz radio over fiber with WDM-PON access networks

    OpenAIRE

    Shao, Tong

    2012-01-01

    Recently, convergence of 60 GHz radio over fiber (RoF) technique with wavelength division multiplexing (WDM) passive optical networks (PON) has raised great interests because it provides the possibility for simultaneous broadband 60 GHz signal generation and multi-gigabit per second wireline transmission. The objective of the thesis is to study the solutions for converged 60 GHz RoF and WDM-PON technique.In this thesis, we have made the following achievements for RoF technology and the integr...

  14. An approach for physical layer security enhancement and PAPR reduction in OFDM-PON

    Science.gov (United States)

    Chen, Junxin; Zhu, Zhi-liang

    2017-07-01

    This work develops a solution for simultaneous physical layer security enhancement and peak-to-average power ratio (PAPR) reduction for orthogonal frequency division multiplexing passive optical network (OFDM-PON) systems. The encryption is carried out within the subcarriers with the help of three-dimensional (3-D) chaotic cat map. Experimental results demonstrate that the OFDM-PON system under the protection of the proposed technique is high sensitive to the secret key, invalid optical network units cannot obtain any useful information from the ciphertext. Besides, the PAPR of the OFDM symbols has also been significantly reduced, and hence the system is more robust against various nonlinear disturbances.

  15. Experimental demonstration of an NOMA-PON with single carrier transmission

    Science.gov (United States)

    Lin, Bangjiang; Ghassemlooy, Zabih; Tang, Xuan; Li, Yiwei; Zhang, Min

    2017-08-01

    We introduce a non-orthogonal multiple access (NOMA) scheme for next generation passive optical network (PON) with single carrier transmission and frequency domain successive interference cancellation (FD-SIC), which offers low peak to average power ratio, a good balance between throughput and fairness, and a higher system capacity for a larger number of users. The feasibility of the proposed scheme is verified with 6.6 Gbps bidirectional NOMA-PON transmission. The effect of power allocation on the bit error rate performance is investigated.

  16. Coherent Detection for 1550 nm, 5 Gbit/s VCSEL Based 40 km Bidirectional PON Transmission

    DEFF Research Database (Denmark)

    Jensen, Jesper Bevensee; Rodes Lopez, Roberto; Zibar, Darko

    2011-01-01

    Coherent detection of directly modulated 1550nm VCSELs in 5Gbit/s bidirectional 40km SSMF PON-links is presented. Receiver sensitivity of –37.3dBm after transmission is achieved with 30dB system margin, corresponding to 1:1024 passive powersplitting.......Coherent detection of directly modulated 1550nm VCSELs in 5Gbit/s bidirectional 40km SSMF PON-links is presented. Receiver sensitivity of –37.3dBm after transmission is achieved with 30dB system margin, corresponding to 1:1024 passive powersplitting....

  17. Paraoxonase (PON)-1 activity in overweight and obese children and adolescents: association with obesity-related inflammation and oxidative stress

    NARCIS (Netherlands)

    Krzystek-Korpacka, Małgorzata; Patryn, Eliza; Hotowy, Katarzyna; Czapińska, Elżbieta; Majda, Jacek; Kustrzeba-Wójcicka, Irena; Noczyńska, Anna; Gamian, Andrzej

    2013-01-01

    Paraoxonase-1 (PON1) is a HDL-attached extracellular esterase which is believed to contribute to the anti-atherogenic and anti-inflammatory properties of HDL. A decrease in PON1 is a risk factor for cardiovascular disease and has recently been found to be associated with juvenile obesity. The issue

  18. A 20 km/80 Gbps bidirectional PON employing three-stage injection-locked VCSELs/NDFs/OBPFs

    Science.gov (United States)

    Ying, Cheng-Ling; Lu, Hai-Han; Li, Chung-Yi; Lin, Che-Yu; Wan, Zhi-Wei; Cheng, Chun-Jen

    2015-12-01

    A 20 km/80 Gbps bidirectional passive optical network (PON) employing three-stage, injection-locked, 1.55 μm, vertical-cavity surface-emitting lasers (VCSELs), negative dispersion fibers (NDFs), and optical band-pass filters (OBPFs) is proposed and demonstrated. The three-stage injection-locked technique, which can greatly increase the frequency response of VCSELs, is thereby expected to provide excellent transmission performance in a bi-directional PON. To be the first one of employing directly modulated, three-stage injection-locked, 1.55 μm, VCSELs; NDFs; and OBPFs results in excellent bit error rate (BER) performance, and clear eye diagrams are obtained for 20 km/80 Gbps, bidirectional PON applications. Such a novel bidirectional PON provides the advantage of a communication link for high data rates that could accelerate bidirectional PON deployment.

  19. Frequency and clinical significance of transient hyperechoic renal medulla in neonates

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Sung Shick; Kim, Jung Hoon; Hong, Hyun Sook; Shin, Ji Hoon; Hwang, Jung Hwa; Goo, Dong Erk; Kwon, Kui Hyang; Choi, Deuk Lin [Soonchunhyang University Hospital, Seoul (Korea, Republic of)

    2001-12-15

    To evaluate the clinical significance of transient hyperechogenicity of the renal medulla in neonates by comparing the clinical features, urinalysis and follow-up ultrasonographic examination of the control group. One hundred ten neonates were divided into 2 groups, hyperechoic and normal renal medulla groups, and all of them underwent abdominal ultrasound with a 7.5 MHz linear transducer (Sonoace 8800MT, Medicine, Korea) from November 1999 to January 2000. Whether there was any difference in clinical features including birth weight, body surface area, gestational age, sex, date of examination and mode of delivery between two groups was evaluated. In addition, any difference in their urinary osmolarity, albumin, uric acid and calcium in 41 neonates who underwent urinalysis was evaluated. In ten neonates with hyperechoic renal medulla underwent follow-up study, the follow-up ultrasonographic findings were compared with the initial study. In 67 of 110 (61%) neonates, ultrasonography demonstrated hyperechoic renal medulla. There was no difference in clinical features between the hyperechoic renal medullary group and normal group. In 41 neonates, there was no significant difference in urinalysis between two groups. (Osmolarity=146.46 +- 68.4 mOsml/KgH{sub 2}O in the hyperechoic renal medullary group vs. 149.8 +- 77.7 mOsml/KgH{sub 2}O in the normal group; albumin=13.9 +- 10.2 mg/ml vs. 17.6 +- 13.6 mg/dl; uric acid=50.0 +- 23.3 mg/dl vs. 44.9 +- 34.1 mg/dl; calcium=1.38 +- 3.0 mg/ dl vs. 0.44 +- 0.07 mg/dl.) Ten neonates who underwent follow-up ultrasonography within 20 days after the initial study showed the normal medullary echogenicity. There were no significant difference between the hyperechoic renal medullary group and the normal echogenic group in their clinical features and urinalysis. Therefore, the hyperechoic renal medullar in neonate is considered as an usual and transient finding which disappears on follow-up study.

  20. Homology modeling of human serum paraoxonase1 and its molecular interaction studies with aspirin and cefazolin

    OpenAIRE

    Salman, Mohammed; Malleda, Chandramouli; Suneel, Narayanavari A; Qureshi, Insaf A; Frank, Elizabeth A; D’Souza, Cletus JM

    2011-01-01

    Human serum paraoxonase1 (HuPON1) belongs to the family of A-esterases (EC.3.1.8.1). It is associated with HDL particle and prevents atherosclerosis by cleaving lipid hydroperoxides and other proatherogenic molecules of oxidized low density lipoproteins (LDL). Since the precise structure of HuPON1 is not yet available, the structure-function relationship between HuPON1 and activators/inhibitors is still unknown. Therefore, a theoretical model of HuPON1 was generated using homology modelling a...

  1. Impairments due to Burst-Mode Transmission in a Raman-based Long Reach PON Link

    DEFF Research Database (Denmark)

    Kjær, Rasmus; Tafur Monroy, Idelfonso; Oxenløwe, Leif Katsuo

    2007-01-01

    A recently proposed passive-optical-network (PON) link based on distributed Raman amplification is tested with disturbing burst-mode traffic. The resulting impairments are quantified through penalty measurements on a single surviving data channel as a function of the disturbing channel power. When...

  2. Chiari 0 malformation with syringomyelia syringobulbia and syrinx cavity in pons

    Directory of Open Access Journals (Sweden)

    Yuan Zhou

    2016-12-01

    Full Text Available Chiari 0 malformation (CM-0 with syringomyelia syringobulbia and syrinx cavity in pons simultaneously is rare. We present a case of 31-year-old man, review the available literature, and discuss the experience of therapy from the neurosurgical perspective.

  3. Demonstration of digital fronthaul over self-seeded WDM-PON in commercial LTE environment.

    Science.gov (United States)

    Ma, Yiran; Xu, Zhiguang; Zhang, Chengliang; Lin, Huafeng; Wang, Qing; Zhou, Min; Wang, Heng; Yu, Jingwen; Wang, Xiaomu

    2015-05-04

    CPRI between BBU and RRU equipment is carried by self-seeded WDM-PON prototype system within commercial LTE end-to-end environment. Delay and jitter meets CPRI requirements while services demonstrated show the same performance as bare fiber.

  4. “Heart Appearance” Infarction of the Pons: A Case Report

    Directory of Open Access Journals (Sweden)

    Keisuke Ishizawa

    2012-01-01

    Full Text Available “Heart appearance” on magnetic resonance imaging (MRI is a unique presentation of bilateral medial medullary infarction. In contrast, “heart appearance” infarction of the pons has rarely been featured in the medical literature. In this paper, we present a case of “heart appearance” infarction of the pons with its MRI and magnetic resonance angiography (MRA findings. The patient was an 87-year-old male who manifested with weakness in the four extremities. Later, bulbar palsy and tetraplegia became apparent, and he eventually was trapped in locked-in syndrome. Brain MRI disclosed a “heart appearance” lesion in the pons, which was high on diffusion-weighted image MRI and low on apparent diffusion coefficient map MRI. Brain MRA demonstrated that the basilar artery remained intact. A diagnosis of fresh, bilateral pontine infarction with a “heart appearance” was made. After the treatment he was transferred to another hospital for long-term care. This case suggests that bilateral ischemic involvement of the pons is possible even in the context of an intact basilar artery.

  5. Study of S-G filter based real-time OFDM-PON system

    Science.gov (United States)

    Deng, Conghui; Zhang, Qi; Wang, Yongjun; Xin, Xiangjun

    2013-12-01

    Real-time Orthogonal Frequency Division Multiplexing Passive Optical Network (OFDM-PON) has been extensively studied at home and abroad in recent years. In this paper, we realize a real-time OFDM transmitter system and introduce Savitzky-Golay filter to smooth the transmitted signal into the communication system. Firstly, the architecture of the real-time OFDM-PON was proposed in which a Xilinx V5 FPGA is used to generate the OFDM signal and a S-G filter is used to smooth the signal and weaken the noise. At the receiver, we use MATLAB to recover the signal and simulate the constellation diagram and bit error rate. What's more, this paper introduces the basic principle of S-G filter and analysis the performance of the filter when it is used in an OFDM system. In conclusion, the simulation results show that the S-G filter implemented in the real-time OFDM-PON system is easy to realize that it can reduce the complexity of the system and bit error rate at the same time. As a result, it is proofed to be suitable for the real-time OFDM-PON system.

  6. Duplexing methods for PON systems using multimode fiber with multicarrier transmission

    NARCIS (Netherlands)

    Taniman, R.O.; Megret, P.; van Bochove, A.C.; Wuilpart, M.; Bette, S.; Staquet, N.

    2005-01-01

    Deploying a PON using multimode fiber in the access network is viewed as a costeffective solution. However, a multimode fiber link exhibits a time-dispersive nature. To cope with this problem, an OFDM transmission method is used. In this work, a comparison study on several duplexing methods for this

  7. Integration of Optically Generated Impulse Radio UWB Signals into Baseband WDM-PON

    DEFF Research Database (Denmark)

    Pham, Tien Thang; Yu, Xianbin; Dittmann, Lars

    2011-01-01

    We propose a compact integration system to simultaneously provide wireline and wireless (baseband and ultra-wide band (UWB)) services to end-users in a WDM-PON. A 1-Gbps UWB signal is optically generated and shares the same wavelength with the baseband signal. Error-free performance was achieved ...

  8. MIMO-OFDM WDM PON with DM-VCSEL for femtocells application

    DEFF Research Database (Denmark)

    Binti Othman, Maisara; Deng, Lei; Pang, Xiaodan

    2011-01-01

    We report on experimental demonstration of 2x2 MIMO-OFDM 5.6-GHz radio over fiber signaling over 20 km WDM-PON with directly modulated (DM) VCSELs for femtocells application. MIMO-OFDM algorithms effectively compensate for impairments in the wireless link. Error-free signal demodulation of 64...

  9. 26-Gb/s DMT Transmission Using Full C-Band Tunable VCSEL for Converged PONs

    DEFF Research Database (Denmark)

    Wagner, Christoph; Dochhan, Annika; Eiselt, Michael H.

    2017-01-01

    Wavelength division multiplex (WDM) passive optical network (PON) is considered for converged fixed mobile broadband access networking. We propose to utilize low-cost tunable lasers at the remote sites, together with a centralized wavelength locker. Practical implementations require a transparent...

  10. Direct effect of hypothalamic neuropeptides on the release of catecholamines by adrenal medulla in sheep - study ex vivo.

    Science.gov (United States)

    Wrońska, D; Kania, B F; Błachuta, M

    2017-03-01

    Stress causes the activation of both the hypothalamic-pituitary-adrenocortical axis and sympatho-adrenal system, thus leading to the release from the adrenal medulla of catecholamines: adrenaline and, to a lesser degree, noradrenaline. It has been established that in addition to catecholamines, the adrenomedullary cells produce a variety of neuropeptides, including corticoliberine (CRH), vasopressin (AVP), oxytocin (OXY) and proopiomelanocortine (POMC) - a precursor of the adrenocorticotropic hormone (ACTH). The aim of this study was to investigate adrenal medulla activity in vitro depending, on a dose of CRH, AVP and OXY on adrenaline and noradrenaline release. Pieces of sheep adrenal medulla tissue (about 50 mg) were put on 24-well plates and were incubated in 1 mL of Eagle medium without hormone (control) or supplemented only once with CRH, AVP and OXY in three doses (10-7, 10-8 and 10-9 M) in a volume of 10 μL. The results showed that CRH stimulates adrenaline and noradrenaline release from the adrenal medulla tissue. The stimulating influence of AVP on adrenaline release was visible after the application of the two lower doses of this neuropeptide; however, AVP reduced noradrenaline release from the adrenal medulla tissue. A strong, inhibitory OXY effect on catecholamine release was observed, regardless of the dose of this hormone. Our results indicate the important role of OXY in the inhibition of adrenal gland activity and thus a better adaptation to stress on the adrenal gland level.

  11. Characterization of energy-efficient and colorless ONUs for future TWDM-PONs.

    Science.gov (United States)

    Wong, Elaine; Mueller, Michael; Amann, Markus C

    2013-09-09

    The Full Services Access Network group has recently selected the time and wavelength division multiplexed passive optical network (TWDM-PON) as the base technology solution for next-generation PON stage-2 (NG-PON2). Meeting the core requirements of NG-PON2 necessitates the following additional features in the transceivers of the optical network unit (ONU) that is located at subscriber premises: (a) legacy system compliant; (b) wavelength tunable; (c) cost-efficient; and (d) energy-efficient. To address these features, we investigate the properties of short-cavity vertical-cavity surface-emitting lasers (SC-VCSELs) for implementation as colorless ONU transmitters in future TWDM-PONs. Specifically, we investigate the tunability and transmission performance of the SC-VCSEL across the C-minus wavelength band for legacy system compliance. We report on error-free transmission across a 800 GHz tuning range with a potential aggregate upstream capacity of 80 Gbps over a system reach of 40 km and with a split ratio of 1:128 per wavelength channel. Results were achieved without dispersion compensation and electronic equalization. We also evaluate the energy efficiency of the SC-VCSEL in active, doze, and sleep mode. When in active mode, the SC-VCSEL transmitter block consumes 91.7% less power than a distributed feedback (DFB) laser transmitter block. When transitioning between doze and active modes, the transmitter block has a short settling time of only 205 ns, thus increasing the power-saving duration and consequently reducing the overall power consumption of the ONU. Through numerical analysis, evaluation of the energy-savings of the SC-VCSEL ONU over the DFB ONU under various modes of operation, demonstrates up to 84% of energy-savings. The capacity, tuning range, split ratio, system reach, and energy-savings arising from SC-VCSEL ONU implementation as reported in this work, exceed the minimum requirements of NG-PON2 for future TWDM-PON deployments.

  12. Demonstration of flexible multicasting and aggregation functionality for TWDM-PON

    Science.gov (United States)

    Chen, Yuanxiang; Li, Juhao; Zhu, Paikun; Zhu, Jinglong; Tian, Yu; Wu, Zhongying; Peng, Huangfa; Xu, Yongchi; Chen, Jingbiao; He, Yongqi; Chen, Zhangyuan

    2017-06-01

    The time- and wavelength-division multiplexed passive optical network (TWDM-PON) has been recognized as an attractive solution to provide broadband access for the next-generation networks. In this paper, we propose flexible service multicasting and aggregation functionality for TWDM-PON utilizing multiple-pump four-wave-mixing (FWM) and cyclic arrayed waveguide grating (AWG). With the proposed scheme, multiple TWDM-PON links share a single optical line terminal (OLT), which can greatly reduce the network deployment expense and achieve efficient network resource utilization by load balancing among different optical distribution networks (ODNs). The proposed scheme is compatible with existing TDM-PON infrastructure with fixed-wavelength OLT transmitter, thus smooth service upgrade can be achieved. Utilizing the proposed scheme, we demonstrate a proof-of-concept experiment with 10-Gb/s OOK and 10-Gb/s QPSK orthogonal frequency division multiplexing (OFDM) signal multicasting and aggregating to seven PON links. Compared with back-to-back (BTB) channel, the newly generated multicasting OOK signal and OFDM signal have power penalty of 1.6 dB and 2 dB at the BER of 10-3, respectively. For the aggregation of multiple channels, no obvious power penalty is observed. What is more, to verify the flexibility of the proposed scheme, we reconfigure the wavelength selective switch (WSS) and adjust the number of pumps to realize flexible multicasting functionality. One to three, one to seven, one to thirteen and one to twenty-one multicasting are achieved without modifying OLT structure.

  13. Energy-Saving Mechanism in WDM/TDM-PON Based on Upstream Network Traffic

    Directory of Open Access Journals (Sweden)

    Paola Garfias

    2014-08-01

    Full Text Available One of the main challenges of Passive Optical Networks (PONs is the resource (bandwidth and wavelength management. Since it has been shown that access networks consume a significant part of the overall energy of the telecom networks, the resource management schemes should also consider energy minimization strategies. To sustain the increased bandwidth demand of emerging applications in the access section of the network, it is expected that next generation optical access networks will adopt the wavelength division/time division multiplexing (WDM/TDM technique to increase PONs capacity. Compared with traditional PONs, the architecture of a WDM/TDM-PON requires more transceivers/receivers, hence they are expected to consume more energy. In this paper, we focus on the energy minimization in WDM/TDM-PONs and we propose an energy-efficient Dynamic Bandwidth and Wavelength Allocation mechanism whose objective is to turn off, whenever possible, the unnecessary upstream traffic receivers at the Optical Line Terminal (OLT. We evaluate our mechanism in different scenarios and show that the proper use of upstream channels leads to relevant energy savings. Our proposed energy-saving mechanism is able to save energy at the OLT while maintaining the introduced penalties in terms of packet delay and cycle time within an acceptable range. We might highlight the benefits of our proposal as a mechanism that maximizes the channel utilization. Detailed implementation of the proposed algorithm is presented, and simulation results are reported to quantify energy savings and effects on network performance on different network scenarios.

  14. Severe diffuse axon injury in chronic alcoholic rat medulla oblongata following a concussion blow.

    Science.gov (United States)

    Luo, Jianming; Chen, Guang; Wei, Lai; Qian, Hong; Lai, Xiaoping; Wang, Dian; Lv, Junyao; Yu, Xiaojun

    2014-01-01

    We investigated the axonal morphological changes and expression of both tau protein and β-APP following concussion to the medulla oblongata, in a rat model of chronic alcoholism. Fifty-nine male Sprague-Dawley rats were randomly divided into EtOH, EtOH-TBI and control groups (water group, water-TBI group). To establish chronic alcoholic rats, rats were intragastrically given edible spirituous liquor twice daily. Rats also received a blow on the occipital tuberosity with an iron pendulum. Morphological changes and expression of tau and β-APP proteins in the medulla oblongata were examined. (a) Nerve fibre thickening and twisting were observed in alcoholic rats, with nerve fibre changes becoming more significant following a concussion blow, which leads to some nerve fibres fracturing. (b) Transmission electron microscopy revealed that the nerve fibre myelin became loosened and displayed lamellar separation, which became more significant following concussion. (c) The integral optical density (IOD) sum value of β-APP of the EtOH-TBI group was lower than that in the EtOH group (P blow. (c) The effect of chronic alcoholism may be synergistic the concussion blow to promote animal injury and death.

  15. Solubilization and Humanization of Paraoxonase-1

    Directory of Open Access Journals (Sweden)

    Mohosin Sarkar

    2012-01-01

    Full Text Available Paraoxonase-1 (PON1 is a serum protein, the activity of which is related to susceptibility to cardiovascular disease and intoxication by organophosphorus (OP compounds. It may also be involved in innate immunity, and it is a possible lead molecule in the development of a catalytic bioscavenger of OP pesticides and nerve agents. Human PON1 expressed in E. coli is mostly found in the insoluble fraction, which motivated the engineering of soluble variants, such as G2E6, with more than 50 mutations from huPON1. We examined the effect on the solubility, activity, and stability of three sets of mutations designed to solubilize huPON1 with fewer overall changes: deletion of the N-terminal leader, polar mutations in the putative HDL binding site, and selection of the subset of residues that became more polar in going from huPON1 to G2E6. All three sets of mutations increase the solubility of huPON1; the HDL-binding mutant has the largest effect on solubility, but it also decreases the activity and stability the most. Based on the G2E6 polar mutations, we “humanized” an engineered variant of PON1 with high activity against cyclosarin (GF and found that it was still very active against GF with much greater similarity to the human sequence.

  16. CYP/PON genetic variations as determinant of organophosphate ...

    Indian Academy of Sciences (India)

    1Centre for Environmental Science and Technology, 2Centre for Human Genetics and Molecular Medicine, Central. University of Punjab, Bathinda 151001, India. Abstract. In the present scenario of increased accumulation of pesticides in the environment, it is important to understand its impact on human health. The focus is ...

  17. Human carotid plaque phosphatidylcholine specifically interacts with paraoxonase 1, increases its activity, and enhances its uptake by macrophage at the expense of its binding to HDL.

    Science.gov (United States)

    Cohen, Elad; Aviram, Michael; Khatib, Soliman; Artoul, Fadi; Rabin, Asaf; Mannheim, Dalit; Karmeli, Ron; Salamon, Tal; Vaya, Jacob

    2014-11-01

    Human carotid atherosclerotic plaque is in direct contact with circulatory blood components. Thus, plaque and blood components may affect each other. The current study presents the effects of plaque chloroform:methanol (C:M) extract on the HDL-associated enzyme paraoxnase 1 (PON1). This study is part of our investigation on the mutual effects of the interactions between atherosclerotic lesions and blood components. Recombinant PON1 (rePON1) was incubated with the human carotid plaques C:M extract and PON1 activities were analyzed. Lactonase and paraoxonase activities were elevated due to C:M treatment, by 140 and by 69%, respectively. Analytical chemistry analyses revealed specific phosphatidylcholines (PCs) as the plaque active components. Tryptophan fluorescence quenching assay, together with molecular docking, shows that PON1 activity is enhanced in correlation with the level of PC affinity to PON1. Molecular docking revealed that PCs interact specifically with H2-PON1 α-helix, which together with H1 enzyme α-helix links the protein to the HDL surface. These findings are supported by additional results from the PON1 ∆20 mutant that lack its H1-α-helix. Incubation of this mutant with the plaque C:M extract increased PON1 activity by only 20%, much less than the wild-type PON1 that elevated PON1 activity at the same concentration by as much as 95%. Furthermore, as much as the affinity of the enzyme to the PC was augmented, the ability of PON1 to bind to the HDL particle decreased. Finally, PON1 interaction with PC enhance its uptake into the macrophage cytoplasm. In conclusions, Specific lesion phosphatidylcholines (PCs) present in the human carotid plaque significantly enhance PON1 catalytic activities due to their interaction with the enzyme. Such a lesion׳s PC-PON1 interaction, in turn, competes with HDL PCs and enhances PON1 uptake by macrophage at the expense of PON1 binding to the HDL. Copyright © 2014 Elsevier Inc. All rights reserved.

  18. Photoaffinity crosslinking of etorphine with opioid binding sites in the bovine adrenal medulla

    Energy Technology Data Exchange (ETDEWEB)

    Cantau, P.; Bourhim, N.; Giraud, P.; Oliver, C.; Castanas, E.

    1987-04-01

    The covalent crosslinking of (/sup 3/H)etorphine with opioid binding sites in the bovine adrenal medulla is reported. Of all the radiolabeled opiates tested (ethylketocyclazocine, etorphine, (D-Ala2, D-Leu5)enkephalin, (D-Ala2, Me-Phe4, Gly5-ol)enkephalin only etorphine could be crosslinked under uv irradiation. In our conditions (black uv lamp, 160 W, peak mean 360 nm, from a distance of 10 cm) maximum covalent binding was observed after a 10-min irradiation. Protein concentration was a crucial factor for the irreversible/total binding ratio. A good ratio (50%) was obtained at protein concentrations of about 1.0 mg/ml. Covalent binding of nonmodified opiates could be of interest for the biochemical characterization of their binding sites.

  19. The renin-angiotensin system; development and differentiation of the renal medulla

    DEFF Research Database (Denmark)

    Madsen, Kirsten; Robdrup Tinning, Anne; Marcussen, Niels

    2013-01-01

    in extracellular volume control and long term blood pressure regulation. Previously, nephron endowment and functional consequences of a low nephron number has been extensively investigated without achieving a full explanation of the underlying pathophysiological mechanisms. In this review, we will focus...... on mechanisms of postnatal development the renal medulla and putting medullary developmental lesions into perspective with regard to the programming effect. Moreover, the renin-angiotensin system is critically involved in mammalian kidney development and signaling disorders give rise to developmental renal...... disturbances reaching into adulthood. A review of current knowledge of the role of the renin-angiotensin system for renal medullary development will be given. Acta Physiologica © 2013 Scandinavian Physiological Society....

  20. Hypoglossal motoneurons in newborn mice receive respiratory drive from both sides of the medulla

    DEFF Research Database (Denmark)

    Tarras-Wahlberg, S; Rekling, J C

    2009-01-01

    correlations, where large-amplitude XII-bursts on one side was synchronized with small-amplitude XII-burst on the contralateral side. These characteristic amplitude correlations suggest that hypoglossal motoneurons receive respiratory drive from bilateral sources. Retrograde labeling confirmed that commissural...... fibers from the pre-Bötzinger complex cross in the mid-1/3 of the midline, and that dendrites of hypoglossal motoneurons project into the contralateral XII nucleus. In conclusion, commissural fibers crossing in the mid-1/3 of the midline are required for synchronization of respiratory activity...... in bilateral XII nerves. Hypoglossal motoneurons receive respiratory drive from both sides of the medulla, possibly mediated by contralaterally projecting dendrites....

  1. Distribution of angiotensin converting enzyme in sheep hypothalamus and medulla oblongata visualized by in vitro autoradiography

    Energy Technology Data Exchange (ETDEWEB)

    Chai, S.Y.; McKinley, M.J.; Mendelsohn, F.A.

    1987-01-01

    In vitro autoradiographic mapping of angiotensin converting enzyme (ACE) in sheep brain using the specific ACE inhibitor, /sup 125/I-351A, revealed very high densities of binding in large blood vessels and choroid plexus. In the a very high density of labelling occurred in the organum vasculosum of the lamina terminalis and median eminence and a high density in the subfornical organ and moderate density in supraoptic, suprachiasmatic, arcuate and paraventricular nuclei. All fiber tracts were unlabelled. In the medulla oblongata, a very high density of binding was detected in the area postrema and a high density in the nucleus of the solitary tract and dorsal motor nucleus of the vagus; a moderate density was found in the substantia gelatinosa of the spinal tract and the inferior olivary nucleus.

  2. Leptin into the rostral ventral lateral medulla (RVLM augments renal sympathetic nerve activity and blood pressure

    Directory of Open Access Journals (Sweden)

    Maria J Barnes

    2014-08-01

    Full Text Available Leptin is a hormone released from adipose tissue. While this hormone normally acts to reduce feeding behavior and increase energy expenditure, in obesity, resistance to these effects occurs even though the hormone is released in large amounts. Although leptin no longer works to suppress feeding in the obese, leptin retains its potent effects on other autonomic functions such as blood pressure regulation. Leptin has been associated with hypertension and increased sympathetic autonomic activity. Therefore, leptin is emerging as a major contributor to the hypertensive state observed in obesity. Sympathetic control of blood pressure is maintained principally by autonomic reflex control circuits in the caudal brainstem. The rostral ventral-lateral medulla (RVLM is the primary regulator of the sympathetic nervous system, sending excitatory fibers to sympathetic preganglionic neurons to regulate sympathetic control over resistance vessels and blood pressure. Previous studies from our laboratory have shown that neurons in the ventral lateral medulla express leptin receptors (ObRb. Our present study using pseudo-rabies multi-synaptic retrograde tract tracing and immunohistochemical methods revealed that neurons within the RVLM that send sympathetic projections to the kidney express leptin receptors. Acute microinjection of leptin (1 and 3µg; 40nL into the RVLM evoked a significant increase in Mean Arterial Pressure (MAP and renal sympathetic nerve activity (RSNA. When the 3µg dose of leptin was preceded with a leptin antagonist, (SLAN-4; 1ng, it attenuated the cardiovascular response of leptin. Taken together, these data suggest that leptin’s actions within the RVLM may influence blood pressure and renal sympathetic nerve activity.

  3. Sensory sciatic nerve afferent inputs to the dorsal lateral medulla in the rat.

    Science.gov (United States)

    Alioto, Olavo Egídio; Lindsey, Charles Julian; Koepp, Janice; Caous, Cristofer André

    2008-06-01

    Investigations show the paratrigeminal nucleus (Pa5) as an input site for sensory information from the sciatic nerve field. Functional or physical disruption of the Pa5 alters behavioral and somatosensory responses to nociceptive hindpaw stimulation or sciatic nerve electrostimulation (SNS), both contralateral to the affected structure. The nucleus, an input site for cranial and spinal nerves, known for orofacial nociceptive sensory processing, has efferent connections to structures associated with nociception and cardiorespiratory functions. This study aimed at determining the afferent sciatic pathway to dorsal lateral medulla by means of a neuronal tract-tracer (biocytin) injected in the iliac segment of the sciatic nerve. Spinal cord samples revealed bilateral labeling in the gracile and pyramidal or cuneate tracts from survival day 2 (lumbar L1/L2) to day 8 (cervical C2/C3 segments) following biocytin application. From day 10 to day 20 medulla samples showed labeling of the contralateral Pa5 to the injection site. The ipsilateral paratrigeminal nucleus showed labeling on day 10 only. The lateral reticular nucleus (LRt) showed fluorescent labeled terminal fibers on day 12 and 14, after tracer injection to contralateral sciatic nerve. Neurotracer injection into the LRt of sciatic nerve-biocytin-treated rats produced retrograde labeled neurons soma in the Pa5 in the vicinity of biocytin labeled nerve terminals. Therefore, Pa5 may be considered one of the first sites in the brain for sensory/nociceptive inputs from the sciatic nerve. Also, the findings include Pa5 and LRt in the neural pathway of the somatosympathetic pressor response to SNS and nocifensive responses to hindpaw stimulation.

  4. Radiation necrosis of the pons after radiotherapy for nasopharyngeal carcinoma: diagnosis and treatment.

    Science.gov (United States)

    DeSalvo, Matthew N

    2012-07-01

    We report a case of radiation necrosis in an unusual location, the pons, in a patient who had received chemoradiation for nasopharyngeal carcinoma (NPC) over one year prior to presentation. This patient presented with subacute onset of ataxic hemiparesis and slurred speech. Initial magnetic resonance imaging (MRI) studies showed two 1-2 cm peripherally contrast-enhancing lesions in the pons with extensive surrounding edema. Proton magnetic resonance spectroscopy (MRS) played a key role in narrowing the differential diagnosis to radiation necrosis. The patient underwent biweekly bevacizumab therapy and has remained clinically stable with radiologic improvement of his lesion. In addition to this case, we present an overview of the use of advanced neuroimaging in distinguishing radiation necrosis of the central nervous system (CNS) from other entities as well as the role of bevacizumab in treatment.

  5. Optimization model for UDWDM-PON deployment based on physical restrictions and asymmetric user's clustering

    Science.gov (United States)

    Arévalo, Germán. V.; Hincapié, Roberto C.; Sierra, Javier E.

    2015-09-01

    UDWDM PON is a leading technology oriented to provide ultra-high bandwidth to final users while profiting the physical channels' capability. One of the main drawbacks of UDWDM technique is the fact that the nonlinear effects, like FWM, become stronger due to the close spectral proximity among channels. This work proposes a model for the optimal deployment of this type of networks taking into account the fiber length limitations imposed by physical restrictions related with the fiber's data transmission as well as the users' asymmetric distribution in a provided region. The proposed model employs the data transmission related effects in UDWDM PON as restrictions in the optimization problem and also considers the user's asymmetric clustering and the subdivision of the users region though a Voronoi geometric partition technique. Here it is considered de Voronoi dual graph, it is the Delaunay Triangulation, as the planar graph for resolving the problem related with the minimum weight of the fiber links.

  6. Test MFT Hockey Women Athletes in Central Java Facing PON XIX West Java Year 2016

    Directory of Open Access Journals (Sweden)

    Fery Darmanto

    2017-06-01

    Full Text Available The aim of the research was to know the physical condition of female Hockey athletes of Central Java especially in cardio capacity endurance to participate in PON XIX West Java, 2016. The type of this research was quantitative descriptive, with 22 female athtletes as the population. The technique in data collection used was population research that is all samples in this study were taken all. The sampling method used was quantitative technique with descriptive approach. The result of this research was the average physical condition especially in endurance was tested using the MFT in the degrees of being. It was proven that the average VO2max of female Hockey athletes of Central Java was 39.6 ml/kg/min or 8.5 in MSFT reverse. The conclusion was the physical condition of the female Hockey athletes of Central Java who would attend PON XIX 2016 in West Java was in moderate level.

  7. Extrastriatal binding of [¹²³I]FP-CIT in the thalamus and pons

    DEFF Research Database (Denmark)

    Koch, Walter; Unterrainer, Marcus; Xiong, Guoming

    2014-01-01

    PURPOSE: Apart from binding to the dopamine transporter (DAT), [(123)I]FP-CIT shows moderate affinity for the serotonin transporter (SERT), allowing imaging of both monoamine transporters in a single imaging session in different brain areas. The aim of this study was to systematically evaluate...... extrastriatal binding (predominantly due to SERT) and its age and gender dependencies in a large cohort of healthy controls. METHODS: SPECT data from 103 healthy controls with well-defined criteria of normality acquired at 13 different imaging centres were analysed for extrastriatal binding using volumes...... of interest analysis for the thalamus and the pons. Data were examined for gender and age effects as well as for potential influence of striatal DAT radiotracer binding. RESULTS: Thalamic binding was significantly higher than pons binding. Partial correlations showed an influence of putaminal DAT binding...

  8. ONU migration in dynamic Time and Wavelength Division Multiplexed Passive Optical Network (TWDM-PON).

    Science.gov (United States)

    Yang, Hongyang; Sun, Weiqiang; Hu, Weisheng; Li, Jun

    2013-09-09

    We propose a novel Optical Network Units (ONU) migration mechanism within the Time and Wavelength Division Multiplexed PON (TWDM-PON) framework by rearranging the working ONUs to a minimum number of wavelengths and turning off the rest to save power. We show through simulation that the number of working wavelengths can be minimized up to a theoretical lower bound, e.g. 23%, under the typical ONU online profiles. We further investigate how the migration interval and delay influence the user Service Level Agreement (SLA). We find that under the example ONU online profiles, 99.99% ONU SLA can be realized with the migration delay of 1000 milli-seconds. However to realize 99.999% ONU SLA, the migration delay must be 100 milli-seconds or lower.

  9. 85 km Long Reach PON System Using a Reflective SOA-EA Modulator and Distributed Raman Fiber Amplification

    DEFF Research Database (Denmark)

    Tafur Monroy, Idelfonso; Öhman, Filip; Yvind, Kresten

    2006-01-01

    We report on a bidirectional 85 km long reach PON system supported by distributed fiber Raman amplification with a record 7.5 Gb/s remote carrier modulated upstream signal by employing a reflective SOA-EA monolithically integrated circuit......We report on a bidirectional 85 km long reach PON system supported by distributed fiber Raman amplification with a record 7.5 Gb/s remote carrier modulated upstream signal by employing a reflective SOA-EA monolithically integrated circuit...

  10. Association between Paraoxonase 1 (PON1 Polymorphisms and the Risk of Acute Coronary Syndrome in a North African Population.

    Directory of Open Access Journals (Sweden)

    Abdelghani Bounafaa

    Full Text Available The purpose of the present study was to investigate the distribution of PON1 Q192R and L55M polymorphisms and activities in a North African population and to determine their association with cardiovascular complications. The prevalence of the QQ, QR, RR, LL, LM, and MM genotypes in the study population was 55.4%, 34.09%, 9.83%, 41.97%, 48.20%, and 9.83% respectively. The Q, R, L, and M alleles had a gene frequency of 0.755, 0.245, 0.67, and 0.33, respectively. The PON1 192 RR genotype was significantly more prevalent among ACS patients than among healthy subjects. There was a 4.33-fold increase in the risk of ACS in subjects presenting the PON1 192 RR genotype compared to those with the QQ genotype (OR=4.33; 95% CI=1.27-17.7. There was a significantly different distribution of PON1 L55M in the ACS patient groups (UA, STEMI, NSTEMI. Moreover, individuals presenting the PON1 55MM genotype present a higher risk for ACS than those with LL genotype (OR=3.69; 95% CI=1.61-11.80. Paraoxonase activities were significantly lower in coronary patients than in healthy subjects. The decrease in PON1 activity was inversely correlated with the number of concomitant risk factors for CVD (r=0.57, p<0.0001. The results of the present study suggested that the PON1 R and M alleles may play a role in the pathogenesis of cardiac ischemia in our North African population and that a decrease in PON1 activity may be a valuable marker for monitoring the development of the atherosclerosis process and the associated cardiovascular complications.

  11. 40 Gb/s Lane Rate NG-PON using Electrical/Optical Duobinary, PAM-4 and Low Complex Equalizations

    DEFF Research Database (Denmark)

    Wei, J. L.; Grobe, Klaus; Wagner, Christoph

    2016-01-01

    We present the first numerical investigation and comparison of 40-Gb/s lane rate electrical Duobinary, optical Duobinary and PAM-4 for NG-PONs incorporating low complex linear and nonlinear post-equalizations.......We present the first numerical investigation and comparison of 40-Gb/s lane rate electrical Duobinary, optical Duobinary and PAM-4 for NG-PONs incorporating low complex linear and nonlinear post-equalizations....

  12. In Vitro Research of the Alteration of Neurons in Vagal Core in Medulla Oblongata at Asphyxic Deaths

    Directory of Open Access Journals (Sweden)

    Naim Haliti

    2010-08-01

    Full Text Available The aim of this study was to research the morphological changes of neurons in the vagus nerve nuclei in medulla oblongata in asphyxia related death cases. Morphological changes that were investigated were mainly in the dorsal motor respiratory center (DMRC, nucleus tractus solitarius (nTS and nucleus ambigus (nA in the medulla oblongata. In our research, the autopsy material from asphyxia related death cases was used from various etiologies: monoxide carbon (CO, liquid drowning, strangulation, electricity, clinical-pathological death, firing weapon, explosive weapon, sharp and blunt objects and death cases due to accident. The material selected for research was taken from medulla oblongata and lungs from all lobes. The material from the medulla oblongata and lungs was fixed in a 10% solution of buffered formalin. Special histochemical methods for central nervous system (CNS were employed like: Cresyl echt violet, toluidin blue, Sevier-Munger modification and Grimelius. For stereometrical analysis of the quantitative density of the neurons the universal testing system Weibel M42 was used. The acquired results show that in sudden asphyxia related death cases, there are alterations in the nuclei of vagal nerve in form of: central chromatolysis, axonal retraction, axonal fragmentation, intranuclear vacuolization, cytoplasmic vacuolization, edema, condensation and dispersion of substance of Nissl, proliferation of oligodendrocytes, astrocytes and microglia. The altered population of vagus nerve neurons does not show an important statistica! significarne compared to the overall quantity of the neurons in the nuclei of the vagus nerve (p<0,05.

  13. Traffic Control Algorithm Offering Multi-Class Fairness in PON Based Access Networks

    Science.gov (United States)

    Okumura, Yasuyuki

    This letter proposes a dynamic bandwidth allocation algorithm for access networks based PON (Passive Optical Network). It considers the mixture of transport layer protocols when responding to traffic congestion at the SNI (Service Node Interface). Simulations on a mixture of TCP (Transmission Control Protocol), and UDP (User Datagram Protocol) traffic flows show that the algorithm increases the throughput of TCP, improves the fairness between the two protocols, and solves the congestion problem at the SNI.

  14. DWDM-PON at 25 GHz channel spacing based on ASE injection seeding.

    Science.gov (United States)

    Kim, Joon-Young; Moon, Sang-Rok; Yoo, Sang-Hwa; Lee, Chang-Hee

    2012-12-10

    We demonstrate a 25 GHz-channel-spaced DWDM-PON based on ASE injection seeding. A 60 km transmission at 1.25 Gb/s per channel is available with a 2nd generation FEC. The major limiting factor is the optical back reflection induced penalty. Thus a high gain reflective modulator and/or relocation of the seed light increase the transmission length. We demonstrated 90 km transmission with relocated seed light to remote node.

  15. Optical MIMO NOMA-PON based on single carrier transmission and polarization interleaving

    Science.gov (United States)

    Lin, Bangjiang; Zhang, Kaiwei; Tang, Xuan; Li, Yiwei; Zhang, Min; Ghassemlooy, Zabih

    2017-07-01

    We experimentally demonstrate optical multiple inputs and multiple outputs (MIMO) transmission for non-orthogonal multiple access (NOMA) based passive optical network (PON) using polarization interleaving, which offers a higher system capacity for a larger number of users. The MIMO demultiplexing and the inter-user interference mitigation are realized with efficient channel equalization. The optimum power allocation ratio is about 0.42 in the case of four users.

  16. Alcohol drinking patterns and habits among a sample of PONS study subjects: preliminary assessment.

    Science.gov (United States)

    Przewoźniak, Krzysztof; Łobaszewski, Jakub; Wojtyła, Andrzej; Bylina, Jerzy; Mańczuk, Marta; Zatoński, Witold A

    2011-01-01

    Alcohol drinking is a major contributing factor to death, disease, injury and social problems such as violence or child neglect and abuse, especially in Eastern Europe. To preliminary evaluate the prevalence and social and behavioural patterns of alcohol drinking in a pilot group of the Polish-Norwegian Study (PONS study) subjects. Open-ended prospective cohort study conducted in Świetokrzyskie province. A pilot group of subjects aged 45-64 years has been examined. Data on alcohol drinking were collected for 3,845 respondents with the use of the Health State Questionnaire administered by the CAPI method. In males, 72.3% drank alcohol currently, 22.7% were former drinkers, and only 5% never drinkers. Among females, the percentage of current alcohol drinkers was significantly lower than in males, while the percentages of former and never drinkers was higher (50.3%, 35.4% and 14.6%, respectively). 7.4% of males and 0.8% of females drank alcohol daily or almost daily, and weekly alcohol drinking was respectively at level of 32.2% and 15.7%. Males drank mainly vodka (or other spirits) and beer, females grape wine and vodka. PONS study includes interesting dataset for assessing prevalence and patterns of alcohol drinking at population level. Alcohol drinking seems to be common among PONS subjects. Comparison with nation-wide surveys shows on higher number of alcohol abstainers and lower number of binge drinkers among PONS study subjects. On the other hand, frequency and social patterns of alcohol drinking seem to be consistent with data found in national studies.

  17. Demonstration of a WDM/TDM hybrid PON based on a colorless frame-level reach extender

    Science.gov (United States)

    Kim, Kwang-Ok; Lee, Jie-Hyun; Lee, Sang-Soo; Jang, Youn-Seon

    2012-07-01

    We propose a hybrid passive optical network (PON) consisting of a 2.5 Gb/s reflective semiconductor optical amplifier (RSOA)-based 32 channel loopback wavelength division multiplexing-passive optical network (WDM-PON) and a colorless OEO-based frame-level reach extender (RE). This hybrid PON is designed to support a 128-way split over a 50 km transmission distance per single wavelength channel. We experimentally demonstrate the feasibility of this design through downstream and upstream packet transmission with a commercial gigabit-capable PON (GPON) product. Even if the colorless frame-level RE uses active devices at the remote node, it is still possible to increase the optical link budget through backward compatibility with existing GPON products. This design also provides wavelength conversion and an upstream burst-to-continuous mode conversion between the WDM-PON and GPON. The proposed hybrid PON can satisfy a packet loss ratio (PLR) of 10-10 at the downstream and upstream transmission including the use of forward error correction (FEC).

  18. A Functional Polymorphism of the MAOA Gene Modulates Spontaneous Brain Activity in Pons

    Directory of Open Access Journals (Sweden)

    Hui Lei

    2014-01-01

    Full Text Available Objective. To investigate the effects of a functional polymorphism of the monoamine oxidase A (MAOA gene on spontaneous brain activity in healthy male adolescents. Methods. Thirty-one healthy male adolescents with the low-activity MAOA genotype (MAOA-L and 25 healthy male adolescents with the high-activity MAOA genotype (MAOA-H completed the 11-item Barratt Impulsiveness Scale (BIS-11 questionnaire and were subjected to resting-state functional magnetic resonance imaging (rs-fMRI scans. The amplitude of low-frequency fluctuation (ALFF of the blood oxygen level-dependent (BOLD signal was calculated using REST software. ALFF data were related to BIS scores and compared between genotype groups. Results. Compared with the MAOA-H group, the MAOA-L group showed significantly lower ALFFs in the pons. There was a significant correlation between the BIS scores and the ALFF values in the pons for MAOA-L group, but not for the MAOA-H group. Further regression analysis showed a significant genotype by ALFF values interaction effect on BIS scores. Conclusions. Lower spontaneous brain activity in the pons of the MAOA-L male adolescents may provide a neural mechanism by which boys with the MAOA-L genotype confers risk for impulsivity and aggression.

  19. Extended reach OFDM-PON using super-Nyquist image induced aliasing.

    Science.gov (United States)

    Guo, Changjian; Liang, Jiawei; Liu, Jie; Liu, Liu

    2015-08-24

    We investigate a novel dispersion compensating technique in double sideband (DSB) modulated and directed-detected (DD) passive optical network (PON) systems using super-Nyquist image induced aliasing. We show that diversity is introduced to the higher frequency components by deliberate aliasing using the super-Nyquist images. We then propose to use fractional sampling and per-subcarrier maximum ratio combining (MRC) to harvest this diversity. We evaluate the performance of conventional orthogonal frequency division multiplexing (OFDM) signals along with discrete Fourier transform spread (DFT-S) OFDM and code-division multiplexing OFDM (CDM-OFDM) signals using the proposed scheme. The results show that the DFT-S OFDM signal has the best performance due to spectrum spreading and its superior peak-to-average power ratio (PAPR). By using the proposed scheme, the reach of a 10-GHz bandwidth QPSK modulated OFDM-PON can be extended to around 90 km. We also experimentally show that the achievable data rate of the OFDM signals can be effectively increased using the proposed scheme when adaptive bit loading is applied, depending on the transmission distance. A 10.5% and 5.2% increase in the achievable bit rate can be obtained for DSB modulated OFDM-PONs in 48.3-km and 83.2-km standard single mode fiber (SSMF) transmission cases, respectively, without any modification on the transmitter. A 40-Gb/s OFDM transmission over 83.2-km SSMF is successfully demonstrated.

  20. 128 Gb/s TWDM PON system using dispersion-supported transmission method

    Science.gov (United States)

    Bindhaiq, Salem; Zulkifli, Nadiatulhuda; Supa'at, Abusahmah M.; Idrus, Sevia M.; Salleh, M. S.

    2017-11-01

    Time and wavelength division multiplexed passive optical network (TWDM-PON) trend is considered as the most extraordinary trend of the next generation solution to accommodate exponential traffic growth for converged new services. In this paper, we briefly review recent progress on TWDM-PON system through the use of low cost directly modulated lasers (DMLs) transmission for various line rate transmissions to date. Furthermore, through simulation, we propose and evaluate a cost effective way to upgrade TWDM-PON up to a symmetric capacity of 128 Gb/s using fiber Bragg gratings (FBGs) in optical line terminal (OLT) as a paramount dispersion manager in high speed light-wave systems in both upstream and downstream directions. A low cost and potential chirpless directed modulated grating laser (DMGL) is employed for downstream link and DML with a single delay-interferometer (DI) is employed for upstream link. After illustrating the demonstrated system architecture and configuration, we present the results and analysis to prove the system feasibility. The results show that a successful transmission is achieved over 40 km single mode fiber with a power budget of 33.7 dB, which could support 1:256 splitting ratio.

  1. Direct use geothermal PON and PRDA projects under DOE-ID Administration. Annual report FY 1983

    Energy Technology Data Exchange (ETDEWEB)

    Childs, F.W.

    1984-01-01

    This report presents the status of Geothermal PRDA and PON projects administered by the DOE-ID as of the end of FY-1983. Both programs were instituted to assist the development of the direct application of geothermal energy. The PRDA Program consists of a series of studies designed to investigate the engineering and economic feasibility of geothermal direct applications. The PON Program consists of demonstration projects in which project costs are shared between DOE and a private company, municipality, or other organizations. During this reporting period, fiscal year 1983 (October 1, 1982 through September 30, 1983), EG and G Idaho provided program management and technical support for eleven demonstration projects, three engineering and economic studies plus some general institutional support. Each project is summarized. The general format for the project descriptions is to review the activities in FY-1983 separately from background information on project scope and previous years activities. All of the DOE-ID PON experimental demonstration projects are described, but, of 20 studies performed, only the three active PRDA feasibility contracts are covered since they were smaller, more specialized studies.

  2. Traffic-aware energy saving scheme with modularization supporting in TWDM-PON

    Science.gov (United States)

    Xiong, Yu; Sun, Peng; Liu, Chuanbo; Guan, Jianjun

    2017-01-01

    Time and wavelength division multiplexed passive optical network (TWDM-PON) is considered to be a primary solution for next-generation passive optical network stage 2 (NG-PON2). Due to the feature of multi-wavelength transmission of TWDM-PON, some of the transmitters/receivers at the optical line terminal (OLT) could be shut down to reduce the energy consumption. Therefore, a novel scheme called traffic-aware energy saving scheme with modularization supporting is proposed. Through establishing the modular energy consumption model of OLT, the wavelength transmitters/receivers at OLT could be switched on or shut down adaptively depending on sensing the status of network traffic load, thus the energy consumption of OLT will be effectively reduced. Furthermore, exploring the technology of optical network unit (ONU) modularization, each module of ONU could be switched to sleep or active mode independently in order to reduce the energy consumption of ONU. Simultaneously, the polling sequence of ONU could be changed dynamically via sensing the packet arrival time. In order to guarantee the delay performance of network traffic, the sub-cycle division strategy is designed to transmit the real-time traffic preferentially. Finally, simulation results verify that the proposed scheme is able to reduce the energy consumption of the network while maintaining the traffic delay performance.

  3. ONU discovery using multiple subchannels for seamless service support in long-reach OFDMA-PON.

    Science.gov (United States)

    Bang, Hakjeon; Doo, Kyeong-Hwan; Lee, Jonghyun; Lee, Sangsoo

    2014-09-08

    In a passive optical network (PON), discovery is a process that detects and registers newly connected optical network units (ONUs). A long-reach PON requires a longer discovery window, e.g., at least 1 ms for 100 km, due to the increased round-trip time between an optical line terminal (OLT) and an ONU. The longer discovery window consumes more network resources and issues longer service-interruption time. From this motivation, for a long-reach orthogonal frequency-division multiple access (OFDMA)-PON, we propose a discovery method using multiple subchannels, where each subchannel consists of one or several subcarrier(s). Compared to discovery using a single channel, the proposed discovery method can increase the number of successfully detected ONUs at the same resources (i.e., for a discovery window) and ensure seamless service support to already registered ONUs, by assigning some subchannels for discovery and the remainder for data transmission. We analyze the discovery efficiency (i.e., the number of successfully detected ONUs in the discovery process) based on a probability and optimize the discovery window size by numerical simulations.

  4. Electrical Characterization of Ultrathin RF-Sputtered LiPON Layers for Nanoscale Batteries.

    Science.gov (United States)

    Put, Brecht; Vereecken, Philippe M; Meersschaut, Johan; Sepúlveda, Alfonso; Stesmans, Andre

    2016-03-23

    Ultrathin lithium phosphorus oxynitride glass (LiPON) films with thicknesses down to 15 nm, deposited by reactive sputtering in nitrogen plasma, were found to be electronically insulating. Such ultrathin electrolyte layers could lead to high power outputs and increased battery energy densities. The effects of stoichiometry, film thickness, and substrate material on the ionic conductivity were investigated. As the amount of nitrogen in the layers increased, the activation energy of the ionic conductivity decreased from 0.63 to 0.53 eV, leading to a maximum conductivity of 1 × 10(-6) S/cm. No dependence of the ionic conductivity on the film thickness or substrate material could be established. A detailed analysis of the equivalent circuit model used to fit the impedance data is provided. Polarization measurements were performed to determine the electronic leakage in these ultrathin films. A 15-nm LiPON layer on a TiN substrate showed electronically insulating properties with electronic resistivity values around 10(15) Ω·cm. To our knowledge, this is the thinnest RF-sputtered LiPON layer shown to be electronically insulating while retaining good ionic conductivity.

  5. CYP/PON genetic variations as determinant of organophosphate ...

    Indian Academy of Sciences (India)

    The focus is on gene–environment interaction, highlighting the consequences and factors that may halt the biotransformation of some pesticides and change their ... Centre for Environmental Science and Technology,Central University of Punjab, Bathinda 151001, India; Centre for Human Genetics and Molecular Medicine, ...

  6. CYP/PON genetic variations as determinant of organophosphate ...

    Indian Academy of Sciences (India)

    GURPREET KAUR

    by CYP3A4 at higher concentrations in the human liver. (Tang et al. 2001). The OPs named chlorpyrifos, malathion and diazinon gets converted to more toxic forms through. CYP metabolism to chlorpyrifos–oxon, malathion–oxon and diazinon–oxon, respectively (Poet et al. 2003; Buratti et al. 2005). Further, the chlorpyrifos ...

  7. Dietary antioxidants (selenium and N-acetylcysteine) modulate paraoxonase 1 (PON1) in PCB 126-exposed rats.

    Science.gov (United States)

    Shen, Hua; Li, Miao; Wang, Bingxuan; Lai, Ian K; Robertson, Larry W; Ludewig, Gabriele

    2014-05-01

    Environmental pollutants polychlorinated biphenyls (PCBs), especially dioxin-like PCBs, cause oxidative stress and associated toxic effects, including cancer and possibly atherosclerosis. We previously reported that PCB 126, the most potent dioxin-like PCB congener, not only decreases antioxidants such as hepatic selenium (Se), Se-dependent glutathione peroxidase, and glutathione (GSH) but also increases levels of the antiatherosclerosis enzyme paraoxonase 1 (PON1) in liver and serum. To probe the interconnection of these three antioxidant systems, Se, GSH, and PON1, we examined the influence of varying levels of dietary Se and N-acetylcysteine (NAC), a scavenger of reactive oxygen species (ROS) and precursor for GSH synthesis, on PON1 in the absence and presence of PCB 126 exposure. Male Sprague-Dawley rats, fed diets with differing Se levels (0.02, 0.2, or 2 ppm) or NAC (1%), were treated with a single intraperitoneal injection of corn oil or various doses of PCB 126 and euthanized 2 weeks later. PCB 126 significantly increased liver PON1 mRNA, protein level and activity, and serum PON1 activity in all dietary groups but did not consistently increase thiobarbituric acid levels (thiobarbituric acid reactive substances, TBARS), an indicator of lipid oxidation and oxidative stress, in liver or serum. Inadequate (high or low) dietary Se decreased baseline and PCB 126-induced aryl hydrocarbon receptor (AhR) expression but further increased PCB 126-induced cytochrome P450 1A1 (CYP1A1) expression, the enzyme believed to be the cause for PCB 126-induced oxidative stress. In addition, a significant inverse relationship was observed not only between dietary Se levels and PON1 mRNA and PON1 activity but also with TBARS levels in the liver, suggesting significant antioxidant protection from dietary Se. NAC lowered serum baseline TBARS levels in controls and increased serum PON1 activity but lowered liver PON1 activities in animals treated with 1 μmol/kg PCB 126, suggesting

  8. ESTABLISHMENT OF PARAOXONASE AND ARYLESTERASE ACTIVITY OF PARAOXONASE 1 (PON1 IN DEPENDENCE ON 55(L/M AND 192(Q/R DNA POLYMORPHISM IN ADULT PEOPLE WITH DOWN SYNDROME

    Directory of Open Access Journals (Sweden)

    Pavel SÝKORA

    2010-04-01

    Full Text Available Human serum paraoxonase 1 is a calcium-dependent esterase located on high density lipoproteins (HDL. It inhibits LDL peroxidation and hydrolysis of oxide forms of phospholipides and therefore significantly affects the development of ateroscletosis. The aim of this study was to establish the paraoxonase and arylesterase activity of PON1 in adult people with Down syndrome (DS. Adults with DS (10 men and 10 women ages 16 to 37 years participated and were compared to a control group (10 men and 10 women age ranging from 17 to 45 years. The 55(L/M and 192(Q/R DNA polymorphism (PCR-RFLP method and paraoxonase and arylesterase activity was investigated in every patient. The results showed the reduction of PON1 activity in people with DS, in contrast to the decreased development of atherosclerosis in DS. Therefore it can be concluded, that PON1 does not have a direct effect on the lower prevalence of atherosclerosis in people with DS.

