H+ titration studies on oxygenated and deoxygenated haemoglobins from carp, rainbow trout, spiny dogfish and pig are reported, and compared with Hb-H+ equilibria in other species and structural information deduced from amino acid sequences. The buffer values of oxygenated and deoxygenated teleost haemoglobins are low in comparison with elasmobranch and mammalian haemoglobins. This correlates wi...

1. The rate of growth of fibroblasts is markedly modified by slight changes in the hydrogen ion concentration of the medium. The curves expressing the rate of growth in function of the hydrogen ion concentration of the medium are nearly symmetrical on both sides of the maximum. 2. The optimum growth of fibroblasts occurs at pH 7.4 to 7.8. A slight change from this reaction has a remarkable infl...

For more precise control of plasma etching processes, a better understanding of interaction of ions and radicals contained in plasmas with Si, SiO2 and SiN surfaces is desirable. In this study, mass-analyzed ion beam experiments were employed to clarify hydrogen effects during plasmas etching process containing hydrogen such as HBr and hydrofulorocarbon. It has been shown that H + ion injection...

Complex formation and intermolecular excited-state proton transfer (ESPT) between a dihydroxy-1,8-naphthalimide photoacid and organic bases are investigated in polar aprotic solvents. First, quantum chemical calculations are used to explore the acid-base and spectroscopic properties and to identify energetically favorable complexes. The two hydroxyl groups of the photoacid enable stepwise forma...

An experimental defect in urinary acidification was induced in the isolated turtle bladder by amphotericin B and the nature of the defect was examined. Net hydrogen ion secretion was little affected by amphotericin when passive electrochemical forces across the epithelium were held at a minimum in the short-circuited state under isohydric conditions. Hydrogen ion secretion against a gradient, h...

1. Under the conditions of these experiments, there appears to be a distinct and constant difference in the final hydrogen ion concentration of Streptococcus haemolyticus from human and bovine sources. 2. Of 124 strains of Streptococcus haemolyticus from known human origin, 116 reached a final hydrogen ion concentration of from pH 5.0 to 5.3. Only 8 reached a pH more acid than 5.0 and none more...

The production of hydrogen ions during the hydrolysis of ATP by myosin B and the consequent fall in pH can produce alterations in enzymatic activity directly, or by influencing Ca ion concentrations controlled by metal-chelate systems. Adequate hydrogen ion buffer systems can limit pH changes to acceptable levels. However, several commonly used hydrogen ion buffers have been reported to have sp...

1. Previous studies of the ventilatory response to metabolic acidosis have usually considered only patients with arterial blood pH above 7-10. To define the response during more severe acidaemia, arterial CO, tension and pH were measured in fifty-three episodes of diabetic ketoacidosis, including twenty-four with pH below 7-10, and ten with pH below 7.00. 2. The relation between arterial CO, te...

H ion was generated through two processes within a volume Csfree source. The density of molecule hydrogen gas will impact on the electron temperature within the primary discharge chamber that will influence the population of vibrational excited H2. Within the extraction region, the interaction between molecule hydrogen and H ion will is cause the dissociation of negative ion. To better understa...

Amorphous hydrogenated carbon (a-C:H) films offer a wide range of applications due to their extraordinary material properties like high hardness, chemical inertness and infrared transparency. The films are usually deposited in low temperature plasmas from a hydrocarbon precursor gas, which is dissociated and ionized in the plasma and radicals and ions impinging onto the surface leading to film ...