Organics Acids
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Caracterização de contaminantes presentes em sistemas de tratamento de esgotos, por cromatografia líquida acoplada à espectrometria de massas tandem em alta resolução
This work shows results on the characterization, by liquid chromatography coupled to high resolution tandem mass spectrometry (LC-IT-TOF-MS) with electrospray ionization, of organic compounds present in raw and treated effluents from a combined sewage treatment systems (upflow anaerobic sludge blanket-trickling filter). The sewage samples were prepared by C1
Química Nova. Publicado em: 2010
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2. BIOFILM FORMATION ON SUPERDUPLEX STAINLESS STEEL UNS S32750 IN DYNAMIC FLOW SYSTEM / FORMAÇÃO DE BIOFILMES EM AÇO SUPERDUPLEX UNS S32750 EM SISTEMA DINÂMICO
The goal of this work is to determine the biofilm colonization on the surface of superduplex stainless steel S32750 by Sulfate Reducing Bacteria (SRB) in a flow loop at constant flow rate and room temperature, exposed to artificial sea water. The duplex stainless steel has been widely used as material for offshore applications due to their excellent corrosio
Publicado em: 2008
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3. Glutamine, glutamic acid and or yeast extract in the diet of weaned pigs / Glutamina, ácido glutâmico e ou extrato de levedura na dieta de leitoes desmamados
The present study aimed to evaluate the effects of the supplementation of different sources of protein concentrates, glutamine, acid glutamic and or yeast extract in diets of piglets from 26 to 44 days of age. At 22nd day of age, weaning day, 210 piglets, females and castrated males, crossbred of Landrace, Large White and Duroc races, with 6,79 kg average we
Publicado em: 2008
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4. The impact of kappa number composition on eucalyptus kraft pulp bleachability
Consumption of chemicals during ECF bleaching of kraft pulp correlates reasonably well with kappa number, which measures with KMnO4 the total amount of oxidizable material in the pulp. However, the method does not distinguish between the oxidizable material in residual lignin and other structures susceptible to oxidation, such as hexenuronic acids (HexAs), e
Brazilian Journal of Chemical Engineering. Publicado em: 2007-03
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5. "Application of voltametric and HPLC techniques on the monitorins of organic acids production in fermented milk samples by Kefir and Tibet grains" / "Monitoramento da produção de ácidos orgânicos em amostras de leite fermentado pelos grãos de Kefir e do Tibet utilizando técnicas voltamétricas e HPLC"
The products formed during the milk fermentation using the kefir and tibet grains (popularly known species) were studied in this work. The kefir grain is a symbiotic association of microorganisms that includes several species of lactic acid bacteria (Lactobacillus, Lactococcus, Leuconostoc), yeasts (Saccharomyces cereviseae) and acetic acid bacteria (Acetoba
Publicado em: 2006
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6. AVALIAÇÃO DE PROMOTORES DE CRESCIMENTO ALTERNATIVOS EM SUBSTITUIÇÃO AOS CONVENCIONAIS SOBRE O DESEMPENHO, CARACTERÍSTICAS DE CARCAÇA E MORFOMETRIA INTESTINAL EM FRANGOS DE CORTE / Evaluation of alternative growth promoters in order to substitute the conventionals on the performance, carcass yield and intestinal morphology of broilers
The experiment was conducted at the Laboratory of Poultry (LAVIC) of the Department of Animal Science at Federal University of Santa Maria - RS, from November of 2003 to January of 2004 aiming to evaluate the use of prebiotics, organic acids (acidifiers), enzymes and garlic (phytotherapeutic) as alternative growth promoters, instead of the conventionals (ant
Publicado em: 2004
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7. The missing organic molecules on Mars
GC-MS on the Viking 1976 Mars missions did not detect organic molecules on the Martian surface, even those expected from meteorite bombardment. This result suggested that the Martian regolith might hold a potent oxidant that converts all organic molecules to carbon dioxide rapidly relative to the rate at which they arrive. This conclusion is influencing
The National Academy of Sciences.
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8. Effects of humic and fulvic acids on poliovirus concentration from water by microporous filtration.
Because naturally occurring organic matter is thought to interfere with virus adsorption to microporous filters, humic and fulvic acids isolated from a highly colored, soft surface water were used as model organics in studies on poliovirus adsorption to and recovery from electropositive Virosorb 1MDS and electronegative Filterite filters. Solutions of activa
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9. Mineralization of Surfactants by the Microbiota of Submerged Plant Detritus
In wetlands and canopied bodies of water, plant detritus is an important source of carbon and energy. Detrital materials possess a large surface area for sorption of dissolved organics and are colonized by a large and diverse microbiota. To examine the biodegradation of surfactants by these microorganisms, submerged oak leaves were obtained from a laundromat
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10. Effects of chemical speciation in growth media on the toxicity of mercury(II).
The toxicity of metals, including mercury, is expressed differently in different media, and the addition of soluble organics to the growth medium can have a significant impact on bioassay results. Although the effect of medium composition on metal toxicity is generally attributed to its effect on metal speciation (i.e., the chemical form in which the metal o
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11. Organic protomolecule assembly in igneous minerals
C—H stretching bands, νCH, in the infrared spectrum of single crystals of nominally high purity, of laboratory-grown MgO, and of natural upper mantle olivine, provide an “organic” signature that closely resembles the symmetrical and asymmetrical C—H stretching modes of aliphatic —CH2 units. The νCH bands indicate that H2O and CO2, dissolved
The National Academy of Sciences.