  9. Association of genetic polymorphisms of PON1 and CETP with the presence of metabolic syndrome; the effects of genotypes on their serum activity and concentrations

    Directory of Open Access Journals (Sweden)

    Behdokht Fathi Dizaji

    2018-01-01

    Conclusions: There were no associations between the PON1 polymorphisms, or haplotypes with MetS. There was an association between CETPrs5882 and metabolic syndrome. AA genotype of CETPrs5882 appeared to be protective against MetS in our studied population. There were no association between the PON1 and CETP polymorphisms with PON1enzymatic activities and CETP protein levels at base line and after curcumin supplementation.

  10. Maternal exposure to floricultural work during pregnancy, PON1 Q192R polymorphisms and the risk of low birth weight

    Energy Technology Data Exchange (ETDEWEB)

    Moreno-Banda, G.; Blanco-Munoz, J. [Population Health Research Center, National Institute of Public Health, Avenida Universidad 655, Colonia Santa Maria Ahuacatitlan, 62508 Cuernavaca, Morelos (Mexico); Lacasana, M., E-mail: marina.lacasana.easp@juntadeandalucia.es [Andalusian School of Public Health, Campus Universitario de la Cartuja, Cuesta del Observatorio, 4, 18080 Granada (Spain); CIBER of Epidemiology and Public Health (CIBERESP) (Spain); Rothenberg, S.J. [Population Health Research Center, National Institute of Public Health, Avenida Universidad 655, Colonia Santa Maria Ahuacatitlan, 62508 Cuernavaca, Morelos (Mexico); Center of Research and Advanced Studies, National Institute Polytechnic, Department of Toxicology, Av, Instituto Politecnico Nacional No. 2508, Col. San Pedro Zacatenco, Deleg. Gustavo A. Madero, 07360 Mexico, D.F. (Mexico); Aguilar-Garduno, C. [Andalusian School of Public Health, Campus Universitario de la Cartuja, Cuesta del Observatorio, 4, 18080 Granada (Spain); Andalusian Observatory of Environmental Health, Campus Universitario de la Cartuja, Cuesta del Observatorio, 4, 18080 Granada (Spain); Gamboa, R. [Department of Physiology, National Institute of Cardiology ' Ignacio Chavez' , Juan Badiano 4, Section XVI, 14080, Mexico DF (Mexico); Perez-Mendez, O. [Department of Molecular Biology and cardiovascular Diseases Genomic and Proteomic, National Institute of Cardiology ' Ignacio Chavez' , Juan Badiano 4, Section XVI, 14080, Mexico DF (Mexico)

    2009-10-15

    Background: Although there is evidence from animal studies of impaired reproductive function by exposure to organophosphates (OP), the effects on birth weight have not been sufficiently evaluated in epidemiological studies. Paraoxonase (PON1) detoxifies organophosphates by cleavage of active oxons. Some PON1 gene polymorphisms could reduce the enzyme activity and increase susceptibility to OP toxicity. Objective: To assess the association between maternal exposure to floriculture during pregnancy and the risk of low birth weight (< 2500 g) in their offspring, as well as to evaluate the interaction between this exposure and maternal genotype for PON1 Q192R polymorphisms. Materials and methods: A cross sectional study was carried out in two Mexican states (States of Mexico and Morelos) with high frequencies of greenhouse activity. We interviewed and collected blood samples from 264 females (floriculturists or partners of floricultural workers) who became pregnant during the 10 years prior to the interview. The questionnaire measured socioeconomic characteristics, tobacco and alcohol consumption, diseases and occupational and reproductive history. We also applied a food frequency questionnaire. Information was obtained pertaining to 467 pregnancies. DNA was extracted from white cells, and PON1 genotype was determined by Restriction Fragment Length Polymorphism for Q192R polymorphisms. Results were analyzed with generalized estimating equations models. Results: After adjusting for potential confounders, we detected a statistically significant interaction between maternal exposure to flower growing work during pregnancy and PON1 Q192R polymorphisms on risk of low birth weight. The risk of having a baby with LBW is nearly six times higher if a mother is a floriculture worker during pregnancy and has PON1 192RR genotype (OR 5.93, 95% CI 1.28, 27.5). Conclusion: These results suggest that the interaction between maternal floriculture work during pregnancy and 192RR PON1

  11. Reduced serum paraoxonase 1 (PON1 activity in patients with schizophrenia treated with olanzapine but not quetiapine

    Directory of Open Access Journals (Sweden)

    Ünsal C

    2013-10-01

    Full Text Available Cüneyt Ünsal,1 Yakup Albayrak,1 Neslihan Albayrak,2 Murat Kuloğlu,3 Kenji Hashimoto41Department of Psychiatry, Namik Kemal University School of Medicine, Tekirdag, Turkey; 2Department of Cardiology, Kirklareli State Hospital, Kirklareli, Turkey; 3Department of Psychiatry, Akdeniz University School of Medicine, Antalya, Turkey; 4Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, JapanBackground: Second generation antipsychotics (SGAs are currently the most prescribed drugs in the treatment of schizophrenia. Despite their advantages, which include greater improvement in negative symptoms, cognitive function, prevention of deterioration, quality of life, and fewer extrapyramidal symptoms, the concern regarding metabolic abnormalities which might cause cardiovascular diseases during treatment with SGAs have been rising. Paraoxonase 1 (PON1 is an enzyme mostly located on high-density lipoprotein particles, and has been shown to protect or inhibit lipoprotein oxidation. Growing evidence suggests that PON1 plays a key role in the pathophysiology of atherosclerosis.Methods: In the present study, we measured serum PON1 activity and serum levels of total cholesterol (TC, triglyceride, high-density lipoprotein cholesterol (HDL-C, and low-density lipoprotein cholesterol (LDL-C in patients with schizophrenia, who had been treated with either olanzapine or quetiapine, and in healthy controls. Thirty five patients who had been treated with olanzapine, 29 patients who had been treated with quetiapine, and 32 age, sex, and smoking status-matched healthy control (HC participants were enrolled. Serum PON1 activity and serum levels of TC, triglyceride, HDL-C, and LDL-C were measured.Results: Serum PON1 activity in the olanzapine group was significantly lower than that of HC and quetiapine groups. Furthermore, serum levels of TC and LDL-C in the olanzapine group were significantly higher than those of quetiapine and HC

  12. Architecture of interstitial nodal spaces in the rodent renal inner medulla

    Science.gov (United States)

    Gilbert, Rebecca L.

    2013-01-01

    Every collecting duct (CD) of the rat inner medulla is uniformly surrounded by about four abutting ascending vasa recta (AVR) running parallel to it. One or two ascending thin limbs (ATLs) lie between and parallel to each abutting AVR pair, opposite the CD. These structures form boundaries of axially running interstitial compartments. Viewed in transverse sections, these compartments appear as four interstitial nodal spaces (INSs) positioned symmetrically around each CD. The axially running compartments are segmented by interstitial cells spaced at regular intervals. The pairing of ATLs and CDs bounded by an abundant supply of AVR carrying reabsorbed water, NaCl, and urea make a strong argument that the mixing of NaCl and urea within the INSs and countercurrent flows play a critical role in generating the inner medullary osmotic gradient. The results of this study fully support that hypothesis. We quantified interactions of all structures comprising INSs along the corticopapillary axis for two rodent species, the Munich-Wistar rat and the kangaroo rat. The results showed remarkable similarities in the configurations of INSs, suggesting that the structural arrangement of INSs is a highly conserved architecture that plays a fundamental role in renal function. The number density of INSs along the corticopapillary axis directly correlated with a loop population that declines exponentially with distance below the outer medullary-inner medullary boundary. The axial configurations were consistent with discrete association between near-bend loop segments and INSs and with upper loop segments lying distant from INSs. PMID:23825077

  13. Targeted delivery of solutes and oxygen in the renal medulla: role of microvessel architecture.

    Science.gov (United States)

    Pannabecker, Thomas L; Layton, Anita T

    2014-09-15

    Renal medullary function is characterized by corticopapillary concentration gradients of various molecules. One example is the generally decreasing axial gradient in oxygen tension (Po2). Another example, found in animals in the antidiuretic state, is a generally increasing axial solute gradient, consisting mostly of NaCl and urea. This osmolality gradient, which plays a principal role in the urine concentrating mechanism, is generally considered to involve countercurrent multiplication and countercurrent exchange, although the underlying mechanism is not fully understood. Radial oxygen and solute gradients in the transverse dimension of the medullary parenchyma have been hypothesized to occur, although strong experimental evidence in support of these gradients remains lacking. This review considers anatomic features of the renal medulla that may impact the formation and maintenance of oxygen and solute gradients. A better understanding of medullary architecture is essential for more clearly defining the compartment-to-compartment flows taken by fluid and molecules that are important in producing axial and radial gradients. Preferential interactions between nephron and vascular segments provide clues as to how tubular and interstitial oxygen flows contribute to safeguarding active transport pathways in renal function in health and disease. Copyright © 2014 the American Physiological Society.

  14. Quantitation of iodine-123 MIBG uptake by normal adrenal medulla in hypertensive patients

    Energy Technology Data Exchange (ETDEWEB)

    Bomanji, J.; Flatman, W.D.; Horne, T.; Fettich, J.; Britton, K.E.; Ross, G.; Besser, G.M.

    1987-03-01

    Eighteen hypertensive patients with a clinical suspicion of pheochromocytoma and raised or borderline raised plasma catecholamine and urinary vanillyl mandelic acid (VMA) levels were studied by scintigraphy using /sup 123/I-labeled metaiodobenzylguanidine (MIBG). None of these patients had any scintigraphic evidence of pheochromocytoma at the time of study or on subsequent clinical follow-up. A quantitative approach was taken to calculate the adrenal medullary uptake of (/sup 123/I)MIBG in these patients. Three different methods of quantitation were evaluated using data acquired from an anthropomorphic phantom and analysed by three independent observers. In the patient studies 34 out of 35 adrenal medullas were visualized with uptake in the range of 0.01-0.22% of the administered dose 22 hr postinjection which was calculated using the preferred quantitation method. This is an appropriate control group range for comparison with patients who have proven norepinephrine and epinephrine secreting tumors. A quantitative approach to (/sup 123/I)MIBG imaging provides an important tool for studying adrenomedullary pathophysiology.

  15. Oxidative Stress in the Rostral Ventrolateral Medulla Contributes To Cardiovascular Regulation in Preeclampsia

    Science.gov (United States)

    Yan, Jiu-Qiong; Huang, Fang; Hao, Fan; Su, Xiao-Ling; Meng, Qi; Xu, Ming-Juan

    2017-01-01

    Background: It has been demonstrated that preeclampsia, a pregnancy-specific hypertension disorder, is characterized by high blood pressure (BP) and sympathetic overactivity. Increased reactive oxygen species (ROS) in the rostral ventrolateral medulla (RVLM), a key region for controlling sympathetic tone, has been reported to contribute to high level of BP and sympathetic outflow. The aim of the present study was to determine the role of the RVLM ROS in mediating the preeclampsia-associated cardiovascular dysfunction. Methods: The animal model of preeclampsia was produced by administration of desoxycorticosterone acetate (DOCA) to pregnant rats. Results: Compared with normal pregnant rats without DOCA treatment (NP), the protein concentration and norepinephrine excretion in 24-h urine, as well as BP in pregnant rats with DOCA treatment (PDS) were significantly increased. The levels of superoxide anion and the protein expression of NADPH oxidase subtype (NOX4) in the RVLM were significantly increased in PDS than in NP groups. Furthermore, microinjection of the superoxide dismutase (SOD) mimic Tempol (5 nmol) into the RVLM significantly decreased BP, heart rate, and renal sympathetic never activity in PDS but not in NP group. Conclusion: The present data suggest that high BP and sympathetic overactivity in preeclampsia rats is associated with increased oxidative stress in the RVLM via upregulation of NOX4 expression. PMID:29085302

  16. B and C types natriuretic peptides modify norepinephrine uptake and release in the rat adrenal medulla.

    Science.gov (United States)

    Vatta, M S; Presas, M F; Bianciotti, L G; Rodriguez-Fermepin, M; Ambros, R; Fernandez, B E

    1997-01-01

    We have previously reported that atrial natriuretic factor (ANF) modulates adrenomedullar norepinephrine (NE) metabolism. On this basis, the aim of the present work was to study the effects of B and C types natriuretic peptides (BNP and CNP) on the uptake, intracellular distribution and release of 3H-NE. Experiments were carried out in rat adrenal medulla slices incubated "in vitro." Results showed that 100 nM of both, CNP and BNP, enhanced total and neuronal NE uptake. Both peptides (100 nM) caused a rapid increase in NE uptake during the first minute, which was sustained for 60 min. NE intracellular distribution was only modified by CNP (100 nM), which increased the granular fraction and decreased the cytosolic pool. On the other hand, spontaneous as well as evoked (KCl) NE release, was decreased by BNP and CNP (50 and 100 nM for spontaneous release and 1, 10, 50 and 100 nM for evoked output). The present results suggest that BNP and CNP may regulate catecholamine secretion and modulate adrenomedullary biological actions mediated by catecholamines, such as blood arterial pressure, smooth muscle tone, and metabolic activities.

  17. Developmental competence of oocytes isolated from surplus medulla tissue in connection with cryopreservation of ovarian tissue for fertility preservation

    DEFF Research Database (Denmark)

    Wilken-Jensen, Helle N; Kristensen, Stine G; Jeppesen, Janni V

    2014-01-01

    OBJECTIVE: Evaluating the developmental competence of immature oocytes collected from surplus medulla tissue in connection with ovarian tissue cryopreservation for fertility preservation. DESIGN: Cohort comparative study. SETTING: University laboratory in Denmark from 2011-2012. POPULATION: 69...... girls and women (0-38 years of age) who each had one ovary cryopreserved for fertility preservation. METHODS: Ovaries were obtained directly from the local hospital or from collaborating hospitals (two to five hours' transport on ice). Immature oocytes were aspirated from large antral follicles visible...... on the ovaries, and collected from the saline solution, containing surplus medulla tissue, following dissection of the ovarian cortical tissue for cryopreservation. The immature oocytes were cultured for 48 h in an Embryoscope™ Time-lapse System or in culture dishes overlaid with liquid paraffin using commercial...

  18. Bidirectional multi-optical line terminals incorporated converged WSN-PON network using M/M/1 queuing

    Science.gov (United States)

    Kumar, Love; Sharma, Vishal; Singh, Amarpal

    2017-12-01

    Wireless Sensor Networks (WSNs) have an assortment of application areas, for instance, civil, military, and video surveillance with restricted power resources and transmission link. To accommodate the massive traffic load in hefty sensor networks is another key issue. Subsequently, there is a necessity to backhaul the sensed information of such networks and prolong the transmission link to access the distinct receivers. Passive Optical Network (PON), a next-generation access technology, comes out as a suitable candidate for the convergence of the sensed data to the core system. The earlier demonstrated work with single-OLT-PON introduces an overloaded buffer akin to video surveillance scenarios. In this paper, to combine the bandwidth potential of PONs with the mobility capability of WSNs, the viability for the convergence of PONs and WSNs incorporating multi-optical line terminals is demonstrated to handle the overloaded OLTs. The existing M/M/1 queue theory with interleaving polling with adaptive cycle time as dynamic bandwidth algorithm is used to shun the probability of packets clash. Further, the proposed multi-sink WSN and multi-OLT PON converged structure is investigated in bidirectional mode analytically and through computer simulations. The observations establish the proposed structure competent to accommodate the colossal data traffic through less time consumption.

  19. PON ring architectures for truly shared LAN capability and dynamic bandwidth allocation for fiber wireless (FiWi) applications

    Science.gov (United States)

    Madamopoulos, N.; Pathak, Bhadresh; Antoniades, N.; Ummy, Muhammad A.

    2009-01-01

    Due to reduced operational and equipment costs, time division multiplexed (TDM)-based passive Optical Network (PON) access solutions including Gigabit PON (GPON) and Ethernet PON (EPON) have been widely accepted as a viable technology for the implementation of fiber-to-the-x (FTTx) solutions, and are being deployed globally. Users are increasingly requiring more bandwidth for high end applications and at the same time greater mobility. The convergence of fiber and wireless systems is seen as the optimum solution to offer the combination of the fiber capacity and the wireless mobility. PON has been proposed as a backhaul for wireless. Typical architectures are traditionally deployed as tree topologies. However, tree-based topologies have several inherent drawbacks such as inability to support a truly shared Local Area Network (LAN) capability among end users. In this paper, we propose scalable ring-based architectures that offer truly shared LAN capability as well as dynamic bandwidth allocation. These architectures are ring-based as well as hybrid, combination of tree-based and ring-based. These flexible architectures can be used as the back-haul to wireless by incorporating the base stations in the ONU locations. Our proposed hybrid PON ring architecture is scalable to 78 ONUs without the use of any amplifiers and in addition, the basic ring architecture and in turn the hybrid one is transparent to protocols and data rates and hence allows for greater BW flexibility as well as greater number of serviced end-users.

  20. Synergistic convergence and split pons in horizontal gaze palsy and progressive scoliosis in two sisters

    Directory of Open Access Journals (Sweden)

    Jain Nitin

    2011-01-01

    Full Text Available Synergistic convergence is an ocular motor anomaly where on attempted abduction or on attempted horizontal gaze, both the eyes converge. It has been related to peripheral causes such as congenital fibrosis of extraocular muscles (CFEOM, congenital cranial dysinnervation syndrome, ocular misinnervation or rarely central causes like horizontal gaze palsy with progressive scoliosis, brain stem dysplasia. We hereby report the occurrence of synergistic convergence in two sisters. Both of them also had kyphoscoliosis. Magnetic resonance imaging (MRI brain and spine in both the patients showed signs of brain stem dysplasia (split pons sign differing in degree (younger sister had more marked changes.

  1. SPARCL1-containing neurons in the human brainstem and sensory ganglion.

    Science.gov (United States)

    Hashimoto, Naoya; Sato, Tadasu; Yajima, Takehiro; Fujita, Masatoshi; Sato, Ayumi; Shimizu, Yoshinaka; Shimada, Yusuke; Shoji, Noriaki; Sasano, Takashi; Ichikawa, Hiroyuki

    2016-06-01

    Secreted protein, acidic and rich in cysteine-like 1 (SPARCL1) is a member of the osteonectin family of proteins. In this study, immunohistochemistry for SPARCL1 was performed to obtain its distribution in the human brainstem, cervical spinal cord, and sensory ganglion. SPARCL1-immunoreactivity was detected in neuronal cell bodies including perikarya and proximal dendrites, and the neuropil. The motor nuclei of the IIIrd, Vth, VIth, VIIth, IXth, Xth, XIth, and XIIth cranial nerves and spinal nerves contained many SPARCL1-immunoreactive (-IR) neurons with medium-sized to large cell bodies. Small and medium-sized SPARCL1-IR neurons were distributed in sensory nuclei of the Vth, VIIth, VIIIth, IXth, and Xth cranial nerves. In the medulla oblongata, the dorsal column nuclei also had small to medium-sized SPARCL1-IR neurons. In addition, SPARCL1-IR neurons were detected in the nucleus of the trapezoid body and pontine nucleus within the pons and the arcuate nucleus in the medulla oblongata. In the cervical spinal cord, the ventral horn contained some SPARCL1-IR neurons with large cell bodies. These findings suggest that SPARCL1-containing neurons function to relay and regulate motor and sensory signals in the human brainstem. In the dorsal root (DRG) and trigeminal ganglia (TG), primary sensory neurons contained SPARCL1-immunoreactivity. The proportion of SPARCL1-IR neurons in the TG (mean ± SD, 39.9 ± 2.4%) was higher than in the DRG (30.6 ± 2.1%). SPARCL1-IR neurons were mostly medium-sized to large (mean ± SD, 1494.5 ± 708.3 μm(2); range, 320.4-4353.4 μm(2)) in the DRG, whereas such neurons were of various cell body sizes in the TG (mean ± SD, 1291.2 ± 532.8 μm(2); range, 209.3-4326.4 μm(2)). There appears to be a SPARCL1-containing sensory pathway in the ganglion and brainstem of the spinal and trigeminal nervous systems.

  2. Performance analysis of TCP traffic and its influence on ONU's energy saving in energy efficient TDM-PON

    Science.gov (United States)

    Alaelddin, Fuad Yousif Mohammed; Newaz, S. H. Shah; Lee, Joohyung; Uddin, Mohammad Rakib; Lee, Gyu Myoung; Choi, Jun Kyun

    2015-12-01

    The majority of the traffic over the Internet is TCP based, which is very sensitive to packet loss and delay. Existing research efforts in TDM-Passive Optical Networks (TDM-PONs) mostly evaluate energy saving and traffic delay performances under different energy saving solutions. However, to the best of our knowledge, how energy saving mechanisms could affect TCP traffic performance in TDM-PONs has hardly been studied. In this paper, by means of our state-of-art OPNET Modular based TDM-PON simulator, we evaluate TCP traffic delay, throughput, and Optical Network Unit (ONU) energy consumption performances in a TDM-PON where energy saving mechanisms are employed in ONUs. Here, we study the performances under commonly used energy saving mechanisms defined in standards for TDM-PONs: cyclic sleep and doze mode. In cyclic sleep mode, we evaluate the performances under two well-known sleep interval length deciding algorithms (i.e. fixed sleep interval (FSI) and exponential sleep interval deciding (ESID)) that an OLT uses to decide sleep interval lengths for an ONU. Findings in this paper put forward the strong relationship among TCP traffic delay, throughput and ONU energy consumption under different sleep interval lengths. Moreover, we reveal that under high TCP traffic, both FSI and ESID will end up showing similar delay, energy and throughput performance. Our findings also show that doze mode can offer better TCP throughput and delay performance at the price of consuming more energy than cyclic sleep mode. In addition, our results provide a glimpse on understanding at what point doze mode becomes futile in improving energy saving of an ONU under TCP traffic. Furthermore, in this paper, we highlight important research issues that should be studied in future research to maximize energy saving in TDM-PONs while meeting traffic Quality of Service requirements.

  3. Trigeminal-Rostral Ventromedial Medulla circuitry is involved in orofacial hyperalgesia contralateral to tissue injury

    Directory of Open Access Journals (Sweden)

    Chai Bryan

    2012-10-01

    Full Text Available Abstract Background Our previous studies have shown that complete Freund’s adjuvant (CFA-induced masseter inflammation and microinjection of the pro-inflammatory cytokine interleukin-1β (IL-1β into the subnucleus interpolaris/subnucleus caudalis transition zone of the spinal trigeminal nucleus (Vi/Vc can induce contralateral orofacial hyperalgesia in rat models. We have also shown that contralateral hyperalgesia is attenuated with a lesion of the rostral ventromedial medulla (RVM, a critical site of descending pain modulation. Here we investigated the involvement of the RVM-Vi/Vc circuitry in mediating contralateral orofacial hyperalgesia after an injection of CFA into the masseter muscle. Results Microinjection of the IL-1 receptor antagonist (5 nmol, n=6 into the ipsilateral Vi/Vc attenuated the CFA-induced contralateral hyperalgesia but not the ipsilateral hyperalgesia. Intra-RVM post-treatment injection of the NK1 receptor antagonists, RP67580 (0.5-11.4 nmol and L-733,060 (0.5-11.4 nmol, attenuated CFA-induced bilateral hyperalgesia and IL-1β induced bilateral hyperalgesia. Serotonin depletion in RVM neurons prior to intra-masseter CFA injection prevented the development of contralateral hyperalgesia 1–3 days after CFA injection. Inhibition of 5-HT3 receptors in the contralateral Vi/Vc with direct microinjection of the select 5-HT3 receptor antagonist, Y-25130 (2.6-12.9 nmol, attenuated CFA-induced contralateral hyperalgesia. Lesions to the ipsilateral Vc prevented the development of ipsilateral hyperalgesia but did not prevent the development of contralateral hyperalgesia. Conclusions These results suggest that the development of CFA-induced contralateral orofacial hyperalgesia is mediated through descending facilitatory mechanisms of the RVM-Vi/Vc circuitry.

  4. Cerebrospinal Fluid Hypernatremia Elevates Sympathetic Nerve Activity and Blood Pressure via the Rostral Ventrolateral Medulla.

    Science.gov (United States)

    Stocker, Sean D; Lang, Susan M; Simmonds, Sarah S; Wenner, Megan M; Farquhar, William B

    2015-12-01

    Elevated NaCl concentrations of the cerebrospinal fluid increase sympathetic nerve activity (SNA) in salt-sensitive hypertension. Neurons of the rostral ventrolateral medulla (RVLM) play a pivotal role in the regulation of SNA and receive mono- or polysynaptic inputs from several hypothalamic structures responsive to hypernatremia. Therefore, the present study investigated the contribution of RVLM neurons to the SNA and pressor response to cerebrospinal fluid hypernatremia. Lateral ventricle infusion of 0.15 mol/L, 0.6 mol/L, and 1.0 mol/L NaCl (5 µL/10 minutes) produced concentration-dependent increases in lumbar SNA, adrenal SNA, and arterial blood pressure, despite no change in splanchnic SNA and a decrease in renal SNA. Ganglionic blockade with chlorisondamine or acute lesion of the lamina terminalis blocked or significantly attenuated these responses, respectively. RVLM microinjection of the gamma-aminobutyric acid (GABAA) agonist muscimol abolished the sympathoexcitatory response to intracerebroventricular infusion of 1 mol/L NaCl. Furthermore, blockade of ionotropic glutamate, but not angiotensin II type 1, receptors significantly attenuated the increase in lumbar SNA, adrenal SNA, and arterial blood pressure. Finally, single-unit recordings of spinally projecting RVLM neurons revealed 3 distinct populations based on discharge responses to intracerebroventricular infusion of 1 mol/L NaCl: type I excited (46%; 11/24), type II inhibited (37%; 9/24), and type III no change (17%; 4/24). All neurons with slow conduction velocities were type I cells. Collectively, these findings suggest that acute increases in cerebrospinal fluid NaCl concentrations selectively activate a discrete population of RVLM neurons through glutamate receptor activation to increase SNA and arterial blood pressure. © 2015 American Heart Association, Inc.

  5. The inhibitory effect of granisetron on ventrolateral medulla neuron responses to colorectal distension in rats.

    Science.gov (United States)

    Panteleev, Sergey S; Martseva, Alexandra А; Lyubashina, Olga А

    2015-02-15

    Irritable bowel syndrome (IBS) is one of the most widespread functional gastrointestinal disorders characterized by abdominal pain. A key pathophysiological mechanism of abdominal pain is associated with disturbances of serotonergic transmission in feedback control loops of endogenous pain modulation in which the ventrolateral medulla (VLM) plays an important role. The receptors to serotonin (5-HT), and particularly the serotonin 3 (5-HT3) receptors have been extensively used as a potential target for abdominal pain treatment of IBS patients due to antinociceptive features of the 5-HT3 receptor antagonists. The precise mechanisms underlying the antinociceptive action of these antagonists remain unclear. The main objective of our study was to evaluate the involvement of the 5-HT3 receptors in abdominal pain transmission within the VLM. Experiments were carried out on urethane-anaesthetized rats using the animal model of abdominal pain. Noxious colorectal distension (CRD) with a pressure of 80mmHg induced a significant increase in VLM neuron-evoked activity and depressor reactions (171.1±12.7% and 64±1.8% to baseline, accordingly). Selective blockade of the 5-HT3 receptors with granisetron at doses of 1.0 or 2.0mg/kg (i.v) resulted in long-lasting (90min) dose-dependent inhibition of VLM neuron-evoked activity and depressor reactions. When brainstem dorsal surface applications of granisetron (10 or 20µM) were used, the changes were more pronounced. These results suggest involvement of the 5-HT3 receptors in abdominal pain transmission within the VLM, which will be discussed in relation to the central antinociceptive effect of granisetron. Copyright © 2015 Elsevier B.V. All rights reserved.

  6. Multi-granularity Bandwidth Allocation for Large-Scale WDM/TDM PON

    Science.gov (United States)

    Gao, Ziyue; Gan, Chaoqin; Ni, Cuiping; Shi, Qiongling

    2017-12-01

    WDM (wavelength-division multiplexing)/TDM (time-division multiplexing) PON (passive optical network) is being viewed as a promising solution for delivering multiple services and applications, such as high-definition video, video conference and data traffic. Considering the real-time transmission, QoS (quality of services) requirements and differentiated services model, a multi-granularity dynamic bandwidth allocation (DBA) in both domains of wavelengths and time for large-scale hybrid WDM/TDM PON is proposed in this paper. The proposed scheme achieves load balance by using the bandwidth prediction. Based on the bandwidth prediction, the wavelength assignment can be realized fairly and effectively to satisfy the different demands of various classes. Specially, the allocation of residual bandwidth further augments the DBA and makes full use of bandwidth resources in the network. To further improve the network performance, two schemes named extending the cycle of one free wavelength (ECoFW) and large bandwidth shrinkage (LBS) are proposed, which can prevent transmission from interruption when the user employs more than one wavelength. The simulation results show the effectiveness of the proposed scheme.

  7. Direct-detection optical OFDM superchannel for long-reach PON using pilot regeneration.

    Science.gov (United States)

    Hu, Rong; Yang, Qi; Xiao, Xiao; Gui, Tao; Li, Zhaohui; Luo, Ming; Yu, Shaohua; You, Shanhong

    2013-11-04

    We demonstrate a novel long-reach PON downstream scheme based on the regenerated pilot assisted direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) superchannel transmission. We use the optical comb source to form DDO-OFDM superchannel, and reserve the center carrier as a seed pilot. The seed pilot is further tracked and reused to generate multiple optical carriers at the local exchange. Each regenerated pilot carrier is selected to beat with an adjacent OFDM sub-band at ONU, so that the electrical bandwidth limitation can be much released compared to the conventional DDO-OFDM superchannel detection. With the proposed proof-of-concept architecture, we experimentally demonstrated a 116.7 Gb/s superchannel OFDM-PON system with transmission reach of 100 km, and 1:64 splitting ratio. We analyze the impact of carrier-to-sideband power ratio (CSPR) on system performance. The experiment result shows that, 5 dB power margin is still remained at ONU using such technique.

  8. Directly-Modulated VCSELs for 2x2 MIMO-OFDM Radio over Fiber in WDM-PON

    DEFF Research Database (Denmark)

    Binti Othman, Maisara; Deng, Lei; Pang, Xiaodan

    2011-01-01

    We demonstrate directly- modulated VCSELs supporting 2x2 MIMO-OFDM 5.6-GHz radio over fiber signaling over 20-km WDM-PON. Error-free signal demodulation of 64-subcarrier 4-QAM signals modulated at 198.5-Mb/s is achieved after fiber and 2-m indoor wireless transmission.......We demonstrate directly- modulated VCSELs supporting 2x2 MIMO-OFDM 5.6-GHz radio over fiber signaling over 20-km WDM-PON. Error-free signal demodulation of 64-subcarrier 4-QAM signals modulated at 198.5-Mb/s is achieved after fiber and 2-m indoor wireless transmission....

  9. Full-duplex transmission of 256-QAM WiMAX signals over an 80-km long-reach PON

    DEFF Research Database (Denmark)

    Prince, Kamau; Osadchiy, Alexey Vladimirovich; Tafur Monroy, Idelfonso

    2009-01-01

    We present bi-directional transmission of WiMAXcompliant signaling over an 80-km PON, using a single optical wavelength. Colorless, bi-directional transmission of 256-QAM modulation on a 2.4-GHz RF carrier was achieved at 100- Mb/s (downlink) and 64-Mb/s (uplink).......We present bi-directional transmission of WiMAXcompliant signaling over an 80-km PON, using a single optical wavelength. Colorless, bi-directional transmission of 256-QAM modulation on a 2.4-GHz RF carrier was achieved at 100- Mb/s (downlink) and 64-Mb/s (uplink)....

  10. Bidirectional 120 Gbps SDM-WDM-PON with colourless ONU using 10 Gbps optical components without DSP

    DEFF Research Database (Denmark)

    Hu, Hao; Asif, Rameez; Ye, Feihong

    2016-01-01

    We demonstrate an SDM-WDM-PON system with symmetric aggregated capacity of 120 Gbps (3×scores, 4×wavelengths, 10 Gbps each). The light sources are distributed through the center core of the 7-core fiber, facilitating colorless ONU.......We demonstrate an SDM-WDM-PON system with symmetric aggregated capacity of 120 Gbps (3×scores, 4×wavelengths, 10 Gbps each). The light sources are distributed through the center core of the 7-core fiber, facilitating colorless ONU....

  11. PEP-1-PON1 protein regulates inflammatory response in raw 264.7 macrophages and ameliorates inflammation in a TPA-induced animal model.

    Directory of Open Access Journals (Sweden)

    Mi Jin Kim

    Full Text Available Paraoxonase 1 (PON1 is an antioxidant enzyme which plays a central role in various diseases. However, the mechanism and function of PON1 protein in inflammation are poorly understood. Since PON1 protein alone cannot be delivered into cells, we generated a cell permeable PEP-1-PON1 protein using protein transduction domains, and examined whether it can protect against cell death in lipopolysaccharide (LPS or hydrogen peroxide (H2O2-treated Raw 264.7 cells as well as mice with 12-O-tetradecanoyl phorbol-13-acetate (TPA-induced skin inflammation. We demonstrated that PEP-1-PON1 protein transduced into Raw 264.7 cells and markedly protected against LPS or H2O2-induced cell death by inhibiting cellular reactive oxygen species (ROS levels, the inflammatory mediator's expression, activation of mitogen-activated protein kinases (MAPKs and cellular apoptosis. Furthermore, topically applied PEP-1-PON1 protein ameliorates TPA-treated mice skin inflammation via a reduction of inflammatory response. Our results indicate that PEP-1-PON1 protein plays a key role in inflammation and oxidative stress in vitro and in vivo. Therefore, we suggest that PEP-1-PON1 protein may provide a potential protein therapy against oxidative stress and inflammation.

  12. VX hydrolysis by human serum paraoxonase 1: a comparison of experimental and computational results.

    Directory of Open Access Journals (Sweden)

    Matthew W Peterson

    Full Text Available Human Serum paraoxonase 1 (HuPON1 is an enzyme that has been shown to hydrolyze a variety of chemicals including the nerve agent VX. While wildtype HuPON1 does not exhibit sufficient activity against VX to be used as an in vivo countermeasure, it has been suggested that increasing HuPON1's organophosphorous hydrolase activity by one or two orders of magnitude would make the enzyme suitable for this purpose. The binding interaction between HuPON1 and VX has recently been modeled, but the mechanism for VX hydrolysis is still unknown. In this study, we created a transition state model for VX hydrolysis (VX(ts in water using quantum mechanical/molecular mechanical simulations, and docked the transition state model to 22 experimentally characterized HuPON1 variants using AutoDock Vina. The HuPON1-VX(ts complexes were grouped by reaction mechanism using a novel clustering procedure. The average Vina interaction energies for different clusters were compared to the experimentally determined activities of HuPON1 variants to determine which computational procedures best predict how well HuPON1 variants will hydrolyze VX. The analysis showed that only conformations which have the attacking hydroxyl group of VX(ts coordinated by the sidechain oxygen of D269 have a significant correlation with experimental results. The results from this study can be used for further characterization of how HuPON1 hydrolyzes VX and design of HuPON1 variants with increased activity against VX.

  13. Transmission of OFDM wired-wireless quintuple-play services along WDM LR-PONs using centralized broadband impairment compensation.

    Science.gov (United States)

    Alves, Tiago M F; Morant, Maria; Cartaxo, Adolfo V T; Llorente, Roberto

    2012-06-18

    The simultaneous transmission of four orthogonal frequency-division multiplexing (OFDM)-based signals used to provide quintuple-play services along wavelength division multiplexing (WDM) long-reach passive optical networks (LR-PONs) is demonstrated experimentally. Particularly, the transmission performance of custom signal bearing Gigabit Ethernet data, Worldwide Interoperability for Microwave Access, Long Term Evolution and Ultra Wideband (sub-bands 2 and 3) signals is evaluated for different LR-PONs reaches, considering single-wavelength and WDM transmission, and using a centralized impairment compensation technique at the central office that is transparent to the services provided.It is shown that error vector magnitude-compliant levels are obtained for all the OFDM-based signals in WDM LR-PONs reaching 100 km and that negligible inter-channel crosstalk is obtained for a channel spacing of 100 GHz regardless the OFDM-based signal considered. The successful multi-format OFDM transmission along the 100 km-long WDM LR-PON is achieved in the absence of optical dispersion compensation or single sideband modulation, and it is enabled by the performance improvement provided by the centralized impairment compensation realized.

  14. Energy-efficient optical network units for OFDM PON based on time-domain interleaved OFDM technique.

    Science.gov (United States)

    Hu, Xiaofeng; Cao, Pan; Zhang, Liang; Jiang, Lipeng; Su, Yikai

    2014-06-02

    We propose and experimentally demonstrate a new scheme to reduce the energy consumption of optical network units (ONUs) in orthogonal frequency division multiplexing passive optical networks (OFDM PONs) by using time-domain interleaved OFDM (TI-OFDM) technique. In a conventional OFDM PON, each ONU has to process the complete downstream broadcast OFDM signal with a high sampling rate and a large FFT size to retrieve its required data, even if it employs a portion of OFDM subcarriers. However, in our scheme, the ONU only needs to sample and process one data group from the downlink TI-OFDM signal, effectively reducing the sampling rate and the FFT size of the ONU. Thus, the energy efficiency of ONUs in OFDM PONs can be greatly improved. A proof-of-concept experiment is conducted to verify the feasibility of the proposed scheme. Compared to the conventional OFDM PON, our proposal can save 17.1% and 26.7% energy consumption of ONUs by halving and quartering the sampling rate and the FFT size of ONUs with the use of the TI-OFDM technology.

  15. VCSEL-Based DWDM PON With 4 BIT/S/HZ Spectral Efficiency Using Carrierless Amplitude Phase Modulation

    DEFF Research Database (Denmark)

    Rodes Lopez, Roberto; Wieckowski, Marcin; Pham, Tien Thang

    2011-01-01

    We experimental demonstrate successful performance of VCSEL-based WDM link supporting advanced 16-level carrierless amplitude/phase modulation up to 1.25 Gbps, over 26 km SSMF with spectral efficiency of 4 bit/s/Hz for application in high capacity PONs....

  16. Carrierless amplitude phase modulation of VCSEL with 4 bit/s/Hz spectral efficiency for use in WDM-PON

    DEFF Research Database (Denmark)

    Rodes Lopez, Roberto; Wieckowski, Marcin; Pham, Tien Thang

    2011-01-01

    We experimentally demonstrate successful performance of VCSEL-based WDM link supporting advanced 16-level carrierless amplitude/phase modulation up to 1.25 Gbps, over 26 km SSMF with spectral efficiency of 4 bit/s/Hz for application in high capacity PONs. © 2011 Optical Society of America....

  17. Carrierless amplitude phase modulation of VCSEL with 4 bit/s/Hz spectral efficiency for use in WDM-PON.

    Science.gov (United States)

    Rodes, Roberto; Wieckowski, Marcin; Pham, Thang Tien; Jensen, Jesper Bevensee; Turkiewicz, Jarek; Siuzdak, Jerzy; Monroy, Idelfonso Tafur

    2011-12-19

    We experimentally demonstrate successful performance of VCSEL-based WDM link supporting advanced 16-level carrierless amplitude/phase modulation up to 1.25 Gbps, over 26 km SSMF with spectral efficiency of 4 bit/s/Hz for application in high capacity PONs.

  18. Un enfoque probabilístico en la autorreparación de redes G-PON

    Directory of Open Access Journals (Sweden)

    J. García-Algarra

    2014-01-01

    Full Text Available Resumen: El despliegue de accesos de fibra óptica hasta los hogares (Fiber To The Home, FTTH en adelante es una prioridad de los operadores de telecomunicación para soportar nuevos servicios digitales y mejorar la experiencia de los usuarios. G-PON es la tecnología más común; su instalación plantea importantes retos en el diagnóstico y reparación de averías de esta infraestructura, de características muy diferentes a las de los tradicionales pares de cobre. En este artículo presentamos una experiencia basada en un enfoque probabilístico del problema. Copyright © 2014 CEA. Publicado por Elsevier España, S.L. Todos los derechos reservados. Abstract: Fiber To The Home (FTTH rollout is a priority for telecom operators to provide fixed broadband new services and improve customer experience. G-PON is the most common technical choice that creates new challenges related to diagnosis and self healing. A probabilistic approach has been evaluated in a lab environment to overcome the uncertainties of this scenario, and results that is suitable for live network. Palabras clave: FTTH, G-PON, red bayesiana, agentes, autorreparación., Keywords: FTTH, G-PON, Bayesian Network, agents, self healing.

  19. Highly Effective Crosstalk Mitigation Method Using Counter-Propagation in Semiconductor Optical Amplifier for Remodulation WDM-PONs

    Directory of Open Access Journals (Sweden)

    Quang Thai Pham

    2014-01-01

    Full Text Available Remodulation-induced crosstalk mitigation in WDM-PON using remodulation approach is presented in this paper. Utilizing all-optical signal processing, the proposed method has been able to significantly improve system performance in terms of bit error rate (BER and bit rate distance product. Moreover, the proposed method could be used for both baseband and modulated downstream electrical signals.

  20. A biphasic compartmentation of neuro-transmission associated metabolic patterns during electro-induced axoplasmic transport in sheep medulla oblongata.

    Science.gov (United States)

    Narasimham, P V; Mohanachari, V; Swami, K S; Indira, K

    1983-01-01

    In the sheep medulla oblongata, on the induction of polarity by the applied voltage gradient of direct current along the length, the enzymes such as acetylcholinesterase and glutamate dehydrogenase showed anodal transport while the enzyme arginase showed cathodal transport indicating the possession of negative and positive charge densities on the enzymes. These studies indicated that the glutamate bound metabolism, one towards ammonia formation and the other towards the energy production and neural transmission, have opposed electro-characteristics. The acetylcholinesterase system had anodal characteristics coupled to the glutamate dehydrogenase patterns. The existence of two charge based compartmentation is envisaged in the neural tissue.

  1. Wavelength remodulation scheme using DPSK downstream and upstream for DWDM-PONs.

    Science.gov (United States)

    Deb, Nebras; Anis, Hanan

    2011-08-15

    We propose a novel wavelength-division-multiplexed passive optical network (WDM-PON) architecture with enhanced tolerance toward chromatic dispersion where a DPSK-modulated downstream signal with constant intensity is remodulated at the ONU side with a return to zero (RZ-DPSK). Driving the downstream modulator with a 50% RZ data enabled us to employ the pulse carver at the ONU for both removing downstream data and generating the optical RZ signal for upstream. This offers an attractive alternative to earlier proposed schemes as it allows us to use full modulation depth (FMD) and balanced detection for downstream data restoration. We experimentally demonstrate the system with both balanced and single-ended detection at 2.5 Gb/s. Error-free operation has been achieved along a 20 Km single mode fiber without dispersion compensation. © 2011 Optical Society of America

  2. MIMO-OFDM WDM PON with DM-VCSEL for femtocells application.

    Science.gov (United States)

    Othman, M B; Deng, Lei; Pang, Xiaodan; Caminos, J; Kozuch, W; Prince, K; Yu, Xianbin; Jensen, Jesper Bevensee; Monroy, I Tafur

    2011-12-12

    We report on experimental demonstration of 2x2 MIMO-OFDM 5.6-GHz radio over fiber signaling over 20 km WDM-PON with directly modulated (DM) VCSELs for femtocells application. MIMO-OFDM algorithms effectively compensate for impairments in the wireless link. Error-free signal demodulation of 64 subcarrier 4-QAM signals modulated at 198.5 Mb/s net data rate is achieved after fiber and 2 m indoor wireless transmission. We report BER of 7x10(-3) at the receiver for 16-QAM signals modulated at 397 Mb/s after 1 m of wireless transmission. Performance dependence on different wireless transmission path lengths, antenna separation, and number of subcarriers have been investigated. © 2011 Optical Society of America

  3. Application of advanced data collection and quality assurance methods in open prospective study - a case study of PONS project.

    Science.gov (United States)

    Wawrzyniak, Zbigniew M; Paczesny, Daniel; Mańczuk, Marta; Zatoński, Witold A

    2011-01-01

    Large-scale epidemiologic studies can assess health indicators differentiating social groups and important health outcomes of the incidence and mortality of cancer, cardiovascular disease, and others, to establish a solid knowledgebase for the prevention management of premature morbidity and mortality causes. This study presents new advanced methods of data collection and data management systems with current data quality control and security to ensure high quality data assessment of health indicators in the large epidemiologic PONS study (The Polish-Norwegian Study). The material for experiment is the data management design of the large-scale population study in Poland (PONS) and the managed processes are applied into establishing a high quality and solid knowledge. The functional requirements of the PONS study data collection, supported by the advanced IT web-based methods, resulted in medical data of a high quality, data security, with quality data assessment, control process and evolution monitoring are fulfilled and shared by the IT system. Data from disparate and deployed sources of information are integrated into databases via software interfaces, and archived by a multi task secure server. The practical and implemented solution of modern advanced database technologies and remote software/hardware structure successfully supports the research of the big PONS study project. Development and implementation of follow-up control of the consistency and quality of data analysis and the processes of the PONS sub-databases have excellent measurement properties of data consistency of more than 99%. The project itself, by tailored hardware/software application, shows the positive impact of Quality Assurance (QA) on the quality of outcomes analysis results, effective data management within a shorter time. This efficiency ensures the quality of the epidemiological data and indicators of health by the elimination of common errors of research questionnaires and medical

  4. All-optical virtual private network system in OFDM based long-reach PON using RSOA re-modulation technique

    Science.gov (United States)

    Kim, Chang-Hun; Jung, Sang-Min; Kang, Su-Min; Han, Sang-Kook

    2015-01-01

    We propose an all-optical virtual private network (VPN) system in an orthogonal frequency division multiplexing (OFDM) based long reach PON (LR-PON). In the optical access network field, technologies based on fundamental upstream (U/S) and downstream (D/S) have been actively researched to accommodate explosion of data capacity. However, data transmission among the end users which is arisen from cloud computing, file-sharing and interactive game takes a large weight inside of internet traffic. Moreover, this traffic is predicted to increase more if Internet of Things (IoT) services are activated. In a conventional PON, VPN data is transmitted through ONU-OLT-ONU via U/S and D/S carriers. It leads to waste of bandwidth and energy due to O-E-O conversion in the OLT and round-trip propagation between OLT and remote node (RN). Also, it causes inevitable load to the OLT for electrical buffer, scheduling and routing. The network inefficiency becomes more critical in a LR-PON which has been researched as an effort to reduce CAPEX and OPEX through metro-access consolidation. In the proposed system, the VPN data is separated from conventional U/S and re-modulated on the D/S carrier by using RSOA in the ONUs to avoid bandwidth consumption of U/S and D/S unlike in previously reported system. Moreover, the transmitted VPN data is re-directed to the ONUs by wavelength selective reflector device in the RN without passing through the OLT. Experimental demonstration for the VPN communication system in an OFDM based LR-PON has been verified.

  5. Investigation of PON1 activity and MDA levels in patients with epilepsy not receiving antiepileptic treatment

    Directory of Open Access Journals (Sweden)

    Dönmezdil N

    2016-04-01

    Full Text Available Nilüfer Dönmezdil, Mehmet Uğur Çevik, Hasan Hüseyin Özdemir, Muhterem Taşin Department of Neurology, Dicle University, Diyarbakır, Turkey Purpose: There are many studies dedicated to researching the etiopathogenesis of epilepsy. In such research, oxidative and antioxidant indicators of etiopathogenesis have also been examined under the scope. Drawing on a group of patients with epilepsy who were receiving no treatment, we have tried to evaluate whether or not an increase in oxidative indicators is linked directly with the disorder, independent of epileptic medicaments.Methods: Thirty people in good health and 30 newly diagnosed with epilepsy and who received ambulatory treatment in the polyclinic of the Neurology Department took part in the study. The tests relating to serum malondialdehyde (MDA levels and paraoxonase 1 (PON1 activity were carried out in the biochemistry laboratory.Results: Even though the levels of MDA in the patient group (14.34±3.59 nmol/mL were found to be high compared to those of the control group, which consisted of people in good health (13.53±3.56 nmol/mL, there was no statistically significant difference. PON1 activity in the serum taken from people in the patient group (0.65±0.17 was lower in comparison to that observed in the serum of the control group (0.71±0.17 U/L. Nonetheless, it was not so low as to have significance from a statistical point of view.Conclusion: We conclude that such a high level of oxidative parameters should have been related to the disease and that statistically significant findings that emerged in some other studies could have been related to an antiepileptic treatment. Keywords: epilepsy, paraoxonase 1, malondialdehyde, oxidative stress, epilepsy, biochemical marker

  6. PON-1 Activity and Plasma 8-Isoprostane Concentration in Patients with Angiographically Proven Coronary Artery Disease

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    Agnieszka Kuchta

    2016-01-01

    Full Text Available The aim of the study was to estimate association of the extent of angiographically proven coronary artery disease (CAD with plasma 8-isoprostane F2 (8-iso-PGF2α levels as a reliable marker of lipid peroxidation and serum activity of paraoxonase-1, which demonstrates the ability to protect against lipid oxidation. The study included 105 patients with angiographically documented CAD (CAD+ and 45 patients with negative results of coronary angiography (CAD−. Compared to the control group CAD+ patients were characterized by increased 8-iso-PGF2α levels (P=0.007 and reduced activity of PON-1 towards paraoxon (PONase, P=0.002 and phenyl acetate (AREase, P=0.037. Univariate correlation analysis indicated that 8-iso-PGF2α concentrations were positively associated with the severity of CAD as evaluated by the Gensini score (R=0.41, P<0.001 while PONase activity (R=−0.26, P<0.05 and AREase activity (R=−0.23, P<0.05 were inversely correlated with CAD severity. PONase activity and 8-iso-PGF2α concentration remained independent determinant of atherosclerosis severity in multiple linear regression after adjusting for age, gender, smoking habits, hypertension, type 2 diabetes, statin therapy, and HDL-C and TAG concentration (β coefficients −0.267; P<0.05 and 0.368; P<0.001, resp.. The results suggest that PON-1 activity and 8-iso-PGF2α concentration are associated with the presence and extent of coronary stenosis and may be considered additional markers of coronary artery disease.

  7. Wavelength Tuning Free Transceiver Module in OLT Downstream Multicasting 4λ × 10 Gb/s TWDM-PON System

    Directory of Open Access Journals (Sweden)

    M. S. Salleh

    2014-01-01

    Full Text Available We propose a new architecture of dynamic time-wavelength division multiplexing-passive optical network (TWDM-PON system that employs integrated all-optical packet routing (AOPR module using 4λ×10 Gbps downstream signal to support 20 km fiber transmission. This module has been designed to support high speed L2 aggregation and routing in the physical layer PON system by using multicasting cross-gain modulation (XGM to route packet from any PON port to multiple PON links. Meanwhile, the fixed wavelength optical line terminal (OLT transmitter with wavelength tuning free features has been designed to integrate with the semiconductor optical amplifier (SOA and passive arrayed waveguide grating (AWG. By implementing hybrid multicasting and multiplexing, the system has been able to support a PON system with full flexibility function for managing highly efficient dynamic bandwidth allocation to support the 4λ×10 Gb/s TWDM-PON system used to connect 4 different PON links using fixed wavelength OLT transceivers with maximum 38 dB link loss.

  8. Human Paraoxonase-1 Activity Is Related to the Number of CD4+ T-Cells and Is Restored by Antiretroviral Therapy in HIV-1-Infected Individuals

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    Luciana Morganti Ferreira Maselli

    2014-01-01

    Full Text Available Background. Paraoxonase-1 (PON1 activity is suggested to be altered in individuals infected with human immunodeficiency virus type-1 (HIV-1. We investigated PON1 activity in individuals receiving different regimens of highly active antiretroviral therapy (HAART. Methods. PON1 activity was evaluated in 91 HIV-1 seronegative and 624 HIV-1 infected individuals (115 were not undergoing therapy (ART-naïve, and 509 were receiving HAART. HIV-1 infected individuals were treated with the following: efavirenz (EFV; n=195 or nevirapine (NVP; n=95 or lopinavir/ritonavir (LOP/r; n=219. Serum levels of total cholesterol (TC, HDL, and low-density lipoprotein (LDL fractions and the atherogenic indices (AI, TC : HDL, and LDL : HDL ratios were determined. Results. PON1 activity (U/L was lower in the ART-naïve group compared with the other groups. PON1 activity correlated with CD4+ T-cell number of ART-naïve group (r=0,121; P=0,014. The LOP/r group showed a reduction in HDL and an increase in AI (TC : HDL ratio in comparison with other groups. Conclusion. PON1 activity was reduced in untreated individuals, but not in individuals receiving HAART. PON1 activity correlated with the number of CD4+ T-cells. The findings suggest that the activity of PON1 is associated with the immune status of HIV-1 infected individuals.

  9. Molecular Evolution of Human PON to Design Enhanced Catalytic Efficiency for Hydrolysis of Nerve Agents

    Science.gov (United States)

    2011-12-01

    transformed with the plasmid library were compartmentalized in water-in- oil emulsion droplets. The fluorogenic substrate was added, and the primary...Tawfik, D.S. Progress in evolution of catalytic bioscavengers for OP nerve agents: Towards a broad spectrum detoxifying variant, CBD S&T Conference...Nerve agent stereoisomers: analysis , isolation, and toxicology. Acc. Chem. Res. 21, 368-374 (1988). 6. Benschop, H.P., Konings, C.A.G., Van Genderen

  10. Prenatal pesticide exposure and PON1 genotype associated with adolescent body fat distribution evaluated by dual X-ray absorptiometry (DXA)

    DEFF Research Database (Denmark)

    Tinggaard, J; Wohlfahrt-Veje, C.; Husby, S.

    2016-01-01

    mass index or waist circumference were found. Prenatal pesticide exposure was associated with higher adolescent body fat content, including android fat deposition, independent of puberty. Girls appeared more susceptible than boys. Furthermore, the association depended on maternal and child PON1 Q192R...... affected by child PON1 Q192R genotype. We aimed to study whether prenatal pesticide exposure was still associated with body fat content and distribution in the children at puberty and the potential impact of both maternal and child PON1 Q192R genotype. In this prospective cohort study of 247 children born...

  11. [Hypoalgesia and hypothermesthesia in a lower extremity due to compression of the medulla oblongata by an elongated vertebral artery].

    Science.gov (United States)

    Iwasaki, Yasushi; Nakamura, Tomohiko; Hamada, Kensuke

    2004-03-01

    We describe the case of a 54-year-old man who presented with hypoalgesia and hypothermesthesia (pain and thermal numbness) in the left lower extremity. The patient first noticed a warm sensation in his left leg. By the time he first visited our neurological unit, the symptoms had been present for several weeks. His blood pressure was normal. Cranial nerve function and other neurological findings were normal except for hypoalgesia and hypothermesthesia in the left leg. Position and vibration senses were intact. Autonomic dysfunction was not found. Nerve conduction velocity and somatosensory evoked potentials were normal. Cranial MRI, MRA and 3D-CT showed an elongated and curved right vertebral artery that was normal in diameter but compressed to the lateral medullary zone. The artery was thought to compress the lateral spinothalamic tract. Cervical, thoracic and lumbo-sacral MRI findings were all normal. We believe that the patient's symptoms were provoked by the abnormal compression of the vertebral artery. The symptoms improved gradually within 2 month without operation therapy, but some hypoalgesia and hypothermesthesia are still present in the left leg. Although several reports have described compression of the medulla oblongata by a vertebral artery, to the best of our knowledge, there have been no reports of hypoalgesia and hypothermesthesia due to vascular compression of the medulla oblongata.

  12. Aire controls the differentiation program of thymic epithelial cells in the medulla for the establishment of self-tolerance

    Science.gov (United States)

    Yano, Masashi; Kuroda, Noriyuki; Han, Hongwei; Meguro-Horike, Makiko; Nishikawa, Yumiko; Kiyonari, Hiroshi; Maemura, Kentaro; Yanagawa, Yuchio; Obata, Kunihiko; Takahashi, Satoru; Ikawa, Tomokatsu; Satoh, Rumi; Kawamoto, Hiroshi; Mouri, Yasuhiro; Matsumoto, Mitsuru

    2008-01-01

    The roles of autoimmune regulator (Aire) in the expression of the diverse arrays of tissue-restricted antigen (TRA) genes from thymic epithelial cells in the medulla (medullary thymic epithelial cells [mTECs]) and in organization of the thymic microenvironment are enigmatic. We approached this issue by creating a mouse strain in which the coding sequence of green fluorescent protein (GFP) was inserted into the Aire locus in a manner allowing concomitant disruption of functional Aire protein expression. We found that Aire+ (i.e., GFP+) mTECs were the major cell types responsible for the expression of Aire-dependent TRA genes such as insulin 2 and salivary protein 1, whereas Aire-independent TRA genes such as C-reactive protein and glutamate decarboxylase 67 were expressed from both Aire+ and Aire− mTECs. Remarkably, absence of Aire from mTECs caused morphological changes together with altered distribution of mTECs committed to Aire expression. Furthermore, we found that the numbers of mTECs that express involucrin, a marker for terminal epidermal differentiation, were reduced in Aire-deficient mouse thymus, which was associated with nearly an absence of Hassall's corpuscle-like structures in the medulla. Our results suggest that Aire controls the differentiation program of mTECs, thereby organizing the global mTEC integrity that enables TRA expression from terminally differentiated mTECs in the thymic microenvironment. PMID:19015306

  13. Increased Levels of Human Carotid Lesion Linoleic Acid Hydroperoxide in Symptomatic and Asymptomatic Patients Is Inversely Correlated with Serum HDL and Paraoxonase 1 Activity

    Directory of Open Access Journals (Sweden)

    Elad Cohen

    2012-01-01

    Full Text Available Human carotid plaque components interact directly with circulating blood elements and thus they might affect each other. We determined plaque paraoxonase1 (PON1 hydrolytic-catalytic activity and compared plaque and blood levels of lipids, HDL, PON1, and HbA1c, as well as plaque-oxidized lipids in symptomatic and asymptomatic patients. Human carotid plaques were obtained from symptomatic and asymptomatic patients undergoing routine endarterectomy, and the lesions were ground and extracted for PON activity and lipid content determinations. Plaque PONs preserved paraoxonase, arylesterase, and lactonase activities. The PON1-specific inhibitor 2-hydroxyquinoline almost completely inhibited paraoxonase and lactonase activities, while only moderately inhibiting arylesterase activity. Oxysterol and triglyceride levels in plaques from symptomatic and asymptomatic patients did not differ significantly, but plaques from symptomatic patients had significantly higher (135% linoleic acid hydroperoxide (LA-13OOH levels. Their serum PON1 activity, cholesterol and triglyceride levels did not differ significantly, but symptomatic patients had significantly lower (28% serum HDL levels and higher (18% HbA1c levels. Thus LA-13OOH, a major atherogenic plaque element, showed significant negative correlations with serum PON1 activity and HDL levels, and a positive correlation with the prodiabetic atherogenic HbA1c. Plaque PON1 retains its activity and may decrease plaque atherogenicity by reducing specific oxidized lipids (e.g., LA-13OOH. The inverse correlation between plaque LA-13OOH level and serum HDL level and PON1 activity suggests a role for serum HDL and PON1 in LA-13OOH accumulation.

