To examine whether the sterol acetylation /deacetylation cycle might have a function in the detoxification of cells from potentially toxic steroid or steroid-like compounds,we examined the growth of wild type(BY4742),deacetylase mutant(say1Δ),acetyltransferase ATF2 mutant(atf2Δ)and their double mutant(atf2Δsay1Δ)cells in the presence of various plant extracts.

Comment on deacetylation kinetics of chitin;

Deacetylation Kinetics of Chitin and Application of Chitosan on Antibacterial Activity and Dyeing;

Firstly,calcium carbonate is removed by marinating in hydrochloric acid;secondly,protein is removed by base and then chitin is obtained;then chitin reacts with concentrated base in 50 ℃ and through control the reaction time,chitosan are gained with different degrees of deacetylation(DD),respectively 85%,93%,99%.

In such reaction, the degree of deacetylation, the viscosity and infrared absorbance spectrum of deacetylation product are controlled by a variety of factors, such as the alkaline concentration , the temperature and time of reaction.

In t(8;21) AML, a stable association of AML1/ETO fusion protein with the nuclear histone deacetylase complex (HDAC) is crucial to repressing transcription of AMLl target genes and blocking differentiation of hematopoietic precursors.

The acetoacetylated degree can be more than 70 percent with using CCl 3COOH,[LJ1,H,DY0] CH 3 SO 3H as catalyst at 120 ℃ or 140 ℃.