Navigation Links
ASU researchers synthesize molecule with self-control
Date:5/12/2008

TEMPE, Ariz. Plants have an ambivalent relationship with light. They need it to live, but too much light leads to the increased production of high-energy chemical intermediates that can injure or kill the plant.

The intermediates do this because the efficient conversion of sunlight into chemical energy cannot keep up with sunlight streaming into the plant.

The intermediates dont have anywhere to go because the system is jammed up down the line, says ASU chemist Devens Gust. Plants employ a sophisticated process to defend against damage.

To better understand this process, Gust, along with fellow ASU researchers Thomas Moore and Ana Moore, both professors of chemistry and biochemistry, designed a molecule that mimics what happens in nature. They report results with their molecule in the advanced online publication of Nature Nanotechnology (May 4, 2008).

In nature, plants defend against this sunlight overload process using non-photochemical quenching (NPQ). This process drains off the excess light excitation energy as heat so that it cannot generate the destructive high-energy species.

The ASU-designed molecule works in a similar fashion in that it converts absorbed light to electrochemical energy but reduces the efficiency of the conversion as light intensity increases. The ASU-designed molecule has several components including two light gathering antennas a porphyrin electron donor, a fullerene acceptor and a control unit that reversibly photoisomerizes between a dihydroindolizine (DHI) and a betaine (BT).

When white light (sunlight) shines on a solution of the molecules, light absorbed by the porphyrin (or by the antennas) is converted to electrochemical potential energy. When the white light intensity is increased, the DHI on some molecules change to a different molecular structure, BT, that drains light excitation energy out of the porphyrin and converts it to heat, avoiding the generation of excess
'/>"/>

Contact: Skip Derra
skip.derra@asu.edu
480-965-4823
Arizona State University
Source:Eurekalert

Page: 1 2

Related biology news :

