Acinar and ductal cells of the exocrine pancreas form a close functional unit. Although most studies contain data either on acinar or ductal cells, an increasing number of evidence highlights the importance of the pancreatic acinar-ductal functional unit. One of the best examples for this functional unit is the regulation of luminal pH by both cell types. Protons co-released during exocytosis f...

Nylon filters are a popular medium to collect atmospheric fine particles in different aerosol monitoring networks, including those operated by the U.S. Environmental Protection Agency and the Interagency Monitoring of Protected Visual Environments (IMPROVE) program. Extraction of the filters by deionized water or by a basic aqueous solution (typically a mixture of sodium carbonate and sodium bi...

In this work, two different experiments were set up and at the end the data were collectively analyzed using linear and non-linear regression. CO2 bubbling was applied to decrease the pH in both experiments, but in the second one also alkalinity was decreased by acidification with HCl. This must have resulted in a range of different bicarbonate and carbonate ion concentrations (that are unfortu...

THE electrocardiographic response in man to acute changes in blood hydrogen ion concentration has not been well defined. Although the effects of an acute alteration in blood pH have been studied in dogs and isolated heart preparations, -4 examinations in man have usually been limited to clinical situations in which disturbances in serum electrolytes occurred along with deviations in hydrogen io...

A novel dioxidomolybdenum complex, [MoO(2)L], derived from the tridentate aroylhydrazone 2-amino-N'-(2-hydroxy-3-methylbenzylidene)benzohydrazide (H(2)L), has been prepared and characterized by elemental analysis, FT-IR, (1)H NMR, and single crystal structural X-ray diffraction. The complex has distorted square pyramidal structure in which the aroylhydrazone ligand behaves as a binegative donor...

Objectives: Preliminary calculations indicated that carbonate radical may participate in organic compound removal during AOP application, and that in some cases, this participation might be further enhanced by relatively minor adjustments to the water chemistry, during a pretreatment step. The objectives of this project were to investigate those effects, develop a model for prediction of the ef...

Regulation of pH is critical for physiological processes. Maintenance of acid-base homeostasis is tightly regulated by the renal and respiratory systems. However, fluctuations in extracellular pH are also sensed by other organ systems. Ion transporter activity to modify the amount of acid (H+ and CO2) and bicarbonate HCO3 is therefore actively maintained within the kidney and lung. This review ...

We evaluated the Olympus Demand as a cost-saving measure, as a back up to a Technicon SMAC I, and to be the primary instrument for enzyme analysis. In general, it wasfound to be precise, reliable, easy to operate, but with only average turn-around time capabilities. Technically there were several limitations: (1) significant bilirubin interference in the analysis of serum bicarbonate and creati...

Carbonic anhydrases (CAs, EC 4) are zinc containing metalloenzymes. The active site of these enzymes contains a Zn (II) ion Co-ordinated by three histidine residues and a water molecule/hydroxide ion. Four distinct gene families encode them and distributed throughout the phylogenetic tree. Presently 16 different CA isoforms of alpha family have been isolated and characterized in mammals. They c...

The synthesis of pure and well dispersed lutetium aluminum garnet (LuAG) powder is crucial and important for the preparation of LuAG transparent ceramics. In this paper, high purity and well dispersed LuAG powders have been synthesized via co-precipitation method with lutetium nitrate and aluminum nitrate as raw materials. Ammonium hydrogen carbonate (AHC) was used as the precipitant. The influ...