Particulate Nitrogen
Mostrando 13-24 de 64 artigos, teses e dissertações.
-
13. Isotopic variation of carbon and nitrogen of periphyton, fine particulate organic matter and algae in a land-use gradient in the Guapi-Macacu drainage basin in Rio de Janeiro State, Brazil / Estoque e variação de isótopos estáveis de carbono e de nitrogênio em perifíton, material particulado e algas em gradiente de impacto antropogênico no sistema hidrográfico de Guapi-Macacu, RJ.
O presente trabalho teve o objetivo testar se a composição isotópica de carbono e nitrogênio (δ13C e δ15N) do perifíton, do material orgânico particulado e das algas filamentosas acompanha o gradiente de impacto antropogênico presente na Bacia Hidrográfica Guapi-Macacu, no estado do Rio de Janeiro. O gradiente de impacto nesta área é form
Publicado em: 2009
-
14. Estrutura organizacional do fitoplâncton nos sistemas lóticos e lênticos da bacia do Tietê-Jacaré (UGRHi-Tietê-Jacaré) em relação à qualidade da água e estado trófico
The aim of this work was to study the phytoplankton structure of lentic and lotic systems of Tietê/Jacaré basin located in São Paulo State and the relationship between the composition and dominance of phytoplankton organisms with the water quality and trophic state of the rivers and lakes of this basin. The Tietê/Jacare basin is composed by three main ri
Publicado em: 2009
-
15. COMPARTIMENTOS DA MATÉRIA ORGÂNICA DO SOLO COMO INDICADORES DO SEQÜESTRO DE CARBONO EM SISTEMA PLANTIO DIRETO DE LONGA DURAÇÃO
A redução no conteúdo de carbono (C) da camada superficial em direção as camadas mais profundas do solo indica a formação da estratificação no perfil devido à adição contínua de C pelos resíduos orgânicos resultando no enriquecendo a camada superficial do solo. O objetivo deste trabalho foi avaliar os seguintes assuntos: a) a relação de estr
Publicado em: 2009
-
16. Qualidade da água e distribuição espacial de foraminíferos bentônicos em estuários das Baías Norte e Sul da Ilha de Santa Catarina (Brasil)
Watersheds with different characteristics lead to different rates of biogeochemical elements that contribute in estuarine systems. Thus, this study investigated the contribution of drainage on the nutrients as well as the responses of benthic foraminifera, with focus on estuarine region of six major systems that discharge in the North and South bays of Santa
Publicado em: 2009
-
17. Secondary production of brnthonic macrofauna in the intertidal zone in the northern segment of Una beach, on the coast of the estate of São Paulo / Produção secundária da macrofauna bentônica da zona entremarés no segmento norte da praia do Una, litoral sul do estado de São Paulo
This study has as objective to estimate the secondary production and turnover rate (P/B) of the gastropod Hastula cinerea, the isopod Excirolana armata and the decapods Austinixa patogoniensis e Callichirus major in the intertidal zone of Una beach, situated in Estação Ecológica Juréia-Itatins, on the southern coast of the state of São Paulo. For that p
Publicado em: 2008
-
18. Caracterização hidrogeoquímica da microbacia de drenagem do córrego Barra Bonita, São Paulo / Hydrogeochemistry characterization of the Barra Bonita stream small watershed, São Paulo
The study in the Barra Bonita stream small watershed (S: 22o 2553,9" and W: 48o 3234,8") aimed to characterize its hydrogeochemical parameters by dissolved and particulate material transport models to identify the relations between soil use and water quality. Because there was no longer an environmental zoning in the municipality of Barra Bonita, this study
Publicado em: 2007
-
19. Carbon and nitrogen in the soil under different uses and managements and your modelling by the Century / Carbono e nitrogênio no solo sob diferentes usos e manejos e sua modelagem pelo Century
Every change in the use and management can induce alterations in the C and N stocks of the soil. In this sense, this study was carried out to verify those alterations in the different use and management systems, as well as the capacity of the Century model to simulating those alterations, by comparing the measured stocks with the simulated ones. In Paracatú
Publicado em: 2007
-
20. CARBON DYNAMICS ON A RHODIC HAPLUDOX ON SOIL TILLAGE AND CROP SYSTEMS / DINÂMICA DO CARBONO EM LATOSSOLO VERMELHO SOB SISTEMAS DE PREPARO DE SOLO E DE CULTURAS
The soil C stock is a consequence of the balance between the C losses by the CO2 emission (associate to the heterotrofic microorganisms activity) and erosion, and to C inputs, associate to organic compounds input by the vegetal photosynthesis process. In order to evaluate the soil tillage and crop systems regarding to the C inputs by the residues and the C l
Publicado em: 2006
-
21. Low birth weight and air pollution in the city of São Paulo / Baixo peso ao nascer e a poluição do ar no município de São Paulo
The birth weight is an important factor of the morbi-mortality neonatal determination and of the mortality neonatal, and then of big importance to public health, due frequency that it occurs. Therefore, the Health World Organization considers the low birth weight (LBW) the most important isolated factor in childhood survival. A lot of risk factors have been
Publicado em: 2004
-
22. Denitrification and Ammonia Formation in Anaerobic Coastal Sediments
Simultaneous determinations of nitrogen gas production, ammonia, and particulate organic nitrogen formation in the coastal sediments of Mangoku-Ura, Simoda Bay, and Tokyo Bay were made by using the 15N-label tracer method. The rate of nitrogen gas production in the sediment surface layer was about 10−2 μg atom of N per g per h, irrespective of the locatio
-
23. Solubilization and Separation of Uridine Diphospho-d-glucose: β-(1 → 4) Glucan and Uridine Diphospho-d-glucose:β-(1 → 3) Glucan Glucosyltransferases from Coleoptiles of Avena sativa1
The particulate glucan synthetase preparation isolated from a homogenate of oat coleoptiles at 4 C lost 65% of its original activity after 1 day when the UDP-d-glucose substrate concentration was 5 × 10−7m to 1.0 × 10−6m. Storage of the particulate enzyme at −20 C or in liquid nitrogen did not prevent the enzyme from losing its activity. Incorporatio
-
24. Decomposition of Blue-Green Algal (Cyanobacterial) Blooms in Lake Mendota, Wisconsin
Decomposition of natural populations of Lake Mendota phytoplankton dominated by blue-green algae (cyanobacteria) was monitored by using oxygen uptake and disappearance of chlorophyll, algal volume (fluorescence microscopy), particulate protein, particulate organic carbon, and photosynthetic ability (14CO2 up-take). In some experiments, decomposition of 14C-l