1. Researchers identify proteins involved in new neurodegenerative syndrome
2. Texas researchers and educators head for Antarctica
3. MGH researchers describe new way to identify, evolve novel enzymes
4. University of Pennsylvania researchers develop formula to gauge risk of disease clusters
5. U of MN researchers discover noninvasive diagnostic tool for brain diseases
6. U of Minnesota researchers discover noninvasive diagnostic tool for brain diseases
7. Researchers discover new strategies for antibiotic resistance
8. Researchers find new taste in fruit flies: carbonated water
9. Binghamton University researchers investigate evolving malaria resistance
10. UIC researchers find promising new targets for antibiotics
11. Researchers develop simple method to create natural drug products
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... release is available in German . ... a method that uses the refraction of X-rays through ... images produced with this method are often of much ... in the team of Prof. Franz Pfeiffer are particularly ... and therapy including X-ray phase-contrast imaging. One main ...
(Date:7/11/2014)... relationships with other group members to reduce aggression and ... the strategy for grooming activities shows a certain pattern ... the scientific journal Biology Letters . , Grooming ... practiced without ulterior motives. To be groomed has hygienic ... grooming another individual can provide access to infants, mating ...
(Date:7/11/2014)... mesenchymal stem cells can stimulate neurogenesis in the brain ... (AD) and improve tissue and function injury under the ... the therapeutic effect of adipose-derived stem cells (ADSCs) transplantation ... oxidative injury and neurogenesis in the brain of AD ... Life Sciences, Tsinghua University, China transplanted ADSCs into the ...
Breaking Biology News(10 mins):New simple setup for X-ray phase contrast 2Baboons groom early in the day to get benefits later 2
... good grade, or promotion wonderfully concentrates the mind, ... responsible for such reward-motivated learning. , In an ... Adcock and colleagues report brain-scanning studies in humans ... the brain's learning and memory regions to promote ...
... by the University of California, Berkeley, and Lawrence Berkeley National ... cells that can be flipped on and off as easily ... like these could trigger a chemical reaction, initiate a muscle ... all at the flash of a light. , One ...
... molecular denominator in aging and many age-related diseases is oxidative ... HMS associate professor of pathology. The skin of a bitten ... in some ways that is a good metaphor for the ... types of cells over time. , Humans and other organisms ...
Cached Biology News:The brain's motivation station 2Light-sensitive photoswitches could restore sight to those with macular degeneration 2Light-sensitive photoswitches could restore sight to those with macular degeneration 3Free radical cell death switch identified 2
(Date:7/10/2014)... D.C., April 15, 2014 -- According to the ... to nuclear security comes from terrorists acquiring sufficient ... to construct a crude nuclear explosive device. The ... nuclear trafficking have involved gram-level quantities, which can ... , According to a new study appearing this ...
(Date:7/10/2014)... WASHINGTON D.C., June 17, 2014 Using microscopic ... of specific gases, researchers at MIT,s Quantum Photonics ... detection levels in the parts-per-billion range. Optical sensors ... to their high signal-to-noise ratio, compact, lightweight nature, ... optical gas sensors had been developed before, the ...
(Date:7/10/2014)... of psychiatric disorders has been extremely challenging because there ... are insufficient to cause disease. Now investigators reporting in ... Cell Stem Cell describe a strategy that ... with other risk factors or environmental exposures to affect ... a genetic variant that may predispose individuals to schizophrenia. ...
(Date:7/10/2014)... batteries that power our laptops and electric vehicles could ... charge with the help of a sponge-like silicon material. ... the graphite traditionally used in one of the battery,s ... energy storage capacity of graphite. A paper describing the ... today in Nature Communications . , "Silicon has ...
Breaking Biology Technology:Sensitive detection method may help impede illicit nuclear trafficking 2Swell new sensors 2New strategy could uncover genes at the root of psychiatric illnesses 2Silicon sponge improves lithium-ion battery performance 2Silicon sponge improves lithium-ion battery performance 3
... Inc. (Nasdaq:,NVAX) Novavax today announced Chief Executive Officer Dr. ... Conference at,5:05 am Eastern time (11:05 am CEST) on ... the company announced today., Dr. Singhvi will provide ... and its unique manufacturing solution. A,link to an audio ...
... Pharmaceuticals,Corp. (Nasdaq: MEMY ) today reported its ... 2008., "We had a productive start to ... our operations to advance four high-value,programs," said Vaughn ... decision to license R3487/MEM 3454 highlights the potential,of ...
... CALGARY, May 14 /PRNewswire-FirstCall/ - Oncolytics Biotech ... it has,received a letter of approval from ... (MHRA) for its Clinical Trial Application (CTA),to ... intravenous administration of,REOLYSIN(R) in combination with paclitaxel ...
Cached Biology Technology:Memory Pharmaceuticals Reports First Quarter 2008 Financial Results 2Memory Pharmaceuticals Reports First Quarter 2008 Financial Results 3Memory Pharmaceuticals Reports First Quarter 2008 Financial Results 4Memory Pharmaceuticals Reports First Quarter 2008 Financial Results 5Memory Pharmaceuticals Reports First Quarter 2008 Financial Results 6Memory Pharmaceuticals Reports First Quarter 2008 Financial Results 7Oncolytics Biotech Inc. Announces U.K. Phase II Clinical Trial Investigating REOLYSIN(R) in Combination with Paclitaxel and Carboplatin 2
... SizeSep 400 Spun Columns, 10. *SizeSep 400 ... > 400 base pairs in length. ... CL-4B and pre-equilibrated in distilled water containing 0.15% ... than ~ 400 base pairs. *Extremely ...
... 25 purifications. Allows rapid purification ... removal of unincorporated CyDye label and ... yields of labeled cDNA probe. ... labeled by either direct incorporation or ...
... are complete ready-to-use reagents for the isolation ... specifically formulated for the isolation of genomic ... specifically formulated for the isolation of genomic ... DNAzol Reagents can be used for restriction ...
Apoptosis Detection Systems and Reagents...
Biology Products: