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Sample records for capim-annoni-2 eragrostis plana

  1. Poder germinativo de sementes de capim-annoni-2 (Eragrostis plana Ness recuperadas em fezes de bovinos Germination of capim-annoni-2 (Eragrostis plana Ness seeds recovered in bovine feces

    Directory of Open Access Journals (Sweden)

    Celso Augusto Vargas Lisboa

    2009-03-01

    Full Text Available Objetivou-se com este trabalho avaliar o efeito do processo de digestão de bovinos sobre o poder germinativo de sementes de capim-annoni-2 (Eragrostisplana Ness recuperadas nas fezes. As sementes (6 g, 27.273 sementes foram colocadas no saco ventral do rúmem de oito novilhos fistulados, mantidos em gaiolas para ensaios metabólicos. Quarenta e três por cento das sementes fornecidas aos animais foram recuperadas nas fezes: aquelas recuperadas nos três primeiros dias corresponderam a 97,2% da quantidade de sementes fornecidas. Somente 7,2% das sementes recuperadas, equivalente a 3,1% da quantidade de sementes fornecidas, apresentaram viabilidade. O tempo de permanência no trato digestivo foi a principal causa do desaparecimento das sementes consumidas e da perda de seu poder germinativo. A ausência de sementes de capim-annoni-2 nas fezes ocorre a partir do oitavo dia após a ingestão, assim, bovinos devem permanecer em quarentena por sete dias em área livre de capim-annoni-2 para limpeza do trato digestivo.This work was carried out with the objective of evaluating the effect of the bovine digestion process on the germination capacity of the capim-annoni-2 (Eragrostisplana Ness seeds recovered in feces. The seeds (6 g, 27,273 seeds were placed in a ruminal ventral sack of eight fistulated steers kept in pen trial. Forthy-three percent of the offered seeds were recovered in the feces. Seeds recovered in the first three days corresponded to 97.2% of the offered seeds. Only 7.2% of the recovered seeds germinated and represented 3.1% of the offered seeds. The permanence time in the digestive trait was the main cause for the disappearance of consumed seeds and for the loss in their germination capacity. The absence of capim-annoni-2 seeds in the feces occurs in the eighth day after ingestion, then, bovines should be kept in quarantine for seven days in an area free of capim-annoni-2 seeds to clean their digestive trait.

  2. Controle de capim-annoni-2 (Eragrostis plana com herbicidas pré-emergentes em associação com diferentes métodos de manejo do campo nativo Control of South African lovegrass (Eragrostis plana in natural pastures using pre emergent herbicides and different vegetation management methods

    Directory of Open Access Journals (Sweden)

    I.C.G.R. Goulart

    2009-03-01

    Full Text Available A planta daninha capim-annoni-2 (Eragrostis plana é um dos principais limitantes ao desenvolvimento da pecuária extensiva no Sul do Brasil. Vários fatores dificultam o controle dessa espécie em condições de pastagem natural. O objetivo deste trabalho foi avaliar o controle de capim-annoni-2 por meio de herbicidas aplicados em pré-emergência que possam apresentar seletividade de posição no solo à pastagem nativa. Dois experimentos foram realizados neste estudo. O primeiro foi conduzido em casa de vegetação, onde sementes de capim-annoni-2 foram semeadas em vasos. O delineamento utilizado foi o completamente casualizado com seis repetições. Os herbicidas avaliados foram alachlor, ametryne, ametryne + tebuthiuron, atrazine, clomazone, diuron, flumioxazin, imazaquin, mesotrione, metribuzin, oxadiazon, S-metolachlor, sulfentrazone, terbuthylazine e trifluralin. Todos os produtos controlaram satisfatoriamente o capim-annoni-2. O segundo experimento foi conduzido em campo nativo com alta infestação de capim-annoni-2, em delineamento de blocos completamente casualizados, em esquema de parcelas subsubdivididas. Nas parcelas principais foram alocados os tratamentos de manejo da vegetação em antecedência a aplicação dos herbicidas: fogo técnico e roçada em altura alta e baixa; nas subparcelas, as doses dos herbicidas: 75 e 100% da dose de rótulo; e, nas subsubparcelas, os herbicidas atrazine, flumioxazin, mesotrione, S-metolachlor, sulfentrazone, trifluralin e testemunha não tratada. Nenhum dos herbicidas testados controlou efetivamente o capim-annoni-2 em campo, provavelmente devido à grande presença de plantas perenizadas. No entanto, os efeitos dos herbicidas foram mais pronunciados quando associados a fogo técnico e roçada baixa.The weed South African lovegrass (Eragrostis plana is one of the most important problems of rangelands and native pastures in southern Brazil. Several factors have limited its management in these

  3. Comportamento ingestivo diurno de vacas primíparas em pastagem nativa dominada por capim-annoni-2 com suplementação proteica e mineral em diversas estações climáticas Diurnal ingestive behaviour of pregnant heifers grazing on natural grasslands invaded by Eragrostis plana Ness as affected by protein and mineral supplements in the different climatic seasons

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    Silvane Barcelos Carlotto

    2010-03-01

    Full Text Available Avaliou-se a influência da suplementação proteica e mineral sobre o comportamento ingestivo de vacas primíparas em pastagem nativa dominada por capim-annoni-2 (Eragrostis plana Ness recebendo suplementação com sal comum; sal mineral; sal proteinado; ou sal para reprodução e sal proteinado (1:1. Testou-se a hipótese de que suplementos minerais e proteinados pudessem promover alterações no comportamento ingestivo dos animais em pastejo. O estudo foi desenvolvido em uma área de 37 ha de pastagem nativa invadida por capim-annoni-2, dividida em oito potreiros (unidades experimentais. Os animais foram avaliados no período diurno, por dois dias consecutivos, em cada uma das estações climáticas, de abril de 2006 a março de 2007. O delineamento experimental foi inteiramente casualizado com duas repetições. Os tempos de pastejo, de ruminação, de ócio e de outras atividades não diferiram entre suplementos, e os valores médios diários para essas atividades foram 505, 108, 70 e 11 minutos, respectivamente. Os tempos de pastejo, ruminação e ócio e a taxa de bocados diferiram significativamente entre as estações climáticas. A suplementação proteica e mineral não promove alterações significativas no comportamento ingestivo dos animais. O comportamento ingestivo, no entanto, é influenciado pelas estações climáticas.The influence was assessed of protein and mineral supplementation on the ingestive behavior of pregnant heifers on a native grassland dominated by capim-annoni-2 (Eragrostis plana Ness supplementation with common salt, mineral salt, protein salt and protein salt and reproduction salt (1:1. The hypothesis was tested that different mineral and protein salt supplements could promote alterations in the animal grazing ingestive behavior. The study was carried out in a 37 ha area of native pasture invaded by capim-annoni-2, divided into 8 paddocks (experimental units. The animals were evaluated during the daylight

  4. Seed longevity of Eragrostis plana Nees buried in natural grassland soil

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    Renato Borges de Medeiros

    2014-11-01

    Full Text Available The objective of this research was to evaluate the seed longevity of Eragrostis plana Nees buried at different soil depths, in a natural-grassland area in the Pampa biome (46 m altitude, 30º05´S and 51º40´W of Rio Grande do Sul State, Brazil. The experimental design was a split-plot type in complete blocks with two factors: seeds buried at five different depth levels (soil surface and 2.5, 5, 10 and 20 cm and seven exhumation dates. The blocks were allocated in natural grassland grazed by cattle, allocated in a 12-m-long transection. Fifty-four permeable nylon bags filled with 100 seeds in each division, with five vertical divisions, were buried in each row. Seven exhumation dates were used: the first on October 14, 2003 and the last on January 14, 2006. The percentage of viable seeds of E. plana, collected at seven exhumation times and set at different depths in the soil horizon, were described by simple negative exponential equations. Based on the model, the percentage of viable seeds collected at the five depths, (soil surface and 2.5, 5, 10, and 20 cm, after 2.5 years of burial, were 0.1, 0.5, 1.0, 7.4 and 22.1%, respectively. Increase in depth is directly associated with physical and physiological seed integrity of E. plana. Negative simple exponential equations can be used to predict seed longevity of E. plana buried in nylon bags. This invader species accumulates soil seed-bank of high longevity.

  5. Eragrostis plana Nees as a novel eco-friendly adsorbent for removal of crystal violet from aqueous solutions.

    Science.gov (United States)

    Filho, Augusto Cezar D; Mazzocato, Ana C; Dotto, Guilherme L; Thue, Pascal S; Pavan, Flávio A

    2017-08-01

    Eragrostis plana Nees (EPN) was used as new and eco-friendly adsorbent for the removal of crystal violet dye (CV) from aqueous solution. Specific surface area (BET), scanning electron microscopy (SEM), infrared spectroscopy (ATR-FTIR), point of zero charge (pH PZC ), and modified Boehm titration method were used to characterize the EPN material. The effects of initial pH of solution, adsorbent mass, contact time and initial dye concentration, and temperature were studied in batch adsorption mode. Kinetic data were evaluated by pseudo-first-order and pseudo-second-order models. The result exhibited that pseudo-second-order model well described the adsorption kinetics of CV onto EPN. Langmuir, Freundlich, and Sips isotherm models were used for analysis of the isothermal data. The equilibrium data of adsorption of CV onto EPN was better fitted with the Sips isotherm. Based on the Sips isotherm model, the maximum adsorption capacity was 76.20 ± 1.20 mg g -1 at 333 K. A high desorption of CV from EPN was obtained using 1.00 mol L -1 of CH 3 COOH as eluent. The thermodynamic data indicated that the adsorption was spontaneous, endothermic, and physical process. EPN can be used as alternative adsorbent to remove CV from aqueous solution.

  6. Physiological response of selected eragrostis species to water ...

    African Journals Online (AJOL)

    Physiological response of selected eragrostis species to water-deficit stress. ... performing crop variety of Eragrostis tef under this stress, the responses of two varieties, ... Comparative study of closely related plant species might be a better ...

  7. On seed physiology, biomechanics and plant phenology in Eragrostis tef

    NARCIS (Netherlands)

    Delden, van S.H.

    2011-01-01

    • Key words: Teff (Eragrostis tef (Zuccagni) Trotter), germination, temperature, model, leaf appearance, phyllochron, development rate, lodging, biomechanics, safety factor, flowering, heading, day length, photoperiod.

    • Background Teff (Eragrostis tef (Zuccagni) Trotter) is a C4 annual

  8. Three new labdanes isolated from Eragrostis viscosa

    Energy Technology Data Exchange (ETDEWEB)

    Sebastiao, N' Soki N. [Chemistry Department, Agostinho Neto University, Luanda (Angola); Fernandes, Nelson; Vieira, Liliana; Mendonca, Dina I.M.D. de [Textile and Paper Materials Center and Chemistry Department, University of Beira Interior, Covilha (Portugal); Mendonca, Antonio J.G. [CICS-UBI - Health Sciences Research Centre, University of Beira Interior, Covilha, (Portugal); Gaspar, Jorge F.; Martins, Celia; Rueff, Jose, E-mail: disabel@ubi.pt [Genetics Department, Faculty of Medical Sciences, New University of Lisbon, Lisboa (Portugal); Diakanamwa, Carlos [Biology Department, Agostinho Neto University, Luanda (Angola)

    2012-10-15

    Three new labdanes with 8{alpha},15-epoxy ring [methyl 8{alpha},15-epoxylabdan-16{beta}-oate, 8{alpha},15-epoxylabdan-16{beta}-ol and 8{alpha},15-epoxy-16-norlabdan-13{beta}-ol] and five known compounds [8{alpha},15-epoxy-16-norlabdan-13-one, 8{alpha},15-epoxylabdan-16{beta}-oic acid, 3{beta}-(3''4''dihydroxy)-(E)-cinnamoyloxylup-20(29)-ene, 3-(2',3',4',6'-tetra-O-acetyl-{beta}-D-glucopyranosyloxy)-{beta}-sitosterol and 16-acetoxy-8{alpha},15-epoxylabdane] were isolated from toluene and dichloromethane extracts of aerial parts of Eragrostis viscosa. The structures of all the compounds were established based on their spectroscopic data and X-ray diffraction analysis of 8{alpha},15-epoxylabdan-16{beta}-ol. It was also studied the genotoxicity of E. viscosa, particularly compounds 16-acetoxy-8{alpha},15-epoxylabdane, 8{alpha},15-epoxy-16-norlabdan-13-one and 8{alpha},15-epoxilabdan-16{beta}-ol, using a cytokinesis-block micronucleus assay and the Ames test to assess mutagenicity. Both assays were negative. Cytotoxicity was also analyzed using an MTT assay, and 8{alpha},15-epoxy-16{beta}-ol was shown to be the most cytotoxic of the compounds tested. E. viscosa extracts were also tested to determine their antioxidant capacities, peroxide values and total phenolic contents. (author)

  9. Three new labdanes isolated from Eragrostis viscosa

    International Nuclear Information System (INIS)

    Sebastiao, N'Soki N.; Fernandes, Nelson; Vieira, Liliana; Mendonca, Dina I.M.D. de; Mendonca, Antonio J.G.; Gaspar, Jorge F.; Martins, Celia; Rueff, Jose; Diakanamwa, Carlos

    2012-01-01

    Three new labdanes with 8α,15-epoxy ring [methyl 8α,15-epoxylabdan-16β-oate, 8α,15-epoxylabdan-16β-ol and 8α,15-epoxy-16-norlabdan-13β-ol] and five known compounds [8α,15-epoxy-16-norlabdan-13-one, 8α,15-epoxylabdan-16β-oic acid, 3β-(3''4''dihydroxy)-(E)-cinnamoyloxylup-20(29)-ene, 3-(2',3',4',6'-tetra-O-acetyl-β-D-glucopyranosyloxy)-β-sitosterol and 16-acetoxy-8α,15-epoxylabdane] were isolated from toluene and dichloromethane extracts of aerial parts of Eragrostis viscosa. The structures of all the compounds were established based on their spectroscopic data and X-ray diffraction analysis of 8α,15-epoxylabdan-16β-ol. It was also studied the genotoxicity of E. viscosa, particularly compounds 16-acetoxy-8α,15-epoxylabdane, 8α,15-epoxy-16-norlabdan-13-one and 8α,15-epoxilabdan-16β-ol, using a cytokinesis-block micronucleus assay and the Ames test to assess mutagenicity. Both assays were negative. Cytotoxicity was also analyzed using an MTT assay, and 8α,15-epoxy-16β-ol was shown to be the most cytotoxic of the compounds tested. E. viscosa extracts were also tested to determine their antioxidant capacities, peroxide values and total phenolic contents. (author)

  10. Attachment study of Agrobacterium tumefaciens to tef [ Eragrostis tef ...

    African Journals Online (AJOL)

    Agrobacterium tumefaciens attachment as a factor in transformation was investigated in tef (Eragrostis tef) zygotic embryos, seeds, seedlings, leaf bases and embryogenic callus; leaf discs of yam species (Dioscorea bulbifera, Dioscorea caynensis and Dioscorea alata); and leaf discs of tobacco (Nicotina tabaccum).

  11. Condensed tannin in Eragrostis chloromelas leaves deters feeding ...

    African Journals Online (AJOL)

    We investigated the feeding responses of a generalist grasshopper, the brown locust(Locusta pardalina), to leaves of the grass Eragrostis chloromelas differing in polyphenol content. For three specimens of E. chloromelas, the presence of condensed tannin in epidermal cells was confirmed by histochemical staining, while ...

  12. The evaluation of four Eragrostis curvula ecotypes with grazing sheep.

    African Journals Online (AJOL)

    There were no significant differences in the dry matter production and chemical composition of the clipped samples of the ecotypes. Keywords: afrikaans; chemical composition; dry matter production; ecotypes; eragrostis curvula; grazing; live mass; live mass gains; open rotational grazing system; production; sheep; south ...

  13. Seasonal response of Eragrostis curvula to nitrogen | R | African ...

    African Journals Online (AJOL)

    On the basis of the seasonal response of Eragrostis curvula to nitrogen applied as single dressings to separate plots at the beginning of each of the six months of the growing season, it is deduced that nitrogen can profitably be applied in the Ukulinga environment from early spring though to early January. Late summer and ...

  14. Microplastics effects in Scrobicularia plana.

    Science.gov (United States)

    Ribeiro, Francisca; Garcia, Ana R; Pereira, Beatriz P; Fonseca, Maria; Mestre, Nélia C; Fonseca, Tainá G; Ilharco, Laura M; Bebianno, Maria João

    2017-09-15

    One of the most common plastics in the marine environment is polystyrene (PS) that can be broken down to micro sized particles. Marine organisms are vulnerable to the exposure to microplastics. This study assesses the effects of PS microplastics in tissues of the clam Scrobicularia plana. Clams were exposed to 1mgL -1 (20μm) for 14days, followed by 7days of depuration. A qualitative analysis by infrared spectroscopy in diffuse reflectance mode period detected the presence of microplastics in clam tissues upon exposure, which were not eliminated after depuration. The effects of microplastics were assessed by a battery of biomarkers and results revealed that microplastics induce effects on antioxidant capacity, DNA damage, neurotoxicity and oxidative damage. S. plana is a significant target to assess the environmental risk of PS microplastics. Copyright © 2017 Elsevier Ltd. All rights reserved.

  15. Meiosis in untreated and irradiated cyperus eragrostis vahl

    International Nuclear Information System (INIS)

    Bokhari, F.S.

    1976-01-01

    A cytological investigation of meiosis is seed irradiated Cyperus eragrostis has shown that the diffuse centromeric type of chromosome organisation leads to the formation of inviable chromosome complements, in which complex configurations resulting from stickiness as well as pairing of homologous regions, and numerous fragments, persist to the formation of pollen grains. At the higher doses, however, there is complete sterility, and low fertility even at the lower doses. The small numbers of M 2 and M 3 plants produced at lower doses show much reduced chromosomal abnormalities, indicating severe selection among the gametes and zygotes formed. There is little advantage in terms of survival from radiation damage, resulting from the possession of the diffuse centromere. (auth.)

  16. Classification of embryo sacs in the Eragrostis curvula Complex

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    T. B. Vorster

    1984-12-01

    Full Text Available At each of 17 collecting points between Johannesburg and Brits in the Transvaal, three plants which belong to the  Eragrostis curvula Complex were collected and studied. A total o f 3 902 embryo sacs was examined in this sample. Of the embryo sacs examined, 3 306 were apomictic by means of diplospory, whereas 99 were sexual monosporic Polygonum-type embryo sacs. One hundred and nineteen embryo sacs were abnormal or divergent, and 378 were degenerated. There are indications that seasonal climatic fluctuations may be responsible for embryo sacs developing abnormally or degenerating. Simple and multiple correlations confirmed that sexual embryo sacs usually do not develop abnormally or degenerate during the later developmental stages. This finding lends credence to both the system of classification of individual embryo sacs and to the validity of the estimate of the proportion of sexuality of the plants sampled at each sampling point.

  17. Genetic diversity in tef [Eragrostis tef (Zucc. Trotter

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    Kebebew eAssefa

    2015-03-01

    Full Text Available Tef [Eragrostis tef (Zucc. Trotter] is a cereal crop resilient to adverse climatic and soil conditions, and possessing desirable storage properties. Although tef provides high quality food and grows under marginal conditions unsuitable for other cereals, it is considered to be an orphan crop because it has benefited little from genetic improvement. Hence, unlike other cereals such as maize and wheat, the productivity of tef is extremely low. In spite of the low productivity, tef is widely cultivated by over six million small-scale farmers in Ethiopia where it is annually grown on more than three million hectares of land, accounting for over 30% of the total cereal acreage. Tef, a tetraploid with 40 chromosomes (2n=4x=40, belongs to the Family Poaceae and, together with finger millet (Eleusine coracana Gaertn, to the Subfamily Chloridoideae. It was believed to have originated in Ethiopia. There are about 350 Eragrostis species of which E. tef is the only species cultivated for human consumption. At the present time, the gene bank in Ethiopia holds over five thousand tef accessions collected from geographical regions diverse in terms of climate and elevation. These germplasm accessions appear to have huge variability with regard to key agronomic and nutritional traits. In order to properly utilize the variability in developing new tef cultivars, various techniques have been implemented to catalog the extent and unravel the patterns of genetic diversity. In this review, we show some recent initiatives investigating the diversity of tef using genomics, transcriptomics and proteomics and discuss the prospect of these efforts in providing molecular resources that can aid modern tef breeding.

  18. Negozio baten marketin plana: Getxoko Hurbilekojalea

    OpenAIRE

    Gantxegi Infiesta, Enara

    2018-01-01

    Gradu Amaierako Lan (GAL) honen helburua Getxoko Hurbilekojalea negozioaren inguruko Marketin Plan bat egitea da. Horretarako, sektorearen eta negozioaren azterketa sakona egingo da, negozioak aurrean dituen aukera eta mehatxuak identifikatuz, alde batetik, eta baita berezko dituen indar-gune eta ahuleziak ere. Ondoren, marketin helburuak, estrategiak eta ekintza-plana zehaztuko dira, negozioari onura ekarriko diotelakoan.

  19. Cyperus eragrostis - a new alien species for the Czech flora and the history of its invasion of Europe

    Czech Academy of Sciences Publication Activity Database

    Petřík, Petr

    2003-01-01

    Roč. 75, - (2003), s. 17-28 ISSN 0032-7786 R&D Projects: GA AV ČR KSK6005114; GA AV ČR IAA6005202 Institutional research plan: CEZ:AV0Z6005908 Keywords : Cyperus eragrostis * alien species * casual Subject RIV: EF - Botanics

  20. Investigation on resistance to drought and efficiency of water usage in two range species, Dactylis glomerata and Eragrostis curvula

    International Nuclear Information System (INIS)

    Jafari, M.; Saiedian, F.; Heydari, H.; Azarnayvand, H.; Farzaneh, Z.

    2000-01-01

    Determination of water efficiency and resistance to drought in range plants are important factors that have essential role in selection of range development methods. As there is not any comprehensive study in resistance to drought, present research was done with selection of two range species. Selected species were two kinds of Gramineae, namely Dactylis glomerata and Eragrostis curvula. Some parameters such as used water, length, width and number of leaves, dry mass of leaves were studies. Obtained results showed that length and width of leaves were not under stress in irrigation periods, but number of leaves, dry mass of leaf and stem decreased under drought stress. Amount of decrease in Eragrostis curvula was less than Dactylis glomerata Increment of irrigation periods, increased root growth rather than stem, but root growth in Dactylis glomerata was more than Eragrostis curvula for production of dry matter, Dactylis glomerata species has less water requirement and higher water usage efficiency in terms of amount of water usage. In terms of resistance to drought, Eragrostis curvula has more resistance rather than Dactylis glomerata because of high water potential and lower witt ing point

  1. Nieuwe vondsten van Eragrostis minor Host, E. pilosa (L.) Beauv. en andere van oorsprong adventieve grassen in 1982

    NARCIS (Netherlands)

    Jongepier, J.W.

    1983-01-01

    As additions to a previous paper by the same author (Jongepier, 1982) some new localities, mostly in the province of Zeeland, are given for Eragrostis minor Host, E. pilosa (L.)Beauv., Setaria glauca (L.) Beauv., S. verlicillata (L.) Beauv. and Sorghum halepense (L.) Pers., based on records during

  2. Keratometric alterations following the 25-gauge transconjunctival sutureless pars plana vitrectomy versus the conventional pars plana vitrectomy.

    Science.gov (United States)

    Citirik, Mehmet; Batman, Cosar; Bicer, Tolga; Zilelioglu, Orhan

    2009-09-01

    To assess the alterations in keratometric astigmatism following the 25-gauge transconjunctival sutureless pars plana vitrectomy versus the conventional pars plana vitrectomy. Sixteen consecutive patients were enrolled into the study. Conventional vitrectomy was applied to eight of the cases and 25-gauge transconjunctival sutureless vitrectomy was performed in eight patients. Keratometry was performed before and after the surgery. In the 25-gauge transconjunctival sutureless pars plana vitrectomy group, statistically significant changes were not observed in the corneal curvature in any post-operative follow-up measurement (p > 0.05); whereas in the conventional pars plana vitrectomy group, statistically significant changes were observed in the first postoperative day (p = 0.01) and first postoperative month (p = 0.03). We noted that these changes returned to baseline in three months (p = 0.26). Both 25-gauge transconjunctival sutureless and conventional pars plana vitrectomy are effective surgical modalities for selected diseases of the posterior segment. Surgical procedures are critical for the visual rehabilitation of the patients. The post-operative corneal astigmatism of the vitrectomised eyes can be accurately determined at least two months post-operatively.

  3. Indications and visual outcome of first hundred pars plana ...

    African Journals Online (AJOL)

    Objective: To review the indications and visual outcome of the first one hundred pars plana vitrectomies performed at the newly established surgical retina unit of Makkah Specialist Eye Hospital, Kano, Kano State, Nigeria. Materials and Methods: Aretrospective chart review was performed. Data recorded from the patient ...

  4. Clinical clues for differential diagnosis between verruca plana and verruca plana-like seborrheic keratosis.

    Science.gov (United States)

    Kim, Won-Jeong; Lee, Won-Ku; Song, Margaret; Kim, Hoon-Soo; Ko, Hyun-Chang; Kim, Byung-Soo; Kim, Moon-Bum

    2015-04-01

    Sometimes the clinical differentiation between verruca plana (VP) and VP-like seborrheic keratosis (SK) could be challenged. However, there have been no studies on this issue to date. The aim of this study was to elucidate clinical and dermoscopic differences between these two diseases, and also to suggest a diagnostic algorithm of VP and VP-like SK without skin biopsy. The patients who had lesions clinically considered as VP or VP-like SK were the target of our study. We took clinical and dermoscopic photos with informed consent and conducted a questionnaire. All patients had their diagnoses confirmed by biopsy. Thirty-three patients were enrolled in our study. Seventeen patients were finally diagnosed with VP (51.5%) and 16 patients with VP-like SK (48.5%). In clinical findings, VP-like SK showed significantly more scattered distribution than VP (P = 0.039), which exhibited more clustered or grouped distribution (P = 0.039). In dermoscopic findings, brain-like appearance was more commonly observed in VP-like SK (P = 0.003) whereas VP showed more red dots or globular vessels (P = 0.017) and even-colored light brown to yellow patch (P 0.05). Based on our results, we suggest a diagnostic algorithm using Koebner's phenomenon, dermoscopic findings, distribution of each lesion and biopsy for multiple VP-like lesions in adults, and we think it will be a very useful diagnostic tool in daily clinical dermatological practice. © 2015 Japanese Dermatological Association.

  5. De novo transcriptome sequencing and assembly from apomictic and sexual Eragrostis curvula genotypes.

    Directory of Open Access Journals (Sweden)

    Ingrid Garbus

    Full Text Available A long-standing goal in plant breeding has been the ability to confer apomixis to agriculturally relevant species, which would require a deeper comprehension of the molecular basis of apomictic regulatory mechanisms. Eragrostis curvula (Schrad. Nees is a perennial grass that includes both sexual and apomictic cytotypes. The availability of a reference transcriptome for this species would constitute a very important tool toward the identification of genes controlling key steps of the apomictic pathway. Here, we used Roche/454 sequencing technologies to generate reads from inflorescences of E. curvula apomictic and sexual genotypes that were de novo assembled into a reference transcriptome. Near 90% of the 49568 assembled isotigs showed sequence similarity to sequences deposited in the public databases. A gene ontology analysis categorized 27448 isotigs into at least one of the three main GO categories. We identified 11475 SSRs, and several of them were assayed in E curvula germoplasm using SSR-based primers, providing a valuable set of molecular markers that could allow direct allele selection. The differential contribution to each library of the spliced forms of several transcripts revealed the existence of several isotigs produced via alternative splicing of single genes. The reference transcriptome presented and validated in this work will be useful for the identification of a wide range of gene(s related to agronomic traits of E. curvula, including those controlling key steps of the apomictic pathway in this species, allowing the extrapolation of the findings to other plant species.

  6. A Proteomic Approach to Investigate the Drought Response in the Orphan Crop Eragrostis tef

    Directory of Open Access Journals (Sweden)

    Rizqah Kamies

    2017-11-01

    Full Text Available The orphan crop, Eragrostis tef, was subjected to controlled drought conditions to observe the physiological parameters and proteins changing in response to dehydration stress. Physiological measurements involving electrolyte leakage, chlorophyll fluorescence and ultra-structural analysis showed tef plants tolerated water loss to 50% relative water content (RWC before adverse effects in leaf tissues were observed. Proteomic analysis using isobaric tag for relative and absolute quantification (iTRAQ mass spectrometry and appropriate database searching enabled the detection of 5727 proteins, of which 211 proteins, including a number of spliced variants, were found to be differentially regulated with the imposed stress conditions. Validation of the iTRAQ dataset was done with selected stress-related proteins, fructose-bisphosphate aldolase (FBA and the protective antioxidant proteins, monodehydroascorbate reductase (MDHAR and peroxidase (POX. Western blot analyses confirmed protein presence and showed increased protein abundance levels during water deficit while enzymatic activity for FBA, MDHAR and POX increased at selected RWC points. Gene ontology (GO-term enrichment and analysis revealed terms involved in biotic and abiotic stress response, signaling, transport, cellular homeostasis and pentose metabolic processes, to be enriched in tef upregulated proteins, while terms linked to reactive oxygen species (ROS-producing processes under water-deficit, such as photosynthesis and associated light harvesting reactions, manganese transport and homeostasis, the synthesis of sugars and cell wall catabolism and modification, to be enriched in tef downregulated proteins.

  7. A Proteomic Approach to Investigate the Drought Response in the Orphan Crop Eragrostis tef.

    Science.gov (United States)

    Kamies, Rizqah; Farrant, Jill M; Tadele, Zerihun; Cannarozzi, Gina; Rafudeen, Mohammed Suhail

    2017-11-15

    The orphan crop, Eragrostis tef , was subjected to controlled drought conditions to observe the physiological parameters and proteins changing in response to dehydration stress. Physiological measurements involving electrolyte leakage, chlorophyll fluorescence and ultra-structural analysis showed tef plants tolerated water loss to 50% relative water content (RWC) before adverse effects in leaf tissues were observed. Proteomic analysis using isobaric tag for relative and absolute quantification (iTRAQ) mass spectrometry and appropriate database searching enabled the detection of 5727 proteins, of which 211 proteins, including a number of spliced variants, were found to be differentially regulated with the imposed stress conditions. Validation of the iTRAQ dataset was done with selected stress-related proteins, fructose-bisphosphate aldolase (FBA) and the protective antioxidant proteins, monodehydroascorbate reductase (MDHAR) and peroxidase (POX). Western blot analyses confirmed protein presence and showed increased protein abundance levels during water deficit while enzymatic activity for FBA, MDHAR and POX increased at selected RWC points. Gene ontology (GO)-term enrichment and analysis revealed terms involved in biotic and abiotic stress response, signaling, transport, cellular homeostasis and pentose metabolic processes, to be enriched in tef upregulated proteins, while terms linked to reactive oxygen species (ROS)-producing processes under water-deficit, such as photosynthesis and associated light harvesting reactions, manganese transport and homeostasis, the synthesis of sugars and cell wall catabolism and modification, to be enriched in tef downregulated proteins.

  8. Pars plana vitrectomy for disturbing primary vitreous floaters: clinical outcome and patient satisfaction

    NARCIS (Netherlands)

    Nie, K.F. de; Crama, N.; Tilanus, M.A.D.; Klevering, B.J.; Boon, C.J.F.

    2013-01-01

    BACKGROUND: Primary vitreous floaters can be highly bothersome in some patients. In the case of persistently bothersome floaters, pars plana vitrectomy may be the most effective treatment. The aim of this study is to evaluate the incidence of complications, and patient satisfaction, after pars plana

  9. Four cases of endophthalmitis after 25-gauge pars plana vitrectomy

    Directory of Open Access Journals (Sweden)

    Mutoh T

    2012-08-01

    Full Text Available Tetsuya Mutoh, Koji Kadoya, Makoto ChikudaDepartment of Ophthalmology, Dokkyo Medical University Koshigaya Hospital, Koshigaya, Saitama, JapanAbstract: We report our recent experience with four cases of endophthalmitis (one male, three females after 25-gauge pars plana vitrectomy (PPV. One was a case of persistent cystoid macular edema caused by branch retinal vein occlusion, whereas the remaining three were cases of epiretinal membrane. Preoperative antibiotics before the first PPV procedure were not administered in three of the four cases. Endophthalmitis occurred 2–4 days after the first procedure in all cases, for which ceftazidime 2.0 mg/0.1 mL and vancomycin 1.0 mg/0.1 mL were injected into the vitreous cavity. This was followed by emergent 20-gauge PPV and intraocular lens removal using an infusion fluid containing ceftazidime and vancomycin. After the second PPV procedure, progress was good in three cases while retinal detachment occurred in the remaining case one month after surgery; this case required a third PPV procedure. Final best-corrected visual acuity ranged from 20/100 to 20/25 for the four cases. Bacterial cultures were negative after the second PPV procedure in all cases. In conclusion, postoperative endophthalmitis occurred in four of 502 cases (0.80% that underwent 25-gauge PPV at our hospital. It is important to minimize the incidence of endophthalmitis after 25-gauge PPV.Keywords: 25-gauge pars plana vitrectomy, endophthalmitis, incidence

  10. Pars plana Ahmed valve and vitrectomy in patients with glaucoma associated with posterior segment disease.

    Science.gov (United States)

    Wallsh, Josh O; Gallemore, Ron P; Taban, Mehran; Hu, Charles; Sharareh, Behnam

    2013-01-01

    To assess the safety and efficacy of a modified technique for pars plana placement of the Ahmed valve in combination with pars plana vitrectomy in the treatment of glaucoma associated with posterior segment disease. Thirty-nine eyes with glaucoma associated with posterior segment disease underwent pars plana vitrectomy combined with Ahmed valve placement. All valves were placed in the pars plana using a modified technique, without the pars plana clip, and using a scleral patch graft. The 24 eyes diagnosed with neovascular glaucoma had an improvement in intraocular pressure from 37.6 mmHg to 13.8 mmHg and best-corrected visual acuity from 2.13 logarithm of minimum angle of resolution to 1.40 logarithm of minimum angle of resolution. Fifteen eyes diagnosed with steroid-induced glaucoma had an improvement in intraocular pressure from 27.9 mmHg to 14.1 mmHg and best-corrected visual acuity from 1.38 logarithm of minimum angle of resolution to 1.13 logarithm of minimum angle of resolution. Complications included four cases of cystic bleb formation and one case of choroidal detachment and explantation for hypotony. Ahmed valve placement through the pars plana during vitrectomy is an effective option for managing complex cases of glaucoma without the use of the pars plana clip.

  11. Rearranjo estrutural de PET durante compressão plana

    OpenAIRE

    Elton Luis Gasparotto Denardin

    2004-01-01

    As características da tensão – deformação do Poli(tereftalato de etileno) (PET) durante o processo de deformação por compressão plana tem sido estudadas. Amostras de PET com e sem tratamento térmico obtidas por injeção foram deformadas a diferentes temperaturas de deformação, abaixo e acima da temperatura de transição vítrea (Tg) utilizando diferentes taxas de deformação e tensões finais aplicadas. O comportamento mecânico foi analisado através das curvas de tensão – deformação obtidas por de...

  12. Effect of varying carbohydrate levels on the uptake and translocation of 32P in Eragrostis curvula (Schrad.) Nees

    International Nuclear Information System (INIS)

    Naidoo, G.; Steinke, T.D.

    1979-01-01

    The uptake and subsequent translocation of 32 P among root, crown and leaf tissues of Eragrostis curvula were investigated in plants with varying carbohydrate levels. Plants were depleted of carbohydrates by being subjected to 3 days of continuous darkness and by defoliation. Plant roots were introduced to nutrient solutions containing 32 P, at 0, 3, 6, 9, 12, 15 and 21 days after the depletion treatments. Initially, plants depleted of carbohydrates absorbed and translocated less 32 P than the controls. Subsequently, uptake and translocation increased probably to restore the pools of phosphate to levels prior to the depletion treatments. Increased 32 P uptake and translocation were related to an adequate supply of reserve carbohydrates [af

  13. Análisis geotécnico de anclas planas para plataformas marinas

    OpenAIRE

    Arto Cuesta, Javier

    2017-01-01

    RESUMEN: El presente Trabajo de Fin de Grado es un estudio englobado en el campo de la geotecnia offshore sobre el comportamiento de anclas planas para aerogeneradores dispuestas en suelos puramente cohesivos (arcilla) y puramente friccionales (arena). Para elaborar el análisis, se ha realizado un modelado numérico, mediante un software comercial basado en el empleo de elementos finitos, de un ancla plana dispuesta a diferentes profundidades, sobre la cual se aplica un desplazamien...

  14. Efficacy and safety of the pars plana clip in the Ahmed valve device inserted via the pars plana in patients with refractory glaucoma

    Directory of Open Access Journals (Sweden)

    Manuel Diaz-Llopis

    2010-05-01

    Full Text Available Manuel Diaz-Llopis1,2,3, David Salom1,3, Salvador García-Delpech1,2,3, Patricia Udaondo1,3, Jose Maria Millan3,5, J Fernando Arevalo61Department of Ophthalmology, La Fe University Hospital of Valencia, Valencia, Spain; 2Department of Ophthalmology of the Valencia University, Valencia, Spain; 3Biomedical Network Research Centre on Rare Diseases (CIBERER, Valencia, Spain; 4Catholic University San Vicente Martir, Valencia, Spain; 5Department of Genetics, La Fe University Hospital of Valencia, Valencia, Spain; 6Clinica Oftalmologica Centro Caracas, Retina and VItreous Service, Caracas, DC, VenezuelaPurpose: To evaluate the efficacy and safety of the pars plana clip (PPC in the Ahmed valve tube inserted via the pars plana in patients with secondary refractory glaucomas.Methods: Prospective and interventional case series that included 10 patients with secondary refractory glaucoma. The pars plana vitrectomy and the implant of the modified tube were performed during the same surgery. Control of intraocular pressure (IOP and the development of intra- and postoperative complications were evaluated during the follow-up.Results: Follow-up time was twelve months in all the patients. Control of IOP was achieved in 90% of patients, and 70% needed no antiglaucoma treatment. The complications that occurred were transient hypotony in three cases, choroidal detachment in two cases, and one case of intraocular hemorrhage. No case of tube extrusion or tube kink was observed.Conclusions: Our data suggests that implantation of the Ahmed tube modified with the PPC via the pars plana is safe and effective in patients with secondary refractory glaucomas. Keywords: pars plana clip, Ahmed valve, refractory glaucoma, pars plana vitrectomy

  15. GIANT CELL TUMOR OF THE VERTEBRA SIMULATING VERTEBRA PLANA

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    B. Aalami-Harandi

    1981-07-01

    Full Text Available A case of g iant cell tumor of t he vertebra simulat ing vert ebra plana was reported . t he d i agnos i s o f t he vertebra plana should not be confirmed by t he history of the patient and radiologica l manifestation alone . it can onlybe confirmed by biopsy ."nBone l esions of the spine i s one of the most di fficul t problems t o diagnosis and t r eat . Spinal tumors a r e either primary or metastatic . Ilos t bone tumors of the spine i n t he first two decade of l i f e are primary and benign;where as a majority of the bone lesions in old people ar e me tast at1,c and rna I 1' 9n ant . 5- 11 The rnaI1' 9~ant Lee Ss 1i 0ns 0f t h e Sp1' - ne can wi t hout very great risk be excl uded f r om diagnostic considerati on in chi ldren and adoles cence (She r r a r d . 1969 12 . From 34 casps of bone l esions of the spine and the pelvis i n the f irst two decade of l i f e, reported by Thommes on and 1 3 , Paulsen (1967 ni ne were histiochtosis X, two anevr ysma l bone cyst,nine Ewi ng sar coma , two reticul um cell sar c ~ma. None were g i ant cel l tumor ."nGiant cell tumor of the spine is r a re; mo s t of t he report ed cases were in t he sacrum. J affe (1958 17repor t ed only two c ases of giant cell t umo r, one of which o c c ur r e d in the por t e d s a c r um.Of the 218 cases of the g i an t ce l l tumor re6 by Goldenbe rg and Carnpbell( 1970 there were 13 cases of g i ant c e l l tumor o f the ver t ebra , one in the cervical r e g i o n , o ne in the l umbar spi ne , and e l e ven in t he sacrum. Of '08 giant ce l l t umors studied by Coley( 19604 ,one was i n the lumba r ver t ebra and one in the s a c rum. al In a r e view of 413 tumors i nc l uding t he spine(Cohen et 3 1964 tr.ere were sixteen cases o f g i ant c e l l tumor ,one  n the c e r vica l spine , one in the l umbar r e gion and f ourte61 n the sacrum. I n thi s a r t i c l e we are going to report a case of giant cel l t umor of the s i xth thor a ci

  16. Outcome of early pars plana vitrectomy in exogenous endophthalmitis

    International Nuclear Information System (INIS)

    Dar, A.J.; Islam, Q.U.; Hanif, M.K.

    2013-01-01

    Objective: To evaluate the role of early pars plana vitrectomy (PPV) in cases of exogenous endophthalmitis in terms of final visual outcome and to determine association between various study variables and final visual outcome. Study Design: Quasi experimental study. Place and Duration of Study: Armed Forces Institute of Ophthalmology (AFIO) Rawalpindi, from Aug 2010 to May 2012. Patients and Methods: Eleven cases of exogenous endophthalmitis (post surgical/post traumatic) were managed surgically through 20 G or 23/25 G complete and early PPV. Vitreous aspirate/explanted intraocular lens (IOL) were sent for culture and sensitivity in all cases. Intra and post operative complications were recorded and best corrected visual acuity (BCVA) at 3 months post operative interval was taken as final visual acuity. Results: Median age of study population was 55 years with male preponderance (64%). Approximately 2/3 rd of study population developed endophthalmitis within 6 weeks of surgery/trauma and 55% of patients were operated within 2 weeks of presentation. Positive culture from vitreous aspirate/IOL explant was obtained in 27% of cases. All the patients had initial BCVA in the range of counting finger (CF) at 2 meter to perception of light (PL+). However, 18% of the patients achieved final BCVA of 6/12 or better and 64% achieved final BCVA of 6/36 or better. Maculopathy (macular scar, macular pucker), corneal decompensation, corneal opacity and raised intraocular pressure were the major complications associated with compromised visual outcome. Conclusion: With the advancement in vitreoretinal surgical techniques and availability of more sophisticated viewing and illumination systems, early and complete vitrectomy for post operative or post traumatic endophthalmitis results in favorable visual outcome and early rehabilitation. (author)

  17. Dietary Intakes of Minerals, Essential and Toxic Trace Elements for Adults from Eragrostis tef L.: A Nutritional Assessment

    Directory of Open Access Journals (Sweden)

    Eva Koubová

    2018-04-01

    Full Text Available This study analysed the contents of thirty-six mineral and trace elements in teff (Eragrostis tef L. grains. What is more, dietary intakes were calculated. Inductively coupled plasma mass spectrometry (ICP-MS was used to assess mineral and trace element contents. Consequently, the appropriate Recommended Dietary Allowance (RDA or adequate intake (AI, and provisional tolerable weekly intake (PTWI or provisional tolerable monthly intake (PTMI values for adults were determined according to the Food and Agriculture Organization/World Health Organization (FAO/WHO and Institute of Medicine (IOM regulations. Teff is a significant contributor to RDAs and AIs for females in the following order: Mn > Cu > Zn ≥ Mg > Fe ≥ P and Ca. For males, teff contributes in the order, Mn > Cu > Fe > Zn ≥ P ≥ Mg > and Ca. The concentration of arsenic (65.9 µg/kg in brown teff originating in Bolivia exceeded the average acceptable value set by Reg. No. 1881 of 6–50 µg/kg in cereals consumed in the EU. The PTWIs or PTMIs for Al, Cd, Sn and Hg were all under 7%, which is below the limits of toxic element intake related to the body weight of 65 kg for adult females and 80 kg for males, set by the FAO/WHO. Teff grains can be recommended as a valuable and safe source of minerals and trace elements.

  18. The rate of endophthalmitis after pars plana vitrectomy and its risk factors.

    Science.gov (United States)

    Tabatabaei, Seyed Ali; Soleimani, Mohammad; Vakili, Hadi; Naderan, Morteza; Lashay, Alireza; Faghihi, Houshang; Yaseri, Mehdi

    2018-05-11

    To study the incidence of endophthalmitis after pars plana vitrectomy, its causative organisms, and visual acuity outcomes. In this retrospective, comparative study, the medical records of patients with acute-onset postoperative endophthalmitis after pars plana vitrectomy at Farabi Eye Hospital, Tehran, Iran, during a 12-year period between January 2004 and November 2015 were reviewed. To compare the endophthalmitis patients with other cases who underwent pars plana vitrectomy at the same day and also the same operating room, a control group was developed by gathering the data from surgical records. In the present study, the incidence rate of pos- vitrectomy endophthalmitis was 0.04% (16/39783). The organisms identified in aqueous or vitreous cultures (culture positive 44%) included Streptococcus pneumoniae (two patients, 12.5%), Pseudomonas aeruginosa (two patients, 12.5%), fungi (two patients, 12.5%), and Streptococcus viridans (one patient, 6.25%). Visual acuity after treatment for endophthalmitis ranged from light perception (7 eyes) to hand motion (1 eye), and evisceration was performed in 8 eyes (50%). When comparing the cases (patients developing endophthalmitis) and controls (patients with no complications operated in the same day and place of operation with the case group), only not using tamponade showed a statistically significant relation with the occurrence of endophthalmitis (p = 0.034). Our results indicated low incidence of endophthalmitis after pars plana vitrectomy comparable to previous studies which resulted in poor visual acuity. It seems that not using tamponade might increase the risk of endophthalmitis among these patients.

  19. EARLY SIMULTANEOUS FUNDUS AUTOFLUORESCENCE AND OPTICAL COHERENCE TOMOGRAPHY FEATURES AFTER PARS PLANA VITRECTOMY FOR PRIMARY RHEGMATOGENOUS RETINAL DETACHMENT

    NARCIS (Netherlands)

    Dellʼomo, Roberto; Mura, Marco; Lesnik Oberstein, Sarit Y.; Bijl, Heico; Tan, H. Stevie

    2012-01-01

    Purpose: To describe fundus autofluorescence and optical coherence tomography (OCT) features of the macula after pars plana vitrectomy for rhegmatogenous retinal detachment. Methods: Thirty-three eyes of 33 consecutive patients with repaired rhegmatogenous retinal detachment with or without the

  20. Cadmium sulfide quantum dots induce oxidative stress and behavioral impairments in the marine clam Scrobicularia plana.

    Science.gov (United States)

    Buffet, Pierre-Emmanuel; Zalouk-Vergnoux, Aurore; Poirier, Laurence; Lopes, Christelle; Risso-de-Faverney, Christine; Guibbolini, Marielle; Gilliland, Douglas; Perrein-Ettajani, Hanane; Valsami-Jones, Eugenia; Mouneyrac, Catherine

    2015-07-01

    Cadmium sulfide (CdS) quantum dots have a number of current applications in electronics and solar cells and significant future potential in medicine. The aim of the present study was to examine the toxic effects of CdS quantum dots on the marine clam Scrobicularia plana exposed for 14 d to these nanomaterials (10 µg Cd L(-1) ) in natural seawater and to compare them with soluble Cd. Measurement of labile Cd released from CdS quantum dots showed that 52% of CdS quantum dots remained in the nanoparticulate form. Clams accumulated the same levels of Cd regardless of the form in which it was delivered (soluble Cd vs CdS quantum dots). However, significant changes in biochemical responses were observed in clams exposed to CdS quantum dots compared with soluble Cd. Increased activities of catalase and glutathione-S-transferase were significantly higher in clams exposed in seawater to Cd as the nanoparticulate versus the soluble form, suggesting a specific nano effect. The behavior of S. plana in sediment showed impairments of foot movements only in the case of exposure to CdS quantum dots. The results show that oxidative stress and behavior biomarkers are sensitive predictors of CdS quantum dots toxicity in S. plana. Such responses, appearing well before changes might occur at the population level, demonstrate the usefulness of this model species and type of biomarker in the assessment of nanoparticle contamination in estuarine ecosystems. © 2015 SETAC.

  1. The generalized Abel-Plana formula. Applications to Bessel functions and Casimir effect

    International Nuclear Information System (INIS)

    Saharian, A.A.; Institute of Applied Problems in Physics NAS RA, Yerevan; Abdus Salam International Centre for Theoretical Physics, Trieste

    2000-02-01

    One of the most efficient methods to obtain the vacuum expectation values for the physical observables in the Casimir effect is based on using the Abel-Plana summation formula. This allows us to derive the regularized quantities in a manifestly cutoff independent way and present them in the form of strongly convergent integrals. However, the application of Abel-Plana formula, in its usual form, is restricted by simple geometries when the eigenmodes have a simple dependence on quantum numbers. The author generalized the Abel-Plana formula which essentially enlarges its application range. Based on this generalization, formulae have been obtained for various types of series over the zeros of some combinations of Bessel functions and for integrals involving these functions. It has been shown that these results generalize the special cases existing in literature. Further, the derived summation formulae have been used to summarize series arising in the mode summation approach to the Casimir effect for spherically and cylindrically symmetric boundaries. This allows us to extract the divergent parts from the vacuum expectation values for the local physical observables in a manifestly cutoff independent way. The present paper reviews these results. Some new considerations are also added. (author)

  2. Glaucoma de ángulo abierto posterior a la vitrectomía pars plana

    Directory of Open Access Journals (Sweden)

    Kenia Galindo Reymond

    Full Text Available Con este trabajo nos proponemos revisar las evidencias científicas relacionadas con la aparición del glaucoma de ángulo abierto posterior a la vitrectomía pars plana. Se revisaron las evidencias científicas relacionadas con la aparición del glaucoma de ángulo abierto posterior a la cirugía de vitrectomía pars plana. Para la investigación documental se examinaron los artículos de la temática indexados en las bases de datos Pubmed, Pubmed Central y Scielo, que correspondieron a los descriptores DeCs-MeSH: glaucoma de ángulo abierto y vitrectomía pars plana. En la búsqueda de avanzada se utilizó el booleano AND y la restricción de tiempo entre los años 2004 y 2014. De los 38 artículos identificados, se desecharon 16 por no tenerse acceso íntegro al documento. El tratamiento de los datos se realizó mediante el análisis de contenido de tipo directo. Los mecanismos patológicos que causan glaucoma de ángulo abierto posterior a la vitrectomía pars plana son múltiples y complejos. La hipótesis del daño por estrés oxidativo en las celdas de la malla trabecular y su repercusión en la salida del humor acuoso, tiene un sustento científico en su patogenia que la hace plausible. El tratamiento para controlar la hipertensión ocular en estos pacientes después de la vitrectomía es individualizado; puede transitar desde el tratamiento médico y hasta el uso de técnicas quirúrgicas simples o complejas en algunos casos. Aún no se han esclarecido los mecanismos fisiopatológicos del glaucoma de ángulo abierto posterior a la vitrectomía pars plana, por lo que son necesarias nuevas investigaciones sobre el tema.

  3. Vitrectomía pars plana y reimplante de lente intraocular en surco Pars plana vitrectomy and intraocular lens repositioning in the sulcus

    Directory of Open Access Journals (Sweden)

    Alejandro Guerra García

    2010-01-01

    Full Text Available Se presentó un caso de lente intraocular luxado a vítreo en paciente con conteo bajo de células endoteliales e intolerancia a lentes de contacto. Se practicó vitrectomía pars plana con reimplante de lente en surco ciliar con el objetivo de demostrar la fiabilidad de la técnica para casos que presenten condiciones adecuadas y situaciones especiales. Se revisó la bibliografía para conocer las tendencias actuales con respecto al manejo de esta patología. El paciente alcanzó una agudeza visual de 20/30. El lente permaneció estable en el surco 3 meses después de practicada la vitrectomía. El manejo de esta entidad debe ser personalizado. La técnica utilizada debe ser siempre la primera opción de tratamiento y parece ser segura en casos cuidadosamente escogidos.A case of dislocated intraocular lens moved to the vitreous cavity in a patient with low endothelial cell count and contact lens intolerance was reported. A pars plana vitrectomy with lens repositioning was performed to demonstrate the safety of this technique for some special cases under adequate conditions. The literature was reviewed to learn about the current management of this pathology. Finally, patient's best visual acuity was 20/30. The stability of the lens was confirmed three month l after the vitrectomy. Management of this disorder should be customized. This technique should be considered as the first option of treatment and seems to be safe in selected cases.

  4. Preretinal partial pressure of oxygen gradients before and after experimental pars plana vitrectomy.

    Science.gov (United States)

    Petropoulos, Ioannis K; Pournaras, Jean-Antoine C; Stangos, Alexandros N; Pournaras, Constantin J

    2013-01-01

    To evaluate preretinal partial pressure of oxygen (PO2) gradients before and after experimental pars plana vitrectomy. Arteriolar, venous, and intervascular preretinal PO2 gradients were recorded in 7 minipigs during slow withdrawal of oxygen-sensitive microelectrodes (10-μm tip diameter) from the vitreoretinal interface to 2 mm into the vitreous cavity. Recordings were repeated after pars plana vitrectomy and balanced salt solution (BSS) intraocular perfusion. Arteriolar, venous, and intervascular preretinal PO2 at the vitreoretinal interface were 62.3 ± 13.8, 22.5 ± 3.3, and 17.0 ± 7.5 mmHg, respectively, before vitrectomy; 97.7 ± 19.9, 40.0 ± 21.9, and 56.3 ± 28.4 mmHg, respectively, immediately after vitrectomy; and 59.0 ± 27.4, 25.2 ± 3.0, and 21.5 ± 4.5 mmHg, respectively, 2½ hours after interruption of BSS perfusion. PO2 2 mm from the vitreoretinal interface was 28.4 ± 3.6 mmHg before vitrectomy; 151.8 ± 4.5 mmHg immediately after vitrectomy; and 34.8 ± 4.1 mmHg 2½ hours after interruption of BSS perfusion. PO2 gradients were still present after vitrectomy, with the same patterns as before vitrectomy. Preretinal PO2 gradients are not eliminated after pars plana vitrectomy. During BSS perfusion, vitreous cavity PO2 is very high. Interruption of BSS perfusion evokes progressive equilibration of vitreous cavity PO2 with concomitant progressive return of preretinal PO2 gradients to their previtrectomy patterns. This indicates that preretinal diffusion of oxygen is not altered after vitrectomy. The beneficial effect of vitrectomy in ischemic retinal diseases or macular edema may be related to other mechanisms, such as increased oxygen convection currents or removal of growth factors and cytokines secreted in the vitreous.

  5. The generalized Abel-Plana formula with applications to Bessel functions and casimir effect

    International Nuclear Information System (INIS)

    Saharian, Aram A.

    2007-08-01

    One of the most efficient methods for the evaluation of the vacuum expectation values for physical observables in the Casimir effect is based on using the Abel-Plana summation formula. This enables to derive the renormalized quantities in a manifestly cutoff independent way and to present them in the form of strongly convergent integrals. However, applications of the Abel- Plana formula, in its usual form, are restricted by simple geometries when the eigenmodes have a simple dependence on quantum numbers. The author generalized the Abel-Plana formula which essentially enlarges its application range. Based on this generalization, formulae have been obtained for various types of series over the zeros of combinations of Bessel functions and for integrals involving these functions. It has been shown that these results generalize the special cases existing in literature. Further, the derived summation formulae have been used to summarize series arising in the direct mode summation approach to the Casimir effect for spherically and cylindrically symmetric boundaries, for boundaries moving with uniform proper acceleration, and in various braneworld scenarios. This allows to extract from the vacuum expectation values of local physical observables the parts corresponding to the geometry without boundaries and to present the boundary-induced parts in terms of integrals strongly convergent for the points away from the boundaries. As a result, the renormalization procedure for these observables is reduced to the corresponding procedure for bulks without boundaries. The present paper reviews these results. We also aim to collect the results on vacuum expectation values for local physical observables such as the field square and the energy-momentum tensor in manifolds with boundaries for various bulk and boundary geometries. (author)

  6. Radiación acústica por superficies planas: Aplicación a altavoces

    OpenAIRE

    Alba, Jesús; Ramis, Jaime; Espinosa, Víctor; Sánchez, Víctor

    2003-01-01

    En los sistemas de reproducción sonora es habitual la utilización de altavoces dinámicos. Sin embargo, en aplicaciones específicas, puede ser necesaria y/o conveniente la utilización de altavoces alternativos con superficies planas como diafragma, como los electrostáticos o los basados en la tecnología NXT© . Estos altavoces generan el campo acústico mediante la vibración de una superficie rectangular. Se puede suponer, en una primera aproximación, que todos los puntos sobre su su...

  7. Corneal topographic changes after 20-gauge pars plana vitrectomy associated with scleral buckling for the treatment of rhegmatogenous retinal detachment

    Directory of Open Access Journals (Sweden)

    Alexandre Achille Grandinetti

    2013-04-01

    Full Text Available PURPOSE: To evaluate the changes in corneal topography after 20-gauge pars plana vitrectomy associated with scleral buckling for the repair of rhegmatogenous retinal detachment. METHODS: Twenty-five eyes of 25 patients with rhegmatogenous retinal detachment were included in this study. 20-gauge pars plana vitrectomy associated with scleral buckling was performed in all patients. The corneal topography of each was measured before surgery and one week, one month, and three months after surgery by computer-assisted videokeratoscopy. RESULTS: A statistically significant central corneal steepening (average, 0,9 D , p<0,001 was noted one week after surgery. The total corneal astigmatism had a significant increase in the first postoperative month (p=0,007. All these topographic changes persisted for the first month but returned to preoperative values three months after the surgery. CONCLUSION: Pars plana vitrectomy with scleral buckling was found to induce transient changes in corneal topography.

  8. Late-Onset Inadvertent Bleb Formation following Pars Plana M3 Molteno Implant Tube Obstruction

    Directory of Open Access Journals (Sweden)

    Anmar M. Abdul-Rahman

    2017-01-01

    Full Text Available Purpose: To report a case of inadvertent bleb formation presenting 18 months after pars plana M3 Molteno implant tube obstruction in a patient with mixed mechanism glaucoma. Materials and Methods: An 84-year-old Caucasian male with mixed mechanism glaucoma underwent slit-lamp examination, gonioscopy, colour anterior segment photography and anterior segment optical coherence tomography (AS-OCT. Results: An inadvertent bleb developed 18 months after pars plana implant tube re-positioning with a 6/0 Vicryl tie ligature. The bleb was located in the area anterior to the implant plate; it was characterised by a thin, transparent, avascular and multi-cystic wall, with a visible stoma at the posterior edge of the bleb. The bleb was functioning as demonstrated by an intraocular pressure of 6 mm Hg at presentation and a punctate fluorescein uptake pattern of the bleb wall. The bleb over the plate of the Molteno implant was non-functioning, likely secondary to tube obstruction by vitreous in the early postoperative period. AS-OCT showed a tract from the anterior chamber commencing at an entry wound through a corneal tunnel to the posterior stoma at the base of the inadvertent bleb. Conclusions: We hypothesise that the pathophysiologic factors resulting in an inadvertent bleb are a result of a combination of apoptosis, late-onset wound dehiscence and internal gaping of a centrally placed corneal wound. In addition, aqueous hydrodynamic factors may play a role.

  9. The loss of 60Co by Scrobicularia plana and Carcinus maenas as influenced by the way of contamination

    International Nuclear Information System (INIS)

    Amiard-Triquet, C.; Amiard, J.-C.

    1976-01-01

    The elimination of 60 Co by Scrobicularia plana and Carcinus maenas depends upon the way of contamination: the loss of cobalt by both species is relatively fast after a single intake of contaminated food. It is slower after chronic ingestion of radioactive food [fr

  10. Case report: a novel KERA mutation associated with cornea plana and its predicted effect on protein function

    DEFF Research Database (Denmark)

    Roos, Laura; Bertelsen, Birgitte; Harris, Pernille

    2015-01-01

    of the keratocan gene (KERA) on chromosome 12q22. To date, only nine different disease-associated KERA mutations, including four missense mutations, have been described. Case presentation: In this report, we present clinical data from a Turkish family with autosomal recessive cornea plana. In some of the affected...

  11. Combined proteomic and metallomic analyses in Scrobicularia plana clams to assess environmental pollution of estuarine ecosystems.

    Science.gov (United States)

    González-Domínguez, Raúl; Santos, Hugo Miguel; Bebianno, Maria João; García-Barrera, Tamara; Gómez-Ariza, José Luis; Capelo, José Luis

    2016-12-15

    Estuaries are very important ecosystems with great ecological and economic value, but usually highly impacted by anthropogenic pressure. Thus, the assessment of pollution levels in these habitats is critical in order to evaluate their environmental quality. In this work, we combined complementary metallomic and proteomic approaches with the aim to monitor the effects of environmental pollution on Scrobicularia plana clams captured in three estuarine systems from the south coast of Portugal; Arade estuary, Ria Formosa and Guadiana estuary. Multi-elemental profiling of digestive glands was carried out to evaluate the differential pollution levels in the three study areas. Then, proteomic analysis by means of two-dimensional gel electrophoresis and mass spectrometry revealed twenty-one differential proteins, which could be associated with multiple toxicological mechanisms induced in environmentally stressed organisms. Accordingly, it could be concluded that the combination of different omic approaches presents a great potential in environmental research. Copyright © 2016 Elsevier Ltd. All rights reserved.

  12. Pars-plana fluid aspiration for positive vitreous cavity pressure in anterior segment surgeries

    Directory of Open Access Journals (Sweden)

    Thomas Kuriakose

    2018-01-01

    Full Text Available Positive vitreous pressure due to misdirection of aqueous or choroidal effusion leads to shallowing of the anterior chamber (AC before or during anterior segment surgeries. This shallow AC if not addressed makes surgery difficult and increases the risk of surgical complications. Methods to prevent and manage this condition described in literature are not without problems. We describe a minimally invasive technique of passing a 30G needle through the pars-plana to aspirate misdirected fluid from vitreous cavity either as a prophylaxis just before surgery or during it, thereby decreasing positive vitreous pressure. This technique, used in 12 eyes, seems to be effective in patients with angle-closure glaucoma, malignant glaucoma, and per-operative sudden increase in vitreous pressure during surgery. Small-incision surgeries are ideally suited for this procedure. This minimally invasive technique is simple to perform and complications are unlikely to be more than what is seen with intravitreal injections.

  13. Ecotoxicological Effects of Chemical Contaminants Adsorbed to Microplastics in the Clam Scrobicularia plana

    Directory of Open Access Journals (Sweden)

    Sarit O'Donovan

    2018-04-01

    Full Text Available Although microplastics (MPs are distributed globally in the marine environment, a great deal of unknowns relating to their ecotoxicological effects on the marine biota remains. Due to their lipophilic nature, microplastics have the potential to adsorb persistent organic pollutants present in contaminated regions, which may increase their detrimental impact once assimilated by organisms. This study investigates the ecotoxicological effects of exposure to low-density polyethylene (LDPE microplastics (11–13 μm, with and without adsorbed contaminants (benzo[a]pyrene—BaP and perfluorooctane sulfonic acid—PFOS, in the peppery furrow shell clam, Scrobicularia plana. Environmentally relevant concentrations of contaminants (BaP−16.87 ± 0.22 μg g−1 and PFOS−70.22 ± 12.41 μg g−1 were adsorbed to microplastics to evaluate the potential role of plastic particles as a source of chemical contamination once ingested. S. plana were exposed to microplastics, at a concentration of 1 mg L−1, in a water-sediment exposure setup for 14 days. Clams were sampled at the beginning of the experiment (day 0 and after 3, 7, and 14 days. BaP accumulation, in whole clam tissues, was analyzed. A multi-biomarker assessment was conducted in the gills, digestive gland, and haemolymph of clams to clarify the effects of exposure. This included the quantification of antioxidant (superoxide dismutase, catalase, glutathione peroxidase and biotransformation (glutathione-S-transferases enzyme activities, oxidative damage (lipid peroxidation levels, genotoxicity (single and double strand DNA breaks, and neurotoxicity (acetylcholinesterase activity. Results suggest a potential mechanical injury of gills caused by ingestion of microplastics that may also affect the analyzed biomarkers. The digestive gland seems less affected by mechanical damage caused by virgin microplastic exposure, with the MPs-adsorbed BaP and PFOS exerting a negative influence over the assessed

  14. LONG-TERM INTRAOCULAR PRESSURE AFTER UNCOMPLICATED PARS PLANA VITRECTOMY FOR IDIOPATHIC EPIRETINAL MEMBRANE.

    Science.gov (United States)

    Tognetto, Daniele; Pastore, Marco R; Cirigliano, Gabriella; DʼAloisio, Rossella; Borelli, Massimo; De Giacinto, Chiara

    2017-11-16

    To investigate long-term intraocular pressure trends after uncomplicated pars plana vitrectomy for idiopathic epiretinal membrane. Three hundred and sixty-eight eyes of 368 consecutive patients were enrolled. Changes in intraocular pressure 1, 3, 6, and 12 months after surgery and during the final follow-up visit were evaluated in vitrectomized eyes and nonvitrectomized fellow eyes. The median follow-up period was 36 months (range 12-92 months). Longitudinal data analysis evidenced a 2.5-mmHg (2.2 mmHg; 2.7 mmHg, 95% confidence interval) statistically significant difference in intraocular pressure 30 days after surgery between treated and fellow untreated eyes, gradually recovering to a not significant 0.2-mmHg (-0.1 mmHg; 0.4 mmHg, 95% confidence interval) difference within 26 months. The incidence of late-onset ocular hypertension was 5.7% (21 over 347, 2%; 12%, 95% confidence interval) without difference between the treated eyes and the group control. No significant difference in the incidence of late-onset ocular hypertension and sex, lens status, or gauge of vitrectomy instruments was detected. Only patient's age was significantly higher (mean difference 4.2 years; 0.1-8.0 years, Monte Carlo, 95% confidence interval) in those who developed late-onset ocular hypertension in the vitrectomized eye. Uncomplicated pars plana vitrectomy for idiopathic epiretinal membrane seems not to increase the risk of late-onset ocular hypertension or open-angle glaucoma development.

  15. Effects of maturity at harvest on the nutritive value and ruminal digestion of Eragrostis tef (cv. Moxie) when fed to beef cattle.

    Science.gov (United States)

    Vinyard, J R; Hall, J B; Sprinkle, J E; Chibisa, G E

    2018-05-18

    Teff (Eragrostis tef cv. Moxie), a warm-season annual grass, could be an excellent forage for beef cattle. However, there is limited information on its nutritive value to cattle when harvested at different stages of maturity. Thus, the objective of this research was to determine the effect of feeding teff hay harvested at the boot (BT), early-heading (EH), or late-heading (LH) stages of maturity on nutrient intake, ruminal fermentation characteristics, omasal nutrient flow, and N utilization in beef cattle. Six ruminally cannulated beef heifers (mean initial BW ± SD, 476 ± 32.6) were used in a replicated 3 × 3 Latin square design with 28-d periods (18 d for adaptation and 10 d for measurements). Dry matter intake was measured daily. Indwelling pH loggers were used to measure ruminal pH from d 21 to 28. Ruminal fluid and omasal digesta were collected from d 26 to 28 to determine fermentation characteristics and omasal nutrient flow. Fecal and urine samples to quantify N excretion were also collected (d 26 to 28). Blood samples for plasma urea-N (PUN) determination were collected 3 h post-feeding on d 28. There were no changes (P > 0.28) in the ADF or NDF content of teff with advancing maturity, but iNDF increased (P ruminal total short-chain fatty acid (SCFA) concentration, pH, digestibility and outflow of DM, OM, NDF, ADF, and CP. However, the CP content of BT hay was greater (P ruminal ammonia-N (NH3-N) concentration was greater (P ruminal NH3-N concentration, feeding beef heifers EH and LH compared to BT teff hay did not compromise ruminal digestion and outflow of DM, OM, NDF, ADF, and CP, and microbial protein synthesis. Advancing maturity in teff hay also resulted in a decrease in the excretion of total N and urine N and UUN when fed to cattle.

  16. Biometria de una población de Homalaspis plana (Milne Edwards, 1834 en Punta Maule (Coronel, Chile

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    Marco A Retamal

    1980-12-01

    Full Text Available This work deals with the bionomy of the population of Homalaspis plana (Milne Edwards, 1834 sampled in Coronel, Chile. Homalaspis plana share his biotope with: Paraxanthus barbiger (Poeppig, 1836 and Gaudichaudia gaudichaudi (Milne Edwards, 1834. A marked sexual dimorphism is apparent, the males are larger and heavier than the females; moreover, the volumes of the chelae of the first are also larger. The percentaje of the female population was significantly larger than the males population. The spawning extends from June to December. Each class of the ovigerous females, gives a different contribution, the maxima is done by the 5,74 cm class with 29,21%. The minimum size of ovigerous females is 49,3 mm L.C

  17. Pars plana vitrectomy compared with pars plana vitrectomy combined with scleral buckle in the primary management of noncomplex rhegmatogenous retinal detachment.

    Science.gov (United States)

    Orlin, Anton; Hewing, Nina J; Nissen, Michael; Lee, Sangwoo; Kiss, Szilard; DʼAmico, Donald J; Chan, R V Paul

    2014-06-01

    To compare pars plana vitrectomy (PPV) with PPV combined with scleral buckle (PPV/SB) in the treatment of primary, noncomplex rhegmatogenous retinal detachment in an academic setting. Retrospective review of 74 consecutive cases that underwent either PPV or PPV/SB for primary rhegmatogenous retinal detachment at New York Presbyterian Hospital, Weill Cornell Medical College. Fifty-two eyes underwent PPV alone while 22 eyes had PPV combined with SB. All eyes had a minimum of 2 months of follow-up. The main outcome measure was single surgery anatomical success. Patients in the PPV/SB group were less likely to be phakic (P = 0.05) and more likely to have an inferior retinal break (P = 0.001) when compared with the PPV group. Between groups, there was no difference in eyes with peripheral retinal lattice degeneration (P = 0.929), multiple breaks (P = 0.801), breaks seen preoperatively (P = 0.095), or those presenting with the macula off retinal detachment (P = 0.548). The majority of patients in both groups underwent small-gauge surgery (23 G or 25 G) (P = 0.65). Attachment of the retina was obtained in 100% of the patients in both groups at most recent follow-up. Single surgery anatomical success was similar between groups (83% PPV vs. 86% PPV/SB; P = 0.695). Mean best-corrected Snellen visual acuity improved in both groups (P = 0.75), with a final best-corrected Snellen visual acuity of 0.418 logMAR in the PPV group and 0.479 logMAR in the PPV/SB group (P = 0.61). When comparing PPV with PPV/SB, no difference in single surgery anatomical success existed after evaluating eyes with inferior breaks (P = 0.68), pseudophakia (P = 0.75), or when small-gauge surgery was performed (P = 0.76). We did not find significant differences in single surgery anatomical success, final anatomical success, or change in visual acuity when comparing PPV with PPV/SB in the repair of primary noncomplex rhegmatogenous retinal detachment in an academic setting where vitreoretinal fellows

  18. Pars Plana-Modified versus Conventional Ahmed Glaucoma Valve in Patients Undergoing Penetrating Keratoplasty: A Prospective Comparative Randomized Study.

    Science.gov (United States)

    Parihar, Jitendra Kumar Singh; Jain, Vaibhav Kumar; Kaushik, Jaya; Mishra, Avinash

    2017-03-01

    To compare the outcome of pars-plana-modified Ahmed glaucoma valve (AGV) versus limbal-based conventional AGV into the anterior chamber, in patients undergoing penetrating keratoplasty (PK) for glaucoma with coexisting corneal diseases. In this prospective randomized clinical trial, 58 eyes of 58 patients with glaucoma and coexisting corneal disease were divided into two groups. Group 1 (29 eyes of 29 patients) included patients undergoing limbal-based conventional AGV into the anterior chamber (AC) along-with PK and group 2 (29 eyes of 29 patients) included those undergoing pars-plana-modified AGV along-with PK. Outcome measures included corneal graft clarity, intraocular pressure (IOP), number of antiglaucoma medications, and postoperative complications. Patients were followed up for a minimum period of 2 years. Out of 58 eyes (58 patients), 50 eyes (50 patients: 25 eyes of 25 patients each in group 1 and group 2) completed the study and were analyzed. Complete success rate for AGV (group 1: 76%; group 2: 72%; p = 0.842) and corneal graft clarity (group 1: 68%; group 2: 76%; p = 0.081) were comparable between the two groups at 2 years. Graft failure was more in conventional AGV (32%) as compared to pars plana-modified AGV (24%) but not statistically significant (p = 0.078) at 2 years. Though both procedures were comparable in various outcome measures, pars-plana-modified AGV is a viable option for patients undergoing PK, as it provides a relatively better corneal graft survival rate and lesser complications that were associated with conventional AGV.

  19. Efficacy of Insecticide and Bioinsecticide Ground Sprays to Control Metisa plana Walker (Lepidoptera: Psychidae) in Oil Palm Plantations, Malaysia.

    Science.gov (United States)

    Salim, Hasber; Rawi, Che Salmah Md; Ahmad, Abu Hassan; Al-Shami, Salman Abdo

    2015-12-01

    The effectiveness of the synthetic insecticides trichlorfon, lambda-cyhalothrin, cypermethrin emulsion concentrated (EC) and cypermethrin emulsion water based (EW) and a bio-insecticide, Bacillus thuringiensis subsp. kurstaki (Btk), was evaluated at 3, 7, 14 and 30 days after treatment (DAT) for the control of Metisa plana larvae in an oil palm (Elaeis guineensis) plantation in Malaysia. Although all synthetic insecticides effectively reduced the larval population of M. plana, trichlorfon, lambda-cyhalothrin and cypermethrin EC were the fastest-acting. The larval population dropped below the economic threshold level (ETL) 30 days after a single application of the synthetic insecticides. Application of Btk, however, gave poor results, with the larval population remaining above the ETL post treatment. In terms of operational productivity, ground spraying using power spray equipment was time-consuming and resulted in poor coverage. Power spraying may not be appropriate for controlling M. plana infestations in large fields. Using a power sprayer, one man could cover 2-3 ha per day. Hence, power spraying is recommended during outbreaks of infestation in areas smaller than 50 ha.

  20. Bilateral optic neuropathy and intraretinal deposits after pars plana vitrectomy in amyloidosis

    Directory of Open Access Journals (Sweden)

    Rossetti Alberto

    2015-01-01

    Full Text Available Pathological examination of material from a nonextensive pars plana vitrectomy (PPV in the right eye provided a diagnosis of nonfamilial amyloidosis in a 68-year-old woman, who presented with bilateral glass wool-like vitreous opacities. Genetic testing revealed a Tyr114Cys mutation in the transthyretin gene. Six months after PPV, perimetry showed intense constriction with a temporal island and central scotoma in the right eye. An extensive PPV was performed in the left eye. Spectral domain optical coherence tomography evidenced bilateral epimacular amyloid deposits and unreported reflective spots within the inner retina. One year later, visual acuity had decreased to 20/400 in the left eye, with mild vitreous opacity, pale cupped optic disc and inferior altitudinal field defect. Bilateral diurnal intraocular pressure, transiently increased after PPV, never exceeded 16 mmHg with medication. Our patient presented optic nerve blood supply impairment, due to amyloidosis, which caused optic atrophy. Epiretinal and intraretinal deposit detection could aid in diagnosing patients with suspected amyloidosis.

