It is now recognized that crossfeeding does not occur with derivatives of the mouse L-cell line (such as A9) , nor with certain HeLa clones. However, crossfeeding does occur with other heteroploid mouse lines (3T3 and derivatives), hamster BHK-21 cells and derivatives, and diploid human fibroblasts.
Muslim astronomers from the 8th century onwards concerned themselves with the determination of the qibla as a problem of mathematical geography.
ON January 20, 1953, I stood on a platform at the East Front of the Capitol in Washington to take the oath, administered by Chief Justice Fred M. Vinson, as the thirty-fourth President of the United States — an office I was to hold for eight years.
But the college student is often neither a boy nor a man. . . . Reference is here made, of course, to that species of featherless biped which at times, especially when taken alone, seems to show many of the characteristics of rational intelligence, but which, when merged into a crowd of its fellows, is apt, on the least provocation, to part with its power of thought and lapse into all manner of irrational ways.
