In the Introduction to the Derivative video we introduce the notion of the derivative of a function and explain how the derivative captures the instantaneous rate of change of a function. In the ...

Stem cell-derived cardiac myocytes have been transplanted in experimental settings to replace lost myocardial tissue, and this has been shown to improve myocardial function in animal experiments. Stem ...

Evidence was obtained to support the hypothesis that ethylene is involved in xylem differentiation in primary pith explants of Lactuca sativa L. cv Romaine cultured in vitro. Xylem elements ...