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Plant and Cell Physiology, 1986, Vol. 27, No. 8 1593-1598
© 1986

Short Communication

Thermal Properties of Membrane Lipids from two Cyanobacteria, Anacystis nidulans and Synechococcus sp.

David G. Bishop1,*, Janette R. Kenrick1, Takao Kondo2 and Norio Murata2

1Plant Physiology Unit, CSIR0 Division of Food Research and School of Biological Sciences, Macquarie University North Ryde, 2113, NSW, Australia
2National Institute for Basic Biology Okazaki 444, Japan

The composition and positional distribution of fatty acids in monogalactosyldiacylglycerol, digalactosyldiacylglycerol, phosphatidylglycerol and sulphoquinovosyldiacylglycerol from two cyanobacteria, Anacystis nidulans and Synechococcus sp. grown at 25°C have been determined and compared with measurements of the phase separation temperatures of the lipids. Only monogalactosyldiacylglycerol in Anacystis and sulphoquinovosyldiacylglycerol in Synechococcus showed phase separation temperatures above 0°C. The phase transition temperature of a sample of sulphoquinovosyldiacylglycerol containing over 90% of the dihexadecanoyl molecular species has been determined to be 43°C for the Na+ salt and 38°C for the Mg++ salt.

*Deceased. September 14, 1986.

(Received June 25, 1986; Accepted August 25, 1986)
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