  14. Role of the medulla oblongata in normal and high arterial blood pressure regulation: the contribution of Escola Paulista de Medicina - UNIFESP.

    Science.gov (United States)

    Cravo, Sergio L; Campos, Ruy R; Colombari, Eduardo; Sato, Mônica A; Bergamaschi, Cássia M; Pedrino, Gustavo R; Ferreira-Neto, Marcos L; Lopes, Oswaldo U

    2009-09-01

    Several forms of experimental evidence gathered in the last 37 years have unequivocally established that the medulla oblongata harbors the main neural circuits responsible for generating the vasomotor tone and regulating arterial blood pressure. Our current understanding of this circuitry derives mainly from the studies of Pedro Guertzenstein, a former student who became Professor of Physiology at UNIFESP later, and his colleagues. In this review, we have summarized the main findings as well as our collaboration to a further understanding of the ventrolateral medulla and the control of arterial blood pressure under normal and pathological conditions.

  15. Hemorrhagic Onset of Hemangioblastoma Located in the Dorsal Medulla Oblongata Presenting with Tako-Tsubo Cardiomyopathy and Neurogenic Pulmonary Edema: A Case Report

    Directory of Open Access Journals (Sweden)

    Masayuki Gekka

    2014-03-01

    Full Text Available Here, we present a case of dorsal medulla oblongata hemangioblastoma with fourth ventricular hemorrhage. A 23-year-old female developed sudden consciousness disturbance, and CT revealed hemorrhage in all cerebral ventricles and a hyperdense mass in the cisterna magna. Although the reddish tumor located in the dorsal medulla oblongata was successfully removed, she suffered from severe tako-tsubo cardiomyopathy (TTC and neurogenic pulmonary edema (NPE because of baroreflex failure and damage to the solitary tract nuclei. After intensive care for 12 weeks following surgery, she was discharged without any neurological or radiological deficits. Pathogenesis of TTC/NPE is discussed in this paper.

  16. Power budget improvement of symmetric 40 Gb/s TWDM based PON2 system utilizing DMLs and DCF technique

    Science.gov (United States)

    Bindhaiq, Salem; Zulkifli, Nadiatulhuda; Supa'at, Abu Sahmah M.; Idrus, Sevia M.; Salleh, M. S.

    2018-01-01

    In this paper, we propose to use optical dispersion compensation based on the widely deployed compensating fiber (DCF) employing directly modulated lasers (DMLs) to improve the power budget in a symmetric 40 Gb/s time and wavelength division multiplexed-passive optical network (TWDM-PON) systems. The DML output waveforms in terms of output optical power, bandwidth enhancement factor (α) characteristics are investigated in order to minimize the effect of DML chirp and improve the transmission performance. Simulation results show dispersion compensation of up to 140 km of SMF with power budget of 56.6 dB and less than 2 dB dispersion penalty. The feasibility of bandwidth enhancement factor and power budget is also investigated. The simulation results indicate sufficient dispersion compensation for TWDM-PON based on DML transmission, which may vary considerably in their practical demonstration due to different system characterization.

  17. Serum Levels of Anti-PON1 and Anti-HDL Antibodies as Potential Biomarkers of Premature Atherosclerosis in Systemic Lupus Erythematosus.

    Science.gov (United States)

    López, Patricia; Rodríguez-Carrio, Javier; Martínez-Zapico, Aleida; Pérez-Álvarez, Ángel I; López-Mejías, Raquel; Benavente, Lorena; Mozo, Lourdes; Caminal-Montero, Luis; González-Gay, Miguel A; Suárez, Ana

    2017-11-01

    The present study aimed to evaluate the possible role of immunoglobulin G (IgG) antibodies against high-density lipoproteins (HDL) and paraoxonase 1 (PON1) as possible biomarkers of cardiovascular disease (CVD) in systemic lupus erythematosus (SLE). To this end, levels of these autoantibodies, PON1 activity and total antioxidant capacity were quantified in serum samples from 198 SLE patients, 100 healthy controls (HC) and 42 non-autoimmune individuals with traditional cardiovascular risk factors. PON1 rs662 polymorphism was analysed in a subgroup of patients and controls. Subclinical CVD were determined by Doppler ultrasound in 118 SLE patients and 30 HC, analysing carotid intima-media thickness (IMT) and blood flow parameters in internal carotid, middle cerebral and basilar arteries. Serum levels of both anti-HDL and anti-PON1 antibodies were increased in SLE patients compared with HC (p < 0.001); however, only anti-PON1 antibodies, in addition to disease activity, were significant predictors of the impaired PON1 function in SLE (β  = -0.143, p = 0.045). Conversely, anti-HDL antibodies were associated with higher risk of CVD (odds ratio: 3.69; p = 0.012) and lower HDL levels at disease onset (ρ = -0.324, p = 0.044). Finally, anti-PON1 antibodies were associated with carotid IMT in SLE (β = 0.201, p = 0.008) and inversely related to cranial arteries blood flow velocities in patients with clinical and subclinical CVD (all p < 0.001). In sum, these findings allowed us to propose serum levels of anti-PON1 and anti-HDL antibodies as potential early biomarkers of endothelial damage and premature atherosclerosis in SLE, thus constituting useful therapeutic targets for the prevention of future CVD in these patients. Schattauer GmbH Stuttgart.

  18. Interaction between prenatal pesticide exposure and a common polymorphism in the PON1 gene on DNA methylation in genes associated with cardio-metabolic disease risk

    DEFF Research Database (Denmark)

    Declerck, Ken; Remy, Sylvie; Wohlfahrt-Veje, Christine

    2017-01-01

    , the molecular mechanisms involved have not yet been resolved. It was hypothesized that epigenetics might be involved. The aim of the present study was therefore to investigate whether DNA methylation patterns in blood cells were related to prenatal pesticide exposure level, PON1 Q192R genotype, and associated......: DNA methylation may be an underlying mechanism explaining an adverse cardio-metabolic health profile in children carrying the PON1 192R-allele and prenatally exposed to pesticides....

  19. 2x2 MIMO-OFDM Gigabit fiber-wireless access system based on polarization division multiplexed WDM-PON

    DEFF Research Database (Denmark)

    Deng, Lei; Pang, Xiaodan; Zhao, Ying

    2012-01-01

    -based zero forcing (ZF) channel estimation algorithm is designed to compensate the polarization rotation and wireless multipath fading. A 797 Mb/s net data rate QPSK-OFDM signal with error free (OFDM signal with BER performance of 1.2 × 10......We propose a spectral efficient radio over wavelength division multiplexed passive optical network (WDM-PON) system by combining optical polarization division multiplexing (PDM) and wireless multiple input multiple output (MIMO) spatial multiplexing techniques. In our experiment, a training...

  20. Joint Effects of PON1 Polymorphisms and Vegetable Intake on Ischemic Stroke: A Family-Based Case Control Study

    Directory of Open Access Journals (Sweden)

    Juan Juan

    2017-12-01

    Full Text Available Paraoxonase 1 gene (PON1 polymorphisms and dietary vegetable and fruit intake are both established determinants of ischemic stroke (IS. However, little is known about whether these factors jointly influence the risk of IS. We analyzed the main effects of PON1, as well as the interactions between PON1 and dietary vegetable or fruit intake with the risk of total IS and its subtypes in a family-based case-control study conducted among 2158 Chinese participants (1007 IS cases and 1151 IS-free controls from 918 families. Conditional logistic regression models, with each family as a stratum, were used to examine the association between rs662 and IS. Gene-diet interactions were tested by including a cross-product term of dietary vegetable or fruit intake by rs662_G allele count in the models. Each copy of the PON1 rs662_G allele was associated with 28% higher risk of total IS (p = 0.008 and 32% higher risk of large artery atherosclerosis subtype (LAA (p = 0.01. We observed an interaction between rs662 and vegetable intake for both total IS (p = 0.006 and LAA (p = 0.02 after adjustment for covariates. Individuals who carry the rs662_A allele may benefit to a greater extent from intake of vegetables and thus be more effectively protected from ischemic stroke, whereas carriers of the G allele may still remain at greater risk for ischemic stroke due to their genetic backgrounds even when they consume a high level of vegetables. More studies are needed to replicate our findings among other populations.

  1. Mathematical Verification for Transmission Performance of Centralized Lightwave WDM-RoF-PON with Quintuple Services Integrated in Each Wavelength Channel

    Directory of Open Access Journals (Sweden)

    Shuai Chen

    2015-01-01

    Full Text Available Wavelength-division-multiplexing passive-optical-network (WDM-PON has been recognized as a promising solution of the “last mile” access as well as multibroadband data services access for end users, and WDM-RoF-PON, which employs radio-over-fiber (RoF technique in WDM-PON, is even a more attractive approach for future broadband fiber and wireless access for its strong availability of centralized multiservices transmission operation and its transparency for bandwidth and signal modulation formats. As for multiservices development in WDM-RoF-PON, various system designs have been reported and verified via simulation or experiment till now, and the scheme with multiservices transmitted in each single wavelength channel is believed as the one that has the highest bandwidth efficiency; however, the corresponding mathematical verification is still hard to be found in state-of-the-art literature. In this paper, system design and data transmission performance of a quintuple services integrated WDM-RoF-PON which jointly employs carrier multiplexing and orthogonal modulation techniques, have been theoretically analyzed and verified in detail; moreover, the system design has been duplicated and verified experimentally and the theory system of such WDM-RoF-PON scheme has thus been formed.

  2. Highly conformal and high-ionic conductivity thin-film electrolyte for 3D-structured micro batteries: Characterization of LiPON film deposited by MOCVD method

    Directory of Open Access Journals (Sweden)

    Takashi Fujibayashi

    2017-08-01

    Full Text Available This paper reports a lithium phosphorus oxynitride (LiPON thin-film electrolyte deposited using a metalorganic-chemical vapor deposition (MOCVD method for 3D-structured micro batteries. It is shown that the MOCVD-LiPON film has both highly-conformal step coverage on a patterned substrate with line/space=2μm/2μm and aspect ratio=1 (51±3 nm and high-ionic conductivity for very thin films deposited at 4.7 nm/min (5.9×10-6 S/cm for 190 nm and 5.3×10-6 S/cm for 95 nm. Detailed material characterization attributes the enhancement in ionic conductivity to a decrease in nanocrystallite size and improvement in chemical-composition uniformity in the film. In addition, electrochemical characterization of an all-solid-state thin-film battery fabricated with the 190 nm-thick LiPON film (Si substrate/Ti/Pt/LiCoO2/LiPON/a-Si:H/Cu demonstrates that the LiPON film can successfully act as the electrolyte for lithium-ion batteries. Therefore, the MOCVD-LiPON film is a promising candidate material to realize 3D-structured micro batteries in the near future.

  3. Simultaneous generation of wavelength division multiplexing PON and RoF signals using a hybrid mode-locked laser

    Science.gov (United States)

    Aldaya, Ivan; Campuzano, Gabriel; Castañón, Gerardo

    2015-06-01

    The use of millimeter-wave (mm-wave) frequencies has been proposed to overcome the imminent saturation of the ultra high frequency band, justifying research on radio over fiber (RoF) networks as an inexpensive and green solution to distribute multi-Gbps signals. Coincidently, telecommunication operators are investing a significant effort to deploy their passive optical network (PON) infrastructure closer to the users. In this work, we present a novel cost-efficient architecture based on a hybrid mode locked laser capable to simultaneously generate up-to 5 wavelength division multiplexing PON and RoF channels, being compatible with the 50-GHz ITU frequency grid. We analyze the limits of operation of our proposed architecture considering the high modal relative intensity noise induced by mode partition noise, as well as fiber impairments, such as chromatic dispersion and nonlinearities. The feasibility of generation and transmission of 5×10-Gbps PON and 5×5-Gbps RoF using orthogonal frequency division multiplexing up to 50 km has been demonstrated through realistic numerical simulations.

  4. Decreased platelet responsiveness to clopidogrel correlates with CYP2C19 and PON1 polymorphisms in atherosclerotic patients

    Directory of Open Access Journals (Sweden)

    J.F.M. Marchini

    Full Text Available Clopidogrel and aspirin are the most commonly used medications worldwide for dual antiplatelet therapy after percutaneous coronary intervention. However, clopidogrel hyporesponsiveness related to gene polymorphisms is a concern. Populations with higher degrees of genetic admixture may have increased prevalence of clopidogrel hyporesponsiveness. To assess this, we genotyped CYP2C19, ABCB1, and PON1 in 187 patients who underwent percutaneous coronary intervention. Race was self-defined by patients. We also performed light transmission aggregometry with adenosine diphosphate (ADP and arachidonic acid during dual antiplatelet therapy. We found a significant difference for presence of the CYP2C19*2 polymorphism between white and non-white patients. Although 7% of patients had platelet resistance to clopidogrel, this did not correlate with any of the tested genetic polymorphisms. We did not find platelet resistance to aspirin in this cohort. Multivariate analysis showed that patients with PON1 and CYP2C19 polymorphisms had higher light transmission after ADP aggregometry than patients with native alleles. There was no preponderance of any race in patients with higher light transmission aggregometry. In brief, PON1 and CYP2C19 polymorphisms were associated with lower clopidogrel responsiveness in this sample. Despite differences in CYP2C19 polymorphisms across white and non-white patients, genetic admixture by itself was not able to identify clopidogrel hyporesponsiveness.

  5. Direct and indirect pathways to lamina I in the medulla oblongata and spinal cord of the cat

    Science.gov (United States)

    Holstege, Gert

    1988-01-01

    The pathways to lamina I in the medulla oblongata and spinal cord of the cat were traced using horse-radish-peroxidase (HRP) and autoradiographic techniques. The HRP results indicated that several neuronal cell groups in the brain stem and hypothalamus project to the spinal cord throughout its total length. The autoradiographic tracing results demonstrated that the strongest projections to lamina I are derived from the following four areas: the caudal nucleus raphe magnus (NRM), the ventral part of the caudal pontine and NRM, the contralaterally projecting lateral pontine or paralemniscal tegmentum, and the paraventricular nucleus of the hypothalamus. In addition, a limited, especially at lumbosacral levels, distinct projection to lamina I was found to originate in the most caudal part of the medullary tegmentum.

  6. Effects of metabolites of the analgesic agent dipyrone (metamizol) on rostral ventromedial medulla cell activity in mice.

    Science.gov (United States)

    Maione, Sabatino; Radanova, Lilyana; De Gregorio, Danilo; Luongo, Livio; De Petrocellis, Luciano; Di Marzo, Vincenzo; Imming, Peter

    2015-02-05

    The molecular mechanism of action of dipyrone, a widely used antipyretic and non-opioid analgesic drug, is still not fully understood. Actions upon peripheral inflamed tissues as well as the central nervous system, especially upon the PAG-RVM axis, have been suggested. Dipyrone is a prodrug and its activity is due to its immediate conversion to its active metabolites. We tested the effect of two recently discovered metabolites of dipyrone, the arachidonoyl amides of 4-methylaminoantipyrine and 4-aminoantipyrine, on the neurons of the rostral ventromedial medulla (RVM), which are part of the descending pathway of antinociception. These compounds reduced the activity of ON-cells and increased the activity of OFF-cells. Both CB1 and TRPV1 blockade reversed these effects, suggesting that the endocannabinoid/endovanilloid system takes part in the analgesic effects of dipyrone. Copyright © 2015. Published by Elsevier B.V.

  7. Contrasting models for the roles of Aire in the differentiation program of epithelial cells in the thymic medulla.

    Science.gov (United States)

    Matsumoto, Mitsuru

    2011-01-01

    The current prevailing view regarding the role of Aire in self-tolerance is that it is involved in the transcriptional control of many tissue-restricted self-antigen genes in thymic epithelial cells in the medulla (mTECs); however, accumulating evidence also suggests that Aire has other roles, e.g. in mTEC differentiation, and furthermore that Aire can either promote or inhibit the mTEC differentiation program, i.e. Aire does not play a neutral role in mTEC differentiation. This review discusses when and how Aire plays an important role in controlling the organization of mTECs required for the expression of self-antigen genes. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  8. Provision of IR-UWB wireless and baseband wired services over a WDM-PON.

    Science.gov (United States)

    Pan, Shilong; Yao, Jianping

    2011-12-12

    A simple scheme to simultaneously generate an on-off keying or bi-phase modulation (BPM) impulse radio ultra wideband (IR-UWB) signal and a baseband wired signal in the optical domain using a dual-drive modulator is proposed and demonstrated. Although the two signals have spectral overlap in the optical spectrum, they are located at different frequency bands when converted to electrical signals at a photodetector (PD), which can be well separated by an electrical filter. An experiment is carried out. Eye diagrams, electrical spectra and BER measurements show that the co-channel interference between the UWB and the wired signals is small for a single-channel 36-km fiber link to provide 1.25-Gb/s UWB wireless and 1.25-Gb/s baseband wired services. The inter-channel interference is also small and negligible when the link is operated together with two other 1.25 Gb/s baseband wired links, which demonstrates that a conventional WDM-PON can be upgraded to provide additional UWB services without affecting the existing services by modifying the modulators in the center office and inserting UWB antennas in the optical network units. © 2011 Optical Society of America

  9. Research on Transmission Performance of Different Modulation Formats Based on Re-modulation WDM-PON

    Science.gov (United States)

    Li, Li; Feng, He

    2017-05-01

    Dispersion and nonlinear effects will increase the effect on the system when the optical information transmits in high speed and long distance. The new optical modulation technology can reduce the attenuation caused by transmission procedure. In this paper, OptiSystem and Matlab were combined to set a model by comparing the dispersion tolerance and nonlinear effect of different code modulation formats. After that, the better performance code of IRZ (Inverse Return-to-Zero) and DQPSK (Differential Quadrature Phase Shifted Keying) will be used to study their properties in 10Gbit/s re-modulation WDM-PON access model. The DQPSK was used in downlink, IRZ modulation was used in uplink adopts the IRZ modulation was used in 10 Gbit/s re-modulation WDM passive optical network access model uplink on the basis of the above method. A simulation analysis is also made between the different duty ratios of the DQPSK and IRZ. Compared with the NRZ type, the IRZ has a better anti-dispersion property, channel crosstalk suppression ability and higher spectrum efficiency although it costs 3 dB powers. At the same time, it simplifies the structure of the ONU on the premise of not increasing the power and the cost. So, it fits the large capacity requirements between user stations and the central office in the future.

  10. Improving performance of channel equalization in RSOA-based WDM-PON by QR decomposition.

    Science.gov (United States)

    Li, Xiang; Zhong, Wen-De; Alphones, Arokiaswami; Yu, Changyuan; Xu, Zhaowen

    2015-10-19

    In reflective semiconductor optical amplifier (RSOA)-based wavelength division multiplexed passive optical network (WDM-PON), the bit rate is limited by low modulation bandwidth of RSOAs. To overcome the limitation, we apply QR decomposition in channel equalizer (QR-CE) to achieve successive interference cancellation (SIC) for discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-S OFDM) signal. Using an RSOA with a 3-dB modulation bandwidth of only ~800 MHz, we experimentally demonstrate a 15.5-Gb/s over 20-km SSMF DFT-S OFDM transmission with QR-CE. The experimental results show that DFTS-OFDM with QR-CE attains much better BER performance than DFTS-OFDM and OFDM with conventional channel equalizers. The impacts of several parameters on QR-CE are investigated. It is found that 2 sub-bands in one OFDM symbol and 1 pilot in each sub-band are sufficient to achieve optimal performance and maintain the high spectral efficiency.

  11. Vitrification of in vitro matured oocytes collected from surplus ovarian medulla tissue resulting from fertility preservation of ovarian cortex tissue

    DEFF Research Database (Denmark)

    Yin, Huiqun; Jiang, Hong; Kristensen, Stine Gry

    2016-01-01

    PURPOSE: The aim of the study was to investigate the maturation rate of immature oocytes collected from ovarian medulla tissue normally discarded during preparation of ovarian cortical tissue for fertility preservation. Further we evaluated survival of derived MII oocytes following vitrification ...

  12. Noradrenaline concentration and turnover in nuclei of the hypothalamus and the medulla oblongata at two stages in the development of renal hypertension in the rat

    NARCIS (Netherlands)

    Wijnen, H.J.L.M.; Kloet, E.R. de; Versteeg, D.H.G.; Jong, Wybren de

    1980-01-01

    The noradrenaline concentration and the α-methyl-para-tyrosine (α-MPT)-induced disappearance of noradrenaline were determined in several nuclei of the hypothalamus and the medulla oblongata of renal hypertensive rats (two-kidney Goldblatt hypertension). A decreased α-MPT-induced disappearance of

  13. Neuronal localization of pituitary adenylate cyclase-activating polypeptide 38 in the adrenal medulla and growth-inhibitory effect on chromaffin cells

    DEFF Research Database (Denmark)

    Frödin, M; Hannibal, J; Wulff, B S

    1995-01-01

    medulla showed PACAP38 immunoreactivity in a widely distributed network of delicate nerve fibers surrounding the chromaffin cells. In a primary culture system, PACAP38 inhibited growth factor-stimulated DNA synthesis by 90% in neonatal and adult rat chromaffin cells with half-maximal inhibition at 4 and 0...

  14. Acute effects of L-tryptophan on tryptophan hydroxylation rate in brain regions (hypothalamus and medulla) of rainbow trout (Oncorhynchus mykiss).

    Science.gov (United States)

    Aldegunde, M; Soengas, J L; rozas, G

    2000-02-01

    Levels of 5-hydroxytryptophan (5-HTP) in brain regions (hypopthalamus and medulla) of rainbow trout were analysed by HPLC-EC 0, 10, 30, and 40 min after intraperitoneal administration of different doses of L-tryptophan (Trp) (0, 12.5, and 25 mg. kg(-1) body weight) in fish treated with 3-hydroxybenzylhydrazine (NSD1015; 75 mg. kg(-1)). The results show that, in control fish, 5-HTP levels in hypothalamus (58.03 +/- 6.36 pg. mg(-1) brain tissue) were significantly higher than those observed in medulla (28.04 +/- 4.32 pg. mg(-1) brain tissue). Basal tryptophan hydroxylation rates (after 0 mg. kg(-1) Trp administration) were 0.42 +/- 0.07 pg 5-HTP. mg(-1). min(-1), and 0.63 +/- 0.24 pg 5HTP. mg(-1). min(-1), for hypothalamus and medulla respectively. On the other hand, the results demonstrate that L-tryptophan administration induced significant increases in the rate of tryptophan hydroxylation, both in hypothalamus and medulla. These findings indicate that, in a way similar to that observed in mammals, brain tryptophan hydroxylase is unsaturated by its substrate (tryptophan) under normal physiological conditions. J. Exp. Zool. 286:131-135, 2000. Copyright 2000 Wiley-Liss, Inc.

  15. Development and psychometric properties of the parent version of the Profile of Neuropsychiatric Symptoms (PONS) in children and adolescents.

    Science.gov (United States)

    Santosh, Paramala; Gringras, Paul; Baird, Gillian; Fiori, Federico; Sala, Regina

    2015-05-19

    The use of neuropsychiatric Patient Centred Outcome Measures (PCOMs) in routine child mental health and paediatric services is very time consuming and often requires multiple scales being completed as no single scale covers all areas of psychopathology. The use of a web-based programme can overcome these problems and contribute to improved use of PCOMs in clinical practice. We aim to develop a web-based scale (using HealthTracker™) to screen and identify young people with significant neuropsychiatric symptoms to enable early intervention. Qualitative development of the Profile of Neuropsychiatric Symptoms (PONS) and quantitative evaluation of the psychometric properties of the PONS scale (parent version). Parents of 929 from the general population and 147 with neuropsychiatric disorders (5-18 years old) completed the PONS online. In addition, those children with neuropsychiatric disorders were assessed for the presence of current and lifetime psychiatric disorders using the Development and Well-Being Assessment (DAWBA). The PONS scale (parent version) consists of 30 symptom domains rated on a 7-point scale for both frequency and impairment. We found an intra-class correlation coefficient for single measures was 0.44 (0.42-0.46 95 % CI, F = 22.84, p ≤ 0.0001) and for average measures was 0.96 (0.95-0.96 95 % CI, F = 22.84, p ≤ 0.0001). The factor analysis showed a 4-factor model: Neurodevelopmental Disability; Behavioural and Emotional Dysregulation; Psychoses and Personality Dysfunction; and Anxiety and Depression. The receiver operating characteristic area for the 4-factors was 0.96 (SE = 0.006; 0.95-0.97 95 % CI). The PONS scale (parent version) is a web-based PCOM on the HealthTracker™ system that is a rapid, engaging measure that has excellent reliability and validity. The system allows for automated scoring and immediate feedback of statistical cut-off points and assists clinicians with diagnostic decision-making and optimises use

  16. Changes in orexinergic immunoreactivity of the piglet hypothalamus and pons after exposure to chronic postnatal nicotine and intermittent hypercapnic hypoxia.

    Science.gov (United States)

    Hunt, Nicholas J; Russell, Benjamin; Du, Man K; Waters, Karen A; Machaalani, Rita

    2016-06-01

    We recently showed that orexin expression in sudden infant death syndrome (SIDS) infants was reduced by 21% in the hypothalamus and by 40-50% in the pons as compared with controls. Orexin maintains wakefulness/sleeping states, arousal, and rapid eye movement sleep, abnormalities of which have been reported in SIDS. This study examined the effects of two prominent risk factors for SIDS, intermittent hypercapnic hypoxia (IHH) (prone-sleeping) and chronic nicotine exposure (cigarette-smoking), on orexin A (OxA) and orexin B (OxB) expression in piglets. Piglets were randomly assigned to five groups: saline control (n = 7), air control (n = 7), nicotine [2 mg/kg per day (14 days)] (n = 7), IHH (6 min of 7% O2 /8% CO2 alternating with 6-min periods of breathing air, for four cycles) (n = 7), and the combination of nicotine and IHH (N + IHH) (n = 7). OxA/OxB expression was quantified in the central tuberal hypothalamus [dorsal medial hypothalamus (DMH), perifornical area (PeF), and lateral hypothalamus], and the dorsal raphe, locus coeruleus of the pons. Nicotine and N + IHH exposures significantly increased: (i) orexin expression in the hypothalamus and pons; and (ii) the total number of neurons in the DMH and PeF. IHH decreased orexin expression in the hypothalamus and pons without changing neuronal numbers. Linear relationships existed between the percentage of orexin-positive neurons and the area of pontine orexin immunoreactivity of control and exposure piglets. These results demonstrate that postnatal nicotine exposure increases the proportion of orexin-positive neurons in the hypothalamus and fibre expression in the pons, and that IHH exposure does not prevent the nicotine-induced increase. Thus, although both nicotine and IHH are risk factors for SIDS, it appears they have opposing effects on OxA and OxB expression, with the IHH exposure closely mimicking what we recently found in SIDS. © 2016 Federation of European Neuroscience Societies and John

  17. Increased intrinsic brain connectivity between pons and somatosensory cortex during attacks of migraine with aura.

    Science.gov (United States)

    Hougaard, Anders; Amin, Faisal Mohammad; Larsson, Henrik B W; Rostrup, Egill; Ashina, Messoud

    2017-05-01

    The neurological disturbances of migraine aura are caused by transient cortical dysfunction due to waves of spreading depolarization that disrupt neuronal signaling. The effects of these cortical events on intrinsic brain connectivity during attacks of migraine aura have not previously been investigated. Studies of spontaneous migraine attacks are notoriously challenging due to their unpredictable nature and patient discomfort. We investigated 16 migraine patients with visual aura during attacks and in the attack-free state using resting state fMRI. We applied a hypothesis-driven seed-based approach focusing on cortical visual areas and areas involved in migraine pain, and a data-driven independent component analysis approach to detect changes in intrinsic brain signaling during attacks. In addition, we performed the analyses after mirroring the MRI data according to the side of perceived aura symptoms. We found a marked increase in connectivity during attacks between the left pons and the left primary somatosensory cortex including the head and face somatotopic areas (peak voxel: P = 0.0096, (x, y, z) = (-54, -32, 32), corresponding well with the majority of patients reporting right-sided pain. For aura-side normalized data, we found increased connectivity during attacks between visual area V5 and the lower middle frontal gyrus in the symptomatic hemisphere (peak voxel: P = 0.0194, (x, y, z) = (40, 40, 12). The present study provides evidence of altered intrinsic brain connectivity during attacks of migraine with aura, which may reflect consequences of cortical spreading depression, suggesting a link between aura and headache mechanisms. Hum Brain Mapp 38:2635-2642, 2017. © 2017 Wiley Periodicals, Inc. © 2017 Wiley Periodicals, Inc.

  18. Maternal and Fetal Genetic Associations of PTGER3 and PON1 with Preterm Birth

    Science.gov (United States)

    Ryckman, Kelli K.; Morken, Nils-Halvdan; White, Marquitta J.; Velez, Digna R.; Menon, Ramkumar; Fortunato, Stephen J.; Magnus, Per; Williams, Scott M.; Jacobsson, Bo

    2010-01-01

    Objective The purpose of this study was to identify associations between maternal and fetal genetic variants in candidate genes and spontaneous preterm birth (PTB) in a Norwegian population and to determine the effect size of those associations that corroborate a previous study of PTB. Methods DNA from 434 mother-baby dyads (214 cases and 220 controls) collected from the Norwegian Mother and Child Cohort (MoBa) was examined for association between 1,430 single nucleotide polymorphisms in 143 genes and PTB. These results were compared to a previous study on European Americans (EA) from Centennial Women's Hospital in Nashville, TN, USA. Odds ratios for SNPs that corroborated the Cenntennial study were determined on the combined MoBa and Centennial studies. Results In maternal samples the strongest results that corroborated the Centennial study were in the prostaglandin E receptor 3 gene (PTGER3; rs977214) (combined genotype p = 3×10−4). The best model for rs977214 was the AG/GG genotypes relative to the AA genotype and resulted in an OR of 0.55 (95% CI = 0.37–0.82, p = 0.003), indicating a protective effect. In fetal samples the most significant association in the combined data was rs854552 in the paraoxonase 1 gene (PON1) (combined allele p = 8×10−4). The best model was the TT genotype relative to the CC/CT genotypes, and resulted in an OR of 1.32 (95% CI = 1.13–1.53, p = 4×10−4). Conclusions These studies identify single locus associations with preterm birth for both maternal and fetal genotypes in two populations of European ancestry. PMID:20140262

  19. Maternal and fetal genetic associations of PTGER3 and PON1 with preterm birth.

    Directory of Open Access Journals (Sweden)

    Kelli K Ryckman

    2010-02-01

    Full Text Available The purpose of this study was to identify associations between maternal and fetal genetic variants in candidate genes and spontaneous preterm birth (PTB in a Norwegian population and to determine the effect size of those associations that corroborate a previous study of PTB.DNA from 434 mother-baby dyads (214 cases and 220 controls collected from the Norwegian Mother and Child Cohort (MoBa was examined for association between 1,430 single nucleotide polymorphisms in 143 genes and PTB. These results were compared to a previous study on European Americans (EA from Centennial Women's Hospital in Nashville, TN, USA. Odds ratios for SNPs that corroborated the Cenntennial study were determined on the combined MoBa and Centennial studies.In maternal samples the strongest results that corroborated the Centennial study were in the prostaglandin E receptor 3 gene (PTGER3; rs977214 (combined genotype p = 3x10(-4. The best model for rs977214 was the AG/GG genotypes relative to the AA genotype and resulted in an OR of 0.55 (95% CI = 0.37-0.82, p = 0.003, indicating a protective effect. In fetal samples the most significant association in the combined data was rs854552 in the paraoxonase 1 gene (PON1 (combined allele p = 8x10(-4. The best model was the TT genotype relative to the CC/CT genotypes, and resulted in an OR of 1.32 (95% CI = 1.13-1.53, p = 4x10(-4.These studies identify single locus associations with preterm birth for both maternal and fetal genotypes in two populations of European ancestry.

  20. A Symmetric RZ-DPSK Based Colorless NG-PON using Optical Carrier Suppression Scheme

    Directory of Open Access Journals (Sweden)

    AFTAB HUSSAIN

    2017-01-01

    Full Text Available In this paper a simultaneous transmission of a 10 Gbps RZ-DPSK data signal for downstream as well as for upstream is proposed and successfully simulated. An OCS (Optical Carrier Suppression scheme for generation of second order dual side-band optical carrier is utilized by quadrupling a 10 GHz clockfrequency with a 10 GHz LN-MZM (Lithium-Niobate Mach-Zehnder-Modulator. The upper side second order band is used to generate a RZ-DPSK (Return to Zero-Differential Phase Shift Keying data signal at the OLT (Optical Line Terminal. At the receiving ONU (Optical Network Unit 50 km away from the OLT the unmodulated lower side second order band coupled with the downlink transmitted signal is utilized for the uplink modulation of 10 Gbps data in RZ-DPSK format. The simulation results show that the performance of the single-tone RZ-DPSK data modulation format is a suitable choice for the WDMPON (Wavelength Division Multiplexing-Passive Optical Network link with a transmission span of 50 km. The proposed architecture eliminates the need of any pulse carver and mid-span power amplifiers along with the requirement of any power splitting device used in the ONU for colorless uplink transmission. In this scheme, high data rate transmission over long distance is achieved. This scheme merges the boundaries of local access networks and MAN (Metropolitan Area Networks. The proposed scheme is a highly robust, cost effective, backward compatible as well as future proof WDM-PON architecture.

  1. Can target-to-pons ratio be used as a reliable method for the analysis of [11C]PIB brain scans?

    Science.gov (United States)

    Edison, P; Hinz, R; Ramlackhansingh, A; Thomas, J; Gelosa, G; Archer, H A; Turkheimer, F E; Brooks, D J

    2012-04-15

    (11)C]PIB is the most widely used PET imaging marker for amyloid in dementia studies. In the majority of studies the cerebellum has been used as a reference region. However, cerebellar amyloid may be present in genetic Alzheimer's (AD), cerebral amyloid angiopathy and prion diseases. Therefore, we investigated whether the pons could be used as an alternative reference region for the analysis of [(11)C]PIB binding in AD. The aims of the study were to: 1) Evaluate the pons as a reference region using arterial plasma input function and Logan graphical analysis of binding. 2) Assess the power of target-to-pons ratios to discriminate controls from AD subjects. 3) Determine the test-retest reliability in AD subjects. 4) Demonstrate the application of target-to-pons ratio in subjects with elevated cerebellar [(11)C]PIB binding. 12 sporadic AD subjects aged 65 ± 4.5 yrs with a mean MMSE 21.4 ± 4 and 10 age-matched control subjects had [(11)C]PIB PET with arterial blood sampling. Three additional subjects (two subjects with pre-symptomatic presenilin-1 mutation carriers and one probable familial AD) were also studied. Object maps were created by segmenting individual MRIs and spatially transforming the gray matter images into standard stereotaxic MNI space and then superimposing a probabilistic atlas. Cortical [(11)C]PIB binding was assessed with an ROI (region of interest) analysis. Parametric maps of the volume of distribution (V(T)) were generated with Logan analysis. Additionally, parametric maps of the 60-90 min target-to-cerebellar ratio (RATIO(CER)) and the 60-90 min target-to-pons ratio (RATIO(PONS)) were computed. All three approaches were able to differentiate AD from controls (p0.83); RATIO(CER) performed best closely followed by RATIO(PONS). The two subjects with presenilin-1 mutations and the probable familial AD case showed no significant differences in cortical binding using RATIO(CER), but the RATIO(PONS) approach revealed higher [(11)C]PIB binding in

  2. On the influence of optical accuracy of the band-pass thin-film filter design for coexistence-type colorless WDM-PON

    Science.gov (United States)

    Korček, Dušan; Müllerová, Jarmila

    2010-12-01

    The future coexistence of Gigabit-capable passive optical networks (GPON) and wavelength division multiplexing PON (WDM-PON) requires the wavelength band separation of optical signals for GPON downstream (1480 - 1500 nm) and WDM-PON (1500 - 1620 nm). A new multi-layer thin-film structure of the band separation filter is proposed and numerically investigated to separate these spectral bands at the wavelength of 1500 nm with the spectral transmittance edge as steep as possible and at least of 32 dB insertion loss at 1500 nm. This article is focused on modeling transmission characteristics of the design of a GPON and WDM-PON band separation thin-film filter with the aim of detecting the impact of optical properties of materials involved, namely the number of the designed layers and material dispersion. Additionally, we report on the investigation of the influence of layer thickness deviations on the transmission characteristics of the band-pass filter aimed for separating GPON and WDM-PON wavelength regions.

  3. p.Q192R SNP of PON1 seems not to be Associated with Carotid Atherosclerosis Risk Factors in an Asymptomatic and Normolipidemic Brazilian Population Sample

    Directory of Open Access Journals (Sweden)

    Daniel Zanetti Scherrer

    2015-07-01

    Full Text Available Background:Evidences suggest that paraoxonase 1 (PON1 confers important antioxidant and anti-inflammatory properties when associated with high-density lipoprotein (HDL.Objective:To investigate the relationships between p.Q192R SNP of PON1, biochemical parameters and carotid atherosclerosis in an asymptomatic, normolipidemic Brazilian population sample.Methods:We studied 584 volunteers (females n = 326, males n = 258; 19-75 years of age. Total genomic DNA was extracted and SNP was detected in the TaqMan® SNP OpenArray® genotyping platform (Applied Biosystems, Foster City, CA. Plasma lipoproteins and apolipoproteins were determined and PON1 activity was measured using paraoxon as a substrate. High-resolution β-mode ultrasonography was used to measure cIMT and the presence of carotid atherosclerotic plaques in a subgroup of individuals (n = 317.Results:The presence of p.192Q was associated with a significant increase in PON1 activity (RR = 12.30 (11.38; RQ = 46.96 (22.35; QQ = 85.35 (24.83 μmol/min; p Conclusion:In low-risk individuals, the presence of the p.192Q variant of PON1 is associated with a beneficial plasma lipid profile but not with carotid atherosclerosis.

  4. The Escape of Sisyphus or What “Post NG-PON2” Should Do Apart from Neverending Capacity Upgrades

    Directory of Open Access Journals (Sweden)

    Martin Maier

    2014-03-01

    Full Text Available The primary design goal of (revolutionary NG-PON1&2 was the provisioning of an ever increasing capacity to cope with video-dominated traffic and handle the explosion of mobile data traffic by means of offloading. Recently, however, questions on the future of “post NG-PON2” have surfaced whether to shift its research focus to business and operation related aspects and move access technology into a substantially different direction than continued capacity upgrades. In fact, recent studies indicate that ultimately the major factor limiting the performance of 4G mobile networks is latency rather than capacity of the backhaul. In this paper, we review recently proposed low-latency techniques for NG-PONs that require architectural modifications at the remote node or distribution fiber level and highlight advanced network coding and real-time polling based low-latency techniques that can be implemented in software, enable NG-PONs to carry higher traffic loads and thereby extend their lifetime, and maintain the passive nature of existent optical distribution networks. Furthermore, we elaborate on emerging trends and open challenges for future post NG-PON2 research. To better understand their true potential, we put them into a wider non-technical and historical perspective leading up to a sustainable Third Industrial Revolution (TIR economy and its underlying Energy Internet.

  5. Adaptive upstream rate adjustment by RSOA-ONU depending on different injection power of seeding light in standard-reach and long-reach PON systems

    Science.gov (United States)

    Yeh, C. H.; Chow, C. W.; Shih, F. Y.; Pan, C. L.

    2012-08-01

    The wavelength division multiplexing-time division multiplexing (WDM-TDM) passive optical network (PON) using reflective semiconductor optical amplifier (RSOA)-based colorless optical networking units (ONUs) is considered as a promising candidate for the realization of fiber-to-the-home (FTTH). And this architecture is actively considered by Industrial Technology Research Institute (ITRI) for the realization of FTTH in Taiwan. However, different fiber distances and optical components would introduce different power budgets to different ONUs in the PON. Besides, due to the aging of optical transmitter (Tx), the power decay of the distributed optical carrier from the central office (CO) could also reduce the injection power into each ONU. The situation will be more severe in the long-reach (LR) PON, which is considered as an option for the future access. In this work, we investigate a WDM-TDM PON using RSOA-based ONU for upstream data rate adjustment depending on different continuous wave (CW) injection powers. Both standard-reach (25 km) and LR (100 km) transmissions are evaluated. Moreover, a detail analysis of the upstream signal bit-error rate (BER) performances at different injection powers, upstream data rates, PON split-ratios under stand-reach and long-reach is presented.

  6. Improved scheme for estimating T-CONT bandwidth demand in status reporting DBA for NG-PON

    Science.gov (United States)

    Skubic, Björn; Chen, Biao; Chen, Jiajia; Ahmed, Jawwad; Wosinska, Lena

    2009-11-01

    A scheme for estimating T-CONT bandwidth demand within dynamic bandwidth allocation (DBA) for next-generation passive optical network (NG-PON) is proposed and evaluated. Estimating T-CONT bandwidth demand is considered as a main challenge in gigabit-capable passive optical network (GPON) DBA. The proposed minimum guaranteed T-CONT content (MGTC) scheme allows for a more conservative estimate of bandwidth demand. It is shown that at high load significant improvements in delay, jitter and bandwidth utilization can be achieved with the proposed scheme. For light loads the conventional scheme shows better delay performance. However, this may be overcome by controlled overgranting in the MGTC scheme.

  7. Long reach DWDM-PON with 12.5 GHz channel spacing based on comb source seeding

    Science.gov (United States)

    Zhou, Zhao; Nie, Hai-tao; Wang, Yao-jun

    2016-07-01

    A long reach dense wavelength division multiplexing passive optical network (DWDM-PON) with 12.5 GHz channel spacing is proposed and experimentally demonstrated. An optical frequency comb source is used to provide the multiwavelength seeding light, while reflective semiconductor optical amplifiers (RSOAs) are installed in both optical line terminal (OLT) and optical network units (ONUs) as colorless transmitter. The experimental results show that the bidirectional transmission for 1.2 Gbit/s data rate is achieved over 80 km single mode fiber (SMF).

  8. Quantitative analysis of normal fetal medulla oblongata volume and flow by three-dimensional power Doppler ultrasound.

    Science.gov (United States)

    Shyu, Ing-Luen; Wang, Peng-Hui; Chen, Chih-Yao; Chen, Yi-Jen; Chang, Chia-Ming; Horng, Huann-Cheng; Yang, Ming-Jie; Yen, Ming-Shyen

    2016-06-01

    Assessment of the fetal medulla oblongata volume (MOV) and blood flow might be important in the evaluation of fetal brain growth. We used three-dimensional power Doppler ultrasound (3DPDUS) to assess the fetal MOV and blood flow index in normal gestation. The relationships between these parameters were further analyzed. We assessed the total volume and blood flow index of the fetal MO in normal pregnancies using a 3DPDUS (Voluson 730 Expert). The true sagittal plane over the fetal occipital area was measured by a 3D transabdominal probe to scan the fetal MO under the power Doppler mode. Then, we quantitatively assessed the total volume of the fetal MOV, mean gray area (MG), vascularization index (VI), and flow index (FI). A total of 106 fetuses, ranging from 19 weeks to 39 weeks of gestation, were involved in our study. The volume of the fetal MO was highly positively correlated with gestational age [correlation coefficient (r) = 0.686, p flow development quantitatively. Our study indicated that fetal MOV and blood flow correlated significantly with the advancement of gestational age. This information may serve as reference data for further studies of the fetal brain and blood flow under abnormal conditions. Copyright © 2016. Published by Elsevier B.V.

  9. Fractal analysis and Gray level co-occurrence matrix method for evaluation of reperfusion injury in kidney medulla.

    Science.gov (United States)

    Pantic, Igor; Nesic, Zorica; Paunovic Pantic, Jovana; Radojević-Škodrić, Sanja; Cetkovic, Mila; Basta Jovanovic, Gordana

    2016-05-21

    Fractal analysis and Gray level co-occurrence matrix method represent two novel mathematical algorithms commonly used in medical sciences as potential parts of computer-aided diagnostic systems. In this study, we tested the ability of these methods to discriminate the kidney medullar tissue suffering from reperfusion injury, from normal tissue. A total of 320 digital micrographs of Periodic acid-Schiff (PAS) - stained kidney medulla from 16 Wistar albino mice (20 per animal), were analyzed using National Institutes of Health ImageJ software (NIH, Bethesda, MD) and its plugins. 160 micrographs were obtained from the experimental group with induced reperfusion injury, and another 160 were obtained from the controls. For each micrograph we calculated the values of fractal dimension, lacunarity, as well as five GLCM features: angular second moment, entropy, inverse difference moment, GLCM contrast, and GLCM correlation. Discriminatory value of the parameters was tested using receiver operating characteristic (ROC) analysis, by measuring the area below ROC curve. The results indicate that certain features of GLCM algorithm have excellent discriminatory ability in evaluation of damaged kidney tissue. Fractal dimension and lacunarity as parameters of fractal analysis also had a relatively good discriminatory value in differentiation of injured from the normal tissue. Both methods have potentially promising application in future design of novel techniques applicable in cell physiology, histology and pathology. Copyright © 2016 Elsevier Ltd. All rights reserved.

  10. Selective C1 Lesioning Slightly Decreases Angiotensin II Type I Receptor Expression in the Rat Rostral Ventrolateral Medulla (RVLM).

    Science.gov (United States)

    Bourassa, Erick A; Stedenfeld, Kristen A; Sved, Alan F; Speth, Robert C

    2015-10-01

    Cardiovascular homeostasis is regulated in large part by the rostral ventrolateral medulla (RVLM) in mammals. Projections from the RVLM to the intermediolateral column of the thoracolumbar spinal cord innervate preganglionic neurons of the sympathetic nervous system causing elevation of blood pressure and heart rate. A large proportion, but not all, of the neurons in the RVLM contain the enzymes necessary for the production of epinephrine and are identified as the C1 cell group. Angiotensin II (Ang II) activates the RVLM acting upon AT1 receptors. To assess the proportion of AT1 receptors that are located on C1 neurons in the rat RVLM this study employed an antibody to dopamine-beta-hydroxylase conjugated to saporin, to selectively destroy C1 neurons in the RVLM. Expression of tyrosine hydroxylase immunoreactive neurons in the RVLM was reduced by 57 % in the toxin injected RVLM compared to the contralateral RVLM. In contrast, densitometric analysis of autoradiographic images of (125)I-sarcosine(1), isoleucine(8) Ang II binding to AT1 receptors of the injected side RVLM revealed a small (10 %) reduction in AT1-receptor expression compared to the contralateral RVLM. These results suggest that the majority of AT1 receptors in the rat RVLM are located on non-C1 neurons or glia.

  11. Mitigation of Rayleigh backscattering in 10-Gb/s downstream and 2.5-Gb/s upstream DWDM 100-km long-reach PONs.

    Science.gov (United States)

    Chow, C W; Yeh, C H

    2011-03-14

    Long-reach passive optical network (LR-PON) is considered as a promising technology towards higher capacity and extended coverage optical system. We propose and demonstrate a LR-PON with the capability of Rayleigh backscattering (RB) noise mitigation. By using the upstream signal wavelength-transition generated by a dual-parallel Mach-Zehnder modulator (DP-MZM) based colorless optical networking unit (ONU), the spectral overlap among the upstream signal and the RB noises can be minimized. Hence, due to the achievement of effective RB mitigation, a 100 km LR-PON with a high split-ratio of 512 is demonstrated using 10 Gb/s non-return-to-zero (NRZ) downstream and 2.5 Gb/s NRZ upstream signals. Detail analysis of the wavelength-transition generation is presented.

  12. OCDMA PON supporting ONU inter-networking based on gain-switched Fabry-Pérot lasers with external dual-wavelength injection.

    Science.gov (United States)

    Liu, Jie; Zeng, Duoduo; Guo, Changjian; Xu, Lei; He, Sailing

    2010-10-25

    We propose and demonstrate an OCDMA-PON scheme with optical network unit (ONU) internetworking capability, which utilizes low-cost gain-switched Fabry-Pérot (GS-FP) lasers with external dual-wavelength injection as the pulse sources on the ONU side. The injection-generated optical pulses in two wavelengths from the same GS-FP laser are used separately for the PON uplink transmission and ONU internetworking. Experimental results based on a two-user OCDMA system confirm the feasibility of the proposed scheme. With OCDMA technologies, separate ONU-internetworking groups can be established using different optical codes. We also give experiment results to analyze the performance of the ONU-ONU transmission at different power of interference signals when two ONU-internetworking groups are present in the OCDMA-PON.

  13. Human paraoxonase gene cluster overexpression alleviates angiotensin II-induced cardiac hypertrophy in mice.

    Science.gov (United States)

    Pei, Jian-Fei; Yan, Yun-Fei; Tang, Xiaoqiang; Zhang, Yang; Cui, Shen-Shen; Zhang, Zhu-Qin; Chen, Hou-Zao; Liu, De-Pei

    2016-11-01

    Cardiac hypertrophy is the strongest predictor of the development of heart failure, and anti-hypertrophic treatment holds the key to improving the clinical syndrome and increasing the survival rates for heart failure. The paraoxonase (PON) gene cluster (PC) protects against atherosclerosis and coronary artery diseases. However, the role of PC in the heart is largely unknown. To evaluate the roles of PC in cardiac hypertrophy, transgenic mice carrying the intact human PON1, PON2, and PON3 genes and their flanking sequences were studied. We demonstrated that the PC transgene (PC-Tg) protected mice from cardiac hypertrophy induced by Ang II; these mice had reduced heart weight/body weight ratios, decreased left ventricular wall thicknesses and increased fractional shortening compared with wild-type (WT) control. The same protective tendency was also observed with an Apoe -/- background. Mechanically, PC-Tg normalized the disequilibrium of matrix metalloproteinases (MMPs)/tissue inhibitors of MMPs (TIMPs) in hypertrophic hearts, which might contribute to the protective role of PC-Tg in cardiac fibrosis and, thus, protect against cardiac remodeling. Taken together, our results identify a novel anti-hypertrophic role for the PON gene cluster, suggesting a possible strategy for the treatment of cardiac hypertrophy through elevating the levels of the PON gene family.

  14. Paraoxonase 2 protein is spatially expressed in the human placenta and selectively reduced in labour.

    Science.gov (United States)

    Alwarfaly, Samy; Abdulsid, Akrem; Hanretty, Kevin; Lyall, Fiona

    2014-01-01

    Humans parturition involves interaction of hormonal, neurological, mechanical stretch and inflammatory pathways and the placenta plays a crucial role. The paraoxonases (PONs 1-3) protect against oxidative damage and lipid peroxidation, modulation of endoplasmic reticulum stress and regulation of apoptosis. Nothing is known about the role of PON2 in the placenta and labour. Since PON2 plays a role in oxidative stress and inflammation, both features of labour, we hypothesised that placental PON2 expression would alter during labour. PON2 was examined in placentas obtained from women who delivered by cesarean section and were not in labour and compared to the equivalent zone of placentas obtained from women who delivered vaginally following an uncomplicated labour. Samples were obtained from 12 sites within each placenta: 4 equally spaced apart pieces were sampled from the inner, middle and outer placental regions. PON2 expression was investigated by Western blotting and real time PCR. Two PON2 forms, one at 62 kDa and one at 43 kDa were found in all samples. No difference in protein expression of either isoform was found between the three sites in either the labour or non-labour group. At the middle site there was a highly significant decrease in PON2 expression in the labour group when compared to the non-labour group for both the 62 kDa form (p = 0.02) and the 43 kDa form (p = 0.006). No spatial differences were found within placentas at the mRNA level in either labour or non-labour. There was, paradoxically, an increase in PON2 mRNA in the labour group at the middle site only. This is the first report to describe changes in PON2 in the placenta in labour. The physiological and pathological significance of these remains to be elucidated but since PON2 is anti-inflammatory further studies are warranted to understand its role.

  15. PON1 L55M and Q192R gene polymorphisms and CAD risks in patients with hyperlipidemia : Clinical study of possible associations.

    Science.gov (United States)

    Chen, H; Ding, S; Zhou, M; Wu, X; Liu, X; Liu, J; Wu, Y; Liu, D

    2017-08-23

    A decreased plasma high density lipoprotein (HDL) cholesterol level is a strong risk factor for coronary artery disease (CAD). Antioxidant activity of HDL mainly lies in the activity of paraoxonase (PON). This study aimed to investigate the relationships between PON1 L55M and Q192R polymorphisms, and the risks of CAD in patients with hyperlipidemia. From January 2014 to January 2016, 244 patients were divided into hyperlipidemia, hyperlipidemia + CAD, and control groups. The hyperlipidemia and hyperlipidemia + CAD groups were designated as the case group. Serum PON1 concentrations were measured using the enzyme-linked immunosorbent assay. After isolating genomic DNA, the PON1 L55M and Q192R genes were amplified by polymerase chain reaction and sequenced. In the case group, the genotypes LM and LL were detected significantly more often than in the control group, as were the alleles R (33.33%, 42.12%) and L (22.78%, 29.11%). The frequency of QR and RR genotypes was significantly higher in the hyperlipidemia + CAD group than in the hyperlipidemia group; the allele R in the hyperlipidemia + CAD group (42.77%) was more frequent than in the hyperlipidemia group (23.78%). The Q192R polymorphism was associated with low serum PON1 concentrations, and the lowest concentration was observed in the 192QR + 192RR genotype (P = 0.03). Logistic regression analysis showed a significant correlation between the 192R allele and smoking (P = 0.03), body mass index (P = 0.02), systolic blood pressure (P = 0.004), total cholesterol (P = 0.03), triglycerides (P = 0.01), HDL (P = 0.004), and low density lipoprotein (P = 0.02). The PON1 alleles 192R and 55L are associated with CAD, and the Q192R polymorphism may be a risk factor for CAD.

  16. The paraoxonase 1 (PON1), platelet-activating factor acetylohydrolase (PAF-AH) and dimethylarginine dimethylaminohydrolase (DDAH) activity in the metformin treated normal and diabetic rats.

    Science.gov (United States)

    Wójcicka, Grażyna; Jamroz-Wiśniewska, Anna; Czechowska, Grażyna; Korolczuk, Agnieszka; Marciniak, Sebastian; Bełtowski, Jerzy

    2016-10-15

    Antidiabetic agents per se, apart from their glucose-lowering effect, can have an important impact on modifying the cardiovascular risk. The present study was undertaken to determine whether the known cardio-protective effects of metformin are linked to its potential ability to affect activities of HDL's paraoxonase (PON1) and platelet activating factor acetylohydrolase (PAF-AH) or via its interaction with the asymmetric dimethylarginine (ADMA)- dimethylarginine dimethylaminohydrolase (DDAH) axis. Normal and streptozotocin (STZ)-induced diabetic rats were treated with metformin (300mg/kg; 4 weeks). The activity of PON1, PAF-AH and DDAH were measured spectrophotometrically. The plasma ADMA level was determined by ELISA method. In STZ-induced diabetic rats the long-term administration of metformin normalized reduced PON1 activity assayed toward paraoxon (+42.5%, PPAF-AH activity in the plasma. Moreover, metformin increased DDAH activity in the renal cortex (+38.24%, P<0.01). Additionally metformin administration caused the increase in PON1 activity in the liver (+29.2%, P<0.01) accompanied by the reduction in the lipid peroxidation (-59.8%, P<0.001). Similarly, in non-diabetic treated rats the increase in liver PON1 activity was observed toward both paraoxon (+80.19%, P<0.001) and phenyl acetate (+29.3%, P<0.05), respectively. The present study has demonstrated that insulin-sensitizer metformin is important for preserving antioxidant HDL function in diabetes. Metformin might also exert its effect against diabetic complications by improving DDAH activity in the kidney and increasing PON1 activity in the liver. Copyright © 2016 Elsevier B.V. All rights reserved.

