The miniature excitatory postsynaptic currents (MEPCs) of the muscle cells of the earthworm Lumbricus terrestris were recorded by glass microelectrodes. In a single synaptic zone, three types of MEPC were recorded: a fast single-exponential type that decayed with τ =0.9 ms, a slow single-exponential with τ = 9.2 ms and a two-exponential MEPC with τ = 1.3 and 8.5 ms, respectively. The muscle cel...

Purified phosphofructokinase from the earthworm Lumbricus terrestris was phosphorylated in vitro by the catalytic subunit of cAMP-dependent protein kinase from the same organism to an extent of approx. 0.5 mol/mol of subunit. Activation of the enzyme occurred in parallel to the incorporation of covalently bound phosphate and was reversed by the action of the catalytic subunit of protein phospha...

The paper discusses combinatorial and probabilistic models allowing to characterize various aspects of spacial symmetry and structural heterogeneity of the giant hexagonal bilayer hemoglobins (HBL Hb). Linker±dodecamer con®gurations of HBL are described for two and four linker types (occurring in the two most studied HBL Hb of Arenicola and Lumbricus, respectively), and the most probable con®gu...