Mark Redwood - Academia.edu (original) (raw)
Papers by Mark Redwood
Biorefining of precious metals from wastes- an answer to manufacturing of cheap nanocatalysts for... more Biorefining of precious metals from wastes- an answer to manufacturing of cheap nanocatalysts for fuel cells and power generation via an integrated biorefinery?
Integrating dark and light bio-hydrogen production strategies: towards the hydrogen economy
International Journal of Hydrogen Energy, 2012
Link to publication on Research at Birmingham portal General rights Unless a licence is specified... more Link to publication on Research at Birmingham portal General rights Unless a licence is specified above, all rights (including copyright and moral rights) in this document are retained by the authors and/or the copyright holders. The express permission of the copyright holder must be obtained for any use of this material other than for purposes permitted by law. • Users may freely distribute the URL that is used to identify this publication. • Users may download and/or print one copy of the publication from the University of Birmingham research portal for the purpose of private study or non-commercial research. • User may use extracts from the document in line with the concept of 'fair dealing' under the Copyright, Designs and Patents Act 1988 (?) • Users may not further distribute the material nor use it for the purposes of commercial gain. Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.
Biotechnology Letters, 2010
Biotechnology and Bioengineering, 2008
Where a licence is displayed above, please note the terms and conditions of the licence govern yo... more Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.
Nonmagnetic and Magnetic Quantum Dots, 2018
The challenge of climate change promotes use of carbon neutral fuels. Biofuels are made via ixing... more The challenge of climate change promotes use of carbon neutral fuels. Biofuels are made via ixing carbon dioxide via photosynthesis which is ineicient. Light trapping pigments use restricted light wavelengths. A study using the microalga Botryococcus braunii (which produces bio-oil), the bacterium Rhodobacter sphaeroides (which produces hydrogen), and the cyanobacterium Arthrospira platensis (for bulk biomass) showed that photosynthetic productivity was increased by up to 2.5-fold by upconverting unused wavelengths of sunlight via using quantum dots. For large scale commercial energy processes, a 100fold cost reduction was calculated as the break-even point for adoption of classical QD technology into large scale photobioreactors (PBRs). As a potential alternative, zinc sulide nanoparticles (NPs) were made using waste H 2 S derived from another process that precipitates metals from mine wastewaters. Biogenic ZnS NPs behaved identically to ZnS quantum dots with absorbance and emission maxima of 290 nm (UVB, which is mostly absorbed by the atmosphere) and 410 nm, respectively; the optimal wavelength for chlorophyll a is 430 nm. By using a low concentration of citrate (10 mM) during ZnS synthesis, the excitation wavelength was redshifted to 315 nm (into the UVA, 85% of which reaches the earth's surface) with an emission peak of 425 nm, i.e., appropriate for photosynthesis. The potential for use in large scale photobioreactors is discussed in the light of current PBR designs, with respect to the need for durable UV-transmiting materials in appropriate QD delivery systems.
日本呼吸器学会雑誌, 2007
Macroalgae is a chlorophyll plant and its body is thallus and is able to live in polluted waters.... more Macroalgae is a chlorophyll plant and its body is thallus and is able to live in polluted waters. The research was conducted with the intention of knowing the content of chlorophyll pigment and comparing the concentration of chlorophyll on Kappaphycus alvarezii using the formula Jeffrey and Humprey (1975) and Harbone (1987). The results obtained to separate the chlorophyll pigment on Kappaphycus alvarezii using the thin layer chromatography (KLT) method, thus obtained the pigment identified from Kappaphycus alvarezii namely chlorophyll a.