  1. Intersex related gene expression profiles in clams Scrobicularia plana: Molecular markers and environmental application

    International Nuclear Information System (INIS)

    Ciocan, Corina M.; Cubero-Leon, Elena; Langston, William J.; Pope, Nick; Cornelius, Keith; Hill, E.M.; Alvarez-Munoz, Diana; Indiveri, Paolo; Lerebours, Adelaide; Minier, Christophe; Rotchell, Jeanette M.

    2015-01-01

    Highlights: • Expression of intersex-related genes was analysed in clam gonads sampled from the Channel. • Genes were differentially expressed at sites with varying levels of intersex and contaminants. • Correlations between gene expressions, key contaminants and sampling sites were identified. • No single gene expression studied correlated with intersex incidence. - Abstract: Intersex, the appearance of female characteristics in male gonads, has been identified in several aquatic species. It is a widespread phenomenon in populations of the bivalve, Scrobicularia plana, from the southwest coast of the U.K. Genes previously identified as differentially expressed (ferritin, testicular haploid expressed gene, THEG, proliferating cell nuclear antigen, PCNA; receptor activated protein kinase C, RACK; cytochrome B, CYB; and cytochrome c oxidase 1, COX1) in intersex clams relative to normal male clams, were selected for characterisation and an environmental survey of the Channel region. Transcripts were significantly differentially expressed at sites with varying intersex incidence and contaminant burdens. Significant correlations between specific gene expressions, key contaminants and sampling locations have been identified, though no single gene was associated with intersex incidence. The results highlight the difficulty in understanding the intersex phenomenon in molluscs where there is still a lack of knowledge on the control of normal reproduction

  2. Physiological status and intersex in the endobenthic bivalve Scrobicularia plana from thirteen estuaries in northwest France

    International Nuclear Information System (INIS)

    Fossi Tankoua, O.; Amiard-Triquet, C.; Denis, F.; Minier, C.; Mouneyrac, C.; Berthet, B.

    2012-01-01

    The bivalve Scrobicularia plana, an important species for the structure and functioning of estuarine and coastal mudflats, was studied in thirteen sites from NW France differing by their degree of contamination to document the presence of reproduction impairments (intersex, sex ratio, gonadosomatic indices) in relation to the condition revealed by using hepatosomatic and condition indices. In agreement with recent studies in other European estuaries, intersex was revealed in all the studied estuaries, including sites the chemical and ecological status of which is considered “good” according to the criteria of the European Water Framework Directive. The presence of endocrine disrupting chemicals (EDCs) could result in such disturbances. Our results re-inforce the concern linked to the subtle effects of EDCs, which are active at very low doses, often in the absence of any major sign of toxicity. However at this stage, no clear link may be established between intersex and population effects. - Highlights: ► Clams were collected from 13 estuaries differing by their degree of contamination. ► Gonadosomatic, hepatosomatic and condition indices were determined. ► Reproduction impairments (intersex, biased sex ratio, asynchronism) were shown. ► Intersex shown even at sites with good ecological status (Water Framework Directive). ► No clear links between intersex and populational effects. - Intersex in clams from estuaries, the chemical/ecological status of which was considered as good under the EC Water Framework Directive.

  3. Treatment of dystrophic calcification on a silicone intraocular lens with pars plana vitrectomy

    Directory of Open Access Journals (Sweden)

    Mehta N

    2014-07-01

    Full Text Available Nitish Mehta,1 Roger A Goldberg,2 Chirag P Shah21University of Massachusetts Medical School, Worcester, MA, USA; 2Department of Retina, Ophthalmic Consultants of Boston, Boston, Massachusetts, USAPurpose: Dense, vision-obscuring calcification on the posterior aspect of silicone intraocular lenses (IOLs is often not amenable to neodymium:yttrium-aluminum-garnet capsulotomy, and, in prior reports, has required IOL exchange. We report the successful removal of dense calcium deposition on the posterior surface of a three-piece silicone lens using pars plana vitrectomy (PPV.Materials and methods: A 23-gauge PPV was performed using the Stellaris® vitrectomy system. A light pipe was used to retroilluminate the IOL, and a dense fibrous tissue setting with a low cut-rate and high aspiration rate was able to clear the visual axis of the dystrophic calcification without damaging the IOL optic.Results: Visual acuity improved from 20/100 to 20/25.Conclusion: Small-gauge PPV may be utilized to remove dense dystrophic calcium deposits on the lens surface in lieu of IOL exchange. Keywords: cataract surgery, technique, Nd:YAG capsulotomy, IOL exchange

  4. Nonarteritic anterior ischemic optic neuropathy following pars plana vitrectomy for macular hole treatment: case report.

    Science.gov (United States)

    Cunha, Leonardo Provetti; Cunha, Luciana Virgínia Ferreira Costa; Costa, Carolina Ferreira; Monteiro, Mário Luiz Ribeiro

    2016-01-01

    Herein, we report a case of nonarteritic anterior ischemic optic neuropathy (NAION) following uneventful pars plana vitrectomy for macular hole treatment. A 56-year-old previously healthy woman presented with a full-thickness macular hole in right eye (OD) and small cup-to-disc ratios in both eyes. Five days after surgery, she noticed sudden painless loss of vision in OD and was found to have an afferent pupillary defect and intraocular pressure of 29 mmHg. Fundus examination showed right optic disc edema and the resolution of a macular hole with an inferior altitudinal visual field defect. Erythrocyte sedimentation rate, C-reactive protein levels, and general physical examination findings were normal. She was treated with hypotensive eyedrops and oral prednisone, resulting in mild visual improvement and a pale optic disc. A combination of face-down position and increased intraocular pressure due to a small optic disc cup were considered as potential mechanisms underlying NAION in the present case. Vitreoretinal surgeons should be aware of NAION as a potentially serious complication and be able to recognize associated risk factors and clinical findings.

  5. The origins of mercury found in the coastal aquifer of La Plana de Castellon (Eastern Spain)

    International Nuclear Information System (INIS)

    Lopez Gutierrez, J.; Garcia Menendez, O.; Ballesteros Navarro, B. J.

    2010-01-01

    Mercury was detected in the Plio-Quaternary detrital coastal aquifer of La Plana de Castellon in the second half of the 1990s in the area of Nules-Moncofar-Vall d'Uixo at concentrations of between 5 and 12 μg/L according to groundwater analysis. The most reliable hypothesis pointed originally to an anthropic origin, although no precise sources were identified. This paper describes the results of investigation undertaken by the Geological Survey of Spain (IGME) to either corroborate or reject this hypothesis. A wide sampling array was set up to collect groundwater, sediments, wastewaters and rainwater together with an exhaustive inventory of possible anthropic and natural sources of mercurial contamination. All these data were integrated into the geological and metallogenic context of the Plio-Quaternary sediments of the aquifer and the Mesozoic formations of its rim. The results have led us to arrive at a new hypothesis that points to a geogenic origin for the mercury, although is mobilisation would still appear be related to the intensive human exploitation of the groundwater in the area. (Author) 30 refs.

  6. Evaluation of pars plana sclera fixation of posterior chamber intraocular lens

    Directory of Open Access Journals (Sweden)

    Fangju Han

    2014-01-01

    Full Text Available Purpose: The purpose of this study was to evaluate the clinical efficacy and safety of modified posterior chamber intraocular lens (PCIOL implantation with transscleral fixation. Design and Setting: This is a study, which is conducted at Department of Ophthalmology, Jinan Eye Hospital, Jinan Second People′s Hospital. Materials and Methods: A total of 82 patients who were scheduled for sutured PCIOL were divided randomly into modified and conventional groups. The former underwent PCIOL through pars plana fixation with knot buried and without scleral flap and the latter underwent transscleral fixation of PCIOL in the ciliary sulcus. The main outcome measures included operative time, postoperative visual acuity, and postoperative complications. Results: The mean operative time of the modified group was 39.95 ± 5.87 min, which was significantly less than that of the conventional group (45.77 ± 5.21 min; P < 0.05. No difference was found in postoperative visual acuity between the two groups. There were no significant postoperative complications, including knot exposure, endophthalmitis, and retinal detachment in either group. The optical clamping of PCIOL was prone to occur in the conventional group. Conclusion: Modified sutured PCIOL implantation is a safe, effective, and feasible technique for the correction of aphakia in eyes without adequate posterior capsular support.

  7. New illuminations approaches with single-use micro LEDs endoilluminators for the pars plana vitrectomy

    Science.gov (United States)

    Koelbl, Philipp Simon; Koch, Frank H. J.; Lingenfelder, Christian; Hessling, Martin

    2018-02-01

    The illumination of the intraocular space during pars plana vitrectomy always bears the risk of retina damage by irradiation. Conventional illumination systems consist of an external light source and an optical fiber to transfer the visible light (radiation) into the eye. Often xenon arc and halogen lamps are employed for this application with some disadvantageous properties like high phototoxicity and low efficiency. Therefore, we propose to generate the light directly within the eye by inserting a white micro LED with a diameter of 0.6 mm. The LED offers a luminous flux of 0.6 lm of white light with a blue peak @ 450 nm and a yellow peak @ 555 nm. The presented prototypes fit through a standard 23 G trocar and are the first intraocular light sources worldwide. Two different single-use approaches have already been developed: a handguided and a chandelier device. The hand-guided applicator enables a directly navigation and illumination up to a working distance of 6 mm. The chandelier device is much smaller and does not need an active navigation of the light cone. The brightness and homogeneity of the illumination of these LED devices have been successfully tested on porcine eyes. Presented measurements and calculations prove that even for high LED currents and small distances to the retina these intraocular micro LED devices expose the retina to less hazard than conventional illumination sources like fiber based xenon systems. Even under the worst circumstances application durations of 180 hours would be justifiable.

  8. Scleral suspension pars-plana lensectomy for ectopia lentis followed by suture fixation of intraocular lens

    Directory of Open Access Journals (Sweden)

    Mitra Sandip

    2001-01-01

    Full Text Available Purpose: To describe a simple technique of scleral suspension-pars plana lensectomy (SS-PPL in acquired and congenital ectopia lentis and scleral fixation of intraocular lens (IOL. Materials and Methods: Twenty eyes of 16 patients (12 unilateral and 4 bilateral cases of "essential familial lens subluxation" aged 10-40 years (mean 25 years underwent SS-PPL with implantation of scleral fixated IOL. Indications for surgery were best-corrected visual acuity <6/18, bisection of pupil by the lens, and lens-induced glaucoma. Prerequisites for SS-PPL were, visibility of part of the lens in the pupillary area and soft lens. Results: Postoperative visual acuity ranged from 6/6 - 6/36. Lens tilt in 3 cases(15% and small decentration in 2 cases(10% were seen; however these did not seriously compromise the visual result. Scant vitreous bleeding on the first postoperative day was seen in 3 cases (15%. Conclusion: The advantages of the scleral suspension of subluxated lens prior to lensectomy include stabilization; it allows proper viewing of the lens, avoids injury to the iris and cliary body during lensectomy and reduces the possibility of dislocation of the lens.

  9. Pars Plana Vitrectomy with Internal Limiting Membrane Peeling for Nontractional Diabetic Macular Edema.

    Science.gov (United States)

    Ulrich, Jan Niklas

    2017-01-01

    Diabetes mellitus remains the leading cause of blindness among working age Americans with diabetic macular edema being the most common cause for moderate and severe vision loss. To investigate the anatomical and visual benefits of pars plana vitrectomy with inner limiting membrane peeling in patients with nontractional diabetic macular edema as well as correlation of integrity of outer retinal layers on spectral domain optical coherence tomography to visual outcomes. We retrospectively reviewed the charts of 42 diabetic patients that underwent vitrectomy with internal limiting membrane peeling for nontractional diabetic macula edema. The integrity of outer retinal layers was evaluated and preoperative central macular thickness and visual acuity were compared with data at 1 month, 3 months and 6 months postoperatively. The student t-test was used to compare the groups. 31 eyes were included. While no differences were seen at 1 and 3 months, there was significant improvement of both central macular thickness and visual acuity at the 6 months follow up visit compared to preoperatively (357, 427 microns; p=0.03. 20/49, 20/82; p=0.03) . Patients with intact external limiting membrane and ellipsoid zone had better preoperative vision than patients with outer retinal layer irregularities (20/54, 20/100; p=0.03) and greater visual gains postoperatively (20/33, ppeeling can improve retinal anatomy and visual acuity in patients with nontractional diabetic macular edema. Spectral domain optical coherence tomography may help identify patients with potential for visual improvement.

  10. Multicenter study of pars plana vitrectomy for optic disc pit maculopathy: MACPIT study.

    Science.gov (United States)

    Avci, R; Kapran, Z; Ozdek, Ş; Teke, M Y; Oz, O; Guven, D; Yilmaz, S; Kaderli, B; Durukan, A H; Sobaci, G; Unver, Y B; Akduman, L; Kaynak, S; Dogan, I; Inan, U U

    2017-09-01

    PurposeTo evaluate surgical intervention with pars plana vitrectomy (PPV) for correction of optic disc pit maculopathy (ODP-M).Patients and methodsRetrospective chart review from 13 centres of 51 eyes of 50 patients with ODP-M who underwent PPV between 2002-2014. Anatomic and final best-corrected visual acuity (BCVA) outcomes were evaluated for all cases with different adjuvant techniques.ResultsThere were 23 males and 27 females with median age 25.5 (6-68) years. Preoperative median foveal thickness was 694.5 (331-1384) μm and improved to 252.5 (153-1405) μm. Median BCVA improved from 20/200 (20/20000 to 20/40) to 20/40 (20/2000 to 20/20) with 20/40 or better in 31 eyes. Complete retinal reattachment was achieved in 44 eyes (86.3%) at 7.1 (5.9) months. The good surgical outcomes were achieved in different adjuvant groups. Median follow-up was 24 (6 to 120) months.ConclusionsThese results confirm the long-term effectiveness of PPV for ODP-M. Prospective studies are needed to determine the effectiveness of any adjuvant technique in improving the success of PPV for ODP-M.

  11. Facoemulsificação, vitrectomia via pars plana e implante de lente intra-ocular em olhos com retinopatia diabética proliferativa Phacoemulsification, pars plana vitrectomy and intraocular lens implant in eyes with proliferative diabetic retinopathy

    Directory of Open Access Journals (Sweden)

    Armando Belfort Mattos

    2004-06-01

    Full Text Available OBJETIVO: Avaliar a viabilidade da técnica de facoemulsificação para a extração da catarata com implante de lente intra-ocular combinada à vitrectomia via pars plana em olhos com retinopatia diabética proliferativa, em um único procedimento cirúrgico. MÉTODOS: Foram revisados os prontuários de 47 pacientes (53 olhos com retinopatia diabética proliferativa e catarata que foram submetidos ao procedimento combinado de vitrectomia via pars plana, facoemulsificação e implante de lente intra-ocular no mesmo ato cirúrgico, entre janeiro de 1991 e setembro de 1998 no Bascom Palmer Eye Institute, hospital de olhos filiado à Universidade de Miami. O estudo foi realizado em conjunto com a Universidade Federal de São Paulo. Participaram do estudo 43 olhos de 40 pacientes. RESULTADOS: O tempo de seguimento variou de três a 60 meses com média de 20 meses. A idade dos pacientes variou de 37 a 77 anos com média de 59 anos. A acuidade visual melhorou duas linhas ou mais em relação ao pré-operatório em 26 (60,4% olhos, permaneceu a mesma em 9 (20,9% e piorou em 8 (18,6%. Em (23,2% 10 olhos a acuidade visual aumentou para 20/40. O teste estatístico chamado de "teste do sinal" mostrou-se estatisticamente significante na melhora da acuidade visual final. A complicação mais observada foi a hemorragia vítrea recorrente, ocorrendo em 12 (27,9% olhos, seguida pela inflamação transitória da câmara anterior em 9 olhos (20,9%. Complicações intra-operatórias relacionadas à extração do cristalino foram raras. No pós-operatório observaram-se captura da lente intra-ocular em 2 (4,6 % olhos e lente intra-ocular subluxada em 1 (2,3% olho. CONCLUSÕES: A cirurgia combinada de facoemulsificação, implante de lente intra-ocular e vitrectomia via pars plana em olhos com retinopatia diabética é procedimento bem tolerado e geralmente apresenta bons resultados com relação à acuidade visual. Um único procedimento para remover a catarata e

  12. Cubiertas planas fitodepuradoras. Propuesta de gestión de aguas grises en altura

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    Gómez-González, A.

    2011-10-01

    Full Text Available The present research aims to evaluate the benefits of new urban water management strategies. In this sense, the urban conditions and the water consume habits of medium sized Spanish cities have been studied. Through the use of the large flat roof surfaces existing in medium density areas, it is possible to include industrialized phytodepuration systems which reduce the drinkable water consume and diminish the volume of waste water that is daily discharged to the sewerage network. The research shows that more than 30% of potable water is being used in domestic uses that doesn´t require this quality. The use of the proposal can reach savings up to 59% in comparison with the current water management model.

    El trabajo se presenta con el objetivo de evaluar los beneficios de la incorporación de nuevas estrategias de gestión de agua en el medio urbano. Para ello se han tenido en cuenta los condicionantes urbanos y los hábitos de consumo de agua en las ciudades españolas de tamaño medio. A través del aprovechamiento de las amplias superficies de cubierta plana existente en las áreas de media densidad, se plantea la incorporación de sistemas industrializados de fitodepuración, que permitan tanto la reducción del consumo de agua potable, como la disminución del volumen vertido a las redes de saneamiento. Los resultados de la investigación demuestran que el consumo de agua potable en usos que no lo requieren representa más del 30% del volumen total utilizado en usos domésticos, por un ciudadano medio. Mediante la aplicación de la propuesta planteada, es posible alcanzar ahorros de hasta el 59% respecto al modelo actual.

  13. Timing of Pars Plana Vitrectomy in Management of Gunshot Perforating Eye Injury: Observational Study

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    Hammouda Hamdy Ghoraba

    2016-01-01

    Full Text Available The aim of this study is to report the difference in either anatomical or functional outcome of vitreoretinal intervention in cases of gunshot perforating eye injury if done 2–4 weeks or after the 4th week after the original trauma. Patients were treated with pars plana vitrectomy and silicon oil. Surgeries were performed in the period from February 2011 until the end of December 2014. 253 eyes of 237 patients were reviewed. 46 eyes were excluded. 207 eyes of 197 patients were analyzed. The included eyes were classified based on the timing of vitrectomy in relation to the initial trauma into two groups: 149 eyes (the first group operated on between the 3rd and the 4th week and 58 eyes (the second group operated on after the 4th week after the trauma. Following one surgical intervention, in the first group, attached retina was achieved in 93.28% of patients. In the second group, attached retina was achieved in 96.55% of patients. All RD cases could be attached by a second surgery. Visual acuity improved in 81.21% of patients, did not change in 15.43% of patients, and declined in 3.35% of patients. In the second group, visual acuity improved in 81.03% of patients, did not change in 12.06% of patients, and worsened in 6.89% of patients. There was no statistically significant difference between the two groups in either anatomical or functional results. We recommend interfering before the 5th week after the trauma as retinal detachment is encountered more in cases operated on after the 4th week. The visual outcome depends on the site of entry and exit (the route of gunshot.

  14. [Proximal chemical composition and functional properties of fresh meat of crab claws (Homalaspis plana)].

    Science.gov (United States)

    Abugoch, L; Barrios, J; Guarda, A

    1996-12-01

    The research of alternative technological processes is being necessary in order to obtain a better utilization of hydrobiologic resources and food products, with higher added value. Crab (Homolaspis plana) is a crustacean found along the Chilean coast, whose flesh is exported as a frozen product. The resource crab is scantly studied in Chile and could became an excellent raw material for "delicatessen" products, with a high market value. The proximal composition, through the protein, fat, moisture and ashes content was determined. The non nitrogen extract was calculated by difference. The functional properties (water retention, emulsifying and gel-forming capacities) of fresh crab claws meat without additives were measured. The proximal composition for the claw meat was: 79,34 +/- 1.12% moisture, 16.75 +/- 1.29% protein, 1.86 +/- 0.11% ashes, 0.11 +/- 0.01 fat % and 1.93 +/- 1.07% N.N.E. In relation with the emulsifying capacity, claw meat was able to emulsify 2,259.03 +/- 73.04 g vegetal oil/g protein. The water retention was 154.49 +/- 6.85% representing the increase in mass percent; and the force of the gel formed in claw meat was 195.3 +/- 17.16 g-force x cm. According to these results, the claw crab is an attractive food, with a high protein and low fat content. Crab meat showed an excellent emulsifying capacity and water retention, so it can be used as a good raw material for the development of smearing products. In the case of gel-like products, further studies will be required, in order to optimize the conditions in which a stronger gel could be obtained.

  15. CHARACTERISTICS OF EPIRETINAL MEMBRANE REMNANT EDGE BY OPTICAL COHERENCE TOMOGRAPHY AFTER PARS PLANA VITRECTOMY.

    Science.gov (United States)

    Gaber, Raouf; You, Qi Sheng; Muftuoglu, Ilkay Kilic; Alam, Mostafa; Tsai, Frank F; Mendoza, Nadia; Freeman, William R

    2017-11-01

    To evaluate the incidence, characteristics, and the progression of epiretinal membrane (ERM) remnant edge seen by optical coherence tomography after ERM peeling. A retrospective chart review was conducted for 86 eyes of 85 consecutive patients who were diagnosed with ERM and underwent pars plana vitrectomy for epiretinal membrane peeling between 2013 and 2014. Data collected and analyzed included age, gender, preoperative and postoperative visual acuity, use of indocyanine green dye to stain internal limiting membrane, tamponade used after vitrectomy, ERM edge boundaries, presence of cystoid macular edema, and central foveal thickness. An ERM remnant edge was detected in 33/86 study eyes (38.4%) at the first postoperative optical coherence tomography scan. Compared with those without an ERM remnant, patients with an ERM remnant after surgery were significantly older at baseline and had a higher incidence of ERM recurrence at their last visit. They were not significantly different in terms of gender, preoperative and postoperative visual acuity, reduction of central foveal thickness from baseline, proportion of eyes with preoperative ERM elevation on optical coherence tomography, presence of macular edema before surgery, intraoperative use of indocyanine green staining for ILM peeling, or tamponade used. Based on the edge morphology, we classified the ERM remnant into three types: Type 1 was flat and blended with the retina (14/33 eyes, 42.4%), Type 2 was flat but stepped (17/33 eyes, 51.5%), and Type 3 was elevated (2/33 eyes, 6.0%). A significantly higher risk of ERM recurrence was seen in Type 2 and Type 3 ERM remnants (75% and 100%, respectively) than Type 1 ERM remnants (10%). An ERM remnant edge was detected by optical coherence tomography after ERM peeling in 38.4% of eyes. The presence of a postoperative ERM edge was associated with a higher risk of ERM recurrence, particularly in Type 2 and Type 3 ERM remnants.

  16. Clinical outcomes after combined Ahmed glaucoma valve implantation and penetrating keratoplasty or pars plana vitrectomy.

    Science.gov (United States)

    Lee, Jin Young; Sung, Kyung Rim; Tchah, Hung Won; Yoon, Young Hee; Kim, June Gone; Kim, Myoung Joon; Kim, Jae Yong; Yun, Sung-Cheol; Lee, Joo Yong

    2012-12-01

    To evaluate whether a combination of penetrating keratoplasty (PKP) or pars plana vitrectomy (PPV) and Ahmed glaucoma valve (AGV) implantation affords a level of success similar to that of AGV implantation alone. Eighteen eyes underwent simultaneous PPV and AGV, 14 eyes with PKP and AGV and 30 eyes with AGV implantation alone were evaluated. Success was defined as attainment of an intraocular pressure (IOP) >5 and glaucoma medication. Kaplan-Meier survival analysis was performed to compare cumulative survival between the combined surgery groups and the AGV implantation-alone group. Cox proportional hazard regression analysis was conducted to identify factors predictive of success in each of the three groups. Mean (±standard deviation) preoperative IOP was 30.2 ± 10.2 mmHg in the PKP + AGV, 35.2 ± 9.8 mmHg in the PPV + AGV, and 36.2 ± 10.1 mmHg in the AGV implantation-alone group. The cumulative success rate at 18 months was 66.9%, 73.2%, and 70.8% in the three groups, respectively. Neither combined surgery group differed significantly in terms of cumulative success rate compared with the AGV implantation-alone group (p = 0.556, p = 0.487, respectively). The mean number of preoperative anti-glaucoma medications prescribed was significantly associated with success in the PKP + AGV implantation group (hazard ratio, 2.942; p = 0.024). Either PKP or PPV performed in conjunction with AGV implantation afforded similar success rates compared to patients treated with AGV implantation alone. Therefore, in patients with refractory glaucoma who have underlying corneal or retinal pathology requiring treatment with PKP or PPV, AGV implantation can be performed simultaneously.

  17. Factors predicting visual improvement post pars plana vitrectomy for proliferative diabetic retinopathy

    Directory of Open Access Journals (Sweden)

    Evelyn Tai Li Min

    2017-08-01

    Full Text Available AIM: To identify factors predicting visual improvement post vitrectomy for sequelae of proliferative diabetic retinopathy(PDR.METHODS: This was a retrospective analysis of pars plana vitrectomy indicated for sequelae of PDR from Jan. to Dec. 2014 in Hospital Sultanah Bahiyah, Alor Star, Kedah, Malaysia. Data collected included patient demographics, baseline visual acuity(VAand post-operative logMAR best corrected VA at 1y. Data analysis was performed with IBM SPSS Statistics Version 22.0. RESULTS: A total of 103 patients were included. The mean age was 51.2y. On multivariable analysis, each pre-operative positive deviation of 1 logMAR from a baseline VA of 0 logMAR was associated with a post-operative improvement of 0.859 logMAR(P0.001. Likewise, an attached macula pre-operatively was associated with a 0.374(P=0.003logMAR improvement post vitrectomy. Absence of iris neovascularisation and absence of post-operative complications were associated with a post vitrectomy improvement in logMAR by 1.126(P=0.001and 0.377(P=0.005respectively. Absence of long-acting intraocular tamponade was associated with a 0.302(P=0.010improvement of logMAR post vitrectomy.CONCLUSION: Factors associated with visual improvement after vitrectomy are poor pre-operative VA, an attached macula, absence of iris neovascularisation, absence of post-operative complications and abstaining from use of long-acting intraocular tamponade. A thorough understanding of the factors predicting visual improvement will facilitate decision-making in vitreoretinal surgery.

  18. New process for the wastewater reclamation. ACTDisc process demonstration in the WWTP at Castellon de la Plana (Spain); Nuevos procesos de regeneracion de aguas depuradas: demostracion del proceso ACTDisc en la EDAR de Castellon de la Plana

    Energy Technology Data Exchange (ETDEWEB)

    Sanz, J.; Guerrero, L.; Ortega, J. M.; Ferrer, C.; Migeul, D.; Martinez, F.; Morenilla Martinez, J. J.; Bernacer Bonora, I.

    2006-07-01

    During May 2005, the efficiency of ACTIDis process has been rested in Castellon de la Plana WWTP, in collaboration with Fecsa and Entitat de Sanejament d'Aigues Residuals de la Generalitat Valenciana. Test purpose has been to prove the suitability of ACTIDisc process in wastewater reclamation of this WWTP secondary effluent. The aim has been, mainly, to achieve a low level of suspended solid and turbidity in compliance with the regulations proposal for direct reuse of treated effluents as AEAS guidelines suggested in 2005. (Author) 6 refs.

  19. Size dependent bioaccumulation and ecotoxicity of gold nanoparticles in an endobenthic invertebrate: The Tellinid clam Scrobicularia plana

    International Nuclear Information System (INIS)

    Pan Jinfen; Buffet, Pierre-Emmanuel; Poirier, Laurence; Amiard-Triquet, Claude; Gilliland, Douglas; Joubert, Yolaine; Pilet, Paul; Guibbolini, Marielle; Risso de Faverney, Christine; Roméo, Michèle; Valsami-Jones, Eugenia; Mouneyrac, Catherine

    2012-01-01

    Gold nanoparticles (AuNPs) have important technological applications resulting in an increased potential for release to the environment, and a greater possibility of toxicological effects. The marine bivalve Scrobicularia plana was exposed to AuNPs of size 5, 15 and 40 nm during a 16 d laboratory exposure at 100 μg Au L −1 . After exposure to AuNPs forming aggregates (>700 nm), the clams accumulated Au in their soft tissues. Biochemical (biomarkers) and behavioral (burrowing and feeding) responses were investigated. Au NPs were responsible of metallothionein induction (5, 40 nm), increased activities of catalase (15, 40 nm) and superoxide dismutase (40 nm) and of glutathione S-transferase by the three sizes of AuNPs indicating defense against oxidative stress. Exposure to AuNPs impaired burrowing behavior. However, it must be underlined that these effects were observed at a dose much higher than expected in the environment. - Highlights: ► AuNPs were aggregated to a maximum distribution peak at 0.6 μm in seawater. ► Scrobicularia plana accumulated Au with higher accumulation for bigger NPs. ► Induction of MT, CAT, SOD and GST showed oxidative stress in clams. ► TBARS levels advocated no significant oxidative damage in clams. ► Gold is an inert metal, ecotoxic effects are probably due to the nanoparticle form. - AuNPs were aggregated in seawater, Scrobicularia plana accumulated Au with higher accumulation for bigger NPs and increased activities of biomarkers showed oxidative stress.

  20. Geometry, penetration force, and cutting profile of different 23-gauge trocars systems for pars plana vitrectomy.

    Science.gov (United States)

    Meyer, Carsten H; Kaymak, Hakan; Liu, Zengping; Saxena, Sandeep; Rodrigues, Eduardo B

    2014-11-01

    To investigate the geometry, penetration force, and cutting profile of 23-gauge trocar systems for pars plana vitrectomy based on their grinding methods in a standardized laboratory setting. In this experimental study, Eleven different commercially available 23-gauge sclerotomy trocar systems were divided into 4 groups according to their needle grinding and deburring: "back" bevel, "spear" bevel, "lancet" bevel, and "spatula" bevel. The normative geometrical data of the trocar systems were systematically analyzed according to nomenclature ISO 7864 and ISO 9626. Force to penetrate a 0.4-mm thick polyurethane foil was measured by a Penetrometer, when the trocar needle was piercing, cutting, and sliding through the foil at different defined loading phases and plotted as a load-displacement diagram. Magnified images of the consecutive cut were taken under a microscope after the entire penetration through the foil. Three physicians used all trocar systems in a masked fashion on human sclera to evaluate the manual penetration force in 30° and 90°. The mean outer diameter of the trocar systems was 0.630 ± 0.009 mm, and the mean outer diameter of the trocars was 0.750 ± 0.013 mm. The mean point length was 3.11 ± 0.49 mm, and the mean length of the bevel was 1.46 ± 0.23 mm. The primary bevel angle was 10.75 ± 0.41°, and the secondary bevel angle was 65.9 ± 42.56°. The piercing forces of the back bevel and spear-pointed trocars/needles were at the same level (0.087 ± 0.028 N). The lancet-pointed needle had remarkable low piercing and cutting forces with 0.41 N (range, 0.35-0.47 N). The spatula bevel tip showed the highest penetration piercing force with 1.6 N (range, 1.59-1.73 N). The back bevel systems induced frequently triangular-shaped incisions, with two nearly rectangular cuts of short length. The spear bevels produced a regular characteristic linear cut. Especially, the lancet blade created straight cut with a linear wound apposition. Spatula trocar systems

  1. Efficacy of 23-gauge vitrectomy cutter replaeing scissors in conventional 20-gauge pars plana vitrectomy for severe PDR

    Directory of Open Access Journals (Sweden)

    Ling Gong

    2014-06-01

    Full Text Available AIM: To determine whether the 23-gauge(23Gvitrecomy cutter could replace scissors in conventional 20-gauge(20Gpars plana vitrectomy for treating severe proliferative diabetic retinopathy(PDR.METHODS:Non-comparative interventional case series. Totally 27 eyes of 27 patients with PDR stageⅥ confirmed by funduscopy and B-ultrasound scan were enrolled. They underwent 20G vitrectomy, in which 23G vitrectomy cutter replaced scissors to remove neuvascular membrane. All 27 eyes received complete panretinal photocoagulation, 17 eyes received no tamponade, 6 eyes were 12% C3F8 tamponade, 4 eyes were filled with silicone oil. The follow up time was 3mo. The operation duration time, iatrogenic retinal tear and retinal bleeding need electric coagulation, best corrected visual acuity(BCVA, retinal reattachment were analyzed.RESULTS: The operative time was 35-120(average 79.19±29.82min; intraoperative iatrogenic retinal breaks were detected in 2 eyes(7%. At the end of 3mo follow up, BCVA>0.1 were in 9 eyes, from 0.05-0.1 in 10 eyes, CONCLUSION: The 23G vitrectomy cutter could replace scissors in conventional 20G pars plana vitrectomy for treating severe PDR.

  2. The outcomes of pars plana vitrectomy without endotamponade for tractional retinal detachment secondary to proliferative diabetic retinopathy

    Directory of Open Access Journals (Sweden)

    Rao Muhammad Rashad Qamar

    2013-10-01

    Full Text Available AIM: To evaluate the outcomes of pars plana vitrectomy (PPV without the use of an ocular tamponade in patients having tractional retinal detachment (TRD secondary to proliferative diabetic retinopathy (PDR.METHODS: It was an interventional study conducted at the Department of Ophthalmology, B.V. Hospital, Bahawalpur, Pakistan, from July 2011 to July 2012. A total of 75 patients (84 eyes having TRD secondary to PDR were treated by PPV without using an ocular tamponade. All patients included in the study had a tractional retinal detachment secondary to proliferative diabetic retinopathy but didn’t have or develop retinal breaks before or during the study period. The surgical procedure included a PPV combined with the removal of the tractional retinal membranes and the application of endolaser photocoagulation to the retina. The mean follow-up period was 12 months.RESULTS:Successful retinal reattachement was observed in 78 of the operated eyes (92.8%. In these patients, the retina remained attached till the end of the one year follow-up period. Improvement in best corrected visual acuity (BCVA was seen in 63 eyes (75%. The visual acuity remained unchanged in 9 eyes (10.7%. Mean improvement in BCVA was 2.00+1.24 at baseline to 1.24+1.22 (PCONCLUSION: In the absence of the retinal breaks, a TRD secondary to PDR can be successfully treated by pars plana vitrectomy without the use of an ocular tamponade.

  3. An open, comparative clinical study on the efficacy and safety of 10% trichloroacetic acid, 25% trichloroacetic acid and cryotherapy for verruca plana.

    Science.gov (United States)

    Cengiz, Fatma Pelin; Emiroglu, Nazan

    2015-01-01

    Although there are several methods to treat Verruca plana, warts do not respond well to the common therapeutic options. In this study, we compared the safety and efficacy of 10% trichloroacetic acid, 25% trichloroacetic acid, and cryotherapy for the treatment of warts caused by Verruca plana. Ten percent and 25% trichloroacetic acid were applied to warts weekly until all lesions cleared. Cryotherapy was performed by liquid nitrogen spray for 5-10 seconds for each lesion per week until the lesions cleared. The number of Verruca plana lesions and adverse effects were evaluated five times during the treatment (the initial visit, week 2, week 4, week 6, and week 8). The number of lesions decreased through week 8 for all three treatments, and the reductions in the mean numbers of lesions were statistically similar (p > 0.05). Those in the cryotherapy group exhibited more erythema, pain, erosions, bullae, and hyperpigmentation (p cryotherapy group (p cryotherapy are effective methods to treat Verruca plana. 10% trichloroacetic acid offers a safer and easier treatment than either 25% trichloroacetic acid or cryotherapy.

  4. Case report: a novel KERA mutation associated with cornea plana and its predicted effect on protein function

    DEFF Research Database (Denmark)

    Roos, Laura; Bertelsen, Birgitte; Harris, Pernille

    2015-01-01

    individuals, hypotrichosis was found. KERA was screened for mutations using Sanger sequencing. We detected a novel KERA variant, p.(Ile225Thr), that segregates with the disease in the homozygous form. The three-dimensional structure of keratocan protein was modelled, and we showed that this missense variation...... of the keratocan gene (KERA) on chromosome 12q22. To date, only nine different disease-associated KERA mutations, including four missense mutations, have been described. Case presentation: In this report, we present clinical data from a Turkish family with autosomal recessive cornea plana. In some of the affected...... are predicted to result in destabilization of the protein. Conclusion: We present the 10th pathogenic KERA mutation identified so far. Protein modelling is a useful tool in predicting the effect of missense mutations. This case underline the importance of the leucin rich repeat domain for the protein function...

  5. Visualization of the macula during elective pars plana vitrectomy in the presence of a dual-optic accommodating intraocular lens.

    Science.gov (United States)

    Marques, Eduardo F; Ferreira, Tiago B; Castanheira-Dinis, António

    2014-05-01

    We describe the case of a 69-year-old patient who had pars plana vitrectomy (PPV) for epiretinal membrane removal 18 months after cataract surgery with implantation of a dual-optic accommodating IOL (Synchrony). During PPV, visualization of the macula was perfect, and the postoperative visual outcome was excellent. To our knowledge, this is the first report of retinal visualization during PPV in the presence of a dual-optic accommodating IOL. When choosing a presbyopia-correcting IOL, surgeons should consider the advantage of macula visualization with an IOL with monofocal optics. Dr. Marques is a consultant to Abbott Medical Optics, Inc. No other author has a financial or proprietary interest in any material or method mentioned. Copyright © 2014 ASCRS and ESCRS. Published by Elsevier Inc. All rights reserved.

  6. Seasonal variability in somatic and reproductive investment of the bivalve Scrobicularia plana (da Costa, 1778) along a latitudinal gradient

    Science.gov (United States)

    Santos, Sílvia; Cardoso, Joana F. M. F.; Carvalho, Célia; Luttikhuizen, Pieternella C.; van der Veer, Henk W.

    2011-03-01

    Monthly investment in soma and gonads in the bivalve Scrobicularia plana is described for three populations along its distributional range: Minho estuary, Portugal; Westerschelde estuary, The Netherlands and Buvika estuary, Norway. Seasonal cycles in body mass (BMI), somatic mass (SMI) and gonadal mass (GMI) indices were observed for all populations. In Portugal, BMI and SMI peaked in mid-autumn, while in The Netherlands both indices were at their highest in mid-spring. Norway showed a different pattern with two distinct peaks: one in mid-autumn and a second peak in spring. GMI reached maximum values in July in Portugal and Netherlands and in June in Norway. Overall, mean BMI and SMI were lower in Portugal while mean GMI was lower in Norway. The spawning period lasted the whole summer in Portugal, but was shorter (only two months) in The Netherlands and Norway. The reproductive investment in The Netherlands was significantly higher than in Portugal and Norway, with the lowest values being observed in Norway. Differences in annual cycles between populations were attributed to environmental factors, namely temperature and food availability. Temperature seems important in shaping the reproductive pattern with more northern populations showing shorter reproductive periods starting later in the year, and a lower reproductive output. In addition, winter water temperatures can explain the lower mean body and somatic mass values observed in Portugal. Food availability influenced the physiological performance of the species with peaks in somatic mass coinciding with phytoplankton blooms. This relation between physiological performance and environmental factors influences S. plana distribution, densities and even survival, with natural consequences on its commercial importance.

  7. Biodynamic modelling of the bioaccumulation of trace metals (Ag, As and Zn) by an infaunal estuarine invertebrate, the clam Scrobicularia plana

    International Nuclear Information System (INIS)

    Kalman, J.; Smith, B.D.; Bury, N.R.; Rainbow, P.S.

    2014-01-01

    Highlights: • Biodynamic modelling is used to predict accumulation of Ag, As and Zn in S. plana. • Dissolved and sediment-associated metals contribute to total metal bioaccumulation. • Relative importance varies with water and sediment concentrations and geochemistries. - Abstract: Biodynamic modelling was used to investigate the uptake and accumulation of three trace metals (Ag, As, Zn) by the deposit feeding estuarine bivalve mollusc Scrobicularia plana. Radioactive labelling techniques were used to quantify the rates of trace metal uptake (and subsequent elimination) from water and sediment diet. The uptake rate constant from solution (±SE) was greatest for Ag (3.954 ± 0.375 l g −1 d −1 ) followed by As (0.807 ± 0.129 l g −1 d −1 ) and Zn (0.103 ± 0.016 l g −1 d −1 ). Assimilation efficiencies from ingested sediment were 40.2 ± 1.3% (Ag), 31.7 ± 1.0% (Zn) and 25.3 ± 0.9% (As). Efflux rate constants after exposure to metals in the solution or sediment fell in the range of 0.014–0.060 d −1 . By incorporating these physiological parameters into biodynamic models, our results showed that dissolved metal is the predominant source of accumulated Ag, As and Zn in S. plana, accounting for 66–99%, 50–97% and 52–98% of total accumulation of Ag, As and Zn, respectively, under different field exposure conditions. In general, model-predicted steady state concentrations of Ag, As and Zn matched well with those observed in clams collected in SW England estuaries. Our findings highlight the potential of biodynamic modelling to predict Ag, As and Zn accumulation in S. plana, taking into account specific dissolved and sediment concentrations of the metals at a particular field site, together with local water and sediment geochemistries

  8. Five-year outcomes of pars plana vitrectomy for macular edema associated with branch retinal vein occlusion

    Directory of Open Access Journals (Sweden)

    Nishida A

    2017-02-01

    Full Text Available Akihiro Nishida,1,2 Hiroshi Kojima,1,2 Takanori Kameda,1,2 Michiko Mandai,1,3 Yasuo Kurimoto1,2 1Department of Ophthalmology, Kobe City Medical Center General Hospital, 2Department of Ophthalmology, Institute of Biomedical Research and Innovation, 3Laboratory for Retinal Regeneration, RIKEN Center for Developmental Biology, Chuo-ku, Kobe, Hyogo, Japan Purpose: Long-term outcomes of pars plana vitrectomy (PPV for macular edema (ME associated with branch retinal vein occlusion (BRVO have been previously reported, but the studies did not report the number of additional treatments after surgery. During 5 years of follow-up, we therefore investigated the efficacy and safety of PPV for BRVO and evaluated the incidence of additional treatments. Methods: We retrospectively reviewed the medical records of 25 eyes of 24 patients who underwent PPV for ME associated with BRVO and were followed up for at least 5 years. Best-corrected visual acuity was measured, and foveal thickness was assessed by optical coherence tomography. Additional treatments were also investigated. Results: The logarithm of the minimal angle of resolution (logMAR improved from 0.53±0.23 at baseline to 0.16±0.25 at 5 years (P<0.0001. The foveal thickness decreased from 535±222 µm at baseline to 205±143 µm at 5 years (P<0.0001. For the eyes with residual ME, the following additional treatments were performed within 5 years of follow-up: sub-Tenon injection of triamcinolone acetonide in two eyes, intravitreal injection of bevacizumab in three eyes, grid laser photocoagulation in one eye, and direct photocoagulation of macroaneurysm in one eye. Additional surgeries were performed in two eyes: for one eye, phacoemulsification extraction of the ocular lens and intraocular lens implantation were performed because of cataract progression, and for the other eye, additional PPV was done for postoperative retinal detachment. Conclusion: PPV was effective for resolution of ME

  9. How life history influences the responses of the clam Scrobicularia plana to the combined impacts of carbamazepine and pH decrease

    International Nuclear Information System (INIS)

    Freitas, Rosa; Almeida, Ângela; Calisto, Vânia; Velez, Cátia; Moreira, Anthony; Schneider, Rudolf J.; Esteves, Valdemar I.; Wrona, Frederick J.; Soares, Amadeu M.V. M.; Figueira, Etelvina

    2015-01-01

    In the present study, the bivalve Scrobicularia plana, collected from two contrasting areas (pristine location and mercury contaminated area), was selected to assess the biochemical alterations imposed by pH decrease, carbamazepine (an antiepileptic) and the combined effect of both stressors. The effects on oxidative stress related biomarkers after 96 h exposure revealed that pH decrease and carbamazepine induced alterations on clams, with greater impacts on individuals from the contaminated area which presented higher mortality, higher lipid peroxidation and higher glutathione S-transferase activity. These results emphasize the risk of extrapolating results from one area to another, since the same species inhabiting different areas may be affected differently when exposed to the same stressors. Furthermore, the results obtained showed that, when combined, the impact of pH decrease and carbamazepine was lower than each stressor acting alone, which could be related to the defence mechanism of valves closure when bivalves are under higher stressful conditions. - Highlights: • Environmentally relevant concentrations of CBZ and pH 7.1 impacted the performance of Scrobicularia plana. • The combination of CBZ and pH 7.1 did not induce higher impacts compared with stressors acting alone. • Clams from a polluted area showed greater alterations than clams collected from an unpolluted area. - pH decrease and carbamazepine induced biochemical alterations on clams (Scrobicularia plana), with greater impacts on individuals from the contaminated area

  10. The impacts of pharmaceutical drugs under ocean acidification: New data on single and combined long-term effects of carbamazepine on Scrobicularia plana.

    Science.gov (United States)

    Freitas, Rosa; Almeida, Ângela; Calisto, Vânia; Velez, Cátia; Moreira, Anthony; Schneider, Rudolf J; Esteves, Valdemar I; Wrona, Frederick J; Figueira, Etelvina; Soares, Amadeu M V M

    2016-01-15

    Ocean acidification and increasing discharges of pharmaceutical contaminants into aquatic systems are among key and/or emerging drivers of environmental change affecting marine ecosystems. A growing body of evidence demonstrates that ocean acidification can have direct and indirect impacts on marine organisms although combined effects with other stressors, namely with pharmaceuticals, have received very little attention to date. The present study aimed to evaluate the impacts of the pharmaceutical drug Carbamazepine and pH 7.1, acting alone and in combination, on the clam Scrobicularia plana. For this, a long-term exposure (28 days)was conducted and a set of oxidative stress markers was investigated. The results obtained showed that S. plana was able to develop mechanisms to prevent oxidative damage when under low pH for a long period, presenting higher survival when exposed to this stressor compared to CBZ or the combination of CBZ with pH 7.1. Furthermore, the toxicity of CBZ on S. plana was synergistically increased under ocean acidification conditions (CBZ + pH 7.1): specimens survival was reduced and oxidative stress was enhanced when compared to single exposures. These findings add to the growing body of evidence that ocean acidification will act to increase the toxicity of CBZ to marine organisms,which has clear implications for coastal benthic ecosystems suffering chronic pollution from pharmaceutical drugs.

  11. Pistas planas en el tratamiento de la clase II: Presentación de un caso Flat strips in the treatment of class II malocclusion.: A case report

    Directory of Open Access Journals (Sweden)

    Yulenia Cruz Rivas

    2005-12-01

    Full Text Available La maloclusión clase II división 1 es una de las anomalías que se presentan en las consultas de Ortodoncia con mayor frecuencia. Para solucionar esta problemática se han descrito diversos tratamientos. Se muestra un caso tratado mediante ortopedia funcional, específicamente con pistas planas de clase II, aparato funcional ideado por Pedro Planas , basado en la rehabilitación neuroclusal . Los resultados demuestran la efectividad de dicho aparato, pues se aprecian cambios a favor de la armonía esqueletal , la estética y la función, así como las modificaciones transversales que fueron alentadores. Dentro de los cambios esqueletales , se observó la apertura del eje facial y el aumento de la altura facial anteroinferior .Division 1 class II malocclusion is one of the abnormalities that are present in the Orthodontics offices more frequently. Different treatments have been described to solve this problem. A case treated by functional orthopedics, specifically with class II flat strips, an appliance created by Pedro Planas that is based on neuroocclusal rehabilitation, is reported. The results show the effectiveness of this appliance, since changes in favor of skeletal harmony, aesthetics and function are observed, and the transversal modifications are encouraging. The opening of the facial axis and the increase of the anteroinferior facial height are observed among the skeletal changes.

  12. Surgical outcomes of 23-gauge transconjunctival pars plana vitrectomy combined with lensectomy for glaucomatous eyes with extremely shallow anterior chamber and cataract.

    Science.gov (United States)

    Zhang, Zhaotian; Zhang, Shaochong; Jiang, Xintong; Qiu, Suo; Wei, Yantao

    2016-01-04

    Glaucoma combined with an extremely shallow anterior chamber and cataracts remains as a complex condition to deal with. And the emergence of microincision vitrectomy surgery (MIVS) system may provide an ideal option for the treatment of that. We report a clinical study of surgical outcomes of 23-gauge transconjunctival pars plana vitrectomy (PPV) combined with lensectomy in the treatment of glaucomatous eyes with extremely shallow anterior chamber and cataract. Prospective, nonrandomized and noncomparative case series study. Consecutive patients with secondary glaucoma, extremely shallow anterior chamber and cataract were recruited to have combined surgeries of 23-gauge transconjunctival pars plana vitrectomy and lensectomy. The main outcomes were best corrected visual acuity (BCVA), intraocular pressure (IOP), anterior chamber depth (ACD), number of anti-glaucoma medications and surgery-associated complications. Seventeen consecutive patients with secondary glaucoma, extremely shallow anterior chamber and cataract were recruited. The mean follow-up was 21.2 ± 8.8 months. Postoperatively, there was no significant improvement of BCVA (P = 0.25). The mean intraocular (IOP) decreased significantly from 43.14 ± 6.53 mmHg to 17.29 ± 1.80 mmHg (P shallow anterior chamber and cataract can be managed well with the combined surgeries of 23-gauge pars plana vitrectomy and lensectomy. The surgical procedure is an effective and safe method to resolve the pupillary block and deepen the anterior chamber.

  13. MRI in patients with tuberculous spondylitis presenting as vertebra plana: A retrospective analysis and review of literature

    International Nuclear Information System (INIS)

    Sureka, J.; Samuel, S.; Keshava, S.N.; Venkatesh, K.; Sundararaj, G.D.

    2013-01-01

    Aim: To present the magnetic resonance imaging (MRI) findings of 10 patients with histopathologically proven tuberculous spondylitis (TS) presenting as vertebra plana (VP) on radiographs. Material and methods: Radiographs of 451 adult TS patients were reviewed. In this consecutive series, there were 11 patients who presented as VP. MRI of 10 of these patients was available for review. Results: VP-like collapse of a single vertebral body of the dorsal spine with preserved endplates and disc was seen in all cases. Epidural, pre- and para-vertebral soft tissue was found in all patients. Epidural soft tissue presenting on sagittal images as a convexity of the posterior longitudinal ligament was also found in all the signal of which was different from the involved vertebra on axial images. All patients showed posterior element involvement, which was characterized by preserved cortical outline without expansion. Conclusion: TS presenting with VP-like collapse of the bone is rare, accounting for 2.4% of the cases in the present series. MRI may show a collapsed vertebra with preserved endplates and disc. MRI findings that are suggestive of TS include: (1) signal intensity of the epidural soft-tissue mass on axial images, which is different from the vertebral body; (2) presence of a thin, T2-weighted hypointense capsule of the para-vertebral soft tissue; (3) posterior element involvement characterized by intact hypointense cortical outline without expansion; and (4) involvement of the costovertebral joint.

  14. Early simultaneous fundus autofluorescence and optical coherence tomography features after pars plana vitrectomy for primary rhegmatogenous retinal detachment.

    Science.gov (United States)

    Dell'Omo, Roberto; Mura, Marco; Lesnik Oberstein, Sarit Y; Bijl, Heico; Tan, H Stevie

    2012-04-01

    To describe fundus autofluorescence and optical coherence tomography (OCT) features of the macula after pars plana vitrectomy for rhegmatogenous retinal detachment. Thirty-three eyes of 33 consecutive patients with repaired rhegmatogenous retinal detachment with or without the involvement of the macula were prospectively investigated with simultaneous fundus autofluorescence and OCT imaging using the Spectralis HRA+OCT (Heidelberg Engineering, Heidelberg, Germany) within a few weeks after the operation. Fundus autofluorescence imaging of the macula showed lines of increased and decreased autofluorescence in 19 cases (57.6%). On OCT, these lines corresponded to the following abnormalities: outer retinal folds, inner retinal folds, and skip reflectivity abnormalities of the photoreceptor inner segment/outer segment band. Other OCT findings, not related to abnormal lines on fundus autofluorescence, consisted of disruption of photoreceptor inner segment/outer segment band and collection of intraretinal or subretinal fluid. The presence of outer retinal folds significantly related to metamorphopsia but did not relate to poor postoperative visual acuity. Partial-thickness retinal folds occur commonly after vitrectomy for rhegmatogenous retinal detachment repair and may represent an important anatomical substrate for postoperative metamorphopsia. Fundus autofluorescence and OCT are both sensitive techniques for the detection of these abnormalities.

  15. Ultrastructural and histopathologic findings after pars plana vitrectomy with a new hypersonic vitrector system. Qualitative preliminary assessment.

    Directory of Open Access Journals (Sweden)

    Salvador Pastor-Idoate

    Full Text Available Preliminary assessment of a new prototype ultrasound-based hypersonic vitrector (HV by qualitatively examining the histopathological changes in the retina and vitreous body after pars plana vitrectomy (PPV and its ability to fragment vitreous collagen.Fourteen porcine cadaveric eyes, 20 eyes in live swine and six human cadaveric eyes underwent PPV using the HV or a pneumatic guillotine vitrector (GV. An additional 4 porcine crystalline lenses were touched with either the HV or GV for 1 minute. Following PPV, human vitreous was removed and processed for electron microscopy (EM. Eyes and lenses were fixed and sectioned for light microscopy (LM.There were no macroscopic retinal or optic nerve defects associated with either HV or GV PPVs. Cadaveric retinal specimens showed separation of the inner limiting membrane (ILM and vacuolization and fragmentation at the nerve fiber layer (NFL and the ganglion cell layer (GCL. ILM fragmentation and separation were found after PPV in live swine with both vitrectors. Small disruptions of the posterior capsule or structural lens defects were found after HV touch. The EM analysis revealed more fragmentation of human vitreous collagen fibrils after HV compared to GV PPV.LM and EM analysis of retina, vitreous, and crystalline lens after PPV showed similar morphological changes using the HV or the GV. Vitreous fragmentation appeared more effective with the HV. Overall this study suggests that the HV may be a promising new technology. More work is needed to quantitatively assess its safety and efficacy.

  16. Intraoperative optical coherence tomography in macula involving rhegmatogenous retinal detachment repair with pars plana vitrectomy and perfluoron.

    Science.gov (United States)

    Toygar, O; Riemann, C D

    2016-01-01

    PurposeTo investigate microanatomical relationships during surgical repair of macula involving retinal detachment with pars plana vitrectomy (PPV) and perfluoron (PFO) with a microscope-integrated intraoperative optical coherence tomography (iOCT) device.Patients and methodsThis consecutive case series included nine eyes of nine patients with macula involving retinal detachment operated by a single surgeon at the Cincinnati Eye Institute. All patients underwent PPV, PFO injection, endolaser, and air-fluid exchange. The macula was imaged with iOCT before PFO injection, after PFO injection, and after air-fluid exchange in all eyes.ResultsiOCT imaging was ergonomically easy to obtain in all eyes. iOCT clearly demonstrated submacular fluid (SMF) at the beginning of the surgery, macular flattening under PFO in all eyes, small residual SMF under PFO in six of nine eyes, and increased occult SMF following air-fluid exchange in all eyes.ConclusionMicroscope-integrated iOCT is a versatile and powerful imaging modality that holds a great deal of promise in the future. Its confirmation of persistent occult SMF in this small series of macular involving retinal detachment repair with PFO, may inform surgical decision making, and demonstrates a pathophysiological rationale for initial face-down positioning after retinal detachment repair.

  17. A retrospective study comparing outcomes of primary rhegmatogenous retinal detachment repair by scleral buckling and pars plana vitrectomy in Finland.

    Science.gov (United States)

    Sahanne, Sari; Tuuminen, Raimo; Haukka, Jari; Loukovaara, Sirpa

    2017-01-01

    Rhegmatogenous retinal detachment (RRD) is the most common form of retinal detachment and an ophthalmic emergency. Here, we compared outcomes of primary RRD eyes operated with conventional scleral buckling (SB) with cryoretinopexy to those operated with standard pars plana vitrectomy (PPV). This is an institutional, retrospective, register-based, observational, comparative study. Based on the surgical procedure, 319 eyes of 319 patients were divided into two groups: SB plus cryotherapy (n=50) and PPV (n=269). Changes in intraocular pressure (IOP) and best-corrected visual acuity (BCVA) were recorded at 30 days and reoperation rates within 180 days postoperatively. Eyes operated with PPV had less reoperations within the first 180 days as compared with SB eyes ( P =0.001, log-rank test); however, changes in IOP were more prominent (mean ± standard deviation: +8.1±8.8 vs. +4.4±7.0 mmHg, respectively; P =0.006). Changes in BCVA did not differ between the surgical procedures. PPV was associated with higher primary anatomic success rates and lower risk of reoperation but significant IOP elevation when compared to SB. These factors should be case-specifically considered when choosing treatment modality for primary RRD.

  18. Eccentric Macular Hole after Pars Plana Vitrectomy for Epiretinal Membrane Without Internal Limiting Membrane Peeling: A Case Report.

    Science.gov (United States)

    Garnavou-Xirou, Christina; Xirou, Tina; Kabanarou, Stamatina; Gkizis, Ilias; Velissaris, Stavros; Chatziralli, Irini

    2017-12-01

    Postoperative eccentric macular hole formation is an uncommon complication after pars plana vitrectomy (PPV) without internal limiting membrane (ILM) peeling for the treatment of epiretinal membrane (ERM). We present a case of eccentric macular hole formation after PPV for ERM without ILM peeling. A 68-year-old male patient presented with ERM and visual acuity of 6/24 in his left eye. He underwent 23-gauge PPV without ILM peeling for treatment of ERM. One week postoperatively the retina was attached and the epiretinal membrane was successfully removed, while visual acuity was 6/9. One month after PPV, a single eccentric retinal hole below the macula was detected using fundoscopy and subsequently confirmed by optical coherence tomography. At this time the visual acuity was 6/9 and the patient reported no symptoms. No further intervention was attempted and at the 9-month follow-up, the visual acuity and the size of the eccentric macular hole remained stable. Eccentric macular holes can be developed after PPV even without ILM peeling and are usually managed conservatively by observation.

  19. Long-term outcomes of pars plana vitrectomy without internal limiting membrane peeling for optic disc pit maculopathy.

    Science.gov (United States)

    Avci, R; Yilmaz, S; Inan, U U; Kaderli, B; Kurt, M; Yalcinbayir, O; Yildiz, M; Yucel, A

    2013-12-01

    To evaluate the results of surgical treatment of maculopathy secondary to congenital optic pit anomaly with pars plana vitrectomy (PPV), endolaser to the temporal edge of the optic disc and C3F8 tamponade without internal limiting membrane (ILM) peeling. Thirteen eyes of 12 patients with serous macular detachment and/or macular retinoschisis secondary to congenital optic disc pit (ODP) were included in the study. All eyes underwent PPV, posterior hyaloid removal, endolaser photocoagulation on the temporal margin of the optic disc and 12% C3F8 gas tamponade. Anatomic success and functional outcome determined retrospectively by optical coherence tomography and measurement of best corrected visual acuity (BCVA), respectively were the main outcome parameters. Two lines or more improvement in BCVA was obtained in 11 eyes and 6 of these eyes had 20/40 or better BCVA at the final visit. Subretinal or intraretinal fluid was completely resorbed postoperatively in 12 eyes but a little intraretinal fluid persisted in one eye at the 16-month follow-up. Better visual improvement was observed in patients treated by earlier surgical intervention. PPV, C3F8 gas tamponade and endolaser to the optic disc margin without ILM peeling may yield favourable results in the treatment of ODP maculopathy.

  20. Valved versus nonvalved cannula small-gauge pars plana vitrectomy for repair of retinal detachments with Grade C proliferative vitreoretinopathy

    Directory of Open Access Journals (Sweden)

    Oellers P

    2016-05-01

    Full Text Available Patrick Oellers, Sandra Stinnett, Paul Hahn Duke Eye Center, Duke University School of Medicine, Durham, NC, USA Purpose: Valved cannulas are a recent addition to small-gauge pars plana vitrectomy (PPV and provide stable intraocular fluidics. The goal of this study was to compare outcomes and postoperative complication rates of valved vs nonvalved cannula small-gauge PPV for repair of retinal detachments (RDs complicated by Grade C proliferative vitreoretinopathy (PVR.Methods: A retrospective chart review of 364 consecutive eyes with either valved or nonvalved cannula PPV for RD repair was performed. The primary outcomes were single surgery and final anatomic success and change in best-corrected visual acuity for repair of RDs complicated by Grade C PVR.Results: We identified 36 eyes in the valved group and 31 eyes in the nonvalved group with Grade C PVR RD. The single surgery success was 83% vs 77% (P=0.555 and the final anatomic success was 94% vs 87% (P=0.404 in the valved vs nonvalved eyes, respectively. The mean final visual acuity gain was −0.36 logarithm of the minimum angle of resolution (logMAR; approximate Early Treatment Diabetes Retinopathy Study [ETDRS] score =17 letters in valved eyes vs −0.33 logMAR (approximate ETDRS score =16 letters in nonvalved eyes (P=0.81. Postoperative complication rates including postoperative day 1 hypotony, hypertony, and anterior chamber fibrin formation; postoperative retention of intraocular or subretinal perfluorocarbon liquid; and subsequent epiretinal membrane peel were not statistically different between groups.Conclusion: Valved cannula PPV yields equivalent visual acuity and anatomic outcomes without increased postoperative complication rates compared to traditional nonvalved cannula PPV for Grade C PVR-associated RD repair. Keywords: 23 gauge, 25 gauge, PVR, RD, chronic, single surgery success, final anatomic success

  1. Diseño de un colector solar de placa plana; Design of a Solar Flat Plate Collector

    Directory of Open Access Journals (Sweden)

    Jeovany Rafael Rodríguez Mejía

    2015-12-01

    Full Text Available En el presente artículo se integra el uso de un software de diseño mecánico y un algoritmo de simulación de la operación de un colector solar de placa plana, con el objetivo de simplificar el proceso de diseño y manufactura de este último. Se exponen los resultados de la simulación de la operación del colector solar considerando diferentes combinaciones en los parámetros de los materiales utilizados, tales como sus propiedades y características físico químicas, además de la variación de las dimensiones del sistema adiseñar. Finalmente en el artículo se evalúa la operación de un colector solar para las condiciones climatológicas típicas de la irradiancia, velocidad de viento y temperatura ambiente a partir de una serie de curvas sinusoidales, típicas de Cuba, validándose la viabilidad del algoritmo como apoyo en la etapa de diseño y selección de materiales.In this article the use of mechanical design software and an algorithm for simulating the operation of a flat plate solar collector, with the objective of simplifying the process of design and manufacture of the latter isintegrated. The simulation results of the operation of the solar collector considering different combinations in the parameters of the materials used, such as its physicochemical properties and features in addition to thevariation of the dimensions of the system design are set. The article finally evaluates the operation of a solar collector for typical climatic conditions of irradiance, wind speed and ambient temperature from a series ofsinusoidal, typical Cuba curves is evaluated, validating the feasibility of the algorithm as support in step design and material selection.

  2. Biochemical and behavioural responses of the endobenthic bivalve Scrobicularia plana to silver nanoparticles in seawater and microalgal food.

    Science.gov (United States)

    Buffet, Pierre-Emmanuel; Pan, Jin-Fen; Poirier, Laurence; Amiard-Triquet, Claude; Amiard, Jean-Claude; Gaudin, Pierre; Risso-de Faverney, Christine; Guibbolini, Marielle; Gilliland, Douglas; Valsami-Jones, Eugenia; Mouneyrac, Catherine

    2013-03-01

    Because of their bactericidal effects, Ag nanoparticles (Ag NPs) have promising industrial development but could lead to potential ecological risks. The aim of this study was to examine the uptake and effect of silver (soluble or as lactate Ag NPs of 40 nm) at low concentrations (10 μg L(-1)) in the endobenthic bivalve Scrobicularia plana exposed, for 14 days, directly (water) or via the diet (microalgae). The stability of Ag NPs in seawater was examined using dynamic light scattering. Release of soluble Ag from Ag NPs in the experimental media was quantified by using diffusive gradient in thin film. Bioaccumulation of Ag in bivalves was measured by electrothermal atomic absorption spectrometry. Behavioural and biochemical biomarkers were determined in bivalves. Aggregation of Ag NPs and the release of soluble Ag from Ag NPs were observed in the experimental media. For both forms of Ag, bioaccumulation was much more important for waterborne than for dietary exposure. The response of oxidative stress biomarkers (catalase, glutathion S-transferase, superoxide dismutase) was more important after dietary than waterborne exposure to Ag (soluble and NPs). These defences were relatively efficient since they led to a lack of response of damage biomarkers. Burrowing was not affected for bivalves exposed directly or through the diet to both Ag forms but feeding behaviour was impaired after 10 days of dietary exposure. Since no differences of responses to Ag either soluble or nanoparticulate were observed, it seems that labile Ag released from Ag NPs was mainly responsible for toxicity. Copyright © 2012 Elsevier Inc. All rights reserved.

  3. Simulación y experimentación de laminación plana de placas de aluminio 6063

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    Teresa Robert

    2011-06-01

    Full Text Available An experimental methodology was generated for understanding the theoretical and practical concepts inherent to cold flat rolling. Aluminium slabs about 100 mm length, 9 mm thickness with different widths: 10 and 30 mm were rolled. A constant 0.3 mm thickness reduction step was performed in order to achieve a thickness reduction greater than 80 %. In the Abaqus® commercial software, a mathematical model was implemented in order to obtain a greater understanding concerning how the process variables affect the fields of stresses and strains that are not observed experimentally. It was found, by mathematical simulation, that a superficial hardening in the plates was produced and the deformation obtained is heterogeneous, which is corroborated physically. Keywords: Flat rolling; 6063 Aluminium; Data acquisition system; Simulation Se generó una metodología experimental para el entendimiento teórico-práctico de los conceptos del proceso de laminación plana en frío. Se laminaron placas de aluminio de aproximadamente 100 mm de longitud y 9 mm de espesor, a diferentes anchos: 10 y 30 mm. Se seleccionó una razón de reducción constante de 0.3 mm para cada paso de laminación, hasta lograr una reducción superior al 80 % en espesor. Se implementó un modelo matemático en el paquete comercial Abaqus® con el fin de obtener un mayor entendimiento sobre la influencia de las variables del proceso (fuerza aplicada y dimensiones de las probetas en los campos de esfuerzos y deformaciones que, experimentalmente, no se pueden observar. Se encontró, mediante la simulación matemática, que se produce un endurecimiento superficial en las placas y que la deformación obtenida es heterogénea, lo cual se corrobora físicamente.

  4. A retrospective study comparing outcomes of primary rhegmatogenous retinal detachment repair by scleral buckling and pars plana vitrectomy in Finland

    Directory of Open Access Journals (Sweden)

    Sahanne S

    2017-03-01

    Full Text Available Sari Sahanne,1 Raimo Tuuminen,2 Jari Haukka,3 Sirpa Loukovaara4 1Department of Anesthesiology, Helsinki University Central Hospital, Helsinki, 2Department of Ophthalmology, Kymenlaakso Central Hospital, Kotka, 3Hjelt Institute, Faculty of Medicine, University of Helsinki, 4Unit of Vitreoretinal Surgery, Department of Ophthalmology, Helsinki University Central Hospital, University of Helsinki, Helsinki, Finland Background: Rhegmatogenous retinal detachment (RRD is the most common form of retinal detachment and an ophthalmic emergency. Here, we compared outcomes of primary RRD eyes operated with conventional scleral buckling (SB with cryoretinopexy to those operated with standard pars plana vitrectomy (PPV. Methods: This is an institutional, retrospective, register-based, observational, comparative study. Based on the surgical procedure, 319 eyes of 319 patients were divided into two groups: SB plus cryotherapy (n=50 and PPV (n=269. Changes in intraocular pressure (IOP and best-corrected visual acuity (BCVA were recorded at 30 days and reoperation rates within 180 days postoperatively. Results: Eyes operated with PPV had less reoperations within the first 180 days as compared with SB eyes (P=0.001, log-rank test; however, changes in IOP were more prominent (mean ± standard deviation: +8.1±8.8 vs. +4.4±7.0 mmHg, respectively; P=0.006. Changes in BCVA did not differ between the surgical procedures. Conclusion: PPV was associated with higher primary anatomic success rates and lower risk of reoperation but significant IOP elevation when compared to SB. These factors should be case-specifically considered when choosing treatment modality for primary RRD. Keywords: rhegmatogenous retinal detachment, vitrectomy, scleral buckling

  5. Biodynamic modelling of the bioaccumulation of trace metals (Ag, As and Zn) by an infaunal estuarine invertebrate, the clam Scrobicularia plana

    Energy Technology Data Exchange (ETDEWEB)

    Kalman, J., E-mail: judit.kalman@uca.es [Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD (United Kingdom); Smith, B.D. [Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD (United Kingdom); Bury, N.R. [Division of Diabetes and Nutritional Science, King' s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH (United Kingdom); Rainbow, P.S. [Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD (United Kingdom)

    2014-09-15

    Highlights: • Biodynamic modelling is used to predict accumulation of Ag, As and Zn in S. plana. • Dissolved and sediment-associated metals contribute to total metal bioaccumulation. • Relative importance varies with water and sediment concentrations and geochemistries. - Abstract: Biodynamic modelling was used to investigate the uptake and accumulation of three trace metals (Ag, As, Zn) by the deposit feeding estuarine bivalve mollusc Scrobicularia plana. Radioactive labelling techniques were used to quantify the rates of trace metal uptake (and subsequent elimination) from water and sediment diet. The uptake rate constant from solution (±SE) was greatest for Ag (3.954 ± 0.375 l g{sup −1} d{sup −1}) followed by As (0.807 ± 0.129 l g{sup −1} d{sup −1}) and Zn (0.103 ± 0.016 l g{sup −1} d{sup −1}). Assimilation efficiencies from ingested sediment were 40.2 ± 1.3% (Ag), 31.7 ± 1.0% (Zn) and 25.3 ± 0.9% (As). Efflux rate constants after exposure to metals in the solution or sediment fell in the range of 0.014–0.060 d{sup −1}. By incorporating these physiological parameters into biodynamic models, our results showed that dissolved metal is the predominant source of accumulated Ag, As and Zn in S. plana, accounting for 66–99%, 50–97% and 52–98% of total accumulation of Ag, As and Zn, respectively, under different field exposure conditions. In general, model-predicted steady state concentrations of Ag, As and Zn matched well with those observed in clams collected in SW England estuaries. Our findings highlight the potential of biodynamic modelling to predict Ag, As and Zn accumulation in S. plana, taking into account specific dissolved and sediment concentrations of the metals at a particular field site, together with local water and sediment geochemistries.

  6. Comparison of the Effectiveness of Pars Plana Vitrectomy with and without Internal Limiting Membrane Peeling for Idiopathic Retinal Membrane Removal: A Meta-Analysis

    Science.gov (United States)

    Liu, Hanhan; Zuo, Shanru; Ding, Chun; Dai, Xunzhang; Zhu, Xiaohua

    2015-01-01

    We conducted a meta-analysis of published retrospective studies and compared the effectiveness of pars plana vitrectomy with and without internal limiting membrane (ILM) peeling for idiopathic epiretinal membrane (IERM). The results revealed that patients in the IERM+ILM peeling group had better BCVA after surgery within 12 months than those in IERM peeling group. But patients in the IERM peeling group showed better BCVA in the 18th month. More retrospective studies or randomized controlled trials are required to investigate and compare the long-term effect of IERM removal with and without ILM peeling. PMID:26693348

  7. Pars plana vitrectomy combined with internal limiting membrane peeling for recurrent macular edema due to branch retinal vein occlusion after antivascular endothelial growth factor treatments

    Directory of Open Access Journals (Sweden)

    Shirakata Y

    2016-02-01

    Full Text Available Yukari Shirakata,1 Kouki Fukuda,1 Tomoyoshi Fujita,1 Yuki Nakano,1 Hiroyuki Nomoto,2 Hidetaka Yamaji,3 Fumio Shiraga,4 Akitaka Tsujikawa1 1Department of Ophthalmology, Faculty of Medicine, Kagawa University, Miki-cho, 2Nomoto Eye Clinic, Himeji, 3Department of Ophthalmology, Shirai Eye Hospital, Mitoyo, 4Department of Ophthalmology, Okayama University, Okayama, Japan Purpose: To evaluate the anatomic and functional outcomes of pars plana vitrectomy combined with internal limiting membrane peeling for recurrent macular edema (ME due to branch retinal vein occlusion (BRVO after intravitreal injections of antivascular endothelial growth factor (anti-VEGF agents. Methods: Twenty-four eyes of 24 patients with treatment-naive ME from BRVO were treated with intravitreal injections of anti-VEGF agents. Recurred ME was treated with pars plana vitrectomy combined with internal limiting membrane peeling. Results: After the surgery, ME was significantly reduced at 1 month (P=0.031 and the reduction increased with time (P=0.007 at the final visit. With the reduction in ME, treated eyes showed a slow improvement in visual acuity (VA. At the final visit, improvement in VA was statistically significant compared with baseline (P=0.048. The initial presence of cystoid spaces, serous retinal detachment, or subretinal hemorrhage under the fovea, as well as retinal perfusion status, showed no association with VA improvement. However, the presence of epiretinal membrane showed a significant association with the visual recovery. Although eyes without epiretinal membrane showed visual improvement (-0.10±0.32 in logarithm of the minimum angle of resolution [logMAR], eyes with epiretinal membrane showed greater visual improvement (-0.38±0.12 in logMAR, P=0.012. Conclusion: For recurrent ME due to BRVO after anti-VEGF treatment, particularly when accompanied by epiretinal membrane, pars plana vitrectomy combined with internal limiting membrane peeling might be a

  8. Comparison of the Effectiveness of Pars Plana Vitrectomy with and without Internal Limiting Membrane Peeling for Idiopathic Retinal Membrane Removal: A Meta-Analysis

    Directory of Open Access Journals (Sweden)

    Hanhan Liu

    2015-01-01

    Full Text Available We conducted a meta-analysis of published retrospective studies and compared the effectiveness of pars plana vitrectomy with and without internal limiting membrane (ILM peeling for idiopathic epiretinal membrane (IERM. The results revealed that patients in the IERM+ILM peeling group had better BCVA after surgery within 12 months than those in IERM peeling group. But patients in the IERM peeling group showed better BCVA in the 18th month. More retrospective studies or randomized controlled trials are required to investigate and compare the long-term effect of IERM removal with and without ILM peeling.

  9. Optic neuropathy causing vertical unilateral hemianopsia after pars plana vitrectomy for a macular hole: A case report.

