ErratumRyu HJ, Kim DY, Park JY, Chang HY, Lee MH, Han K-H, Chon CY, Ahn SH. Clinical features and prognosis of hepatocellular carcinoma with respect to pre-S deletion and basal core promoter mutations of hepatitis B virus genotype C2.

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The primary processes in the OH* radical-induced oxidation mechanism of sulphoxides have been investigated by pulse radiolysis and, in particular, by an improved conductivity detection method with a time resolution of ca. 50 ns in aqueous solution. Electrophilic addition of the OH-radical to the sulphoxide group leads to a transient adduct, R,SO(OH). which decays unimolecularly with tl12 up to 100 ns into a sulphinic acid, RSO,H, and a radical R*.The various RS0,H have been identified by their pK, , and R* (including t-butyl and phenyl radicals) by direct optical measurement or chemical scavenging experiments. The probability of radical split-off from R,SO(OH)* for mixed sulphoxides depends on the stability of the radical leaving. Depending on the nature of the sulphoxide substituents two other OH* radical reactions compete with, and may even predominate over, the addition at the sulphoxide group. Thus hydrogen-atom abstraction readily occurs from longer chain and branched aliphatic groups and in the presence of aromatic substituents OH* radicals add to the n-system to form a hydroxycyclohexadienyl radical. The respective yields, kinetics and some physico-chemical properties of the primary species are presented and discussed.

Ag+ ions are reduced in aqueous solutions by a short pulse of high-energy radiation. At the low radiation dose applied, second-order reactions of the early intermediates are negligible. Three elementary processes occur during microseconds after the pulse, in each of which Ag+ is a reactant: eq-+ Ag+ -Ago (k = 4.8x 1O' O M-' s-l); Ago + Ag+ -Ag2+ (k = 8.5 x lo9 M-' s-l); Ag2+ -t Ag+ -Ag32+ ( k = 2.0 x lo9 M-' s-l). The reactions overlap temporally. Computer simulation is used to obtain the rate constants and the absorption spectra of the three species involved. Ag32+ has not yet been detected in water at ambient temperature; it was known to exist only in zeolite cages and frozen organic glasses.