Universidade Federal de Viçosa

About: Universidade Federal de Viçosa is a education organization based out in Viçosa, Brazil. It is known for research contribution in the topics: Population & Dry matter. The organization has 16012 authors who have published 26711 publications receiving 353416 citations.

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

Abstract: 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.

Contribuição dos domínios físico, social, psicológico e ambiental para a qualidade de vida global de idosos

Abstract: Este estudo investigou a contribuicao de cada dominio da qualidade de vida (fisico, social, psicologico e ambiental) na qualidade de vida global e em que extensao esses dominios explicam a qualidade de vida global de idosos residentes no municipio de Teixeiras, na Regiao Sudeste do Brasil. Trata-se de um estudo observacional de corte transversal, sendo a amostragem aleatoria estratificada por sexo, uso do Programa Saude da Familia e microarea de saude (n = 211, individuos com idade igual ou superior a 60 anos), representando 14,28% do total de idosos do municipio em estudo. O instrumento utilizado foi o Word Health Organization Quality of Life Instrument Bref (WHOQOL-Bref), proposto pela Organizacao Mundial de Saude, aplicado por um unico entrevistador, devidamente treinado. As analises de regressao linear mostraram que nenhuma das variaveis sociodemograficas interferiu significativamente no dominio global da qualidade de vida, e, entre os quatro dominios, o que mais explicou a qualidade de vida global foi o fisico, seguido do ambiental e do psicologico. O dominio social nao mostrou contribuicao significativa na qualidade de vida global. As possiveis explicacoes para os resultados encontrados foram discutidas.

Dependence of hydropower energy generation on forests in the Amazon Basin at local and regional scales.

Abstract: Tropical rainforest regions have large hydropower generation potential that figures prominently in many nations’ energy growth strategies. Feasibility studies of hydropower plants typically ignore the effect of future deforestation or assume that deforestation will have a positive effect on river discharge and energy generation resulting from declines in evapotranspiration (ET) associated with forest conversion. Forest loss can also reduce river discharge, however, by inhibiting rainfall. We used land use, hydrological, and climate models to examine the local “direct” effects (through changes in ET within the watershed) and the potential regional “indirect” effects (through changes in rainfall) of deforestation on river discharge and energy generation potential for the Belo Monte energy complex, one of the world’s largest hydropower plants that is currently under construction on the Xingu River in the eastern Amazon. In the absence of indirect effects of deforestation, simulated deforestation of 20% and 40% within the Xingu River basin increased discharge by 4–8% and 10–12%, with similar increases in energy generation. When indirect effects were considered, deforestation of the Amazon region inhibited rainfall within the Xingu Basin, counterbalancing declines in ET and decreasing discharge by 6–36%. Under business-as-usual projections of forest loss for 2050 (40%), simulated power generation declined to only 25% of maximum plant output and 60% of the industry’s own projections. Like other energy sources, hydropower plants present large social and environmental costs. Their reliability as energy sources, however, must take into account their dependence on forests.