Consulta: subjectFacets:"Cellulose"
Registros recuperados: 28
Data/hora: 10/06/2024 15:11:37

Contenido y caracterización reológica de los polisacáridos estructurales de nopalitos (Opuntia spp.) en un gradiente de domesticación.
Provedor de dados: 32
Autores: López Palacios, Cristian.
Evidencias diversas indican que la domesticación del género Opuntia comenzó con la selección de variantes de O. streptacantha, seguida de O. hyptiacantha y O. megacantha y se centró en O. albicarpa y O. ficus indica. Las causas por las cuales se domesticó Opuntia fueron por sus frutos y nopalitos. Los polisacáridos más abundantes en los nopalitos son del tipo estructural. La hipótesis que se plantea es que los polisacáridos muestran un gradiente de concentración y sus propiedades reológicas han sido modificadas en función del grado de domesticación de Opuntia. Los polisacáridos estructurales fueron extraídos de cladodios jóvenes de 14 variantes pertenecientes a especies representantes del gradiente de domesticación (O. streptacantha, O. hyptiacantha, O....
Palavras-chave: Opuntia; Gradiente de domesticación; Reología; Fibra alimentaria; Mucílagos; Pectinas; Hemicelulosas; Celulosa; Domestication gradient; Rheology; Dietary fiber; Mucilages; Pectins; Hemicelluloses; Cellulose; Maestría; Botánica.
Ano: 2011
URL: http://hdl.handle.net/10521/354

Efficient expression and characterization of a cold-active endo-1, 4-&amp;#946;-glucanase from Citrobacter farmeri by co-expression of Myxococcus xanthus protein S
Provedor de dados: 69
Autores: Bai,Xi; Yuan,Xianjun; Wen,Aiyou; Li,Junfeng; Bai,Yunfeng; Shao,Tao.
Background: Cold-active endo-1, 4-&amp;#946;-glucanase (EglC) can decrease energy costs and prevent product denaturation in biotechnological processes. However, the nature EglC from C. farmeri A1 showed very low activity (800 U/L). In an attempt to increase its expression level, C. farmeri EglC was expressed in Escherichia coli as an N-terminal fusion to protein S (ProS) from Myxococcus xanthus. Results: A novel expression vector, pET(ProS-EglC), was successfully constructed for the expression of C. farmeri EglC in E. coli. SDS-PAGE showed that the recombinant protein (ProS-EglC) was approximately 60 kDa. The activity of ProS-EglC was 12,400 U/L, which was considerably higher than that of the nature EglC (800 U/L). ProS-EglC was active at pH 6.5-pH 8.0,...
Tipo: Journal article
Palavras-chave: Cellulose degradation; Cellulose; Cold-active enzyme; Endoglucanases; Enzymatic properties; Escherichia coli; Expression; Novel expression vector; N-terminal fusion; Protein S-tag; Recombinant protein.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600012

Generation and analysis of an Eucalyptus globulus cDNA library constructed from seedlings subjected to low temperature conditions
Provedor de dados: 69
Autores: Rasmussen-Poblete,Susana; Valdes,Jorge; Gamboa,Maria Cecilia; Valenzuela,Pablo D.T; Krauskopf,Erwin.
Eucalyptus globulus is the most important commercial temperate hardwood in the world because of its wood properties and due to its characteristics for biofuel production. However, only a very low number of expressed sequence tags (ESTs) are publicly available for this tree species. We constructed a cDNA from E. globulus seedlings subjected to low temperature and sequenced 9,913 randomly selected clones, generating 8,737 curated ESTs. The assembly produced 1,062 contigs and 3,879 singletons forming a Eucalyptus unigene set. Based on BLASTX analysis, 89.3% of the contigs and 88.5% of the singletons had significant similarity to known genes in the non-redundant database of GenBank. The Eucalyptus unigene set generated is a valuable public resource that...
Tipo: Journal article
Palavras-chave: Cellulose; Cold-temperature; EST database; Forest biotechnology; Lignin.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200008

