We developed surface grid-based solvation free energy density (Surface-SFED) models for 36 commonly used polar solvents. The parametrization was performed with a large and diverse set of experimental solvation free energies mainly consisting of combinations of polar solvent and multipolar solute. Therefore, the contribution of hydrogen bonds was dominant in the model. In order to increase the a...

In this study ethanolic extract of Aegle marmelos was evaluated for its anti-ulcer activity against aspirininduced gastric ulcer in albino rats. Various biochemical parameters such as gastric volume, pH of gastric content, free acidity and total acidity, total carbohydrate content such as total protein, hexoses, hexosamine, fucose and sialic acid were estimated in alcoholic precipitate of gastr...

Introduction We employ a combined computational-experimental approach to probe the Lewis acidity of silica-alumina, and extend this study to the effect of Lewis acidity on the activation and activity of a supported methyltrioxorhenium (MTO) metathesis catalyst. Despite the widespread use of amorphous silica-alumina as a catalyst and a catalyst support, the structures of its Lewis acid sites rem...

In studies on the hydrogen ion concentration gradient and total acidity in plants it was noticed that these varied greatly in Bryophyllure calycinum with the light conditions of the day; on a cloudy day the H ion concentration and total acidity were very high, while on a bright sunny day they were 10w. ~ From this it was inferred that there might be diurnal changes in these concentrations. Refe...

OBJECTIVES To assess the erosive potential of a number of readily available flavoured waters in the laboratory. METHODS The erosive potential was assessed by measuring the pH, neutralisable acidity and ability to erode enamel. These were compared to an orange juice positive control. RESULTS The pH of the flavoured waters ranged from 2.64-3.24 with their neutralisable acidity ranging from 4....

Cyclopropane fatty acid synthase (cfa) catalyses the transfer of a methyl group from S-adenosylmethionine (SAM) to unsaturated fatty acids. Northern blot experiments demonstrated that the Lactococcus lactis MG1363 cfa gene is mainly expressed as a bicistronic transcript together with metK, the gene encoding SAM synthetase, and is highly induced by acidity. The cfa promoter was characterized by ...

Boreal stream networks are embedded in a mosaic of wetlands and lakes interspersed in the forest landscape. This mosaic results in complex and dynamic water chemistry that varies depending on stream size, catchment characteristics, season and flow. Spatiotemporal variations in stream acidity are however frequently predictable based on spatial patterns in the terrestrial watershed, and acidity h...

The study aimed on evaluating the feasibility of NIRS to predict sweetness and acidity of intact mango fruit in form of soluble solids content (SSC) and titratable acidity (TA) through calibration modeling. Diffuse reflectance spectra in NIR wavelength range of 1000 – 2500 nm were acquired for a total of 58 mango samples. PCR and PLSR were used to develop SCC or TA prediction models respectivel...

Various metal-β zeolites have been synthesized under similar ion-exchange conditions. During the exchange process, the nature and acid strength of the used cations modified the composition and textural properties as well as the Brönsted and Lewis acidity of the final materials. Zeolites exchanged with divalent cations showed a clear decrease of their surface Brönsted acidity and an increase of ...

Fasting gastrin levels rise steeply to levels exceeding adult fasting values after birth and do not fall despite the rising gastric acidity in the first few weeks of life. When both gastrin and acid secretion rise together (such as in the Zollinger-Ellison syndrome) the negative feedback between gastrin and antral acidity is not working [2,13,14]. During this time there is no post-prandial gast...