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Search Results: 1 - 10 of 308522 matches for " Dercino F.;D?bereiner "
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Esporos e toxinas de Clostridium botulinum dos tipos C e D em cacimbas no Vale do Araguaia, Goiás
Souza, Aires M.;Marques, Dercino F.;Dbereiner, Jürgen;Dutra, Iveraldo S.;
Pesquisa Veterinária Brasileira , 2006, DOI: 10.1590/S0100-736X2006000300001
Abstract: the occurrence and distribution of clostridium botulinum spores and toxins type c and d in 300 ponds, used by cattle for drinking on 130 farms located in 12 municipalities of the rio araguaia valley, state of goiás, brazil, was evaluated. the presence of spores was determined indirectly by cultivation in culture medium, followed by inoculation and neutralization in mice of samples of the sediment from the bottom of the raining ponds, from superficial soil and from cattle feces collected to its circuit. the toxin presence was evaluated directly by inoculation in mice of the filtered sediment of the ponds, followed by the neutralization in mice with antitoxins c and d. the presence of c. botulinum spores was significantly more frequent (p<0,05) in the cattle feces (31%), when compared with the results of the superficial soil samples (19%) and the sediments (10%). botulinum toxins of type c and d or classified as belonging to the cd compound were detected in 6 samples (2%) of the 300 ponds. of the 130 worked farms, in 122 (93,85%) ponds clostridium botulinum spores or toxins were found in at least one of the researched variables, whilst ponds on only 8 (6,15%) farms did not present any contamination. age and depth of the ponds were associated with the frequency of detection of botulinum spores and toxins. the older and shallower the ponds were, the larger was the frequency of isolation of the spores and toxins. the contamination of the ponds in the araguaia valley with clostridium botulinum spores and toxins type c and d demonstrates the permanent and growing potential risk for the occurrence of botulism in cattle through drinking water.
Esporos e toxinas de Clostridium botulinum dos tipos C e D em cacimbas no Vale do Araguaia, Goiás
Souza Aires M.,Marques Dercino F.,Dbereiner Jürgen,Dutra Iveraldo S.
Pesquisa Veterinária Brasileira , 2006,
Abstract: Foram avaliadas a ocorrência e distribui o de esporos e toxinas de Clostridium botulinum tipos C e D em 300 cacimbas empregadas como bebedouro de bovinos em 130 propriedades rurais localizadas em 12 municípios do Vale do Araguaia, Estado de Goiás. A presen a de esporos foi determinada indiretamente pelo cultivo em meio de cultura, seguido da inocula o e neutraliza o em camundongo das amostras de sedimento do interior das cacimbas, e do solo superficial e fezes de bovinos, coletadas ao seu redor. A presen a de toxina foi avaliada diretamente pela inocula o em camundongo do sedimento filtrado das cacimbas, também seguida da neutraliza o em camundongo com antitoxinas C e D. A presen a de esporos de C. botulinum foi significativamente maior (p<0,05) nas fezes de bovinos (31%), quando comparadas com os resultados das amostras de solo superficial (19%) e dos sedimentos (10%). Foram detectadas toxinas botulínicas dos tipos C, D, ou classificadas como pertencentes ao complexo CD, em seis amostras (2%) das 300 cacimbas. Das 130 propriedades trabalhadas, em 122(93,85%) foram encontrados esporos ou toxinas de Clostridium botulinum em pelo menos uma das variáveis pesquisadas, enquanto somente 8(6,15%) n o apresentaram qualquer contamina o A idade e profundidade das cacimbas estiveram associadas com a freqüência de detec o de esporos e toxinas. Assim, quanto mais velhas e rasas, maior a freqüência do isolamento de esporos e toxinas. A contamina o das cacimbas do Vale do Araguaia goiano com esporos e toxinas do Clostridium botulinum tipos C e D demonstra o risco potencial permanente e crescente para a ocorrência da intoxica o botulínica de origem hídrica nos bovinos.
