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Rh factor

(Encyclopedia)Rh factor, protein substance present in the red blood cells of most people, capable of inducing intense antigenic reactions. The Rh, or rhesus, factor was discovered in 1940 by K. Landsteiner and A. S...

rhesus factor

(Encyclopedia)rhesus factor: see Rh factor.

Rh

(Encyclopedia)Rh, symbol for the element rhodium. ...

factor

(Encyclopedia)factor, in arithmetic, any number that divides a given number evenly, i.e., without any remainder. The factors of 12 are 1, 2, 3, 4, 6, and 12. Similarly in algebra, any one of the algebraic expressio...

erythroblastosis fetalis

(Encyclopedia)erythroblastosis fetalis ərĭthˌrəblăstōˈsĭs [key], hemolytic disease of a newborn infant caused by blood group incompatibility between mother and child. Although the Rh factor is responsible f...

Landsteiner, Karl

(Encyclopedia)Landsteiner, Karl kärl läntˈshtīnər [key], 1868–1943, American medical research worker, b. Vienna, M.D. Univ. of Vienna, 1891. In 1922 he came to the United States to join the staff of the Rock...

blood transfusion

(Encyclopedia)blood transfusion, transfer of blood from one person to another, or from one animal to another of the same species. Transfusions are performed to replace a substantial loss of blood and as supportive ...

blood groups

(Encyclopedia)blood groups, differentiation of blood by type, classified according to immunological (antigenic) properties, which are determined by specific substances on the surface of red blood cells. Blood group...

Hargrove, Roy Anthony

(Encyclopedia)Hargrove, Roy Anthony, 1969–2018, American jazz trumpeter, bandleader, and composer, b. Waco, Tex. In 1986, while in high school, he attracted the attention of Wynton Marsalis, who asked him to sit ...

blue baby

(Encyclopedia)blue baby, infant born with a congenital heart defect that causes a bluish coloration of the skin as a result of cyanosis (deoxygenated blood). The color is most noticeable around the lips and at the ...