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Viability of using enamel and dentin from bovine origin as a substitute for human counterparts in an intraoral erosion model

TURSSI, Cecilia Pedroso; MESSIAS, Danielle Furtado; CORONA, Silmara Milori; SERRA, Mônica Campos
Fonte: Fundação Odontológica de Ribeirão Preto Publicador: Fundação Odontológica de Ribeirão Preto
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.57%
This study ascertained whether under dental erosion models that closely mimics the real-life situation enamel and root dentin from bovine origin would be reliable substitutes for human counterparts. Through a 2x2 crossover design, in a first trial, 14 volunteers wore a palatal device containing slabs of bovine and human enamel. Half of the participants ingested (4x daily, for 10 days) orange juice first, crossing over to mineral water, while the remainder received the reverse sequence. In a second trial, volunteers wore devices with slabs of bovine and human root dentin. Except for the duration of each intraoral phase, which lasted 2 rather 10 days, the experiment with root dentin run exactly as for enamel. Dental substrates were analyzed for surface microhardness. Two-way ANOVAs (α=0.05) indicated no difference between the microhardness values recorded for human and bovine enamel (p=0.1350), but bovine root dentin had lower microhardness compared to its human counterpart (p=0.0432). While bovine enamel can reliably substitute its human counterpart in in situ dental erosion models, bovine root dentin does not seem to be a viable alternative to the corresponding human tissue.; Este estudo visou avaliar, sob um modelo de erosão dental que se aproxima da realidade clínica...

Activity of Matrix Metalloproteinases in Bovine versus Human Dentine

KATO, M. T.; HANNAS, A. R.; LEITE, A. L.; BOLANHO, A.; ZARELLA, B. L.; SANTOS, J.; CARRILHO, M.; TJADERHANE, L.; BUZALAF, M. A. R.
Fonte: KARGER Publicador: KARGER
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.57%
Metalloproteinases (MMPs) have been implicated with metabolism of collagen in physiological and pathological processes in human dentine. As bovine teeth have been used as a substitute for human teeth in laboratory analysis, this study evaluated the activity of MMP-2 and -9 in bovine versus human dentine. Bovine and human dentine fragments, from crowns and roots, were powderized. Protein extraction was performed by two protocols: a neutral extraction with guanidine-HCl/EDTA (pH 7.4) and an acidic extraction with citric acid (pH 2.3). Gelatinolytic activities of extracts were revealed by zymography. MMP-2 and -9 were detected in crown and root dentine from bovine and human teeth. Total activities of MMP-2 were 11.4 +/- 2.2, 14.6 +/- 2.0, 9.7 +/- 1.2 and 12.4 +/- 0.9 ng/ml for bovine root, human root, bovine crown and human crown dentine, respectively. Corresponding activities for MMP-9 were 14.9 +/- 2.0, 15.3 +/- 1.3, 15.4 +/- 1.3 and 15.5 +/- 1.3 ng/ml, respectively. Bovine dentine was found to be a reliable substrate for studies involving the activity of MMP-2 and -9. Copyright (C) 2011 S. Karger AG, Basel; FAPESP[07/08389-3]; FAPESP[07/04209-0]; FAPESP[08/09857-3]; FAPESP[07/54618-4]; CNPq[300615/2007-8]

Caracterização epidemiológica da brucelose bovina no Estado do Espírito Santo; Epidemiological characterization of bovine brucellosis in Espírito Santo State, Southeast region of Brazil

Azevedo, Sérgio Santos de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 23/06/2006 PT
Relevância na Pesquisa
36.57%
Foi conduzido um inquérito soroepidemiológico da brucelose bovina no Estado do Espírito Santo através de parceria firmada entre o Ministério da Agricultura, Pecuária e Abastecimento (MAPA), o Instituto de Defesa Agropecuária e Florestal do Estado do Espírito Santo (IDAF-ES) e o Departamento de Medicina Veterinária Preventiva e Saúde Animal (VPS) da Faculdade de Medicina Veterinária e Zootecnia (FMVZ) da Universidade de São Paulo (USP). O Estado foi dividido em dois estratos amostrais, conforme o tipo de exploração predominante e a capacidade operacional do IDAF-ES para a condução do trabalho de campo. A amostragem foi delineada para a determinação da prevalência de propriedades positivas (focos) e de animais soropositivos para a brucelose bovina por estrato amostral. Foi realizada uma seleção aleatória de 300 propriedades (unidades primárias) por estrato amostral, e dentro das unidades primárias, foram amostradas, aleatoriamente, 10 fêmeas bovinas com idade igual ou superior a 24 meses (unidades secundárias) quando o rebanho foi constituído por até 99 fêmeas da mesma faixa etária, ou todas as fêmeas existentes nessa faixa etária se não totalizassem 10 animais; quando o rebanho foi constituído por mais de 99 fêmeas com idade igual ou superior a 24 meses...

Componentes imunológicos do colostro bovino: células, teores de imunoglobulinas e atividade bactericida dos fagócitos para a Escherichia coli enterotoxigênica (ECET); Immunological components of bovine collostrum: cells, immunoglobulin content and bactericidal activity of phagocytes against enterotoxigenic Escherichia coli

Gomes, Viviani
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 10/03/2008 PT
Relevância na Pesquisa
36.62%
Estudou-se quantitativamente e qualitativamente a citologia, os teores de imunoglobulinas, e a atividade bactericida dos fagócitos do colostro bovino contra a Escherichia coli enterotoxigênica (ECET), analisando-se a influência da opsonização prévia destas células. Para tal finalidade foram utilizadas 53 vacas da raça Holandesa, das quais realizou-se a colheita de um total 212 amostras de colostro obtidas antes da primeira e segunda ordenha. As amostras positivas (n=41) ao exame bacteriológico do leite foram excluídas desta pesquisa. Para a análise citológica quantitativa e qualitativa do colostro, foram utilizadas as técnicas de microscopia direta e citocentrifugação, respectivamente. As dosagens das imunoglobulinas (IgG, IgM e IgA) foram realizadas por meio da técnica de imunodifusão radial, utilizando-se Kits comerciais. Para a avaliação da atividade bactericida indireta dos fagócitos e verificação da influência da opsonização prévia da ECET, foram realizados os seguintes ensaios: utilizando somente suspensão de fagócitos mononucleares e polimorfonucleares em meio de cultura (Grupo Controle - C); suspensão de fagócitos mononucleares e polimorfonucleares adicionados a suspensão de ECET não opsonizada (Grupo NO); suspensão de fagócitos mononucleares e polimorfonucleares adicionados a suspensão de ECET previamente opsonizada com 10% de sobrenadante de colostro bovino delipidado (Grupo O). A atividade bactericida indireta dos fagócitos foi mensurada por meio da quantidade de nmoles de peróxido de hidrogênio liberado por estas células...

Efeito da extrusão termoplástica nas características físico-químicas e nutricionais do rúmen bovino e sua aplicação na alimentação humana; Thermoplastic extrusion effects on physical-chemical and nutritional properties of bovine rumen and its application in human feed.

Silva, Ana Carolina Conti e
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 22/02/2008 PT
Relevância na Pesquisa
36.57%
Introdução. O rúmen bovino constitui um subproduto de abatedouro por ser rejeitado sensorialmente e culturalmente. Apesar disso, representa uma ótima fonte protéica, sendo desejável seu aproveitamento integral na alimentação humana. Objetivo geral. Desenvolver um produto à base de rúmen bovino, avaliando suas características físico-químicas e nutritivas e sua aplicação em alimentos. Metodologia. O rúmen bovino foi desengordurado a frio e extrusado em extrusora de rosca única. Utilizou-se a Metodologia de Superfície de Resposta para verificação dos efeitos da extrusão sobre as propriedades funcionais do rúmen: capacidade de retenção de água, capacidade de emulsificação, estabilidade da emulsão, solubilidade da proteína e hidrofobicidade da superfície protéica. Foi avaliada a composição nutritiva do rúmen (composição centesimal, colesterol, perfil de ácidos graxos e sua qualidade protéica através da composição de aminoácidos e digestibilidade real em ratos). Três produtos cárneos (lingüiça toscana, hambúrguer de frango e quibe) foram fabricados com extrusado ou com farinha de rúmen, analisados sensorialmente e comparados com produtos cárneos contendo extrusado de concentrado protéico de soja. Resultados. A capacidade de emulsificação...

Estudo comparativo in vitro das estruturas orgânicas e inorgânicas da dentina saudável e esclerosada humana e bovina: nanodureza, concentração de Ca e P e análise morfológica; In vitro comparative study of organic and inorganic components analysis of health and sclerotic human and bovine dentin: nanohardness, Ca and P concentration and morphological analysis

Castanho, Gisela Muassab
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 03/12/2010 PT
Relevância na Pesquisa
36.59%
A dentina esclerosada é um substrato comumente encontrado em pacientes idosos. No entanto, existem poucos estudos comparativos entre dentina humana e bovina esclerosadas. O objetivo deste estudo foi comparar os componentes inorgânicos e orgânicos da dentina saudável e esclerosada humana e bovina, através de cinco parâmetros: nanodureza, módulo de elasticidade, análise quantitativa da concentração de Cálcio (Ca) e Fósforo (P), densidade tubular e morfologia do colágeno. Trinta dentes humanos e 30 bovinos foram distribuídos em 4 grupos experimentais (n=15 por grupo): dentina humana saudável (DHS), esclerosada humana (DEH), bovina saudável (DBS), e bovina esclerosada (DBE). Os dentes saudáveis foram preparados na mesma altura e inclinação dos dentes esclerosados expondo níveis similares da dentina e obtendo fragmentos com 2mm de espessura. Foram realizadas 3 medições por espécime em 3 áreas pré determinadas de dentina intertubular com a utilização do Nanoindentador (carga de 500N por 5 s). Cinco espécimes de cada grupo foram preparados para Microscopia Eletrônica de Varredura (MEV). Com o auxílio da Energia Dispersiva por Raios-X EDX foram obtidos os valores (em percentagem) das concentrações de Ca e P e calculada a relação Ca:P. A contagem dos túbulos por área foi realizada em todas as eletromicrografias. Após descalcificação e preparo...

Situação epidemiológica da tuberculose bovina no Estado de Rondônia; Epidemiological situation of bovine tuberculosis in the State of Rondônia

Vendrame, Fabiano Benitez
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 16/08/2013 PT
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36.57%
Realizou-se um inquérito epidemiológico para estimar a prevalência da tuberculose bovina no Estado de Rondônia. O Estado foi estratificado em três circuitos produtores, e em cada um dos circuitos escolheu-se aleatoriamente as propriedades a serem visitadas, totalizando 904 propriedades e 19.640.animais amostrados. Um número pré-estabelecido de animais foram aleatoriamente escolhidos e submetidos ao teste cervical comparativo, de modo que em propriedades com até 100 fêmeas com idade superior a 24 meses, foram testadas 20 fêmeas ou menos e, em propriedades com mais de 100 fêmeas com idade superior a 24 meses, foram testadas 40 fêmeas. Foram considerados focos as propriedades com um animal reagente entre os 20 amostrados e nas propriedades com 40 fêmeas amostradas que tiveram dois animais reagentes. As prevalências de focos e animais para o Estado foram, respectivamente, 2,3% [1,5; 3,5] e 0,1% [0,1; 0,2], e para os circuitos pecuários foram: Circuito 1 (Norte-Oeste-Sul), 1,7% [0,7; 4,0] e 0,1% [0; 0,4], Circuito 2 (Nordeste), 3,0% [1,6; 5,7] e 0,2% [0,1; 0,3] e Circuito 3 (Sudeste), 2,3% [1,1; 4,7] e 0,1%[0; 0,2]. Além dos testes tuberculínicos, aplicou-se um questionário para levantamento dos fatores de risco para tuberculose bovina. As variáveis foram submetidas à analise univariada e aquelas que apresentaram p < 0...

Effect of capacitation of stallion sperm with polyvinylalcohol or bovine serum albumin on penetration of bovine zona-free or partially zona-removed equine oocytes

