58 research outputs found
Tratamento de sementes e uso de micronutrientes na adubação de arroz irrigado.
bitstream/item/30415/1/boletim-69.pd
New stopping criteria for segmenting DNA sequences
We propose a solution on the stopping criterion in segmenting inhomogeneous
DNA sequences with complex statistical patterns. This new stopping criterion is
based on Bayesian Information Criterion (BIC) in the model selection framework.
When this stopping criterion is applied to a left telomere sequence of yeast
Saccharomyces cerevisiae and the complete genome sequence of bacterium
Escherichia coli, borders of biologically meaningful units were identified
(e.g. subtelomeric units, replication origin, and replication terminus), and a
more reasonable number of domains was obtained. We also introduce a measure
called segmentation strength which can be used to control the delineation of
large domains. The relationship between the average domain size and the
threshold of segmentation strength is determined for several genome sequences.Comment: 4 pages, 4 figures, Physical Review Letters, to appea
The novel chicken interleukin 26 protein is overexpressed in T cells and induces proinflammatory cytokines
Feeding of Triportheus angulatus (Spix & Agassiz, 1829) in the Camaleão lake, Manaus, Amazonas state, Brazil
Periodical flooding cause strong modifications in Central Amazonian floodplain. Periodical rising and decreasing of the water level influences abiotic and biotic factors of the aquatic environments. During the flooding season, there is a high feed availability, in contrast with dry season in which feed availability is at the lowest level. Limnological parameters also change seasonally. Oxygen concentrations vary both daily and seasonally, sometimes even showing hypoxic conditions. Despite these alterations, floodplain lakes are inhabited by several fish species, having the most diverse and abundant fish fauna among the Amazonian environments. This study focused on Triportheus angulatus feeding in temporal distribution in order to understand the influences of hydrological changes on individual size, diet composition and feeding even in low oxygen concentrations. In rising waters season, small individuals are predominant while the decreasing and the dry seasons there are mostly larger ones. There is a seasonal change on diet composition and this is related to feed type that is more available: during the rising, fishes eat mainly insects and zooplankton; in the flood season and drying season, seeds and fruits are predominant, and at the dry season they eat mainly insects. Feed ingestion was higher in the rising waters and mostly in the flood, and it was lower in the drying season. Feeding activity was not related with oxygen concentrations.As inundações periódicas na Amazônia Central causam profundas modificações no meio ambiente. A alternância dos períodos de cheias e secas tem influência nos fatores bióticos e abióticos do meio aquático. Na enchente e na cheia é alta a oferta de alimentos, ampliando o espectro alimentar que é restrito na seca. As variáveis limnológicas também sofrem modificações. As concentrações de oxigênio têm variações sazonais e diárias, às vezes com períodos de hipoxia. Apesar dessas alterações, os lagos de várzea são habitados por muitas espécies de peixes e estão entre os ambientes de maior abundância e riqueza de peixes na Amazônia. A distribuição temporal e a alimentação de Triportheus angulatus (Spix & Agassiz, 1829) foi estudada em um lago de várzea da Amazônia Central para entender a influência das modificações hídricas sobre o tamanho dos indivíduos, a composição da dieta e a ingestão dos alimentos mesmo em condições de baixas concentrações de oxigênio. Na enchente predominam os indivíduos menores, enquanto que na cheia, vazante e seca os maiores. Houve mudança sazonal na composição da dieta que foi relacionada com a disponibilidade de alimentos no ambientena enchente os peixes ingerem principalmente insetos e zooplâncton; na cheia e vazante frutos e sementes, e na seca insetos. O consumo de alimento foi alto na enchente e cheia, decrescendo na vazante e atingindo as menores quantidades na seca. A atividade alimentar, no período estudado, não foi influenciada pelas baixas concentrações de oxigênio existentes no lago
Enclosure experiments to test effects of log storage on a large salmonid producing lake: Water quality and zooplankton density
Growth and Survival of Larval and Postlarval Smallmouth Bass Fed a Commercially Prepared Dry Feed and/or Artemia Nauplii
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