Reviews in Environmental Science and Bio/Technology, 2008
Journal of Biotechnology, 2010
Journal of Biotechnology, 2008
International Journal of Hydrogen Energy, 2006
Biotechnology Letters, 2010
Biotechnology Letters, 2012
Biotechnology Letters, 2007
Bioresource Technology, 2012
Bioresource Technology, 2012
FEMS Microbiology Letters, 2008
Escherichia coli can perform at least two modes of anaerobic hydrogen metabolism and expresses at... more Escherichia coli can perform at least two modes of anaerobic hydrogen metabolism and expresses at least two types of hydrogenase activity. Respiratory hydrogen oxidation is catalysed by two 'uptake' hydrogenase isoenzymes, hydrogenase-1 and-2 (Hyd-1 and-2), and fermentative hydrogen production is catalysed by Hyd-3. Harnessing and enhancing the metabolic capability of E. coli to perform anaerobic mixed-acid fermentation is therefore an attractive approach for bio-hydrogen production from sugars. In this work, the effects of genetic modification of the genes encoding the uptake hydrogenases, as well as the importance of preculture conditions, on hydrogen production and fermentation balance were examined. In suspensions of resting cells pregrown aerobically with formate, deletions in Hyd-3 abolished hydrogen production, whereas the deletion of both uptake hydrogenases improved hydrogen production by 37% over the parent strain. Under fermentative conditions, respiratory H 2 uptake activity was absent in strains lacking Hyd-2. The effect of a deletion in hycA on H 2 production was found to be dependent upon environmental conditions, but H 2 uptake was not significantly affected by this mutation.
Electrodialysis (ED), an electrochemical membrane technique, prolonged and enhanced the productio... more Electrodialysis (ED), an electrochemical membrane technique, prolonged and enhanced the production of biohydrogen and purified organic acids (OAs) via anaerobic fermentation of glucose and food wastes. In this extractive fermentation, pH was precisely controlled by the regulated extraction of acidic products. The solid particles and inorganic salts present in real wastes were not problematic when hydrothermal pre treatment was incorporated. The selective separation of OA from waste-fed fermentations provides a nitrogen free carbon source for further biohydrogen production in a parallel photofermentation. H2 yield could be up to 10 fold enhanced by combining extractive fermentation and photofermentation. Therefore, ED provides the key link in an integrated process (IP) for efficient bioH2 production from organic wastes.
... formate. ....225 Figure 4.1-f The relationship between OD660 and culture density in Rhodobact... more ... formate. ....225 Figure 4.1-f The relationship between OD660 and culture density in Rhodobacter sphaeroides OU 001, grown on SyA medium.....226 Page 10. ...
Biorefining of precious metals from wastes- an answer to manufacturing of cheap nanocatalysts for... more Biorefining of precious metals from wastes- an answer to manufacturing of cheap nanocatalysts for fuel cells and power generation via an integrated biorefinery?
Integrating dark and light bio-hydrogen production strategies: towards the hydrogen economy
International Journal of Hydrogen Energy, 2012
Link to publication on Research at Birmingham portal General rights Unless a licence is specified... more Link to publication on Research at Birmingham portal General rights Unless a licence is specified above, all rights (including copyright and moral rights) in this document are retained by the authors and/or the copyright holders. The express permission of the copyright holder must be obtained for any use of this material other than for purposes permitted by law. • Users may freely distribute the URL that is used to identify this publication. • Users may download and/or print one copy of the publication from the University of Birmingham research portal for the purpose of private study or non-commercial research. • User may use extracts from the document in line with the concept of 'fair dealing' under the Copyright, Designs and Patents Act 1988 (?) • Users may not further distribute the material nor use it for the purposes of commercial gain. Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.
Biotechnology Letters, 2010
Biotechnology and Bioengineering, 2008
Where a licence is displayed above, please note the terms and conditions of the licence govern yo... more Where a licence is displayed above, please note the terms and conditions of the licence govern your use of this document. When citing, please reference the published version. Take down policy While the University of Birmingham exercises care and attention in making items available there are rare occasions when an item has been uploaded in error or has been deemed to be commercially or otherwise sensitive.