Choi, Y. H.; Landim-Alvarenga, F. C.; Seidel, G. E.; Squires, E. L.
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 2080-2087
ENG
Relevância na Pesquisa
36.67%
Experiments were conducted to study effects of macromolecules on stallion sperm capacitation and fertilization as determined by penetration of bovine zona-free and equine partially zona-removed oocytes. Stallion sperm were capacitated in TYH medium (modified Krebs-Ringer bicarbonate) supplemented with either 1 mg/mL of polyvinylalcohol (PVA) or 4 mg/ mL of BSA. Capacitation was induced with 8 bromoadenosine cyclic monophosphate (8BrcAMP; 0.5 mM) alone or in combination with 0.1 μM of ionomycin. Intraspecies gametes were co-incubated in TYH/PVA or TYH/ BSA for 18 to 20 h. For zona-free bovine oocytes, penetration rate (35%) with the combination of 8BrcAMP and ionomycin in PVA-containing medium was higher (P < 0.05) than any treatment in BSA-containing medium (5 to 6%). A similar study was conducted using equine oocytes with partially removed zonae. Sperm capacitated and used for in vitro fertilization (IVF) in PVA-containing medium had higher penetration rates (P < 0.01) than sperm in BSA-containing medium (54 vs. 11%). The effect of equine preovulatory follicular fluid on bovine oocyte penetration was assessed. Bovine oocytes were matured in tissue culture medium-199 with 0, 20, 50, or 100% equine preovulatory follicular fluid, and 1 IU/mL of equine chorionic gonadotropin. Stallion sperm were treated with 8BrcAMP + ionomycin in PVA- or BSA-containing media. The penetration rates of bovine zona-free oocytes by stallion sperm were again higher with PVA (47%) than BSA (18%; P < 0.01). Penetration rates of oocytes matured in 100% follicular fluid were higher (P < 0.05) than for oocytes matured with 0% follicular fluid. The effects of equine follicular fluid and PVA/BSA during sperm capacitation on standard bovine IVF were examined. Culture of bovine oocytes with equine follicular fluid did not affect oocyte maturation or penetration rates after IVF. Bovine sperm capacitated with heparin in PVA-containing medium yielded lower (P < 0.05) fertilization rates than those capacitated in BSA-containing medium when incubated with both zona-intact and zona-free bovine oocytes. In summary...

Occurrence of mycobacteria in bovine milk samples from both individual and collective bulk tanks at farms and informal markets in the southeast region of Sao Paulo, Brazil

Franco, Marília Masello Junqueira; Paes, Antonio Carlos; Ribeiro, Márcio Garcia; de Figueiredo Pantoja, José Carlos; Santos, Adolfo Carlos Barreto; Miyata, Marcelo; Leite, Clarice Queico Fujimura; Motta, Rodrigo Garcia; Listoni, Fernando José Paganini
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.57%
Background: Mycobacterium spp. is one of the most important species of zoonotic pathogens that can be transmitted from cattle to humans. The presence of these opportunistic, pathogenic bacteria in bovine milk has emerged as a public-health concern, especially among individuals who consume raw milk and related dairy products. To address this concern, the Brazilian control and eradication program focusing on bovine tuberculosis, was established in 2001. However, bovine tuberculosis continues to afflict approximately 1,3 percent of the cattle in Brazil. In the present study, 300 samples of milk from bovine herds, obtained from both individual and collective bulk tanks and informal points of sale, were cultured on Löwenstein-Jensen and Stonebrink media. Polymerase chain reaction (PCR)-based tests and restriction-enzyme pattern analysis were then performed on the colonies exhibiting phenotypes suggestive of Mycobacterium spp., which were characterized as acid-fast bacilli.Results: Of the 300 bovine milk samples that were processed, 24 were positively identified as Mycobacterium spp.Molecular identification detected 15 unique mycobacterial species: Mycobacterium bovis, M. gordonae, M. fortuitum, M. intracellulare, M. flavescens, M. duvalii...

Activity of Matrix Metalloproteinases in Bovine versus Human Dentine

KATO, M. T.; HANNAS, A. R.; LEITE, A. L.; BOLANHO, A.; ZARELLA, B. L.; SANTOS, J.; CARRILHO, M.; TJADERHANE, L.; BUZALAF, M. A. R.
Fonte: KARGER Publicador: KARGER
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
36.57%
Metalloproteinases (MMPs) have been implicated with metabolism of collagen in physiological and pathological processes in human dentine. As bovine teeth have been used as a substitute for human teeth in laboratory analysis, this study evaluated the activity of MMP-2 and -9 in bovine versus human dentine. Bovine and human dentine fragments, from crowns and roots, were powderized. Protein extraction was performed by two protocols: a neutral extraction with guanidine-HCl/EDTA (pH 7.4) and an acidic extraction with citric acid (pH 2.3). Gelatinolytic activities of extracts were revealed by zymography. MMP-2 and -9 were detected in crown and root dentine from bovine and human teeth. Total activities of MMP-2 were 11.4 +/- 2.2, 14.6 +/- 2.0, 9.7 +/- 1.2 and 12.4 +/- 0.9 ng/ml for bovine root, human root, bovine crown and human crown dentine, respectively. Corresponding activities for MMP-9 were 14.9 +/- 2.0, 15.3 +/- 1.3, 15.4 +/- 1.3 and 15.5 +/- 1.3 ng/ml, respectively. Bovine dentine was found to be a reliable substrate for studies involving the activity of MMP-2 and -9. Copyright (C) 2011 S. Karger AG, Basel; Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Concomitant infection of Neospora caninum and Bovine Herpesvirus type 5 in spontaneous bovine abortions

