Given significant challenges with available measurements of aerosol acidity, proxy methods are frequently used to estimate the acidity of atmospheric particles. In this study, four of the most common aerosol acidity proxies are evaluated and compared: (1) the ion balance method, (2) the molar ratio method, (3) thermodynamic equilibrium models, and (4) the phase partitioning of ammonia. All meth...

This in vitro study sought to evaluate nine different sport and energy drinks (B Star Energy drink, London Best Energy Drink, Hippo Energy drink, Lucozade Boost Energy fast, Hype Energy, Vita 500 Energy drink, Lucozade Sport, Power horse Energy drink and Red Bull Energy drink) in terms of initial pH and titratable acidity. Initial pH was measured in triplicate for the nine beverages. The titrat...

Development, reproduction and acaricide susceptibility of Tetranychus cinnabarinus (Boisduvals) (Acari: Tetranychidae) were investigated after long-term (about 40 generations) exposure to various levels of acid rain; pH 2.5, 3.0, 4.0, and 5.6. Deionized water (pH 6.8) served as a control. The mites were reared on eggplant leaves at 28 degrees C, 80%RH and a photoperiod of 14:10 (L:D) in the lab...

Manipulation of the extracellular and/or intracellular pH of tumors may have considerable potential in cancer therapy. The extracellular space of most tumors is mildly acidic, owing to exuberant production of lactic acid. Aerobic glycolysis - attributable largely to chronic activation of hypoxia-inducible factor-1 (HIF-1) - as well as tumor hypoxia, are chiefly responsible for this phenomenon. ...

OBJECTIVES To evaluate in vitro the endogenous pH, titratable acidity and total soluble solid content (TSSC) of mouthwashes available in the Brazilian market. METHODS The study sample was composed of 10 commercial brands of mouthwashes based on different active ingredients: Cepacol(R), Clinerize(R), Equate(R), Listerine Cool Citrus(R), Oral-B(R), Periogard(R), Peroxyl(R), Plax Overnight(R), P...

Studies were conducted to evaluate the combined effects of spontaneous fermentation and amylase-rich flours (ARF) on some nutritive value, functional and viscoelastic properties of cowpea-fortified nixtamalized maize. A 2 x 3 x 3 factorial design, with fermentation medium, fermentation time and ARF level, was performed. The blends were fermented for the specific times and analysed for their tit...

ANNALS OF OPHTHALMOLOGY 5, 2014 The acid–base balance is a part of human homeostasis. Cells and tissues of the human body are susceptible to pH change: stability of molecular structures and enzyme activity can be maintained only in the tolerable range of pH. The maintenance of the acid–base balance is vital biochemical parameter required for normal physiology, and its change is associated with ...

As a new approach, the acidity that wood exhibits under moderate conditions is assayed by stimulated dissociation of weak wood acids in lightly basic secondary phosphate solutions. To assure a sufficient dissociation of hardly soluble weak acids in the solution, the amount of wood suspended in Na(2)HPO(4) solutions should be small but vary depending on the degree of acidity of wood species. How...

The cactus prickly pears rich in micronutrients, has recently generated a great deal of consumer interest, therefore, this paper was designed to study its physical and chemical compositions such as: moisture, sugar content, total fibres, protein, ash, pH, acidity, minerals contents and total phenolics contents of nine prickly pear juices. Polyphenols are antioxidants who contribute to the nutri...

A low pH and a high titratable acidity of juices and cola-based beverages are relevant factors that contribute to dental erosion, but the relative importance of these properties to maintain salivary pH at demineralizing levels for long periods of time after drinking is unknown. In this crossover study conducted in vivo, orange juice, a cola-based soft drink, and a 10% sucrose solution (negative...