- 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 molecular weight of an element or compound expressed in grams (g), that is, the molecular weight on a scale on which the atomic weight of the <sup>12</sup>C isotope of carbon is taken as 12 exactly. This replaces the earlier scale on which the atomic weight of oxygen was taken as 16.00 g. In the International System of Units, gram-molecular weight is replaced by the mole.
Industry:Science
The name applied to the last period of geologic time in the Paleozoic Era and to the corresponding system of rock formations that originated during that period. The Permian Period commenced approximately 290 million years ago and ceased about 250 million years ago. The system of rocks that originated during this interval of time is widely distributed on all the continents of the world.
Industry:Science
The sum of all external factors, both biotic (living) and abiotic (nonliving), to which an organism is exposed. Biotic factors include influences by members of the same and other species on the development and survival of the individual. Primary abiotic factors are light, temperature, water, atmospheric gases, and ionizing radiation, influencing the form and function of the individual.
Industry:Science
The practice of obtaining surveys by means of photography. The camera commonly is airborne with its axis vertical, but oblique and horizontal (ground-based) photographs also are applicable. Many industrial and laboratory measurement problems are solved by photogrammetry. Data reduction is accomplished by stereoscopic line-of-sight geometry with use of both analytical and analog methods.
Industry:Science
The name given a group of degenerative diseases of arteries characterized by thickening and hardening of their walls. The group includes three types of lesions: (1) atherosclerosis involves the aorta and its major branches; (2) medial sclerosis involves the muscular arteries of the legs; and (3) arteriolosclerosis involves the small branches of the arterial tree, called the arterioles.
Industry:Science
The processes for reproducing text and images using ink on paper. These include all the processes from typesetting through finishing of the printed product. Prepress operations for conventional plate processes consist of layout and design, typesetting, and platemaking. Traditionally, these were manual labor-intensive operations, but now most are digital, using desktop publishing systems.
Industry:Science
The microscope allows the observation of single cells, the building blocks of life. Since its invention, the resolution, and particularly the contrast, of the instrument has been continually refined. During most of its evolution, however, the microscopist has remained a passive observer. With the recent development of optical manipulation techniques, this situation has completely changed.
Industry:Science
The third brightest star in the sky, apparent magnitude −0.3, and the brightest in the southern constellation Centaurus. It is the closest star to the Sun at a distance of 1.35 parsecs 2.59 X 10<sup>13</sup> mi (or 4.16 X 10<sup>13</sup> km), and its light takes more than 4 years to reach the Earth. It has an unusually large proper motion across the sky of 3.7 seconds of arc per year.
Industry:Science
The process by which a cell increases the copy number of a particular gene to a greater extent than it increases the copy number of genes composing the remainder of the genome (all the genes that make up the genetic machinery of an organism). It is therefore distinguished from the precise doubling of the genome preparatory to cell division, and endoreduplication, which leads to polyploidy.
Industry:Science
The sweet orange (<i>Citrus sinensis</i>) is the most widely used species of citrus fruit and commercially is the most important. The sour or bitter oranges, of lesser importance, are distinct from sweet oranges and are classified as a separate species, <i>C. aurantium</i>. Citrus belonging to other species are also sometimes called oranges. This article deals only with the sweet orange.
Industry:Science
