Mutation Research, 282 (1992) 289-291 ©. 1992 Elsevier Science Publishers B.V. All rights reserved 0165-7992 /92/$05.00 Contents Volume 282 (1992) Research Letters Past plagues and modern biotechnology H.S. Rosenkranz (U.S.A.) Synaptonemal complex alterations in X-irradiated and in oestrogen-treated mice: a comparative study M.B. Masumbuko, M.M. Freund and R. De Meyer (Belgium) Faster rates of DNA unwinding under alkaline conditions in xrs-5 cells may reflect chromatin structure alterations J.L. Schwartz, E. Moan, R. Mustafi, L. Fink and L.S. Yasui (U.S.A.) Sister-chromatid exchange rates in XX and XY cells of ten chimeric Callithrix jacchus individuals P. Bigatti, L. Lamberti, G. Oberto and G. Ardito (Italy) Electric and/or magnetic field effects on DNA structure and function in cultured human cells M. Fiorani, O. Cantoni, P. Sestili, R. Conti, P. Nicolini, F. Vetrano and M. Dacha (Italy) Application of the standard mutagenesis assay results in underestimation of ethyl methanesulphonate-induced mutations to ouabain-resistance in Chinese hamster cells F. Mirzayans, J.M. Parry and R. Mirzayans (Canada, Great Britain) A recA-ada hybrid gene inducible by DNA damage K. Kleibl, G.P. Margison, M. Skorvaga, J. Brozmanova and F. MaSek (Czechoslovakia, U.K.) The effect of caffeine on DAPI-inducible fragile sites F. Pelliccia and A. Rocchi (Italy) Camptothecin-induced sister-chromatid exchange dependent on the presence of bromodeoxyuridine and the phase of the cell cycle J.H. Zhao, H. Tohda and A. Oikawa (Japan) Influence of cinnamaldehyde on UV-induced gene conversion and point mutation in yeast: effect on protein synthesis A. Galli, C. Della Croce, S. Minnucci, R. Fiorio and G. Bronzetti (Italy) Cytotoxicity of tin on human peripheral lymphocytes in vitro B.B. Ganguly (Ghosh), G. Talukdar and A. Sharma (India) Low temperature between conditioning and challenge treatment prevents the ‘adaptive response’ of Vicia faba root tip meristem cells R. Rieger, A. Michaelis and S. Takehisa (Germany, Japan) 69 Increased mutagenicity of some nitroimidazoles by non-mutagenic nitrotoluene on Klebsiella pneumoniae (fluctuation test) C.E. Voogd, J.J. van der Stel and M.C. van Bruchem (Netherlands) 73 Simultaneous analysis of chromosome damage and aneuploidy in cytokinesis-blocked V79 Chinese hamster lung cells using an antikinetochore antibody G. Krishna, R. Fiedler and J.C. Theiss (USA) 79 Solvent extraction efficiencies of mutagenic components from diesel particles C.N. Montreuil, J.C. Ball, R.A. Gorse Jr. and W.C. Young (U.S.A.) 89 Glycyrrhiza glabra extract as an effector of interception in Escherichia coli K12 + S. Kuo, D.M. Shankel, H. Telikepalli and L.A. Mitscher (USA) 93 Genotoxicity of N-acryloyl-N '-phenylpiperazine, a redox activator for acrylic resin polymerization M. Taningher, R. Pasquini, M.C. Tanzi and S. Bonatti (Italy) 99 Chromosome aberrations reduced in whole-body irradiated mice by pretreatment with cyanide J. Schubert, S.F. Pan and N. Wald (USA) 107 Insect sex chromosomes, XI. >H-TdR induces random aberrations in the X chromosome(s) of Gryllotalpa fossor (Orthoptera) S. Sarkar and S.R.V. Rao (India) 113 Inhibition of mutagenesis by p-aminobenzoic acid as a nitrite scavenger Y. Kako, Y. Toyoda, Y. Hatanaka, Y. Suwa, H. Nukaya and M. Nagao (Japan) 119 Ethylene dibromide: negative results with the mouse dominant lethal assay and the electrophoretic specific-locus test L.B. Barnett, D.P. Lovell, C.F. Felton, B.J. Gibson, R.R. Cobb, D.S. Sharpe, M.D. Shelby and S.E. Lewis (USA, UK) 290 Induction of sister-chromatid exchanges by 2-aminofluorene in cultured human lymphocytes with and without erythrocytes H. Norppa and H. Jarventaus (Finland) 135 32 