Physiological-enzymatic characteristics and inoculation of mycelial strains of Descolea antarctica Sing. in Nothofagus seedlings
Provedor de dados: 69
Autores: Valenzuela,Eduardo; Hipp,Joseline; Alonso,Claudia; Godoy,Roberto; Alberdi,Miren; Alvarez,Maricel; Saavedra,Isabel.
At present, reforestation has focused on native forests with anthropogenic intervention and eroded soils. There is interest in producing Nothofagus seedlings which can overcome adverse conditions encountered on reforestation sites. It is necessary to find new fungi that can be utilized as mycorrhizal inoculants and that enable the seedlings to increase their tolerance to adverse conditions. Two ectomycorrhizal strains of the fungus Descolea antarctica (D1 and D2) were cultured at different temperatures, pH levels and the activities of amylases, cellulases, and phosphatases were determined. In greenhouse and nursery trials, the growth responses of inoculated Nothofagus obliqua seedlings were evaluated. D1 and D2 exhibited the highest growth rates at 23ºC....
Tipo: Journal article
Palavras-chave: Cellulose; Ectomycorrhizal fungi; Nothofagus; PH; Phosphatase; Temperature.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000200012

Production of cold-adapted cellulase by Verticillium sp. isolated from Antarctic soils
Provedor de dados: 69
Autores: Wang,Nengfei; Zang,Jiaye; Ming,Kaili; Liu,Yu; Wu,Zuohao; Ding,Hui.
Background: Cellulose can be converted to ethanol by simultaneous saccharification and fermentation (SSF). The difference between the optimal temperature of cellulase and microbial fermentation, however, has been identified as the critical problem with SSF. In this study, one fungal strain (AnsX1) with high cellulase activity at low temperature was isolated from Antarctic soils and identified as Verticillium sp. by morphological and molecular analyses. Results: The biochemical properties of crude AnsX1 cellulase samples were studied by filter paper cellulase assay. The maximum cellulase activity was achieved at low temperature in an acidic environment with addition of metal ions. Furthermore, AnsX1 cellulase demonstrated 54-63% enzymatic activity at...
Tipo: Journal article
Palavras-chave: Antarctic soil; Cellulose; Filter paper cellulase assay; Psychrotrophic fungi; Verticillium sp.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000400010

Composição química de plantas de cobertura sob manejo na floração e maturação: efeitos na dinâmica de decomposição de resíduos vegetais.
Provedor de dados: 14
Autores: CARVALHO, A. M. de; SOUZA, L. L. P. de; CASTRO ALVES, P. C. A.; GUIMARAES JUNIOR, R.
bitstream/item/79704/1/bolpd-258.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Green manure; Savanna.; Cerrado; Plantio Direto.; Planta de Cobertura; Cellulose; Hemicellulose; Lignin; No-tillage; Organic matter.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/953747

Teores de hemiceluloses, celulose e lignina em plantas de cobertura com potencial para sistema plantio direto no Cerrado.
Provedor de dados: 14
Autores: CARVALHO, A. M. de; DANTAS, R. DE. A.; COELHO, M. C.; LIMA, W. M.; SOUZA, J. P. S. P. DE; FONSECA, O. P.; GUIMARAES JUNIOR, R.
bitstream/item/75878/1/bolpd-290.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Green manure; Savanna.; Adubo Verde; Celulose; Cerrado; Hemicelulose; Lignina; Plantio Direto.; Hemicellulose; Cellulose; Chemical composition; Lignin; No-tillage; Organic matter.
Ano: 2010
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/883969

Banco de Extratos de Enzimas Fibrolíticas Isoladas de Conteúdo Ruminal (BEEFRUM).
Provedor de dados: 14
Autores: SALLES, H. O.; EGITO, A. S. do; CARNEIRO, J. da C.; XIMENES, L. V.; RIBEIRO, M. T.; RIBEIRO, R. P.; BARBOSA, I. C.; SOUSA, A. M. P.
A criação do banco de extratos composto por enzimas fibrolíticas isoladas de conteúdo ruminal de bovinos, caprinos e ovinos, foi iniciativa da Embrapa Caprinos e Ovinos e da Embrapa Gado de Leite, através de projetos de pesquisa em parceria, e tem como objetivo salvaguardar extratos enzimáticos de nossa biodiversidade para utilização biotecnológica, visando caracterizar, avaliar e identificar possíveis aplicabilidades científicas e/ou industriais das enzimas contidas nesses extratos.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Bioetanol; Enzimas fibrolíticas; Sugar byproducts.; Cellulolysis; Etanol; Cana de açúcar; Bagaço; Celulase; Enzima celulolítica; Cellulose; Biodegradation; Sugarcane; Ethanol.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1087003

