- 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.
Plant viruses are pathogens which are composed mainly of a nucleic acid (genome) normally surrounded by a protein shell (coat); they replicate only in compatible cells, usually with the induction of symptoms in the affected plant. Viroids are among the smallest infections agents known. Their circular, single-stranded ribonucleic acid (RNA) molecule is less than one-tenth the size of the smallest viruses.
Industry:Science
In the United States and across the world, obesity has increased at a startling rate over the past three decades. This sharp increase in obesity rates has led the media and some scientists to label it the “obesity epidemic.” Currently, obesity is among the most serious health problems in the United States—the Centers for Disease Control list it as the second leading cause of preventable deaths in America.
Industry:Science
One of a group of organic chemical compounds of general formula RC≡N. A nitrile is named from the acid to which it can be hydrolyzed by adding the suffix -onitrile to the acid stem, for example, acetonitrile from acetic acid. An alternative system names the group attached to CN, thus CH<sub>3</sub>CN is also named methyl cyanide. In more complex structures the CN group is named as a substituent, cyano.
Industry:Science
One of the group of minerals referred to as evaporites, halite is commonly known as salt. Halite is one of many substances that are essential for human life. Evaporite minerals form when ions are concentrated to their saturation point by the progressive evaporation of seawater or saline lake water. Halite precipitates after calcium sulfate, but before the highly soluble salts of potassium and magnesium.
Industry:Science
One of the two recognized superorders of living birds that comprise the subclass Neornithes of the class Aves. The Neognathae are characterized as flying birds with the absence of teeth in both jaws, fully developed wings, keeled bony sternum, strong synsacrum fused with the pelvic girdle, and caudal vertebrae fused into a pygostyle; modifications in these conditions occurred in secondary flightless birds.
Industry:Science
Raising of cattle for meat. The muscle from cattle over 6 months of age is beef and from younger cattle, veal. Beef is a highly nutritious food, containing approximately 20% protein; it is rich in essential amino acids and minerals, and is a good source of the B vitamins (B<sub>6</sub>, B<sub>12</sub>, niacin, and riboflavin). Beef also supplies a generous portion of the daily dietary iron requirements.
Industry:Science
Means of providing propulsive power for flight to the Moon or to a planet. A variety of different propulsion systems can be used. The space vehicles for these missions consist of a series of separate stages, each with its own set of propulsion systems. When the propellants of a given stage have been expended, the stage is jettisoned to prevent its mass from needlessly adding to the inertia of the vehicle.
Industry:Science
Neutrino astronomy involves the detection of neutrinos from the Sun and from extrasolar astronomical sources. Except for the historic neutrino burst from Supernova 1987A, no signal of extrasolar neutrinos has been detected so far. Neutrinos are also produced locally by the interaction of primary cosmic rays with the atmosphere. This article focuses on neutrino astrophysics with the Super-Kamiokande detector.
Industry:Science
Light pollution, or sky glow, is the excessive brightness of the sky (especially the night sky) caused by artificial light sources on the ground. In addition to obscuring naked-eye viewing of the stars from Earth, light pollution has a significant adverse effect on observational ground-based astronomy, which relies on discerning extremely distant, faint light sources against a background of lesser brightness.
Industry:Science
One of a number of ceramic materials for use in high-temperature structures or equipment. The term high temperatures is somewhat indefinite but usually means above about 1800°F (1000°C), or temperatures at which, because of melting or oxidation, the common metals cannot be used. In some special high-temperature applications, the so-called refractory metals such as tungsten, molybdenum, and tantalum are used.
Industry:Science