P_Postlabelling analysis of DNA from human tissues M.N. Routledge, R.C. Garner, D. Jenkins and J. Cuzick (UK) 139 Suppressing effects of glucan on micronuclei induced by cyclophosphamide in mice D. Chorvatovicova and J. Navarova (Czechoslovakia) 147 Melphalan, a second chemical for which specific-locus mutation induction in the mouse is maximum in early spermatids L.B. Russell, P.R. Hunsicker and M.D. Shelby (USA) 151 Simultaneous evaluation of clastogenicity, aneugenicity and toxicity in the mouse micronucleus assay using immunofluorescence G. Krishna, R. Fiedler and J.C. Theiss (USA) 159 The clastogenic potential in vitro of pyrrolizidine alkaloids employing hepatocyte metabolism L. Miller, P. Kasper and G. Kaufmann (Germany) 169 Modified metabolism of a carcinogen, 3-amino-1-methyl-5 H-pyrido[4,3-b jindole (Trp-P-2), by liver S9 from Schisto- soma japonicum-infected mice S. Arimoto, H. Matsuoka, T. Aji, A. Ishii, Y. Wataya and H. Hayatsu (Japan) 177 Mutagenic specificity in DNA base sequence by irradiation of health lamp light (UV-B) in Escherichia coli K. Okaichi, K. Nagashima, K. Nozu and T. Ohnishi (Japan) 183 Sampling times in micronucleus testing P. Vanparys, G. Deknudt, F. Vermeiren, M. Sysmans and R. Marsboom (Belgium) 191 Characterization of the progeny of X-ray irradiated males from two Drosophila virilis strains differing in genetic instability I.S. Gubenko and R.P. Subbota (Ukraine) 197 Inhibition of recA induction by the radioprotector 2-mercaptoethylamine M. Naslund, A. Kolman and L. Ehrenberg (Sweden) 203 No increase in chromosome aberrations in workers from an oil catalytic cracking plant A. Rojas and S.I. Fernandez (Cuba) 209 Sister-chromatid exchanges in B-thalassaemic patients under conditions of in vivo and in vitro depletion of folic acid A.E. Silva, A.J. Manzato and M. Varella-Garcia (Brazil) 213 The presence of genotoxic and bioactive components in indigo dyed fabrics — a possible health risk? U. Rannug, H. Bramstedt and U. Nilsson (Sweden) 219 Technical Note A simple and convenient method for gaining pure populations of lymphocytes at the first mitotic division in vitro D.-q. Chen and C.-y. Zhang (China) 227 Research Letters Clastogenicity of 2-chlorobenzylidene malonitrile (CS) in V79 Chinese hamster cells M. Bauchinger and E. Schmid (Germany) 231 Mutagenicity of methyl methanesulfonate and cyclophosphamide in resting and growing Saccharomyces cerevisiae D7 cells M. Monaco, R. Dominici, P. Barisano, G. Di Palermo, A. Galli and G. Bronzetti (Italy) 235 Decreased electrophilicity of chemicals carcinogenic only at the maximum tolerated dose H.S. Rosenkranz and G. Klopman (USA) 241 UV resistance of E. coli K-12 deficient in cAMP/CRP regulation M.-F. Puyo, P. Calsou and B. Salles (France) 247 Inhibition of sulfotransferase affecting unscheduled DNA synthesis induced by 2-acetylaminofluorene: An in vivo and in vitro comparison D.K. Monteith (USA) 253 Chromosomal analysis of Chinese hamster V79 cells exposed to multiple y-ray fractions: induction of adaptive response to mitomycin C M. Osmak and D. Horvat (Croatia) 259 X-Rays, microwaves and vinyl chloride monomer: their clastogenic and aneugenic activity, using the micronucleus assay on human lymphocytes A. Fuéi¢é, V. Garaj-Vrhovac, M. Skara and B. Dimitrovié (Croatia) Purified prostaglandin synthase activates aromatic amines to derivatives that are mutagenic to Salmonella ty- phimurium F.H. Sarkar, G. Radcliff and D.M. Callewaert (USA) Are mitotic index and lymphocyte proliferation kinetics reproducible endpoints in genetic toxicology testing? E. Rojas, R. Montero, L.A. Herrera, M. Sordo, M.E. Gonsebatt, R. Rodriguez and P. Ostrosky-Wegman (Mexico) Corrigendum Contents, Vol. 282 (1992)