Primary charge separation in photosystem I: a two-step electrogenic charge separation connected with P700+A0- and P700+A1- formation.

A PS I membrane preparation from a PS II deficient mutant of Synechocystis sp. PCC 6803 (psb DI/DII/C) was investigated by picosecond photovoltage and fluorescence measurements. The photovoltage kinetics show two distinct phases.

Effect of magnesium on the contractile behavior of actomyosin aggregates isolated from Physarum plasmodia.

The dependence on calcium concentration of the contractile behavior of actomyosin isolated from Physarum plasmodia according to Kohama & Kendrick-Jones (1986) was investigated under different magnesium conditions. The inhibitory calcium sensitivity is reduced at magnesium concentrations above or below 1 mM, i.e.