  17. Extrastriatal binding of [{sup 123}I]FP-CIT in the thalamus and pons: gender and age dependencies assessed in a European multicentre database of healthy controls

    Energy Technology Data Exchange (ETDEWEB)

    Koch, Walter; Unterrainer, Marcus; Xiong, Guoming; Bartenstein, Peter [University of Munich, Department of Nuclear Medicine, Munich (Germany); Diemling, Markus [Hermes Medical Solutions, Stockholm (Sweden); Varrone, Andrea [Karolinska University Hospital, Karolinska Institutet, Department of Clinical Neuroscience, Centre for Psychiatry Research, Stockholm (Sweden); Dickson, John C. [UCLH NHS Foundation Trust and University College, Institute of Nuclear Medicine, London (United Kingdom); Tossici-Bolt, Livia [University Hospitals Southampton NHS Trust, Department of Medical Physics, Southampton (United Kingdom); Sera, Terez [University of Szeged, Department of Nuclear Medicine and Euromedic Szeged, Szeged (Hungary); Asenbaum, Susanne [Medical University of Vienna, Department of Neurology, Vienna (Austria); Booij, Jan [University of Amsterdam, Department of Nuclear Medicine, Academic Medical Centre, Amsterdam (Netherlands); Kapucu, Ozlem L. [Gazi University, Department of Nuclear Medicine, Faculty of Medicine, Ankara (Turkey); Kluge, Andreas [ABX-CRO, Dresden (Germany); Ziebell, Morten [Rigshospitalet and University of Copenhagen, Neurobiology Research Unit, Copenhagen (Denmark); Darcourt, Jacques [University of Nice-Sophia Antipolis, Nuclear Medicine Department, Centre Antoine Lacassagne, Nice (France); Nobili, Flavio [University of Genoa, Clinical Neurology Unit, Department of Neuroscience (DINOGMI), Genoa (Italy); Pagani, Marco [CNR, Institute of Cognitive Sciences and Technologies, Rome (Italy); Karolinska Hospital, Department of Nuclear Medicine, Stockholm (Sweden); Hesse, Swen [University of Leipzig, Department of Nuclear Medicine, Leipzig (Germany); Leipzig University Medical Centre, Molecular Neuroimaging IFB Adiposity Diseases, Leipzig (Germany); Borght, Thierry Vander [Universite Catholique de Louvain, Nuclear Medicine Division, CHU Dinant Godinne, Yvoir (Belgium); Laere, Koen van [University Hospital and K.U. Leuven, Nuclear Medicine, Leuven (Belgium); Tatsch, Klaus [Staedtisches Klinikum Karlsruhe, Department of Nuclear Medicine, Karlsruhe (Germany); La Fougere, Christian [University of Munich, Department of Nuclear Medicine, Munich (Germany); University of Tuebingen, Department of Nuclear Medicine, Tuebingen (Germany)

    2014-10-15

    Apart from binding to the dopamine transporter (DAT), [{sup 123}I]FP-CIT shows moderate affinity for the serotonin transporter (SERT), allowing imaging of both monoamine transporters in a single imaging session in different brain areas. The aim of this study was to systematically evaluate extrastriatal binding (predominantly due to SERT) and its age and gender dependencies in a large cohort of healthy controls. SPECT data from 103 healthy controls with well-defined criteria of normality acquired at 13 different imaging centres were analysed for extrastriatal binding using volumes of interest analysis for the thalamus and the pons. Data were examined for gender and age effects as well as for potential influence of striatal DAT radiotracer binding. Thalamic binding was significantly higher than pons binding. Partial correlations showed an influence of putaminal DAT binding on measured binding in the thalamus but not on the pons. Data showed high interindividual variation in extrastriatal binding. Significant gender effects with 31 % higher binding in women than in men were observed in the thalamus, but not in the pons. An age dependency with a decline per decade (±standard error) of 8.2 ± 1.3 % for the thalamus and 6.8 ± 2.9 % for the pons was shown. The potential to evaluate extrastriatal predominant SERT binding in addition to the striatal DAT in a single imaging session was shown using a large database of [{sup 123}I]FP-CIT scans in healthy controls. For both the thalamus and the pons, an age-related decline in radiotracer binding was observed. Gender effects were demonstrated for binding in the thalamus only. As a potential clinical application, the data could be used as a reference to estimate SERT occupancy in addition to nigrostriatal integrity when using [{sup 123}I]FP-CIT for DAT imaging in patients treated with selective serotonin reuptake inhibitors. (orig.)

  18. Synchrotron nanoscopy imaging study of scalp hair in breast cancer patients and healthy individuals: Difference in medulla loss and cortical membrane enhancements.

    Science.gov (United States)

    Han, Sung-Mi; Chikawa, Jun-Ichi; Jeon, Jae-Kun; Hwang, Min-Young; Lim, Jun; Jeong, Young-Ju; Park, Sung-Hwan; Kim, Hong-Tae; Jheon, Sanghoon; Kim, Jong-Ki

    2016-01-01

    Nanoscopic synchrotron X-ray imaging was performed on scalp hair samples of patients with breast cancer and healthy individuals to investigate any structural differences as diagnostic tool. Hair strands were divided into 2-3 segments along the strands from root to tip, followed by imaging either in projection or in CT scanning with a monochromatic 6.78-keV X-ray using zone-plate optics with a resolving power of 60 nm. All the examined cancer hairs exhibited medulla loss with cancer stage-dependent pattern; complete loss, discontinuous or trace along the strands. In contrast, medullas were well retained without complete loss in the healthy hair. In the CT-scanned axial images, the cortical spindle compartments had no contrast in the healthy hair, but appeared hypointense in contrast to the surrounding hyperintense cortical membrane complex in the cancer hair. In conclusion, observation of medulla loss and cortical membrane enhancements in the hair strands of breast cancer patients demonstrated structural variations in the cancer hair, providing a new platform for further synchrotron X-ray imaging study of screening breast cancer patients. © 2015 Wiley Periodicals, Inc.

  19. Three-dimensional simulation of urine concentrating mechanism in a functional unit of rat outer medulla. I. Model structure and base case results.

    Science.gov (United States)

    Sohrabi, Salman; Saidi, Mohammad Said; Saadatmand, Maryam; Banazadeh, Mohamad Hossein; Firoozabadi, Bahar

    2014-12-01

    The urine formation and excretion system have long been of interest for mathematicians and physiologists to elucidate the obscurities within the process happens in renal tissue. In this study, a novel three-dimensional approach is utilized for modeling the urine concentrating mechanism in rat renal outer medulla which is essentially focused on demonstrating the significance of tubule's architecture revealed in anatomic studies and physiological literature. Since nephrons and vasculatures work interdependently through a highly structured arrangement in outer medulla which is dominated by vascular bundles, a detailed functional unit is proposed based on this specific configuration. Furthermore, due to relatively lesser influence of vasa recta on interstitial medullary osmolality and osmotic gradients as well as model structure simplicity, central core assumption is employed. The model equations are based on three spatial dimensional mass, momentum and species transport equations as well as standard expressions for solutes and water transmural transport. Our model can simulate preferential interactions between different tubules and it is shown that such interactions promote solute cycling and subsequently, enhance urine-concentrating capability. The numerical results are well consistent with tissue slice experiments and moreover, our model predicts more corticomedullary osmolality gradient in outer medulla than previous influential 1-D simulations. Copyright © 2014 Elsevier Inc. All rights reserved.

  20. Simulation and Comparison of Advanced Modulation Formats for Wavelength Reuse in High-SpeedWDM-PON System

    Energy Technology Data Exchange (ETDEWEB)

    Han Chenyang; Hong Wei, E-mail: younghan@live.cn [Room B209, Wuhan National Lab.for Optoelectronics, Huazhong University of Science and Technology, Loyu Road 1037, Wuhan, Hubei Province (China)

    2011-02-01

    In recent years, the innovation in devices and schemes of physical layer plays an important role in promoting the development of WDM-PON (Wavelength Division MultiplexingPassive Optical Network). Among the key technologies adopted in the WDM-PON system, advanced modulation formats at downstream and remodulations at upstream attract the most attention. DPSK (Differential Phase Shift Keying Modulation), FSK(Frequency-Shift Keying), IRZ(Inverted Return-to-Zero) and Manchester are four of the most common formats and each of them was studied before, but, however, nobody compared and analyzed them together.So, we will do the job by numeralsimulation in this paper. During our simulation, the 40-Gbit/s FSK is generated through the demodulation of two DPSK signals and 40-Gbit/s Manchester signal bases of employing a delay interferometer (DI) and an optical delay line as format conversion device to convert RZ-DPSK(Return to Zero-Differential Phase Shift Keying Modulation) coding to Manchester coding, both of the two format generation schemes are novel.Meanwhile,this paper emphasizes the input optical power and dispersion tolerance, which both related to the sensitivity of the system. Analyze the sensitivity with DPSK, FSK, IRZ and Manchester, and then compare the four advanced modulation formats.

  1. Practical 12.5-Gb/s, 12.5-GHz spaced ultra-dense WDM PON.

    Science.gov (United States)

    Shim, H K; Kim, Hoon; Chung, Y C

    2014-11-17

    We report a practical 12.5-Gb/s, 12.5-GHz-spaced ultra-dense wavelength-division-multiplexed passive optical network (UD-WDM PON). For the cost-effectiveness, we implement the downstream links by using electro-absorption modulated lasers (EMLs) in the 4-level pulse amplitude modulation (4PAM) format and PIN receivers, and the upstream links by using reflective semiconductor optical amplifiers (RSOAs) modulated in the quadrature phase-shift-keying (QPSK) format and low-cost self-homodyne receivers. To further enhance its cost-effectiveness, we also utilize an optical frequency comb generator, instead of a large number of wavelength-selected lasers, to provide the seed light for these colorless RSOAs. We optimize the operating conditions of the EMLs and RSOAs to maximize the power margins in the presence of the crosstalk arising from closely spaced neighboring channels and the inter-symbol interference (ISI) caused by the narrow passband of the cascaded arrayed-waveguide gratings (AWGs) as well as the limited modulation bandwidths of RSOAs. The experimental results show that we can secure the power margins of >2.5 dB for both upstream and downstream links of the proposed UD-WDM PON.

  2. Performance Analysis of a Hybrid Raman Optical Parametric Amplifier in the O- and E-Bands for CWDM PONs

    Directory of Open Access Journals (Sweden)

    Sasanthi Peiris

    2014-12-01

    Full Text Available We describe a hybrid Raman-optical parametric amplifier (HROPA operating at the O- and E-bands and designed for coarse wavelength division multiplexed (CWDM passive optical networks (PONs. We present the mathematical model and simulation results for the optimization of this HROPA design. Our analysis shows that separating the two amplification processes allows for optimization of each one separately, e.g., proper selection of pump optical powers and wavelengths to achieve maximum gain bandwidth and low gain ripple. Furthermore, we show that the proper design of optical filters incorporated in the HROPA architecture can suppress idlers generated during the OPA process, as well as other crosstalk that leaks through the passive optical components. The design approach enables error free performance for all nine wavelengths within the low half of the CWDM band, assigned to upstream traffic in a CWDM PON architecture, for all possible transmitter wavelength misalignments (±6 nm from the center wavelength of the channel band. We show that the HROPA can achieve error-free performance with a 170-nm gain bandwidth (e.g., 1264 nm–1436 nm, a gain of >20 dB and a gain ripple of <4 dB.

  3. Wired/wireless access integrated RoF-PON with scalable generation of multi-frequency MMWs enabled by polarization multiplexed FWM in SOA.

    Science.gov (United States)

    Xiang, Yu; Chen, Chen; Zhang, Chongfu; Qiu, Kun

    2013-01-14

    In this paper, we propose and demonstrate a novel integrated radio-over-fiber passive optical network (RoF-PON) system for both wired and wireless access. By utilizing the polarization multiplexed four-wave mixing (FWM) effect in a semiconductor optical amplifier (SOA), scalable generation of multi-frequency millimeter-waves (MMWs) can be provided so as to assist the configuration of multi-frequency wireless access for the wire/wireless access integrated ROF-PON system. In order to obtain a better performance, the polarization multiplexed FWM effect is investigated in detail. Simulation results successfully verify the feasibility of our proposed scheme.

  4. 18 F-FDG PET standard uptake values of the normal pons in children: establishing a reference value for diffuse intrinsic pontine glioma.

    Science.gov (United States)

    Jansen, Marc H A; Kloet, Reina W; van Vuurden, Dannis G; Veldhuijzen van Zanten, Sophie Em; Witte, Birgit I; Goldman, Serge; Vandertop, W Peter; Comans, Emile Fi; Hoekstra, Otto S; Boellaard, Ronald; Kaspers, Gert-Jan Jl

    2014-01-28

    Positron emission tomography (PET) scanning with [18 F]fluorodeoxyglucose (18 F-FDG) is a useful diagnostic and prediction tool in brain tumors, but its value in childhood diffuse intrinsic pontine glioma (DIPG) is still unclear. For interpretation of 18 F-FDG PET results in DIPG, uptake values of the normal pons of children of increasing ages are mandatory. The aim of this study was to determine 18 F-FDG standard uptake value ratios (SUVr) of the normal pons and to compare these to those of DIPG. We studied 36 subjects with a normal, non-affected pons (aged 5 to 23 years) and 6 patients with DIPG (aged 4 to 17 years) who underwent 18 F-FDG PET scanning. Magnetic resonance imaging (MRI) was co-registered to define the regions of interest. SUVr and SUVrmax for the pons/cerebellum (SUVrp/c) and the pons/occipital lobe (SUVrp/o) were calculated. Independent-samples t tests and Mann-Whitney U tests were used to compare the mean SUVr and Pearson's test for correlations. For the normal pons, mean SUVrp/c and SUVrp/o were 0.65 (±0.054) and 0.51 (±0.056), respectively. No significant correlations were found between the SUVr of the normal pons and sex, age, nor pontine volume. A modest but statistically significant correlation was found between SUVr and post-injection time acquisition timing. For DIPG, mean SUVrp/c and SUVrp/o were 0.74 (±0.20) and 0.65 (±0.30), respectively, while mean SUVrp(max)/c and SUVrp(max)/o were 1.95 (±0.48) and 1.81 (±0.20), respectively. The SUVr of the unaffected pons are strikingly constant between children, irrespective of sex and age, and can therefore be well used as a reference value for 18 F-FDG PET studies in DIPG.

  5. Demonstration of 10.7-Gb/s transmission in 50-km PON with uncooled free-running 1550-nm VCSEL

    DEFF Research Database (Denmark)

    Prince, Kamau; Ma, M.; Gibbon, Timothy Braidwood

    2010-01-01

    First-known demonstration of an uncooled, free-running 1550 nm VCSEL at 10.7 Gb/s over 50 km PON uplink with 35 km SMF and 15 km inverse dispersion fiber, achieving 24 dB margin for 10−9 BER.......First-known demonstration of an uncooled, free-running 1550 nm VCSEL at 10.7 Gb/s over 50 km PON uplink with 35 km SMF and 15 km inverse dispersion fiber, achieving 24 dB margin for 10−9 BER....

  6. 10 Gb/s 1550 nm VCSEL transmission over 23.6 km SMF with no Dispersion Compensation and no Injection Locking for WDM PONs

    DEFF Research Database (Denmark)

    Gibbon, Timothy Braidwood; Prince, Kamau; Neumeyer, Christian

    2010-01-01

    demonstrate 10Gb/s VCSEL transmission for WDM PON over 23.6km single mode fiber. Dispersion penalty is limited to 2.9dB by introducing a wavelength offset with respect to the remote array waveguide grating to reduce chirp.......demonstrate 10Gb/s VCSEL transmission for WDM PON over 23.6km single mode fiber. Dispersion penalty is limited to 2.9dB by introducing a wavelength offset with respect to the remote array waveguide grating to reduce chirp....

  7. Experimental Demonstration of 6-Mode Division Multiplexed NG-PON2: Cost Effective 40 Gbit/s/Spatial-Mode Access Based on 3D Laser Inscribed Photonic Lanterns

    DEFF Research Database (Denmark)

    Asif, Rameez; Hu, Hao; Mitchell, Paul

    We report the first space-division-multiplexed based symmetric NG-PON2 network by effi- ciently transmitting 40 Gbit/s/spatial-mode. Error free transmission (BER of 10−9 ) is obtained for all the downstream and upstream data tributaries over 1-km 6-spatial-mode FMF without using MIMO DSP......We report the first space-division-multiplexed based symmetric NG-PON2 network by effi- ciently transmitting 40 Gbit/s/spatial-mode. Error free transmission (BER of 10−9 ) is obtained for all the downstream and upstream data tributaries over 1-km 6-spatial-mode FMF without using MIMO DSP...

  8. A New Wavelength Optimization and Energy-Saving Scheme Based on Network Coding in Software-Defined WDM-PON Networks

    Science.gov (United States)

    Ren, Danping; Wu, Shanshan; Zhang, Lijing

    2016-09-01

    In view of the characteristics of the global control and flexible monitor of software-defined networks (SDN), we proposes a new optical access network architecture dedicated to Wavelength Division Multiplexing-Passive Optical Network (WDM-PON) systems based on SDN. The network coding (NC) technology is also applied into this architecture to enhance the utilization of wavelength resource and reduce the costs of light source. Simulation results show that this scheme can optimize the throughput of the WDM-PON network, greatly reduce the system time delay and energy consumption.

  9. Chronic infusion of lisinopril into hypothalamic paraventricular nucleus modulates cytokines and attenuates oxidative stress in rostral ventrolateral medulla in hypertension

    Energy Technology Data Exchange (ETDEWEB)

    Li, Hong-Bao [Department of Physiology and Pathophysiology, Xi' an Jiaotong University Cardiovascular Research Center, Xi' an Jiaotong University School of Medicine, Xi' an 710061 (China); Qin, Da-Nian, E-mail: dnqin@stu.edu.cn [Department of Physiology, Shantou University Medical College, Shantou 515041 (China); Ma, Le [Department of Public Health, Xi' an Jiaotong University School of Medicine, Xi' an 710061 (China); Miao, Yu-Wang [Department of Physiology and Pathophysiology, Xi' an Jiaotong University Cardiovascular Research Center, Xi' an Jiaotong University School of Medicine, Xi' an 710061 (China); Zhang, Dong-Mei [Department of Physiology, Dalian Medical University, Dalian 116044 (China); Lu, Yan [Department of Clinical Laboratory, Sanaitang Hospital, Lanzhou 730030 (China); Song, Xin-Ai [Department of Physiology and Pathophysiology, Xi' an Jiaotong University Cardiovascular Research Center, Xi' an Jiaotong University School of Medicine, Xi' an 710061 (China); Zhu, Guo-Qing [Key Laboratory of Cardiovascular Disease and Molecular Intervention, Department of Physiology, Nanjing Medical University, Nanjing 210029 (China); Kang, Yu-Ming, E-mail: ykang@mail.xjtu.edu.cn [Department of Physiology and Pathophysiology, Xi' an Jiaotong University Cardiovascular Research Center, Xi' an Jiaotong University School of Medicine, Xi' an 710061 (China)

    2014-09-01

    The hypothalamic paraventricular nucleus (PVN) and rostral ventrolateral medulla (RVLM) play a critical role in the generation and maintenance of sympathetic nerve activity. The renin–angiotensin system (RAS) in the brain is involved in the pathogenesis of hypertension. This study was designed to determine whether inhibition of the angiotensin-converting enzyme (ACE) in the PVN modulates cytokines and attenuates oxidative stress (ROS) in the RVLM, and decreases the blood pressure and sympathetic activity in renovascular hypertensive rats. Renovascular hypertension was induced in male Sprague–Dawley rats by the two-kidney one-clip (2K1C) method. Renovascular hypertensive rats received bilateral PVN infusion with ACE inhibitor lisinopril (LSP, 10 μg/h) or vehicle via osmotic minipump for 4 weeks. Mean arterial pressure (MAP), renal sympathetic nerve activity (RSNA), and plasma proinflammatory cytokines (PICs) were significantly increased in renovascular hypertensive rats. The renovascular hypertensive rats also had higher levels of ACE in the PVN, and lower level of interleukin-10 (IL-10) in the RVLM. In addition, the levels of PICs, the chemokine MCP-1, the subunit of NAD(P)H oxidase (gp91{sup phox}) and ROS in the RVLM were increased in hypertensive rats. PVN treatment with LSP attenuated those changes occurring in renovascular hypertensive rats. Our findings suggest that the beneficial effects of ACE inhibition in the PVN in renovascular hypertension are partly due to modulation cytokines and attenuation oxidative stress in the RVLM. - Highlights: • Chronic ACE inhibition in PVN on renovascular hypertension was investigated. • 2K1C resulted in sympathoexcitation, increased plasma PICs and hypertension. • 2K1C rats had higher levels of cytokines and reactive oxygen species (ROS) in RVLM. • Chronic inhibiting PVN ACE attenuates cytokines and ROS in RVLM in hypertension.

  10. Glycine is used as a transmitter by decrementing expiratory neurons of the ventrolateral medulla in the rat.

    Science.gov (United States)

    Ezure, Kazuhisa; Tanaka, Ikuko; Kondo, Masahiro

    2003-10-01

    The medullary respiratory network involves various types of respiratory neurons. The present study focused on possible inhibitory neurons called decrementing expiratory (E-DEC) neurons and aimed to determine whether their transmitter is glycine or GABA. In Nembutal-anesthetized, neuromuscularly blocked, and artificially ventilated rats we labeled E-DEC neurons with Neurobiotin and processed the tissues for detection of mRNA encoding either glycine transporter 2 (GLYT2) as a marker for glycinergic neurons or glutamic acid decarboxylase isoform 67 (GAD67) as a marker for GABAergic neurons, using in situ hybridization. Of 38 E-DEC neurons that were labeled, cranial motoneurons (n = 14), which were labeled as control, were negative for either GLYT2 mRNA (n = 10) or GAD67 mRNA (n = 4). The other E-DEC neurons (n = 24) were non-motoneurons. Sixteen of them were examined for GLYT2 mRNA, and the majority (11 of 16) was GLYT2 mRNA-positive. The remaining E-DEC neurons (n = 8) were examined for GAD67 mRNA, and all of them were GAD67 mRNA-negative. The GLYT2 mRNA-positive E-DEC neurons were located in the ventrolateral medulla spanning the Bötzinger complex (BOT), the rostral ventral respiratory group (VRG), and the caudal VRG. We conclude that not only E-DEC neurons of the BOT but also many E-DEC neurons of the VRG are inhibitory and use glycine as a transmitter. Although the present negative data cannot rule out completely the release of GABA or co-release of glycine and GABA from E-DEC neurons, several lines of evidence suggest that the glycinergic process is primarily responsible for the phasic inhibition of the respiratory network during the expiratory phase.

  11. NAAG peptidase inhibition in the periaqueductal gray and rostral ventromedial medulla reduces flinching in the formalin model of inflammation

    Directory of Open Access Journals (Sweden)

    Yamada Toshihiko

    2012-09-01

    Full Text Available Abstract Background Metabotropic glutamate receptors (mGluRs have been identified as significant analgesic targets. Systemic treatments with inhibitors of the enzymes that inactivate the peptide transmitter N-acetylaspartylglutamate (NAAG, an mGluR3 agonist, have an analgesia-like effect in rat models of inflammatory and neuropathic pain. The goal of this study was to begin defining locations within the central pain pathway at which NAAG activation of its receptor mediates this effect. Results NAAG immunoreactivity was found in neurons in two brain regions that mediate nociceptive processing, the periaqueductal gray (PAG and the rostral ventromedial medulla (RVM. Microinjection of the NAAG peptidase inhibitor ZJ43 into the PAG contralateral, but not ipsilateral, to the formalin injected footpad reduced the rapid and slow phases of the nociceptive response in a dose-dependent manner. ZJ43 injected into the RVM also reduced the rapid and slow phase of the response. The group II mGluR antagonist LY341495 blocked these effects of ZJ43 on the PAG and RVM. NAAG peptidase inhibition in the PAG and RVM did not affect the thermal withdrawal response in the hot plate test. Footpad inflammation also induced a significant increase in glutamate release in the PAG. Systemic injection of ZJ43 increased NAAG levels in the PAG and RVM and blocked the inflammation-induced increase in glutamate release in the PAG. Conclusion These data demonstrate a behavioral and neurochemical role for NAAG in the PAG and RVM in regulating the spinal motor response to inflammation and that NAAG peptidase inhibition has potential as an approach to treating inflammatory pain via either the ascending (PAG and/or the descending pain pathways (PAG and RVM that warrants further study.

  12. Responses of neurons in the rostral ventrolateral medulla to whole body rotations: comparisons in decerebrate and conscious cats.

    Science.gov (United States)

    Destefino, V J; Reighard, D A; Sugiyama, Y; Suzuki, T; Cotter, L A; Larson, M G; Gandhi, N J; Barman, S M; Yates, B J

    2011-06-01

    The responses to vestibular stimulation of brain stem neurons that regulate sympathetic outflow and blood flow have been studied extensively in decerebrate preparations, but not in conscious animals. In the present study, we compared the responses of neurons in the rostral ventrolateral medulla (RVLM), a principal region of the brain stem involved in the regulation of blood pressure, to whole body rotations of conscious and decerebrate cats. In both preparations, RVLM neurons exhibited similar levels of spontaneous activity (median of ∼17 spikes/s). The firing of about half of the RVLM neurons recorded in decerebrate cats was modulated by rotations; these cells were activated by vertical tilts in a variety of directions, with response characteristics suggesting that their labyrinthine inputs originated in otolith organs. The activity of over one-third of RVLM neurons in decerebrate animals was altered by stimulation of baroreceptors; RVLM units with and without baroreceptor signals had similar responses to rotations. In contrast, only 6% of RVLM neurons studied in conscious cats exhibited cardiac-related activity, and the firing of just 1% of the cells was modulated by rotations. These data suggest that the brain stem circuitry mediating vestibulosympathetic reflexes is highly sensitive to changes in body position in space but that the responses to vestibular stimuli of neurons in the pathway are suppressed by higher brain centers in conscious animals. The findings also raise the possibility that autonomic responses to a variety of inputs, including those from the inner ear, could be gated according to behavioral context and attenuated when they are not necessary.

  13. Unilateral microdialysis of gabazine in the dorsal medulla reverses thermal prolongation of the laryngeal chemoreflex in decerebrate piglets.

    Science.gov (United States)

    Xia, Luxi; Damon, Tracey; Niblock, Mary M; Bartlett, Donald; Leiter, J C

    2007-11-01

    The laryngeal chemoreflex (LCR) is elicited by water in the larynx and leads to apnea and respiratory disruption in immature animals. The LCR is exaggerated by the elevation of brain temperature within or near the nucleus of the solitary tract (NTS) in decerebrate piglets. Thermal prolongation of reflex apnea elicited by superior laryngeal nerve stimulation is reduced by systemic administration of GABA(A) receptor antagonists. Therefore, we tested the hypothesis that microdialysis within or near the NTS of gabazine, a GABA(A) receptor antagonist, would reverse thermal prolongation of the LCR. We examined this hypothesis in 21 decerebrate piglets (age 3-13 days). We elicited the LCR by injecting 0.1 ml of water into the larynx before and after each piglet's body temperature was elevated by approximately 2.5 degrees C and before and after 2-5 mM gabazine was dialyzed unilaterally and focally in the medulla. Elevated body temperature failed to prolong the LCR in one piglet, which was excluded from analysis. Elevated body temperature prolonged the LCR in all the remaining animals, and dialysis of gabazine into the region near the NTS (n = 10) reversed the thermal prolongation of the LCR even though body temperature remained elevated. Dialysis of gabazine in other medullary sites (n = 10) did not reverse thermal prolongation of the LCR. Gabazine had no consistent effect on baseline respiratory activity during hyperthermia. These findings are consistent with the hypothesis that hyperthermia activates GABAergic mechanisms in or near the NTS that are necessary for the thermal prolongation of the LCR.

  14. Redox-sensitive endoplasmic reticulum stress and autophagy at rostral ventrolateral medulla contribute to hypertension in spontaneously hypertensive rats.

    Science.gov (United States)

    Chao, Yung-Mei; Lai, Ming-Derg; Chan, Julie Y H

    2013-06-01

    Perturbations of proper functions of the endoplasmic reticulum (ER) cause accumulation of misfolded or unfolded proteins in the cell, creating a condition known as ER stress. Prolonged ER stress has been implicated in hypertension. Oxidative stress in the rostral ventrolateral medulla (RVLM), where sympathetic premotor neurons for the maintenance of vasomotor tone reside, plays a pivotal role in neurogenic hypertension. This study aimed to evaluate the contribution of ER stress in RVLM to oxidative stress-associated hypertension and delineate the underlying molecular mechanisms. The expression of glucose-regulated protein 78 kDa and the phosphorylation of protein kinase RNA-like ER kinase-translation initiation factor α, 2 major protein markers of ER stress, were augmented in RVLM and preceded the development of hypertensive phenotype in spontaneously hypertensive rats. In RVLM of spontaneously hypertensive rats, stabilizing ER stress by salubrinal promoted antihypertension, and scavenging the reactive oxygen species by tempol reduced the augmented ER stress. Furthermore, induction of oxidative stress by angiotensin II induced ER stress in RVLM, and induction of ER stress by tunicamycin in RVLM induced pressor response in normotensive Wistar-Kyoto rats. Autophagy, as reflected by the expression of lysosome-associated membrane protein-2 and microtubule-associated protein 1 light chain 3-II (LC3-II), was significantly increased in RVLM of spontaneously hypertensive rats and was abrogated by salubrinal. In addition, inhibition of autophagy or silencing LC3-II gene in RVLM resulted in antihypertension in spontaneously hypertensive rats. These results suggest that redox-sensitive induction of ER stress and activation of autophagy in RVLM contribute to oxidative stress-associated neurogenic hypertension.

  15. Ectopic Aire Expression in the Thymic Cortex Reveals Inherent Properties of Aire as a Tolerogenic Factor within the Medulla.

    Science.gov (United States)

    Nishijima, Hitoshi; Kitano, Satsuki; Miyachi, Hitoshi; Morimoto, Junko; Kawano, Hiroshi; Hirota, Fumiko; Morita, Ryoko; Mouri, Yasuhiro; Masuda, Kiyoshi; Imoto, Issei; Ikuta, Koichi; Matsumoto, Mitsuru

    2015-11-15

    Cortical thymic epithelial cells (cTECs) and medullary thymic epithelial cells (mTECs) play essential roles in the positive and negative selection of developing thymocytes, respectively. Aire in mTECs plays an essential role in the latter process through expression of broad arrays of tissue-restricted Ags. To determine whether the location of Aire within the medulla is absolutely essential or whether Aire could also function within the cortex for establishment of self-tolerance, we used bacterial artificial chromosome technology to establish a semiknockin strain of NOD-background (β5t/Aire-transgenic) mice expressing Aire under control of the promoter of β5t, a thymoproteasome expressed exclusively in the cortex. Although Aire was expressed in cTECs as typical nuclear dot protein in β5t/Aire-Tg mice, cTECs expressing Aire ectopically did not confer transcriptional expression of either Aire-dependent or Aire-independent tissue-restricted Ag genes. We then crossed β5t/Aire-Tg mice with Aire-deficient NOD mice, generating a strain in which Aire expression was confined to cTECs. Despite the presence of Aire(+) cTECs, these mice succumbed to autoimmunity, as did Aire-deficient NOD mice. The thymic microenvironment harboring Aire(+) cTECs, within which many Aire-activated genes were present, also showed no obvious alteration of positive selection, suggesting that Aire's unique property of generating a self-tolerant T cell repertoire is functional only in mTECs. Copyright © 2015 by The American Association of Immunologists, Inc.

  16. Urine concentrating mechanism in the inner medulla of the mammalian kidney: role of three-dimensional architecture

    Science.gov (United States)

    Dantzler, W. H.; Pannabecker, T. L.; Layton, A. T.; Layton, H. E.

    2013-01-01

    The urine concentrating mechanism in the mammalian renal inner medulla (IM) is not understood, although it is generally considered to involve countercurrent flows in tubules and blood vessels. A possible role for the three-dimensional relationships of these tubules and vessels in the concentrating process is suggested by recent reconstructions from serial sections labelled with antibodies to tubular and vascular proteins and mathematical models based on these studies. The reconstructions revealed that the lower 60% of each descending thin limb (DTL) of Henle’s loops lacks water channels (aquaporin-1) and osmotic water permeability and ascending thin limbs (ATLs) begin with a prebend segment of constant length. In the outer zone of the IM (i) clusters of coalescing collecting ducts (CDs) form organizing motif for loops of Henle and vasa recta; (ii) DTLs and descending vasa recta (DVR) are arrayed outside CD clusters, whereas ATLs and ascending vasa recta (AVR) are uniformly distributed inside and outside clusters; (iii) within CD clusters, interstitial nodal spaces are formed by a CD on one side, AVR on two sides, and an ATL on the fourth side. These spaces may function as mixing chambers for urea from CDs and NaCl from ATLs. In the inner zone of the IM, cluster organization disappears and half of Henle’s loops have broad lateral bends wrapped around terminal CDs. Mathematical models based on these findings and involving solute mixing in the interstitial spaces can produce urine slightly more concentrated than that of a moderately antidiuretic rat but no higher. PMID:21054810

  17. "On-" and "off-" cells in the rostral ventromedial medulla of rats held in thermoneutral conditions: are they involved in thermoregulation?

    Science.gov (United States)

    El Bitar, Nabil; Pollin, Bernard; Le Bars, Daniel

    2014-11-01

    In thermal neutral condition, rats display cyclic variations of the vasomotion of the tail and paws, synchronized with fluctuations of blood pressure, heart rate, and core body temperature. "On-" and "off-" cells located in the rostral ventromedial medulla, a cerebral structure implicated in somatic sympathetic drive, 1) exhibit similar spontaneous cyclic activities in antiphase and 2) are activated and inhibited by thermal nociceptive stimuli, respectively. We aimed at evaluating the implication of such neurons in autonomic regulation by establishing correlations between their firing and blood pressure, heart rate, and skin and core body temperature variations. When, during a cycle, a relative high core body temperature was reached, the on-cells were activated and within half a minute, the off-cells and blood pressure were depressed, followed by heart rate depression within a further minute; vasodilatation of the tail followed invariably within ∼3 min, often completed with vasodilatation of hind paws. The outcome was an increased heat loss that lessened the core body temperature. When the decrease of core body temperature achieved a few tenths of degrees, sympathetic activation switches off and converse variations occurred, providing cycles of three to seven periods/h. On- and off-cell activities were correlated with inhibition and activation of the sympathetic system, respectively. The temporal sequence of events was as follows: core body temperature → on-cell → off-cell ∼ blood pressure → heart rate → skin temperature → core body temperature. The function of on- and off-cells in nociception should be reexamined, taking into account their correlation with autonomic regulations. Copyright © 2014 the American Physiological Society.

  18. NG-PON2 Architecture Enabled by Heterogeneous Space Division Multiplexing with Distributed Light Source: A Proof-of-Concept Evaluation

    DEFF Research Database (Denmark)

    Asif, Rameez; Imran, Muhammad; Ye, Feihong

    2015-01-01

    We have numerically evaluated the next generation passive optical network stage-2 (NG-PON2) architecture based on heterogeneous space division multiplexing (SDM) and wavelength-division multiplexing (WDM). Error free transmission (BER of 10−9 ) is obtained for all the downstream (DS) and upstream...

  19. Novel WRM-based architecture of hybrid PON featuring online access and full-fiber-fault protection for smart grid

    Science.gov (United States)

    Li, Xingfeng; Gan, Chaoqin; Liu, Zongkang; Yan, Yuqi; Qiao, HuBao

    2018-01-01

    In this paper, a novel architecture of hybrid PON for smart grid is proposed by introducing a wavelength-routing module (WRM). By using conventional optical passive components, a WRM with M ports is designed. The symmetry and passivity of the WRM makes it be easily integrated and very cheap in practice. Via the WRM, two types of network based on different ONU-interconnected manner can realize online access. Depending on optical switches and interconnecting fibers, full-fiber-fault protection and dynamic bandwidth allocation are realized in these networks. With the help of amplitude modulation, DPSK modulation and RSOA technology, wavelength triple-reuse is achieved. By means of injecting signals into left and right branches in access ring simultaneously, the transmission delay is decreased. Finally, the performance analysis and simulation of the network verifies the feasibility of the proposed architecture.

  20. Design and performance investigation of LDPC-coded upstream transmission systems in IM/DD OFDM-PONs

    Science.gov (United States)

    Gong, Xiaoxue; Guo, Lei; Wu, Jingjing; Ning, Zhaolong

    2016-12-01

    In Intensity-Modulation Direct-Detection (IM/DD) Orthogonal Frequency Division Multiplexing Passive Optical Networks (OFDM-PONs), aside from Subcarrier-to-Subcarrier Intermixing Interferences (SSII) induced by square-law detection, the same laser frequency for data sending from Optical Network Units (ONUs) results in ONU-to-ONU Beating Interferences (OOBI) at the receiver. To mitigate those interferences, we design a Low-Density Parity Check (LDPC)-coded and spectrum-efficient upstream transmission system. A theoretical channel model is also derived, in order to analyze the detrimental factors influencing system performances. Simulation results demonstrate that the receiver sensitivity is improved 3.4 dB and 2.5 dB under QPSK and 8QAM, respectively, after 100 km Standard Single-Mode Fiber (SSMF) transmission. Furthermore, the spectrum efficiency can be improved by about 50%.

  1. Bandwidth efficient bidirectional 5 Gb/s overlapped-SCM WDM PON with electronic equalization and forward-error correction.

    Science.gov (United States)

    Buset, Jonathan M; El-Sahn, Ziad A; Plant, David V

    2012-06-18

    We demonstrate an improved overlapped-subcarrier multiplexed (O-SCM) WDM PON architecture transmitting over a single feeder using cost sensitive intensity modulation/direct detection transceivers, data re-modulation and simple electronics. Incorporating electronic equalization and Reed-Solomon forward-error correction codes helps to overcome the bandwidth limitation of a remotely seeded reflective semiconductor optical amplifier (RSOA)-based ONU transmitter. The O-SCM architecture yields greater spectral efficiency and higher bit rates than many other SCM techniques while maintaining resilience to upstream impairments. We demonstrate full-duplex 5 Gb/s transmission over 20 km and analyze BER performance as a function of transmitted and received power. The architecture provides flexibility to network operators by relaxing common design constraints and enabling full-duplex operation at BER ∼ 10(-10) over a wide range of OLT launch powers from 3.5 to 8 dBm.

  2. Mapping the calcitonin receptor in human brain stem

    DEFF Research Database (Denmark)

    Bower, Rebekah L; Eftekhari, Sajedeh; Waldvogel, Henry J

    2016-01-01

    understanding of these hormone systems by mapping CTR expression in the human brain stem, specifically the medulla oblongata. Widespread CTR-like immunoreactivity was observed throughout the medulla. Dense CTR staining was noted in several discrete nuclei, including the nucleus of the solitary tract...... receptors (AMY) are a heterodimer formed by the coexpression of CTR with receptor activity-modifying proteins (RAMPs). CTR with RAMP1 responds potently to both amylin and CGRP. The brain stem is a major site of action for circulating amylin and is a rich site of CGRP binding. This study aimed to enhance our...

  3. Effects of field high temperature on grain yield and quality of a subtropical type japonica rice—Pon-Lai rice

    Directory of Open Access Journals (Sweden)

    Yi-Chien Wu

    2016-01-01

    Full Text Available Typical japonica type rice is sensitive to high temperature. Pon-Lai rice is a special japonica type with adaptation to the subtropical climate in Taiwan. Facing climate change, rising temperatures would damage the yield and quality of rice production. This research was conducted using Pon-Lai rice in the field of a subtropical climate. We conducted 2 experiments, including a year-round experiment and collection of samples from different districts for building different temperature conditions. We analyzed the correlation between rising temperature and rice yield or quality. In our results, the critical period of temperature effect is 0–15 days after heading (H15. The threshold of high temperature damage in yield and appearance quality was 25–27 °C. Grain weight decreased about 2–6%, while the temperature of H15 was raised 1 °C above the thresholds. Perfect grain ratio and chalky grain ratio decreased and increased, respectively, while the temperature of H15 was raised above the thresholds. However, the high temperature in H15 affected the physicochemical characteristics. In addition, we found positive correlation between grain length to width ratio and perfect grain ratio. Grain length to width ratio could be an index of temperature effects for grain quality. In our study, when the temperature was below 30 °C, a rising temperature of H15 could damage rice yield and appearance quality, and change grain shape. Our results could provide reference for dealing with the warming future in other temperate rice-cultivated countries.

  4. Chirp-aided power fading mitigation for upstream 100 km full-range long reach PON with DBR DML

    Science.gov (United States)

    Zhang, Kuo; He, Hao; Xin, Haiyun; Hu, Weisheng; Liang, Song; Lu, Dan; Zhao, Lingjuan

    2018-01-01

    The DML is a promising option for cost-sensitive ONUs in optical access networks, but suffers from severe power fading due to dispersion and chirp. In this work, we investigate to mitigate the power fading by optimizing the chirp. Theoretical analysis indicates, a see-saw effect, influenced by the bias, exists between the adiabatic notch-induced fading (A-fading) and the transient notch-induced fading (T-fading). High bias can mitigate T-fading, but causes large A-fading. Low bias can avoid A-fading, but cannot completely mitigate T-fading. For each transmission distance, balance should be achieved to favor transmission. The ∼20 km short distance requires high bias to obtain large adiabatic chirp to counteract the T-fading, while the ∼100 km long distance requires relatively low bias to avoid the A-fading. With this power fading mitigation technique, we conduct upstream transmission experiment of LR-PON. Experiments show that, although signal contamination is inevitable, clear ;1; and ;0; are obtained with this power fading mitigation scheme for any 0 ∼100 km distance with 10 Gb/s OOK signal and DBR DML. The optical power budget penalty induced by 0 ∼100 km fiber is limited within only 2.2 dB, with optimum bias for each distance. More than 10 and 15 dB improvement is achieved when BER is 10-3 and 10-6. A method is also proposed to automatically obtain optimum bias from the ranging procedure of PON protocol.

  5. RNA-Seq analysis of glycosylation related gene expression in STZ-induced diabetic rat kidney inner medulla

    Directory of Open Access Journals (Sweden)

    Xiaoqian eQian

    2015-10-01

    Full Text Available The UT-A1 urea transporter is crucial to the kidney’s ability to generate concentrated urine. Native UT-A1 from kidney inner medulla (IM is a heavily glycosylated protein with two glycosylation forms of 97 and 117 kDa. In diabetes, UT-A1 protein abundance, particularly the 117 kD isoform, is significantly increased corresponding to an increased urea permeability in perfused IM collecting ducts, which plays an important role in preventing the osmotic diuresis caused by glucosuria. However, how the glycan carbohydrate structure change and the glycan related enzymes regulate kidney urea transport activity, particularly under diabetic condition, is largely unknown. In this study, using sugar-specific binding lectins, we found that the carbohydrate structure of UT-A1 is changed with increased amounts of sialic acid, fucose, and increased glycan branching under diabetic conditions. These changes were accompanied by altered UT-A1 association with the galectin proteins, α-galactoside glycan binding proteins. To explore the molecular basis of the alterations of glycan structures, the highly sensitive next generation sequencing (NGS technology, Illumina RNA-seq, was employed to analyze genes involved in the process of UT-A1 glycosylation using streptozotocin (STZ - induced diabetic rat kidney. Differential gene expression analysis combining quantitative PCR revealed that expression of a number of important glycosylation related genes were changed under diabetic conditions. These genes include the glycosyltransferase genes Mgat4a, the sialylation enzymes St3gal1 and St3gal4 and glycan binding protein galectin-3, -5, -8 and -9. In contrast, although highly expressed in kidney IM, the glycosyltransferase genes Mgat1, Mgat2, and fucosyltransferase Fut8, did not show any changes. Conclusions: In diabetes, not only is UT-A1 protein abundance increased but the protein’s glycan structure is also significantly changed. UT-A1 protein becomes highly sialylated

  6. Spatial organization of the vascular bundle and the interbundle region: three-dimensional reconstruction at the inner stripe of the outer medulla in the mouse kidney.

    Science.gov (United States)

    Ren, Hao; Gu, Ling; Andreasen, Arne; Thomsen, Jesper S; Cao, Liu; Christensen, Erik I; Zhai, Xiao-Yue

    2014-02-01

    The vascular bundle (VB) is a complex structure that resides in the inner stripe of the outer medulla. At present, the tubulovascular spatial organization of the VB, which is crucial for the formation of the osmolarity gradient and for solute transport, is still under debate. In this study, we used computer-assisted digital tracing combined with aquaporin-1 immunohistochemistry to reconstruct all tubules and vessels in the VB of the mouse kidney. We found, first, that the descending and ascending vasa recta travelled exclusively through the VB. The ascending vasa recta received no tributaries (no branches) along their entire path in the medulla and were not connected with the capillary plexus in the interbundle region. Second, a specific group of the descending vasa recta were closely accompanied by the longest ascending vasa recta, which connected only to the capillary plexus at the tip of the papilla. Third, the descending thin limbs of all short-looped nephrons travelled exclusively through the outer part of the VB. The loops of these nephrons (both descending and ascending parts) were distributed in a regular pattern based on their length. Finally, the thick ascending limbs of all long-looped nephrons were located at the margin of the VB (except a few within the VB), which formed a layer separating the VB from the interbundle region. In conclusion, our three-dimensional analysis of the VB strongly suggest a lateral osmolarity heterogeneity across the inner stripe of the outer medulla, which might work as a driving force for water and solute transport.

  7. Effects of life-long caloric restriction and voluntary exercise on age-related changes in levels of catecholamine biosynthetic enzymes and angiotensin II receptors in the rat adrenal medulla and hypothalamus.

    Science.gov (United States)

    Erdös, Benedek; Broxson, Christopher S; Landa, Tessa; Scarpace, Philip J; Leeuwenburgh, Christiaan; Zhang, Yi; Tümer, Nihal

    2007-08-01

    We examined if life-long mild caloric restriction (CR) alone or with voluntary exercise prevents the age-related changes in catecholamine biosynthetic enzyme levels in the adrenal medulla and hypothalamus. Ten-week-old Fisher-344 rats were assigned to: sedentary; sedentary+8% CR; or 8% CR+wheel running. Rats were euthanized at 6 or 24 months of age. Tyrosine hydroxylase (TH) mRNA expression was 4.4-fold higher in the adrenal medullae and 60% lower in the hypothalamus of old sedentary rats compared to young (pwheel running decreased AT(1) levels by 50% (pwheel running increased its level by 42% (pfood intake can avert age-related changes in catecholamine biosynthetic enzyme levels in the adrenal medulla and hypothalamus, possibly through affecting angiotensin II signaling.

  8. A WDM-PON with DPSK modulated downstream and OOK modulated upstream signals based on symmetric 10 Gbit/s wavelength reused bidirectional reflective SOA

    Science.gov (United States)

    El-Nahal, Fady I.

    2017-01-01

    We investigate a wavelength-division-multiplexing passive optical network (WDM-PON) with centralized lightwave and direct detection. The system is demonstrated for symmetric 10 Gbit/s differential phase-shift keying (DPSK) downstream signals and on-off keying (OOK) upstream signals, respectively. A wavelength reused scheme is employed to carry the upstream data by using a reflective semiconductor optical amplifier (RSOA) as an intensity modulator at the optical network unit (ONU). The constant-intensity property of the DPSK modulation format can keep high extinction ratio ( ER) of downstream signal and reduce the crosstalk to the upstream signal. The bit error rate ( BER) performance of our scheme shows that the proposed 10 Gbit/s symmetric WDM-PON can achieve error free transmission over 25-km-long fiber transmission with low power penalty.

  9. Wired/wireless access integrated RoF-PON with scalable generation of multi-frequency MMWs enabled by tunable optical frequency comb.

    Science.gov (United States)

    Xiang, Yu; Jiang, Ning; Chen, Chen; Zhang, Chongfu; Qiu, Kun

    2013-08-26

    In this paper, a novel wired/wireless access integrated radio-over-fiber passive optical network (RoF-PON) system that utilizes scalable multiple-frequency millimeter-wave (MF-MMW) generation based on tunable optical frequency comb (TOFC) is proposed. The TOFC is performed by cascading a phase modulator (PM) and two intensity modulators (IMs), and with proper selection of the peak-to-peak voltage of the PM, a flat and effective optical comb with tens of frequency lines is achieved. The MF-MMWs are generated by beating the optical comb line pairs with an interval about 60 GHz. The feasibility and scalability of the proposed wired/wireless access integrated RoF-PON scheme are confirmed by the simulations of simultaneous distribution of wired and wireless data with the proposed multiple frequency MMW generation technology.

  10. Insights into the Lactonase Mechanism of Serum Paraoxonase 1 (PON1): Experimental and Quantum Mechanics/Molecular Mechanics (QM/MM) Studies.

    Science.gov (United States)

    Le, Quang Anh Tuan; Kim, Seonghoon; Chang, Rakwoo; Kim, Yong Hwan

    2015-07-30

    Serum paraoxonase 1 (PON1) is a versatile enzyme for the hydrolysis of various substrates (e.g., lactones, phosphotriesters) and for the formation of a promising chemical platform γ-valerolactone. Elucidation of the PON1-catalyzed lactonase reaction mechanism is very important for understanding the enzyme function and for engineering this enzyme for specific applications. Kinetic study and hybrid quantum mechanics/molecular mechanics (QM/MM) method were used to investigate the PON1-catalyzed lactonase reaction of γ-butyrolactone (GBL) and (R)-γ-valerolactone (GVL). The activation energies obtained from the QM/MM calculations were in good agreement with the experiments. Interestingly, the QM/MM energy barriers at MP2/3-21G(d,p) level for the lactonase of GVL and GBL were respectively 14.3-16.2 and 11.5-13.1 kcal/mol, consistent with the experimental values (15.57 and 14.73 kcal/mol derived from respective kcat values of 36.62 and 147.21 s(-1)). The QM/MM energy barriers at MP2/6-31G(d) and MP2/6-31G(d,p) levels were also in relatively good agreements with the experiments. Importantly, the difference in the QM/MM energy barriers at MP2 level with all investigated basis sets for the lactonase of GVL and GBL were in excellent agreement with the experiments (0.9-3.1 and 0.8 kcal/mol, respectively). A detailed mechanism for the PON1-catalyzed lactonase reaction was also proposed in this study.

  11. Comparison of serum acetyl hydrolase (PAF-AH) and paraoxonase 1 (PON1) values between prostate cancer patients and a control group.

    Science.gov (United States)

    Benli, Erdal; Bayrak, Ahmet; Cirakoglu, Abdullah; Bayrak, Tulin; Noyan, Tevfik

    2017-11-01

    The aim of the study was to measure platelet-activating factor acetyl hydrolase (PAF-AH) and paraoxonase (PON1) enzyme activity levels in patients with high Psa values to compare with healthy peers and also to determine the efficacy of these parameters in predicting pathologic results of patients with high Psa values. This study included 66 patients with Psa value > 4 ng/dl (Group 1) and 44 patients with Psa PAF-AH, and MDA were compared between the groups. Additionally the same parameters were compared between patients with prostate biopsy performed due to high Psa and diagnosed with cancer and the control group with normal Psa values. The PAF-AH activity in Group 1 was 125.17 ± 8.64 and in Group 2 was 120.08 ± 9.23 U/ml (p = 0.003). The PON1 activity was 63.12 ± 6.74 and 65.91 ± 7.77 U/ml in the groups, respectively (p = 0.04). Additionally, there were significant differences identified between the control group and PCa diagnosis group in terms of PAF-AH and PON1 activities (p = 0.004 and p = 0.02, respectively). The enzyme activity of PAF-AH and PON1 measured in serum of patients with high Psa value and patients with diagnosis of prostate cancer (PCa) were identified to have changed by a significant amount compared to healthy peers with normal Psa value. It was concluded that these parameters may be beneficial markers for use in assessment of patients with high Psa value. Copyright © 2017. Published by Elsevier Taiwan.

  12. The neuroanatomy of vomiting in man: association of projectile vomiting with a solitary metastasis in the lateral tegmentum of the pons and the middle cerebellar peduncle.

    OpenAIRE

    Baker, P C; Bernat, J L

    1985-01-01

    Animal studies have indicated a "vomiting center" situated in the dorsal portion of the lateral reticular formation of the medulla at the level of the dorsal nucleus of the vagus. There is also a chemoreceptor trigger zone in the floor of the fourth ventricle in the area postrema which influences the vomiting center. A 63 year old man with a three year history of metastatic malignant melanoma presented with nausea, projectile vomiting, gait ataxia and diplopia associated with horizontal and v...

  13. Long term stability of paraoxonase-1 and high-density lipoprotein in human serum

    Directory of Open Access Journals (Sweden)

    Beekhof Piet K

    2012-05-01

    Full Text Available Abstract Background Paraoxonase-1 (PON1 is an enzyme with numerous functions and receives an increasing interest in clinical and epidemiological studies. Sometimes samples are stored for longer periods at a certain temperature. Therefore the stability of PON1 activity must be checked and retained upon storage for longer periods. Results In this study the stability of PON1 activity has been tested in human serum samples during storage up to 12 months at 3 commonly used temperatures, -20°C, -70°C and −196°C. It was found that the stability of the PON1 activity is constant during 12 months of storage at −70°C and −196°C. Storage at −20°C resulted in a small but statistically significant decrease after 6 months to about 94% of its original value. Nonetheless, the rank order between the samples at T = 0 and 12 months remained the same. The same temperature dependence was found for the associated high-density lipoprotein. Conclusions It can be concluded that −70°C is the right temperature for storage to maintain the PON1 activity for at least one year. Storage at a lower temperature in liquid nitrogen (−196°C is not necessary.

  14. Experimental demonstration of novel source-free ONUs in bidirectional RF up-converted optical OFDM-PON utilizing polarization multiplexing.

    Science.gov (United States)

    Zhang, Chongfu; Chen, Chen; Feng, Yuan; Qiu, Kun

    2012-03-12

    We propose and experimentally demonstrate a novel cost-effective optical orthogonal frequency-division multiplexing-based passive optical network (OFDM-PON) system, wherein all optical network units (ONUs) are source-free not only in the optical domain but also in the electric domain, by utilizing polarization multiplexing (PolMUX) in the downlink transmission. Two pure optical bands with a frequency interval of 10 GHz and downlink up-converted 10 GHz OFDM signal are carried in two orthogonal states of polarization (SOPs), respectively. 10 GHz radio frequency (RF) source can be generated by a heterodyne of two pure optical bands after polarization beam splitting in each ONU, therefore it can be used to down-convert the downlink OFDM signal and up-convert the uplink OFDM signal. In the whole bidirectional up-converted OFDM-PON system, only one single RF source is employed in the optical line terminal (OLT). Experimental results successfully verify the feasibility of our proposed cost-effective optical OFDM-PON system.

  15. DIANA: A Machine Learning Mechanism for Adjusting the TDD Uplink-Downlink Configuration in XG-PON-LTE Systems

    Directory of Open Access Journals (Sweden)

    Panagiotis Sarigiannidis

    2017-01-01

    Full Text Available Modern broadband hybrid optical-wireless access networks have gained the attention of academia and industry due to their strategic advantages (cost-efficiency, huge bandwidth, flexibility, and mobility. At the same time, the proliferation of Software Defined Networking (SDN enables the efficient reconfiguration of the underlying network components dynamically using SDN controllers. Hence, effective traffic-aware schemes are feasible in dynamically determining suitable configuration parameters for advancing the network performance. To this end, a novel machine learning mechanism is proposed for an SDN-enabled hybrid optical-wireless network. The proposed architecture consists of a 10-gigabit-capable passive optical network (XG-PON in the network backhaul and multiple Long Term Evolution (LTE radio access networks in the fronthaul. The proposed mechanism receives traffic-aware knowledge from the SDN controllers and applies an adjustment on the uplink-downlink configuration in the LTE radio communication. This traffic-aware mechanism is capable of determining the most suitable configuration based on the traffic dynamics in the whole hybrid network. The introduced scheme is evaluated in a realistic environment using real traffic traces such as Voice over IP (VoIP, real-time video, and streaming video. According to the obtained numerical results, the proposed mechanism offers significant improvements in the network performance in terms of latency and jitter.

  16. Power budget of direct-detection ultra-dense WDM-Nyquist-SCM PON with low-complexity SSBI mitigation

    Science.gov (United States)

    Soeiro, Ricardo O. J.; Alves, Tiago M. F.; Cartaxo, Adolfo V. T.

    2017-07-01

    The power budget (PB) of a direct-detection ultra-dense wavelength division/subcarrier multiplexing (SCM) passive optical network (PON) is assessed numerically for downstream, when a low-complexity iterative signal-to-signal beat interference (SSBI) mitigation technique is employed. Each SCM signal, inserted in a 12.5 GHz width optical channel, is comprised of two or three electrically generated and multiplexed 16-quadrature-amplitude-modulation (QAM) or 32-QAM Nyquist pulse-shaped subcarriers, each with a 7% forward error correction bit rate of 10.7 Gbit/s. The PB and maximum number of optical network units (ONUs) served by each optical line terminal (OLT) are compared with and without SSBI mitigation. When SSBI mitigation is realized, PB gains up to 4.5 dB are attained relative to the PB in the absence of SSBI mitigation. The PB gain enabled by the SSBI mitigation technique proposed in this work increases the number of ONUs served per OLT at least by a factor of 2, for the cases of higher spectral efficiency. In particular, for a SCM signal comprised of three subcarriers, the maximum number of ONUs served per OLT is between 2 and 32, and between 8 and 64, in the absence of SSBI mitigation, and when SSBI mitigation is employed, respectively, depending on the fiber length (up to 50 km) and order of QAM.

  17. The distribution of nicotinamide adenine dinucleotide phosphate-diaphorase (NADPH-d) in the medulla oblongata, spinal cord, cranial and spinal nerves of frog, Microhyla ornata.

    Science.gov (United States)

    Jadhao, Arun G; Biswas, Saikat P; Bhoyar, Rahul C; Pinelli, Claudia

    2017-04-01

    Nicotinamide adenine dinucleotide phosphate-diaphorase (NADPH-d) enzymatic activity has been reported in few amphibian species. In this study, we report its unusual localization in the medulla oblongata, spinal cord, cranial nerves, spinal nerves, and ganglions of the frog, Microhyla ornata. In the rhombencephalon, at the level of facial and vagus nerves, the NADPH-d labeling was noted in the nucleus of the abducent and facial nerves, dorsal nucleus of the vestibulocochlear nerve, the nucleus of hypoglossus nerve, dorsal and lateral column nucleus, the nucleus of the solitary tract, the dorsal field of spinal grey, the lateral and medial motor fields of spinal grey and radix ventralis and dorsalis (2-10). Many ependymal cells around the lining of the fourth ventricle, both facial and vagus nerves and dorsal root ganglion, were intensely labeled with NADPH-d. Most strikingly the NADPH-d activity was seen in small and large sized motoneurons in both medial and lateral motor neuron columns on the right and left sides of the brain. This is the largest stained group observed from the caudal rhombencephalon up to the level of radix dorsalis 10 in the spinal cord. The neurons were either oval or elongated in shape with long processes and showed significant variation in the nuclear and cellular diameter. A massive NADPH-d activity in the medulla oblongata, spinal cord, and spinal nerves implied an important role of this enzyme in the neuronal signaling as well as in the modulation of motor functions in the peripheral nervous systems of the amphibians. Copyright © 2017 Elsevier B.V. All rights reserved.

  18. Distribution of glycine/GABA neurons in the ventromedial medulla with descending spinal projections and evidence for an ascending glycine/GABA projection.

