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| Registros recuperados: 473 | |
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| PARRON, L. M.; BUSTAMANTE, M. M. da C.; PRADO, C. L. C.. |
| RESUMO: A disponibilidade de nitrogênio (N) inorgânico para as plantas, geralmente, depende da taxa de mineralização da matéria orgânica. A biomassa microbiana, além de indicadora da qualidade do solo, está relacionada à disponibilização de nutrientes. Este trabalho objetivou determinar as taxas de mineralização líquida de N e o carbono da biomassa microbiana (CBM) em solos, em um gradiente topográfico de Mata de Galeria no Distrito Federal, por 12 meses. O gradiente comporta três comunidades florísticas: úmida (margem do córrego), intermediária e seca (borda da mata), nas quais a produção líquida de N inorgânico foi 81,5; 29,2 e 25,3 kg N ha (elevado a -1) ano (elevado a -1), respectivamente. A quantidade de N-NO3- disponível na comunidade úmida foi 0,69... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Microbial flora.; Biomassa; Cerrado; Nitrogênio; Nitrificação; Mineralização; Microbiologia do Solo; População Microbiana; Umidade do Solo.; Solo; Biomass; Mineralization; Nitrification; Nitrogen; Soil water content.; Soil biology; Soil. |
| Ano: 2003 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568114 |
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| VAZ JUNIOR, S.. |
| A necessidade de desenvolvimento de novas matérias-primas renováveis para a química, em substituição ao petróleo, tem se mostrado como um desafioo estratégico para o século XXI. Neste contexto, o uso dos diferentes tipos de biomassa vegetal - amilácea, lignocelulósica, oleaginosa e sacarídea - pode se consolidar tanto como uma alternativa de uso de matérias-primas mais baratas e menos poluentes, bem como um modelo de agregação de valor econômico às cadeias agroindustriais, como as da soja, cana-de-açúcar, milho, florestas, entre outras. Tais linhas de ação poderão, sobretudo, contribuir para a sustentabilidade dos processos de produção de diferentes tipos de produtos químicos orgânicos, desde detergentes a fármacos, os quais são de largo uso na atualidade.... |
| Tipo: Livro técnico (INFOTECA-E) |
Palavras-chave: Química verde; Agroindústria; Biomassa; Biomass; Green chemistry. |
| Ano: 2013 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/967574 |
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| Rocha, Gra; Rossi-wongtschowski, Cldb; Pires-vanin, Ams; Jarre-teichmann, A. |
| Planktonic and benthic productivity and consumption were estimated to assess the availability of food to higher trophic-level consumers in the Ubatuba ecosystem on the SE coast of Brazil. The study area included waters from 10 to 100 m deep and covered 3800 km(2). The trophic compartments of the system were established on ecologically or taxonomically related species, considering their relative abundance and similarity of diets and habits. The compartments are phytoplankton, zooplankton, salps, bacterioplankton, cnidaria, polyplacophora, mollusca, carnivorous benthos, detritivorous polychaetes, other detritivorous benthos, penaeidea-caridea, brachyura, and echinodermata. Biomass, production, and consumption were estimated in summer and winter. Plankton... |
| Tipo: Text |
Palavras-chave: Biomasse; Production; Consommation; Subtropical; Atlantique Ouest; Biomass; Production; Consumption; Subtropical; Western Atlantic. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00321/43241/42970.pdf |
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| Maestrini, S; Rochet, M; Legendre, L; Demers, S. |
| Nutrient analyses were done in melted ice, frazil and sea water of the upper part of the water column, where as major constitutive elements of micro-algae were analysed. Measurements of nutrient uptake were carried out with frazil algae incubated at -1.5 degree C in a field incubator. Differential-enrichment bioassays and mean N/P ratio (5.9) demonstrated that actual growth of the cultures was nutrient-limited. Nitrogen governed the algal yield when illumination and grazing allowed the microalgae to grow. It concluded that the epontic dynamics is not only controlled from above, by the seasonal (climatic) changes in light intensity as generally assumed, but also from below, by the short-term (hydrodynamic) events of vertical mixing that replenish the... |
