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:7/24/2014)... Scientists at The New York Stem Cell Foundation ... creating a viable cell replacement therapy for multiple ... For the first time, NYSCF scientists generated induced ... of patients with primary progressive multiple sclerosis and ... these stem cells into becoming oligodendrocytes, the myelin-forming ...
(Date:7/24/2014)... Citing many sobering examples of how wildlife loss leads ... article co-authored by Wildlife Conservation Society (WCS) Health ... Christopher Golden, calls for an interdisciplinary approach to tackle ... directly supports about 15% of the world,s people and ... world,s poor. It should come as no surprise that ...
(Date:7/24/2014)... New York, NY - July 24, 2014 -- Keryx ... results from the long-term, randomized, active control Phase 3 ... ferric iron-based phosphate binder, for the treatment of hyperphosphatemia ... The PERFECTED study (PhosphatE binding and iRon delivery with ... the Journal of the American Society of Nephrology ...
Breaking Biology News(10 mins):NYSCF scientists one step closer to cell therapy for multiple sclerosis patients 2New study draws links between wildlife loss and social conflicts 2Zerenex™ (ferric citrate) long-term Phase 3 study results published in JASN 2Zerenex™ (ferric citrate) long-term Phase 3 study results published in JASN 3Zerenex™ (ferric citrate) long-term Phase 3 study results published in JASN 4
... influenza caused widespread death and illness in 1918, 1957, 1968 ... time of these pandemics finds that each of them was ... study,s authors--Jeffrey Shaman of Columbia University,s Mailman School of Public ... Healthnote that the La Nia pattern is known to alter ...
... new varieties of corn with a higher yield faster than ... Germany, and other institutions are relying on a trick: early ... chemical and genetic makeup, as well as on new statistical ... authoritative journal Nature Genetics on Sunday evening, Jan. ...
... proteins have characteristic ways of "walking," which (also like human ... have discovered the unique "drunken sailor" gait of dynein, a ... in the body and whose malfunction has been associated with ... The research, which was led by Samara Reck-Peterson ...
Cached Biology News:Does the La Niña weather pattern lead to flu pandemics? 2Good parents are predictable -- at least when it comes to corn 2Good parents are predictable -- at least when it comes to corn 3Good parents are predictable -- at least when it comes to corn 4Walk this way: Scientists and MBL physiology students describe how a motor protein 'steps out' 2
(Date:7/25/2014)... At the request of the AMA, the ... for the public comment period (Docket No. FAA-2014-0396) for ... established by Congress as part of the FAA Modernization ... the new deadline for comments as September 23, 2014. ... published in the Federal Register on July 25, 2014, ...
(Date:7/25/2014)... , July 25, 2014 Sinovac Biotech Ltd. ... products in China , today announced that ... quarter ended June 30, 2014, after market close on Thursday, ... call prior to the market opening on Friday, August 15, ... 8:00 p.m. China Standard Time) to review the Company,s financial ...
(Date:7/24/2014)... July 24, 2014 -- Keryx Biopharmaceuticals, Inc. (Nasdaq:KERX) (the ... randomized, active control Phase 3 study of Zerenex (ferric ... for the treatment of hyperphosphatemia in patients with end-stage ... binding and iRon delivery with FErric CiTrate in EsrD) ... the American Society of Nephrology ( JASN ). ...
(Date:7/24/2014)... RIDGE, Tenn., July 24, 2014 -- A novel combination ... the Department of Energy,s Oak Ridge National Laboratory an ... for its unusual physical and electrochemical properties. , ... how oxygen affects the surface of a perovskite manganite, ... behavior. The new avenue to understand surface behavior could ...
Breaking Biology Technology:FAA Grants Comment Extension at the Request of AMA 2Sinovac to Host Conference Call to Report Second Quarter 2014 Unaudited Financial Results 2Zerenex (ferric citrate) long-term Phase 3 study results published in JASN 2Zerenex (ferric citrate) long-term Phase 3 study results published in JASN 3Zerenex (ferric citrate) long-term Phase 3 study results published in JASN 4ORNL study reveals new characteristics of complex oxide surfaces 2
... - Company to Host Conference Call at 4:30 p.m. ET ... PCYC ) today reported financial results for its fourth ... for the fourth quarter of,fiscal 2008 was $4.6 million, or ... or $0.27 per share, for the fourth quarter of fiscal ...
... is accelerating improvements for converting plant biomass into biofuelas ... needs, reports Eddy Rubin, Director of the U.S. Department ... August 14 edition of the journal Nature . ... a path forward for how emerging genomic technologies will ...
... SGX Pharmaceuticals, Inc.,(Nasdaq: SGXP ) today announced that ... leading proxy advisory firms, have,recommended that SGX stockholders vote ... LLY ) at the SGX Special Stockholders Meeting,scheduled ... The Board of Directors of SGX unanimously recommends ...
Cached Biology Technology:Pharmacyclics Reports Fourth Quarter and Fiscal 2008 Financial Results 2Pharmacyclics Reports Fourth Quarter and Fiscal 2008 Financial Results 3Pharmacyclics Reports Fourth Quarter and Fiscal 2008 Financial Results 4Pharmacyclics Reports Fourth Quarter and Fiscal 2008 Financial Results 5Pharmacyclics Reports Fourth Quarter and Fiscal 2008 Financial Results 6DOE JGI Director Eddy Rubin highlights the genomics of plant-based biofuels in the journal Nature 2DOE JGI Director Eddy Rubin highlights the genomics of plant-based biofuels in the journal Nature 3DOE JGI Director Eddy Rubin highlights the genomics of plant-based biofuels in the journal Nature 4SGX - Lilly Merger Offer Receives Positive Opinions From Proxy Advisory Firms 2SGX - Lilly Merger Offer Receives Positive Opinions From Proxy Advisory Firms 3SGX - Lilly Merger Offer Receives Positive Opinions From Proxy Advisory Firms 4
... the principal excitatory neurotransmitter receptors ... glutamate receptors exist: Ionotropic receptors, ... receptors are oligomeric complexes of ... which comprise ligand-gated calcium channels. ...
Recommended fro Western blotting application...
... KLF15 is a Cys2-His2 zinc finger gene. ... liver, kidneys, heart, and skeletal muscle. ... produced in rabbits immunized with a synthetic ... KLF15 with an internal ID of P03590 ...
... Sac-Cel (Second Antibody Coated CELlulose) was developed ... of Dartford, Kent, one of the earliest ... IDS acquired the product range in 1987. ... clinical biochemists developing their own "in house" ...
Biology Products: