## dilution rate, $$D$$

in biotechnology
https://doi.org/10.1351/goldbook.D01740
The ratio of the ingoing @V06642@ ($$\frac{\text{d}V}{\text{d}t}$$) and the culture volume ($$V$$). In continuous @F02337@, a measure of a rate at which the existing medium is replaced with fresh medium, $$D$$ is the reciprocal of the hydraulic retention time ($$\mathrm{HRT}$$).
Source:
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 152 [Terms] [Paper]