Results 261 to 270 of about 187,838 (300)

Cold adaptation in marine organisms

Philosophical Transactions of the Royal Society of London. B, Biological Sciences, 1990
Animals from polar seas exhibit numerous so called resistance adaptations that serve to maintain homeostasis at low temperature and prevent lethal freezing injury. Specialization to temperatures at or below 0 °C is associated with an inability to survive at temperatures above 3-8 °C.
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Cold-Adapted and Mesophilic Brachyurins

Biological Chemistry, 2002
Two different types of brachyurins, termed I and II, have been described in the literature. Within type I there are two subtypes, Ia and Ib. The prototype for the type I brachyurins is Fiddler crab collagenase I. Its cold-adapted analogue from Antarctic krill, termed euphaulysin, shares many of its characteristics.
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Psychrophiles - Cold-Adapted Hydrocarbon-Degrading Microorganisms

2010
Throughout the year a high percentage of the biosphere, about 85%, is permanently exposed to temperatures below 5 C. Despite the inhospitable nature of low-temperature environments they are successfully colonized by cold-adapted microorganisms (both psychrophiles and psychrotolerant).
LO GIUDICE, ANGELINA, BRUNI, Vivia, DE FRANCESCO, Maria, MICHAUD, LUIGI   +3 more
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Cold Adaptation of Triosephosphate Isomerase

Biochemistry, 2017
The main problem for enzymes from psychrophilic species, which need to work near the freezing point of liquid water, is the exponential decay of reaction rates as the temperature is decreased. Cold-adapted enzymes have solved this problem by shifting the activation enthalpy-entropy balance for the catalyzed reaction compared to those of their ...
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Importance of noradrenaline in cold adaptation

American Journal of Physiology-Legacy Content, 1964
Noradrenaline (300 µg/kg) was injected daily for 45 days in a group of 15 rats. At the end of this period O2 consumption and rectal temperature responses to noradrenaline (200 µg/kg) were measured at 30 C in these animals as well as in cold-acclimated and control groups.
J, LEBLANC, M, POULIOT
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Cold Adaptation of Enzyme Reaction Rates

Biochemistry, 2008
A major issue for organisms living at extreme temperatures is to preserve both stability and activity of their enzymes. Cold-adapted enzymes generally have a reduced thermal stability, to counteract freezing, and show a lower enthalpy and a more negative entropy of activation compared to mesophilic and thermophilic homologues.
Sinisa, Bjelic, Bjørn O, Brandsdal, Johan, Aqvist   +2 more
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Cold Adaptation in DEAD-Box Proteins

Biochemistry, 2010
Spontaneous rearrangements of RNA structures are usually characterized by large activation energies and thus become very slow at low temperatures, yet RNA structure must remain dynamic even in cold-adapted (psychrophilic) organisms. DEAD-box proteins constitute a ubiquitous family of RNA-dependent ATPases that can often unwind short RNA duplexes in ...
Gwendoline, Cartier, Florence, Lorieux, Frédéric, Allemand, Marc, Dreyfus, Thierry, Bizebard   +4 more
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Cold-Stable and Cold-Adapted Microtubules

1995
Most mammalian microtubules disassemble at low temperature, but some are cold stable. This probably has little to do with a need for cold-stable microtubules, but reflects that certain populations of microtubules must be stabilized for specific functions. There are several routes by which to achieve cold stability.
M, Wallin, E, Strömberg
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Cold adaptation and the human face

American Journal of Physical Anthropology, 1970
AbstractA framework is suggested within which the evolutionary biology of the human head and face can be explored; it includes several channels of natural and behavioral selection as well as modes of “plasticity” change.One aspect of the model is then examined by means of physiological and anthropometric experimentation.
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Serine Proteinases from Cold-Adapted Organisms

1997
Proteins and especially enzymes from organisms that have adapted to extreme conditions in environmental temperatures have been a subject of considerable interest in both basic and applied research for number of years. Sofar most of the research has focused on enzymes from thermophilic microorganisms.
M M, Kristjánsson, B, Asgeirsson, J B, Bjarnason   +2 more
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