| 释义 |
pessimum|ˈpɛsɪməm|
[neut. sing. of L. pessimus worst.]
The most unfavourable condition in the habitat of an animal or plant. Also attrib. and transf.
1931R. N. Chapman Animal Ecol. viii. 189 It is possible..to conceive of survival potential as representing the actual position on the temperature scale where a species would experience its optimum and pessimum conditions. 1937Nature 16 Oct. 663/2 The first part [of the Russian book under review] contains..a clear presentation of basic ecological principles, namely, factors of existence, ecological valency, optimum and pessimum, habitat concept, biological types (life-forms) and biocœnoses. 1947N. Balchin Lord, I was Afraid 180 Assume that the radius of effectiveness..is 100 feet for a two-ton bomb—which is in many ways the pessimum hypothesis. 1976Nature 19 Feb. 537/2 Above ∼10 Ci s (4 rad to 1 kg) there is a ‘pessimum’ number of particles. |