| 单词 |
panspermia |
| 释义 |
panspermia
pan·sper·mi·a P0046250 (păn-spûr′mē-ə)n. The theory that microorganisms or biochemical compounds from outer space are responsible for originating life on Earth and possibly in other parts of the universe where suitable environmental conditions exist.
[Greek panspermiā, mixture of all seeds : pan-, pan- + sperma, seed; see sperm1.]panspermia (pænˈspɜːmɪə) , panspermism , panspermatism or panspermyn (Philosophy) a 19th-century evolutionary theory that precursors to life exist in space and will develop on finding suitable conditionsTranslations
Panspermia
panspermia[pan′spər·mē·ə] (biology) The theoretical ability of life to travel from body to body within the solar system. Panspermia a hypothesis that living beings were brought to the earth from space. The theory was advanced by the German scientist H. Richterin 1865 and supported by H. Helmholtzand S. Arrhenius. According to panspermia, living embryos were brought to the earth by meteorites or by means of light pressure. Maintenance of their life in interplanetary space was considered possible because at low temperatures primitive organisms in a state of anabiosis can remain alive. But since it was later proved that they would have been destroyed by ultraviolet and cosmic rays, the transfer of living embryos through space must be regarded as unlikely. The panspermia hypothesis is also methodologically untenable since it does not answer the question of the origin of life. panspermia
pan·sper·mi·a , panspermatism (pan-sper'mē-ă, -sper'mă-tizm), The hypothetical doctrine of the omnipresence of minute forms and spores of animal and vegetable life, thus accounting for apparent spontaneous generation. [pan- + G. sperma, seed] panspermia (păn-spûr′mē-ə)n. The theory that microorganisms or biochemical compounds from outer space are responsible for originating life on Earth and possibly in other parts of the universe where suitable environmental conditions exist. |
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