Now showing items 11-20 of 52
A note on system modelling, aggregation and reductionism
(Elsevier, 1971-10)
Zeigler and Weinberg (1970) presented a system theoretic discussion of biological modelling. In this paper some implications of this formulation for the wider problem of reductionism are examined. It is argued that the ...
Dynamic properties of fatty acid monomolecular films
(Elsevier, 1971-05)
Saturated fatty acids ranging from fifteen to twenty carbons in alkyl chain length were spread as insoluble monomolecular films and compressed continually at constant velocities. As these surface films assume close-packing ...
Tubocurarine binding in undercut cerebral cortex and the effect of long-term electrical stimulation
(Elsevier, 1971-06-18)
1. (1) An in vitro technique was used to study the binding capacity of the acetylcholinesterase (AChE)-rich synaptic membrane fraction of cat cerebral cortex for dimethyl-[14C]--tubocurarine. Observations were made on the ...
Metabolism of pregnenolone-4-14C and pregnenolone-7[alpha]-3H sulfate by the Macaca mulatta fetal adrenal in vitro
(Elsevier, 1971-02)
These studies were initiated to ascertain the feasibility of utilizing the fetal monkey adrenal as a model for further studies on comparative steroid metabolism at various periods of gestation. Homogenates of midtrimester ...
Cerebral lysosomes. VI. The in vivo uptake of Triton-WR-1339 by the lysosomes of the immature cerebral cortex and cerebellum
(Elsevier, 1971-03-05)
The detergent Triton-WR-1339 was injected intrathecally into immature rats and its uptake by the lysosomes of the cerebral cortex and the cerebellum was demonstrated. Uptake was assessed in vitro by examining the shift of ...
Assay of glycogen phosphorylase by differential spectropolarimetry
(Elsevier, 1971-09)
A differential spectropolarimetric method has been developed for the measurement of glycogen phosphorylase activity. The reaction course measured in this way was first order, in agreement with results obtained by measuring ...
Stimulation of glucose utilization and glycosaminoglycans production by fibroblasts derived from retrobulbar tissue
(Elsevier, 1971-11)
Cultures of fibroblasts derived from human retrobulbar tissue responded to the presence of living lymphocytes with increased release of glycosaminoglycans to the media and accelerated glucose utilization. At times the ...
Social and psychological problems of surveys on health and illness
(Elsevier, 1971-12)
Survey methods offer the possibility of obtaining extensive health information on populations, including the identification of people's health status and the nature of their illnesses. The inadequacy of respondent reports ...