Calcium channel inactivation in frog (Rana pipiens and Rana moctezuma) skeletal muscle fibres.

Anatomy and Physiology of Vision in the Frog (Rana pipiens)

Frogs arc essentially dependent on vision. They fccd on worms, flies, and other insects which they catch directly with the mouth or by striking them with the tongue; for this they use only visual clues. Furthermore, frogs prey only on moving insects, and their attention is never attracted by stationary creatures or objects. Nor do they respond with feeding behavior to a large moving object, ins...

Fast calcium currents in cut skeletal muscle fibres of the frogs Rana temporaria and Xenopus laevis.

Multiple types of voltage-gated Ca channels have been described in a variety of excitable cells (for a review see Tsien et al. 1987). Electrophysiological and biochemical properties of the slow Ca channels in skeletal muscle have been intensively studied during the last decade (for a review see Beaty et ai. 1987; Fosset and Lazdunski 1987). However, recently a fast low threshold Ca 2 + current ...

Two sex-linked loci in the leopard frog, Rana pipiens.

Crosses involving one heterozygous parent were performed to test the inheritance of enzymes in the leopard frog, Rana pipiens. After metamorphosis, offspring were sexed and tissue extracts from them were analyzed by gel electrophoresis. Enzyme genotype and sex showed independent assortment for 10 of 12 enzymes heterozygous in the male parent. However, among the offspring of males heterozygous f...

Histology of the oviduct of the leopard frog, Rana pipiens.

Metabolic effects of dehydration on an aquatic frog, Rana pipiens.

Cellular responses to dehydration were analyzed in six organs of leopard frogs Rana pipiens. Frogs at 5 degrees C endured the loss of up to 50% of their total body water content but water contents of individual organs were strongly defended. Skeletal muscle water content was strongly affected by dehydration, dropping from 80.7% of wet mass in controls to 67.2% in frogs that had lost 50% of thei...