Trapping of molecular hydrogen at surfaces via translational-rotational energy conversion

1983 ◽  
Vol 27 (1) ◽  
pp. 9-14 ◽  
Author(s):  
S. Andersson ◽  
J. Harris
Keyword(s):  
Energy Conversion ◽  
Molecular Hydrogen ◽  
Rotational Energy

Rotational energy relaxation in molecular hydrogen

1975 ◽  
Vol 63 (8) ◽  
pp. 3532-3542 ◽  
Author(s):  
Herschel Rabitz ◽  
S.‐H. Lam
Keyword(s):  
Molecular Hydrogen ◽  
Energy Relaxation ◽  
Rotational Energy

Mutants of the Cyanobacterium Anabaena variabilis Altered in Hydrogenase Activities

1995 ◽  
Vol 50 (7-8) ◽  
pp. 505-510 ◽  
Author(s):  
Lidia E. Mikheeva ◽  
Oliver Schmitzh ◽  
Sergey V. Shestakov ◽  
Hermann Bothe
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Molecular Hydrogen ◽  
Growth Characteristics ◽  
Anabaena Variabilis ◽  
Lower Activity ◽  
Potential Applications ◽  
Cyanobacterium Anabaena ◽  
Uptake Activity ◽  
Phenazine Methosulphate

Abstract Two mutants of the cyanobacterium Anabaena variabilis impaired in the utilization or formation of molecular hydrogen have been obtained by nitroso-guanidine mutagenesis. Cul­tures of both mutants did not show alterations in the growth characteristics or in the hetero­cysts frequency but evolved molecular hydrogen from nitrogenase with enhanced rates. Ac­tivity measurements in extracts showed that one mutant (PK84) did not perform Na2S2O4- dependent H2-formation and was, therefore, unable to express an active bidirectional hydro­genase. Both mutants (PK84, PK 17R) were characterized by lower activity of phenazine-methosulphate-dependent H2-uptake when extracts were assayed from younger cultures. In older cells, particularly when grown with nitrate in the medium , this H2-uptake activity was, how ever, enhanced. Both mutants are likely affected in regulatory hydrogenase genes. The mutant PK84 offers perspectives for potential applications in solar energy conversion programs.

Rotational energy conversion and thermal evolution of neutron stars

2017 ◽  
Vol 41 (12) ◽  
pp. 125104 ◽  
Author(s):  
Cui Zhu ◽  
Xia Zhou ◽  
Na Wang
Keyword(s):  
Neutron Stars ◽  
Energy Conversion ◽  
Thermal Evolution ◽  
Rotational Energy

Cu(001) to HD energy transfer and translational to rotational energy conversion on surface scattering

2001 ◽  
Vol 115 (16) ◽  
pp. 7713-7724 ◽  
Author(s):  
L. V. Goncharova ◽  
J. Braun ◽  
A. V. Ermakov ◽  
G. G. Bishop ◽  
D.-M. Smilgies ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Energy Conversion ◽  
Rotational Energy ◽  
Surface Scattering

scholarly journals Maximizing Hydrogen Production by Cyanobacteria

2008 ◽  
Vol 63 (3-4) ◽  
pp. 226-232 ◽  
Author(s):  
Hermann Bothe ◽  
Stefanie Winkelmann ◽  
Gudrun Boison
Keyword(s):  
Energy Source ◽  
Hydrogen Production ◽  
Solar Energy ◽  
Energy Conversion ◽  
Molecular Hydrogen ◽  
Solar Energy Conversion ◽  
Clean Energy ◽  
Anabaena Variabilis ◽  
High Concentrations ◽  
Clean Energy Source

When incubated anaerobically, in the light, in the presence of C2H2 and high concentrations of H2, both Mo-grown Anabaena variabilis and either Mo- or V-grown Anabaena azotica produce large amounts of H2 in addition to the H2 initially added. In contrast, C2H2- reduction is diminished under these conditions. The additional H2-production mainly originates from nitrogenase with the V-enzyme being more effective than the Mo-protein. This enhanced H2-production in the presence of added H2 and C2H2 should be of interest in approaches to commercially exploit solar energy conversion by cyanobacterial photosynthesis for the generation of molecular hydrogen as a clean energy source

Artificial cells containing sustainable energy conversion engines

2019 ◽  
Vol 3 (5) ◽  
pp. 573-578 ◽  
Author(s):  
Kwanwoo Shin
Keyword(s):  
Energy Conversion ◽  
Nicotinamide Adenine Dinucleotide ◽  
Sustainable Energy ◽  
Living Cells ◽  
Energy Transduction ◽  
Artificial Cells ◽  
Energy Conversion Process ◽  
Metabolic Reactions ◽  
Metabolic Activities ◽  
Reduced Nicotinamide Adenine Dinucleotide

Living cells naturally maintain a variety of metabolic reactions via energy conversion mechanisms that are coupled to proton transfer across cell membranes, thereby producing energy-rich compounds. Until now, researchers have been unable to maintain continuous biochemical reactions in artificially engineered cells, mainly due to the lack of mechanisms that generate energy-rich resources, such as adenosine triphosphate (ATP) and reduced nicotinamide adenine dinucleotide (NADH). If these metabolic activities in artificial cells are to be sustained, reliable energy transduction strategies must be realized. In this perspective, this article discusses the development of an artificially engineered cell containing a sustainable energy conversion process.

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