Nonmagnetic and Magnetic Quantum Dots, 2018
The challenge of climate change promotes use of carbon neutral fuels. Biofuels are made via ixing... more The challenge of climate change promotes use of carbon neutral fuels. Biofuels are made via ixing carbon dioxide via photosynthesis which is ineicient. Light trapping pigments use restricted light wavelengths. A study using the microalga Botryococcus braunii (which produces bio-oil), the bacterium Rhodobacter sphaeroides (which produces hydrogen), and the cyanobacterium Arthrospira platensis (for bulk biomass) showed that photosynthetic productivity was increased by up to 2.5-fold by upconverting unused wavelengths of sunlight via using quantum dots. For large scale commercial energy processes, a 100fold cost reduction was calculated as the break-even point for adoption of classical QD technology into large scale photobioreactors (PBRs). As a potential alternative, zinc sulide nanoparticles (NPs) were made using waste H 2 S derived from another process that precipitates metals from mine wastewaters. Biogenic ZnS NPs behaved identically to ZnS quantum dots with absorbance and emission maxima of 290 nm (UVB, which is mostly absorbed by the atmosphere) and 410 nm, respectively; the optimal wavelength for chlorophyll a is 430 nm. By using a low concentration of citrate (10 mM) during ZnS synthesis, the excitation wavelength was redshifted to 315 nm (into the UVA, 85% of which reaches the earth's surface) with an emission peak of 425 nm, i.e., appropriate for photosynthesis. The potential for use in large scale photobioreactors is discussed in the light of current PBR designs, with respect to the need for durable UV-transmiting materials in appropriate QD delivery systems.
日本呼吸器学会雑誌, 2007
Macroalgae is a chlorophyll plant and its body is thallus and is able to live in polluted waters.... more Macroalgae is a chlorophyll plant and its body is thallus and is able to live in polluted waters. The research was conducted with the intention of knowing the content of chlorophyll pigment and comparing the concentration of chlorophyll on Kappaphycus alvarezii using the formula Jeffrey and Humprey (1975) and Harbone (1987). The results obtained to separate the chlorophyll pigment on Kappaphycus alvarezii using the thin layer chromatography (KLT) method, thus obtained the pigment identified from Kappaphycus alvarezii namely chlorophyll a.
Reviews in Environmental Science and Bio/Technology, 2008
Journal of Biotechnology, 2010
Journal of Biotechnology, 2008
International Journal of Hydrogen Energy, 2006
Biotechnology Letters, 2010
Biotechnology Letters, 2012
Biotechnology Letters, 2007
Bioresource Technology, 2012
Bioresource Technology, 2012
FEMS Microbiology Letters, 2008
Escherichia coli can perform at least two modes of anaerobic hydrogen metabolism and expresses at... more Escherichia coli can perform at least two modes of anaerobic hydrogen metabolism and expresses at least two types of hydrogenase activity. Respiratory hydrogen oxidation is catalysed by two 'uptake' hydrogenase isoenzymes, hydrogenase-1 and-2 (Hyd-1 and-2), and fermentative hydrogen production is catalysed by Hyd-3. Harnessing and enhancing the metabolic capability of E. coli to perform anaerobic mixed-acid fermentation is therefore an attractive approach for bio-hydrogen production from sugars. In this work, the effects of genetic modification of the genes encoding the uptake hydrogenases, as well as the importance of preculture conditions, on hydrogen production and fermentation balance were examined. In suspensions of resting cells pregrown aerobically with formate, deletions in Hyd-3 abolished hydrogen production, whereas the deletion of both uptake hydrogenases improved hydrogen production by 37% over the parent strain. Under fermentative conditions, respiratory H 2 uptake activity was absent in strains lacking Hyd-2. The effect of a deletion in hycA on H 2 production was found to be dependent upon environmental conditions, but H 2 uptake was not significantly affected by this mutation.
Electrodialysis (ED), an electrochemical membrane technique, prolonged and enhanced the productio... more Electrodialysis (ED), an electrochemical membrane technique, prolonged and enhanced the production of biohydrogen and purified organic acids (OAs) via anaerobic fermentation of glucose and food wastes. In this extractive fermentation, pH was precisely controlled by the regulated extraction of acidic products. The solid particles and inorganic salts present in real wastes were not problematic when hydrothermal pre treatment was incorporated. The selective separation of OA from waste-fed fermentations provides a nitrogen free carbon source for further biohydrogen production in a parallel photofermentation. H2 yield could be up to 10 fold enhanced by combining extractive fermentation and photofermentation. Therefore, ED provides the key link in an integrated process (IP) for efficient bioH2 production from organic wastes.
... formate. ....225 Figure 4.1-f The relationship between OD660 and culture density in Rhodobact... more ... formate. ....225 Figure 4.1-f The relationship between OD660 and culture density in Rhodobacter sphaeroides OU 001, grown on SyA medium.....226 Page 10. ...