A "ucuúba" como fonte de celulose para papel.
Provedor de dados: 14
Autores: MELO, C. F. M. de; SOUZA, H. B. de; LOUREIRO, M. R. C.; WISNIEWSKI, A.
Reunindo excelentes características, a madeira de Ucuúba (Virola surínamensis (Rol) Warb) tem sido extensivamente empregada na fabricação de laminados. Como consequêncía do processo produtivo, a madeira que não pode ser integralmente aproveitada, deixa um apreciável resíduo que, a falta de melhor emprêgo, não tem tido outra utilizaçãc senão como combustível na própria Usina. Estudando-se a ucuúba como fonte de celulose para papel, conclui-se que se trata, na verdade, de excelente matéria: prima, mesmo os resíduos de laminação que se constituem de restos de madeira de várias idades; Podem ser produzidos papéis Kraft de bôa qualidade, em ambos os casos, embora quando se trate da utilização dos resíduos de laminação as características de resistência ao...
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Analysis; Fiber.; Análise; Celulose; Fibra; Madeira; Papel; Ucuuba; Tecnologia; Virola Surinamensis.; Cellulose; Kraft paper; Technology; Wood.
Ano: 1971
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/376076

Nanofibers: Production of cellulose nanofibers.
Provedor de dados: 14
Autores: VALADARES, L. F.
Technology for obtaining cellulose nanofibers from agro-industrial residues or pure cellulose sources by pretreatment and hydrolysis.
Tipo: Folders
Palavras-chave: Nanofibers; Cellulose; Hydrolysis.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133077

Lignocellulosic biomass: organosolv process for lignocellulosic biomass fractionation.
Provedor de dados: 14
Autores: GAMBETTA, R.
Organosolv process for lignocellulosic biomass fractionation that eliminates the washing step and decreases the precipitation of dissolved/extracted lignin on cellulose fibers.
Tipo: Folders
Palavras-chave: Organosolv; Biomass production; Cellulose; Fractionation.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133102

Viagem de estudos e de observações ao Japão.
Provedor de dados: 14
Autores: MELO, C. F. M. de.
bitstream/item/197880/1/FL00628.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Japão; Celulose; Indústria; Papel; Pesquisa; Cellulose; Industry; Paper; Research.
Ano: 1976
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/374604

Nanocomposites: Production of rubber and cellulose nanocomposites.
Provedor de dados: 14
Autores: VALADARES, L. F.
Process for obtaining rubber and cellulose nanocomposites using natural rubber and cellulose nanofibers to produce reinforced elastomeric material.
Tipo: Folders
Palavras-chave: Elastomeric material; Rubber; Cellulose; Nanocomposites; Renewable resources.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1133088

O "Para-Pará" e o "Amapá" como fontes de celulose para papel.
Provedor de dados: 14
Autores: MELO, C. F. M. de; SOUZA, H. B. de; LOUREIRO, M. R. C.
bitstream/item/146495/1/SERIE-TECNOLOGIA.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Amapa; Parahancornia; Long fiber; Analysis.; Análise; Celulose; Comprimento; Fibra; Madeira; Papel; Tecnologia.; Jacaranda copaia; Cellulose; Paper; Technology; Wood.
Ano: 1971
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/376075

Interrelations entre des communautes mixtes de bacteries anaerobies isolees de sediments marins
Provedor de dados: 5
Autores: Marty, D.
The mineralization of cellulose was examined in mono and cocultures of marine anaerobic bacteria (cellulolytic bacteria, fermentative non-cellulolytic bacteria and methane-producing bacteria). These studies displayed interactions between these groups of microorganisms: inhibition relationships (inhibition of methanogens during active growth of fermentative bacteria) and syntrophic relationships (growth of fermentative non-cellulolytic bacteria depended on metabolites produced by cellulolytic bacteria; increased in rate of cellulose hydrolysis in presence of fermentative non-cellulolytic bacteria; interspecies H sub(2) transfer reaction between fermentative bacteria and methane-producing bacteria).
Tipo: Text
Palavras-chave: Biogeochemistry; Sedimentation; Sediments; Fermentation; Mineralization; Cellulose; Methanogenesis; Interspecific relationships; Anaerobic bacteria.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-948.pdf

