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European Journal of Forest Research -     

Versuchswesen und forstliche Forschung in den Vereinigten Staaten von Amerika

Ohne ZusammenfassungDie Bearbeitung stützt sich auf Angaben des Werkes A National Plan For American Forestry. S. Res. 175. Washington 1933. U. St. Gouvernment Printing Office.     

A physiological basis for a theory of synapse modification

The functional organization of the cerebral cortex is modified dramatically by sensory experience during early postnatal life. The basis for these modifications is a type of synaptic plasticity that may also contribute to some forms of adult learning. The question of how synapses modify according to experience has been approached by determining theoretically what is required of a modification mechanism to account for the available experimental data in the developing visual cortex. The resulting theory states precisely how certain variables might influence synaptic modifications. This insight has led to the development of a biologically plausible molecular model for synapse modification in the cerebral cortex.     

Convergent projection of three separate thalamic nuclei on to a single cortical area

Three distinct sensory-motor nuclei in the thalamus project to parietal cortex in the Virginia opossum; the ventral posterior nucleus receives inputs from somatic sensory structures and projects to layers IV and III, the ventral anterolateral nucleus receives inputs from motor structures and projects to layers IV and III and inner I, and the central intralaminar nucleus receives inputs from sensory, motor, and other structures and projects to layers VI through outer I. The physiologically defined amalgamation of somatic sensory and motor cortex is correlated, therefore, with the extent of cortex that receives convergent somatic sensory and motor input from the thalamus.     

Gewinnung und Verwendung geringwertigen Holzes

Ohne Zusammenfassung     

Die Benutzung des Waldes zu Zwecken der Frholnng in Umerika

Ohne Zusammenfassung     

Schleppboote zur holzbef?rderung im ?stlichen Canada

Ohne Zusammenfassung