1. Alternatively using mutagenic methods by mutagen Nitrosoguanidine(NG)and Ultra violet(UV), S. 301 strain of salmonella bovismorbificans was sift out.

2. Methods:Chronic atrophic gastritis and precancerous lesions in rats were induced with N methyl N nitro N nitrosoguanidine(MNNG).

3. In order to get highly pathogenic biocontrol Strain for Cephalwwplos segetum, Original strain LD2-13 was mutagenized with nitrosoguanidine (NTG).

4. Aspergillus niger SL - 08 was treated by ultraviolet ( UV ) and nitrosoguanidine ( NTG ).

5. AIM: To find out common transcription factor binding sites in the promoter regions of the encoding genes of the co-expressive proteins induced by N-methyl-N'-nitro-N- nitrosoguanidine (MNNG).