title: Calorimetric and freeze-etch study of the influence of Mg2+ on the thermotropic behaviour of phosphatidylglycerol.
abstract: In the presence of Mg2+ ions phosphatidylglycerol shows supercooling which leads to the formation of a metastable gel phase. This contrasts with the behaviour of this negatively charged phospholipid in the presence of Ca2+ ions (Biochim. Biophys. Acta 39. (1974)432)9 It is demonstrated that the heat content of this phospholipid is dependent on the ionic environment.
mesh_terms: D001665:Binding Sites; D002118:Calcium; D002151:Calorimetry; D005069:Evaluation Studies as Topic; D005613:Freeze Etching; D007700:Kinetics; D008081:Liposomes; D008274:Magnesium; D008722:Methods; D008854:Microscopy, Electron; D008968:Molecular Conformation; D010715:Phosphatidylglycerols; D010743:Phospholipids; D013696:Temperature; D013816:Thermodynamics
chemical_list: D008081:Liposomes; D010715:Phosphatidylglycerols; D010743:Phospholipids; D008274:Magnesium; D002118:Calcium