Navigation Links
Help from the dark side
Date:8/8/2010

fter excitation. The negative peak that appeared in the spectrum was evidence that the return to ground state took place without radia-tion, through a so-called "dark channel".

This happens because interactions between molecules in the sample and in the solvent produce common orbitals. The excited electrons are pushed into these orbitals. "This works because the molecular orbitals of the iron and water ions come very close spatially and their energies match very well," explains Emad Aziz, head of a junior research group at HZB. The electrons remain in this new state longer than they would in a normal molecular orbital. Their energy state therefore prevents the emission of the normally expected fluorescent light.

Dips in the spectrum thus give a clue as to the kind of interplay between the sample and the solvent. One could use this process to examine how much the solvent contributes towards the function of biochemical systems such as pro-teins, for example.

Ultrafast processes such as charge transfer have only been observable with enormous effort using conventional methods. Now, HZB researchers have found a way to explain the dynamics of this process using a simple model. "We can observe where the charges migrate to, and we can see that this happens within a few femtoseconds," Emad Aziz stresses. The result also has major repercus-sions for the interpretation of X-ray absorption spectra in general.

For their experiments, the group used a specially developed flow cell that also allows them to study biological samples by X-ray in their natural environment that is in dissolved form.


'/>"/>

Contact: Dr. Emad Flear Aziz Bekhit
emad.aziz@helmholtz-berlin.de
49-308-062-15003
Helmholtz Association of German Research Centres
Source:Eurekalert

Page: 1 2

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/17/2014)... EC-FP5 four-year project, delivering its first release in 2004. ... in several EC projects, as a part of the ... BON), to increase the general awareness of the work ... dissemination of the Fauna Europaea results, the ... e-Publishing tools to prepare data papers for all 56 ...
(Date:9/17/2014)... Copenhagen Centre for Social Evolution and Yale University offers ... weight and -length can partially predict the likelihood of ... and schizophrenia later in life. The study analyzed medical ... diagnoses for up to 30 years, and adjusted for ... published today in the Proceedings of the Royal ...
(Date:9/17/2014)... EAST LANSING, Mich. Mutations in the human retinoblastoma ... Now, Michigan State University scientists have turned to fruit ... cancer gene. , In a paper featured on ... Journal of Biological Chemistry , Michigan State University researchers ... mutations similar to those present in the human cancer ...
Breaking Biology News(10 mins):Contributions on Fauna Europaea: Data papers as innovative model on expert involvement 2Size at birth affects risk of adolescent mental health disorders 2Size at birth affects risk of adolescent mental health disorders 3Abnormal properties of cancer protein revealed in fly eyes 2
... , This news release is available in ... diseases like Parkinson,s disease involve the death of thousands of neurons ... as GDNF, promote the survival of the neurons; however, clinical tests ... the Max Planck Institute of Neurobiology in Martinsried and their colleagues ...
... year around 11 million people suffer severe burns. The resulting ... results in lifelong scars. What is needed to reduce this ... Only a very limited area of skin can be removed ... new wounds. Besides conventional skin grafting, another option is to ...
... synthetic biology will be established in Bristol, Nottingham ... from the Biotechnology and Biological Sciences Research Council ... Council (EPSRC). The 40M+ investment will be ... David Willetts tonight at a BBSRC event in ...
Cached Biology News:Parkinson gene: Nerve growth factor halts mitochondrial degeneration 2Parkinson gene: Nerve growth factor halts mitochondrial degeneration 3Blood and lymphatic capillaries grown for the first time in the lab 2UK establishes 3 new synthetic biology research centers 2
(Date:9/18/2014)... Pipette.com announces brand new ... and AccuPet brand of pipettes. Micropipettes are ideal ... less and are a great tool for molecular ... The micropipette promotions were designed to offer a ... to help customers find the right solution. Brands ...
(Date:9/17/2014)... Sept. 17, 2014 The global consumption of squalene ... Squalene is a natural skin-identical chemical that finds applications in ... food supplements, pharmaceuticals, and in other applications like high grade ... has a few major players and is regionally segregated. Sophim ... Liver Oil Co. Ltd. ( Japan ), SeaDragon ...
(Date:9/17/2014)... -- MiMedx Group, Inc. (NASDAQ: MDXG ), ... protected regenerative biomaterials and bioimplants processed from human ... clinical study.    The study article, ... Trial Evaluating the Use of Dehydrated ... Therapy vs. Multi-layer Compression Therapy Alone in the ...
(Date:9/17/2014)... Terracon Corporation has announced the introduction of a ... This addition to the company’s industry-leading line of custom ... available in 125 or 250 gallon capacities. It ... or less. , The new pre-engineered TerraPure tank offers ... TerraPure tank line – plus quick turnaround. An ...
Breaking Biology Technology:Major Pipette Distributor Pipette.com Announces Promotions on Sartorius/Biohit, Socorex, Capp, and AccuPet Micropipettes 2Major Pipette Distributor Pipette.com Announces Promotions on Sartorius/Biohit, Socorex, Capp, and AccuPet Micropipettes 3Squalene Market by Source (Animal & Vegetable) & by End-user Industry (Cosmetics, Pharmaceuticals & Food Industry) - Global Trends & Forecasts to 2019 2Squalene Market by Source (Animal & Vegetable) & by End-user Industry (Cosmetics, Pharmaceuticals & Food Industry) - Global Trends & Forecasts to 2019 3MiMedx Multi-Center Randomized, Controlled VLU Clinical Study Published In Peer-Reviewed Journal 2MiMedx Multi-Center Randomized, Controlled VLU Clinical Study Published In Peer-Reviewed Journal 3MiMedx Multi-Center Randomized, Controlled VLU Clinical Study Published In Peer-Reviewed Journal 4Terracon Introduces Pre-Engineered TerraPure® Tank for Ultrapure Water Applications 2
... an effort to spur entrepreneurship in a broader range ... has named the University of Wisconsin-Madison as ... has received $5 million to help train students in ... in 2004 to bring entrepreneurship education to a wider ...
... to provide end-to-end approach to retail workforce optimization ... and the Denver-based StorePerform Technologies, Inc. , ,The ... in the next 20 to 30 days. Financial terms were ... part of RedPrairie's retail productivity division, previously known as ...
... this is my last article of the year, and I have ... my New Year's resolution for this column is bring back more ... is that I simply have not gone to as many concerts ... will need to remedy!) , ,Looking over 2006, my focus has ...
Cached Biology Technology:UW gets $5M to extend entrepreneurship 22006: A great biotech financing year, unless you were going public! 22006: A great biotech financing year, unless you were going public! 32006: A great biotech financing year, unless you were going public! 42006: A great biotech financing year, unless you were going public! 5
... products ATP-Free using Mo Bio luciferase assay. Mo ... service that will allow you to certify your ... and enable you to deliver them to your ... ATP detection limit is 3.5 x 10-12 /l, ...
... in Microarrays: Biomedical Photometrics Inc. (Waterloo, Ontario, ... Germany) have collaborated to develop a fluorescence ... The DNAscope AT is based on ... AT automatically reads up to six ArrayTubes ...
... provides a comprehensive kinase analysis service ... (PKS) peptide microarrays synthesized on Paraflo ... profiling, quantitative measurement of kinase kinetic ... comprehensive service includes preparation of your ...
... The JNK (c-Jun NH2-terminal kinase) signal ... identified MAP kinase pathways in mammals. ... to environmental stress, is associated with ... and is implicated in the immune ...
Biology Products: