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Institution

Universidade Federal de Viçosa

EducationViçosa, Brazil
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.


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Journal ArticleDOI
TL;DR: In this paper, the fatty acid composition of common carp (Cyprinus carpio), Nile tilapia (Oreochromis niloticus) and tambacu, a hybrid of tambaqui (Colossoma macropomum) and pacu (Piaractus mesopotamicus), was evaluated by gas chromatography.

77 citations

Journal ArticleDOI
TL;DR: Chlorantraniliprole seemed to be the least dangerous insecticide for these three beneficial arthropod test species, while chlorpyrifos and acephate were the most toxic.

77 citations

Journal ArticleDOI
TL;DR: In all species there was an increase of N content and reduction of the content of dry matter of the forage, which became juicier in the shade, and the morphological characteristics did not show a standard behavior, which varied according to the studied specie.
Abstract: O objetivo deste trabalho foi avaliar a influencia de tres niveis de sombreamento artificial (0,30 e 60%) sobre a producao de materia seca, a concentracao de nitrogenio e as caracteristicas morfologicas de seis especies de gramineas forrageiras tropicais (Andropogon gayanus, cv. Planaltina, Brachiaria brizantha, cv. Marandu, B. decumbens, Melinis minutiflora, Panicum maximum, cv. Vencedor, e Setaria anceps, cv. Kazungula). Foi usado delineamento em blocos ao acaso, com parcelas subdivididas e quatro repeticoes; nas parcelas foram distribuidos os niveis de sombreamento e nas subparcelas, as especies forrageiras. Os resultados demonstram que o sombreamento influenciou a producao de materia seca, a concentracao de N e as caracteristicas morfologicas das especies avaliadas. A producao forrageira foi influenciada diferencialmente pelo sombreamento. A producao de materia seca do P. maximum, cv. Vencedor foi 19,72% maior a sombra moderada que a pleno sol. A producao de S. anceps, cv. Kazungula, entretanto, nao foi influenciada pelo sombreamento. As demais especies tiveram decrescimo da producao de materia seca com a reducao da luminosidade. Em todas as especies, houve aumento da concentracao de N e reducao do teor de materia seca da forragem, que se tornou mais suculenta a sombra. As caracteristicas morfologicas nao apresentaram comportamento padrao, variando conforme a especie avaliada.

77 citations

Journal ArticleDOI
TL;DR: The effects of forest fragmentation on tree-hole nesting solitary wasps and bees were investigated and it appears that at least in part, the natural variation in continuous forest could be responsible for the resulte obtained from this study.
Abstract: The effects of forest fragmentation on tree-hole nesting solitary wasps and bees were investigated at a site 90 km north of Manaus, Brazil. Wasp and bee faunas were monitored in continuous terra firme forest, forest fragments of 1, 10 and 100 ha, natural gaps in continuous forest and deforested areas. These habitats were studied in terms of abundance, richness, diversity and similarity. The wasps and bees were monitored monthly during June 1988 through June 1990 by means of a trap-nests technique. A total of 1529 nests of wasps of 24 species and 405 nests of bees of 14 species were collected. The number of species of wasps and bees varied little among the habitats. The genus Trypoxylon Latreille, 1796 (Sphecidae) accounted for 79% of wasp nests and Centris Fabricius, 1804 (Anthophoridae) for 56% of bee nests. Wasps showed an overall preference for cleared areas and fragments of 1 ha, whereas bees showed an overall preference for continuous forest and natural gaps. Nevertheless, some species of wasps showed a preference for nesting in continuous forest and some bees a preference for deforested areas. Species found in deforested areas also nested in small size forest fragments. This shows that species occurring predominantly in cleared areas can also colonize small forest fragments. The diversity of wasps and bees was greater in continuous forest. The composition of wasp and bee faunas of continuous forest was different from that of altered habitats. The similarity between the natural gaps and cleared areas was the smallest. The data suggest that the forest adapted bees are more sensitive to habitai fragmentation than the corresponding species of wasps. It is concluded that the preexisting cavity nesting solitary wasp and bee communities were altered by the forest fragmentation. However, it appears that at least in part, the natural variation in continuous forest could be responsible for the resulte obtained from this study.

77 citations

Journal ArticleDOI
TL;DR: The monocomponent adsorption of Cu2+, Co2+ and Ni2+ onto STA adsorbent in a fixed-bed column was investigated and optimized using a 22 central composite design, showing that STA is a promising candidate for real applications on a large scale.

77 citations


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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202346
2022320
20212,074
20202,208
20191,941
20181,865