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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Influ?ncia da aflatoxina B1 sobre a fagocitose de Escherichia coli em galinhas Hubard X Hubard

Carvalho, Jos? Lu?s de 22 September 1998 (has links)
Made available in DSpace on 2016-04-28T20:17:28Z (GMT). No. of bitstreams: 1 1998 - Jose Luis de Carvalho.pdf: 155465 bytes, checksum: 7d8adfe2d500eb89d6de012ebb6c3718 (MD5) Previous issue date: 1998-09-22 / The present thesis was concerned to imnunoassays, carried out in order to evaluate the aflatoxin interference on the inflammatory mechanisms. Experiments were done by in vivo procedures. In the in vivo experiments, chickens (Hubard x Hubard) received 100 μg / g de aflatoxin, 2 hours before infection with Escherichia coli. The blood clearance of Escherichia coli, was determined by haemoculture and quantification of the bacteria colonies in tryptose agar medium at different intervals ( 5, 10, 15, 30, 45, 60, 120 minutes). A significant decrease of the number of colonies recovering was observed at the 15 minutes period, of aflatoxin-trated chikens. From there on, animals intoxicated with aflatoxin were not able to eliminate the circulating bacterias. Aflatoxin-trated chikens, there were detectable a significant decrease of number of bacteria colonies on the organ, than in the control group. The per cent of bacterias were found in the spleen and liver, with the rate of 91.9 % and 7.6 %, respectively. The results have been shown, aflatoxin to be a micotoxin hepatotoxic and nephrotoxic. / O presente trabalho foi realizado com o intuito de determinar a extens?o dos preju?zos causados ao sistema imunit?rio pela aflatoxina. A modula??o inflamat?ria foi avaliada atrav?s de ensaios in vivo, realizados em aves Hubard x Hubard, previamente expostos ? aflatoxina (100 μg / g de peso vivo - 2 horas antes da infec??o). Os experimentos in vivo basearam-se na elimina??o ( clearance ) de Escherichia coli (amostra k-12 - FIOCRUZ), apartir de infec??es experimentais, seguidas de sangria, hemocultivo e contagem do n?mero de bact?rias circulantes em diferentes intervalos de tempo. Observou-se uma acentuada diminui??o do n?mero de bact?rias circulantes durante os 15 minutos de avalia??o no grupo tratado. Apartir de ent?o, os animais intoxicados mostraram-se incapazes de eliminar bact?rias circulantes, evidenciando ter havido uma supress?o da resposta inflamat?ria. Nos animais intoxicados, foi dectado uma acentuada diminui??o do n?mero de bact?rias nos ?rg?os em compara??o com os n?o tratados . O percentual de bact?rias foi maior no ba?o e f?gado, com uma taxa de 91,9% e 7,6% respectivamente. Os resultados mostraram a hepatoxicidade e nefrotoxicidade das aflatoxinas.

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