Marin,Maia S.; Morrell,Eleonora L.; Pérez,Sandra E.; Leunda,María R.; Moore,Dadín P.; Jones,Leandro R.; Campero,Carlos M.; Odeón,Anselmo C.
Fonte: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Publicador: Colégio Brasileiro de Patologia Animal - CBPA; Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/11/2013 EN
Relevância na Pesquisa
36.57%
Bovine Herpesvirus type 5 (BoHV-5) has not been conclusively demonstrated to cause bovine abortion. Brain lesions produced by Neospora caninum and Bovine Herpesvirus type 1 (BoHV-1) exhibit common features. Therefore, careful microscopic evaluation and additional diagnostic procedures are required to achieve an accurate final etiological diagnosis. The aim of the present work was to investigate the occurrence of infections due to BoHV-1, BoHV-5 and N. caninum in 68 cases of spontaneous bovine abortions which showed microscopic lesions in the fetal central nervous system. This study allowed the identification of 4 (5.9%) fetuses with dual infection by BoHV-5 and N. caninum and 33 (48.5%) cases in which N. caninum was the sole pathogen identified. All cases were negative to BoHV-1. The results of this study provide evidence that dual infection by BoHV-5 and N. caninum occur during pregnancy in cattle; however, the role of BoHV-5 as a primary cause of bovine abortion needs further research. Molecular diagnosis of BoHV-5 and N. caninum confirmed the importance of applying complementary assays to improve the sensitivity of diagnosing bovine abortion.

Isolation of bovine plasma albumin by liquid chromatography and its polymerization for use in immunohematology

Tanaka,K.; Sawatani,E.; Shigueoka,E.M.; Dias,G.A.; Nakao,H.C.; Arashiro,F.
Fonte: Associação Brasileira de Divulgação Científica Publicador: Associação Brasileira de Divulgação Científica
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2001 EN
Relevância na Pesquisa
36.57%
The aim of the method described here is to remove hemoglobin, the major contaminant in the bovine plasma obtained from slaughterhouses, by adding a mixture of 19% cold ethanol and 0.6% chloroform, followed by fibrinogen and globulin precipitation by the Cohn method and nonspecific hemagglutinin by thermocoagulation. The experimental volume of bovine plasma was 2,000 ml per batch. Final purification was performed by liquid chromatography using the ion-exchange gel DEAE-Sepharose FF. The bovine albumin thus obtained presented > or = 99% purity, a yield of 25.0 ± 1.2 g/l plasma and >71.5% recovery. N-acetyl-DL-tryptophan (0.04 mmol/g protein) and sodium caprylate (0.04 mmol/g protein) were used as stabilizers and the final concentration of albumin was adjusted to 22.0% (w/v), pH 7.2 to 7.3. Viral inactivation was performed by pasteurization for 10 h at 60°C. The bovine albumin for the hemagglutination tests used in immunohematology was submitted to chemical treatment with 0.06% (w/v) glutaraldehyde and 0.1% (w/v) formaldehyde at 37°C for 12 h to obtain polymerization. A change in molecular distribution was observed after this treatment, with average contents of 56.0% monomers, 23.6% dimers, 12.2% trimers and 8.2% polymers. The tests performed demonstrated that this polymerized albumin enhances the agglutination of Rho(D)-positive red cells by anti-Rho(D) serum...