Diet components as internal indicators in the determination of the apparent digestibility coefficients for Nile tilapia
Provedor de dados: 86
Autores: Silva,Rafael Lopes da; Araújo,Eric Portilho de; Rocha,Mariucha Karina Honório Ribeiro; Damasceno,Flavia Mota; Freitas,Jakeline Marcela Azambuja de; Sartori,Maria Márcia Pereira; Meirelles,Paulo Roberto de Lima; Barros,Margarida Maria; Pezzato,Luiz Edivaldo.
Abstract: The objective of this work was to evaluate the diet components - crude fiber, neutral detergent fiber, acid detergent fiber, hemicellulose, cellulose, and lignin - as internal indicators in the determination of the apparent digestibility coefficients of dry matter, gross energy, and of the nutrients - crude protein, phosphorus, and amino acids - in Nile tilapia (Oreochromis niloticus). Groups of ten juveniles (80.3±1 g) were randomly distributed in six tanks of 250 L and fed two practical diets, either of a plant-origin diet or of a plant- and animal-origin diet. Both diets were supplemented with 0.1% chromium (III) oxide (Cr2O3). Faeces were collected by the modified Guelph system. The apparent digestibility coefficients were determined by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Cellulose; Fiber; Nutrients.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000600393

Growth and antimicrobial activity of lactic acid bacteria from rumen fluid according to energy or nitrogen source
Provedor de dados: 96
Autores: Carvalho,Isabela Pena Carvalho de; Detmann,Edenio; Mantovani,Hilário Cuquetto; Paulino,Mário Fonseca; Valadares Filho,Sebastião de Campos; Costa,Viviane Aparecida Carli; Gomes,Daiany Iris.
The objective of this study was to evaluate the effects of supplementation with different sources of energy and nitrogenous compounds on the in vitro growth and production of bacteriocin of lactic acid bacteria. Incubations were performed by using ruminal fluid from a rumen-fistulated Holstein-Zebu steer. The animal was kept on a Brachiaria decumbens pasture receiving 200 g/day of supplemental crude protein. Substrates and inoculum were placed in glass flasks considering eight treatments: cellulose, cellulose and casein, cellulose and soy peptone, cellulose and urea, starch, starch and casein, starch and soy peptone and starch and urea. Successive incubations were conducted to select microorganisms according to the energy sources and nitrogenous compounds....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacteriocin; Cellulose; Protein effect; Rumen microbiology.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000600014

Effect of different substrates on composting of poultry litter
Provedor de dados: 96
Autores: Orrico,Ana Carolina Amorim; Centurion,Stanley Ribeiro; Farias,Romildo Marques de; Orrico Junior,Marco Antonio Previdelli; Garcia,Rodrigo Garófallo.
The objective was to evaluate the differences between distinct types of litter material and their combinations in the dynamics of degradation on the organic matter fractions and the quality of the final compound. The treatments were established according to material used as substrate for broiler litter: treatment 1 - rice husks; 2 - sugar cane bagasse; 3 - wood shavings; 4 - wood shavings + sugar cane bagasse; 5 - rice husks + sugar cane bagasse; and 6 - Napier grass. The following variables were monitored: temperature, levels of total solids (TS), volatile solids (VS), mass and volume of the pile, fibrous fraction, and levels and reductions of N, P and K during the process. Piles formed with Napier grass and sugar cane bagasse presented the highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler production; Cellulose; Lignin; Temperature; Total solids.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700028

Growth and endoglucanase activity of Acetivibrio cellulolyticus grown in three different cellulosic substrates
Provedor de dados: 59
Autores: Sanchez,Cássia Regina; Peres,Clarita Schvartz; Barbosa,Heloiza Ramos.
The growth kinetics of Acetivibrio cellulolyticus grown in medium containing different carbon sources (cellobiose, amorphous or crystalline cellulose) was investigated. The specific growth rate was higher in cellobiose fed cultures than in the presence of the other two substrates. Endoglucanase production was greater in cultures grown on amorphous cellulose; enzyme activity increased during the stationary phase in cultures grown on crystalline cellulose.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acetivibrio cellulolyticus; Endoglucanase activity; Cellulose.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37141999000400004

Optimized acid hydrolysis of the polysaccharides from the seaweed Solieria filiformis (Kützing) P.W. Gabrielson for bioethanol production
Provedor de dados: 3
Autores: Castro, George Meredite Cunha de; Benevides, Norma Maria Barros; Cabral, Maulori Curié; Miranda, Rafael de Souza; Gomes Filho, Enéas; Rocha, Maria Valderez Ponte; Araújo, Marjory Lima Holanda.
 The seaweeds are bio-resource rich in sulfated and neutral polysaccharides. The tropical seaweed species used in this study (Solieria filiformis), after dried, shows 65.8% (w/w) carbohydrate, 9.6% (w/w) protein, 1.7% (w/w) lipid, 7.0% (w/w) moisture and 15.9% (w/w) ash. The dried seaweed was easily hydrolyzed under mild conditions (0.5 M sulfuric acid, 20 min.), generating fermentable monosaccharides with a maximum hydrolysis efficiency of 63.21%. Galactose and glucose present in the hydrolyzed were simultaneously fermented by Saccharomyces cerevisiae when the yeast was acclimated to galactose and cultivated in broth containing only galactose. The kinetic parameters of the fermentation of the seaweed hydrolyzed were Y(P⁄S) = 0.48 ± 0.02 g.g−1, PP = 0.27 ±...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências da Vida  Bioquímica iota-carrageenan; Cellulose; Galactose; Kinetic parameters; Fermentation; Acclimation; Sulfuric acid. Biotecnologia.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/37227

