Reductioii of Dehydroascorbic Acid by Bacteria 2. ROLE OF CYTOCHROME IN HYDROGEN TRANSPORT BY B. P. EDDY, M. INGRAM

A Study on the Antibacterial Activity of Lactic Acid Bacteria Isolated from Traditional Iranian Milk Samples

198 Lactic acid bacteria (LAB) were isolated from Iranian milk samples. Almost all isolatedLAB showed inhibitory activity towards E. coli and S. aureus as Gram negative and Grampositive indicators, respectively. No role was observed for hydrogen peroxide in the activity ofall isolated strains while organic acids proved a prominent role in all detected inhibitoryactivities. Within isolated LAB, ...

Observations on the use of Escherichia coli for the reduction and estimation of dehydroascorbic acid.

Mechanism of ascorbic acid oxidation by cytochrome b(561).

The 1 equiv reaction between ascorbic acid and cytochrome b(561) is a good model for redox reactions between metalloproteins (electron carriers) and specific organic substrates (hydrogen-atom carriers). Diethyl pyrocarbonate inhibits the reaction of cytochrome b(561) with ascorbate by modifying a histidine residue in the ascorbate-binding site. Ferri/ferrocyanide can mediate reduction of DEPC-t...

The comparison of digestibility of treated sugarcane tops silage by bacteria or whole microorganisms of Holstein cow and buffalo rumen

The aim of this study was to evaluate the effects of adding sulfuric acid to sugarcane topssilage on rumen bacteria and whole rumen microorganisms (WRM) and compare the digestibility of sugarcane tops treated with different amount of urea, molasses and sulfuric acid between Holstein cow and Khouzestan buffalo. Regardless of the type of the treatment, potential of gas production (B) by cow WRM (...

Metabolic activation and DNA adduct formation of Benzo(a) pyrene by adult and newborn rat skin and liver microsomes

Benzo(a) pyrene is a carcinigen polycyclic aromatic hydrocarbon which diffuses into the environment from combustion of organic meterials.based on various epidemiological evidences it is related to lung,skin and liver cancer.mutagenicity,and immunosuppressivety are among important biological effects of Benzo(a) pyrene.after absorbtion and distribution in the body,it undergoes epoxidation by cyto...