CYTOLOGICAL EFFECTS OF SPACE FLIGHT ON ROOT-TIP CELLS IN RAPESEED (Brassica napus L.) CHROMOSOME ABERRATION IN ROOT TIP CELLS OF BROAD BEAN AND BARLEY INDUCED BY ELECTRON STREAM THE CYTOLOGICAL EFFECT OF EMS ON SPIKES AND ITS INFLUENCE ON ANTHER CULTURE OF WHEAT IN VITRO TREATMENTS Micronuclei and abnormal division of Allium sativum breeded in polluted water THE AFFECTION OF CHEMICAL INDUSTRIAL EFFLUENT ON THE NUCLEAR STRUCTURE OF TIP CELLS IN ALLIUM CEPA Effect of Sodium Bisulphite on Growth and Cell Division in Hordeum vulgare Seedlings ON RELATIONSHIP OF SODIUM CHLORIDE CONCENTRATION TO CELL DIVISION, GENETIC DAMAGE AND GROWTH OF HORDEUM VULGARE SEEDLINGS Studies of hemocytes DNA damage by two pesticides acetamiprid and chlorpyrifos in predaceous spiders of Pardosa astrigera Koch Studies on the Micronuclei Induced by Irradiation in Vicia faba Cytogenetic Damage of A. sativum Root Cells Induced by Sulfur Dioxide