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dominant
dominant 1. (in genetics) Describing the allele that is expressed in the phenotype when two different alleles of a gene are present in the cells of an organism. For example, the height of garden peas is controlled by two alleles, ‘tall’ (T) and ‘dwarf’ (t). When both are... Read more |
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Therapeutic touch
Therapeutic touch Definition Therapeutic touch, or TT, is a noninvasive method of healing derived from an ancient laying-on of hands technique. In TT, the practitioner alters the patient's energy field through a transfer of energy from the hands of the practitioner to the... Read more |
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Saint Walburga
Saint Walburga , d. c.779, English missionary in Germany; sister of St. Willibald. She went there to assist St. Boniface, settling at Heidenheim, near Eichstätt (NW of Ingolstadt), where another brother, Winnebald (or Wynbald), had an abbey. St. Walburga's convent became a principal center of... Read more |
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barycentric coordinates
Barycentric Coordinate Time (TCB) The time‐scale used in the Barycentric Celestial Reference System, the unit of which is the SI second. TCB differs from Terrestrial Time (TT) because of the movement of the Earth in the Barycentric Celestial Reference System and the Earth's immersion in the... Read more |
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Heavy Metals
Heavy Metals The heavy metals, which include copper (Cu), zinc (Zn), lead (Pb), mercury (Hg), nickel (Ni), cobalt (Co), and chromium (Cr), are common trace constituents in the earth crust. Their concentrations in the ambient environment have increased dramatically since the Industrial Revolution,... Read more |
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ephemeris time
ephemeris time (ET), astronomical time defined by the orbital motions of the earth, moon, and planets. The earth does not rotate with uniform speed, so the solar day is an imprecise unit of time. Ephemeris time is calculated from the positions of the sun and moon relative to the earth, assuming... Read more |
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Oporto
Oporto , Port. Pôrto, city (1991 pop. 310,600), capital of Porto dist. and Douro Litoral, NW Portugal, near the mouth of the Douro River. It is Portugal's second largest city, after Lisbon, and an important Atlantic port. Its outer harbor is at Leixões . Oporto's most famous export... Read more |
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Battle of Oporto
Oporto, battle of, 1809. On 12 May 1809 British forces in the Peninsula under Wellesley faced Soult's French army of 11,000 across the Douro opposite Oporto. Believing a frontal assault to be impossible, Soult was taken by surprise when the British used four wine barges to ferry troops across the... Read more |
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Rem Koolhaas
Rem Koolhaas 1944-, Dutch architect, b. Rotterdam. He began his career as a journalist and screenwriter, moving to London in the late 1960s to study architecture. Koolhaas is widely viewed as the most intellectually challenging, audacious, and influential architectural thinker of his generation;... Read more |
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Ciudad Guayana
Ciudad Guayana , formerly Santo Tomé de Guayana, city (1990 pop. 453,047), Bolívar state, Venezuela, at the confluence of the Caroní and Orinoco rivers in the Guiana Highlands. Founded in 1961 and administered by the state economic planning commission, Ciudad Guayana united... Read more |
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