Glucose-l-phosphoric acid was first isolated from minced and washed frog muscle which had been incubated for 3 hour in phosphate buffer containing small amounts of adenylic acid (2). Under these conditions part of the glucose-l-phosphoric acid (l-ester) was converted to hexose-6-phosphoric acid (8ester), so that fractional crystallization of the brucine salts had to be resorted to as a means of...

Multi-mode universal adhesives (UA) are indicated as either self-etch or etch-and-rinse adhesives, and manufacturers also recommend an alternative ‘selective enamel etch’ technique. Currently available laboratory data support phosphoric acid selective etching of enamel prior to use of UA to improve bond strength. In another way to improve adhesion to enamel of UA without the use of phosphoric a...

Anthocyanins were extracted from a mixture of berries of Vaccinium angustifolium and Vaccinium myrtilloïdes at 7.7 degrees C, 26 degrees C, and 79 degrees C using ethanol alone or ethanol acidified with hydrochloric, citric, tartaric, lactic, or phosphoric acids at a solvent to solid ratio of 10. The effect of these parameters on extracted anthocyanins stability was investigated. The pH-differe...

An improved liquid chromatographic (LC) method was developed for determination of organic acids in leaves, pulp, fruits, and rinds of Garcinia. At present, the commonly used LC method for analysis of organic acids in Garcinia extracts uses direct application of the extracts on the column. This practice gradually reduces efficiency of the column and shortens its life. In the improved method, the...

Culture and Collection illethods-A wild Oregon R stock of Drosophila melanogaster which is highly inbred was used throughout these experiments. Cultures were grown on a medium containing corn meal, agar, sucrose, glucose, brewers’ yeast, living yeast, propionic acid, and phosphoric acid. When the resulting progeny were to be uniformly labeled with s2P, the phosphoric acid was omitted from the m...

KRISZTINA MÁRTHA1, ALEXANDRU OGODESCU2*, CRISTINA BICA1, EMILIA OGODESCU2*, IRINA ZETU3 1 University of Medicine and Pharmacy of Târgu Mures, Faculty of Dental Medicine, Department of Orthodontics and Pediatric Dentistry, 38 Gheorghe Marinescu Str., 540141 Târgu Mureo, Romania 2 ”Victor Babeo” University of Medicine and Pharmacy, Faculty of Dental Medicine, 2nd Department, Discipline of Paedodo...

Solvent extraction using organic solvents is an important technology for the purification of wet process phosphoric acid (WPA). In this study, the purification process of WPA, using a new type of solvent extraction system, cyclohexanol diluted in kerosene, was investigated. The equilibrium phase diagram of the system H3PO4 H2Osolvent mixtures at 313.2K was obtained. The effects of extraction ...

The purpose of this study was to examine the feasibility of a conditioner for treating enamel and dentin simultaneously for MMA-TBB resin bonding. Various phosphoric acid solutions containing copper salts were prepared and used as conditioners before bonding MMA-TBB resin to bovine teeth. Their effects on the surface morphology and bonding were studied by scanning electron microscopy and tensil...

The flaky graphites were prepared from lignite. The effects of phosphoric acid ratios and pyrolysis temperatures on flake formation were studied by SEM, TEM and XRD. The results showed that the flaky graphite occurred at a pyrolysis temperature of 600°C with a 1.0:1.0 ratio of carbon to phosphoric acid. The flaky formation was almost completed by pyrolysis at 800°C and with a 1:2.0 ratio of car...

a most effective and less energy demanding method of producing fatty esters, diol esters, by esterifying fatty acids, with neopentyl and ethylenglycol alcohols in the presence of an acidic ion exchange resin catalyst(polyestyrendivinylbenzensulfated) was investigated at elevated temperature. in this process an azeotroping agent, toluene, was used to facilitate continuous removal of water by dis...