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plasmodium
plasmodium name for a stage in the life cycle of a slime mold . Also, Plasmodium is the name given to the genus of the protozoan parasite that causes malaria .
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cycle
cycle in astronomy, period of time required for the recurrence of some celestial event. The length of a cycle may be measured relative to the sun or to the fixed stars (see sidereal time ). A frequently observed cycle is the day , during which the sun seems to circle around the earth due to the e...
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Krebs cycle
Krebs cycle series of chemical reactions carried out in the living cell; in most higher animals, including humans, it is essential for the oxidative metabolism of glucose and other simple sugars. The breakdown of glucose to carbon dioxide and water is a complex set of chemical interconversions ...
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Wolf, Rudolf
Wolf, Rudolf( Johann Rudolf Wolf) (1816–93)Swissastronomer. Following the discovery of the solar cycle by S. H.Schwabe, Wolf set about collecting all available data on sunspot numbers. He established the dates of all sunspot maxima and minima going back to the year 1610, and calculated the l...
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Felix Mottl
Felix Mottl , 1856-1911, Austrian conductor. He assisted Wagner in preparing the first Bayreuth Festival, at which he conducted the Ring cycle. Mottl conducted (1881-1903) at the court at Karlsruhe, where he produced the complete cycle of Berlioz's operas. In 1904 he became director of the Vienna ...
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citric acid cycle
citric acid cycle (Krebs' cycle, tricarboxylic acid cycle) The cyclic series of reactions which represent the principal means by which most living cells provide hydrogen and electrons for the generation of ATP via the electron-transport chain and oxidative phosphorylation. The hydrogen is taken up b...
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Passion cycle
Passion cycle in art, the depiction of the last events in the life of Jesus. The Passion was a favorite subject of medieval and Renaissance artists and was considered the most ambitious of projects. The scenes depicted generally include the entry of Jesus into Jerusalem, the washing of his feet, th...
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cocoon
cocoon Silken sheath which the pupae of many insects, e.g. moths and bees, spin around themselves for protection during this vulnerable stage in their life cycle. In the case of the silk moth, this covering can be unwound and spun into thread for the making of silk cloth....
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hertz
hertz [for Heinrich R. Hertz ], abbr. Hz, unit of frequency, equal to 1 cycle per second. The term is combined with metric prefixes to denote multiple units such as the kilohertz (1,000 Hz), megahertz (1,000,000 Hz), and gigahertz (1,000,000,000 Hz).
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Julian Day calendar
Julian Day calendar system of astronomical dating that allows the difference between two dates to be calculated more easily than conventional civil calendars with their uneven months. It was devised by Joseph Scaliger in 1582 and named in honor of his father, Julius Caesar Scaliger. The Julian per...
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