Isoenzyme profiles of peroxidase [EC 1.11.1.7], superoxide dismutase (SOD)[EC 1.15.1.1] and catalase [EC 1.11.1.6] in the endosperm and roots of wheat seedlings germinated under chronic stress conditions were investigated. Low and high temperature, 0.2 M NaCl and 0.5 M sucrose were applied as stress factors. Germination of seeds in the presence of ABA was used as a dehydration stress confirming...

Prominent staining of rat hepatic microbodies was obtained by incubating sections of aldehyde-fixed rat liver in a modified Graham and Karnovsky's medium for ultrastructural demonstration of peroxidase activity. The electron-opaque reaction product was deposited uniformly over the matrix of the microbodies. The microbodies were identified by their size, shape, presence of tubular nucleoids, and...

A photoresponsive nanozyme with peroxidase- and catalase-like activities, photodynamic photothermal properties is designed in article number 2007090 by Huiyu Liu co-workers. Its synergistic catalytic therapy dual phototherapy show unique advantages for tumor treatment.

Strong antioxidant activity of Pelargonium graveolens is well known. The question addressed in this study was whether different concentrations of exogenous ascorbic acid (AsA) and iron (Fe) were able to influence antioxidant activity and total phenol content (TPC) of geranium. Thus, three levels of Fe (0, 20 and 40 µM) and three levels of AsA (0, 1 and 2 mM) in nutrient solution were c...

Alkyl hydroperoxide reductase subunit C (AhpC) is the catalytic subunit responsible for alkyl peroxide metabolism. A Xanthomonas ahpC mutant was constructed. The mutant had increased sensitivity to organic peroxide killing, but was unexpectedly hyperresistant to H(2)O(2) killing. Analysis of peroxide detoxification enzymes in this mutant revealed differential alteration in catalase activities i...

Uterine leiomyomas are benign soft-tissues tumors that arise from uterine smooth muscle tissue. Etiopathogenesis of leiomyomas is not well understood. We aimed to examine whether antioxidant enzyme activities and lipid hydroperoxides level in patients with leiomyoma are influenced by changes in sex hormones and gonadotropins (estradiol (E2), progesterone, FSH, and LH) during menstrual cycle and...

The reactions of the fungal enzymes Arthromyces ramosus peroxidase (ARP) and Phanerochaete chrysosporium lignin peroxidase (LiP) with hydrogen peroxide (H(2)O(2)) have been studied. Both enzymes exhibited catalase activity with hyperbolic H(2)O(2) concentration dependence (K(m) approximately 8-10 mm, k(cat) approximately 1-3 s(-1)). The catalase and peroxidase activities of LiP were inhibited w...

Bernhard Epping, Alexander P. Hansen and Peter Martin Institut für Pflanzenernährung (330), Fruwirthstr. 20, Universität Hohenheim, 70593 Stuttgart, Bundesrepublik Deutschland Z. Naturforsch. 50 c, 543-551 (1995); received March 15/May 2, 1995 Oxygen Derivates, Phaseolus vulgaris L.. Rhizobium leguminosarum, Rhizobium tropici, Symbiotic Effectivity Nodules of Rhizobium leguminosarum bv. phaseol...