Yazar "Kahyaoglu, M." seçeneğine göre listele

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    Biohydrogen Production from Waste Substrates as a Clean Energy
    (Taylor & Francis Inc, 2012) Kahyaoglu, M.; Sahin, O.; Saka, C.
    Demand of energy is increasing continuously due to rapid development in industrialization, population, economic growth, and rising living standards. Therefore, energy production is very important for living things, human and industrial activities. Hydrogen is a clean energy that has a great potential to be an alternative fuel. Hydrogen is an environmentally friendly fuel that possesses a high energy yield, provides clean energy generation without pollution when burned in air, and produces no greenhouse gases when combusted. It is an odorless, colorless, tasteless, and non-poisonous gas. Hydrogen is a sustainable energy system, which is produced from available sources and is used in every application where fossil fuels are being used in transportation, residential, commercial, and industrial sectors, and for electricity generation. In nature, some microorganisms with biological processes can produce hydrogen gas. In this review, biohydrogen production from industrial waste substrate, microbial producers, bioprocessing strategies, and the recent developments are discussed with their relative advantages.
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    Öğe
    Determination of antimicrobial and antioxidant activities of Turkish endemic Ajuga chamaepitys (L.) Schreber subsp euphratica PH Davis (Lamiaceae)
    (Academic Journals, 2010) Turkoglu, S.; Turkoglu, I.; Kahyaoglu, M.; Celik, S.
    In this study, the antioxidant and antimicrobial activities of methanol, water and chloroform extracts of Ajuga chamaepitys were investigated. The antioxidant properties of A. chamaepitys extracts were evaluated using different antioxidant tests, such as ABTS center dot radical scavenging capacity, DPPH center dot radical scavenging capacity, superoxide anion radical scavenging, hydrogen peroxide scavenging and metal chelating activities. These various antioxidant activities were compared with synthetic antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and alpha-tocopherol. The water extract of A. chamaepitys exhibited the higher antioxidant capacity than that of methanol and chloroform. In addition, total phenolic compounds in the extracts of A. chamaepitys were determined as pyrocatecol equivalents. Antimicrobial activity tests were carried out using disc diffusion methods with six bacteria strains and two yeast species. The obtained results indicate that A. chamaepitys is a potential source of natural antioxidant.
  • [ X ]
    Öğe
    Determination of antimicrobial and antioxidant activities of Turkish endemic Ajuga chamaepitys (L.) Schreber subsp. euphratica P.H. Davis (Lamiaceae)
    (2010) Turkoglu, S.; Turkoglu, I.; Kahyaoglu, M.; Celik, S.
    In this study, the antioxidant and antimicrobial activities of methanol, water and chloroform extracts of Ajuga chamaepitys were investigated. The antioxidant properties of A. chamaepitys extracts were evaluated using different antioxidant tests, such as ABTS· radical scavenging capacity, DPPH· radical scavenging capacity, superoxide anion radical scavenging, hydrogen peroxide scavenging and metal chelating activities. These various antioxidant activities were compared with synthetic antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and ?-tocopherol. The water extract of A. chamaepitys exhibited the higher antioxidant capacity than that of methanol and chloroform. In addition, total phenolic compounds in the extracts of A. chamaepitys were determined as pyrocatecol equivalents. Antimicrobial activity tests were carried out using disc diffusion methods with six bacteria strains and two yeast species. The obtained results indicate that A. chamaepitys is a potential source of natural antioxidant. © 2010 Academic Journals.