oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 361 )

2018 ( 518 )

2017 ( 535 )

2016 ( 764 )

Custom range...

Search Results: 1 - 10 of 325534 matches for " Iveraldo S.;Kopp "
All listed articles are free for downloading (OA Articles)
Page 1 /325534
Display every page Item
Adherence and experimental infection of bacteria associated with periodontal infections of young cattle in Brazil ("Cara inchada")
Grassmann, Barbara;D?bereiner, Jürgen;Dutra, Iveraldo S.;Kopp, Peter A.;Blobel, Hans;
Pesquisa Veterinária Brasileira , 1997, DOI: 10.1590/S0100-736X1997000300006
Abstract: in vitro- and in vivo-assays were conducted, to study the possible role of streptomycin- and actinomycin-producing soil actinomycetes for the pathogenesis of "cara inchada" in cattle (ci). adherence of bacteroides spp. to epithelial cells of the bovine gingiva, known to be associated with the progressive lesions of ci, was significantly increased by the addition of streptomycin, actinomycin or antibiotic culture supernatants of the soil actinomycetes. applications of these mixtures together with actinomyces pyogenes to the marginal gingiva of the upper premolar teeth of about 1 month old holstein friesian calves did not lead to progressive lesions of ci. only one calf exhibited a slight diarrhea and a temporary retraction of the gingiva at the site of application.
Adherence and experimental infection of bacteria associated with periodontal infections of young cattle in Brazil ("Cara inchada")
Grassmann Barbara,D?bereiner Jürgen,Dutra Iveraldo S.,Kopp Peter A.
Pesquisa Veterinária Brasileira , 1997,
Abstract: In vitro- and in vivo-assays were conducted, to study the possible role of streptomycin- and actinomycin-producing soil actinomycetes for the pathogenesis of "Cara inchada" in cattle (CI). Adherence of Bacteroides spp. to epithelial cells of the bovine gingiva, known to be associated with the progressive lesions of CI, was significantly increased by the addition of streptomycin, actinomycin or antibiotic culture supernatants of the soil actinomycetes. Applications of these mixtures together with Actinomyces pyogenes to the marginal gingiva of the upper premolar teeth of about 1 month old Holstein Friesian calves did not lead to progressive lesions of CI. Only one calf exhibited a slight diarrhea and a temporary retraction of the gingiva at the site of application.
Public Health Burden of Chronic Stress in a Transforming Society
Mária S. Kopp
Psychological Topics , 2007,
Abstract: In this paper chronic stress is proposed as an integrating model that can be applied to the explanation of the suddenly changing patterns of premature mortality rates in transforming societies of Central-Eastern-Europe, especially in Hungary. The temporal factor in existing stress models is often neglected. Chronic stress has been shown to lead to typical pathogenetic results in animal experiments. Literature and the different models in the field of psychology, behavioural sciences, and epidemiology are reviewed in terms of the chronic stress theory. There are several conceptual bridges between psychological alterations and the risks, onset and prognosis of chronic disorders of great epidemiological significance. Depending on the field of research there are several parallel concepts which analyse practically the same phenomena. These are the stress theories in physiology, learned helplessness and control theory in psychology, depression research in psychiatry, the concept of vital exhaustion and the psychosocial risk research in sociology. Because chronic stress results in adverse health effects through biological, social and behavioural pathways, this theory might also havethe best explanatory power to understand the premature male morbidity and mortality crisis in Central and Eastern Europe in the last decades. The special features of premature mortality and morbidity crisis in Hungary might be regarded as an experimental model to understand better the human consequences of chronic stress and those processes where psychology meets physiology.
Dalitz Analysis of the Decay $D^{0}\to K^{-}π^{+}π^{0}$
S. Kopp,CLEO Collaboration
Physics , 2000, DOI: 10.1103/PhysRevD.63.092001
Abstract: We use data collected with the CLEO II detector to perform a high-statistics measurement of the resonant substructure in $D^0 \to K^-\pi^+\pi^0$ decays. We find the Dalitz Plot is well represented by a combination of seven quasi-two-body decay channels ($\bar{K}^{*0} \pi^0$, $K^- \rho$, $K^{*-} \pi^+$, $K^*_0(1430)^-\pi^+$, $\bar{K}^*_0(1430)^0 \pi^0$, $K^- \rho^+(1700)$, and $K^*(1680)^- \pi^+$), plus a small non-resonant component. Using the amplitudes and phases from this analysis, we calculate an integrated CP asymmetry of $-0.031 \pm 0.086$.
Sensibilidade toxicológica e especificidade do teste de microfixa??o de complemento na detec??o de toxinas botulínicas C e D em meio de cultura e fígado de camundongos
