1. Aflatoxins and N - nitroso compounds, which are carcinogenic are frequently found in chili powder.

2. N- nitroso compounds are not directly cause cancer but the chemical nature is easy to generate lively azo-alkyl compounds and ammonia compounds which have carcinogenic activity.

3. The nitroso intermediate ( 4 ) has been isolated from the reaction.

4. Objective To study the characteristics of the Nitroso - bacteria in one - step completely autotrophic nitrogen removal process.

5. The electrochemical behavior of Nitroso R salt on mercury electrode was investigated, and the mechanism of the reaction was discussed.

6. The nitroso blood red pigment colouring agent for food can be made from fresh livestock blood of healthy pigs, oxen and sheep by means of chemical thesis, enzymolysis, etc.

7. Nitroso -hemoglobin was treated with polysaccharide to prepare glycosylated nitroso -hemoglobin, stabilities of new pigment were enhanced obviously under light and heat.

8. It can greatly promote carcinogenesis. DNA diluted alkali firer proves N- nitroso compounds induce the crosslinking between complementary DNA base pairs and initiate cell cancerization.

9. An automatic analyzer for determination of cobalt in solution is described. Its chemical analysis is based upon nitroso R salt photometry method which is also a national standard one.