الفهرس 
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Abstract
Various types of antibiotics were used for the iso- lat! on and pur1ficati on of differen t cul, turee of Ql. welc hii types A, Band D. The morphological, biochenical and bio-
10~ical changes which occur in the organism itself I”,’r’ in its
products (toxins) were determined, these changes we.re stud Ie d
in a series of experiments, and the results proved that:
1) 10 ug/ml of lincocin could be used for isolation and purification Of Cl. welchiitypes A, Band D.
2) The shape of the o rg an Lsm as well as that of the clostridial colonies of either laboratory or clinically iso-
lated strains of 21. welchii types A, B and D on blood agar plates did not change by the addition of the antibiotics to the cul tures.
3) The diameter of the haemolytic z ona s .of colonies on
p l.a t e s as well as the length of the organism of Cl. welchii
type A had been much decreased than those of the control
(without antibiotics) by all the used antibiotics especially
Lincocin (10 ug/ml) and Kanamycin (250 ug/ml).