- 行业: Printing & publishing
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McGraw Hill Financial, Inc. is an American publicly traded corporation headquartered in Rockefeller Center in New York City. Its primary areas of business are financial, publishing, and business services.
A specialized cellular protein that binds nonnative forms of other proteins and assists them to reach a functional conformation, in most cases through the expenditure of adenosine triphosphate (ATP). Originally identified by their increased abundance after heat shock, chaperone proteins in general bind to exposed hydrophobic surfaces of nonnative proteins, preventing them from forming intermolecular interactions that lead to irreversible multimolecular aggregation. Thus, the role of chaperone proteins under conditions of stress, such as heat shock, is to protect proteins by binding to incipiently misfolded conformations, preventing aggregation; then, following return of normal conditions, they allow refolding to occur, associated with protein release.
Industry:Science
A specialized gland located around the eyes and nasal passages in marine turtles, snakes, and lizards, and in birds such as the petrels, gulls, and albatrosses, which spend much time at sea. Salt glands are compound tubular glands which apparently arise as invaginations of the epithelium of the nasal passage or from the developing conjunctival sac of the eye. In the marine turtle it is an accessory lacrimal gland which opens into the conjunctival sac. In seagoing birds and in marine lizards it opens into the nasal passageway. Salt glands copiously secrete a watery fluid containing a high percentage of salt, higher than the salt content of urine in these species. As a consequence, these animals are able to drink salt-laden seawater without experiencing the dehydration necessary to eliminate the excess salt via the kidney route.
Industry:Science
A specialized keratinous outgrowth of the skin, which is a unique characteristic of birds. Feathers are highly complex structures that provide insulation, protection against mechanical damage, protective coloration, and also function significantly in behavior. One special functional role is in flight, where feathers provide propulsive surfaces and a body surface aerodynamically suitable for flight. Feathers are used in maintenance of balance and occasionally in the capture of prey and various specialized displays.
Industry:Science
A specialized order of branchiopod crustaceans formerly included in the order Cladocera. The body is up to about 12 mm (0.5 in.) in length, but much of the length of the longest species is made up by a caudal process.
Industry:Science
A specialized skin gland of the tubuloalveolar or acinous variety found in many mammals. These glands produce substances having peculiar odors. In some instances they are large, in others small. Examples of large glands are the civet gland in the civet cat, the musk gland in the musk deer, and the castoreum gland in the beaver. The civet gland is an anal gland, whereas the musk and castoreum are preputial. Examples of small scent glands are the preputial or Tyson's glands in the human male which secrete the smegma, and the vulval glands in the female. The secretions in all of the above glands are sebaceous.
Industry:Science
A specially equipped pressure vessel used in medicine and physiological research to administer oxygen at elevated pressures.
Industry:Science
A species of atom that is characterized by the constitution of its nucleus, in particular by its atomic number <i>Z</i> and its neutron number <i>A – Z</i>, where <i>A</i> is the mass number. Whereas the terms isotope, isotone, and isobar refer to families of atomic species possessing common atomic number, neutron number, and mass number, respectively, the term nuclide refers to a particular atomic species. The total number of stable nuclides is approximately 275. About a dozen radioactive nuclides are found in nature, and in addition, hundreds of others have been created artificially.
Industry:Science
A species of deciduous tree, <i>Ficus caria</i>, of the mulberry family (Moracaeae). Leaves are characteristically palmate, with 3 to 7 lobes. A milky latex containing the protein-digesting enyzme ficin is produced. It is of southwest Asian origin and is now cultivated in the subtropical regions of the world for its edible fruit, especially in Asia, Africa, Europe, and the United States.
Industry:Science
A species that is in danger of extinction throughout all or a significant portion of its range. “Threatened species” is a related term, referring to a species likely to become endangered within the foreseeable future.
Industry:Science
A specific pattern of leg pain that follows the course of the sciatic nerves. It is usually caused by injury to one or more of the sciatic root nerves within the lower spinal canal. The contributing nerves, the last two lumbar and first two sacral, exit sequentially through openings on each side of the spine. The individual nerves then enter common protective sheaths to become the sciatic nerves. Each one leaves the pelvis and runs down the back of the leg to the foot. Along the way branches supply the skin, particularly in the lower leg, and some of the muscles that move the hip and bend the knee. The sciatic nerves control all the muscles that enable walking on the heels and toes.
Industry:Science
