The Functional Complexity of [NiFe] Hydrogenases in Sulfate Reducing Bacteria (Genus; Desulforvibrio spp)
Saidu Haruna,
Hamzat Ibiyeye Tijani,
Yusuf Hindatu,
Jibrin Ndejiko Mohammed,
Bashir Mohammed Abubakar,
Mohammed Sulaiman,
Abdulrahman Idris
Issue:
Volume 2, Issue 1, February 2014
Pages:
1-7
Received:
14 November 2013
Published:
30 December 2013
Abstract: Sulfate-reducing bacteria are categories of bacteria and archaea that can obtain energy by oxidizing organic compounds or molecular hydrogen (H2) while reducing sulfate (SO42−) to hydrogen sulfide (H2S). By analysis, these organisms "respire" sulfate rather than oxygen, a form of anaerobic respiration, the oxidation of hydrogen by the primary genus of Sulfate Reducing Bacteria (Desulfovibrio, Desulfovibrio desulfuricans) is catalyzed by enzymes called Hydrogenases. Three basic types of hydrogenases have been widely isolated from the primary genus of sulfate-reducing bacteria Desulfobibrio which differ in their structural subunits, metal compositions, physico-chemical characteristics, amino acid sequences, immunological activities, structural gene configuration and their catalytic properties. Broadly, hydrogenases can be considered as ‘iron containing hydrogenases and nickel-containing hydrogenases. The iron-sulfur-containing hydrogenase enzyme contains two ferredoxin-type (4Fe-4S) clusters and typical iron-sulfur center believed to be involved in the activation of H2 yet it is the most sensitive domain to CO and NO2−.eventhough it is not featured in all species of genus Desulfovibrio. The nickel-(iron-sulfur)-containing hydrogenases, [NiFe] hydrogenase posses two 4Fe-4S centers and one 3Fe-xS cluster in addition to nickel and have been found in all species of Desulfovibrio with strong resistance to CO and NO2- so far investigated. The genes encoding the large and small subunits of a periplasmic and membrane-bound species of the [NiFe] hydrogenase have been cloned in Escherichia coli and sequenced, however the functional complexity of the hydrogenase system remained unexplored as a result of the metabolic diversity in Desulfovibrio spp. The [NiFe] hydrogenase plays an important role in the energy metabolism of Desulfovibrio spp. Thus, the expression of the encoded structural genes would be an excellent marker for the metabolic functionalities under specific inducible environment.
Abstract: Sulfate-reducing bacteria are categories of bacteria and archaea that can obtain energy by oxidizing organic compounds or molecular hydrogen (H2) while reducing sulfate (SO42−) to hydrogen sulfide (H2S). By analysis, these organisms "respire" sulfate rather than oxygen, a form of anaerobic respiration, the oxidation of hydrogen by the primary genus...
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Male Age Effect on Male Remating and Fitness in Phorticella Striata
Issue:
Volume 2, Issue 1, February 2014
Pages:
8-14
Received:
10 January 2014
Published:
10 March 2014
Abstract: Male traits known to influence on female mating decision were also known to influence on male remating ability too. In Phorticella striata age of male effect on male remating and progeny production has been studied. It was noticed that middle aged male had greater percentage of remating than those of young and old males. In all the three male age classes male mated with two females in 1 hour had copulated significantly for longer time, mated females laid greater number of eggs and more progeny than male mated with one female in 1 hour. Further, among male mated with two females in 1 hour, male mated with 1st female copulated longer, mated female laid greater number of eggs and progeny production than male mateed with 2nd female in 1 hour. Thus, these studies in Phorticella striata suggests that male age has significant influence on male remating and progeny production. Middle aged male had greater remating and progeny production than young and old males.
Abstract: Male traits known to influence on female mating decision were also known to influence on male remating ability too. In Phorticella striata age of male effect on male remating and progeny production has been studied. It was noticed that middle aged male had greater percentage of remating than those of young and old males. In all the three male age c...
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The Study of Important Agronomic Traits by Multivariate Analysis in Winter Rapeseed Cultivars
Gader Ghaffari,
Farhad Baghbani
Issue:
Volume 2, Issue 1, February 2014
Pages:
15-17
Received:
6 January 2014
Published:
10 March 2014
Abstract: In order to group winter rapeseed cultivars according to evaluated traits, an experiment was conducted in the Research Greenhouse of Agriculture Faculty, University of Tabriz – IRAN. In the experiment were included 12 cultivars of winter rapeseed and 3 levels of water deficit stress. Gypsum blocks were used to monitor soil moisture. Water deficit stress was imposed from stem elongation to physiological maturity. According to the principal component analysis, five principal components were chosen with greater eigenvalue (more than 0.7) that are including 81.34% of the primeval variance of variables. The first component that explained the 48.02% of total variance had the high eigenvalue. The second component could justify about 13.64% of total variance and had positive association with leaf water potential and proline content and had negative relationship with leaf stomatal conductivity. The third, fourth and fifth components expressed around, 10.18, 4.83 and 4.68% of the total variance respectively. The third component had the high eigenvalue for plant dry weight. The fourth component put 1000-seed weight, seed yield, Silique per Plant and root dry weight against plant dry weight, chlorophyll fluorescence and leaf water potential. The fifth component had the high eigenvalue for root dry weight, root volume and 1000-seed weight.
Abstract: In order to group winter rapeseed cultivars according to evaluated traits, an experiment was conducted in the Research Greenhouse of Agriculture Faculty, University of Tabriz – IRAN. In the experiment were included 12 cultivars of winter rapeseed and 3 levels of water deficit stress. Gypsum blocks were used to monitor soil moisture. Water deficit s...
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