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Id: lil-788963
Autor: Blanco, Alina Sánchez; Durive, Osmar Palacios; Pérez, Sulema Batista; Montes, Zoraida Díaz; Guerra, Nelson Pérez.
Título: Simultaneous production of amylases and proteases by Bacillus subtilis in brewery wastes
Fonte: Braz. j. microbiol;47(3):665-674, July-Sept. 2016. tab, graf.
Idioma: en.
Resumo: ABSTRACT The simultaneous production of amylase (AA) and protease (PA) activity by Bacillus subtilis UO-01 in brewery wastes was studied by combining the response surface methodology with the kinetic study of the process. The optimum conditions (T = 36.0 °C and pH = 6.8) for high biomass production (0.92 g/L) were similar to the conditions (T = 36.8 °C and pH = 6.6) for high AA synthesis (9.26 EU/mL). However, the maximum PA level (9.77 EU/mL) was obtained at pH 7.1 and 37.8 °C. Under these conditions, a considerably high reduction (between 69.9 and 77.8%) of the initial chemical oxygen demand of the waste was achieved. In verification experiments under the optimized conditions for production of each enzyme, the AA and PA obtained after 15 h of incubation were, respectively, 9.35 and 9.87 EU/mL. By using the Luedeking and Piret model, both enzymes were classified as growth-associated metabolites. Protease production delay seemed to be related to the consumption of non-protein and protein nitrogen. These results indicate that the brewery waste could be successfully used for a high scale production of amylases and proteases at a low cost.
Descritores: Peptídeo Hidrolases/biossíntese
Bacillus subtilis/metabolismo
Fermentação
Amilases/biossíntese
Resíduos Industriais
-Temperatura Ambiente
Cinética
Biotransformação
Metabolismo dos Carboidratos
Concentração de Íons de Hidrogênio
Responsável: BR1.1 - BIREME


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Id: lil-520217
Autor: Parvathi, Ammini; Krishna, Kiran; Jose, Jiya; Joseph, Neetha; Nair, Santha.
Título: Biochemical and molecular characterization of Bacillus pumilus isolated from coastal environment in Cochin, India / Caracterização bioquímica e molecular de Bacillus pumilus isolado do ambiente costeiro de Cochin, Índia
Fonte: Braz. j. microbiol;40(2):269-275, Apr.-June 2009. ilus, tab.
Idioma: en.
Resumo: Bacillus species constitute a diverse group of bacteria widely distributed in soil and the aquatic environment. In this study, Bacillus strains isolated from the coastal environment of Cochin, India were identified by detailed conventional biochemical methods, fatty acid methyl ester (FAME) analysis and partial 16S rDNA sequencing. Analysis of the data revealed that Bacillus pumilus was the most predominant species in the region under study followed by B. cereus and B. sphaericus. The B. pumilus isolates were further characterized by arbitrarily primed PCR (AP-PCR), antibiotic sensitivity profiling and PCR screening for known toxin genes associated with Bacillus spp. All B. pumilus isolates were biochemically identical, exhibited high protease and lipase activity and uniformly sensitive to antibiotics tested in this study. One strain of B. pumilus harboured cereulide synthetase gene cesB of B. cereus which was indistinguishable from rest of the isolates biochemically and by AP-PCR. This study reports, for the first time, the presence of the emetic toxin gene cesB in B. pumilus.