Viability of using enamel and dentin from bovine origin as a substitute for human counterparts in an intraoral erosion model

Turssi,Cecilia Pedroso; Messias,Danielle Furtado; Corona,Silmara Milori; Serra,Mônica Campos
Fonte: Fundação Odontológica de Ribeirão Preto Publicador: Fundação Odontológica de Ribeirão Preto
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2010 EN
Relevância na Pesquisa
36.57%
This study ascertained whether under dental erosion models that closely mimics the real-life situation enamel and root dentin from bovine origin would be reliable substitutes for human counterparts. Through a 2x2 crossover design, in a first trial, 14 volunteers wore a palatal device containing slabs of bovine and human enamel. Half of the participants ingested (4x daily, for 10 days) orange juice first, crossing over to mineral water, while the remainder received the reverse sequence. In a second trial, volunteers wore devices with slabs of bovine and human root dentin. Except for the duration of each intraoral phase, which lasted 2 rather 10 days, the experiment with root dentin run exactly as for enamel. Dental substrates were analyzed for surface microhardness. Two-way ANOVAs (α=0.05) indicated no difference between the microhardness values recorded for human and bovine enamel (p=0.1350), but bovine root dentin had lower microhardness compared to its human counterpart (p=0.0432). While bovine enamel can reliably substitute its human counterpart in in situ dental erosion models, bovine root dentin does not seem to be a viable alternative to the corresponding human tissue.

Evaluation of the coefficient of thermal expansion of human and bovine dentin by thermomechanical analysis

Lopes,Murilo Baena; Yan,Zhuoqun; Consani,Simonides; Gonini Júnior,Alcides; Aleixo,Anderson; McCabe,John F.
Fonte: Fundação Odontológica de Ribeirão Preto Publicador: Fundação Odontológica de Ribeirão Preto
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2012 EN
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36.57%
The mismatch of thermal expansion and contraction between restorative materials and tooth may cause stresses at their interface, which may lead to microleakage. The present work compared the coefficient of thermal expansion (CTE) with the thermomechanical behavior of human and bovine teeth and determined if the CTE is a suitable parameter to describe tooth behavior. Fifteen human third molar and 15 bovine incisor tooth slices (6×5×2 mm) were allocated to 3 groups according to the test environment: G1 - room condition, G2 - 100% humidity, G3 - desiccated and tested in dry condition. Each specimen was weighed, heated from 20 to 70ºC at 10ºC min−1 and reweighed. The CTE was measured between 20 and 50ºC. Fresh dentin (human -0.49% ± 0.27, bovine -0.22% ± 0.16) contracted on heating under dry condition. Under wet conditions, only human teeth (-0.05% ± 0.04) showed contraction (bovine 0.00% ± 0.03) accompanied by a significantly lower (p<0.05) weight loss than in dry specimens (human 0.35% ± 0.15, bovine 0.45% ± 0.20). The desiccated dentin expanded on heating without obvious weight changes (0.00% ± 0.00). The CTE found was, respectively, in dry, wet and dissected conditions in ºC-1: human (-66.03×10-6, -6.82×10-6, 5.52×10-6) and bovine (-33.71×10-6...

THE EVALUATION OF CLOTTING TIME IN BOVINE THROMBIN, REPTILASE ® , AND THROMBIN-LIKE FRACTION OF Crotalus durissus terrificus VENOM USING BOVINE, EQUINE, OVINE, BUBALINE AND HUMAN CRYOPRECIPITATES

THOMAZINI-SANTOS,I. A.; GIANNINI,M. J. S. M.; TOSCANO,E.; MACHADO,P.E.A.; LIMA,C. R. G.; BARRAVIERA,B.
Fonte: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP Publicador: Centro de Estudos de Venenos e Animais Peçonhentos - CEVAP, Universidade Estadual Paulista - UNESP
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/1998 EN
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36.67%
The objective of this study was to evaluate the effects of the thrombin-like fraction of Crotalus durissus terrificus venom, Reptilase , and bovine thrombin of fibrinogen pools on bovine, equine, ovine, bubaline and human cryoprecipitates. The authors also made a comparative study between animal and human cryoprecipitates to see if any there was any possibility of future use in medicine. Fibrinogen levels in cryoprecipitate were studied using 48 blood samples obtained as follows:12 samples from humans, 9 from bovine, 10 from equine, 10 from ovine and 7 from bubaline. The results obtained showed average levels of 375.50 mg % for humans, 218.33 mg % for bovine, 240.80 mg % for equine, 267.70 mg % for ovine and 664.00 mg % for bubaline. Upon the formation of pools of human and animal fibrinogens, the following results were obtained: 435 mg % for humans, 444 mg % for bovine, 337 mg % for equine, 390 mg % for ovine and 530 mg % for bubaline. Statistical analysis (using the analysis of variance for entirely randomized experiment for the calculation of F statistics) demonstrated that the bubaline fibrinogen level was higher than that of human, and both were higher than those of ovine, equine...

