- 行业: Printing & publishing
- Number of terms: 178089
- Number of blossaries: 0
- 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.
A simple marine worm whose natural habitat is in soft mud bottoms at a depth of around 60 m (200 ft) off the coasts of Sweden and Norway. <i>Xenoturbella</i> was first discovered in 1915 by the Swedish biologist Sixten Bock, but was not described until 30 years later by Einar Westblad. Due to its simplicity of form, Westblad initially classified <i>Xenoturbella</i> as a primitive turbellarian, a class of ciliated nonparasitic flatworms, and named it accordingly (<i>Xenoturbella</i> = strange flatworm). However, recent analyses using deoxyribonucleic acid (DNA) have found <i>Xenoturbella</i> to be a primitive member of the deuterostomes, the group of animals that includes the vertebrates.
Industry:Science
A simple rolled steel section used as an isolated structural element, as a support of other structural elements, or as part of other structural elements.
Industry:Science
A simple sac or cavity with smooth walls and containing a clear, slightly sticky fluid interposed between two moving surfaces of the body to reduce friction. Subcutaneous bursae are found where the skin stretches around the greater curvature of a joint, as in the elbow or knee, and considerable chafing may occur; they may be single or multiple sacs. These bursae may enlarge as a result of continuous excessive irritation, as in housemaid's knee or miner's elbow.
Industry:Science
A simple sugar, or monosaccharide, with the chemical formula C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>; also called dextrose, glucopyranose, grape sugar, and corn sugar.
Industry:Science
A simple, unlearned, yet specific behavioral response to a specific stimulus. Reflexes are exhibited by virtually all animals from protozoa to primates. Along with other, more complex stimulus-bound responses such as fixed action patterns, they constitute much of the behavioral repertoire of invertebrates. In higher animals, such as primates, where learned behavior dominates, reflexes nevertheless persist as an important component of total behavior.
Industry:Science
A simplified chemical reaction method recognized in 2001 by a group led by Nobel Laureate Prof. K. Barry Sharpless at the Scripps Research Institute. “Click” is meant to signify that joining molecular pieces is as easy as clicking together the two pieces of a buckle. The buckle works no matter what is attached to it, as long as its two pieces can reach each other and the components of the buckle can make a connection only with each other. Click reactions are easy to perform, give rise to their intended products in very high yields with little or no by-products, work well under many conditions (usually especially well in water), and are unaffected by the nature of the groups being connected to each other.
Industry:Science
A single species, <i>Phascolarctos cinereus</i>, which is a member of the family Phalangeridae in the mammalian order Marsupialia (pouch-bearing animals). It is a small, clean, affectionate animal that weighs from 11 to 17 lb (5 to 8 kg) when mature. Koalas are restricted to eastern Australia, where the eucalyptus grows. Not only do they have a specialized diet of eucalyptus leaves, but the leaves must be of a certain age from a specific species of tree, and the tree must grow upon a certain type of soil. Each adult will eat an average of 2–3 lb (0.9–1.5 kg) of leaves each day. While the diet is a definite limiting factor to an increase in the population, millions died from epidemic diseases at the turn of the twentieth century, and later thousands were killed for their fur. These animals are now strictly protected by the Australian government because their numbers are small. Exportation is prohibited.
Industry:Science
A single, large, living, female sex cell enclosed in a porous, calcareous shell through which gases may pass. Although they vary in size, shape, and color, the eggs of chickens, ducks, geese, and turkeys are essentially the same in structure and content (see <b>illus.</b>). Inward from the shell are the outer and inner shell membranes which are also permeable to gases. The membranes are constructed to prevent rapid evaporation of moisture from the egg but to allow free entry of oxygen, which is necessary for life. Air begins to penetrate the shell soon after the egg is laid, and it tends to accumulate in a space between the two membranes at the large end of the egg.
Industry:Science
A single-story, watertight, on-site treatment system for domestic sewage, consisting of one or more compartments, in which the sanitary flow is detained to permit concurrent sedimentation and sludge digestion. The septic tank is constructed of materials not subject to decay, corrosion, or decomposition, such as precast concrete, reinforced concrete, concrete block, or reinforced resin and fiberglass. The tank must be structurally capable of supporting imposed soil and liquid loads. Septic tanks are used primarily for individual residences, isolated institutions, and commercial complexes such as schools, prisons, malls, fairgrounds, summer theaters, parks, or recreational facilities. Septic tanks have limited use in urban areas where sewers and municipal treatment plants exist.
Industry:Science
A single-stranded short polymer of deoxyribonucleic acid (DNA) or ribonucleic acid (RNA). Although the number of nucleic acid monomers (known as nucleotides) in the polymer varies widely, practical uses for oligonucleotides ranging in size from 4 to over 100 monomers have been reported.
Industry:Science