Menegucci, Edna A.;Dutra, Iveraldo S.;D?bereiner, Jürgen;
Pesquisa Veterinária Brasileira , 1998, DOI: 10.1590/S0100-736X1998000200001
Abstract: the toxicological sensitivity and specificity of the micro-complement fixation test (mcf) for the detection of botulinum toxins c and d were studied in supernatants of the bacterial cultures and in livers of mice inoculated with lethal and sublethal doses. botulinum toxins c and d were produced in hemoline culture medium, titered through the determination of ld50 by the mouse test and adjusted to dilutions of 10, 1, 0.1, 0.01 and 0.001 ld50. two experimental models were used to determine the toxicological sensitivity of mcf in the supernatant of the culture medium with the dilutions described, and also in liver extracts of mice weighing 20 g and inoculated with the same dilutions. detection of the botulinum toxins was attempted in liver extracts of mice which had received lethal doses of the respective toxins, and in others which had been inoculated with sublethal doses and were sacrificed in intervals of 5 days. the results show that the toxicological sensitivity of mcf, regarding the two types of toxins at the level of 0.001 ld50, was 100% when the supernatants of the culture medium were tested; this means that the sensitivity was 100 times higher than with the mouse test. the toxicological sensitivity of mcf in the liver extracts of mice inoculated with 1 and 10 ld50 of botulinum toxins c and d was inferior, giving values of 100, 80, 89 and 72% respectively. by this test it was also possible to detect botulinum toxins type c and d in liver extracts of mice inoculated with sublethal doses, up to 15 days after the injection. the specificity of mcf was 88% and 92%, when liver extracts of healthy control mice were tested and when challenged with antitoxins c and d; and 100% when challenged with the supernatant of the culture medium. these results indicate that mcf could be of importance for research and could substitute in vivo tests.
Botulismo em bovinos de corte e leite alimentados com cama de frango
Dutra, Iveraldo S.;D?bereiner, Jürgen;Souza, Aires M.;
Pesquisa Veterinária Brasileira , 2005, DOI: 10.1590/S0100-736X2005000200009
Abstract: outbreaks of botulism caused by type c and d of the botulinum toxin are frequent in brazil, and are associated with bone chewing and ingestion of contaminated food and water. this paper reports the epidemiological, clinical, pathological and laboratorial aspects of 7 outbreaks of botulism in beef and dairy cattle fed with poultry litter, which occurred in the states of s?o paulo and minas gerais, 1989-2000. five outbreaks occurred in beef cattle herds, raised in confinement or under pasture conditions and supplemented with poultry litter, and 2 outbreaks occurred in dairy farms. from o total of 1,535 cattle supplemented regularily with poultry litter 455 animals (29.64%) died within 2 to 4 weeks. morbidity and mortality varied from 3.47 to 100% in the 7 outbreaks. in one of the farms the lethality was 60.52%, and in others more than 88.43%, reaching 100% in three farms. clinical signs were progressive paralysis, difficulties in moving, decubitus, normal alertness, decreased muscular tonus of tongue and tail, sialorrhoe and dyspnoe. at post-mortem examination of 30 cattle no noteable changes were observed. spores of clostridium botulinum were found in poultry litter samples collected on 7 farms. in liver, ruminal and intestinal fluid samples from 30 necropsied cattle botulinum toxin of type c (5) and d (9) or of the cd complex (1) were found in at least one of the samples collected from 15 animals, which confirms the clincial, pathological and epidemiological diagnosis of botulism.
Sensibilidade toxicológica e especificidade do teste de microfixa o de complemento na detec o de toxinas botulínicas C e D em meio de cultura e fígado de camundongos
Menegucci Edna A.,Dutra Iveraldo S.,D?bereiner Jürgen
Pesquisa Veterinária Brasileira , 1998,
Abstract: No presente estudo pretendeu-se verificar a sensibilidade toxicológica e especificidade do Teste de Microfixa o de Complemento (MCF) na detec o de toxinas botulínicas C e D no sobrenadante de cultivos bacterianos e em fígados de camundongos inoculados com doses letais e subletais. As toxinas foram produzidas em meio de cultura Hemoline, tituladas através da determina o da DL50 pelo Bioensaio em Camundongo e diluídas nas concentra es de 10, 1, 0,1, 0,01 e 0,001 DL50. Desta forma, foram utilizadas em dois modelos experimentais, onde foi determinada a sensibilidade toxicológica do MCF no sobrenadante do meio de cultura com as dilui es descritas acima e ainda em extratos hepáticos de camundongos com peso corporal de 20g, inoculados com as mesmas dilui es. A tentativa de evidencia o das toxinas botulínicas nos extratos hepáticos de