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- W1978097373 abstract "Fractions of symmetrical X,X-ionenes (X = 3, 6 and 10) with degrees of polymerization DP = 30−250 and nonsymmetrical 2,Y-ionenes (Y = 4, 6, 8, and 10), DP = 4−30, were used as positively charged partners of calf thymus DNA in polyelectrolyte complexes (PEC). The determined values of salt concentration, C*salt, corresponding to the complete dissociation of PEC increased with the lengthening of ionenes of both families. C*NaCl for PEC formed by relatively short 2,Y-ionenes of the same DP increased markedly with Y decrease. However the impact of this factor was substantially diminished upon lengthening of the 2,Y-ionenes. For the long-chained X,X-ionenes a more than 3-fold increase in X resulted only in moderate decrease in C*NaCl. These finding suggest that the effective charge density of different ionenes releasing from PEC at relatively high C*salt becomes comparable owing to their pronounced compaction. This assumption was supported by the results of treatment of the experimental data using the developed model of PEC dissociation in water−salt media, which established the conformations of the releasing chains as slightly more swollen than θ-coil for 3,3-ionenes, θ-coil for 6,6-ionenes, and close to globule for 10,10-ionenes. The findings appear to be of particular interest to gain a better insight into the mechanism of DNA interaction with positively charged counterpart in vivo and in vitro." @default.
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- W1978097373 date "2003-02-27" @default.
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- W1978097373 title "Conformational Changes of Aliphatic Ionenes in Water-Salt Solutions as a Factor Controlling Stability of Their Complexes with Calf Thymus DNA" @default.
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- W1978097373 doi "https://doi.org/10.1021/ma021361x" @default.
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