- 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 original definition of an antibiotic was a chemical substance that is produced by a microorganism and, in dilute solutions, can inhibit the growth of, and even destroy, other microorganisms. This definition has been expanded to include similar inhibitory substances that are produced by plants, marine organisms, and total- or semi-synthetic procedures.
Industry:Science
The name for two species of even-toed (artiodactylid) ungulates which form the family Hippopotamidae. Both species occur in Africa; the great African hippopotamus (<i>Hippopotamus amphibius</i>) inhabits the rivers of tropical Africa, and the pygmy hippopotamus (<i>Choeropsis liberiensis</i>) lives near the rivers of western Africa but is more terrestrial.
Industry:Science
The science of measuring the size, shape, and gravity field of the Earth. Geodesy supplies positioning information about locations on the Earth, and this information is used in a variety of applications, including civil engineering, boundary demarcations, navigation, resource management and exploration, and geophysical studies of the dynamics of the Earth.
Industry:Science
The parrots, a large order of land birds found worldwide but with most species concentrated on the landmasses of the Southern Hemisphere, particularly Australasia, the Neotropics, Africa, and southern Asia. Only a few species are found in the northern temperate regions. The parrots likely are closely allied to pigeons, from which they have probably evolved.
Industry:Science
The splitting which a wavefront experiences when a wave disturbance is propagated in an anisotropic material; also called double refraction. In anisotropic substances the velocity of a wave is a function of a displacement direction. Although the term birefringence could apply to tranverse elastic waves, it is usually applied only to electromagnetic waves.
Industry:Science
The third oldest of the seven geological epochs of the Cenozoic Era. It corresponds to an interval of geological time (and rocks deposited during that time) from the close of the Eocene Epoch to the beginning of the Miocene Epoch. The most recent geological time scales assign an age of 34 to 24 million years before present (m.y. B.P.) to the Oligocene Epoch.
Industry:Science
The period during which a developing fetus is carried within the uterus. In humans, pregnancy averages 266 days (38 weeks) from conception to childbirth. Traditionally, pregnancy duration is counted from the woman's last menstrual period, which adds roughly 2 weeks to gestational age. This is how physicians arrive at a pregnancy length of 40 weeks (280 days).
Industry:Science
The science of sound in the atmosphere. Atmospheric acoustics is concerned with sound outdoors rather than indoors. The atmosphere has a structure that varies in both space and time, and these variations have significant effects on a propagating sound wave. In addition, when sound propagates close to the ground, the type of ground surface has a strong effect.
Industry:Science
The spectroscopic study of the interaction of matter with infrared radiation. Electromagnetic waves from the long-wavelength limit of visible light at 800 nanometers to the shortest microwaves at 1 mm are used. In the wave-number units usually employed (oscillations per centimeter, read as reciprocal centimeters), this corresponds to 12,500–10 cm<sup>−1</sup>.
Industry:Science
The name for about 80 species of small-to-medium-sized lizards that comprise the family Chamaeleontidae and occur mainly in Africa and Madagascar. The American chameleons (<i>Anolis</i>) belong to a different family of lizards, the Iguanidae. This reptile is insectivorous and beneficial to humans. It commonly is found on vegetation, especially the green parts.
Industry:Science