| Tipo: Text |
Palavras-chave: Nutritive value; Growth; Food absorption; Algae; Ice water interface; Biomass; Nutrients (mineral). |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-1533.pdf |
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| Baleux, B.; Caumette, P.; Trousselier, M.. |
| Numeration, biomass, distribution within time, some physiological characters and a taxonomical outline, with a standardized micro method, of aerobic hétérotrophie bacteria isolated from sediments an waters, from fishponds of "Domaine de Certes" (Arcachon) from june 1977 to may 1978 are described. Number of hétérotrophie bacteria evolved in a significant way, according to seasons, and bacterial biomass is higher in the sediments than in the waters. Metabolic or physiological differences (proteolysis, denitrification) appeared among populations due to the origin of sediments. Moreover the qualitative study pointed out taxonomical units as Bacillus associated to seasons, or Agrobacterium associated to vegetable detritical sediments. |
| Tipo: Text |
Palavras-chave: Lagunes; Bactéries hétérotrophes aerobies; Biomasse; Taxonomie; Micro méthode; Enzymatiques; Lagoons; Aerobic heterotrophic bacteria; Biomass; Taxonomy; Enzymatic micro methods. |
| Ano: 1979 |
URL: http://archimer.ifremer.fr/doc/00306/41677/40886.pdf |
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| Mazurie, Joseph; Bouget, Jean-francois. |
| in order to estimate the carrying capacity of Mont Saint-Michel Bay, the stock (or biomass) of cupped oysters, Crassostrea gigas, cultivated intertidally, in Cancale Bay, has been estimated in october 2002. Aerial photographs, at 2 scales (1/10 000 and 1/2000), provided by the mollusc farmers union, have been used to estimate the cumulative length of surelevaged trestles (« tables ») and the occupation rate by oyster bags. A field survey, between the 7th and 9th of october 2002, has been conducted by Ifremer with the help of « Lycée Maritime de Saint-Malo », on 40 sampled stations : 3 subsample bags per station were examined (counts and weights of different age-class oysters). 309 ha out of 333 leased ha were considered exploited (after elimination of... |
| Tipo: Text |
Palavras-chave: Baie du Mont Saint Michel; Cancale; Crassostrea gigas; Cupped oysters; Production; Biomass; Baie du Mont Saint Michel; Cancale; Crassostrea gigas; Huîtres creuses; Production; Biomasse; Stock. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/rapport-5296.pdf |
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| Agostini, Sylvain; Houlbrèque, Fanny; Biscéré, Tom; Harvey, Ben P.; Heitzman, Joshua M.; Takimoto, Risa; Yamazaki, Wataru; Milazzo, Marco; Rodolfo-metalpa, Riccardo. |
| Coral communities around the world are projected to be negatively affected by ocean acidification. Not all coral species will respond in the same manner to rising CO2 levels. Evidence from naturally acidified areas such as CO2 seeps have shown that although a few species are resistant to elevated CO2, most lack sufficient resistance resulting in their decline. This has led to the simple grouping of coral species into “winners” and “losers,” but the physiological traits supporting this ecological assessment are yet to be fully understood. Here using CO2 seeps, in two biogeographically distinct regions, we investigated whether physiological traits related to energy production [mitochondrial electron transport systems (ETSAs) activities] and biomass (protein... |
| Tipo: Text |
Palavras-chave: Ocean acidification; Hermatypic corals; Mitochondrial electron transport activity; Biomass; Resistance. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00677/78925/81293.pdf |
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| Cabecadas, L. |
