The acetylation of aromatic amines by enzymes extracted from pigeon liver has been studied intensively, and the over-all process has been resolved into two clearly distinct steps. The pigeon liver extract that can acetylate sulfanilamide by utilizing adenosine triphosphate, coenzyme ,2, and acetate was treated with acetone to yield first, a fraction that produced acetyl-CoA and second, a fracti...

Hart, Beth A. (Cornell University, Ithaca, N.Y.), and Stanley A. Zahler. Lytic enzyme produced by Myxococcus xanthus. J. Bacteriol. 92:1632-1637. 1966.-Strain FBa of Myxococcus xanthus releases into its culture medium an enzyme capable of lysing Micrococcus lysodeikticus cells and of releasing N-acetyl amino sugars from their cell walls. The lysin is stable at pH values near neutrality and at t...

Cork smoker wash solids (black wax) that is obtained in the process of making corkboard by treating ground cork with superheated steam useless waste, generating environmental problems. On other hand, black wax a rich source friedelin (1) and 3-hydroxyfriedel-3-en-2-one (3), pentacyclic triterpenoids belonging to friedelane family. In present work, simple, fast, efficient procedure for extractio...

Thiirene, Thioketene, 1,2,3-Thiadiazole, Thio-Wolff Rearrangement Photolysis of argon-matrix isolated 4,5-bis(carbomethoxy)-l,2,3-thiadiazole with A = 254 or 265 nm resulted in the almost quantitative formation of bis(carbomethoxy)thiirene (3g). Photolysis of 3g could only be carried out by long irradiation times at short wavelength A = 210nm and resulted mainly in extensive fragmentation inste...

In the title complex, [Co(C(10)H(11)N(2)O(2))(2)(C(5)H(5)N)(2)], the Co(II) atom lies on a centre of symmetry and adopts a distorted cis-CoO(2)N(4) octa-hedral geometry. The two acetone salicyloylhydrazone ligands are deprotonated and act as N,O-bidentate monoanionic ligands, forming the equatorial plane, while the axial positions are occupied by two N atoms of two pyridine mol-ecules. The comp...

This study described the development of a method based on Soxhlet extraction combining high performance liquid chromatography (Soxhlet-HPLC) for the accurate detection of BDE-209 in soils. The solvent effect of working standard solutions in HPLC was discussed. Results showed that 1:1 of methanol and acetone was the optimal condition which could totally dissolve the BDE-209 in environmental samp...

In this study, we describe a highly selective etherification procedure of unprotected morroniside catalyzed by molecular iodine in acetone. The etherification reaction furnished 7-O-alkyl ether derivatives in reasonable yields within few hours under neutral conditions. Studies of the obtained products on cytotoxicity activity in colon 26-L5 cell line were examined. Among the tested compounds, 7...

The zirconium and hafnium imido metalloporphyrin complexes (TTP)M = NArtPr (TTP = meso-5,10,15,20-tetra-p-tolylporphyrinato dianion; M = Zr (1), Hf; AriPr = 2,6-diisopropylphenyl) were used to mediate addition reactions of carbonyl species and metathesis of nitroso compounds. The imido complexes react in a stepwise manner in the presence of 2 equiv of pinacolone to form the enediolate products ...

A spectrophotometric method for the direct determination of microgram quantities of calcium in serum is presented. In this procedure, 0.02 ml. of serum is interacted with buffered glyoxal bis (2-hydroxyanil) solution (GBHA) at pH 12.6. The resultant red calcium-GBHA complex is diluted in methanol-acetone-water solution, and the absorbance determined at 520 m . The effects of pH, temperature, CB...