An alumino-silicate zeolite, Linde Type-A (LTA) has been prepared from aluminium powder and sodium metasilicate by hydrothermal process. The zeolite was characterized by FTIR and X-ray diffraction (XRD) analysis and by measuring the surface acidity using KOH as adsorbate. The surface acidity of LTA zeolite varied greatly with varying synthesized conditions such as crystallization temperature, c...

In this study, we investigated the surface thermodynamic properties of four MOF structures UiO-66 series, by employing seven molecular models, a thermal model, and three other methods using inverse gas chromatography (IGC) technique at infinite dilution. We first determined effect modulation an acid (e.g., formic acetic acid) on hand, studied functionalization organic linker amine group (NH2) t...

The effect of alcoholic extract of Nigella sativa was investigated in rats to evaluate the anti-ulcer activity by using two models, i.e. pyloric ligation and aspirininduced gastric ulcer. The parameters taken to assess anti-ulcer activity were volume of gastric secretion, free acidity, total acidity and ulcer index. The results indicate that the alcoholic extract significantly (P < 0.001) decre...

FVMany different dosage schedules of antisecretory drugs for the treatment of duodenal ulcer are recommended. The relationship between degree of acid suppression and therapeutic efficacy has not been precisely defined for these drugs. We have examined the association between suppression of intragastric acidity and duodenal ulcer healing rates for a number of therapeutic regimens. For the H2 rec...

Biochemical investigations done on the blood and urine of currently healthy, uncomplicated patients previously treated by either proctocolectomy and ileostomy or colectomy and ileorectal anastomosis for ulcerative colitis were compared with estimations on matched controls. The most striking finding was the reduced urine volume, and to a lesser extent its sodium content, in patients with ileosto...

Since the discovery by Bohr and coworkers in 1904 of the effect of acidity on the oxygen equilibrium of hemoglobin, there have been a large number of investigations directed towards clarification of the physicochemical relationships of acid groups with the hemes in hemoglobin and its derivatives. It is the purpose of this paper to analyze modern quantitative data, including those for ferrihemog...

Different reactivity parameters yield different results for the relative acidity of zeolitic Brønsted sites in thin films and in bulk materials. Whereas the adsorption energies of ammonia and pyridine are about the same, the energy of deprotonation is much lower for two-dimensional systems than for three-dimensional systems. It is shown that this is due to the smaller effective dielectric const...

Introduced here is a quick, simple, robust method to measure acidity in ionic liquid (IL) systems by the use of the NMR-probe mesityl oxide. Acidity corresponding to a Hammett acidity of -1 to -9 can be measured reliably using this technique, a range that vastly exceeds that of any single UV-vis probe.