42 research outputs found
Species and biotype distribution of thermotolerant Campylobacters in animal reservoirs in Southern Chile
Flora fanerogâmica da Serra Negra, Minas Gerais, Brasil
O presente estudo teve como objetivo caracterizar a flora fanerogâmica da região da Serra Negra localizada no sul da Zona da Mata de Minas Gerais, entre os municípios de Lima Duarte, Rio Preto, Santa Bárbara do Monte Verde e Olaria. Embora considerada de importância biológica alta, esta região não possui nenhum registro anterior de dados florísticos, o que levou ao desenvolvimento deste levantamento, durante o período de 2003 a 2010. A vegetação é caracterizada por um mosaico de formações florestais e campestres onde se destacam os campos rupestres e florestas nebulares em altitudes que variam de 1300 a ca. 1700 m. Um total de 1033 espécies foi encontrado, distribuídas em 469 gêneros e 121 famílias sendo as mais representativas Orchidaceae (115 spp.), Asteraceae 54 spp.), Melastomataceae (56 spp.), Myrtaceae (53 spp.), Fabaceae, Poaceae e Rubiaceae (48 spp. cada), Bromeliaceae (43 spp.), Solanaceae (38 spp.) e Piperaceae (33 spp). Novos registros e endemismos para a flora mineira foram encontrados e 58 espécies estão citadas na lista de espécies ameaçadas de Minas Gerais
Molecular response of gastric epithelial cells to Helicobacter pylori-induced cell damage
Campylobacter intestinal carriage among stray and pet dogs Disseminação de Campylobacter entre cães vadios e de estimação
The natural distribution of thermotolerant Campylobacter sp. in dogs (150 stray animals and 64 pets) was studied. Campylobacters were more frequently isolated (p<0.01) from stray dogs (51.3%) rather than from pet dogs (21.9%). All the biotypes described by Lior for C. jejuni and C. coli were found among stray animals, whereas only C. jejuni biotypes I and II and C. coli biotype II were found among pet dogs. The need for more studies related to the role of environmental sanitary conditions in the spreading of Campylobacter species is noted.<br>Foi estudada a distribuição natural de espécies termotolerantes de Campylobacter em 159 cães vadios e em 64 cães de companhia em confinamento permanente. Espécies de Campylobacter foram isoladas mais freqüentemente (p<0,01) dos cães vadios (51,3%) do que dos cães de companhia (21,9%). Todos os biotipos descritos por Lior para C. jejuni e C. coli foram encontrados entre as amostras isoladas dos cães vadios. Nas amostras isoladas dos cães mantidos em confmamento permanente somente foram encontrados os biotipos I e II de C. jejuni e o biotipo II do C. coli. Salienta-se a necessidade de realizar outros estudos para estabelecer a relação entre as condições de saneamento ambiental e a disseminação das espécies termotolerantes de Campylobacter
Generation of Agammaglobulinaemic Mice by Prenatal and Postnatal Exposure to Polyclonal or Monoclonal Anti-IgM Antibodies
Prevention of Gastric Cancer: When is Treatment of Helicobacter Pylori Warranted?
Chronic gastritis induced by Helicobacter pylori (H. pylori) is
the strongest known risk factor for adenocarcinoma of the distal stomach, yet
the effects of bacterial eradication on carcinogenesis remain unclear.
H. pylori isolates possess substantial genotypic diversity,
which engenders differential host inflammatory responses that influence clinical
outcome. H. pylori strains that possess the
cag pathogenicity island and secrete a functional cytotoxin
induce more severe gastric injury and further augment the risk for developing
distal gastric cancer. Carcinogenesis is also influenced by host genetic
diversity, particularly involving immune response genes such as
interleukin-1ß and
tumor necrosis factor-α. Human trials and anima
studies have indicated that eradication of H. pylori prior to
the development of atrophic gastritis offers the best chance for prevention of
gastric cancer. However, although the timing of intervention influences the
magnitude of suppression of premalignant and neoplastic lesions, bacterial
eradication, even in longstanding infections, is of clear benefit to the host.
It is important to gain insight into the pathogenesis of H.
pylori-induced gastritis and adenocarcinoma not only to develop
more effective treatments for gastric cancer, but also because it might serve as
a paradigm for the role of chronic inflammation in the genesis of other
malignancies that arise within the gastrointestinal tract