Gram-positive bacteria, occurrence

The ubiquitous occurrence of bacteria, which can utilize biphenyl as a sole source of carbon and energy, has been reported. Several species of Gram-negative and Gram-positive bacteria have been shown to degrade biphenyl and PCBs. The main pathway for biphenyl catabolism is outlined in Figure 3 [58-66]. 

The occurrence and concentration of phosphoglycolipids in various families of Gram-positive bacteria have been determined. Phosphatidylglycolipids occur exclusively in group D streptococci and S. haemolyticus. The prevalent species, phosphatidyl-a-kojibiosyldiacylglycerol, accounted for 28% of the... 

Table 3. Occurrence of Ornithine-containing Lipids in Gram Positive Bacteria... 

The occurrence of sialic acids in bacteria and their relationship to pathogenicity have been studied in some detail. Aaronson and Lessie (1960) examined the presence of sialic acids in several classes of bacteria and concluded that sialic acids are limited to the gram-negative bacteria. A later study, however, has indicated that some gram-positive bacteria also contain sialic acids, and the species examined all are pathogenic (Irani and Ganapathi, 1962 Luppi and Cavazzini, 1966). In Escherichia coli, both A-acetylneuraminic and N-acetyl-7-O-acetylneuraminic acids... 

Phosphatidylinositol is uncommon in bacteria and is found in a few Gram-positive species only. In actinomycetes and a few other bacteria mannosides of phosphatidylinositol may be present. Other glycerophospholipids such as phosphatidic acid and phosphatidylserine have a widespread occurrence in bacteria but only in small amounts. Both of these lipids play an important role as metabolic intermediates (Finnerty, 1978 Raetz, 1978). 

Irani, R. J., and Ganapathi, K., 1%2, Occurrence of sialic acid in some gram-positive and gram-negative pathogenic bacteria. Nature 195 1227. 

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