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Ratcliffe, Sir Peter John

(Encyclopedia)Ratcliffe, Sir Peter John, 1954–, British cellular and molecular biologist, M.D., Cambridge, 1987. He has been a researcher at Oxford since 1987. Ratcliffe, along with William Kaelin and Gregg Semen...

antisense

(Encyclopedia)antisense, DNA or RNA manipulated in a laboratory so that its components (nucleotides) form a complementary copy of normal, or “sense,” messenger RNA (mRNA; see nucleic acid). Antisense techniques...

Steinman, Ralph Marvin

(Encyclopedia)Steinman, Ralph Marvin, 1943–2011, Canadian biologist, M.D. Harvard Medical School, 1968. He was a researcher and professor at Rockefeller Univ., New York City, from 1970 until his death in 2011. St...

lymphatic system

(Encyclopedia)CE5 Lymphatic system lymphatic system lĭmfătˈĭk [key], network of vessels carrying lymph, or tissue-cleansing fluid, from the tissues into the veins of the circulatory system. The lymphatic sy...

radiation sickness

(Encyclopedia)radiation sickness, harmful effect produced on body tissues by exposure to radioactive substances. The biological action of radiation is not fully understood, but it is believed that a disturbance in ...

saccharin

(Encyclopedia)saccharin săkˈərĭn [key], C7H5NSO3, white, crystalline, aromatic compound. It was discovered accidentally by I. Remsen and C. Fahlberg in 1879. Pure saccharin tastes several hundred times as sweet...

Halsted, William Stewart

(Encyclopedia)Halsted, William Stewart hôlˈstĭd [key], 1852–1922, American surgeon, b. New York City, M.D. College of Physicians and Surgeons, 1877. He practiced in New York and in 1886 became the first profes...

Semenza, Gregg Leonard

(Encyclopedia)Semenza, Gregg Leonard, 1956–, American oncologist and molecular biologist, b. New York City, Ph.D. Univ. of Pennsylvania, 1984. Semenza has spent his entire career at the Johns Hopkins School of Me...

horse latitudes

(Encyclopedia)horse latitudes, two belts of latitude where winds are light and the weather is hot and dry. They are located mostly over the oceans, at about 30° lat. in each hemisphere, and have a north-south rang...

Murad, Ferid

(Encyclopedia)Murad, Ferid, 1936–, American pharmacologist, b. Whiting, Ind., M.D., Ph.D. Western Reserve Univ. (now Case Western Reserve Univ.), 1965. Murad taught at the Univ. of Virginia (1975–81), Stanford ...