- 行业: Printing & publishing
- Number of terms: 178089
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- Company Profile:
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.
The nose is a chemical detector. It houses the olfactory sensory neurons (OSNs), which are specialized cells that display on their surface genomically encoded protein receptors that have evolved to respond to airborne odorant molecules. In 1991, these protein receptors, now known as the olfactory receptors (ORs), were identified by Linda Buck and Richard Axel as belonging to a class of well-known proteins, the G-protein-coupled receptors (GPCRs). (GPCRs are dependent on guanosine triphosphate (GTP) for their function; in the nonstimulated state, these receptors are bound to a complex of three different proteins (a heterotrimer), named alpha (α), beta (β), and gamma (γ), which together constitute the G-protein.)
Industry:Science
The southernmost of the New World or Western Hemisphere continents, with three-fourths of it lying within the tropics. South America is approximately 4500 mi (7200 km) long and at its greatest width 3000 mi (4800 km). Its area is estimated to be about 7,000,000 mi<sup>2</sup> (18,000,000 km<sup>2</sup>). South America has many unique physical features, such as the Earth's longest north-south mountain range (the Andes), highest waterfall (Angel Falls), highest navigable fresh-water lake (Lake Titicaca), and largest expanse of tropical rainforest (Amazonia). The western side of the continent has a deep subduction trench offshore, whereas the eastern continental shelf is more gently sloping and relatively shallow.
Industry:Science
The process by which seriously disturbed land surfaces are stabilized against the hazards of water and wind erosion. All seriously disturbed land areas are in need of reclamation and should be stabilized and reclaimed as quickly as possible after disturbance. Disturbance comes from major construction projects such as interstate highway systems, shopping centers, and housing developments, and from surface mining operations for coal, stone, gravel, gold, phosphate, iron, uranium, and clay. Surface mining for coal is responsible for almost one-half of the total land area disturbed in the United States, another one-fourth is from sand and gravel, and the remainder is from mining of other materials and construction.
Industry:Science
The process of producing the illusion of a moving picture. Cinematography includes two phases: taking the picture with a camera and showing the picture with a projector. The camera captures the action by taking a series of still pictures at regular intervals; the projector flashes these pictures on a screen at the same frequency, thus producing an image on the screen that appears to move. This illusion is possible because of the persistence of vision of the human eye. The still pictures appear on the screen many times a second, and although the screen is dark equally as long as it is lighted by the projected image, they do not seem to be a series of pictures but appear to the viewer to be one continuous picture.
Industry:Science
The name given by F. Buchanan in 1807 to the iron-rich weathering product of basalt in southern India. The term is now used in a compositional sense for weathering products composed principally of the oxides and hydrous oxides of iron, aluminum, titanium, and manganese. Iron-rich or ferruginous laterite is largely hematite, Fe<sub>2</sub>O<sub>3</sub>, and goethite, HFeO<sub>2</sub>, and may be an ore of iron and nickel (Cuba, New Caledonia). Aluminous laterite is composed of gibbsite and boehmite, and is the principal ore of aluminum. Clay minerals of the kaolin group are typically associated with, and are genetically related to, laterite. Laterites range from soft, earthy, porous material to hard, dense rock.
Industry:Science
The process of producing a separable solid phase within a liquid medium. In a broad sense, precipitation represents the formation of a new condensed phase, although other terms are often used to describe the process. Thus (1) a vapor or gas condenses to liquid droplets, or more specifically as in meteorology, water vapor in the atmosphere precipitates to form rain, snow, or ice; (2) a substance in the liquid state freezes or solidifies; (3) a dissolved component crystallizes from a supersaturated solution; (4) a new solid phase gradually precipitates within a solid alloy as the result of a slow, inner chemical reaction; or (5) a metal electrodeposits upon the passage of an electrical current through a solution.
Industry:Science
The removal of radioactive contamination which is deposited on surfaces or spread throughout a work area. Personnel decontamination is included. Radioactive contamination is a potential health hazard and, in addition, may interfere with the normal operation of plants, particularly when radiation detection instruments are used for control purposes. Thus, the purpose of decontamination is the detection and removal of radioactive contaminants from unwanted locations to locations where they do not create a health hazard or interfere with plant operation. The objective of a good decontamination operation is to remove the radioactive contamination permanently from the human environment, with minimum radiation exposure.
Industry:Science
The perception of sound by animals through specialized sense organs. A sense of hearing is possessed by animals belonging to two divisions of the animal kingdom: the vertebrates, which form the main subphylum of the phylum Chordata, and the insects, which make up the most important class of the phylum Arthropoda. The sense is mediated by the ear, a specialized organ for the reception of vibratory stimuli. Such an organ is found in all except the most primitive vertebrates, but only in some of the many species of insects. The vertebrate and insect types of ear differ in evolutionary origin and in their modes of operation, but both have attained high levels of performance in the reception and discrimination of sounds.
Industry:Science
The science that deals with knowledge of animal life. Together with botany, the science of plants, it forms biology, the science of living things. With the great growth of information about animals, zoology has been much subdivided. Some major fields are anatomy, which deals with gross and microscopic structure; physiology, with living processes in animals; embryology, with development of new individuals; genetics, with heredity and variation; parasitology, with animals living in or on others; natural history, with life and behavior in nature; ecology, with the relation of animals to their environments; evolution, with the origin and differentiation of animal life; and taxonomy, with the classification of animals.
Industry:Science
The measurement of charge-to-mass ratios of electrically charged particles from the frequency of their helical motion in a magnetic field. Such experiments are particularly useful in the case of conducting crystals, such as semiconductors and metals, in which the motions of electrons and holes are strongly influenced by the periodic potential of the lattice through which they move. Under such circumstances the electrical carriers often have “effective masses” which differ greatly from the mass in free space; the effective mass is often different for motion in different directions in the crystal. Cyclotron resonance is also observed in gaseous plasma discharges and is the basis for a class of particle accelerators.
Industry:Science
