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解剖了一条出现腹泻等症状、经治疗无效死亡的海豚 ,发现肺、肝、脾、胃等均有病变 ,从病变组织器官中分离到 7株细菌 ,通过菌株的形态、染色特征、生化特性、血清学鉴定 ,发现其中 5株菌株为大肠艾希氏菌 O8血清型 ,另 2株分别为普通变形杆菌和奇异变形杆菌。动物试验表明 ,大肠埃希氏菌和变形杆菌是海豚发病的致病菌。 7个菌株均对菌必治和先锋噻肟高敏 ,对氯霉素、链霉素、痢特灵等中敏 ,对青霉素 G、氨苄青霉素等耐药 相似文献
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It was suggested that the proteus blind cave salamander can sense the geomagnetic field using magnetic crystals (like magnetite). We attempted to check this hypothesis by measuring the magnetization and the magnetic mineralogy of proteus from the Moulis CNRS underground laboratory. The abdomen and the rear legs of the animals were the unique body parts that revealed a detectable saturation magnetization in the order of 10?9 A?m2. Because this magnetization was carried by magnetite crystals that have the same magnetic properties as the soil sampled in the cave, it is likely that they were ingested by the animals. Thus these experiments did not detect any crystal that would be responsible for magnetotactism. These results are in contrast with those published for the newt [J. Brassart, J.L. Kirschvink, J.B. Phillips, S.C. Borland, Ferromagnetic material in the eastern red-spotted newt, J. Exp. Biol. 202 (1999) 3155]. However the cryogenic magnetometers do not allow us to detect very small amounts of monodomain grains. This prevents us from any definite conclusion until the construction of a very sensitive cryogenic gradiometer. To cite this article: H. Bouquerel, J.-P. Valet, C. R. Geoscience 337 (2005). 相似文献
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