As espécies de Bacillus constituem um grupo diversificado de bactérias amplamente distribuídas no solo e no ambiente aquático. Neste estudo, cepas de Bacillus isoladas do ambiente costeiro de Cochin, Índia, foram identificadas através de métodos bioquímicos convencionais, análise de ésteres metílicos de ácidos graxos (FAME) e sequenciamento de 16S rDNA. A análise dos dados revelou que Bacillus pumilus foi a espécie predominante na região estudada, seguido de B. cereus e B. sphaericus. Os isolados de B. pumilus foram caracterizados através da reação em cadeia da polimerase com primers arbitrários (AP-PCR), perfil de sensibilidade a antibióticos e triagem por PCR de genes de toxinas associadas com Bacillus spp. Todos os isolados de B. pumilus foram bioquimicamente idênticos, apresentaram elevada atividade de protease e lipase e foram uniformemente sensíveis aos antibióticos estudados. Um dos isolados de B. pumilus apresentou o gene cesB de B. cereus, que não foinão distinguível dos demais isolados por testes bioquímicos nem por AP-PCR. Este é o primeiro relato da presença do gene cesB da toxina eméticaem B. pumilus.
Descritores: Aspergillus flavus/genética
Bacillus/isolamento & purificação
Técnicas In Vitro
Lipase/genética
Peptídeo Hidrolases/genética
Pimenta/genética
Reação em Cadeia da Polimerase
Sequência de Bases
Ácidos Graxos/análise
-Ambiente Aquático
Métodos
Solo
Técnicas
Tipo de Publ: Relatório Técnico
Responsável: BR32.1 - Serviço de Biblioteca e Informação Biomédica


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Id: biblio-1015977
Autor: Calin, Mariana; Constantinescu-Aruxandei, Diana; Alexandrescu, Elvira; Raut, Iuliana; Badea Doni, Mihaela; Arsene, Melania-Liliana; Oancea, Florin; Jecu, Luiza; Lazar, Veronica.
Título: Degradation of keratin substrates by keratinolytic fungi
Fonte: Electron. j. biotechnol;28:101-112, July. 2017. ilus, graf, tab.
Idioma: en.
Projeto: Ministry of National Education.
Resumo: Background: The hydrolysis of keratin wastes by microorganisms is considered a biotechnological alternative for recycling and valorization through keratinolytic microorganisms. Despite their resistant structure, keratin wastes can be efficiently degraded by various microorganisms through the secretion of keratinases, which are promising enzymes for several applications, including detergents, fertilizers, and leather and textile industry. In an attempt to isolate keratinolytic microorganisms that can reach commercial exploitation as keratinase producers, the current work assesses the dynamics of keratin biodegradation by several keratinolytic fungal strains isolated from soil. The activity of fungal strains to degrade keratin substrates was evaluated by SEM, FTRIR-ATR spectra and TGA analysis. Results: SEM observations offered relevant information on interactions between microorganism and structural elements of hair strands. FTIR spectra of the bands at 1035­1075 cm-1 assigned to sulfoxide bond appeared because of S­S bond breaking, which demonstrated the initiation of keratin biodegradation. According to TGA, in the second zone of thermal denaturation, where keratin degradation occurs, the highest weight loss of 71.10% was obtained for sample incubated with Fusarium sp. 1A. Conclusions: Among the tested strains, Fusarium sp. 1A was the most active organism in the degradation process with the strongest denaturation of polypeptide chains. Because keratinolytic microorganisms and their enzymes keratinases represent a subject of scientific and economic interest because of their capability to hydrolyze keratin, Fusarium sp. 1A was selected for further studies.
Descritores: Fungos/enzimologia
Fungos/metabolismo
Queratinas/metabolismo
-Peptídeo Hidrolases/metabolismo
Termogravimetria
Trichoderma/metabolismo
Trichophyton/metabolismo
Biodegradação Ambiental
Microscopia Eletrônica de Varredura
Cladosporium/metabolismo
Espectroscopia de Infravermelho com Transformada de Fourier
Fusarium/metabolismo
Hidrólise
Queratinas/química
Microsporum/metabolismo
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1002712
Autor: Frías-Quintana, Carlos Alfonso; Álvarez-González, Carlos Alfonso; Guerrero-Zárate, Rocío; Valverde-Chavarría, Silvia; Ulloa-Rojas, Juan B.
Título: Changes in digestive enzymes activities during the initial ontogeny of wolf cichlid, Parachromis dovii (Perciformes: Cichlidae)
Fonte: Neotrop. ichthyol;17(1):e180161, 2019. graf.
Idioma: en.
Projeto: SIA.
Resumo: Wolf cichlid, Parachromis dovii, is a species with a high potential for aquaculture in Central America; however, the knowledge of the digestive physiology in larvae period is limited. For these reason, this study evaluated the changes on digestive enzymes (alkaline and acid proteases, trypsin, chymotrypsin, aminopeptidase, carboxypeptidase, lipases, amylases, and phosphatases) during early ontogeny by biochemical analysis. All digestive enzymes were detected at first feeding (6 days after hatching, DAH, 9.49 mm, 168 degree-days DD). Afterwards all enzymes reached two main peaks in activity at 14 or 22 DAH (15.10 mm, 364 DD and 20.83 mm, 550 DD, respectively). Later, there was a gradual decrease in activity for trypsin and acid and alkaline phosphatases until reach the lowest values at 41 DAH. In the case of acid proteases, chymotrypsin, aminopeptidase, carboxypeptidase, lipase and amylase, all activities reached their maximum values at the end of the larval period, except for alkaline proteases, which showed the maximum value at 14 DAH (15.10 mm, 364 DD). Parachromis dovii larvae have an early capability to hydrolyze exogenous food, agreeing with other carnivorous neotropical cichlid species, for this reason we proposed that the weaning process could begin at 14 DAH.(AU)

El guapote lagunero (Parachromis dovii) es una especie con un alto potencial para la acuicultura en la región de América Central; sin embargo, existe un conocimiento limitado sobre la capacidad digestiva en el periodo larval. Por este motivo, este estudio evaluó los cambios de las enzimas digestivas (proteasas alcalinas y ácidas, tripsina, quimotripsina, aminopeptidasa, carboxipeptidasa, lipasas, amilasas y fosfatasas) durante la ontogenia temprana mediante análisis bioquímico. Todas las enzimas digestivas analizadas se detectaron en la primera alimentación (6 días después de la eclosión, DAH, 9.49 mm, 168 día-grados DD). Después, todas las enzimas alcanzaron dos picos máximos a los 14 o 22 DAH (15.10 mm, 364 DD and 20.83 mm, 550 DD, respectivamente). Después las actividades tripsina, fosfatasas ácidas y alcalina disminuyeron a sus valores más bajos a los 41 DAH. En el caso de las proteasas ácidas y alcalinas, quimotripsina, aminopeptidasa, carboxipeptidasa, lipasa y amilasa, los niveles de actividad aumentaron y alcanzaron su máximo valor al final del período larvario, excepto las proteasas alcalinas, que mostraron su máximo valor a los 14 DAH (15.10 mm, 364 DD). Las larvas de P. dovii tienen una capacidad temprana para hidrolizar alimentos exógenos, lo que concuerda con otras especies de cíclidos neotropicales carnívoros, por lo que proponemos que el proceso de destete inicie a los 14 DAH.(AU)
Descritores: Peptídeo Hidrolases/síntese química
Ciclídeos/fisiologia
Ativação Enzimática
-Aquicultura
Limites: Animais
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice


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Beloti, Vanerli
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Id: biblio-976488
Autor: Ribeiro Júnior, José C; Teider Junior, Pedro I; Oliveira, André L. M; Rios, Edson A; Tamanini, Ronaldo; Beloti, Vanerli.
Título: Proteolytic and lipolytic potential of Pseudomonas spp. from goat and bovine raw milk / Potencial proteolítico e lipolítico de espécies de Pseudomonas do leite cru caprino e bovino
Fonte: Pesqui. vet. bras = Braz. j. vet. res;38(8):1577-1583, Aug. 2018. tab, graf.
Idioma: en.
Projeto: CNPq; . CAPES.
Resumo: Pseudomonas, the main genus of gram-negative microorganisms isolated from milk, is psychrotrophic, biofilm-forming, and thermo-resistant deteriorating enzyme producers. The aim of this study was to quantify Pseudomonas spp. in goat's and cow's milk produced in the Paraná state, Brazil, to evaluate the deteriorating activity of the isolates at mesophilic and psychrotrophic conditions and to identify, at the species level, the isolates with alkaline metalloprotease (aprX gene) production potential. Microbiological, biochemical and molecular methods were used for isolating, confirming and identifying of isolates. The mean counts were 1.6 (±6.3)x104 and 0.89(±3)x102 CFU/mL for goat and bovine milk samples, respectively, immediately after milking. Of the Pseudomonas colonies isolated from goat milk (n=60), 91.7% showed proteolytic potential when incubated at 35°C/48 h and 80% at 7°C/10 days, and lipolytic potential was observed in 95% of the isolates incubated in mesophilic and 78.3% at refrigeration conditions. From the isolates of bovine milk (n=20), 35% showed proteolytic activity only when incubated at 35°C/48 h, and lipolytic potential was observed in 25% of the isolates incubated at 7°C/10d and 35°C/48h. It was observed that 83.3% and 25% of the isolates genetically confirmed as Pseudomonas spp. of goat and bovine milk showed the potential for alkaline metalloprotease production, with the species P. azotoformans, P. koreensis, P. gessardii, P. monteilii and P. lurida being the most frequent in goat milk and P. aeruginosa the only species identified in cow milk.(AU)

Pseudomonas é o principal gênero de micro-organismos Gram negativos isolados do leite, são psicrotróficos, formadores de biofilmes e produtores de enzimas deteriorantes termodúricas. O objetivo do presente trabalho foi quantificar Pseudomonas spp. no leite de cabras e vacas produzido no estado do Paraná, Brasil, avaliar a atividade deteriorante em temperatura mesofílica e psicrotrófica e identificar, em nível de espécie, os isolados com potencial de produção de metaloprotease alcalina (geneaprX). Foram utilizados métodos microbiológicos, bioquímicos e moleculares para isolamento, confirmação e identificação dos isolados. As contagens médias foram de 1,6 (±6,3) x 104 e 0,9 (±3) x 102 UFC/mL para as amostras de leite caprino e bovino, respectivamente. Dos isolados de Pseudomonas do leite de cabra (n=60), 91,7% demonstraram potencial proteolítico quando incubadas a 35°C/48h e 80% a 7°C/10dias e lipolíticos em 95% dos isolados incubados em mesofilia e em 78,3% dos incubados em temperatura de refrigeração. Dos isolados do leite bovino (n=20), foi verificada atividade proteolítica de 35% apenas quando incubadas a 35°C/48h e lipolítica em 25% dos isolados incubados a 7°C/10d e 35°C/48h. Foi observado que 83,3% e 25% dos isolados confirmados geneticamente como Pseudomonas spp. do leite caprino e bovino, respectivamente, apresentaram o potencial de produção de metaloprotease alcalina, sendo as espécies P. azotoformans, P. koreensis, P. gessardii, P. monteilii e P. lurida as mais frequentes no leite de cabras e P. aeruginosa a única identificada do leite de vacas.(AU)
Descritores: Peptídeo Hidrolases
Pseudomonas/enzimologia
Leite/química
-Ruminantes
Limites: Animais
Bovinos
Responsável: BR68.1 - Biblioteca Virginie Buff D'Ápice


