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- W1968984911 abstract "Light scattering from fibrin structures, obtained by exposure of fibrinogen to thrombin, Batroxobin (Reptilase) or coagulant fraction extracted from Contortrix venom at 20 and and 37°C, show in every case that rod-like intermediates are formed in the beginning of the aggregation process. The fibrils differ in the extent of branching and in lateral aggregation. Contortrix enzyme causes the highest branching density but the lowest lateral aggregation. Thrombin and Batroxobin give almost identical results. A change of temperature from 20 to 37°C yields an increase in branching density and lateral aggregation for the fibrin structures induced by the two snake venoms. With thrombin, however, the branching density decreases with the elevated temperature while the lateral aggregation strongly increases. Mostly opaque clots are obtained, with the exception of the clots induced by thrombin at 37°C, where a fine or traslucent gel is obtained. A very low extent of branching and translucent gels are also found with thrombin at 20°C and pH 7.3 but at pH 9.5 no correlation between a preferential cleavange of fibrinopeptide B and the lateral aggregation could be detected. The opacity is discussed as being the result of inhomogeneity in both branching and lateral aggregation. A quantitative analysis of the angular dependence of the scattered light indicates that non-activated human fibrinogen exists at least in the two conformations of a long rod, L = 95 ± 5 nm, and a short rod of 47.5 ± 5 nm, with mass fractions of ∼ 70 and 30%, respectively. Only the long rod conformation of the monomer is built in the fibril. The model of a pure end-to-end aggregation is shown to be unlikely and the possibility of an overlapping of the monomeric rods over a region of ∼ 8 nm is discussed." @default.
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- W1968984911 date "1981-02-01" @default.
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- W1968984911 title "Fibrinogen — fibrin transformation: 2. Influence of temperature, pH and of various enzymes on the intermediate structures" @default.
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- W1968984911 doi "https://doi.org/10.1016/0141-8130(81)90019-2" @default.
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