The level of blood catalase activity in heterozygotes for Japanese type acatalasemia was demonstrated to be about half of normal levels by means of titration and spectrophotometric methods. A distribution plot of catalase activities in heterozygous blood was completely separate from that of normal blood. Comparative analysis of the partially purified erythrocyte catalase preparations obtained f...

Background The mycobacterial catalase-peroxidases protect it from the reactive oxidative metabolites and allow its survival within the host phagocytes. We compared the virulence of Mycobacterium avium complex (MAC) clinical isolates with varying catalase activity recovered from the blood of HIV patients in terms of invasiveness and intracellular multiplicity in host cells. The catalase activity...

Effect of various concentrations of nickel (100, 200, 500 and 1000 microM) and recovery treatments of boron (50 and 100 microM) and copper (15 and 75 microM) each with 200 microM and 500 microM of nickel on germination, growth, biomass, chlorophyll, carotenoids, pheophytin, amylase, protein, sugar as well as activity of catalase and peroxidase were studied in radish (Raphanus sativus cv. Early ...

The catalase level of Bacteroides distasonis (ATCC 8503, type strain) varied with the amount of hemin supplied to the medium when the cells were grown in either a prereduced medium containing 0.5% peptone, 0.5% yeast extract, and 1% glucose or in a prereduced, defined heme-deficient medium. The effect of hemin on catalase production could not be duplicated by ferrous sulfate or ferrous ammonium...

Deinococcus radiodurans is characterized by its exceptional capacity to tolerate the effects of various DNA damaging agents due to presence of the extraordinary DNA repair mechanism. DNA double strand break repair in Deinococcus radiodurans follows biphasic kinetics. The phase I, a RecA independent phase appears to be a DNA protective and preparatory phase for RecA dependent phase II repair. Pp...

The effect of water stress on glutathione reductase and catalase activities was evaluated in leaf blades of field-grown winter wheat (Triticum aestivum L.). Wheat was sown at two seeding rates under both irrigated and dryland conditions. Flag leaves from dryland plants sown at 60 kilograms/hectare showed no change in either glutathione reductase or catalase activities per unit leaf area, while ...