“…As discussed elsewhere in this volume, the zwitterionic and anionic lipids arise from CDP-diacylglycerol via separate pathways and CL is derived from PG. The proportion of anionic phospholipid increases as the proportion of zwitterionic phospholipid decreases when bacteria are grown in media of increasing salinity [6,7,21,45,47,48,73,74,78,85,86,88]. This behaviour is shared by Gram positive and Gram negative, halophilic and halotolerant bacteria (see Table 1 (representative data) and reviews [73,78,80]).…”