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Id: biblio-893617
Autor: GOMES, Cinthya Cristina; GUIMARÃES, Ludmila Silva; PINTO, Larissa Christina Costa; CAMARGO, Gabriela Alessandra da Cruz Galhardo; VALENTE, Maria Isabel Bastos; SARQUIS, Maria Inêz de Moura.
Título: Investigations of the prevalence and virulence of Candida albicans in periodontal and endodontic lesions in diabetic and normoglycemic patients
Fonte: J. appl. oral sci;25(3):274-281, May-June 2017. tab, graf.
Idioma: en.
Projeto: Rio de Janeiro Research Foundation.
Resumo: Abstract Pulpal and periodontal tissues have similar microbiota that allows cross-contamination between the pulp and periodontal tissues. Objective The aim of this study was to investigate the prevalence of isolated Candida albicans from periodontal endodontic lesions in diabetic and normoglycemic patients, and the fungi's virulence in different atmospheric conditions. Material and Methods A case-control study was conducted on 15 patients with type 2 diabetes mellitus (G1) and 15 non-diabetics (G2) with periodontal endodontic lesions. Samples of root canals and periodontal pockets were plated on CHROMagar for later identification by polymerase chain reaction (PCR) and virulence test. Results C. albicans was identified in 79.2% and 20.8% of the 60 samples collected from diabetic and normoglycemic patients, respectively. Of the 30 samples collected from periodontal pockets, 13 showed a positive culture for C. albicans, with 77% belonging to G1 and 23% to G2. Of the 11 positive samples from root canals, 82% were from G1 and 18% from G2. Production of proteinase presented a precipitation zone Pz<0.63 of 100% in G1 and 72% in G2, in redox and negative (Pz=1), under anaerobic conditions in both groups. Hydrophobicity of the strains from G1 indicated 16.4% with low, 19.3% with moderate, and 64.3% with high hydrophobicity in redox. In G2, 42.2% had low, 39.8% had moderate, 18% had high hydrophobicity in redox. In anaerobic conditions, G1 showed 15.2% with low, 12.8% with moderate, and 72% with high hydrophobicity; in G2, 33.6% had low, 28.8% had moderate, and 37.6% had high hydrophobicity. There was statistical difference in the number of positive cultures between G1 and G2 (p<0.05) with predominance in G1. There was statistical difference for all virulence factors, except hemolysis (p=0.001). Conclusions Candida albicans was isolated more frequently and had higher virulence in diabetic patients.
Descritores: Doenças Periodontais/microbiologia
Candida albicans/isolamento & purificação
Candida albicans/patogenicidade
Doenças da Polpa Dentária/microbiologia
Diabetes Mellitus Tipo 2/microbiologia
-Oxirredução
Peptídeo Hidrolases/análise
Doenças Periodontais/fisiopatologia
Doenças Periodontais/diagnóstico por imagem
Bolsa Periodontal/microbiologia
Fosfolipases/análise
Virulência
DNA Fúngico
Radiografia Dentária
Estudos de Casos e Controles
Reação em Cadeia da Polimerase
Estatísticas não Paramétricas
Cavidade Pulpar/microbiologia
Doenças da Polpa Dentária/fisiopatologia
Doenças da Polpa Dentária/diagnóstico por imagem
Diabetes Mellitus Tipo 2/fisiopatologia
Eletroforese
Interações Hidrofóbicas e Hidrofílicas
Limites: Seres Humanos
Masculino
Feminino
Adulto
Meia-Idade
Idoso
Responsável: BR1.1 - BIREME


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Id: biblio-1017075
Autor: Yu, Xiao-Chun; Ma, Shi-Liang; Xu, Yan; Fu, Cheng-Hao; Jiang, Chun-Ying; Zhou, Chen-Yu.
Título: Construction and application of a novel genetically engineered Aspergillus oryzae for expressing proteases
Fonte: Electron. j. biotechnol;29:32-38, sept. 2017. tab, ilus, graf.
Idioma: en.
Resumo: Background: We aimed to test the possibility of improving polypeptide production from soybean meal fermentation by engineered Aspergillus oryzae strains. Four different protease genes were cloned and transformed into wild-type A. oryzae, and the engineered A. oryzae strains were then used for soybean meal fermentation. Results: The results showed different degrees of improvement in the protease activity of the four transformants when compared with wild-type A. oryzae. A major improvement in the polypeptide yield was achieved when these strains were used in soybean meal fermentation. The polypeptide conversion rate of one of the four transformants, A. oryzae pep, reached 35.9%, which was approximately twofold higher than that exhibited by wild-type A. oryzae. Amino acid content analysis showed that the essential amino acid content and amino acid composition of the fermentation product significantly improved when engineered A. oryzae strains were used for soybean meal fermentation. Conclusions: These findings suggest that cloning of microbial protease genes with good physicochemical properties and expressing them in an ideal host such as A. oryzae is a novel strategy to enhance the value of soybean meal.
Descritores: Peptídeo Hidrolases/metabolismo
Aspergillus oryzae/enzimologia
Aspergillus oryzae/genética
-Peptídeo Hidrolases/genética
Feijão de Soja
Transformação Genética
Engenharia Genética
Clonagem Molecular
Fermentação
Farinha
Aminoácidos/análise
Responsável: CL1.1 - Biblioteca Central


