Male NMRI mice were fed a diet with 10% w/w Beromegan for up to three weeks. Beromegan is a commercial fish (salmon) oil preparation rich in eicosapentaenoic acid and docosahexaenoic acid. Peroxisomal beta-oxidation capacity, catalase activity, and ultrastructural morphometry of the hepatic peroxisomes were investigated. In myocardium and kidney, catalase activity, peroxisomal staining after ca...

Peroxidatic activity of catalase (E .C .1 .11 .1 .6) was discovered by Keilin and Hartree (1), and it has been firmly established that, catalase oxidizes various substrates such as ethanol, methanol, nitrite, and formate (2-4) . Crystalline beef liver catalase, used as an enzyme tracer (5), and the peroxisomal catalase (6, 7) have been visualized cytochemically by a modification of the 3,3'diam...

In this study, an assay that combines the ease and simplicity of the qualitative approach for measuring catalase activity was developed. The assay reagents comprised only hydrogen peroxide and Triton X-100. The enzyme-generated oxygen bubbles trapped by Triton X-100 were visualized as foam, whose height was estimated. A calibration plot using the defined unit of catalase activity yielded the be...

A new bromoperoxidase-catalase was purified from the chloramphenicol-producing actinomycete Streptomyces venezuelae ISP 5230. The homogeneous enzyme showed brominating activity, catalase activity and a very low peroxidase activity. The spectral properties and pH dependence of the catalase activity showed similarities to conventional catalases. In contrast to other haem-bromoperoxidases, the bro...

The kidney carcinoma of the leopard frog has served for various studies on catalase activity, as a first step in gaining information on enzymatic properties of neoplasms in cold blooded animals. It was found that the activity level of this tumor is reduced to approximately 13 per cent of that of the normal frog's kidney. Systemic effects of the tumor on catalase activity of liver and kidney are...

Retinal photoreceptors and retinal pigment epithelial (RPE) cells are among the cell types that are sensitive to poisoning with methanol and its toxic metabolite formic acid. When exposed to formic acid in vitro, cultured cell lines from photoreceptors (661W) and the RPE (ARPE-19) were previously shown to accumulate similar levels of formate, but cytotoxic effects are greater in 661W cells. Her...

There has been some diiïereiice of opinion as to whether there is an association between catalase activity and respiration. In 1910 Appleman (1) ^ noted a correlation between the two in the potato tuber and later (2) observed the same thing in potato tubers manipulated in various ways to modify respiration and in stem and seed ends of the same tuber. He found a similar correlation in stored swe...

in this research, catalase activity and leaf chlorophyll stability of satsuma mandarin on some citrus rootstocks under waterlogging condition were studied. experiment was conducted as factorial with randomized complete blocks and 6 replications. the first factor, include 7 soils from east mazandaran and the second factor included 7 different citrus rootstocks: 1. sour orange, 2. swingle citrome...

Betalains are a group of nitrogen-containing pigments that color plants in most families of Caryophyllales. Their biosynthesis has long been proposed to begin with hydroxylation of L-tyrosine to L-DOPA through monophenolase activity of tyrosinase, but biochemical evidence in vivo remains lacking. Here we report that a Group 4 catalase, catalase-phenol oxidase (named as AcCATPO), was identified,...