title: Characterization of TS-mutants of cyanophage N-1 by their inactivation by physical and chemical agents.
abstract: The effect of temperature, ultraviolet (UV) light and ethylenediaminetetraacetic acid (EDTA) on the stability of cyanophage N-1, infecting the cyanobacterium Nostoc muscorum was studied. Complete inactivation of the phage occurred at 60 degrees C in 6 mins. All the temperature-sensitive (ts) mutants exhibited faster inactivation at 50 degrees C than the wild type. UV light readily inactivated the particles of the wild giving a survival of 3.44% at a dose of 60 secs. All the ts-mutants were found to be more sensitive to UV light than the wild type. 10(-4) mol/l EDTA inactivated 40% of the wild type in 60 mins. 5 x 10(-4) mol/l EDTA inactivated the wild type nearly completely within 2 mins, while a similar inactivation of ts-mutants required only 90 secs.
authors.affiliation: Department of Botany, Punjabi University, India.
authors.forename: T A
authors.initials: TA
authors.lastname: Sarma
authors.forename: R
authors.initials: R
authors.lastname: Singh
mesh_terms: D001435:Bacteriophages / Q000187:drug effects / Q000235:genetics* / Q000528:radiation effects; D000458:Cyanobacteria / Q000821:virology*; D004492:Edetic Acid / Q000494:pharmacology; D006361:Heating; D009154:Mutation; D013604:T-Phages; D014466:Ultraviolet Rays
chemical_list: D004492:Edetic Acid