- 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.
That branch of quantitative chemical analysis in which a desired constituent is converted (usually by precipitation) to a pure compound or element of definite, known composition, and is weighed. In a few cases, a compound or element is formed which does not contain the constituent but bears a definite mathematical relationship to it. In either case, the amount of desired constituent can be determined from the weight and composition of the precipitate. The following are the essential steps in a conventional gravimetric analysis.
Industry:Science
Space nuclear technology has been used for power generation, propulsion, and heating. It was first used in 1961 with the launch of the U.S. Navy's <i>Transit 4A</i> navigation satellite powered by a radioisotope thermoelectric generator (RTG), and both the United States and Russia have since launched spacecraft with radioisotope thermoelectric generators and nuclear reactors to generate power. No nuclear rockets have been launched, but there was extensive design and testing of such rockets in the United States in the 1950s and 1960s.
Industry:Science
The coupling of metabolic and light energy to the performance of transmembrane work through the intermediary of electroosmotic gradients. Processes include synthesis of adenosine triphosphate (ATP) by oxidative phosphorylation or by photosynthesis, production of heat, accumulation of small molecules by active transport, movement of bacterial flagella, uptake of deoxyribonucleic acid (DNA) during bacterial conjugation, genetic transformation and bacteriophage infection, and insertion or secretion of proteins into or through membranes.
Industry:Science
The developmental processes by which the definite cells and tissues which make up the body of an organism arise from embryonic cells. Among animals, the ectoderm, endoderm, and mesoderm, also known as the primary germ layers, provide the stem cells which gradually transform into distinctive kinds of cells and tissues. In the higher plants, meristematic cells, which occur wherever extensive growth takes place, provide the basis for tissue formation. Parenchyma, a simple permanent tissue, may dedifferentiate and become meristematic.
Industry:Science
The force per unit area that the air exerts on any surface in contact with it, arising from the collisions of the air molecules with the surface. It is equal and opposite to the pressure of the surface against the air, which for atmospheric air in normal motion approximately balances the weight of the atmosphere above, about 15 lb/in.<sup>2</sup> at sea level. It is the same in all directions and is the force that balances the weight of the column of mercury in the torricellian barometer, commonly used for its precise measurement.
Industry:Science
Squamata (snakes and “lizards”) is a successful reptile group and one that is important for studying biology. As ectothermic animals (animals whose body temperature is partly dictated by external conditions) that are sensitive to ecological change, squamates aid in the understanding of global climate shifts. As a morphologically and ecologically diverse component of the worldwide fauna today and in the fossil record, squamates represent a key element in studies of the evolutionary process, evolutionary reconstruction, and Earth history.
Industry:Science
The drug and also the plant known as the deadly nightshade, <i>Atropa belladonna</i>, which belongs to the nightshade family (Solanaceae). This is a coarse, perennial herb native to the Mediterranean regions of Europe and Asia Minor, but now grown extensively in the United States, Europe, and India. During the blooming period, the leaves, flowering tops, and roots are collected and dried for use. The plant contains several important medicinal alkaloids, the chief one being atropine, which is much used to dilate the pupils of the eye.
Industry:Science
The growth of affordable digital imaging technologies has created a huge demand for digital color reproduction and hence for color management. There is now widespread use of digital cameras, liquid-crystal displays (LCDs), inkjet printers, and photo editing and page layout software. Color imaging devices from different manufacturers use different device components, so the same image may look different on different devices. To achieve accurate and predictable color, it is necessary to have a framework that compensates for device differences.
Industry:Science
The ability of a microorganism to cause disease. Virulence and pathogenicity are often used interchangeably, but virulence may also be used to indicate the degree of pathogenicity. Infectious diseases are caused by bacteria, fungi, protozoa, viruses, and larger parasites. Scientific understanding of the underlying mechanisms of virulence has increased rapidly due to the application of the techniques of biochemistry, genetics, molecular biology, and immunology. Bacterial virulence is better understood than that of other infectious agents.
Industry:Science
The branch of engineering that deals with the production and use of nuclear energy and nuclear radiation. The multidisciplinary field of nuclear engineering is studied in many universities. In some it is offered in a special nuclear engineering department; in others it is offered in other departments, such as mechanical or chemical engineering. Primarily, nuclear engineering involves the conception, development, design, construction, operation, and decommissioning of facilities in which nuclear energy or nuclear radiation is generated or used.
Industry:Science