camundongos foi realizada através da sua extra o após a morte pela administra o das doses letais e ainda pelo sacrifício dos animais inoculados com doses subletais, em intervalos de 5 dias. Os resultados evidenciaram uma sensibilidade toxicológica para o MCF de 100% para os dois tipos de toxinas ao nível de 0,01 DL50, quando testados os sobrenadantes de meio de cultura, portanto 100 vezes superior ao Bioensaio em Camundongo. A sensibilidade toxicológica do MCF, quando examinados extratos hepáticos de camundongos inoculados com 1 e 10 DL50 de toxinas botulínicas C e D, foi inferior, com valores de 100, 80, 89 e 72%, respectivamente. Pelo teste foi possível detectar toxinas botulínicas tipos C e D nos extratos hepáticos de camundongos inoculados com doses subletais até 15 dias após a sua inocula o. A especificidade do MCF foi de 88 e 92%, quando testados extratos hepáticos de camundongos sadios, e confrontados com as antitoxinas C e D; e 100% no sobrenadante do meio de cultura. Os resultados apontam para uma possível utiliza o do teste como importante instrumento de pesquisa e ainda na eventual substitui o dos testes in vivo pelas suas implica es éticas e limita es práticas.
Jordan-Wigner approach to dynamic correlations in spin-ladders
Tamara S. Nunner,Thilo Kopp
Physics , 2002, DOI: 10.1103/PhysRevB.69.104419
Abstract: We present a method for studying the excitations of low-dimensional quantum spin systems based on the Jordan-Wigner transformation. Using an extended RPA-scheme we calculate the correlation function of neighboring spin flips which well approximates the optical conductivity of ${\rm Sr_2CuO_3}$. We extend this approach to the two-leg $S=1/2$--ladder by numbering the spin operators in a meander-like sequence. We obtain good agreement with the optical conductivity of the spin ladder compound (La,Ca)$_{14}$Cu$_{24}$O$_{41}$ for polarization along the rungs. For polarization along the legs higher order correlations are important to explain the weight of high-energy continuum excitations and we estimate the contribution of 4-- and 6--fermion processes.
Experimentos em bovinos com as favas de Enterolobium contortisiliquum e E. timbouva para verificar propriedades fotossensibilizantes e/ou abortivas
Tokarnia Carlos Hubinger,D?bereiner Jürgen,Dutra Iveraldo S.,Brito Ilson S.
Pesquisa Veterinária Brasileira , 1999,
Abstract: Em fun o de históricos obtidos, no presente estudo tentou-se reproduzir, em bovinos, fotossensibiliza o e/ou aborto com as favas de Enterolobium spp (Leg. Mimosoi-deae). As favas de E. contortisiliquum e E. timbouva ("tamboril" ou "timbaúba"), de diversas procedências, inclusive as colhidas durante dois surtos de intoxica o caracterizados por fotossensibliliza o e aborto, foram administradas em doses únicas e repetidas, a bovinos jovens e a vacas em gesta o. Em todos os experimentos realizados, a resposta à ingest o das favas independentemente da procedência, sempre foi caracterizada por diarréia e diminui o do apetite, passageiras. Também ficou evidente que os animais mostram menor sensibilidade, à medida que ingerem as favas seguidamente. Os experimentos n o revelaram possíveis fatores envolvidos ou eventuais condi es necessárias para que as favas de Enterolobium contortisiliquum e E. timbouva causem fotossen-sibliza o e/ou aborto.
Modifica??o da microbiota associada às les?es peridentárias da "cara inchada" em bezerros transferidos para área indene
Dutra, Iveraldo S.;Botteon, Rita C.M.;D?bereiner, Jürgen;
Pesquisa Veterinária Brasileira , 2000, DOI: 10.1590/S0100-736X2000000200003
Abstract: observations on the epizootiology of "cara inchada" in cattle (ci) indicated that animals affected by the disease recover spontaneously when they are transferred from the ci-prone area to ci-free pastures. in the presente study 13 young bovines with actively progressing periodontal ci-lesions were transferred to a ci-free area, in order to investigate the clinical course of the disease and the composition of the microflora in the periodontal lesions in two distinct situations: (1) in the actively progressing lesions, and (2) in the healed periodontal pouches of clinically recovered animals. the semi-quantitative and qualitative bacteriological study was undertaken in regard to the percentage of black-pigmented bacteroides in cultures. in the actively progressing lesions of the 13 ci-diseased bovines the percentage of these bacteria was 71.3% in average. the evaluation of the composition of the microflora in the healed periodontal pouches of the clinically recovered bovines showed that bacteria of the black-pigmented bacteroides group existed only at an average of 1.7%. the results of this investigation give further support for the infectious nature of the ci-periodontitis and the primary involvement of these bacteria.
Page 1 /325534
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.