Influence of the degree and mode of light limitation on growth characteristics of the Rhodobacter capsulatus continuous cultures

Tsygankov, Anatoly A.; Laurinavichene, Tatyana V.

doi:10.1002/(sici)1097-0290(19960905)51:5<605::aid-bit13>3.0.co;2-g

Cited by 35 publications

(14 citation statements)

References 18 publications

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“…In Rb. capsulatus, this value coincided with the saturating light intensity for growth [91]. For cultures with cell concentrations above 1 g L -1 , the saturating light intensity was considerably higher and strongly depended on the illumination method and the shape of the photobioreactor, which was related to the self shading within the cultures.…”

Section: Factors Affecting Hydrogen Production Rates In Purple Bacteriamentioning

confidence: 58%

“…The optimal pH values required for growth and for hydro gen production were also found to coincide; usually, they were in the range of 6.5-8.5 [91]. A known exception is Rps.…”

Section: Factors Affecting Hydrogen Production Rates In Purple Bacteriamentioning

confidence: 83%

“…Purple bacteria are fairly efficient in utilizing the energy of organic compounds and light. Some data suggest that up to 30% of energy consumed by purple bacteria from lactate and light is stored as biomass [91]. Our further discussion will employ the criterion of specific hydrogen production rates.…”

Section: Comparison Of Potential and Practically Relevant Ratesmentioning

confidence: 99%

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Hydrogen in metabolism of purple bacteria and prospects of practical application

Цыганков

Khusnutdinova

2015

Microbiology

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Purple bacteria are able to use H 2 for photoautotrophic, photomixotrophic, and chemoau totrophic growth, exhibiting high metabolic lability. Depending on the type of metabolism, hydrogen may be consumed with release of energy and/or reductive equivalents. Purple bacteria may also release H 2 as a ter minal electron acceptor or in the course of dinitrogen fixation. Thus, hydrogen metabolism in purple bacteria is diverse; these bacteria are often used as models for investigation of the metabolic traits and interrelation of the metabolic pathways involving molecular hydrogen. In this review, the present day state of investigation of hydrogen metabolism in purple bacteria is reflected and its possible practical applications are discussed. Nitrogenase and hydrogenase, the major key enzymes of hydrogen metabolism, are discussed in brief. A gen eralized scheme of H 2 role in the metabolism of purple bacteria is presented. Experimental approaches for investigation of the rates of hydrogen production are discussed. Immobilized systems are noted as the most promising approach for development of model systems for hydrogen production.

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Section: Factors Affecting Hydrogen Production Rates In Purple Bacteriamentioning

confidence: 58%

“…The optimal pH values required for growth and for hydro gen production were also found to coincide; usually, they were in the range of 6.5-8.5 [91]. A known exception is Rps.…”

Section: Factors Affecting Hydrogen Production Rates In Purple Bacteriamentioning

confidence: 83%

Section: Comparison Of Potential and Practically Relevant Ratesmentioning

confidence: 99%

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Hydrogen in metabolism of purple bacteria and prospects of practical application

Цыганков

Khusnutdinova

2015

Microbiology

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“…The specific growth rate (m, /s) of a continuous Rhodobacter capsulatus culture was reported to increase linearly with the incident light intensity I up to 30 W/m 2 (Tsygankov and Laurinavichene, 1996). The specific growth rate (m, /s) of a continuous Rhodobacter capsulatus culture was reported to increase linearly with the incident light intensity I up to 30 W/m 2 (Tsygankov and Laurinavichene, 1996).…”

Section: Yield Maintenance and Photosynthetic Heat Dissipation Coefmentioning

confidence: 96%

“…The dependency of the specific growth rate of Rhodobacter capsulatus on the incident light intensity was estimated from literature data (Tsygankov and Laurinavichene, 1996). The pseudo steady-state criterion m ¼ D was validated during all experiments.…”

Section: D-stat Experimentsmentioning

confidence: 99%

Controlling light‐use by Rhodobacter capsulatus continuous cultures in a flat‐panel photobioreactor

Hoekema¹,

Douma²,

Janssen³

et al. 2007

Biotech & Bioengineering

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Health care costs have risen enormously in recent years. You can help create and maintain performance measures that influence how senior leaders perceive health care costs and how they make funding decisions with respect to programs intended to reduce those costs. In particular, this article explains how to implement a comprehensive corporate wellness program (CWP) and a performance measurement system called a wellness scorecard, which can be used to track CWPs. © 2012 Wiley Periodicals, Inc.

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Controlling light-use byRhodobacter capsulatus continuous cultures in a flat-panel photobioreactor

Hoekema¹,

Douma²,

Janssen³

et al. 2006

Biotechnol. Bioeng.

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The main bottleneck in scale-up of phototrophic fermentation is the low efficiency of light energy conversion to the desired product, which is caused by an excessive dissipation of light energy to heat. The photoheterotrophic formation of hydrogen from acetate and light energy by the microorganism Rhodobacter capsulatus NCIMB 11773 was chosen as a case study in this work. A light energy balance was set up, in which the total bacterial light energy absorption is split up and attributed to its destinations. These are biomass growth and maintenance, generation of hydrogen and photosynthetic heat dissipation. The constants defined in the light energy balance were determined experimentally using a flat-panel photobioreactor with a 3-cm optical path. An experimental method called D-stat was applied. Continuous cultures were kept in a so-called pseudo steady state, while the dilution rate was reduced slowly and smoothly. The biomass yield and maintenance coefficients of Rhodobacter capsulatus biomass on light energy were determined at 12.4 W/m(2) (400-950 nm) and amounted to 2.58 x 10(-8) +/- 0.04 x 10(-8) kg/J and 102 +/- 3.5 W/kg, respectively. The fraction of the absorbed light energy that was dissipated to heat at 473 W/m(2) depended on the biomass concentration in the reactor and varied between 0.80 and 0.88, as the biomass concentration was increased from 2.0 to 8.0 kg/m(3). The process conditions were estimated at which a 3.7% conversion efficiency of absorbed light energy to produced hydrogen energy should be attainable at 473 W/m(2).

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Influence of the degree and mode of light limitation on growth characteristics of the Rhodobacter capsulatus continuous cultures

Cited by 35 publications

References 18 publications

Hydrogen in metabolism of purple bacteria and prospects of practical application

Hydrogen in metabolism of purple bacteria and prospects of practical application

Controlling light‐use by Rhodobacter capsulatus continuous cultures in a flat‐panel photobioreactor

Controlling light-use byRhodobacter capsulatus continuous cultures in a flat-panel photobioreactor

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