- 行业: Printing & publishing
- Number of terms: 178089
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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 localized, abnormal arterial dilation usually caused by a weakening of the vessel wall. Aneurysms are commonly found in the abdominal aorta, intracranial arteries, and thoracic aorta; however, they may also involve the femoral, popliteal, splenic, carotid, or renal arteries. Aneurysms vary in size from less than 1 in. (2–3 cm) to more than 4 in. (10 cm). They are usually classified as true or false: true aneurysms involve all layers of the artery (inner endothelium or intima, middle muscular layer or media, and outer connective tissue or adventitia); false aneurysms do not involve all layers. With the exception of intracranial aneurysms, atherosclerotic vessel disease is generally the cause of aneurysms; other causes include syphilis, trauma, cystic medial necrosis, bacterial infections, and arteritis.
Industry:Science
A logarithmic unit used to express the magnitude of a change in level of power, voltage, current, or sound intensity. A decibel (dB) is 1/√<span style="border-top:1px solid black;">10</span> bel.
Industry:Science
A long flexible structure consisting of many strands of wire, plastic, or vegetable fiber such as manila. Rope is classified as a flexible connector and is used generally for hoisting, conveying, or transporting loads; transmitting motion; and occasionally transmitting power. For flexibility and to reduce stresses as the rope bends over the sheave (pulley), a rope is made of many small strands.
Industry:Science
A long line of cliffs or steep slopes that break the general continuity of the land by separating it into two level or sloping surfaces. Some very high escarpments, or scarps, may form by vertical movement along faults. Often a whole block of land may be forced upward while the adjacent block is downfaulted. Such scarps are common in the tilted fault-block mountains of eastern California, Nevada and western Utah. In eastern Africa, prominent fault scarps mark the margins of the great rift valleys, whose floors are downfaulted by as much as 8200 ft (2500 m).
Industry:Science
A long, narrow, characteristically very deep and asymmetrical depression of the sea floor, with relatively steep sides. Oceanic trenches characterize active margins at the ocean-basin–continent or ocean-basin–island-arc boundaries. They contain the greatest oceanic depths and are associated with the most active volcanism, largest negative gravity anomalies, most frequent shallow seismicity, and almost all of the intermediate and deep-focus earthquake activity. As the surface expression of the widely accepted process of subduction by which oceanic crustal material is returned to the upper mantle, they are key elements in current models of plate tectonic evolution on Earth and possibly on Venus.
Industry:Science
A long-keeping cultivar of muskmelon, <i>Cucumis melo inodorus</i>, of the gourd family, Cucurbitaceae (see <b>illus.</b>).
Industry:Science
A long-lived perennial (<i>Cynodon</i> spp.) that originated in Africa. It is believed that in the early 1500s Spanish explorers unintentionally brought the first common Bermuda grass seeds to the Western Hemisphere with the hay that fed their horses. The weedy common type, <i>C. dactylon</i> (the type species), can now be found throughout the tropical and subtropical regions of the world.
Industry:Science
A long-season cultivar of muskmelon, <i>Cucumis melo</i>, of the gourd family, Cucurbitaceae. The fruit is 7–10 in. (18–25 cm) in diameter, weighs 6–8 lb (2.7–3.6 kg), and is round and without sutures; it has dark-green skin and thin, abundant netting. The flesh is deep orange, very thick and firm, and distinctly sweet in flavor. The fruit separates from the stem at full maturity and soon becomes overripe. Plants are large and vigorous with large leaves. The vines usually bear andromonoecious flowers, and pollination is performed by bees. Persian melons require a long frost-free growing season of about 115 days. Average growing temperatures of 70–75°F (21–24°C) are preferred. Fruits are about 90% water and contain 7.5 g of carbohydrate per 100 g of tissue. The flesh is very rich in potassium, vitamin A, and vitamin C.
Industry:Science
A loose grouping of acoelomate, parasitic flatworms of the phylum Platyhelminthes formerly accorded class rank and containing the subclasses (or orders) Digenea, Monogenea, and Aspidobothria. Although neither the name Trematoda nor the classification scheme appears as valid as formerly in demonstrating helminth phylogenetic relationships (in light of recent information, covered in the Taxonomy section below), a discussion of the three older “trematode” groups just mentioned is profitable. These organisms commonly occur as adults in or on all vertebrate groups. They exhibit cephalization, bilateral symmetry, and well-developed anterior and ventral, or anterior and posterior, holdfast structures. Electron-microscope studies of some parasitic platyhelminths by D. L. Lee in 1966 and K. M. Lyons in 1970 indicate that the outer covering of these worms, once thought to be a secreted, nonliving cuticle, is probably a living epidermis. The mouth is anterior, and usually a blind, forked gut occurs, as well as three muscle layers. The excretory system consists of flame cells and collecting tubules. These animals are predominantly hermaphroditic and oviparous with operculated egg capsules. The life histories of the Digenea are complex, while those of the Monogenea and Aspidobothria are simple.
Industry:Science
A loosely defined region in southeast Asia broadly comprising former colonial possessions of European nations and now forming the countries of Malaysia, Brunei, and Indonesia. The islands of the East Indies extend for about 2800 mi (4500 km) from western Sumatra to New Guinea. They form part of a region of great geological and biological diversity.
Industry:Science
