منابع مشابه
Salmonella typhimurium strains carrying haemolysin plasmids and cloned haemolysin genes from Escherichia coli.
Like all other Salmonella typhimurium strains examined, the smooth variants SF1397 (LT2) and 1366 and also their semi-rough and rough derivatives are non-haemolytic. Nevertheless, two haemolysin (Hly) plasmids of E. coli belonging to the inc groups incFIII,IV (pSU316) and incI2 (pHly152) were able to be introduced into these strains by conjugation and stably maintained. A considerable percentag...
متن کاملContact-haemolysin production by entero-invasive Escherichia coli and shigellae.
Entero-invasive Escherichia coli (EIEC) and shigellae were tested for contact-haemolysin (CH) with red blood cells (RBCs) of guinea-pig, rabbit, rat, mouse, monkey, man, sheep and chicken; all bacteria showed the best lysis with guinea-pig RBCs. The best culture medium for CH activity of shigellae was tryptic soy broth, and for EIEC it was casamino acid-yeast extract broth with 1 mM CaCl2. CH p...
متن کاملThe nutritional properties of killed Bacterium coli.
A previous investigation had shown that the protein and polysaccharide components of enteric bacteria can be separated by heating the cells in a watery suspension at 80" for I h (Roberts, 1949). In continuation of this work the protein of Bacterium coli was fed to rats and guinea-pigs and it was found that if the diet satisfied the peculiar vitamin requirements of the experimental animals, as, ...
متن کاملGene Recombination in the Bacterium Escherichia coli.
The study of inheritance in bacteria has, for the most part, been confined to the investigation. of mutational changes in the course of clonal reproduction. With the exception of experiments on pneumococcus type transformations there have been few studies on the direct hereditary interaction of one bacterial type with another. The conception that bacteria have no sexual mode of reproduction is ...
متن کاملSwimming efficiency of bacterium Escherichia coli.
We use measurements of swimming bacteria in an optical trap to determine fundamental properties of bacterial propulsion. In particular, we directly measure the force required to hold the bacterium in the optical trap and determine the propulsion matrix, which relates the translational and angular velocity of the flagellum to the torques and forces propelling the bacterium. From the propulsion m...
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ژورنال
عنوان ژورنال: Journal of General Microbiology
سال: 1951
ISSN: 0022-1287
DOI: 10.1099/00221287-5-4-788