cept for the first time, has probably wondered why chemists employ a scale for measuring hydrogen ion concentration which decreases in value as the concentration of the H+ ion increases and vice versa in other words, a scale in which a solution of pH = 1 is actually more acidic, rather than less acidic, than a solution having a pH = 14. The less mathematically inclined are also likely to be puz...

High temperature environment causes detrimental effects on health. In the present study, the effects of intake of several kinds of beverage on blood components during exercise under the high temperature environment were evaluated. The 10 subjects were student of the H University. Exercise intensity was 50-60% O2maxx and treadmill exercise was continued for 1 h. The kinds of beverage were water,...

Ever since Henderson in 1908 introduced Guldberg & Waage’s Law of Chemical Equilibrium (1867) in biology applied to the dissociation of carbonic acid, new studies on the first dissociation exponent of carbonic acid in plasma have appeared in the literature. (Hasselbalch 1916, Warburg 1922, Hastings, Sendroy & Van Slyke 1928 and Severinghaus, Stupfel & Bradley 1956). There is, however, still dis...

In a previous paper (1) the inactivation of catalase by heat at different pH was studied. It was discovered that the heat inactivation depends upon the hydrogen ion concentration of the enzyme solution which affects both the velocity and the extent of the reaction. It was also found there that 65” was the critical temperature for the enzyme preparation since at this temperature the catalase was...

IN a recent paper [1932] the writer presented data upon the rate of formation of enterokinase from its precursor in the pancreas. It was found that the observed rate conforms to the unimolecular expression and that it is a function of the hydrogen ion concentration of the medium, exhibiting a maximum at about PH 6-90. Certain additional experiments which have been carried out are now described....

Safferman, Robert S. (Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio), and Mary-Ellen Morris. Growth characteristics of the blue-green algal virus LPP- 1. J. Bacteriol. 88:771-775. 1964.-The blue-green algal (BGA) virus, strain LPP-1, formed two distinct plaque variants. During subsequent propagation, each of the isolated variants eventually reverted to a mixture of both plaque ty...

Following a study of the spectrophotometric properties of ortho-tolidine and its oxidation products, with particular attention to variation brought about by change in the hydrogen ion concentration, a method for the quantitative estimation of haemoglobin in serum and urine in which ortho-tolidine is substituted for benzidine in a peroxidase system is described. The method is designed to measure...

In a previous paper (1) the inactivation of catalase by heat at different pH was studied. It was discovered that the heat inactivation depends upon the hydrogen ion concentration of the enzyme solution which affects both the velocity and the extent of the reaction. It was also found there that 65” was the critical temperature for the enzyme preparation since at this temperature the catalase was...

A technic is described for collecting arterialized capillary blood in a small heparinized polyethylenecentrifuge tube. The pH is measuredafter dilution and injection into a BeckmanmicrobloodpH Assembly. Dilution of the blood with saline results in an averageincreaseof 0.027 pH units. This changein pH on dilution is eliminated by inclusionof calcium in the diluent. The pH of capillary blood draw...

A study of the effect of acetamide as an accelerator of the reaction between free bilirubin and diazotized sulfanilic acid (DSA) has led to its use in a method for serum bilirubin which is simple, sensitive, linear over a wide range, and which requires neither excessive dilution nor protein precipitation. The conditions necessary for greatest sensitivity and for linearity have been established ...