Photosynthetic production of the filamentous cyanobacteriumSpirulina platensis in a cone-shaped helical tubular photobioreactor

1996 ◽  
Vol 44 (6) ◽  
pp. 693-698 ◽  
Author(s):  
Y. Watanabe ◽  
D. O. Hall
Keyword(s):  
Tubular Photobioreactor ◽  
Photosynthetic Production

scholarly journals Over-expression of an electron transport protein OmcS provides sufficient NADH for d-lactate production in cyanobacterium

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Hengkai Meng ◽  
Wei Zhang ◽  
Huawei Zhu ◽  
Fan Yang ◽  
Yanping Zhang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Electron Transport ◽  
Lactate Production ◽  
Transport Protein ◽  
Dominant Form ◽  
Photosynthetic Production ◽  
Reducing Equivalent ◽  
Excess Electrons ◽  
Novel Strategy ◽  
Electron Transport Protein

Abstract Background An efficient supply of reducing equivalent is essential for chemicals production by engineered microbes. In phototrophic microbes, the NADPH generated from photosynthesis is the dominant form of reducing equivalent. However, most dehydrogenases prefer to utilize NADH as a cofactor. Thus, sufficient NADH supply is crucial to produce dehydrogenase-derived chemicals in cyanobacteria. Photosynthetic electron is the sole energy source and excess electrons are wasted in the light reactions of photosynthesis. Results Here we propose a novel strategy to direct the electrons to generate more ATP from light reactions to provide sufficient NADH for lactate production. To this end, we introduced an electron transport protein-encoding gene omcS into cyanobacterium Synechococcus elongatus UTEX 2973 and demonstrated that the introduced OmcS directs excess electrons from plastoquinone (PQ) to photosystem I (PSI) to stimulate cyclic electron transfer (CET). As a result, an approximately 30% increased intracellular ATP, 60% increased intracellular NADH concentrations and up to 60% increased biomass production with fourfold increased d-lactate production were achieved. Comparative transcriptome analysis showed upregulation of proteins involved in linear electron transfer (LET), CET, and downregulation of proteins involved in respiratory electron transfer (RET), giving hints to understand the increased levels of ATP and NADH. Conclusions This strategy provides a novel orthologous way to improve photosynthesis via enhancing CET and supply sufficient NADH for the photosynthetic production of chemicals.

Biological elimination of nitric oxide and carbon dioxide from flue gas by marine microalga NOA-113 cultivated in a long tubular photobioreactor

1996 ◽  
Vol 82 (4) ◽  
pp. 351-354 ◽  
Author(s):  
Ken-Ichi Yoshihara ◽  
Hiroyasu Nagase ◽  
Kaoru Eguchi ◽  
Kazumasa Hirata ◽  
Kazuhisa Miyamoto
Keyword(s):  
Nitric Oxide ◽  
Carbon Dioxide ◽  
Flue Gas ◽  
Tubular Photobioreactor ◽  
Marine Microalga

Photosynthetic Production of Ulva rotundata Bliding Estimated by Oxygen and Inorganic Carbon Exchange Measurements in the Field

2003 ◽  
Vol 46 (4) ◽  
Author(s):  
J. M. Mercado ◽  
A. Avilés ◽  
E. Benítez ◽  
M. Carrasco ◽  
L. Palomo ◽  
...  
Keyword(s):  
Inorganic Carbon ◽  
Carbon Exchange ◽  
Photosynthetic Production

scholarly journals Twisted tubular photobioreactor fluid dynamics evaluation for energy consumption minimization

2017 ◽  
Vol 27 ◽  
pp. 65-72 ◽  
Author(s):  
C.A. Gómez-Pérez ◽  
J.J. Espinosa Oviedo ◽  
L.C. Montenegro Ruiz ◽  
A.J.B. van Boxtel
Keyword(s):  
Fluid Dynamics ◽  
Energy Consumption ◽  
Tubular Photobioreactor

scholarly journals Green technologies for air pollution treatment by microalgae in tubular photobioreactor

2021 ◽  
Vol 926 (1) ◽  
pp. 012098
Author(s):  
T T Minh ◽  
N H Tien ◽  
L V Giang ◽  
H H Loc ◽  
V T D Hien ◽  
...  
Keyword(s):  
Air Pollution ◽  
Biomass Concentration ◽  
Absorption Efficiency ◽  
Green Technologies ◽  
Tubular Photobioreactor ◽  
Technology System ◽  
Study Approach ◽  
Bicarbonate Ions ◽  
Stable Growth ◽  
The Impact

Abstract Air pollution in general and motorcycle exhaust, in particular, is a big problem attracting a lot of attention from people and researchers worldwide because of the significant impacts it has on humans and the environment. The issue of air pollution is growing, and the impact is more evident than ever. Carbon dioxide represents a series of problems that we face daily but have not yet been effectively solved. Currently, microalgae are known to photosynthesize and use free CO2, bicarbonate ions as a source of nutrients to grow. Microalgae are developed under appropriate environmental conditions, which will bring admirable CO2 treatment efficiency and obtain biomass for other applications. The study approach was an inexpensive and natural air purification solution by microalgae, which is designed as a tubular photobioreactor. The study was conducted by evaluating the ability of Chlorella Vulgaris to grow and absorb CO2 emissions in the newly established system with exhaust gas supplied from a mini motorcycle engine. The results showed that microalgae grew stably in the tubular photobioreactor system with a biomass concentration of 6×106 cells/ml after 42 days of the experiment. Simultaneously with the stable growth of microalgae, the CO2 emission concentration was reduced with 26.59% absorption efficiency after 11 days of the experiment. Finally, establishing the tubular photobioreactor technology system has yielded impressive initial results in cultivating stable growing microalgae combined with CO2 emission treatment.

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