Navigation Links
Blocking carbon dioxide fixation in bacteria increases biofuel production
Date:3/30/2011

Reducing the ability of certain bacteria to fix carbon dioxide can greatly increase their production of hydrogen gas that can be used as a biofuel. Researchers from the University of Washington, Seattle, report their findings in the current issue of online journal mBio.

"Hydrogen gas is a promising transportation fuel that can be used in hydrogen fuel cells to generate an electric current with water as the only waste product," says Caroline Harwood, who conducted the study with James McKinlay. "Phototrophic bacteria, like Rhodopseudomonas palustris obtain energy from light and carbon from organic compounds during anaerobic growth. Cells can naturally produce hydrogen gas biofuel as a way of disposing of excess electrons."

Feeding these bacteria more electron rich organic compounds though, does not always produce the logically expected result of increased hydrogen production. Harwood and McKinlay analyzed metabolic functions of R. palustris grown on four different compounds to better understand what other variables might be involved.

One factor involved appears to be the Calvin cycle, a series of biochemical reactions responsible for the process known as carbon dioxide fixation. The Calvin cycle converts carbon dioxide and electrons into organic compounds. Therefore carbon dioxide-fixation and hydrogen production naturally compete for electrons.

When they tested a strain of the bacterium, which had been genetically modified to block carbon dioxide-fixation they observed an increased output of hydrogen from all four substrates.

The Calvin cycle was not the only variable affecting hydrogen production that Harwood and McKinlay identified in the paper. They also determined that the metabolic route a growth substrate took on its way to becoming a building block for making new cells also played a role.

"Our work illustrates how an understanding of bacterial metabolism and physiology can be applied to engineer microbes for the production of sustainable biofuels," says Harwood.


'/>"/>

Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
Source:Eurekalert

Related biology technology :

1. New Radiation-Blocking Medical Garments Introduced at RSNA Meeting in Chicago : Demron-M Technology Provides Total Protection in a Lightweight, Durable, Flexible Fabric
2. Ultra fast photodetectors out of carbon nanotubes
3. Taming carbon nanotubes
4. Touchscreens made of carbon
5. Curved carbon for electronics of the future
6. Carbon-Based Nano-Materials and Devices Conference
7. Earthshaking possibilities may limit underground storage of carbon dioxide
8. Energy technologies not enough to sufficiently reduce carbon emissions, NYUs Hoffert concludes
9. Scientists observe single ions moving through tiny carbon-nanotube channel
10. Extreme darkness: Carbon nanotube forest covers NISTs ultra-dark detector
11. Using carbon nanotubes in lithium batteries can dramatically improve energy capacity
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/24/2017)... Franklin, MA, USA & Geneva, Switerland (PRWEB) , ... ... ... are pleased to announce the first commercially available malaria Plasmodium falciparum culture panels ... Malaria P. falciparum culture panels, which are available in a range of concentrations ...
(Date:1/24/2017)... ... January 23, 2017 , ... ... is the first-ever recipient of the National Academy of Sciences Prize in Food ... security and nutrition. , The annual National Academy of Sciences (NAS) Prize in ...
(Date:1/24/2017)... , Jan. 23, 2017   Instrument Business Outlook ... Minneapolis, MN ) the 2016 Company ... most authoritative newsletter tracking developments in the analytical ... "Bio-Techne consistently achieved outstanding technical, operational and ... Managing Editor of IBO. "In 2016, Bio-Techne capitalized ...
(Date:1/23/2017)... -- Spherix Incorporated (Nasdaq: SPEX ) an intellectual ... and monetization of intellectual property, today provided an update ... Anthony Hayes , Chief Executive Officer of Spherix, stated, ... with shareholders about the status of existing monetization efforts ... patent assets that fit with our current holdings.  We ...
Breaking Biology Technology:
(Date:1/18/2017)... , Jan. 18, 2017 MedNet ... that supports the entire spectrum of clinical research, ... another record-breaking year for the organization in terms ... in MedNet,s eClinical products and services. The company,s ... marketplace success of iMedNet ...
(Date:1/11/2017)... , Jan. 11, 2017 Intoxalock, a leading ... the release of its patent-pending calibration device. With this ... perform calibrations, securely upload data logs and process repairs ... customer. "Fighting drunk driving through the application ... public at large, but also for the customer who ...
(Date:1/4/2017)...  For the thousands of attendees at this year,s International Consumer Electronics ... and biometric measurement devices and services, will be featuring its new line ... A&D Medical,s special CES Exhibit Suite , the new upper arm ... company,s WellnessConnected product platform.  ... ...
Breaking Biology News(10 mins):