Observation comparative du déplacement ionique dans les couches minces de PbF2 β et de CaF2 par diffusion Rutherford

Des couches minces de PbF2 β et de CaF2, dont les conductivités ioniques sont très différentes, ont été analysées par rétro-diffusion de particules α. On a pu observer, dans le cas de PbF2, une variation importante du rapport des concentrations fluor/plomb dans l'épaisseur de la couche, correspondant à une accumulation de fluor du côté du faisceau incident. Cet effet est atténué dans les couches de CaF2. L'interprétation des résultats est basée sur l'existence d'un nombre important de défauts créés par le faisceau, et sur leur déplacement sous l'effet de la charge superficielle due à l'émission secondaire d'électrons

O cultivo do tomate em Roraima.

bitstream/item/175139/1/0062002-tomate-joaci.pd

Importance of reliability in evaluating the quality of exams in health sciences

Importance of reliability in evaluating the quality of exams in health science

Use of the CONSIDER statement by eye health researchers when conducting and reporting research involving Indigenous peoples: an online survey

Background: Indigenous peoples experience worse eye health compared to non-Indigenous peoples. Service providers and researchers must avoid perpetuating this inequity. To help achieve this, researchers can use the CONSolIDated critERia for strengthening the reporting of health research involving Indigenous peoples (CONSIDER) statement. This study aimed to identify the degree to which the CONSIDER statement has been used by eye health researchers when conducting and reporting research with an Indigenous component, and how they perceive its relevance in their future research. Methods: We used purposive sampling to recruit eye health researchers from any country who have undertaken research with an Indigenous component. The online survey collected quantitative and qualitative data and was analysed using descriptive statistics and reflexive thematic analysis. Responses were gathered on a four-point Likert scale (1 to 4), with four being the most positive statement. Results: Thirty-nine eye health researchers from nine countries completed the survey (Aotearoa New Zealand, Argentina, Australia, Brazil, Canada, Colombia, Guatemala, Panama, Peru); almost two-thirds (n = 24) undertake epidemiological research. On average, participants disclosed only ‘sometimes’ previously reporting CONSIDER items (2.26 ± 1.14), but they thought the items were relevant to eye health research and were motivated to use these guidelines in their future research. Some participants requested clarity about how CONSIDER aligned with existing guidelines, and when and how to apply the statement. Others shared rich experiences of the benefits to their research of Indigenous leadership and collaboration. Conclusions: The CONSIDER statement is perceived as a valuable tool by these eye health researchers, and there are opportunities to maximise uptake and use, including increasing awareness of the statement, clarity about when it applies, and availability of institutional-level support

GLYCOSAMINOGLYCANS AND PROTEOGLYCANS IN PALMAR FASCIA OF PATIENTS WITH DUPUYTREN

Objective : To evaluate and compare the behavior of glycosaminoglycans (GAGs) in Dupuytren disease (DD). Methods : This is an experimental study with 23 patients diagnosed with DD. Tissue collected through fasciectomy with incision type Brunner or McCash were evaluated by electrophoresis for identification of GAGs. The quantification was carried out by immunofluorescence and dosage of proteins for different types of glycosaminoglycans. The results were expressed in percentage and statistically evaluated. Results : A significant increase was observed through eletrophoresis in GAGs, as compared to the control (p<0.05). Immunofluorescence of hyaluronic acid was reduced (23 times) when compared to the control (p<0.0001). Conclusion : An increase of sulfated GAGs in Dupuytren's disease, mainly dermatan sulfate, was evident from our results, as well as a pronounced decrease of hyaluronic acid in the palmar aponeurosis from the same patients. Level of Evidence III, Case-Control Study

DNA Fingerprinting Validates Seed Dispersal Curves from Observational Studies in the Neotropical Legume Parkia

Background: Determining the distances over which seeds are dispersed is a crucial component for examining spatial patterns of seed dispersal and their consequences for plant reproductive success and population structure. However, following the fate of individual seeds after removal from the source tree till deposition at a distant place is generally extremely difficult. Here we provide a comparison of observationally and genetically determined seed dispersal distances and dispersal curves in a Neotropical animal-plant system. Methodology/Principal Findings: In a field study on the dispersal of seeds of three Parkia (Fabaceae) species by two Neotropical primate species, Saguinus fuscicollis and Saguinus mystax, in Peruvian Amazonia, we observationally determined dispersal distances. These dispersal distances were then validated through DNA fingerprinting, by matching DNA from the maternally derived seed coat to DNA from potential source trees. We found that dispersal distances are strongly rightskewed, and that distributions obtained through observational and genetic methods and fitted distributions do not differ significantly from each other. Conclusions/Significance: Our study showed that seed dispersal distances can be reliably estimated through observational methods when a strict criterion for inclusion of seeds is observed. Furthermore, dispersal distances produced by the two primate species indicated that these primates fulfil one of the criteria for efficient seed dispersers. Finally, our stud

Interfaces rodoviário-urbanas no processo de produção das cidades: estudo de caso do contorno rodoviário de João Pessoa, PB, Brasil

As rodovias desempenham fun&#231;&#227;o importante no processo de estrutura&#231;&#227;o das cidades, por facilitar os deslocamentos interurbanos. No entanto, quando absorvidas pela malha urbana de uma cidade, essas rodovias desenvolvem din&#226;micas particulares com o espa&#231;o intraurbano no qual est&#227;o inseridas, com altera&#231;&#245;es na acessibilidade, na morfologia e no uso e ocupa&#231;&#227;o da terra urbana. Com base nesse contexto, este artigo tem por objetivo analisar as din&#226;micas entre a implanta&#231;&#227;o do contorno rodovi&#225;rio da BR-230 e o processo de produ&#231;&#227;o do espa&#231;o intraurbano da cidade de Jo&#227;o Pessoa-PB, entre os anos de 1963 e 2013, em termos de morfologia, uso e ocupa&#231;&#227;o do solo urbano. O m&#233;todo empregado foi o da L&#243;gica Evolutiva do Tecido Urbano, que divide a evolu&#231;&#227;o urbana em tr&#234;s est&#225;gios: supera&#231;&#227;o de limites, crescimento e combina&#231;&#227;o/conflitos. O m&#233;todo foi associado a ferramentas anal&#237;ticas, como a Sintaxe Espacial e softwares de Sistema de Informa&#231;&#227;o Geogr&#225;fica. Os resultados mostram que a rodovia impulsionou o espraiamento da cidade para o setor sul e produziu uma malha urbana tentacular, onde tamb&#233;m se identificou o padr&#227;o de crescimento horizontal e fragmentado, altera&#231;&#245;es na acessibilidade, uso do solo e na segrega&#231;&#227;o socioespacial