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121.
The organic ground substance (OGS) is an adsorbent of many of the harmful substances found in productive soil. Using the example of adsorption enthalpy of Phenol derivatives, it can be shown that the organic connection on the OGS in sewage farm land and nonsewage farm land is comparable. Based on the OGS content, the sewage farm land showed itself to be the worse adsorbent. The reasons lie in blockage at the adsorption points caused by other molecules, but also because not all of the OGS on the sewage farm land functions as an adsorbent. 相似文献
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For 25 years the conception has been well established that the overwhelming majority of chemical elements and their isotopes have been synthesized in stars during the course of stellar evolution, in particular during the advanced stages and in supernova explosions. Until now this general idea has not led to major difficulties or inconsistencies. On the contrary, the theoretical models have been very successful in explaining the observed abundances in meteorites, planets (including the earth), stars (including the sun) and galactic cosmic rays. Our present understanding of nucleosynthesis will be reviewed with special attention given to nucleosynthetic processes in primordial stars and supernovae. We will concentrate primarily on predictions which can be made for relative abundances rather than for absolute abundances, because the latter problem requires evolutionary models of the galaxy which are beyond the scope of this article. 相似文献
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Passerine migrants require light from the blue-green part of the spectrum for magnetic compass orientation; under yellow light, they are disoriented. European robins tested under a combination of yellow light and blue or green light showed a change in behavior, no longer preferring their seasonally appropriate migratory direction: in spring as well as in autumn, they preferred southerly headings under blue-and-yellow and northerly headings under green-and-yellow light. This clearly shows that yellow light is not neutral and suggests the involvement of at least two types of receptors in obtaining magnetic compass information, with the specific interaction of these receptors being rather complex. 相似文献
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