    Science.gov (United States)

    Hossaini, Mehdi; Goos, Jacqueline A C; Kohli, Somesh K; Holstege, Jan C

    2012-01-01

    The ventromedial medulla (VM), subdivided in a rostral (RVM) and a caudal (CVM) part, has a powerful influence on the spinal cord. In this study, we have identified the distribution of glycine and GABA containing neurons in the VM with projections to the cervical spinal cord, the lumbar dorsal horn, and the lumbar ventral horn. For this purpose, we have combined retrograde tracing using fluorescent microspheres with fluorescent in situ hybridization (FISH) for glycine transporter 2 (GlyT2) and GAD67 mRNAs to identify glycinergic and/or GABAergic (Gly/GABA) neurons. Since the results obtained with FISH for GlyT2, GAD67, or GlyT2 + GAD67 mRNAs were not significantly different, we concluded that glycine and GABA coexisted in the various projection neurons. After injections in the cervical cord, we found that 29% ± 1 (SEM) of the retrogradely labeled neurons in the VM were Gly/GABA (RVM: 43%; CVM: 21%). After lumbar dorsal horn injections 31% ± 3 of the VM neurons were Gly/GABA (RVM: 45%; CVM: 12%), and after lumbar ventral horn injections 25% ± 2 were Gly/GABA (RVM: 35%; CVM: 17%). In addition, we have identified a novel ascending Gly/GABA pathway originating from neurons in the area around the central canal (CC) throughout the spinal cord and projecting to the RVM, emphasizing the interaction between the ventromedial medulla and the spinal cord. The present study has now firmly established that GABA and glycine are present in many VM neurons that project to the spinal cord. These neurons strongly influence spinal processing, most notably the inhibition of nociceptive transmission.

  19. Distribution of glycine/GABA neurons in the ventromedial medulla with descending spinal projections and evidence for an ascending glycine/GABA projection.

    Directory of Open Access Journals (Sweden)

    Mehdi Hossaini

    Full Text Available The ventromedial medulla (VM, subdivided in a rostral (RVM and a caudal (CVM part, has a powerful influence on the spinal cord. In this study, we have identified the distribution of glycine and GABA containing neurons in the VM with projections to the cervical spinal cord, the lumbar dorsal horn, and the lumbar ventral horn. For this purpose, we have combined retrograde tracing using fluorescent microspheres with fluorescent in situ hybridization (FISH for glycine transporter 2 (GlyT2 and GAD67 mRNAs to identify glycinergic and/or GABAergic (Gly/GABA neurons. Since the results obtained with FISH for GlyT2, GAD67, or GlyT2 + GAD67 mRNAs were not significantly different, we concluded that glycine and GABA coexisted in the various projection neurons. After injections in the cervical cord, we found that 29% ± 1 (SEM of the retrogradely labeled neurons in the VM were Gly/GABA (RVM: 43%; CVM: 21%. After lumbar dorsal horn injections 31% ± 3 of the VM neurons were Gly/GABA (RVM: 45%; CVM: 12%, and after lumbar ventral horn injections 25% ± 2 were Gly/GABA (RVM: 35%; CVM: 17%. In addition, we have identified a novel ascending Gly/GABA pathway originating from neurons in the area around the central canal (CC throughout the spinal cord and projecting to the RVM, emphasizing the interaction between the ventromedial medulla and the spinal cord. The present study has now firmly established that GABA and glycine are present in many VM neurons that project to the spinal cord. These neurons strongly influence spinal processing, most notably the inhibition of nociceptive transmission.

  20. J.H. Pons on 'Sympathetic insanity': With an introduction by GE Berrios.

    Science.gov (United States)

    Berrios, G E; Pons, J H

    2014-09-01

    The ancient concept of 'sympathy' originally referred to a putative affinity or force that linked all natural objects together. This notion was later used to explain the manner in which human beings related and felt for each other. A large literature exists on both the physical and psychological definitions of sympathy. Until the nineteenth century the conceptual apparatus of medicine preserved the view that the organs of the human body had a sympathetic affinity for each other. In addition to these 'physiological' (normal) sympathies there were morbid ones which explained the existence of various diseases. A morbid sympathy link also explained the fact that insanity followed the development of pathological changes in the liver, spleen, stomach and other bodily organs. These cases were classified as 'sympathetic insanities'. After the 1880s, the sympathy narrative was gradually replaced by physiological, endocrinological and psychodynamic explanations. The clinical states involved, however, are often observed in hospital practice and constitute the metier of 'consultation-liaison psychiatry'. Hence, it is surprising that historical work on the development of this discipline has persistently ignored the concept of 'sympathetic insanity'. © The Author(s) 2014.

  1. Organization of cholinergic, putative catecholaminergic and serotonergic nuclei in the diencephalon, midbrain and pons of sub-adult male giraffes.

    Science.gov (United States)

    Bux, Faiza; Bhagwandin, Adhil; Fuxe, Kjell; Manger, Paul R

    2010-05-01

    The current study describes the nuclear organization and neuronal morphology of the cholinergic, putative catecholaminergic and serotonergic systems within the diencephalon, midbrain and pons of the giraffe using immunohistochemistry for choline acetyltransferase, tyrosine hydroxylase and serotonin. The giraffe has a unique phenotype (the long neck), a large brain (over 500 g) and is a non-domesticated animal, while previous studies examining the brains of other Artiodactyls have all been undertaken on domesticated animals. The aim of the present study was to investigate possible differences in the nuclear organization and neuronal morphology of the above-mentioned systems compared to that seen in other Artiodactyls and mammals. The nuclear organization of all three systems within the giraffe brain was similar to that of other Artiodactyls. Some features of interest were noted for the giraffe and in comparison to other mammals studied. The cholinergic neuronal somata of the laterodorsal tegmental nucleus were slightly larger than those of the pedunculopontine tegmental nucleus, a feature not described in other mammals. The putative catecholaminergic system of the giraffe appeared to lack an A15 dorsal nucleus, which is commonly seen in other mammals but absent in the Artiodactyls, had a large and expanded substantia nigra pars reticulata (A9 ventral), a small diffuse portion of the locus coerueleus (A6d), an expansive subcoeruleus (A7sc and A7d), and lacked the A4 nucleus of the locus coeruleus complex. The nuclear organization of the serotonergic system of the giraffe was identical to that seen in all other eutherian mammals studied to date. These observations in the giraffe demonstrate that despite significant changes in life history, phenotype, brain size and time of divergence, species within the same order show the same nuclear organization of the systems investigated. Copyright (c) 2009 Elsevier B.V. All rights reserved.

  2. Clinical study of central taste disorders and discussion of the central gustatory pathway.

    Science.gov (United States)

    Onoda, Keiko; Ikeda, Minoru; Sekine, Hiroki; Ogawa, Hisashi

    2012-02-01

    The aim of this work is to examine the clinical findings of patients with taste disorders due to central lesions and also to study the central gustatory pathway in humans. We conducted a retrospective review of 13 patients with central taste disorders that visited Nihon University Itabashi Hospital. An additional 25 cases with central taste disorders previously reported in the literature were assessed in the study. We examined 38 patients with taste disorders due to central lesions. The sites of the central lesions and their frequencies, the laterality of taste disorders relative to the central lesions, and prognosis of taste disorders were studied. We identified the following taste-related regions in the central nervous system: the medulla, pons, midbrain, thalamus, internal capsule, putamen, corona radiata, and cerebral cortex. As for the laterality of the taste disorders, we observed more ipsilateral cases for lesions located from the medulla to the pons. We observed ipsilateral, contralateral, and bilateral cases for lesions located above the midbrain, but bilateral cases were more frequently detected. Taste disorders of 80% of the patients improved by 24 weeks. The prognoses of central taste disorders appeared to be good. We identified eight central regions supposed to be relate to taste disorders. From the laterality of the taste disorders relative to the central lesions, it was suggested that the central gustatory pathway ascends ipsilaterally from the medulla to the pons, branches at the upper pons, and then ascends bilaterally from the midbrain to the cerebral cortex.

  3. Generation of a panel of somatic cell hybrids containing fragments of human chromosome 12P by X-ray irradiation and cell fusion

    NARCIS (Netherlands)

    Sinke, R J; Suijkerbuijk, R F; Herbergs, J; Janssen, H; Cassiman, J J; Geurts van Kessel, A

    We have employed an irradiation and fusion procedure to generate somatic cell hybrids containing various fragments of the short arm of human chromosome 12 using a 12p-only hybrid (M28) as starting material. For the initial identification of hybrids retaining human DNA, nonradioactive in situ

  4. Amidated joining peptide in the human pituitary, gut, adrenal gland and bronchial carcinoids. Immunocytochemical and immunochemical evidence

    DEFF Research Database (Denmark)

    Bjartell, A; Fenger, M; Ekman, R

    1990-01-01

    .g., ACTH, beta-endorphin, Pro-tau-MSH, in the pituitary gland and adrenal medulla. The JP-N immunoreactive cells in the adrenal medulla were identified as a subpopulation of adrenaline-producing cells by means of an antiserum against phenylethanolamine N-methyltransferase. In the gut immunoreactive JP......-N, respectively, but under reduced conditions most of the immunoreactive material appeared as of low molecular weight in both extracts. In conclusion, immunoreactive JP-N is a major product from the processing of proopiomelanocortin in human extrapituitary tissues. The molecular forms of immunoreactive JP...

  5. Adaptación española de la versión reducida multicanal del Perfil de Sensibilidad No Verbal (MiniPONS

    Directory of Open Access Journals (Sweden)

    Francisco Martínez-Sánchez

    2013-05-01

    Full Text Available En este trabajo se presenta la adaptación española de la versión reducida multicanal del Perfil de Sensibilidad No Verbal (MiniPONS (Bänziger, Scherer, Hall y Rosenthal, 2011. Esta escala evalúa las diferencias individuales en la habilidad para reconocer emociones, actitudes interpersonales y comunicación de intenciones por canales no verbales. Esta versión multicanal reducida está compuesta por 64 estímulos no verbales de vídeo y/o audio que representan a una mujer en blanco y negro. El principal objetivo de este estudio es analizar las propiedades psicométricas del MiniPONS empleando para ello una amplia muestra de participantes (N = 1154 de entre 18 a 60 años, también se examinaron las diferencias en la sensibilidad no verbal en función del sexo y la edad. Se presentan los valores normativos, la fiabilidad y validez en tres estudios con 168, 254 y 1154 estudiantes universitarios. Los resultados muestran que las mujeres obtienen mejores puntuaciones en todas las condiciones estimulares, éstas no sólo procesan más eficientemente información emocional no verbal por canales unisensoriales (rostro, cuerpo, voz, si no que también la integran mejor. Los resultados indican que la versión española del MiniPONS presenta unas propiedades psicométricas similares a la escala original, mostrando moderada consistencia interna y fiabilidad test-retest, así como también una razonable validez convergente obtenida en las correlaciones con otras pruebas que evalúan la capacidad de reconocimiento emocional. Se concluye que la versión española del MiniPONS es un instrumento que evalúa adecuadamente la sensibilidad no verbal. Se discuten las limitaciones y potencial utilidad de la escala.

  6. Four-fold increase in users of time-wavelength division multiplexing (TWDM) passive optical network (PON) by delayed optical amplitude modulation (AM) upstream

    Science.gov (United States)

    Kachhatiya, Vivek; Prince, Shanthi

    2016-12-01

    In this paper, we have proposed and simulated optical time division multiplexed passive optical network (TDM-PON) using delayed optical amplitude modulation (AM). Eight upstream wavelengths are demonstrated to show optical time wavelength division multiplexed (TWDM) by combining optical network units (ONU) users data at the remote node (RN). Each ONU generates 2.5 Gb/s user data, and it is modulated using novel return to zero (RZ) delayed AM. Optical TDM aggregates 10 Gb/s data per wavelength from four 2.5 Gb/s upstream user data, which facilitates four different ONU data on the same wavelength as 10 Gb/s per upstream wavelength and, simplify the laser requirements (2.5 Gb/s) at each optical network unit (ONU) transmitter. Upstream optical TWDM-PON is investigated for eight wavelengths with wavelength spacing of 100 GHz. Novel optical TDM for upstream increased the number of the simultaneous user to fourfold from conventional TWDM-PON using delayed AM with a high-quality-factor of received signal. Despite performance degradation due to different fiber reach and dispersion compensation technique, Optical TWDM link shows significant improvement regarding receiver sensitivity when compared with common TWDM link. Hence, it offers optimistic thinking to show optical TDM at this phase as one of the future direction, where complex digital signal processing (DSP) and coherent optical communication are frequently demonstrated to serve the access network. Downstream side conventional TWDM eight wavelengths are multiplexed at the OLT and sent downstream to serve distributed tunable ONU receivers through an optical distribution network (ODN). Each downstream wavelengths are modulated at the peak rate of 10 Gb/s using non-return to zero external modulation (NRZ-EM). The proposed architecture is cost efficient and supports high data rates as well as ;pay as you grow; network for both service providers and the users perspectives. Users are classified into two categories viz home

  7. VCSEL Based Coherent PONs

    DEFF Research Database (Denmark)

    Jensen, Jesper Bevensee; Rodes, Roberto; Caballero Jambrina, Antonio

    2014-01-01

    We present a review of research performed in the area of coherent access technologies employing vertical cavity surface emitting lasers (VCSELs). Experimental demonstrations of optical transmission over a passive fiber link with coherent detection using VCSEL local oscillators and directly...... modulated VCSEL transmitters at bit rates up to 10 Gbps in the C-band as well as in the O-band are presented. The broad linewidth and frequency chirp associated with directly modulated VCSELs are utilized in an envelope detection receiver scheme which is demonstrated digitally (off-line) as well as analog...... (real-time). Additionally, it is shown that in the optical front-end of a coherent receiver for access networks, the 90 ° hybrid can be replaced by a 3-dB coupler. The achieved results show that VCSELs are attractive light source candidates for transmitter as well as local oscillator for coherent...

  8. Real-time experimental demonstration of low-cost VCSEL intensity-modulated 11.25 Gb/s optical OFDM signal transmission over 25 km PON systems.

    Science.gov (United States)

    Hugues-Salas, E; Giddings, R P; Jin, X Q; Wei, J L; Zheng, X; Hong, Y; Shu, C; Tang, J M

    2011-02-14

    The feasibility of utilising low-cost, un-cooled vertical cavity surface-emitting lasers (VCSELs) as intensity modulators in real-time optical OFDM (OOFDM) transceivers is experimentally explored, for the first time, in terms of achievable signal bit rates, physical mechanisms limiting the transceiver performance and performance robustness. End-to-end real-time transmission of 11.25 Gb/s 64-QAM-encoded OOFDM signals over simple intensity modulation and direct detection, 25 km SSMF PON systems is experimentally demonstrated with a power penalty of 0.5 dB. The low extinction ratio of the VCSEL intensity-modulated OOFDM signal is identified to be the dominant factor determining the maximum obtainable transmission performance. Experimental investigations indicate that, in addition to the enhanced transceiver performance, adaptive power loading can also significantly improve the system performance robustness to variations in VCSEL operating conditions. As a direct result, the aforementioned capacity versus reach performance is still retained over a wide VCSEL bias (driving) current (voltage) range of 4.5 mA to 9 mA (275 mVpp to 320 mVpp). This work is of great value as it demonstrates the possibility of future mass production of cost-effective OOFDM transceivers for PON applications.

  9. Pigment-dispersing factor (PDF) has different effects on Drosophila's circadian clocks in the accessory medulla and in the dorsal brain.

    Science.gov (United States)

    Wülbeck, Corinna; Grieshaber, Eva; Helfrich-Förster, Charlotte

    2008-10-01

    The neuropeptide pigment-dispersing factor (PDF) is a key transmitter in the circadian clock of Drosophila melanogaster. Here we studied the rhythmic behavior of neural mutants with modified arborizations of the large PDF neurons. In sine oculis(1) (so(1)) mutants we found a higher density of PDF fibers in the fly's pacemaker center, the accessory medulla. These flies exhibited a significantly longer period (24.6 h) than control flies. When PDF levels were elevated to very high levels in the dorsal brain as true for so(mda) mutants and small optic lobes;so(1) double mutants (sol(1);so( 1)), a short-period component split off the long period in behavioral rhythmicity. The short period became shorter the higher the amount of PDF in this brain region and reached a value of approximately 21 h. The period alterations were clearly dependent on PDF, because so(1);Pdf 01 and so(mda);Pdf 01 double mutants showed a single free-running component with a period similar to Pdf 01 mutants (approximately 22.5 h) and significantly longer than the short period of so(mda) mutants. These observations indicate that PDF feeds back on the clock neurons and changes their period. Obviously, PDF lengthens the period of some clock neurons and shortens that of others.

  10. Blockade of Adrenal Medulla-Derived Epinephrine Potentiates Bee Venom-Induced Antinociception in the Mouse Formalin Test: Involvement of Peripheral β-Adrenoceptors

    Directory of Open Access Journals (Sweden)

    Suk-Yun Kang

    2013-01-01

    Full Text Available The injection of diluted bee venom (DBV into an acupoint has been used traditionally in eastern medicine to treat a variety of inflammatory chronic pain conditions. We have previously shown that DBV had a potent antinociceptive efficacy in several rodent pain models. However, the peripheral mechanisms underlying DBV-induced antinociception remain unclear. The present study was designed to investigate the role of peripheral epinephrine on the DBV-induced antinociceptive effect in the mouse formalin assay. Adrenalectomy significantly enhanced the antinociceptive effect of DBV during the late phase of the formalin test, while chemical sympathectomy had no effect. Intraperitoneal injection of epinephrine blocked this adrenalectomy-induced enhancement of the DBV-induced antinociceptive effect. Moreover, injection of a phenylethanolamine N-methyltransferase (PNMT inhibitor enhanced the DBV-induced antinociceptive effect. Administration of nonselective β-adrenergic antagonists also significantly potentiated this DBV-induced antinociception, in a manner similar to adrenalectomy. These results demonstrate that the antinociceptive effect of DBV treatment can be significantly enhanced by modulation of adrenal medulla-derived epinephrine and this effect is mediated by peripheral β-adrenoceptors. Thus, DBV acupoint stimulation in combination with inhibition of peripheral β-adrenoceptors could be a potentially novel strategy for the management of inflammatory pain.

  11. Intra-periaqueductal grey microinjections of an imidazo[1,2-b]pyridazine derivative, DM2, affects rostral ventromedial medulla cell activity and shows antinociceptive effect.

    Science.gov (United States)

    Palazzo, Enza; Rimoli, Maria Grazia; De Chiaro, Maria; Guida, Francesca; Melisi, Daniela; Curcio, Annalisa; de Novellis, Vito; Marabese, Ida; Rossi, Francesco; Abignente, Enrico; Maione, Sabatino

    2010-03-01

    The 6-methoxy-2-phenylimidazo[1,2-b]pyridazine-3-carboxylic acid, DM2, exerts anti-absence activity and blocks Cav3.1 channel, a T-type voltage-dependent Ca(2+) channel subtype, in vitro. The current study investigated the effect of intra-ventrolateral periaqueductal grey (VLPAG) administration of DM2 on formalin-induced nocifensive responses in rats. In addition, the effect of intra-VLPAG microinjection of DM2 on the ongoing and tail flick-related activities of rostral ventromedial medulla (RVM) cell population was also investigated. Formalin was injected subcutaneously into the dorsal surface of the hind paws of awake rats. We found that DM2 reduced nocifensive responses in the late phase of the formalin test. Moreover, in the RVM, the intra-VLPAG microinjection of DM2 reduced the ongoing and tail flick-related activity of the nociceptive ON cells, whereas it increased the ongoing activity and reduced the tail flick-induced pause of the antinociceptive OFF cells, consistent with antinociception. Behavioural and electrophysiological effects were reproduced by intra-VLPAG microinjection of ethosuximide, a conventional T-type Ca(2+) channel blocker. Finally, DM2 administration did not produce any adverse cardiovascular effects as blood pressure and heart rate remained unchanged. In conclusion, DM2 plays an analgesic role in vivo and changes RVM cell activity, consistent with antinociception. These effects were even more potent than those elicited by ethosuximide treatments. Copyright 2009 Elsevier Ltd. All rights reserved.

  12. Activation of the Mammalian Target of Rapamycin in the Rostral Ventromedial Medulla Contributes to the Maintenance of Nerve Injury-Induced Neuropathic Pain in Rat

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    Jian Wang

    2015-01-01

    Full Text Available The mammalian target of rapamycin (mTOR, a serine-threonine protein kinase, integrates extracellular signals, thereby modulating several physiological and pathological processes, including pain. Previous studies have suggested that rapamycin (an mTOR inhibitor can attenuate nociceptive behaviors in many pain models, most likely at the spinal cord level. However, the mechanisms of mTOR at the supraspinal level, particularly at the level of the rostral ventromedial medulla (RVM, remain unclear. Thus, the aim of this study was to elucidate the role of mTOR in the RVM, a key relay region for the descending pain control pathway, under neuropathic pain conditions. Phosphorylated mTOR was mainly expressed in serotonergic spinally projecting neurons and was significantly increased in the RVM after spared nerve injury- (SNI- induced neuropathic pain. Moreover, in SNI rat brain slices, rapamycin infusion both decreased the amplitude instead of the frequency of spontaneous excitatory postsynaptic currents and reduced the numbers of action potentials in serotonergic neurons. Finally, intra-RVM microinjection of rapamycin effectively alleviated established mechanical allodynia but failed to affect the development of neuropathic pain. In conclusion, our data provide strong evidence for the role of mTOR in the RVM in nerve injury-induced neuropathic pain, indicating a novel mechanism of mTOR inhibitor-induced analgesia.

  13. Regulation of the sympathetic nervous system by nitric oxide and oxidative stress in the rostral ventrolateral medulla: 2012 Academic Conference Award from the Japanese Society of Hypertension.

    Science.gov (United States)

    Kishi, Takuya

    2013-10-01

    Sympathoexcitation has an important role in the pathogenesis of hypertension. Previous studies have demonstrated that nitric oxide (NO) and/or oxidative stress in the brain are important for the regulation of the sympathetic nervous system. We have investigated the role of NO derived from an overexpression of endothelial NO synthase (eNOS) or oxidative stress in the rostral ventrolateral medulla (RVLM), which is known as a vasomotor center in the brainstem, on the regulation of the sympathetic nervous system. Our results indicated that NO derived from an overexpression of eNOS in the RVLM caused sympathoinhibition via an increase in γ-amino butyric acid and that angiotensin II type 1 receptor (AT1R)-induced oxidative stress in the RVLM caused sympathoexcitation. We also demonstrated that oxidative stress in the RVLM caused sympathoexcitation via interactions with NO, effects on the signal transduction or apoptosis of the astrocytes. Furthermore, several orally administered AT1R blockers have been found to cause sympathoinhibition via a reduction in oxidative stress through the blockade of AT1R in the RVLM of hypertensive rats. In conclusion, our studies suggest that the increase in AT1R-induced oxidative stress and/or the decrease in NO in the RVLM mainly cause sympathoexcitation in hypertension.

  14. Blockade of angiotensin AT1-receptors in the rostral ventrolateral medulla of spontaneously hypertensive rats reduces blood pressure and sympathetic nerve discharge

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    Andrew M Allen

    2001-03-01

    Full Text Available Microinjections of angiotensin II (Ang II into the rostral ventrolateral medulla (RVLM induce a sympathetically-mediated increase in blood pressure (BP, through an interaction with AT1-receptors. Under basal conditions in anaesthetised animals, microinjections of AT 1-receptor antagonists into the RVLM have little, or no effect on BP, suggesting that the angiotensin input to this nucleus is not tonically active. In contrast, microinjections of AT1-receptor antagonists into the RVLM of sodium-deplete rats and TGR(mRen227 rats, induce a depressor response through sympatho-inhibition. This indicates that when the renin-angiotensin system is activated, angiotensin can act in the RVLM to support sympathetic nerve discharge and BP. This study examined whether angiotensin inputs to the RVLM are activated in the spontaneously hypertensive rat — a pathophysiological model which displays increases in both brain angiotensin levels and sympathetic nerve activity. Bilateral microinjections of the AT 1-receptor antagonist candesartan cilexetil, (1 nmol in 100 nl, into the RVLM of the spontaneously hypertensive rat induced a significant decrease in lumbar sympathetic nerve discharge (-18±2% and BP (140±6 to 115±6 mmHg. In contrast, similar microinjections in the Wistar-Kyoto (WKY rat had no effect on BP or sympathetic nerve discharge. These results are interpreted to suggest that Ang II inputs to the RVLM are activated in the spontaneously hypertensive rat to maintain an elevated level of sympathetic nerve discharge, even in the face of increased BP.

  15. Comparative physiology and architecture associated with the mammalian urine concentrating mechanism: role of inner medullary water and urea transport pathways in the rodent medulla

    Science.gov (United States)

    2013-01-01

    Comparative studies of renal structure and function have potential to provide insights into the urine-concentrating mechanism of the mammalian kidney. This review focuses on the tubular transport pathways for water and urea that play key roles in fluid and solute movements between various compartments of the rodent renal inner medulla. Information on aquaporin water channel and urea transporter expression has increased our understanding of functional segmentation of medullary thin limbs of Henle's loops, collecting ducts, and vasa recta. A more complete understanding of membrane transporters and medullary architecture has identified new and potentially significant interactions between these structures and the interstitium. These interactions are now being introduced into our concept of how the inner medullary urine-concentrating mechanism works. A variety of regulatory pathways lead directly or indirectly to variable patterns of fluid and solute movements among the interstitial and tissue compartments. Animals with the ability to produce highly concentrated urine, such as desert species, are considered to exemplify tubular structure and function that optimize urine concentration. These species may provide unique insights into the urine-concentrating process.1 PMID:23364530

  16. ASSOCIATION OF POLYMORPHISMS GLN192ARG PON1 AND S3238G APOC3 IN WOMEN WITH CORONARY HEART DISEASE AND DIABETES MELLITUS TYPE 2 AND HYPOTHYROIDISM

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    A. P. Fyodorova

    2017-01-01

    Full Text Available Objective: to determine the frequency of alleles and genotypes of gene polymorphism PON1 — Gln192Arg A> G and ApoC3 — 3238C> G in women with coronary heart disease (CHD and diabetes mellitus type 2 (DM 2 and hypothyroidism, to determine the odds ratio (OR andrelative risk (RR of CHD depending on the genetic characteristics in this group of patients. Material and Methods: the studied 108 patients with stable angina II-III functional class, 35 of which have a combination of type 2 diabetes and hypothyroidism — 1 comparison group,36 women were with type 2 diabetes — 2 comparison group, 37 women with hypothyroidism — Group 3 comparison. The control group included 42 patients with stable angina II-III functional class without pathology of carbohydrate metabolism and the normal function of the thyroidgland. In addition, to eliminate the influence of hypothyroidism factor 4 comparison group was created (1 + 2 group, to avoid the influence of diabetes factor — 5 comparison group (1 + 3 group. Determined PON1 polymorphisms — Gln192Arg A> G and ApoC3 — 3238C> G bypolymerase chain reaction.Results: in women with coronary heart disease combined with type 2 diabetes is more common homozygous carriers of AA genotype polymorphism Gln192Arg PON1 (p = 0.03 for group 2, P = 0.04 for the 4 groups, respectively, while OR was 9.8 ( 95% CI,1,15-84,8 2 group and 7.5 (95% CI, 0,9-60,4 for group 4, respectively. OR CHD was 2.11 (95% CI, 1.4-3.0 and 1.54 (95% CI, 1,2-1,95 2 and group 4, respectively. In patients with coronary artery disease combined with type 2 diabetes showed more frequent carriers of the allele C (p = 0.02 and CG genotype polymorphism S3238G APOC3 (p = 0.01. OR 2 groups was 2.8 (95% CI, 1,0-7,8 for 4 groups — 2.7 (95% CI, 1,18-6,4. OR for CHD patients 4 groups was 1.5 (95% CI, 1,0-2,3.Conclusion: the association of genotype polymorphisms Gln192Arg PON1 and S3238G APOC3 in women with coronary heart disease in the background

  17. Effect of aqueous extract of “eryngium campestre” on the prevention of pathologic alterations caused by calcium oxalate crystals induced by ethylene glycol in the cortex and medulla of rats’ kidneys

    OpenAIRE

    Sajjad Esmaeili; Mehran Falahpour amiry; Abdolghader Taene; Mina Hemmati; Mohammad Malekaneh

    2017-01-01

    Background and Aim: Due to the effects of herbs in the prevention of kidney stones, the present study aimed at assessing the effect of aqueous eryngium campestre on the prevention of pathologic alterations caused by calcium oxalate crystals induced by ethylene glycol in the cortex and medulla of rats’kidneys. Materials and Methods: To conduct the study 40 male Wistar rats, weighing 200 – 250 gr were randomly divided into 5 equal groups; i.e. the healthy control group that just ...

  18. Remote heterodyne millimeter-wave over fiber based OFDM-PON with master-to-slave injected dual-mode colorless FPLD pair.

    Science.gov (United States)

    Chen, Hsiang-Yu; Chi, Yu-Chieh; Lin, Gong-Ru

    2015-08-24

    A remote heterodyne millimeter-wave (MMW) carrier at 47.7 GHz over fiber synthesized with the master-to-slave injected dual-mode colorless FPLD pair is proposed, which enables the future connection between the wired fiber-optic 64-QAM OFDM-PON at 24 Gb/s with the MMW 4-QAM OFDM wireless network at 2 Gb/s. Both the single- and dual-mode master-to-slave injection-locked colorless FPLD pairs are compared to optimize the proposed 64-QAM OFDM-PON. For the unamplified single-mode master, the slave colorless FPLD successfully performs the 64-QAM OFDM data at 24 Gb/s with EVM, SNR and BER of 8.5%, 21.5 dB and 2.9 × 10(-3), respectively. In contrast, the dual-mode master-to-slave injection-locked colorless FPLD pair with amplified and unfiltered master can transmit 64-QAM OFDM data at 18 Gb/s over 25-km SMF to provide EVM, SNR and BER of 8.2%, 21.8 dB and 2.2 × 10(-3), respectively. For the dual-mode master-to-slave injection-locked colorless FPLD pair, even though the modal dispersion occurred during 25-km SMF transmission makes it sacrifice the usable OFDM bandwidth by only 1 GHz, which guarantees the sufficient encoding bitrate for the optically generated MMW carrier to implement the fusion of MMW wireless LAN and DWDM-PON with cost-effective and compact architecture. As a result, the 47.7-GHz MMW carrier remotely beat from the dual-mode master-to-slave injection-locked colorless FPLD pair exhibits an extremely narrow bandwidth of only 0.48 MHz. After frequency down-conversion operation, the 47.7-GHz MMW carrier successfully delivers 4-QAM OFDM data up to 2 Gb/s with EVM, SNR and BER of 33.5%, 9.51 dB and 1.4 × 10(-3), respectively.

  19. Neurochemical organization of the nucleus paramedianus dorsalis in the human

    OpenAIRE

    Baizer, Joan S.; Baker, James F.; Haas, Kristin; Lima, Raquel

    2007-01-01

    We have characterized the neurochemical organization of a small brainstem nucleus in the human brain, the nucleus paramedianus dorsalis (PMD). PMD is located adjacent and medial to the nucleus prepositus hypoglossi (PH) in the dorsal medulla, and is distinguished by the pattern of immunoreactivity of cells and fibers to several markers including calcium-binding proteins, a synthetic enzyme for nitric oxide (neuronal nitric oxide synthase, nNOS) and a nonphosphorylated neurofilament protein (a...

  20. The dorsomedial hypothalamus mediates stress-induced hyperalgesia and is the source of the pronociceptive peptide cholecystokinin in the rostral ventromedial medulla.

    Science.gov (United States)

    Wagner, K M; Roeder, Z; Desrochers, K; Buhler, A V; Heinricher, M M; Cleary, D R

    2013-05-15

    While intense or highly arousing stressors have long been known to suppress pain, relatively mild or chronic stress can enhance pain. The mechanisms underlying stress-induced hyperalgesia (SIH) are only now being defined. The physiological and neuroendocrine effects of mild stress are mediated by the dorsomedial hypothalamus (DMH), which has documented connections with the rostral ventromedial medulla (RVM), a brainstem region capable of facilitating nociception. We hypothesized that stress engages both the DMH and the RVM to produce hyperalgesia. Direct pharmacological activation of the DMH increased sensitivity to mechanical stimulation in awake animals, confirming that the DMH can mediate behavioral hyperalgesia. A behavioral model of mild stress also produced mechanical hyperalgesia, which was blocked by inactivation of either the DMH or the RVM. The neuropeptide cholecystokinin (CCK) acts in the RVM to enhance nociception and is abundant in the DMH. Using a retrograde tracer and immunohistochemical labeling, we determined that CCK-expressing neurons in the DMH are the only significant supraspinal source of CCK in the RVM. However, not all neurons projecting from the DMH to the RVM contained CCK, and microinjection of the CCK2 receptor antagonist YM022 in the RVM did not interfere with SIH, suggesting that transmitters in addition to CCK play a significant role in this connection during acute stress. While the RVM has a well-established role in facilitation of nociception, the DMH, with its well-documented role in stress, may also be engaged in a number of chronic or abnormal pain states. Taken as a whole, these findings establish an anatomical and functional connection between the DMH and RVM by which stress can facilitate pain. Copyright © 2013 IBRO. Published by Elsevier Ltd. All rights reserved.

  1. BLOCKADE OF ROSTRAL VENTROLATERAL MEDULLA (RVLM BOMBESIN RECEPTOR TYPE 1 DECREASES BLOOD PRESSURE AND SYMPATHETIC ACTIVITY IN ANESTHETIZED SPONTANEOUSLY HYPERTENSIVE RATS

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    Izabella Silva De Jesus Pinto

    2016-06-01

    Full Text Available IIntrathecal injection of bombesin (BBS promoted hypertensive and sympathoexcitatory effects in normotensive (NT rats. However, the involvement of rostral ventrolateral medulla (RVLM in these responses is still unclear. In the present study, we investigated: (1 the effects of BBS injected bilaterally into RVLM on cardiorespiratory and sympathetic activity in NT and spontaneously hypertensive rats (SHR; (2 the contribution of RVLM bombesin type 1 receptors (BB1 to the maintenance of hypertension in SHR. Urethane-anesthetized rats (1.2 g · kg−1, i.v. were instrumented to record mean arterial pressure (MAP, diaphragm (DIA motor and renal sympathetic nerve activity (RSNA. In NT rats and SHR, BBS (0.3 mM nanoinjected into RVLM increased MAP (33.9 ± 6.6 mmHg and 37.1 ± 4.5 mmHg, respectively; p < 0.05 and RSNA (97.8 ± 12.9 % and 84.5 ± 18.1 %, respectively; p < 0.05. In SHR, BBS also increased DIA burst amplitude (115.3 ± 22.7 %; p < 0.05. BB1 receptors antagonist (BIM-23127; 3 mM reduced MAP (-19.9 ± 4.4 mmHg; p < 0.05 and RSNA (-17.7 ± 3.8 %; p < 0.05 in SHR, but not in NT rats (-2.5 ± 2.8 mmHg; -2.7 ± 5.6 %, respectively. These results show that BBS can evoke sympathoexcitatory and pressor responses by activating RVLM BB1 receptors. This pathway might be involved in the maintenance of high levels of arterial blood pressure in SHR.

  2. Excitatory amino acid receptor blockade within the caudal pressor area and rostral ventrolateral medulla alters cardiovascular responses to nucleus raphe obscurus stimulation in rats

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    Silva N.F.

    2002-01-01

    Full Text Available Pressor responses elicited by stimulation of the nucleus raphe obscurus (NRO depend on the integrity of the rostral ventrolateral medulla (RVLM. Therefore, to test the participation of excitatory amino acid (EAA receptors in the cardiovascular responses evoked by NRO stimulation (1 ms, 100 Hz, 40-70 µA, for 10 s, the EAA antagonist kynurenic acid (Kyn was microinjected at different sites in the ventrolateral medullar surface (2.7 nmol/200 nl of male Wistar rats (270-320 g, N = 39 and NRO stimulation was repeated. The effects of NRO stimulation were: hypertension (deltaMAP = +43 ± 1 mmHg, P<0.01, bradycardia (deltaHR = -30 ± 7 bpm, P<0.01 and apnea. Bilateral microinjection of Kyn into the RVLM, which did not change baseline parameters, almost abolished the bradycardia induced by NRO stimulation (deltaHR = -61 ± 3 before vs -2 ± 3 bpm after Kyn, P<0.01, N = 7. Unilateral microinjection of Kyn into the CVLM did not change baseline parameters or reduce the pressor response to NRO stimulation (deltaMAP = +46 ± 5 before vs +48 ± 5 mmHg after Kyn, N = 6. Kyn bilaterally microinjected into the caudal pressor area reduced blood pressure and heart rate and almost abolished the pressor response to NRO stimulation (deltaMAP = +46 ± 4 mmHg before vs +4 ± 2 mmHg after Kyn, P<0.01, N = 7. These results indicate that EAA receptors on the medullary ventrolateral surface play a role in the modulation of the cardiovascular responses induced by NRO stimulation, and also suggest that the RVLM participates in the modulation of heart rate responses and that the caudal pressor area modulates the pressor response following NRO stimulation.

  3. Plasma Catecholamines (CA) and Gene Expression of CA Biosynthetic Enzymes in Adrenal Medulla and Sympathetic Ganglia of Rats Exposed to Single or Repeated Hypergravity

    Science.gov (United States)

    Petrak, J.; Jurani, M.; Baranovska, M.; Hapala, I.; Frollo, I.; Kvetnansky, R.

    2008-06-01

    The aim of this study was to evaluate plasma epinephrine (EPI) and norepinephrine (NE) levels in blood collected directly during a single or 8-times repeated centrifugation at hypergravity 4G, using remote controlled equipment. Plasma EPI levels showed a huge hypergravity-induced increase. After the last blood collection during hypergravity, the centrifuge was turned off and another blood sampling was performed immediately after the centrifuge decelerated and stopped (10 min). In these samples plasma EPI showed significantly lower levels compared to centrifugation intervals. Plasma NE levels showed none or small changes. Repeated exposure to hypergravity 4G (8 days for 60 min) eliminated the increase in plasma EPI levels at the 15 min interval but did not markedly affect plasma NE levels. To explain these findings we measured mRNA levels of CA biosynthetic enzymes tyrosine hydroxylase (TH), dopamine-β-hydroxylase (DBH) and phenylethanolamine N-methyltransferase (PNMT) in the adrenal medulla (AM) and stellate ganglia (SG) of rats exposed to continuous hypergravity (2G) up to 6 days. In AM, TH, DBH and PNMT mRNA levels were significantly increased in intervals up to 3 days, however, after 6 day hypergravity exposure, no significant elevation was found. In SG, no significant changes in gene expression of CA enzymes were seen both after a single or repeated hypergravity. Thus, our data show that hypergravity highly activates the adrenomedullary system, whereas the sympathoneural system is not significantly changed. In conclusion, our results demonstrate that during repeated or continuous exposure of the organism to hypergravity the adrenomedullary system is adapted, whereas sympathoneural system is not affected.

  4. Participation of 5-HT and AT1 Receptors within the Rostral Ventrolateral Medulla in the Maintenance of Hypertension in the Goldblatt 1 Kidney-1 Clip Model

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    Cássia T. Bergamaschi

    2014-01-01

    Full Text Available The hypothesis that changes in neurotransmission within the rostral ventrolateral medulla (RVLM are important to maintain the high blood pressure (BP was tested in Goldblatt one kidney-one clip hypertension model (1K-1C. Male Wistar rats were anesthetized (urethane 1.2 g/kg, i.v., and the effects of bilateral microinjections into the RVLM of the following drugs were measured in 1K-1C or control groups: glutamate (0.1 mol/L, 100 nL and its antagonist kynurenic acid (0.02 mol/L, 100 nL, the angiotensin AT1 receptor antagonist candesartan (0.01 mol/L, 100 nL, and the nonselective 5-HT receptor antagonist methiothepin (0.06 mol/L, 100 nL. Experiments in 1K-1C rats were performed 6 weeks after surgery. In anesthetized rats glutamate response was larger in hypertensive than in normotensive rats (H: Δ67±6.5; N: Δ43±3.54 mmHg. In contrast, kynurenic acid microinjection into the RVLM did not cause any change in BP in either group. The blockade of either AT1 or 5-HT receptors within the RVLM decreased BP only in 1K-1C rats. A largest depressor response was caused by 5-HT receptor blockade. The data suggest that 5-HT and AT1 receptors act tonically to drive RVLM in 1K-1C rats, and these actions within RVLM contribute to the pathogenesis of this model of hypertension.

  5. Sympathoinhibitory effects of telmisartan through the reduction of oxidative stress in the rostral ventrolateral medulla of obesity-induced hypertensive rats.

    Science.gov (United States)

    Konno, Satomi; Hirooka, Yoshitaka; Kishi, Takuya; Sunagawa, Kenji

    2012-10-01

    Sympathetic nervous system (SNS) activity is critically involved in the development and progression of obesity-induced hypertension. Angiotensin II type 1 receptor (AT1R)-induced oxidative stress in the rostral ventrolateral medulla (RVLM), a vasomotor center in the brainstem, activates the SNS in hypertensive rats. The aim of the present study was to determine whether oral administration of an AT1R blocker (ARB) inhibits SNS activity via antioxidative effects in the RVLM of rats with dietary-induced obesity. Obesity-prone rats fed a high-fat diet were divided into groups treated with either telmisartan obesity-prone (TLM-OP), or losartan obesity-prone (LOS-OP), or vehicle obesity-prone (VEH-OP). SBP, SNS activity, and oxidative stress in the RVLM were significantly higher in obesity-prone rats than in obesity-resistant rats. Body weight, visceral fat, blood glucose, serum insulin, and plasma adiponectin concentrations were significantly lower in TLM-OP and LOS-OP than in VEH-OP, and plasma adiponectin concentrations were significantly higher in TLM-OP than in LOS-OP. Although SBP was reduced to similar levels both in TLM-OP and LOS-OP, both oxidative stress in the RVLM and SNS activity were significantly lower in TLM-OP than in LOS-OP or VEH-OP. Orally administered telmisartan inhibited SNS activity through antioxidative effects via AT1R blockade in the RVLM of obesity-prone rats. AT1R and oxidative stress in the RVLM might be novel treatment targets for obesity-induced hypertension through sympathoinhibition, and telmisartan might be preferable for obesity-induced hypertension.

  6. Role of genetic polymorphisms of CYP1A1, CYP3A5, CYP2C9, CYP2D6, and PON1 in the modulation of DNA damage in workers occupationally exposed to organophosphate pesticides

    Energy Technology Data Exchange (ETDEWEB)

    Singh, Satyender [Division of Biochemistry and Biotechnology, National Centre for Disease Control 22, Sham Nath Marg, Delhi-110054 (India); Kumar, Vivek [Environmental Biochemistry and Molecular Biology laboratory, Department of Biochemistry, University College of Medical Sciences and GTB Hospital, University of Delhi, Dilshad Garden, Delhi-110095 (India); Vashisht, Kapil; Singh, Priyanka [Division of Biochemistry and Biotechnology, National Centre for Disease Control 22, Sham Nath Marg, Delhi-110054 (India); Banerjee, Basu Dev, E-mail: banerjeebd@hotmail.com [Environmental Biochemistry and Molecular Biology laboratory, Department of Biochemistry, University College of Medical Sciences and GTB Hospital, University of Delhi, Dilshad Garden, Delhi-110095 (India); Rautela, Rajender Singh; Grover, Shyam Sunder; Rawat, Devendra Singh; Pasha, Syed Tazeen [Division of Biochemistry and Biotechnology, National Centre for Disease Control 22, Sham Nath Marg, Delhi-110054 (India); Jain, Sudhir Kumar [Centre for Epidemiology and Parasitic Diseases, National Centre for Disease Control 22, Sham Nath Marg, Delhi-110054 (India); Rai, Arvind [Division of Biochemistry and Biotechnology, National Centre for Disease Control 22, Sham Nath Marg, Delhi-110054 (India)

    2011-11-15

    Organophosphate pesticides (OPs) are primarily metabolized by several xenobiotic metabolizing enzymes (XMEs). Very few studies have explored genetic polymorphisms of XMEs and their association with DNA damage in pesticide-exposed workers. The present study was designed to determine the role of genetic polymorphisms of CYP1A1, CYP3A5, CYP2C9, CYP2D6, and PON1 in the modulation of DNA damage in workers occupationally exposed to OPs. We examined 284 subjects including 150 workers occupationally exposed to OPs and 134 normal healthy controls. The DNA damage was evaluated using the alkaline comet assay and genotyping was done using PCR-RFLP. The results revealed that the PONase activity toward paraoxonase and AChE activity was found significantly lowered in workers as compared to control subjects (p < 0.001). Workers showed significantly higher DNA damage compared to control subjects (14.37 {+-} 2.15 vs. 6.24 {+-} 1.37 tail% DNA, p < 0.001). Further, the workers with CYP2D6*3 PM and PON1 (QQ and MM) genotypes were found to have significantly higher DNA damage when compared to other genotypes (p < 0.05). In addition, significant increase in DNA damage was also observed in workers with concomitant presence of certain CYP2D6 and PON1 (Q192R and L55M) genotypes which need further extensive studies. In conclusion, the results indicate that the PON1 and CYP2D6 genotypes can modulate DNA damage elicited by some OPs possibly through gene-environment interactions. -- Highlights: Black-Right-Pointing-Pointer Role of CYP1A1, CYP3A5, CYP2C, CYP2D6 and PON1 genotypes on DNA damage. Black-Right-Pointing-Pointer Workers exposed to some OPs demonstrated increased DNA damage. Black-Right-Pointing-Pointer CYP2D6 *3 PM and PON1 (Q192R and L55M) genotypes are associated with DNA damage. Black-Right-Pointing-Pointer Concomitant presence of certain CYP2D6 and PON1 genotypes can increase DNA damage.

  7. On-the-field performance of quintuple-play long-reach OFDM-based WDM-PON optical access networks.

    Science.gov (United States)

    Llorente, Roberto; Morant, Maria; Pellicer, Eloy; Herman, Milan; Nagy, Zsolt; Alves, Tiago; Cartaxo, Adolfo; Herrera, Javier; Correcher, Jose; Quinlan, Terence; Walker, Stuart; Rodrigues, Cláudio; Cluzeaud, Pierre; Schmidt, Axel; Piesiewicz, Radoslaw; Sambaraju, Rakesh

    2014-03-24

    In this paper the on-the-field performance of a WDM-PON optical access providing quintuple-play services using orthogonal frequency division multiplexing (OFDM) modulation is evaluated in a real fiber-to-the-home (FTTH) network deployed by Towercom operator in Bratislava (Slovakia). A bundle of quintuple-play services comprising full-standard OFDM-based signals (LTE, WiMAX, UWB and DVB-T) and an ad-hoc OFDM-GbE signal is transmitted in coexistence per single user. Both downstream and upstream transmission performances are evaluated in different on-the-field long-reach optical link distance configurations. Four wavelength multi-user transmission of quintuple-play OFDM services is demonstrated exceeding 60.8 km reach in standard single mode fiber.

  8. Bruno Crépon, Gérard Van den Berg, Politiques de l’emploi. Apprendre de l’expérience

    OpenAIRE

    Couëtoux, Jean-Edouard

    2017-01-01

    Évaluer l’efficacité des politiques actives de l’emploi apparaît comme un enjeu économique et démocratique central à l’heure où le taux de chômage s’établit en France à 10,2% et où le pays consacre 0,7% de son PIB aux politiques actives de l’emploi, même si les revenus de remplacement demeurent la principale dépense liée au chômage. Bruno Crépon, économiste au Centre de recherches en économie et statistique (CREST) et professeur à l’École nationale de la statistique et de l’administration éco...

  9. Association of PON1, P2Y12 and COX1 with Recurrent Ischemic Events in Patients with Extracranial or Intracranial Stenting.

    Directory of Open Access Journals (Sweden)

    Xiao-Qing Li

    Full Text Available Short-term combined use of clopidogrel and aspirin improves cerebrovascular outcomes in patients with symptomatic extracranial or intracranial stenosis. Antiplatelet non-responsiveness is related to recurrent ischemic events, but the culprit genetic variants responsible for the non-responsiveness have not been well studied. We aimed to identify the genetic variants associated with poor clinical outcomes.Patients with symptomatic extracranial or intracranial stenosis scheduled for stenting and receiving dual antiplatelets (clopidogrel 75 mg and aspirin 100 mg daily for at least 5 days before intervention were enrolled. Ischemic events including recurrent transient ischemic attack, stroke, myocardial infarction, and vascular-related mortality within 12 months follow-up were recorded. We examined the influence of genetic polymorphisms on treatment outcome in our patients.A total of 268 patients were enrolled into our study and ischemic events were observed in 39 patients. For rs662 of paraoxonase 1 (PON1, allele C was associated with an increased risk of ischemic events (OR = 1.64, 95%CI = 1.03-2.62, P = 0.029. The A-allele carriers of rs2046934 of P2Y12 had a significant association with adverse events (OR = 2.01, 95%CI = 1.10-3.67, P = 0.041. The variant T-allele of cyclooxygenase-1 (COX1 rs1330344 significantly increased the risk of recurrent clinical events (OR = 1.85, 95%CI = 1.12-3.03, P = 0.017. The other single nucleotide polymorphism (SNP had no association with ischemic events.PON1, P2Y12 and COX1 polymorphisms were associated with poorer vascular outcomes. Testing for these polymorphisms may be valuable in the identification of patients at risk for recurrent ischemic events.

  10. Symmetric 40-Gb/s TWDM-PON with 51-dB loss budget by using a single SOA as preamplifier, booster and format converter in ONU.

    Science.gov (United States)

    Li, Zhengxuan; Yi, Lilin; Hu, Weisheng

    2014-10-06

    In this paper, we propose to use a semiconductor optical amplifier (SOA) in the optical network unit (ONU) to improve the loss budget in time and wavelength division multiplexed-passive optical network (TWDM-PON) systems. The SOA boosts the upstream signal to increase the output power of the electro-absorption modulated laser (EML) and simultaneously pre-amplifies the downstream signal for sensitivity improvement. The penalty caused by cross gain modulation (XGM) effect is negligible due to the low extinction ratio (ER) of upstream signal and the large wavelength difference between upstream and downstream links. In order to achieve a higher output power, the SOA is driven into its saturation region, where the self-phase modulation (SPM) effect converts the intensity into phase information and realizes on-off-keying (OOK) to phase-shifted-keying (PSK) format conversion. In this way, the pattern effect is eliminated, which releases the requirement of gain-clamping on SOA. To further improve the loss budget of upstream link, an Erbium doped fiber amplifier (EDFA) is used in the optical line terminal (OLT) to pre-amplify the received signal. For the downstream direction, directly modulated laser (DML) is used as the laser source. Taking advantage of its carrier-less characteristic, directly modulated signal shows high tolerance to fiber nonlinearity, which could support a downstream launch power as high as + 16 dBm per channel. In addition, the signal is pre-amplified by the SOA in ONU before being detected, so the sensitivity limitation for downstream link is also removed. As a result, a truly passive symmetric 40-Gb/s TWDM-PON was demonstrated, achieving a link loss budget of 51 dB.

  11. Heme oxygenase-1 plays a pro-life role in experimental brain stem death via nitric oxide synthase I/protein kinase G signaling at rostral ventrolateral medulla

    Directory of Open Access Journals (Sweden)

    Dai Kuang-Yu

    2010-09-01

    Full Text Available Abstract Background Despite its clinical importance, a dearth of information exists on the cellular and molecular mechanisms that underpin brain stem death. A suitable neural substrate for mechanistic delineation on brain stem death resides in the rostral ventrolateral medulla (RVLM because it is the origin of a life-and-death signal that sequentially increases (pro-life and decreases (pro-death to reflect the advancing central cardiovascular regulatory dysfunction during the progression towards brain stem death in critically ill patients. The present study evaluated the hypothesis that heme oxygnase-1 (HO-1 may play a pro-life role as an interposing signal between hypoxia-inducible factor-1 (HIF-1 and nitric oxide synthase I (NOS I/protein kinase G (PKG cascade in RVLM, which sustains central cardiovascular regulatory functions during brain stem death. Methods We performed cardiovascular, pharmacological, biochemical and confocal microscopy experiments in conjunction with an experimental model of brain stem death that employed microinjection of the organophosphate insecticide mevinphos (Mev; 10 nmol bilaterally into RVLM of adult male Sprague-Dawley rats. Results Western blot analysis coupled with laser scanning confocal microscopy revealed that augmented HO-1 expression that was confined to the cytoplasm of RVLM neurons occurred preferentially during the pro-life phase of experimental brain stem death and was antagonized by immunoneutralization of HIF-1α or HIF-1β in RVLM. On the other hand, the cytoplasmic presence of HO-2 in RVLM neurons manifested insignificant changes during both phases. Furthermore, immunoneutralization of HO-1 or knockdown of ho-1 gene in RVLM blunted the augmented life-and-death signals exhibited during the pro-life phase. Those pretreatments also blocked the upregulated pro-life NOS I/PKG signaling without affecting the pro-death NOS II/peroxynitrite cascade in RVLM. Conclusions We conclude that transcriptional

  12. The intermedius nucleus of the medulla: a potential site for the integration of cervical information and the generation of autonomic responses.

    Science.gov (United States)

    Edwards, Ian J; Deuchars, Susan A; Deuchars, Jim

    2009-11-01

    The intermedius nucleus of the medulla (InM) is a small perihypoglossal brainstem nucleus, which receives afferent information from the neck musculature and also descending inputs from the vestibular nuclei, the gustatory portion of the nucleus of the solitary tract (NTS) and cortical areas involved in movements of the tongue. The InM sends monosynaptic projections to both the NTS and the hypoglossal nucleus. It is likely that the InM acts to integrate information from the head and neck and relays this information on to the NTS where suitable autonomic responses can be generated, and also to the hypoglossal nucleus to influence movements of the tongue and upper airways. Central to the integratory role of the InM is its neurochemical diversity. Neurones within the InM utilise the amino acid transmitters glutamate, GABA and glycine. A proportion of these excitatory and inhibitory neurones also use nitric oxide as a neurotransmitter. Peptidergic transmitters have also been found within InM neurones, although as yet the extent of the pattern of co-localisation between peptidergic and amino acid transmitters in neurones has not been established. The calcium binding proteins calretinin and parvalbumin are found within the InM in partially overlapping populations. Parvalbumin and calretinin appear to have complementary distributions within the InM, with parvalbumin being predominantly found within GABAergic neurones and calretinin being predominantly found within glutamatergic neurones. Neurones in the InM receive inputs from glutamatergic sensory afferents. This glutamatergic transmission is conducted through both NMDA and AMPA ionotropic glutamate receptors. In summary the InM contains a mixed pool of neurones including glutamatergic and GABAergic in addition to peptidergic neurones. Neurones within the InM receive inputs from the upper cervical region, descending inputs from brain regions involved in tongue movements and those involved in the coordination of the

  13. Anatomy and discharge properties of pre-motor neurons in the goldfish medulla that have eye-position signals during fixations.

    Science.gov (United States)

    Aksay, E; Baker, R; Seung, H S; Tank, D W

    2000-08-01

    Previous work in goldfish has suggested that the oculomotor velocity-to-position neural integrator for horizontal eye movements may be confined bilaterally to a distinct group of medullary neurons that show an eye-position signal. To establish this localization, the anatomy and discharge properties of these position neurons were characterized with single-cell Neurobiotin labeling and extracellular recording in awake goldfish while monitoring eye movements with the scleral search-coil method. All labeled somata (n = 9) were identified within a region of a medially located column of the inferior reticular formation that was approximately 350 microm in length, approximately 250 microm in depth, and approximately 125 microm in width. The dendrites of position neurons arborized over a wide extent of the ventral half of the medulla with especially heavy ramification in the initial 500 microm rostral of cell somata (n = 9). The axons either followed a well-defined ventral pathway toward the ipsilateral abducens (n = 4) or crossed the midline (n = 2) and projected toward the contralateral group of position neurons and the contralateral abducens. A mapping of the somatic region using extracellular single unit recording revealed that position neurons (n > 120) were the dominant eye-movement-related cell type in this area. Position neurons did not discharge below a threshold value of horizontal fixation position of the ipsilateral eye. Above this threshold, firing rates increased linearly with increasing temporal position [mean position sensitivity = 2.8 (spikes/s)/ degrees, n = 44]. For a given fixation position, average rates of firing were higher after a temporal saccade than a nasal one (n = 19/19); the magnitude of this hysteresis increased with increasing position sensitivity. Transitions in firing rate accompanying temporal saccades were overshooting (n = 43/44), beginning, on average, 17.2 ms before saccade onset (n = 17). Peak firing rate change accompanying temporal

  14. Simultaneous generation of independent wired and 60-GHz wireless signals in an integrated WDM-PON-RoF system based on frequency-sextupling and OCS-DPSK modulation.

    Science.gov (United States)

    Zhang, Liang; Hu, Xiaofeng; Cao, Pan; Chang, Qingjiang; Su, Yikai

    2012-06-18

    We propose a simple and cost-effective scheme to integrate a wavelength division multiplexed-passive optical network (WDM-PON) with a 60-GHz radio-over-fiber (RoF) system. In optical line terminal/central station (OLT/CS), 10-GHz electronic devices and single-drive Mach-Zehnder modulators (MZMs) are used to generate 60-GHz wireless signals based on frequency-sextupling and optical carrier suppression-differential phase shift keying (OCS-DPSK) modulation. By designing a new architecture, only N + 1 single-drive MZMs are required for an N-channel WDM-PON-RoF converged system. The proposed scheme is experimentally demonstrated with 1.25-Gb/s independent wired, wireless and upstream data. Error-free performances are achieved for all these signals after transmission of 25-km single mode fiber (SMF).

  15. Personality and social skills in human-dog interaction

    DEFF Research Database (Denmark)

    Meyer, Iben Helene Coakley

    Dogs have been part of human life for many thousands years, with the dog most likely being the first animal to be domesticated by humans. The dog as a species has had an enormous success in the human world, and research suggests that a co-evolution of humans and dogs has resulted in the dog......-questionnaire measures humans’ emotional empathy for animals, and is based on a human-oriented empathy scale. It was investigated how em-pathy for animals affects human interpretation of dog behaviour watched on video. The PONS test measures the ability to interpret human nonverbal communication and its reliability...... differed between breeds. Human social skills were shown to be associated with the interpretation of dog behaviour as well as the quality of human-dog interaction. Lower levels of empathy for animals were associated with interpreting the behaviour of dogs as more aggressive. In human-dog greeting...