Rela??o entre macrófagos espumosos ("foam cells") no fígado de bovinos e ingest?o de Brachiaria spp no Brasil
Driemeier, David;Dbereiner, Jürgen;Peixoto, Paulo Vargas;Brito, Marilene F.;
Pesquisa Veterinária Brasileira , 1999, DOI: 10.1590/S0100-736X1999000200005
Abstract: to establish the etiological relationship and the appearance of foamy macrophages in the liver of cattle from tropical regions of brazil, liver samples from the files of the pathology section of embrapa-projeto sanidade animal, rio de janeiro, were reviewed. a total of 55 liver samples of cattle which died from different causes between 1970 and 1991 were reexamined. only samples of animals which grazed known pastures were reviewed. foamy macrophages were not seen in the samples from 1970 to 1975, although 40 samples (72%) were from this period. foamy macrophages were observed from 1976 on, coinciding with the introduction of brachiaria decumbens from australian seeds into brazil. some samples were from cattle with histories of photosensitization, which were at that time attributed to pithomyces chartarum. the results of this study indicate that the liver changes are related to prolonged ingestion of brachiaria spp.
Rela o entre macrófagos espumosos ("foam cells") no fígado de bovinos e ingest o de Brachiaria spp no Brasil
Driemeier David,Dbereiner Jürgen,Peixoto Paulo Vargas,Brito Marilene F.
Pesquisa Veterinária Brasileira , 1999,
Abstract: Com o objetivo de estabelecer uma rela o etiológica e caracterizar, cronologicamente, o aparecimento de macrófagos espumosos (foam cells), comuns em fígados de bovinos oriundos das regi es de clima tropical do Brasil, foram reexaminados cortes histológicos de fígado de bovinos dos arquivos do Setor de Anatomia Patológica da Embrapa-Projeto Sanidade Animal, RJ. O material utilizado provinha de investiga es sobre causas de mortandades em bovinos nas regi es Norte, Centro-Oeste e Sudeste do Brasil, realizadas de 1970 a 1991. Foram estudados 55 fígados de bovinos afetados por enfermidades variadas. Somente foram usados casos em que o tipo de pastagem era conhecido. Essa altera o n o foi encontrada de 1970 até o final de 1975, embora 40 amostras (72,7%) tenham sido coletadas nesse período. A presen a de macrófagos espumosos, observada a partir de 1976, coincidiu com a introdu o da gramínea Brachiaria decumbens var. australiana no Brasil. Algumas amostras eram provenientes de bovinos que apresentaram histórico de fotossensibiliza o, na época atribuída ao fungo Pithomyces chartarum. Os achados indicam que essas altera es hepáticas s o relacionadas com a ingest o de Brachiaria spp.
Ocorrência de bactérias diazotróficas em diferentes genótipos de cana-de-a?úcar
REIS JUNIOR, FáBIO BUENO DOS;SILVA, LUCIA GRACINDA DA;REIS, VER?NICA MASSENA;DBEREINER, JOHANNA;
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000000500016
Abstract: the objective of this work was to find out the localization and number of endophytic bacteria in four sugar cane genotypes and investigate upon the possible existence of correlation to the results obtained in some studies about quantification of biological nitrogen fixation (bnf). a survey of the diazotrophic bacteria present in sugar cane genotypes differing in their capacity to obtain nitrogen through bnf was performed, and population of herbaspirillum spp. and acetobacter diazotrophicus was quantified. the bacteria tested in the survey were azospirillum lipoferum, a. brasilense, a. amazonense, herbaspirillum spp. and acetobacter diazotrophicus. all these bacteria were present in the four genotypes and were found in all parts of the plants, except a. amazonense which was not isolated from leaf samples. the quantification of herbaspirillum spp. and a. diazotrophicus showed that there were no significant differences among the sugar cane genotypes and, generally, the bacteria were in greater number in roots. while number of herbaspirillum spp. remained stable during the life-cycle of the culture, the population of a. diazotrophicus suffer a decrease with the approach of the end of the commercial cycle. it is suggested that the differences in the rates of bnf found in sugar cane genotypes are not caused by differences in the presence or the number of the bacterial species studied here.