Materials from renewable resources: new properties and functions
Provedor de dados: 42
Autores: GALEMBECK,FERNANDO; BURGO,THIAGO A.L.; SILVA,DOUGLAS S. DA; SANTOS,LEANDRA P.
Abstract: Sustainable production requires increasing use of raw materials from renewable sources, processed under mild conditions with minimal effluent production. These requirements are satisfied by using materials derived from biomass, in synergy with food and energy production. The possibilities of biomass are continuously enlarged by new findings, as in the intrinsic nanocomposite properties of natural rubber and the amphiphile behavior of cellulose that translated into new functional materials, including high-performance, flexible and conductive non-metallic materials. Other findings are allowing a better understanding of electrostatic phenomena that play a positive role in electrostatic adhesion and cohesion of nanocomposites made from biomass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulose; Electrostatics; Nanocomposites; Natural rubber.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700401

Thermal and spectroscopic analyses on the molecular interaction between eucalyptus kraft pulp components and offset printing inks
Provedor de dados: 52
Autores: Alves,Ericka Figueiredo; Oliveira,Rubens Chaves de; Silva,Luis Henrique Mendes da; Colodette,Jorge Luiz.
Thermal and infrared spectroscopic analyzes were carried out in order to study the kind of interaction between the anatomical components of the bleached eucalyptus kraft pulp with offset inks. A Bauer-McNett fiber classifier was used in order to obtain the anatomical components of the pulp, separately. The determinations of the enthalpy of the processes occurring in the samples of inks and pulp, as well as the enthalpy of these components interactions were obtained by Differential Scanning Calorimetry. In the interaction between pulp and offset ink, the reduced enthalpy values of the endothermic peak were interpreted as due to the released energy for adhesion of the ink pigment to the substratum. The low enthalpy value, 58 to 121 cal.g -, ¹indicated that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Differential scanning calorimetry; Thermogravimetry; Kraft pulping; Cellulose; Interaction; Eucalyptus sp.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300021

Dietary cellulose has no effect on the regeneration of hemoglobin in growing rats with iron deficiency anemia
Provedor de dados: 56
Autores: Catani,M.; Amâncio,O.M.S.; Fagundes-Neto,U.; Morais,M.B.
The objective of the present study was to determine the effect of cellulose on intestinal iron absorption in rats during recovery from iron deficiency anemia. Twenty-one-day-old male Wistar-EPM rats were fed an iron-free ration for two weeks to induce anemia. At 5 weeks of age, the rats were divided into two groups (both groups receiving 35 mg of elemental iron per kg diet): cellulose group (N = 12), receiving a diet containing 100 g of cellulose/kg and control (N = 12), receiving a diet containing no cellulose. The fresh weight of the feces collected over a 3-day period between the 15th and 18th day of dietary treatment was 10.7 ± 3.5 g in the group receiving cellulose and 1.9 ± 1.2 g in the control group (P&lt;0.001). Total food intake was higher in the...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Iron deficiency; Dietary fiber; Cellulose; Iron absorption.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000600002

Cellulase activity and dissolved organic carbon release from lignocellulose macrophyte-derived in four trophic conditions
Provedor de dados: 58
Autores: Bottino,Flávia; Cunha-Santino,Marcela Bianchessi; Bianchini Jr.,Irineu.
Abstract Considering the importance of lignocellulose macrophyte-derived for the energy flux in aquatic ecosystems and the nutrient concentrations as a function of force which influences the decomposition process, this study aims to relate the enzymatic activity and lignocellulose hydrolysis in different trophic statuses. Water samples and two macrophyte species were collected from the littoral zone of a subtropical Brazilian Reservoir. A lignocellulosic matrix was obtained using aqueous extraction of dried plant material (≈40 °C). Incubations for decomposition of the lignocellulosic matrix were prepared using lignocelluloses, inoculums and filtered water simulating different trophic statuses with the same N:P ratio. The particulate organic carbon and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anaerobic decomposition; Cellulose; Carbon cycle; Aquatic macrophytes.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200352

