Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Dependence of th on N. Plot shows calculated th for a range of N using Eq. 10 and physiological values of PS, Vi, and d (1.95 × 10−7 cm/sec, 100 fl, and 6.6 μm, respectively). Notice that th is only modestly affected by physiological variations in N, the population mean of which varied between 39 and 71 fl in 12 separate experiments.
