Content And Nature Of Carbon
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Study of Crystallization and Composition on Silicon Oxycarbide (SiOC) and Silicon Boron Oxycarbide (SiBOC) Ceramics Obtained from Alkoxysilanes Precursors
This work deals on the preparation of silicon oxycarbide (SiOC) and silicon boron oxycarbide (SiBOC) ceramics from pyrolysis involving alkoxysilanes with different organic groups. Boron content, organic substituent and annealing time were evaluated on crystallization and composition of resulting ceramics. B-free precursors composed of methyltriethoxysilane (
J. Braz. Chem. Soc.. Publicado em: 2021-06
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2. Pentoses Used in Cultures of Synechococcus nidulans and Spirulina paracas: Evaluation of Effects in Growth and in Content of Proteins and Carbohydrates
Abstract The biological assimilation of the sugars present in lignocellulosic residues has gained prominence since these residues are the most abundant and economic residues in nature. Thus, the objective of this work was to determine whether the use of D-xylose and L-arabinose as sources of carbon in Synechococcus nidulans and Spirulina paracas cultures af
Braz. arch. biol. technol.. Publicado em: 25/11/2019
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3. Management Systems Effect on Fertility Indicators of a Ferralsol with Vegetable Crops, as Determined by Different Statistical Tools
ABSTRACT The intensive nature of soil use in vegetable production areas has led to a marked decrease in soil quality. The objective of this study was to evaluate the effects of adoption of soil management systems on vegetable production with regards to the chemical properties of a Rhodic Ferralsol after five years and to evaluate the use of the Principal Com
Rev. Bras. Ciênc. Solo. Publicado em: 24/08/2017
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4. Carbon and Nitrogen Stocks and Humic Fractions in Brazilian Organosols
ABSTRACT Despite limited geographic expression of Organosols in Brazil, their high carbon storage capacity and natural environmental vulnerability justifies further studies on C and N stocks in these soils and their relationship to the nature of organic matter. Evaluation of physical and chemical properties of organic soils and their ability to store C is im
Rev. Bras. Ciênc. Solo. Publicado em: 03/11/2016
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5. Occurrence of culturable soil fungi in a tropical moist deciduous forest Similipal Biosphere Reserve, Odisha, India
Similipal Biosphere Reserve (SBR) is a tropical moist deciduous forest dominated by the species Shorea robusta. To the best of our knowledge their rich biodiversity has not been explored in term of its microbial wealth. In the present investigation, soil samples were collected from ten selected sites inside SBR and studied for their physicochemical parameter
Braz. J. Microbiol.. Publicado em: 2015-03
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6. Caracterização de biomassas brasileiras para fins de aproveitamento energético / Characterization of brazilian biomasses for energy recovery
New energetic alternatives have been the subject of discussion about conservation of natural resources. Such discourses are based mainly on reducing emissions of greenhouse gases and other pollutants, caused mostly by the use of fossil fuels, major source of energy today. In view of the applicability of biomass as energy input, this paper presents an experim
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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7. Extração induzida por quebra de emulsão: uma nova estratégia para determinação de metais traços em amostras de óleo / Extração induzida por quebra de emulsão: uma nova estratégia para determinação de metais traços em amostras de óleo / Extraction induced by emulsion breaking: a new strategy for the trace metals determination oil sample / Extraction induced by emulsion breaking: a new strategy for the trace metals determination oil sample
The present work reports the development of a novel methodology for the determination of trace metals in organic liquids. The method is based on the extraction induced by emulsion breaking, which is carried out with the formation of a stable emulsion between the oil (10 mL) and an aqueous phase (2 mL) containing a surfactant and acid. After that, the emulsio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/07/2011
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8. Conversão de uso e potencial de estoque do carbono nos diferentes usos do solo e cobertura vegetal na bacia do Ribeirãoo Bom Jardim no Triângulo Mineiro (MG)
Os ambientes do Cerrado (savana brasileira) vêm se modificando pela conversão do uso e manejo das terras. A ocupação do Cerrado brasileiro iniciou-se na década de 1930 e tornou-se área prioritária para expansão da fronteira agrícola a partir da década de 1970, com o início do período de modernização da agricultura brasileira. Imensas áreas de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/02/2011
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9. CARBONATAÇÃO NATURAL DE PROTÓTIPOS DE CONCRETO COM CINZA DE CASCA DE ARROZ SEM MOAGEM / NATURAL CARBONATION IN CONCRETE PROTOTYPES WITH NON-GROUND RICE HUSK ASH
Cement is the construction building material with higher responsibility by carbon dioxide emission of all industrial human activities, besides be a considerably expensive material, more than the rice husk ash in nature. Environmental benefits are generated in its utilization, because rice husk ashes are industrial process residues of the grain processing, th
Publicado em: 2010
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10. Extração supercrítica do óleo de linhaça: construção do extrator, estudo de parâmetros de processo, avaliação química e antioxidante do produto
The aim of the present study was to extract vegetable oil from brown linseed (Linum usitatissimum L.), determine fatty acid levels, the antioxidant capacity of the extracted oil and perform a rapid economic assessment of the SFE process in the manufacture of oil. The experiments were conducted in a test bench extractor capable of operating with carbon dioxid
Publicado em: 2009
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11. Dinâmica do fósforo em latossolo do cerrado sob sistema de integração lavoura-pecuária
The integration of crop-livestock systems (ILP) is one of the alternatives to recover the fertility of soils under degraded pastures in the Cerrado region. This system has positive effects on soil fertility and quality, increasing organic carbon contents and soil biological activity, thus requiring a new characterization of soil fertility by identifying soil
Publicado em: 2008
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12. Detecção amperométrica, com microeletrodos, de espécies reativas de oxigênio e nitrogênio em células isoladas estimuladas por substâncias biologicamente ativas. / Amperometric detection of reactive oxygen and nitrogen species in isolated cells, estimulated by biologically active organic compounds.
The production of reactive oxygen species (ROS) and reactive nitrogen species (RNS) is a metabolic situation, observed in different physiological conditions. When their production is exacerbated, there is an efficient antioxidant system able to control and re-install the homeostasis. Oxidative stress results from an acute and chronic imbalance between the pr
Publicado em: 2008