    Science.gov (United States)

    Kawashima, Hirohiko; Nagai, Norihiro; Shinoda, Hajime; Tsubota, Kazuo; Ozawa, Yoko

    2018-04-01

    Recent progress in medical technology has resulted in improved surgical outcomes of pars plana vitrectomy (PPV); with microincision systems, the incidence of procedure-related complications during surgery has been reduced. However, unpredictable visual field defects after PPV remain an unresolved issue. A few reports have shown that damage to the retinal neurofibers owing to dry-up during air/fluid exchange or retinal neurotoxicity of the dye used to visualize the internal limiting membrane (ILM), as well as unintentional removal of retinal neurofibers during ILM peeling, are responsible for such visual field disorders. In this report, we present a case of extensive visual field defect due to optic neuropathy exhibiting vertical hemianopsia after PPV. A 50-year-old woman underwent PPV and cataract surgery for a macular hole and mild cataract under retrobulbar anesthesia with 3.5 mL of xylocaine. At the time of opening an infusion cannula for PPV, the intraocular lens was herniating, with an acute increase in pressure from the posterior eyeball; thus, intraocular pressure configuration level had to be decreased from the default level, whereas the other procedures including 20% SF6 injection were performed without any modification. The macular hole was closed postoperatively. However, the patient experienced nasal hemianopsia, which turned out to be optic neuropathy, as assessed via electric physiological examinations. The pattern of the visual field defect was not typical for glaucoma or anterior ischemic optic neuropathy. Her optic nerve head was pale at the temporal side soon after the surgery, and her blood pressure was low, suggesting that there may have been a congestion of the optic nerve feeder vessels because of the relatively high pressure in the orbit. The space occupancy with xylocaine and extensively stretched and plumped out eye ball with infusion during PPV may have pressed the surrounding tissue of the optic nerve and the feeder vessels. PPV is safe

  10. ANÁLISE DINÂMICA NÃO LINEAR GEOMÉTRICA DE TRELIÇAS PLANAS

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    Leandro Damas Oliveira

    2017-04-01

    Full Text Available RESUMO: Este trabalho trata da análise dinâmica de treliças no plano, onde estudam-se os efeitos da não-linearidade geométrica nessas estruturas quando solicitadas por carregamentos dinâmicos. Nesse contexto, define-se a formulação baseada na análise não-linear geométrica que descreve o comportamento de treliças discretizadas por elementos finitos, utilizando-se o método corrotacional. Para a resolução dos sistemas não-lineares, utiliza-se o método numérico de Newton-Raphson e para a integração temporal dessas equações, utiliza-se o método de Newmark. Por meio dos eixos corrotacionais é possível separar os movimentos de corpo rígido dos movimentos deformacionais. Para verificar a eficácia da formulação estudada no presente trabalho, foram realizados exemplos com treliças planas usualmente empregadas em análises com grandes não-linearidades geométricas na literatura técnica. De forma geral, a formulação estudada apresentada se demostrou eficiente para a análise dinâmica de treliças com grandes não-linearidades geométricas. ABSTRACT: This paper deals with dynamic analysis of two dimensional trusses, where the effects of geometric nonlinearity in these structures is studied when subjected by dynamic loads. In this context, the formulation based on geometric nonlinear analysis that describes the behavior of trusses discretized by finite elements using the Corotational Method is developed. For solving nonlinear systems is used the Numerical Method of Newton-Raphson and for the time integration of these equations is used Newmark Method. Through the corotational axis is possible to separate the rigid body movements from deformational movements. To verify the accuracy of the formulation studied in the present work, examples with plane trusses usually employed in analyzes with large geometric non-linearities in the technical literature were made. In general, the studied formulation presented was efficient for the

  11. Diseño de un colector solar de placa plana; Design of a solar fl at plate collector

    Directory of Open Access Journals (Sweden)

    Jeovany Rafael Rodríguez Mejía

    2016-02-01

    Full Text Available En el presente artículo se integra el uso de un software de dis eño mecánico y un algoritmo de simulación de la operación de un colector solar de placa plana, con el objeti vo de simplificar el proceso de diseño y manufactura de este último. Se exponen los resultados de la sim ulación de la operación del colector solar considerando diferentes combinaciones en los parámetros de los materiales utilizados, tales como sus propiedades y características físico químicas, además de la var iación de las dimensiones del sistema a diseñar. Finalmente en el artículo se evalúa la operación de un colector solar para las condiciones climatológicas típicas de la irradiancia, velocidad de viento y temperatura ambiente a partir de una serie de curvas sinusoidales, típicas de Cuba, validándose la viabilidad del algoritmo como apoyo en la etapa de diseño y selección de materiales. In this article the use of mechanical design software and an al gorithm for simulating the operation of a flat plate solar collector, with the objective of simplifying the pr ocess of design and manufacture of the latter is integrated. The simulation results of the operation of the sola r collector considering different combinations in the parameters of the materials used, such as its physicochemic al properties and features in addition to the variation of the dimensions of the system design are set. The a rticle finally evaluates the operation of a solar collector for typical climatic conditions of irradiance, wind s peed and ambient temperature from a series of sinusoidal, typical Cuba curves is evaluated, validating the fe asibility of the algorithm as support in step design and material selection.

  12. [Cost recovery for the treatment of retinal and vitreal diseases by pars plana vitrectomy under the German DRG system].

    Science.gov (United States)

    Framme, C; Franz, D; Mrosek, S; Helbig, H

    2007-10-01

    Since 2004 inpatient health care in Germany is paid according to calculated DRGs. Only a few university hospitals participated in distinct cost calculations of clinical treatment. It was the aim of this study to check the cost recovery at a University Eye Hospital for the surgical treatment of retinal and vitreal diseases by pars plana vitrectomy (ppV), which are included in DRGs C03Z and C17Z. The performance data for both DRGs were collected for the years 2005 and 2006 using the E1 sheets according to section 21 KHEntG. The mean duration of all procedures was collected by data from the internal controlling. Costs for single operations were calculated from fixed and variable costs for the operation theatre and the ward including costs for personnel and material. In the 2-year period of 4,721 inpatient procedures 1,307 ppVs were performed. Each ppV had fixed surgical costs of 130.60 EUR; personnel costs varied between 575 EUR (C03Z; including cataract surgery; mean OP duration: 85 min) and 510 EUR (C17Z; no cataract surgery; mean OP duration: 73 min) at a proportion between general anaesthesia and local anaesthesia of 80/20. For a pure ppV material costs were 255 EUR. Additional adjuncts such as an encircling band, perfluorcarbon, ICG, tPA, gas and silicon oil or cataract surgery led to extra costs between 51 EUR and 250 EUR per adjunct und were used in 56% (C03Z) and 74.5% (C17Z) of all procedures. Costs for hospitalisation were about 1765 EUR at a mean residence time of 6.5 days. Thus, the overall costs of a pure basic ppV amounted to 2975 EUR (C03Z) and 2661 EUR (C17Z). In consideration of the current relative DRG weights of 1.08 and 0.957 and a current base rate of 2787.19 EUR in Bavaria, cost recovery is only given for basic ppV but not for complex ppVs having higher material and personnel costs. Additionally, the costs for multiple surgeries as occur in 5.9% of cases are not compensated by the DRG system. The reimbursement for inpatient ppVs in a University

  13. Outcomes of 23-gauge pars plana vitrectomy and internal limiting membrane peeling with brilliant blue in macular hole

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    Nohutcu A

    2011-08-01

    Full Text Available Huseyin Sanisoglu1, Mehmet Sahin Sevim1, Betul Aktas1, Semra Sevim2, Ahmet Nohutcu11Haydarpasa Numune Education and Research Hospital, Department of Ophthalmology, 2Uskudar State Hospital, Eye Clinic, Istanbul, TurkeyPurpose: The evaluation of anatomic and visual outcomes in macular hole cases treated with internal limiting membrane (ILM peeling, brilliant blue (BB, and 23-gauge pars plana vitrectomy (PPV.Materials and methods: Fifty eyes of 48 patients who presented between July 2007 and December 2009 with the diagnosis of stage 2, 3, or 4 macular holes according to Gass Classification who had undergone PPV and ILM peeling were included in this study. Pre- and postoperative macular examinations were assessed with spectral-domain optical coherence tomography. 23 G sutureless PPV and ILM peeling with BB was performed on all patients.Results: The mean age of patients was 63.34 ± 9.6 years. Stage 2 macular hole was determined in 17 eyes (34%, stage 3 in 24 eyes (48%, and stage 4 in 9 eyes (18%. The mean follow-up time was 13.6 ± 1.09 months. Anatomic closure was detected in 46/50 eyes (92%, whereas, in four cases, macular hole persisted and a second operation was not required due to subretinal fluid drainage. At follow-up after 2 months, persistant macular hole was detected in one case and it was closed with reoperation. At 12 months, an increase in visual acuity in 41 eyes was observed, while it remained at the same level in six eyes. In three eyes visual acuity decreased. There was a postoperative statistically significant increase in visual acuity in stage 2 and 3 cases (P < 0.05, however, no increase in visual acuity in stage 4 cases was observed.Conclusion: PPV and ILM peeling in stage 2, 3, and 4 macular hole cases provide successful anatomic outcomes, however, in delayed cases, due to photoreceptor loss, it has no effect on functional recovery. BB, used for clarity of ILM, may be beneficial due to its low retinal toxicity.Keywords: macular

  14. Long-term results of pars plana vitrectomy as an anti-inflammatory therapy of pediatric intermediate uveitis resistant to standard medical treatment.

    Science.gov (United States)

    Darsová, Denisa; Pochop, Pavel; Štěpánková, Jana; Dotřelová, Dagmar

    2018-01-01

    To evaluate the efficacy of pars plana vitrectomy (PPV) as an anti-inflammatory therapy in pediatric recurrent intermediate uveitis. A retrospective study evaluated the long-term results of PPV indicated for intermediate uveitis with a mean observation period of 10.3 years (range 7-15.6 years) in 6 children (mean age 8 years, range 6-12 years). Pars plana vitrectomy was performed on 10 eyes in the standard manner and was initiated by vitreous sampling for laboratory examination. Data recorded were perioperative or postoperative vitrectomy complications, anatomic and functional results of PPV, and preoperative and postoperative best-corrected Snellen visual acuity. No perioperative or postoperative complications were observed. Bacteriologic, virologic, mycotic, and cytologic analysis of the vitreous was negative in all tested children. Five eyes were subsequently operated on for posterior subcapsular cataracts. An average preoperative visual acuity of 0.32 improved to an average postoperative visual acuity of 0.8. In the case of systemic immunosuppressive treatment failure in pediatric uveitis, particularly in eyes with cystoid macular edema, we recommend PPV relatively early.

  15. Toxicity and the fractional distribution of trace metals accumulated from contaminated sediments by the clam Scrobicularia plana exposed in the laboratory and the field

    Energy Technology Data Exchange (ETDEWEB)

    Kalman, J., E-mail: judit.kalman@uca.es [Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD (United Kingdom); Bonnail-Miguel, E. [Department of Physical-Chemistry, University of Cadiz, Poligono Industrial Rio San Pedro s/n, 11,510 Puerto Real, Cadiz (Spain); Smith, B.D. [Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD (United Kingdom); Bury, N.R. [Division of Diabetes and Nutritional Science, King' s College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH (United Kingdom); Rainbow, P.S. [Department of Life Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD (United Kingdom)

    2015-02-15

    The relationship between the subcellular distribution of accumulated toxic metals into five operational fractions (subsequently combined into presumed detoxified and non-detoxified components) and toxicity in the clam Scrobicularia plana was investigated under different laboratory exposures. Clams were exposed to metal contaminated media (water and diet) and analysed for the partitioning of accumulated As, Cu and Zn into subcellular fractions. In general, metallothionein-like proteins, metal-rich granules and cellular debris in different proportions acted as main storage sites of accumulated metals in the clam soft tissues for these three metals. No significant differences were noted in the accumulation rates of As, Cu and Zn of groups of individuals with or without apparent signs of toxicity after up to 30 days of exposure to naturally contaminated sediment mixtures. There was, however, an increased proportional accumulation of Cu in the non-detoxified fraction with increased Cu accumulation rate in the clams, suggesting that the Cu uptake rate from contaminated sediments exceeded the combined rates of elimination and detoxification of Cu, with the subsequent likelihood for toxic effects in the clams. - Highlights: • Scrobicularia plana accumulated As, Cu and Zn from naturally toxic sediments. • Toxic metals were accumulated in detoxified and non-detoxified components. • Cu accumulation in the non-detoxified pool increased with increased Cu uptake rate. • Cu uptake rate exceeded combined loss and detoxification rates to cause toxicity.

  16. Combined pars plana lensectomy-vitrectomy with open-loop flexible anterior chamber intraocular lens (AC IOL) implantation for subluxated lenses.

    Science.gov (United States)

    Kazemi, S; Wirostko, W J; Sinha, S; Mieler, W F; Koenig, S B; Sheth, B P

    2000-01-01

    To review our experience with combined pars plana lensectomy-vitrectomy and open-loop flexible anterior chamber intraocular lens (AC IOL) implantation for managing subluxated crystalline lenses. Retrospective review of 36 consecutive eyes (28 patients), all of which had subluxated crystalline lenses, managed by pars plana lensectomy-vitrectomy with insertion of an open-loop flexible AC IOL. The study was performed at the Medical College of Wisconsin, Milwaukee, over an 8-year period. An average preoperative visual acuity of 20/163 (range, 20/25 to hand motions) improved to 20/36 (range, 20/20 to 4/200) with surgery after a mean follow-up of 14 months (range, 1 to 59 months) (P IOL implantation appears to be an excellent technique for managing subluxated crystalline lenses. It is associated with a significant improvement in visual acuity (P subluxated lens through a limbal wound. Additionally, use of an AC IOL offers a simplified alternative to placement of a ciliary sulcus sutured posterior chamber intraocular lens (PC IOL).

  17. Toxicity and the fractional distribution of trace metals accumulated from contaminated sediments by the clam Scrobicularia plana exposed in the laboratory and the field

    International Nuclear Information System (INIS)

    Kalman, J.; Bonnail-Miguel, E.; Smith, B.D.; Bury, N.R.; Rainbow, P.S.

    2015-01-01

    The relationship between the subcellular distribution of accumulated toxic metals into five operational fractions (subsequently combined into presumed detoxified and non-detoxified components) and toxicity in the clam Scrobicularia plana was investigated under different laboratory exposures. Clams were exposed to metal contaminated media (water and diet) and analysed for the partitioning of accumulated As, Cu and Zn into subcellular fractions. In general, metallothionein-like proteins, metal-rich granules and cellular debris in different proportions acted as main storage sites of accumulated metals in the clam soft tissues for these three metals. No significant differences were noted in the accumulation rates of As, Cu and Zn of groups of individuals with or without apparent signs of toxicity after up to 30 days of exposure to naturally contaminated sediment mixtures. There was, however, an increased proportional accumulation of Cu in the non-detoxified fraction with increased Cu accumulation rate in the clams, suggesting that the Cu uptake rate from contaminated sediments exceeded the combined rates of elimination and detoxification of Cu, with the subsequent likelihood for toxic effects in the clams. - Highlights: • Scrobicularia plana accumulated As, Cu and Zn from naturally toxic sediments. • Toxic metals were accumulated in detoxified and non-detoxified components. • Cu accumulation in the non-detoxified pool increased with increased Cu uptake rate. • Cu uptake rate exceeded combined loss and detoxification rates to cause toxicity

  18. Protocol for a feasibility cluster randomised controlled trial of a peer-led school-based intervention to increase the physical activity of adolescent girls (PLAN-A).

    Science.gov (United States)

    Sebire, Simon J; Edwards, Mark J; Campbell, Rona; Jago, Russell; Kipping, Ruth; Banfield, Kathryn; Tomkinson, Keeley; Garfield, Kirsty; Lyons, Ronan A; Simon, Joanne; Blair, Peter S; Hollingworth, William

    2016-01-01

    Physical activity levels are low amongst adolescent girls, and this population faces specific barriers to being active. Peer influences on health behaviours are important in adolescence and peer-led interventions might hold promise to change behaviour. This paper describes the protocol for a feasibility cluster randomised controlled trial of Peer-Led physical Activity iNtervention for Adolescent girls (PLAN-A), a peer-led intervention aimed at increasing adolescent girls' physical activity levels. A two-arm cluster randomised feasibility trial will be conducted in six secondary schools (intervention n  = 4; control n  = 2) with year 8 (12-13 years old) girls. The intervention will operate at a year group level and consist of year 8 girls nominating influential peers within their year group to become peer-supporters. Approximately 15 % of the cohort will receive 3 days of training about physical activity and interpersonal communication skills. Peer-supporters will then informally diffuse messages about physical activity amongst their friends for 10 weeks. Data will be collected at baseline (time 0 (T0)), immediately after the intervention (time 1 (T1)) and 12 months after baseline measures (time 2 (T2)). In this feasibility trial, the primary interest is in the recruitment of schools and participants (both year 8 girls and peer-supporters), delivery and receipt of the intervention, data provision rates and identifying the cost categories for future economic analysis. Physical activity will be assessed using 7-day accelerometry, with the likely primary outcome in a fully-powered trial being daily minutes of moderate-to-vigorous physical activity. Participants will also complete psychosocial questionnaires at each time point: assessing motivation, self-esteem and peer physical activity norms. Data analysis will be largely descriptive and focus on recruitment, attendance and data provision rates. The findings will inform the sample size required for a

  19. Utility of Pars Plana Vitrectomy with Internal Limiting Membrane Dissection, in the Surgical Treatment of Macular Hole and Diabetic Macular Edema. Clinic-Pathological Correlation

    OpenAIRE

    Castro de Sousa, João Paulo

    2006-01-01

    ObjetivosEstudiar el papel de la extracción de la membrana limitante interna (MLI) durante la vitrectomía posterior por vía pars plana (VPP), en el tratamiento quirúrgico de lo agujero macular (AM) y de lo edema macular crónico diabético (EMCD). Hemos estudiado las tasas de éxito clínico de la extracción de la MLI durante la VPP. Además hemos analizado el procedimiento técnico de extracción de la MLI, el aporte de la extracción de la MLI en la resolución clínica del EMCD después de la VPP y e...

  20. Algoritmo para generar formulas de características geométricas de las secciones planas, su implementación en DERIVE

    Directory of Open Access Journals (Sweden)

    Rolando Rivero-Galán

    2010-01-01

    Full Text Available En la esfera del diseño de estructuras y de elementos de maquinas, se presenta con relativa frecuencia el cálculo de determinadas características o propiedades geométricas de secciones planas, como son entre otras: el área de una sección transversal, el centro de gravedad, un momento de inercia o más general la determinación de alguna característica geométrica definida por una integral doble extendida en la región del plano que ocupa la sección, pieza o elemento.El presente trabajo tiene como objetivo la confección de un programa para computadora, utilizando el asistente matemático DERIVE, para la determinación de las características geométricas de secciones planas cuyo contorno este constituido por segmentos de rectas.In the sphere of the design of structures, is relative frequency the calculation of certain characteristic or geometric properties of plane sections, like: the area of a traverse section, the center of gravity, a moment of inertia or more general the determination of some geometric characteristic defined by a double integral extended in the region of the plane that occupies the section, piece or element.The present work has as objective the making of a program for computer, using the mathematical assistant DERIVE, for the determination of the geometric characteristics of plane sections whose contour this constituted by segments of right

  1. Intraocular Irrigating Solutions. A Clinical Study of BSS Plus ® and Dextrose Bicarbonate Fortified BSS ® as an Infusate during Pars Plana Vitrectomy.

    Directory of Open Access Journals (Sweden)

    Samuel Michael

    2003-01-01

    Full Text Available Purpose: To compare the effect of Balanced Salt Solution Plus (BSS Plus, Alcon Laboratories, Fort Worth, Texas, USA and fortified regular BSS on the cornea and lens, when used for continuous irrigation in pars plana vitrectomy (PPV surgery. Methods: Prospective, investigator masked, randomised study. Forty patients were randomly assigned to undergo PPV using BSS Plus (n=20 or fortified BSS (n=20 [regular BSS, fortified with 10.5 cc. of dextrose in water (D5W and 13.1cc. of 8.4% sodium bicarbonate]. Intraoperative features of the corneal epithelium, postoperative changes in the corneal endothelial cell denstiy (ECD at 3 months, and clarity of the lens during surgery and postoperatively were evaluated. Results: Intraoperative epithelial changes were similar in both groups with 7 (35% of the cases having the epithelium removed in the BSS Plus group and 8 (40% in the BSS fortified group (P=0.23. The mean differences in ECD (3 months versus preoperative in the operated eyes when adjusted for changes in the control eye showed no difference with the type of BSS (P=0.98. Intraoperative lens changes were more significant (P=0.018 in the BSS fortified group. Postoperative lens status at 3 months was similar for both groups. Though there was a trend towards worse postoperative nuclear sclerosis change in the BSS fortified group, it was not significant (P=0.160. Conclusion: Standard BSS fortified with dextrose and bicarbonate is an efficacious infusion fluid during pars plana vitrectomy. Both solutions showed comparable effects on postoperative corneal endothelial cell density and corneal epithelial changes intraoperatively. BSS fortified has more lenticular changes intraoperatively than BSS Plus although no lens had to be removed in either group. The study implications are important since BSS fortified is significantly less expensive than BSS Plus.

  2. Reseña de Coll-Planas (2012 La carne y la metáfora. Una reflexión sobre el cuerpo en la teoría queer

    Directory of Open Access Journals (Sweden)

    Rodrigo Prieto Drouillas

    2013-07-01

    Full Text Available El artículo presenta una reseña del libro «La carne y la metáfora», de Gerard  Coll-Planas (Editorial UOC, 2012, en el cual el autor expone sus críticas a la manera en que han sido interpretados en los últimos años los planteamientos de la teoría queer por algunos sectores de este movimiento en España, poniendo especial atención a la manera de entender el cuerpo y su relación con las identidades de sexo/género. Para ello, Coll-Planas explica las ideas principales de este marco teórico, así como las críticas más recurrentes que se le plantean. En su recorrido, utiliza diferentes técnicas narrativas que invitan al lector a sumergirse en Internet para conocer algunos casos concretos que ejemplifican la forma en que hoy nos relacionamos con el cuerpo, o de cómo éste es maltratado o vejado por culpa de la homofobia imperante. Como conclusión, Coll-Planas propone la politización de la dependencia, la vulnerabilidad y la muerte.

  3. Combined Cataract Extraction With Pars Plana Vitrectomy and Metallic Intraocular Foreign Body Removal Through Sclerocorneal Tunnel Using a Novel "Magnet Handshake" Technique.

    Science.gov (United States)

    Dhoble, Pankaja; Khodifad, Ashish

    2018-01-01

    To study the outcomes of combined cataract extraction with pars plana vitrectomy (PPV) and metallic intraocular foreign body (IOFB) removal through a sclerocorneal tunnel using the "magnetic handshake" technique. A retrospective review. Retrospective review of case records of 14 patients from 2010 to 2016 with metallic IOFB and traumatic cataract was performed. Cataract extraction was combined with PPV. Two intraocular magnets (IOMs) introduced through 20-gauge vitrectomy port and sclerocorneal tunnel helped achieve safe delivery of IOFB outside the globe by the "magnetic handshake" technique. All patients were males with a mean age of 33.04 years. A final best corrected visual acuity (BCVA) of 20/60 or better was noted in 10 (71.42%) of 14 patients. Final reattachment with more than 1 surgery was achieved in 13 (92.85%) patients. Postoperative complications included retinal detachment (RD) and phthisis bulbi in 1 (14.28%) patient each. Combined cataract extraction with PPV and metallic IOFB removal through sclerocorneal tunnel using the "magnet handshake" technique gives good visual and surgical outcomes. Copyright 2017 Asia-Pacific Academy of Ophthalmology.

  4. Análisis de estructuras planas canónicas mediante ordenadores de pequeña capacidad de memoria

    Directory of Open Access Journals (Sweden)

    Parras Galán, Luis

    1984-10-01

    Full Text Available In this study a method is developed which will enable canonical flat structures containing numerous elements to be analyzed, using computers with a small capacity of central memory and without the necessity of a peripheral memory. The field of application for these structures is in jointed beams (Warren, Pratt types, etc., roof frames, canopies, etc., which are those most widely used in the world of a rural and industrial engineering. Consider, for example, the different agricultural instalattions in which these structures are used, such as warehouses for storing machinery, the storage of agricultural products, industrial and cattle-raising installations, etc.En el presente trabajo se desarrolla un método que permite el análisis de estructuras planas canónicas de gran número de elementos, con ordenadores de pequeña capacidad de memoria central y sin requerimiento de memoria periférica. Dichas estructuras tienen su campo de aplicación en vigas articuladas (tipo Warren, Pratt, etc., cerchas, marquesinas, etc., que son las que con mayor profusión se utilizan en el mundo de la ingeniería rural e industrial. Piénsese, por ejemplo, en las distintas instalaciones agrícolas en las que se utilizan dichas estructuras como son las naves para el resguardo de maquinaria, almacenamiento de productos agrarios, instalaciones industriales, ganaderas, etc.

  5. Phacoaspiration with a Cionni ring versus pars plana lensectomy, vitrectomy and sutureless transscleral IOL fixation in pediatric patients with a subluxated lens.

    Science.gov (United States)

    Thapa, Bikram Bahadur; Agarwal, Aniruddha; Singh, Ramandeep; Gupta, Parul Chawla; Ram, Jagat

    2016-05-01

    To compare outcomes of phacoaspiration (PA) with Cionni ring-assisted posterior-chamber intraocular lens implantation (PCIOL) versus pars plana lensectomy (PPL) with anterior vitrectomy (AV) and sutureless transscleral fixation of the IOL (TSFIOL) assisted with fibrin glue in the management of a subluxated lens. In this prospective and comparative interventional study, one eye of children with a bilateral subluxated lens was randomized to undergo PA with PCIOL using a Cionni ring (group A: n = 14 eyes), and the other eye underwent PPL + AV with glue-assisted TSFIOL (group B: n = 14 eyes). The outcome measures included best-corrected visual acuity (BCVA) in logMAR units and rates of complications at 12-month follow-up visits. 28 eyes of 14 children (age: 8.06 ± 4.49 years) were included in the study. BCVA improved from preoperative value of 1.21 to 0.4 (p = 0.001) in group A and from 1.53 to 0.31 (p = 0.001) in group B at month 12. There was no significant difference in the BCVA on comparing the two groups at month 12 (p > 0.411). Postoperative complications in group A included corneal edema (two eyes), Cionni hook capture (one eye), elevated IOP (one eye), and posterior capsular opacification (five eyes). In group B, corneal edema was seen in two eyes, hypotony in one eye, vitreous hemorrhage in one eye and pupillary optic capture in four eyes. Head-to-head comparison of the two techniques demonstrates no significant difference in the rates of complications at month 12. The decision to choose either technique may be based on the operating surgeon's skill, experience and preference.

  6. Update to a protocol for a feasibility cluster randomised controlled trial of a peer-led school-based intervention to increase the physical activity of adolescent girls (PLAN-A).

    Science.gov (United States)

    Sebire, Simon J; Edwards, Mark J; Campbell, Rona; Jago, Russell; Kipping, Ruth; Banfield, Kathryn; Kadir, Bryar; Garfield, Kirsty; Lyons, Ronan A; Blair, Peter S; Hollingworth, William

    2016-01-01

    Physical activity levels are low amongst adolescent girls, and this population faces specific barriers to being active. Peer influences on health behaviours are important in adolescence, and peer-led interventions might hold promise to change behaviour. This paper describes the protocol for a feasibility cluster randomised controlled trial of Peer-Led physical Activity iNtervention for Adolescent girls (PLAN-A), a peer-led intervention aimed at increasing adolescent girls' physical activity levels. In addition, this paper describes an update that has been made to the protocol for the PLAN-A feasibility cluster randomised controlled trial. A two-arm cluster randomised feasibility trial will be conducted in six secondary schools (intervention n  = 4; control n  = 2) with year 8 (12-13 years old) girls. The intervention will operate at a year group level and consist of year 8 girls nominating influential peers within their year group to become peer supporters. Approximately 15% of the cohort will receive 3 days of training about physical activity and interpersonal communication skills. Peer supporters will then informally diffuse messages about physical activity amongst their friends for 10 weeks. Data will be collected at baseline (time 0 (T0)), immediately after the intervention (time 1 (T1)) and 12 months after baseline measures (time 2 (T2)). In this feasibility trial, the primary interest is in the recruitment of schools and participants (both year 8 girls and peer supporters), delivery and receipt of the intervention, data provision rates and identifying the cost categories for future economic analysis. Physical activity will be assessed using 7-day accelerometry, with the likely primary outcome in a fully powered trial being daily minutes of moderate-to-vigorous physical activity. Participants will also complete psychosocial questionnaires at each time point: assessing motivation, self-esteem and peer physical activity norms. Data analysis will be

  7. Fate of isotopically labeled zinc oxide nanoparticles in sediment and effects on two endobenthic species, the clam Scrobicularia plana and the ragworm Hediste diversicolor.

    Science.gov (United States)

    Buffet, Pierre-Emmanuel; Amiard-Triquet, Claude; Dybowska, Agnieszka; Risso-de Faverney, Christine; Guibbolini, Marielle; Valsami-Jones, Eugénia; Mouneyrac, Catherine

    2012-10-01

    Although it is reported that metal and metal oxide nanoparticles, which are among the most rapidly commercialized materials, can cause toxicity to organisms, their fate in the environment and toxicity to marine organisms are not well understood. In this study, we used a stable isotope labelling approach to trace the fate of nanoparticles (NPs) in sediments and also investigated bio-uptake in two estuarine intra-sedimentary invertebrates Scrobicularia plana and Nereis diversicolor. We selected exposure to 3 mg kg(-1) sediment ZnO NPs since this level is a realistic prediction of the environmental concentration in sediments. 67ZnO NPs (DLS: 21-34 nm, positively charged: 31.3 mV) suspensions were synthesised in diethylene glycol (DEG). We explored the fate of 67ZnO NPs in sediment, 67Zn bioaccumulation and the biochemical (biomarkers of defence and damage) and behavioural (burrowing kinetics and feeding rates) biomarkers in both species to 67ZnO NPs and DEG on its own during a 16 d laboratory exposure. After exposure, 67Zn concentrations in sediment showed higher levels in the upper section (1cm: 2.59 mg kg(-1)) decreasing progressively (2 cm: 1.63 mg kg(-1), 3 cm: 0.90 mg kg(-1), 4 cm: 0.67 mg kg(-1)) to a minimum value at the bottom (5 cm: 0.31 mg kg(-1)). 67Zn bioaccumulation was observed in both organisms exposed to 67ZnO NPs in DEG but no major inter-species differences were found. At the biochemical level, 67ZnO NPs exposure significantly induced increased glutathione-S-transferase activity in worms and catalase activity in clams whereas superoxide dismutase activity and thiobarbituric acid reactive substance levels were not affected in any species. Exposure to DEG on its own leads to a significant increase of metallothionein-like protein levels in clams compared with those exposed to 67ZnO NPs or controls. Burrowing behaviour as well as feeding rate were significantly impaired in both species exposed to 67ZnO NPs. Concerning exposure to DEG on its own

  8. [Verruca planae Chinese medicine treatment].

    Science.gov (United States)

    Chen, Hai-Ming

    2008-08-01

    Flat wart on the effectiveness of TCM treatment. Outpatients will be by the "People's Republic of China Chinese medicine industry standards, TCM diagnosis of dermatological diseases efficacy standards, Chen Hou State Administration of Traditional Chinese Medicine 1994-06-28 approved, 1995-01-01 implementation". Randomly divided into two groups. Treatment and control groups. Treatment groups treated with Chinese herbs. The control group were treated with WM. Since the preparation of the unification formula ointment, cuboiling method. Chinese herbal medicine preparation by my hospital room Producer. 5 g pre pack, after treatment for 30 days, clinical observation. The group of Chinese medicine is better than western medicine (86.7% vs 71.7% , P < 0.05). Chinese medicine has some effect flat wart.

  9. Review of Balltondre (2012 Éxtasis y visiones. La experiencia contemplativa de Teresa de Ávila Reseña de Coll-Planas (2012 La carne y la metáfora. Una reflexión sobre el cuerpo en la teoría queer

    Directory of Open Access Journals (Sweden)

    Rodrigo Prieto Drouillas

    2013-07-01

    Full Text Available El artículo presenta una reseña del libro «La carne y la metáfora», de Gerard  Coll-Planas (Editorial UOC, 2012, en el cual el autor expone sus críticas a la manera en que han sido interpretados en los últimos años los planteamientos de la teoría queer por algunos sectores de este movimiento en España, poniendo especial atención a la manera de entender el cuerpo y su relación con las identidades de sexo/género. Para ello, Coll-Planas explica las ideas principales de este marco teórico, así como las críticas más recurrentes que se le plantean. En su recorrido, utiliza diferentes técnicas narrativas que invitan al lector a sumergirse en Internet para conocer algunos casos concretos que ejemplifican la forma en que hoy nos relacionamos con el cuerpo, o de cómo éste es maltratado o vejado por culpa de la homofobia imperante. Como conclusión, Coll-Planas propone la politización de la dependencia, la vulnerabilidad y la muerte.

  10. Screening Some Tef [Eragrostis Tef (Zucc.)Trotter] Accessions ...

    African Journals Online (AJOL)

    ABSTRACT. Salinity is a continuing problem in the arid and semi-arid tracts of the world. It could be alleviated using irrigation management and/or crop management. However, the former approach is outdated and very expensive. Nevertheless, the latter is economical as well as efficient, and it enables to produce salt ...

  11. Response of Yield and Yield Components of Tef [Eragrostis Tef ...

    African Journals Online (AJOL)

    The partial budget analysis also indicates that applications of 46 kg. N ha-1 and 10 kg P ha-1 are ..... (1994) indicated that where the grain yield response is negative, yield reduction is primarily caused by a .... An Economic Training. Manual.

  12. Probiotic potential and nutritional importance of teff (Eragrostis tef ...

    African Journals Online (AJOL)

    African Journal of Food, Agriculture, Nutrition and Development. Journal Home · ABOUT THIS JOURNAL · Advanced Search · Current Issue · Archives · Journal Home > Vol 15, No 2 (2015) >. Log in or Register to get access to full text downloads.

  13. Physiological response of selected eragrostis species to water ...

    African Journals Online (AJOL)

    Administrator

    2011-09-07

    Sep 7, 2011 ... Department of Molecular and Cell Biology, University of Cape Town, Private Bag, .... respiration measurements were taken at night (20:00 h). .... Cellular ultrastructure .... these in place, to be held at intermediate water contents.

  14. Effect of supplementing or treating Eragrostis curvula hay with urea ...

    African Journals Online (AJOL)

    ismail - [2010

    2017-02-06

    Feb 6, 2017 ... sealed with a rubber stopper and crimp seal cap. For each incubation run, ..... Science and Technology and National Research Foundation, South Africa. The corresponding ... USDA Agricultural Handbook No. 379. pp. 1-20.

  15. Irreversibility analysis of non isothermal flat plate solar collectors for air heating with a dimensionless model; Analisis de las irreversibilidades en colectores solares de placas planas no isotermicos para calentamiento de aire utilizando un modelo adimensional

    Energy Technology Data Exchange (ETDEWEB)

    Bracamonte-Baran, Johane Hans; Baritto-Loreto, Miguel Leonardo [Universidad Central de Venezuela (Venezuela)]. E-mails: johanehb@gmail.com; johane.bracamonte@ucv.ve; miguel.baritto@ucv.ve

    2013-04-15

    The dimensionless model developed and validated by Baritto and Bracamonte (2012) for the thermal behavior of flat plate solar collector without glass cover is improved by adding the entropy balance equation in a dimensionless form. The model is solved for a wide range of aspect ratios and mass flow numbers. A parametric study is developed and the distribution of internal irreversibilities along the collector is analyzed. The influence of the design parameters on the entropy generation by fluid friction and heat transfer is analyzed and it is found that for certain combinations of these parameters optimal thermodynamic operation can be achieved. [Spanish] En el presente trabajo, el modelo adimensional desarrollado y validado por Baritto y Bracamonte (2012) para describir el comportamiento termico de colectores solares de placas planas sin cubierta transparente, se complementa con la ecuacion adimensional de balance de entropia para un elemento diferencial de colector solar. El modelo se resuelve para un amplio rango de valores de relaciones de aspecto y numero de flujo de masa. A partir de los resultados del modelo se desarrolla un analisis detallado de la influencia de estos parametros sobre la distribucion de irreversibilidades internas a lo largo del colector. Adicionalmente se estudia la influencia de estos parametros sobre los numeros de generacion de entropia por friccion viscosa, por transferencia de calor y total. Se encuentra que existen combinaciones de los parametros antes mencionados, para los cuales, la operacion del colector es termodinamicamente optima para numeros de flujo de masa elevados.

  16. Small-Gauge Pars Plana Vitrectomy for the Management of Symptomatic Posterior Vitreous Detachment after Phacoemulsification and Multifocal Intraocular Lens Implantation: A Pilot Study from the Pan-American Collaborative Retina Study Group

    Science.gov (United States)

    Navarro, Rodrigo M.; Machado, Leonardo M.; Maia, Ossires; Wu, Lihteh; Farah, Michel E.; Magalhaes, Octaviano; Arevalo, J. Fernando; Maia, Mauricio

    2015-01-01

    Purpose. To determine the efficacy of 23-gauge pars plana vitrectomy (PPV) for symptomatic posterior vitreous detachment (PVD) on visual acuity (VA) and quality after multifocal intraocular lenses (IOLs). Methods. In this prospective case series, patients who developed symptomatic PVD and were not satisfied with visual quality due to floaters and halos after multifocal IOL implantation underwent PPV. Examinations included LogMAR uncorrected visual acuity (UCVA), intraocular pressure, biomicroscopy, and indirect ophthalmoscopy at baseline and 1, 7, 30, and 180 days postoperatively. Ultrasonography and aberrometry were performed. The Visual Functioning Questionnaire 25 (VFQ-25) was administered preoperatively and at 30 days postoperatively. Both the postoperative UCVA and questionnaire results were compared to preoperative findings using the Wilcoxon test. Results. Sixteen eyes of 8 patients were included. VA significantly improved from 0.17 to 0.09 postoperatively (P = 0.017). All patients reported improvement of halos, glare, and floaters. VFQ-25 scores significantly improved in general vision (P = 0.023), near activities (P = 0.043), distance activities (P = 0.041), mental health (P = 0.011), role difficulties (P = 0.042), and driving (P = 0.016). Conclusion. PPV may increase UCVA and quality of vision in patients with bilateral multifocal IOLs and symptomatic PVD. Larger studies are advised. PMID:26504590

  17. Pars plana vitrectomy with juxtapapillary laser photocoagulation versus vitrectomy without juxtapapillary laser photocoagulation for the treatment of optic disc pit maculopathy: the results of the KKESH International Collaborative Retina Study Group.

    Science.gov (United States)

    Abouammoh, Marwan A; Alsulaiman, Sulaiman M; Gupta, Vishali S; Mousa, Ahmed; Hirakata, Akito; Berrocal, Maria H; Chenworth, Megan; Chhablani, Jay; Oshima, Yusuke; AlZamil, Waseem M; Casella, Antonio Marcelo; Papa-Oliva, Gabriela; Banker, Alay S; Arevalo, J Fernando

    2016-04-01

    To compare the functional and anatomic outcomes of pars plana vitrectomy (PPV) with juxtapapillary laser photocoagulation (JLP) versus vitrectomy without JLP in optic disc pit maculopathy. This was a multicentre, retrospective study of 46 consecutive patients with optic disc pit maculopathy presenting at tertiary eye centres between 1992 and 2012. Indications for surgery included distorted or decreased vision. Surgical intervention included PPV, posterior vitreous detachment, with or without gas tamponade. Twenty-four patients received laser photocoagulation at the temporal edge of the optic disc pit (group A) and 22 patients had no laser (group B). Postoperative best-corrected visual acuity (BCVA) and optical coherence tomography findings were the main outcome measures. Mean follow-up was 44 months (range 12-98 months). BCVA in group A improved significantly from 0.7 logMAR (20/100) preoperatively to 0.5 logMAR (20/60) postoperatively (p=0.017). In group B, BCVA improved from 0.7 logMAR (20/100) preoperatively to 0.4 logMAR (20/40) postoperatively (p=0.014). The difference in final BCVA between groups was not statistically significant (p=0.693). The mean central macular thickness (CMT) in group A improved significantly from 750 μm preoperatively to 309 μm at last follow-up (pfinal CMT between groups was not statistically significant (p=0.747). PPV with JLP for optic disc pit maculopathy had similar functional and anatomic outcomes compared with vitrectomy without JLP. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

  18. Two-Port Pars Plana Anterior and Central Core Vitrectomy (Lam Floaterectomy) in Combination With Phacoemulsification and Intraocular Lens Implantation Under Topical Anesthesia for Patients with Cataract and Significant Floaters: Results of the First 50 Consecutive Cases.

    Science.gov (United States)

    Lam, Dennis S C; Leung, Hiu Ying; Liu, Shu; Radke, Nishant; Yuan, Ye; Lee, Vincent Y W

    2017-01-01

    To study the safety and efficacy of 2-port pars plana anterior and central core vitrectomy (Lam floaterectomy) in combination with phacoemulsification (phaco) and intraocular lens implantation (IOL) for patients with cataract and significant floaters under topical anesthesia. Retrospective review of the first 50 consecutive cases. A standardized treatment protocol was used for patients with cataract and significant (moderate to severe) floaters (duration > 3 months). Data analysis included intraoperative and postoperative complications, floater status, and patient satisfaction. There were 50 eyes (38 patients) with a male-to-female ratio of 1 to 2.3. Twelve patients had bilateral eye surgeries. Mean age was 58.10 ± 9.85 years (range, 39-83). All patients completed the 3-month follow-up. One eye had mild vitreous hemorrhage at the end of surgery arising from sclerotomy wound oozing. No other intraoperative compli-cations were encountered. Postoperatively, there was 1 case of transient hypotony and 1 case of congestion at sclerotomy wound. No cases of retinal break or detachment, or clinically significant macular edema, were reported. There were 5 cases (10%) of mild residual floaters and 1 case (2%) of floater recurrence. Total floater clearance rate was 88%. Patient satisfaction rates were 80%, 14%, 6%, and 0% for very satisfied, satis-fied, acceptable, and unsatisfied, respectively. The 3-month results in terms of safety and efficacy of the Lam floaterectomy in combination with phaco and IOLfor patients with cataract and significant floaters under topical anesthesia are encouraging. Further larger-scale, prospective, multicenter studies seem warranted. Copyright© 2017 Asia-Pacific Academy of Ophthalmology.

  19. Integrated assessment of future potential global change scenarios and their hydrological impacts in coastal aquifers – a new tool to analyse management alternatives in the Plana Oropesa-Torreblanca aquifer

    Directory of Open Access Journals (Sweden)

    D. Pulido-Velazquez

    2018-05-01

    Full Text Available Any change in the components of the water balance in a coastal aquifer, whether natural or anthropogenic, can alter the freshwater–salt water equilibrium. In this sense climate change (CC and land use and land cover (LULC change might significantly influence the availability of groundwater resources in the future. These coastal systems demand an integrated analysis of quantity and quality issues to obtain an appropriate assessment of hydrological impacts using density-dependent flow solutions. The aim of this work is to perform an integrated analysis of future potential global change (GC scenarios and their hydrological impacts in a coastal aquifer, the Plana Oropesa-Torreblanca aquifer. It is a Mediterranean aquifer that extends over 75 km2 in which important historical LULC changes have been produced and are planned for the future. Future CC scenarios will be defined by using an equi-feasible and non-feasible ensemble of projections based on the results of a multi-criteria analysis of the series generated from several regional climatic models with different downscaling approaches. The hydrological impacts of these CC scenarios combined with future LULC scenarios will be assessed with a chain of models defined by a sequential coupling of rainfall-recharge models, crop irrigation requirements and irrigation return models (for the aquifer and its neighbours that feed it, and a density-dependent aquifer approach. This chain of models, calibrated using the available historical data, allow testing of the conceptual approximation of the aquifer behaviour. They are also fed with series representatives of potential global change scenarios in order to perform a sensitivity analysis regarding future scenarios of rainfall recharge, lateral flows coming from the hydraulically connected neighbouring aquifer, agricultural recharge (taking into account expected future LULC changes and sea level rise (SLR. The proposed analysis is valuable for

  20. Análisis energético de un sistema fotovoltaico integrado a una cubierta plana horizontal; Energetic analysis of a photovoltaic system integrated to a horizontal flatrooftop

    Directory of Open Access Journals (Sweden)

    Liomnis Osorio Laurencio

    2015-12-01

    Full Text Available En el presente trabajo se analiza el desempeño energético de un sistema fotovoltaico a base de silicio amorfo, integrado a la cubierta plana horizontal del Edificio Docente #2 del Instituto Superior Minero Metalúrgico de Moa.Con el software PV syst se determinó la producción anual de energía eléctrica del sistema de 3 kWp conectado a la red, así como las pérdidas por sombras, cableado, electrónica de potencia, modificación del ángulo deinclinación y por efecto de la irradiancia y temperatura. También se calcularon los parámetros característicos de la instalación, útiles para establecer perfiles mensuales para la planificación del consumo eléctrico. Los resultados demostraron que la energía anual generada, es equivalente al consumo eléctrico del Instituto durante dos días y además, constituye una alternativa para la generación de energía, a partir del aprovechamiento de espacios disponibles en azoteas de las áreas docentes y administrativas.In this research the energy performance of a photovoltaic system based on amorphous silicon is analyzed. It is integrated to the flat horizontal rooftop of Teaching Building # 2 of the Metallurgical Mining Institute of Moa. Withthe PVsyst software annual electricity production of 3 kWp system connected to grid, as well as losses shadows, wiring, power electronics, also, tilt angle and the effect of irradiance and temperature were determined. Thecharacteristic parameters of the installation, useful were calculated to establish monthly planning profiles for electrical consumption. The results showed that the annual energy generated is equivalent to the electricityconsumption of the Institute for two days and also an alternative for generation energy from the use of space available on rooftops of teaching and administrative areas.

  1. Influence of stiffness in bolted connections in wooden plane structure of truss type Influência da rigidez de ligações parafusadas em estruturas planas de madeira do tipo treliça

    Directory of Open Access Journals (Sweden)

    André L. Christoforo

    2011-10-01

    Full Text Available Trusses are structural systems commonly used in projects, being employed mainly in roof structures, present in most rural buildings. The design of trusses, as well as other structural systems, requires the determination of displacements, strains and stresses. However, the project is developed from an ideal model of calculation, considering free rotation between the elements of a connection. This paper presents a computer program for the analysis of bidimensional wooden trusses with connections formed with two screws per node. The formulation is based on the flexibility method, taking into account the influence of the effect of semi-rigid connections formed by two screws. An example of a structure is presented and analyzed by the program developed here, highlighting the importance of behavior analysis on semi-rigid connections.Treliças são sistemas estruturais comumente utilizados em projetos, empregadas principalmente em estruturas de cobertura, presentes na maioria das construções rurais. O dimensionamento de treliças, assim como o de outros sistemas estruturais, requer a determinação dos deslocamentos, esforços, tensões e deformações atuantes em seus elementos constituintes. O cálculo é desenvolvido com base em um modelo ideal, considerando-se o giro livre entre os elementos componentes de uma ligação. Este trabalho objetiva apresentar um programa computacional destinado à análise de treliças planas de madeira com ligações formadas com dois parafusos por nó. A formulação é fundamentada no Método da Flexibilidade, levando-se em consideração a influência do efeito semirrígido das ligações formadas por dois parafusos. Um exemplo de estrutura auxiliar de cobertura é apresentado e analisado pelo programa desenvolvido, evidenciando-se a importância da análise do comportamento semirrígido sobre as ligações.

  2. Algoritmo para generar formulas de características geométricas de las secciones planas, su implementación en DERIVE // Algorithm for the calculation of the geometric characteristics of the plane sections defined for polygonal, their implementation in DERI

    Directory of Open Access Journals (Sweden)

    Rolando Rivero-Galán

    2010-01-01

    Full Text Available ResumenEn la esfera del diseno de estructuras y de elementos de maquinas, se presenta con relativafrecuencia el calculo de determinadas caracteristicas o propiedades geometricas de seccionesplanas, como son entre otras: el area de una seccion transversal, el centro de gravedad, unmomento de inercia o mas general la determinacion de alguna caracteristica geometrica definidapor una integral doble extendida en la region del plano que ocupa la seccion, pieza o elemento.El presente trabajo tiene como objetivo la confeccion de un programa para computadora,utilizando el asistente matematico DERIVE, para la determinacion de las caracteristicas geometricasde secciones planas cuyo contorno este constituido por segmentos de rectas.Palabras claves: Algoritmo, seccion plana, DERIVE, momentos, centro de gravedad.______________________________________________________________AbstractIn the sphere of the design of structures, is relative frequency the calculation of certaincharacteristic or geometric properties of plane sections, like: the area of a traverse section, thecenter of gravity, a moment of inertia or more general the determination of some geometriccharacteristic defined by a double integral extended in the region of the plane that occupies thesection, piece or element.The present work has as objective the making of a program for computer, using the mathematicalassistant DERIVE, for the determination of the geometric characteristics of plane sections whosecontour this constituted by segments of right.Key words: Algorithm, plane section, DERIVE, moments, center of gravity

  3. A case of verru plana on tattoo.

    Science.gov (United States)

    Karadag, Ayse Serap; Bilgili, Serap Gunes; Onder, Sevda; Kosem, Mustafa

    2014-07-01

    Tattoo is a popular cosmetic decoration, however several different tattoo-induced complication have been described. Several tattoo related cutaneous reactions such as allergic, granulomatous, lichenoid reactions, and infections have been reported. A 20 year-old male presented with multiple papules on the dragon shaped tattoo. The clinical and histopathological assessments were consistent with verrucas. Tattoo has become increasingly popular among young people. People interested in tattoos should be informed on its related infections and complications during and following tattooing. Herein, we present this rare tattoo induced verru plane to point out tattoo related complications and its treatments.

  4. Disorders Incidence and Analysis of a Flat Stabilization Splint as Its Therapy Levantamento de Incidência de DTMS e Análise da Efetividade da Placa de Mordida Plana Como Terapia TMJ

    Directory of Open Access Journals (Sweden)

    João Ricardo T. Milam

    2004-10-01

    ético utilizou-se do Critério de Classificação e Diagnóstico para Cefaléias, Neuralgias Cranianas e Dor Facial da Sociedade Internacional de Dores de Cabeça / IHS, associado ao Critério Diagnóstico para Pesquisa em DTMs. Os sinais e sintomas diagnosticados em ambos os Grupos, fundamentados nos dois critérios acima especificados, foram: dor nas ATMs e na musculatura que auxilia a mastigação, limitação de movimentos de abertura e fechamento da boca, dores faciais, bruxismo, dor relacionada a problemas de oclusão dentária, estalido ao abrir a boca, cansaço mandibular, efeito de apertamento dos dentes . Ainda, e somente no Grupo I, foi analisada a efetividade da placa de mordida plana como terapia aplicada a esses casos, sendo que esta se demonstrou eficaz em todos os tratamentos realizados.  

  5. FORMAÇÃO CONTINUADA DO PROFESSOR DOS ANOS INICIAIS: REVISITANDO FIGURAS PLANAS COM SOFTWARE DE GEOMETRIA DINÂMICA. CONTINUING EDUCATION FOR TEACHERS OF THE EARLY YEARS: REVISITING PLANE FIGURES WITH DYNAMIC GEOMETRY SOFTWARE

    Directory of Open Access Journals (Sweden)

    Poloni, Marinês Yole

    2012-05-01

    Full Text Available Este artigo tem por propósito discutir episódios da prática de duas professoras do Ensino Fundamental I que em um curso de formação continuada revisitaram alguns conceitos geométricos. O foco está na reconstrução dos conceitos dessas professoras, entretanto são explicitadas também decisões e estratégias metodológicas por elas tomadas a fim de mediar a aprendizagem dos alunos. A pesquisa de mestrado, que subsidia este texto, foi realizada ao longo do curso “Geometria em Ação”, o qual estava centrado no tema Figuras Planas e, nele, foi utilizado o software Cabri-Géomètre[1]. A fundamentação teórica foi construída a partir dos conceitos de reflexão de Schön, das vertentes do conhecimento didático de Ponte & Oliveira e da articulação entre teoria e prática de Tardif. A pesquisa de caráter qualitativo utilizou a metodologia de Design-Based Research. No artigo apresentamos reflexões tanto sobre a (reconstrução de conceitos geométricos, quanto sobre a prática docente. Concluímos, ao final do estudo, que ocorreram situações de reconstrução de conceitos geométricos por parte de ambas as professoras, particularmente quanto às definições e às propriedades de triângulos e quadriláteros. Em relação à prática docente, elas se conscientizaram das decisões tomadas tanto durante o planejamento de suas aulas quanto durante a aplicação das mesmas avaliando, posteriormente, suas decisões didáticas e pedagógicas. This paper discusses episodes of teaching practices of two primary school teachers whom, during a course of continuing education, have revisited some geometrical concepts. The focus is on the reconstruction of mathematical concepts of these teachers, however, we also present methodological strategies and decisions taken by them in order to support students' learning. The underlying research was carried out along the course "Geometria em Ação" (Geometry in Action, which was centered on the Planar

  6. Propuesta de enseñanza de equilibrio de cuerpo rígido por la acción de fuerzas coplanares con el uso de la geometría plana en el curso de Estática, de la Institución universitaria Pascual Bravo

    OpenAIRE

    Giraldo García, Jorge Iván

    2014-01-01

    Resumen: La propuesta de enseñanza del equilibrio de cuerpo rígido con el uso de la geometría plana para la asignatura Estática que se dicta en la Institución universitaria Pascual Bravo de Medellín, está enfocada en las teorías de aprendizaje significativo. Pretende con la ayuda de la geometría mejorar la comprensión de los conceptos que se deben aprender en la asignatura, como alternativa al uso matemático, como usualmente la enseñan los libros guía. El método descansa en los seis princ...

  7. Aplicações do estudo do cálculo integral no nível básico de ensino associado à resolução do cálculo de áreas de figuras planas

    OpenAIRE

    Dias, Marco Antônio Alves

    2015-01-01

    Apresentamos neste trabalho uma pequena reflexão do que é o Cálculo Diferencial e Integral. Partimos da ideia inicial de áreas de figuras planas elementares e incrementamos nossa discussão com o cálculo aproximado da área do círculo. Através da construção de várias ferramentas matemáticas, demonstramos resultados já esperados e apresentamos o cálculo de áreas de figuras básicas com outro enfoque, além de discutirmos a obtenção de áreas para regiões que não são triviais para um aluno do Ensino...

  8. Diet Switching by Mammalian Herbivores in Response to Exotic Grass Invasion.

    Directory of Open Access Journals (Sweden)

    Carolina Bremm

    Full Text Available Invasion by exotic grasses is a severe threat to the integrity of grassland ecosystems all over the world. Because grasslands are typically grazed by livestock and wildlife, the invasion is a community process modulated by herbivory. We hypothesized that the invasion of native South American grasslands by Eragrostis plana Nees, an exotic tussock-forming grass from Africa, could be deterred by grazing if grazers switched dietary preferences and included the invasive grass as a large proportion of their diets. Bos taurus (heifers and Ovis aries (ewes grazed plots with varying degrees of invasion by E. plana in a replicated manipulative experiment. Animal positions and species grazed were observed every minute in 45-min grazing session. Proportion of bites and steps in and out of E. plana tussocks were measured and used to calculate several indices of selectivity. Both heifers and ewes exhibited increasing probability of grazing E. plana as the proportion of area covered by tussocks increased, but they behaved differently. In agreement with expectations based on the allometry of dietary preferences and morphology, ewes consumed a low proportion of E. plana, except in areas that had more than 90% E. plana cover. Heifers consumed proportionally more E. plana than ewes. Contrary to our hypothesis, herbivores did not exhibit dietary switching towards the invasive grass. Moreover, they exhibited avoidance of the invasive grass and preference for short-statured native species, both of which should tend to enhance invasion. Unless invasive plants are highly palatable to livestock, the effect of grazing to deter the invasion is limited, due to the inherent avoidance of the invasive grass by the main grazers in the ecosystem, particularly sheep.

  9. Interrelationship and path coefficient analysis of yield components in F4 progenies of tef (Eragrostis tef).

    Science.gov (United States)

    Debebe, Abel; Singh, Harijat; Tefera, Hailu

    2014-01-01

    This experiment was conducted at Debre Zeit and Akaki during 2004-2005 cropping season on F2-derived F4 bulk families of three crosses, viz, DZ-01-974 x DZ-01-2786, DZ-01-974 x DZ-Cr-37 and Alba x Kaye Murri. To estimate the correlations and path coefficients between yield and yield components, 63 F4 families were taken randomly from each of the three crosses. The 189 F4 families, five parents and two checks were space planted following in 14 x 14 simple lattice design. Study of associations among traits indicated that yield was positively associated with shoot biomass, harvest index, lodging index and panicle kernel weight at phenotypic level at Debre Zeit. At Akaki, yield had significant positive correlation with shoot biomass, harvest index, plant height, panicle length and panicle weight. At genotypic level, grain yield per plot exhibited positive association with harvest index, shoot biomass, lodging index and panicle kernel weight at Debre Zeit. By contrast, days to heading, days to maturity, plant height and panicle length showed negative association with yield. At Akaki, kernel yield per plot was positively correlated at genotypic level with all the traits considered where lodging index had the highest correlation followed by shoot biomass, panicle kernel weight and harvest index. Path coefficient analysis at both phenotypic and genotypic levels for both the locations suggested those shoot biomass and harvest indexes are the two important yield determining traits. These two traits might be useful in indirect selection for yield improvement in the material generated from the three crosses under consideration.

  10. Crop coefficient, yield response to water stress and water productivity of teff (Eragrostis tef (Zucc.)

    NARCIS (Netherlands)

    Araya, A.; Stroosnijder, L.; Girmay, G.; Keesstra, S.D.

    2011-01-01

    In the semi-arid region of Tigray, Northen Ethiopia a two season experiment was conducted to measure evapotranspiration, estimate yield response to water stress and derive the crop coefficient of teff using the single crop coefficient approach with simple, locally made lysimeters and field plots.

  11. maize silage and/or eragrostis curvula hay for wintering pregnant ...

    African Journals Online (AJOL)

    end of mating and the rate of conception. As the body mass of the cows at the end of the breeding season decreased from 435 kg (silage) to 378 kg (veld) reconception de- creased from 87,5 %to 25%(Table I). This tends to substan- tiate the fmdings of Lamond (1970), who refers to a criti- calor target mass before conception.

  12. Fluoride levels in tef [Eragrostis tef (Zucc.) Trotter] and enjera and its ...

    African Journals Online (AJOL)

    The main objective of this study was to estimate the fluoride levels in tef grain and in enjera, its fermentation product in different regions of Ethiopia, especially in the regions where tef is dominantly cultivated. The effect of water used to bake the enjera was assessed by preparing fluoride-containing water in the laboratory.

  13. Tef (Eragrostis tef) Variety "Dagim" አህፅሮት Abstract Introduction

    African Journals Online (AJOL)

    HP

    Solomon et al. [132]. Tef is the major Ethiopian cereal grown on 3.02 million hectares annually. (CSA, 2015), and serving as staple food grain for over 70 million people. The crop constitutes 30% of the total area allocated to cereals and contributes more than 20% of the total cereals production (CSA. 2015). The.

  14. Ingeniería Energética, 2016:XXXVII(1:45-54, Enero/Abril, ISSN 1815-5901 45 Análisis energético de un sistema fo tovoltaico integrad o a una cubierta plana horizontal; Energetic analysis of a photovoltaic system integrated to a horizontal flatrooftop

    Directory of Open Access Journals (Sweden)

    Liomnis – Osorio Laurencio

    2016-02-01

    Full Text Available En el presente trabajo se analiza el desempeño energético de un sistema fotovoltaico a base de silicio amorfo, integrado a la cubierta plana horizontal del Edificio Docente # 2 del Instituto Superior Minero Metalúrgico de Moa. Con el software PV syst se determinó la producción anual de ene rgía eléctrica del sistema de 3 kWp conectado a la red, así como las pérdidas por sombras, cableado, electrón ica de potencia, modificación del ángulo de inclinación y por efecto de la irradiancia y temperatura. Tambi én se calcularon los parámetros característicos de la instalación, útiles para establecer perfiles mensuales para la planificación del consumo eléctrico. Los resultados demostraron que la energía anual generada, es equivalente al co nsumo eléctrico del Instituto durante dos días y además, constituye una alternativa para la generación de energí a, a partir del aprovechamiento de espacios disponibles en azoteas de las áreas docentes y administrativas. In this research the energy performance of a photovolta ic system based on amorphous silicon is analyzed. It is integrated to the flat horizontal rooftop of Teaching Building # 2 of the Metallurgical Mining Institute of Moa. With the PVsyst software annual electricity production of 3 kWp system connected to grid, as well as losses shadows, wiring, power electronics, also, tilt angle and the effect of irradiance and temperature were determined. The characteristic parameters of the installation, useful were calculated to establish monthly planning profiles for electrical consumption. The results showed that the annual energy generated is equivalent to the electricity consumption of the Institute for two days and also an alternative for generation energy from the use of space available on rooftops of teaching and administrative areas.

  15. Comparação entre os métodos de aplicação de fluido de corte convencional e otimizado na retificação plana de cerâmicas Grinding of alumina ceramics with different cooling and lubrification techniques: conventional and minimum quantity of lubrification (MQL

    Directory of Open Access Journals (Sweden)

    D. M. Iceri

    2012-03-01

    Full Text Available Com o grande crescimento tecnológico e a necessidade de melhoria, um dos materiais que ganhou uma grande gama na área da engenharia mecânica é a cerâmica, pois possui vantagens físico-químicas e propriedades mecânicas significativas sobre o aço. Entretanto, sua usinagem é um processo difícil e delicado, que requer ainda uma grande atenção em relação ao seu estudo. Assim, o processo de retificação é um dos métodos que tem apresentado bons resultados, porém um grande problema acerca de tal processo é o uso excessivo de fluidos de corte, o que se tornou uma preocupação mundial, já que os fluidos apresentam graves problemas socioambientais, além disso, o fluido de corte é responsável por uma grande parte do custo final do processo, provocando, desse modo, um grande interesse em pesquisas referentes a métodos alternativos de forma a reduzir o consumo e melhorar as características do fluido de corte utilizado. Este trabalho visa comparar duas técnicas de lubri-refrigeração, o método convencional e a Lubrificação Otimizada. O uso do método otimizado é uma alternativa à diminuição do volume de fluido utilizado, já que este tem como princípio a aplicação de uma menor quantidade de fluido de corte com uma alta velocidade, localmente aplicada, ou seja, com essa redução benefícios ambientais e socioeconômicas são obtidos. A análise do trabalho será feita a partir da avaliação das variáveis de saída do processo de retificação plana tais como o comportamento rugosidade e desgaste do rebolo, já que por elas é possível avaliar o processo em relação a qualidade da peça versus custo. Com essas analises, pretende-se avaliar se a técnica otimizada é viável a substituição da refrigeração convencional na retificação plana de cerâmicas.The great technological growth and the improvement needs, a material that has gained a wide range in mechanical engineering is the ceramics because of its

  16. Las inundaciones de la Plana de Castelló

    OpenAIRE

    Segura Beltrán, Francisca S.

    2006-01-01

    La llanura costera comprendida entre Benicàssim y Borriana, conformada por numerosos abanicos aluviales ¿entre los que se asientan marjales en fase de colmatación¿ resulta anegada por las aguas de forma recurrente. En la zona de estudio se identifica una variada tipología de inundaciones dependiendo de la morfología del terreno y de la acción antrópica. La desaparición de los barrancos ¿sector al norte del Millars¿, las secciones insuficientes ¿Riu Sec de Borriol¿, la ocupación de cauces y pa...

  17. Dinámica de una huella plana turbulenta alejada

    Directory of Open Access Journals (Sweden)

    Vladimir N Grebenev

    2009-02-01

    Full Text Available From the conservation equation of the quantity of movement and the kinetic energy of the studied turbulence, the dynamics of flat and turbulent path in a non comprehensive liquid environment. In the case of a liquid flow of a path, it is proved that the considered models is well formulated, and the asymptotic properties of the solution are studied. Keywords: Fluid mechanics, turbulence, parabolic equation.

  18. Indications and Visual Outcome of First Hundred Pars Plana ...

    African Journals Online (AJOL)

    tulyasys

    prevention programs because it is assumed that they are not a common cause of blindness and the outcome of treating retinal diseases do not justify the effort and expense involved.[4] The huge cost of equipment and shortage of trained man.

  19. Ajuste de particiones planas mediante diagramas de Voronoi discretos

    OpenAIRE

    García Bernal, Daniel

    2017-01-01

    La geometría computacional se centra en el diseño y análisis de algoritmos para problemas geométricos. En la última decada, esta disciplina ha atraído un enorme interés. Pero ha sido en los últimos a~nos cuando se ha incrementado el interés en una estructura geométrica, concretamente los diagramas de Voronoi. No solo por sus características y propiedades matemáticas, sino también por aparecer ampliamente relacionados con fenómenos y procesos físicos que se dan en la naturale...

  20. Comparação de parâmetros periodontais após utilização de contenção convencional 3x3 plana e contenção modificada Comparison of periodontal indexes after the use of conventional 3X3 plain retainer and modified retainer

    Directory of Open Access Journals (Sweden)

    Bianca Keiko Shirasu

    2007-02-01

    Full Text Available OBJETIVO: o presente estudo teve como propósito comparar os parâmetros periodontais após a utilização de dois tipos de contenções ortodônticas fixas: contenção convencional 3x3 plana (fio ortodôntico 0,8mm retilíneo fixado apenas nos caninos contralaterais e a contenção modificada (fio ortodôntico 0,6mm com dobras permitindo o livre acesso do fio dental e fixado em todos os dentes do segmento anterior. METODOLOGIA: quinze voluntários primeiramente utilizaram a contenção convencional por seis meses. Após um intervalo de quinze dias, foi instalada a contenção modificada, utilizada pelo mesmo período de tempo. Antes de cada fase os voluntários passaram por raspagem e alisamento radicular dos dentes e orientação de higiene bucal. Ao final de cada fase os seguintes parâmetros foram avaliados: índice de placa dentária, índice gengival e índice de cálculo dentário. Além disso, foi realizada a mensuração do cálculo no fio da contenção e todos os voluntários responderam a um questionário sobre a utilização, aceitação e conforto dos dois tipos de contenções. RESULTADOS E CONCLUSÕES: foi observado que o índice de placa e o índice gengival foram maiores para a contenção modificada (pAIM: the purpose of the present study was to compare periodontal indexes after the use of two types of bonded fixed retainers: conventional 3x3 plain retainer (orthodontic wire 0.8mm, bonded to the canine teeth only and the modified retainer (0.6mm multi strand wire, allowing free access to dental floss and bonded to all anterior teeth. METHODS: a test group of fifteen patients used the conventional retainer for 6 months. After a two week interval, the modified retainer was used for another 6 months. Previous to each phase, the patients went through tooth scaling, root planing and oral hygiene orientation. At the end of each phase the dental plaque index, gingival index and dental calculus index were evaluated. Furthermore, the

  1. Controle de invasão biológica por capim-anonni em margem viária mediante a introdução de gramíneas Control of biological invasion by South African lovegrass on a roadside by introducing grasses

    Directory of Open Access Journals (Sweden)

    Renato Borges de Medeiros

    2011-02-01

    Full Text Available Objetivou-se avaliar o controle da invasão biológica por Eragrostis plana Nees (capim-anonni em margens de rodovia com a introdução de gramíneas concorrentes associada a práticas de preparo do solo e adubação. O delineamento experimental foi em blocos casualizados com parcelas subdivididas e três repetições. Nas parcelas, foram avaliadas duas práticas de preparo do solo: solo subsolado e gradeado com aplicação de calcário e fósforo; e solo apenas subsolado, e nas subparcelas, as espécies de gramíneas: capim-mombaça (Megathyrsus maximus (Jacq. B. K. Simon & S. W. L. Jacobs; capim-kazangula (Setaria sphacelata (Schumach. Stapf & C. E. Hubb. ex M. B. Moss; mistura de sementes de três gramíneas nativas, grama-de-forquilha (Paspalum notatum Alain ex Flüggé, macega-do-banhado (Paspalum regnelli Mez e capim-das-roças (Paspalum urvillei Steud.; avaliadas em comparação a uma subparcela de exclusão (testemunha. Nos levantamentos florísticos, realizados em 8 de janeiro de 2005, e após o plantio, em 26 de janeiro e 25 de junho de 2006, observou-se alta riqueza florística, com 86 espécies botânicas distribuídas em 29 famílias e 21% de espécies exóticas. O solo subsolado, gradeado, corrigido e adubado, associado às introduções de M. maximus e S. kazungula, foram as alternativas que mais contribuíram para reduzir a cobertura de E. plana. As gramíneas nativas presentes na vegetação do acostamento, Paspalum plicatulum Mitchx, Piptochaetium montevidense (Spreng. Parodi e a espécie nativa introduzida (Paspalum urvillei têm potencial para controlar a invasão de E. plana.The objective of this study was to control biological invasion by Eragrostis plana Nees (South African lovegrass on a roadside by introducing competitor grasses associated with soil management and fertilization practices. The experimental design was a complete randomized block with split-plots parcels and three replications. In the parcels, it was

  2. Análisis de crecimiento de canavalia en zona plana del Valle del Cauca

    Directory of Open Access Journals (Sweden)

    Cortés R. Harry

    2005-12-01

    Full Text Available El análisis se realizó en condiciones de campo, en dos localidades (Candelaria y Palmira, determinando los componentes de rendimiento (kg, altura (cm y fenología (dds/floración. Se empleó un diseño completamente al azar con cinco repeticiones. El crecimiento de C. ensiformis no mostró diferencias entre las localidades evaluadas. El desempeño fisiológico en la acumulación de fotosintatos se concentró en mayor proporción en el órgano vertedero “frutoâ€?, que representa entre el 60 y 75% de MS total. La dinámica de acumulación de MS mostró correlación en los índices medidos (TCC, TCR, TAN, IAF. Abstract Analysis of growth of canavalia in the plane zone of Valle del Cauca. Under conditions of field, in two localities (Candelaria and palmira, determining the components of yield (Kg, height (cm and fenology (d/flower. A design at random with five (5 repetitions was used completely. The growth of Canavalia ensiformis does not show differences enters the evaluated localities. The physiological performance in the accumulation of photosintates is it accumulated in greater proportion in the organ garbage dump “fruitâ€?, that represents between 60 and 75% of dry matter. The dynamics of accumulation of MS shows correlation in the measured indices (NAR, LAI, RGR. Key words: Canavalia ensiformis, biological analysis, phenology, yield components.

  3. Un laboratorio virtual para la enseñanza de momentos de inercia de figuras planas

    Directory of Open Access Journals (Sweden)

    Fernando Giménez

    2011-06-01

    Full Text Available In this work, we present a graphic user interface (Gui developed in MatlabQc to easily obtain the gravity center and the matrix of inertia of a plane domain. It is allowed to include holes, an also to consider curved or straight edges. The application represents graphically the domain, the position of the centre of gravity and the principal axes of inertia. From a pedagogical point of view, it can be usefully employed in the context of different subjects in university teaching, such as: Physics, Strength of Materials, Structural Analysis, etc.

  4. Detecção de dano estrutural em estruturas planas utilizando redes neurais

    OpenAIRE

    Maia, Renato Abreu

    2017-01-01

    Conforme as tecnologias de projeto e construção avançam, as estruturas tendem a surgir cada vez mais esbeltas, o que as torna mais vulneráveis a vibrações excessivas. Aliado a isso, a possível degradação estrutural de construções antigas tem gerado um crescimento no desenvolvimento e aprimoramento de técnicas de monitoramento de integridade estrutural, em especial ferramentas que fazem uso das propriedades dinâmicas das estruturas (frequências naturais e modos de vibração), visto que estas so...

  5. Optical coherence tomography imaging of chorioretinal folds associated with hypotony maculopathy following pars plana vitrectomy

    Directory of Open Access Journals (Sweden)

    Williams Jr BK

    2015-09-01

    Full Text Available Basil K Williams Jr, Jonathan S Chang, Harry W Flynn Jr Department of Ophthalmology, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA Abstract: Chorioretinal folds may occur as a consequence of hypotony and can be a cause of vision loss when associated with macular involvement. In this report, the spectral domain ocular coherence tomography imaging of three patients with chorioretinal folds before and after management are presented. The cases had unique presentations and each underwent different management approaches, but the results included improved visual acuities and lessened chorioretinal folds. Keywords: hypotony, chorioretinal folds, ocular coherence tomography

  6. Compactación potencial en dos suelos de la parte plana del Valle del Cauca

    Directory of Open Access Journals (Sweden)

    Edgar Madero-Morales

    2012-01-01

    Full Text Available Muestras de los primeros 20 cm de la superficie de dos suelos en CIAT-Palmira (Calciustol y Haplustol, vérticos mezclados francos isohipertérmicos con pendiente 0.5%, utilizados en coberturas tanto de bosque secundario como de cultivos diversos por más de cincuenta años consecutivos, fueron compactados en el aparato de Richards bajo dos condiciones de humedad (0.1 y 0.5 bar para comparar el punto de máxima compactación, y su influencia en la variación de la densidad aparente, la tasa de difusión de oxígeno, la porosidad de aireación, la conductividad hidráulica saturada y el módulo de ruptura. Se utilizó un diseño completamente al azar con arreglo factorial (dos suelos, por dos usos, por dos humedades con tres repeticiones. Para la separación de medias se utilizó la prueba de Duncan (P < 0.05. El estudio concluye que los altos contenidos de M.O. no siempre evitan la degradación del suelo por efecto del tráfico de maquinaria en contenidos de humedad altos; independientemente del uso, el Calciustol más limoso tuvo ligeramente mayor potencial a la compactación que el Haplustol; y el cultivo continuado de los dos suelos los ha hecho más susceptibles al daño físico, ya que en estado muy húmedo, se compactaron al extremo y mostraron el deterioro físico que en la práctica puede acarrear el tráfico de maquinaria sobre el suelo, y en estado húmedo se compactaron moderadamente.

  7. Compactación potencial en dos suelos de la parte plana del Valle del Cauca

    Directory of Open Access Journals (Sweden)

    Madero Morales Edgar

    2012-03-01

    Full Text Available Muestras de los  primeros 20 cm de la superficie de dos suelos en CIAT -Palmira (Calciustol y Haplustol% vérticos mezclados francos isohipertérmicos con pendiente 0.5%, utilizados en coberturas tanto de bosque secundario como de cultivos diversos por más de cincuenta años consecutivos, fueron com- pactados en el aparato de Richards bajo dos condiciones de humedad (0.1 y 0.5 bar para comparar el punto de  mãxima compactación% y su in3uencia en la 4ariación de la densidad aparente% la tasa  de difusión de oxígeno, la porosidad de aireación, la conductividad hidráulica saturada y el  módulo de ruptura. Se utilizó un diseño completamente al azar con arreglo factorial (dos suelos, por dos usos, por dos humedades con tres repeticiones. Para la separación de medias se utilizó la prueba de Duncan (P < 0.05. El  estudio concluye que los altos contenidos de M.O. no siempre evitan la degradación del suelo por e6ecto del  trãfico de maquinaria en contenidos de 9umedad altos= independientemente del uso, el Calciustol más limoso tuvo ligeramente mayor potencial a la compactación que el Haplustol; y el cultivo continuado de los dos suelos los ha hecho más susceptibles al daño físico, ya que en esta- do  muy húmedo, se compactaron al extremo y mostraron el deterioro físico que en la práctica puede acarrear el trãfico de maquinaria so>re el suelo% y en estado 9ümedo se compactaron moderadamente.

  8. The Safety and Efficacy of Adjustable Postoperative Position after Pars Plana Vitrectomy for Rhegmatogenous Retinal Detachment

    OpenAIRE

    Lin, Zhong; Sun, Jin Tao; Wu, Rong Han; Moonasar, Nived; Zhou, Ye Hui

    2017-01-01

    Purpose. To report the safety and efficacy of adjustable postoperative position for rhegmatogenous retinal detachment (RRD). Methods. Retrospective review of 536 consecutive RRD eyes that underwent vitrectomy surgery for retina repair from year 2008 to 2014. The retinal breaks were divided into superior, lateral (nasal, temporal, and macular), and inferior locations, according to the clock of breaks. Patients with superior and lateral break location were allowed to have facedown position or l...