  16. Human valacyclovir hydrolase/biphenyl hydrolase-like protein is a highly efficient homocysteine thiolactonase.

    Directory of Open Access Journals (Sweden)

    Judit Marsillach

    Full Text Available Homocysteinylation of lysine residues by homocysteine thiolactone (HCTL, a reactive homocysteine metabolite, results in protein aggregation and malfunction, and is a well-known risk factor for cardiovascular, autoimmune and neurological diseases. Human plasma paraoxonase-1 (PON1 and bleomycin hydrolase (Blmh have been reported as the physiological HCTL detoxifying enzymes. However, the catalytic efficiency of HCTL hydrolysis by Blmh is low and not saturated at 20 mM HCTL. The catalytic efficiency of PON1 for HCTL hydrolysis is 100-fold lower than that of Blmh. A homocysteine thiolactonase (HCTLase was purified from human liver and identified by mass spectrometry (MS as the previously described human biphenyl hydrolase-like protein (BPHL. To further characterize this newly described HCTLase activity, BPHL was expressed in Escherichia coli and purified. The sequence of the recombinant BPHL (rBPHL and hydrolytic products of the substrates HCTL and valacyclovir were verified by MS. We found that the catalytic efficiency (kcat/Km of rBPHL for HCTL hydrolysis was 7.7 × 10(4 M(-1s(-1, orders of magnitude higher than that of PON1 or Blmh, indicating a more significant physiological role for BPHL in detoxifying HCTL.

  17. Interneurons and proprioneurons in the adult human spinal grey matter and in the general somatic and visceral afferent cranial nerve nuclei.

    OpenAIRE

    Abdel-Maguid, T E; Bowsher, D

    1984-01-01

    Using the classification of Abdel-Maguid & Bowsher (1984), interneurons of the dorsal horn of the grey matter of the human spinal cord and medulla oblongata were found to belong to only three 'families' of neurons, out of a possible thirteen. This is in itself one of the justifications for the method of classification. Functional identification of these human neurons has been made on the basis of topological, morphological and projectional comparison with known cells in other mammalian specie...

  18. Immunofluorescent localization of Tamm-Horsfall mucoprotein in human kidney

    Science.gov (United States)

    McKenzie, J. K.; McQueen, E. G.

    1969-01-01

    A fluorescein-labelled antiserum to human Tamm-Horsfall mucoprotein applied to frozen human kidney sections gave strong specific labelling, mainly of cells of tubules in the outer medulla. By comparison with adjacent serial sections stained for alkaline phosphatase and succinic dehydrogenase, it is suggested that material reacting immunologically as Tamm-Horsfall muco-protein is found particularly in the cells of the ascending limb of the loop of Henle and the macula densa segment of the distal tubule. Images PMID:4891482

  19. Inhibition of Na(+),K(+)-ATPase in the hypothalamus, pons and cerebellum of the offspring rat due to experimentally-induced maternal hypothyroidism.

    Science.gov (United States)

    Koromilas, Christos; Liapi, Charis; Zarros, Apostolos; Tsela, Smaragda; Zissis, Konstantinos M; Kalafatakis, Konstantinos; Skandali, Nikolina; Voumvourakis, Konstantinos; Carageorgiou, Haris; Tsakiris, Stylianos

    2015-08-01

    Neurodevelopment is known to be particularly susceptible to thyroid hormone insufficiency and can result in extensive structural and functional deficits within the central nervous system (CNS), subsequently leading to the establishment of cognitive impairment and neuropsychiatric symptomatology. The current study evaluated the effects of gestational and/or lactational maternal exposure to propylthiouracil (PTU)-induced hypothyroidism (as a suggestive multilevel experimental approach to the study of hypothyroidism-induced changes that has been developed and characterized by the authors) on crucial brain enzyme activities of 21-day-old Wistar rat offspring in a CNS region-specific manner. The activities of acetylcholinesterase (AChE), Na(+),K(+)-ATPase and Mg(2+)-ATPase in the offspring hypothalamus, cerebellum and pons were assessed. The study demonstrated that maternal exposure to PTU (0.05% w/v in the drinking water) during the critical periods of neurodevelopment can result in an inhibition of hypothalamic, pontine and cerebellar Na(+),K(+)-ATPase; a major marker of neuronal excitability and metabolic energy production as well as an important regulator of important systems of neurotransmission. On the other hand, no significant changes in the activities of the herein offspring CNS regions' AChE and Mg(2+)-ATPase were recorded. The observed Na(+),K(+)-ATPase inhibition: (i) is region-specific (and non-detectable in whole brain homogenetes), (ii) could constitute a central event in the pathophysiology of clinically-relevant hypothyroidism-associated developmental neurotoxicity, (iii) occurs under all examined experimental schemes, and (iv) certainly deserves further clarification at a molecular and histopathological level. As these findings are analyzed and compared to the available literature, they also underline the need for the adoption and further study of Na(+),K(+)-ATPase activity as a consistent neurochemical marker within the context of a systematic

  20. Transcriptional up-regulation of nitric oxide synthase II by nuclear factor-κB at rostral ventrolateral medulla in a rat mevinphos intoxication model of brain stem death

    Science.gov (United States)

    Chan, Julie Y H; Wu, Carol H Y; Tsai, Ching-Yi; Cheng, Hsiao-Lei; Dai, Kuang-Yu; Chan, Samuel H H; Chang, Alice Y W

    2007-01-01

    As the origin of a ‘life-and-death’ signal that reflects central cardiovascular regulatory failure during brain stem death, the rostral ventrolateral medulla (RVLM) is a suitable neural substrate for mechanistic delineation of this vital phenomenon. Using a clinically relevant animal model that employed the organophosphate pesticide mevinphos (Mev) as the experimental insult, we evaluated the hypothesis that transcriptional up-regulation of nitric oxide synthase I or II (NOS I or II) gene expression by nuclear factor-κB (NF-κB) on activation of muscarinic receptors in the RVLM underlies brain stem death. In Sprague-Dawley rats maintained under propofol anaesthesia, co-microinjection of muscarinic M2R (methoctramine) or M4R (tropicamide), but not M1R (pirenzepine) or M3R (4-diphenylacetoxy-N-dimethylpiperidinium) antagonist significantly reduced the enhanced NOS I–protein kinase G signalling (‘pro-life’ phase) or augmented NOS II–peroxynitrite cascade (‘pro-death’ phase) in ventrolateral medulla, blunted the biphasic increase and decrease in baroreceptor reflex-mediated sympathetic vasomotor tone that reflect the transition from life to death, and diminished the elevated DNA binding activity or nucleus-bound translocation of NF-κB in RVLM neurons induced by microinjection of Mev into the bilateral RVLM. However, NF-κB inhibitors (diethyldithiocarbamate or pyrrolidine dithiocarbamate) or double-stranded κB decoy DNA preferentially antagonized the augmented NOS II–peroxynitrite cascade and the associated cardiovascular depression exhibited during the ‘pro-death’ phase. We conclude that transcriptional up-regulation of NOS II gene expression by activation of NF-κB on selective stimulation of muscarinic M2 or M4 subtype receptors in the RVLM underlies the elicited cardiovascular depression during the ‘pro-death’ phase in our Mev intoxication model of brain stem death. PMID:17395621

  1. 1.92 Tb/s coherent DWDM-OFDMA-PON with no high-speed ONU-side electronics over 100 km SSMF and 1:64 passive split.

    Science.gov (United States)

    Cvijetic, Neda; Huang, Ming-Fang; Ip, Ezra; Shao, Yin; Huang, Yue-Kai; Cvijetic, Milorad; Wang, Ting

    2011-11-21

    Record 1.92-Tb/s (40λ × 48 Gb/s/λ) coherent DWDM-OFDMA-PON without high-speed ONU-side ADCs/DACs/DSP/RF clock sources is demonstrated over 100 km straight SSMF with a 1:64 passive split. Novel optical-domain OFDMA sub-band selection, coherent detection, and simple RF components are exploited. As the first experimental verification of a next-generation optical platform capable of delivering 1 Gb/s to 1000(+) users over 100 km, the new architecture is promising for future optical access/metro systems. © 2011 Optical Society of America

  2. The association of the PON1 Q192R polymorphism with coronary heart disease: findings from the British Women's Heart and Health cohort study and a meta-analysis

    Directory of Open Access Journals (Sweden)

    Kiessling Matthew

    2004-06-01

    Full Text Available Abstract Background There have been inconsistent results from case-control studies assessing the association of the PON1 Q192R polymorphism with coronary heart disease (CHD. Most studies have included predominantly men and the association in women is unclear. Since lipid levels vary between the sexes the antioxidant effect of PON1 and any genes associated with it may also vary by sex. We have examined the association of the PON1 Q192R polymorphism with CHD in a large cohort of British women and combined the results from our cohort study with those from all other published studies. Results The distribution of genotypes was the same among women with CHD and those without disease. The odds ratio (95% confidence interval of having CHD comparing those with either the QR or RR genotype to those with QQ genotype (dominant model of association was 1.03 (0.89, 1.21 and the per allele odds ratio was 0.98 (0.95, 1.01. In a meta-analysis of this and 38 other published studies (10,738 cases and 17,068 controls the pooled odds ratio for the dominant effect was 1.14 (1.08, 1.20 and for the per allele effect was 1.10 (1.06, 1.13. There was evidence of small study bias in the meta-analyses and the dominant effect among those studies with 500 or more cases was 1.05 (0.96, 1.15. Ethnicity and reporting of whether the genotyping was done blind to the participants clinical status also contributed to heterogeneity between studies, but there was no difference in effect between studies with 50% or more women compared to those with fewer women and no difference between studies of healthy populations compared to those at high risk (with diabetes, renal disease of familial hypercholesterolaemia. Conclusion There is no robust evidence that the PON1 Q192R polymorphism is associated with CHD risk in Caucasian women or men.

  3. Radiation necrosis of the optic chiasm, optic tract, hypothalamus, and upper pons after radiotherapy for pituitary adenoma, detected by gadolinium-enhanced, T1-weighted magnetic resonance imaging: Case report

    Energy Technology Data Exchange (ETDEWEB)

    Tachibana, O.; Yamaguchi, N.; Yamashima, T.; Yamashita, J. (Univ. of Kanazawa School of Medicine (Japan))

    1990-10-01

    A 26-year-old woman was treated for a prolactin secreting pituitary adenoma by surgery and radiotherapy (5860 rads). Fourteen months later, she developed right hemiparesis and dysarthria. A T1-weighted magnetic resonance imaging scan using gadolinium contrast showed a small, enhanced lesion in the upper pons. Seven months later, she had a sudden onset of loss of vision, and radiation optic neuropathy was diagnosed. A T1-weighted magnetic resonance imaging scan showed widespread gadolinium-enhanced lesions in the optic chiasm, optic tract, and hypothalamus. Magnetic resonance imaging is indispensable for the early diagnosis of radiation necrosis, which is not visualized by radiography or computed tomography.

  4. El compositor Josep Pons i el llenguatge musical per a la litúrgia de l'ordinarium: "Missa a 4 ÿ a 8 con oboes, violines ÿ trompas sobre l'antífona Ecce Sacerdos Magnus" (1786)

    OpenAIRE

    Ramírez Beneyto, Ramón

    2004-01-01

    RESUM L'autor divideix la present tesi en dos grans blocs: el primer dedicat als aspectes històrics, en els quals s'emmarca la figura del personatge estudiat i el segon atenent específicament als aspectes purament tècnics del seu llenguatge musical, mitjançant lestudi de l'obra recuperada. En la primera part es planteja una aproximació a la figura del mestre Pons a partir de la reconstrucció del seu periple vital, des que nasquera a Girona en 1.770 fins que es va produir ...

  5. Medline Plus

    Full Text Available ... capacity to remember numerous pieces of information. The 3 major components of the brain are the cerebrum, ... with the spinal cord and is composed of 3 structures: the midbrain, pons, and medulla oblongata. The ...

  6. Development of the brain stem in the rat. II. Thymidine-radiographic study of the time of origin of neurons of the upper medulla, excluding the vestibular and auditory nuclei.

    Science.gov (United States)

    Altman, J; Bayer, S A

    1980-11-01

    Groups of pregnant rats were injected with two successive daily doses of 3H-thymidine from gestational days 12 and 13 (E12 + 13) until the day before birth (E21 + 22). In radiographs from adult progeny of these rats the proportion of neurons generated on specific days was determined in the major nuclei of the upper medulla, with the exception of the vestibular and auditory nuclei. The neurons of the motor nuclei are generated over a brief period. Neurons of the retrofacial nucleus are produced first, with more than 60% of the cells arising on day E11 or earlier. Peak generation time of abducens neurons is day E12 and of the neurons of the facial nucleus is day E13. In contrast, the neurons of the superior salivatory nucleus are produced late, predominantly on day E15 and some on day E16. The generation of the (sensory relay) neurons of the nucleus oralis of the trigeminal complex takes place over an extended period between days E12 and E15; the last generated cells include the largest neurons of this nucleus. Neurons of the raphe magnus are produced between days E11 and E14, the neurons of the rostral medullary reticular formation between days E12 and E15. The latest generated neurons of the upper medulla (excluding the cochlear nuclei) belong to a structure identified as the granular layer of the raphe. Combining these results with those of the preceding paper (Altman and Bayer, '80a) and with additional data, it is postulated that the laterally and ventrally situated motor nucleus of the trigeminal, the facial nucleus, and the nucleus ambiguous form a single longitudinal zone of branchial motor neurons with a rostral-to-caudal cytogenetic gradient. In contrast, the medially and dorsally situated (juxtaventricular) hypoglossal nucleus and abducens nucleus (together with the other nuclei of the ocular muscles) form a longitudinal somatic motor zone with a caudal-to-rostral gradient. The dorsal nucleus of the vagus and the superior salivatory nucleus may constitute

  7. [Effect of Acupuncture at "Taichong"(LR 3) and "Neiguan"(PC 6) on Blood Pressure and Contents of Aspartic Acid and Glutamic Acid in the Rostral Ventrolateral Medulla in Spontaneous Hypertension Rats].

    Science.gov (United States)

    Shen, Pan-Pan; Chen, Yue-Ting; Xiao, Shuang-Kai; Yao, Wen; Yang, Ya-Yuan; Lin, Xian-Ming

    2017-04-25

    To explore the potential mechanism of acupuncture stimulation of "Taichong" (LR 3) and "Neiguan" (PC 6) in spontaneous hypertension rats (SHR) by investigating its effects on blood pressure and contents of aspartic acid(Asp) and glutamic acid (Glu) in the rostral ventrolateral medulla (RVLM) region. A total of 75 SHR were randomized into model group, Taichong (LR 3) group, Neiguan (PC 6) group, LR 3+non-acupoint group and LR 3 + PC 6 group (n=15 rats in each group), and 15 Wistar rats of the same age were used as the normal control group. The filiform needles were inserted into the abovementioned acupoints and non-acupoint, twirled for a while and then retained for 30 min. The treatment was conducted once per day, 15 times in total. The rats' tail blood pressure was examined on day 1, 3, 7 and 15 after acupuncture treatment by using a non-invasive blood pressure monitor. At the end of experiment, the contents of Asp and Glu in the RVLM were detected by high-performance liquid chromatography with UV technique. On day 1, 3, 7 and 15 after the acupuncture treatment, the raised systolic blood pressure (SBP), diastolic blood pressure (DBP) and mean arterial blood pressure (MBP) of PC 6, LR 3, LR 3 + non-acupoint and LR 3 + PC 6 groups were all decreased significantly compared with the model group (Pblood pressure in spontaneous hypertension rats, which may be associated with its effects in lowering Asp and Glu contents in RVLM.

  8. Localization of the noradrenaline transporter in rat adrenal medulla and PC12 cells: evidence for its association with secretory granules in PC12 cells.

    Science.gov (United States)

    Kippenberger, A G; Palmer, D J; Comer, A M; Lipski, J; Burton, L D; Christie, D L

    1999-09-01

    The noradrenaline transporter (NAT) is present in noradrenergic neurons and a few other specialized cells such as adrenal medullary chromaffin cells and the rat pheochromocytoma (PC12) cell line. We have raised antibodies to a 49-residue segment (NATM2) of the extracellular region (residues 184-232) of bovine NAT. Affinity-purified NATM2 antibodies specifically recognized an 80-kDa band in PC12 cell membranes by western blotting. Bands of a similar size were also detected in membranes from human neuroblastoma (SK-N-SH) cells expressing endogenous NAT and human embryonic kidney (HEK293) cells stably expressing bovine NAT. Immunocytochemistry of rat adrenal tissue showed that NAT staining was colocalized with tyrosine hydroxylase in medullary chromaffin cells. Most NAT immunoreactivity in rat adrenal chromaffin and PC12 cells was present in the cytoplasm and had a punctate appearance. Cell surface biotinylation experiments in PC12 cells confirmed that only a minor fraction of the NAT was present at the cell surface. Subcellular fractionation of PC12 cells showed that relatively little NAT colocalized with plasma membrane, synaptic-like microvesicles, recycling endosomes, or trans-Golgi vesicles. Most of the NAT was associated with [3H]noradrenaline-containing secretory granules. Following nerve growth factor treatment, NAT was localized to the growing tip of neurites. This distribution was similar to the secretory granule marker secretogranin I. We conclude that the majority of NAT is present intracellularly in secretory granules and suggest that NAT may undergo regulated trafficking in PC12 cells.

  9. Bariatric surgery improves lipoprotein profile in morbidly obese patients by reducing LDL cholesterol, apoB, and SAA/PON1 ratio, increasing HDL cholesterol, but has no effect on cholesterol efflux capacity.

    Science.gov (United States)

    Kjellmo, Christian Abendstein; Karlsson, Helen; Nestvold, Torunn K; Ljunggren, Stefan; Cederbrant, Karin; Marcusson-Ståhl, Maritha; Mathisen, Monica; Lappegård, Knut Tore; Hovland, Anders

    2017-11-08

    Bariatric surgery has been shown to reduce cardiovascular events and cause-specific mortality for coronary artery disease in obese patients. Lipoprotein biomarkers relating to low-density lipoprotein (LDL), high-density lipoprotein (HDL), their subfractions, and macrophage cholesterol efflux have all been hypothesized to be of value in cardiovascular risk assessment. The objective of this study was to examine the effect of a lifestyle intervention followed by bariatric surgery on the lipid profile of morbidly obese patients. Thirty-four morbidly obese patients were evaluated before and after lifestyle changes and then 1 year after bariatric surgery. They were compared with 17 lean subjects. Several lipoprotein metrics, serum amyloid A (SAA), serum paraoxonase-1 (PON1), and macrophage cholesterol efflux capacity (CEC) were assessed. Average weight loss after the lifestyle intervention was 10.5% and 1 year after bariatric surgery was 33.9%. The lifestyle intervention significantly decreased triglycerides (TGs; -28.7 mg/dL, P < .05), LDL cholesterol (LDL-C; -32.3 mg/dL, P < .0001), and apolipoprotein B (apoB; -62.9 μg/mL, P < .001). Bariatric surgery further reduced TGs (-36.7 mg/dL, P < .05), increased HDL cholesterol (+12 mg/dL, P < .0001), and reductions in LDL-C and apoB were sustained. Bariatric surgery reduced large, buoyant LDL (P < .0001), but had no effect on the small, dense LDL. The large HDL subfractions increased (P < .0001), but there was no effect on the smaller HDL subfractions. The ratio for SAA/PON1 was reduced after the lifestyle intervention (P < .01) and further reduced after bariatric surgery (P < .0001). Neither the lifestyle intervention nor bariatric surgery had any effect on CEC. Lifestyle intervention followed by bariatric surgery in 34 morbidly obese patients showed favorable effects on TGs, LDL-C, and apoB. HDL cholesterol and apoA1 was increased, apoB/apoA1 ratio as well as SAA/PON1 ratio reduced, but bariatric

  10. Changes in acetylcholinesterase activities in the developing and ...

    African Journals Online (AJOL)

    Results from this study indicated highly significant (P<0.01) age effects in the pons, hippocampus, hypothalamus, cerebral cortex and medulla oblongata and to a lesser level (P<0.05) in the amygdala, midbrain and neurohypophysis. The pons was linearly negative with advancing age and AChE activities significantly ...

  11. MRI quantification of non-Gaussian water diffusion in normal human kidney: a diffusional kurtosis imaging study.

    Science.gov (United States)

    Huang, Yanqi; Chen, Xin; Zhang, Zhongping; Yan, Lifen; Pan, Dan; Liang, Changhong; Liu, Zaiyi

    2015-02-01

    Our aim was to prospectively evaluate the feasibility of diffusional kurtosis imaging (DKI) in normal human kidney and to report preliminary DKI measurements. Institutional review board approval and informed consent were obtained. Forty-two healthy volunteers underwent diffusion-weighted imaging (DWI) scans with a 3-T MR scanner. b values of 0, 500 and 1000 s/mm(2) were adopted. Maps of fractional anisotropy (FA), mean diffusivity (MD), radial diffusivity (D⊥), axial diffusivity (D||), mean kurtosis (MK), radial kurtosis (K⊥) and axial kurtosis (K||) were produced. Three representative axial slices in the upper pole, mid-zone and lower pole were selected in the left and right kidney. On each selected slice, three regions of interest were drawn on the renal cortex and another three on the medulla. Statistical comparison was performed with t-test and analysis of variance. Thirty-seven volunteers successfully completed the scans. No statistically significant differences were observed between the left and right kidney for all metrics (p values in the cortex: FA, 0.114; MD, 0.531; D⊥, 0.576; D||, 0.691; MK, 0.934; K⊥, 0.722; K||, 0.891; p values in the medulla: FA, 0.348; MD, 0.732; D⊥, 0.470; D||, 0.289; MK, 0.959; K⊥, 0.780; K||, 0.287). Kurtosis metrics (MK, K||, K⊥) obtained in the renal medulla were significantly (p Gaussian behavior of water diffusion, especially in the renal medulla. Copyright © 2014 John Wiley & Sons, Ltd.

  12. Paraoxonase in cardiovascular disease : actions and interactions

    NARCIS (Netherlands)

    Himbergen, Thomas Mattheus van

    2006-01-01

    Paraoxonase type 1 (PON1) is an enzyme which belongs to the family of paraoxonases. Other members of the paraoxonase family are PON2 and PON3. In the human body, PON1 is located exclusively on the high-density lipoprotein (HDL) particle. As the name 'paraoxonase' indicates, PON1 can hydrolyze the

  13. Novel toggle-rate based energy-efficient scheme for heavy load real-time IM-DD OFDM-PON with ONU LLID identification in time-domain using amplitude decision.

    Science.gov (United States)

    Qin, Youxiang; Zhang, Junjie

    2017-07-10

    A novel low complexity and energy-efficient scheme by controlling the toggle-rate of ONU with time-domain amplitude identification is proposed for a heavy load downlink in an intensity-modulation and direct-detection orthogonal frequency division multiplexing passive optical network (IM-DD OFDM-PON). In a conventional OFDM-PON downlink, all ONUs have to perform demodulation for all the OFDM frames in a broadcast way no matter whether the frames are targeted to or not, which causes a huge energy waste. However, in our scheme, the optical network unit (ONU) logical link identifications (LLIDs) are inserted into each downlink OFDM frame in time-domain at the optical line terminal (OLT) side. At the ONU side, the LLID is obtained with a low complexity and high precision amplitude identification method. The ONU sets the toggle-rate of demodulation module to zero when the frames are not targeted to, which avoids unnecessary digital signal processing (DSP) energy consumption. Compared with the sleep-mode methods consisting of clock recovery and synchronization, toggle-rate shows its advantage in fast changing, which is more suitable for the heavy load scenarios. Moreover, for the first time to our knowledge, the characteristics of the proposed scheme are investigated in a real-time IM-DD OFDM system, which performs well at the received optical power as low as -21dBm. The experimental results show that 25.1% energy consumption can be saved in the receiver compared to the conventional configurations.

  14. Repeated forced swim stress affects the expression of pCREB and ΔFosB and the acetylation of histone H3 in the rostral ventromedial medulla and locus coeruleus.

    Science.gov (United States)

    Imbe, Hiroki; Kimura, Akihisa

    2016-10-01

    The rostral ventromedial medulla (RVM) and locus coeruleus (LC) play crucial roles in descending pain modulation system. In the present study we examined the expression of phospho-cAMP response element-binding protein (pCREB) and ΔFosB and the acetylation of histone H3 in the RVM and LC after forced swim stress (FS) and complete Freund's adjuvant (CFA) injection to clarify changes in descending pain modulatory system in a rat model of stress-induced hyperalgesia. FS (day 1, 10min; days 2-3, 20min) induced a significant increase in the expression of pCREB and ΔFosB and the acetylation of histone H3 in the RVM, whereas the FS induced a significant increase only in the acetylation of histone H3 in the LC. CFA injection into the hindpaw did not induce a significant change in those expression and acetylation. Quantitative image analysis demonstrated that the numbers of pCREB-, acetylated histone H3- and ΔFosB-IR cells in the RVM were significantly higher in the FS group than those in the naive group. The CFA injection after the FS did not affect the FS-induced increases in the expression of pCREB and ΔFosB and the acetylation of histone H3 in the RVM even though nullified the increase in the acetylation of histone H3 in the LC. These findings suggest different neuroplasticities between the RVM and LC after the FS, which may be involved in activity change of descending pain modulatory system after the CFA injection. Copyright © 2016 Elsevier Inc. All rights reserved.

  15. Redox-Sensitive Oxidation and Phosphorylation of PTEN Contribute to Enhanced Activation of PI3K/Akt Signaling in Rostral Ventrolateral Medulla and Neurogenic Hypertension in Spontaneously Hypertensive Rats

    Science.gov (United States)

    Wu, Kay L.H.; Wu, Chiung-Ai; Wu, Chih-Wei; Chan, Samuel H.H.; Chang, Alice Y.W.

    2013-01-01

    Abstract Aims: The activity of phosphoinositide 3-kinase (PI3K)/serine/threonine protein kinase (Akt) is enhanced under hypertension. The phosphatase and tensin homolog deleted on chromosome 10 (PTEN) is a negative regulator of PI3K signaling, and its activity is redox-sensitive. In the rostral ventrolateral medulla (RVLM), which is responsible for the maintenance of blood pressure, oxidative stress plays a pivotal role in neurogenic hypertension. The present study evaluated the hypothesis that redox-sensitive inactivation of PTEN results in enhanced PI3K/Akt signaling in RVLM, leading to neurogenic hypertension. Results: Compared to age-matched normotensive Wistar-Kyoto (WKY) rats, PTEN inactivation in the form of oxidation and phosphorylation were greater in RVLM of spontaneously hypertensive rats (SHR). PTEN inactivation was accompanied by augmented PI3K activity and PI3K/Akt signaling, as reflected by the increase in phosphorylation of Akt and mammalian target of rapamycin. Intracisternal infusion of tempol or microinjection into the bilateral RVLM of adenovirus encoding superoxide dismutase significantly antagonized the PTEN inactivation and blunted the enhanced PI3K/Akt signaling in SHR. Gene transfer of PTEN to RVLM in SHR also abrogated the enhanced Akt activation and promoted antihypertension. Silencing PTEN expression in RVLM with small-interfering RNA, on the other hand, augmented PI3K/Akt signaling and promoted long-term pressor response in normotensive WKY rats. Innovation: The present study demonstrated for the first time that the redox-sensitive check-and-balance process between PTEN and PI3K/Akt signaling is engaged in the pathogenesis of hypertension. Conclusion: We conclude that an aberrant interplay between the redox-sensitive PTEN and PI3k/Akt signaling in RVLM underpins neural mechanism of hypertension. Antioxid. Redox Signal. 18, 36–50. PMID:22746319

  16. Cristobalite and Hematite Particles in Human Brain.

    Science.gov (United States)

    Kopani, Martin; Kopaniova, A; Trnka, M; Caplovicova, M; Rychly, B; Jakubovsky, J

    2016-11-01

    Foreign substances get into the internal environment of living bodies and accumulate in various organs. Cristobalite and hematite particles in the glial cells of pons cerebri of human brain with diagnosis of Behhet disease with scanning electron microscopy (SEM), energy-dispersive microanalysis (EDX), and transmission electron microscopy (TEM) with diffraction were identified. SEM with EDX revealed the matter of irregular micrometer-sized particles sometimes forming polyhedrons with fibrilar or stratified structure. It was found in some particles Ti, Fe, and Zn. Some particles contained Cu. TEM and electron diffraction showed particles of cristobalite and hematite. The presence of the particles can be a result of environmental effect, disruption of normal metabolism, and transformation of physiologically iron-ferrihydrite into more stable form-hematite. From the size of particles can be drawn the long-term accumulation of elements in glial cells.

  17. [Selective stimulations and lesions of the rat brain nuclei as the models for research of the human sleep pathology mechanisms].

    Science.gov (United States)

    Šaponjić, Jasna

    2011-01-01

    Many complex behavioral phenomena such as sleep can not be explained without multidisciplinary experimental approach, and complementay approaches in the animal models "in vivo" and human studies. Electrophysiological, pharmacological, anatomical and immunohistochemical techniques, and particularly stereotaxically guided local nanovolume microinjection technique, enable us to selectively stimulate and lesion the brain nuclei or their specific neuronal subpopulation, and to reslove the mechanisms of certain brain structure regulatory role, and its afferent-efferent connectivity within the brain. Local stereotaxically guided nanovolume microinjection technique enable us to investigate in animals the brain nulcei functional topography with a resolution of sleep neuronal substrates is based on animal studies primarly in cat and rat. Selective pharmacological stimulation of the pedunculopontine tegmentum (PPT) in freely moving rat, using glutamate microinjection, proved that excitation of its cholinergic part is necessary for induction of wakefulness or REM (Datta S, 2001). Local nanovolume glutamate microinjection into PPT of anesthetized rats (Saponjić et al, 2003a) additionally evidenced P-wave and respiratory regulating neuronal subpopulation within the cholinergic compartment of PPT (apneogenic neuronal zone). Local microinjection of serotonin and noradrenaline into cholinergic PPT apneogenic zone evidenced their opposed impact through PPT on breathing, in contrast to their convergent regulatory role in behavioral state control (Saponjić et al., 2005a). Also, selective pharmacological stimulation by microinjection of DL-homocysteic acid defined four neuronal micro-circuitry approximately 500 microm in lenght of breathing-related neurons within the ventral respiratory group of medulla oblongata, which when stimulated produce different effects on respiratory rate, rhythm and amplitude, and on blood pressure. This study was the first high resolution study in order to

  18. Two Cases of Acute Disseminated Encephalomyelitis Following Vaccination Against Human Papilloma Virus.

    Science.gov (United States)

    Sekiguchi, Kenji; Yasui, Naoko; Kowa, Hisatomo; Kanda, Fumio; Toda, Tatsushi

    We herein present two cases of acute disseminated encephalomyelitis (ADEM) following vaccination against human papilloma virus (HPV). Case 1 experienced diplopia and developed an unstable gait 14 days after a second vaccination of Cervarix. Brain magnetic resonance imaging (MRI) showed an isolated small, demyelinating lesion in the pontine tegmentum. Case 2 experienced a fever and limb dysesthesia 16 days after a second vaccination of Gardasil. Brain MRI revealed hyperintense lesion in the pons with slight edema on a T2-weighted image. Both cases resolved completely. It is important to accumulate further data on confirmed cases of ADEM temporally associated with HPV vaccination.

  19. Characterization of human thymic exosomes.

    Science.gov (United States)

    Skogberg, Gabriel; Gudmundsdottir, Judith; van der Post, Sjoerd; Sandström, Kerstin; Bruhn, Sören; Benson, Mikael; Mincheva-Nilsson, Lucia; Baranov, Vladimir; Telemo, Esbjörn; Ekwall, Olov

    2013-01-01

    Exosomes are nanosized membrane-bound vesicles that are released by various cell types and are capable of carrying proteins, lipids and RNAs which can be delivered to recipient cells. Exosomes play a role in intercellular communication and have been described to mediate immunologic information. In this article we report the first isolation and characterization of exosomes from human thymic tissue. Using electron microscopy, particle size determination, density gradient measurement, flow cytometry, proteomic analysis and microRNA profiling we describe the morphology, size, density, protein composition and microRNA content of human thymic exosomes. The thymic exosomes share characteristics with previously described exosomes such as antigen presentation molecules, but they also exhibit thymus specific features regarding surface markers, protein content and microRNA profile. Interestingly, thymic exosomes carry proteins that have a tissue restricted expression in the periphery which may suggest a role in T cell selection and the induction of central tolerance. We speculate that thymic exosomes may provide the means for intercellular information exchange necessary for negative selection and regulatory T cell formation of the developing thymocytes within the human thymic medulla.

  20. Characterization of human thymic exosomes.

    Directory of Open Access Journals (Sweden)

    Gabriel Skogberg

    Full Text Available Exosomes are nanosized membrane-bound vesicles that are released by various cell types and are capable of carrying proteins, lipids and RNAs which can be delivered to recipient cells. Exosomes play a role in intercellular communication and have been described to mediate immunologic information. In this article we report the first isolation and characterization of exosomes from human thymic tissue. Using electron microscopy, particle size determination, density gradient measurement, flow cytometry, proteomic analysis and microRNA profiling we describe the morphology, size, density, protein composition and microRNA content of human thymic exosomes. The thymic exosomes share characteristics with previously described exosomes such as antigen presentation molecules, but they also exhibit thymus specific features regarding surface markers, protein content and microRNA profile. Interestingly, thymic exosomes carry proteins that have a tissue restricted expression in the periphery which may suggest a role in T cell selection and the induction of central tolerance. We speculate that thymic exosomes may provide the means for intercellular information exchange necessary for negative selection and regulatory T cell formation of the developing thymocytes within the human thymic medulla.

  1. Recension to: Chehtman, Alejandro (2013. Fundamentación filosófica de la justicia penal extraterritorial. Madrid: Marcial pons

    Directory of Open Access Journals (Sweden)

    José Manuel Díaz Soto

    2016-06-01

    Full Text Available This recension aims to expose in general terms the theory formulated by de Professor Alejandro Chehtman about the base of the universal and international jurisdiction over the international crimes. At the same time, it presents some respectful critics to the Chehtman’s tesis, particularly about the arguments that conduce him to reject the Luban’s tesis regarding the quid of the crimes against humanity. Finally it exposes some considerations about the utility of the Chehtman’s theory in a transitional justice process, like the one that is taking place in Colombia.

  2. Crystallization and preliminary X-ray diffraction analysis of human phosphate-binding protein

    Energy Technology Data Exchange (ETDEWEB)

    Contreras-Martel, Carlos; Carpentier, Philippe; Morales, Renaud [Laboratoire de Cristallogenèse et Cristallographie des Protéines, Institut de Biologie Structurale J.-P. Ebel, 38027 Grenoble (France); Renault, Frédérique [Unité d’Enzymologie, Département de Toxicologie, Centre de Recherches du Service de Santé des Armées, 38702 La Tronche (France); Chesne-Seck, Marie-Laure [Laboratoire de Cristallographie Macromoléculaire, Institut de Biologie Structurale J.-P. Ebel, 38027 Grenoble (France); Rochu, Daniel; Masson, Patrick [Unité d’Enzymologie, Département de Toxicologie, Centre de Recherches du Service de Santé des Armées, 38702 La Tronche (France); Fontecilla-Camps, Juan Carlos [Laboratoire de Cristallogenèse et Cristallographie des Protéines, Institut de Biologie Structurale J.-P. Ebel, 38027 Grenoble (France); Chabrière, Eric, E-mail: eric.chabriere@lcm3b.uhp-nancy.fr [Unité d’Enzymologie, Département de Toxicologie, Centre de Recherches du Service de Santé des Armées, 38702 La Tronche (France); Laboratoire de Cristallographie et Modélisation des Matériaux Minéraux et Biologiques, CNRS-Université Henri Poincaré, 54506 Vandoeuvre-lès-Nancy (France); Laboratoire de Cristallogenèse et Cristallographie des Protéines, Institut de Biologie Structurale J.-P. Ebel, 38027 Grenoble (France)

    2006-01-01

    The purification, detergent-exchange protocol and crystallization conditions that led to the discovery of HPBP are reported. HPBP is a new human apoprotein that is absent from the genomic database and is the first phosphate transporter characterized in human plasma. Human phosphate-binding protein (HPBP) was serendipitously discovered by crystallization and X-ray crystallography. HPBP belongs to a eukaryotic protein family named DING that is systematically absent from the genomic database. This apoprotein of 38 kDa copurifies with the HDL-associated apoprotein paraoxonase (PON1) and binds inorganic phosphate. HPBP is the first identified transporter capable of binding phosphate ions in human plasma. Thus, it may be regarded as a predictor of phosphate-related diseases such as atherosclerosis. In addition, HPBP may be a potential therapeutic protein for the treatment of such diseases. Here, the purification, detergent-exchange protocol and crystallization conditions that led to the discovery of HPBP are reported.

  3. A novel wavelength reused bidirectional RoF-WDM-PON architecture to mitigate reflection and Rayleigh backscattered noise in multi-Gb/s m-QAM OFDM SSB upstream and downstream transmission over a single fiber

    Science.gov (United States)

    Patel, Dhananjay; Dalal, U. D.

    2017-05-01

    A novel m-QAM Orthogonal Frequency Division Multiplexing (OFDM) Single Sideband (SSB) architecture is proposed for centralized light source (CLS) bidirectional Radio over Fiber (RoF) - Wavelength Division Multiplexing (WDM) - Passive Optical Network (PON). In bidirectional transmission with carrier reuse over the single fiber, the Rayleigh Backscattering (RB) noise and reflection (RE) interferences from optical components can seriously deteriorate the transmission performance of the fiber optic systems. These interferometric noises can be mitigated by utilizing the optical modulation schemes at the Optical Line Terminal (OLT) and Optical Network Unit (ONU) such that the spectral overlap between the optical data spectrum and the RB and RE noise is minimum. A mathematical model is developed for the proposed architecture to accurately measure the performance of the transmission system and also to analyze the effect of interferometric noise caused by the RB and RE. The model takes into the account the different modulation schemes employed at the OLT and the ONU using a Mach Zehnder Modulator (MZM), the optical launch power and the bit-rates of the downstream and upstream signals, the gain of the amplifiers at the OLT and the ONU, the RB-RE noise, chromatic dispersion of the single mode fiber and optical filter responses. In addition, the model analyzes all the components of the RB-RE noise such as carrier RB, signal RB, carrier RE and signal RE, thus providing the complete representation of all the physical phenomena involved. An optical m-QAM OFDM SSB signal acts as a test signal to validate the model which provides excellent agreement with simulation results. The SSB modulation technique using the MZM at the OLT and the ONU differs in the data transmission technique that takes place through the first-order higher and the lower optical sideband respectively. This spectral gap between the downstream and upstream signals reduces the effect of Rayleigh backscattering and

  4. Cuando las negras se desnudan: la experiencia inasible del cuerpo caribeño y afrodiaspórico en la creación plástica de María Magdalena Campos-Pons y la narrativa de Mayra Santos Febres

    OpenAIRE

    Casamayor-Cisneros, Odette; University of Connecticut-Storrs

    2015-01-01

    Estudiando nuevas expresiones de la experiencia afrodiaspórica en las Américas, este artículo examina la obra de dos importantes creadoras negras del Caribe: la artista plástica cubana residente en los Estados Unidos, María Magdalena CamposPons (1959), y la escritora puertorriqueña Mayra Santos Febres (1966). Se analizan particularmente las maneras en que sus obras recrean procesos de identificación de género, raza y nación en el Caribe y su diáspora. Cuerpo, performance, erotismo y ritualida...

  5. Preferential affinity of /sup 3/H-2-oxo-quazepam for type I benzodiazepine recognition sites in the human brain

    Energy Technology Data Exchange (ETDEWEB)

    Corda, M.G.; Giorgi, O.; Longoni, B.; Ongini, E.; Montaldo, S.; Biggio, G.

    1988-01-01

    The hypnotic drug quazepam and its active metabolite 2-oxo-quazepam (2-oxo-quaz) are two benzodiazepines (BZ) containing a trifluoroethyl moiety on the ring nitrogen at position 1, characterized by their preferential affinity for Type I BZ recognition sites. In the present study we characterized the binding of /sup 3/H-2-oxo-quaz in discrete areas of the human brain. Saturation analysis demonstrated specific and saturable binding of /sup 3/H-2-oxo-quaz to membrane preparations from human cerebellum. Hill plot analysis of displacement curves of /sup 3/H-flunitrazepam binding by 2-oxo-quaz yielded Hill coefficients of approximately 1 in the cerebellum and significantly less than 1 in the cerebral cortex, hippocampus, caudate nucleus, thalamus and pons. Self and cross displacement curves for /sup 3/H-FNT and /sup 3/H-2-oxo-quaz binding in these brain areas indicated that 2-oxo-quaz binds with different affinities to two populations of binding sites. High affinity binding sites were more abundant in the cerebellum, cerebral cortex, hippocampus and thalamus, whereas low affinity sites were predominant in the caudate nucleus and pons. Competition studies of /sup 3/H-2-oxo-quaz and /sup 3/H-FNT using unlabelled ligands indicated that compounds which preferentially bind to Type I sites are more potent at displacing /sup 3/H-2-oxo-quaz than /sup 3/H-FNT from cerebral cortex membrane preparations. 26 references, 2 figures, 3 tables.

  6. Validation of the ovine fetus as an experimental model for the human myelomeningocele defect: a pilot study

    Directory of Open Access Journals (Sweden)

    Denise Araujo Lapa Pedreira

    2006-09-01

    Full Text Available Objective: To produce a myelomeningocele-like human defect inthe ovine fetus and validate this experimental model in ourpopulation. Methods: A prospective study on 12 pregnant sheep ofa crossed Hampshire/Down breed where a spinal defect wassurgically created between day 75 and day 77 after conception.The technique consisted of a hysterotomy with exposure of fetalhind limbs and tail up to the mid spine. Fetal skin, paravertebralmuscles, and 4 posterior spinal arches were excised, exposingthe spinal cord. Duramater was opened and the medulla was inciseduntil the medullar canal. Animals were euthanized at 139 days ofgestation for fetal evaluation. The central nervous system wassubmitted to post-mortem magnetic resonance imaging (MRI andthe spine was submitted to pathological examination. Results:The defect was created in 13 fetuses and 5 survived. Meangestational age at necropsy was 121.6 days (varying from 93 to145 days. Macroscopically, the defect was present in 4 cases.Microscopy revealed a flattened medulla with disappearance ofthe medullar canal and disruption of normal medullar cellarchitecture with neuronal apoptosis and/or fusion of the piamaterand duramater. The MRI showed herniation of the cerebellum intothe cervical canal and syringomyelia. Conclusions: The surgicallyproduced defect mimics defects in the human fetus, including theArnold-Chiari malformation. Post-mortem MRI was used for thefirst time in our study and proved an excellent alternative fordemonstrating the cerebellar herniation. We standardized thetechnique for creating the defect in our population.

  7. Metals and Paraoxonases.

    Science.gov (United States)

    Costa, Lucio G; Cole, Toby B; Garrick, Jacqueline M; Marsillach, Judit; Furlong, Clement E

    2017-01-01

    The paraoxonases (PONs) are a three-gene family which includes PON1, PON2, and PON3. PON1 and PON3 are synthesized primarily in the liver and a portion is secreted in the plasma, where they are associated with high-density lipoproteins (HDLs), while PON2 is an intracellular enzyme, expressed in most tissues and organs, including the brain. PON1 received its name from its ability to hydrolyze paraoxon, the active metabolite of the organophosphorus (OP) insecticide parathion, and also more efficiently hydrolyzes the active metabolites of several other OPs. PON2 and PON3 do not have OP-esterase activity, but all PONs are lactonases and are capable of hydrolyzing a variety of lactones, including certain drugs, endogenous compounds, and quorum-sensing signals of pathogenic bacteria. In addition, all PONs exert potent antioxidant effects. PONs play important roles in cardiovascular diseases and other oxidative stress-related diseases, modulate susceptibility to infection, and may provide neuroprotection (PON2). Hence, significant attention has been devoted to their modulation by a variety of dietary, pharmacological, lifestyle, or environmental factors. A number of metals have been shown in in vitro, animal, and human studies to mostly negatively modulate expression of PONs, particularly PON1, the most studied in this regard. In addition, different levels of expression of PONs may affect susceptibility to toxicity and neurotoxicity of metals due to their aforementioned antioxidant properties.

  8. Binding of (/sup 3/H)-5-hydroxytryptamine to homogenates of human brain

    Energy Technology Data Exchange (ETDEWEB)

    Dehlin, E.; Marcusson, J.; Winblad, B. (Umea Univ. (Sweden). Dept. of Pathology); Fowler, C.J. (Centre de Recherche Delalande, Rueil-Malmaison (France))

    1982-01-01

    The binding of (/sup 3/H)-5-hydroxytryptamine ((/sup 3/H)-5-HT) to homogenates of human brain has been studied. The specific binding is saturable, with a Ksub(d) (frontal cortex) of 12+-2 nM, and is inhibited by non-radioactive 5-HT (IC/sub 50/ = 26 nM) and D-Lysergic acid diethylamide (IC/sub 50/ = 20 nM). Specific, but not non-specific binding of (/sup 3/H)-5-HT was inhibited by incubation of the homogenates at 50/sup 0/C. The binding of (/sup 3/H)-5-HT across the human brain was not uniform, the highest binding being found in the substantia nigra and hippocampus, and the lowest in the thalamus and pons. The Ksub(d) of the binding sites towards 5-HT did, however, appear to be similar for the different brain regions.

  9. Crystallization and preliminary X-ray diffraction analysis of human phosphate-binding protein.

    Science.gov (United States)

    Contreras-Martel, Carlos; Carpentier, Philippe; Morales, Renaud; Renault, Frédérique; Chesne-Seck, Marie Laure; Rochu, Daniel; Masson, Patrick; Fontecilla-Camps, Juan Carlos; Chabrière, Eric

    2006-01-01

    Human phosphate-binding protein (HPBP) was serendipitously discovered by crystallization and X-ray crystallography. HPBP belongs to a eukaryotic protein family named DING that is systematically absent from the genomic database. This apoprotein of 38 kDa copurifies with the HDL-associated apoprotein paraoxonase (PON1) and binds inorganic phosphate. HPBP is the first identified transporter capable of binding phosphate ions in human plasma. Thus, it may be regarded as a predictor of phosphate-related diseases such as atherosclerosis. In addition, HPBP may be a potential therapeutic protein for the treatment of such diseases. Here, the purification, detergent-exchange protocol and crystallization conditions that led to the discovery of HPBP are reported.

  10. Evoked corticospinal output to the human scalene muscles is altered by lung volume.

    Science.gov (United States)

    Hudson, Anna L; Taylor, Janet L; Anand, Ashima; Gandevia, Simon C; Butler, Jane E

    2012-03-15

    Increases in lung volume inhibit the inspiratory output from the medulla, but the effect of lung inflation on the voluntary control of breathing in humans is not known. We tested corticospinal excitability using transcranial magnetic stimulation (TMS) to evoke a response in the scalene muscles. TMS was delivered at rest at three different lung volumes between functional residual capacity (FRC) and total lung capacity (TLC) during incremental inspiratory and incremental expiratory manoeuvres. Motor evoked potentials (MEPs) in scalenes were ∼50% larger at a high lung volume (FRC+∼90% inspiratory capacity [IC]) compared to lower lung volumes (FRC and FRC+∼40% IC) in both inspiratory and expiratory manoeuvres (plung inflation on the automatic and voluntary control of breathing in humans. Copyright © 2011 Elsevier B.V. All rights reserved.

  11. Regional distribution of high affinity binding of 3H-adenosine in rat brain

    Energy Technology Data Exchange (ETDEWEB)

    Traversa, U.; Puppini, P.; de Angelis, L.; Vertua, R.

    1984-06-01

    The high and low affinity adenosine binding sites with Kd values ranging respectively from 0.8 to 1.65 microM and from 3.1 to 13.86 microM were demonstrated in the following rat brain areas: cortex, hippocampus, striatum, cerebellum, diencephalon, and pons-medulla. Adenosine receptors involved in the high affinity binding seem to be mainly Ra-type. The analysis of the regional distribution of 3H-Adenosine showed the highest levels of specific binding in striatum and hippocampus; somewhat smaller values in cortex, cerebellum, and diencephalon, and even lower in pons-medulla.

  12. Favorable effect of short-term lifestyle intervention on human paraoxonase-1 activity and adipokine levels in childhood obesity.

    Science.gov (United States)

    Koncsos, Péter; Seres, Ildikó; Harangi, Mariann; Páll, Dénes; Józsa, Lajos; Bajnok, László; Nagy, Endre V; Paragh, György

    2011-10-01

    The prevalence of obesity is increasing in adult and child populations throughout the world. Childhood obesity has a great impact on adult cardiovascular morbidity and mortality; treatment of this pathological state is important given the significant health consequences. We investigated the effect of short-term lifestyle changes on the alteration of human serum paraoxonase-1 (PON1) activities, leptin, adiponectin, E-selectin, and asymmetric dimethylarginine (ADMA) as atherogenic and antiatherogenic factors in obese children. PON1 protects lipoproteins against oxidation by hydrolyzing lipid peroxides in oxidized low density lipoprotein (LDL) and therefore may protect against atherosclerosis. A total of 23 white obese and overweight children (age, 11.43 ± 1.78 years; 8 girls, 15 boys) participated in a 2-week-long lifestyle camp based on a diet and exercise program. Overweight and obesity were defined according to the national body mass index (BMI) reference tables for age and sex. After a 2-week-long supervised diet and aerobic exercise program, obese children had significantly lower leptin (55.02 ± 33.42 ng/ml vs 25.37 ± 19.07 ng/ml; p obesity. These findings emphasize the major role of primary prevention and nonpharmaceutical treatment of childhood obesity through lifestyle changes based on diet and increased physical activity.

  13. Stem cells in the development and differentiation of the human adrenal glands.

    Science.gov (United States)

    Terada, Tadashi

    2015-01-01

    There are no studies on stem cells (SCs) and development and differentiation (DD) of the human adrenal glands. The SCs in DD of the adrenal glands were herein investigated histochemically and immunohistochemically in 18 human embryonic adrenal glands at gestational week (GW) 7-40. At 7 GW, the adrenal glands were present, and at 7 GW, numerous embryonic SCs (ESCs) are seen to create the adrenal cortex. The ESCs were composed exclusively of small cells with hyperchromatic nuclei without nucleoli. The ESCs were positive for neural cell adhesion molecule, KIT, neuron-specific enolase, platelet-derived growth factor receptor-α, synaptophysin, and MET. They were negative for other SC antigens, including chromogranin, ErbB2, and bcl-2. They were also negative for lineage antigens, including cytokeratin (CK)7, CK8, CK18, and CK19, carcinoembryonic antigen, carbohydrate antigen 19-9, epithelial membrane antigen, HepPar1, mucin core apoprotein (MUC)1, MUC2, MUC5AC, and MUC6, and cluster differentiation (CD)3, CD45, CD20, CD34, and CD31. The Ki-67 labeling index (LI) was high (Ki-67 LI = around 20%). α-Fetoprotein was positive in the ESCs and adrenal cells. The ESC was first seen in the periphery of the adrenal cortex at 7-10 GW. The ESC migrates into the inner part of the adrenal cortex. Huge islands of ESC were present near the adrenal, and they appeared to provide the ESC of the adrenal. At 16 GW, adrenal medulla appeared, and the adrenal ESCs were present in the periphery or the cortex, in the cortical parenchyma, corticomedullary junctions, and in the medulla. The adrenal essential architecture was established around 20 GW; however, there were still ESCs. At term, there are a few ESCs. These data suggest that the adrenal glands were created by ESCs. © 2014 Wiley Periodicals, Inc.

  14. Presence of kisspeptin-like immunoreactivity in human adrenal glands and adrenal tumors.

    Science.gov (United States)

    Takahashi, Kazuhiro; Shoji, Itaru; Shibasaki, Akiko; Kato, Ichiro; Hiraishi, Keisuke; Yamamoto, Hajime; Kaneko, Kiriko; Murakami, Osamu; Morimoto, Ryo; Satoh, Fumitoshi; Ito, Sadayoshi; Totsune, Kazuhito

    2010-05-01

    Kisspeptins are neuropeptides which activate the hypothalamo-pituitary gonadal axis and are considered to play important physiological roles in the reproduction. Kisspeptins have also been reported to stimulate the aldosterone secretion from the adrenal cortex. However, the expression of kisspeptins in human adrenal glands and adrenal tumors has not been clarified yet. We, therefore, studied the presence of kisspeptin-like immunoreactivity (LI) in human adrenal glands and adrenal tumors (adrenocortical adenomas, adrenocortical carcinomas, and pheochromocytomas) by radioimmunoassay and immunocytochemistry. Kisspeptin-LI was detected in all the tissues examined; normal portions of adrenal glands (3.0 +/- 2.3 pmol/g wet weight, n = 21, mean +/- SD), aldosterone-producing adenomas (4.6 +/- 3.3 pmol/g wet weight, n = 10), cortisol-producing adenomas (2.7 +/- 1.4 pmol/g wet weight, n = 14), adrenocortical carcinomas (1.7 +/- 0.2 pmol/g wet weight, n = 4), and pheochromocytomas (1.8 +/- 0.8 pmol/g wet weight, n = 6). There was no significant difference in kisspeptin-LI levels among them. Immunocytochemistry showed positive kisspeptin-immunostaining in normal adrenal glands, with stronger immunostaining found in the medulla. Furthermore, positive kisspeptin-immunostaining was found in all types of adrenal tumors examined; adrenocortical adenomas, adrenocortical carcinomas, and pheochromocytomas. The intensity of kisspeptin-immunostaining in these adrenal tumors was, however, not so strong as that in normal adrenal medulla. The present study has shown for the first time the presence of kisspeptin-LI in adrenal glands and adrenal tumors.

  15. Cell therapy with human renal cell cultures containing erythropoietin-positive cells improves chronic kidney injury.

    Science.gov (United States)

    Yamaleyeva, Liliya M; Guimaraes-Souza, Nadia K; Krane, Louis S; Agcaoili, Sigrid; Gyabaah, Kenneth; Atala, Anthony; Aboushwareb, Tamer; Yoo, James J

    2012-05-01

    New therapeutic strategies for chronic kidney disease (CKD) are necessary to offset the rising incidence of CKD and donor shortage. Erythropoietin (EPO), a cytokine produced by fibroblast-like cells in the kidney, has recently emerged as a renoprotective factor with anti-inflammatory, antioxidant properties. This study (a) determined whether human renal cultures (human primary kidney cells [hPKC]) can be enriched in EPO-positive cells (hPKC(F+)) by using magnetic-bead sorting; (b) characterized hPKC(F+) following cell separation; and (c) established that intrarenal delivery of enriched hPKC(F+) cells would be more beneficial in treatment of renal injury, inflammation, and oxidative stress than unsorted hPKC cultures in a chronic kidney injury model. Fluorescence-activated cell sorting analysis revealed higher expression of EPO (36%) and CD73 (27%) in hPKC(F+) as compared with hPKC. After induction of renal injury, intrarenal delivery of hPKC(F+) or hPKC significantly reduced serum creatinine, interstitial fibrosis in the medulla, and abundance of CD68-positive cells in the cortex and medulla (p renal cortex and decreased urinary albumin (3.5-fold) and urinary tubular injury marker kidney injury molecule 1 (16-fold). hPKC(F+) also significantly reduced levels of renal cortical monocyte chemotactic protein 1 (1.8-fold) and oxidative DNA marker 8-hydroxy-deoxyguanosine (8-OHdG) (2.4-fold). After 12 weeks, we detected few injected cells, which were localized mostly to the cortical interstitium. Although cell therapy with either hPKC(F+) or hPKC improved renal function, the hPKC(F+) subpopulation provides greater renoprotection, perhaps through attenuation of inflammation and oxidative stress. We conclude that hPKC(F+) may be used as components of cell-based therapies for degenerative kidney diseases.

  16. Neonatal 6-hydroxydopamine treatment: Noradrenaline levels and in vitro 3H-catecholamine synthesis in discrete brain regions of adult rats

    NARCIS (Netherlands)

    Versteeg, D.H.G.; Ree, J.M. van; Provoost, Abraham P.; Jong, Wybren de

    1974-01-01

    Endogenous noradrenaline levels are elevated in medulla oblongata, mesencephalon, pons and thalamus of adult rats which had been treated with 6-hydroxydopamine on days 1, 2, 8 and 15 after birth. Levels in spinal cord, cerebellum, hippocampus/amygdala and cortex are depressed, whereas no significant

  17. [Neuron reactions of brain structures suppressing motion during development of animal hypnosis in guinea pigs].

    Science.gov (United States)

    Mileĭkovskiĭ, B Iu; Karmanova, I G; Oganesian, G A

    1998-01-01

    Multisensory and motor units are suppressed in hypnosis in the guinea pig giganto-cellular reticular nucleus and in the dorsolateral. pons. In contrast, inhibitory intexneuvons neurons and the ponto-medulla neurons are activated in hypnosis. The data obtained suggests a key role of the brain-stem structures in descending unspecific inhibition during hypnosis in animals.

  18. Expression of pemphigus-autoantigen desmoglein 1 in human thymus.

    Science.gov (United States)

    Mouquet, H; Berrih-Aknin, S; Bismuth, J; Joly, P; Gilbert, D; Tron, F

    2008-05-01

    Desmoglein (Dsg) 1 is a transmembrane glycoprotein of the desmosome allowing cell-cell adhesion between keratinocytes, whose expression is restricted to stratified squamous epithelia-like epidermis. Dsg1 is the target autoantigen of pathogenic autoantibodies produced by pemphigus foliaceus and 50% of pemphigus vulgaris patients in a Dsg1-specific T-cell-dependent pathway. Herewith, we show that mRNA of the DSG1 gene is present in normal human thymus and show by quantitative real-time polymerase chain reaction analysis that the expression of DSG1 transcript increases with age. Although immunoblot analysis on human thymus extracts using different anti-Dsg1 antibodies did not allow to detect the protein, we show by double-immunofluorescence assay that Dsg1 is expressed at protein level by CD19+ CD63+ cells located in the medulla. These data provide another illustration of the thymic expression of a tissue-specific autoantigen involved in an organ-specific autoimmune disease, which may participate in the tolerance acquisition and/or regulation of Dsg1-specific T cells.