Impairments of mecA gene detection in bovine Staphylococcus spp.

Melo,Dayanne Araújo de; Coelho,Irene da Silva; Motta,Cássia Couto da; Rojas,Anna Carolina Coelho Marín; Dubenczuk,Felipe Carlos; Coelho,Shana de Mattos de Oliveira; Souza,Miliane Moreira Soares de
Fonte: Sociedade Brasileira de Microbiologia Publicador: Sociedade Brasileira de Microbiologia
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2014 EN
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Staphylococcus aureus antimicrobial resistance, especially to beta-lactams, favors treatment failures and its persistence in herd environment. This work aimed to develop a more specific primer for mecA gene detection based on the comparison of the conserved regions from distinct host origins and also investigated the presence of homologue mecA LGA251 in bovine strains. A total of 43 Staphylococcus spp. were included in this study, comprising 38 bovine S. aureus, two human and three equine coagulase-negative staphylococci (CNS). Phenotypical methicillin-resistance detection was performed through oxacillin agar-screening and cefoxitin disk-diffusion test. None isolate tested positive for mecA LGA251 gene. For mecA gene PCR, new primers were designed based on the sequences of human S. aureus (HE681097) and bovine S. sciuri (AY820253) mecA. The new primers based on the S. aureus mecA sequence amplified fragments of human and equine CNS and the ones based on S. sciuri mecA sequence only yielded fragments for S. aureus bovine strains. Multiples alignments of mecA gene sequences from bovine, human and equine revealed punctual but significant differences in bovine strains that can lead to the mecA gene detection impairment. The observed divergences of mecA gene sequences are not a matter of animal or human origin...

Derivation, maintenance and characterization of bovine ES-like cells

Vassiliev, I.; McConnell, H.; Verma, P.
Fonte: Soc Study Reproduction Publicador: Soc Study Reproduction
Tipo: Artigo de Revista Científica
Publicado em //2005 EN
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The derivation and maintenance of ES cell lines from domestic species are important for a number of reasons. The most obvious are to facilitate manipulation of the genotype to produce animals for pharmaceutical or agricultural benefit, and to provide donor cells with an epigenetic profile similar to that of embryonic cells, aimed at improving cloning efficiency.Here we report on our attempts to obtain, maintain and characterize bovine ES-like cells. Three types of embryonal material from in vitro produced (IVP) blastocysts were investigated for isolation of bovine ES-like cells: 1) immunosurgically isolated ICM component of blastocysts, 2) blastocyst outgrowths from whole intact blastocysts and 3) blastocyst outgrowths developed from mechanically disrupted blastocysts. Embryonal outgrowths or parts thereof which demonstrated morphological criteria characteristic for ES cells were mechanically passaged onto fresh feeders. The resulting ES-like cell colonies were examined for presence of pluripotent markers using immunohistochemistry and RT-PCR. Bovine ES-like cells were successfully isolated and maintained in vitro for 6 passages. These cells retained morphology characteristic for bES cells: small cytoplasmic/nuclear ratio, nuclei with multiple nucleoli...

Expression of steroidogenic proteins and genes in bovine placenta from conventional and somatic cell nuclear transfer (SCNT) gestations