  9. 76 FR 21907 - Draft Action Plan-A Public Health Action Plan To Combat Antimicrobial Resistance

    Science.gov (United States)

    2011-04-19

    ... Infectious Diseases, Division of Healthcare Quality Promotion, Office of Antimicrobial Resistance, Attn... Promotion, Office of Antimicrobial Resistance; 1600 Clifton Road, NE., Mailstop A-07, Atlanta, Georgia 30333... agencies in addressing antimicrobial resistance (AR) in recognition of the increasing importance of AR as a...

  10. 76 FR 14402 - Draft Action Plan-A Public Health Action Plan To Combat Antimicrobial Resistance

    Science.gov (United States)

    2011-03-16

    ... Infectious Diseases, Division of Healthcare Quality Promotion, Office of Antimicrobial Resistance, Attn... Promotion, Office of Antimicrobial Resistance; 1600 Clifton Road, NE., Mailstop A-07, Atlanta, Georgia 30333... agencies in addressing antimicrobial resistance (AR) in recognition of the increasing importance of AR as a...

  11. Nueva estación de ferrocarril en Castellón de la Plana

    Directory of Open Access Journals (Sweden)

    Mossenta-Nogal, Navarro-

    2001-08-01

    Full Text Available The new railway station at Castellon is located on the main line running down Spain’s Mediterranean coast on a stretch of almost 5 kilometres of track that has been placed underground in a tunnel in order to allow for the redevelopment the western edge of the city. The singularity of the station lies in the fact that it is placed in a large cutting that has been opened up above the lines thus breaking the monotony of the tunnel and allowing natural light lo illuminate the platforms which themselves can be seen from street level. A large boat-like structure covers the cutting resembling a Mediterranean market, a covered area that accommodates the concourse, public spaces and the transverse communications platform between the railway platforms at an intermediate leve1 between those and street level. The outstanding elements in the design of the station are the large full bore beams of variable section which describe the curvature of the glass roof and the infernal covering/lining of the boat, the concrete wall screens projecting from the service buildings, above those that these are supported by, and the southern station main entrance, walls of white concrete.La Nueva Estación de Ferrocarril de Castellón, se inserta dentro de la operación ferroviaria del Corredor Mediterráneo, que a su paso por la ciudad va soterrado en un tramo de casi 5 km, permitiendo la recualificación de la periferia oeste. La singularidad de la estación está en la apertura de un importante hueco sobre las vías que rompe la monótona secuencia del túnel haciendo que la luz llegue hasta los andenes, ofreciendo también una cierta visión de/desde la calle. Una gran nave cubre el hueco sobre el soterramiento al modo de una lonja mediterránea, plaza interior que aloja el vestíbulo, las zonas públicas y la plataforma transversal de comunicación entre andenes a una altura intermedia entre éstos y la calle. Las piezas mas características del diseño del edificio son la estructura de grandes vigas de alma llena y sección variable que trazan la curvatura de la marquesina y cubierta interior envolvente de la nave, las pantallas emergentes del edificio de servicios, sobre las que éstas se apoyan, y el cerramiento sur-acceso principal de la estación, elementos murarios de hormigón blanco.

  12. Las pinturas del Barranc deis Cirerals Ares del Maestre (Castellón de la Plana

    Directory of Open Access Journals (Sweden)

    Elisa SARRIÁ

    2009-10-01

    Full Text Available En los últimos años hemos venido realizando una serie de exploraciones por los relieves montañosos del Maestrazgo, al norte de la provincia de Castellón, con el fin de reunir todas las citas sobre el arte rupestre, tanto del ámbito levantino como del esquemático, este último todavía muy poco conocido en este área peninsular.

  13. Early postoperative endophthalmitis after pars plana Ahmed valve placement with persistent extraocular infection.

    Science.gov (United States)

    Park, Susanna S; Rabowsky, Jeffrey

    2007-01-01

    This article presents a case of early postoperative endophthalmitis that occurred after vitrectomy and Ahmed Glaucoma Valve (New World Medical, Inc., Rancho Cucamonga, CA) placement and was treated with intravitreal antibiotics. Intravenous vancomycin was started after aqueous culture grew methicillin-resistant Staphylococcus aureus. The endophthalmitis improved, but new purulent discharge around the peritomy was noted 10 days after presentation, requiring removal of the valve.

  14. PREDIKCIJA EGZISTENCIJE BUSINESS PLANA TEMELJEM PARAMETARA STATUSA VRHUNSKIH SPORTSKIH MENADŽERA

    Directory of Open Access Journals (Sweden)

    Danijela Bonacin

    2008-08-01

    Full Text Available With a sample of 66 high positioned sport managers in Bosnia and Herzegovina, it was applied a questionnaire composed of 40 questions connected with characteristics of top-level managers. Those data were processed by standard regression analysis with business plan as criterion. The results show significant relations of business plan with development strategies, law in sport, with in formation from ministry, as well as with intentions of management education, opinions that it is better that manager is selected from sport and with time on actual job. Negative prediction is found in field of seminars organizations and foreign language knowledge.

  15. Teff (Eragrostis tef) as a raw material for malting, brewing and manufacturing of gluten-free foods and beverages: a review.

    Science.gov (United States)

    Gebremariam, Mekonnen Melaku; Zarnkow, Martin; Becker, Thomas

    2014-11-01

    The demand for gluten-free foods is certainly increasing. Interest in teff has increased noticeably due to its very attractive nutritional profile and gluten-free nature of the grain, making it a suitable substitute for wheat and other cereals in their food applications as well as foods for people with celiac disease. The main objective of this article is to review researches on teff, evaluate its suitability for different food applications, and give direction for further research on its applications for health food market. Teff is a tropical low risk cereal that grows in a wider ecology and can tolerate harsh environmental conditions where most other cereals are less viable. It has an excellent balance of amino acid composition (including all 8 essential amino acids for humans) making it an excellent material for malting and brewing. Because of its small size, teff is made into whole-grain flour (bran and germ included), resulting in a very high fiber content and high nutrient content in general. Teff is useful to improve the haemoglobin level in human body and helps to prevent malaria, incidence of anaemia and diabetes. The nutrient composition of teff grain indicates that it has a good potential to be used in foods and beverages worldwide. The high levels of simple sugars and α-amino acids as a result of breakdown of starch and protein, respectively, are essential for fermentation and beer making.

  16. Interações entre herbicidas e protetores para o controle de capim-annoni em pastagem natural Interactions among herbicides and safeners for the south african lovegrass control in natural grassland

    Directory of Open Access Journals (Sweden)

    Ives Clayton Gomes dos Reis Goulart

    2012-10-01

    Full Text Available A similaridade botânica do capim-annoni com as espécies forrageiras nativas ou cultivadas dificultam o seu controle em pastagens naturais. O objetivo deste trabalho foi avaliar o efeito de associações entre herbicidas e protetores sobre o controle de capim-annoni e a seletividade em pastagem natural. Foram realizados dois experimentos a campo em área de pastagem natural típica do Bioma Pampa avaliando-se herbicidas aplicados em pré e pós-emergência. Outro experimento foi conduzido em casa de vegetação com as espécies capim-annoni e grama forquilha onde foram avaliados os herbicidas glufosinate-ammonium e imazethapyr. Em ambos os experimentos os herbicidas foram avaliados isolados ou em associação com os protetores anidrido naftálico, dietholate e fluxofenim. Os experimentos a campo demonstraram que os herbicidas aplicados em pré ou pós-emergência em interação com os protetores não proporcionaram controle satisfatório do capim-annoni e nem aumento da seletividade à pastagem natural. Por outro lado, o experimento em condições controladas indicou a ocorrência de sinergismo do herbicida glufosinate-ammonium em interação com os protetores anidrido naftálico, dietholate e fluxofenim sobre o capim-annoni. As diferenças relacionadas a estádio de desenvolvimento e densidade de infestação estão relacionadas as variações das respostas nos estudos a campo e em condições controladas. A utilização de herbicidas em associações com protetores apresenta potencialidade de controle seletivo de capim-annoni quando aplicado em plantas em estádios iniciais de desenvolvimento.The botanical similarity of the invasive weed Eragrostis plana Nees (South African lovegrass difficult its selective control in natural pastures. The aim of this study was to evaluate the effect of the association between herbicides and safeners on the control of E. plana and on the selectivity to the natural pastures. Two experiments were conducted at

  17. 77 FR 38296 - Draft Public Health Action Plan-A National Public Health Action Plan for the Detection...

    Science.gov (United States)

    2012-06-27

    ... Prevention and Health Promotion, Division of Reproductive Health, Attn: National Public Health Action Plan... Disease Prevention and Health Promotion, Division of Reproductive Health, 4770 Buford Highway NE... topic's public health importance, existing challenges, and opportunities for action to decrease the...

  18. 77 FR 28883 - Draft Public Health Action Plan-A National Public Health Action Plan for the Detection...

    Science.gov (United States)

    2012-05-16

    ... Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion... Promotion, Division of Reproductive Health, 4770 Buford Highway NE., Mailstop K-34, Atlanta, Georgia 30341... health importance, existing challenges, and opportunities for action to decrease the impact of...

  19. Corrigendum - Intraocular pressure changes following the use of silicone oil or Densiron 68 as endotamponade in pars plana vitrectomy

    Directory of Open Access Journals (Sweden)

    Romano MR

    2010-12-01

    Full Text Available Romano MR, Angi M, Romano V, et alA word was omitted from the conclusion of the Abstract. The correct version is as follows:Conclusion: Overall, the use of Densiron 68 was not associated with significantly higher IOP values as compared with SSO.

  20. Modelagem e simulaçâo de colisôes planas entre corpos rígidos

    OpenAIRE

    Cataldo, Edson; Sampaio, Rubens

    2002-01-01

    Em geral, o movimento de corpos se dá em ambiente com barreiras podendo ocorrer colisôes. Para que seja possível fazer previsôes da dinâmica é necessário saber o que acontece quando um corpo colide. O problema é portanto: conhecida a dinâmica do corpo pré-colisâo e as propriedades dos corpos que colidem, prever a dinâmica pós-colisâo. Os primeiros trabalhos publicados sobre o assunto datam de 1668 e, até 1984, os modelos existentes pareciam satisfatórios. Porém, a aplica¸câo de um desse...

  1. Urban Risk Reduction Through Effective Disaster Management Plan-A Case Study Of Shimla City Himachal Pradesh India

    Directory of Open Access Journals (Sweden)

    Bhavna Karki

    2015-02-01

    Full Text Available Abstract By 2050 70 of the worlds population will live in urban areas. In India the urban population has increased from 217 million to 377 million in last two decades .With increasing population the associated risk and vulnerability has also increased. As cities continue to grow there is increased pressure on resources exposure of lives livelihoods and economic social and environmental assets to risk is set to increase exponentially. Recognised as one of the best cities for public services and one of the oldest Municipal Corporation in India Shimla city is situated at the traverse spur of the Central Himalayas at 31004 N to 31010 N latitude and 77005 E to 77015 E longitude at an altitude of 2397.59 m metres amsl. This paper aims at underlying the role of Shimla Municipal Corporation SMC as local government in managing disasters in the city along with effective planning and risk assessments.

  2. Contrast Sensitivity after Pars Plana Vitrectomy: Comparison between Macula-On and Macula-Off Rhegmatogenous Retinal Detachment.

    Science.gov (United States)

    Kawamura, Hajime; Fujikawa, Masato; Sawada, Osamu; Sawada, Tomoko; Saishin, Yoshitsugu; Ohji, Masahito

    2016-07-01

    To evaluate the contrast sensitivity (CS) of eyes successfully repaired by vitrectomy for rhegmatogenous retinal detachment (RRD) with or without preoperative macular involvement. In this retrospective, consecutive, interventional case series, 109 eyes received primary vitrectomy for RRD, of which 36 with at least 12 months of follow-up and a best-corrected visual acuity (BCVA) ≥1 at 12 months postoperatively were investigated. The main outcome measurements were BCVA and CS at 12 months postoperatively. Patients with macula-on RRD preoperatively were included in the macula-on group, and patients with macula-off RRD preoperatively were included in the macula-off group. The between-group difference in CS under evening vision conditions was measured with a Takagi glare tester CGT-2000 at 6 visual angles and 13 contrast levels with and without glare. CS was significantly lower in the macula-off group for targets with visual angles of 1.6, 1.0, and 0.64° with glare (p macula-off RRD patients with good postoperative BCVA compared to macula-on RRD patients with good postoperative BCVA. © 2016 S. Karger AG, Basel.

  3. Compactación potencial en dos suelos de la parte plana del Valle del Cauca. Parte II

    Directory of Open Access Journals (Sweden)

    García Luis Fernando

    2011-09-01

    Full Text Available Muestras de los primeros 20 cm de la superficie de dos suelos (Calciustol y Haplustol, los dos vérticos mezclados francosos isohipertérmicos con pendiente 0.5%, en diferentes cultivos en el CIAT-Palmira, fueron compactados en el aparato de Richards en dos condiciones de humedad (0.1 bar y 0.5 bar para medir el punto de máxima compactación, estimado a través de la variación de la densidad aparente, la tasa de difusión de oxígeno, la porosidad de aireación, la conductividad hidráulica saturada y el módulo de ruptura. Se incluyeron dos testigos bajo cobertura de bosque natural en los mismos suelos y se utilizó un diseño completamente al azar con arreglo factorial (2 suelos x 2 usos x 2 humedades con tres repeticiones. Para la comparación de medias se utilizó la prueba de Duncan (P < 0.05. Los suelos cultivados fueron potencialmente más susceptibles a la compactación que los de bosque, a pesar de que los primeros presentaban un contenido promedio de 4% de M.O. En condiciones de alta humedad (0.1 bar los suelos cultivados presentaron igualmente mayor potencial de compactación. Calciustol resultó con mayor potencial a la compactación, independientemente del uso. El estudio sugiere que los altos contenidos de M.O no siempre evitan la degradación por trãfico de maquinaria en condiciones de alto contenido de humedad.

  4. Experimental anaerobic digestion generator coupled at a plan plates solar collector; Biodigestor experimental acoplado a coletor solar de placas planas

    Energy Technology Data Exchange (ETDEWEB)

    Kaneshiro, Tsuneharu [Brasilia Univ., DF (Brazil); Venanzi, D. [Sao Paulo Univ., Sao Carlos, SP (Brazil). Escola de Engenharia; Medeiros, J.T.N. de [Rio Grande do Norte Univ., Natal, RN (Brazil)

    1987-12-31

    Analysis of results of research in course in solar energy used as heat source to anaerobic degradation in organic matter are presented; water is circulated around the generator to rise and maintain a constant process. (author). 16 refs., 2 figs

  5. Visual Outcomes of Pars Plana Vitrectomy with Epiretinal Membrane Peeling in Patients with Asteroid Hyalosis: A Matched Cohort Study.

    Science.gov (United States)

    Mouna, Ali; Berrod, Jean-Paul; Conart, Jean-Baptiste

    2017-01-01

    The study aimed to evaluate outcomes of epiretinal membrane (ERM) peeling in patients with asteroid hyalosis (AH) and to compare them with those from controls without AH. This is a retrospective matched cohort study of 1,104 consecutive patients who underwent surgery for ERM between January 2004 and February 2014. Patients with AH were included in the study group and were matched for preoperative visual acuity, age, gender, date of surgery, and axial length with control patients without AH selected from the same cohort. The best-corrected visual acuity (BCVA) and central macular thickness (CMT) on optical coherence tomography were measured at baseline and postoperatively with a minimum follow-up period of 12 months. A total of 44 patients were included in the AH group and 44 in the control group. The mean initial BCVA was 0.53 ± 0.21 LogMAR for the AH group vs. 0.49 ± 0.20 LogMAR for the control group, and the mean initial CMT was 419 ± 74 vs. 423 ± 75 µm, respectively. During the follow-up, no significant difference was found regarding the final BCVA at 6 months (0.23 ± 0.14 vs. 0.24 ± 0.17) LogMAR (p = 0.87) and 12 months (0.16 ± 0.09 vs. 0.17 ± 0.12) LogMAR (p = 0.92), despite a tendency toward slower visual recovery for the AH group at 1 month, with a mean BCVA of 0.36 ± 0.12 vs. 0.28 ± 0.18 LogMAR (p = 0.08). No difference was found regarding the progression of CMT at 1.6 and 12 months with a mean CMT of 396 ± 47 vs. 378 ± 55 µm (p = 0.39), 356 ± 39 vs. 365 ± 41 µm (p = 0.48), and 349 ± 68 vs. 352 ± 53 µm (p = 0.87), respectively. Vitrectomy with ERM peeling in patients with AH was beneficial and showed similar functional and anatomical outcomes in both groups. AH does not seem to affect visual improvement or the complication rate after ERM peeling. Therefore, the indications for vitrectomy in case of ERM should not be prompted by the presence of AH. © 2017 S. Karger AG, Basel.

  6. Estabilidad estructural y erosión en suelos de uso agrícola de la Plana de Vic

    OpenAIRE

    Girbau Junyent, J.; Josa March, R.

    1989-01-01

    Se estudia la relaci6n entre erosibn y estabilidad estructural del horizonte Ap en una toposecuencia de suelos cultivados de Osona. Se evidencia la contribución del ca2+ a la estabilidad de estructura (método de Hénin) y en consecuencia, la disminucidn de perdidas por arroyada difusa.

  7. Produção Arbórea e Animal em Sistema Silvipastoril com Acácia-negra (Acacia mearnsii Trees and Animal Production in a Silvipastoral System with Black Wattle (Acacia mearnsii

    Directory of Open Access Journals (Sweden)

    Zelia Maria de Souza Castilhos

    2010-02-01

    Full Text Available

    Com o objetivo de avaliar o desempenho dos componentes arbóreo e animal em um sistema silvipastoril (SSP com acácia-negra (Acacia mearnsii De Wild e gramíneas perenes de verão, foi conduzido um trabalho em convênio com a empresa Seta S.A., na unidade da Fepagro em Tupanciretã, RS, no período de outubro de 1995 a maio de 2003. O delineamento experimental foi um bifatorial (espécie forrageira e densidade arbórea inteiramente casualizado, com duas repetições. As espécies forrageiras (EF avaliadas foram capim annoni (Eragrostis plana, braquiária (Brachiaria brizantha e capim gatton (Panicum maximum cv. Gatton nos quatro primeiros anos, e capim gatton, capim aruana (P. maximum cv. Aruana e capim pangola (Digitaria diversinervis para os demais anos. As densidades arbóreas (DA testadas foram de 1.667, 1.000, 833 e 500 árvores.ha-1. Com 1.667 árvores.ha-1 houve maior rendimento de madeira em todas as avaliações, não diferindo de 1.000 árvores/ha-1 a partir do quinto ano. A produtividade animal foi mais elevada em DA de 833 e 500 árvores.ha-1, sendo respectivamente 229 e 223 kg.ha-1 de peso vivo. Aos sete anos de implantação da acácia negra, o volume de madeira foi de 166; 143; 86 e 51 m3.ha-1, respectivamente, nas densidades arbóreas de 1.667; 1.000; 833 e 500 árvores.ha-1. Para que haja um equilíbrio entre produção arbórea e animal, SSPs com densidades arbóreas entre 1.000 e 833 árvores.ha-1 apresentam-se como alternativas viáveis para os produtores rurais.

     

    doi: 10.4336/2009.pfb.60.39

    A silvopastoral study consisting of black wattle (Acacia mearnsii De Wild and tropical perennial grasses was developed at the Fepagro Research Unity in Tupanciretã, RS, in collaboration with Seta Group, from October 1995 until May 2003, with the objective of evaluating trees and animal (beef cattle performances. The experiment was a bifactorial completely randomized design (forage specie and arboreal density with two

  8. African Crop Science Journal - Vol 16, No 4 (2008)

    African Journals Online (AJOL)

    Meiotic behaviour of Eragrostis tef and,i> Eragrostis Pilosa · EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT. S Admas, K Dagne. http://dx.doi.org/10.4314/acsj.v16i4.54396 ...

  9. Problematic economic environment, landscape characterization for relief in an area of ​​the Pampa Loesica plana, pozo del Molle, Cordoba, Argentina

    International Nuclear Information System (INIS)

    Mansilla, L del V.; Karlsson, A.

    2010-01-01

    This research work was made in Argentina, province of Córdoba, near Pozo del Molle. Located East of the plain of Córdoba, in the geomorphological unit Pampean Loessic Plain. The landscape of this area is made of flat media rises framed by elongated depressions oriented mainly to the SW - NE y NW - SE, in which intersection flooded low-lying area are generated temporally. The human impact, together with the climate changes, mainly the increase in precipitations, affects the economic-environmental problems of the area. The elongated depressions are considered, globally, a problem, because of the soil erosion, in these depression, the agricultural production is reduced. Because of de complexity of the landscape, it was made different searches of topographical parameters, density of low-lying areas and soil variation. With all final results, the economic-environmental units was identified, usefull to make tax relief procedures, and for relate these variations with the soil productivity

  10. Producción y desarrollo de nueve variedades de naranja Citrus sinensis (L. Osbeck en la zona plana del Valle del Cauca

    Directory of Open Access Journals (Sweden)

    Salazar C. Raúl

    1990-12-01

    Full Text Available En árboles de naranja de cinco años injertados sobre mandarina Cleopatra, se evaluaron nueve variedades sembradas en un diseño experimental de bloques completos al azar. El crecimiento de los frutos presentó las tres fases típicas, con duración variable dependiendo de la variedad: lento, crecimiento acelerado y estabilización. Los máximos crecimientos se obtuvieron en las variedades Old Vini, Valencia y Valle Washington. En todas las variedades los sólidos solubles disminuyeron y el porcentaje de acidez aumentó hasta ciertos límites con la edad del fruto. Considerando como momento óptimo para iniciar la cosecha una relación de sólidos solubles: acidez de 9.5:1, la más temprana fue la Valle Washington (7.5 meses, intermedias Old Vini y Australia Navel y la más tardía García Valencia. Todas las variedades presentaron contenidos de jugo mayores del 50 % Y color atractivo de la pulpa. El color más atractivo de la corteza se obtuvo en Parson Brown (97.5 % amarillo, las otras variedades fluctuaron entre 48 y 79%. Todas las variedades tuvieron menos de seis semillas por fruto. Se presentaron dos épocas de cosecha y las variedades con mayor producción: Hamlin, García Valencia y Pineapple tuvieron la mayor variación mensual. La mejor alternativa sembrando 90% de variedades para industria y 10 % para mesa se obtuvo con las variedades Pineapple, Hamlin, Parson Brown, Valle Washington y Old Vini.Five years old orange trees, were grafted on Cleopatra scions of nine cultivars planted in a completely randomized block design were evaluated. Fruit growths presented three typical phases of variable lenght, depending on the cultivar: slow , rapid and stable growth rates. Largest growth were observed in the old Vini, Valencia and Valle Washington cultivars. In all cases total soluble solid contents and acidity increased, up to certain point, with fruit age. Considering that the optimum time to iniciate cropping is when the relationship between solids and acidity is 9.5: 1, the earlient cultivar is Valle Washington (7.5 months while the old Vini and Australian Navel are intermediate and Garcia Valencia is late. All cultivars had solid content above 50% and attractive pulp color. Most attractive rind color was found in the Parson Brown (97.s yellow, the rest fluctuated between 48 and 79%, All cultivars had less than six seeds per fruit, There were two cropping seasons. Largest producers (Hamlin, Garda Valencia and Pineapple had the largest monthy variation, marketing 90 % for industrial purposes and 10% for as fresh product the best cultivars were Pineapple, Hamlin, Parson Brown, Valle Washington and old Vini.

  11. Estudi de la contaminació atmosférica de la plana del Camp de Tarragona (Catalunya prenent els líquens com a bioindicadors

    Directory of Open Access Journals (Sweden)

    Giralt, Mireia

    1997-12-01

    Full Text Available [es] Se evalúa la contaminación atmosférica de la llanura litoral del Camp de Tarragona (Cataluña tomando como bioindicadores los líquenes epífitos del algarrobo (Ceratonia siliqua . Se caracterizan ochenta y cinco estaciones según diversos parámetros: índice de pureza atmosférica (IPA, recubrimiento medio global (RMG y nombre de especies. La combinación de los datos obtenidos permite dividir el área estudiada en seis zonas de isocontaminación . Por otra parte, se clasifican 15 especies de líquenes y el alga Pleurococcus en función de su resistencia a la contaminación atmosférica. [fr] La pollution atmosphérique d'une partie du littoral méditerranéen Catalan (Camp de Tarragona, Catalogne, Espagne a été estimée en utilisant les lichens épiphytes corticoles du caroubier (Ceratonia siliqua comme bioindicateurs. Quatre-vingt cinq stations on été étudiées el caractérisées par le calcul de divers paramètres. En combinant les données fournies par I'lndex de Pureté de l'Air (lPA, le recouvrement moyen global (RMG et le nombre d'espèces. l'aire étudiée est divisée en six zones d' isopollution. Par ailleurs, 15 espèces de lichens et une algue (Pleurococcus sont classées en fonction de leur résistance a la pollution atmosphérique.

  12. Optimizing the structure and function of the 50-plus radiology organizations, part 2: a unified strategic plan-a summary of the 2011 Intersociety Conference.

    Science.gov (United States)

    Dodd, Gerald D

    2012-05-01

    The member organizations of the Intersociety Conference have agreed that radiology would benefit from consolidation and collaboration of the 50-plus radiology organizations. At this year's annual meeting, the participants concluded that the educational and research missions of the organizations would benefit from the creation of a unified strategic plan that addressed the coordination of annual meetings, online educational materials, research infrastructure, and the creation of a direct relationship between the research initiatives of the organizations and the patient advocacy groups of the Academy of Radiology Research. The socioeconomic mission of the organizations would be enhanced through the creation of a formal communication network with the ACR, and certification could be enhanced by the orchestration of the creation of educational materials related to the maintenance of certification. Copyright © 2012 American College of Radiology. Published by Elsevier Inc. All rights reserved.

  13. Arrevistamiento en el diseño de primeras planas de un diario generalista español. Las portadas del diario Público

    Directory of Open Access Journals (Sweden)

    César Mejía Chiang

    2017-11-01

    Full Text Available El presente artículo detalla las temáticas abordadas, así como la estilística y el lenguaje gráfico desplegado en las portadas de la versión impresa del diario Público (octubre 2007 - junio 2008. Sostenemos que el carácter “arrevistado” de las portadas durante el mencionado período no sólo explotaron una serie de recursos visuales (propios de publicaciones orientadas a una lectoría joven, familiarizada con las nuevas tecnologías portátiles y multimedia, sino que ayudaron a canalizar una sistemática crítica hacia los sectores políticos, aparentemente “conservadores” de España, ensalzándose así la raigambre “progresista” del diario.

  14. Validating a mathematical model for inverse osmosis in an experimental flat membrane plant; Validacion de un modelo matematico para osmosis inversa con una planta piloto de membranas planas

    Energy Technology Data Exchange (ETDEWEB)

    Gomez Gotor, A.; Salama, B.; Argudo, C.

    1999-05-01

    The different theories regarding inverse osmosis have given rise to mathematical models. This article describes an experiment using the model developed by Slater et al. based on the solution-diffusion theory. A DOW DANMARK SEPARATION SYSTEMS OI LAB-UNIT M 20 was employed together with a pair of type HR 98 PP flat membranes also from DOW DANMARK A/S SEPARATION SYSTEMS. The solution used to study the operational variables was KCI. The findings in regard to volumetric flows and permeate concentrations conformed to the expected trends. The model`s constants were also determined and their predictive value verified. (Author) 9 refs.

  15. Estudio teórico y experimental de un prototipo de invernadero basado en una estructura resistente plana, ligera, elástica y altamente deformable

    Directory of Open Access Journals (Sweden)

    de la Cruz, José L.

    1996-08-01

    Full Text Available El creciente empleo de estructuras ligeras, tanto en invernaderos en países de clima templado, como, más recientemente, en arquitectura textil para instalaciones de recreo, justifica el desarrollo de este tipo de estructuras. El objeto del presente trabajo es contribuir con un nuevo modelo de estructura de cubierta ligera y flexible, aportando un modelo teórico que se presenta, tras su validación con datos experimentales obtenidos sobre un prototipo, como una metodología adecuada para el cálculo de dicha estructura. La obtención de conclusiones sobre el comportamiento estructural y el estudio de costes realizado sobre el prototipo permiten, dada su viabilidad técnica y económica, proponerlo como una solución alternativa a los invernaderos tradicionales.

    El creciente empleo de estructuras ligeras, tanto en invernaderos en países de clima templado, como, más recientemente, en arquitectura textil para instalaciones de recreo, justifica el desarrollo de este tipo de estructuras. El objeto del presente trabajo es contribuir con un nuevo modelo de estructura de cubierta ligera y flexible, aportando un modelo teórico que se presenta, tras su validación con datos experimentales obtenidos sobre un prototipo, como una metodología adecuada para el cálculo de dicha estructura. La obtención de conclusiones sobre el comportamiento estructural y el estudio de costes realizado sobre el prototipo permiten, dada su viabilidad técnica y económica, proponerlo como una solución alternativa a los invernaderos tradicionales.

  16. Effect of internal limiting membrane peeling on the development of epiretinal membrane after pars plana vitrectomy for primary rhegmatogenous retinal detachment.

    Science.gov (United States)

    Nam, Ki Yup; Kim, Jung Yeul

    2015-05-01

    To investigate the difference in the occurrence of postoperative epiretinal membranes (ERMs) in vitrectomy for rhegmatogenous retinal detachment with and without peeling of the internal limiting membrane (ILM). The medical records of the 135 patients, who underwent vitrectomy for primary rhegmatogenous retinal detachment from November 2007 to August 2011, were analyzed retrospectively. Of the subjects, 70 patients underwent ILM peeling during the surgery and 65 did not. The best-corrected visual acuity, fundus photograph, and optical coherence tomography were collected 3, 6, and 12 months postoperatively. The relationship between ILM peeling and the preoperative findings of rhegmatogenous retinal detachment and development of a postoperative ERM was analyzed. No ERM occurred in the ILM peeling group, whereas an ERM occurred in 14 of 65 patients who underwent vitrectomy without ILM peeling (21.5%). This difference was significant (P peeling group and was significantly higher 12 months postoperatively (P = 0.03). Internal limiting membrane peeling seems to prevent the occurrence of a postoperative ERM in patients with primary rhegmatogenous retinal detachment.

  17. Functional and Morphological Correlations before and after Video-Documented 23-Gauge Pars Plana Vitrectomy with Membrane and ILM Peeling in Patients with Macular Pucker.

    Science.gov (United States)

    Mayer, Wolfgang J; Fazekas, Clara; Schumann, Ricarda; Wolf, Armin; Compera, Denise; Kampik, Anselm; Haritoglou, Christos

    2015-01-01

    Purpose. To assess functional and morphological alterations following video-documented surgery for epiretinal membranes. Methods. Forty-two patients underwent video-documented 23-gauge vitrectomy with peeling of epiretinal (ERM) and inner limiting membrane (ILM). Patient assessment was performed before and 3 and 6 months including best corrected visual acuity (BCVA), slit lamp biomicroscopy, SD-OCT, and central 2° and 18° microperimetry. In addition, all video-documented areas of peeling on the retinal surface were evaluated postoperatively using an additional focal 2° microperimetry. Retinal sensitivity and BCVA were correlated with morphological changes (EZ and ELM) in the foveal region and in regions of membrane peeling. Results. Overall, BCVA increased from 0.6 (±0.2) to 0.2 (±0.2) logMAR after 6 months with an increase in retinal sensitivity (17.9 ± 2.7 dB to 26.8 ± 3.1 dB, p peeling areas (p peeling and overall retinal sensitivity regarding visual acuity gain could be observed after 6 months (p > 0.05). In contrast, overall postoperative retinal sensitivity was significantly decreased in patients with a visual acuity gain lower than 2 lines (p peeling due to the use of intraocular forceps may affect the outer retinal structure. Nevertheless, these changes seem to have no significant impact on postoperative functional outcome.

  18. ·: ORIGINAL ARTICLES

    African Journals Online (AJOL)

    this figure is low compared with figures from other studies in .... a long summer period, high temperatures and wind are major factors contributing to the production of ..... Eragrostis grasses. Values shown are mean cpm of triplicate wells as.

  19. Municipal sludge as source of nitrogen and phosphorus in perennial ...

    African Journals Online (AJOL)

    2013-07-11

    Jul 11, 2013 ... arranged in a complete block design comprising 4 replications of 4 treatments planted to Eragrostis curvula. ... cially when they enter the food chain. For these reasons ...... Department of Ecology, Seattle, WA. HUANG XL ...

  20. The influence of roughage on the digestibility of whole maize grain ...

    African Journals Online (AJOL)

    as fed' basis) 25 rnm-hammermilled Eragrostis curvula hay throughout the experimental period. All animals were fed twice daily. Faeces were collected from the floor. The bulked ... to their mean individual free choice daily intake ('as fed' basis).

  1. National Register Testing of 42 Prehistoric Archeological Sites on Fort Hood, Texas: The 1996 Season

    Science.gov (United States)

    1999-12-01

    the mussel shells belong to the family Unionidae, but no attempt to identify genus or species was made. At least nine different genera of mussels...ornaments or tools. Four of the modified shells are identifiable to genus : two are cf. Lampsilis sp. (one from 41CV578 and one from 41CV1250), one is... Diospyros texana Eragrostis intermedia Eragrostis trichodes Erigeron tenuis Erioneuron pilosum Erodium texanum Euphorbia roemeriana Evax

  2. Calculation of conversion coefficients of dose of a computational anthropomorphic simulator sit exposed to a plane source; Calculo de coeficientes de conversao de dose de um simulador antropomorfico computacional sentado exposto a uma fonte plana

    Energy Technology Data Exchange (ETDEWEB)

    Santos, William S.; Carvalho Junior, Alberico B. de; Pereira, Ariana J.S.; Santos, Marcos S.; Maia, Ana F., E-mail: williathan@yahoo.com.b, E-mail: ablohem@gmail.co, E-mail: ariana-jsp@hotmail.co, E-mail: m_souzasantos@hotmail.co, E-mail: afmaia@ufs.b [Universidade Federal de Sergipe (UFS), Aracaju, SE (Brazil)

    2011-10-26

    In this paper conversion coefficients (CCs) of equivalent dose and effective in terms of kerma in the air were calculated suggested by the ICRP 74. These dose coefficients were calculated considering a plane radiation source and monoenergetic for a spectrum of energy varying from 10 keV to 2 MeV. The CCs were obtained for four geometries of irradiation, anterior-posterior, posterior-anterior, lateral right side and lateral left side. It was used the radiation transport code Visual Monte Carlo (VMC), and a anthropomorphic simulator of sit female voxel. The observed differences in the found values for the CCs at the four irradiation sceneries are direct results of the body organs disposition, and the distance of these organs to the irradiation source. The obtained CCs will be used for estimative more precise of dose in situations that the exposed individual be sit, as the normally the CCs available in the literature were calculated by using simulators always lying or on their feet

  3. Desarrollo de una metodología para el estudio de las inundaciones causadas por encharcamiento de agua de lluvia en zonas urbanas relativamente planas. Area de estudio: Montería (Colombia

    Directory of Open Access Journals (Sweden)

    Padilla Agamez, Manuel

    2015-06-01

    Full Text Available In this paper a methodology for the analysis of the relationship between rainfall and flooding caused by ponding of rainfall water in urban area of Monteria (Colombia is developed. Rainfall water excesses over the soil were estimated from field measurements of the soil infiltration capacity for different soil units of the studied zone. The results obtained are presented in form of statistical correlations for calculating water rainfall excesses over the soils and maps of susceptibility and vulnerability for floods. The maps were used for a brief socioeconomic discussion of the effects of flood events in the selected zone.En el presente trabajo se desarrolla una metodología para el análisis de la relación existente entre las precipitaciones y las inundaciones causadas por encharcamiento de agua de lluvia en la zona urbana de Montería (Colombia. Se realizaron mediciones en campo de la capacidad de infiltración de agua para diferentes unidades de suelos de la zona de estudio, con el fin de estimar los excesos de agua de lluvia sobre el suelo. Los resultados obtenidos se presentan en forma de correlaciones estadísticas para el cálculo de los excesos de agua de lluvia y mapas de susceptibilidad y vulnerabilidad a las inundaciones, mediante los cuales se hace una breve discusión socioeconómica de los efectos de esta clase de inundaciones en la zona de estudio. [fr] Dans le présent travail est analysé la relation existant entre les précipitations et des inondations par accumulation d eau pluie sur le sol dans la zone urbaine de Montería (Colombie. Avec la réalisation de mesures en champ de la capacité d’infiltration pour différents unities de sol de la zone d’étude, on a estimé les excès d’eau pluie sur le sol. Les résultats obtenus sont présentés sous la forme de corrélations statistiques pour le calcul des excès d’eau pluie et de cartes de susceptibilité et vulnérabilité aux inondations. Les cartes ont été employée pour une brève discussion socio-économique des effets des inondations dans la zone d’étude sélectionnée.

  4. Optimization of the biological process using flat membrane bioreactors. Maximum treatment performance with minimum reactor volume; Optimizacion del proceso biologico con BRM de membrana plana. Maximo rendimiento de depuracion con minimo volumen de reactor

    Energy Technology Data Exchange (ETDEWEB)

    Lluch Vallmithana, S.; Lopez Gavin, A.

    2006-07-01

    In a conventional activated sludge process, the membranes are inside the biological reactor where they drain the water through suction or a water column. This system can be operated with heavy loads and sludge of 12-14 g/l or more, and is not affected by problems of bulking or foaming. This makes it suitable for treating difficult industrial waste waters, providing treated water that is free of bacteria and viruses. Micro filtration membranes are flat without any rubbing between them. The membranes require infrequent chemical cleaning and do not need back washing. As no final sedimented is needed, the waste water treatment plant occupies less space. (Author)

  5. Simulación numérica del comportamiento elástico del concreto reforzado con fibras cortas de acero en condición plana de esfuerzos

    Directory of Open Access Journals (Sweden)

    Fabian Lamus

    2011-01-01

    Full Text Available Este trabajo describe un modelo numérico implementado en el método de los elementos finitos (Hughes, 2000, el cual permite simular el comportamiento elástico del concreto reforzado con fibras cortas de dirección aleatoria. En estructuras hechas de dicho material cada punto está compuesto por fibras cortas de acero embebidas en una matriz de concreto simple. En el interior de un elemento finito el concreto reforzado se representa como un material ortótropo de dirección material aleatoria, basado en el modelo de fibras con diámetro despreciable (Dvorak y Bahei-el-Din, 1982 y la teoría de mezclas modificada para refuerzo de corta longitud (Oller, 2003. El análisis estadístico realizado consiste en: repetir la simulación numérica del problema cambiando la dirección de las fibras mediante una función aleatoria, construir la base de datos de muestreo a partir de los resultados obtenidos y medir la dispersión de estos últimos. A continuación, en este trabajo se estudia la sensibilidad del tamaño de los elementos finitos y del número de datos de muestreo en el cálculo de la energía total de deformación y se establecen algunos valores recomendables. Como ejemplo de aplicación se obtuvo la respuesta estructural promedio de una viga de concreto reforzado con diferentes cuantías de fibras cortas de acero, observando una dispersión mínima de los datos.

  6. Rediseño y puesta en marcha de una máquina rectificadora de superficies planas para la planta de producción de la empresa rectificadora Pazmiño S.A.

    OpenAIRE

    Buñay Velasco, Elías David; Pazmiño Flores, Diego Rodrigo

    2012-01-01

    La Rectificadora Pazmiño S.A. es una empresa industrial-automotriz fundada en 1980 dedicada principalmente a la rectificación de partes de motores de combustión interna, comercialización de repuestos de motores a diesel y gasolina y recuperación por metalización de partes y piezas de equipos petroleros e industriales. Desde su fundación Rectificadora Pazmiño ha tenido un crecimiento sostenido y en los últimos 18 años se ha convertido en uno de los principales protagonistas del mercado ecua...

  7. Formulação analítica de um elemento de barra para o cálculo elastoplástico de estruturas de aço porticadas planas

    OpenAIRE

    Baptista, A. M.; Muzeau, J. P.

    2007-01-01

    O presente trabalho apresenta as bases do desenvolvimento de um modelo analítico para o cálculo dos deslocamentos (rotação, flecha e deslocamento axial) numa secção transversal qualquer de uma viga de aço submetida a uma força axial constante e a um momento flector em cada uma das suas extremidades. Entre outras aplicações, este modelo permite efectuar o cálculo directo dos deslocamentos nodais no referencial local de um elemento de viga inserido numa estrutura, em regime elástico ou elastopl...

  8. Análise estática não linear plana de pontes estaiadas e determinação das frequências naturais e modos de vibração

    OpenAIRE

    Carlos Augusto Moreira Filho

    2014-01-01

    As pontes estaiadas são exemplos de estruturas esbeltas e flexíveis onde a capacidade de utilização dos materiais tem grande importância. Neste sentido, para garantir a melhor utilização dos materiais envolvidos (aço e concreto, por exemplo), é preciso determinar as forças de protensão aplicadas aos cabos. A melhor distribuição dos momentos fletores no tabuleiro de ponte é aquela obtida com uma viga contínua. Pontes estaiadas fornecem apoios elásticos ao tabuleiro. O presente trabalho emprega...

  9. Response to elevated CO 2 from a natural spring in a C 4 ...

    African Journals Online (AJOL)

    Eragrostis racemosa (C4), a slow grower, showed no significant responses to high CO2 during the late season. CO2-responsiveness in the field generally followed the seasonal phenologies of each species, being greatest during the most active growth period. Keywords: climate change; gas exchange; photosynthetic ...

  10. Effect of Leucaena and Sesbania supplementation on body growth and scrotal circumference of Ethiopian highland sheep and goats fed teff straw basal diet

    NARCIS (Netherlands)

    Kaitho, R.J.; Tegegne, A.; Umunna, N.N.; Nsahlai, I.V.; Tamminga, S.; Bruchem, J. van; Arts, J.M.

    1998-01-01

    The long term effect of supplementation of Leucaena pallida and Sesbania sesban on growth and reproduction performance was determined on 30 male Ethiopian highland sheep and 25 East African goats. Unchopped teff straw (Eragrostis tef) was given ad libitum and supplemented with either wheat bran (150

  11. Improvement of Injera shelf life through the use of chemical ...

    African Journals Online (AJOL)

    Mould spoilage is a serious problem that affects the shelf life of injera, the staple Ethiopian fermented bread. Injera is made from teff (Eragrostis tef) but other cereals may also be used in combination with teff. About two-third of Ethiopian diet consists of injera and it accounts for about two-thirds of the daily protein intake of the ...

  12. Allelopathy in agroforestry systems: the effects of leaf extracts ofCupressus lusitanica and threeEucalyptus spp. on four Ethiopian crops

    DEFF Research Database (Denmark)

    Lisanework N.; Michelsen, Anders

    1993-01-01

    The potential allelopathic effect ofCupressus lusitanica, Eucalyptus globulus, E. camaldulensis andE. saligna on seed germination, radicle and seedling growth was investigated with four crops:Cicer arietinum (chickpea),Zea mays (maize),Pisum sativum (pea) andEragrostis tef (teff). Aqueous leaf ex...

  13. Shoot and root biomass allocation and competitive hierarchies of ...

    African Journals Online (AJOL)

    Shoot and root biomass allocation and competitive hierarchies of four South African grass species on light, soil resources and cutting gradients. ... Aristida junciformis, produced nearly double the biomass of taller species such as Hyparrhenia hirta and Eragrostis curvula in the low-nutrient treatments, with the reverse being ...

  14. FOLIAR EPIDERMAL AND PHYTOCHEMICAL STUDIES OF THE ...

    African Journals Online (AJOL)

    Administrator

    alkaloid, saponin, inulin, cellulose, tannin and lignin; Eragrostis tremula tested negative for lignin and positive for cellulose, saponin and alkaloids while Axonopus compressus tested negative for lignin, but positive for alkaloid, saponin, inulin, cellulose and tannin respectively. Leaf epidermal studies help to determine ...

  15. Trophic ecology of Lepidoptera larvae associated with woody vegetation in a savanna ecosystem

    CSIR Research Space (South Africa)

    Scholtz, CH

    1982-06-01

    Full Text Available This study represents a quantitative survey of a Lepidoptera community and deals with the trophic ecology of the 27 species of foliage-feeding Lepidoptera on the eight dominant woody plants in the Burkea africana-Eragrostis pallens savanna...

  16. SOMATIC EMBRYOGENESIS AND PLANT REGENERATION FROM ...

    African Journals Online (AJOL)

    Prof. Adipala Ekwamu

    2012-08-29

    Aug 29, 2012 ... An in vitro embryo rescue culture technique has been developed for F1 hybridsof Eragrostis tef with ... straw over straw of other cereals, and its quality ..... bread wheat. Maximum calli were induced in 4.5. µM 2,4-D (Sears and Deckard, 1982). From a total of 635 cultured pollinated florets of F1 hybrids, 21 ...

  17. The effect of winter burning and mowing on seasonal herbage yield ...

    African Journals Online (AJOL)

    The response of Eragrostis curvula cv. Ermelo to three levels of fertilizer (no nitrogen or phosphorus; 53 kg nitrogen + 16 kg phosphorus per ha; and 106 kg nitrogen + 32 kg phosphorus per ha), three times of removing unutilized herbage (July, August and September) and three methods of herbage removal (annual mowing ...

  18. Cyperus surinamensis Rottb., A Newly Naturalized Sedge Species in Taiwan

    Directory of Open Access Journals (Sweden)

    Shih-Huei Chen

    2009-11-01

    Full Text Available Cyperus surinamensis Rottb., a sedge species of tropical and subtropical American origins, has recently been naturalized in the northern part of Taiwan. The present study provides taxonomic description, line drawings and other relevant information. In addition, a comparison with similar species C. eragrostis Lam. is given.

  19. The farm household model based on Lexicographic utilities

    African Journals Online (AJOL)

    Yigezu A. Yigezu

    2012-08-05

    Aug 5, 2012 ... fill in gaps in the data collected from the sample households and community surveys. Besides the ... Teff (Eragrostis tef), sorghum, maize and ... In the literature, sorghum yield losses due to Striga range from 40-100% [15]. For.

  20. Biomass and leaf-level gas exchange characteristics of three African savanna C4 grass species under optimum growth conditions

    NARCIS (Netherlands)

    Mantlana, K.B.; Veenendaal, E.M.; Arneth, A.; Grispen, V.; Bonyongo, C.M.; Heitkönig, I.M.A.; Lloyd, J.

    2009-01-01

    C4 savanna grass species, Digitaria eriantha, Eragrostis lehmanniana and Panicum repens, were grown under optimum growth conditions with the aim of characterizing their above- and below-ground biomass allocation and the response of their gas exchange to changes in light intensity, CO2 concentration

  1. Diversity and Plant Growth Promoting Proerties of Rhizobacteria ...

    African Journals Online (AJOL)

    The purpose of this study was to evaluate and assess the plant growth promoting characteristics and diversity of major tef rhizosphere isolates from central Ethiopia. A total of 162 bacteria were isolated from rhizosphere of tef [Eragrostis tef (Zucc.) Trotter] and characterized. While screening using some plant growth ...

  2. African Journal of Biotechnology - Vol 8, No 22 (2009)

    African Journals Online (AJOL)

    A comparison of soda and soda-AQ pulps from cotton stalks · EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT ... Effects of sowing date and nutsedge removal time on plant growth and yield of tef [Eragrostis tef (Zucc.) Trotter] ... Effect of plant growth regulators on in vitro shoot multiplication of Amygdalus communis L. cv.

  3. A new agro-climatic classification for crop suitability zoning in northern semi-arid Ethiopia

    NARCIS (Netherlands)

    Araya, A.; Keesstra, S.D.; Stroosnijder, L.

    2010-01-01

    The agro-climatic resources of Giba catchment in northern Ethiopia were assessed and characterized. The objectives were (i) to ascertain the suitability of the climate for growing teff (Eragrostis tef) and barley (Hordeum vulgare); (ii) to determine the onset and length of the growing period (LGP),

  4. Establishing vegetation on Kimberlite mine tailings: 2. Field trials. | N ...

    African Journals Online (AJOL)

    A series of field experiments were carried out on Kimberlite mine tailing located at Cullinan in the Transvaal. The most successful species in pure sward were Chloris gayana, Cynodon aethiopicus, Eragrostis curvula, E. tef, Pennisetum purpureum, Melilotus alban and Medicago sativa. Growth of grasses in the absence of ...

  5. Development of lignin in Themeda triandra, Cymbopogon plurinodis ...

    African Journals Online (AJOL)

    The amount and distribution of lignin in three grass species was determined. Two climax species, Themeda triandra and Cymbopogon plurinodis and one pioneer species, Eragrostis lehmanniana were used in the investigation. Leaf samples of the three grass species were taken at four stages of growth and samples of the ...

  6. Recommended Species for Vegetative Stabilization of Training Lands in Arid and Semi-Arid Environments

    Science.gov (United States)

    1985-09-01

    bitterbrush Purshia glandulosa Apache plume Fallugia paradoxa Arizona fesce Festuca arizonica Ashe juniper Juniperus ashei Australian saltbush Atriplex...elm Ulmus crassifolia *Cheatgrass Bromus tectorum -Chinkapin oak Quercus muhlenbergii Cholla Opuntia, spp. * Cicer milkvetch Astragalus cicer Clovers...Linum lewisii Little bluestem Schizachyrium scoparium *Littleleaf palo verde Cercidium microphyllum *Live oak Quercus virginiana Lovegrasses Eragrostis

  7. Smallholders' soil fertility management in the Central Highlands of Ethiopia: implications for nutrient stocks, balances and sustainability of agroecosystems

    NARCIS (Netherlands)

    Haileslassie, A.; Priess, J.A.; Veldkamp, E.; Lesschen, J.P.

    2006-01-01

    Low agricultural productivity caused by soil degradation is a serious problem in the Ethiopian Highlands. Here, we report how differences in soil fertility management between farming systems, based either on enset (Ensete ventricosum) or on teff (Eragrostis tef) as the major crops, affect the extent

  8. National Wetland Plant List Indicator Rating Definitions

    Science.gov (United States)

    2012-07-01

    glaucus (blue rye grass), Eragrostis pilosa (Indian love grass), Oenothera biennis (king’s-cureall), Ostrya virginiana (eastern hop-hornbeam...profile with a low wa- ter-holding capacity. ERDC/CRREL TN-12-1 6 Prunus serotina (black cherry), Phleum pretense (common timothy), Sarcobatus

  9. Cultural Resources Reconnaissance Study of the Black Warrior-Tombigbee System Corridor, Alabama. Volume 1. Archaeology.

    Science.gov (United States)

    1983-01-01

    rigidulum and P. dichotomi- florum, goose grass ( Eleusine indica ), the love grass (Eragrostis glome- rata), and red-root sedge (Cyperus erythrorhizos...type, Weeden Island Incised, is considered to be an indica - tion of late Porter. This assumption is apparently supported by the dated assemblage at Site

  10. Test Area B-75 Final Range Environmental Assessment (REA), Revision 1

    Science.gov (United States)

    2010-08-01

    impacts to Eglin ecosystems. Some of the main invasive non-native species of concern are Chinese tallow, cogon grass , Japanese climbing fern...lotor Saw Grass Cladium jamaicensis Florida Black Bear Ursus americanus floridanus Cattail Typha domingensis Sherman’s Fox Squirrel Sciuris niger...Cont’d Yellow Indian Grass Sorghastrum nutans Flycatchers Tyrannidae spp. Purple Lovegrass Eragrostis spectabilis Cotton Mouse Peromyscus gossypinus

  11. Fuel location, homogeneity and amount in flat and tubular configurations; Repartition, Homogeneite et Quantite du Combustible dans les Elements a Configuration Plate ou Tubulaire; Polozhenie, gomogennost' i kolichestvo topliva v ploskikh i trubchatykh konfiguratsiyakh; Disposicion, Homogeneidad y Cantidad de Combustibles en Configuraciones Planas y Tubulares

    Energy Technology Data Exchange (ETDEWEB)

    Meester, P. de [Studiecentrum voor Kernenergie, Mol (Belgium)

    1965-10-15

    The fuel elements tor tne materials testing reactor BR-2 can be assembled either with plates obtained by the picture-frame process, or with tubes obtained by co-extrusion. In the course of the fabrication and before reactor loading the fuel disposition, the homogeneity and the absolute amount have to be checked or measured. The fuel disposition should be known for positioning of the core in plates and tubes and as a first quality evaluation of the product with regard to the geometrical specifications. Radiography at about 80-90 keV, autoradiography and gammagraphy with a thulium-170 source have been done. By radiographing the fuel tubes a lead mandrel with the X-ray film fixed to it was placed inside the tube and subsequent X-ray shots at different angles were taken. A radioactive source scanning the fuel tube along its centre line in combination with a film around the tube showed records with a high resolution. The fuel homogeneity is to be controlled in view of a safe reactor operation, i. e. on the one hand to avoid exaggerated fuel concentrations that could give rise to vapour formation in the operating PWR, and on the other hand to guarantee a sufficient and evenly spread fuel load. Radiographs can be used for a visual check. However, if a quantitative analysis is needed, a better device is a scintillation gamma spectrometer measuring the proper radiation emitted by the U{sup 235}. An analysis of the results on some 400 fuel plates and on a first batch of fuel tubes is given. Forming characteristics and typical end-forms can be controlled. Absorption measurements with an activated source gave less good results. Digital results from static measurements and continuous recording are discussed. The fuel amount as an absolute quantity should be known per zone for actual reactor-operation calculations and per complete element for reasons of fuel accounting and for comparison with post-irradiation bum-up evaluation. The fabrication and the use of the different standards are considered. Accuracy and elimination of errors are discussed. Some possible future improvements in the tests are proposed. (author) [French] Les elements combustibles pour le reacteur d'essai de materiaux BR-2 peuvent etre-realises, soit avec des plaques obtenues par cadrages, soit avec des tubes obtenus par coextrusion. Au cours de la fabrication et avant le chargement dans le reacteur, il faut verifier ou mesurer la repartition, l'homogeneite et la quantite du combustible. Il faut connaitre la repartition du combustible pour le positionnement de l'ame dans les plaques et tubes ainsi que pour une premiere evaluation qualitative du produit du point de vue des specifications geometriques. On a procede a des radiographies 3 80-90 keV, ainsi qu'a des autoradiographies et gammagraphies avec une source au thulium-170. Pour l'examen radiographique des tubes de combustible, on a introduit dans le tube un mandrin en plomb auquel etait fixe un film sensible aux rayons X , puis on a fait des radiographies sous divers angles. En utilisant une source radioactive se deplacant le long de l'axe du tube et un film place autour du tube, on a obtenu des enregistrements avec un tres bon contraste. Il faut controler l'homogeneite du combustible pour assurer la securite du fonctionnement du reacteur, c'est-a-dire pour eviter toute concentration excessive de combustible pouvant donner lieu a des formations de vapeur pendant le fonctionnement du reacteur et pour garantir que le chargement de combustible est suffisant et regulierement reparti. On peut faire appel a des radiographies en vue d'une verification visuelle. Cependant, s'il est necessaire de faire une analyse quantitative, il est preferable d'utiliser un spectrometre g a m m a a scintillation permettant de mesurer le rayonnement propre emis par l'uranium-235. Le memoire contient une' analyse des resultats obtenus pour quelque 400 plaques de combustible et pour un premier lot de tubes de combustible. Il est possible de controler les caracteristiques de deformabilite et les formes finales. La mesure de l'absorption a l'aide d'une source activee donne des resultats moins satisfaisants. L'auteur discute les donnees numeriques obtenues a partir de mesures statiques et d'enregistrements continus Il faut connaitre la quantite absolue de combustible par zone pour le calcul des parametres de fonctionnement du reacteur, et par element pour la comptabilite du combustible ainsi qu'aux fins de comparaison des taux d'irradiation. Le memoire traite de la fabrication et de l'utilisation des divers etalons. Il discute le degre de precision et l'elimination des erreurs. L'auteur propose plusieurs ameliorations des operations de controle. (author) [Spanish] Los elementos combustibles para el reactor de ensayo de materiales BR-2 pueden armarse con placas tipo cuadro, o bien con tubos preparados por coextrusion. En el curso de la elaboracion y antes de cargar el reactor, es nesesario verificar o medir la disposicion, homogeneidad y cantidad absoluta de combustible. La disposicion del combustible debe conocerse para fijar la ubicacion del alma en placas y tubos, y tambien como primera evaluacion de la calidad del producto en lo que atane a las especificaciones sobre su forma geometrica. Se han efectuado inspecciones mediante radiografia a unos 80-90 keV, autorradiograffa y gammagraffa con una fuente de {sup 170}Tm. Para radiografiar los tubos de combustible, se coloco en su interior un mandril de plomo al cual se habfa fijado la pelicula de rayos X y se tomaron luego varias exposiciones desde distintos angulos. Una fuente radiactiva usada para explorar el tubo longitudinalmente, combinada con una pelicula dispuesta alrededor del tubo, permitio obtener registros de elevada resolucion. La homogeneidad del combustible debe controlarse con miras a un foncionamiento seguro del reactor, es decir, se han de evitar por una parte concentraciones excesivas de combustible que podrian producir vapor en el reactor de agua a presion (PWR) en funcionamiento, y por otra parte, garantizar una carga de combustible suficiente y uniformemente distribuida. Como verificacion visual, puede usarse la radiografia. En cambio, si se necesita un analisis cuantitativo conviene emplear un espectrometro de centelleo gamma que mida la radiacion emitida por el {sup 235}U. Se analizan en la memoria los resultados obtenidos con unas 400 placas de combustible y con una primera partida de tubos. Este metodo permite controlar las caracteristicas de Conformacion y los casquetes. Las mediciones de absorcion con una fuente radiactiva no dieron resultados tan satisfactorios. Se analizan en la memoria resultados numericos de mediciones estaticas y de registros continuos. La cantidad absoluta de combustible en cada zona debe conocerse para poder realizar los calculos relativos al funcionamiento del reactor y tambien debe conocerse la cantidad de combustible contenida en casa elemento completo, para poder llevar el control de las existencias de combustible y poder comparar con la evaluacion del grado de combustion realizada despues de la irradiacion. Se considera en la memoria la elaboracion y el uso de distintos elementos patrones. Se analizan el grado de exactitud y la eliminacion de errores. Se proponen algunas mejoras que podrian introducirse en los ensayos,. (author) [Russian] Teplovydelyayushchie ehlementy dlya materialovedcheskogo reaktora BR-2 mozhno montirovat' libo s plastinkami, poluchennymi v rezul'tate protsessa kadro- voj ramki, libo s trubkami, poluchennymi s pomoshch'yu odnovremennogo prodavlivaniya. V pro- tsesse izgotovleniya i do zagruzki reaktora neobkhodimo proverit' ili izmerit' raspolo- zhenie, gomogennost' i absolyutnoe kolichestvo topliva. Raspolozhenie topliva dolzhno byt' izvestno dlya pomeshcheniya serdechnika v plastinakh i trubkakh i dlya pervoj otsenki kachestva produkta v otnoshenii geometricheskikh spetsifikatsij. S pomoshch'yu tuliya-170 byli proizvedeny radiografiya priblizitel'no pri 80-90 kehv, avtoradiografiya i gammagrafiya. Pri radiografii toplivnykh Trubok svintsovuyu oprav- ku s prikreplennoj k nej rentgenovskoj plenkoj pomeshchayut vnutr' trubki. . Zatem pod razlichnymi uglami delayut rentgenovski snimki. Radioaktivnyj istochnik, skenniruyushchij toplivnuyu trubku vdol' ee tsentral'noj linii, v sochetanii s plenkoj vokrug trubki pokazyvaet zapisi, imeyushchie bol'shuyu razreshayushchuyu sposobnost'. Gomogennost' topliva neobkhodimo kontrolirovat' dlya obespecheniya bezopasnoj raboty reaktora, t.e., s odnoj storony, s tsel'yu izbezhat' izbytochnykh kontsentratsij topliva, koto- rye mogut vyzvat' paroobrazovanie pri rabote reaktora, okhlazhdaemogo vodoj pod davleniem, a s drugoj - obespechit' dostatochnuyu i ravnomerno raspredelennuyu toplivnuyu zagruzku. Ra- diografy mozhno ispol'zovat' dlya vizual'noj proverki. Esli neobkhodimo sdelat' kolichest- vennyj analiz, to luchshim priborom yavlyaetsya stsintillyatsionnyj gamma-spektrometr, izmerya- yushchij sobstvennoe izluchenie, kotoroe ispuskaet uran-235. Privoditsya analiz rezul'tatov, svyazannykh priblizitel'no s 400 toplivnymi plastinkami i pervoj partiej toplivnykh tru- bok. Mozhno kontrolirovat' kharakteristiki formirovaniya i tipichnye kontseviki. Rezul'- taty absorbtsionnykh izmerenij s pomoshch'yu aktivirovannogo istochnika yavlyayutsya neskol'ko khudshimi. Rassmatrivayutsya tsifrovye rezul'taty staticheskikh izmerenij i nepreryvnoj zapisi. Dlya raschetov fakticheskoj raboty reaktora dolzhno byt' izvestno kolichestvo top- liva, kak absolyutnoe kolichestvo, na kazhduyu zonu i na kazhdyj polnyj ehlement v tselyakh ucheta topliva i sravneniya s otsenkoj vygoraniya posle oblucheniya. Rassmatrivayutsya izgotovlenie i ispol'zovanie razlichnykh standartov, a takzhe tochnost' i ustranenie pogreshnostej. Predlagayutsya nekotorye uluchsheniya pri provedenii ispytanij v bud. (author)

  12. Composición y distribución espacio-temporal de las comunidades de arañas (Arachnida: Araneae en el sistema de cultivo maíz-soya de la altillanura plana colombiana, municipio de Puerto López, Meta

    Directory of Open Access Journals (Sweden)

    Carlos Andrés Perafán Liévano

    2004-07-01

    sistema. La composición y diversidad de arañas en términos generales no se ve afectada durante las diferentes etapas del sistema de cultivo, pero sí entre los ecosistemas aledaños, los cuales promueven un aumento en la diversidad dentro de los cultivos y además determinan la fauna de arañas que se dispersa hacia estos.

  13. Uma Contribuição ao Estudo do Processo TIG Cold Wire na Posição Plana, Horizontal e Sobrecabeça sob Novos Desenhos de Tocha e Metodologias de Alimentação de Arame

    Directory of Open Access Journals (Sweden)

    Víctor Vergara Díaz

    2015-09-01

    Full Text Available Resumo Esta linha de pesquisa surge para melhorar o atual procedimento na soldagem de tubos de caldeiras, onde são utilizados processos de soldagem manual e a qualidade das uniões soldadas depende exclusivamente da habilidade do soldador. Neste sentido, a proposta consiste em realizar a reparação com um processo de soldagem mais produtivo denominado de TIG cold wire com alimentação mecanizada de arame frio com a intenção de conseguir ganhos em qualidade nas uniões soldadas e repetitividade. Os cordões de solda foram avaliados pelo aspecto superficial, morfologia, grau de diluição e índice de convexidade. Foram realizados ensaios com dois direcionadores de arame (20° e 48° para verificar a influência do ângulo de entrada da injeção de arame no arco. Os resultados indicam um aumento considerável da produtividade do processo TIG com alimentação mecanizada de arame, quando é empregado o direcionador desenvolvido com entrada de arame de 20°, aproximando-se a taxa de deposição daquelas obtidas com o processo MIG/MAG, para um mesmo diâmetro de arame. Foi possível testar duas configurações de alimentação de arame: contínua e pulsada. Os resultados mostraram que a configuração de alimentação pulsada de arame proposta foi aplicada com sucesso em todas as posições garantindo repetitividade, estabilidade do processo e sustentabilidade da poça de fusão.

  14. Hurtado Albir, Amparo. Aprender a Traducir del francés al español. Competencias y tareas para la iniciación a la traducción. Série Aprender a Traducir 6. Castellón de la Plana: Publicacions de la Universitat Jaume I, Madrid: Edelsa, D.L. 2015.

    Directory of Open Access Journals (Sweden)

    Maria Lúcia Vasconcellos

    2015-12-01

    Full Text Available A série Aprender a Traducir, dirigida e editada por Amparo Hurtado Albir,  propõe manuais de uso didático destinados principalmente a estudantes de tradução, incluindo volumes especiais para a aprendizagem de línguas na formação de tradutores (língua materna e línguas estrangeiras, a introdução à tradução em diversas combinações linguísticas, para as diversas especializações da tradução profissional (tradução técnico-científica, jurídica, literária e audiovisual, a introdução à interpretação e disciplinas afins, como, por exemplo, Estudos da Tradução e Informática aplicada à tradução.

  15. Hurtado Albir, Amparo. Aprender a Traducir del francés al español. Competencias y tareas para la iniciación a la traducción. Série Aprender a Traducir 6. Castellón de la Plana: Publicacions de la Universitat Jaume I, Madrid: Edelsa, D.L. 2015.

    Directory of Open Access Journals (Sweden)

    Maria Lúcia Vasconcellos

    2015-12-01

    Full Text Available A série Aprender a Traducir, dirigida e editada por Amparo Hurtado Albir, propõe manuais de uso didático destinados principalmente a estudantes de tradução, incluindo volumes especiais para a aprendizagem de línguas na formação de tradutores (língua materna e línguas estrangeiras, a introdução à tradução em diversas combinações linguísticas, para as diversas especializações da tradução profissional (tradução técnico-científica, jurídica, literária e audiovisual, a introdução à interpretação e disciplinas afins, como, por exemplo, Estudos da Tradução e Informática aplicada à tradução.

  16. Formação de membranas planas celulósicas por espalhamento duplo para os processos de nanofiltração e osmose inversa Membranes for nanofiltration and reverse osmosis prepared by simultaneous casting of two polymer solutions

    Directory of Open Access Journals (Sweden)

    Roberto B. de Carvalho

    2001-06-01

    Full Text Available No presente trabalho é estudado o preparo de membranas anisotrópicas compostas, em uma única etapa, para os processos de NF e OI, através do espalhamento simultâneo de duas soluções poliméricas [acetato de celulose - AC/formamida/acetona (26,3/23,7/50 % p/p e AC/poli(vinil pirrolidona - PVP/N,N-dimetilformamida - DMF (15/10/75 % p/p]. A precipitação das soluções, em água destilada, foi acompanhada por medidas de transmitância de luz. Estudou-se a influência das condições de preparo das membranas, na sua morfologia e nas suas propriedades de transporte (fluxo de permeado e retenção de solutos - Polietilenoglicol (PEG para a NF e NaCl para a OI. Realizou-se também um tratamento térmico nas diferentes membranas produzidas. Os resultados mostraram que é possível obter membranas celulósicas com total aderência das diferentes camadas, a qual pode ser atribuída às condições de transferência de massa que retardam a precipitação na região próxima à interface das soluções espalhadas simultaneamente. Com relação aos testes de OI e NF, as membranas desenvolvidas apresentaram valores de fluxo permeado (7 - 465 L/h.m² dentro da faixa das membranas comerciais, retenção salina (NaCl entre 24-63 % e retenção do PEG entre 53-82 %, mostrando o potencial de aplicação destas membranas.The purpose of this work is to investigate the preparation of composite anisotropic membranes in a single stage, through the technique of simultaneous casting of two polymer solutions (cellulose acetate (CA/acetone/formamide (26.3/50/23.7 % w/w and CA/polyvinylpyrrolidone/dimethyl formamide (15/10/75 % w/w. The precipitation of the solutions was followed using light transmission experiments. The effect of the exposition period precipitation bath on the membrane properties is also reported. All the membranes were characterized by scanning electron microscopy and by permeation experiments. The RO and NF experiments are carried out using 5,000 mug/g (ppm of NaCl aqueous solution and 5 g/L of polyethyleneglycol (PEG, 6 KDa, aqueous solution, respectively. Moreover, to reduce defects in the upper layer, the membranes were immersed in a water bath at 90°C for 60 minutes. The membrane morphology analysis indicates that is possible to obtain complete adhesion of the two layers. This result is related to the mass transfer conditions, which should delay the precipitation in the regions near the polymer solutions interface. Regarding the performance of the membranes in RO and NF experiments, the permeate fluxes are comparable to those observed with commercial membranes (7--465 L/h.m². The solute retention varied in the range of 24 to 63% for NaCl, and in the range of 53 to 82% for PEG. These results point out the potential of technical scale application of the double layer membranes.

  17. The grasses (Poaceae) of the Colombian Guyana: analyses on their composition, richness, endemism, and invasion

    International Nuclear Information System (INIS)

    Giraldo Canas, Diego

    2010-01-01

    The checklist of grasses from Colombian Guyana is presented. In all, 152 species, 69 genera, and six subfamilies were recorded. Thus, in the Colombian Guyana is represented the 18.7 and 43.7% of the species and genera of Colombian grasses, respectively. The subfamilies with the highest number of species were Panicoideae (110 species/46 genera), Chloridoideae (21/9), and Bambusoideae (11/9). The most diverse genera were Paspalum (19 species), Panicum (16), Axonopus (14), Eragrostis (9), and Digitaria (8). Nineteen species are introduced and naturalized in the Colombian Guyana, which represent 12.5% of the agrostological flora for the Colombian Guyana. There were 8 endemic species (5.3% of Colombian Guayanan grasses). In addition, some species are reported for the first time for Colombian flora (belonging to Axonopus, Cyphonanthus, Gymnopogon, and Paspalum), and some species are new to science (belonging to Axonopus, Digitaria, Eragrostis, and Sacciolepis). On the other hand, some preliminary biogeographical aspect are analyzed.

  18. Seedbed preparation influence on morphometric characteristics of perennial grasses of a semi-arid rangeland in Kenya

    OpenAIRE

    Opiyo, Francis EO; Ekaya, Wellington N; Nyariki, Dickson M; Mureithi, Stephen Mwangi

    2011-01-01

    Semi-arid rangelands in Kenya are an important source of forage for both domestic and wild animals. However, indigenous perennial grasses notably Cenchrus ciliaris (African foxtail grass), Eragrostis superba (Maasai love grass) and Enteropogon macrostachyus (Bush rye grass) are disappearing at an alarming rate. Efforts to re-introduce them through restoration programs have often yielded little success. This can partly be attributed to failure of topsoil to capture and store scarce water to me...

  19. The influence of feedback on hay pastures. | N.F.G. | African Journal ...

    African Journals Online (AJOL)

    The feeding of hay to sheep or cattle on an Eragrostis curvula pasture during the winter months has a most beneficial effect on the response of the pasture to fertilization in subsequent seasons. Low rates of feedback (10 t/ha) had an effect for two seasons whilst the effect of 30 t/ha lasted for at least three seasons and was ...

  20. Factors associated with pentosidine accumulation in the human vitreous

    NARCIS (Netherlands)

    Van Deemter, Marielle; Bank, Ruud A.; Vehof, Jelle; Hooymans, Johanna M. M.; Los, Leonoor I.

    Purpose: To explore factors associated with pentosidine accumulation in the human vitreous. Methods: Vitreous samples were obtained during trans pars plana vitrectomy for macular hole or rhegmatogenous retinal detachment. Patient characteristics included age, gender, and diabetes mellitus. Ocular

  1. Considerations in Management of Rhegmatogenous Retinal ...

    African Journals Online (AJOL)

    buckling surgery but Patient B required pars plana vitrectomy with silicon oil tamponade. Best ... Both patients were discharged on topical steroids drops with two hourly .... used, fetal growth retardation monitoring may be considered.[3].

  2. Evaluation of the macular architecture of patients operated on from macula-off rhegmatogenous retinal detachment using optical coherence tomography

    International Nuclear Information System (INIS)

    Ramos Lopez, Meisy; Obret Mendive, Isabel; Hernandez Silva, Juan Raul

    2010-01-01

    With the support of optical coherence tomography, to evaluate the macular condition of the patients operated on from rhegmatogenous retinal detachment, with detached macula, who underwent buckling surgery and pars plana vitrectomy

  3. Evidence of Late Palaeocene-Early Eocene equatorial rain forest ...

    Indian Academy of Sciences (India)

    Prakash

    2009-11-02

    Nov 2, 2009 ... influx of CO2 during early Cenozoic times (Kent and Muttoni. 2008), besides ... Palaeocene – Eocene lignite and coal deposits of India. .... journey of the Indian subcontinent and massive outpouring ..... ice age (Plana 2004).

  4. DISTRIBUTION AND DIVERSITY OF FUSARIUM SPECIES ASSOCIATED WITH GRASSES IN TEN STATES THROUGHOUT PENINSULAR MALAYSIA

    Directory of Open Access Journals (Sweden)

    NUR AIN IZZATI, M.Z

    2009-01-01

    Full Text Available Fusarium is one of the important genera associated with grasses as saprophytes, endophytes and pathogens. A study was carried out on distribution and diversity of Fusarium species associated with two groups of grasses in 10 states throughout Peninsular Malaysia i.e. agricultural grasses (Oryza sativa and Saccharum officinarum and non-agricultural grasses (Axonopus compressus, Centhotheca lappacea, Chloris barbata, Crysopogon aciculatus, Cyanadon dactylon, Dactyloctenium aegyptium, Digitaria ciliaris, Echinochloa colona, Eleusine indica, Eragrostis amabilis, Eragrostis malayana, Eragrostis uniloides, Ischaemum magnum, Panicum brevifolium, Panicum millaneum, Panicum repens, Paspalum commersonii, Paspalum conjugatum, Paspalum orbiculare, Pennisetum purpureum, Sacciolepis indica, Sporobolus diander and Sporobolus indicus. A total of 474 isolates were single-spored and identified by morphological characteristics. F. semitectum was frequently isolated (23.6%, followed by F. sacchari and F. fujikuroi with 15.4% and 14.6%, respectively. The other nine species were F. solani (10.3%, F. proliferatum (8.9%, F. oxysporum (7.4%, F. subglutinans (6.5%, F. equiseti (5.5%, F. verticillioides (3.4%, F. compactum (2.5%, F. chlamydosporum (1.1% and F. longipes (0.8%. Based on the Shannon-Weiner Index, F. solani was the highest (H' = 2.62 isolated from grasses. Species of Fusarium from O. sativa were widely diverse with 11 species, followed by non-agricultural grasses with nine species and S. officinarum with only six species. This is the first report on diversity of Fusarium associated with grasses in Malaysia.

  5. Midline sclerotomy approach for intraocular foreign body removal in phakic eyes using endoilluminator: A novel technique

    Science.gov (United States)

    Ravani, Raghav; Chawla, Rohan; Azad, Shorya Vardhan; Gupta, Yogita; Kumar, Vinod; Kumar, Atul

    2018-01-01

    Purpose: The objective of this study is to describe the removal of retained intraocular foreign body (RIOFB) by bimanual pars plana vitrectomy through midline sclerotomy in phakic patients. Technique: Four eyes with RIOFB and clear lens underwent microincision vitrectomy surgery. A chandelier illumination was placed through one of the existing ports. The foreign body (FB) was localized by direct visualization (intravitreal) or indentation (pars plana), stabilized using an intraocular magnet/FB forceps introduced through a midline sclerotomy and freed of vitreous from all sides using a vitrectomy cutter through the other port bimanually, reoriented along their long axis and extracted through the midline sclerotomy. Results: All four FBs were removed successfully without slippage or damage to the clear lens. Conclusion: Chandelier illumination-assisted removal of FB through midline sclerotomy helps in easier localization, stabilization and removal, avoiding lens touch even in anteriorly located FBs such as at pars plana. PMID:29676316

  6. Massive Silicone Oil Migration into the Subconjunctival Space: A Leakage Mechanism Dilemma

    Directory of Open Access Journals (Sweden)

    Jesús Téllez

    2018-05-01

    Full Text Available Purpose: To report a case in which an early, massive silicone oil migration into the subconjunctival space occurred in a patient after sutureless vitrectomy with the presence of a previously implanted pars plana glaucoma drainage device. Case Report: An 80-year-old man presented with neovascular glaucoma secondary to a proliferative diabetic retinopathy in his left eye. After an intracamerular bevacizumab injection and panretinal photocoagulation, a 23-gauge pars plana vitrectomy (PPV combined with a superotemporal Ahmed pars plana glaucoma valve implantation was performed. Afterwards, the patient underwent a new 23-gauge PPV for a dense vitreous hemorrhage. Intravitreal 1,000 centistokes silicone oil was placed to prevent recurrent intraocular bleeding. No sutures were performed. In the first postoperative month, a massive migration of silicone oil into the 360° subconjunctival space was noted until no intraocular silicone oil was observed. Conclusions: We discuss the possible leakage mechanisms in this particular case.

  7. Vitreolensectomy in Marfan's syndrome.

    Science.gov (United States)

    Hubbard, A D; Charteris, D G; Cooling, R J

    1998-01-01

    To evaluate the effectiveness of pars plana vitreolensectomy in the management of subluxed lenses associated with Marfan's syndrome and to assess the need for intraoperative retinal photocoagulation to prevent post-operative retinal detachment. A retrospective review was carried out of 40 eyes of patients with Marfan's syndrome who underwent pars plana vitreolensectomy for subluxed lenses. All patients demonstrated stable or improved visual acuity following surgery with a low incidence of complications. Pars plana vitreolensectomy is a safe and effective treatment for subluxed lenses in patients with Marfan's syndrome. It appears that intraoperative prophylactic laser treatment need only be applied to areas of lattice degeneration to limit the incidence of post-operative retinal detachment.

  8. Anther and pollen development in some species of Poaceae (Poales Desenvolvimento da antera e do grão de pólen em espécies de Poaceae (Poales

    Directory of Open Access Journals (Sweden)

    AT. Nakamura

    2010-05-01

    Full Text Available Anther and pollen development were studied in Olyra humilis Nees, Sucrea monophylla Soderstr, (Bambusoideae, Axonopus aureus P. Beauv., Paspalum polyphyllum Nees ex Trin. (Panicoideae, Eragrostis solida Nees, and Chloris elata Desv. (Chloridoideae. The objective of this study was to characterise, embryologically, these species of subfamilies which are considered basal, intermediate and derivate, respectively. The species are similar to each other and to other Poaceae. They present the following characters: tetrasporangiate anthers; monocotyledonous-type anther wall development, endothecium showing annular thickenings, secretory tapetum; successive microsporogenesis; isobilateral tetrads; spheroidal, tricellular, monoporate pollen grains with annulus and operculum. Nevertheless, the exine patterns of the species studied are distinct. Olyra humilis and Sucrea monophylla (Bambusoideae show a granulose pattern, whereas in the other species, it is insular. In addition, Axonopus aureus and Paspalum polyphyllum (Panicoideae have a compactly insular spinule pattern, while Chloris elata and Eragrostis solida (Chloridoideae show a sparsely insular spinule pattern. The exine ornamentation may be considered an important feature at the infrafamiliar level.O desenvolvimento da antera e do grão de pólen de Olyra humilis Nees, Sucrea monophylla Soderstr. (Bambusoideae, Axonopus aureus P. Beauv., Paspalum polyphyllum Nees ex Trin. (Panicoideae, Eragrostis solida Nees and Chloris elata Desv. (Chloridoideae foi estudado visando caracterizar embriologicamente essas espécies de subfamílias consideradas basal, intermediária e derivada, respectivamente. As espécies são similares entre si e entre as demais Poaceae. Apresentam os seguintes caracteres: anteras tetrasporangiadas; desenvolvimento da parede da antera do tipo monocotiledôneo, endotécio com espessamento de parede anelar, tapete secretor; microsporogênese sucessiva; tétrades isobilaterais; grãos de

  9. Basic chromosome numbers and polyploid levels in some South African and Australian grasses (Poaceae

    Directory of Open Access Journals (Sweden)

    J. J. Spies

    1991-10-01

    Full Text Available Chromosome numbers of 46 specimens of grasses, involving 24 taxa from South Africa and Australia, have been determined during the present study. For the first time chromosome numbers are given for Eragrostis sarmentosa (Thunb. Trin. (n = 20. Panicum aequinerve Nees (n = 18,  Digitaria argyrograpta (Nees Stapf (n = 9 and D. maitlandii Stapf & C.E. Hubb. (n = 9. Additional polyploid levels are described for Diplachne fusca (L. Beauv. ex Roem. & Schult. (n = 10 and Digitaria diagonalis (Nees Stapf var.  diagonalis (n = 9. B-chromosomes were observed in several different specimens. The presence of B-chromosomes often results in abnormal chromosomal behaviour during meiosis.

  10. Perennial pastures for marginal farming country in southern Queensland. 2. Potential new grass cultivar evaluation

    Directory of Open Access Journals (Sweden)

    Richard G. Silcock

    2015-01-01

    Full Text Available Trials in the Condamine-Balonne basin, Australia, compared 11 promising perennial pasture grass accessions (4 Bothriochloa, 2 Cenchrus, 2 Urochloa and 1 each of Digitaria, Eragrostis and Panicum species against the best similar commercial cultivars on the basis of ease of establishment from seed, persistence once established, forage yield and ease of seed production.  Accessions sown at a site were determined by prior experience with them on a range of soils.  High quality seed was relatively easy to produce for both Urochloa species and for Eragrostis curvula CPI 30374 but problematic for the Bothriochloa spp.  Once established, all accessions persisted for 3–5 years and most were well grazed, but adequate establishment was sometimes a problem with Panicum stapfianum and Bothriochloa ewartiana.  The dry matter yield ratings of the non-commercial lines were similar to those of the commercial equivalents of the same species.  While agronomically valuable, none of the promising new grasses was considered worthy of commercialization at this point because their strengths did not warrant the setting up of a seed-production business in competition with current commercial enterprises.  Long-standing cultivars such as Gayndah buffel and Nixon sabi grass continued to exhibit their superior pasture qualities.Keywords: Herbicide tolerance, persistence, forage yield, establishment ease, commercialization, seed production.DOI: 10.17138/TGFT(315-26

  11. IDENTIFIKASI TUMBUHAN SUKU POACEAE SEBAGAI SUPLEMEN MATAKULIAH KEANEKARAGAMAN TUMBUHAN

    Directory of Open Access Journals (Sweden)

    Desy Yanuarita Wulandari

    2017-01-01

    Full Text Available Poaceae known as plants used as food ingredients in Indonesian. One area thas has high level diversity of plants Poaceae is Tahura R. Soerjo. Morphological characterization Poaceae in that region are still rare. The Goal for this research are to identify Poaceae tribes, and make photography Poaceae data that can be used as a supplement on Diversity of Plants course. This study included descriptive exploratory study with free cruising method. The species Poaceae has identified are Bambusa multiplex, Dendrocalamus asper, Digitaria radicosa, Echinochloa sp, Eragrostis unioloides, Lophatherum gracile, Oplismenus burmanni, Paspalidium flavidum, Pennisetum alopecuroides, Phragmites karka, Setaria parviflor. Suku Poaceae dikenal sebagai tumbuhan yang dimanfaatkan sebagai bahan pangan masyarakat Indonesia. Salah satu daerah yang memiliki tingkat keanekaragaman tumbuhan Poaceae adalah di Tahura R. Soerjo. Karakterisasi morfologi terkait suku Poaceae di daerah tersebut masih sedikit. Tujuan dalam penelitian ini adalah untuk identifikasi suku Poaceae, membuat data fotografi suku Poaceae sehingga dapat digunakan sebagai suplemen keanekaragaman tumbuhan. Penelitian ini termasuk penelitian deskriptif eksploratif dengan metode jelajah bebas. Sebelas spesies suku Poaceae yang telah teridentifikasi, yaitu Bambusa multiplex, Dendrocalamus asper, Digitaria radicosa, Echinochloa sp, Eragrostis unioloides, Lophatherum gracile, Oplismenus burmanni, Paspalidium flavidum, Pennisetum alopecuroides, Phragmites karka, Setaria parviflora.

  12. Anther and pollen development in some species of Poaceae (Poales

    Directory of Open Access Journals (Sweden)

    AT. Nakamura

    Full Text Available Anther and pollen development were studied in Olyra humilis Nees, Sucrea monophylla Soderstr, (Bambusoideae, Axonopus aureus P. Beauv., Paspalum polyphyllum Nees ex Trin. (Panicoideae, Eragrostis solida Nees, and Chloris elata Desv. (Chloridoideae. The objective of this study was to characterise, embryologically, these species of subfamilies which are considered basal, intermediate and derivate, respectively. The species are similar to each other and to other Poaceae. They present the following characters: tetrasporangiate anthers; monocotyledonous-type anther wall development, endothecium showing annular thickenings, secretory tapetum; successive microsporogenesis; isobilateral tetrads; spheroidal, tricellular, monoporate pollen grains with annulus and operculum. Nevertheless, the exine patterns of the species studied are distinct. Olyra humilis and Sucrea monophylla (Bambusoideae show a granulose pattern, whereas in the other species, it is insular. In addition, Axonopus aureus and Paspalum polyphyllum (Panicoideae have a compactly insular spinule pattern, while Chloris elata and Eragrostis solida (Chloridoideae show a sparsely insular spinule pattern. The exine ornamentation may be considered an important feature at the infrafamiliar level.

  13. Revegetation on a coal fine ash disposal site in South Africa

    Energy Technology Data Exchange (ETDEWEB)

    Van Rensburg, L.; De Sousa Correia, R.I.; Booysen, J. [Potchefstroom Univ. for Christian Higher Education (South Africa). Research Inst. for Reclamation Ecology; Ginster, M. [Sastech Research and Development, Sasolburg (South Africa)

    1998-11-01

    Eight medium amendments were conducted on top of a fine ash coal dump (i) to evaluate a few cost-effective treatments that could determine the minimum fertility status required for the local ash to support the establishment of a viable vegetation cover, and (ii) to select suitable grass species that would establish on the ash and could serve as a foundation for long-term rehabilitation. Degree and success of grass establishment per medium amelioration treatment is expressed in terms of total biomass, percentage basal cover, and in terms of a condition assessment model. Both the chemical and physical nature of the ash medium before and after amendment was characterized, as were the concentrations of some essential and potentially toxic elements in leaf samples. In terms of medium amelioration 5000 kg ha{sup {minus}1} compost, or 500 kg ha{sup {minus}1} kraal manure or 480 kg 2:3:2 ha{sup {minus}1} proved to be most effective. The grass species that occurred with the highest frequency, irrespective of treatment, were the perennials bermudagrass [Cynodon dactylon (L.) pers. var dactylon], weeping lovegrass [Eragrostis curvula (Schrader) Nees], and the annual teff [Eragrostis tef (Zuccagni) Trotter]. Of the potentially toxic extractable metals monitored in the leaves of vegetation on the dump, only Se accumulated to an average level of 4.4 mg kg{sup {minus}1} that could be toxic to livestock.

  14. The grasses (Poaceae) of the Colombian guayana: analyses on their composition, richness, endemism, and invasion

    International Nuclear Information System (INIS)

    Canas, Diego Giraldo

    2010-01-01

    The checklist of grasses from Colombian Guayana is presented. In all, 152 species, 69 genera, and six subfamilies were recorded. Thus, in the Colombian Guayana is represented the 18.7 and 43.7% of the species and genera of Colombian grasses, respectively. The subfamilies with the highest number of species were Panicoideae (110 species/46 genera), Chloridoideae (21/9), and Bambusoideae (11/9). The most diverse genera were Paspalum (19 species), Panicum (16), Axonopus (14), Eragrostis (9), and Digitaria (8). Nineteen species are introduced and naturalized in the Colombian Guayana, which represent 12.5% of the agrostological flora for the Colombian Guayana. There were 8 endemic species (5.3% of Colombian Guayanan grasses). In addition, some species are reported for the first time for Colombian flora (belonging to Axonopus, Cyphonanthus, Gymnopogon, and Paspalum), and some species are new to science (belonging to Axonopus, Digitaria, Eragrostis, and Sacciolepis). On the other hand, some preliminary biogeographical aspect are analyzed Flora of Colombia,

  15. A Review on Gnetalean Megafossils: Problems and Perspectives

    Directory of Open Access Journals (Sweden)

    Yong Yang

    2010-11-01

    Full Text Available Gnetalean megafossils were accumulated in the last decade. Taxonomic positions of several of Ephedran megafossil species are, however, controversial, resulting in a complicated nomenclature. Liaoxia Z.Y. Cao & S.Q. Wu, “Eragrostis Z.Y. Cao & S.Q. Wu”, “Chaoyangia Duan”, and their type species “Liaoxia cheniae Z.Y. Cao & S.Q. Wu”, “Eragrostis changii Z.Y. Cao & S.Q. Wu”, “Chaoyangia liangii S.Y. Duan”, were not validly published in the original publication under the Vienna Code. The species “Liaoxia cheniae Z.Y. Cao & S.Q. Wu” was validly published as Ephedrites cheniae S.X. Guo & X.W. Wu but later combined into Liaoxia cheniae (S.X. Guo & X.W. Wu Z.Y. Cao & S.Q. Wu and further into Ephedra cheniae (S.X. Guo & X.W. Wu H.M. Liu et al. Some uncertain morphological characters are fundamental to elucidate the taxonomic position of Ephedrites cheniae S.X. Guo & X.W. Wu and “Chaoyangia liangii S.Y. Duan”, e.g. bract number, position, and connation in female cones, seed number and position in a female cone, and morphology of the furcated appendages of reproductive organs of “Chaoyangia liangii S.Y. Duan”.

  16. El género desordenado: Críticas en torno a la patologización de la transexualidad

    Directory of Open Access Journals (Sweden)

    Ange La Furcia

    2013-12-01

    Full Text Available Miquel Missé y Gerard Coll-Planas (editores (2010. El género desordenado: Críticas en torno a la patologización de la transexualidad Barcelona: Editorial EGALES. ISBN: 978-84-92813-20-9

  17. UOC Restaurant : gestió integral d'un restaurant

    OpenAIRE

    Vidal Andrade, Marta

    2012-01-01

    Desenvolupament d'una aplicació amb Microsoft.net per la gestió d'un restaurant i de la seva plana web. Desarrollo de una aplicación con Microsoft.net para la gestión de un restaurante y de su página web.

  18. ENVIRONMENTAL-EFFECTS ON THE GROWTH-RATE OF INTERTIDAL INVERTEBRATES AND SOME IMPLICATIONS FOR FORAGING WADERS

    NARCIS (Netherlands)

    WANINK, JH; ZWARTS, L

    1993-01-01

    The paper describes effects of intertidal height and sediment type on growth rate of the bivalves Cerastoderma edule, Macoma balthica, Mya arenaria, Mytilus edulis and Scrobicularia plana, and of the worms Arenicola marina, Nephtys hombergii and Nereis diversicolor in the eastern part of the Dutch

  19. Plani-ficación familiar

    Directory of Open Access Journals (Sweden)

    María Dolores López González

    2011-04-01

    Full Text Available Este cuento trata de introducir al lector de unamanera informal y divertida en el mundo de la geometría plana y de los movimientos o isometrías. Con la medicina como metáfora conductora, son presentados conceptos geométricos como las rectas, sus intersecciones, o giros y traslaciones de las mismas.

  20. A new species of Tristiropsis (Sapindaceae) from New Guinea

    NARCIS (Netherlands)

    Leenhouts, P.W.

    1978-01-01

    Arbor 8 m alta, trunco 26 cm diam. Ramuli ignoti. Folia certe 1,5 m longa, glabra; petiolus teres, canaliculatus, 36 cm longus, 1,25 cm crassus; rhachis teres, supra graciliter costata; rhaches secundariae alternantes; petioluli 1—4 mm longi, supra fossa lata plana instructi, basi dilatati. Foliola

  1. Características anatómicas, biomecánicas y aberrométricas de la córnea de pacientes con síndrome de Marfan

    Directory of Open Access Journals (Sweden)

    Manuel Garza-Leon

    2015-04-01

    Conclusiones: En nuestro grupo estudiado, la córnea de pacientes con síndrome de Marfan presenta córneas plana, con una paquimetría y propiedades biomecánicas normales pero con un coeficiente de aberraciones anormal.

  2. Do it yourself smartphone fundus camera – DIYretCAM

    Directory of Open Access Journals (Sweden)

    Biju Raju

    2016-01-01

    Full Text Available This article describes the method to make a do it yourself smartphone-based fundus camera which can image the central retina as well as the peripheral retina up to the pars plana. It is a cost-effective alternative to the fundus camera.

  3. Vivienda unifamiliar, en Brasil

    Directory of Open Access Journals (Sweden)

    Levi, Rino

    1962-05-01

    Full Text Available Se ha proyectado esta residencia particular en un solar relativamente pequeño, con 20 metros de fachada a la calle de Rusia. Está enclavada en zona noble y residencial, plana, por lo que desaparecen las posibilidades de gozar de vistas panorámicas.

  4. Workshop Proceedings: Toughening Mechanisms in Quasi-Brittle Materials Held on 16-20 July 1990 in Evanston, Illinois

    Science.gov (United States)

    1991-05-05

    2] Planas, J. and Elices, M., "Un Nuevo Mdtodo de An6lisis del Comportamiento Asint6tico de la Propagaci6n de una Fisura Cohesiva en Modo I...cohesive crack in mode I loading", Report 87-02, Departamento de Ciencia de Materiales , ETS de Ingenieros de Caminos, Ciudad Universitaria, 28040 Madrid

  5. NATO Advanced Research Workshop. Toughening Mechanisms in Quasi-Brittle Materials, Held in Evanston, Illinois on July 16-20, 1990

    Science.gov (United States)

    1990-07-20

    Planas, J. and Elices, M., "Un Nuevo Mdtodo de An~lisis del Comportamiento Asint6tico de la Propagaci6n de una Fisura Cohesiva en Modo ", Anales de...crack in mode I loading", Report 87-02, Departamento de Ciencia de Materiales , ETS de Ingenieros de Caminos, Ciudad Universitaria, 28040 Madrid, Spain

  6. Un arabisme interhispànic: «alcasser» / «alcacer»

    Directory of Open Access Journals (Sweden)

    Germà Colón

    2015-09-01

    Full Text Available From alcacer word appearence in Llibre del mostassaf d'Elx (17th century, the author proves, with Castelló de la Plana documentation of 14th and 15th centuries, how this arabism has already been included in Catalan, for this it can't be qualified litre a Castilian word, as it has believed.

  7. Un arabisme interhispànic: «alcasser» / «alcacer»

    OpenAIRE

    Colón, Germà

    1996-01-01

    From alcacer word appearence in Llibre del mostassaf d'Elx (17th century), the author proves, with Castelló de la Plana documentation of 14th and 15th centuries, how this arabism has already been included in Catalan, for this it can't be qualified litre a Castilian word, as it has believed.

  8. DECAIMIENTOS PARAMETRICOS DE ONDAS ELECTROMAGNETICAS EN PLASMAS DE ELECTRONES Y POSITRONES.

    OpenAIRE

    MUÑOZ GALVEZ, VICTOR HUGO; MUÑOZ GALVEZ, VICTOR HUGO

    1998-01-01

    En esta tesis se estudian los decaimientos paramétricos de ondas electromagnéticas en plasmas de electrones y positrones. Se considera, primero, la propagación de ondas planas electromagnéticas polarizadas lineal y circularmente en un plasma no magnetizad 107p.

  9. Epidemiologic characteristics of retinal detachment surgery at a specialized unit in Denmark

    DEFF Research Database (Denmark)

    Poulsen, Christina Doefler; Peto, Tunde; Grauslund, Jakob

    2016-01-01

    , pars plana vitrectomy (PPV), scleral buckling and combined operations were performed in 95.1% (n = 620), 4.6% (n = 30) and 0.3% (n = 2) respectively. Over time there was less use of silicone oil and greater use of gas tamponade (p =

  10. NONSUPINE POSITIONING IN MACULAR HOLE SURGERY

    DEFF Research Database (Denmark)

    Alberti, Mark; la Cour, Morten

    2016-01-01

    underwent pars plana vitrectomy, internal limiting membrane peeling, and perfluoropropane gas tamponade and were randomly allocated to either FDP or NSP. The primary (noninferior) outcome was FTMH closure. The sample size was based on an estimated 95% closure rate and a -15% noninferiority margin...

  11. Retinal changes detected by wide-field autofluorescence imaging of patients with primary rhegmatogenous retinal detachment

    DEFF Research Database (Denmark)

    Poulsen, Christina Døfler; Grauslund, Jakob; Peto, Tunde

    2014-01-01

    .2 million inhabitants. Methods: A clinical prospective study of 99 eyes in 99 patients undergoing surgery for primary RRD between 1st of January 2013 and 12th of July 2013. All patients underwent surgery with pars plana vitrectomy (PPV) and had either gas or silicone oil tamponade. Patients were examined...

  12. Functional recovery following vitreoretinal surgery

    NARCIS (Netherlands)

    Scheerlinck, LME

    2016-01-01

    The general aim of this thesis was to evaluate functional outcome following vitreoretinal surgery for idiopathic epiretinal membranes (iERM) and rhegmatogenous retinal detachment (RRD). Idiopathic epiretinal membrane Pars plana vitrectomy with removal of the iERM is considered to be the standard

  13. A Multi-Query Optimizer for Monet

    NARCIS (Netherlands)

    S. Manegold (Stefan); A.J. Pellenkoft (Jan); M.L. Kersten (Martin)

    2000-01-01

    textabstractDatabase systems allow for concurrent use of several applications (and query interfaces). Each application generates an ``optimal'' plan---a sequence of low-level database operators---for accessing the database. The queries posed by users through the same application can be optimized

  14. A multi-query optimizer for Monet

    NARCIS (Netherlands)

    S. Manegold (Stefan); A.J. Pellenkoft (Jan); M.L. Kersten (Martin)

    2000-01-01

    textabstractDatabase systems allow for concurrent use of several applications (and query interfaces). Each application generates an ``optimal'' plan---a sequence of low-level database operators---for accessing the database. The queries posed by users through the same application can be optimized

  15. Rare localisations of osteochondrosis juvenilis

    Energy Technology Data Exchange (ETDEWEB)

    Schumacher, R; Schuster, W; Mueller, U

    1981-04-01

    A survey of rare localisations of osteochondrosis juvenilis is given and illustrated by cases of Morbus Friedrich, Morbus Panner, Vertebra plana Calve, Morbus Blount, Morbus Iselin, Morbus Hegemann and Morbus Thiemann. This is followed by discussion of etiology and differential diagnosis.

  16. Seasonal variability in somatic and reproductive investment of the bivalve

    NARCIS (Netherlands)

    Santos, S.; Cardoso, J.F.M.F.; Carvalho, C.; Luttikhuizen, P.C.; van der Veer, H.W.

    2011-01-01

    Monthly investment in soma and gonads in the bivalve Scrobicularia plana is described for three populations along its distributional range: Minho estuary, Portugal; Westerschelde estuary, The Netherlands and Buvika estuary, Norway. Seasonal cycles in body mass (BMI), somatic mass (SMI) and

  17. SU-F-P-46: Comparative Study Between Two Normalization Prescriptions for Accelerated Partial Breast Irradiation: A Dosimetric Study

    Energy Technology Data Exchange (ETDEWEB)

    Agarwal, P; Sharma, D; Gandhi, A; Binjola, A; Subramani, V; Chander, S [All India Institute of Medical Sciences, New Delhi, New Delhi, Delhi (India)

    2016-06-15

    Purpose: To compare the Accelerated Partial Breast Irradiation (APBI) plan with the normalized basal dose points and 5mm box prescription. Methods: Five patients of APBI were planned twice in Oncentra Master planning TPS (Version 4.3) using TG-43 algorithm. The number of catheters for all the patients was 10 to 16 and implant plane 2 to 3. For planning all catheters were reconstructed. Source loading was done as per HR-CTV contoured. The HR-CTV volume range was from 75cc to 182cc. Plans were normalized in two methods. First all plans were normalized on Basal dose points (PlanA) and second all the plan were normalized on 5mm box (PlanB). The prescription dose (PD) was 35Gy in 10 fractions. All the plans were completely based on normalization and without optimization. Plan evaluation was based on certain parameters coverage Index (CI), dose homogeneity index (DHI), conformity index (COIN), over dose volume index (OI). Results: The average and median of CI for planA was 0.835 and 0.8154, for planB 0.82 and 0.799 respectively. The median and average of DHI for planA was 0.66 and 0.6062, for planB 0.67 and 0.62 respectively. The range of COIN for planA and planB was from 0.58 to 0.65 respectively. The range of OI was from 0.083 to 0.169 for planA and planB. The treatment time in planA was in average 1.13 times more than planB as V150% of HR-CTV in planA was 4–6% more. The ipsilateral lung was getting 30% of PD which was 0.6% to 3.5%. Conclusion: Treatment Planning should be individualized based on implants characteristics. Planning with prescription to basal dose points should be preferred to 5mm box prescription, in order to achieve better DHI and less treatment time.

  18. A case involving an Ahmed™ glaucoma valve transferred from the vitreous into the anterior chamber of the eye with a silicone oil tamponade for the treatment of neovascular glaucoma

    Directory of Open Access Journals (Sweden)

    Miki M

    2013-02-01

    Full Text Available Michiko Miki, Mari Ueki, Tetsuya Sugiyama, Shota Kojima, Tsunehiko IkedaDepartment of Ophthalmology, Osaka Medical College, Takatsuki, JapanPurpose: To report the short-term efficacy and safety of the transfer of an Ahmed™ glaucoma valve (AGV™ tube from the vitreous into the anterior chamber, in a patient with neovascular glaucoma who had undergone pars plana AGV™ implantation and ultimately needed a silicone oil tamponade.Case: A 41-year-old male with proliferative diabetic retinopathy in both eyes was referred to us for treatment in December 2009. Although the patient previously underwent several surgeries, he ultimately lost vision in his right eye. His left eye suffered from neovascular glaucoma after undergoing a pars plana vitrectomy for tractional retinal detachment. After several vitreous and glaucoma surgeries, the patient underwent implantation of a pars plana AGV™. Postoperatively, although his intraocular pressure was stabilized at approximately 10 mmHg, he had repeated vitreous hemorrhage and hyphema without improvement. He ultimately underwent PPV with a silicone oil tamponade and at the same time, the AGV™ tube was pulled out from the vitreous and inserted into the anterior chamber in order to avoid complications caused by the silicone oil.Results: At 19 months postoperative, the patient’s intraocular pressure had stabilized at 10 mmHg with no recurrence of vitreous hemorrhage and hyphema. Eventually, he lost vision in his left eye because of cerebral hemorrhage.Conclusion: The findings show that insertion of a pars plana AGV™ tube into the anterior chamber in a patient undergoing a silicone oil tamponade is both effective and safe in the short-term.Keyword: tube implantation, glaucoma surgery, tube transfer, pars plana, proliferative diabetic retinopathy, intraocular pressure

  19. A preliminaryfloristic checklist of thal desert punjab, pakistan

    International Nuclear Information System (INIS)

    Shaheen, H.; Qureshi, R.

    2014-01-01

    The floristic survey of the Thal desert, Punjab, Pakistan was carried out during 2010 to 2013. So far, 248 species distributed across 166 genera and 38 families were identified during the report period. Besides, one species viz., Themeda triandra was recorded for the first time from Pakistan. Of them, one fern, 4 monocots and 33 dicots families were determined. The most dominating family was Poaceae that contributed 52 species (21.49%), followed by Fabaceae (34 spp., 13.05%) and Amaranthaceae and Asteraceae (17 spp., 7.02% each). The largest genera were Euphorbia (6 spp.), Cyperus, Eragrostis and Solanum (5 spp. each), Mollugo, Heliotropium and Cenchrus (4 spp. each), Acacia, Prosopis, Tephrosia, Corchorus, Boerhavia and Ziziphus (3 spp. each). This checklist consists of updated systematic families and plants names that will provide a useful starting point for further ecological and bioprospective research of the area under study. (author)

  20. The effect of dietary protein on reproduction in the mare. I. The composition and evaluation of the digestibility of dietary protein from different sources

    Directory of Open Access Journals (Sweden)

    F.E. Van Niekerk

    1997-07-01

    Full Text Available Four rations that differed in their crude protein and essential amino-acid content were compiled. Digestibility of the crude protein and essential amino-acid contents were determined biologically in a feeding trial using 4 Anglo-Arab stallions. Their respective daily diets were: Diet 1: 2 kg cubes, 5 kg tef hay (Eragrostis tef; Diet 2: 2 kg cubes, 5 kg lucerne hay (Medicago sativa; Diet 3: 2 kg cubes, 5 kg tef hay, 200 g fishmeal; Diet 4: 2 kg cubes, 5 kg lucerne hay, 200 g fishmeal. The concentrations of the amino-acids threonine, iso-leucine, leucine and arginine were increased in the total ration when lucerne hay replaced the tef hay while fishmeal supplementation increased the methionine and lysine contents, which provided a wide range of concentrations of digestible amino-acids in each of the 4 rations.

  1. Desenvolvimento pós-seminal de espécies de Poaceae (Poales Post-seminal development of Poaceae species (Poales

    Directory of Open Access Journals (Sweden)

    Adriana Tiemi Nakamura

    2009-03-01

    Full Text Available O presente estudo objetivou verificar a existência de um padrão do desenvolvimento pós-seminal em Poaceae. Para tanto, foram estudadas as seguintes espécies: Olyra humilis Nees (Bambusoideae; Axonopus aureus P. Beauv. e Paspalum polyphyllum Nees ex Trin. (Panicoideae; Chloris elata Nees e Eragrostis solida Desv. (Chloridoideae. Procurou-se também comparar as estruturas da plântula de Poaceae com as demais monocotiledôneas. As espécies estudadas são plantas perenes, rizomatosas, cespitosas e apresentam cariopses de tamanhos diferentes. Apresentam sementes albuminosas; embrião lateral, diferenciado, com raiz endógena (adventícia; cotilédone dividido em hiperfilo (escutelo, bainha reduzida e hipofilo (coleóptilo; coleorriza (raiz primária reduzida e mesocótilo (eixo localizado entre o escutelo e coleóptilo. A presença de epiblasto (folha embrionária foi observada em Olyra humilis, Chloris elata e Eragrostis solida. O desenvolvimento pós-seminal é semelhante nas espécies estudadas e forma um padrão em Poaceae. Primeiramente, observa-se a emissão da coleorriza, que cresce no sentido geotrópico positivo, seguida do coleóptilo e plúmula que crescem em sentido contrário, a partir do desenvolvimento do mesocótilo. As primeiras folhas são semelhantes às folhas definitivas (metafilos das espécies, exceto em Olyra humilis, que são modificadas em catafilos e podem ser interpretadas como caráter basal em Bambusoideae. Raiz primária reduzida (coleorriza e hipofilo modificado em coleóptilo são considerados caracteres derivados em Poaceae, quando comparados com as demais monocotiledôneas.This work has aimed to verify the existence of a pattern of the post-seminal development in Poaceae. Thus, Olyra humilis Nees (Bambusoideae; Axonopus aureus P. Beauv. e Paspalum polyphyllum Nees ex Trin. (Panicoideae; Chloris elata Nees e Eragrostis solida Desv. (Chloridoideae have been studied. Besides, it was compared the structures of

  2. La familia Poaceae del distrito de Arahuay (Canta, Lima, Perú

    Directory of Open Access Journals (Sweden)

    Paúl Gonzáles

    2011-08-01

    Full Text Available Se reportan para el distrito de Arahuay (Canta, Lima, Perú (zona baja y media un total de 49 especies de la familia Poaceae agrupadas en 28 géneros, 14 tribus y 4 subfamilias. El género Poa es el más diverso con cinco especies, seguido por Eragrostis y Nassella con cuatro especies cada una. Las especies Calamagrostis spiciformis Hack. ex Stuck., Chloris halophila Parodi, Lamprothyrsus peruvianus Hitchc., Festuca glyceriantha Pilg., Lolium multiflorum Lam. y Poa supina Schrad. son nuevos reportes para el departamento de Lima. Se presentan claves dicotómicas para la determinación de los géneros y para las especies en los casos pertinentes. Para cada especie se incluye datos sobre su hábitat, distribución y el material estudiado.

  3. An ultrastructural and irradiation study of diffuse and localised kinetochore

    International Nuclear Information System (INIS)

    Bokhari, F.S.

    1979-05-01

    An electron microscope study of plant types Luzula nivea and Cyperus eragrostis with diffuse kinetochores and Crepis neglecta with localised kinetochore showed that Luzula has a rather different kinetochore organisation from Cyperus, with features approaching the localised type of Crepis. These studies included an examination of the ultrastructure of the kinetochore at metaphase at low magnification in control and irradiated material of Luzula; the chromosomal ultrastructure at high magnification at interphase and all stages of mitosis in Luzula, Cyperus and Crepis; and the ultrastructure of the nucleolus in Luzula, Cyperus and Crepis. Light microscopic studies were also performed showing the effects of irradiation on first mitotic division in Cyperus, Luzula and Crepis, mitotic aberrations in Cyperus and Crepis and meiosis in Cyperus. Finally, the survival with the diffuse as opposed to the localised kinetochore in M 1 and M 2 generations following seed irradiation was studied. (U.K.)

  4. The problem of maintaining large herbivores in small conservation areas: deterioration of the grassveld in the Addo Elephant National Park

    Directory of Open Access Journals (Sweden)

    P. Novellie

    1991-09-01

    Full Text Available Changes in vegetation cover and species composition in a grassland community during a six year period are reported. The grass Themeda triandra and the dwarf shrub Helichrysum rosum decreased in abundance, whereas the grass Eragrostis obtusa increased. Comparison of grazed plots with fenced plots revealed large herbivores were responsible for the increase in abundance ofE. obtusa. The abundance of T. triandra was influenced by large herbivores, but rainfall fluctuations apparently also played a role. The decline in relative abundance of/7. rosum was evidently not caused by large herbivores. Grass cover was closely determined by rainfall. A drought-induced decline in forage abundance evidently caused the buffalo population to crash.

  5. Phytotoxicity of sorgoleone found in grain Sorghum root exudates.

    Science.gov (United States)

    Einhellig, F A; Souza, I F

    1992-01-01

    Root exudates ofSorghum bicolor consist primarily of a dihydroquinone that is quickly oxidized to ap-benzoquinone named sorgoleone. The aim of this investigation was to determine the potential activity of sorgoleone as an inhibitor of weed growth. Bioassays showed 125μM sorgoleone reduced radicle elongation ofEragrostis tef. In liquid culture, 50-μM sorgoleone treatments stunted the growth ofLemna minor. Over a 10-day treatment period, 10μM sorgoleone in the nutrient medium reduced the growth of all weed seedlings tested:Abutilon theophrasti, Datura stramonium, Amaranthus retroflexus, Setaria viridis, Digitaria sanguinalis, andEchinochloa crusgalli. These data show sorgoleone has biological activity at extremely low concentrations, suggesting a strong contribution toSorghum allelopathy.

  6. [A comparative study on seed germination of 15 grass species in Keeqin Sandyland].

    Science.gov (United States)

    Liu, Zhimin; Li, Xuehua; Li, Rongping; Jiang, Deming; Cao, Chengyou

    2003-09-01

    A laboratory study was made on the germination characteristics of freshly-collected seeds of grass species at the Wulanaodu area of Keeqin Sandyland in Eastern Inner-Mongolia. Of the 15 species examined, 8 species including Clinelymus dahuricus, Cleistogenes squarrosa, Pappophorum boreale, Spodiopogon sibiricus, Phragmites communis, Chloris virgata, Arundinella hirta, Pennisetum alopecuroides had a germination rate of over 80%, but 4 species including Echinochloa hispidula, Hemarthria compressa, Tragus berteronianus and Setaria viridis had a value of less than 10%. Spodiopogon sibiricus, Eragrostis pilosa, Phragmites communis, Chloris virgata, Clinelymus dahuricus, Pappophorum boreale, Digitaria cilliaris and Cleistogenes squrrosa began to germinate within 1-3 days after the test began, while Setaria viridis, Tragus berteronianus and Hemarthria compressa failed to germinate in a period of more than 10 days. For the species such as Digitaria cilliaris, Echinochloa hispidula, Phragmites communis, Eragrostis pilosa and Spodiopogon sibiricus, their germination period was less than 10 days, while Clinelymus dahuricus and Pappophorum boreale had a germination period of more than 20 days. The days required for half the final germination rate to be reached were: 2 days for Chloris virgata, 3 days for Phragmites communis, 4 days for Spodiopogon sibiricus, 5 days for Clinelymus dahuricus and Cleistogenes squarrosa, 7 days for Arundinella hirta and Pappophorum boreale, and 10 days for Pennisetum alopecuriodes. Compared with the Sheffield region in Britain, the Wulanaodu area of Kerqin Sandyland had a higher proportion of annul grasses with a low germination rate and a longer germination period, and the perennial grasses at the Wulanaodu area had an approximately same germination rate, but a longer germination period. During germination, ruderals showed the potential for risk-sharring, and thus, they had a relatively higher disturbance-resistance capacity.

  7. EYE TRAUMA. OPEN GLOBE INJURY MANAGEMENT

    Directory of Open Access Journals (Sweden)

    Mojca Globočnik Petrovič

    2004-05-01

    Full Text Available Background. Ocular trauma is important cause of blindness. Birmingham Eye Trauma Terminology allows us to use a standardized eye injury terminology which permits an unambigous interpretation. The Eye Injury Registry enables the analysis of medical, epidemyologic and social data.The most frequent ocular injury ocular contusion has a relatively good prognosis. An adequate primary ocular repair and correct timing of pars plana vitrectomy are very important in open globe injury management. There still exist some controversial issues concerning the role of posterior segment surgery in open globe injuries. These include timing of surgery, prophylactic scleral buckle placement and a proper use of systemic and intravitreal antibiotics.Conclusions. With adequate primary ocular repair, the use of systemic, intravitreal antibiotics, scleral buckling and proper timing for pars plana vitrectomy the prognosis for ocular trauma cases can be better.

  8. Diffraction in the edge of a half plane in a bianisotropic media; Difraccion en el borde de un semiplano inmerso en un medio quiral bianisotropo

    Energy Technology Data Exchange (ETDEWEB)

    Villaroel, C; Torres, H.; Zamorano, M.; Obligado, A. [Universidad de Tarapaca, Arica (Chile)

    2001-04-01

    The diffraction of a non uniform plane electromagnetic wave by the edge of a electrically perfectly conducting half plane in a bi-anisotropic media is rigorously analyzed. The high-frequency asymptotic expansion reveals the existence of a coupling effect between a transverse magnetic (or transverse electric) incident plane wave and the transverse electric (or transverse magnetic) slope-diffracted field. A numerical verification using the Mathematic software is presented. [Spanish] Se analiza rigurosamente la difraccion, de una onda plana electromagnetica no-uniforme, en el borde (edge) de un semiplano perfectamente conductor inmerso en un medio quiral (bi-anisotropo). La expansion asintotica de la solucion exacta en alta frecuencia, evidencia la existencia de un efecto de acoplamiento, entre la onda plana transversal magnetica incidente (o transversal electrica) y el campo transversal electrico producido por la difraccion-pendiente (o transversal magnetico). Los campos difractados se evaluan numericamente utilizando el software Matematica.

  9. Partial-thickness macular hole in vitreomacular traction syndrome: a case report and review of the literature

    Directory of Open Access Journals (Sweden)

    Al Sabti Khalid

    2010-01-01

    Full Text Available Abstract Introduction Vitreomacular traction syndrome has recently been recognized as a distinct clinical condition. It may lead to many complications, such as cystoid macular edema, macular pucker formation, tractional macular detachment, and full-thickness macular hole formation. Case presentation We report a case of vitreomacular traction syndrome with eccentric traction at the macula and a partial-thickness macular hole in a 63-year-old Pakistani Punjabi man. The patient was evaluated using optical coherence tomography, and he underwent a successful pars plana vitrectomy. After the operation, his foveal contour regained normal configuration, and his visual acuity improved from 20/60 to 20/30. Conclusions Pars plana vitrectomy prevents the progression of a partial thickness macular hole in vitreomacular traction syndrome. The relief of traction by vitrectomy restores foveal anatomy and visual acuity in this condition.

  10. Intravitreal Angiostrongylus cantonensis: first case report in South America

    Directory of Open Access Journals (Sweden)

    Gabriel Costa de Andrade

    Full Text Available ABSTRACT This study reports the first case of intravitreal angiostrongyliasis in South America treated with posterior worm removal via pars plana vitrectomy. This was a retrospective, observational case study. Data from medical charts, wide-field digital imaging, ocular ultrasound, and visual evoked potential studies were reviewed. A 20-month-old boy presented with eosinophilic meningitis and right eye exotropia. Polymerase chain reaction analysis of the cerebrospinal fluid showed a positive result for Angiostrongylus cantonensis. Fundus examination revealed a pale optic disc, subretinal tracks, vitreous opacities, peripheral tractional retinal detachment, and a dead worm in the vitreous cavity. The patient underwent pars plana vitrectomy with worm removal. This case report illustrates the first case of intravitreal angiostrongyliasis in South America, possibly related to the uncontrolled spread of an exotic invasive species of snail.

  11. Bilateral proliferative retinopathy in B-cell acute lymphoblastic leukemia

    Directory of Open Access Journals (Sweden)

    Devesh Kumawat

    2018-01-01

    Full Text Available A 4-year-old child with B-cell acute lymphoblastic leukemia presented with vitreous hemorrhage due to proliferative retinopathy in both eyes. Pars plana vitrectomy was performed in both eyes to clear nonresolving vitreous hemorrhage after systemic stabilization. Visual recovery was limited by the disc drag in the right eye and subfoveal exudation in the left eye. Etiopathogenesis and management of proliferative retinopathy in acute leukemias are discussed.

  12. A comparative study of the contamination of some marine burrower invertebrates by cobalt 60 and cesium 137

    International Nuclear Information System (INIS)

    Amiard-Triquet, C.

    1975-01-01

    Experments were carried out with species whose mode of life is characterized by close contact with the sediments; they represent different zoological groups: an Annelid (Arenicola marina L.), an Echinoderm (Echinocardium cordatum Pennant) and two Lamellibranchs (Scrobicularia plana da Costa, Macoma balthica L.). The data obtained indicate that main vector of contamination of benthic marine invertebrates is water. The main part of these organisms in the sedimentary zone would be the redistribution, within the sediment, of radioelements adsorbed on the surface [fr

  13. Bilateral spontaneous dislocation of posterior chamber intraocular lens in a patient with gyrate atrophy

    Directory of Open Access Journals (Sweden)

    Michael Kinori

    2012-01-01

    Full Text Available We report a patient with gyrate atrophy, a rare metabolic disease, who had bilateral late spontaneous posterior dislocation of in-the-bag posterior chamber intraocular lens (PCIOL. He underwent pars plana vitrectomy, PCIOL retrieval and anterior chamber intraocular lens implantation in both eyes. This report may imply that patients with gyrate atrophy are at risk for spontaneous dislocation of intraocular lenses.

  14. Intravitreal Phacoemulsification Using Torsional Handpiece for Retained Lens Fragments

    OpenAIRE

    Kumar, Vinod; Takkar, Brijesh

    2016-01-01

    Purpose: To evaluate the results of intravitreal phacoemulsification with torsional hand piece in eyes with posteriorly dislocated lens fragments. Methods: In this prospective, interventional case series, 15 eyes with retained lens fragments following phacoemulsification were included. All patients underwent standard three-port pars plana vitrectomy and intravitreal phacoemulsification using sleeveless, torsional hand piece (OZiL™, Alcon's Infiniti Vision System). Patients were followed up...

  15. Áreas de polígonos via determinantes

    OpenAIRE

    Zerbinatti, Paulo Henrique [UNESP

    2015-01-01

    The aim of this work is to present a study on areas of polygons through their vertex coordinates. We treat the subject using determinants of order 2 and basic Euclidean Geometry O objetivo deste trabalho e apresentar um estudo sobre o c alculo de areas de pol gonos atrav es das coordenadas de seus v ertices. Faremos isto utilizando determinantes de ordem 2 e conceitos b asicos de Geometria Euclidiana Plana

  16. Project Manager’s Guide to the Scientific and Technical Information (STINFO) Program and Technical Publications Process

    Science.gov (United States)

    1993-12-01

    Iaporta .. y be definitive for the tubjoct proaentod, exploratory in natura, or an evaluation of critical Aubayato• or of technical problema , 4...International Security 9 Social and Natural Science Studies Field 41 Edit: (Type 3) -Entry of an invalid code when Performance Type is "C" or "M" will...analysis SF Foreign area social science research SP Foreign area policy planAing research BF Identifies databases with data on foreign forces or

  17. Argumentos de Bioética en el Islam: aborto, planificación familiar e inseminación artificial (Elisabetta Necco)

    OpenAIRE

    Plana Aznar, Jordi

    2012-01-01

    Un comentario de: Jordi Plana Aznar, Secretario de la Asociación de Bioética y Derecho de la Universitat de Barcelona. Sobre el libro: NECCO, Elisabetta: Argumentos de Bioética en el Islam: aborto, planificación familiar e inseminación artificial. Colección Cuadernos de Almenara 14, CantArabia Ediciones, Madrid, 2010. ISBN 978-84-86514-70-9. 58 páginas.

  18. Linguatula serrata in the anterior chamber of the eye

    Directory of Open Access Journals (Sweden)

    Muna Bhende

    2014-01-01

    Full Text Available We report a case of intraocular Linguatula in healthy young female who presented with a history of trivial trauma, dislocated lens, inflammation and secondary glaucoma. A mobile worm was seen in the anterior chamber. Pars plana lensectomy and vitrectomy was planned to remove both the cataractous lens and the parasite during which the worm disappeared from view but was later recovered from the cassette fluid. It was identified as the nymphal form of Linguatula serrata (tongue worm.

  19. Success Rates of Vitrectomy in Treatment of Rhegmatogenous Retinal Detachment

    OpenAIRE

    Mohamed, Yasser Helmy; Ono, Kozue; Kinoshita, Hirofumi; Uematsu, Masafumi; Tsuiki, Eiko; Fujikawa, Azusa; Kitaoka, Takashi

    2016-01-01

    Aim. To investigate the anatomical success rates of pars plana vitrectomy (PPV) after primary rhegmatogenous retinal detachment (RRD). Methods. This retrospective study was conducted between December 2008 and October 2014 at Nagasaki University Hospital. The preoperative data recorded included the lens status, location of the retinal tear, whether a tear was visualized, presence of multiple tears, macula status, presence of peripheral lattice retinal degeneration, and best-corrected visual ac...

  20. A fast and reliable way to establish fluidic connections to planar microchips

    DEFF Research Database (Denmark)

    Snakenborg, Detlef; Perozziello, Gerardo; Geschke, Oliver

    2007-01-01

    In this work, we present a non-permanent method to connect microfluidic devices. The approach uses short flexible tubes that are plugged into bottom-flat holes and ensure fast and reliable interconnections. The small available dimensions allow the tube to be directly attached to the side of plana...... microchips. A theoretical model to estimate the maximum applicable pressure was developed, and verified with experimental data. Furthermore, the tube connections were compared to other non-permanent interconnection types....

  1. Surgical management of spontaneous in-the-bag intraocular lens and capsular tension ring complex dislocation

    Directory of Open Access Journals (Sweden)

    Uzeyir Gunenc

    2014-01-01

    Full Text Available We describe a technique to manage late spontaneous intraocular lens (IOL and capsular tension ring (CTR dislocation within the intact capsular bag. The subluxated IOL and CTR complex can be positioned in a closed chamber and fixed to the pars plana at both 3 and 9 o′clock quadrants with the presented ab externo direct scleral suturation technique which provides an easy, safe and effective surgical option for such cases.

  2. Outcome of 20-gauge transconjunctival cannulated sutureless vitrectomy using silicone oil or air tamponade

    OpenAIRE

    Mohamed, Ahmed Abdel Alim; Abdrabbo, Mohamed

    2013-01-01

    Ahmed Abdel Alim Mohamed,1 Mohamed Abdrabbo21Ain Shams University, Faculty of Medicine, Ophthalmology Department, Cairo; 2Faculty of Medicine, Ophthalmology Department, Benha University, Benha, EgyptBackground: The purpose of this study was to assess the outcome of pars plana vitrectomy using a 20-gauge transconjunctival cannulated sutureless system with air or silicone oil tamponade in cases of retinal detachment of different etiologies.Methods: A prospective study was performed in 60 eyes f...

  3. Ahmed Glaucoma Valve Implantation in Vitrectomized Eyes

    OpenAIRE

    Erçalık, Nimet Yeşim; İmamoğlu, Serhat

    2018-01-01

    Purpose. To evaluate the outcomes of Ahmed glaucoma valve (AGV) implantation in vitrectomized eyes. Materials and Methods. The medical records of 13 eyes that developed glaucoma due to emulsified silicon oil or neovascularization following pars plana vitrectomy and underwent AGV implantation were retrospectively reviewed. The main outcome measures were intraocular pressure (IOP), best-corrected visual acuity (BCVA), number of antiglaucoma medications, and postoperative complications. Surgical...

  4. Dietary toxicity of field-contaminated invertebrates to marine fish: effects of metal doses and subcellular metal distribution.

    Science.gov (United States)

    Dang, Fei; Rainbow, Philip S; Wang, Wen-Xiong

    2012-09-15

    There is growing awareness of the toxicological effects of metal-contaminated invertebrate diets on the health of fish populations in metal-contaminated habitats, yet the mechanisms underlying metal bioaccumulation and toxicity are complex. In the present study, marine fish Terapon jurbua terepon were fed a commercial diet supplemented with specimens of the polychaete Nereis diversicolor or the clam Scrobicularia plana, collected from four metal-impacted estuaries (Tavy, Restronguet Creek, West Looe, Gannel) in southwest England, as environmentally realistic metal sources. A comparative toxicological evaluation of both invertebrates showed that fish fed S. plana for 21 d exhibited evident mortality compared to those fed N. diversicolor. Furthermore, a spatial effect on mortality was observed. Differences in metal doses rather than subcellular metal distributions between N. diversicolor and S. plana appeared to be the cause of such different mortalities. Partial least squares regression was used to evaluate the statistical relationship between multiple-metal doses and fish mortality, revealing that Pb, Fe, Cd and Zn in field-collected invertebrates co-varied most strongly with the observed mortality. This study provides a step toward exploring the underlying mechanism of dietary toxicity and identifying the potential causality in complex metal mixture exposures in the field. Copyright © 2012 Elsevier B.V. All rights reserved.

  5. Estimation of surface runoff for calculating recharge in the karstic massif of Ports of Beseit (Tarragona, Spain) combining water balance in the soil and analysis of flow hydrographs

    Energy Technology Data Exchange (ETDEWEB)

    Espinosa Martinez, S.; Custodio, E.

    2016-07-01

    For the right estimation of aquifer recharge by precipitation surface taking into account runoff is particularly relevant. Non considering it in the estimation of the groundwater resources can overestimate them. In the Baix Ebre aquifer system, in southern Catalonia, the surface and vadose zone runoff produced in the karstified carbonate formations in the Ports de Beseit massif has to be evaluated in order to achieve a better estimation of the resources transferred from this massif to the Plana de La Galera plain. Starting from the conceptual hydrogeological model, the average annual runoff is estimated. It includes the discharge from temporal perched aquifers in the Ports de Beseit massif, in the Matarraña river basin, and in the SE watershed to the Plana de La Galera plain. This is performed by analyzing the river and tributaries hydrographs, the filling and emptying hydrographs of the Ulldecona reservoir, and the soil water balance using the Visual Balan code applied to obtain the runoff in the Ulldecona reservoir watershed. The runoff has been estimated about 105±20 mm·yr−1, which represents 20–30% of average annual recharge in the Ports, estimated with soil water balance and atmospheric chloride deposition balance, about 350–500 mm·yr−1, which is mostly transferred laterally to the Plana de La Galera plain. (Author)

  6. Estimation of surface runoff for calculating recharge in the karstic massif of Ports of Beseit (Tarragona, Spain) combining water balance in the soil and analysis of flow hydrographs

    International Nuclear Information System (INIS)

    Espinosa Martinez, S.; Custodio, E.

    2016-01-01

    For the right estimation of aquifer recharge by precipitation surface taking into account runoff is particularly relevant. Non considering it in the estimation of the groundwater resources can overestimate them. In the Baix Ebre aquifer system, in southern Catalonia, the surface and vadose zone runoff produced in the karstified carbonate formations in the Ports de Beseit massif has to be evaluated in order to achieve a better estimation of the resources transferred from this massif to the Plana de La Galera plain. Starting from the conceptual hydrogeological model, the average annual runoff is estimated. It includes the discharge from temporal perched aquifers in the Ports de Beseit massif, in the Matarraña river basin, and in the SE watershed to the Plana de La Galera plain. This is performed by analyzing the river and tributaries hydrographs, the filling and emptying hydrographs of the Ulldecona reservoir, and the soil water balance using the Visual Balan code applied to obtain the runoff in the Ulldecona reservoir watershed. The runoff has been estimated about 105±20 mm·yr−1, which represents 20–30% of average annual recharge in the Ports, estimated with soil water balance and atmospheric chloride deposition balance, about 350–500 mm·yr−1, which is mostly transferred laterally to the Plana de La Galera plain. (Author)

  7. Posterior subtenon triamcinolone acetonide in gas-filled eyes as an adjunctive treatment for complicated proliferative diabetic retinopathy.

    Science.gov (United States)

    Lee, Yongeun; Kang, Seungbum; Park, Young-Hoon

    2013-02-01

    To evaluate the effect of adjunctive subtenon injection of triamcinolone acetonide (TA) in gas-filled eyes after vitrectomy for complicated proliferative diabetic retinopathy (PDR). This nonrandomized comparative study included 27 patients (27 eyes) who underwent pars plana vitrectomy and gas tamponade for treatment of PDR with tractional or combined tractional-rhegmatogenous retinal detachment and who received subtenon injection of TA (40 mg) at the end of surgery. The study group was compared with the control group (29 eyes), which was matched with the study group for preoperative and intraoperative parameters, but underwent pars plana vitrectomy and gas tamponade without a subtenon injection of TA. Retinal reattachments without reoperation were achieved in 25 eyes (92.6%) and 26 eyes (89.7%) at 6 months (p = 1.000) in the study and control groups, respectively. The study group and the control group did not differ significantly in the frequency of postoperative proliferative vitreoretinopathy, retinal redetachment rate, reoperation rate, macular pucker formation, postoperative vitreous hemorrhage, gain in visual acuity, intraocular pressure, and intraocular inflammation (p > 0.05). The clinical results of pars plana vitrectomy for complicated PDR are not improved significantly by an adjunctive subtenon TA injection in gas-filled eyes.

  8. Surgical treatment of hereditary lens subluxations.

    Science.gov (United States)

    Ozdek, Sengul; Sari, Ayca; Bilgihan, Kamil; Akata, Fikret; Hasanreisoglu, Berati

    2002-01-01

    To evaluate the effectiveness and results of pars plana vitreolensectomy approach with transscleral fixation of intraocular lens in hereditary lens subluxations. Fifteen eyes of 9 consecutive patients with a mean age of 12.8+/-6.2 years (6-26 years) with hereditary lens subluxation were operated on and the results were evaluated in a prospective study. Surgery was considered if best spectacle corrected visual acuity (BSCVA) was less than 20/70. All eyes underwent a 2-port pars plana vitreolensectomy and transscleral fixation of an intraocular lens (IOL). The mean follow-up period was 12.6+/-7.5 months (6-22 months). There was no major intraoperative complication. Preoperatively, 8 eyes (53.3%) had a BSCVA of counting fingers (CF) and 7 eyes (46.6%) had a BSCVA of 20/200 to 20/70. Postoperatively, 14 eyes (93.3%) had a BSCVA of 20/50 or better. None of the patients had IOL decentration or intraocular pressure (IOP) increase during the follow-up period. There was a macular hole formation in 1 eye postoperatively. The early results of pars plana vitreolensectomy with IOL implantation using scleral fixation technique had shown that it not only promises a rapid visual rehabilitation but it is also a relatively safe method. More serious complications, however, may occur in the long term.

  9. COMPARATIVE ANALYSIS OF RETINAL REATTACHMENT SURGERY WITH OR WITHOUT INTERNAL LIMITING MEMBRANE PEELING TO PREVENT POSTOPERATIVE MACULAR PUCKER.

    Science.gov (United States)

    Forlini, Matteo; Date, Purva; Ferrari, Luisa Micelli; Lorusso, Massimo; Lecce, Gabriella; Verdina, Tommaso; Neri, Giovanni; Benatti, Caterina; Rossini, Paolo; Bratu, Adriana; DʼEliseo, Domenico; Ferrari, Tommaso Micelli; Cavallini, Gian Maria

    2017-07-18

    To determine whether internal limiting membrane (ILM) peeling during pars plana vitrectomy for rhegmatogenous retinal detachment reduces the incidence of epiretinal membrane (ERM) formation. In this retrospective study, preoperative, intraoperative, and postoperative data from all eyes undergoing pars plana vitrectomy for rhegmatogenous retinal detachment between January 2007 and December 2013 was analyzed. All cases with at least 1-year of follow-up were included. Data collection included vision, intraoperative complications, occurrence of ERM, and spectral domain optical coherence tomography characteristics. The OCTs were retrieved for all eyes and were graded by a single masked grader. Out of 159 eyes recruited, ILM peeling was done in 78 eyes (49%). Overall occurrence of ERM was 20%. Seven eyes (9%) in ILM peeling group and 25 eyes in the non-ILM peeling group (31%) showed ERM (P = 0.001). Postoperative vision was significantly better in eyes that had ILM peeling (0.48 ± 0.4 logarithm of the minimum angle of resolution [20/63] vs. 0.77 ± 0.6 logarithm of the minimum angle of resolution [20/125], P = 0.003). In multivariable models adjusting for type of tamponade, ILM peeling reduced the likelihood of ERM formation by 75% (P = 0.01). Internal limiting membrane peeling during pars plana vitrectomy for rhegmatogenous retinal detachment significantly reduces ERM formation in the postoperative period and is associated with better visual and anatomical outcomes.

  10. [Vitrectomy and gas-fluid exchange for the treatment of serous macular detachment due to optic disc pit: long-term evaluation].

    Science.gov (United States)

    Moreira Neto, Carlos Augusto; Moreira Junior, Carlos Augusto

    2013-01-01

    To evaluate 5 patients with serous macular detachment due to optic disc pit that were submitted to pars plana vitrectomy and were followed for at least 7 years. Patients were submitted to pars plana vitrectomy, posterior hyaloid removal, autologous serum injection and gas-fluid exchange, without laser photocoagulation, and were evaluated pre and post-operatively with visual acuity and Amsler grid testing, retinography, and recently, with autofluorescence imaging and high resolution OCT. All 5 eyes improved visual acuity significantly following the surgical procedure maintaining good vision throughout the follow-up period. Mean pre-operative visual acuity was 20/400 and final visual acuity was 20/27 with a mean follow-up time of 13.6 years. No recurrences of serous detachments were observed. OCT examinations demonstrated an attached retina up to the margin of the pit. Serous macular detachments due to optic disc pits were adequately treated with pars plana vitrectomy and gas fluid exchange, without the need for laser photocoagulation, maintaining excellent visual results for a long period of time.

  11. Efeito de diferentes períodos de controle das plantas daninhas na produtividade da cultura da cebola Effect of different weed control periods on onion crop yield

    Directory of Open Access Journals (Sweden)

    D.J. Soares

    2004-12-01

    Full Text Available Foi realizado um experimento em Monte Alto-SP, visando estudar os efeitos de diferentes períodos de controle das plantas daninhas sobre a produção de bulbos da cultura da cebola (Allium cepa, cultivar 'Mercedes', no sistema de transplantio. O delineamento experimental utilizado foi o de blocos ao acaso, com quatro repetições. Parte dos tratamentos experimentais foi disposta num esquema fatorial 4 x 6, em que constituíram variáveis quatro períodos em que se fez o controle (0-0, 0-7, 0-14 e 0-21 DAT e seis períodos em que se reiniciou o controle das plantas daninhas prolongando até a colheita: 28, 42, 56, 70, 84 e 98 DAT. Duas testemunhas foram adotadas: uma com controle e outra sem controle das plantas daninhas durante todo o ciclo da cultura. Lycopersicon esculentum, Portulaca oleracea, Eragrostis pilosa e Galinsoga parviflora foram as plantas daninhas mais importantes na área. Não houve interação entre os diferentes períodos de controle das plantas daninhas. O controle inicial destas plantas deve se prolongar até 14 DAT e ser reiniciado aos 28 DAT, a fim de prevenir reduções significativas na produtividade em relação à testemunha no limpo A convivência com as plantas daninhas durante todo o ciclo da cebola reduziu a produtividade em 94,5%.An experiment was carried out in Monte Alto, SP to study the effects of different of weed control periods on the yield of onion (Allium cepa bulb, 'Mercedes' cultivar, under the transplanting system. The experiment was arranged in a completely randomized block design, with four replications. The treatments were arranged in 4 x 6 factorial design with four initial weed removal periods (after transplanting until 0, 7, 14 and 21 days and six final weed removal periods (from 28, 42, 56, 70, 84 or 98 days after transplanting until harvest. Two controls were adapted with and without weed control throughout the onion cycle. Lycopersicon esculentum, Portulaca oleracea, Eragrostis pilosa and

  12. Eficácia de herbicidas no controle de plantas daninhas na cultura da cebola em semeadura direta Efficacy of herbicides on weed control in onion direct sowing

    Directory of Open Access Journals (Sweden)

    Lino R. Ferreira

    1999-04-01

    Full Text Available As plantas de cebola provenientes da semeadura direta no campo são mais danificadas pelo cultivo mecânico e são mais sensíveis aos herbicidas, principalmente os latifolicidas, do que quando transplantadas. Com o objetivo de avaliar a eficácia dos herbicidas oxyfluorfen, ioxynil-octanoato e fluazifop-p-butil, aplicados em pós-emergência, isoladamente ou em mistura no tanque, com ou sem aplicação de paraquat, antes da emergência das plantas de cebola, conduziu-se este trabalho no município de Monte Alto, SP. Nenhum dos herbicidas aplicados isoladamente foi eficiente no controle de todas as espécies daninhas presentes na área experimental. As misturas no tanque de fluazifop-p-butil com oxyfluorfen ou ioxynil-octanoato, independente da aplicação ou não de paraquat aos cinco dias após a semeadura, controlaram eficientemente Portulaca oleracea, Amaranthus lividus, Echinochloa crusgalli, Eragrostis pilosa, Digitaria horizontalis, Eleusine indica e Brachiaria plantaginea, com produção de bulbos semelhante à da testemunha capinada.Onion plants, from direct sowing to the field, are more damaged by mechanical cultivation and more sensitive to herbicides, especially to broadleaf herbicides, than transplanted onions. With the purpose of evaluating the efficacy of the herbicides oxyfluorfen, ioxynyl-octanoato and fluazifop-p-butyl, applied in post-emergence, alone or tank mix, with or without paraquat application, before onion plants emergence, this investigation was carried out at Monte Alto County, São Paulo State, Brazil. None of the herbicides sprayed alone were efficient in the control of all the weeds present in the experimental area. The tank mix of fluazifop-p-butyl plus oxyfluorfen or ioxynyl-octanoato, regardless of paraquat application, at five days after sowing, controlled efficiently Portulaca oleracea, Amaranthus lividus, Echinoclhoa crusgalli, Eragrostis pilosa, Digitaria horizontalis, Eleusine indica and Brachiaria

  13. An African grassland responds similarly to long-term fertilization to the Park Grass experiment.

    Directory of Open Access Journals (Sweden)

    David Ward

    Full Text Available We compared the results of a long-term (65 years experiment in a South African grassland with the world's longest-running ecological experiment, the Park Grass study at Rothamsted, U.K. The climate is warm and humid in South Africa and cool and temperate in England. The African grassland has been fertilized with two forms of nitrogen applied at four levels, phosphorus and lime in a crossed design in 96 plots. In 1951, about 84% of plant cover consisted of Themeda triandra, Tristachya leucothrix and Setaria nigrirostris. Currently, the dominant species are Panicum maximum, Setaria sphacelata and Eragrostis curvula, making up 71% of total biomass. As in the Park Grass experiment, we found a significant (additive interaction effect on ANPP of nitrogen and phosphorus, and a (marginally significant negative correlation between ANPP and species richness. Unlike the Park Grass experiment, there was no correlation between ANPP and species richness when pH was included as a covariate. There was also a significant negative effect of nitrogen amount and nitrogen form and a positive effect of lime on species richness and species diversity. Soil pH had an important effect on species richness. Liming was insufficient to balance the negative effects on species richness of nitrogen fertilization. There was a significant effect of pH on biomass of three abundant species. There were also significant effects of light on the biomass of four species, with only Panicum maximum having a negative response to light. In all of the abundant species, adding total species richness and ANPP to the model increased the amount of variance explained. The biomass of Eragrostis curvula and P. maximum were negatively correlated with species richness while three other abundant species increased with species richness, suggesting that competition and facilitation were active. Consistent with the results from the Park Grass and other long-term fertilization experiments of grasslands

  14. Distribuição mensal da emergência de seis ervas daninhas em solos com e sem cultivos Monthly emergence of six weeds in cultived and undisturbed soil

    Directory of Open Access Journals (Sweden)

    Hélio G. Blanco

    1994-01-01

    Full Text Available Foram realizados no período de 14 meses, com início em outubro de 1988, levantamentos demográficos mensais para registro da dinâmica de emergência de seis espécies de ervas daninhas anuais, submetidas mensalmente a um dos seguintes sistemas de manejo da população: grade de disco, grade de disco seguida de rolo compactador do solo, enxada rotativa, e herbicida de contato. Os resultados mostraram que a distribuição mensal da emergência de Digitaria horizontalis Willd. (capim-colchão, Brachiaria plantaginea (Link Hitch. (capim-marmelada, Bidens pilosa L. (picão-preto, e Amaranthus viridis L. (caruru-de-mancha, se configurou com um pico de emergência muito alto em outubro (acima de 80% do total emergido no período, com reinfestações pouco significativas nos meses seguintes, e que o manejo através do cultivo do solo favoreceu a emergência dessas espécies. O modelo de emergência de Eleusine indica (L. Gaertn. (capim-pé-de-galinha, e Eragrostis pilosa (L. Beauv. (capim-barba-de-alemão, por outro lado, apresentou um grau de emergência baixo em outubro, elevando-se até janeiro quando ocorreu o fluxo de maior pico. O manejo sem revolvimento do solo dessas duas espécies incrementou a geminação dos propágulos do banco de sementes. De um modo geral, quando não se permitiu a multiplicação sexuada, a taxa de população foi extremamente reduzida no ciclo seguinte.In lhe period of October/l988 to December/1989 a research was carried out to study lhe emergence dynamics of six weeds through monthly samplings under four weed managements: destruction of lhe former flora by cultivation with harrow, harrow following compaction by soil roller, rotary harrow and use of a contact herbicide without soil disturbance. The results showed that lhe initial emergence in October is very high for Digitaria horizontalis, Brachiaria plantaginea, Bidens pilosa and Amaranthus viridis compared with lhe emergence in lhe following months and that

  15. A classification system of intraocular lens dislocation sites under operating microscopy, and the surgical techniques and outcomes of exchange surgery.

    Science.gov (United States)

    Hayashi, Ken; Ogawa, Soichiro; Manabe, Shin-Ichi; Hirata, Akira; Yoshimura, Koichi

    2016-03-01

    The aim of this study was to examine the recent status of intraocular lens (IOL) dislocation according to a classification system based on vertical dislocation position, as well as the surgical techniques and outcomes of IOL exchange surgery. The medical records of 230 eyes from 214 consecutive patients who experienced IOL dislocation and underwent exchange surgery between 2006 and 2014 were reviewed. Vertical dislocation sites observed preoperatively under operating microscopy were examined, along with the surgical techniques and outcomes of IOL exchange. Dislocation sites included (1) the anterior chamber (12.2 %), (2) pseudophakodonesis (19.1 %), (3) the anterior vitreous cavity (47.4 %), (4) trap door-like dislocation (dangling in the peripheral vitreous cavity; 16.1 %), and (5) the retinal surface (5.2 %). The IOL retained in the anterior segment was moved onto the iris by pulling it up through the limbal side ports with an anterior vitrectomy (67.8 %), or by pushing it up from the pars plana with an anterior vitrectomy (26.5 %), while the IOL dropped on the retina was lifting it up from the retina after pars plana vitrectomy (5.7 %). Mean uncorrected and distance-corrected visual acuity significantly improved postoperatively (p system, approximately 95 % of dislocated IOLs were retained in the anterior segment, and these IOLs were exchanged using an anterior approach through limbal incisions with an anterior vitrectomy. Visual acuity improved significantly, and serious complications were uncommon, probably because the IOL exchange techniques were standardized and simplified without pars plana vitrectomy.

  16. Clinically undetected retinal breaks causing retinal detachment: A review of options for management.

    Science.gov (United States)

    Gupta, Deepak; Ching, Jared; Tornambe, Paul E

    2017-08-12

    The successful detection of retinal breaks is a critical step in rhegmatogenous retinal detachment surgery in order to prevent persistent/recurrent retinal detachments. Not all retinal breaks causing retinal detachments are obvious. Retinal breaks may be obscured by opacities that are either anterior segment related, lens related, or posterior segment related. Rules to identify breaks based on subretinal fluid configuration are more difficult to apply in pseudophakic, aphakic, and scleral buckle encircled eyes-and in eyes with repeat detachments and those with proliferative vitreoretinopathy. Exudative detachments exhibit characteristic features and must be ruled out. A thorough clinical examination preoperatively is important even if a vitrectomy is planned. We review the incidence and causes of undetected breaks, along with preoperative/clinical issues that may hinder break detection. We review the literature with respect to investigative approaches and techniques that are available to the vitreoretinal surgeon when primary breaks remain clinically undetected during the preoperative examination. We broadly divide the surgical approaches into ones where the surgeon utilizes techniques to pursue actively a search for breaks versus adopting a purely speculative approach. Advantages and disadvantages of various techniques are appraised. Intuitively one might argue that an encircling scleral buckle combined with vitrectomy would give higher single operation success than pars plana vitrectomy alone because "undetected" retinal breaks would be addressed by a 360° plombage. We could not confirm this concept. Newer techniques, such as pars plana vitrectomy augmented with dye extrusion or endoscopic-assisted pars plana vitrectomy, show encouraging results. Technological advances such as intraoperative optical coherence tomography will also help to broaden the vitreoretinal surgeon's armamentarium. At this time, there is no gold standard in terms of the recommended

  17. Vitrectomy in double-perforation gunshot injury

    Directory of Open Access Journals (Sweden)

    Abd El Alim Mohamed A

    2013-11-01

    Full Text Available Ahmed Abd El Alim MohamedOphthalmology department, Ain Shams University, Cairo, EgyptObjective: This study sought to evaluate the result of pars plana vitrectomy in patients with gunshot wounds involving double perforation.Methods: This was a retrospective, noncomparative, interventional case series.Results: Eighteen patients (18 eyes with double-perforation gunshot injuries were treated from February 2010 to March 2012. The group included 16 men (88% and two women (11%; the mean age was 24 (15–33 years. In each case, vitrectomy was scheduled 1–6 weeks after repair of the entrance site. Associated retinal detachments were observed in two eyes (11%, retinal incarceration was observed surrounding the exit site in three eyes (16%, and retention of an intraocular foreign body was observed in two cases. After a follow-up period of 8 ± 2 months, two eyes (11% had achieved visual acuity (VA of 0.5, nine eyes (50% had achieved VA between 0.5 and 0.1, and seven eyes (38% had achieved VA between 0.1 and hand movement. The main reasons for functional failure (VA 0.1 to hand movement were macular dragging (due to fibrosis at the exit site near the macula in seven cases (38%, submacular hemorrhage in four cases (22%, and epimacular fibrosis in five cases (27%. All cases developed postoperative exotropia. One case (5% developed postoperative hemorrhage. No cases exhibited signs of postoperative redetachment.Conclusion: The outcome of pars plana vitrectomy in cases with double perforations is variable. Factors including the surgeon's skill level, the time to surgery, and the efficacy of the intraocular tamponade affect the postoperative outcome.Keywords: pars plana vitrectomy, gunshot injury, double perforation

  18. Multiple methods of surgical treatment combined with primary IOL implantation on traumatic lens subluxation/dislocation in patients with secondary glaucoma.

    Science.gov (United States)

    Wang, Rui; Bi, Chun-Chao; Lei, Chun-Ling; Sun, Wen-Tao; Wang, Shan-Shan; Dong, Xiao-Juan

    2014-01-01

    To describe clinical findings and complications from cases of traumatic lens subluxation/dislocation in patients with secondary glaucoma, and discuss the multiple treating methods of operation combined with primary intraocular lens (IOL) implantation. Non-comparative retrospective observational case series. 30 cases (30 eyes) of lens subluxation/dislocation in patients with secondary glaucoma were investigated which accepted the surgical treatment by author in the Ophthalmology of Xi'an No.4 Hospital from 2007 to 2011. According to the different situations of lens subluxation/dislocation, various surgical procedures were performed such as crystalline lens phacoemulsification, crystalline lens phacoemulsification combined anterior vitrectomy, intracapsular cataract extraction combined anterior vitrectomy, lensectomy combined anterior vitrectomy though peripheral transparent cornea incision, pars plana lensectomy combined pars plana vitrectomy, and intravitreal cavity crystalline lens phacofragmentation combined pars plana vitrectomy. And whether to implement trabeculectomy depended on the different situations of secondary glaucoma. The posterior chamber intraocular lenses (PC-IOLs) were implanted in the capsular-bag or trassclerally sutured in the sulus decided by whether the capsular were present. visual acuity, intraocular pressure, the situation of intraocular lens and complications after the operations. The follow-up time was 11-36mo (21.4±7.13). Postoperative visual acuity of all eyes were improved; 28 cases maintained IOP below 21 mm Hg; 2 cases had slightly IOL subluxation, 4 cases had slightly tilted lens optical area; 1 case had postoperative choroidal detachment; 4 cases had postoperative corneal edema more than 1wk, but eventually recovered transparent; 2 cases had mild postoperative vitreous hemorrhage, and absorbed 4wk later. There was no postoperative retinal detachment, IOL dislocation, and endophthalmitis. To take early treatment of traumatic lens

  19. Efficacy of vitrectomy with triamcinolone assistance versus internal limiting membrane peeling for highly myopic macular hole retinal detachment.

    Science.gov (United States)

    Wei, Yong; Wang, Ningli; Zu, Zhongqiao; Bi, Chuncao; Wang, Huaizhou; Chen, Fenghua; Yang, Xingguang

    2013-06-01

    To compare the outcomes of pars plana vitrectomy (PPV) with or without the adjuvant surgical procedures: triamcinolone acetonide (TA) assistance and/or internal limiting membrane (ILM) peeling for the treatment of highly myopic macular hole retinal detachment (MHRD). Case-control study. Pars plana vitrectomy combined with 2 kinds of adjuvant surgical procedures were used on 96 highly myopic eyes with MHRD. These eyes were assigned to 4 groups randomly: Group 1, non-TA-assisted PPV and without ILM peeling; Group 2, non-TA-assisted PPV with ILM peeling; Group 3, TA-assisted PPV and without ILM peeling; Group 4, TA-assisted PPV with ILM peeling. Anatomical reattachment of the retina, macular hole closure, and best-corrected visual acuity were measured. The rates of both retinal reattachment and macular hole closure were higher in Group 2 (84.0 and 44.0%) and Group 3 (80.8 and 46.2%) than Group 1 (73.9 and 17.4%); however, there were no differences between Group 2 and Group 3 (P > 0.05). The rates of macular hole closure were extremely low in Group 1 and also in eyes with extreme long axial lengths (≥29.0 mm), "severe" chorioretinal atrophy, and posterior staphyloma. Pars plana vitrectomy with either TA assistance or ILM peeling was effective for the treatment of highly myopic MHRD. If you peel the ILM, adding TA does not affect closure rates; and if TA is used to visualize the vitreous, ILM peeling may not be necessary in MHRD. There was a lower anatomical success rate in MHRD with extreme long axial lengths, severe chorioretinal atrophy, and posterior staphyloma.

  20. Outcomes in bullous retinal detachment

    Directory of Open Access Journals (Sweden)

    Sarah P. Read

    2017-06-01

    Conclusions and importance: GRTs are an uncommon cause of retinal detachment. While pars plana vitrectomy with tamponade is standard in GRT management, there is variability in the use of scleral buckling and PFO in these cases. This is in contrast to retinal dialysis where scleral buckle alone can yield favorable results. Though a baseball ocular trauma is common, retinal involvement is rare compared to other sports injuries such as those occurring with tennis, soccer and golf. Sports trauma remains an important cause of retinal injury and patients should be counseled on the need for eye protection.

  1. Lietuvos paslaugų įmonės internacionalizacija Norvegijos rinkoje

    OpenAIRE

    Rasikas, Rokas

    2011-01-01

    Baigiamojo darbo tikslas - išsiaiškinti ar bendrovės idėja teikti įdarbinimo paslaugas Lietuvos piliečiams Norvegijoje būtų reali, perspektyvi, o svarbiausia – pelninga veikla. Teorinėje darbo dalyje analizuojami - paslaugų marketingo ypatumai, paslaugų marketingo strategijos, paslaugų marketingo veiksmų planas, internacionalizacijos aiškinimai, skverbimosi i užsienio rinkas fazės. Analitinėje baigiamojo darbo dalyje atlikti tyrimai ir rezultatai - išanalizuota Norvegijos makroaplinka, šalies...

  2. Periodismo virtual

    Directory of Open Access Journals (Sweden)

    Carlos Morales

    2015-01-01

    Full Text Available El periodismo virtual se produce en diarios que no ofrecen noticias (concebidas como versión o reflejo de la realidad sino que crean sus propias ficciones, especialmente en primeras planas. El autor del artículo señala que esto esta sucediendo en LA NACIÓN de San José de Costa Rica, diario premiado por la inefable Sociedad Interamericana de Prensa - SIP - y periódico económicamente más importante del país.

  3. A list of image files of planarians analyzed by in situ hybridication and immunohistochemical staining - Plabrain DB | LSDB Archive [Life Science Database Archive metadata

    Lifescience Database Archive (English)

    Full Text Available List Contact us Plabrain DB A list of image files of planarians analyzed by in situ hybridication and immunohistochemical...tu hybridication and also protein distribution by immunohistochemical staining in intact planarians or plana...planarians analyzed by In situ hybridication and immunohistochemical staining . D..._image#en Data acquisition method Whole-mount in situ hybridication, immunohistochemical...te Policy | Contact Us A list of image files of planarians analyzed by in situ hybridication and immunohistochemical staining - Plabrain DB | LSDB Archive ...

  4. Macular hole-associated retinal detachment in Best vitelliform dystrophy: Series of two cases and literature review

    Science.gov (United States)

    Tewari, Ruchir; Kumar, Vinod; Ravani, Raghav; Dubey, Devashish; Chandra, Parijat; Kumar, Atul

    2018-01-01

    Two eyes of 2 patients with macular hole-associated retinal detachment in clinically diagnosed vitelliruptive stage of Best vitelliform dystrophy were surgically managed by 25-gauge sutureless pars plana vitrectomy, internal limiting membrane (ILM) peeling with inverted ILM flap, and short-acting (SF6) gas tamponade. The patients were assessed with respect to best-corrected visual acuity, color fundus photographs, shortwave fundus autofluorescence, and swept source optical coherence tomography. Surgical intervention led to Type 1 closure of macular hole, resolution of retinal detachment, and improvement in vision in both patients. PMID:29676326

  5. Estudos qu?micos dos compostos heteroc?clicos mesoi?nicos e sua potencialidade antif?ngica.

    OpenAIRE

    Souza, Helivaldo Diogenes da Silva

    2012-01-01

    Entre os compostos da classe heteroc?clica, os mesoi?nicos s?o beta?nas heteroc?clicas planas e n?o arom?ticas estabilizadas por deslocaliza??o de el?trons. Apresentam propriedades que podem ser aplicadas na ?rea de cristais l?quidos, ?ptica n?o-linear e principalmente na ?rea de desenvolvimentos de novos f?rmacos, uma vez que esses compostos possuem um amplo espectro de atividades biol?gicas tais como: antibacteriana, antitumoral, antif?ngica, antimal?rica, analg?sica, a...

  6. El sitio de instalación de la Estación Científica Ecuatoriana en la Antártida

    OpenAIRE

    Horn, H.; Arrellano, H.

    1990-01-01

    La Punta Fort Williams, en la Isla Greenwich, fue el lugar seleccionado por el Programa Antártico Ecuatoriano para la construcción de la Estación Científica "Pedro Vicente Maldonado", proyecto que representa la decisión del Estado Ecuatoriano por incorporar la región Antártica al quehacer científico nacional. La estación, de tipo modular, está localizada en una plataforma plana y reciente, de terreno suelto a una altitud de 20 metros aproximadamente, constituida de sedimentos consolidados ...

  7. Proyecto constructivo de las obras de protección y/o encauzamiento para el proyecto PLISA

    OpenAIRE

    De Sicart Xiberta, Alvaro-Carlos

    2013-01-01

    San Antonio es una comuna chilena que cuenta con uno de los puertos con mayor potencial del país, con intención de transformarse en el puerto número uno de Chile. El estudio de demanda muestra la inminente saturación de la capacidad de gestión de TEUs del puerto. La Empresa Portuaria prevé la ampliación de las instalaciones del mismo puerto. Además, se constata que al sur del puerto, existe una zona morfológicamente plana, sin accidentes topográficos, que presenta evidentes ...

  8. Estudio del rechazo de especies iónicas en procesos de nanofiltración

    OpenAIRE

    Marín Daniel, Miguel

    2013-01-01

    En este proyecto se estudia la modelización del transporte de especies iónicas (concretamente fosfatos y carbonatos) a través de membranas planas de nanofiltración (NF), en procesos de potabilización de aguas salobres. El fin de la investigación es la aplicación y validación de un modelo matemático predictivo del comportamiento de iones en disolución cuando se trabaje con una membrana de NF. Las pruebas experimentales se realizan en una planta piloto, a escala de laboratorio, compuesta ...

  9. Method to determine full work of fracture from disk shaped compact tension tests on hot-mix asphalt

    CSIR Research Space (South Africa)

    Denneman, E

    2010-08-01

    Full Text Available crack through the entire ligament area will not be recorded. The missing part of the exponential tail of the load-CMOD curve can be modelled using the methodology provided in this paper. The results indicate that 12.6 per cent of the fracture energy... for Earthquake Engineering Simulation v1.7.5. Berkeley: Pacific Earthquake Engineering Research Center, University of California. Rocco, C., Guinea, G., Planas, J., Elices, M., 1999a. Size effect and boundary conditions in the Brazilian test: Experimental...

  10. Teater jääb Pärnus sõnatuks / Tiit Tuumalu

    Index Scriptorium Estoniae

    Tuumalu, Tiit, 1971-

    2008-01-01

    Pärnus 29.-30. märtsini toimuvast 1. rahvusvahelisest sõnadeta teatri konkursist "C.o.n.t.est 08" ja selles osalejatest - Kristine Kyhl Andersen (Taani) "Mego - soolo assistendiga nr3", Etcha Dvornik (Sloveenia-Prantsusmaa) "Alpid! Alpid!", Mihkel Ernits "Nimetu", Ferenc Fehér "Sirzamanze", Cristina Planas Leitó (Portugal-Holland) "Nülitud", Anna Melnikova (Venemaa-Saksamaa) "Kolmekordne", Mariela N4estora (Kreeka) "Fopaa", Sonja Oien Salkowitsch (Norra-Saksamaa) "Külm", Asako Shirai (Jaapan) "Viimane". Kommenteerib festivali peakorraldaja Teet Kask

  11. Análise da passividade e adaptação de infraestruturas de Ti com soldagem a laser vertical e horizontal de borda, cilindro cimentado ou processo CAD/CAM

    OpenAIRE

    Maíra Daysê Moreira Serra e Silva

    2013-01-01

    Resumo: Este estudo comparou diferentes técnicas para obtenção de infraestruturas protéticas implantossuportadas com menores desajustes verticais e melhor passividade. A partir de uma matriz metálica com paredes planas e dimensões de altura, comprimento e espessura de 25 X 70 X 10 mm, contendo 4 análogos de microunits (3,75 X 13 mm), foram confeccionadas 25 amostras separadas em cinco grupos (n=5): Grupo IM infraestruturas fundidas em monobloco; Grupo ISS infraestruturas fundidas seccionadas ...

  12. Construção e avaliação térmica de um fogão solar tipo caixa

    OpenAIRE

    Moura, Johnson Pontes de

    2007-01-01

    O presente trabalho apresenta uma contribuição no estudo de modelagens de transferência de calor para os alimentos submetidos aos testes experimentais no forno solar proposto, onde foi avaliada a melhor modelagem para o bife de frango em estudo, comparando os resultados, considerando este alimento como um objeto semi-infinito (1o modelo proposto) e, em seguida, considerou o bife de frango como uma placa plana em regime transiente em duas condições distintas: não considerando e outro modelo...

  13. Determinación del centro de esfuerzo en un troquel de corte utilizando un programa CAD

    OpenAIRE

    BALDI DE COSTA, CLARA

    2006-01-01

    Se discute la importancia de la correcta ubicación del centro de esfuerzo en un troquel de corte para minimizar las cargas laterales sobre los , elementos de guía. Se describe el proceso matemático para determinar el centro de esfuerzo a través del cálculo del centroide de una curva, y sucesivamente se proporciona un método de aproximación que utiliza la capacidad de AutoCAD de calcular el centroide de una región plana bidimensional. The importance of a correct positioning of the force cen...

  14. Proyecto de nave para fabricación de pinturas al agua

    OpenAIRE

    Pinto Pareja, Juan Carlos

    2016-01-01

    Se pretende la construcción de una nave industrial con la actividad de fabricación de pinturas al agua, sobre una parcela situada en el polígono industrial de Pelagatos, en Chiclana de la Frontera. La parcela dispone de una superficie de 1000 metros cuadrados, con una fachada de 20 metros y un fondo de 50 metros. La parcela es plana en general. Debe construirse la superficie máxima que permita el Plan General de Ordenación Urbana. Se dispondrán en planta baja las siguientes dep...

  15. Análisis Geotécnico y Propuesta de cimentaciones sobre Rellenos en la Zona Nor - Oeste de la Ciudad de Juliaca

    OpenAIRE

    Cruz Calapuja, Néstor Alejandro

    2016-01-01

    La ciudad de Juliaca, cuenta con una topografía extremadamente plana, lo que origina estancamiento de agua que forma grandes humedades, en diversos lugares de la ciudad. Una de ellas se ubica, por la urbanización residencial Villa Médica. Esta superficie donde se tenía estancamiento de agua y en tiempos de sequía humedales, han sido rellenados, para sobre ellos efectuar construcciones de viviendas. La urbanización Villa Médica, es una de ellas, son módulos básicos construidos de un piso ...

  16. La sedimentación salina actual en las lagunas de La Mancha: una síntesis.

    OpenAIRE

    Peña Zarzuelo, Antonio de la; Marfil, R.

    1986-01-01

    [ES] La Mancha es una región natural de más de 30.000 Km2, caracterizada por una topografía extraordinariamente plana y un clima de tipo semiárido (Cuadro 1, Fig. 2), en la que existen numerosas lagunas salinas (Fig. 1), la mayoría de las cuales, por su régimen anual, pueden ser consideradas como «playa-lakes» (Fig. 3). Desde el punto de vista hidroquimico sus salmueras están integradas por: a) aniones: SO4 y Cl, con CO3 y CO 3H subordinados, y b) cationes: Mg 2+ y ...

  17. Cartografía minera

    OpenAIRE

    Estruch Serra, Miguel

    2001-01-01

    Bibliografia El principal objetivo de este libro es proporcionar todos los conocimientos sobre procedimientos topográficos y cartográficos, antiguos y actuales, utilizados en España por el Instituto Geográfico Nacional y por el Servicio Geográfico del Ejército. Todos los trabajos relacionados con la transformación de coordenadas geodésicas en planas y viceversa, en las distintas proyecciones cartográficas, son largos y engorrosos. Es por ello que se incluyen una serie de programas para cal...

  18. INTERMOLECULAR ENERGY AND SURFACE TENSION IN PURE NON AUTOASSOCIATED LIQUIDS

    Directory of Open Access Journals (Sweden)

    Gabriel Hernández de la Torre

    2010-08-01

    Full Text Available Se deduce una ecuación para calcular la energía libre en la superficie de un líquido, como una función de las densidades ortobáricas. Se considera la contribución molecular al área de la superficie de moléculas globulares, moléculas planas y parafinas normales y se calcula la tensión superficial para las especies anteriores. Los valores calculados de la tensión superficial presentan excelente concordancia con los valores experimentales.

  19. Il vaso e i cocci. Note in margine a La llegenda del llibreter assassí de Barcelona

    Directory of Open Access Journals (Sweden)

    Francesco de Cristofaro

    2013-12-01

    Full Text Available Il contributo discute alcune questioni legate, in modo più o meno tangenziale, a La llegenda del llibreter assassí de Barcelona: dopo aver sottoposto il libro di Ramon Miquel i Planas alle domande, di metodo e di merito, presenti in un affine e più recente “giallo filologico” (il saggio di Alberto Varvaro sulla vicenda della baronessa di Carini, e dopo essersi interrogato circa il filone paraletterario delle cosiddette “Cause celebri” e circa una declinazione naturalista e straniante della letteratura processuale (il dittico di Galdós Realidad-Incógnita, il discorso si sposta su di un aspetto più prettamente storico-culturale e tematico quale l’intreccio fra bibliomania e cleptomania (soprattutto in Flaubert. L’articolo si conclude con una rapida ricognizione dei plagi letterari realizzati da Nodier, il presunto colpevole del falso da cui si diparte tutta la genealogia indagata da Miquel i Planas: un colpevole che, proprio mentre si macchia di molteplici crimini letterari, dedica loro un sofisticato trattato giurisprudenziale, in cui sistematizza e stigmatizza quegli stessi crimini This essay seeks to investigate tangentially some questions regarding La llegenda del llibreter assassí de Barcelona: after having analyzed the approaches, methods and strategies –that Alberto Varvaro has thoroughly examined in the essay on Baroness di Carini’s story–, and the literary quality achieved by Ramon Miquel i Planas in his work; and after having probed the paraliterary line of the so-called “famous trials” –mostly focusing on the naturalistic estrangement effect produced by literature works related to legal cases (e.g. the conventional diptych in Galdós’s Realidad-Incógnita–, the centre of attention shifts on the cultural, historical aspects of the bizarre relationship between kleptomania and bibliomania (especially in Flaubert. The article concludes with a swift overview of literary plagiarisms committed by Nodier, the

  20. Bilateral Simultaneous Rhegmatogenous Retinal Detachment following Laser in situ Keratomileusis

    Directory of Open Access Journals (Sweden)

    Erhan Yumusak

    2016-06-01

    Full Text Available A 21-year-old woman developed simultaneous rhegmatogenous retinal detachment after laser in situ keratomileusis (LASIK in both eyes. She underwent pars plana vitrectomy surgery combined with endolaser photocoagulation and silicone oil tamponade in the right eye. A week later, pneumatic retinopexy was done in the left eye. As the retinal tear did not seal, 360° scleral buckling surgery was performed and retina was attached. Bilateral simultaneous rhegmatogenous retinal detachment after LASIK for correction of myopia can be a serious complication. Patients should be informed about the possibility of this complication.

  1. Retinal detachment following endophthalmitis.

    Science.gov (United States)

    Nelsen, P T; Marcus, D A; Bovino, J A

    1985-08-01

    Fifty-five consecutive patients with a clinical diagnosis of bacterial endophthalmitis were reviewed. All patients were treated with systemic, periocular, topical, and intravitreal antibiotics. In addition, 33 of the patients underwent a pars plana vitrectomy. Nine retinal detachments occurred within six months of initial diagnosis. The higher frequency of retinal detachment in the vitrectomy group (21%) as compared to those patients managed without vitrectomy (9%) may be explained by a combination of surgical complications and the increased severity of endophthalmitis in the vitrectomy group. The two patients who developed retinal detachment during vitrectomy surgery rapidly progressed to no light perception. Conversely, the repair of retinal detachments diagnosed postoperatively had a good prognosis.

  2. Evaluación de la aplicabilidad de la técnica de la termografía infrarroja al reconocimiento del estado de elementos de hormigón

    OpenAIRE

    Guerrero Mena, Cely Natali

    2013-01-01

    El siguiente trabajo de investigación tiene como objetivo fundamental evaluar la capacidad que posee la técnica de la termografía infrarroja para detectar y reconocer anomalías, defectos y lesiones que originan procesos de deterioro en superficies planas de hormigón. Actualmente, el uso extensivo del hormigón como material de construcción hace oportuno la utilización de técnicas de inspección que permitan su correcto monitoreo y mantenimiento para la gestión y administración...

  3. Noor ja tahvuslik nüüdistants rahvusvahelisel võistlusel "C.O.N.T.EST '08" / Nele Suisalu

    Index Scriptorium Estoniae

    Suisalu, Nele

    2008-01-01

    Pärnus 29.-30. märtsini toimunud 1. rahvusvahelisest sõnadeta teatri konkursist "C.o.n.t.est 08". Selles osalejatest - Kristine Kyhl Andersen (Taani) "MEGO - assistendiga soolo nr3", Etcha Dvornik (Sloveenia-Prantsusmaa) "Alpid! Alpid!", Mihkel Ernits "Pealkirja veel ei ole", Ferenc Fehér "Sirzamanze", Cristina Planas Leitao (Portugal-Holland) "Nülitud", Anna Melnikova (Venemaa-Saksamaa) "Kolmekordne", Mariela Nestora (Kreeka) "Faux pas", Sonja Salkowitsch (Norra-Saksamaa) "Külm", Asako Shirai (Jaapan) "Viimane inimolend"

  4. Diabetic Macular Edema.

    Science.gov (United States)

    Gundogan, Fatih C; Yolcu, Umit; Akay, Fahrettin; Ilhan, Abdullah; Ozge, Gokhan; Uzun, Salih

    2016-01-01

    Diabetic macular edema (DME), one the most prevalent causes of visual loss in industrialized countries, may be diagnosed at any stage of diabetic retinopathy. The diagnosis, treatment, and follow up of DME have become straightforward with recent developments in fundus imaging, such as optical coherence tomography. Laser photocoagulation, intravitreal injections, and pars plana vitrectomy surgery are the current treatment modalities; however, the positive effects of currently available intravitreally injected agents are temporary. At this point, further treatment choices are needed for a permanent effect. The articles published between 1985-2015 years on major databases were searched and most appropriate 40 papers were used to write this review article.

  5. Evolución de los principales periódicos digitales latinoamericanos de información general desde comienzos del tercer milenio (2000-2007): caso: Argentina, Chile, Colombia, México y Venezuela

    OpenAIRE

    Hernández Soto, Tatiana

    2010-01-01

    En América Latina los periódicos que han incursionado en la Red han adoptado la llamada “metáfora del diario impreso”, es decir, una página principal o Home Page5 que emula a la primera plana y cuyos titulares, llamadas e índices, permiten ir avanzando en niveles de profundidad y detalle. Un gran número de diarios latinoamericanos viene desarrollando valiosas experiencias en beneficio de un mayor contacto interactivo con el lector. Es por ello, que se analizarán las versiones digitales de los...

  6. An approach to the intermolecular energy in pure liquids

    Directory of Open Access Journals (Sweden)

    GAbriel Hernández de la Torre

    2010-07-01

    Full Text Available Se propone un método para: estimar la energía potencial de repulsión de cualquier molécula central como una función de las densidades ortobáricas en líquidos puros no auto asociados; estimar los parámetros necesarios para calcular la energía de dispersión de London; calcular los números de coordinación promedio, distancias intermoleculares de interacción, diámetros moleculares y de grupos; en moléculas globulares, moléculas planas y parafinas normales.

  7. Macular hole-associated retinal detachment in Best vitelliform dystrophy: Series of two cases and literature review

    Directory of Open Access Journals (Sweden)

    Ruchir Tewari

    2018-01-01

    Full Text Available Two eyes of 2 patients with macular hole-associated retinal detachment in clinically diagnosed vitelliruptive stage of Best vitelliform dystrophy were surgically managed by 25-gauge sutureless pars plana vitrectomy, internal limiting membrane (ILM peeling with inverted ILM flap, and short-acting (SF6 gas tamponade. The patients were assessed with respect to best-corrected visual acuity, color fundus photographs, shortwave fundus autofluorescence, and swept source optical coherence tomography. Surgical intervention led to Type 1 closure of macular hole, resolution of retinal detachment, and improvement in vision in both patients.

  8. Surgical management of retinal diseases: proliferative diabetic retinopathy and traction retinal detachment.

    Science.gov (United States)

    Cruz-Iñigo, Yousef J; Acabá, Luis A; Berrocal, Maria H

    2014-01-01

    Current indications for pars plana vitrectomy in patients with proliferative diabetic retinopathy (PDR) include vitreous hemorrhage, tractional retinal detachment (TRD), combined tractional and rhegmatogenous retinal detachment (CTRRD), diabetic macular edema associated with posterior hyaloidal traction, and anterior segment neovascularization with media opacities. This chapter will review the indications, surgical objectives, adjunctive pharmacotherapy, microincision surgical techniques, and outcomes of diabetic vitrectomy for PDR, TRD, and CTRRD. With the availability of new microincision vitrectomy technology, wide-angle microscope viewing systems, and pharmacologic agents, vitrectomy can improve visual acuity and achieve long-term anatomic stability in eyes with severe complications from PDR. © 2014 S. Karger AG, Basel

  9. EVALUATION OF THE IMPERFECTION EFFECTS ON THE BUCKLING LOADS OF STRUCTURES

    OpenAIRE

    WALTER MENEZES GUIMARAES JUNIOR

    1999-01-01

    Um procedimento simples, para a avaliação do aumento ou diminuição (sensibilidade) das cargas de flambagem estática ou dinâmica (flutter) de estruturas na presença de pequenas imperfeições geométricas, é apresentado. O modelo computacional considera estruturas planas elásticas modeladas por elementos de viga retos. Os sistemas de carregamento podem ser conservativos ou não- conservativos. A formulação matricial inclui as matrizes de rigidez elástica, de mass...

  10. Estudio experimental del empuje sobre estructuras de contención en suelos reforzados con geomallas Experimental study of the lateral earth pressure on retaining structures in soils reinforced with geogrids

    OpenAIRE

    Lissette Ruiz-Tagle; Felipe Villalobos

    2011-01-01

    Este artículo presenta un estudio experimental de la variación de las tensiones de empuje sobre una pared que soporta un suelo reforzado con geomallas. Para ello se utilizó un equipo diseñado y construido especialmente para ejecutar ensayos de empuje bajo condiciones de deformación plana. Se describe el equipo de ensayo y los instrumentos de medición, así como el suelo y la preparación de las muestras de arena y la geomalla utilizada. En la primera etapa de la investigación se ensayan muestra...

  11. Excellent outcome of Aspergillous endophthalmitis in a case of allergic bronchopulmonary aspergillosis

    Directory of Open Access Journals (Sweden)

    Balbir Khan

    2014-01-01

    Full Text Available While invasive aspergillosis occurs typically in severely immunocompromised patients, cases of surgical site infections have been reported in immunocompetent individuals. The purpose is to report an eye with post-operative Aspergillus endophthalmitis, which achieved a good visual outcome following early and aggressive treatment. A young patient, known case of allergic bronchopulmonary aspergillosis presented to us with post-cataract surgery endophthalmitis. He was treated with pars plana vitrectomy and intravitreal voriconazole and systemic itraconazole. The patient regained a vision of 20/30 with follow up of 2 years.

  12. La proposta gramatical del P. Lluís Fullana i Mira

    Directory of Open Access Journals (Sweden)

    Vicent Simbor Roig

    2015-10-01

    Full Text Available By studying step by step, from beginnig to end, Father Fullana's grammatical studies, Prof. Simbor offers the reader the possibility of following the ideological evolution of this outstanding Valencian grammarian during three main periods: A unitarian one (1902-1915, a secessionist one (1915-1932, and a final one (1932-1948, when, after being the first to accept and to sign the unitarian ortography of Castelló de la Plana, he seems to have closed the process by accepting P. Fabra's proposals.

  13. Primary anterior chamber intraocular lens for the treatment of severe crystalline lens subluxation.

    Science.gov (United States)

    Hoffman, Richard S; Fine, I Howard; Packer, Mark

    2009-10-01

    Subluxated cataractous and clear lenses are commonly treated by limbal or pars plana lensectomy followed by primary or secondary intraocular lens (IOL) implantation. Adjunctive capsular prosthetic devices have facilitated lens removal and IOL centration in these challenging cases but have also added complexity and potential complications to the procedure. Although crystalline lens extraction may be required to clear the visual axis in mild to moderate lens subluxations, we propose insertion of a primary anterior chamber IOL without lens extraction in severe subluxations when the eye is optically aphakic or can be made functionally aphakic following neodymium:YAG laser zonulysis. Two cases demonstrating this approach are presented.

  14. Aprendizaje sobre los límites al escalamiento: el cluster de la industria de televisores en México

    OpenAIRE

    Brito Laredo, Janette; Carrillo Viveros, Jorge

    2017-01-01

    Resumen: El objetivo de este trabajo fue determinar la evolución de la industria de televisores en Tijuana. La metodología para analizar el proceso de escalamiento industrial consistió en una comparación de dos momentos críticos de dicha industria: la evolución del televisor de tubo de rayos catódicos a los aparatos de pantalla plana, y una década más tarde los cambios en los modelos de negocio. El estudio se basó en dos encuestas y en entrevistas cualitativas. Los resultados comprueban que s...

  15. RESISTENCIA AL CORTE EN DISCONTINUIDADES CON DIFERENTES GRADOS DE RUGOSIDAD

    Directory of Open Access Journals (Sweden)

    Javier Fernando Camacho Tauta

    2009-01-01

    Full Text Available En esta investigación se realizaron ensayos triaxiales sobre rocas artifi ciales elaboradascon un mortero (arena, cemento y agua de diferente resistencia. Se incluyeron cilindros sin y con una discontinuidad orientada a 60° con respecto al eje horizontal y tres diferentes grados de rugosidad, (pulida plana, pulida ondulada y ondulada. Se determinaron los parámetros de resistencia de las probetas de mortero y se analizó la infl uencia de los diferentes grados de rugosidad utilizando el criterio de Barton, obteniendo el coefi ciente de rugosidad de la discontinuidad.

  16. Valsalva Retinopathy Associated with Sexual Activity

    Directory of Open Access Journals (Sweden)

    Khalid Al Rubaie

    2014-01-01

    Full Text Available A 54-year-old healthy male presented complaining of sudden loss of vision in the right eye. Initial visual acuity was counting fingers. The patient’s acute vision loss developed after sexual activity. Color fundus photos and fluorescein angiography were performed showing a large subinternal limiting membrane hemorrhage in the macular area. A 23-gauge sutureless pars plana vitrectomy with brilliant blue assisted internal limiting membrane peeling was performed with best-corrected visual acuity recovery to 20/50 at 6 months of followup.

  17. Ensambles de aves en agroecosistemas de la provincia de Buenos Aires: su relación con los patrones de uso de la tierra y las características del paisaje

    OpenAIRE

    Codesido, Mariano

    2010-01-01

    Entre enero de 2006 y enero de 2008 se estudió estacionalmente la estructura de los ensambles de aves en los agroecosistemas de las diferentes unidades ecológicas de la Región Pampeana comprendidas dentro de la provincia de Buenos Aires (Pampa Ondulada, Pampa Interior Plana, Pampa Interior Arenosa, Pampa Deprimida y Pampa Austral). Los objetivos generales de la tesis son: a) describir la estructura de los ensambles de aves terrestres de los agroecosistemas de la provincia de Buenos Aires, b) ...

  18. L’Epítome de Llorenç Tomàs, canceller del Principat de Catalunya (1705-1714). Un document fins ara desconegut sobre els precedents de la Guerra de Successió

    OpenAIRE

    Ballbé i Sans, Neus

    2006-01-01

    Estudi centrat en l’epítom escrit pel canceller de Catalunya durant el govern de Carles III i que explica, en primera persona, els fets esdevinguts a la plana de Vic abans de l’arribada de l’Arxiduc el 1705. Estudio centrado en el epítome escrito por el canciller de Cataluña durante el gobierno de Carlos III y que explica, en primera persona, los hechos ocurridos en el llano de Vic antes de la llegada del Archiduque en 1705. Study centered on the written epitome by the chancellor of Cat...

  19. Estimating suitable environments for invasive plant species across large landscapes: a remote sensing strategy using Landsat 7 ETM+

    Science.gov (United States)

    Young, Kendal E.; Abbott, Laurie B.; Caldwell, Colleen A.; Schrader, T. Scott

    2013-01-01

    The key to reducing ecological and economic damage caused by invasive plant species is to locate and eradicate new invasions before they threaten native biodiversity and ecological processes. We used Landsat Enhanced Thematic Mapper Plus imagery to estimate suitable environments for four invasive plants in Big Bend National Park, southwest Texas, using a presence-only modeling approach. Giant reed (Arundo donax), Lehmann lovegrass (Eragrostis lehmanniana), horehound (Marrubium vulgare) and buffelgrass (Pennisteum ciliare) were selected for remote sensing spatial analyses. Multiple dates/seasons of imagery were used to account for habitat conditions within the study area and to capture phenological differences among targeted species and the surrounding landscape. Individual species models had high (0.91 to 0.99) discriminative ability to differentiate invasive plant suitable environments from random background locations. Average test area under the receiver operating characteristic curve (AUC) ranged from 0.91 to 0.99, indicating that plant predictive models exhibited high discriminative ability to differentiate suitable environments for invasive plant species from random locations. Omission rates ranged from <1.0 to 18%. We demonstrated that useful models estimating suitable environments for invasive plants may be created with <50 occurrence locations and that reliable modeling using presence-only datasets can be powerful tools for land managers.

  20. Primary Succession on a Hawaiian Dryland Chronosequence.

    Directory of Open Access Journals (Sweden)

    Kealohanuiopuna M Kinney

    Full Text Available We used measurements from airborne imaging spectroscopy and LiDAR to quantify the biophysical structure and composition of vegetation on a dryland substrate age gradient in Hawaii. Both vertical stature and species composition changed during primary succession, and reveal a progressive increase in vertical stature on younger substrates followed by a collapse on Pleistocene-aged flows. Tall-stature Metrosideros polymorpha woodlands dominated on the youngest substrates (hundreds of years, and were replaced by the tall-stature endemic tree species Myoporum sandwicense and Sophora chrysophylla on intermediate-aged flows (thousands of years. The oldest substrates (tens of thousands of years were dominated by the short-stature native shrub Dodonaea viscosa and endemic grass Eragrostis atropioides. We excavated 18 macroscopic charcoal fragments from Pleistocene-aged substrates. Mean radiocarbon age was 2,002 years and ranged from < 200 to 7,730. Genus identities from four fragments indicate that Osteomeles spp. or M. polymorpha once occupied the Pleistocene-aged substrates, but neither of these species is found there today. These findings indicate the existence of fires before humans are known to have occupied the Hawaiian archipelago, and demonstrate that a collapse in vertical stature is prevalent on the oldest substrates. This work contributes to our understanding of prehistoric fires in shaping the trajectory of primary succession in Hawaiian drylands.

  1. Putative Aspergillus niger-induced oxalate nephrosis in sheep : clinical communication

    Directory of Open Access Journals (Sweden)

    C.J. Botha

    2009-05-01

    Full Text Available A sheep farmer provided a maize-based brewer's grain (mieliemaroek and bales of Eragrostis curvula hay to ewes and their lambs, kept on zero-grazing in pens. The 'mieliemaroek' was visibly mouldy. After 14 days in the feedlot, clinical signs, including generalised weakness, ataxia of the hind limbs, tremors and recumbency, were noticed. Six ewes died within a period of 7 days. A post mortem examination was performed on 1 ewe. The carcass appeared to be cachectic with mild effusions into the body cavities; mild lung congestion and pallor of the kidneys were observed. Microscopical evaluation revealed nephrosis and birefringent oxalate crystals in the renal tubules when viewed under polarised light. A provisional diagnosis of oxalate nephrosis with subsequent kidney failure was made. Amongst other fungi, Aspergillus niger was isolated from 'mieliemaroek' samples submitted for fungal culture and identification. As A. niger is known to synthesise oxalates, a qualitative screen to detect oxalic acid in the mieliemaroek and purified A. niger isolates was performed using high-performance liquid chromatography (HPLC. Oxalic acid was detected, which supported a diagnosis of soluble oxalate-induced nephropathy.

  2. Impacts of conservation tillage on the hydrological and agronomic performance of Fanya juus in the upper Blue Nile (Abbay river basin

    Directory of Open Access Journals (Sweden)

    H. H. G. Savenije

    2012-12-01

    Full Text Available Adoption of soil conservation structures (SCS has been low in high rainfall areas of Ethiopia mainly due to crop yield reduction, increased soil erosion following breaching of SCS, incompatibility with the tradition of cross plowing and water-logging behind SCS. A new type of conservation tillage (CT involving contour plowing and the construction of invisible subsoil barriers using a modified Maresha winged "subsoiler" is suggested as a means to tackle these problems as an integral part of the SCS. We investigated the effect of integrating the CT with SCS on the surface runoff, water-logging, soil loss, crop yield and plowing convenience. The new approach of conservation tillage has been compared with traditional tillage (TT on 5 farmers' fields in a high rainfall area in the upper Blue Nile (Abbay river basin. Test crops were wheat [triticum vulgare] and tef [eragrostis tef]. Farmers found CT convenient to apply between SCS. Surface runoff appeared to be reduced under CT by 48 and 15%, for wheat and tef, respectively. As a result, CT reduced sediment yield by 51 and 9.5%, for wheat and tef, respectively. Significantly reduced water-logging was observed behind SCS in CT compared to TT. Grain yields of wheat and tef increased by 35 and 10%, respectively, although the differences were not statistically significant apparently due to high fertility variations among fields of participating farmers. Farmers who tested CT indicated that they will continue this practice in the future.

  3. Herbaceous vegetation restoration potential and soil physical condition in a mountain grazing land of Eastern Tigray, Ethiopia

    Directory of Open Access Journals (Sweden)

    Gebrewahd Amha Abesha

    2014-06-01

    Full Text Available An existence of information in the form database and full knowledge of grazing land vegetation resources and trend over time is essential for management decisions. This study was conducted in Kiltew -Awelaelo, eastern Tigray, Ethiopia. The study aimed to investigate species composition and diversity of the herbaceous vegetation, and examine the physical soil condition of the grazing lands. A total of 45 quadrats measuring 20m×20m (400m2 were laid out in 15 sample sites from three corresponding land use types (i.e. ten year enclosure, five year enclosure and open grazing land. From each land use type five sites having three quadrats were investigated. Each quadrat was laid out at an interval of 400m in five parallel transects each 200m apart from other. To collect data of herbaceous and soil five randomly located 1m2 area each, was selected and marked, within each 400m2 sample quadrat of sample sites located along the main transect. There was significant (PBracharia sp., Bromus pectinatus, Chloris gayana, Cenchurs cilarias, chloris radiata, Cynodon dactylon, Dactyloctenium aegyptium, Digitaria Velutina, Eragrostis teniufolia, Lintonia nutans, Setaria pumila, Seteria verticillate, and Tragus racemosus all occurred frequently forming the major constituents of the sites. Therefore, regeneration from area enclosure can be on advocated practice for grazing lands rehabilitation.

  4. Panthaleus major /Duges/ of cereals in Bulgaria

    Directory of Open Access Journals (Sweden)

    V. Maneva

    2016-12-01

    Full Text Available Abstract. Until recently, Penthaleus major (Dugès has not been recognized as an economically significant pest for the cereal crops. After climatic changes, its population began to grow and inflict damages around the world. The aim of this study was to investigate its distribution in Bulgaria and establish whether it presents a danger to the cereal crops. In the autumn of 2015 and the spring of 2016, a monitoring survey was conducted to establish Penthaleus major (Dugès with the cereal crops in Bulgaria. Over 60 sowed fields were investigated from all around the country. Samples were taken to identify the pest. It was established that Penthaleus major (Dugès inflicted harm to the wheat in north-eastern (12-14 mites per stem and south-eastern Bulgaria (6-8 mites per stem. Its density was under the threshold of economic harm. There was not found infestation of barley, rye, oat and triticale. On the field boundaries bordering the areas attacked by the mite were reported the following weeds: Capsella bursa pastoris (L. Medic, Descurania sophia (L. Welb. et Berth, Senecio spp., Sisymbrium orientale Torn., Taraxsacum officinale Weber, Anthemis spp., Bromus arvensis L., Eragrostis pilosa (L. P.B. Lolium temulentum L., which can be habitat for Penthaleus major (Dugès.

  5. Establishment of three new genera in the family Geminiviridae: Becurtovirus, Eragrovirus and Turncurtovirus

    KAUST Repository

    Varsani, Arvind

    2014-03-22

    The family Geminiviridae includes plant-infecting circular single-stranded DNA viruses that have geminate particle morphology. Members of this family infect both monocotyledonous and dicotyledonous plants and have a nearly global distribution. With the advent of new molecular tools and low-cost sequencing, there has been a significant increase in the discovery of new geminiviruses in various cultivated and non-cultivated plants. In this communication, we highlight the establishment of three new genera (Becurtovirus, Eragrovirus and Turncurtovirus) to accommodate various recently discovered geminiviruses that are highly divergent and, in some cases, have unique genome architectures. The genus Becurtovirus has two viral species, Beet curly top Iran virus (28 isolates; leafhopper vector Circulifer haematoceps) and Spinach curly top Arizona virus (1 isolate; unknown vector), whereas the genera Eragrovirus and Turncurtovirus each have a single assigned species: Eragrostis curvula streak virus (6 isolates; unknown vector) and Turnip curly top virus (20 isolates; leafhopper vector Circulifer haematoceps), respectively. Based on analysis of all of the genome sequences available in public databases for each of the three new genera, we provide guidelines and protocols for species and strain classification within these three new genera. © 2014 Springer-Verlag Wien.

  6. Establishment of three new genera in the family Geminiviridae: Becurtovirus, Eragrovirus and Turncurtovirus

    KAUST Repository

    Varsani, Arvind; Navas-Castillo, Jesú s; Moriones, Enrique; Herná ndez-Zepeda, Cecilia; Idris, Ali; Brown, Judith K.; Murilo Zerbini, F.; Martin, Darren Patrick

    2014-01-01

    The family Geminiviridae includes plant-infecting circular single-stranded DNA viruses that have geminate particle morphology. Members of this family infect both monocotyledonous and dicotyledonous plants and have a nearly global distribution. With the advent of new molecular tools and low-cost sequencing, there has been a significant increase in the discovery of new geminiviruses in various cultivated and non-cultivated plants. In this communication, we highlight the establishment of three new genera (Becurtovirus, Eragrovirus and Turncurtovirus) to accommodate various recently discovered geminiviruses that are highly divergent and, in some cases, have unique genome architectures. The genus Becurtovirus has two viral species, Beet curly top Iran virus (28 isolates; leafhopper vector Circulifer haematoceps) and Spinach curly top Arizona virus (1 isolate; unknown vector), whereas the genera Eragrovirus and Turncurtovirus each have a single assigned species: Eragrostis curvula streak virus (6 isolates; unknown vector) and Turnip curly top virus (20 isolates; leafhopper vector Circulifer haematoceps), respectively. Based on analysis of all of the genome sequences available in public databases for each of the three new genera, we provide guidelines and protocols for species and strain classification within these three new genera. © 2014 Springer-Verlag Wien.

  7. REVISIÓN DE LAS ESPECIES DEL GÉNERO SPOROBOLUS (POACEAE: CHLORIDOIDEAE: SPOROBOLINAE DEL NOROESTE DE SUDAMÉRICA: PERÚ, ECUADOR, COLOMBIA Y VENEZUELA

    Directory of Open Access Journals (Sweden)

    Giraldo-Cañas Diego

    2009-06-01

    Full Text Available Se presenta un estudio taxonómico de las especies de Sporobolus para el noroeste de Sudamérica. Se reconocen once especies para el área de estudio. Se incluyen las claves para determinar las especies así como las descripciones morfológicas y sus ilustraciones. Se discuten para cada una de las especies sus relaciones morfológicas, su distribución geográfica y sus preferencias ecológicas; adicionalmente, se relacionan sus usos y sus nombres comunes. Asimismo, se propone la lectotipificación para Sporobolus lasiophyllus Pilg. Por otra parte, se registran tres especies por primera vez para Colombia [Sporobolus pilifer (Trin. Kunth, Sporobolus tenuissimus (Mart. ex Schrank Kuntze y Sporobolus virginicus (L. Kunth]. Se excluyen de este tratamiento a Sporobolus brasiliensis (Raddi Hack. (=Eragrostis airoides Nees y Sporobolus domingensis (Trin. Kunth. Adicionalmente, se propone la adopción y la unificación de algunos términos morfológicos en agrostología, tales como caña, panoja, espiguilla, lema, antecio y cariopsis, en lugar de culmo, panícula, espícula, lemma, flósculo y cariopse-cariópside, respectivamente.

  8. Switchgrass, Bermudagrass, Flaccidgrass, and Lovegrass biomass yield response to nitrogen for single and double harvest

    International Nuclear Information System (INIS)

    Aravindhakshan, Sijesh C.; Epplin, Francis M.; Taliaferro, Charles M.

    2011-01-01

    Switchgrass (Panicum virgatum) has been identified as a model dedicated energy crop species. After a perennial grass is established, the major variable costs are for nitrogen (N) fertilizer and harvest. Prior to establishing switchgrass on millions of ha in a particular agro-climatic region, it would be useful to determine switchgrass yield response to N and its response to harvest frequency relative to alternative grass species. The objective of this research is to determine biomass yield response to N for four perennial grass species and to determine the species, N level, and harvest frequency that will maximize expected net returns, given the climate and soils of the U.S.A. Southern Plains. Yield data were produced in an experiment that includes four species (switchgrass, bermudagrass (Cynodon dactylon), weeping lovegrass (Eragrostis curvula), and carostan flaccidgrass (Pennisetum flaccidum)), four N levels, and two harvest levels. Linear response plateau (LRP), linear response stochastic plateau (LRSP), and quadratic response (QR) functions are estimated. For all combinations of biomass and N prices considered, the optimal species is switchgrass. For most price situations, it is economically optimal to fertilize established stands of switchgrass with 69 kg N ha -1 yr -1 and to harvest once yr -1 after senescence.

  9. Switchgrass, Bermudagrass, Flaccidgrass, and Lovegrass biomass yield response to nitrogen for single and double harvest

    Energy Technology Data Exchange (ETDEWEB)

    Aravindhakshan, Sijesh C.; Epplin, Francis M. [Department of Agricultural Economics, Oklahoma State University, Stillwater, OK 74078-6026 (United States); Taliaferro, Charles M. [Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078 (United States)

    2011-01-15

    Switchgrass (Panicum virgatum) has been identified as a model dedicated energy crop species. After a perennial grass is established, the major variable costs are for nitrogen (N) fertilizer and harvest. Prior to establishing switchgrass on millions of ha in a particular agro-climatic region, it would be useful to determine switchgrass yield response to N and its response to harvest frequency relative to alternative grass species. The objective of this research is to determine biomass yield response to N for four perennial grass species and to determine the species, N level, and harvest frequency that will maximize expected net returns, given the climate and soils of the U.S.A. Southern Plains. Yield data were produced in an experiment that includes four species (switchgrass, bermudagrass (Cynodon dactylon), weeping lovegrass (Eragrostis curvula), and carostan flaccidgrass (Pennisetum flaccidum)), four N levels, and two harvest levels. Linear response plateau (LRP), linear response stochastic plateau (LRSP), and quadratic response (QR) functions are estimated. For all combinations of biomass and N prices considered, the optimal species is switchgrass. For most price situations, it is economically optimal to fertilize established stands of switchgrass with 69 kg N ha{sup -1} yr{sup -1} and to harvest once yr{sup -1} after senescence. (author)

  10. Seawater: an alternative grassy weed control method for post emergence herbicides in tropical turfgrass

    International Nuclear Information System (INIS)

    Uddin, M.K.; Ismail, M.R.; Juraimi, A.S.; Hamdani, S.A.

    2014-01-01

    Research was designed to reduce herbicide use by replacing post emergence herbicides with readily available sea water to control tropical turfgrass weeds. In studies evaluating the use of saline solutions for weed control, four salinity levels (0, 24, 48 and 72 dS m/sup -1/) were applied once to 30 grassy weed species, along with seashore paspalum (Paspalum vaginatum Swartz) (as a control) during December, 2007 to March, 2008. The results on injury ratings for salt tolerant weeds were categorized as highly susceptible, moderately susceptible and extremely tolerant. C. dactylon, E. indica, E. virescense, E. unioloides and I. globosa were very susceptible and found to be effectively controlled (100%) at 72 dS m/sup -1/ salinity treatment. However, two most serious weeds viz. wiry eragrostis (E. atrovirens) and lesser dropseed (S. diander), were found to be extremely tolerant, and were not controlled even at the highest salinity level of 72 dS m/sup -1/. P. vaginatum and E. atrovirens did not show significant decrease in shoot and root dry weight at highest salinity levels (72 dS m/sup -1/). The results indicate that sea water has excellent potential for sustainable control of several common grassy weeds in tropical turf. (author)

  11. [Succession pattern of artificial vegetation community and its ecological mechanism in an arid desert region].

    Science.gov (United States)

    Xu, Cailin; Li, Zizhen

    2003-09-01

    Focusing on the artificial vegetation protection system of the Shapotou section of Baotou-Lanzhou railway in the arid desert region of China, this paper examined the dynamics of dominant plant species and the succession pattern of artificial plant community in the process of establishing and developing regional artificial vegetation. It also studied the driving force and the ecologically intrinsic mechanism of the community succession. The results demonstrated that the species composition of the artificial vegetation dramatically changed after 40 years of succession, from original artificial plant community of shrub and semi-shrub to artificial-natural desert plant community with annual herb dominated. During the process of succession, the importance values of artificial shrubs, such as Caragana korshinskii and Hedysarum scoparius, decreased and gradually retreated from the artificial plant community, while the naturally multiplied annual herb, such as Eragrostis poaeoides, Bassia dasyphylla, Salsola ruthenica, Chloris virgata and etc., were presented one after another and gradually became dominant. Besides, Artemisia ordosica always played a key role in the community due to its ability of naturally sowing and self-replacement. This type of succession pattern was closely related to the shortage of precipitation resource in this region and the formation of soil crust which inhibited the reproduction of shrub and perennial herb with deep root systems. This study provided a theoretical ground for realizing persistent development of artificial plant community.

  12. Profiling of plants at petroleum contaminated site for phytoremediation.

    Science.gov (United States)

    Anyasi, Raymond Oriebe; Atagana, Harrison Ifeanyichukwu

    2018-03-21

    The paucity of information in the literature on the characteristics of plants that could be used for phytoremediation of petroleum hydrocarbons (PHC)-contaminated sites was the principal reason for this study. The aim of the study was to identify indigenous plants growing in PHC-impacted soil in Umuahia in eastern-Nigeria that have the ability to phytoremediate soils contaminated with hydrocarbons under tropical monsoon climate conditions. A total of 28 native plant species from different families growing in and around hydrocarbon-impacted soil in the vicinity of vandalized pipelines carrying petroleum products were collected and studied for their ability to grow in a hydrocarbon-impacted soil and remove the PHC from the impacted soil. Some of the plants demonstrated the ability to grow in soil with high levels of the total petroleum hydrocarbons (TPH), which shows that they may be tolerant to hydrocarbons in soil and could potentially phytoremediate a hydrocarbon-contaminated soil. Chromolaena odorata, Aspilia africana, Chloris barbata, Pasparlum vaginatum, Bryophyllum pinnatum, Paspalum scrobiculatum, Cosmos bipinnatus, Eragrostis atrovirens, Cyperus rotundus, and Uvaria chamae showed tendencies to phytoremediate contaminated soil. By using bioaccumulation coefficient (BAC) as a measure of phytoremediation, results showed that C. odorata, A. africana, and U. chamae demonstrated the highest potentials to phytodegrade hydrocarbons in soil.

  13. Major Vegetation Types of the Soutpansberg Conservancy and the Blouberg Nature Reserve, South Africa

    Directory of Open Access Journals (Sweden)

    Theo H.C. Mostert

    2008-10-01

    Full Text Available The Major Megetation Types (MVT and plant communities of the Soutpansberg Centre of Endemism are described in detail, with special reference to the Soutpansberg Conservancy and the Blouberg Nature Reserve. Phytosociological data from 442 sample plots were ordinated using a DEtrended CORrespondence ANAlysis (DECORANA and classified using TWo-Way INdicator SPecies ANalysis (TWINSPAN. The resulting classification was further refined with table-sorting procedures based on the Braun–Blanquet floristic–sociological approach of vegetation classification using MEGATAB. Eight MVT’s were identified and described as Eragrostis lehmanniana var. lehmanniana–Sclerocarya birrea subsp. caffra Blouberg Northern Plains Bushveld, Euclea divinorum–Acacia tortilis Blouberg Southern Plains Bushveld, Englerophytum magalismontanum–Combretum molle Blouberg Mountain Bushveld, Adansonia digitata–Acacia nigrescens Soutpansberg Arid Northern Bushveld, Catha edulis–Flueggia virosa Soutpansberg Moist Mountain Thickets, Diplorhynchus condylocarpon–Burkea africana Soutpansberg Leached Sandveld, Rhus rigida var. rigida–Rhus magalismontanum subsp. coddii Soutpansberg Mistbelt Vegetation and Xymalos monospora–Rhus chirendensis Soutpansberg Forest Vegetation.

  14. Generalized seizures and transient contralateral hemiparesis following retrobulbar anesthesia: a case report.

    Science.gov (United States)

    Dettoraki, Maria; Dimitropoulou, Chrisafoula; Nomikarios, Nikolaos; Moschos, Marilita M; Brοuzas, Dimitrios

    2015-07-28

    Retrobulbar block is a local anesthetic technique widely used for intraocular surgery. Although retrobulbar anesthesia is considered to be relatively safe, a number of serious adverse events have been reported. To our knowledge, immediate onset of generalized seizures with contralateral hemiparesis after retrobulbar anesthesia has not been reported. A 62-year-old Caucasian healthy male with a right eye retinal detachment was admitted for pars plana vitrectomy. During retrobulbar anesthesia with ropivacaine and before needle withdrawal, the patient developed twitching of the face which rapidly progressed to generalized tonic-clonic seizures. Arterial oxygen saturation decreased to 75 %. Chin lift was performed and 100 % oxygen was administrated via face mask, which increased saturation to 99 %. Midazolam 2 mg was administrated intravenously to control seizures. After cessation of seizures, left-sided hemiparesis was evident. Brain computed tomography and electroencephalogram were normal 3 h later. The patient underwent pars plana vitrectomy under general anesthesia 4 days later. Serious complications of local anesthesia for ophthalmic surgery are uncommon. We present a case in which generalized tonic-clonic seizures developed during retrobulbar anesthesia, followed by transient contralateral hemiparesis. The early onset of seizures indicated intra-arterial injection of the anesthetic. Our case suggested the need for close monitoring during the performance of retrobulbar anesthesia and the presence of well-trained personnel for early recognition and immediate management of the complications.

  15. Broadband planar antenna with improved pattern bandwidth

    Directory of Open Access Journals (Sweden)

    Carlos Suárez

    2012-01-01

    Full Text Available En este articulo se presenta el diseño de una antena plana F invertida que utiliza una geometria en la cual se dividen en dos partes las placas superior (radiante, de corto, de tierra y de excitación capacitiva. Mediante esta geometria y la técnica de excitación capacitiva se logra alcanzar anchos de banda de diagrama y de impedancia cercanos al 52.44% (1.66 GHz a 2.84 GHz Ydel 8% (3.36 GHz a 3.64 GHz para un VSWR <: 2.0. Los resultados medidos para estos parámetros son superiores a los obtenidos mediante la técnica tradicional de excitación directa con terminal u otros métodos de excitación capacitiva utilizado en antenas planas F invertidas (PIFA. El prototipo construido permite la operación simultanea de la antena en las bandas de Des 1800, Des 1900, UMTS, WiFi, 2.4GHz, WiMAX (2.3GHz a 2.5GHz y (3.4GHz a 3.5GHz y en la banda asignada para el estándar (Bluetootb. Los diagramas de radiación obtenidos dentro de estos anchos de banda son razonablemente omnidireccionales.

  16. ¿Neumodesplazamiento vigente? Uso en hemorragia subretiniana y agujero macular traumático

    Directory of Open Access Journals (Sweden)

    Gabriela Papa-Oliva

    2015-07-01

    Conclusiones: El trauma ocular representa todo un desafío para el oftalmólogo, en este caso producto de un trauma ocular contuso. Para la resolución de la hemorragia subretiniana producto de una rotura coroidea yuxtapapilar y del agujero macular traumático, tenemos varias opciones quirúrgicas que dependerán de la decisión del especialista en cuanto conocimiento, experiencia y experticia del mismo. El neumodesplazamiento sin vitrectomía vía pars plana ha sido utilizado para desplazar sangre subretiniana secundaria a degeneración macular relacionada con la edad. Usando el mismo principio pero aplicado a diferente patología, se decidió realizar desplazamiento neumático, obteniendo como resultado drenaje a cavidad vítrea de la hemorragia subretiniana y cierre del agujero macular. El neumodesplazamiento puede ser considerado una opción terapéutica eficaz versus la vitrectomía vía pars plana en el manejo de esta dolencia.

  17. MULTIVARIABLE ANALYSIS OF 2,4-D HERBICIDE PHOTOCATALYTIC DEGRADATION

    Directory of Open Access Journals (Sweden)

    ANDRÉS F. LÓPEZ-VÁSQUEZ

    2011-01-01

    Full Text Available La degradación del herbicida 2,4-D en suspensiones de TiO2 en agua real fue evaluada bajo condiciones de irradiación artificial. El análisis multivariable de metodología de superficie de respuesta (MSR, se aplicó para evaluar el efecto de variables como la concentración de catalizador y pesticida, el pH y el caudal volumétrico sobre la reacción fotocatalítica en dos fotorreactores catalíticos: placa plana y tubular. La variable de respuesta fue la mineralización del pesticida expresada como porcentaje de degradación de carbono orgánico total (COT después de cuatro horas de irradiación. Para el fotorreactor tubular, los cuatro factores tuvieron la misma significancia sobre la degradación, mientras que para el fotorreactor de placa plana inclinada, sólo la concentración de catalizador y el pH tuvieron significancia. La MSR fue una técnica adecuada para obtener parámetros de operación óptimos de un proceso fotocatalítico con un reactor específico y dentro de un rango de estudio determinado.

  18. Calcification of Hydrophilic Acrylic Intraocular Lenses With a Hydrophobic Surface: Laboratory Analysis of 6 Cases.

    Science.gov (United States)

    Gartaganis, Sotirios P; Prahs, Philipp; Lazari, Eftichia D; Gartaganis, Panos S; Helbig, Horst; Koutsoukos, Petros G

    2016-08-01

    To investigate the nature and characteristic features of deposits causing opacification of intraocular lenses (IOLs) based on the examination of clinical findings using scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDX) analysis. Retrospective, observational case series. This is a multicenter study of 6 hydrophilic acrylic IOLs (Lentis LS-502-1; Oculentis GmbH, Berlin, Germany) with a hydrophobic surface that were explanted from 5 patients because of opacification. Three patients had an uncomplicated phacoemulsification. One patient underwent combined phacoemulsification and pars plana vitrectomy for retinal detachment and later silicone oil endotamponade owing to redetachment. The last patient had a pars plana vitrectomy and silicone oil instillation combined with phacoemulsification for tractive retinal detachment and diabetic retinopathy. The explanted lenses were submitted to our laboratory and were examined by SEM and EDX in order to identify the morphologic features and the composition of the deposits. SEM and EDX analyses confirmed the presence of calcific deposits in the interior of the opacified hydrophilic IOLs, with a pattern showing the formation of lumps on the surface. The lumps were due to subsurface formation of calcium phosphate crystalline deposits. The crystallite clusters seemed to diffuse from the IOL interior to the surface. We demonstrated the calcification pattern of the hydrophilic IOL (Lentis LS-502-1) with a hydrophobic surface. Although hydrophilic acrylic lenses have a hydrophobic surface, the development of calcification is a possible threat initiating from the hydrophilic subsurface of the IOLs. Copyright © 2016 Elsevier Inc. All rights reserved.

  19. 27-GAUGE VITRECTOMY WOUND INTEGRITY: A Randomized Pilot Study Comparing Angled Versus Straight Entry in Fluid-Filled Vitrectomized Eyes.

    Science.gov (United States)

    Khan, M Ali; Durrani, Alia K; Hsu, Jason; Regillo, Carl D

    2018-04-01

    To compare clinical outcomes using angled versus straight trocar insertion during 27-gauge pars plana vitrectomy for epiretinal membrane. Pilot randomized controlled trial. Thirty eyes of 30 patients undergoing 27-gauge pars plana vitrectomy with membrane peeling for epiretinal membrane were randomized 1:1 to receive angled or straight trocar insertion. Intraocular pressure (IOP) and postoperative wound-related complications were compared. Fifteen eyes were randomized to each the angled and straight incision groups. No significant difference in phakic status (P = 0.71) or preoperative IOP (15.1 ± 3.4 vs. 14.6 ± 3.0 mmHg, P = 0.67) existed between groups. On postoperative Day 1, eyes in the straight group had lower IOP compared with the angled group (11.8 ± 3.9 vs. 15.3 ± 5.2 mmHg, P = 0.04) and a relative decrease in IOP compared with preoperative values (11.8 ± 3.9 vs. 15.1 ± 3.4 mmHg, P straight group) and serous choroidal detachment (1 eye, angled group). Eyes with straight incisions had transiently lower IOP on postoperative Day 1, possibly suggestive of subclinical wound leak in the very early postoperative period. Overall, rates of hypotony and sclerotomy-related complications were similarly low between wound construction strategies.

  20. Short-Acting Gas Tamponade with Strict Face-Down Posturing for the Treatment of Idiopathic Macular Hole.

    Science.gov (United States)

    Gotzaridis, Stratos; Liazos, Efstathios; Petrou, Petros; Georgalas, Ilias

    2017-01-01

    A retrospective consecutive case series to evaluate the safety and efficacy of 25 gauge pars plana vitrectomy, ILM peeling, 20% SF 6 gas tamponade and strict posturing for the treatment of idiopathic full-thickness macular holes. We report the results of 106 consecutive eyes that underwent standard 25-gauge pars plana vitrectomy, brilliant peel-assisted internal limiting membrane peel, fluid:gas exchange with 20% SF 6 and strict posturing for one week. All patients were followed up at one week, one month, three months, and nine months postoperatively. Biomicroscopy at day 1 and biomicroscopy and OCT at week 1, months 1, 3, and 9 were used to assess macular hole status postoperatively. Pre- and postoperative logMAR visual acuity was compared. The macular hole was closed in 102/106 eyes postoperatively (96.2%). Four eyes showed unclosed macular holes and underwent additional SF 6 intravitreal injection and strict posturing for 10 days. All macular holes were eventually closed without the need of a second surgical procedure. Mean visual acuity improved from 0.63 logMAR preoperatively to 0.39 logMAR postoperatively. One case of retinal toxicity was reported due to accidental intravitreal injection of antibiotic. 25-gauge vitrectomy, ILM peel, and short-acting gas tamponade are highly effective for the treatment of macular holes. Additional intravitreal gas injection followed by strict posturing seems to be a simple and effective treatment for unclosed holes.

  1. Combined 23-gauge transconjunctival vitrectomy and scleral fixation of intraocular lens without conjunctival dissection in managing lens complications.

    Science.gov (United States)

    Yeung, Ling; Wang, Nan-Kai; Wu, Wei-Chi; Chen, Kuan-Jen

    2018-04-23

    To evaluate the safety and efficacy of combined 23-gauge transconjunctival pars plana vitrectomy and scleral fixation of intraocular lens (IOL) without conjunctival dissection. A retrospective study in Chang Gung Memorial Hospital, Keelung and Taoyuan, Taiwan. Patients receiving combined 23-gauge transconjunctival pars plana vitrectomy and scleral fixation of IOL without conjunctival dissection were enrolled. The ocular findings, causes of lens complication, surgical procedures, type of IOL used, and complications were documented. We included 40 eyes from 39 patients (27 male, 12 female) with a mean age of 59.5 [standard deviation (±) 14.8] years old. The mean follow-up duration was 6.8 ± 5.4 months. The cause of lens complications was ocular trauma in 24 (60%) eyes, cataract surgery complications in 11 (28%) eyes, and spontaneous subluxation of crystalline lens in 5 (13%) eyes. The overall best corrected visual acuity (BCVA) (logMAR) improved from 1.359 ± 0.735 to 0.514 ± 0.582 (p IOL decentration was found in 3 (8%) eyes and 1 (3%) eye respectively. Combined 23-gauge transconjunctival vitrectomy and scleral fixation of IOL without conjunctival dissection is effective and safe in managing a wide variety of lens complications, with good postoperative comfort and visual recovery. Retrospective study, not applicable.

  2. CT-guided corticosteroid injection for solitary eosinophilic granuloma of the spine

    Energy Technology Data Exchange (ETDEWEB)

    Rimondi, Eugenio; Rossi, Giuseppe [Istituto Ortopedico Rizzoli, University of Bologna, Department of Radiology and Interventional Angiographic Radiology, Bologna (Italy); Mavrogenis, Andreas F. [Istituto Ortopedico Rizzoli, University of Bologna, Department of Orthopedics, Bologna (Italy); Istituto Ortopedico Rizzoli, University of Bologna, Department of Orthopaedics, Orthopaedic Oncology Service, Bologna (Italy); Ussia, Giuseppe; Angelini, Andrea [Istituto Ortopedico Rizzoli, University of Bologna, Department of Orthopedics, Bologna (Italy); Ruggieri, Pietro [Istituto Ortopedico Rizzoli, University of Bologna, Department of Orthopedics, Bologna (Italy); Istituto Ortopedico Rizzoli, University of Bologna, Department of Orthopaedics, Bologna (Italy)

    2011-06-15

    To evaluate the clinical and imaging outcome of patients with symptomatic eosinophilic granuloma of the spine treated with CT-guided intralesional methylprednisolone injection after biopsy. Patients (n =19) with symptomatic solitary eosinophilic granuloma of the spine treated by CT-guided intralesional methylprednisolone injection were retrospectively studied. There were 12 males and seven females with a mean age of 17 years (range, 3-43 years). The mean follow-up was 6 years (median, 4 years; range, 0.5-19 years). Spinal location included the cervical (two patients), thoracic (seven patients), lumbar spine (eight patients), and the sacrum (two patients). Vertebra plana was observed in two patients. All patients had biopsies before treatment. Complete resolution of pain and healing of the lesion was observed in 17 patients (89.5%); none of these patients had recurrence at the latest examination. Reconstitution of the T1 and L1 vertebra plana was observed in both patients. Two patients initially diagnosed and treated for a solitary eosinophilic granuloma had constant pain after the procedure; in these patients, 6 and 12 months after the procedure, respectively, imaging showed multifocal disease and systemic therapy was administered. Complications related to the procedure were not observed. General anesthesia was administered in two patients because of intolerable pain during the procedure. In view of the benign clinical course of eosinophilic granuloma, in patients with symptomatic lesions, CT-guided intralesional corticosteroid injection is a safe and effective outpatient treatment with a low complication rate. (orig.)

  3. Interaction between plasticized polyvinyl chloride waterproofing membrane and extruded polystyrene board, in the inverted flat roof

    Directory of Open Access Journals (Sweden)

    Pedrosa, A.

    2014-12-01

    Full Text Available The inverted flat roof is a constructive system widely used in flat roof construction. In this constructive solution, the insulation is placed over the waterproofing material as a protection. It is believed that this solution provides a longer life cycle; given the fact that it limits the thermal variation the waterproofing material bears up to the end of its life cycle. Consequently, the result will be providing a longer life to the waterproofing membrane. This constructive solution always incorporates polymers or other materials with a thermoplastic addition in their composition. Some polymers show interactions between them that can affect their integrity, and, at the same time, the bulk of the polymeric materials are incompatible. The extruded polystyrene board is always present in the inverted flat roof, and although it is an unbeatable product for this use, it presents incompatibilities and interactions with other materials, and these can affect their properties and therefore the durability of them.La cubierta plana invertida es un sistema constructivo muy utilizado en las cubiertas planas. En esta solución constructiva, el aislamiento se coloca sobre el material impermeabilizante a modo de protección. Se cree que esta solución proporciona un ciclo de vida más largo; dado que se limita la variación térmica de la impermeabilización hasta el final de su ciclo de vida. En consecuencia, el resultado proporciona una vida más larga a la membrana impermeable. Esta solución constructiva siempre incorpora polímeros u otros materiales con adición termoplástica en su composición. Algunos polímeros muestran interacciones entre ellos que pueden afectar a su integridad, además, la mayor parte de los materiales poliméricos son incompatibles. La plancha de poliestireno extrusionado está siempre presente en la cubierta plana invertida, y aunque es un producto inmejorable para este uso, presenta incompatibilidades e interacciones con otros

  4. Parotid gland sparing radiotherapy technique using 3-D conformal radiotherapy for nasopharyngeal carcinoma

    International Nuclear Information System (INIS)

    Lim, Ji Hoon; Kim, Gwi Eon; Keum, Ki Chang; Suh, Chang Ok; Lee, Sang Wook; Park, Hee Chul; Cho, Jae Ho; Chang, Sei Kyung; Loh, Juhn Kyu

    2000-01-01

    Although using the high energy photon beam with conventional parallel-opposed beams radio-therapy for nasopgaryngeal carcinoma, radiation-induced xerostomia is a troublesome problem for patients. We conducted this study to explore a new parotid gland sparing technique in 3-D conformal radiotherapy (3-DCRT) in an effort to prevent the radiation-induced xerostomia. We performed three different planning for four clinically node-negative nasopharyngeal cancer patients with different location of tumor(intracranial extension, nasal cavity extension, oropharyngeal extension, parapharyngeal extension), and intercompared the plans. Total prescription dose was 70.2 Gy to the isocenter. For plan-A, 2-D parallel opposing fields, a conventional radiotherapy technique, were employed. For plan-B, 2-D parallel opposing fields were used up until 54 Gy and afterwards 3-D non-coplanar beams were used. For plan-C, the new technique, 54Gy was delivered by 3-D conformal 3-port beams (AP and both lateral ports with wedge compensator, shielding both superficial lobes of parotid glands at the AP beam using BEV) from the beginning of the treatment and early spinal cord block (at 36 Gy) was performed. And bilateral posterior necks were treated with electron after 36 Gy. After 54 Gy, non-coplanar beams were used for cone-down plan. We intercompared dose statistics (Dmax, Dmin, Dmean, D95, D05, V95, V05, Volume receiving 46 Gy) and dose volume histograms (DVH) of tumor and normal tissues and NTCP values of parotid glands for the above three plans. For all patients, the new technique (plan-C) was comparable or superior to the other plans in target volume isodose distribution and dose statistics and it has more homogenous target volume coverage. The new technique was most superior to the other plans in parotid glands sparing (volume receiving 46 Gy: 100, 98, 69% for each plan-A, B and C). And it showed the lowest NTCP value of parotid glands in all patients (range of NTCP; 96-100%, 79-99%, 51

  5. Outcomes Associated With Concurrent Iris-Sutured Intraocular Lens Placement and Subluxated Crystalline Lens Extraction.

    Science.gov (United States)

    McClellan, Scott F; Soiberman, Uri; Gehlbach, Peter L; Murakami, Peter N; Stark, Walter J

    2015-08-01

    We have developed a novel surgical technique, to our knowledge, for the management of subluxated crystalline lenses involving preplacement of an iris-sutured posterior chamber intraocular lens (PCIOL) before pars plana vitrectomy and lensectomy. To investigate the outcomes of eyes with subluxated crystalline lenses, predominantly a result of Marfan syndrome (14 eyes [58%]) or trauma (5 eyes [21%]), that underwent pars plana vitrectomy and lensectomy with placement of an iris-sutured PCIOL. We performed a retrospective, noncomparative case series of 24 eyes from 17 consecutive adult patients with surgically treated subluxated crystalline lenses presenting to the Wilmer Eye Institute at Johns Hopkins Hospital from October 6, 2006, through May 1, 2013. The mean (SD) postoperative follow-up was 24.4 (20.5) months for eyes with at least 6 months of follow-up (last date, October 13, 2014). We performed the analysis from January 21, 2014, through January 3, 2015. Improvement in best-corrected visual acuity using an automated Snellen chart and induction of astigmatism for eyes with at least 6 months of follow-up (n = 18) and IOL stability during follow-up for all eyes (n = 24). The mean (SD) age at surgery was 49.4 (10.7 [range, 29-67]) years. We found an improvement in mean (SD [95% CI]) best-corrected visual acuity from 0.66 (0.71 [0.30-1.02]) logMAR preoperatively (Snellen equivalent, approximately 20/90; range, 20/30 to hand motions) to 0.07 (0.11 [95% CI, 0.01-0.12]) logMAR postoperatively (Snellen equivalent, approximately 20/23; range, 20/15 to 20/50). We found little change in astigmatism postoperatively (mean change, -0.1 [95% CI, -0.5 to 0.13] diopters). Postoperative complications included retinal detachment (1 eye [4%]), retained cortical fragment (1 [4%]), cystoid macular edema (2 [8%]), and IOL subluxation (3 [13%]) owing to haptic slippage within 3 months of the procedure. The overall probability of successfully achieving placement of a centered iris

  6. La Llegenda del llibreter assassí de Barcelona. Tradizione e traduzione. Note al margine dell’edizione italiana

    Directory of Open Access Journals (Sweden)

    Inés Ravasini

    2013-12-01

    Full Text Available La recente pubblicazione in Italia della traduzione de La llegenda del llibreter assassí di Ramon Miquel i Planas offre lo spunto per un confronto con alcune precedenti traduzioni in castigliano e per una breve riflessione di metodo sulla traduzione. Le due versioni spagnole (1991 e 2011 si configurano infatti, a differenza di quella italiana, come libere rielaborazioni dell’originale dal momento che ne alterano la struttura, trasformando il testo e piegandolo a nuove finalità. L’elemento di interesse di questa «manipolazione» risiede nel fatto che essa è in qualche modo autorizzata dalla stessa natura miscellanea dell’opera di Miquel i Planas, al contempo libro erudito e antologia di materiali narrativi diversi, e dalle variegate forme di trasmissione dei materiali leggendari raccolti dallo studioso catalano. Le versioni della Llegenda consentono così d’iscrivere la riflessione sul tradurre nell’ambito della ricezione e dell’influsso esercitato dalla tradizione di un testo sulle sue modalità di traduzione. The recent publication of the Italian translation of La llegenda del llibreter assassí by Ramon Miquel i Planas provides an opportunity to make a comparison with some previous Spanish translations and to reflect briefly on translation methods. The two Spanish versions (1991 and 2011, unlike the Italian one, are free reworkings of the original, in the sense that they alter the structure, transform the text and shape it to new ends. What is interesting about this «manipulation» is that it is in some way legitimised by the heterogeneous nature of Miquel i Planas’s work, which is both an erudite volume and an anthology of different narrative materials, as well as by the varied ways in which the Catalan scholar handles materials relating to legends. The versions of Llegenda thus permit the inclusion of this reflection on translation in the sphere of the reception of a text and of the influence exerted by the tradition

  7. Multiple methods of surgical treatment combined with primary IOL implantation on traumatic lens subluxation/dislocation in patients with secondary glaucoma

    Directory of Open Access Journals (Sweden)

    Rui Wang

    2014-04-01

    Full Text Available AIM:To describe clinical findings and complications from cases of traumatic lens subluxation/dislocation in patients with secondary glaucoma, and discuss the multiple treating methods of operation combined with primary intraocular lens (IOL implantation.METHODS:Non-comparative retrospective observational case series. Participants:30 cases (30 eyes of lens subluxation/dislocation in patients with secondary glaucoma were investigated which accepted the surgical treatment by author in the Ophthalmology of Xi''an No.4 Hospital from 2007 to 2011. According to the different situations of lens subluxation/dislocation, various surgical procedures were performed such as crystalline lens phacoemulsification, crystalline lens phacoemulsification combined anterior vitrectomy, intracapsular cataract extraction combined anterior vitrectomy, lensectomy combined anterior vitrectomy though peripheral transparent cornea incision, pars plana lensectomy combined pars plana vitrectomy, and intravitreal cavity crystalline lens phacofragmentation combined pars plana vitrectomy. And whether to implement trabeculectomy depended on the different situations of secondary glaucoma. The posterior chamber intraocular lenses (PC-IOLs were implanted in the capsular-bag or trassclerally sutured in the sulus decided by whether the capsular were present. Main outcome measures:visual acuity, intraocular pressure, the situation of intraocular lens and complications after the operations.RESULTS: The follow-up time was 11-36mo (21.4±7.13. Postoperative visual acuity of all eyes were improved; 28 cases maintained IOP below 21 mm Hg; 2 cases had slightly IOL subluxation, 4 cases had slightly tilted lens optical area; 1 case had postoperative choroidal detachment; 4 cases had postoperative corneal edema more than 1wk, but eventually recovered transparent; 2 cases had mild postoperative vitreous hemorrhage, and absorbed 4wk later. There was no postoperative retinal detachment, IOL

  8. 1999, 2000, 2001 ve 2008 KRİZ DÖNEMLERİNDE TÜRK TİCARİ BANKALARININ KÂRLILIKLARININ LOJİSTİK REGRESYON ANALİZİ İLE İNCELENMESİ

    Directory of Open Access Journals (Sweden)

    Açelya TELLİ

    2016-02-01

    Full Text Available Dünya genelinde özellikle 1980 sonrası yaşanan finansal krizler, Türk Bankacılık Sistemi başta olmak üzere tüm finansal sistemi oldukça ağır zararlarla karşı karşıya bırakmış ve araştırmacılar tarafından daha ciddi şekilde incelenmesine neden olmuştur. Bu doğrultuda çalışmanın amacı; 1999, 2000, 2001 ve 2008 yıllarında yaşanan finansal krizlerin karşılaştırılarak Türk Bankacılık Sistemi’ndeki ticari bankaların karlılık performansı üzerine etkisini araştırmaktır. Bu amaçla; Türkiye Bankalar Bir- liği’nce yayınlanan karlılık oranları bağımlı değişkenler ve dört temel finansal rasyo grubu bağımsız değişkenler olarak alınmış ve her yıl için ayrı regresyon modeli oluşturulmuştur. Elde edilen bulgular sonucunda, ilgili yıllarda aktif karlılığı ve öz kaynak karlılığı bağımlı değişkenleri için gelir gider grubu rasyoları ön plana çıkmıştır. Net faiz marjı bağımlı değişkeni için ise 1999, 2000 ve 2008 yılları için herhangi bir rasyo grubu ön plana çıkmamakla birlikte, 2001 yılı için gelir gider grubu rasyoları ve sermaye yeterliliği grubu rasyoları ön plana çıkmıştır.

  9. INTERNAL LIMITING MEMBRANE PEELING VERSUS INVERTED FLAP TECHNIQUE FOR TREATMENT OF FULL-THICKNESS MACULAR HOLES: A COMPARATIVE STUDY IN A LARGE SERIES OF PATIENTS.

    Science.gov (United States)

    Rizzo, Stanislao; Tartaro, Ruggero; Barca, Francesco; Caporossi, Tomaso; Bacherini, Daniela; Giansanti, Fabrizio

    2017-12-08

    The inverted flap (IF) technique has recently been introduced in macular hole (MH) surgery. The IF technique has shown an increase of the success rate in the case of large MHs and in MHs associated with high myopia. This study reports the anatomical and functional results in a large series of patients affected by MH treated using pars plana vitrectomy and gas tamponade combined with internal limiting membrane (ILM) peeling or IF. This is a retrospective, consecutive, nonrandomized comparative study of patients affected by idiopathic or myopic MH treated using small-gauge pars plana vitrectomy (25- or 23-gauge) between January 2011 and May 2016. The patients were divided into two groups according to the ILM removal technique (complete removal vs. IF). A subgroup analysis was performed according to the MH diameter (MH peeling and 320 patients underwent pars plana vitrectomy and IF. Overall, 84.94% of the patients had complete anatomical success characterized by MH closure after the operation. In particular, among the patients who underwent only ILM peeling the closure rate was 78.75%; among the patients who underwent the IF technique, it was 91.93% (P = 0.001); and among the patients affected by full-thickness MH ≥400 µm, success was achieved in 95.6% of the cases in the IF group and in 78.6% in the ILM peeling group (P = 0.001); among the patients with an axial length ≥26 mm, success was achieved in 88.4% of the cases in the IF group and in 38.9% in the ILM peeling group (P = 0.001). Average preoperative best-corrected visual acuity was 0.77 (SD = 0.32) logarithm of the minimum angle of resolution (20/118 Snellen) in the peeling group and 0.74 (SD = 0.33) logarithm of the minimum angle of resolution (20/110 Snellen) in the IF group (P = 0.31). Mean postoperative best-corrected visual acuity was 0.52 (SD = 0.42) logarithm of the minimum angle of resolution (20/66 Snellen) in the peeling group and 0.43 (SD = 0.31) logarithm of the minimum angle of resolution (20

  10. Additions to the flora of Tenerife (Canary Islands, Spain

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    Verloove, F.

    2011-12-01

    Full Text Available Additions to the flora of Tenerife (Canary Islands, Spain.- Recent fieldwork in Tenerife, especially in September 2010, yielded several interesting new records of non-native vascular plants. Bothriochloa ischaemum var. songarica, “Asian” Cardamine flexuosa, Cestrum parqui, Digitaria violascens, Ficus lyrata, Ficus rubiginosa, Hoffmannseggia glauca, Hyparrhenia rufa subsp. altissima, Jacaranda mimosifolia, Merremia tuberosa, Passiflora morifolia, Phytolacca dioica, Schefflera actinophylla and Solanum abutiloides are reported for the first time from the Canary Islands, while Eragrostis barrelieri var. pygmaea, Ficus microcarpa, Ipomoea purpurea, Leucaena leucocephala subsp. glabrata, Sechium edule, Tradescantia zebrina and Turnera ulmifolia are new to the flora of the island of Tenerife. New records of Acacia cyclops, Atriplex suberecta, Heliotropium curassavicum, Paspalum dilatatum, P. notatum, Pluchea ovalis, Pulicaria paludosa, Sclerophylax spinescens and Solanum villosum subsp. miniatum confirm their recent expansion on the island of Tenerife. New records are provided for the recently described Sporobolus copei . Finally, Paspalum vaginatum (hitherto possibly confused with P. distichum and Potentilla indica are confirmed from the island of Tenerife.

    Adiciones para la flora de Tenerife (Islas Canarias, España.- Algunos recientes trabajos de campo en Tenerife, especialmente en Septiembre de 2010, trajeron consigo varias nuevas e interesantes adiciones de plantas vasculares no autóctonas. Bothriochloa ischaemum var. songarica, Cardamine flexuosa “Asiática”, Cestrum parqui, Digitaria violascens, Ficus lyrata, Ficus rubiginosa, Hoffmannseggia glauca, Hyparrhenia rufa subsp. altissima, Jacaranda mimosifolia, Merremia tuberosa, Passiflora morifolia, Phytolacca dioica, Schefflera actinophylla y

  11. Banco de sementes como indicador de restauração de uma área degradada por mineração de caulim em Brás Pires, MG Seed bank as indicator of restoration of a kaolin mining - degraded area in Brás Pires, MG

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    Sebastião Venâncio Martins

    2008-12-01

    Full Text Available Este estudo teve como objetivo caracterizar o banco de sementes sob vegetação secundária em uma área degradada por mineração de caulim em Brás Pires, MG. Foram coletadas 40 amostras de solo de 0,5 x 0,5 m até a profundidade de 5,0 cm. As amostras foram mantidas em viveiro por quatro meses, sendo metade em sombreamento de 11,5% (luz e metade em sombreamento de 60% (sombra. A germinação das sementes foi comparada nas duas condições de sombra (11,5% e 60%, utilizando-se o teste t para amostras independentes. Foram amostradas 36 espécies pertencentes a 17 famílias botânicas. As famílias com maior riqueza específica foram Asteraceae, com nove espécies, Rubiaceae com cinco e Poaceae com quatro. A maioria das espécies (66,7% e dos indivíduos (82,2% amostrados no banco foi de herbácea. As espécies com maior número de indivíduos germinados do banco foram as herbáceas Urochloa decumbens (Stapf R.D. Webster, Cenchrus sp. e Eragrostis sp. e a arbustiva Leandra niangaeformis Cogn. Entre as arbóreas, destacaram-se em número de indivíduos Luehea grandiflora Mart. e Trema micranta (L. Blume. A maior densidade de ervas daninhas oriundas de áreas antropizadas do entorno indicou baixa resiliência da vegetação presente na área degradada em caso de ocorrer alguma perturbação severa.This study aimed to characterize the soil seed bank under secondary vegetation in an area degraded by kaolin mining in Brás Pires, MG, Brazil. Forty soil samples of 0.5 x 0.5 m were collected to the depth of 5.0 cm. The soil samples were maintained in nursery for four months, half in shading of 11.5% (light, and half in shading of 60% (shade. Seed germination was compared under the two shade conditions (11.5% and 60%, utilizing the t test for independent samples. Thirty-six species belonging to 17 botanical families were sampled. The families with the largest number of species were Asteraceae with 9, Rubiaceae with 5, and Poaceae with 4. Most of the

  12. Polliniferous plants aud foraging strategles Of Apis mellifera (Hyínenoptera: Apidae in the Yucatán Peninsula, Mexico

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    Rogel Villanueva-G

    2002-12-01

    Full Text Available A study of the most important polliniferous plants for European and Africanized honeybees (Apis mellifera L. was made in Quintana Roo state. Comparisons were made between the plants visited by both bee types in order to determine whether there were qualitative or quantitative differences in their choice of plant species. Also some foraging strategies of the honeybees were analysed. Pollen from pollen load samples was acetolysed and mounted on slides. Subsequently the polien grains were identified, counted and photographed. A total of 206 pollen load samples were collected at Palmas and St. Teresa during two years. The most frequent species in the ponen load samples from European and Africanized honeyhees were Cecropia peltata, Metopium brownei, Lonchocarpus sp. 2, Viguiera dentata, Eragrostis sp. 1, Bursera simaruba and Eupatorium albicaule. Both types of honey bees show a high reliance on pollen from only a few species, the first five named above comprised around 50% of all the mean percentage frequencies. Families that contributed with the largest number of polien species were Fabaceae, Asteraceac, Boraginaceae, Convolvulaecae, Euphorbiaceae, Sapindaceae, Poaceac, Myrtaceae, Sapotaceae and Tiliaceae. C. peltata, Trema micrantha, B. simaruba, Eugenia sp. 1, Thouinia canesceras, Pouteria sp. 1, Mimosa bahamensis and V. dentata, were the pollen species with the largest percentages of oceurrence in both European and Africanized bee pollen load samples, and also represent a "long-term" food resources during the year.Un estudio de las plantas poliníferas más importantes para las abejas europeas y africanizadas (Apis melifera L. se realizó en el estado de Quintana Roo. Se hicieron comparaciones entre plantas visitadas por ambos tipos de abejas, con el objetivo de determinar si hay diferencias cualitativas o cuantitativas en la elección de la especie de planta. Adicionalmente, se analizaron algunas estrategias de forrajeo de las abejas. Muestras

  13. Leaf gas exchange and water status responses of a native and non-native grass to precipitation across contrasting soil surfaces in the Sonoran Desert.

    Science.gov (United States)

    Ignace, Danielle D; Huxman, Travis E; Weltzin, Jake F; Williams, David G

    2007-06-01

    Arid and semi-arid ecosystems of the southwestern US are undergoing changes in vegetation composition and are predicted to experience shifts in climate. To understand implications of these current and predicted changes, we conducted a precipitation manipulation experiment on the Santa Rita Experimental Range in southeastern Arizona. The objectives of our study were to determine how soil surface and seasonal timing of rainfall events mediate the dynamics of leaf-level photosynthesis and plant water status of a native and non-native grass species in response to precipitation pulse events. We followed a simulated precipitation event (pulse) that occurred prior to the onset of the North American monsoon (in June) and at the peak of the monsoon (in August) for 2002 and 2003. We measured responses of pre-dawn water potential, photosynthetic rate, and stomatal conductance of native (Heteropogon contortus) and non-native (Eragrostis lehmanniana) C(4) bunchgrasses on sandy and clay-rich soil surfaces. Soil surface did not always amplify differences in plant response to a pulse event. A June pulse event lead to an increase in plant water status and photosynthesis. Whereas the August pulse did not lead to an increase in plant water status and photosynthesis, due to favorable soil moisture conditions facilitating high plant performance during this period. E. lehmanniana did not demonstrate heightened photosynthetic performance over the native species in response to pulses across both soil surfaces. Overall accumulated leaf-level CO(2) response to a pulse event was dependent on antecedent soil moisture during the August pulse event, but not during the June pulse event. This work highlights the need to understand how desert species respond to pulse events across contrasting soil surfaces in water-limited systems that are predicted to experience changes in climate.

  14. Gibberellin Deficiency Confers Both Lodging and Drought Tolerance in Small Cereals

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    Sonia ePlaza-Wüthrich

    2016-05-01

    Full Text Available Tef [Eragrostis tef (Zucc. Trotter] and finger millet [Eleusine coracana Gaertn] are staple cereal crops in Africa and Asia with several desirable agronomic and nutritional properties. Tef is becoming a life-style crop as it is gluten-free while finger millet has a low glycemic index which makes it an ideal food for diabetic patients. However, both tef and finger millet have extremely low grain yields mainly due to moisture scarcity and susceptibility of the plants to lodging. In this study, the effects of gibberellic acid (GA inhibitors particularly paclobutrazol (PBZ on diverse physiological and yield-related parameters were investigated and compared to GA mutants in rice (Oryza sativa L.. The application of PBZ to tef and finger millet significantly reduced the plant height and increased lodging tolerance. Remarkably, PBZ also enhanced the tolerance of both tef and finger millet to moisture deficit. Under moisture scarcity, tef plants treated with PBZ did not exhibit drought-related symptoms and their stomatal conductance was unaltered, leading to higher shoot biomass and grain yield. Semi-dwarf rice mutants altered in GA biosynthesis, were also shown to have improved tolerance to dehydration. The combination of traits (drought tolerance, lodging tolerance and increased yield that we found in plants with altered GA pathway is of importance to breeders who would otherwise rely on extensive crossing to introgress each trait individually. The key role played by PBZ in the tolerance to both lodging and drought calls for further studies using mutants in the GA biosynthesis pathway in order to obtain candidate lines which can be incorporated into crop-breeding programs to create lodging tolerant and climate-smart crops.

  15. Global ex-situ crop diversity conservation and the Svalbard Global Seed Vault: assessing the current status.

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    Ola T Westengen

    Full Text Available Ex-situ conservation of crop diversity is a global concern, and the development of an efficient and sustainable conservation system is a historic priority recognized in international law and policy. We assess the completeness of the safety duplication collection in the Svalbard Global Seed Vault with respect to data on the world's ex-situ collections as reported by the Food and Agriculture Organization of the United Nations. Currently, 774,601 samples are deposited at Svalbard by 53 genebanks. We estimate that more than one third of the globally distinct accessions of 156 crop genera stored in genebanks as orthodox seeds are conserved in the Seed Vault. The numbers of safety duplicates of Triticum (wheat, Sorghum (sorghum, Pennisetum (pearl millet, Eleusine (finger millet, Cicer (chickpea and Lens (lentil exceed 50% of the estimated numbers of distinct accessions in global ex-situ collections. The number of accessions conserved globally generally reflects importance for food production, but there are significant gaps in the safety collection at Svalbard in some genera of high importance for food security in tropical countries, such as Amaranthus (amaranth, Chenopodium (quinoa, Eragrostis (teff and Abelmoschus (okra. In the 29 food-crop genera with the largest number of accessions stored globally, an average of 5.5 out of the ten largest collections is already represented in the Seed Vault collection or is covered by existing deposit agreements. The high coverage of ITPGRFA Annex 1 crops and of those crops for which there is a CGIAR mandate in the current Seed Vault collection indicates that existence of international policies and institutions are important determinants for accessions to be safety duplicated at Svalbard. As a back-up site for the global conservation system, the Seed Vault plays not only a practical but also a symbolic role for enhanced integration and cooperation for conservation of crop diversity.

  16. Classification and mapping of the composition and structure of dry woodland and savanna in the eastern Okavango Delta

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    Michelle J. Tedder

    2013-02-01

    Full Text Available The dry woodland and savanna regions of the Okavango Delta form a transition zone between the Okavango Swamps and the Kalahari Desert and have been largely overlooked in terms of vegetation classification and mapping. This study focused on the species composition and height structure of this vegetation, with the aim of identifying vegetation classes and providing a vegetation map accompanied by quantitative data. Two hundred and fifty-six plots (50 m × 50 m were sampled and species cover abundance, total cover and structural composition were recorded. The plots were classified using agglomerative, hierarchical cluster analysis using group means and Bray-Curtis similarity and groups described using indicator species analysis. In total, 23 woody species and 28 grass species were recorded. Acacia erioloba and Colophospermum mopane were the most common woody species, whilst Urochloa mossambicensis, Panicum maximum, Dactyloctenium gigantiumand Eragrostis lehmanniana were the most widespread grasses. Eleven vegetation types were identified, with the most widespread being Short mixed mopane woodland, Tall mopane woodland and Tall mixed mopane woodland, covering 288.73 km2 (28%, 209.14 km2 (20% and 173.30 km2 (17% of the area, respectively. Despite their extensive area, these three vegetation types were the least species-rich, whilst Palm thornveld, Short mixed broadleaf woodland and Open mixed Acacia woodland were the most taxonomically variable. By contrast, Closed mixed Acacia woodland and Closed Acacia–Combretum woodland had the most limited distribution, accounting for less than 1% of the mapped area each.Conservation implications: The dry woodland and savanna vegetation of the Okavango Delta comprises a much wider suite of plant communities than the Acacia-dominated and Mopane-dominated classifications often used. This classification provided a more detailed understanding of this vegetation and essential background information for monitoring

  17. Evaluation of six candidate DNA barcode loci for identification of five important invasive grasses in eastern Australia.

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    Aisuo Wang

    Full Text Available Invasive grass weeds reduce farm productivity, threaten biodiversity, and increase weed control costs. Identification of invasive grasses from native grasses has generally relied on the morphological examination of grass floral material. DNA barcoding may provide an alternative means to identify co-occurring native and invasive grasses, particularly during early growth stages when floral characters are unavailable for analysis. However, there are no universal loci available for grass barcoding. We herein evaluated the utility of six candidate loci (atpF intron, matK, ndhK-ndhC, psbE-petL, ETS and ITS for barcode identification of several economically important invasive grass species frequently found among native grasses in eastern Australia. We evaluated these loci in 66 specimens representing five invasive grass species (Chloris gayana, Eragrostis curvula, Hyparrhenia hirta, Nassella neesiana, Nassella trichotoma and seven native grass species. Our results indicated that, while no single locus can be universally used as a DNA barcode for distinguishing the grass species examined in this study, two plastid loci (atpF and matK showed good distinguishing power to separate most of the taxa examined, and could be used as a dual locus to distinguish several of the invasive from the native species. Low PCR success rates were evidenced among two nuclear loci (ETS and ITS, and few species were amplified at these loci, however ETS was able to genetically distinguish the two important invasive Nassella species. Multiple loci analyses also suggested that ETS played a crucial role in allowing identification of the two Nassella species in the multiple loci combinations.

  18. Diversifying crops for food and nutrition security - a case of teff.

    Science.gov (United States)

    Cheng, Acga; Mayes, Sean; Dalle, Gemedo; Demissew, Sebsebe; Massawe, Festo

    2017-02-01

    There are more than 50000 known edible plants in the world, yet two-thirds of global plant-derived food is provided by only three major cereals - maize (Zea mays), wheat (Triticum aestivum) and rice (Oryza sativa). The dominance of this triad, now considered truly global food commodities, has led to a decline in the number of crop species contributing to global food supplies. Our dependence on only a few crop species limits our capability to deal with challenges posed by the adverse effects of climate change and the consequences of dietary imbalance. Emerging evidence suggests that climate change will cause shifts in crop production and yield loss due to more unpredictable and hostile weather patterns. One solution to this problem is through the wider use of underutilised (also called orphan or minor) crops to diversify agricultural systems and food sources. In addition to being highly nutritious, underutilised crops are resilient in natural and agricultural conditions, making them a suitable surrogate to the major crops. One such crop is teff [Eragrostis tef (Zucc.) Trotter], a warm-season annual cereal with the tiniest grain in the world. Native to Ethiopia and often the sustenance for local small farmers, teff thrives in both moisture-stressed and waterlogged soil conditions, making it a dependable staple within and beyond its current centre of origin. Today, teff is deemed a healthy wheat alternative in the West and is sought-after by health aficionados and those with coeliac disease or gluten sensitivity. The blooming market for healthy food is breathing new life into this underutilised crop, which has received relatively limited attention from mainstream research perhaps due to its 'orphan crop' status. This review presents the past, present and future of an ancient grain with a potential beyond its size. © 2015 Cambridge Philosophical Society.

  19. Dynamique de la flore et de la végétation des Niayes et du Bassin arachidier au Sénégal

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    Elhadji Faye

    2014-12-01

    Full Text Available Reactualisation of floristic and phytosociologic datas in Niayes and Peanut-Basin areas were undertook with village scale approach to better underline resources' conervation. In Savannah and sub-guinean areas specially in the Peanut-Basin and Niayes, 288 floristic samples were put in place in 6 villages in an stratified way based on ethnic groups, land use systems and topography. In the same time, 25 samples were realised in the 2 reference sites (Noflaye and Sambandé and comparison were made with researches conducted in 1940. Datas were submitted to multivariate analysis. SØrensen similarity index were used to compare villages systems and natural sites. Results showed discrimination of 11 phytosociologic groups: 5 of which came from natural sites (savanah G4 Hexalobus monopetalus et Gardenia ternifolia and G8 Acacia macrostachya et Ischaemum rugosum, secondary forest G10 Aphania senegalensis et Voaganca africana, semi-aquatic vegetations G1 Ipomoea aquatica et I. dichroa and G5 Phragmites australis subsp australis et Paspalum vaginatum and 6 from anthropic systems (disturbed areas G6 Echinochloa colona et Jussiae erecta and G7 Dactyloctenium aegyptium et Brachiaria disticophylla, and finally post-cultural zones with G2 Brachiaria disticophylla et Cenchrus biflorus, G3 Celosia trigyna et Digitaria velutina, G9 Tephrosia purpurea et Cenchrus biflorus and G11 Mitracarpus scaber et Eragrostis tremula. Natural sites groups were progressively invided by disturded area species and the others by ruderals and nitrophyl species. Overall floristic richness is about 336 species among which 260 from the Niayes sites and 176 from Peanut-Basin ones. References sites are always richer in terms af genera but peul areas are richer in termes of species. Differences were evidenced between actual taxa and Trochain (1940 descriptions. This methodological approach might be extended to other ecogeographical zones in Senegal in order to better identify and follow

  20. Symbiosis in the Context of an Invasive, Non-Native Grass: Fungal Biodiversity and Student Engagement

    Science.gov (United States)

    Lehr, Gavin

    Grasslands in the western United States face severe environmental threats including those brought about by climate change, such as changes in precipitation regimes and altered fire cycles; land-use conversion and development; and the introduction, establishment, and spread of non-native species. Lehmann's lovegrass (Eragrostis lehmanniana) was introduced to the southwestern United States in the early 1900s. Since its introduction, it has become the dominant grass in the mid-elevation grasslands of southern Arizona, including the Santa Rita Experimental Range (SRER), where it has displaced native grasses including Arizona cottontop, three awns, and gramas. Like all plants in terrestrial ecosystems, this grass harbors fungal symbionts that can be important for its establishment and persistence. This thesis focuses on fungal symbionts of Lehmann's lovegrass and has two components. First, the diversity and distributions of endophytes in Lehmann's lovegrass are evaluated in the context of biotic and abiotic factors in the SRER. Culturing from roots and shoots of Lehmann's lovegrass at points beneath and outside the canopy of native mesquites, which are encroaching on grasslands over time, provides insight into how a single plant species can exhibit local variation in the composition of its symbionts. Second, the thesis is used as the basis for engagement of students in science, technology, engineering, and mathematics (STEM) through the development and implementation of classroom- and field activities centered on endophytes, which help high school students address core learning aims while also gaining real research experience. Engaging students in important questions relevant to their local environment can catalyze interest in science and help students cross the threshold into research. The contributions of such approaches with respect to learning not only fulfills key next-generation science standards and common core objectives, but provides students with a meaningful

  1. Floristic and phytosociology of weeds in pastures in Maranhão State, Northeast Brazil

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    Jaílson Penha Costa

    2016-06-01

    Full Text Available ABSTRACT Knowledge of weed floristic composition and phytosociology are key factors for improving weed management in pastures. Information on weed species that occur in pastures in Northeast Brazil, particularly in Maranhão State is very limited. It is, therefore, important, to search for information to help farmers to control weeds in livestock farming. This paper describes the weed flora diversity and community structure parameters, including density, frequency, abundance and importance value for each weed species found in five pastures of same age and management in Maranhão State, Northeast Brazil. The weed survey was carried out using a wooden frame (80 cm x 30 cm placed randomly on the soil surface 30 times in each pasture (n = 150. Weeds were pulled out, separated by species and counted. The weed flora was represented by 996 individuals, from nine families, 15 genera and 19 species. Weed density within pastures was of 44.3 plants m-2. The weed flora was dominated by species of the Cyperaceae and Poaceae families. The most important weed species based on Importance Value were Eragrostis ciliaris (IV = 32.97, Cyperus rotundus (IV = 31,95, Cyperus luzulae (IV = 27,50, Cyperus sphacelatus (IV = 27,42, Pycreus lanceolatus (IV = 27,33 Cyperus haspan (IV = 25,72 and Eleusine indica (IV = 23,49. Weed diversity, based on Shannon Diversity Index was very high (H' = 4.37 nats ind-1. Our results could lead to improved weed management in pastures in Maranhão State, Northeast Brazil.

  2. Production of biodegradable plastic by polyhydroxybutyrate (PHB) accumulating bacteria using low cost agricultural waste material.

    Science.gov (United States)

    Getachew, Anteneh; Woldesenbet, Fantahun

    2016-12-12

    Polyhydroxybutyrates (PHBs) are macromolecules synthesized by bacteria. They are inclusion bodies accumulated as reserve materials when the bacteria grow under different stress conditions. Because of their fast degradability under natural environmental conditions, PHBs are selected as alternatives for production of biodegradable plastics. The aim of this work was to isolate potential PHB producing bacteria, evaluate PHB production using agro-residues as carbon sources. Among fifty bacterial strains isolated from different localities, ten PHB accumulating strains were selected and compared for their ability to accumulate PHB granules inside their cells. Isolate Arba Minch Waste Water (AWW) identified as Bacillus spp was found to be the best producer. The optimum pH, temperature, and incubation period for best PHB production by the isolate were 7, 37 °C, and 48 h respectively at 150 rpm. PHB production was best with glucose as carbon source and peptone as nitrogen source. The strain was able to accumulate 55.6, 51.6, 37.4 and 25% PHB when pretreated sugar cane bagasse, corn cob, teff straw (Eragrostis tef) and banana peel were used as carbon sources respectively. Fourier transform-infrared authentication results of the extracted and purified PHB identified its functional units as C-H, CH 2 , C=O and C-O groups. UV-Vis spectrophotometric analysis and biodegradability test confirmed the similarity of the extract with standard PHB and its suitability for bioplastic production. The isolated Bacillus sp can be used for feasible production of PHB using agro-residues especially sugarcane bagasse which can reduce the production cost in addition to reducing the disposal problem of these substrates. The yield of PHB can further be boosted by optimization of production parameters as substrates.

  3. Screening of salt-tolerance potential of some native forage grasses from the eastern part of Terai-Duar grasslands in India

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    Swarnendu Roy

    2017-09-01

    Full Text Available The salt tolerance of 12 native forage grasses from the eastern part of Terai-Duar grasslands was assessed using a rapid method of leaf disc senescence bioassay. Samples of these grasses were grown in untreated water as well as 100 and 200 mM NaCl solutions for periods of 3, 6 and 9 days. Discs of fresh leaf were then placed in untreated water as well as in 100 and 200 mM NaCl solutions for 96 hours. Quantitative effects were measured as the effects on chlorophyll concentration in leaves in response to exposure to the varying solutions. From these results, the salt sensitivity index (SSI of the individual grasses was determined. The SSI values indicated that Imperata cylindrica, Digitaria ciliaris and Cynodon dactylon were most salt-tolerant of all grasses tested. Further characterization of the grasses was done by observing the changes in 6 biomarkers for salinity tolerance: relative water content, total sugar concentration, proline concentration, electrolyte leakage, membrane lipid peroxidation and H2O2 concentration following exposure to 100 and 200 mM NaCl concentrations for 3, 6 and 9 days. Finally, hierarchical cluster analysis using the software CLUSTER 3.0 was used to represent the inter-relations among the physiological parameters and to group the grasses on the basis of their salinity tolerance. The overall results indicated that Imperata cylindrica, Eragrostis amabilis, Cynodon dactylon and Digitaria ciliaris were potentially salt-tolerant grasses and should be planted on saline areas to verify our results. On the other hand, Axonopus compressus, Chrysopogon aciculatus, Oplismenus burmanni and Thysanolaena latifolia were found to be highly salt-sensitive and would be unsuitable for use in saline areas. 

  4. Global ex-situ crop diversity conservation and the Svalbard Global Seed Vault: assessing the current status.

    Science.gov (United States)

    Westengen, Ola T; Jeppson, Simon; Guarino, Luigi

    2013-01-01

    Ex-situ conservation of crop diversity is a global concern, and the development of an efficient and sustainable conservation system is a historic priority recognized in international law and policy. We assess the completeness of the safety duplication collection in the Svalbard Global Seed Vault with respect to data on the world's ex-situ collections as reported by the Food and Agriculture Organization of the United Nations. Currently, 774,601 samples are deposited at Svalbard by 53 genebanks. We estimate that more than one third of the globally distinct accessions of 156 crop genera stored in genebanks as orthodox seeds are conserved in the Seed Vault. The numbers of safety duplicates of Triticum (wheat), Sorghum (sorghum), Pennisetum (pearl millet), Eleusine (finger millet), Cicer (chickpea) and Lens (lentil) exceed 50% of the estimated numbers of distinct accessions in global ex-situ collections. The number of accessions conserved globally generally reflects importance for food production, but there are significant gaps in the safety collection at Svalbard in some genera of high importance for food security in tropical countries, such as Amaranthus (amaranth), Chenopodium (quinoa), Eragrostis (teff) and Abelmoschus (okra). In the 29 food-crop genera with the largest number of accessions stored globally, an average of 5.5 out of the ten largest collections is already represented in the Seed Vault collection or is covered by existing deposit agreements. The high coverage of ITPGRFA Annex 1 crops and of those crops for which there is a CGIAR mandate in the current Seed Vault collection indicates that existence of international policies and institutions are important determinants for accessions to be safety duplicated at Svalbard. As a back-up site for the global conservation system, the Seed Vault plays not only a practical but also a symbolic role for enhanced integration and cooperation for conservation of crop diversity.

  5. Kinetics of caesium and potassium absorption by roots of three grass pastures and competitive effects of potassium on caesium uptake in Cynodon sp.

    Science.gov (United States)

    Ayub, J. Juri; Valverde, L. Rubio; Garcia-Sanchez, M. J.; Fernandez, J. A.; Velasco, R. H.

    2008-08-01

    Caesium uptake by plant roots has been normally associated with the uptake of potassium as the potassium transport systems present in plants have also the capacity to transport caesium. Three grass species (Eragrostis curvula, Cynodon sp and Distichlis spicata) growing in seminatural grassland of central Argentina were selected to study their capability to incorporate Cs+ (and K+) using electrophysiological techniques. Although the 137Cs soil inventory ranged between 328-730 Bq m-2 in this region, no 137Cs activity was detected in these plants. However, all the species, submitted previously to K+ starvation, showed the uptake of both Cs+ and K+ when micromolar concentrations of these cations were present in the medium. The uptake showed saturation kinetics for both cations that could be fitted to the Michelis-Menten model. KM values were smaller for K+ than for Cs+, indicating a higher affinity for the first cation. The presence of increasing K+ concentrations in the assay medium inhibited Cs+ uptake in Cynodon sp., as expected if both cations are transported by the same transport systems. This effect is due to the competition of both ions for the union sites of the high affinity potassium transporters. In field situation, where soil concentration of Cs+ is smaller than K+ concentration, is then expectable that caesium activity in plants is not detectable. Nevertheless, the studied plants would have the capacity to incorporate caesium if its availability in soil solution increases. In addition, studies of Cs/K interaction can help us to understand the variability in transfer factors.

  6. Kinetics of caesium and potassium absorption by roots of three grass pastures and competitive effects of potassium on caesium uptake in Cynodon sp

    International Nuclear Information System (INIS)

    Ayub, J. Juri; Velasco, R. H.; Valverde, L. Rubio; Garcia-Sanchez, M. J.; Fernandez, J. A.

    2008-01-01

    Caesium uptake by plant roots has been normally associated with the uptake of potassium as the potassium transport systems present in plants have also the capacity to transport caesium. Three grass species (Eragrostis curvula, Cynodon sp and Distichlis spicata) growing in seminatural grassland of central Argentina were selected to study their capability to incorporate Cs + (and K + ) using electrophysiological techniques. Although the 137 Cs soil inventory ranged between 328-730 Bq m -2 in this region, no 137 Cs activity was detected in these plants. However, all the species, submitted previously to K + starvation, showed the uptake of both Cs + and K + when micromolar concentrations of these cations were present in the medium. The uptake showed saturation kinetics for both cations that could be fitted to the Michelis-Menten model. K M values were smaller for K + than for Cs + , indicating a higher affinity for the first cation. The presence of increasing K + concentrations in the assay medium inhibited Cs + uptake in Cynodon sp., as expected if both cations are transported by the same transport systems. This effect is due to the competition of both ions for the union sites of the high affinity potassium transporters. In field situation, where soil concentration of Cs + is smaller than K + concentration, is then expectable that caesium activity in plants is not detectable. Nevertheless, the studied plants would have the capacity to incorporate caesium if its availability in soil solution increases. In addition, studies of Cs/K interaction can help us to understand the variability in transfer factors

  7. Temperaturas cardinales de desarrollo en la etapa siembra- emergencia de 11 pastos forrajeros

    Directory of Open Access Journals (Sweden)

    Noé Durán Puga

    2011-01-01

    Full Text Available Los objetivos del presente estudio fueron determinar las temperaturas cardinales de desarrollo (temperatura umbral mínima Tb, temperatura óptima To y temperatura umbral máxima Tu, e identificar un método que estime con precisión los requerimientos térmicos para la etapa siembra-emergencia (E de 11 pastos forrajeros. Ciento veinte (120 semillas de cada uno se sembraron en recipientes en condiciones controladas con un diseño experimental completamente al azar y tres repeticiones a temperaturas constantes de 15 hasta 46 ºC, en cámaras de ambiente controlado del Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias (INIFAP en Guadalajara, Jalisco, México. Las temperaturas cardinales y requerimiento térmico se estimaron mediante el método bilineal (MB y el método curvilíneo (MC, se evaluó su ajuste mediante comparación directa con los valores de desarrollo observados en ambiente controlado y coeficiente de variación de la duración de E expresada en términos de unidades calor acumuladas (UCA. Los resultados mostraron que el MB fue mejor para estimar Tb y To, y el MC fue mejor para estimar Tu. Los valores de Tb, To, Tu y UCA, fueron, Lolium perenne 9, 31, 41, 80, Festuca arundinacea 10, 31, 41, 78, Hyparrhenia rufa 12, 32, 42, 62, Eragrostis curvula 13, 32, 47, 40, Chloris gayana 13, 31, 47, 40, Melinis minutiflora 13, 31, 43, 50, Pennisetum clandestinum 12, 32, 43, 65, Brachiaria mutica 14, 32, 43, 57, Andropogon gayanus 12, 37, 48, 66, Cynodon dactylon 14, 29, 44, 48, Pennicetum ciliare 13, 30, 42, 61.

  8. Seed distribution of four co-occurring grasses around Artemisia halodendron shrubs in a sandy habitat

    Science.gov (United States)

    Li, Feng-Rui; Zhao, Wen-Zhi; Kang, Ling-Fen; Liu, Ji-Liang; Huang, Zhi-Gang; Wang, Qi

    2009-05-01

    In a natural population of the perennial semi-shrub Artemisia halodendron in a shifting sandy habitat in the Horqin Desert of eastern Inner Mongolia, six isolated adult A. halodendron individuals of similar canopy size were chosen as target plants. The density of seeds in the top 5 cm soil depth around shrubs was measured using transects aligned to the four main wind directions and at different distances from the shrub base on both the windward and leeward sides. The effects of shrub presence on seed distribution of four co-occurring grasses were examined by linking seed distribution to seed traits. Of the four species, Setaris viridis and Eragrostis pilosa had small but similar seed mass, while Chloris virgata and Aristida adscensionis had large but similar seed mass. The species were grouped into two cohorts: small-seeded vs. large-seeded cohorts, and shrub presence effects on seed distribution of both cohorts were examined. We found marked difference in the seed distribution pattern among species, especially between the small-seeded and large-seeded cohorts. The small-seeded cohort had significantly higher seed accumulation on the windward than the leeward sides in the most and least prevailing wind directions and much higher seed accumulation on the leeward than the windward sides in the second and third most prevailing wind directions, while opposite patterns occurred in the large-seeded cohort. Four species also showed marked variation in the seed distribution pattern among transects and between windward and leeward sides of each transect. This study provided further evidence that shrubs embedded in a matrix of herbaceous plants is a key cause of spatial heterogeneity in seed availability of herbaceous species. However, seed distribution responses to the presence of shrubs will vary with species as well as with wind direction, sampling position (windward vs. leeward sides of the shrub) and distance from the shrub.

  9. Preliminary evaluation of selected minerals in liver samples from springbok (Antidorcas marsupialis from the National Zoological Gardens of South Africa

    Directory of Open Access Journals (Sweden)

    Khanyisile R. Mbatha

    2012-04-01

    Full Text Available Limited information is available on the mineral nutrition of captive antelope in South Africa. Zoo animals are usually offered a very limited array of feeds, which may result in nutritional imbalances. As a pilot study to investigate the presence of myopathy in antelope at the National Zoological Gardens of South Africa (NZG, stored liver samples from six springbok (Antidorcas marsupialis and seven other antelopes from the NZG, as well as selected food items, were submitted for analysis of selenium, copper, manganese and zinc content by spectrophotometry. Springbok liver levels of copper were 23.07 mg/kg ± 0.72 mg/kg, whilst manganese, selenium and zinc levels were 6.73 mg/kg ± 0.22 mg/kg, 0.14 mg/kg ± 0.05 mg/kg and 135.02 mg/kg ± 1.26 mg/kg, respectively. Liver mineral levels in the other species were very variable. Food item copper levels ranged from 4.00 mg/kg (Eragrostis tef to 17.38 mg/kg (antelope cubes, lucerne (Medicago sativa and E. tef contained no detectable selenium. The highest zinc levels were in antelope cubes (147.00 mg/kg and the lowest were in lucerne (20.80 mg/kg. Interpretation of these results was hampered by the small number of samples and a paucity of information on liver mineral levels in free-ranging and captive antelope; however, results suggested that, in the springbok, whilst copper and manganese intake are likely adequate, selenium nutrition is probably insufficient and may account for the myopathy diagnosed. Zinc liver levels are possibly within the toxic range, perhaps as a result of the high levels of zinc in the antelope cubes. This pilot study highlighted the need to establish baseline mineral nutrition data for captive and freeranging antelope under South African conditions.

  10. Renewal of a Small Town in Poland Based on Example of Ustka

    Science.gov (United States)

    Poczobut, Joanna

    2017-10-01

    Ustka is a historical seaside town, port and health resort, a town of many possibilities. In this tourist town the old urban arrangement and many historic objects are preserved. Despite such potential, the town struggles with various problems, as do many small towns in the north of Poland. In 2003 works on a revitalization programme began (it has been implemented since 2005). The next stage was a programme which started in 2011. At present Ustka prepares for the next revitalization plan-a “District Revitalization Programme for 2016 - 2022”. The article describes: the situation at different stages of town development related to previously carried out revitalization programmes and the prospects for its further prosperity.

  11. L 'anorexie, le féminin et l'amour

    Directory of Open Access Journals (Sweden)

    Emmanuelle Borgnis Desbordes

    2012-01-01

    Full Text Available La anorexia contemporánea no es una negación de la feminidad, sino un intento de limitar el goce de la mujer que no tiene ni borde ni semblante. Tiempo contemporáneo, donde el goce tiende a estar en el control, el cuerpo y sus goces están en primera plana y señalan la desorientación del deseo. ¿Cómo reintroducir a las chicas anoréxicas al lenguaje del deseo, separándolas de los imperativos del goce, que las ponen en un camino del goce Otro, femenino, goce sentido por ellas, y al que no dominan? El control del cuerpo y de sus sensaciones es un intento de contrarrestar el goce ilimitado que las supera y al mismo tiempo las determina como mujeres.

  12. Seguimiento de trayectorias en manipuladores robóticos usando Differential Flatness

    Directory of Open Access Journals (Sweden)

    Elkin Veslin Diaz

    2011-05-01

    Full Text Available Este documento propone una aplicación con Differential Flatness para el problema de seguimiento de trayectorias en manipuladores robóticos. Para cada coordenada generalizada, se proponen sus trayectorias como una función en el tiempo donde deben encontrar las entradas correspondientes para garantizar el seguimiento. Se demuestra que la posición de cada coordenada generalizada del manipulador robótico y sus correspondientes derivadas son salidas planas que, en conjunto con un controlador PD pueden determinar, con algunas restricciones, los valores de fuerza para conseguir un movimiento en el manipulador con una mínima desviación a lo largo del trayecto, tanto en movimientos planos como en el espacio.

  13. EFRT M-12 Issue Resolution: Comparison of Filter Performance at PEP and CUF Scale

    International Nuclear Information System (INIS)

    Daniel, Richard C.; Billing, Justin M.; Bontha, Jagannadha R.; Brown, Christopher F.; Eslinger, Paul W.; Hanson, Brady D.; Huckaby, James L.; Karri, Naveen K.; Kimura, Marcia L.; Kurath, Dean E.; Minette, Michael J.

    2010-01-01

    Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed, constructed, and operated as part of a plan to respond to issue M12, 'Undemonstrated Leaching Processes' of the External Flowsheet Review Team (EFRT) issue response plan.(a) The PEP is a 1/4.5-scale test platform designed to simulate the WTP pretreatment caustic leaching, oxidative leaching, ultrafiltration solids concentration, and slurry washing processes. The PEP replicates the WTP leaching processes using prototypic equipment and control strategies. The PEP also includes non-prototypic ancillary equipment to support the core processing.

  14. Osteo-odonto-keratoprosthesis for end-stage cornea blindness.

    Science.gov (United States)

    Wong, H S; Then, K Y; Ramli, R

    2011-10-01

    We report the first case of Osteo-odonto-keratoprosthesis (OOKP) who successfully underwent surgery in Malaysia following a grade 4 (severe) chemical injury in both eyes in 2006. The patient's left eye was eviscerated and his right eye underwent penetrating keratoplasty. However, the corneal graft failed and became opaque. His right eye could only perceive light. The OOKP was offered to him hoping to recover some functional vision. He underwent a 2-stage surgery to implant the OOKP into his right eye. However, 2 months post-operation, he developed vitreous haemorrhage. A successful pars plana vitrectomy (PPV) was performed via the limited view through the lens. He attained a final visual acuity of 6/60 (N36). He was able to mobilize more independently, feed, dress himself and read large print.

  15. The Importance of Human Factor in Information Centers

    Directory of Open Access Journals (Sweden)

    Ayşe Üstün

    2000-12-01

    Enformasyon çağında, teknoloji insanların elinden mesleğini almamış, tersine nitelikli, yetenekli ve beceri sahibi insanları gerektirmiştir. Bu dönem­de “insan” öğesini ön plana çıkaran, insanı iç yapısı ile birlikte bir bütün ola­rak ele alan yaklaşımlara ve yönetim biçimlerine önem verilmeye başlanmış­tır. Çalışanlardan daha iyi sonuç almak, bilgi, yetenek ve kapasitelerini ve­rimli olarak kullanmalarını sağlamak için çeşitli yöntemlerden yararlanıl­maktadır.

  16. Planned posterior assisted levitation in severe subluxated cataract: Surgical technique and clinical results

    Directory of Open Access Journals (Sweden)

    Tova Lifshitz

    2012-01-01

    Full Text Available We report the surgical technique and outcome of planned posterior assisted levitation (P-PAL in four cases of subluxated cataract. P-PAL was planned as the preferred approach in all cases. A spatula was inserted via the pars plana, the whole lens was lifted to the anterior chamber and then removed through a scleral tunnel incision. Anterior chamber intraocular lenses were implanted in all cases. All four eyes had severe subluxation of the crystalline lenses with marked phacodonesis. Two eyes had history of blunt trauma, and the other two eyes had severe pseudoexfoliation with spontaneous lens subluxation. Follow-up ranged from 1 to 2 years in three cases. The postoperative visual acuity was 20/80 or better. No intraoperative complications were observed. In conclusion, the P-PAL technique was successfully performed during cataract surgery in four eyes with severe subluxated cataracts. There were no complications over the long-term follow-up.

  17. Delayed inflammation associated with retained perfluorocarbon liquid

    Directory of Open Access Journals (Sweden)

    S Pradeep

    2011-01-01

    Full Text Available A 55-year-old woman, with history of cataract surgery 1 year back, presented with features of ocular inflammation for last 3 months. She had no history of any other intraocular surgery. On examination, anterior segment showed frothy material in the inferior angle with moderate anterior chamber reaction (cells+/flare+ and sulcus intraocular lens with large posterior capsule rent. Fundoscopy showed multiple, small to medium-sized transparent bubbles of perfluorocarbon liquid (PFCL with membranes in the vitreous cavity. Ultrasonography confirmed the presence of PFCL in the vitreous cavity. Pars plana vitrectomy with anterior chamber wash was done which led to good visual recovery. To conclude, retained PFCL can cause late onset fibrinous inflammation after a quiescent period but surgical intervention may lead to good visual outcome.

  18. Emotional and cognitive effects of peer tutoring among secondary school mathematics students

    Science.gov (United States)

    Alegre Ansuategui, Francisco José; Moliner Miravet, Lidón

    2017-11-01

    This paper describes an experience of same-age peer tutoring conducted with 19 eighth-grade mathematics students in a secondary school in Castellon de la Plana (Spain). Three constructs were analysed before and after launching the program: academic performance, mathematics self-concept and attitude of solidarity. Students' perceptions of the method were also analysed. The quantitative data was gathered by means of a mathematics self-concept questionnaire, an attitude of solidarity questionnaire and the students' numerical ratings. A statistical analysis was performed using Student's t-test. The qualitative information was gathered by means of discussion groups and a field diary. This information was analysed using descriptive analysis and by categorizing the information. Results show statistically significant improvements in all the variables and the positive assessment of the experience and the interactions that took place between the students.

  19. A unique case of phaeohyphomycosis subretinal abscess in a patient with arthropathy and lung pathology

    Directory of Open Access Journals (Sweden)

    Bryan J Matthews

    2013-01-01

    Full Text Available A 67-year-old former gold miner with rheumatoid arthritis, treated with steroids and methotrexate, presented to eye casualty with a painful right eye. Examination revealed an anterior uveitis and despite an initial response to topical steroids, the intraocular inflammation worsened with anterior and posterior uveitis development. Re-examination showed a white mass in the peripheral nasal retina initially suspected of being active Toxoplasmosis infection and anti-toxoplasmosis treatment commenced. After improvement and tapering of this treatment, the intraocular inflammation reoccurred. Cytopathological examination of a pars plana vitrectomy obtained vitreous sample that showed a non-diagnostic non-infectious chronic vitritis. The vitreoretinal surgeons elected to do a direct biopsy of the white subretinal mass in the peripheral nasal area. This revealed, quite unexpectedly, an abscess containing pigmented phaeohyphomycosis fungi. This case report documents the multidisciplinary approach that assisted in clinching a final diagnosis and the role of sub-retinal biopsy in this unprecedented scenario.

  20. Geología y aspectos geográficos de la isla de san andrés, colombia

    OpenAIRE

    Vargas Cuervo, German

    2012-01-01

    La Isla de San Andrés ha sido definida geológicamente por varios autores en dos unidades calcáreas de características bien marcadas: Una unidad de calizas heterogéneas,denominada como Formación San Andrés de edad Mioceno y una unidad de calizas coralinas de edad Pleistoceno, conocida como Formación San Luis. La primera unidad aflora en la parte central de la isla y representa la zona de colinas suaves con alturas máximas de 87 m.s.n.m y la Formación San Luis constituye la región plana a suave...

  1. Vitreoretinal surgery in advanced coats disease.

    Science.gov (United States)

    Ozdamar, Yasemin; Berker, Nilufer; Batman, Cosar; Zilelioglu, Orhan

    2009-01-01

    To report the outcomes of vitreoretinal surgery for a patient with total retinal detachment and a subretinal nodule associated with Coats disease (CD). A 20-year-old woman stage 3B CD underwent vitreoretinal surgery with triamcinolone acetonide-assisted pars plana vitrectomy, limited retinotomy, removal of the subretinal nodule and membrane, endolaser photocoagulation, and silicone oil tamponade. The surgical outcomes were observed. Retinal attachment was achieved after vitreoretinal surgery, removal of the subretinal membrane, and endoresection of the subretinal fibrous nodule. No intraoperative or postoperative complications occurred due to the surgical technique. The retina remained attached during the postoperative follow-up period of 6 months. Vitreoretinal surgery is an effective surgical technique that provides successful reattachment of the retina and enables endoresection of the subretinal fibrous nodule in eyes with advanced CD. It also prevents the devastating intraocular complications leading to enucleation.

  2. Early surgical managment of penetrating ocular injuries involving the posterior segment.

    Science.gov (United States)

    Michels, R G

    1976-09-01

    Pars plana vitrectomy technic can be used in the early management of certain penetrating ocular injuries involving the posterior segment, including selected intraocular foreign bodies. This study reports the results of ten consecutive cases of intraocular foreign bodies in the posterior segment treated by a combination of vitrectomy (including lensectomy when necessary) and foreign-body extraction with forceps. The foreign body was successfully removed in nine of ten eyes, and nine of ten eyes were salvaged. This favorable experience using early vitreous surgery suggests that the vitrectomy technic can be used in other penetrating injuries involving the posterior segment that are not associated with intraocular foreign bodies. Possible indications for early vitrectomy are presented, including cases with a poor prognosis when managed by conventional methods.

  3. Characterization of an estuarine environment by means of an index based on intertidal macrofauna.

    Science.gov (United States)

    Conde, Anxo; Novais, Júlio M; Domínguez, Jorge

    2013-06-15

    Macrobenthic intertidal assemblages from five Atlantic Iberian estuaries were analyzed to develop an estuarine index. An R-mode analysis revealed a close association between the isopod Cyathura carinata, the polychaete Hediste diversicolor and the bivalve Scrobicularia plana. Although these species are abundant in all the estuaries considered, they tend to be absent from sites at the marine and freshwater ends of the environmental gradient. Three different ways of calculating the estuarine index are proposed. The index is comprised in the interval [0,1] and was constructed using relative abundances rather than absolute abundances. Transformation of the raw data helped improve the performance of the index. A non-parametric statistical test is proposed for application to the estuarine index to find sites with the same values after a significant omnibus test. The index appears to be a good proxy for recognizing estuarine limits by use of indicator species. Copyright © 2013 Elsevier Ltd. All rights reserved.

  4. Passivação da superfície do Germânio visando ao uso da nanoeletrônica

    OpenAIRE

    Jumir Vieira de Carvalho Júnior

    2009-01-01

    Investigamos a passivação superficial do Germânio visando ao uso em Nanoeletrônica, que requer: (i) preparação de uma superfície plana e isenta de contaminantes e (ii) crescimento ou deposição de um dielétrico termodinamicamente estável em contato com o substrato nos ambientes e temperaturas usuais na fabricação de dispositivos. Na primeira etapa do estudo, testamos diferentes hidrácidos halogênicos associados com água deionizada (DI) e soluções oxidantes para remover o óxido de germânio nati...

  5. EFRT M-12 Issue Resolution: Comparison of Filter Performance at PEP and CUF Scale

    Energy Technology Data Exchange (ETDEWEB)

    Daniel, Richard C.; Billing, Justin M.; Bontha, Jagannadha R.; Brown, Christopher F.; Eslinger, Paul W.; Hanson, Brady D.; Huckaby, James L.; Karri, Naveen K.; Kimura, Marcia L.; Kurath, Dean E.; Minette, Michael J.

    2010-01-22

    Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed, constructed, and operated as part of a plan to respond to issue M12, “Undemonstrated Leaching Processes” of the External Flowsheet Review Team (EFRT) issue response plan.(a) The PEP is a 1/4.5-scale test platform designed to simulate the WTP pretreatment caustic leaching, oxidative leaching, ultrafiltration solids concentration, and slurry washing processes. The PEP replicates the WTP leaching processes using prototypic equipment and control strategies. The PEP also includes non-prototypic ancillary equipment to support the core processing.

  6. A unique case of phaeohyphomycosis subretinal abscess in a patient with arthropathy and lung pathology.

    Science.gov (United States)

    Matthews, Bryan J; Partridge, David; Sheard, Richard M; Rennie, Ian G; Mudhar, Hardeep Singh

    2013-12-01

    A 67-year-old former gold miner with rheumatoid arthritis, treated with steroids and methotrexate, presented to eye casualty with a painful right eye. Examination revealed an anterior uveitis and despite an initial response to topical steroids, the intraocular inflammation worsened with anterior and posterior uveitis development. Re-examination showed a white mass in the peripheral nasal retina initially suspected of being active Toxoplasmosis infection and anti-toxoplasmosis treatment commenced. After improvement and tapering of this treatment, the intraocular inflammation reoccurred. Cytopathological examination of a pars plana vitrectomy obtained vitreous sample that showed a non-diagnostic non-infectious chronic vitritis. The vitreoretinal surgeons elected to do a direct biopsy of the white subretinal mass in the peripheral nasal area. This revealed, quite unexpectedly, an abscess containing pigmented phaeohyphomycosis fungi. This case report documents the multidisciplinary approach that assisted in clinching a final diagnosis and the role of sub-retinal biopsy in this unprecedented scenario.

  7. Perfluoroctano líquido como tamponante vitreorretiniano de curta duração no pós-operatório de portadores de descolamento de retina por ruptura gigante Perfluoroctane liquid as a short-term vitreous-retinal tamponade in the postoperative period in patients with retinal detachment due to giant tears

    Directory of Open Access Journals (Sweden)

    Marcelo Carvalho Ventura

    2007-06-01

    Full Text Available OBJETIVOS: Relatar os resultados de vitrectomia via pars plana com utilização de perfluocarbono líquido (Perfluoroctano-Ophtalmos®, como tamponante vítreo-retiniano de curta duração, no pós-operatório de portadores de descolamento de retina, por ruptura gigante. MÉTODOS: Estudaram-se dez desses pacientes. Todos os casos eram complicados por vitreorretinopatia proliferativa grau B ou pior com rupturas que variavam em extensão de 90º a 210º. O perfluorocarbono líquido foi introduzido, por via pars plana, com o volume necessário para ultrapassar o limite posterior da ruptura, permanecendo no pós-operatório por cinco dias, estando os pacientes em decúbito dorsal. Após esse período submetiam-se a segunda intervenção para troca do perfluorocarbono líquido para gás ou óleo de silicone. RESULTADOS: Após período de acompanhamento médio de 16,2 ± 12,4 meses (2 a 43 meses, 80% das retinas estavam aplicadas, sendo necessária a repetição desta técnica em 1 caso (10% caso e em 2 casos (20% não houve reaplicação da retina por vitreorretinopatia avançada. Houve melhora da acuidade visual em 5 casos (50%. CONCLUSÃO: Observaram-se bons resultados quanto à aplicação da retina (80% e melhora da acuidade visual (50% quando do uso do perfluorocarbono líquido como tamponante vitreorretiniano de curta duração no pós-operatório de cirurgias de descolamento de retina por rupturas gigantes.PURPOSE: To report pars plana vitrectomy results of intravitreous use of liquid perfluorocarbon as a short-term postoperative tamponade in retinal detachment due to giant tears in a series of patients. METHODS: Ten of those patients, all of them complicated by proliferative vitreoretinopathy grade B or worse, with tear extension varying from 90º to 210º were studied. Perfluorocarbon liquid was injected via pars plana until the posterior tear limit, remaining in the postoperative period during five days, with the patients in supine position

  8. Uma visualização do princípio de Huygens-Fresnel na obtenção de um padrão de difração

    OpenAIRE

    Barbosa,Valmar Carneiro; Breitschaft,Ana Maria Senra; Mendonça,José Paulo Rodrigues Furtado de; Moreira,Leonardo Marmo; Moraes,Pedro Claudio Guaranho de

    2012-01-01

    Utilizando a relação que fornece a irradiância devida à interferência de fontes pontuais, mostramos por meio de gráficos como o princípio de Huygens-Fresnel funciona quando é aplicado para determinar o padrão de difração de Fraunhofer gerado por uma onda plana que incide perpendicularmente em um anteparo que contém apenas uma fenda. Desta forma, somos capazes de identificar como se originam os picos principal e secundários de difração, o que não é entendido claramente a partir da obtenção ana...

  9. Berlin Olimpiyatları ekseninde basında Türk sporu (1936-1938)

    OpenAIRE

    GÜNGÖR, Birgül

    2009-01-01

    Olimpiyatlar her zaman kavga ve düşmanlıkların bir kenara bırakıldığı, barış, kardeşlik, dostluk duygularının ön plana çıktığı dünyanın en büyük spor organizasyonu olarak anılır. Antik çağda ilk kez Yunanistan'da gelenekselleşen Olimpiyatlar, daha sonra modern çağa ayak uydurularak her dört yılda bir, bu büyük spor şölenini organize edebilme gücüne sahip büyük...

  10. Análisis in vitro de la influencia sobre el campo de flujo de dos modelos de válvulas cardiacas mecánicas bivalvas mediante un túnel de viento

    Directory of Open Access Journals (Sweden)

    John Bustamante, O., MD., PhD

    2011-03-01

    Conclusiones: El método implementado aprovecha las características fluidodinámicas del aire en un banco de pruebas: túnel de viento, para hacer la evaluación in vitro de la influencia sobre el campo de flujo y fuerzas cortantes de diferentes modelos de válvulas cardiacas mecánicas, obteniendo mayor sensibilidad que otras alternativas disponibles. El sistema se usó para evaluar dos tipos de prótesis, mostrando que las valvas curvas tienden a presentar una menor disrupción del flujo que las valvas planas. La implementación del sistema presentado como un nuevo banco de pruebas, permite extraer conclusiones que sirven como base en el diseño de las prótesis, buscando ofrecer menor trastorno hemodinámico.

  11. Pursuing the quest for better understanding the taxonomic distribution of the system of doubly uniparental inheritance of mtDNA

    Directory of Open Access Journals (Sweden)

    Arthur Gusman

    2016-12-01

    Full Text Available There is only one exception to strict maternal inheritance of mitochondrial DNA (mtDNA in the animal kingdom: a system named doubly uniparental inheritance (DUI, which is found in several bivalve species. Why and how such a radically different system of mitochondrial transmission evolved in bivalve remains obscure. Obtaining a more complete taxonomic distribution of DUI in the Bivalvia may help to better understand its origin and function. In this study we provide evidence for the presence of sex-linked heteroplasmy (thus the possible presence of DUI in two bivalve species, i.e., the nuculanoid Yoldia hyperborea(Gould, 1841and the veneroid Scrobicularia plana(Da Costa,1778, increasing the number of families in which DUI has been found by two. An update on the taxonomic distribution of DUI in the Bivalvia is also presented.

  12. Nuevos datos sobre la distribución de Stenostoma rostratum (Fabricius, 1787 en Cataluña (nordeste de la península Ibérica (Coleoptera, Oedemeridae

    Directory of Open Access Journals (Sweden)

    Agulló, J.

    2013-02-01

    Full Text Available New data on the distribution of Stenostoma rostratum (Fabricius, 1787 in Catalonia (northeastern Iberian peninsula (Coleoptera, Oedemeridae Distribution of Stenostoma rostratum (Fabricius, 1787 in Catalonia is updated. New data were obtained from recent prospecting at two natural reserves on the Mediterranean coast, the Espais Naturals del Delta de Llobregat (province of Barcelona and the Parc Natural de les Illes Medes, Massís del Montgrí i Plana del Baix Ter (province of Girona. The species was found exclusively in sand dunes, occupying a limited area on the Catalan coast. Stenostoma rostratum is considered a threatened species in Catalonia. The latest previous records were published 40 years ago. Remarks about its habitat, ecology and conservation in both protected areas are also provided.

  13. Intravitreal Phacoemulsification Using Torsional Handpiece for Retained Lens Fragments.

    Science.gov (United States)

    Kumar, Vinod; Takkar, Brijesh

    2016-01-01

    To evaluate the results of intravitreal phacoemulsification with torsional hand piece in eyes with posteriorly dislocated lens fragments. In this prospective, interventional case series, 15 eyes with retained lens fragments following phacoemulsification were included. All patients underwent standard three-port pars plana vitrectomy and intravitreal phacoemulsification using sleeveless, torsional hand piece (OZiL™, Alcon's Infiniti Vision System). Patients were followed up for a minimum of six months to evaluate the visual outcomes and complications. The preoperative best-corrected visual acuity (BCVA) ranged from light perception to 0.3. No complications such as thermal burns of the scleral wound, retinal damage due to flying lens fragments, or difficult lens aspiration occurred during intravitreal phacoemulsification. Mean post-operative BCVA at the final follow-up was 0.5. Two eyes developed cystoid macular edema, which was managed medically. No retinal detachment was noted. Intravitreal phacoemulsification using torsional hand piece is a safe and effective alternative to conventional longitudinal phacofragmentation.

  14. Retinal Layers Measurements following Silicone Oil Tamponade for Retinal Detachment Surgery.

    Science.gov (United States)

    Jurišić, Darija; Geber, Mia Zorić; Ćavar, Ivan; Utrobičić, Dobrila Karlica

    2017-12-19

    This study aimed to investigate the influence of silicone oil on the retinal nerve fiber layer (RNFL) thickness in patients with primary rhegmatogenous retinal detachment who underwent vitreoretinal surgery. The study included 47 patients (eyes), who underwent a pars plana vitrectomy with the silicone oil tamponade. The control group included unoperated eye of all participants. Spectral-domain optical coherence tomography (SD-OCT) was used for the measurements of peripapilar and macular RNFL thickness. The average peripapillary RNFL thickness was significantly higher in the silicone oil filled eyes during endotamponade and after its removal. The eyes with elevated IOP had less thickening of the RNFL in comparison to the eyes with normal IOP. Central macular thickness and macular volume were decreased in the silicone oil filled eyes in comparison to the control eyes. In conclusion, silicone oil caused peripapilar RNFL thickening in the vitrectomized eyes during endotamponade and after silicone oil removal.

  15. Intravitreal injection of perfluoropropane for the treatment of vitreomacular traction

    Directory of Open Access Journals (Sweden)

    Xiao-Ping Wan

    2013-07-01

    Full Text Available AIM: To study the efficacy of a single intravitreal injection of perfluoropropane(C3F8in releasing vitreomacular traction. METHODS: Twelve eyes of 12 consecutive patients with vitreomacular traction received a single intravitreal injection of 0.3mL 100%(C3F8were retrospectively analyzed. The best corrected vision acuity and the neural epithelium thickness of central macular were observed. RESULTS: One month following treatment, vitreomacular traction was released in 5 eyes(42%, mean final visual acuity(VAimproved 0.04 and mean central foveal thickness decreased by 69μm. The vision acuity before and after treatment were 0.20±0.07, 0.25±0.04 respectively.CONCLUSION: Intravitreal C3F8 injection could offer a minimally invasive alternative to pars plana vitrectomy in patients with vitreomacular traction.

  16. Serratia marcescens endophthalmitis after pterygium surgery: a case report.

    Science.gov (United States)

    Yi, Myeong Yeon; Chung, Jin Kwon; Choi, Kyung Seek

    2017-11-02

    To report a case of Serratia marcescens endophthalmitis after pterygium surgery using the bare sclera technique with mitomycin C (MMC). A 69-year-old male patient underwent pterygium excision surgery using the bare sclera technique and 0.02% MMC. The patient presented with decreased visual acuity and pain from the day after the operation. Trans pars plana vitrectomy was performed and intravitreal antibiotics were administered. Cultures from the aqueous humor and intraocular lens were all positive for S. marcescens, which was sensitive to an empiric antibiotic regimen. The best corrected distant visual acuity, 1 month after treatment, was a finger count/50 cm, but the retinal layer structure and the vasculature were relatively well preserved. This is the first reported case of S. marcescens endophthalmitis after pterygium surgery. Endophthalmitis caused by S. marcescens has a devastating visual prognosis and may show a high clinical risk-benefit ratio for the application of MMC in pterygium surgery.

  17. Recent Advances and History of Vitreous Surgery

    Directory of Open Access Journals (Sweden)

    Tatsuya Mimura

    2011-01-01

    Full Text Available There have been tremendous advances in the small-gauge pars plana vitrectomy (PPV systems. This review provides an overview of the recent advances and state of the art of vitreous surgery. The two most innovative advancements that have been developed in this area are the small-gauge cutter and the new illuminating systems. Compared to the traditional 20-gauge PPV, transconjunctival sutureless small-gauge PPV is a safe and effective strategy to treat a variety of vitreoretinal diseases. Chandelier illumination allows better visualisation of vitreous for bimanual surgery. The small-gauge PPV provides benefits in terms of less inflammation, less patient discomfort, and faster recovery of the visual acuity.

  18. Branch retinal artery occlusion post-penetrating globe injury with intraocular foreign body.

    Science.gov (United States)

    Nagpal, Manish; Chaudhary, Pranita; Jain, Ashish

    2018-01-01

    Intraocular foreign body (IOFB) in cases of penetrating eye injury accounts for an important indication of vitreoretinal intervention following ocular trauma. Vascular occlusion as a complication of IOFB is rare. Here we present a case of a 34-year-old male with post-traumatic cataract and an intraocular metallic foreign body (IOFB) lodged in the superficial layers of the retina inferotemporal to the disc, causing an inferotemporal branch retinal artery occlusion. The case was managed by lensectomy with pars plana vitrectomy and IOFB removal followed by a second procedure of secondary IOL implantation. Final best-corrected visual acuity improved to 6/24. This case highlights an unusual sequelae following penetrating ocular trauma.

  19. Branch retinal artery occlusion post-penetrating globe injury with intraocular foreign body

    Directory of Open Access Journals (Sweden)

    Manish Nagpal

    2018-01-01

    Full Text Available Intraocular foreign body (IOFB in cases of penetrating eye injury accounts for an important indication of vitreoretinal intervention following ocular trauma. Vascular occlusion as a complication of IOFB is rare. Here we present a case of a 34-year-old male with post-traumatic cataract and an intraocular metallic foreign body (IOFB lodged in the superficial layers of the retina inferotemporal to the disc, causing an inferotemporal branch retinal artery occlusion. The case was managed by lensectomy with pars plana vitrectomy and IOFB removal followed by a second procedure of secondary IOL implantation. Final best-corrected visual acuity improved to 6/24. This case highlights an unusual sequelae following penetrating ocular trauma.

  20. Changes of the vasculature and innervation in the anterior segment of the RCS rat eye.

    Science.gov (United States)

    May, Christian Albrecht

    2011-12-01

    Investigating the anterior eye segment vasculature and innervation of dystrophic RCS rats, two major unique findings were observed: in the iris, young adult animals with retinal dystrophy showed an increase in substance P nerve fibres and a dilation of arterioles and capillaries. This finding continued during ageing. In the pars plana region, the surface covered by venules decreased continuously with age. In older animals, this decrease was parallelled by a local decrease of sympathetic TH-positive nerve fibres supplying these venules. For both conditions, no comparable data exists so far in the literature. They might point to a unique situation in the anterior eye segment of the dystrophic RCS rat. Copyright © 2011 Elsevier Ltd. All rights reserved.

    1. optimization

      Directory of Open Access Journals (Sweden)

      Iván Amaya

      2014-01-01

      Full Text Available Este artículo compara el algoritmo original ba sado en luciérnagas contra dos versiones su geridas por los autores. Se encontró q ue al utilizar algunas modificaciones propuestas en el documento, el tiem po de convergencia del algoritmo se reduce, mientras aumenta su precisión (es decir, converge con menos error. Por tanto, se recomienda fuertemente qu e estas variantes sean analizadas con má s detalle, especialmente para la solución de sistemas de ecuaciones no-lineales, dado que la prue ba exploratoria consignada aquí entregó b uenos resultados (es decir, las raíces encontradas por el algoritmo se encuentran muy cercanas a los valores teóricos. Además, se en contró que el algoritmo es dependi ente del tamaño del enjambre, en especial cuando se tr abaja con regiones planas.

    2. Tonic Pupil and Corneal Anesthesia after Vitrectomy and Encircling Band for Retinal Detachment in an Ex-Premature Child

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      Xavier Valldeperas

      2010-09-01

      Full Text Available An 11-year-old boy presented with a total retinal detachment in his right eye. He had a bilateral 360° argon laser treatment for an active retinopathy of prematurity performed after his birth. He underwent an uneventful pars plana vitrectomy, encircling band, 810-nm diode endolaser and heavy silicone oil (Densiron® endotamponade. A tonic pupil and abolition of corneal sensitivity, with a large epithelial defect, were observed during the postoperative period. We discuss the possible etiopathogenic mechanisms of the long and short ciliary nerves damage, and the role that retinopathy of prematurity and retinal detachment laser treatment and the encircling band placement might have played in the development of the tonic pupil and the corneal anesthesia.

    3. Recuperación del zinc de una solución de lavado del proceso de galvanización

      OpenAIRE

      García Ventura, Álvaro

      2011-01-01

      Este proyecto se basa en la recuperación de Zinc de una solución de lavado de un proceso teórico de galvanización mediante el estudio de dos métodos; el proceso de extracción líquido-líquido y el proceso de membrana plana líquida. En el proceso de extracción líquido-líquido, consta de dos procesos dentro de él, la extracción y el stripping en las que intervienen tres fases: a) fase de alimentación, la cual contiene el analito a extraer, b) fase orgánica, que contiene e...

    4. Vasoproliferative retinal tumor. Report of two cases

      International Nuclear Information System (INIS)

      Arencibia Gonzalez, Danaides; Eguia Martinez, Frank; Santana Alas, Eva

      2010-01-01

      Vasoproliferative retinal tumor is a rare and benign condition that presents as an exudative lesion in the peripheral retina. The lesion can be classified in primary (idiopathic) or secondary to other ocular processes. Therapeutic options include observation, cryotherapy, laser photocoagulation, surgical removal by pars plana vitrectomy, photodynamic therapy and epiescleral brachytheraphy with radio-active isotopes associated or not to the use of anti-angiogenic or anti-inflammatory drugs. The selection of a particular management modality depends on the type of case. Two female patients affected with this condition were presented; the most important characteristics in their clinical pictures, as well as the results of other tests as retinography, fluorescent and ICG angiography and echography were described. The management and the therapeutical and evolutive course of both patients were also discussed

    5. Corneal endothelial cell loss and corneal biomechanical characteristics after two-step sequential or combined phaco-vitrectomy surgery for idiopathic epiretinal membrane

      DEFF Research Database (Denmark)

      Hamoudi, Hassan; Christensen, Ulrik Correll; La Cour, Morten

      2017-01-01

      with non-contact specular microscopy. Pachymetry [central cornea thickness (CCT)], keratometry and cornea volume (CV) were measured with Pentacam Scheimpflug camera. Primary outcome was change in CED after 12 months; secondary outcomes were changes in CCT and CV after 12 months. RESULTS: Sixty-two eyes......PURPOSE: To assess the impact of sequential and combined surgery [cataract surgery and 23-gauge pars plana vitrectomy (PPV) with peeling] on corneal endothelium cell density (CED) and corneal biomechanical characteristics. METHODS: Phakic eyes with epiretinal membrane (ERM) were prospectively...... allocated to (i) cataract surgery and subsequent PPV (CAT group), (ii) PPV and subsequent cataract surgery (VIT group) or (iii) phacovitrectomy (COMBI group). Eyes were examined at baseline, 1 month after each surgery, and at 3 and 12 months follow-up. Corneal endothelium cell density (CED) was assessed...

    6. A 9 year-old girl with herpes simplex virus type 2 acute retinal necrosis treated with intravitreal foscarnet.

      Science.gov (United States)

      King, John; Chung, Mina; DiLoreto, David A

      2007-01-01

      A 9-year-old girl presented with a 2-week history of redness in the left eye. Examination revealed vitritis, retinal whitening, vasculitis, and optic nerve head edema. Polymerase chain reaction testing of the aqueous fluid revealed herpes simplex virus type 2. The retinitis was controlled with intravenous acyclovir and intravitreal foscarnet. The clinical course was complicated by retinal neovascularization and vitreous hemorrhage, which was treated by pars plana vitrectomy and endolaser. While there are few case reports of herpes simplex virus type 2 retinitis in children, this one is unique for the following reasons: it is the first reported case of herpes simplex virus type 2 retinitis in a child less than 10 years old without a previous history of neonatal infection or central nervous system involvement; no other children have been reported to have been treated with intravitreal foscarnet; and retinal neovascularization complicated the recovery.

    7. Foamglas D. 1. T. N.° 19 Convalidación del Agrément 1. N. L n.° 1.031. Aislamiento de cubiertas isolation pour toitures roof insulation

      Directory of Open Access Journals (Sweden)

      Editorial, Equipo

      1968-11-01

      Full Text Available Not availableEl Foamglas es un material constituido por vidrio químicamente puro, de tipo boro-silicato, inorgánico, sin adición de aglomerante. Se presenta y utiliza en placas de diferentes dimensiones estandarizadas. Estas placas se colocan en cubiertas planas o con pendiente. Se unen con betún y se recubren con una impermeabilización. Otros empleos no considerados en el presente documento son: en el doblado de muros, en las cámaras frigoríficas, en las fachadas ligeras, falsos techos, en el aislamiento de depósitos de agua y tuberías.

    8. Musical expertise induces neuroplasticity of the planum temporale.

      Science.gov (United States)

      Meyer, Martin; Elmer, Stefan; Jäncke, Lutz

      2012-04-01

      The present manuscript summarizes and discusses the implications of recent neuroimaging studies, which have investigated the relationship between musical expertise and structural, as well as functional, changes in an auditory-related association cortex, namely, the planum temporale (PT). Since the bilateral PT is known to serve as a spectrotemporal processor that supports perception of acoustic modulations in both speech and music, it comes as no surprise that musical expertise corresponds to functional sensitivity and neuroanatomical changes in cortical architecture. In this context, we focus on the following question: To what extent does musical expertise affect the functioning of the left and right plana temporalia? We discuss the relationship between behavioral, hemodynamic, and neuroanatomical data obtained from musicians in light of maturational and developmental issues. In particular, we introduce two studies of our group that show to what extent brains of musicians are more proficient in phonetic task performance. © 2012 New York Academy of Sciences.

    9. Early Decomposition of Retained Heavy Silicone Oil Droplets

      Directory of Open Access Journals (Sweden)

      Touka Banaee

      2012-01-01

      Full Text Available Purpose: To report a case of early decomposition of retained heavy silicone oil droplets. Case Report: The single highly myopic eye of a 16-year-old boy with history of scleral buckling and buckle revision developed redetachment due to inferior retinal dialysis. The patient underwent pars plana vitrectomy and injection of heavy silicone oil. Early emulsification of the silicone oil was observed following surgery, which was removed 4 weeks later in another operation. Retained heavy silicone droplets lost their heavier- than-water specific gravity within 2 months together with extensive iris depigmentation, and release of pigment granules into the anterior chamber and vitreous cavity. Conclusion: This case report demonstrates that heavy silicone oil droplets can undergo in vivo chemical decomposition with possible toxic effects on ocular tissues.

    10. ANÁLISIS DE LAS REPRESENTACIONES GEOMÉTRICAS EN LOS LIBROS DE TEXTO

      Directory of Open Access Journals (Sweden)

      Manuel Barrantes

      2015-01-01

      Full Text Available La investigación analiza y clasifica las imágenes gráficas relacionadas con la ense- ñanza-aprendizaje de la Geometría en libros de texto. Se estudian varios aspectos de las representaciones geométricas a lo largo de las unidades de geometría de los libros. Algunos de estos aspectos son la variedad de representaciones al introducir conceptos geométricos, los elementos de las imágenes que puedan derivar en dificultades en el proceso de enseñanza-aprendizaje de la Geometría, la representación plana de figuras tridimensionales y las imágenes reales que se utilizan para aludir a elementos geométricos abstractos. Se realiza una categorización que sirve como instrumento de análisis de los textos.

    11. La tutorización humana y artificial en la resolución de problemas de matemáticas

      Directory of Open Access Journals (Sweden)

      Pedro Cobo

      2005-01-01

      Full Text Available En esta comunicación analizamos las formas de interactuar de un sistema tutorial multiagente, al que llamamos AGENTGEOM, con un alumno en la resolución de un problema que compara áreas de superficies planas. En esta interacción, el alumno llega a apropiarse de habilidades estratégicas y argumentativas en la resolución de problemas. Observamos que estas apropiaciones son consecuencia de las formas de comunicación alumno-AGENTGEOM, en las que se combinan construcciones gráficas y sentencias escritas que siguen las normas del lenguaje matemático, y la emisión de mensajes escritos en lenguaje natural.

