ACTIVITY CHARACTERISTICS OF SULFATE REDUCING BACTERIA AND FORMATION MECHANISM OF HYDROGEN SULFIDE

Fractionation of Hydrogen Isotopes by Sulfate- and Nitrate-Reducing Bacteria

Hydrogen atoms from water and food are incorporated into biomass during cellular metabolism and biosynthesis, fractionating the isotopes of hydrogen-protium and deuterium-that are recorded in biomolecules. While these fractionations are often relatively constant in plants, large variations in the magnitude of fractionation are observed for many heterotrophic microbes utilizing different central...

Hydrogen Sulfide Production by Bacteria and Sulfmyoglobin Formation

Meat stored at 1 to 2 C under low oxygen tensions, either in gas-impermeable packs or in controlled atmospheres, occasionally exhibited an undesirable green exudate. The green pigment was identified spectrophotometrically as sulfmyoglobin. The conversion of myoglobin to sulfmyoglobin resulted from the production of H2S by bacteria tentatively identified as Pseudomonas mephitica. This organism p...

Kinetics of Colony Formation by Sulfate-Reducing Bacteria

The colony formation of sulfate-reducing bacteria, Desulfovibrio desulfuricans and Desulfotomaculum orientis, on agar plates well fitted the theoretical curve of the FOR model proposed by Hattori (1985) The estimates of A for both strains dropped from 5 to I day-1 with cultivation in a liquid medium or starvation in a buffer solution, while that of tr was not affected so much The estimates of h...

Hydrogen-utilizing, sulfate-reducing bacteria in marine sediments.

antioxidant and antimicrobial activity of allium jesdianum extract

چکیده بررسی فعالیت ضد اکسیدانی و ضدمیکروبی عصاره گیاه بن سرخ (allium jesdianum) به کوشش: زهرا مقیمی هدف از این تحقیق بررسی میزان ترکیبات فنولی کل، ترکیبات فلاوونوئیدی کل، فعالیت ضداکسیدانی و ضدمیکروبی عصاره ی گیاه تازه و خشک بن سرخ بود. استخراج عصاره به روش های غوطه وری، استفاده از همزن مغناطیسی، دستگاه مایکروویو، امواج فراصوت و گرمادهی مقاومتی و با استفاده از متانول، اتانول و آب به عنوا...