Institution
Universidade Federal Rural do Rio de Janeiro
Education•Seropédica, Brazil•
About: Universidade Federal Rural do Rio de Janeiro is a education organization based out in Seropédica, Brazil. It is known for research contribution in the topics: Population & Species richness. The organization has 6405 authors who have published 9852 publications receiving 105911 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, a taxonomy of perfis de solos is presented, with a focus on atributos morfologicos, fisicos, quimicos e ambiente de ocorrencia.
Abstract: Uma importante propriedade dos Organossolos, e de outros solos com alto teor de C orgânico para predizer o potencial de uso e riscos de degradacao, e o grau de subsidencia (perda de massa e volume). Nos Organossolos ocorrem diferentes riscos de subsidencia, resultantes de seus atributos, em especial da natureza da materia orgânica e do ambiente de deposicao. Este estudo foi realizado com dados de 19 perfis de solos de diferentes regioes do Brasil. Foram adotados os procedimentos da SBCS para descricao e coleta dos perfis, e os metodos analiticos da Embrapa Solos para caracterizacao dos solos. A analise dos componentes principais foi utilizada para agrupar os perfis com o auxilio de atributos morfologicos, fisicos, quimicos e do ambiente de ocorrencia e mostrou-se adequada no agrupamento dos solos estudados com base em seus atributos, comparando-se com a sua taxonomia. Neste artigo foram usados os metodos multicriterio ordinais de Borda, Condorcet e Copeland para ordenar, segundo o risco de subsidencia, os perfis de Organossolos estudados. Os resultados mostram correlacao entre os metodos (exceto Condorcet, que nao foi capaz de ordenar as alternativas) e o residuo minimo, parâmetro usual para avaliar subsidencia. Isso indica eficacia para ordenar/classificar os perfis de solos estudados quanto ao risco de subsidencia. Os metodos quantitativos utilizados neste trabalho mostraram-se promissores como ferramentas em estudos na Ciencia do Solo.
47 citations
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TL;DR: Ten new compounds belonging to the same chemical class were synthesized and have been investigated in relation to their leishmanicidal activity, showing that the most effective compound is 1,7-bis-(4-propargyl-3-methoxyphenyl)-1,6-heptadiene-3,5-dione, which is about ten times more efficient than the original curcumin.
Abstract: In a previous work, the in vitro and in vivo activity of a series of diarylheptanoid derivatives against Leishmania amazonensis has been described. Based on the promising results, ten new compounds belonging to the same chemical class were synthesized and have been investigated in relation to their leishmanicidal activity. The compounds were obtained through several chemical modifications on the basic structure of curcumin (1,7-bis-(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione) in an attempt to increase its effectiveness and decrease the potential toxic effects. The drugs were assayed in vitro against L. amazonensis promastigotes and using pentamidine isethionate as reference drug. The results showed that the most effective compound is 1,7-bis-(4-propargyl-3-methoxyphenyl)-1,6-heptadiene-3,5-dione, which is about ten times more efficient than the original curcumin. Nevertheless, these results did not allow us to make any correlation between the leishmanicidal activity and the chemical structure of the compounds.
47 citations
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TL;DR: The minimally managed and more stabilized systems in tropical climates form HA of structural and compositional similarity, regardless of the nature of C (C3 or C4), in contrast, soils subjected to agricultural uses that promote higher or lower C inputs, form HA that are structurally different from P and F.
47 citations
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TL;DR: The distance decay approach is proposed as a rigorous and quantitative method to measure rates of community change as a function of host age, and for comparisons across host species to elucidate the role of host ecology in the development of parasite assemblages.
47 citations
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TL;DR: Amblyomma dubitatum engorged females, naturally infected by Rickettsia bellii, were used to establish a laboratory colony and showed to be only partially susceptible to R. rickettsii infection, since in all cases, only part of the ticks became infected by this agent, after being exposed to rickettsemic animals.
46 citations
Authors
Showing all 6461 results
Name | H-index | Papers | Citations |
---|---|---|---|
Johan Six | 107 | 447 | 49016 |
Sandra Amato | 100 | 1206 | 50094 |
Robert Poulin | 94 | 653 | 34633 |
C. Potterat | 90 | 751 | 37732 |
O.J. Ginther | 87 | 517 | 27914 |
David Murphy | 81 | 549 | 40441 |
Benedetta Mennucci | 75 | 349 | 48307 |
D. Galli | 68 | 541 | 19570 |
Erica Polycarpo | 51 | 286 | 13615 |
J. Peter W. Young | 51 | 117 | 9839 |
Miriam Dupas Hubinger | 47 | 203 | 8227 |
Albert Bursche | 47 | 213 | 9595 |
M. Gandelman | 46 | 128 | 11022 |
Jose Lopes | 42 | 139 | 9214 |
Murilo Rangel | 38 | 80 | 6038 |