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  1. Über den begriff „umwelt” in der biologie.Karl Friederichs - 1943 - Acta Biotheoretica 7 (3-4):147-162.
    The word “Umwelt” is not translated as yet and can perhaps not be translated. In its orginal and well known sense, inaugurated byUexküll, it means of the relations of an organism to its surroundings only those going over the receptive organs and the effective organs, while vegetative relations to the medium,e.g. respiration are excluded. The “Umwelt”-conception of ecology has always been a wider one, but by feeling only, without definition. H.Weber has tried to develop a “general biological Umwelt-conception”, including a (...)
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