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enthalpy

(Encyclopedia) enthalpyenthalpyĕnˈthălpē [key], measure of the heat content of a chemical or physical system; it is a quantity derived from the heat and work relations studied in thermodynamics. As a…

geochemistry

(Encyclopedia) geochemistry, study of the chemical changes on the earth. More specifically, it is the study of the absolute and relative abundances of chemical elements in the minerals, soils, ores,…

histone

(Encyclopedia) histonehistonehĭsˈtōn [key], any of a class of protein molecules found in the chromosomes of eukaryotic cells. They complex with the DNA (see nucleic acid) and pack the DNA into tight…

millet

(Encyclopedia) millet, common name for several species of grasses cultivated mainly for cereals in the Eastern Hemisphere and for forage and hay in North America. The principal varieties are the…

Aegean civilization

(Encyclopedia) Aegean civilizationAegean civilizationējēˈən [key], term for the Bronze Age cultures of pre-Hellenic Greece. The complexity of those early civilizations was not suspected before the…

button

(Encyclopedia) button, knoblike appendage used on wearing apparel either for ornament or for fastening. Although buttons were sometimes used as fasteners by Greeks and Romans, they were more often…

straw

(Encyclopedia) straw, dried stalks of threshed grains, especially wheat, barley, oats, and rye. It has been used from antiquity for bedding, covering floors, and thatching roofs, as fodder and litter…

artificial insemination

(Encyclopedia) artificial insemination, technique involving the artificial injection of sperm-containing semen from a male into a female to cause pregnancy. Artificial insemination is often used in…

arson

(Encyclopedia) arson, at common law, the malicious and willful burning of the house of another. Originally, it was an offense against the security of habitation rather than against property rights.…