Results 211 to 220 of about 6,647 (234)

T‐cell receptors in ectothermic vertebrates

Immunological Reviews, 1998
Summary: The structure and expression of genes encoding molecules homologous to mammalian T‐cell receptors (TCR) have been recently studied in ectothermic vertebrate species representative of chondrychthians, teleosts, and amphibians. The overall TCR chain structure is well conserved in phylogeny: TCRβ‐ and TCRα‐like chains were detected in all the ...
Jacques Charlemagne, Fabienne Kerfourn, Arnaud De Guerra, Julien S. Fellah, Sylvie Partula   +4 more
openaire   +3 more sources

Temperature and cardiac adrenoceptors in ectotherms

Journal of Thermal Biology, 1991
Abstract 1. 1.|Cardiac adrenoceptors in a snake, Ptyas korros, and a newt, Triturus sp. were examined in winter months using isolated atrial preparations maintained at 6°C. Treatments included stimulation of the isolated atria with selective α and β adrenergic agonists (phenylephrine and isoproterenol respectively) in the presence or absence of a
K.W. Chiu, Y.C. Lee
openaire   +2 more sources

Natural Freeze Tolerance in Ectothermic Vertebrates

Annual Review of Physiology, 1992
Amphibians and reptiles living in seasonally cold regions of the earth face several challenges to their continued survival. These include short summer seasons for the development of eggs and juveniles, long periods of fasting when food supplies are interrupted by winter, and months of cold exposure at environmental temperatures often well below the ...
Kenneth B. Storey, Janet M. Storey
openaire   +3 more sources

Introduction to the special issue: Ecoimmunology in ectotherms

Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, 2020
 
Stefanny C. M. Titon, Vania R. Assis
openaire   +3 more sources

On the transient temperatures of ectotherms

Journal of Thermal Biology, 1987
Abstract Studies of the heating and cooling rates of ectotherms usually report only a time contant for temperature change. This implies that the transient temperatures of ectotherms behave like a first-order physical system. However, the transient temperatures of ectotherms may behave more like an overdamped second-order system.
openaire   +2 more sources

Avoidance and tolerance of freezing in ectothermic vertebrates

Journal of Experimental Biology, 2013
Summary Ectothermic vertebrates have colonized regions that are seasonally or perpetually cold, and some species, particularly terrestrial hibernators, must cope with temperatures that fall substantially below 0°C. Survival of such excursions depends on either freeze avoidance through supercooling or freeze tolerance.
Richard E. Lee, Jon P. Costanzo
openaire   +2 more sources

Patterns of Thermal Constraint on Ectotherm Activity

The American Naturalist, 2015
Thermal activity constraints play a major role in many aspects of ectotherm ecology, including vulnerability to climate change. Therefore, there is strong interest in developing general models of the temperature dependence of activity. Several models have been put forth (explicitly or implicitly) to describe such constraints; nonetheless, tests of the ...
Manuel Leal, Alex R. Gunderson
openaire   +3 more sources

Effects of Temperature on Intraspecific Competition in Ectotherms

The American Naturalist, 2014
Understanding how temperature influences population regulation through its effects on intraspecific competition is an important question for which there is currently little theory or data. Here we develop a theoretical framework for elucidating temperature effects on competition that integrates mechanistic descriptions of life-history trait responses ...
Amarasekare, Priyanga, Coutinho, Renato M.   +1 more
openaire   +3 more sources

Temperature and hypoxia in ectothermic tetrapods

Journal of Thermal Biology, 2007
Abstract (1) Interactions between temperature and hypoxia in ectothermic tetrapods (reptiles and amphibians) are reviewed. (2) At temperature extremes, mismatches between oxygen demand and oxygen supply can lead to hypoxemia. Thresholds for both physiological and behavioral responses to hypoxia are elevated at high temperature and aerobic ...
openaire   +2 more sources

Hydroregulation in a tropical dry-skinned ectotherm

Oecologia, 2016
While temperature effects on species' vulnerability to climate change are well studied, desiccation effects receive comparatively little attention. In addition, we poorly understand the capacity of ectotherms, and especially reptiles, to control water loss rates behaviourally by selecting suitable microhabitats. This study examined water loss rates and
Pintor, Anna F.V., Schwarzkopf, Lin, Krockenberger, Andrew K.   +2 more
openaire   +4 more sources