Verduzco Gomez, Adriana Rebeca
Fonte: Université de Montréal Publicador: Université de Montréal
Tipo: Thèse ou Mémoire numérique / Electronic Thesis or Dissertation
EN
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Pendant la grossesse, les hormones stéroïdes jouent un rôle indispensable dans la régulation des principales manifestations physiologiques telles que la reconnaissance maternelle de la gestation, la réceptivité de l'endomètre, le début du développement embryonnaire ainsi que le maintien de la gestation. Cependant, on sait très peu sur la production de ces hormones et les principaux facteurs des voies intracellulaires impliqués dans le processus de stéroïdogenèse dans le placenta bovin pendant les stades initiaux et plus avancés de la gestation. Par ailleurs, certaines anomalies du placenta chez les bovins suite à une mauvaise production de stéroïdes n'ont pas encore été démontrées. Les objectifs de cette thèse étaient donc de : 1) déterminer la présence et la localisation des principales protéines stéroïdiennes dans le placenta de bovins provenant de gestations de 50 à 120 jours, 2) comparer l'expression placentaire d'une série de gènes et de protéines stéroïdiennes entre une gestation impliquant un transfert de noyaux de cellules somatiques (SCNT) et une gestation non-clonale; 3) étudier l'impact des hormones trophiques et des seconds messagers sur la stéroïdogenèse dans le placenta bovin à 140 +10 jours de gestation. L’utilisation de techniques d’immunohistochimie...

Concomitant infection of Neospora caninum and Bovine Herpesvirus type 5 in spontaneous bovine abortions1

Marin, Maia Solange; Morrell, Eleonora Lidia; Perez, Sandra; Leunda, Maria R.; Moore, Dadin Prando; Jones, Leandro Roberto; Campero, Carlos Manuel; Odeon, Anselmo Carlos
Fonte: Revista Pesquisa Veterinaria Brasileira Publicador: Revista Pesquisa Veterinaria Brasileira
Tipo: info:eu-repo/semantics/article; info:ar-repo/semantics/artículo; info:eu-repo/semantics/publishedVersion Formato: application/pdf
ENG
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Bovine Herpesvirus type 5 (BoHV-5) has not been conclusively demonstrated to cause bovine abortion. Brain lesions produced by Neospora caninum and Bovine Herpesvirus type 1 (BoHV-1) exhibit common features. Therefore, careful microscopic evaluation and additional diagnostic procedures are required to achieve an accurate final etiological diagnosis. The aim of the present work was to investigate the occurrence of infections due to BoHV-1, BoHV-5 and N. caninum in 68 cases of spontaneous bovine abortions which showed microscopic lesions in the fetal central nervous system. This study allowed the identification of 4 (5.9%) fetuses with dual infection by BoHV-5 and N. caninum and 33 (48.5%) cases in which N. caninum was the sole pathogen identified. All cases were negative to BoHV-1. The results of this study provide evidence that dual infection by BoHV-5 and N. caninum occur during pregnancy in cattle; however, the role of BoHV-5 as a primary cause of bovine abortion needs further research. Molecular diagnosis of BoHV-5 and N. caninum confirmed the importance of applying complementary assays to improve the sensitivity of diagnosing bovine abortion.; Fil: Marin, Maia Solange. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires. Estación Experimental Agropecuaria Balcarce; Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina;; Fil: Morrell...

IMPACTO DO HERPESVÍRUS BOVINO 1 E DO VÍRUS DA DIARRÉIA VIRAL BOVINA NA TRANSFERÊNCIA DE EMBRIÕES; Bovine herpesvirus 1 and bovine viral diarrhea virus impact in the embryo transfer

RUFINO, F.A.; SENEDA, M.M.; ALFIERI, A.A.
Fonte: UFPR Publicador: UFPR
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 15/08/2006 POR
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A transferência de embriões bovinos é uma biotécnica da reprodução animal, amplamente difundida no Brasil, que tem possibilitado a produção de embriões com alto potencial genético. Considerando a difusão da técnica e o grande número de embriões gerados e distribuídos, no aspecto sanitário, devem ser avaliados os riscos da disseminação de agentes infecciosos da esfera reprodutiva. O herpesvírus bovino 1, responsável pela rinotraqueíte infecciosa bovina, e o vírus da diarréia viral bovina, causador da diarréia viral bovina, são dois vírus capazes de infectar embriões por meio das fêmeas doadoras e/ou do material biológico relacionado à técnica.; The bovine embryo transfer is an animal reproduction biotechnique widely diffused in Brazil that has been allowing the production of embryos with high genetic potential. Considering the technique diffusion and the high number of produced and distributed embryos, in the sanitary aspect its use in wide scale can contribute with risks of infectious diseases dissemination. Bovine herpesvirus 1 and bovine viral diarrhea virus, respectively, the etiological agents of the infectious bovine rhinotracheitis and bovine viral diarrhea are two potential viruses able to infect embryos through donator females and/or biological materials related to the technique.