  19. Pirenzepine binding to membrane-bound, solubilized and purified muscarinic receptor subtypes

    Energy Technology Data Exchange (ETDEWEB)

    Baumgold, J.

    1986-05-01

    Muscarinic receptors were purified to near-homogeneity from bovine cortex, an area rich in the putative M1 subtype, and from bovine pons/medulla, an area rich in the putative M2 subtype. In both cases, the receptors were solubilized in digitonin and purified over an affinity column. Both the cortical and pons/medulla preparations yielded receptor proteins of 70,000 daltons. Pirenzepine binding was deduced from its competition with /sup 3/H-N-methyl scopolamine. The binding of pirenzepine to membrane-bound receptors from cortex was best described by a two site model, with approximately half the sites having a Ki of 6.4 x 10/sup -9/ M and the remaining sites having a Ki of 3.5 x 10/sup -7/ M. Membrane-bound receptors from pons/medulla bound pirenzepine according to a one-site model with a Ki of 1.1 x 10/sup -7/ M. After solubilization the two-site binding of cortical receptors became a one-site binding, Ki = 1.1 x 10/sup -7/M. This value was still five-fold lower than that of soluble receptors from pons/medulla. After purification however the affinity of pirenzepine for the pons/medulla receptor increased so that the two putative subtypes bound pirenzepine with approximately the same affinity. These findings suggest that the different pirenzepine binding characteristics used to define muscarinic receptor subtypes are not inherent in the receptor protein itself but may be due to coupling factors associated with the receptor.

  20. Assesment of Osteoporosis in Medulla Spinalis Injured Patients

    Directory of Open Access Journals (Sweden)

    Zuhal Bayırlı Karakoyun

    2011-12-01

    Full Text Available Aim: To investigate the relationship between osteoporosis and demographic features, clinical characteristics,risk factors in younger SCI patients. Materials and Methods: Between January-June 2009, all SCI patients admitted to our hospital evaluated and 58 patients who were younger than 50 years who had osteoporosis were enrolled.Patients age, gender, educational status, duration of injury, smoking, sunlight exposure and dietary habits were questioned. Neurological level, completeness, ambulation status and spasticity were assessed. Relationship between these findings with the severity of osteoporosis has been viewed. Results: There were 19 women. Mean age was 35,7 years. The mean time since injury were 117.7 months. 42 patients were paraplegia (17 complete, 16 were tetraplegia (4 complete.The most common osteoporotic site where the legs. There was no correlation between BMD values with age. In men, the legs and total body BMD were significantly lower.The effect of educational level on BMD was not found. No significant correlation was found between time since injury and BMD. In paraplegics, femoral neck and total femur Z-scores were significantly lower. In tetraplegics, Z scores of the arms were lower, but was not significant. Lumbar BMD values of complete patients were significantly lower than incompletes. Sunlight exposure and consumption of milk/milk products had not a significant positive effect on BMD. 8 patients had therapeutic ambulation, whereas 23 of them had community ambulation. Ambulation status of patients and the presence of spasticity was no effect on BMD. There was no significant correlation between BMD and the severity of spasticity. Smokers (n=19, bone density was lower in all regions except for femoral neck but were not significantly. Conclusion: Male gender, paraplegia, and incompleteness negatively effects the bone density. Age, time since injury, education level, spasticity, ambulation level, smoking, sunlight exposure and dietary habits has no significant effect on bone density. (Turkish Journal of Osteoporosis 2011;17:71-6

  1. Idiopathic REM sleep behaviour disorder in the development of Parkinson's disease.

    Science.gov (United States)

    Boeve, Bradley F

    2013-05-01

    Parkinson's disease is a progressive neurodegenerative disorder associated with Lewy body disease pathology in central and peripheral nervous system structures. Although the cause of Parkinson's disease is not fully understood, clinicopathological analyses have led to the development of a staging system for Lewy body disease-associated pathological changes. This system posits a predictable topography of progression of Lewy body disease in the CNS, beginning in olfactory structures and the medulla, then progressing rostrally from the medulla to the pons, then to midbrain and substantia nigra, limbic structures, and neocortical structures. If this topography and temporal evolution of Lewy body disease does occur, other manifestations of the disease as a result of degeneration of olfactory and pontomedullary structures could theoretically begin many years before the development of prominent nigral degeneration and the associated parkinsonian features of Parkinson's disease. One such manifestation of prodromal Parkinson's disease is rapid eye movement (REM) sleep behaviour disorder, which is a parasomnia manifested by vivid dreams associated with dream enactment behaviour during REM sleep. Findings from animal and human studies have suggested that lesions or dysfunction in REM sleep and motor control circuitry in the pontomedullary structures cause REM sleep behaviour disorder phenomenology, and degeneration of these structures might explain the presence of REM sleep behaviour disorder years or decades before the onset of parkinsonism in people who develop Parkinson's disease. Copyright © 2013 Elsevier Ltd. All rights reserved.

  2. Gene expression and functional annotation of the human and mouse choroid plexus epithelium.

    Directory of Open Access Journals (Sweden)

    Sarah F Janssen

    Full Text Available BACKGROUND: The choroid plexus epithelium (CPE is a lobed neuro-epithelial structure that forms the outer blood-brain barrier. The CPE protrudes into the brain ventricles and produces the cerebrospinal fluid (CSF, which is crucial for brain homeostasis. Malfunction of the CPE is possibly implicated in disorders like Alzheimer disease, hydrocephalus or glaucoma. To study human genetic diseases and potential new therapies, mouse models are widely used. This requires a detailed knowledge of similarities and differences in gene expression and functional annotation between the species. The aim of this study is to analyze and compare gene expression and functional annotation of healthy human and mouse CPE. METHODS: We performed 44k Agilent microarray hybridizations with RNA derived from laser dissected healthy human and mouse CPE cells. We functionally annotated and compared the gene expression data of human and mouse CPE using the knowledge database Ingenuity. We searched for common and species specific gene expression patterns and function between human and mouse CPE. We also made a comparison with previously published CPE human and mouse gene expression data. RESULTS: Overall, the human and mouse CPE transcriptomes are very similar. Their major functionalities included epithelial junctions, transport, energy production, neuro-endocrine signaling, as well as immunological, neurological and hematological functions and disorders. The mouse CPE presented two additional functions not found in the human CPE: carbohydrate metabolism and a more extensive list of (neural developmental functions. We found three genes specifically expressed in the mouse CPE compared to human CPE, being ACE, PON1 and TRIM3 and no human specifically expressed CPE genes compared to mouse CPE. CONCLUSION: Human and mouse CPE transcriptomes are very similar, and display many common functionalities. Nonetheless, we also identified a few genes and pathways which suggest that the CPE

  3. Neural contributions to the motivational control of appetite in humans.

    Science.gov (United States)

    Hinton, Elanor C; Parkinson, John A; Holland, Anthony J; Arana, F Sergio; Roberts, Angela C; Owen, Adrian M

    2004-09-01

    The motivation to eat in humans is a complex process influenced by intrinsic mechanisms relating to the hunger and satiety cascade, and extrinsic mechanisms based on the appetitive incentive value of individual foods, which can themselves induce desire. This study was designed to investigate the neural basis of these two factors contributing to the control of motivation to eat within the same experimental design using positron emission tomography. Using a novel counterbalanced approach, participants were scanned in two separate sessions, once after fasting and once after food intake, in which they imagined themselves in a restaurant and considered a number of items on a menu, and were asked to choose their most preferred. All items were tailored to each individual and varied in their incentive value. No actual foods were presented. In response to a hungry state, increased activation was shown in the hypothalamus, amygdala and insula cortex as predicted, as well as the medulla, striatum and anterior cingulate cortex. Satiety, in contrast, was associated with increased activation in the lateral orbitofrontal and temporal cortex. Only activity in the vicinity of the amygdala and orbitofrontal cortex was observed in response to the processing of extrinsic appetitive incentive information. These results suggest that the contributions of intrinsic homeostatic influences, and extrinsic incentive factors to the motivation to eat, are somewhat dissociable neurally, with areas of convergence in the amygdala and orbitofrontal cortex. The findings of this study have implications for research into the underlying mechanisms of eating disorders.

  4. Human Brain Stem Structures Respond Differentially to Noxious Heat

    Directory of Open Access Journals (Sweden)

    Alexander eRitter

    2013-09-01

    Full Text Available Concerning the physiological correlates of pain, the brain stem is considered to be one core region that is activated by noxious input. In animal studies, different slopes of skin heating (SSH with noxious heat led to activation in different columns of the midbrain periaqueductal grey (PAG. The present study aimed at finding a method for differentiating structures in PAG and other brain stem structures, which are associated with different qualities of pain in humans according to the structures that were associated with different behavioral significances to noxious thermal stimulation in animals. Brain activity was studied by fMRI in healthy subjects in response to steep and shallow SSH with noxious heat. We found differential activation to different SSH in the PAG and the rostral ventromedial medulla (RVM. In a second experiment we demonstrate that the different SSH were associated with different pain qualities. Our experiments provide evidence that brainstem structures, i.e. the PAG and the RVM, become differentially activated by different SSH. Therefore, different SSH can be utilized when brain stem structures are investigated and when it is aimed to activate these structures differentially. Moreover, percepts of first pain were elicited by shallow SSH whereas percepts of second pain were elicited by steep SSH. The stronger activation of these brain stem structures to SSH, eliciting percepts of second vs. first pain, might be of relevance for activating different coping strategies in response to the noxious input with the two types of SSH.

  5. More Human than Human.

    Science.gov (United States)

    Lawrence, David

    2017-07-01

    Within the literature surrounding nonhuman animals on the one hand and cognitively disabled humans on the other, there is much discussion of where beings that do not satisfy the criteria for personhood fit in our moral deliberations. In the future, we may face a different but related problem: that we might create (or cause the creation of) beings that not only satisfy but exceed these criteria. The question becomes whether these are minimal criteria, or hierarchical, such that those who fulfill them to greater degree should be afforded greater consideration. This article questions the validity and necessity of drawing divisions among beings that satisfy the minimum requirements for personhood; considering how future beings-intelligent androids, synthezoids, even alternate-substrate sentiences-might fit alongside the "baseline" human. I ask whether these alternate beings ought to be considered different to us, and why this may or may not matter in terms of a notion of "human community." The film Blade Runner, concerned in large part with humanity and its key synthezoid antagonist Roy Batty, forms a framing touchstone for my discussion. Batty is stronger, faster, more resilient, and more intelligent than Homo sapiens. His exploits, far beyond the capability of normal humans, are contrasted with his frailty and transient lifespan, his aesthetic appreciation of the sights he has seen, and his burgeoning empathy. Not for nothing does his creator within the mythos term him "more human than human."

  6. Neurochemical organization of the nucleus paramedianus dorsalis in the human.

    Science.gov (United States)

    Baizer, Joan S; Baker, James F; Haas, Kristin; Lima, Raquel

    2007-10-24

    We have characterized the neurochemical organization of a small brainstem nucleus in the human brain, the nucleus paramedianus dorsalis (PMD). PMD is located adjacent and medial to the nucleus prepositus hypoglossi (PH) in the dorsal medulla and is distinguished by the pattern of immunoreactivity of cells and fibers to several markers including calcium-binding proteins, a synthetic enzyme for nitric oxide (neuronal nitric oxide synthase, nNOS) and a nonphosphorylated neurofilament protein (antibody SMI-32). In transverse sections, PMD is oval with its long axis aligned with the dorsal border of the brainstem. We identified PMD in eight human brainstems, but found some variability both in its cross-sectional area and in its A-P extent among cases. It includes calretinin immunoreactive large cells with oval or polygonal cell bodies. Cells in PMD are not immunoreactive for either calbindin or parvalbumin, but a few fibers immunoreactive to each protein are found within its central region. Cells in PMD are also immunoreactive to nNOS, and immunoreactivity to a neurofilament protein shows many labeled cells and fibers. No similar region is identified in atlases of the cat, mouse, rat or monkey brain, nor does immunoreactivity to any of the markers that delineate it in the human reveal a comparable region in those species. The territory that PMD occupies is included in PH in other species. Since anatomical and physiological data in animals suggest that PH may have multiple subregions, we suggest that the PMD in human may be a further differentiation of PH and may have functions related to the vestibular control of eye movements.

  7. [{sup 18}F]Fluoroethylflumazenil: a novel tracer for PET imaging of human benzodiazepine receptors

    Energy Technology Data Exchange (ETDEWEB)

    Gruender, G.; Lange-Asschenfeldt, C.; Vernaleken, I.; Lueddens, H. [Dept. of Psychiatry, Univ. of Mainz (Germany); Siessmeier, T.; Buchholz, H.-G.; Bartenstein, P. [Dept. of Nuclear Medicine, Univ. of Mainz (Germany); Stoeter, P. [Dept. of Neuroradiology, Univ. of Mainz (Germany); Drzezga, A. [Department of Nuclear Medicine, Technical University of Munich (Germany); Roesch, F. [Inst. for Nuclear Chemistry, Univ. of Mainz (Germany)

    2001-10-01

    5-(2'-[{sup 18}F]Fluoroethyl)flumazenil ([{sup 18}F]FEF) is a fluorine-18 labelled positron emission tomography (PET) tracer for central benzodiazepine receptors. Compared with the established [{sup 11}C]flumazenil, it has the advantage of the longer half-life of the fluorine-18 label. After optimisation of its synthesis and determination of its in vitro receptor affinities, we performed first PET studies in humans. PET studies in seven healthy human volunteers were performed on a Siemens ECAT EXACT whole-body scanner after injection of 100-280 MBq [{sup 18}F]FEF. In two subjects, a second PET scan was conducted after pretreatment with unlabelled flumazenil (1 mg or 2.5 mg i.v., 3 min before tracer injection). A third subject was studied both with [{sup 18}F]FEF and with [{sup 11}C]flumazenil. Brain radioactivity was measured for 60-90 min p.i. and analysed with a region of interest-oriented approach and on a voxelwise basis with spectral analysis. Plasma radioactivity was determined from arterial blood samples and metabolites were determined by high-performance liquid chromatography. In human brain, maximum radioactivity accumulation was observed 4{+-}2 min p.i., with a fast clearance kinetics resulting in 50% and 20% of maximal activities at about 10 and 30 min, respectively. [{sup 18}F]FEF uptake followed the known central benzodiazepine receptor distribution in the human brain (occipital cortex >temporal cortex >cerebellum >thalamus >pons). Pretreatment with unlabelled flumazenil resulted in reduced tracer uptake in all brain areas except for receptor-free reference regions like the pons. Parametric images of distribution volume and binding potential generated on a voxelwise basis revealed two- to three-fold lower in vivo receptor binding of [{sup 18}F]FEF compared with [{sup 11}C]flumazenil, while relative uptake of [{sup 18}F]FEF was higher in the cerebellum, most likely owing to its relatively higher affinity for benzodiazepine receptors containing the

  8. The effect of divalent metal chelators and cadmium on serum phosphotriesterase, lactonase and arylesterase activities of paraoxonase 1.

    Science.gov (United States)

    Bizoń, Anna; Milnerowicz, Halina

    2018-03-01

    Paraoxonase 1 (PON1) is calcium dependent enzyme involved in many functions in human body. PON1 is synthesized in the liver and secreted to the bloodstream where bounds high-density lipoproteins (HDL). Association of PON1 with HDL increases the enzyme stability and biological activities. PON1 have three different activities: phosphotriesterase, lactonase and arylesterase. Until now there is now commercial available kits to determine these three PON1 activities. Also there is no date about stability of PON1 in serum after storage condition. We have elaborated the optimal conditions for determination of PON1 activities in serum using manual procedure as well as the best storage temperature of human serum for determination of PON1 activities. We have also confirmed that PON1 in serum is associated with HDL. Additionally we have investigated the effect of D-penicillamine, ethylenediaminetetraacetic acid and cadmium chloride on PON1 activities in human serum. D-penicillamine and ethylenediaminetetraacetic acid in therapeutic doses as well as cadmium chloride in toxic doses decrease PON1 activities in human serum when compared to non-treated serum. D-penicillamine as metal chelator inhibits much stronger PON1 activities than ethylenediaminetetraacetic acid. Copyright © 2018 Elsevier B.V. All rights reserved.

  9. Magnetic Resonance and Spectroscopy of the Human Brain in Gulf War Illness

    National Research Council Canada - National Science Library

    Weiner, Michael W

    2005-01-01

    The goal of this project is to test the hypotheses that: Subjects with GWI have reduced NAA in the basal ganglia and pons, which are not accounted for by confounds such as PTSD, depression, and alcohol abuse...

  10. Magnetic Resonance and Spectroscopy of the Human Brain in Gulf War Illness

    National Research Council Canada - National Science Library

    Weiner, Michael

    2004-01-01

    The goal of this project is to test the hypotheses that: 1) Subjects with GWI have reduced NAA in the basal ganglia and pons, which are not accounted for by confounds such as PTSD, depression, and alcohol abuse. 2...

  11. Expression of autoimmune regulator gene (AIRE) and T regulatory cells in human thymomas.

    Science.gov (United States)

    Scarpino, S; Di Napoli, A; Stoppacciaro, A; Antonelli, M; Pilozzi, E; Chiarle, R; Palestro, G; Marino, M; Facciolo, F; Rendina, E A; Webster, K E; Kinkel, S A; Scott, H S; Ruco, L

    2007-09-01

    Expression of the autoimmune regulator gene (AIRE) and the presence of CD25(+)/forkhead box p3 (FoxP3)(+) T regulatory (T(reg)) cells were investigated in histologically normal adult thymi and in thymomas using immunohistochemistry and quantitative real-time polymerase chain reaction (PCR). In the normal thymus staining for AIRE was detected in the nucleus of some epithelial-like cells located in the medulla; in thymomas AIRE-positive cells were extremely rare and could be detected only in the areas of medullary differentiation of two B1 type, organoid thymomas. RNA was extracted from 36 cases of thymoma and 21 non-neoplastic thymi obtained from 11 myasthenic (MG(+)) and 10 non-myasthenic (MG(-)) patients. It was found that AIRE is 8.5-fold more expressed in non-neoplastic thymi than in thymomas (P = 0.01), and that the amount of AIRE transcripts present in the thymoma tissue are not influenced by the association with MG, nor by the histological type. A possible involvement of AIRE in the development of MG was suggested by the observation that medullary thymic epithelial cells isolated from AIRE-deficient mice contain low levels of RNA transcripts for CHRNA 1, a gene coding for acetylcholine receptor. Expression of human CHRNA 1 RNA was investigated in 34 human thymomas obtained from 20 MG(-) patients and 14 MG(+) patients. No significant difference was found in the two groups (thymoma MG(+), CHRNA1 = 0.013 +/- 0.03; thymoma MG-, CHRNA1 = 0.01 +/- 0.03). In normal and hyperplastic thymi CD25(+)/Foxp3(+) cells were located mainly in the medulla, and their number was not influenced by the presence of MG. Foxp3(+) and CD25(+) cells were significantly less numerous in thymomas. A quantitative estimate of T(reg) cells revealed that the levels of Foxp3 RNA detected in non-neoplastic thymi were significantly higher (P = 0.02) than those observed in 31 cases of thymomas. Our findings indicate that the tissue microenvironment of thymomas is defective in the expression of

  12. Helminths of wild hybrid marmosets (Callithrix sp. living in an environment with high human activity

    Directory of Open Access Journals (Sweden)

    Alexandre de Oliveira Tavela

    Full Text Available The objective of this study was to identify the helminth fauna in hybrid, non-native marmosets, through analysis of fecal samples. The study involved 51 marmosets (genus Callithrix from five groups living in places with levels of human impact in Viçosa-MG. The marmosets were caught using a multiple-entrance trap and were anaesthetized. Feces were collected, refrigerated and analyzed by means of the sedimentation technique (Hoffmann-Pons-Janner. Eggs and parasites were identified, but not counted. Most of the marmosets (86% were parasitized by at least one genus of helminths. Among the infected marmosets, 37% presented co-infection. The intestinal helminths comprised four different taxa: Primasubulura jacchi, Ancylostomatidae, Prosthenorchis sp. and Dilepididae.P. jacchi and Ancylostomatidae had higher prevalences (> 80% and > 40%, respectively and were found in all marmoset groups. Dilepididae species were found in almost all the groups, but only accounted for around 30% of the marmosets. Prosthenorchis sp. showed a relatively low prevalence (< 10% and was only found in one group. Although two parasites are commonly found in marmosets and other primates (P. jacchi and Prosthenorchis sp., our study is the first record for Ancylostomatidae and Dilepididae. Factors like marmosets' feeding behavior and their contact with humans and other species of nonhuman primates seem to be determinants of infection among marmosets.

  13. Comparative effects of ACTH, PACAP, and VIP on fetal human adrenal cells.

    Science.gov (United States)

    Chamoux, E; Breault, L; LeHoux, J G; Gallo-Payet, N

    1998-01-01

    ACTH is a well-known stimulus of human adrenal cells, both in the adult and in the fetus. Two other stimuli, acting via the cAMP pathway, are also involved in the regulation of steroidogenesis and growth of the adult gland, the Pituitary Adenylate Cyclase Activating Peptide (PACAP) and the Vasoactive Intestinal Polypeptide (VIP). The aim of this study was to compare the effects of the three peptides on cAMP production and to investigate their possible effect on cytoskeletal organization in the different cell types present in the human fetal adrenal gland, i.e steroidogenic cells and chromaffin cells. Using phalloidin-rhodamine labeling of actin microfilaments, we observed that VIP and ACTH strongly affect cytoskeletal organization. Application of ACTH rapidly induces steroidogenic cells to elaborate fillopodia and junctions with neighboring cells. Application of VIP strongly stimulates the chromaffin cells to elaborate neurite-like extensions, suggesting that the effects of VIP could be, as in adult glands, mediated by the adrenal medulla.

  14. Functional Neuroimaging Insights into the Physiology of Human Sleep

    Science.gov (United States)

    Dang-Vu, Thien Thanh; Schabus, Manuel; Desseilles, Martin; Sterpenich, Virginie; Bonjean, Maxime; Maquet, Pierre

    2010-01-01

    Functional brain imaging has been used in humans to noninvasively investigate the neural mechanisms underlying the generation of sleep stages. On the one hand, REM sleep has been associated with the activation of the pons, thalamus, limbic areas, and temporo-occipital cortices, and the deactivation of prefrontal areas, in line with theories of REM sleep generation and dreaming properties. On the other hand, during non-REM (NREM) sleep, decreases in brain activity have been consistently found in the brainstem, thalamus, and in several cortical areas including the medial prefrontal cortex (MPFC), in agreement with a homeostatic need for brain energy recovery. Benefiting from a better temporal resolution, more recent studies have characterized the brain activations related to phasic events within specific sleep stages. In particular, they have demonstrated that NREM sleep oscillations (spindles and slow waves) are indeed associated with increases in brain activity in specific subcortical and cortical areas involved in the generation or modulation of these waves. These data highlight that, even during NREM sleep, brain activity is increased, yet regionally specific and transient. Besides refining the understanding of sleep mechanisms, functional brain imaging has also advanced the description of the functional properties of sleep. For instance, it has been shown that the sleeping brain is still able to process external information and even detect the pertinence of its content. The relationship between sleep and memory has also been refined using neuroimaging, demonstrating post-learning reactivation during sleep, as well as the reorganization of memory representation on the systems level, sometimes with long-lasting effects on subsequent memory performance. Further imaging studies should focus on clarifying the role of specific sleep patterns for the processing of external stimuli, as well as the consolidation of freshly encoded information during sleep. Citation: Dang

  15. Human rights

    NARCIS (Netherlands)

    Gaay Fortman, B. de

    2006-01-01

    Human rights reflect a determined effort to protect the dignity of each and every human being against abuse of power. This endeavour is as old as human history. What is relatively new is the international venture for the protection of human dignity through internationally accepted legal standards

  16. Hypoxia regulates microRNA expression in the human carotid body

    Energy Technology Data Exchange (ETDEWEB)

    Mkrtchian, Souren, E-mail: souren.mkrtchian@ki.se [Section for Anesthesiology and Intensive Care Medicine, Department of Physiology and Pharmacology, Karolinska Institute, SE-171 77 Stockholm (Sweden); Lee, Kian Leong, E-mail: csilkl@nus.edu.sg [Cancer Science Institute of Singapore, National University of Singapore, 117599 Singapore (Singapore); Kåhlin, Jessica [Section for Anesthesiology and Intensive Care Medicine, Department of Physiology and Pharmacology, Karolinska Institute, SE-171 77 Stockholm (Sweden); Function Perioperative Medicine and Intensive Care, Karolinska University Hospital, SE-171 76 Stockholm (Sweden); Ebberyd, Anette [Section for Anesthesiology and Intensive Care Medicine, Department of Physiology and Pharmacology, Karolinska Institute, SE-171 77 Stockholm (Sweden); Poellinger, Lorenz [Cancer Science Institute of Singapore, National University of Singapore, 117599 Singapore (Singapore); Department of Cell and Molecular Biology, Karolinska Institute, SE-171 77 Stockholm (Sweden); Fagerlund, Malin Jonsson; Eriksson, Lars I. [Section for Anesthesiology and Intensive Care Medicine, Department of Physiology and Pharmacology, Karolinska Institute, SE-171 77 Stockholm (Sweden); Function Perioperative Medicine and Intensive Care, Karolinska University Hospital, SE-171 76 Stockholm (Sweden)

    2017-03-15

    The carotid body (CB) is the key sensing organ for physiological oxygen levels in the body. Under conditions of low oxygen (hypoxia), the CB plays crucial roles in signaling to the cardiorespiratory center in the medulla oblongata for the restoration of oxygen homeostasis. How hypoxia regulates gene expression in the human CB remains poorly understood. While limited information on transcriptional regulation in animal CBs is available, the identity and impact of important post-transcriptional regulators such as non-coding RNAs, and in particular miRNAs are not known. Here we show using ex vivo experiments that indeed a number of miRNAs are differentially regulated in surgically removed human CB slices when acute hypoxic conditions were applied. Analysis of the hypoxia-regulated miRNAs shows that they target biological pathways with upregulation of functions related to cell proliferation and immune response and downregulation of cell differentiation and cell death functions. Comparative analysis of the human CB miRNAome with the global miRNA expression patterns of a large number of different human tissues showed that the CB miRNAome had a unique profile which reflects its highly specialized functional status. Nevertheless, the human CB miRNAome is most closely related to the miRNA expression pattern of brain tissues indicating that they may have the most similar developmental origins. - Highlights: • Hypoxia triggers differential expression of many miRNAs in the human carotid body. • This can lead to the upregulation of proliferation and immune response functions. • CB expression profile in the carotid body resembles the miRNA expression pattern in the brain. • miRNAs are involved in the regulation of carotid body functions including oxygen sensing.

  17. Human Rights, Human Needs, Human Development, Human Security

    OpenAIRE

    Gasper, D.R.

    2007-01-01

    Human rights, human development and human security form increasingly important, partly interconnected, partly competitive and misunderstood ethical and policy discourses. Each tries to humanize a pre-existing and unavoidable major discourse of everyday life, policy and politics; each has emerged within the United Nations world; each relies implicitly on a conceptualisation of human need; each has specific strengths. Yet mutual communication, understanding and co-operation are deficient, espec...

  18. Regulation of catecholamine release in human adrenal chromaffin cells by β-adrenoceptors.

    Science.gov (United States)

    Cortez, Vera; Santana, Magda; Marques, Ana Patrícia; Mota, Alfredo; Rosmaninho-Salgado, Joana; Cavadas, Cláudia

    2012-03-01

    The adrenal gland plays a fundamental role in the response to a variety of stress situations. After a stress condition, adrenal medullary chromaffin cells release, by exocytosis, high quantities of catecholamine (epinephrine, EP; norepinephrine, NE), especially EP. Once in the blood stream, catecholamines reach different target organs, and induce their biological actions through the activation of different adrenoceptors. Adrenal gland cells may also be activated by catecholamines, through hormonal, paracrine and/or autocrine system. The presence of functional adrenoceptors on human adrenal medulla and their involvement on catecholamines secretion was not previously evaluated. In the present study we investigated the role of β(1)-, β(2)- and β(3)-adrenoceptors on catecholamine release from human adrenal chromaffin cells in culture. We observed that the β-adrenoceptor agonist (isoproterenol) and β(2)-adrenoceptor agonist (salbutamol) stimulated catecholamine (NE and EP) release from human adrenal chromaffin cells. Furthermore, the β(2)-adrenoceptor antagonist (ICI 118,551; 100 nM) and β(3)-adrenoceptor antagonist (SR 59230A; 100 nM) inhibited the catecholamine release stimulated by isoproterenol and nicotine in chromaffin cells. The β(1)-adrenoceptor antagonist (atenolol; 100 nM) did not change the isoproterenol- neither the nicotine-evoked catecholamine release from human adrenal chromaffin cells. Moreover, our results show that the protein kinase A (PKA), protein kinase C (PKC), mitogen-activated protein kinase (MAPK) and phospholipase C (PLC) are intracellular mechanisms involved in the catecholamine release evoked by salbutamol. In conclusion, our data suggest that the activation of β(2)- and β(3)-adrenoceptors modulate the basal and evoked catecholamine release, NE and EP, via an autocrine positive feedback loop in human adrenal chromaffin cells. Copyright © 2012 Elsevier Ltd. All rights reserved.

  19. Human Monkeypox

    National Research Council Canada - National Science Library

    Wilson, Mary E; Hughes, James M; McCollum, Andrea M; Damon, Inger K

    2014-01-01

    Human monkeypox is found primarily in forested areas of Central Africa. This article provides a basic review of the clinical, epidemiological, and biological factors that contribute to human disease...

  20. Design and FPGA implementation for MAC layer of Ethernet PON

    Science.gov (United States)

    Zhu, Zengxi; Lin, Rujian; Chen, Jian; Ye, Jiajun; Chen, Xinqiao

    2004-04-01

    Ethernet passive optical network (EPON), which represents the convergence of low-cost, high-bandwidth and supporting multiple services, appears to be one of the best candidates for the next-generation access network. The work of standardizing EPON as a solution for access network is still underway in the IEEE802.3ah Ethernet in the first mile (EFM) task force. The final release is expected in 2004. Up to now, there has been no standard application specific integrated circuit (ASIC) chip available which fulfills the functions of media access control (MAC) layer of EPON. The MAC layer in EPON system has many functions, such as point-to-point emulation (P2PE), Ethernet MAC functionality, multi-point control protocol (MPCP), network operation, administration and maintenance (OAM) and link security. To implement those functions mentioned above, an embedded real-time operating system (RTOS) and a flexible programmable logic device (PLD) with an embedded processor are used. The software and hardware functions in MAC layer are realized through programming embedded microprocessor and field programmable gate array(FPGA). Finally, some experimental results are given in this paper. The method stated here can provide a valuable reference for developing EPON MAC layer ASIC.

  1. Dynamic capacity allocation for low-cost multicarrier multimode PON

    NARCIS (Netherlands)

    Taniman, R.O.; van Bochove, A.C.; de Boer, Pieter-Tjerk; Sikkes, B.

    A stable-matching-based multiuser multicarrier capacity allocation algorithm is proposed. It responds to ONU backlogs and dynamic subchannel gains. Benchmarked against Binary Linear Programming, it results in just 5% less allocated capacity, at much lower complexity.

  2. Human microbiomics

    OpenAIRE

    Rajendhran, J.; Gunasekaran, P.

    2010-01-01

    The sequencing of the human genome has driven the study of human biology in a significant way and enabled the genome-wide study to elucidate the molecular basis of complex human diseases. Recently, the role of microbiota on human physiology and health has received much attention. The influence of gut microbiome (the collective genomes of the gut microbiota) in obesity has been demonstrated, which may pave the way for new prophylactic and therapeutic strategies such as bacteriotherapy. The sig...

  3. Human Development

    NARCIS (Netherlands)

    D.R. Gasper (Des)

    2009-01-01

    textabstract‘Human development’ language spread gradually in circles of national and international development policy and planning from the 1970s and acquired a definitive form in the 1990s in the United Nations Development Programme’s Human Development Reports (HDRs). Human development was defined

  4. Human Smuggling

    NARCIS (Netherlands)

    Siegel - Rozenblit, Dina|info:eu-repo/dai/nl/152524096; Zaitch, Damian|info:eu-repo/dai/nl/183348486

    2014-01-01

    Human smuggling is based on a consensus between smuggler, smuggled, and his/her family (which usually guarantees or effectuates payment). However, unauthorized immigrants are violating immigration laws and human smugglers are profiting from enabling illegal immigration. Both human smuggling and its

  5. Mapping of somatostatin-28 (1-12) in the alpaca (Lama pacos) brainstem.

    Science.gov (United States)

    De Souza, Eliana; Sánchez, Manuel Lisardo; Aguilar, Luís Ángel; Díaz-Cabiale, Zaida; Narváez, José Ángel; Coveñas, Rafael

    2015-05-01

    Using an indirect immunoperoxidase technique, we studied the distribution of cell bodies and fibers containing somatostatin-28 (1-12) in the alpaca brainstem. Immunoreactive fibers were widely distributed throughout the whole brainstem: 34 brainstem nuclei/regions showed a high or a moderate density of these fibers. Perikarya containing the peptide were widely distributed throughout the mesencephalon, pons and medulla oblongata. Cell bodies containing somatostatin-28 (1-12) were observed in the lateral and medial divisions of the marginal nucleus of the brachium conjunctivum, reticular formation (mesencephalon, pons and medulla oblongata), inferior colliculus, periaqueductal gray, superior colliculus, pericentral division of the dorsal tegmental nucleus, interpeduncular nucleus, nucleus of the trapezoid body, vestibular nucleus, motor dorsal nucleus of the vagus, nucleus of the solitary tract, nucleus praepositus hypoglossi, and in the substantia nigra. This widespread distribution indicates that somatostatin-28 (1-12) is involved in multiple physiological actions in the alpaca brainstem. © 2015 Wiley Periodicals, Inc.

  6. Human Technology and Human Affects

    DEFF Research Database (Denmark)

    Fausing, Bent

    2009-01-01

    Human Technology and Human Affects  This year Samsung introduced a mobile phone with "Soul". It was made with a human touch and included itself a magical touch. Which function does technology and affects get in everyday aesthetics like this, its images and interactions included this presentation...... will ask and try to answer. The mobile phone and its devices are depicted as being able to make a unique human presence, interaction, and affect. The medium, the technology is a necessary helper to get towards this very special and lost humanity. Without the technology, no special humanity - soul...... - is the prophecy. This personification or anthropomorphism is important for the branding of new technology. The technology is seen as creating a technotranscendens towards a more qualified humanity, which is in contact with the fundamental human values like intuition, vision, and sensing; all the qualities...

  7. Human Parvoviruses.

    Science.gov (United States)

    Qiu, Jianming; Söderlund-Venermo, Maria; Young, Neal S

    2017-01-01

    Parvovirus B19 (B19V) and human bocavirus 1 (HBoV1), members of the large Parvoviridae family, are human pathogens responsible for a variety of diseases. For B19V in particular, host features determine disease manifestations. These viruses are prevalent worldwide and are culturable in vitro, and serological and molecular assays are available but require careful interpretation of results. Additional human parvoviruses, including HBoV2 to -4, human parvovirus 4 (PARV4), and human bufavirus (BuV) are also reviewed. The full spectrum of parvovirus disease in humans has yet to be established. Candidate recombinant B19V vaccines have been developed but may not be commercially feasible. We review relevant features of the molecular and cellular biology of these viruses, and the human immune response that they elicit, which have allowed a deep understanding of pathophysiology. Copyright © 2016 American Society for Microbiology.

  8. Cerebral correlates of autonomic cardiovascular arousal: a functional neuroimaging investigation in humans.

    Science.gov (United States)

    Critchley, H D; Corfield, D R; Chandler, M P; Mathias, C J; Dolan, R J

    2000-02-15

    1. States of peripheral autonomic arousal accompany emotional behaviour, physical exercise and cognitive effort, and their central representation may influence decision making and the regulation of social and emotional behaviours. However, the cerebral functional neuroanatomy representing and mediating peripheral autonomic responses in humans is poorly understood. 2. Six healthy volunteer subjects underwent H215O positron emission tomography (PET) scanning while performing isometric exercise and mental arithmetic stressor tasks, and during corresponding control tasks. Mean arterial blood pressure (MAP) and heart rate (HR) were monitored during scanning. 3. Data were analysed using statistical parametric mapping (SPM99). Conjunction analyses were used to determine significant changes in regional cerebral blood flow (rCBF) during states of cardiovascular arousal common to both exercise and mental stressor tasks. 4. Exercise and mental stressor tasks, relative to their control tasks, were associated with significantly (P exercise and mental stress tasks, increased rCBF in cerebellar vermis, right anterior cingulate and right insula covaried with MAP; rCBF in pons, cerebellum and right insula covaried with HR. Cardiovascular arousal in both categorical and covariance analyses was associated with decreased rCBF in prefrontal and medial temporal regions. 5. Neural responses in discrete brain regions accompany peripheral cardiovascular arousal. We provide evidence for the involvement of areas previously implicated in cognitive and emotional behaviours in the representation of peripheral autonomic states, consistent with a functional organization that produces integrated cardiovascular response patterns in the service of volitional and emotional behaviours.

  9. Induced magnetic force in human heads exposed to 4 T MRI.

    Science.gov (United States)

    Wang, Ruiliang; Wang, Gene-Jack; Goldstein, Rita Z; Caparelli, Elisabeth C; Volkow, Nora D; Fowler, Joanna S; Tomasi, Dardo

    2010-04-01

    To map the distribution of the magnetic force induced in the human head during magnetic resonance imaging (MRI) at 4 T for a large group of healthy volunteers. The magnetic field distribution in the head of 100 men and 18 women was mapped using phase mapping techniques. Statistical parametric mapping methods using a family-wise error (FWE) corrected threshold P magnetic force. The strength of the magnetic force density in the head was lower than 11.5 +/- 5.3 N/m(3) (right eyeball). The strength of the magnetic force density induced in occipital cortex varied linearly with the x-rotation (pitch) angle. We found that the induced magnetic force is highly significant in the eyeballs, orbitofrontal and temporal cortices, subcallosal gyrus, anterior cingulate as well as midbrain and brainstem (pons), regardless of subjects' age or gender. The maximum induced magnetic force was 6 x 10(5) times weaker than the gravitational force; thus, biological effects of the magnetic force during imaging are not expected to be significant. (c) 2010 Wiley-Liss, Inc.

  10. Expression of iron-related genes in human brain and brain tumors

    Directory of Open Access Journals (Sweden)

    Britton Robert S

    2009-04-01

    Full Text Available Abstract Background Defective iron homeostasis may be involved in the development of some diseases within the central nervous system. Although the expression of genes involved in normal iron balance has been intensively studied in other tissues, little is known about their expression in the brain. We investigated the mRNA levels of hepcidin (HAMP, HFE, neogenin (NEO1, transferrin receptor 1 (TFRC, transferrin receptor 2 (TFR2, and hemojuvelin (HFE2 in normal human brain, brain tumors, and astrocytoma cell lines. The specimens included 5 normal brain tissue samples, 4 meningiomas, one medulloblastoma, 3 oligodendrocytic gliomas, 2 oligoastrocytic gliomas, 8 astrocytic gliomas, and 3 astrocytoma cell lines. Results Except for hemojuvelin, all genes studied had detectable levels of mRNA. In most tumor types, the pattern of gene expression was diverse. Notable findings include high expression of transferrin receptor 1 in the hippocampus and medulla oblongata compared to other brain regions, low expression of HFE in normal brain with elevated HFE expression in meningiomas, and absence of hepcidin mRNA in astrocytoma cell lines despite expression in normal brain and tumor specimens. Conclusion These results indicate that several iron-related genes are expressed in normal brain, and that their expression may be dysregulated in brain tumors.

  11. Human Rights/Human Needs.

    Science.gov (United States)

    Canning, Cynthia

    1978-01-01

    The faculty of Holy Names High School developed an interdisciplinary human rights program with school-wide activities focusing on three selected themes: the United Nations Universal Declaration of Human Rights, in conjunction with Human Rights Week; Food; and Women. This article outlines major program activities. (SJL)

  12. In vitro inhibition of the paraoxonase from human serum with ...

    African Journals Online (AJOL)

    SERVER

    2008-03-04

    Mar 4, 2008 ... The purified PON1 enzyme was stored at 4oCin the presence of 2. mM calcium chloride in order to maintain activity. In vitro inhibition kinetic studies. For the inhibition studies, different concentrations of sulfonamide were added to the each enzyme activity. Paraoxonase and aryle- sterase activities with ...

  13. Horizontal gaze palsy with progressive scoliosis: CT and MR findings

    Energy Technology Data Exchange (ETDEWEB)

    Bomfim, Rodrigo C.; Tavora, Daniel G.F.; Nakayama, Mauro; Gama, Romulo L. [Sarah Network of Rehabilitation Hospitals, Department of Radiology, Ceara (Brazil)

    2009-02-15

    Horizontal gaze palsy with progressive scoliosis (HGPPS) is a rare congenital disorder characterized by absence of conjugate horizontal eye movements and progressive scoliosis developing in childhood and adolescence. We present a child with clinical and neuroimaging findings typical of HGPPS. CT and MRI of the brain demonstrated pons hypoplasia, absence of the facial colliculi, butterfly configuration of the medulla and a deep midline pontine cleft. We briefly discuss the imaging aspects of this rare entity in light of the current literature. (orig.)

  14. CNS depressive role of aqueous extract of Spinacia oleracea L. leaves in adult male albino rats.

    Science.gov (United States)

    Das, Sutapa; Guha, Debjani

    2008-03-01

    Treatment with Spinacia oleracea extract (SO; 400 mg/kg body weight) decreased the locomotor activity, grip strength, increased pentobarbitone induced sleeping time and also markedly altered pentylenetetrazole induced seizure status in Holtzman strain adult male albino rats. SO increased serotonin level and decreased both norepinephrine and dopamine levels in cerebral cortex, cerebellum, caudate nucleus, midbrain and pons and medulla. Result suggests that SO exerts its CNS depressive effect in PTZ induced seizure by modulating the monoamines in different brain areas.

  15. Visualization of brainstem perfusion using a high spatial resolution SPECT system.

    Science.gov (United States)

    Dierckx, R; Dobbeleir, A; Vandevivere, J; Abts, H; DeDeyn, P P

    1992-05-01

    The authors explored the high spatial resolution of a three-head rotating SPECT system, equipped with lead super-fine fanbeam collimator. The brainstem was high-lighted in a three-dimensional reconstruction, showing perfusion small structures such as mesencephalon, pons, and medulla oblongata. The visualization of brainstem perfusion sets new landmarks in functional neuroimaging and, moreover, was obtained with a commercially available three-head SPECT system.

  16. Syringomyelia and its treatment - A case report

    OpenAIRE

    Siti Musfiroh, Siti Musfiroh

    2015-01-01

    Syringomyelia is a chronic progressive degenerative disorder of the spinal cord, characterized clinically by brachial amyotrophy and segmental sensory loss of dissociated type. Pathologically shows cavitation in the central parts of the spinal cord, usually at the cervical region but extending upward into medulla oblongata and pons or downward into the thoracic or even the lumbar segments. This disorder doesn't product weakness of the limb. The early symptom, was weighty and stiffness of the ...

  17. Assessment of Morphological Variations and its Specific Location on the Surface of Adult Human Liver in Ethiopian Cadavers University of Gondar, Bahir Dar University, Addis Ababa University, St. Paulos Medical School and Hawassa University, Ethiopia

    Directory of Open Access Journals (Sweden)

    Tsegaye Mehare

    2017-10-01

    Full Text Available Background: Liver is the second largest organ next to skin and located in right hypochondrium, epigastrium and may extend to left hypochondrium in upper abdominal cavity. It accounts 2% to 3% of total body weight of individual. Land marking for interpreting different diagnostic image and localizing lesions in the liver is commonly done by major fissures. Sound knowledge about different morphological variations which are found on the surface of liver is mandatory to have safe surgical outcome. Segments of liver were extensively researched but there are only few studies dealt with the surface variation of the liver. Therefore, this study aims to assess morphological variations and its specific location on the surface of adult human liver in Ethiopian cadaver. Methodology: Institutional based cross sectional descriptive study design was conducted in 33 formalin fixed Ethiopian cadaveric livers in the Anatomy department of University of Gondar, Bahir Dar University, Addis Ababa University, St. Paulos Medical School and Hawassa University. Results: 45.45% of the liver was normal but 54.55% showed one or more variations. Additional fissures and very small left lobe with deep costal impressions were seen 27.27% and 21.21% cases respectively. Pons hepatis connecting left lobe with quadrate lobe and very deep renal impression with corset constriction were noted in 9.09% cases each. Additional lobes and absence of quadrate lobes were found in 6.06% cases each. Conclusion and Recommendation: Morphological variations on the liver surface were accessory fissure, very small left lobe with deep costal impressions, pons hepatis, shape variation and absence of quadrate lobe. The most common one among the variations was accessory fissure on the visceral and diaphragmatic surface.

  18. The thalamus and brainstem act as key hubs in alterations of human brain network connectivity induced by mild propofol sedation.

    Science.gov (United States)

    Gili, Tommaso; Saxena, Neeraj; Diukova, Ana; Murphy, Kevin; Hall, Judith E; Wise, Richard G

    2013-02-27

    Despite their routine use during surgical procedures, no consensus has yet been reached on the precise mechanisms by which hypnotic anesthetic agents produce their effects. Molecular, animal and human studies have suggested disruption of thalamocortical communication as a key component of anesthetic action at the brain systems level. Here, we used the anesthetic agent, propofol, to modulate consciousness and to evaluate differences in the interactions of remote neural networks during altered consciousness. We investigated the effects of propofol, at a dose that produced mild sedation without loss of consciousness, on spontaneous cerebral activity of 15 healthy volunteers using functional magnetic resonance imaging (fMRI), exploiting oscillations (eigenvector centrality (EC) to characterize brain network properties. The EC mapping of fMRI data in healthy humans under propofol mild sedation demonstrated a decrease of centrality of the thalamus versus an increase of centrality within the pons of the brainstem, highlighting the important role of these two structures in regulating consciousness. Specifically, the decrease of thalamus centrality results from its disconnection from a widespread set of cortical and subcortical regions, while the increase of brainstem centrality may be a consequence of its increased influence, in the mildly sedated state, over a few highly central cortical regions key to the default mode network such as the posterior and anterior cingulate cortices.

  19. Digital Humanities

    DEFF Research Database (Denmark)

    Brügger, Niels

    2016-01-01

    Digital humanities is an umbrella term for theories, methodologies, and practices related to humanities scholarship that use the digital computer as an integrated and essential part of its research and teaching activities. The computer can be used for establishing, finding, collecting......, and preserving material to study, as an object of study in its own right, as an analytical tool, or for collaborating, and for disseminating results. The term "digital humanities" was coined around 2001, and gained currency within academia in the following years. However, computers had been used within...... the humanities for decades, starting with research fields such as humanities computing or computational linguistics in the 1950s, and later new media studies and internet studies. The historical development of digital humanities has been characterized by a focus on three successive, but co-existing types...

  20. Human evolution

    DEFF Research Database (Denmark)

    Llamas, Bastien; Willerslev, Eske; Orlando, Ludovic Antoine Alexandre

    2017-01-01

    The field of human ancient DNA (aDNA) has moved from mitochondrial sequencing that suffered from contamination and provided limited biological insights, to become a fully genomic discipline that is changing our conception of human history. Recent successes include the sequencing of extinct hominins......, and true population genomic studies of Bronze Age populations. Among the emerging areas of aDNA research, the analysis of past epigenomes is set to provide more new insights into human adaptation and disease susceptibility through time. Starting as a mere curiosity, ancient human genetics has become...

  1. Human Rights, Human Needs, Human Development, Human Security - Relationships between four international human discourses.

    NARCIS (Netherlands)

    D.R. Gasper (Des)

    2007-01-01

    markdownabstractAbstract: Human rights, human development and human security form increasingly important, partly interconnected, partly competitive and misunderstood ethical and policy discourses. Each tries to humanize a pre-existing and unavoidable major discourse of everyday life, policy and

  2. Quantitative Evaluation of Brain Stem Atrophy Using Magnetic Resonance Imaging in Adult Patients with Alexander Disease.

    Science.gov (United States)

    Yoshida, Tomokatsu; Yasuda, Rei; Mizuta, Ikuko; Nakagawa, Masanori; Mizuno, Toshiki

    2017-01-01

    Brain MRI in adult patients with Alexander disease (AxD) mainly shows atrophy in the medulla oblongata. However, currently there is no quantitative standard for assessing this atrophy. In this study, we quantitatively evaluated the brain stem of AxD patients with glial fibrillary acidic protein (GFAP) mutation using conventional MRI to evaluate its usefulness as an aid to diagnosing AxD in daily clinical practice. Nineteen AxD patients with GFAP mutation were compared with 14 patients negative for GFAP mutation in whom AxD was suspected due to "atrophy of the medulla oblongata." In the GFAP mutation-positive group, the sagittal diameter of the medulla oblongata, the ratio of the diameter of the medulla oblongata to that of the midbrain (MO/MB), and the ratio of the sagittal diameter of the medulla oblongata to that of the pons (MO/Po) were significantly smaller compared to those of the GFAP mutation-negative group (p < 0.01). The sensitivity and specificity of each parameter were 87.5 and 92.3%, 91.7 and 81.3%, and 88.2 and 100% with a sagittal diameter of the medulla oblongata <9.0 mm, MO/MB <0.60, and sagittal MO/Po <0.46, respectively. These parameters can provide very useful information to differentially diagnose AxD from other disorders associated with brain stem atrophy in adult patients. © 2017 S. Karger AG, Basel.

  3. Human Rights and Human Nature

    Directory of Open Access Journals (Sweden)

    Vittorio Possenti

    2013-11-01

    Full Text Available There seems to be two different versions of human rights in Western tradition: say Rationalistic and Christian; the former adopted in revolutionary France, the latter highly developed in Renaissance Spain. Current relativistic criticisms attempt to deny the universality of human rights alleging that this theory has been created in Western countries or it has no strong justification, and therefore cannot have universal approach; but this objection can be dismissed with an alternative justification of human rights.

  4. Think Human

    DEFF Research Database (Denmark)

    Nielsen, Charlotte Marie Bisgaard

    2013-01-01

    years' campaigns suggests that the theory of communication underlying the campaign has its basis in mechanical action rather than in human communication. The practice of 'Communication design' is investigated in relation to this metaphorical 'machine thinking' model of communication and contrasted...... with the human-centered theory of communication advocated by integrationism....

  5. Human trichuriasis

    DEFF Research Database (Denmark)

    Betson, Martha; Søe, Martin Jensen; Nejsum, Peter

    2015-01-01

    Human trichuriasis is a neglected tropical disease which affects hundreds of millions of people worldwide and is particularly prevalent among children living in areas where sanitation is poor. This review examines the current knowledge on the taxonomy, genetics and phylogeography of human Trichuris...

  6. Human kapital

    DEFF Research Database (Denmark)

    Grosen, Anders; Nielsen, Peder Harbjerg

    2007-01-01

    finansiel og human kapital. Den traditionelle rådgivnings snævre synsvinkel kan føre til forkerte investeringsråd. Der skal derfor opfordres til, at de finansielle virksomheder i tilrettelæggelsen af deres rådgivning af private kunder systematisk inddrager den humane kapitals størrelse og karakteristika i...

  7. Patterns of hypoglossal nucleus development in the prenatal period of human ontogenesis: a morphometric study

    Directory of Open Access Journals (Sweden)

    V. O. Tyholaz

    2016-12-01

    Full Text Available Better understanding the origin and differentiation of neurons in the medulla oblongata will promote comprehension of different neural systems functional importance, including the hypoglossal nucleus. There are a few studies addressing histostructure and morphometric parameters of hypoglossal nucleus in human embryos and fetuses in the scientific literature. Aim. To establish the structure, morphometric parameters of the hypoglossal nucleus and the nerve cells that go to form it in the embryos and human fetuses of different gestational age. Materials and Methods. A morphological and histological study of 230 human embryos and fetuses from 6–7 to 39–40 weeks of prenatal development was carried out. Results. In the prenatal development of the hypoglossal nucleus from 17–18 weeks of gestation neuroblasts are changed from spherical to oval shape, during the 20–21 weeks polygonal nerve cells are showing in nucleus composition, and polygonal nerve cells become dominated from the 37 week. The biggest area of the hypoglossal nucleus has been determined in human fetuses at gestational age of 39–40 weeks – 0.82±0.04 mm2. The mean values of the nerve cells area are the largest in the 33–34 weeks gestational–age human fetuses – 301,2±9,3 µm2, and the mean values of the nerve cells nuclei are the largest in the 39–40 weeks gestational–age human fetuses – 101,2±3,2 µm2. Conclusions. The most intensive increase in the area of the hypoglossal nucleus identified in human fetuses at gestational age of 10–11 weeks – by 66.7 %, 12–13 weeks – by 45.4 %, 20–21 weeks – 31.2 %, 22–23 weeks – 36 %, 37–38 weeks – by 45.1 %, 39–40 weeks – by 42.7 % (p<0.01. Intensive increase in the mean neuroblasts area was detected in human fetuses at gestational age of 10–11 weeks – by 40.1 %, 17–18 weeks – 48.4 %, and decrease – in human fetuses at gestational age of 37–38 weeks – by 29.9 % (p<0.01. The most intensive

  8. Localisation and function of the endocannabinoid system in the human ovary.

    Directory of Open Access Journals (Sweden)

    Mona R El-Talatini

    Full Text Available Although anandamide (AEA had been measured in human follicular fluid and is suggested to play a role in ovarian follicle and oocyte maturity, its exact source and role in the human ovary remains unclear.Immunohistochemical examination of normal human ovaries indicated that the endocannabinoid system was present and widely expressed in the ovarian medulla and cortex with more intense cannabinoid receptor 2 (CB2 than CB1 immunoreactivity in the granulosa cells of primordial, primary, secondary, tertiary follicles, corpus luteum and corpus albicans. The enzymes, fatty acid amide hydrolase (FAAH and N-acyclphosphatidylethanolamine-phospholipase D (NAPE-PLD, were only found in growing secondary and tertiary follicles and corpora lutea and albicantes. The follicular fluid (FF AEA concentrations of 260 FF samples, taken from 37 infertile women undergoing controlled ovarian hyperstimulation for in vitro fertilisation and intracytoplasmic sperm injection with embryo transfer, were correlated with ovarian follicle size (P = 0.03. Significantly higher FF AEA concentrations were also observed in mature follicles (1.43+/-0.04 nM; mean+/-SEM compared to immature follicles (1.26+/-0.06 nM, P = 0.0142 and from follicles containing morphologically assessed mature oocytes (1.56+/-0.11 nM compared to that containing immature oocytes (0.99+/-0.09 nM, P = 0.0011. ROC analysis indicated that a FF AEA level of 1.09 nM could discriminate between mature and immature oocytes with 72.2% sensitivity and 77.14% specificity, whilst plasma AEA levels and FF AEA levels on oocyte retrieval day were not significantly different (P = 0.23.These data suggest that AEA is produced in the ovary, is under hormonal control and plays a role in folliculogenesis, preovulatory follicle maturation, oocyte maturity and ovulation.

  9. Regional distribution of neuropeptide Y and its receptor in the porcine central nervous system.

    Science.gov (United States)

    Busch-Sørensen, M; Sheikh, S P; O'Hare, M; Tortora, O; Schwartz, T W; Gammeltoft, S

    1989-05-01

    The regional distribution of neuropeptide Y (NPY) immunoreactivity and receptor binding was studied in the porcine CNS. The highest amounts of immunoreactive NPY were found in the hypothalamus, septum pellucidum, gyrus cinguli, cortex frontalis, parietalis, and piriformis, corpus amygdaloideum, and bulbus olfactorius (200-1,000 pmol/g wet weight). In the cortex temporalis and occipitalis, striatum, hippocampus, tractus olfactorius, corpus mamillare, thalamus, and globus pallidus, the NPY content was 50-200 pmol/g wet weight, whereas the striatum, colliculi, substantia nigra, cerebellum, pons, medulla oblongata, and medulla spinalis contained less than 50 pmol/g wet weight. The receptor binding of NPY was highest in the hippocampus, corpus fornicis, corpus amygdaloideum, nucleus accumbens, and neurohypophysis, with a range of 1.0-5.87 pmol/mg of protein. Intermediate binding (0.5-1.0 pmol/mg of protein) was found in the septum pellucidum, columna fornicis, corpus mamillare, cortex piriformis, gyrus cinguli, striatum, substantia grisea centralis, substantia nigra, and cerebellum. In the corpus callosum, basal ganglia, corpus pineale, colliculi, corpus geniculatum mediale, nucleus ruber, pons, medulla oblongata, and medulla spinalis, receptor binding of NPY was detectable but less than 0.5 pmol/mg of protein. No binding was observed in the bulbus and tractus olfactorius and adenohypophysis. In conclusion, immunoreactive NPY and its receptors are widespread in the porcine CNS, with predominant location in the limbic system, olfactory system, hypothalamoneurohypophysial tract, corpus striatum, and cerebral cortex.

  10. Evaluation of intra-renal oxygenation during water diuresis: A time-resolved study using BOLD MRI

    OpenAIRE

    Tumkur, S.M.; Vu, A.T.; Li, L. P.; Pierchala, L.; Prasad, P V

    2006-01-01

    Hypoxia of the renal medulla is a possible precursor to the onset of acute renal failure in humans and therefore an understanding of the factors influencing the oxygenation status within the renal medulla is very important. Blood oxygenation level-dependent (BOLD) magnetic resonance imaging (MRI) has been shown to non-invasively evaluate intra-renal oxygenation levels of the renal medulla in humans. A newly implemented three-dimensional (3-D) multiple gradient-recalled echo sequence, which pe...

  11. Human Computation

    CERN Multimedia

    CERN. Geneva

    2008-01-01

    What if people could play computer games and accomplish work without even realizing it? What if billions of people collaborated to solve important problems for humanity or generate training data for computers? My work aims at a general paradigm for doing exactly that: utilizing human processing power to solve computational problems in a distributed manner. In particular, I focus on harnessing human time and energy for addressing problems that computers cannot yet solve. Although computers have advanced dramatically in many respects over the last 50 years, they still do not possess the basic conceptual intelligence or perceptual capabilities...