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Cesar, Carlos Lenz
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Id: lil-601009
Autor: Fernandes, Heloise Pöckel; Cesar, Carlos Lenz; Barjas-Castro, Maria de Lourdes.
Título: Electrical properties of the red blood cell membrane and immunohematological investigation
Fonte: Rev. bras. hematol. hemoter;33(4):297-301, 2011. ilus, tab.
Idioma: en.
Resumo: Hemagglutination is widely used in transfusion medicine and depends on several factors including antigens, antibodies, electrical properties of red blood cells and the environment of the reaction. Intermolecular forces are involved in agglutination with cell clumping occurring when the aggregation force is greater than the force of repulsion. Repulsive force is generated by negative charges on the red blood cell surface that occur due to the presence of the carboxyl group of sialic acids in the cell membrane; these charges create a repulsive electric zeta potential between cells. In transfusion services, specific solutions are used to improve hemagglutination, including enzymes that reduce the negative charge of red blood cells, LISS which improves the binding of antibodies to antigens and macromolecules that decrease the distance between erythrocytes. The specificity and sensitivity of immunohematological reactions depend directly on the appropriate use of these solutions. Knowledge of the electrical properties of red blood cells and of the action of enhancement solutions can contribute to the immunohematology practice in transfusion services.
Descritores: Potencial zeta
Aglutinação
Eritrócitos
Pinças Ópticas
-Peptídeo Hidrolases
Dextranos
Tipo de Publ: Revisão
Responsável: BR408.1 - Biblioteca da Faculdade de Medicina - BFM


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Id: lil-686612
Autor: Cherifi, Fatah; Laraba-Djebari, Fatima.
Título: Isolated biomolecules of pharmacological interest in hemostasis from Cerastes cerastes venom
Fonte: J. venom. anim. toxins incl. trop. dis;19:11-11, maio 2013.
Idioma: en.
Resumo: Biomolecules from Cerastes cerastes venom have been purified and characterized. Two phospholipases isolated from Cerastes cerastes venom share 51% of homology. CC2-PLA2 exhibits antiplatelet activity that blocks coagulation. CCSV-MPase, a non-hemorrhagic Zn2+-metalloproteinase, significantly reduced the plasmatic fibrinogen level and hydrolyzes only its Bß chain. Serine proteinases such as RP34, afaâcytin and CC3-SPase hydrolyze the fibrinogen and are respectively α, αß and αß fibrinogenases. In deficient human plasma, afaâcytin replaces the missing factors VIII and IX, and activates purified human factor X into factor Xa. It releases serotonin from platelets and directly aggregates human (but not rabbit) blood platelets. RP34 proteinase also had no effect on both human and rabbit blood platelet aggregation. CC3-SPase revealed a pro-coagulant activity. However, the insolubility of the obtained clot indicates that CC3-SPase does not activate factor XIII. In addition, CC3-SPase clotting activity was carried out with human plasmas from volunteer patients deficient in clotting factors. Results showed that CC3-SPase shortens clotting time of plasma deficient in factors II and VII but with weaker clotting than normal plasma. The clotting time of plasma deficient in factor II is similar to that obtained with normal plasma; suggesting that CC3-SPase is able to replace both factors IIa and VII in the coagulation cascade and thus could be involved in the blood clotting process via an extrinsic pathway. These results imply that CC3-SPase and afaâcytin could repair hemostatic abnormalities and may replace some factors missing in pathological deficiency. Afaâcytin also exhibits α fibrinase property similar to a plasmin-like proteinase. Despite its thrombin-like characteristics, afaâcytin is not inhibited by plasmatic thrombin inhibitors. The procoagulant properties of afaâcytin might have potential clinical applications.(AU)
Descritores: Venenos de Víboras/isolamento & purificação
Viperidae/sangue
Hemostasia/fisiologia
-Peptídeo Hidrolases
Plaquetas/fisiologia
Metaloproteases
Fosfolipases A2
Tipo de Publ: Revisão
Responsável: BR33.1 - Divisão Técnica de Biblioteca e Documentação


