Rodent

Elevation of adrenal Tyrosine hydroxylase and phenylethanolamine-N-methyl transferase by repeated immobilization of rats

Immobilization result in a neuronally dependent elevation of tyrosine hydroxilase in the adrenal medulla.

Year Published: 1970Animal Type: Rat, Rodent

Citation: Kvetnansky, R., Weise, V. K., Kopin, I. 1970. Elevation of adrenal Tyrosine hydroxylase and phenylethanolamine-N-methyl transferase by repeated immobilization of rats. Endocrinology 87, 744-749.

Adrenal and urinary catecholamines in rats during adaption to repeated immobilization stress

Rats subjected to daily immobilization for up to one year still excreted greater amounts of epinephrine than did control animals or animals after their first immobilization. These increases levels of urinary ephinephrine were not accompanied by a decrease in adrenal...

Year Published: 1970Animal Type: Rat, Rodent

Citation: Kvetnansky, R., Mikulaj, L. 1970. Adrenal and urinary catecholamines in rats during adaption to repeated immobilization stress. Endocrinology 87, 738-743.

Brain weight increases resulting from environmental enrichment: a directional dominance in mice

Sets of our male and sets of four female C3HxBALB hybrid mice were raised in (1) small standard cages [280 cm2] that were barren, vs.(2) large test cages [1375 cm2] that were barren, vs.(3) large test cages [1375 cm2] that...

Year Published: 1970Animal Type: Mouse, Rodent

Citation: Henderson, N. D. 1970. Brain weight increases resulting from environmental enrichment: a directional dominance in mice. Science 169(947), 776-778.

Studies of brain weight and RNA content after short periods of exposure to environmental complexity

Rats in Environmental Complexity (EC) were compared with litter mates maintained in Impoverished Conditions (IC) for various times. An initial relatively fast onset of the difference between the cerebral weight of the EC and IC rats was observed. This phase...

Year Published: 1970Animal Type: Rat, Rodent

Citation: Ferchmin, P. E., Eterovic, V. A., Caputto, R. 1970. Studies of brain weight and RNA content after short periods of exposure to environmental complexity. Brain Research 20, 49-57.

Experimental modification of brain weight and behavior in mice: An enrichment study

The effects of environmental enrichment and isolation on cortical weight and learning ability were measured in mice from lines selectively bred for high and low brain weight and from an unselected control line from the same foundation population. Animals from...

Year Published: 1970Animal Type: Mouse, Rodent

Citation: Collins, R. 1970. Experimental modification of brain weight and behavior in mice: An enrichment study. Psychobiology 3, 145-155.

Biological significance, genetics and evolutionary origin of variability in behaviour within and between inbred strains of mice (Mus musculus)

The biological significance, the origin and the genetical causation of differences in behaviour between inbred strains of mice have been studied. Three inbred strains with different origins were used, these were CPBs (Balb), CBA and C57Black. Exploratory behaviour, nestbuilding behaviour...

Year Published: 1971Animal Type: Mouse, Rodent

Citation: Van Oortmerssen, G. A. 1971. Biological significance, genetics and evolutionary origin of variability in behaviour within and between inbred strains of mice (Mus musculus). A behaviour genetic study. Behaviour 38, 1-92.

Environmental influence on brain and behavior of year-old rats

The beneficial effects of environmental enrichment are not restricted to a brief cricial period in development. Positive effects occur also in rats aged 300 days when first placed in an enriched environment.

Year Published: 1971Animal Type: Rat, Rodent

Citation: Riege, W. H. 1971. Environmental influence on brain and behavior of year-old rats. Developmental Psychobiology 4, 157-167.

Reinforcing properties of spontaneous activity in the rat

Required 21 male sprague-dawley rats to bar press on an ascending sequence of fixed-ratio requirements in order to run in either a voluntary treadmill or a braked running wheel. In both testing situations the duration of the burst of running...

Year Published: 1971Animal Type: Rat, Rodent

Citation: Collier, G. H., Hirsch, E. 1971. Reinforcing properties of spontaneous activity in the rat. Journal of Comparative and Physiological Psychology 77, 155-160.

Physiological responses to blood collection methods in rats

Plasma glucose levels are related to the length of handling time during blood collection.

Year Published: 1971Animal Type: Rat, Rodent

Citation: Besch, E. L., Chou, B. J. 1971. Physiological responses to blood collection methods in rats. Proceedings of the Society for Experimental Biology and Medicine 138, 1019-1021.

Circadian alteration of audiogenic seizure susceptibility in rats

Genetically determined audiogenic seizure susceptibility in Wistar albino rats showed distinct rhythmicity with its increase and decrease during night and day, respectively. This rhythmicity is apparently regulated by light since its trend can be readily reversed by artificially reversing the...

Year Published: 1970Animal Type: Rat, Rodent

Citation: Wada, J. A., Asakura, T. 1970. Circadian alteration of audiogenic seizure susceptibility in rats. Experimental Neurology 29, 211-214.