Alkali pretreated of wheat straw and its enzymatic hydrolysis
Provedor de dados: 58
Autores: Han,Lirong; Feng,Juntao; Zhang,Shuangxi; Ma,Zhiqing; Wang,Yonghong; Zhang,Xing.
The efficiency of enzymatic hydrolysis of cellulose can be improved by various pretreatments of the substrate. In order to increase the efficiency of enzymatic saccharification of the wheat straw, we determined the effect of different pretreatments on the physical structure, chemical components and enzymatic saccharification of wheat straw. Our results showed that combination of grinding and sodium hydroxide (NaOH) treatment had high effect on the enzymatic hydrolysis of wheat straws. The optimal pretreatment condition was to grind the wheat straws into the sizes of 120 meshes followed by treatment with 1.0% NaOH for 1.5 h (121°C/15psi). Under this condition, the cellulose content of wheat straw was increased by 44.52%, while the content of hemicellulose...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulase; Cellulose; Fermentation; Hydrolysis; Lignocellulosic; Pretreatment.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000100006

Cellulase activities during decomposition of a submerged aquatic macrophyte (Utricularia breviscapa): a microcosm assay
Provedor de dados: 58
Autores: Cunha-Santino,Marcela B. da; Bianchini Jr.,Irineu.
Decomposition of lignocellulosic detritus at enzymatic level is the rate-limiting step during aquatic macrophyte decomposition. Assays were carried out to evaluate cellulase activity during decomposition of Utricularia breviscapa; the assays included the following C-sources: leachate, lignocellulosic matrix and integral detritus. The incubations comprised U. breviscapa C-sources added to Óleo lagoon (21º 36'S and 47º 49'W) water maintained in the dark under anaerobic condition at 15ºC, 20ºC, 25ºC and 30ºC. Cellulase activity were monitored during 180 days, with the activity showing a time evolution that depended on the temperature and type of detritus: (i) cellulase activity tended to occur earlier with increasing temperatures, but it was less intense than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cellulase; Utricularia breviscapa; Cellulose.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822007000200008

Decomposition of the Rubber Tree Hevea brasiliensis Litter at Two Depths
Provedor de dados: 117
Autores: Gréggio,Thiago Claudino; Assis,Luiz Carlos; Nahas,Ely.
The decomposition of soil litter contributes to maintaining agricultural sustainability, since the nutrients released by microbial activity are determinants of the net productivity of the agroecosystem. The decomposition of rubber tree (Hevea brasiliensis [Willd. ex A. Juss.] Müll. Arg.) leaves located on the surface and buried in at 10 cm depth in Forest and Savannah (Cerradão) soils (Oxisols) was studied, with emphasis on the production of CO2 and the monthly variation of the remaining amounts of litter mass, soluble substances, cellulose and lignin. To evaluate CO2 production, H. brasiliensis leaves were incubated for 30 days in soils from the 0-2 cm and 10-12 cm layers. CO2 production increased in the 0-2 cm layer in comparison to the 10-12 cm layer....
Tipo: Journal article
Palavras-chave: Litter mass; Cellulose; Lignin; Soluble substances; Litter-bags.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000200002

Use of markers to determine the ileal digestibility of amino acids for swine
Provedor de dados: 64
Autores: Pozza,Paulo Cesar; Gomes,Paulo Cezar; Pozza,Magali Soares Santos; Nunes,Ricardo Vianna; Ferreira,Rony Antônio; Rodrigueiro,Ramalho José Barbosa.
Many markers can be used in digestibility assays for swine, but needs to be evaluated before its use. An assay was carried out with the objective of measuring the coefficients of ileal apparent (CIAD) and standardized digestibility (CISD) of amino acids in meat and bone meal for swine using different markers. Eight crossbred barrows were equipped with T-cannulas in the distal ileum. Four animals received a free protein diet and another four received a diet containing meat and bone meal as the only protein source in the diet. The treatments consisted in evaluating the chromic oxide, acid-insoluble ash naturally occurring in the diet, cellulose and lignin as markers to determine the apparent and standardized digestibility of the amino acids contained in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acid-insoluble ash; Cellulose; Chromic oxide; Lignin; Simple T-cannula.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000300009