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We optimized the conditions for oxidation of luminol by hydrogen peroxide in the presence of peroxidase (EC 1.11.1.7) from royal palm leaves (Roystonea regia).
      
The detection limit of the enzyme assay during luminol oxidation by hydrogen peroxide was 1 pM.
      
Glucose was added in immobilization mixture and hydrogen peroxide, which is the substrate of CAT, was produced in coupling mixture during immobilization time.
      
Therefore, co-immobilization of GOD and CAT was carried out in the presence of both their substrates: glucose and hydrogen peroxide, respectively.
      
The level of active oxygen species (AOS)-superoxide anion radical (O2·-) and hydrogen peroxide (H2O2)-in pea (Pisum sativum L.) cultivar Marat seedlings was studied upon their inoculation with symbiotic (Rhizobium leguminosarum bv.
      
The review sums up recent data on the key enzymes involved in hydrogen evolution.
      
Hydrogen release by cyanobacteria is due to the effects of nitrogenases and hydrogenases.
      
Cyanobacteria hold important practical implications as transformers of solar energy into molecular hydrogen viewed as a fuel.
      
The mutagenic effect of N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), mitomycin C, and hydrogen peroxide determined from the induction of E.
      
General toxicity was demonstrated by using luminescence inhibition for hydrogen peroxide, Zn2+, and Cd2+ at low concentrations.
      
The enzyme catalyzes the "oxidase" reaction (NADH oxidation) without peroxide and with the presence of Mn2+, which takes part in hydrogen peroxide production via Mn3+ and preserves the enzyme from inactivation.
      
Specific attention is given to regulation of enzymes of antioxidative defense, operating in the cells of strict anaerobes under the conditions of oxidative stress caused by oxygen, superoxide anion, or hydrogen peroxide.
      
For the problem of controlling predissociation of the hydrogen fluoride molecule, numerical results were presented.
      
Numerical results for the problem of selective control for energy of hydrogen molecules (H2) with different isotopes are represented.
      
Partial reduction resulting in highly reactive intermediates, namely, superoxide anion (O2·-), hydrogen peroxide (H2O2), and hydroxyl radical (·OH), is possible.
      
This enzyme uses hydrogen peroxide and chloride to catalyze hypochlorous acid formation.
      
We studied the effect of oxidative stress induced by hyperoxia, hydrogen peroxide, or menadione on leukemia P388 cells isolated from mice with early (4 days) and late (7 days) stages of tumor growth.
      
Activity of the peroxidase-hydrogen peroxide system is proposed as a biological marker of ecological risk of heavy metal contamination of the environment.
      
Neurotransmitters dopamine and serotonin as well as active oxygen species hydrogen peroxide and tert-butyl peroxide were used as chemical signals.
      
Possible Involvement of Hydrogen Peroxide and Salicylic Acid in the Legume-Rhizobium Symbiosis
      
 

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