in multi-step organic syntheses, the protection and deprotection of tetrahydropyranyl (thp) ethers is one of the most frequently used methods. over the years, different methods have been used from various catalytic systems for the protection of hydroxyl groups as thp ethers and their deprotection. herein we have reported that various alcohols and phenols have been efficiently converted to the c...

1n"a relativistic heavy-ion reaction, there are many processes which contribute to fragmentation phenomenon. Here we examine two: the direct fragmentation process in which the detected proton is emitted from a parent nucleus without additional scattering, and the hard scattering process in which a nucleon from one nucleus makes a collision with a nucleon from the other nucleus. In terms of a co...

Solid pyrimidine nucleic acid bases (cytosine, thymine, and uracil) were gamma-irradiated (50 KGy) and dissolved in deaerated solutions of adriamycin in water and dimethylsulfoxide (DMSO). Analogous experiments using unirradiated pyrimidines as controls were also performed. In water only gamma-irradiated cytosine showed a reaction with the adriamycin yielding a single ESR peak (g = 2.0033) cons...

Formal, Samuel B., (Walter Reed Army Institute of Research, Washington, D.C.), E. H. LaBrec, T. H. Kent, and S. Falkow. Abortive intestinal infection with an Escherichia coli-Shigella flexneri hybrid strain. J. Bacteriol. 89:1374-1382. 1965.-The mechanism of the apparent loss of virulence of an Escherichia coli-Shigella flexneri hybrid strain was studied. The parent Shigella strain caused a fat...

BACKGROUND Although many children experience violence and abuse each year, there is a lack of instruments measuring parents' emotional reactions to these events. One instrument, the Parent Emotional Reaction Questionnaire (PERQ), allows researchers and clinicians to survey a broad spectrum of parents' feelings directly related to their children's traumatic experiences. The objectives of this st...

BACKGROUND Insufficient knowledge of food allergy and anaphylaxis has been identified by caregivers as an important barrier to coping, and a potential cause of fear and anxiety, particularly for those with children newly diagnosed with food allergy. The purpose of the study was to better understand the experiences of caregivers of children with a first allergic reaction to food, and to identify...

A novel reaction system was developed for the production of metabolites of poorly water-soluble parent compounds using mammalian liver microsomes. The system includes the selection and use of an appropriate hydrophobic polymeric resin as a reservoir for the hydrophobic parent compounds and its metabolites. The utility of the extractive biotransformation approach was shown for the production of ...

Tandem mass spectrometry provides information on the dissociation pathways of gas-phase ions by providing a link between product ions and parent ions. However, there exists a distinct possibility that a parent ion does not dissociate directly to the observed product ion, but that the reaction proceeds through unobserved reaction intermediates. This work describes the discovery and kinetic analy...

A series of metal cation modified layered-double hydroxides (LDHs) and mixed oxides were prepared and used to be the selective oxidation of toluene with O2. The results revealed that the modified LDHs exhibited much higher catalytic performance than their parent LDH and the modified mixed oxides. Moreover, the metal cations were also found to play important roles in the catalytic performance an...