By A.H. Rose (ed.), D.W. Tempest (ed.)

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1969; Abrams and Baron, 1968; Ishida and Mizushima, 1969). Nevertheless it is like the microbial and mitochondria1 ATPases in that it is not stimulated by sodium and potassium and is insensitive to ouabain (Rottem and Razin, 1966; Cho and Morowitz, 1969). It is still not clear whether the ATPase andp-nitrophenyl phosphatase activities of membranes from A . laidlawii are the expression of a single enzyme. , 1971), organic solvents (L. Qottfried and S. Kahane, Z. Ne’eman and S. Razin, unpublished data) seem to indicate that they are not.

Coli. Conditions preventing RNA synt,hesis also inhibited thymine-less death, which therefore appears to be associated with RNA synthesis. The idea that it might be caused by induction of a defective episome or a prophage, raised as a remote possibility by Smith and HanawaIt (1968), should now be reconsidered in light of the finding that many A . laidlawii cultures are infected with specific viruses. Smith and Hanawalt (1968) also examined the effect of inhibition of protein synthesis on DNA synthesis in A .

Adapted from Rodwoll et al. (1972). place in the thymine-deprived organisms. After 12 to 24 h, the cultures contained numerous minute particles, thin, flexible, threadlike filaments and other minute, often bizarre, forms like the minicells of E . coli, devoid of DNA. Although the effects of inhibition of protein and RNA synthesis on the synthesis of the other macromolecules have not yet been demonstrated, it may be tentatively concluded that synthesis of lipids, proteins and DNA in the mycoplasma strain Y are not stringently co-ordinated, and that a t least this mycoplasma has no stringent control mechanisms for co-ordinating macromolecular synthesis.

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