- 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.
An arthropod-borne disease of ruminant species. Its geographic distribution is dependent upon a susceptible ruminant population and climatic conditions that favor breeding of the primary vector, a mosquito (<i>Culicoides</i> species).
Industry:Science
An arthropod-borne infection caused by the bacterium <i>Bartonella bacilliformis</i>. The disease, also known as Carrión's disease, is confined to South America. It is characterized by two distinct clinical forms, Oroya fever and verruga peruana. Oroya fever causes a high temperature accompanied by the destruction of red blood cells; verruga peruana is a benign, nodular wart that develops on the surface of the skin.
Industry:Science
An artificial class of fungi in the phylum Basidiomycota in which basidiospores are produced in a mass (gleba) and enclosed within a membrane called the peridium. Such enclosed fruit bodies evolved many times; hence the class is heterogeneous. Most Gasteromycetes have lost the ability to discharge spores ballistically off basidia directly into air. Since internal sporulation prevents normal spore drop into air currents, these fungi have developed other dispersal mechanisms. Puffballs (Lycoperdales) typically form powdery spores in a perforated peridium that acts like a bellows when hit by rain. Earthstars (<i>Geastrum</i>) disperse similarly, but the peridia are elevated on arched rays. <i>Bovista</i> scatters spores while tumbling in the wind; <i>Calvatia</i> cracks open in place. In the gleba, cottony threads called capillitia slow the rate of dispersal. Stalked puffballs (Tulostomatales and Podaxales) characteristically form underground, emerging on stalks after spore maturation; they are adapted to desert life by their protected hypogeous maturation. False puffballs (Sclerodermatales) typically have thicker peridial walls than true puffballs.
Industry:Science
An artificial class of fungi in the phylum Basidiomycota. It was traditionally divided into two subclasses: Holobasidiomycetidae, delimited by nonseptate basidia and the absence of a yeast phase; and Phragmobasidiomycetidae, frequently with septate basidia and often forming a yeast phase. A typical hymenomycete produces a fruit body or basidiome with spore-bearing basidia organized in a membranelike layer called the hymenium. The fruit bodies are designed to allow for basidiospore discharge into air currents either directly off basidia or after falling from elaborate fertile surfaces. Falling spores, indicative of active discharge, accumulate in powdery masses called spore prints. The shape of the hymenium varies from lamellate (gilled as in mushrooms), poroid (as in conk or bracket fungi), toothed (in hedge hog fungi), coralloid (coral fungi), labyrinthoid (daedaleoid fungi), wrinkled (merulioid fungi), or smooth to diffuse (corticioid fungi). Exceptional hymenomycetes may be aquatic, lack a mycelial phase, or lack a fruit body.
Industry:Science
An artificial device that circumnavigates the Earth, receiving and retransmitting radio-frequency signals to multiple points on Earth. The communications hardware includes antennas, receivers, signal processing, and power amplifiers. The performance is predicted by calculating the power received by the satellite and by the receiving ground station. The satellite has solar arrays and batteries to provide electrical power, thrusters to keep the satellite in the desired position and orientation, and radiators to dissipate heat. The equipment is designed to operate unattended for many years. Many communications satellites are put in a special circular orbit high above the equator.
Industry:Science
An artificial open channel usually used to convey water or vessels from one point to another. Canals are generally classified according to use as irrigation, power, flood-control, drainage, or navigation canals or channels. All but the last type are regarded as water conveyance canals.
Industry:Science
An artificial replacement of a body part. It may be an internal replacement such as an artificial joint or an external replacement such as an artificial limb. A prosthesis may be individually manufactured for each client, such as a limb prosthesis, or may be manufactured in large numbers but in different sizes, such as artificial hip joints. Prostheses of all types are lighter and more functional than their predecessors; the broad field of prosthetics has benefited from advances in materials, miniaturization, and computer-generated fabrication.
Industry:Science
An artificial surface laid over the ground to facilitate travel. In this article only road pavements are discussed. The engineering involved is closely similar to that for airport surfacing, another major type of pavement. A pavement's ability to support loads depends primarily upon the magnitude of the load, how often it is applied, the supporting power of the soil underneath, and the type and thickness of the pavement structure. Before the necessary thickness of a pavement can be calculated, the volume, type, and weight of the traffic (the traffic load) and the physical characteristics of the underlying soil must be determined.
Industry:Science
An assay that quantifies antigen or antibody by immunochemical means. The antigen can be a relatively simple substance such as a drug, or a complex one such as a protein or a virus.
Industry:Science
An assemblage of structural members joined at their ends to form a stable structural assembly. If all members lie in one plane, the truss is called a planar truss or a plane truss. If the members are located in three dimensions, the truss is called a space truss.
Industry:Science
