نتایج جستجو برای: water ph

تعداد نتایج: 692976  

Journal: :Proceedings of the National Academy of Sciences 2018

1991
HONG LIN DAVID RANDALL

Ion transport inhibitors, amHoride, SITS, vanadate and acetazolamide, were added to the water to determine the effect of ion transfer mechanisms on the acidification of water passing over the gills. In neutral water, proton excretion causes a marked reduction in gill water pH. If water pH is 2.5 units lower than blood pH, however, then this proton excretion is inhibited and all water pH changes...

Journal: :Comparative biochemistry and physiology. Toxicology & pharmacology : CBP 2010
T G Correia A M Narcizo A Bianchini R G Moreira

The effects of aluminum on plasma ion, lipid, protein and steroid hormone concentration were evaluated in Oreochromis niloticus broodstock females. Lipid and protein concentrations from the gonads and liver were also measured. Experiments were performed at neutral and acidic water pH. Four groups of fish were tested for 96h: 1) control conditions at neutral water pH; 2) control conditions at ac...

Journal: :Shika Kiso Igakkai zasshi = Japanese journal of oral biology 1989
E Hoshino M Sato T Sasano K Kota

A transistor pH electrode (pH-ISFET electrode) was placed in each of four human mouths and bacteria were allowed to accumulate on it for 1, 2 or 3 days. Changes of plaque pH were measured in situ after application of sucrose solution (0.1, 1 or 3%) and, then, quick pH recovery by mouth-rinses with water was estimated. Although the acidic pH after application of 0.1% sucrose was easily and quick...

2012
Y. Gao

Summer cyanobacterial blooms caused an elevation in pH (9 to ∼10.5) that lasted for weeks in the shallow and tidal-fresh region of the Sassafras River, a tributary of Chesapeake Bay (USA). Elevated pH promoted desorption of sedimentary inorganic phosphorus and facilitated conversion of ammonium (NH+4 ) to ammonia (NH3). In this study, we investigated pH effects on exchangeable NH+4 desorption, ...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2012
Waka Kamichatani Yoshinori Inoue Atsushi Yamamoto

The effect of the mobile phase pH on the control of the electrostatic interaction was evaluated on a column packed with water-holding adsorbent on which diallylamine-maleic acid copolymers were immobilizing. The adsorbent showed extraordinary retention behaviors of water-soluble solutes under acidic conditions, however, their behavior became stable along with increasing pH. Hydrating water cont...

Journal: :The Annals of otology, rhinology, and laryngology 2012
Jamie A Koufman Nikki Johnston

OBJECTIVES At the cellular level, tissue-bound pepsin is fundamental to the pathophysiologic mechanism of reflux disease, and although the thresholds for laryngeal damage in laryngopharyngeal reflux and for esophageal damage in gastroesophageal reflux disease differ, both forms of damage are due to pepsin, which requires acid for its activation. In addition, human pepsin remains stable at pH 7....

2015
François Chauvigné Cinta Zapater Jon Anders Stavang Geir Lasse Taranger Joan Cerdà Roderick Nigel Finn

Water homeostasis and the structural integrity of the vertebrate lens is partially mediated by AQP0 channels. Emerging evidence indicates that external pH may be involved in channel gating. Here we show that a tetraploid teleost, the Atlantic salmon, retains 4 aqp0 genes (aqp0a1, -0a2, -0b1, and -0b2), which are highly, but not exclusively, expressed in the lens. Functional characterization rev...

2012
SERAP DERMAN KADRIYE KIZILBEY BANU MANSUROGLU ZEYNEP MUSTAFAEVA

In this study the formation of water-soluble and water-insoluble complexes between bovine serum albumin (BSA) and biocompatible poly(N-vinyl-2-pyrrolidone-co-acrylic acid) (P(VP-co-AA); 2:1), anionic polymer, was studied at different protein, polymer concentrations and pH values. BSAP(VP-co-AA) complexes were studied by turbidimetric, gravimetric and chromatographic methods. Stability of the pr...

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