Some simple measures of toxicity use bioassays to measure death rates in order to quantify the effect of the toxin. Such measures are commonly known as LD50 and LC50. The LD50 is defined as the lethal dose at which 50% of the population if killed in a given period of time; an LC50 is the lethal concentration required to kill 50% of the population. The LC50 is a measure, e.g. in mg/l, of the concentration of the toxin whereas a dose is a more general term (need not be a concentration but may be a specific temperature, etc.). These bioassays involve subjecting several replicate groups of individuals to a range of concentrations (or doses) of a toxic compound and measuring the mortality after a defined time interval, e.g. 24 hours, 1 week, 1 month, etc. The data are then plotted and the LC50 is interpolated from the graph.