| Biomass and phytoplankton photosynthetic response were studied in the lower Tagus estuary weekly, and related to environmental conditions in February, March and April 1994. The Photosynthesis-Irradiance ((P-I)-I-B) relation was studied based on the light-saturated photosynthesis rate (P(B)m) and the light-limited initial slope (a(B)). The nutrient concentrations observed were high enough to be considered as not limiting phytoplankton growth. Tagus estuary phytoplankton seems, to a certain extent, adapted to high turbid conditions, being able to utilize the low light levels more efficiently, which was translated by high values of a(B) [0.10-0.20 mg C (mg Chl a)(-1) h(-1) (W m(-2))(-1)]; however, light seems to limit phytoplankton production in the water... |
| Tipo: Text |
Palavras-chave: Production primaire; Phytoplancton; Estuaire; Biomasse; Turbidité; Primary production; Phytoplankton; Estuary; Biomass; Turbidity. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43621/43310.pdf |
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| Sarrazin, Jozee; Walter, Cecile; Sarradin, Pierre-marie; Brind'Amour, Anik; Desbruyeres, Daniel; Briand, Patrick; Fabri, Marie-claire; Van Gaever, S; Vanreusel, A; Bachraty, Charleyne; Thiebaut, E. |
| The composition, biomass and diversity of the fauna in a Bathymodiolus thermophilus mussel assemblage colonizing diffuse flow areas on the SEPR is described and compared with biological characteristics of other hydrothermal assemblages. The spatio-temporal dynamics of temperatures over fine scales within the mussel habitat are characterized using newly-developed statistical approaches. Temperature data obtained from two adjacent habitats (a cirriped assemblage and a bare substratum) are compared. The results of the temperature data show that the mean temperature and the temperature variations were significantly higher in the mussel assemblage (mean temperature: 4.12 +/- 1.85 degrees C) in comparison with 2.40 +/- 0.14 degrees C in the cirriped assemblage... |
| Tipo: Text |
Palavras-chave: East Pacific Rise; Temperature dynamics; Biomass; Diversity; Bathymodiolus thermophilus; Mussel assemblage; Hydrothermal vents. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-3570.pdf |
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| Caill-milly, Nathalie; Duclercq, Benoit; Morandeau, Gilles. |
| Between 1980 and 1986, some Arcachon oyster farmers took up breeding the Japanese clam on the foreshore (Robert et Deltreil, 1990). This production was short lived. The steep fall in prices due to economic competition from Spain, Portugal, Italy and Tunisia, predator action such as the trigger fish (Popovsky et al., 1999), added to the significant amount of mortality that occurred in the summer and autumn of 1992 that affected two-thirds of the total stock, led to clam farming being abandoned at the end of the 1980s. In the Arcachon basin, the Japanese clam (Ruditapes philippinarum) population, now natural to the area, has found favourable conditions for development and is expanding rapidly there. This species has been supplanting the local species... |
| Tipo: Text |
Palavras-chave: Ruditapes philippinarum; Veneridae; Popluation structure; Biomass; Stock assessment; Arcachon Bassin; Veneridae; Ruditapes Philippinarum; Bivalvia; Mollusca; Structure Population; Biomasse; Abondance; Evaluation Stock. |
| Ano: 2006 |
URL: https://archimer.ifremer.fr/doc/2006/rapport-2218.pdf |
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| Meyerreil, L; Graf, G. |
| The seasonal development of benthic communities was followed in a coastal marine sediment of the Kiel Bight (Baltic Sea; FRG). Total benthic biomass, (ATP), bacterial biomass, overall benthic activity (heat production), and enzymatic decomposition rates of carbohydrate (d-amylase activity) followed a seasonal cycle strongly related to certain events in the sediment. Among these, the input of the phytoplankton blooms in autumn and spring, the accumulation of organic material during winter, and changes in the physical characteristics of the sediment turned out to be most important for the development of benthic biomass and activity. Processes within the benthic community occurred in very short time scales (within days). |
| Tipo: Text |
Palavras-chave: Bacteria; Organic matter; Sediments; Bioenergetics; Enzymatic activity; Biomass. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-944.pdf |
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| Registros recuperados: 473 | |
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