  12. Human phantom

    CERN Multimedia

    CERN PhotoLab

    1973-01-01

    This human phantom has been received by CERN on loan from the State Committee of the USSR for the Utilization of Atomic Energy. It is used by the Health Physics Group to study personel radiation doses near the accelerators.

  13. Human expunction

    Science.gov (United States)

    Klee, Robert

    2017-10-01

    Thomas Nagel in `The Absurd' (Nagel 1971) mentions the future expunction of the human species as a `metaphor' for our ability to see our lives from the outside, which he claims is one source of our sense of life's absurdity. I argue that the future expunction (not to be confused with extinction) of everything human - indeed of everything biological in a terran sense - is not a mere metaphor but a physical certainty under the laws of nature. The causal processes by which human expunction will take place are presented in some empirical detail, so that philosophers cannot dismiss it as merely speculative. I also argue that appeals to anthropic principles or to forms of mystical cosmology are of no plausible avail in the face of human expunction under the laws of physics.

  14. Human brucellosis

    NARCIS (Netherlands)

    Franco, María Pía; Mulder, Maximilian; Gilman, Robert H.; Smits, Henk L.

    2007-01-01

    Human brucellosis still presents scientists and clinicians with several challenges, such as the understanding of pathogenic mechanisms of Brucella spp, the identification of markers for disease severity, progression, and treatment response, and the development of improved treatment regimens.

  15. Human Toxicity

    DEFF Research Database (Denmark)

    Jolliet, Olivier; Fantke, Peter

    2015-01-01

    This chapter reviews the human toxicological impacts of chemicals and how to assess these impacts in life cycle impact assessment (LCIA), in order to identify key processes and pollutants. The complete cause-effect pathway – from emissions of toxic substances up to damages on human health...... on characterisation factors means that results should by default be reported and interpreted in log scales when comparing scenarios or substance contribution! We conclude by outlining future trends in human toxicity modelling for LCIA, with promising developments for (a) better estimates of degradation halflives, (b......) the inclusion of ionization of chemicals in human exposure including bioaccumulation, (c) metal speciation, (d) spatialised models to differentiate the variability associated with spatialisation from the uncertainty, and (e) the assessment of chemical exposure via consumer products and occupational settings...

  16. Human ehrlichiosis

    Directory of Open Access Journals (Sweden)

    Đokić Milomir

    2006-01-01

    Full Text Available Background. Human ehrlichiosis is a newly recognized disease. It is a tick-borne disease caused by several bacterial species of the genhus Erlichia. These are small gram-negative pleomorphic cocci, that are obligatory intracellular bacteria. Tick Ixodes is the principle vector in Europe, and Amblyomma americanum in the United States. Bacterial organisms replicate in a tick, and are transmited from infected cells in a vector to the blood cells of animals or humans. Human ehrlichiosis is a name for a group of diseases caused by different species of Ehrlichia. One of them is the disease named human monocytic ehrlichiosis, caused by Ehrlichia chaffeensis, and the other is a human granulocytic ehrlichiosis caused by Anaplasma phagocytophilia. Case report. We reported a 23-year-old patient admitted for the clinical treatment with the symptoms of high febrility (above 40 °C, headache, vomiting, general weakness and exhaustion, but without data on a tick bite. The patient was treated with trimetoprim-sulfamethoxazole for a week when Ehrlichia chaffeensis was confirmed by the immunofluoroscence test, and the therapy contimed with doxacyclin. Conclusion. Human ehrlichiosis is also present in our country, so this disease should be considered everyday, especially in infectology practice.

  17. Structural Injury after Lithium Treatment in Human and Rat Kidney involves Glycogen Synthase Kinase-3β Positive Epithelium

    DEFF Research Database (Denmark)

    Kjærsgaard, Gitte; Madsen, Kirsten; Marcussen, Niels

    2011-01-01

    Lithium is reabsorbed by distal nephron segments in sodium depleted states. It was hypothesized that lithium causes permanent injury to the developing kidney particularly in the sodium-retaining phase around weaning through entry into epithelial cells of the distal nephron and inhibition of glyco......Lithium is reabsorbed by distal nephron segments in sodium depleted states. It was hypothesized that lithium causes permanent injury to the developing kidney particularly in the sodium-retaining phase around weaning through entry into epithelial cells of the distal nephron and inhibition...... of glycogen synthase kinase-3β (GSK-3β). GSK-3β and pGSK-3β was investigated in a developing series of rat kidney cortex and medulla. Li+ was given to female wistar rats with litters through food pellets at postnatal (P) days 7-28. In human fetal and adult kidney the expression of GSK-3β was examined and also....... Lithium causes proliferation, structural injury and increases inactive pGSK-3β abundance in these segments. The data are compatible with epithelial entry of lithium and a causal role for GSK-3β in postnatal developing cortical collecting duct epithelium....

  18. Interneurons and proprioneurons in the adult human spinal grey matter and in the general somatic and visceral afferent cranial nerve nuclei.

    Science.gov (United States)

    Abdel-Maguid, T E; Bowsher, D

    1984-08-01

    Using the classification of Abdel-Maguid & Bowsher (1984), interneurons of the dorsal horn of the grey matter of the human spinal cord and medulla oblongata were found to belong to only three 'families' of neurons, out of a possible thirteen. This is in itself one of the justifications for the method of classification. Functional identification of these human neurons has been made on the basis of topological, morphological and projectional comparison with known cells in other mammalian species. Among the cells identified are gelatinosal interneurons and Renshaw cells of laminae VII and VIII. Neurons belonging to the same 'family' as Waldeyer cells of lamina I continue around the outer edge of the grey matter, their dendrites forming a part of the boundary between grey and white matter. Interneurons with small and very small dendrite fields lie on interlaminar boundaries and have mediolaterally oriented dendrites, in contrast to the craniocaudally oriented dendritic field of most dorsal horn neurons. If such dendrites lying along interlaminar boundaries are also found to exist in other species, it may explain the abrupt change in physiological characteristics which is found on passing an electrode from one lamina to another.

  19. [Humanized childbirth].

    Science.gov (United States)

    Kuo, Su-Chen

    2005-06-01

    Childbirth is a major event in a family. The expectant parent's perception of the childbirth experience influences his or her development as a parent. Making childbirth a positive and satisfying experience for women is the responsibility of health care providers. Women want to have physical and emotional privacy during labor and delivery, and to experience both in a friendly, comfortable environment. For women expected to undergo normal deliveries, humanized childbirth is one accessible approach. This article explores the definition and evolution of humanized childbirth and the care practice that it involves. It also explores birth plans and birth experiences, and the improvements necessary to routine labor practices to enable women to participate in decision making about their childbirth experiences. The author emphasizes that when health-care providers recognize the value of humanized childbirth and make changes accordingly, the dignity of women's childbirth experiences will be enhanced.

  20. Human monkeypox.

    Science.gov (United States)

    McCollum, Andrea M; Damon, Inger K

    2014-01-01

    Human monkeypox is a zoonotic Orthopoxvirus with a presentation similar to smallpox. Clinical differentiation of the disease from smallpox and varicella is difficult. Laboratory diagnostics are principal components to identification and surveillance of disease, and new tests are needed for a more precise and rapid diagnosis. The majority of human infections occur in Central Africa, where surveillance in rural areas with poor infrastructure is difficult but can be accomplished with evidence-guided tools and educational materials to inform public health workers of important principles. Contemporary epidemiological studies are needed now that populations do not receive routine smallpox vaccination. New therapeutics and vaccines offer hope for the treatment and prevention of monkeypox; however, more research must be done before they are ready to be deployed in an endemic setting. There is a need for more research in the epidemiology, ecology, and biology of the virus in endemic areas to better understand and prevent human infections.

  1. Human mimicry

    NARCIS (Netherlands)

    Chartrand, T.L.; Baaren, R.B. van

    2009-01-01

    Human mimicry is ubiquitous, and often occurs without the awareness of the person mimicking or the person being mimicked. First, we briefly describe some of the major types of nonconscious mimicry—verbal, facial, emotional, and behavioral—and review the evidence for their automaticity. Next, we

  2. Practicing Humanities

    DEFF Research Database (Denmark)

    Gimmler, Antje

    2016-01-01

    and self-reflective democracy. Contemporary humanities have adopted a new orientation towards practices, and it is not clear how this fits with the ideals of ‘Bildung’ and ‘pure science’. A possible theoretical framework for this orientation towards practices could be found in John Dewey’s pragmatic...

  3. Human waste

    NARCIS (Netherlands)

    Amin, Md Nurul; Kroeze, Carolien; Strokal, Maryna

    2017-01-01

    Many people practice open defecation in south Asia. As a result, lot of human waste containing nutrients such as nitrogen (N) and phosphorus (P) enter rivers. Rivers transport these nutrients to coastal waters, resulting in marine pollution. This source of nutrient pollution is, however, ignored in

  4. Human Parasites

    OpenAIRE

    Davis, Ryan S.; Hodgson, Erin W.

    2008-01-01

    Entomologists often get “bug” samples for identification, including those that accidentally infest residences. In the United States, we are fortunate to have very few arthropods (e.g., insects, spiders, mites, ticks, etc.) that actually infest or feed on humans.

  5. Human steroidogenesis

    DEFF Research Database (Denmark)

    Andersen, Claus Y; Ezcurra, Diego

    2014-01-01

    reviews current knowledge of the regulation of progesterone in the human ovary during the follicular phase and highlights areas where knowledge remains limited. In this review, we provide in-depth information outlining the regulation and function of gonadotropins in the complicated area of steroidogenesis...

  6. Human Parechoviruses

    DEFF Research Database (Denmark)

    Fischer, Thea Kølsen; Harvala, Heli; Midgley, Sofie

    2017-01-01

    Infections with human parechoviruses (HPeV) are highly prevalent, particularly in neonates, where they may cause substantial morbidity and mortality. The clinical presentation of HPeV infection is often indistinguishable from that of enterovirus (EV) infection and may vary from mild disease...

  7. Nothing Human

    Science.gov (United States)

    Wharram, C. C.

    2014-01-01

    In this essay C. C. Wharram argues that Terence's concept of translation as a form of "contamination" anticipates recent developments in philosophy, ecology, and translation studies. Placing these divergent fields of inquiry into dialogue enables us read Terence's well-known statement "I am a human being--I deem nothing…

  8. Human Trafficking

    Science.gov (United States)

    Wilson, David McKay

    2011-01-01

    The shadowy, criminal nature of human trafficking makes evaluating its nature and scope difficult. The U.S. State Department and anti-trafficking groups estimate that worldwide some 27 million people are caught in a form of forced servitude today. Public awareness of modern-day slavery is gaining momentum thanks to new abolitionist efforts. Among…

  9. Human monkeypox.

    Science.gov (United States)

    Jezek, Z; Gromyko, A I; Szczeniowski, M V

    1983-01-01

    Human monkeypox, occurring in the tropical rainforest of west and central Africa, is regarded as the most important orthopoxvirus infection for epidemiological surveillance during the post-smallpox era. This disease, first recognized in Zaïre in 1970 resembles smallpox clinically but differs epidemiologically. Clinical features, their evolution and sequelae of monkeypox could be compared with discrete ordinary or modified type of smallpox. A case-fatality rate of 14% has been observed but some cases can be exceedingly mild or atypical and may easily remain undetected and unreported. Pronounced lymphadenopathy has been the only clinical feature found commonly in monkeypox but not in smallpox. Fifty-seven cases of human monkeypox have occurred since 1970, in the tropical rainforests in six west and central African countries, the majority of them (45) being reported from Zaïre. The disease appears to be more frequent in dry season. Children below ten years of age comprise 84% of the cases. Smallpox vaccination protects against monkeypox. Clusters of cases have been observed in certain areas within countries and within affected households. Human-to-human spread has possibly occurred seven times. No cases of possible tertiary spread were observed. The secondary attack rate among susceptible close household contacts was 10%, among all susceptible contacts 5%. This is much lower than that occurring with smallpox, which is between 25-40%. The limited avidity of monkeypox virus for human beings indicates that monkeypox is probably a zoonosis, although the animal reservoir(s) have not yet been identified. The low transmissibility, resulting in low frequency of disease in man indicates that monkeypox is not a public health problem. Human monkeypox has been a relatively newly recognized disease. Studies are in progress to identify the natural cycle of monkeypox virus and to define better its clinical and epidemiological characteristics. Special surveillance is maintained in

  10. Human Rights, Human Needs, Human Development, Human Security : Relationships between four international 'human' discourses

    NARCIS (Netherlands)

    D.R. Gasper (Des)

    2007-01-01

    textabstractHuman rights, human development and human security form increasingly important, partly interconnected, partly competitive and misunderstood ethical and policy discourses. Each tries to humanize a pre-existing and unavoidable major discourse of everyday life, policy and politics; each

  11. Paraoxonase-1 is only present in traceable amounts in seminal fluid and does not show any relationship with male subfertility.

    Science.gov (United States)

    Marsillach, Judit; Lafuente, Rafael; Checa, Miguel Angel; Maestre-Martínez, Carmen; Fabián, Enrique; Brassesco, Mario; Beltrán-Debón, Raúl; Aragonès, Gerard; Carreras, Ramon; Pedro-Botet, Juan; Joven, Jorge; Camps, Jordi

    2011-08-01

    Study Type - Aetiology (case series). 4. What's known on the subject? and What does the study add? Oxidative stress seems to be one of the biochemical causes of defective sperm function. Paraoxonases are antioxidant enzymes that degrade lipid peroxides. There is a paucity of data on the possible role played by these enzymes in the pathophysiology of male sub-fertility. The present study shows that testicular tissue of sub-fertile patients clearly expresses paraoxonases-1, 2, and 3. These findings suggest a role for these enzymes in the protection against lipid peroxidation inside the cell. However, the concentration and activity of paraoxonase-1 in semen are negligible and are probably the result of cellular catabolism, with no significant biological function. To characterise the immunohistochemical sites of paraoxonase (PON) 1, PON2 and PON3 in human testicular tissue, and to analyse PON1 levels in semen, aiming to investigate the role played by these enzymes in the pathophysiology of male subfertility. The present study was performed in 41 semen samples from normal donors and in 52 semen samples and ten testicle biopsies from patients who were being evaluated for causes of subfertility. Immunohistochemical analyses showed high levels of PON1 and PON3 expression in testicular tissue. PON2 expression was also detected, albeit at weaker levels. Oxidative stress indicators in biopsies were low and localized in some specific areas of the seminiferous tubules. PON1 was detected in seminal fluid at very low levels but with no significant differences between patients and controls. Receiver-operating characteristic analysis showed a low diagnostic power of semen PON1 levels. The present study shows high protein expression levels of PON1, PON2 and PON3 in testicular cells. The concentrations and activities of PON1 in semen are negligible and are probably the result of cellular catabolism, with no significant biological function in the testes. © 2010 THE AUTHORS; BJU

  12. Human Development Report 2000: Human Rights and Human Development

    OpenAIRE

    United Nations Development Programme, UNDP

    2000-01-01

    The Human Development Report 2000 looks at human rights as an intrinsic part of development—and at development as a means to realizing human rights. It shows how human rights bring principles of accountability and social justice to the process of human development.

  13. Human Rights in the Humanities

    Science.gov (United States)

    Harpham, Geoffrey

    2012-01-01

    Human rights are rapidly entering the academic curriculum, with programs appearing all over the country--including at Duke, Harvard, Northeastern, and Stanford Universities; the Massachusetts Institute of Technology; the Universities of Chicago, of Connecticut, of California at Berkeley, and of Minnesota; and Trinity College. Most of these…

  14. Human Protothecosis

    Science.gov (United States)

    Lass-Flörl, Cornelia; Mayr, Astrid

    2007-01-01

    Human protothecosis is a rare infection caused by members of the genus Prototheca. Prototheca species are generally considered to be achlorophyllic algae and are ubiquitous in nature. The occurrence of protothecosis can be local or disseminated and acute or chronic, with the latter being more common. Diseases have been classified as (i) cutaneous lesions, (ii) olecranon bursitis, or (iii) disseminated or systemic manifestations. Infections can occur in both immunocompetent and immunosuppressed patients, although more severe and disseminated infections tend to occur in immunocompromised individuals. Prototheca wickerhamii and Prototheca zopfii have been associated with human disease. Usually, treatment involves medical and surgical approaches; treatment failure is not uncommon. Antifungals such as ketoconazole, itraconazole, fluconazole, and amphotericin B are the most commonly used drugs to date. Among them, amphotericin B displays the best activity against Prototheca spp. Diagnosis is largely made upon detection of characteristic structures observed on histopathologic examination of tissue. PMID:17428884

  15. Human paleoneurology

    CERN Document Server

    2015-01-01

    The book presents an integrative review of paleoneurology, the study of endocranial morphology in fossil species. The main focus is on showing how computed methods can be used to support advances in evolutionary neuroanatomy, paleoanthropology and archaeology and how they have contributed to creating a completely new perspective in cognitive neuroscience. Moreover, thanks to its multidisciplinary approach, the book addresses students and researchers approaching human paleoneurology from different angles and for different purposes, such as biologists, physicians, anthropologists, archaeologists

  16. Human Cloning

    Science.gov (United States)

    2006-07-20

    research group, headed by Douglas Melton and Kevin Eggan, submitted their proposal to a Harvard committee composed of ethicists, scientists and public...United States. Although the company offered no proof of its claim, Dr . Brigette Boisselier, Managing Director of Clonaid, stated that genetic tests would...a year of the Dolly announcement, concerns over human cloning were heightened when Dr . Richard Seed, a Chicago scientist, announced on January 7

  17. Human universe

    CERN Document Server

    Cox, Brian

    2014-01-01

    Human life is a staggeringly strange thing. On the surface of a ball of rock falling around a nuclear fireball in the blackness of a vacuum the laws of nature conspired to create a naked ape that can look up at the stars and wonder where it came from. What is a human being? Objectively, nothing of consequence. Particles of dust in an infinite arena, present for an instant in eternity. Clumps of atoms in a universe with more galaxies than people. And yet a human being is necessary for the question itself to exist, and the presence of a question in the universe - any question - is the most wonderful thing. Questions require minds, and minds bring meaning. What is meaning? I don't know, except that the universe and every pointless speck inside it means something to me. I am astonished by the existence of a single atom, and find my civilisation to be an outrageous imprint on reality. I don't understand it. Nobody does, but it makes me smile. This book asks questions about our origins, our destiny, and our place i...

  18. Human Being Human: Culture and the Soul

    OpenAIRE

    Hauke, Chris

    2005-01-01

    Human Being Human explores the classical question 'What is a human being?'\\ud \\ud In examining our human being, Christopher Hauke challenges the notion of human nature, questions the assumed superiority of human consciousness and rational thinking and pays close attention to the contradiction of living simultaneously as an autonomous individual and a member of the collective community. The main chapters include:\\ud \\ud who's in charge here?\\ud knowledge power and human being\\ud that thinking ...

  19. Introduction: Digital Humanities, Public Humanities

    Directory of Open Access Journals (Sweden)

    Alex Christie

    2014-07-01

    Full Text Available NANO: New American Notes Online: An Interdisciplinary Academic Journal for Big Ideas in a Small World. This special issue shows how both public and digital humanities research can be rendered more persuasive through engagement with cultures beyond the academy. More specifically, the aim of this special issue is to demonstrate how investments in technologies and computation are not necessarily antithetical to investments in critical theory and social justice.

  20. Human Computing, Virtual Humans and Artificial Imperfection

    NARCIS (Netherlands)

    Ruttkay, Z.M.; Reidsma, Dennis; Nijholt, Antinus; Quek, F.; Yang, Y.

    2006-01-01

    In this paper we raise the issue whether imperfections, characteristic of human-human communication, should be taken into account when developing virtual humans. We argue that endowing virtual humans with the imperfections of humans can help making them more ‘comfortable’ to interact with. That is,

  1. Human Capital, (Human) Capabilities and Higher Education

    Science.gov (United States)

    Le Grange, L.

    2011-01-01

    In this article I initiate a debate into the (de)merits of human capital theory and human capability theory and discuss implications of the debate for higher education. Human capital theory holds that economic growth depends on investment in education and that economic growth is the basis for improving the quality of human life. Human capable…

  2. Humanizing Architecture

    DEFF Research Database (Denmark)

    Toft, Tanya Søndergaard

    2015-01-01

    The article proposes the urban digital gallery as an opportunity to explore the relationship between ‘human’ and ‘technology,’ through the programming of media architecture. It takes a curatorial perspective when proposing an ontological shift from considering media facades as visual spectacles...... agency and a sense of being by way of dematerializing architecture. This is achieved by way of programming the symbolic to provide new emotional realizations and situations of enlightenment in the public audience. This reflects a greater potential to humanize the digital in media architecture....

  3. Think Human

    DEFF Research Database (Denmark)

    Nielsen, Charlotte Marie Bisgaard

    2013-01-01

    The paper probes the background of the dire rhetoric of the Danish National Health Board’s 40 week anti-alcohol consumption campaign, in particular the model of communication implied by the campaign's strategy. Contrasting the campaign's strategy in 2011 with the results of evaluations of previous...... years' campaigns suggests that the theory of communication underlying the campaign has its basis in mechanical action rather than in human communication. The practice of 'Communication design' is investigated in relation to this metaphorical 'machine thinking' model of communication and contrasted...

  4. Generation and Characterization of Novel Local and Metastatic Human Neuroblastoma Variants

    Directory of Open Access Journals (Sweden)

    Ido Nevo

    2008-08-01

    Full Text Available Neuroblastoma (NB is the most commonly occurring solid tumor in children. The disease usually arises in the adrenal medulla, and it is characterized by a remarkable heterogeneity in its progression. Most NB patients with an advanced disease have massive bone marrow infiltration at diagnosis. Lung metastasis represents a widely disseminated stage and is typically considered to be a terminal event. Much like other malignancies, NB progression is a complex, multistep process. The expression, function, and significance of the various factors involved in NB progression must be studied in relevant in vivo and in vitro models. Currently, models consisting of metastatic and nonmetastatic cell variants of the same genetic background exist for several types of cancer; however, none exists for NB. In the present study, we describe the generation of a NB metastasis model. SH-SY5Y and MHH-NB-11 NB cells were inoculated orthotopically into the adrenal glands of athymic nude mice. Neuroblastoma cells metastasizing to the lungs were isolated from mice bearing adrenal tumors. Lung metastatic variants were generated by repeated cycles of in vivo passage. Characterization of these variants included cellular morphology and immunophenotyping in vitro, aggressiveness in vivo, and various biologic parameters in vitro. The NB metastatic variant in each model displayed unique properties, and both metastatic variants demonstrated a metastatic phenotype in vivo. These reproducible models of human NB metastasis will serve as an unlimited source of transcriptomic and proteomic material. Such models can facilitate future studies on NB metastasis and the identification of novel NB biomarkers and targets for therapy.

  5. Brain circuits for mating behavior in cats and brain activations and de-activations during sexual stimulation and ejaculation and orgasm in humans.

    Science.gov (United States)

    Holstege, Gert; Huynh, Hieu K

    2011-05-01

    In cats, there exists a descending system that controls the posture necessary for mating behavior. A key role is played by the mesencephalic periaqueductal gray (PAG), which maintains strong specific projections to the nucleus retroambiguus located laterally in the most caudal medulla. The NRA, in turn, has direct access to motoneurons in the lumbosacral cord that produce the mating posture. This pathway is slightly different in males and females, but in females its strength fluctuates strongly depending on whether or not the cat is in heat. This way the PAG determines whether or not mating can take place. Via the PAG many other regions in the limbic system as well as in the prefrontal cortex and insula can influence mating behavior. In humans, the brain also controls responses to sexual stimulation as well as ejaculation in men and orgasm in women. Neuroimaging techniques show activations and de-activations but are not able to verify whether the PAG has a similar effect as in cats. PET-scanning results revealed that there is activation in the upper brainstem and cerebellum, as well as insula in men and in the somatomotor and somatosensory cortex in women. During sexual stimulation, but especially during ejaculation and orgasm there was strong de-activation mainly on the left side in the temporal lobe and ventral prefrontal cortex. These neuroimaging results show the importance of lowering the level of alertness regarding your immediate environment (left hemisphere) to have proper sexual behavior. Copyright © 2011 Elsevier Inc. All rights reserved.

  6. Quantification of human brain benzodiazepine receptors using [{sup 18}F]fluoroethylflumazenil: a first report in volunteers and epileptic patients

    Energy Technology Data Exchange (ETDEWEB)

    Leveque, Philippe [Unite de Tomographie par Positrons, Universite Catholique de Louvain, Louvain-la-Neuve (Belgium); Unite de Chimie Pharmaceutique et de Radiopharmacie, CMFA/REMA, Universite Catholique de Louvain, 73-40 Avenue Mounier, 1200, Bruxelles (Belgium); Sanabria-Bohorquez, Sandra [Imaging Research, Merck Research Laboratories, West Point, Philadelphia (United States); Bol, Anne; Volder, Anne de; Labar, Daniel [Unite de Tomographie par Positrons, Universite Catholique de Louvain, Louvain-la-Neuve (Belgium); Rijckevorsel, K. van [Service de Neurologie, Cliniques Universitaires Saint-Luc, Bruxelles (Belgium); Gallez, Bernard [Unite de Chimie Pharmaceutique et de Radiopharmacie, CMFA/REMA, Universite Catholique de Louvain, 73-40 Avenue Mounier, 1200, Bruxelles (Belgium); Unite de Resonance Magnetique Biomedicale, Universite Catholique de Louvain, Bruxelles (Belgium)

    2003-12-01

    Fluorine-18 fluoroethylflumazenil ([{sup 18}F]FEF) is a tracer for central benzodiazepine (BZ) receptors which is proposed as an alternative to carbon-11 flumazenil for in vivo imaging using positron emission tomography (PET) in humans. In this study, [{sup 18}F]FEF kinetic data were acquired using a 60-min two-injection protocol on three normal subjects and two patients suffering from mesiotemporal epilepsy as demonstrated by abnormal magnetic resonance imaging and [{sup 18}F]fluorodeoxyglucose positron emission tomography. First, a tracer bolus injection was performed and [{sup 18}F]FEF rapidly distributed in the brain according to the known BZ receptor distribution. Thirty minutes later a displacement injection of 0.01 mg/kg of unlabelled flumazenil was performed. Activity was rapidly displaced from all BZ receptor regions demonstrating the specific binding of [{sup 18}F]FEF. No displacement was observed in the pons. Plasma input function was obtained from arterial blood sampling, and metabolite analysis was performed by high-performance liquid chromatography. Metabolite quantification revealed a fast decrease in tracer plasma concentration, such that at 5 min post injection about 70% of the total radioactivity in plasma corresponded to [{sup 18}F]FEF, reaching 24% at 30 min post injection. The interactions between [{sup 18}F]FEF and BZ receptors were described using linear compartmental models with plasma input and reference tissue approaches. Binding potential values were in agreement with the known distribution of BZ receptors in human brain. Finally, in two patients with mesiotemporal sclerosis, reduced uptake of [{sup 18}F]FEF was clearly observed in the implicated left hippocampus. (orig.)

  7. Human Factors Planning Guidelines

    Science.gov (United States)

    1996-01-01

    To ensure human factors considerations are fully incorporated in the system : development, the Integrated Product Team (IPT) or Program Manager initiates a : Human Factors Program (HFP) that addresses the human performance and human : resource parame...

  8. Amidated joining peptide in the human pituitary, gut, adrenal gland and bronchial carcinoids. Immunocytochemical and immunochemical evidence

    DEFF Research Database (Denmark)

    Bjartell, A; Fenger, M; Ekman, R

    1990-01-01

    .g., ACTH, beta-endorphin, Pro-tau-MSH, in the pituitary gland and adrenal medulla. The JP-N immunoreactive cells in the adrenal medulla were identified as a subpopulation of adrenaline-producing cells by means of an antiserum against phenylethanolamine N-methyltransferase. In the gut immunoreactive JP......-N was costored with somatostatin in endocrine cells. Using radioimmunoassay, JP-N was found in higher concentrations than ACTH and alpha-MSH in the gut but not in the adrenal gland. Gel chromatography of gastric antrum and adrenal gland extracts showed three and two dominating components of immunoreactive JP...

  9. The Digital Humanities as a Humanities Project

    Science.gov (United States)

    Svensson, Patrik

    2012-01-01

    This article argues that the digital humanities can be seen as a humanities project in a time of significant change in the academy. The background is a number of scholarly, educational and technical challenges, the multiple epistemic traditions linked to the digital humanities, the potential reach of the field across and outside the humanities,…

  10. NATO Human View Architecture and Human Networks

    Science.gov (United States)

    Handley, Holly A. H.; Houston, Nancy P.

    2010-01-01

    The NATO Human View is a system architectural viewpoint that focuses on the human as part of a system. Its purpose is to capture the human requirements and to inform on how the human impacts the system design. The viewpoint contains seven static models that include different aspects of the human element, such as roles, tasks, constraints, training and metrics. It also includes a Human Dynamics component to perform simulations of the human system under design. One of the static models, termed Human Networks, focuses on the human-to-human communication patterns that occur as a result of ad hoc or deliberate team formation, especially teams distributed across space and time. Parameters of human teams that effect system performance can be captured in this model. Human centered aspects of networks, such as differences in operational tempo (sense of urgency), priorities (common goal), and team history (knowledge of the other team members), can be incorporated. The information captured in the Human Network static model can then be included in the Human Dynamics component so that the impact of distributed teams is represented in the simulation. As the NATO militaries transform to a more networked force, the Human View architecture is an important tool that can be used to make recommendations on the proper mix of technological innovations and human interactions.

  11. Serum paraoxonase-3 concentration is associated with insulin sensitivity in peripheral artery disease and with inflammation in coronary artery disease.

    Science.gov (United States)

    Rull, Anna; García, Raúl; Fernández-Sender, Laura; García-Heredia, Anabel; Aragonès, Gerard; Beltrán-Debón, Raúl; Marsillach, Judit; Alegret, Josep M; Martín-Paredero, Vicente; Mackness, Bharti; Mackness, Michael; Joven, Jorge; Camps, Jordi

    2012-02-01

    There are no data on the relationship between serum paraoxonase-3 (PON3) concentration and atherosclerosis in humans. Our aim was to investigate possible associations, using recently developed methods, in patients with peripheral artery disease (PAD) or coronary artery disease (CAD). We studied 118 PAD and 72 CAD patients and 175 healthy volunteers. Serum PON3 was determined by in-house ELISA using polyclonal antibodies generated against a synthetic peptide with a sequence specific to PON3. Polymorphisms of the PON3 promoter were analysed by the Iplex Gold MassArray™ method. There was a significant increase in serum PON3 concentration in both groups of patients with respect to the control group. In PAD patients, we observed significant positive correlations between PON3, insulin levels and HOMA index. These associations were not observed in CAD. There were significant positive associations between serum PON3 and β-2-microglobulin, CCL2 and high-sensitivity C-reactive protein in CAD patients, but not in PAD. We did not find any significant differences in PON3 gene promoter polymorphisms and their haplotypes between patients and controls, indicating that associations were not genetically determined. In both atherosclerotic phenotypes, serum PON3 concentration was increased, but this was associated with decreased insulin sensitivity in PAD and with inflammation in CAD. Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.

  12. Digital Humanities

    DEFF Research Database (Denmark)

    Nielsen, Hans Jørn

    2015-01-01

    overgangen fra trykkekultur til digital kultur. For det første problemstillingen omkring digitalisering af litterær kulturarv med fokus på kodning og tagging af teksten samt organisering i hypertekststrukturer. For det andet reorganiseringen af det digitale dokument i dataelementer og database. For det......Artiklen præsenterer først nogle generelle problemstillinger omkring Digital Humanities (DH) med det formål at undersøge dem nærmere i relation til konkrete eksempler på forskellige digitaliseringsmåder og ændringer i dokumentproduktion. I en nærmere afgrænsning vælger artiklen den tendens i DH......, der betragter DH som forbundet med "making" og "building" af digitale objekter og former. Dette kan også karakteriseres som DH som praktisk-produktiv vending. Artiklen har valgt tre typer af digitalisering. De er valgt ud fra, at de skal repræsentere forskellige måder at håndtere digitaliseringen på...

  13. Human Rhinoviruses

    Science.gov (United States)

    Lamson, Daryl M.; St. George, Kirsten; Walsh, Thomas J.

    2013-01-01

    Human rhinoviruses (HRVs), first discovered in the 1950s, are responsible for more than one-half of cold-like illnesses and cost billions of dollars annually in medical visits and missed days of work. Advances in molecular methods have enhanced our understanding of the genomic structure of HRV and have led to the characterization of three genetically distinct HRV groups, designated groups A, B, and C, within the genus Enterovirus and the family Picornaviridae. HRVs are traditionally associated with upper respiratory tract infection, otitis media, and sinusitis. In recent years, the increasing implementation of PCR assays for respiratory virus detection in clinical laboratories has facilitated the recognition of HRV as a lower respiratory tract pathogen, particularly in patients with asthma, infants, elderly patients, and immunocompromised hosts. Cultured isolates of HRV remain important for studies of viral characteristics and disease pathogenesis. Indeed, whether the clinical manifestations of HRV are related directly to viral pathogenicity or secondary to the host immune response is the subject of ongoing research. There are currently no approved antiviral therapies for HRVs, and treatment remains primarily supportive. This review provides a comprehensive, up-to-date assessment of the basic virology, pathogenesis, clinical epidemiology, and laboratory features of and treatment and prevention strategies for HRVs. PMID:23297263

  14. An autopsied case of adult-onset bulbospinalform Alexander disease with a novel S393R mutation in the GFAP gene.

    Science.gov (United States)

    Iwasaki, Yasushi; Saito, Yufuko; Mori, Keiko; Ito, Masumi; Mimuro, Maya; Aiba, Ikuko; Saito, Kozo; Mizuta, Ikuko; Yoshida, Tomokatsu; Nakagawa, Masanori; Yoshida, Mari

    2015-01-01

    A 50-year-old Japanese man with no apparent family history noticed diplopia. He gradually showed gait disturbance and dysuria. Abducens disorder of eye movement with nystagmus, tongue atrophy with fasciculation, spastic tetraparesis, and sensory disturbance were also observed. MRI showed severe atrophy of the medulla oblongata to the cervical cord ("tadpole appearance"). Tracheotomy and gastrostomy were performed 7 years after onset due to the development of bulbar palsy. Death occurred following respiratory failure after 11 years total disease duration. The brain weighed 1,380 g. The cerebrum, cerebellum, midbrain, and upper pons were preserved from atrophy, but the medulla oblongata to the cervical cord showed severe atrophy. A few Rosenthal fibers were observed in the cerebral white matter, basal ganglia, and cerebellum, whereas numerous Rosenthal fibers were observed in the medulla oblongata to the cervical cord. Myelin loss with relatively preserved axons was extensively observed from the middle of the pons to the spinal cord. The clinicopathological diagnosis was adult-onset bulbospinal-form Alexander disease. Glial fibrillary acidic protein (GFAP) gene analysis revealed a novel mutation of S393R. Expression patterns of S393R mutant GFAP using adrenal carcinoma-derived cells (SW13 cells) showed a decreased number of filamentous structures and abnormal aggregates.

  15. Hypocretin Receptor Expression in Canine and Murine Narcolepsy Models and in Hypocretin-Ligand Deficient Human Narcolepsy

    Science.gov (United States)

    Mishima, Kazuo; Fujiki, Nobuhiro; Yoshida, Yasushi; Sakurai, Takeshi; Honda, Makoto; Mignot, Emmanuel; Nishino, Seiji

    2008-01-01

    Study Objective: To determine whether hypocretin receptor gene (hcrtR1 and hcrtR2) expression is affected after long-term hypocretin ligand loss in humans and animal models of narcolepsy. Design: Animal and human study. We measured hcrtR1 and hcrtR2 expression in the frontal cortex and pons using the RT-PCR method in murine models (8-week-old and 27-week-old orexin/ataxin-3 transgenic (TG) hypocretin cell ablated mice and wild-type mice from the same litter, 10 mice for each group), in canine models (8 genetically narcoleptic Dobermans with null mutations in the hcrtR2, 9 control Dobermans, 3 sporadic ligand-deficient narcoleptics, and 4 small breed controls), and in humans (5 narcolepsy-cataplexy patients with hypocretin deficiency (average age 77.0 years) and 5 control subjects (72.6 years). Measurement and Results: 27-week-old (but not 8-week-old) TG mice showed significant decreases in hcrtR1 expression, suggesting the influence of the long-term ligand loss on the receptor expression. Both sporadic narcoleptic dogs and human narcolepsy-cataplexy subjects showed a significant decrease in hcrtR1 expression, while declines in hcrtR2 expression were not significant in these cases. HcrtR2-mutated narcoleptic Dobermans (with normal ligand production) showed no alteration in hcrtR1 expression. Conclusions: Moderate declines in hcrtR expressions, possibly due to long-term postnatal loss of ligand production, were observed in hypocretin-ligand deficient narcoleptic subjects. These declines are not likely to be progressive and complete. The relative preservation of hcrtR2 expression also suggests that hypocretin based therapies are likely to be a viable therapeutic options in human narcolepsy-cataplexy. Citation: Mishima K; Fujiki N; Yoshida Y; Sakurai T; Honda M; Mignot E; Nishino S. Hypocretin receptor expression in canine and murine narcolepsy models and in hypocretin-ligand deficient human narcolepsy. SLEEP 2008;31(8):1119-1126. PMID:18714784

  16. Human Factors in Human-Systems Integration

    Science.gov (United States)

    Fitts, David J.; Sandor, Aniko; Litaker, Harry L., Jr.; Tillman, Barry

    2008-01-01

    Any large organization whose mission is to design and develop systems for humans, and train humans needs a well-developed integration and process plan to deal with the challenges that arise from managing multiple subsystems. Human capabilities, skills, and needs must be considered early in the design and development process, and must be continuously considered throughout the development lifecycle. This integration of human needs within system design is typically formalized through a Human-Systems Integration (HSI) program. By having an HSI program, an institution or organization can reduce lifecycle costs and increase the efficiency, usability, and quality of its products because human needs have been considered from the beginning.

  17. [Ultrastructural study of the interstitial cells of the internal kidney medulla exposed to indomethacin].

    Science.gov (United States)

    Anavi, B; Dragiev, M

    1981-01-01

    Unusual cylindrical bodies-megatubules, which get in touch with lipid granules with granular endoplasmatic reticulum among themselves and with the pores of the nuclear and cellular membrane, are described in the interstitial cells of the kidneys of the control rats. After a suppression of prostaglandin synthesis with indomethacin (5 mg/kg venously of intraperitonealy per day for 6 days) there was statistically significant increase of the mass of the compact lipids in the interstitial cells (hypergranulation as the volume of the granule was preserved) - a proof that the granules contained precursors of renal prostaglandins. The nuclei were presented with round contours, while the perinuclear spaces were narrowed. The Goldgi apparatus and granular endoplasmic reticulum hyperthrophied. The megatubules atrophied. The authors suggest that they have prostaglandin synthetase activity.

  18. Role of liver nerves and adrenal medulla in glucose turnover of running rats

    DEFF Research Database (Denmark)

    Sonne, B; Mikines, K J; Richter, Erik

    1985-01-01

    . Compensatory changes in hormone or substrate levels explaining the lack of effect of liver denervation were not found. In rats with intact adrenals, the plasma epinephrine concentration was increased after 2.5 min of running. It is concluded that, in rats carrying out exercise of moderate intensity...

  19. Naloxone application to the ventrolateral medulla enhances the respiratory response to inspired carbon dioxide

    Energy Technology Data Exchange (ETDEWEB)

    Trouth, C.O.; Bada, F.J.; Pan, Yi; Holloway, J.A.; Millis, R.M.; Bernard, D.G. (Howard Univ., Washington, D.C. (USA))

    1991-01-01

    Previous studies have shown that systemic administration of the opiate antagonist naloxone potentiates the ventilatory response to inspired carbon dioxide. The present study was designed to localize the site of action of naloxone for increasing the respiratory chemosensitivity to inhaled carbon dioxide (CO{sub 2}) in cats. Naloxone applied topically to the caudal chemosensitive area on the ventral medullary surface (VMS) during hypercapnic breathing produced a 75% greater increase in minute ventilation than hypercapnic breathing alone. Furthermore, hypercapnic breathing produced a 200% increase in neuronal activity of VMS chemosensitive cells; this was further increased 120% by naloxone. It is concluded that naloxone increases the sensitivity of neurons in the caudal respiratory chemosensitive area of cats to hypercapnia, and that endogenous opiates may act as modulators at VMS chemosensitive sites during hypercapnic breathing.

  20. Targeted delivery of solutes and oxygen in the renal medulla: role of microvessel architecture

    OpenAIRE

    Pannabecker, Thomas L.; Layton, Anita T.

    2014-01-01

    Renal medullary function is characterized by corticopapillary concentration gradients of various molecules. One example is the generally decreasing axial gradient in oxygen tension (Po2). Another example, found in animals in the antidiuretic state, is a generally increasing axial solute gradient, consisting mostly of NaCl and urea. This osmolality gradient, which plays a principal role in the urine concentrating mechanism, is generally considered to involve countercurrent multiplication and c...

  1. Plasticity of the pain control system induced by neuropathic pain : the amygdala-medulla system

    OpenAIRE

    Gonçalves, Leonor

    2009-01-01

    Tese de doutoramento em Ciências da Saúde (ramo de conhecimento em Ciências Biológicas e Biomédicas) Pain is a multidimensional experience with sensory-discriminative and motivational-affective dimensions. Neuropathic pain is caused by a primary lesion or dysfunction of the nervous tissue that leads to an anomalous nociceptive processing in pain centers. It results from a process of peripheral and central sensitization and is characterized by prolonged hyperalgesia, allodynia and ...

  2. Role of the Rostral Ventrolateral Medulla in the Arterial Hypertension in Chronic Renal Failure

    Directory of Open Access Journals (Sweden)

    Adriana P. Castilho Dugaich

    2010-01-01

    Full Text Available Sympathetic activation in chronic renal failure (CRF is a major mechanism leading to the progression of renal disease and hypertension. In the present study, we tested the hypothesis that in CRF increased reactive oxygen species (ROS production in the RVLM mediated by enhanced circulating Angiotensin II (Ang II is an important mechanism leading to hypertension in CRF. In CRF rats we found an increase in the abundance of p47phox and gp91phox mRNA within the RVLM associated with a reduction of Ang II type 1 receptors (AT1 mRNA in the brainstem compared to controls (C. Tempol but not candesartan into the RVLM decreased MAP in CRF but not in C rats. GABA into the RVLM decreased MAP in CRF (63±8 mmHg more intensely than in C (33±3 mmHg. The results suggest that increased oxidative stress within the RVLM has an important participation to maintain hypertension in CRF rats apparently independently of AT1 Ang II receptors.

  3. Effects of streptomycin and neomycin on the adrenal medulla of dogs.

    Science.gov (United States)

    Corrado, A P; Guimarães, A F; Prado, W A

    1984-01-01

    The blocking effects of streptomycin and neomycin upon adrenal neurotransmission were studied in dogs. The pressor responses to splanchnic nerve stimulation (SNS) or 50 micrograms/kg nicotine were both blocked by 100 mg/kg but not by 50 mg/kg of the antibiotics injected systemically through the femoral vein. The effect was reversed by intravenous infusion of calcium chloride. The pressor response to SNS, but not that to nicotine, was blocked by the antibiotics injected into the adrenal gland through the adrenolumbar vein at doses up to 10 mg/kg. This effect was reversed by 50 micrograms/kg calcium chloride. Higher doses of antibiotics blocked the response to both stimuli, with only the response to nicotine being reversed by calcium chloride. These data indicate that streptomycin and neomycin block adrenal neurotransmission by interfering with calcium ions at pre- or pre-plus postsynaptic levels depending on the dose and route of administration.

  4. Demeclocycline Attenuates Hyponatremia by Reducing Aquaporin-2 Expression in the Renal Inner Medulla

    DEFF Research Database (Denmark)

    Kortenoeven, Marleen L. A.; Sinke, Anne P.; Hadrup, Niels

    2013-01-01

    Binding of vasopressin to its type-2 receptor in renal collecting ducts induces cAMP signaling, transcription and translocation of aquaporin-2 (AQP2) water channels to the plasma membrane and water reabsorption from the pro-urine. Demeclocycline is currently used to treat hyponatremia in patients...

  5. Convergence of multiple pelvic organ inputs in the rat rostral medulla.

    Science.gov (United States)

    Kaddumi, Ezidin G; Hubscher, Charles H

    2006-04-15

    Electrophysiological recordings were used to investigate the degree of pelvic/visceral convergent inputs onto single medullary reticular formation (MRF) neurons. A total of 94 MRF neurons responsive to bilateral electrical stimulation of the pelvic nerve (PN) in 12 urethane-anaesthetized male rats were tested for responses to mechanical stimulation of the urinary bladder, urethra, colon and penis, and electrical stimulation of the dorsal nerve of the penis (DNP) and abdominal branches of the vagus. Responses to distension of the bladder were found for 51% (n = 48) of the MRF neurons tested. Of these 48, 71% responded to urethral infusion, 81% responded to colon distension, 100% responded to penile stimulation (and DNP), and 85% responded to vagal stimulation, with 62% responding to stimulation of all four of these territories. This high degree of visceral convergence (i.e. 62%) in a subset of PN-responsive MRF neurons is significantly greater than for the subset of PN-responsive MRF neurons that did not respond to urinary bladder distension (i.e. out of the 46 remaining neurons, none responded to all four of the other pelvic/visceral stimuli combined). These results suggest that the neurons processing information from the urinary bladder at this level of the neural axis are likely to be important for mediating interactions between different visceral organs for the coordination of multiple pelvic/visceral functions.

  6. Humane Education: An Overview.

    Science.gov (United States)

    Whitlock, Eileen S.; Westerlund, Stuart R.

    This booklet traces the historical development of human education as it has been instilled into the young people of America from colonial times to the present and provides a future prognosis of humaneness in the schools. Humane education promotes humane behavior and is an important part of the humane movement in the United States, although until…

  7. IVI human factors strategy

    Science.gov (United States)

    1999-11-01

    This document focuses on human factors research that supports the Intelligent Vehicle Initiative (IVI). The status of the problem areas within categories used often by the human factors community to organize human factors process is discussed. A simi...

  8. Human Factors Job Aid

    Science.gov (United States)

    1996-12-09

    The purpose of this Human Factors Job Aid is to serve as a desk reference for : human factors integration during system acquisition. The first chapter contains : an overview of the FAA human factors process in system acquisitions. The : remaining eig...

  9. The golden triangle of human dignity: human security, human development and human rights

    NARCIS (Netherlands)

    Gaay Fortman, B. de

    2004-01-01

    The success or failure of processes of democratization cannot be detached from processes of development related to the aspirations of people at the grassroots. Human rights, in a more theoretical terminology, require human development in order to enhance human security.

  10. Human-machine interactions

    Science.gov (United States)

    Forsythe, J Chris [Sandia Park, NM; Xavier, Patrick G [Albuquerque, NM; Abbott, Robert G [Albuquerque, NM; Brannon, Nathan G [Albuquerque, NM; Bernard, Michael L [Tijeras, NM; Speed, Ann E [Albuquerque, NM

    2009-04-28

    Digital technology utilizing a cognitive model based on human naturalistic decision-making processes, including pattern recognition and episodic memory, can reduce the dependency of human-machine interactions on the abilities of a human user and can enable a machine to more closely emulate human-like responses. Such a cognitive model can enable digital technology to use cognitive capacities fundamental to human-like communication and cooperation to interact with humans.

  11. Increasing follicular and stromal cell proliferation in cryopreserved human ovarian tissue after long-term precooling prior to freezing: in vitro versus chorioallantoic membrane (CAM) xenotransplantation.

    Science.gov (United States)

    Isachenko, Vladimir; Isachenko, Evgenia; Mallmann, Peter; Rahimi, Gohar

    2013-01-01

    A positive effect on the future development of cells, which have been cooled to low suprazero temperatures and then thawed, has been observed before and is not new. The aim of this study was to test the effectiveness of postthawing culture of human ovarian tissue, which was either frozen just after operative removal or cooled after removal to 5°C for 24 h before cryopreservation. Ovarian fragments from six patients were divided into small pieces in the form of cortex with medulla and randomly divided into the following four groups: Group 1 consisted of pieces that just after removal had been cultured in vitro for 8 days in a big volume of medium with mechanical agitation; Group 2 included pieces cooled after operation to 5°C for 24 h and then cultured in vitro for 8 days; Group 3 was comprised of pieces frozen-thawed just after operation and then cultured for 5 days in the chorioallantoic membrane (CAM) culture system; and the pieces in Group 4 were cooled after operation to 5°C for 24 h, frozen-thawed, and then cultured in the CAM system for 5 days. The effectiveness of the tissue culture was evaluated by the development of follicles and by the intensiveness of proliferation in the tissue (by expression of cytokeratin and Ki-67). For Groups 1, 2, 3, and 4, the mean densities of follicles per 1 mm(3) was 12.9, 12.2, 12.4, and 16.1, respectively (p1-2>0.1; p3-4ovarian tissue to 5°C before cryopreservation increases the viability of the cells in the tissue after thawing. Additionally, the efficacy of the CAM system for the culture of thawed human ovarian tissue was demonstrated.

  12. Relationship between age and brainstem allometry in the African grasscutter (Thryonomys swinderianus Temminck, 1827

    Directory of Open Access Journals (Sweden)

    Chikera S. Ibe

    2017-01-01

    Full Text Available Allometric values of brainstem structures were evaluated in African grasscutters Thryonomys swinderianus (n = 27. Brain samples were extracted from 9 animals each of 3 days (neonates, 72 days (juveniles and 450 days of age (adults. The midbrain, pons and medulla oblongata were separated from each brain sample and dimensions and weights obtained. The weights of the midbrain in the neonate, juvenile and adult African grasscutters were 0.33 g ± 0.01 g, 0.47 g ± 0.01 g and 0.93 g ± 0.02 g, respectively. The increase from neonate to juvenile (p = 0.002 and adult (p = 0.003 was significant. The pons lengths in the neonate, juvenile and adult were 2.05 mm ± 0.05 mm, 3.86 mm ± 0.05 mm and 4.16 mm ± 0.22 mm, respectively. There was a significant increase in the length of the pons from the neonate to the juvenile (p = 0.002, but the increase from the juvenile to the adult period was not significant (p = 0.263. There was also a significant (p < 0.05 increase in the weights and lengths of the medulla oblongata from neonate to juvenile and adult periods. In adults, the nose-rump length and the length of the medulla were significantly negatively correlated (r² = 0.47; p = 0.043. The present study concluded that the postnatal development of some brainstem structures in the African grasscutter varies with age.

  13. Special Section: Human Rights

    Science.gov (United States)

    Frydenlund, Knut; And Others

    1978-01-01

    Eleven articles examine human rights in Europe. Topics include unemployment, human rights legislation, role of the Council of Europe in promoting human rights, labor unions, migrant workers, human dignity in industralized societies, and international violence. Journal available from Council of Europe, Directorate of Press and Information, 67006…

  14. No evidence for the presence of oogonia in the human ovary after their final clearance during the first two years of life

    DEFF Research Database (Denmark)

    Byskov, A G; Høyer, P E; Andersen, Claus Yding

    2011-01-01

    -old) ovaries were processed for plastic sections. Serial sections were prepared for immunohistochemical detection of markers for oogonia: tyrosine kinase receptor for stem cell factor (SCF)(C-KIT), stage-specific embryonic antigen-4 (SSEA4), homeobox gene transcription factor (NANOG), octamer binding...... before 2 years, leaving only diplotene oocytes stained for C-KIT. From 18 wpc to 2 years, the medulla contained conglomerates of healthy and degenerating oogonia and small follicles, waste baskets (WBs) and oogonia enclosed in growing follicles (FWB). Medulla of older ovaries contained groups...

  15. Reduction in brain immunoreactive corticotropin-releasing factor (CRF) in spontaneously hypertensive rats

    Energy Technology Data Exchange (ETDEWEB)

    Hashimoto, K.; Hattori, T.; Murakami, K.; Suemaru, S.; Kawada, Y.; Kageyama, J.; Ota, Z.

    1985-02-18

    The brain CRF concentration of spontaneously hypertensive rats (SHR) and normotensive Wistar Kyoto rats (WKY) was examined by rat CRF radioimmunoassay. Anti-CRF serum was developed by immunizing rabbits with synthetic rat CRF. Synthetic rat CRF was also used as tracer and standard. The displacement of /sup 125/I-rat CRF by serially diluted extracts of male Wistar rats hypothalamus, thalamus, midbrain, pons, medulla oblongata, cerebral cortex, cerebellum and neurointermediate lobe was parallel to the displacement of synthetic rat CRF. In both WKY and SHR the highest levels of CRF immunoreactivity were shown by the hypothalamus and neurointermediate lobe, and considerable CRF immunoreactivity was also detected in other brain regions. The CRF immunoreactivity in the hypothalamus, neurointermediate lobe, midbrain, medulla oblongata and cerebral cortex was significantly reduced in SHR and it may suggest that CRF abnormality may be implicated in the reported abnormalities in the pituitary-adrenal axis, autonomic response and behavior of SHR.

  16. MRI measurements of the brain stem and cerebellum in high functioning autistic children

    Energy Technology Data Exchange (ETDEWEB)

    Hashimoto, Toshiaki; Tayama, Masanobu; Miyazaki, Masahito; Murakawa, Kazuyoshi; Kuroda, Yasuhiro (Tokushima Univ. (Japan). School of Medicine)

    1994-01-01

    To determine involvements of the brain stem and/or cerebellum in autism, we compared midsagittal magnetic resonance images of the brains of high functioning autistic children with those of normal controls. We found that the midbrain and medulla oblongata were significantly smaller in these autistic children than in the control children. The pons area did not differ between the two groups, nor was there any difference in the cerebellar vermis area. The ratio of the brain stem and cerebellum to the posterior fossa area did not differ significantly between the high functioning autistic and the control children. The development of the cerebellar vermis area was delayed in autistic children as compared with that in the control children. Thus, it was suggested that significant anatomical changes in the midbrain and medulla oblongata existed in the autistic children. (author).

  17. ISS Payload Human Factors

    Science.gov (United States)

    Ellenberger, Richard; Duvall, Laura; Dory, Jonathan

    2016-01-01

    The ISS Payload Human Factors Implementation Team (HFIT) is the Payload Developer's resource for Human Factors. HFIT is the interface between Payload Developers and ISS Payload Human Factors requirements in SSP 57000. ? HFIT provides recommendations on how to meet the Human Factors requirements and guidelines early in the design process. HFIT coordinates with the Payload Developer and Astronaut Office to find low cost solutions to Human Factors challenges for hardware operability issues.

  18. The paraoxonase-1 pathway is not a major bioactivation pathway of clopidogrel in vitro

    Science.gov (United States)

    Ancrenaz, V; Desmeules, J; James, R; Fontana, P; Reny, J-L; Dayer, P; Daali, Y

    2012-01-01

    BACKGROUND AND PURPOSE Clopidogrel is a prodrug bioactivated by cytochrome P450s (CYPs). More recently, paraoxonase-1 (PON1) has been proposed as a major contributor to clopidogrel metabolism. The purpose of this study was to assess the relative contribution of CYPs and PON1 to clopidogrel metabolism in vitro. EXPERIMENTAL APPROACH Clopidogrel metabolism was studied in human serum, recombinant PON1 enzyme (rePON1), pooled human liver microsomes (HLMs), HLMs with the CYP2C19*1/*1 genotype and HLMs with the CYP2C19*2/*2 genotype. Inhibition studies were also performed using specific CYP inhibitors and antibodies. Clopidogrel and its metabolites were measured using LC/MS/MS method. KEY RESULTS PON1 activity was highest in the human serum and there was no difference in PON1 activity between any of the HLM groups. The production of clopidogrel's active metabolite (clopidogrel-AM) from 2-oxo-clopidogrel in pooled HLMs was approximately 500 times that in serum. When 2-oxo-clopidogrel was incubated with rePON1, clopidogrel-AM was not detected. Clopidogrel-AM production from 2-oxo-clopidogrel was lower in CYP2C19*2/*2 HLMs compared with CYP2C19*1/*1 HLMs, while PON1 activity in HLMs with both genotypes was similar. Moreover, incubation with inhibitors of CYP3A, CYP2B6 and CYP2C19 significantly reduced clopidogrel bioactivation while a PON1 inhibitor, EDTA, had only a weak inhibitory effect. CONCLUSION AND IMPLICATIONS This in vitro study shows that the contribution of PON1 to clopidogrel metabolism is limited at clinically relevant concentrations. Moreover, CYP2C19, CYP2B6 and CYP3A play important roles in the bioactivation of clopidogrel. PMID:22428615

  19. Bayesian segmentation of brainstem structures in MRI

    DEFF Research Database (Denmark)

    Iglesias, Juan Eugenio; Van Leemput, Koen; Bhatt, Priyanka

    2015-01-01

    In this paper we present a method to segment four brainstem structures (midbrain, pons, medulla oblongata and superior cerebellar peduncle) from 3D brain MRI scans. The segmentation method relies on a probabilistic atlas of the brainstem and its neighboring brain structures. To build the atlas, we...... the brainstem structures in novel scans. Thanks to the generative nature of the scheme, the segmentation method is robust to changes in MRI contrast or acquisition hardware. Using cross validation, we show that the algorithm can segment the structures in previously unseen T1 and FLAIR scans with great accuracy...

  20. Computed tomography of the dog's brain: normal aspects and anatomical correlation; Tomografia computadorizada do encefalo do cao: aspectos da normalidade e correlacao anatomica

    Energy Technology Data Exchange (ETDEWEB)

    Lorigados, C.A.B., E-mail: clorigados@usp.br [Faculdades Metropolitanas Unidas (UniFMU), Sao Paulo, SP (Brazil); Pinto, A.C.B.F. [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Medicina Veterinaria e Zootecnia

    2013-06-15

    Normal tomographic images of dog's heads were obtained, aimed to familiarize them with the normal aspects of the brain and correlate these findings with the relevant anatomy of the region studied. Several anatomical structures, such as the parenchyma of the frontal, parietal, temporal and occipital lobes, the longitudinal fissure, the ventricular system, the cerebellum, the olfactory bulb, the corpus callosum, diencephalon, the pons, the medulla oblongata and the chiasmatic sulcus were directly identified or were related to neighboring structures which helped in their identification. (author)