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Id: biblio-1023133
Autor: Quiroz Mendes, Fabrícia Quiroz; De Almeida Oliveira, Maria Goreti; Brunoro Costa, Neuza Maria; Vieira Pires, Christiano; Regina Passos, Flávia.
Título: Capability of in vitro digestibility methods to predict in vivo digestibility of vegetal and animal proteins
Fonte: Arch. latinoam. nutr;66(1):5-16, mar. 2016. tab, graf.
Idioma: en.
Resumo: The purpose of this work was to establish predictive equations for the digestibility of proteins of animal and vegetal origin by correlating in vitro and in vivo methods. Proteins sources for animal and vegetable were used. To calculate in vitro digestibility, we used pH values obtained 10 min after a solution of enzymes was added to a protein solution (pH-drop method). We also used the pH-static method, which measures the volume of additional NaOH that is necessary to maintain a pH of 8.0 after the addition of an enzymatic solution. In vivo digestibility was measured in newly weaned male rats that were fed a diet of AIN-93G for growth with a modified protein content of 9.5% for 14 days. The equations developed using the pH-drop method allowed us to predict in vivo digestibility amounts that were more closely correlated with real in vivo digestibility than those obtained with equations using the pH-static method. In vitro techniques are less expensive, require less manpower and physical space, and use a smaller quantity of protein(AU)

O objetivo deste trabalho foi estabelecer equações de predição para a digestibilidade das proteínas de origem animal e vegetal, correlacionando métodos in vitro e in vivo. Foram utilizadas proteínas de origem animal e vegetal. Para o cálculo da digestibilidade in vitro foram utilizados os valores de pH obtidos em 10 min após a adição da solução de enzimas (método de queda de pH). Também foi utilizado o método de pH estático, o qual mede o volume de NaOH adicionado, necessário para manter o pH em 8,0 após a adição de uma solução enzimática. A digestibilidade in vivo foi medida em ratos machos recémdesmamados que foram alimentados com uma dieta AIN- 93G para crescimento com teor de proteína modificada de 9,5% durante 14 dias. As equações desenvolvidas utilizando o método de queda de pH permitiram prever em quantidades digestibilidade in vitro que foram mais estreitamente correlacionadas com a digestibilidade in vivo do que aqueles obtidas utilizando equações do método de pH estático. As técnicas in vitro são menos dispendiosas, exigem menos mão-de-obra e espaço físico, e utiliza uma menor quantidade de proteína(AU)
Descritores: Peptídeo Hidrolases/isolamento & purificação
Proteínas de Vegetais Comestíveis/análise
Técnicas In Vitro
Proteínas na Dieta/síntese química
-Análise Estatística
Ciclo do Nitrogênio
Limites: Seres Humanos
Masculino
Feminino
Tipo de Publ: Estudos de Avaliação
Responsável: VE557.1 - Biblioteca Fundación Bengoa



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BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde