(1) The activity of the endogenously active salivary burster neurones (SBs) shows temperature acclimation and has characteristic cold and warm blockade temperatures. (2) Temperature acclimation affects the upper and lower limits of the temperature range over which SBs are active. The absolute range, in centigrade degrees, during warming, is unaffected by acclimation. (3) Acclimatization of burs...

temperature within a very narrow temperature range. Therefore, when body temperature rises above its normally regulated range, because of either environmental factors or excess metabolic heat production, irreversible thermoregulatory failure may rapidly develop. Operating at a very “high gain,” the thermoregulatory system works in concert with a set of coded behavioral functions to prevent/atte...

Bufo viridis were acclimated to hyperosmotic solutions of NaCl, urea or mannitol. The toads could not be acclimated to mannitol solutions of osmotic strength higher than 300 mosmol kg-1 H2O, but could be acclimated easily to NaCl and urea higher than 500 mosmol kg-1 H2O. Water uptake diminished under mannitol acclimation while the apparent osmotic permeability under NaCl and urea acclimation in...

1. The effects of 1 or 2­3 weeks of acclimation to 4 °C and 24 °C of overwintering grass frogs (Rana temporaria) on the synaptic delay and on the time constant of the decay phase (tau) of miniature end-plate currents (MEPCs) in the neuromuscular junction of sartorius muscle were studied. In order to equalize the possible effects of differential starvation, the animals were usually c...

The thermoregulatory behavior of sea hare Aplysia californica was determined in a horizontal thermal gradient; with a preferred temperature (PT) of 18.3 ̊C for the day cycle and 20.8 ̊C for the night cycle. The displacement velocity demonstrated an initial rate of 30 cm·h and gradually the velocity diminished to 18 cm·h with several fluctuations mainly at 02:00 am. Critical Temperature Maxima (CT...

The purpose of the present study was to determine the separate and combined effects of aerobic fitness, short-term heat acclimation, and hypohydration on tolerance during light exercise while wearing nuclear, biological, and chemical protective clothing in the heat (40 degrees C, 30% relative humidity). Men who were moderately fit [(MF); <50 ml . kg-1 . min-1 maximal O2 consumption; n = 7] and ...

Plasticity of the thermoregulatory system is a key factor for the induction of heat acclimation. Temperature-adaptive shifts in gene expression play an essential role in the processes involved. This review attempts to bridge the gap between the classical physiological heat acclimation profile and the molecular/cellular mechanisms underlying the evolution of the acclimated phenotype. Essential a...