DE protection, demineralization, de colorization, and acetylation. Protein accesses were used to obtain chitosan from shrimp shell waste. Using FTIR, SEM XRD. It was characterized. Also analyzed the physiochemical parameter such as moisture content, hydrogen meter, viscosity, degree of acetylation solubility The age bacterial culture influenced its susceptibility with cells being most prone in ...

tetrahydropyranylation of alcohols and phenols, acetylation of aldehydes and n-boc protection of amines are efficiently catalyzed by melamine trisulfonic acid (mtsa). all reactions were performed at room temperature in good to high yields.

dodecylbenzenesulfonic acid (dbsa) was used as an efficient, cheap and stable brønsted catalyst for acetylation of alcohols and phenols and formylation of alcohols under solvent-free conditions. various primary, secondary and tertiary alcohols were acetylated with acetic anhydride as an acetylating agent under solvent-free conditions in the presence of catalytic amount of dbsa at room temperatu...

Hydrogen sulphide (H2S), a newly identified gasotransmitter, can be endogenously produced by cystathionine gamma-lyase (CSE) in the cardiovascular system. This study investigated role of CSE/H2S system on lipid overload-induced lipotoxicity and cardiac senescence. Lipid overload rat cardiomyocyte cells (H9C2) promoted intracellular accumulation lipid, oxidative stress, mitochondrial dysfunction...

Wood is a porous three dimensional, hydroscopic, viscoelastic, anisotropic bio-polymer composite composed of an interconnecting matrix of cellulose, hemicelluloses and lignin with minor amounts of inorganic elements and organic extractives. Some, but not all, of the cell wall polymer hydroxyl groups are accessible to moisture and these accessible hydroxyls form hydrogen bonds with water. As the...

Wound healing disorders including diabetic ulcers, chronic venous leg ulcers and pressure are still remains uncured pose a stern challenge to health care system. Accumulation of dysfunctional macrophages over time have been identified as major underlying cause for wounds, however molecular events regulating these unclear. In present study, we found that histone H3K27 acetylation, an epigenetic ...

fibers of poplar wood (populus nigra l.) were prepared and oven dried. afterwards, they were acetylated with acetic anhydride without a catalyst. acetylation was carried out for different durations at 120ºc. different weight percentage gains (wpgs) were achieved based on the operating conditions. acetylated fibers were exposed to varying levels of relative humidity to determine equilibrium mois...

Tetrahydropyranylation of alcohols and phenols, acetylation of aldehydes and N-Boc protection of amines are efficiently catalyzed by melamine trisulfonic acid (MTSA). All reactions were performed at room temperature in good to high yields.

We analyzed the relationship between histone acetylation and transcriptional regulation at 40 Saccharomyces cerevisiae promoters that respond to specific activators and repressors. In accord with the general correlation between histone acetylation and transcriptional activity, Gcn4 and the general stress activators (Msn2 and Msn4) cause increased acetylation of histones H3 and H4. Surprisingly,...