Ratcliffe, Christina, 1914-1988. : Ladies of Lascaris : Christina Ratcliffe and the forgotten heroes of Malta's War / Paul McDonald ; with a foreword by John Rhys-Davies
Ratcliffe, Francis, 1904-1970. : Flying fox and drifting sand : the adventures of a biologist in Australia / by Francis Ratcliffe ; with an introduction by Julian Huxley
The proportion of survivors in a group, e.g., of patients, studied and followed over a period, or the proportion of persons in a specified group alive at the beginning of a time interval who survive to the end of the interval. It is often studied using life table methods
The ratio of the number of conceptions (CONCEPTION) including LIVE BIRTH; STILLBIRTH; and fetal losses, to the mean number of females of reproductive age in a population during a set time period
Volume of biological fluid completely cleared of drug metabolites as measured in unit time. Elimination occurs as a result of metabolic processes in the kidney, liver, saliva, sweat, intestine, heart, brain, or other site
The number of mutations that occur in a specific sequence, GENE, or GENOME over a specified period of time such as years, CELL DIVISIONS, or generations
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Rate of Change. : Valuing Interest Payment Guaranteeson Developing Country Debt / International Monetary Fund