Results 251 to 260 of about 736,311 (296)
Some of the next articles are maybe not open access.
Osmotic and freezing tolerance in spermatozoa of freeze-tolerant and -intolerant frogs
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 1998The wood frog ( Rana sylvatica) is a freeze-tolerant species that encounters subzero temperatures during its winter breeding season, whereas the leopard frog ( R. pipiens) is freeze intolerant and breeds in spring. Osmotic and freezing tolerances of spermatozoa from these species were inferred from spermolysis rate, integrity of the plasma membrane as ...
J P, Costanzo +3 more
openaire +2 more sources
Freeze Tolerance of bermudagrasses
Crop Science, 2002Bermudagrasses, Cynodon spp., periodically sustain winter injury in the transition zone between warm‐ and cool‐season turfgrasses. Our objective was to determine relative freeze tolerance levels of advanced lines, recently released cultivars, and standard varieties by means of laboratory‐based methodology. Freeze tolerance evaluations were divided into
Jeff Anderson +2 more
openaire +2 more sources
Molecular Biology of Freezing Tolerance
Comprehensive Physiology, 2013Abstract Winter survival for many kinds of animals involves freeze tolerance, the ability to endure the conversion of about 65% of total body water into extracellular ice and the consequences that freezing imposes including interruption of vital processes (e.g., heartbeat and breathing), cell shrinkage, elevated ...
Kenneth B, Storey, Janet M, Storey
openaire +2 more sources
Anoxia tolerance and freeze tolerance in hatchling turtles
Journal of Comparative Physiology B, 2005Freezing survival in hatchling turtles may be limited by ischemic anoxia in frozen tissues and the associated accumulation of lactate and reactive oxygen species (ROS). To determine whether mechanisms for coping with anoxia are also important in freeze tolerance, we examined the association between capacities for freezing survival and anoxia tolerance ...
S A, Dinkelacker +2 more
openaire +2 more sources
Freeze Tolerance and Freeze Avoidance in Ectotherms
1989The vast majority of ectothermic animals on earth must elude exposure to subzero temperatures to prevent the lethal freezing of body fluids. For this reason the northern ranges of many ectotherms are limited; thus, few terrestrially-hibernating reptile and amphibian species are found in northern latitudes (Behler and King 1979) and the diversity of ...
K. B. Storey, J. M. Storey
openaire +1 more source
Freezing Tolerance in an Adult Insect
Science, 1969The adult carabid beetle Pterostichus brevicornis tolerates freezing under natural conditions. Laboratory tests confirm that winter beetles tolerate temperatures below -35°C, whereas summer beetles die if frozen at -6.6°C. Winter beetles can be cooled to about -10°C before freezing, and they thaw near -3.5°C. Summer
openaire +2 more sources
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 1993
Freeze tolerance in the wood frog, Rana sylvatica, is promoted by multiple, integrated physiological responses to ice forming within body tissues. By analyzing the freezing responses of the sympatric, but freeze intolerant, leopard frog (R. pipiens), we sought clues to the evolution of anuran freeze tolerance.
J P, Costanzo, R E, Lee, P H, Lortz
openaire +2 more sources
Freeze tolerance in the wood frog, Rana sylvatica, is promoted by multiple, integrated physiological responses to ice forming within body tissues. By analyzing the freezing responses of the sympatric, but freeze intolerant, leopard frog (R. pipiens), we sought clues to the evolution of anuran freeze tolerance.
J P, Costanzo, R E, Lee, P H, Lortz
openaire +2 more sources
Organic Solutes in Freezing Tolerance
Comparative Biochemistry and Physiology Part A: Physiology, 1997The accumulation of high levels of low-molecular-weight solutes (polyhydric alcohols, saccharides) provides cryoprotection to freeze-tolerant animals by minimizing, via colligative effects, the percentage of body water converted to extracellular ice and the extent of cell volume reduction.
openaire +2 more sources
Freezing Tolerance in Some Antarctic Nematodes
Functional Ecology, 1993Nematodes are an important component of the terrestrial Antarctic biota and must survive exposure to sub-zero temperatures. This paper shows that a number of Antarctic nematodes are freezing tolerant. The cold tolerance strategies of nine taxa of terrestrial Antarctic nematodes from a variety of mosses and an alga during freezing in contact with water ...
Wharton, D. A., Block, William
openaire +2 more sources
Natural Freeze Tolerance in Ectothermic Vertebrates
Annual Review of Physiology, 1992Amphibians 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 ...
K B, Storey, J M, Storey
openaire +2 more sources