    12. Neogene tectonic block rotations and margin curvature at the Pampean flat slab segment (28º-33º SL, Argentina

      Directory of Open Access Journals (Sweden)

      M.S Japas

      2012-06-01

      Full Text Available Available paleomagnetic data from the Pampean flat slab segment reveal a heterogeneous rotation pattern that is interpreted herein as the result of the overprinting of late NNW-WNW left-lateral brittle-ductile megashear zones that would be also responsible for the continental margin bending.La base de datos paleomagnéticos disponible para el segmento de losa plana Pampeano revela un patrón de rotaciones heterogéneo como resultado de la sobreimposición de zonas de cizalla frágil-dúctiles regionales, de desplazamiento lateral izquierdo y rumbo NNO a ONO, las que habrían producido además la curvatura del margen continental.

    13. AVM ÇEVRESİNİN AVM İMAJI ÜZERİNDEKİ ETKİSİ: MÜŞTERİ DUYGULARI VE ALGILANAN KALİTENİN ROLÜ HAZCI VE FAYDACI ALIŞ-VERİŞ DEĞERLERİ ARASINDAKİ FARKLILIKLAR - THE EFFECT OF MALL ENVIRONMENT ON MALL IMAGE: THE MEDIATING ROLE OF CUSTOMER EMOTIONS AND PERCEIVED Q

      OpenAIRE

      ÇİFCİ, Sertaç; ÖZER, Alper; KOÇAK, Akın

      2012-01-01

      Özet:Tüketicilerin AVM’lere yönelik ilgisi; ulaşım,mağazaları toplu bir şekilde bulabilme ve sosyal-kültürelaktiviteler gibi nedenlerden dolayı giderek artmaktadır.Tüketicilerin tercihlerinde ön plana çıkmak isteyen AVM’leriçin en önemli kaynaklardan birisi de AVM imajıdır. Buçalışmada, AVM çevresinin, AVM imajı üzerindeki etkisiincelenmeye çalışılmıştır ve AVM çevresinin imaj üzerindekietkisinde, algılanan kalite ve müşteri duygularının ara rolleriele alınmıştır. Buna ek olarak, hazcı/faydac...

    14. Preserved scleral patch graft for unexpected extreme scleral thinning found at the scleral buckling procedure: A case report

      Directory of Open Access Journals (Sweden)

      Spela Stunf

      2011-01-01

      Full Text Available Pre-existing scleral pathology is an important risk factor for globe rupture during scleral buckling procedures. We report here, the surgical management of an unexpected scleral pathology found at the scleral buckling procedure in a retinal detachment patient. A 77-year-old white female with retinal detachment underwent a scleral buckling procedure. The surgery was converted into a scleral graft procedure, as extreme scleral thinning was found intraoperatively. An alcohol-preserved donor sclera graft was used. The second surgery for definitive retinal alignment was performed two weeks later. The presented case of an unexpected scleral pathology in a retinal detachment patient was managed with a combination of scleral grafting and pars plana vitrectomy, without any major complications. The anatomical outcome was excellent and the scleral rupture was prevented; the visual outcome was satisfactory. A conversion of the scleral buckling procedure into a scleral graft procedure has proved to be safe and effective for unexpected scleral pathology.

    15. Structural Changes of the Macula on Optical Coherence Tomography after Vitrectomy for Proliferative Diabetic Retinopathy.

      Science.gov (United States)

      Im, Jong Chan; Kim, Jong Ho; Park, Dong Ho; Shin, Jae Pil

      2017-01-01

      This study aimed to evaluate the relationship between macular structural changes and visual prognosis after pars plana vitrectomy (PPV) for proliferative diabetic retinopathy. The study included 60 eyes that had undergone PPV. Macular optical coherence tomography (OCT) findings were classified into 5 groups preoperatively and 10 groups postoperatively. Best-corrected visual acuity (BCVA) were analyzed according to pre- and postoperative OCT. From the preoperative OCT, normal fovea with/without traction, normal fovea with preretinal hemorrhage, and tractional retinal detachment involving fovea showed an increase in BCVA after PPV (all p 20/50). Subfoveal fibrosis, macular hole, loss of foveal depression, and serous foveal detachment showed poor visual prognosis (BCVA <20/100). Macular structural changes were various after PPV, and visual prognosis correlated with these changes. © 2017 S. Karger AG, Basel.

    16. Active vibration control of vehicle suspension systems using sliding modes, differential flatness and generalized proportional-integral control

      Directory of Open Access Journals (Sweden)

      Esteban Chávez Conde

      2011-01-01

      Full Text Available En este artículo se presenta un enfoque de diseño de esquemas de control activo robusto para sistemas de suspensión de vehículos, usando técnicas de control Proporcional-Integral Generalizado, modos deslizantes y planitud diferencial, para atenuar vibraciones indeseables inducidas por perturbaciones de terreno irregular. Se proponen dos esquemas de control: uno de ellos emplea mediciones de posición y de velocidad y el otro requiere únicamente mediciones de posición. Se propone la reconstrucción integral de las derivadas de la salida plana para evitar el uso de sensores de velocidad y de aceleración, así como la información de perturbaciones de terreno desconocidas.

    17. Suspected bacterial endophthalmitis following sustained-release dexamethasone intravitreal implant: a case report.

      Science.gov (United States)

      Arıkan Yorgun, Mücella; Mutlu, Melek; Toklu, Yasin; Cakmak, Hasan Basri; Cağıl, Nurullah

      2014-06-01

      A 58-year-old man admitted to our opthalmology department with the complaint of branch retinal vein occlusion. He was treated with intravitreal Ozurdex in the right eye. Two days after the injection, the patient presented with ocular pain and the visual acuity was hand movement. A diagnosis of endophthalmitis was made. We performed emergent pars plana vitrectomy (PPV) and the implant was removed from the vitreous cavity using a retinal forceps. A combination of vancomycin 1.0 mg and amikacin 0.4 mg was injected intravitreally. However, because of the blurring in the vitreus one week after the procedure, phacoemulsification and a repeat PPV was performed. Five days after the last procedure the signs and symptoms of endophthalmitis were resolved. Our case demonstrated that endophthalmitis could develop after intravitreal implantation of Ozurdex. Surgical removal of the implant and immediate vitrectomy seems to be a useful treatment option in these cases.

    18. Audel carpenter's and builder's math, plans, and specifications

      CERN Document Server

      Miller, Mark Richard

      2005-01-01

      You can count on a good planA successful building or remodeling job requires not only a plan, but also the skill to interpret it and an understanding of the mathematics behind it. Whether you are a builder by trade or a do-it-yourself carpenter by choice, turn to this newly updated guide for easy explanations of the math involved and clear instructions on developing and using the necessary plans and specifications.* Explore the different types of wood products and learn what is best for your purpose* Choose appropriate building materials for weather and other natural factors* Refresh your knowledge of fractions, ratios, geometry, and measurement* Understand how to use basic surveying tools* Become familiar with the design process and recognize various styles of architecture* Learn to read architectural drawings and work with computer design

    19. Análise biomecânica da marcha de mulheres com uso de sapatos com saltos em solo plano e inclinado

      OpenAIRE

      Silva, Glauce Gonzaga [UNESP

      2009-01-01

      É grande o número de mulheres que faz uso de sapatos com saltos na atualidade durante várias horas por dia, sendo freqüentemente sujeitas a andarem por diversos tipos de superfícies, sejam elas planas ou inclinadas, submetendo o sistema músculoesquelético a esforços variados. Os objetivos do presente estudo foram: adaptar uma esteira para realização de análise biomecânica; analisar a marcha de mulheres com uso de sapatos com saltos em comparação com a condição descalça; analisar a influência ...

    20. Autosomal dominant precocious osteoarthropathy due to a mutation of the cartilage oligomeric matrix protein (COMP) gene: further expansion of the phenotypic variations of COMP defects

      Energy Technology Data Exchange (ETDEWEB)

      Kawaji, Hiroyuki [Department of Orthopaedic Surgery, Sanyudo Hospital, 6-1-219 Chuou, Yonezawa, Yamagata 992-0045 (Japan); Nishimura, Gen [Department of Radiology, Nasu Chuou Hospital, Tochigi (Japan); Watanabe, Sobei; Sasaki, Akira; Sano, Tokuhisa [Department of Orthopaedic Surgery, Tohoku Kohsei-Nenkin Hospital, Miyagi (Japan); Mabuchi, Akihiko; Ikeda, Toshiyuki; Ikegawa, Shiro [Laboratory for Bone and Joint Diseases, SNP Research Center, Tokyo (Japan); Ohashi, Hirofumi [Division of Medical Genetics, Saitama Children' s Medical Center, Saitama (Japan)

      2002-12-01

      We report on a Japanese family of four generations with an autosomal dominant precocious osteoarthropathy. The cardinal clinical manifestations of affected individuals were painful weight-bearing large joints, which started in late childhood or adolescence. The radiological hallmarks included coxa plana, mild epiphyseal dysplasia of the knee, and round talar domes with tibiotalar slant in childhood, which evolved into degenerative joint diseases in adulthood. The disease phenotype was cosegregated with a mutation of the cartilage oligomeric matrix protein (COMP) gene in the family members, who underwent molecular evaluation. COMP mutations have been reported in a mild form of multiple epiphyseal dysplasia (MED), Ribbing type, as well as allied disorders with more severe manifestations, such as MED Fairbank type and pseudoachondroplasia. Unlike previously reported cases with the Ribbing type, the present patients did not have short stature or brachydactyly. This report expands further the phenotypic variations of COMP defects. (orig.)

    1. Scleral fixation of a single-piece multifocal intraocular lens.

      Science.gov (United States)

      Can, Ertugrul; Basaran, M Resat; Gül, Adem

      2013-01-01

      We describe an ab interno technique for injector implantation of a one-piece multifocal intraocular lens (IOL). Transscleral fixation of multifocal posterior chamber IOL implantation using an injector with ab interno technique was performed in an eye of a 9-year-old girl who had undergone pars plana lensectomy 2 years before for bilateral lens subluxation with unknown etiology. No major complications were encountered during a 3-month follow-up of the patient and excellent centration was observed during the follow-up period. Her preoperative best spectacle-corrected distance visual acuity of 20/32 improved to uncorrected distance visual acuity of 20/25. Closed-loop design of IOL served the function of eyelets and position of the IOL was provided using only a 2-point fixation. Intraoperative position adjustment of the IOL provided an excellent centralization of multifocal IOL.

    2. Vitrectorhexis and lens aspiration with posterior chamber intraocular lens implantation in spherophakia.

      Science.gov (United States)

      Al-Haddad, Christiane; Khatib, Lama

      2012-07-01

      We describe a technique that uses the vitrector to perform successful lens aspiration and posterior chamber intraocular lens (IOL) implantation in children with spherophakia and anterior lens subluxation. After an anterior chamber maintainer is placed, the ocutome is introduced through a limbal incision to perform a circular vitrectorhexis to avoid excessive manipulation of the unstable lens followed by gentle cortex aspiration. A foldable IOL is injected into the sulcus (3-piece IOL) or bag (1-piece IOL) if the capsule is sufficiently stable. Through a pars plana incision, the ocutome is then used to perform a posterior capsulotomy to prevent late posterior capsule opacification. In our patient, sulcus IOL placement was more stable than in-the-bag placement. Neither author has a financial or proprietary interest in any material or method mentioned. Copyright © 2012 ASCRS and ESCRS. Published by Elsevier Inc. All rights reserved.

    3. Geoplano in the teaching of mathematics: Perspectives and some aspects of its use in the classroom

      OpenAIRE

      Dailson Evangelista Costa; Marcos José Pereira; José Ricardo e Souza Mafra

      2011-01-01

      Este artigo apresenta uma das pesquisas realizadas na UFT pelo Programa Institucional de Bolsa de Iniciação à Docência (PIBID). O tema abordado é o ensino de Geometria Plana por meio do Geoplano. Defendemos, neste artigo, a concepção de que o ensino de matemática, a partir da utilização de materiais concretos ou manipuláveis, torna-se uma possibilidade para a ação docente. O Geoplano possibilita desenvolver uma melhor percepção visual de formas geométricas, o que facilita a construção de dete...

    4. El acceso a Internet como medida política y el apoyo de la prensa a los internautas

      Directory of Open Access Journals (Sweden)

      Dra. Concha Edo

      2000-01-01

      Full Text Available Al comenzar el pasado mes de junio, la Asociación de Internautas (AI publicó un manifiesto en el que se acusa a todos los partidos que están representados en el Parlamento de no haber cumplido la promesa electoral de facilitar a los españoles un acceso universal y barato a Internet, y han enviado miles de mensajes a distintas organizaciones y a ministerios, parlamentarios y operadores de telecomunicaciones para exigir la tarifa plana, porque el precio que tiene en España el acceso a la red está impidiendo el desarrollo de esta tecnología y nos mantiene en un lugar poco destacado dentro del contexto europeo.

    5. Isabella Cosse, Mafalda: historia social y pol

      OpenAIRE

      Langue, Frédérique

      2017-01-01

      Le dessin de presse, la caricature et la bande dessinée se situent fréquemment au confluent de plusieurs genres : expression graphique, humour (tira de humor), satire (sociale), voire dénonciation politique. Il est toutefois peu fréquent d’en dépasser les frontières nationales avant l’avènement des nouvelles technologies de l’information et l’âge d’or des réseaux sociaux. Publiés pour la première fois en 1964 dans la revue Primera Plana, les dessins de Quino – pseudonyme de Joaquín Salvador L...

    6. Dislocation of polyfocal full-optics accommodative intraocular lens after neodymium-doped yttrium aluminum garnet capsulotomy in vitrectomized eye

      Directory of Open Access Journals (Sweden)

      Kyung Tae Kang

      2013-01-01

      Full Text Available We report a case of dislocation of WIOL-CF® polyfocal full-optics intraocular lens (IOL after neodymium-doped yttrium aluminum garnet (Nd: YAG laser capsulotomy in the vitrectomized eye. At 22 months before the dislocation of the IOL, a 55-year-old male patient underwent phacoemulsification with WIOL-CF® IOL implantation in a local clinic and 10 months after the cataract surgery the patient underwent pars plana vitrectomy, endolaser photocoagulation and 14% C 3 F 8 gas tamponade for the treatment of rhegmatogenous retinal detachment. At 9 months after the vitrectomy, the patient visited our clinic for a sudden decrease of vision after Nd: YAG capsulotomy in the local clinic. On fundus examination, the dislocated IOL was identified and the Nd: YAG capsulotomy site and the larger break, which is suspected to have been a route of the dislocation were observed in the posterior capsule.

    7. Vitreous haemorrhage in massive hemorrhagic polypoidal choroidal vasculopathy: clinical characteristics and surgical outcomes: Vitreous hemorrhage in PCV.

      Science.gov (United States)

      Narayanan, Raja; Mithal, Kopal; Jalali, Subhadra; Chhablani, Jay Kumar; Mathai, Annie; Ali, Md Hasnat

      2015-01-01

      To report the outcomes of vitreous hemorrhage (VH) associated with hemorrhagic polypoidal choroidal vasculopathy (PCV). A retrospective study of 28 eyes of 27 consecutive patients of hemorrhagic PCV with VH, which were managed surgically between January 2003 and December 2011, was performed. All patients underwent pars plana vitrectomy for VH associated with PCV. The main outcome measure was best-corrected visual acuity (BCVA) at baseline, at 1, 3 and 6 months post operatively and at last follow up. The visual acuity measured on early treatment diabetic retinopathy study (ETDRS) chart improved in 16 eyes (57.1 %) by two or more lines, remained unchanged in nine eyes (32.1 %) and decreased in three (10.7 %) after surgery when compared to baseline VA. The mean baseline VA was 2.69 ± 0.57 logMAR units (hemorrhagic PCV have sustained improvement in visual acuity following surgery.

    8. Percutaneous cardiopulmonary support to treat suspected venous air embolism with cardiac arrest during open eye surgery: a case report.

      Science.gov (United States)

      Shin, Seokyung; Nam, Bokyung; Soh, Sarah; Koo, Bon-Nyeo

      2014-11-01

      We report a case of possible venous air embolism (VAE) during trans pars plana vitrectomy with air-fluid exchange of the vitreous cavity. Shortly after initiation of air-fluid exchange, decreases in end-tidal CO2, oxygen saturation, and blood pressure were observed. The patient rapidly progressed to cardiac arrest unresponsive to cardiopulmonary resuscitation, and recovered after the application of percutaneous cardiopulmonary support. Prompt termination of air infusion is needed when VAE is suspected during air-fluid exchange, and extracorporeal life support should be considered in fatal cases. Although the incidence is rare the possibility of VAE during ophthalmic surgery clearly exists, and therefore awareness and vigilant monitoring seem critical.

    9. Delayed-onset streptococcus pyogenes endophthalmitis following Ahmed glaucoma valve implantation.

      Science.gov (United States)

      Bayraktar, Zerrin; Kapran, Ziya; Bayraktar, Sükrü; Acar, Nur; Unver, Yaprak Banu; Gök, Kemran

      2005-01-01

      To report a case of delayed-onset Streptococcus pyogenes endophthalmitis following implantation of an Ahmed glaucoma valve. A 10-year-old patient presented with acute endophthalmitis 1 year after Ahmed glaucoma valve implantation. The conjunctiva and Tenon's capsule over the valve plate had been penetrated by one of the polypropylene fixation sutures. The valve was removed, and pars plana vitrectomy was performed. Vitreous specimens and removal of the discharge over the plate revealed Streptococcus pyogenes. This is the first documented case of Streptococcus pyogenes endophthalmitis following Ahmed glaucoma valve implantation. We think the conjunctival buttonhole caused by the polypropylene suture provided an entry site for the infection. (c) Japanese Ophthalmological Society 2005.

    10. submitter Proton therapy treatment monitoring with the DoPET system: activity range, positron emitters evaluation and comparison with Monte Carlo predictions

      CERN Document Server

      Muraro, S; Belcari, N; Bisogni, M G; Camarlinghi, N; Cristoforetti, L; Guerra, A Del; Ferrari, A; Fracchiolla, F; Morrocchi, M; Righetto, R; Sala, P; Schwarz, M; Sportelli, G; Topi, A; Rosso, V

      2017-01-01

      Ion beam irradiations can deliver conformal dose distributions minimizing damage to healthy tissues thanks to their characteristic dose profiles. Nevertheless, the location of the Bragg peak can be affected by different sources of range uncertainties: a critical issue is the treatment verification. During the treatment delivery, nuclear interactions between the ions and the irradiated tissues generate β+ emitters: the detection of this activity signal can be used to perform the treatment monitoring if an expected activity distribution is available for comparison. Monte Carlo (MC) codes are widely used in the particle therapy community to evaluate the radiation transport and interaction with matter. In this work, FLUKA MC code was used to simulate the experimental conditions of irradiations performed at the Proton Therapy Center in Trento (IT). Several mono-energetic pencil beams were delivered on phantoms mimicking human tissues. The activity signals were acquired with a PET system (DoPET) based on two plana...

    11. CASE REPORT OF SEVERE PROLIFERATIVE RETINOPATHY IN A PATIENT WITH CONGENITAL LIPODYSTROPHY.

      Science.gov (United States)

      Rosin, Boris; Jaouni, Tareq

      2017-08-21

      A case report of a patient with severe proliferative retinopathy due to congenital lipodystrophy. We reviewed the medical history, imaging, and surgical procedures of a 25-year-old woman with a history of congenital lipodystrophy, presenting with bilateral combined tractional and exudative retinal detachment, poorly controlled diabetes mellitus, and extreme dislipidemia. The patient underwent retinal detachment repair surgery both eyes. On the last follow-up, both retinae were flat, and visual acuity had improved in the right eye to J3 for near and finger counting 3 m for distance. Surgery combining pars plana vitrectomy and scleral bucking successfully flattened both retinae and significantly improved visual acuity in one eye in this case of bilateral retinal detachment with combined tractional and exudative components in a patient with congenital lipodystrophy. Surgical control of retinal complications is thus possible, provided there is adequate control of the underlying risk factors.

    12. Rhegmatogenous retinal detachments associated to Stickler syndrome in a tertiary eye care center in Saudi Arabia

      Directory of Open Access Journals (Sweden)

      Alshahrani ST

      2015-12-01

      Full Text Available Saeed T Alshahrani,1 Nicola G Ghazi,2 Saba Al-Rashaed2 1Ophthalmology Department, King Fahad Specialist Hospital, Dammam, 2Vitreoretinal Department, King Khaled Eye Specialist Hospital, Riyadh, Kingdom of Saudi Arabia Purpose: To investigate the clinical findings and outcomes of rhegmatogenous retinal detachment (RRD in Stickler syndrome on affected and fellow eyes that underwent prophylactic retinopexy.Patients and methods: Chart review of 70 eyes (62 patients. Incidence of RRD, postoperative visual acuity, and risk factors were evaluated.Results: Twenty-two patients (35% had RRD in the fellow eye, 37% of the eyes had cataract, 93% had macular detachment, 50% had proliferative vitreoretinopathy, and 41% had posterior vitreous detachment. Success rates were: 60% of patients after scleral buckling; 57.1% after pars plana vitrectomy; and 75% after combined scleral buckling and pars plana vitrectomy. Sixty-one (93.8% of patients had successful surgery (including second surgery. Silicone oil tamponade was significantly associated with final anatomic outcome, with a protective odds ratio of 0.11 (P=0.027. Visual acuity improved in 54% of eyes and decreased in 5%. Statistically significant associations were present for eyes with final visual acuity ≥20/200, and total retinal detachment (P<0.001; preoperative cataract (P=0.023; and proliferative vitreoretinopathy (P<0.001. RRD developed in 16/44 eyes despite laser prophylaxis.Conclusion: Prophylactic retinopexy was not beneficial for Stickler syndrome patients. Success of primary surgery for RRD remains low. The primary surgery should be vitrectomy combined with scleral buckling and silicone oil tamponade. Keywords: Stickler syndrome, retinopexy, Gulf States, Saudi Arabia, ocular genetics, arthro-ophthalmopathy, collagen disorder

    13. Eosinophilic granuloma of spine in adults: a report of 30 cases and outcome.

      Science.gov (United States)

      Huang, Wending; Yang, Xinghai; Cao, Dong; Xiao, Jianru; Yang, Mosong; Feng, Dapeng; Huang, Quan; Wu, Zhipeng; Zheng, Wei; Jia, Lianshun; Wu, Shujia

      2010-07-01

      Eosinophilic granuloma (EG) of the spine is rare, especially in adults. There had been few large and long-term studies reported in the literature. The management goals of this disease in adults are preservation of neurologic function, relief of pain and reconstruction of spinal stability. However, there are still controversies over appropriate management modality of eosinophilic granuloma. Clinical manifestations, radiographic presentations, therapeutic outcomes and follow-up findings of 30 adults who were histiologically diagnosed with spinal eosinophilic granuloma, including 28 patients who received surgical treatment at our institutions from 1985 to 2008 were reviewed retrospectively. There were 25 males and five females with a mean age of 34.5 years (range, 18-71 years). The post-operative follow-up period ranged from 2 to 22.4 years (mean, 8.3 years). Neurologic deficits developed in 21 patients, apparent kyphosis developed in four cases. In contrast to the classic feature of vertebra plana in children, we found that more severe lesions often led to asymmetric collapse in adult patients and only three patients presented with vertebra plana. Thirty-three vertebral lesions distributed throughout the spine column. Twenty-one lesions were in cervical spine, seven in the thoracic spine and five in the lumbar spine. Twenty-eight adult patients underwent surgical resection with or without chemotherapy or radiotherapy, and four (13.3%) patients had recurrence after surgery. No patient in our series died. The onset of spinal EG is insidious and mainly presents as osteolytic destruction. There is a particular high prevalence of lesions in the cervical spine and more severe lesions often led to asymmetric collapse. As the skeleton of adults is well-developed and the epiphysis has stopped growing, individualized management including surgical intervention should be considered in adult patients with spinal EG who present with neurological damage and spinal instability.

    14. Transconjunctival drainage of serous and hemorrhagic choroidal detachment.

      Science.gov (United States)

      Rezende, Flávio A; Kickinger, Mônica C; Li, Gisèle; Prado, Renata F; Regis, Luiz Gustavo T

      2012-02-01

      To describe a novel surgical technique for drainage of bullous serous and hemorrhagic choroidal detachments. A prospective, consecutive case series of 6 eyes with serous and/or hemorrhagic choroidal detachments secondary to intraocular surgery was documented to evaluate the feasibility of using the 25-gauge and 20-gauge transconjunctival trocar/cannula systems to drain choroidal detachments. Two eyes had expulsive hemorrhagic choroidal detachments and 4 eyes had serous choroidal detachments after glaucoma surgeries. A 25-gauge infusion line was placed in the anterior chamber. A 20-gauge (in eyes with hemorrhagic choroidal detachments) or a 25-gauge (in eyes with serous detachments) trocar/cannula system was inserted into the suprachoroidal space 7.0 mm from limbus. After drainage, the cannulas were removed and no sutures were placed. Pars plana vitrectomy was performed only in eyes with concomitant pathology that demanded the additional procedure. The primary outcome measure was presence of choroidal detachment at 1 week, 2 weeks, and 1 month postoperatively. Secondary outcome measures were visual acuity at 6 months and intraocular pressure at 1 week and 1, 3, and 6 months postoperatively. Drainage of hemorrhagic choroidal detachments resulted in resolution of the detachments by 1 month postoperatively. In eyes with serous detachments, resolution was achieved by 1 week postdrainage. In both groups, intraocular pressure increased to at least 10 mmHg by postoperative Week 1. The visual acuity improved in all eyes. No complications related to the transconjunctival technique were noted. Transconjunctival drainage of serous and hemorrhagic choroidal detachments seems to be a feasible and simple surgical option with minimal scleral and conjunctival damage. Pars plana vitrectomy may not be necessary when draining choroidal detachments in this manner.

    15. Bioaccumulation of heavy metals by the flora and benthic macrofauna of the Bouregreg estuary wetland

      Directory of Open Access Journals (Sweden)

      Khamar M.

      2018-01-01

      Full Text Available Estuarine systems account for a high proportion of wetlands in Morocco due to the development of the river system. These estuarine and coastal Moroccan environments are as rich in fauna and flora as their European equivalents and present much originality. However, these coastal areas are generally highly urbanized and industrialized, and therefore subject to domestic and industrial discharges. The Bouregreg Estuary represents a good example of this situation, in view of this pollution (organic, chemical and biological and the absence of fresh water supply upstream of the estuary after the dam was built, is increasingly unable of restoring the equilibrium of this ecosystem. This tide can instead ensure the polluting discharge downstream or upstream. Metallic contamination affects the different compartments of the estuarine ecosystem (sediment, water and benthic species (fauna and flora. The objective of this study is to assess the accumulation and bioaccumulation of five heavy metals (Cu, Fe, Zn, Cr and Pb at the sediment level of two dominant plant species (Artiplex portulacoides and Sarcocornia fructicosa and three species of benthic macrofauna (Scrobicularia plana, Venerupis decussata and Hediste diversicolor from the wetland of this estuary. This work will enable us to clearly understand the nutritional relationships between plant, animal, water and sediment species. The results of the analysis revealed that bioaccumulation varies from one species to another and from one metal to another. Thus, the levels of Lead and Chromium at Sarcocornia fructicosa are higher than those found at Artiplex portulacoides. Nevertheless, the latter accumulates better the other metals: Cu, Zn and Fe. While, the macrofauna shows a fairly large variation depending on the life style and sensitivity of species. Thus, Hediste diversicolor showed high levels of the various metals analyzed compared to Scrobicularia plana and Venerupis decussata.

    16. Dosimetric Implications of an Injection of Hyaluronic Acid for Preserving the Rectal Wall in Prostate Stereotactic Body Radiation Therapy

      Energy Technology Data Exchange (ETDEWEB)

      Chapet, Olivier, E-mail: olivier.chapet@chu-lyon.fr [Department of Radiation Oncology, Centre Hospitalier Lyon Sud, Pierre Benite (France); Udrescu, Corina [Department of Radiation Oncology, Centre Hospitalier Lyon Sud, Pierre Benite (France); Department of Medical Physics, Centre Hospitalier Lyon Sud, Pierre Benite (France); Tanguy, Ronan [Department of Radiation Oncology, Centre Hospitalier Lyon Sud, Pierre Benite (France); Ruffion, Alain [Department of Urology, Centre Hospitalier Lyon Sud, Pierre Benite (France); Fenoglietto, Pascal [Department of Radiation Oncology, Centre Val d' Aurelle, Montpellier (France); Sotton, Marie-Pierre [Department of Medical Physics, Centre Hospitalier Lyon Sud, Pierre Benite (France); Devonec, Marian [Department of Urology, Centre Hospitalier Lyon Sud, Pierre Benite (France); Colombel, Marc [Department of Urology, Hopital Edouard Herriot, Lyon (France); Jalade, Patrice [Department of Medical Physics, Centre Hospitalier Lyon Sud, Pierre Benite (France); Azria, David [Department of Radiation Oncology, Centre Val d' Aurelle, Montpellier (France)

      2014-02-01

      Purpose: This study assessed the contribution of ahyaluronic acid (HA) injection between the rectum and the prostate to reducing the dose to the rectal wall in stereotactic body radiation therapy (SBRT). Methods and Materials: As part of a phase 2 study of hypofractionated radiation therapy (62 Gy in 20 fractions), the patients received a transperineal injection of 10 cc HA between the rectum and the prostate. A dosimetric computed tomographic (CT) scan was systematically performed before (CT1) and after (CT2) the injection. Two 9-beam intensity modulated radiation therapy-SBRT plans were optimized for the first 10 patients on both CTs according to 2 dosage levels: 5 × 6.5 Gy (PlanA) and 5 × 8.5 Gy (PlanB). Rectal wall parameters were compared with a dose–volume histogram, and the prostate–rectum separation was measured at 7 levels of the prostate on the center line of the organ. Results: For both plans, the average volume of the rectal wall receiving the 90% isodose line (V90%) was reduced up to 90% after injection. There was no significant difference (P=.32) between doses received by the rectal wall on CT1 and CT2 at the base of the prostate. This variation became significant from the median plane to the apex of the prostate (P=.002). No significant differences were found between PlanA without HA and PlanB with HA for each level of the prostate (P=.77, at the isocenter of the prostate). Conclusions: HA injection significantly reduced the dose to the rectal wall and allowed a dose escalation from 6.5 Gy to 8.5 Gy without increasing the dose to the rectum. A phase 2 study is under way in our department to assess the rate of acute and late rectal toxicities when SBRT (5 × 8.5 Gy) is combined with an injection of HA.

    17. Dosimetric Implications of an Injection of Hyaluronic Acid for Preserving the Rectal Wall in Prostate Stereotactic Body Radiation Therapy

      International Nuclear Information System (INIS)

      Chapet, Olivier; Udrescu, Corina; Tanguy, Ronan; Ruffion, Alain; Fenoglietto, Pascal; Sotton, Marie-Pierre; Devonec, Marian; Colombel, Marc; Jalade, Patrice; Azria, David

      2014-01-01

      Purpose: This study assessed the contribution of ahyaluronic acid (HA) injection between the rectum and the prostate to reducing the dose to the rectal wall in stereotactic body radiation therapy (SBRT). Methods and Materials: As part of a phase 2 study of hypofractionated radiation therapy (62 Gy in 20 fractions), the patients received a transperineal injection of 10 cc HA between the rectum and the prostate. A dosimetric computed tomographic (CT) scan was systematically performed before (CT1) and after (CT2) the injection. Two 9-beam intensity modulated radiation therapy-SBRT plans were optimized for the first 10 patients on both CTs according to 2 dosage levels: 5 × 6.5 Gy (PlanA) and 5 × 8.5 Gy (PlanB). Rectal wall parameters were compared with a dose–volume histogram, and the prostate–rectum separation was measured at 7 levels of the prostate on the center line of the organ. Results: For both plans, the average volume of the rectal wall receiving the 90% isodose line (V90%) was reduced up to 90% after injection. There was no significant difference (P=.32) between doses received by the rectal wall on CT1 and CT2 at the base of the prostate. This variation became significant from the median plane to the apex of the prostate (P=.002). No significant differences were found between PlanA without HA and PlanB with HA for each level of the prostate (P=.77, at the isocenter of the prostate). Conclusions: HA injection significantly reduced the dose to the rectal wall and allowed a dose escalation from 6.5 Gy to 8.5 Gy without increasing the dose to the rectum. A phase 2 study is under way in our department to assess the rate of acute and late rectal toxicities when SBRT (5 × 8.5 Gy) is combined with an injection of HA

    18. AVALIAÇÃO AUTOMÁTICA DA ACURÁCIA RELATIVA DE DADOS LIDAR AEROTRANSPORTADO

      Directory of Open Access Journals (Sweden)

      Gabriel Dresch

      Full Text Available Neste trabalho é proposto um método automático para o controle da acurácia relativa de dados LiDAR (Light Detection and Ranging aerotransportados usando superfícies planas, linhas retas e pontos. Primeiramente, é realizada uma filtragem dos dados LiDAR, através do filtro morfológico progressivo e o filtro RANSAC (Random Sample Consensus. Em seguida, as superfícies planas são extraídas automaticamente sobre os telhados encontrados nas faixas adjacentes através do algoritmos crescimento de região. Posteriormente, as correspondências entre as feições extraídas em cada faixa são estabelecidas e os parâmetros de transformação são estimados através de uma variante do método ICP. Finalmente, para avaliar simultaneamente a acurácia plani-altimétrica dos dados LiDAR são empregadas linhas retas extraídas a partir da interseção de planos adjacentes. Para avaliar o método proposto foi conduzido um experimento com dados LiDAR obtidos numa região urbanizada recoberta por 2 faixas com densidade de 1 ponto/m². A avaliação da acurácia relativa desses dados é realizada automaticamente e os resultados obtidos com o método proposto mostraram que a média das distâncias ponto-a-plano é de -0,0019 cm e a raiz quadrada do erro médio quadrático é de 6,04 cm.

    19. Euler: programa didáctico de elementos finitos

      Directory of Open Access Journals (Sweden)

      Dorian Luis Linero Segrera

      2000-07-01

      Full Text Available Este artículo muestra las características del programa Euler como herramienta para el aprendizaje del método de los elementos finitos, con énfasis en el análisis estructural. Euler puede resolver entre otros los siguientes problemas: análisis matricial estático de armaduras y pórticos planos, análisis de estabilidad, evaluación de frecuencias y modos de vibración en pórticos planos, deformaciones en vigas y en elementos sometidos a fuerza axial y otros problemas controlados por la ecuación diferencial de campo unidimensional indicada en este artículo. Además, se pueden solucionar problemas de torsión en secciones no circulares, flujo potencial, transferencia de calor y otros problemas controlados por la ecuación diferencial de campo bidimensional mostrada en este documento. También es posible resolver problemas de elasticidad bidimensional en condición plana de esfuerzos y en condición plana de deformaciones. Al operar el programa, el usuario debe escribir una de las instrucciones necesarias para obtener las cantidades de interés. Las instrucciones disponibles se clasifican así: edición de matrices, operaciones matriciales básicas, solución de sistemas de ecuaciones simultáneas, ensamblaje de matrices y vectores, numeración de grados de libertad, valores y vectores propios. Existen también instrucciones para la creación de matrices elementales como: funciones de forma, matriz gradiente, matriz de rigidez, vector de términos independientes, contribución interelemental, matriz de transformación y matriz de constantes elásticas.

    20. Value of optical coherence tomography in the detection of macular pathology before the removal of silicone oil

      Directory of Open Access Journals (Sweden)

      Rashad MA

      2016-01-01

      Full Text Available Mohammad Ahmad Rashad, Ahmed Abdel Aliem Mohamed, Asmaa Ismail Ahmed Department of Ophthalmology, Faculty of Medicine, Ain Shams University, Cairo, Egypt Purpose: To assess the pathological macular changes with optical coherence tomography (OCT before the removal of silicone oil (SiO in eyes that had undergone pars plana vitrectomy for complicated forms of retinal detachment (RD.Patients and methods: Subjects included 48 patients (51 eyes with complicated RD including proliferative vitreoretinopathy, proliferative diabetic retinopathy, recurrent RD, penetrating trauma, uveitis, giant retinal tears, and macular holes. All the eyes had undergone SiO injection. Furthermore, all eyes had been planned for the removal of SiO 6–12 months after the primary surgery. Finally, all eyes had a fundus examination and OCT examination before the silicone oil removal.Results: OCT findings indicated epiretinal membrane in 41% of the eyes, macular edema in 17%, macular detachment in 13.5%, macular thinning in 13.5%, macular holes in 10%, and subretinal membranes in 2%. Preoperative OCT was normal in only 12% of the eyes, while a clinical fundus examination was normal in 43% (P<0.001. Eyes with normal OCT had significantly better mean logMAR (0.35 than eyes with pathological changes detected through OCT (1.28; P<0.001. Surgical modifications were made during the removal of SiO in 74.5% of the eyes.Conclusion: OCT detected significantly more pathological changes than a clinical fundus examination. This had an impact on both surgical step modification during the removal of SiO and predictability of visual outcome after the removal of SiO. Keywords: optical coherence tomography, silicone oil, pars plana vitrectomy, proliferative vitreoretinopathy, proliferative diabetic retinopathy

    1. Impact of duration of macula-off retinal detachment on visual outcome: a systematic review and meta-analysis of literature.

      Science.gov (United States)

      van Bussel, Erik M; van der Valk, Rikkert; Bijlsma, Ward R; La Heij, Ellen C

      2014-10-01

      To systematically review the influence of the lag time between macula-off retinal detachment and surgical intervention on postoperative visual acuity as main outcome measure. Systematic review and meta-analysis of articles published from 1995 to October 2013 of patients with macula-off retinal detachment and treated with scleral buckling or pars plana vitrectomy. Eligible data were pooled in a meta-analysis, analyzing the odds ratio between different durations of ≤ 3, ≤ 4, ≤ 7, and ≤ 10 days, comparing a final visual acuity of ≤ 0.4 logMAR with >0.4 logMAR, using a random-effects model. Last, the number needed to treat was calculated. Fourteen articles were eligible, of which 9 studies contained data that were suitable for meta-analysis. Patients who were operated with scleral buckling (n = 602) within 3 days since macular detachment had a statistically significant better chance of reaching a final visual acuity of 0.4 logMAR or better compared with a longer duration of macular detachment, with an odds ratio for ≤ 3 days versus 4 days to 7 days of 2.86 (95% confidence interval, 1.37-5.99) and an odds ratio for ≤ 3 days versus >3 days of 3.09 (95% confidence interval, 1.56-6.12), and with a number needed to treat of 4. For pars plana vitrectomy, the limited amount of data precluded a meta-analysis with substantial results. This meta-analysis suggests that scleral buckling for macular detachment must preferably be performed within 3 days to optimize visual outcome.

    2. Intravitreal methotrexate infusion for proliferative vitreoretinopathy

      Directory of Open Access Journals (Sweden)

      Sadaka A

      2016-09-01

      Full Text Available Ama Sadaka,1 Robert A Sisk,1–3 James M Osher,1,3 Okan Toygar,4 Melinda K Duncan,5 Christopher D Riemann1,3 1Department of Ophthalmology, University of Cincinnati College of Medicine, 2Department of Opthalmology, Cincinnati Children’s Hospital Medical Center, 3Cincinnati Eye Institute, Cincinnati, OH, USA; 4Department of Ophthalmology, Bahcesehir University Medical Faculty, Istanbul, Turkey; 5Department of Biological Sciences, University of Delaware, Newark, DE, USA Purpose: The purpose of this study was to evaluate intravitreal methotrexate infusion (IMI during pars plana vitrectomy (PPV for retinal detachment in patients with high risk for the development of proliferative vitreoretinopathy (PVR.Methods: Patients presenting with severe recurrent PVR with tractional retinal detachment and/or a history of severe ocular inflammation were treated with IMI. Clinical outcomes were determined from a retrospective medical chart review.Results: Twenty-nine eyes presenting with either tractional retinal detachment and recurrent PVR (n=22 or a history of severe inflammation associated with high PVR risk (n=7 received IMI during PPV. Best-corrected visual acuity at 6 months was ≥20/200 in 19 of 29 eyes (66% and remained stable or improved compared with initial presentation in 24 of 29 eyes (83%. At the last follow-up examination, the retinas of 26 of 29 eyes (90% remained attached after IMI while three eyes required another reattachment procedure. Three additional eyes (10% developed recurrent limited PVR without recurrent RD and were observed. No complications attributable to IMI occurred during a mean follow-up of 27 months.Conclusion: Eyes at high risk for PVR development due to a history of prior PVR or intraocular inflammation had a low incidence of PVR following IMI at the time of PPV for RD repair. No significant safety issues from IMI were observed in this series. Keywords: tractional retinal detachment, recurrent retinal detachment, pars

    3. Retinal detachment in paediatric patients

      International Nuclear Information System (INIS)

      Zafar, S. N.; Qureshi, N.; Azad, N.; Khan, A.

      2013-01-01

      Objective: To assess the causes of retinal detachment in children and the various operative procedures requiring vitreoretinal surgical intervention for the same. Study Design: Case series. Place and Duration of Study: Department of Ophthalmology, Al-Shifa Trust Eye Hospital, Rawalpindi, from January 2006 to May 2009. Methodology: A total of 281 eyes of 258 patients, (aged 0 - 18 years) who underwent vitreo-retinal surgical intervention for retinal detachment were included. Surgical log was searched for the type of retinal detachment and its causes. Frequencies of various interventions done in these patients viz. vitrectomy, scleral buckle, use of tamponading agents, laser photocoagulation and cryotherapy were noted. Results were described as descriptive statistics. Results: Myopia was the cause in 62 (22.1%) and trauma in 51 (18.1%) of the eyes. Total retinal detachment (RD) was treated in 94 (33.5%) eyes, sub total RD in 36 (12.8%), recurrent RD in 32 (11.4%), giant retinal tear in 28 (10%), tractional RD in 15 (5.3%) and exudative RD in 2 (0.7%). Prophylactic laser or cryotherapy was applied in 74 (26.3%) of the eyes. Pars plana vitrectomy (PPV) was carried out in 159 (56.6%) eyes while scleral buckle procedure was done in 129 (45.9%) eyes. Silicon oil was used in 149 (53%), perfluorocarbon liquid in 32 (11.4%) and gas tamponade in 20 (7.1%) eyes. Conclusion: The most common cause of retinal detachment in paediatric patients was myopia, followed by trauma. Total RD was more common as compared to the other types. The most common procedure adopted was pars plana vitrectomy followed by scleral buckle procedure. (author)

    4. Imaging of chronic recurrent multifocal osteomyelitis of childhood first presenting with isolated primary spinal involvement

      International Nuclear Information System (INIS)

      Anderson, S.E.; Heini, P.; Kalbermatten, D.; Sauvain, M.J.; Stauffer, E.; Geiger, L.; Johnston, J.O.; Roggo, A.; Steinbach, L.S.

      2003-01-01

      Initial presentation with primary spinal involvement in chronic recurrent multifocal osteomyelitis of childhood (CRMO) is rare. Our objective was to review the imaging appearances of three patients who had CRMO who initially presented with isolated primary spinal involvement.Design and patients The imaging, clinical, laboratory and histology findings of the three patients were retrospectively reviewed. Imaging included seven spinal MR imaging scans, one computed tomography scan, nine bone scans, two tomograms and 16 radiographs. These were reviewed by two musculoskeletal radiologists and a consensus view is reported. All three patients presented with atraumatic spinal pain and had extensive bone spinal pathology. The patients were aged 11, 13 and 12 years. There were two females and one male.Results and conclusions The initial patient had thoracic T6 and T8 vertebra plana. Bone scan showed additional vertebral body involvement. Follow-up was available over a 3 year period. The second patient had partial collapse of T9 and, 2 years later, of C6. Subsequently extensive multifocal disease ensued and follow-up was available over 8 years. The third patient initially had L3 inferior partial collapse and 1 year later T8 involvement with multifocal disease. Follow-up was available over 3 years. The imaging findings of the three patients include partial and complete vertebra plana with a subchondral line adjacent to endplates associated with bone marrow MR signal alterations. Awareness of the imaging appearances may help the radiologist to include this entity in the differential diagnosis in children who present with spinal pathology and no history of trauma. Histopathological examination excludes tumor and infection but with typical imaging findings may not always be necessary. (orig.)

    5. A mollusk VDR/PXR/CAR-like (NR1J) nuclear receptor provides insight into ancient detoxification mechanisms

      Energy Technology Data Exchange (ETDEWEB)

      Cruzeiro, Catarina, E-mail: catarinarcruzeiro@hotmail.com [ICBAS - Institute of Biomedical Sciences Abel Salazar, U. Porto - University of Porto (Portugal); CIIMAR/CIMAR - Interdisciplinary Center of Marine and Environmental Research, U. Porto (Portugal); Lopes-Marques, Mónica, E-mail: monicaslm@hotmail.com [ICBAS - Institute of Biomedical Sciences Abel Salazar, U. Porto - University of Porto (Portugal); CIIMAR/CIMAR - Interdisciplinary Center of Marine and Environmental Research, U. Porto (Portugal); Ruivo, Raquel, E-mail: ruivo.raquel@gmail.com [CIIMAR/CIMAR - Interdisciplinary Center of Marine and Environmental Research, U. Porto (Portugal); Rodrigues-Oliveira, Nádia, E-mail: nadia.oliveira@ciimar.up.pt [CIIMAR/CIMAR - Interdisciplinary Center of Marine and Environmental Research, U. Porto (Portugal); Santos, Miguel M., E-mail: santos@ciimar.up.pt [CIIMAR/CIMAR - Interdisciplinary Center of Marine and Environmental Research, U. Porto (Portugal); FCUP - Faculty of Sciences, Department of Biology, U. Porto (Portugal); Rocha, Maria João, E-mail: mjsrocha@netcabo.pt [ICBAS - Institute of Biomedical Sciences Abel Salazar, U. Porto - University of Porto (Portugal); CIIMAR/CIMAR - Interdisciplinary Center of Marine and Environmental Research, U. Porto (Portugal); Rocha, Eduardo, E-mail: erocha@icbas.up.pt [ICBAS - Institute of Biomedical Sciences Abel Salazar, U. Porto - University of Porto (Portugal); CIIMAR/CIMAR - Interdisciplinary Center of Marine and Environmental Research, U. Porto (Portugal); Castro, L. Filipe C., E-mail: filipe.castro@ciimar.up.pt [CIIMAR/CIMAR - Interdisciplinary Center of Marine and Environmental Research, U. Porto (Portugal); FCUP - Faculty of Sciences, Department of Biology, U. Porto (Portugal)

      2016-05-15

      Highlights: • A nuclear receptor orthologue of the NR1J group is isolated from a mollusc. • The molluscan NR1J transactivates gene expression upon exposure to okadaic acid but not a pesticide, esfenvarelate and triclosan. • Lineage specific gene duplications and gene loss have occurred in the NR1J of protostomes with likely impacts on detoxification mechanisms. - Abstract: The origin and diversification of the metazoan endocrine systems represents a fundamental research issue in biology. Nuclear receptors are critical components of these systems. A particular group named VDR/PXR/CAR (NR1I/J) is central in the mediation of detoxification responses. While orthologues have been thoroughly characterized in vertebrates, a sparse representation is currently available for invertebrates. Here, we provide the first isolation and characterization of a lophotrochozoan protostome VDR/PXR/CAR nuclear receptor (NR1J), in the estuarine bivalve the peppery furrow shell (Scrobicularia plana). Using a reporter gene assay, we evaluated the xenobiotic receptor plasticity comparing the human PXR with the S. plana NR1Jβ. Our results show that the molluscan receptor responds to a natural toxin (okadaic acid) in a similar fashion to that reported for other invertebrates. In contrast, the pesticide esfenvalerate displayed a unique response, since it down regulated transactivation at higher concentrations, while for triclosan no response was observed. Additionally, we uncovered lineage specific gene duplications and gene loss in the gene group encoding NRs in protostomes with likely impacts on the complexity of detoxification mechanisms across different phyla. Our findings pave the way for the development of multi-specific sensor tools to screen xenobiotic compounds acting via the NR1I/J group.

    6. Distribución espacial del Bosque Seco Tropical en el Valle del Cauca, Colombia

      Directory of Open Access Journals (Sweden)

      Diana Patricia Alvarado-Solano

      2015-09-01

      Full Text Available En el departamento del Valle del Cauca, la distribución de Bosque Seco Tropical (BsT se ha asociado al valle geográfico del río Cauca ubicado en la zona plana. Actualmente en esta zona, su cobertura se ha reducido a pocos relictos que se encuentran bajo alguna figura de conservación y mantienen áreas representativas de las formaciones vegetales sssstípicas de este bioma. Este trabajo se enfocó en el reconocimiento de la distribución espacial de formaciones vegetales de BsT en el departamento del Valle del Cauca. Se empleó información cartográfica secundaria para reconocer los biomas, ecosistemas y usos del suelo del área de estudio y en zonas adyacentes del piedemonte y montañas. Un modelo digital de elevaciones fue utilizado para realizar análisis altitudinales. En un sistema de información geográfico se aplicaron técnicas de geoprocesamiento y análisis geoespacial entre la información cartográfica y satelital. Los resultados evidencian que pese al avanzado deterioro de las coberturas de bosque seco en la zona plana, alrededor del 80 % se localiza en ecosistemas de montaña, específicamente en zonas de transición hacia bosques húmedos. A futuro, el potencial de estas áreas deberá evaluarse para ser incluidas en estrategias de conservación y restauración del bosque seco así como en el diseño de procesos adaptativos frente al cambio climático.

    7. Visualizing Macular Structures During Membrane Peeling Surgery With an Intraoperative Spectral-Domain Optical Coherence Tomography Device.

      Science.gov (United States)

      Leisser, Christoph; Hackl, Christoph; Hirnschall, Nino; Luft, Nikolaus; Döller, Birgit; Draschl, Petra; Rigal, Karl; Findl, Oliver

      2016-04-01

      The aim of this study was to examine the quality of intraoperative visualization of the posterior hyaloid, epiretinal membrane (ERM), inner limiting membrane (ILM), and hyporeflective subfoveal zone with a commercially available, microscope-integrated spectral-domain OCT setup (mi-SD-OCT) (Rescan 700; Carl Zeiss Meditec AG, Germany). Twenty patients prospectively scheduled for pars plana vitrectomy with membrane peeling due to an idiopathic ERM were included. Standard 23-gauge, three-port pars plana vitrectomy with membrane peeling and staining of the ERM with a trypan blue-based chromovitrectomy dye was performed in all cases. Intraoperative SD-OCT was performed before and after peeling and visualization of the posterior hyaloid, ERM, ILM, and presence of subfoveal hyporeflective zones were examined. OCT follow-ups were performed 2 days and 3 months after surgery. The study was approved by the local ethics committee of the city of Vienna. Successful intraoperative visualization of ERM by mi-SD-OCT was possible in all cases. The posterior hyaloid and ILM could not be seen in the mi-SD-OCT scans, whereas an intraoperative subfoveal hyporeflective zone presented in 35% of cases. In 12.5% an independent subfoveal hyporeflective zone presented postoperatively. Visual acuity improved in 93.8% of patients after surgery. mi-SD-OCT appears to be a valuable tool for intraoperative visualization of the ERM and offers immediate visualization of retinal anatomy during peeling. Therefore, it adds to the understanding of intraoperative traumatic changes due to the peeling procedure. Copyright 2016, SLACK Incorporated.

    8. Microvascular changes after vitrectomy with internal limiting membrane peeling: an optical coherence tomography angiography study.

      Science.gov (United States)

      Mastropasqua, Leonardo; Borrelli, Enrico; Carpineto, Paolo; Toto, Lisa; Di Antonio, Luca; Mattei, Peter A; Mastropasqua, Rodolfo

      2017-06-19

      To evaluate superficial capillary plexus (SCP) changes occurring after internal limiting membrane (ILM) peeling for the treatment of idiopathic epiretinal membrane (ERM). A total of 15 eyes of 15 patients affected by idiopathic ERM (eight males and seven females; mean age 59.8 ± 9.6 years) were enrolled in the study. Patients were treated with pars plana vitrectomy followed by ERM and ILM peeling. Subjects were evaluated at baseline and at the week-1 and month-1 follow-up visits. At each visit, patients were evaluated with a complete ophthalmologic evaluation, which included imaging with optical coherence tomography angiography. Overall, the SCP vessel density was 43.0 ± 3.0% at baseline and was stable throughout the follow-up (40.0 ± 4.0% at week-1 and 41.0 ± 4.0% at month-1 follow-up visits; p = 0.087 and p = 0.426, respectively). Nevertheless, the SCP vessel density was reduced at week-1 visit in both the superior and inferior sectors. In these sectors, the superficial vessel density was still reduced at the month-1 follow-up visit. We observed a reduction in the SCP vessel density occurring after pars plana vitrectomy with ILM peeling. The reduction is referred to those areas where other changes (e.g., swelling of the arcuate nerve fiber layer) have been already described. In theory, superficial vessel density modifications may be due to the direct surgical trauma to the inner retina, where the superficial plexus is contained, during the ILM grasping.

    9. A mollusk VDR/PXR/CAR-like (NR1J) nuclear receptor provides insight into ancient detoxification mechanisms

      International Nuclear Information System (INIS)

      Cruzeiro, Catarina; Lopes-Marques, Mónica; Ruivo, Raquel; Rodrigues-Oliveira, Nádia; Santos, Miguel M.; Rocha, Maria João; Rocha, Eduardo; Castro, L. Filipe C.

      2016-01-01

      Highlights: • A nuclear receptor orthologue of the NR1J group is isolated from a mollusc. • The molluscan NR1J transactivates gene expression upon exposure to okadaic acid but not a pesticide, esfenvarelate and triclosan. • Lineage specific gene duplications and gene loss have occurred in the NR1J of protostomes with likely impacts on detoxification mechanisms. - Abstract: The origin and diversification of the metazoan endocrine systems represents a fundamental research issue in biology. Nuclear receptors are critical components of these systems. A particular group named VDR/PXR/CAR (NR1I/J) is central in the mediation of detoxification responses. While orthologues have been thoroughly characterized in vertebrates, a sparse representation is currently available for invertebrates. Here, we provide the first isolation and characterization of a lophotrochozoan protostome VDR/PXR/CAR nuclear receptor (NR1J), in the estuarine bivalve the peppery furrow shell (Scrobicularia plana). Using a reporter gene assay, we evaluated the xenobiotic receptor plasticity comparing the human PXR with the S. plana NR1Jβ. Our results show that the molluscan receptor responds to a natural toxin (okadaic acid) in a similar fashion to that reported for other invertebrates. In contrast, the pesticide esfenvalerate displayed a unique response, since it down regulated transactivation at higher concentrations, while for triclosan no response was observed. Additionally, we uncovered lineage specific gene duplications and gene loss in the gene group encoding NRs in protostomes with likely impacts on the complexity of detoxification mechanisms across different phyla. Our findings pave the way for the development of multi-specific sensor tools to screen xenobiotic compounds acting via the NR1I/J group.

    10. Role of avastin on the incidence of post-operative vitreous hemorrhage after vitrectomy in diabetic vitreous hemorrhage

      International Nuclear Information System (INIS)

      Ahmed, N.; Shaheer, M.; Tahir, M.Y.

      2014-01-01

      Diabetic retinopathy is one of the most common cause of legal blindness. Five to 10% of diabetic patients suffer from the proliferative diabetic retinopathy which includes the formation of new vessels on the retina and optic disc which can be complicated as vitreous hemorrhage and tractional retinal detachment. Pars plana vitrectomy along with laser photocoagulation is being used for the management of vitreous hemorrhage. In our study we used injection avastin one week before surgery to see its role on the incidence of rebleed after vitrectomy in diabetic vitreous hemorrhage. Materials and Methods; Fifty patients were divided into 2 equal groups on the basis of simple random sampling. 25 patients in Group I were operated with routine pars plana vitrectomy with endolaser photo- coagulation while in Group II all the 25 patients were given injection avastin intra-vitreally one week before surgery. Evaluation was done on the first post operative day, first follow up visit (one week) and after one month to see the incidence of re-bleed. Chi-square test was used for statistical analysis. Results: Fifty patients divided into two groups. In Group I, 3 patients had recurrent vitreous hemorrhage on first post-operative day, 3 patients had re-bleed on first follow up visit, and only 2 patients had re-bleed after one month. In Group II, none of the patients had recurrent vitreous hemorrhage on first post-operative day and on first follow-up visit (one week) while 2 patients had re-bleed after one month. Conclusion: Injection intravitreal Avastin (Bevaci- zumab) one week before surgery significantly reduces the risk of vitreous hemorrhage after vitrectomy in diabetic patients. (author)

    11. Application of a solar refrigeration system by absorption for the air conditioning of buildings

      Energy Technology Data Exchange (ETDEWEB)

      Machielsen, Cees H. M [Delft University of Technology, Mekelweg (Netherlands); Hagendijk, Andre E [Consultancy and Research (Netherlands)

      2000-07-01

      durante todo el ano . Mas aun los hoteles y las oficinas en esta area usan mas del 40% de su energia para propositos de acondicionamiento de aire. Por lo tanto los sistemas de acondicionamiento de aire ayudados por energia solar son una opcion logica para reducir la demanda de energia y bajar los picos de electricidad reduciendo la demanda de la central electrica local. Ceeran Ltd. tiene el objetivo de lograr una completa comercializacion de las tecnologias propuestas en el Caribe Holandes. La investigacion esta concentrada en maquinas de absorcion liquida y sistemas de recoleccion solar tales como placas planas con superficies selectivas, tubos de calor evacuados, y conectores de placa plana, y Concentradores Parabolicos Compuestos. La primera unidad de demostracion se planea que sea instalada en un edificio de oficinas en Curazao. La instalacion consiste en una maquina de absorcion de litio bromo/H{sub 2}O de 35 kW accionada por colectores de placa plana de 100 m{sup 2} con un sistema de respaldo de gas. El sistema proporcionara aire acondicionado para el confort para este tipo de edificio de oficinas durante las horas del dia.

    12. Thallium in the marine environment: first ecotoxicological assessments in the Guadalquivir estuary and its potential adverse effect on the donana european natural reserve after the Aznalcollar mining spill (SW Spain); Talio en el medio marino: primera valoracion ecotoxicologica en el estuario del Guadalquivir y su efecto potencial adverso en la reserva natural de donana despues del vertido minero de Aznalcollar (SW de Espana).

      Energy Technology Data Exchange (ETDEWEB)

      DelValls, T.A [Departamento de Quimica Fisica, Facultad de Ciencias del Mar, Universidad de Cadiz, Puerto Real, Cadiz (Spain); Saenz, V; Arias, A.M; Blasco, J [Instituto de Ciencias Marinas de Andalucia, CSIC, Puerto Real, Cadiz (Spain)

      1999-06-01

      Thallium (Tl) is an extremely toxic but little-studied element in the marine environment and practically no information has been reported on the levels of Tl in marine organisms. After the Aznalcollar mining Spill (April 1998), high levels of metals were put into the environment. This acud-contaminated medium was responsible for the initial pollution effects measured in the Guadiamar River, which is an affluent of the Guadalquivir River and very close to the biggest natural reserve in Europe (Donana). Four different species were used in the monitoring from April to September 1998 and a sediment field bioassay to check bioacumulation was performed. We present the first ecotoxicological evaluation of the mining spill in the Guadalquivir River, with reference to Tl, a little-known metal. Also, Pb and Cd data were compared to Tl during field sediment testing. Results show low levels of this metal in all of the organisms studied and they do not show any increase in the level of this metal, ranging from 40 to 90 ng g{sup -}1, 80 to 210 ng g{sup -}1, 15 to 98 ng g{sup -}1 and 75 to 125 whole body dry weight for Scrobicularia plana, Liza ramada (muscle), Crassostrea angulata and Uca Tangeri, respectively. These are the first field data of Tl concentration measured using estuarine organisms. Field sediment toxicity test results confirm those obtained during the monitoring: Tl is not bioaccumulated by the organisms (C. angulata) used in the test. The sequence in bioaccumulation of metals was Cd > Pb > Tl. Both studies, bioaccumulation and sediment toxicity, should be maintained during the next few years to really evaluate the potential effect of the mining spill on the ecosystem and society. [Spanish] El talio (Tl) es un elemento extremadamente toxico aunque poco estudiado en el medio marino y la informacion sobre niveles de Tl en organismos marinos con anterioridad al presente trabajo es practicamente nula. Despues del vertido minero de Aznalcollar (abril de 1998) se

    13. Optical and thermal design of 1.5-m aperture solar UV visible and IR observing telescope for Solar-C mission

      Science.gov (United States)

      Suematsu, Y.; Katsukawa, Y.; Shimizu, T.; Ichimoto, K.; Horiuchi, T.; Matsumoto, Y.; Takeyama, N.

      2017-11-01

      The next Japanese solar mission, SOLAR-C, which has been envisaged after successful science operation of Hinode (SOLAR-B) mission, is perusing two plans: plan-A and plan-B, and under extensive study from science objectives as well as engineering point of view. The plan-A aims at performing out-of-ecliptic observations for investigating, with helioseismic approach, internal structure and dynamo mechanisms of the Sun. It also explores polar regions where fast solar wind is believed to originate. A baseline orbit for plan-A is a circular orbit of 1 AU distance from the Sun with its inclination at around or greater than 40 degrees. The plan-B aims to study small-scale plasma processes and structures in the solar atmosphere which attract researchers' growing interest, followed by many Hinode discoveries [1], for understanding fully dynamism and magnetic nature of the atmosphere. With plan-B, high-angular-resolution investigation of the entire solar atmosphere (from the photosphere to the corona, including their interface layers, i.e., chromosphere and transition region) is to be performed with enhanced spectroscopic and spectro-polarimetric capability as compared with Hinode, together with enhanced sensitivity towards ultra-violet wavelengths. The orbit of plan-B is either a solar synchronous polar orbit of altitude around 600 km or a geosynchronous orbit to ensure continuous solar observations. After the decision of any one of the two plans, the SOLAR-C will be proposed for launch in mid-2010s. In this paper, we will present a basic design of one of major planned instrumental payload for the plan-B: the Solar Ultra-violet Visible and near IR observing Telescope (hereafter referred to as SUVIT). The basic concept in designing the SUVIT is to utilize as much as possible a heritage of successful telescope of the Solar Optical Telescope (SOT) aboard Hinode [2]. Major differences of SUVIT from SOT are the three times larger aperture of 1.5 m, which enables to collect one

    14. Plantas úteis para revestimento do solo: II - Gramíneas de porte médio e grande

      Directory of Open Access Journals (Sweden)

      F. M. Aires de Alencar

      1952-12-01

      Full Text Available Preliminary results have been obtained on the development of 11 types of grasses with average height varying from 0.70 to 1.15 m and from 11 other types with average height from 1.30 to 5.00 m. From plots with an area of 25 m², from the collection of useful plants of the Soil Conservation Department of the Instituto Agronômico de Campinas, one sample of the plants was taken for each plot the sampled area being of 0,50 and 1.00 m², for the grasses of medium and large size, respectively. The above-ground parts of the plants were cut at the heights of 80, 26, 8, 2 and 0 cm (ground level respectively and determinations were made of the weight and volume of each portion of the plants under investigation. The results obtained are presented in tables 1 to 3. The underground parts of the grasses were studied in the same areas where the aerial parts were cut. Blocks of soil were taken with depths of 2, 8, 26 and 80 cm. The underground portions of the plants in each block were separated by the dry method, using wire screen, their weight and volume being determined (table 1 to 3. The soil particles holding capacity of each species of grass was determined by adding to the weight of the above-ground part at the lowest cut (block Aa the weight of the underground portion found at the first block (block Ba, table 2 and 3. It has been observed that among the medium sized grasses the capim chorão (Eragrostis curvula Nees var. valida Stapf, capim de boi (Setaria poiretiana Kunth, capim Araguai (Paspalum fasdculatum Willd. and capim de planta (Panicum purpurascens Raddi and among the taller grasses the capim sempre-verde (Panicum maximum Jacq. var. gongylodes, capim elefante Merker, Napier and AxB (Pennisetum purpureum Schum. as well as capim vetiver (Vetiveria zizanioides Nash, seem to be more promissing for holding the soil particles and more useful for soil conservation purposes.

    15. Modeling the Climate and Hydrological Controls of the Expansion of an Invasive Grass Over Southern Arizona

      Science.gov (United States)

      Mathias, A.; Niu, G.; Zeng, X.

      2013-12-01

      Climate change has an effect on the resilience of ecosystems and the occurrence of ecological perturbations (e.g. spread of invasive species, wildfires). Changes in vegetation in turn can interrupt regional scale climate patterns and alter the spatial and temporal propagation of ecological disturbances. Understanding the controls of vegetation change are essential for predicting future changes, and for setting conservation and restoration targets. Vegetation change in transition zones between ecological regions is a significant indicator of future shifts in the composition of neighboring plant communities. The Walnut Gulch Experimental Watershed is in a grassland-shrubland transition zone between the Sonoran and Chihuahuan Desert in Southern Arizona. During the past decade, at some sites the cover of the invasive Lehmann lovegrass (Eragrostis lehmanniana) drastically increased and the abundance of native vegetation decreased, causing a major decline in biodiversity. Focusing on a catchment scale (Kendall Site), we used an individual based vegetation model (ECOTONE) and a coupled vegetation-3D surface/subsurface hydrology model (ECOTONE-CATHY) to simulate vegetation change. We set up the models with soil and climatological data (NLDAS and AmeriFlux), incorporated initial conditions of species and biomass distribution and species parameters for the site. Using ECOTONE we tested our hypothesis that a combination of dry years and subsequent wet period caused Lehmann lovegass to have advantage over the natives. In ECOTONE species composition and species distribution of plant communities arise from dynamic interactions of individual plants with species specific traits through intra- and interspecific competition for resources (H2O, nitrogen) and their interaction with the environment (precipitation and temperature). Our results indicate that the competitive advantage of Lehmann lovegrass stems from its ability to withstand dryer conditions during establishment and due to

    16. Influence of tropical leaf litter on nitrogen mineralization and community structure of ammonia-oxidizing bacteria

      Directory of Open Access Journals (Sweden)

      Diallo, MD.

      2015-01-01

      Full Text Available Description of the subject. The present study concerns the relationships among leaf litter decomposition, substrate quality, ammonia-oxidizing bacteria (AOB community composition and nitrogen (N availability. Decomposition of organic matter affects the biogeochemical cycling of carbon (C and N. Since the composition of the soil microbial community can alter the physiological capacity of the community, it is timely to study the litter quality effect on N dynamic in ecosystems. Objectives. The aim of this study was to determine the influence of leaf litter decomposition on N mineralization. The specific objectives of this study were to evaluate the influence of the litter biochemistry of five plants species (Faidherbia albida A.Chev., Azadirachta indica A.Juss., Casuarina equisetifolia L., Andropogon gayanus Kunth and Eragrostis tremula Hochst. ex Steud. on N mineralization in a tropical ferrous soil (Lixisol, nitrification, and genetic diversity of ammonia-oxidizing bacteria. Denaturing gradient gel electrophoresis (DGGE of amplified fragments of genes coding for 16S rRNA was used to study the development of bacterial communities during decomposition of leaf litter in soils. Method. Community structure of AOB was determined at two time periods: day 0 and day 140. Ten strains were tested and each of these strains produced a single band. Thus, DGGE DNA band patterns were used to estimate bacterial diversity. Plant secondary compounds such as polyphenols are purported to influence nutrient cycling by affecting organic matter degradation, mineralization rates, N availability and humus formation. In a laboratory study, we investigated the influence of six phenolic acids (ferulic, gallic, vanillic, syringic, p-coumaric and p-HBA acids commonly found in the plant residues on N mineralization and NH4+ and NO3- production in soils. Results. The results showed that litter type did affect soil nitrification. Faidherbia albida litter was associated with

    17. Clinical and cost-effectiveness of internal limiting membrane peeling for patients with idiopathic full thickness macular hole. Protocol for a Randomised Controlled Trial: FILMS (Full-thickness macular hole and Internal Limiting Membrane peeling Study

      Directory of Open Access Journals (Sweden)

      Cook Jonathan

      2008-11-01

      Full Text Available Abstract Background A full-thickness macular hole (FTMH is a common retinal condition associated with impaired vision. Randomised controlled trials (RCTs have demonstrated that surgery, by means of pars plana vitrectomy and post-operative intraocular tamponade with gas, is effective for stage 2, 3 and 4 FTMH. Internal limiting membrane (ILM peeling has been introduced as an additional surgical manoeuvre to increase the success of the surgery; i.e. increase rates of hole closure and visual improvement. However, little robust evidence exists supporting the superiority of ILM peeling compared with no-peeling techniques. The purpose of FILMS (Full-thickness macular hole and Internal Limiting Membrane peeling Study is to determine whether ILM peeling improves the visual function, the anatomical closure of FTMH, and the quality of life of patients affected by this disorder, and the cost-effectiveness of the surgery. Methods/Design Patients with stage 2–3 idiopathic FTMH of less or equal than 18 months duration (based on symptoms reported by the participant and with a visual acuity ≤ 20/40 in the study eye will be enrolled in this FILMS from eight sites across the UK and Ireland. Participants will be randomised to receive combined cataract surgery (phacoemulsification and intraocular lens implantation and pars plana vitrectomy with postoperative intraocular tamponade with gas, with or without ILM peeling. The primary outcome is distance visual acuity at 6 months. Secondary outcomes include distance visual acuity at 3 and 24 months, near visual acuity at 3, 6, and 24 months, contrast sensitivity at 6 months, reading speed at 6 months, anatomical closure of the macular hole at each time point (1, 3, 6, and 24 months, health related quality of life (HRQOL at six months, costs to the health service and the participant, incremental costs per quality adjusted life year (QALY and adverse events. Discussion FILMS will provide high quality evidence on the

    18. Clinical study of secondary glaucoma after silicone oil tamponade

      Directory of Open Access Journals (Sweden)

      Xiao-Chun Chen

      2013-12-01

      Full Text Available AIM: To evaluate the related risk factors and treatment method of secondary glaucoma after pars plana vitrectomy and silicone oil tamponade.METHODS: The retrospective study analyzed 114 patients(118 eyeswho were treated with pars plana vitrectomy combined with silicone oil tamponade. Lenses were reserved in 78 eyes and were taken away in 40 eyes among which intraocular lens were implanted in 17 eyes. There were 39 eyes in which the filling time of silicone was no more than 6 months while 79 eyes in which the filling time was more than 6 months. The follow-up time was(16.2±4.9months. Primary and secondary glaucoma were excluded before the vitrectomy. Silicone oil glaucoma(SOGwas diagnosed when intraocular pressure(IOPwas measured higher than 21mmHg(1mmHg=0.133kPathree times in succession at least 1 month after silicone oil tamponade and inflammation and neovascular glaucoma should be excluded. Anti-glaucoma drugs were administrated once SOG was diagnosed. If the IOP was not controlled after 2 weeks, the silicone oil was taken away. If the IOP was still high, the anti-glaucoma surgery was operated. The data was analyzed by the SPSS 16.0 software using a binary logistic regression analysis. RESULTS: Among the 32 eyes of SOG, lenses were removed in 16 eyes(50%. The filling time of silicone oil was more than 6 months in 27 eyes(84.4%and silicone oil emulsion happened in 20 eyes(62.5%. IOP returned normal in 17 eyes after administrating anti-glaucoma medication within 2 weeks. Silicone oils were taken away in 15 eyes. However, 4 eyes still had high IOP after surgery; one of them was given anti-glaucoma drugs once more; two of them underwent trabeculectomy and one of them underwent cyclophotocoagulation. The lens conditions(whether it was taken away or not, P=0.024, the silicone oil filling time(whether the time was more than 6 months, P=0.014, and the status of the silicone oil(whether emulsification occurred or not, P=0.000were all found to be

    19. Patient-reported outcomes in European spondyloarthritis patients: a systematic review of the literature

      Directory of Open Access Journals (Sweden)

      Torre-Alonso JC

      2018-05-01

      Full Text Available Juan Carlos Torre-Alonso,1 Rubén Queiro,2 Marta Comellas,3 Luís Lizán,3,4 Carles Blanch5 1Rheumatology Department, Faculty of Medicine and Health Sciences, University of Oviedo, Hospital Monte Naranco, Oviedo, Spain; 2Rheumatology Division, Hospital Universitario Central de Asturias (HUCA, Oviedo, Spain; 3Outcomes 10, Castellón de la Plana, Spain; 4Medicine Department, Jaime I University, Castellón de la Plana, Spain; 5Health Economics & Market Access, Novartis Pharmaceuticals, Barcelona, Spain Objective: This review aims to summarize the current literature on patient-reported outcomes (PROs in spondyloarthritis (SpA. Patients and methods: We performed a systematic literature review to identify studies (original articles and narrative and systematic reviews regarding PROs (health-related quality of life [HRQoL], satisfaction, preferences, adherence/compliance, and persistence in SpA patients published in the European Union through December 2016. International databases (Medline/PubMed, Cochrane Library, ISI Web of Knowledge, Scopus were searched using keywords in English. The methodological quality of the studies was assessed using the Oxford Centre for Evidence-Based Medicine criteria. Results: A total of 26 publications met the inclusion criteria. Generally, studies indicated that SpA has a negative impact on patients’ HRQoL. In patients with ankylosing spondylitis, physical domains were more affected than emotional ones, whereas for psoriatic arthritis, both physical and psychological factors were strongly affected by the disease. Data indicated that biological agents (BAs greatly contributed to improvement in HRQoL in both ankylosing spondylitis and psoriatic arthritis patients. Findings on compliance with BAs were heterogeneous. However, persistence rates exceeded 50% irrespective of the BA administered. Results on preferences indicated that most SpA patients prefer being involved in decisions regarding their treatment and that

    20. PC-3 Prostat Kanser Hücreleri Üzerinde İndosyanin Yeşili Kullanarak Yapılan Fotodinamik Terapinin AO/PI Boyama Testi Sonuçları

      Directory of Open Access Journals (Sweden)

      Mustafa Kemal RUHİ

      2017-06-01

      Full Text Available Fotodinamik terapi (FDT prostat kanseri tedavisinde henüz araştırma aşamasında olan sağaltıcı bir alternatiftir. FDT, ışığa duyarlı bir kimyasal maddenin (fotosensitizan ışık ile aktive edilmesi ve aktive olan kimyasalın kanserli bölgedeki hücre canlılığını baskılayıcı etkiye neden olması prensibine dayanmaktadır. Bu yeni tedavi yöntemi hem seçiciliği hem de yan etkilerinin azlığı nedeniyle alternatifler arasında ön plana çıkmaktadır. FDT’de kullanılan fotosensitizanın ışıksız ortamda sitotoksik olmaması ve vücuttan kolay atılabilmesi istenmektedir. Ayrıca herhangi bir fotosensitizanın yakın kızılaltı ışık ile aktive olması, bu dalgaboyunun deriye ve diğer dokulara daha fazla nüfuz etmesinden dolayı tercih sebebidir. Bu özelliklere sahip olan İndosiyanin Yeşili (ISY daha çok floresans özelliği ile ön plana çıkmış ve görüntüleme amaçlı olarak kullanılmıştır. Bu in vitro çalışmada ISY-FDT’nin farklı inkübasyon süreleri sonundaki etkisi AO/PI boyama yöntemi kullanarak ortaya konmuştur. Elde edilen sonuçlar ISY-FDT’nin hücre canlılığını baskıladığını göstermektedir.