- 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.
Most cells of the human body typically contain DNA having about 6,000,000,000 base pairs, which would measure nearly 2 m in length if stretched out end to end. Yet this genomic DNA is packaged into cellular nuclei that are roughly 10 micrometers, or 0.00001 m, in width. This remarkable compaction is aided by the wrapping of the genome into a complex between DNA and proteins known as “chromatin.”
Industry:Science
Processes that involve making chemical changes to materials, as a result of chemical reaction taking place. For instance, in the combustion of coal, the entering and leaving materials differ from each other chemically: coal and air enter, and flue gases and residues leave the combustion chamber. Combustion is therefore a unit process. Unit processes are also referred to as chemical conversions.
Industry:Science
River engineering involves the control and utilization of rivers for the benefit of humankind. Its scope, in the broad sense, may include river training, channel design, flood control, water supply, navigation improvement, hydraulic structure design, hazard mitigation, and environmental enhancement. River engineering is also necessary to provide protection against floods and other river disasters.
Industry:Science
One of the three living orders of class Amphibia, encompassing the frogs and toads. Anurans differ most obviously from salamanders (order Caudata) in lacking a tail. Usually, frogs and toads have long hindlimbs adapted for the hopping locomotion characteristic of members of the order. There can be no confusion of anurans with the limbless caecilians, members of the third order of amphibians, Apoda.
Industry:Science
Methods of joining the individual members of a structure to form a complete assembly. The connections furnish supporting reactions and transfer loads from one member to another. Loads are transferred by fasteners (rivets, bolts) or welding supplemented by suitable arrangements of plates, angles, or other structural shapes. When the end of a member must be free to rotate, a pinned connection is used.
Industry:Science
Modern medical practice depends on sophisticated chemical analyses of body fluids—most commonly blood plasma, but also urine, cerebrospinal fluid, and many others. Substances measured range from the major plasma constituents, such as water, sodium chloride, and albumin, to various metabolites, proteins, and exogenous agents that may exert biological effects at concentrations of one part per trillion.
Industry:Science
Over the past century, petroleum-based products gradually replaced similar products that were once made from plants. However, now a wide variety of fuels, chemicals, lubricants, adhesives, plastics, and other materials derived from renewable plant resources are being substituted for petroleum-based products. Economic, technical, environmental, social, and political forces are driving this transition.
Industry:Science
Our dependence on computers, networks, and the Internet has grown at a fast pace, as evidenced by the increasing number of applications, as well as computer supervisory control of power, telecommunication, and transportation systems. In their current state, computers and networks are neither secure nor dependable for protecting stored or transmitted information or delivering a desired level of quality.
Industry:Science
One of the geomorphological expressions between two tectonic plates that are opening relative to each other or sliding past each other. The term originally was used to describe the central graben structures of such classic continental rift zones as the Rhinegraben and the East African Rift, but the definition now encompasses mid-oceanic ridge systems with central valleys such as the Mid-Atlantic Ridge.
Industry:Science
Mechanisms for raising and lowering material with intermittent motion while holding the material freely suspended. Hoisting machines are capable of picking up loads at one location and depositing them at another anywhere within a limited area. In contrast, elevating machines move their loads only in a fixed vertical path, and monorails operate on a fixed horizontal path rather than over a limited area.
Industry:Science