Ocorrência de bactérias diazotróficas em diferentes genótipos de cana-de-a úcar
REIS JUNIOR FáBIO BUENO DOS,SILVA LUCIA GRACINDA DA,REIS VER?NICA MASSENA,DBEREINER JOHANNA
Pesquisa Agropecuária Brasileira , 2000,
Abstract: O objetivo deste trabalho foi avaliar a localiza o e o número de bactérias endofíticas em quatro genótipos de cana-de-a úcar e investigar sobre a possível existência de correla o com os resultados apresentados em trabalhos de quantifica o da fixa o biológica de nitrogênio (FBN). Fez-se um levantamento das bactérias diazotróficas presentes, e quantificou-se a popula o de Herbaspirillum spp. e Acetobacter diazotrophicus, em genótipos de cana-de-a úcar contrastantes quanto à capacidade de obter N da FBN. De acordo com o levantamento realizado neste trabalho, as bactérias estudadas (Azospirillum lipoferum, A. brasilense, A. amazonense, Herbaspirillum spp. e Acetobacter diazotrophicus) estavam presentes nos quatro genótipos avaliados e em todas as partes da planta, exceto A. amazonense, que n o foi isolado de amostras de folhas. A quantifica o das bactérias Herbaspirillum spp. e A. diazotrophicus mostrou n o haver diferen as significativas entre os genótipos, e que, geralmente, elas est o presentes em maior número nas raízes. Enquanto Herbaspirillum spp. mantém-se mais estável ao longo do ciclo da cultura, a popula o de A. diazotrophicus decresce com a aproxima o do final do ciclo comercial. Pode-se sugerir que as diferen as entre as taxas de FBN encontradas nos diversos genótipos n o é causada por diferen as na presen a ou no número das bactérias aqui estudadas.
Are alveolar bone changes a determinant factor for "cara inchada" in cattle?
Dbereiner, Jürgen;D?mmrich, Klaus;
Pesquisa Veterinária Brasileira , 1997, DOI: 10.1590/S0100-736X1997000200001
Abstract: in order to study possible alterations of the skeleton which might play a role in the pathogenesis of the periodontitis of "cara inchada" in young cattle, ribs from 20 affected calves, 2 to 10 months old, were examined. electrolytically decalcified longitudinal sections of the costochondral junction and cross sections through the corpus costae, stained with haematoxylin-eosin, were studied. in five calves, longitudinal sections of the proximal humerus were examined as well. the status of mineralization was checked by microradiograms. systemic alteration of the skeleton due to disturbances of mineral metabolism could not be shown in any of the animals. in seven 2 to 4 months old calves, no bone changes were found. the reduced osteogenesis in six 3 to 5 months old calves and the reduced osteogenesis and diminished chondral growth in seven 5 to 10 months old calves are therefore a consequence of the disease. the results show that the development of the alveolar bone was not defective, so this cannot be a determinant factor for the development of the periodontitis of "cara inchada" in cattle.
Are alveolar bone changes a determinant factor for "cara inchada" in cattle?
Dbereiner Jürgen,D?mmrich Klaus
Pesquisa Veterinária Brasileira , 1997,
Abstract: In order to study possible alterations of the skeleton which might play a role in the pathogenesis of the periodontitis of "cara inchada" in young cattle, ribs from 20 affected calves, 2 to 10 months old, were examined. Electrolytically decalcified longitudinal sections of the costochondral junction and cross sections through the corpus costae, stained with Haematoxylin-Eosin, were studied. In five calves, longitudinal sections of the proximal humerus were examined as well. The status of mineralization was checked by microradiograms. Systemic alteration of the skeleton due to disturbances of mineral metabolism could not be shown in any of the animals. In seven 2 to 4 months old calves, no bone changes were found. The reduced osteogenesis in six 3 to 5 months old calves and the reduced osteogenesis and diminished chondral growth in seven 5 to 10 months old calves are therefore a consequence of the disease. The results show that the development of the alveolar bone was not defective, so this cannot be a determinant factor for the development of the periodontitis of "cara inchada" in cattle.
