Loss of the Viability and Accumulation of the Chromosome Aberration in Ultradried Elm Seeds During Accelerated Aging CYTOLOGICAL CHANGES OF ROOT TIP CELLS OF ALFALFA SEEDS AFTER SPACE FLIGHT The Relations Between Chromosome Aberration and the Intercellular Chromatin Migration in Pollen Mother Cells of Vicia faba THE DEVELOPMENT OF THE NONVACUUM PULSE ELECTRONIC BEAM APPARATUS AND ITS MUTAGENIC EFFECTS ON PEA SEEDS Temperature Influences on the Allelopathy Effect of Aqueous Extracts from Trifolium repens L. CYTOLOGICAL EFFECT OF NITROGEN ION IMPLANTATION INTO Stevia CYTOLOGICAL EFFECTS INDUCED BY ~(60)Coγ-IRRADIATION ON MOSO SEED CYTOLOGICAL EFFECTS OF SPACE FLIGHT ON ROOT-TIP CELLS IN RAPESEED (Brassica napus L.)