As a result of recent advances in access to antiretroviral therapy ARTHIV-positive people now live longer and healthier lives. Progress has also been made in preventing and eliminating mother-to-child transmission and keeping mothers alive. In8 out of 10 pregnant women living with HIV, or 1.
The polar bear digs a den in the snow, whereas grizzlies build large mounds of dirt in front of their dens.
Bears, however, lack the physiological characteristics lower heart rate, body temperature, breathing rate, and blood pressure exhibited by animals that truly hibernate. Asiatic black bear Ursus thibetanus. American black bear Ursus americanus. Leonard Lee Rue III Male polar bears sometimes aggregate; otherwise bears are solitary, except during the mating season.
Then they tend to congregate, pair off, and mate in seclusion. The male leaves the female soon after mating and plays no role in raising the young. Gestation periods vary, the fertilized egg remaining dormant in the uterus delayed implantationwhich ensures the birth of young while the female is in the winter den and guarantees that the cubs will emerge from the den in the spring, when food is abundant.
Ursids breed once per year at most, and many bears breed only every two to four years. The breeding season is usually in late spring or early summer.
Delayed implantation results in most births occurring in January or February.
Newborn bears weigh about half a kilogram one pound and are about 23 cm 9 inches long from the nose to the tip of the short tail. Twins are most common in bears, but up to five young may be produced. The cubs nurse for a few months and stay with the female until the next breeding about a year and a half or more after birth.
Most young, however, can get along on their own by about six months of age. Bears reach breeding condition at three and a half to six years of age, males usually maturing later than females.
Longevity of bears in the wild ranges from 15 to 30 years, but in captivity they can live considerably longer. Most mortality occurs because of hunting by humans.
On occasion, bears that fail to accumulate enough fat to last throughout the winter may die of starvation. Young bears are more vulnerable to predation because of their smaller size and thus may be killed by other carnivores such as wolves or cougar s but most importantly by other bears, especially males.
For this reason, females with cubs are highly protective of their young in the vicinity of males.
Home ranges occupied by individual bears vary in size depending on the abundance of food, and larger areas are used when food is in short supply. Although highly variable among geographic areas and even among seasons, American black bears roam areas of 40 to square km 15 to 77 square milesgrizzlies about — square km.
Some polar bears trek across ranges of more thansquare km 48, square miles. This has often caused people to consider bears as tame and harmless rather than as potentially dangerous creatures deserving wariness and respect.
This mistake has frequently resulted in tragedy for both humans and bears. Grizzly and polar bears are the most dangerous, but Eurasian brown bears and American black bears have also been known to attack humans. Some species depredate livestock on occasion, and some ursids, such as Asiatic and American black bears, may destroy fruit or other crops, especially corn.
Kodiak bears are the largest living land carnivores. Fish and Wildlife Service The pelts of bears have been used for a number of purposes. Perhaps most popular has been the bearskin rug. Skins also have been used for fashionable articles of clothing.
The meat of black and polar bears often is consumed. The gall bladders of Asian bears are greatly valued in Asia for pharmaceutical purposes.Description of Omega-3’s and Their Role in Human Health (commonly associated with liver diseases, alcoholism, chemotherapy, steroid use, AIDS, diabetes and/or routine use of antacids) not to eat raw animal products like meat, poultry, shellfish like oysters and clams, and eggs which may contain potentially harmful viruses or bacteria for.
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ISOLATED FACTS ABOUT HIV - A REPLY The latter is a description of a type A, retroviral particle . Chermann JC, Rey F. Isolation of a T-Lymphotrophic Retrovirus from a patient at Risk for Acquired Immune Deficiency Syndrome (AIDS).
Science ; Klatzmann D, Barr‚-Sinoussi F, Nugeyre MT. AIDS, or acquired immune deficiency syndrome, is a disorder that is caused by infection with the human immunodeficiency virus, or HIV. This virus attaches to the surface of specific white blood cells called T cells and is therefore able to reproduce and continue production of the virus.
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