Acta Biologica 46. (1995)

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ACTA BIOLOGICA HUNGARICA A QUARTERLY OF THE HUNGARIAN ACADEMY OF SCIENCES Acta Biologica publishes original papers on experimental biology. Acta Biologica is published in yearly volumes of four issues by AKADÉMIAI KIADÓ Publishing House of the Hungarian Academy of Sciences H-1117 Budapest, Prielle K. u. 19-35 Manuscripts and editorial correspondence should be addressed to Acta Biologica H-8237 Tihany, Hungary Subscription information Orders should be addressed to AKADÉMIAI KIADÓ H-1519 Hungary, P.O. Box 245 Subscription price for Volume 46 (1995) in 4 issues US$ 92.00, including normal postage, airmail delivery US$ 20.00. “This periodical is included in the document delivery program THE GENUINE ARTICLE of the Institute of Scientific Information, Philadelphia. The articles published in the periodical are available through The Genuine Article at the Institute for Scientific Information, 3501 Market Street, Philadelphia PA 19104.” Acta Biologica Hungarica is abstracted/indexed in Biological Abstracts, Chemical Abstracts, Current Contents-Agriculture, Biology and Environmental Sciences, database (EMBASE), Index Medicus, Inter­national Abstracts of Biological Sciences © Akadémiai Kiadó, Budapest 1995 PRINTED IN HUNGARY Akadémiai Kiadó és Nyomda, Budapest