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Please replace the paragraph Culture of material in Materialand method on page 574 (Fujii, Shimmen and Tazawa), Vol. 19,No. 4 with the following corrected paragraph. Materials and methods Culture of material Spirogyra sp. used for the experiments was collected in theriver Kamogawa in Kyoto. Cylindrical cells composing the filamentwere 55 µm in diameter and 100–200 µm in length.Each cell usually had one spiral ribbon-like chloroplast. Thealga was cultured in slightly modified Reichardt's medium (27),1000 ml of which contained: 200 mg KNO₃, 20 mg K₂HPO₄, 10mgH₃BO₃, 6.6 mg FeSO₄?7H₂O, 25 mg Na₂EDTA (ethylenediamine tetraaceticacid disodium salt), 200 mg NaHCO₃, 50 mg CaSO₄?2H₂O, 10mg MgSO₄?7H₂O,0.5 mg ZnSO₄?7H₂O, 5mg MnCl₂?4H₂O, 24 µg Na₂MoO₄, 2 µgCoCl₂?6H₂O, 500 mg Tris. The pH was adjusted to 7.4 with HCl.The alga was cultured in a Petri dish at 20?1?C under a 16 hr–8hr light-dark regime. The light intensity was about 2000 lux.Under such conditions, the cells divided once a day fairly synchronously. Experimental solutions Artificial pond water (APW) containing 0.1 mM each of KCl, NaCland CaCl₂     

ERRATA

Line 5 of Abstract should read as "..., but those of other nucleotideswere similar. Little or no net increase in the level of nucleotideswas".     

ERRATA

Russian Journal of Bioorganic Chemistry -