hibernation

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hibernation

 [hi″ber-na´shun]
a dormant state in which certain animals pass the winter, marked by deep sleep and sharp reduction in body temperature and metabolism.
artificial hibernation a state of reduced metabolism, muscle relaxation, and a twilight sleep resembling narcosis, produced by controlled inhibition of the sympathetic nervous system and causing attenuation of the homeostatic reactions of the organism.

hi·ber·na·tion

(hī'bĕr-nā'shŭn),
A torpid condition in which certain animals pass the cold months. True hibernators, such as woodchucks, ground squirrels, dormice, and some others, have body temperatures reduced to near the freezing point, with a very slow heartbeat, low metabolism, and infrequent respirations. Partial hibernators, such as bears, skunks, and raccoons, have reduced physiologic activity during the cold months, but they are not comatose. Compare: estivation.
Synonym(s): winter sleep
[L. hibernus, relating to winter]
Cardiology Myocardial hibernation
Physiology Astate of winter dormancy and hypothermia seen in bears and other animals

hi·ber·na·tion

(hī'bĕr-nā'shŭn)
A torpid condition in which some animal species pass the cold months.
Compare: estivation
Synonym(s): winter sleep.
[L. hibernus, relating to winter]

hibernation

a state of dormancy entered into by many animals during the winter, particularly those in cooler latitudes. Some temperate and arctic mammals, reptiles and some amphibians hibernate and, in this state, the METABOLISM is slowed down and the body temperature falls. Hibernation is generally triggered by cold weather and whilst body temperatures in mammals normally are maintained at the usual level, they may fall much lower and near to freezing point (in e.g. hamster), or to that of the surroundings (in e.g. bat).

True hibernators tend to be mid-sized animals as these can have sufficient food reserves without too large a surface area for heat loss. Bears are not true hibernators as their body temperature does not drop and they are able to awake from their winter ‘sleep’ very quickly. In temperate situations, rises in temperature may cause some animals temporarily to come out of hibernation. Compare AESTIVATION (1).

References in periodicals archive ?
Caption: Garter snakes will sometimes hibernate in dens with hundreds or thousands of other garters for additional insulation from the cold, emerging in the spring and forming "snake balls" before disbursing for the summer.
In 2005-2006, 2010-2011, 2011-2012, and 2012-2013 we placed data loggers both inside and under the outer bark of 1 of the study trees (SI #1) to assess whether a bat could hibernate under the bark.
In order to offer full compatibility with all major platforms we used in the proposed architecture the Java Sun technology and Hibernate from JBoss Community, although other tools were available too, for database integration.
Massive bears hibernate much differently than smaller animals, like woodchucks and squirrels.
The much larger population of big brown bats - those that commonly hibernate in the attics of homes and in other buildings - are not yet known to be affected, according to French.
For reasons scientists cannot yet explain, bears can hibernate for months without losing strength in their bones and muscles.
Why can't Blair sort it out so we can all hibernate for January of each year at the very least?
The EIMS software comes with four idle control settings: hibernate mode, work mode, low-voltage mode and warm-up mode.
Chapters instruct the reader in how to unit test an application for function, performance, and coverage; how to make an application secure; how to integrate with Hibernate; dealing with exceptions; generating alternative views with PDF and XSL; how to design a layered Struts application; and much more.
A new unique Hibernate mode offers two levels of power reduction--a simple stand-by mode allowing up to 68% lower quiescent power, and an active power management mode for up to 98% lower quiescent power (below 6mA for the XC3S1000L and below 8mA for the XC3S1500L) than comparable Spartan-3 devices.
They will now have a specially- constructed new chimney and cellar in which to hibernate.
Silver-haired bat, Lasionycteris noctivagans.--A few silver-haired bats hibernate in caves in Indiana, but otherwise silver-haired bats are found in Indiana only during spring and fall migrations (March through early June; and late September through November).