Garrett A Meek

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The mitochondria in type-I and -II muscle fibres in the pectoralis major muscle of the pigeon (Columba livia) have been analysed using stereological techniques not previously applied in muscle biology. Mitochondrial volume fractions (VV) were estimated in different regions of each type of muscle fibre using randomly orientated sampling sectors within fibre(More)
Spermatids of the snail Helix aspersa were studied after fixation in buffered osmium tetroxide and after applying Novikoff and Goldfischer's method (15) for demonstrating thiamine pyrophosphatase (TPPase) activity both with the light and the electron microscope. The appearance of cells in the light microscope after localizing the enzyme is very similar to(More)
In the course of a light and electron microscopy study of spermatogenesis in the European crayfish, Astacus fluviatilis, spermatocytes of abnormal appearance were observed in two instances in individuals that had passed the mating period. The electron microscope showed that the inner membrane of the nuclear envelope of these cells was erupting into a mass(More)
1. Unlike yeast cells grown on glucose (0.9%), cells grown on galactose aerobically or anaerobically as well as cells grown on very low glucose concentrations (0.09%) have been found to possess mitochondria. 2. Synthesis of respiratory enzymes was less in the presence of glucose than galactose. When either sugar was consumed, synthesis of these enzymes(More)