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Experi Mental Plant: About 1955, however, two other major types of plant hormones, the gibberellins and the cytokinins, were recognized. (The gibberellins had been known as long as auxin, but their significance had not been understood.) By 1965 two more substances had been added to the list of hormones: abscisin, or abscisic acid, and ethylene. The significance of these two advances—the cracking of the genetic code and the discovery of several new plant hormones—for developmental plant biology is closely interrelated.
Wilhelm's placing of his son in an experi mental plantmental school (the "Pedagogical Province") lets Goethe outline an educational program in which private worth and talent can be developed without detriment to the spirit of enterprise and communal needs. Aspects of Goethe s social vision have ceased to be immediately applicable.
Meanwhile, quantum mechanics was used to explain the properties of matter in bulk. At present (195S) some difficulties remain, despite great successes ; it is uncertain whether quantum mechanics without additions can explain all present experi mental plantmental facts, let alone future discoveries.
The Heisenberg-Dirac forms of quantum mechanics are powerful and compact. |
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