Federal University of Roraima

About: Federal University of Roraima is a based out in . It is known for research contribution in the topics: Population & Thermogravimetry. The organization has 981 authors who have published 1218 publications receiving 7849 citations. The organization is also known as: Federal University of Roraima.

Validity of cervicovaginal cytology in a Brazilian State with high incidence rate of cervical cancer

Abstract: PURPOSE: To evaluate the validity of cervicovaginal cytology performed at LAPER, the main Laboratory of Pathology of the State of Roraima, Brazil, by interrater agreement (external monitoring) and agreement with histopathologic results.METHODS: One hundred women were included, a population-based convenience sample. Their cervical cytological exams were evaluated by the laboratory staff and reviewed by expert medical pathologists, external to the laboratory. Cohen's Kappa index, sensitivity and specificity were evaluated. The study was approved by LAPER coordination and Federal University of Roraima Research Ethics Commitee.RESULTS: Regarding the prevalence of human papillomavirus-related atypical, there was no concordance between the results issued by LAPER and by the external pathologists (k=0.21). A low sensitivity (28.5%) and specificity (89,2%) was detected for the diagnostic performance of LAPER, with a high proportion of false positive and false negative results. The cytological reports of the external pathologists showed higher sensitivity and specificity (71.4 and 98.9%, respectively), ruling out the possibility that errors related to collection methods and staining would explain the low performance of the laboratory.CONCLUSION: A low diagnostic accuracy of cervicovaginal cytology can be a barrier against the control of cervical cancer in Roraima. We emphasize the need for professional training and internal and external monitoring in Brazilian states with a high incidence of cervical cancer.

Procurando um arroz c4 mediante exame anatômico foliar

Abstract: A possibilidade de se encontrar genotipos de arroz, graminea C3, com caracteristicas anatomico-foliares semelhantes as gramineas C4 levou ao presente estudo. Genotipos com caracteristicas C4 seriam superiores fotossinteticamente, mais adaptados ao estresse ambiental e mais produtivos. Nesta pesquisa foi observada a anatomia foliar de 483 exemplares de arroz, sendo 477 da especie Oryza sativa L. e seis de outras especies (Oryza glumaepatula, O. glaberrima, O. nivara, O. rufipogon, O. flotante e O. longistaminata). Na pesquisa, observou-se a presenca de cloroplastos nas celulas da bainha vascular da cultivar CNA 6189. Em alguns outros genotipos, foram encontrados apenas vestigios de cloroplastos, e nenhum cloroplasto na maioria dos genotipos, como o IAC 25. Com base nos resultados encontrados, espera-se que por meio de tecnicas de biologia molecular, caracteristicas de plantas C4 venham a ser incorporadas a plantas, como o arroz, melhorando substancialmente as suas potencialidades de adaptacao a ambientes menos favorecidos.

O gênero Aeschynomene (Leguminosae-Papilionoideae) no estado de Roraima, Brasil

Abstract: Resumo Aeschynomene L., como atualmente delimitado, e um genero pantropical de leguminosas com cerca de 180 especies, pertencente a subfamilia Papilionoideae. Este trabalho apresenta o levantamento dos taxons de Aeschynomene no estado de Roraima, Regiao Norte do Brasil. Em Roraima, o genero esta representado por 11 especies: A. americana, A. brasiliana, A. evenia, A. filosa, A. fluminensis, A. histrix, A. interrupta, A. paniculata, A. pratensis, A. rudis e A. sensitiva. As especies A. rudis e A. evenia sao novas ocorrencias para a flora do estado. Neste trabalho sao fornecidas chaves de identificacao, descricoes, ilustracoes e informacoes sobre habitats preferenciais para as especies ocorrentes no estado.