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Tay-Sachs disease

(Encyclopedia)Tay-Sachs disease tāˈ-săksˈ [key], rare hereditary disease caused by a genetic mutation that leaves the body unable to produce an enzyme necessary for fat metabolism in nerve cells, producing cent...

cancer, in medicine

(Encyclopedia)cancer, in medicine, common term for neoplasms, or tumors, that are malignant. Like benign tumors, malignant tumors do not respond to body mechanisms that limit cell growth. Unlike benign tumors, mali...

crossing over

(Encyclopedia)crossing over, process in genetics by which the two chromosomes of a homologous pair exchange equal segments with each other. Crossing over occurs in the first division of meiosis. At that stage each ...

bioethics

(Encyclopedia)bioethics, in philosophy, a branch of ethics concerned with issues surrounding health care and the biological sciences. These issues include the morality of abortion, euthanasia, in vitro fertilizatio...

Donen, Stanley

(Encyclopedia)Donen, Stanley, 1924–2019, American film director, choreographer, and producer, b. Columbia, S.C. He is best known for directing some of Metro-Goldwyn-Mayer's finest musicals. In 1940 Donen danced i...

emphysema

(Encyclopedia)emphysema ĕmfĭsēˈmə [key], pathological or physiological enlargement or overdistention of the air sacs of the lungs. A major cause of pulmonary insufficiency in chronic cigarette smokers, emphyse...

Jacob, François

(Encyclopedia)Jacob, François fräNswäˈ zhäkôbˈ [key], 1920–2013, French biologist and geneticist, educated at the Sorbonne. His medical studies were interrupted by World War II. He joined the Free French F...

Brenner, Sydney

(Encyclopedia)Brenner, Sydney, 1927–2019, British molecular biologist, Ph.D. Oxford, 1954. He was director of the MRC Laboratory of Molecular Biology in Cambridge, England (1979–86), and director of the MRC Mol...

Reynolds, Debbie

(Encyclopedia) Reynolds, Debbie, 1932-2016, American actress, singer, and dancer, b. El Paso, Tx., as Mary Frances Reynolds. Reynolds’ family relocated from El Paso...

breast cancer

(Encyclopedia)breast cancer, cancer that originates in the breast. Breast cancer is the second leading cause of cancer death in women (following lung cancer). Although the vast majority of the cases occur in women,...