Sobre o "ronca", doen?a de etiologia obscura em bovinos, caracterizada por respira??o ruidosa
Tokarnia, Carlos Hubinger;Dbereiner, Jürgen;
Pesquisa Veterinária Brasileira , 1998, DOI: 10.1590/S0100-736X1998000300001
Abstract: "ronca", a disease of cattle occurring in the states of piauí, rio de janeiro and mato grosso do sul, is also known by the popular names "roncadeira" or "ronqueira", what means snoaring disease. data on the disease were obtained through informations, own observations, clinical and postmortem examinations of 12 affected bovines, completed by histopathological examinations and chemical analyses of liver samples for microelements. the main symptoms are the snoaring sound during inspiration, which arises or is intensified the more one leades with the animal, irritability, continuous worsening of the nutritional state and death after a few months up to 2 years. blood examinations, performed during the studies in piauí, showed a normocytic and hypocromic condition; blood smears did not reveal any abnormality. at postmortem examination sometimes an orange discolouration of the liver and an orange-brown colour of the lymphnodes of the liver hilus was observed. careful examinations of the nasal cavity, especially of the turbinates, and of the larynx did not disclose any lesions. histopathological examinations revealed, as the main lesion, severe hemosiderosis of the liver, always seen, as well as of the spleen and lymphnodes. chemical analyses of liver samples revealed in all by "ronca" affected animals of the three regions very low copper and very high iron values. two bovines affected by "ronca" and transferred to a region where the disease does not occur, continued with the snoaring respiration during more than a year. at postmortem examination no lesions besides a few not related to the disease were found. histopathological examinations revealed hemosiderosis in liver, spleen and lymphnodes, but less pronounced than in the animals affected by "ronca" which stayed at the original farm. chemical anlyses of the liver samples of the two transferred animals revealed normal values for copper and high levels of iron, but these were lower than those found in the animals affected
IMUNIDADE CRUZADA PELAS SEMENTES DE Abrus precatorius E Ricinus communis EM BOVINOS
Tokarnia, Carlos Hubinger;Dbereiner, Jürgen;
Pesquisa Veterinária Brasileira , 1997, DOI: 10.1590/S0100-736X1997000100005
Abstract: five bovines immunized against the toxicity of the seeds of abrus precatorius l. (jequiriti bean) did not get poisoned or only slightly so when the seeds of ricinus communis l. (castor bean) were given in amounts that in bovines, which never before ingested the seeds of a. precatorius or r. communis, caused moderate to severe poisoning or even death. a sixth bovine, which was not well immunized against the toxic action of the seeds of a. precatorius, was severely poisoned when given a high dose of the seeds of r. communis. on the other side, from five bovines immunized against the toxic action of the seeds of r. communis four were severely poisoned and the fifth one moderately when the seeds of a. precatorius were given in doses that in bovines, which never before ingested seeds of r. communis or a. precatorius, caused slight to severe poisoning. it is concluded that bovines immunized against the toxic action of the seeds of a. precatorius are resistant to the toxic action of the seeds of r. communis, but that the contrary is not the case; this is, bovines immunized against the toxic action of the seeds of r. communis were not protected against the poisoning by a. precatorius. earlier studies by other authors had shown that the toxalbumins of the seeds of a. precatorius and r. communis, respectively abrin and ricin, are different as to their antigenic properties. a possible explanation for the difference in results can be.that in the present study polygastric animals were used which received the seeds orally, but in the earlier studies monogastric animals received the seeds or toxins by parenteral route. the administration of the fresh leaves or the pericarp of the fruits r. communis to bovines, which had been immunized against the action of the seeds of the plant, had the same toxic effect as to not immunized animals, showing that the immunity due to ricin does not give protection against the action of ricinin, the toxic principle of the leaves and the pericarp.
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