KINETICS OF FORMATION OF METALLIC SILVER AND BINDING OF SILVER IONS BY TISSUE-COMPONENTS

被引:16
作者
GALLYAS, F
机构
[1] Department of Neurosurgery, University of Pécs Medical School, Pécs
关键词
D O I
10.1007/BF00493357
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
The effect of time on the formation of metallic silver by tissue reducing groups follows a curve which can be devided into three main parts. In the first, which may last for several hours, the reaction is very slow, and only an undetectably small amount of metallic silver is produced. In the second period the speed of the reaction first increases in a progressive manner and then begins to decrease gradually; during the third period the speed approaches zero asymptotically. Binding of the silver ions by the tissue commences initially at its fastest rate; the level then decreases steadily to zero within about a quarter of an hour. There is no direct relationship between the amount of silver ion bound to the tissue and the formation of metallic silver. The latter cannot take place by way of direct (non-catalysed) reaction. The following mechanism is proposed for the process: Transfer of electrons from the reducing molecules to the silver ions is mediated at first by certain tissue sites (catalytic points) and then also by the steadily increasing total surface area of the metallic silver grains (autocatalysis). On the basis of this mechanism, several anomalies of both the argentaffin and argyrophil reactions are explained. © 1979 Springer-Verlag.
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页码:87 / 96
页数:10
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