Navigation Links
A nano-sized sponge made of electrons
Date:11/12/2013

lised in one of the atoms at the surface. To determine the behaviour of the electrons during the reaction, the scientists used the intense X-ray beams at the ESRF to probe solutions of nanoparticles in water and ethanol. The nanoparticles had a diameter of 3 nm and consisted of several thousands of molecules of cerium dioxide.

It is known that nanoparticles can change their behaviour under vacuum when studied with an electron microscope, for example. The scientists therefore carried out their experiment under realistic conditions, studying the nanoparticles in solution and in real time as the chemical reaction was taking place. "It was only possible to conduct these experiments in a liquid rather than under vacuum because we used X-rays as probes for the electron distribution." says Jean Daniel Cafun.

In their experiment, the scientists were successful in observing the creation of the nanoparticles in solution and then how these nanoparticles eliminated highly reactive molecules (reactive oxygen species, or ROS) from the solution. This elimination process mimics the role of an important enzyme in living organisms - catalase - that protects cells from these aggressive molecules. Cancer patients undergoing radiation therapy have high levels of ROS in their bodies and ceria nanoparticles have been proposed as a way of reducing the levels of ROS and thus alleviating the negative impacts of the therapy on the patients. Throughout the chemical reaction, the electronic structure of the cerium atoms and thus the redistribution of the electron cloud was monitored. "It is crucial to be able to study the chemical processes of the particles in an environment that is close to conditions found in biological systems." emphasizes Victor Puntes.

"Scientists have been discussing the question: What happens when electrons are added to ceria nanoparticles? The work by Cafun et al. is a key study because it questions the present, widely accepted model and will
'/>"/>

Contact: Claus Habfast
claus.habfast@esrf.fr
33-666-662-384
European Synchrotron Radiation Facility
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. Living cells behave like fluid-filled sponges
2. Global Laparotomy Sponge Market 2011-2015: MarketResearchReports.Biz
3. Penn metamaterials experts show a way to reduce electrons effective mass to nearly 0
4. A nanoscale landscape controls flow of surface electrons on a topological insulator
5. Reluctant electrons enable extraordinarily strong negative refraction
6. New technique uses electrons to map nanoparticle atomic structures
7. Molecular graphene heralds new era of designer electrons
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
A nano-sized sponge made of electrons
(Date:9/17/2014)... , Sept. 17, 2014  PDL BioPharma, Inc. (PDL) (NASDAQ: ... registered accounting firm, Ernst & Young LLP ("EY") that it ... in a letter delivered to the Company on September 15, ... 16, 2014.  PDL has issued the following ... received a number of inquiries on the reason for the ...
(Date:9/17/2014)... 17, 2014 A long-term retrospective study ... irradiation (APBI) via interstitial brachytherapy suggests that women ... nodes could be suitable to receive the treatment. ... place these patients in the "unsuitable" category for ... ASTRO meeting, Beaumont Health System,s Peter Y. ...
(Date:9/17/2014)... 17, 2014 The global consumption of squalene / ... is a natural skin-identical chemical that finds applications in various ... supplements, pharmaceuticals, and in other applications like high grade lubrication, ... a few major players and is regionally segregated. Sophim ( ... Oil Co. Ltd. ( Japan ), SeaDragon Marine ...
(Date:9/17/2014)... , Sept. 17, 2014 /PRNewswire/ - Oncothyreon Inc. ... intends to offer and sell shares of its Common ... but concurrent underwritten public offerings.  The Series A Convertible ... Oncothyreon Common Stock, provided that conversion will be prohibited ... would beneficially own more than 4.99% of the Common ...
Breaking Biology Technology:PDL BioPharma Issues Statement on Resignation of Ernst and Young as Corporate Auditors 2PDL BioPharma Issues Statement on Resignation of Ernst and Young as Corporate Auditors 3Partial Breast Irradiation With Interstitial Brachytherapy Appears Appropriate For Women Previously Considered Unsuitable 2Partial Breast Irradiation With Interstitial Brachytherapy Appears Appropriate For Women Previously Considered Unsuitable 3Partial Breast Irradiation With Interstitial Brachytherapy Appears Appropriate For Women Previously Considered Unsuitable 4Squalene 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 3Oncothyreon Announces Proposed Public Offerings 2
... made the honor roll of a national economic development assessment ... , ,The 2006 Development Report Card for the States, released ... the state an A in performance and Bs in business ... there were a few stinkers hidden in the subcategories that ...
... Lori Holder-Webb , an assistant professor of accounting and ... Business, is part of a four-person research team recently ... NASD Investor Education Foundation recently awarded more ... both of the School of Management of Boston College, ...
... Visonex will receive $109,000 in loans ... office said. The company provides web-based disease management software for ... to hire nine people as part of its current growth ... money includes: , , $100,000 loan from the Technology ...
Cached Biology Technology:
(Date:9/17/2014)... health care to reproductive technologies, the justice and ... of people to identify key issues, articulate their ... find the most defensible ways forward. But what ... societal conversations?, The Hastings Center and the Presidential ... teamed up to publish a series of essays ...
(Date:9/17/2014)... of the Santa Ana Wildfire Threat Index a ... the powerful, hot, dry Santa Ana wind, which can ... introduced Sept. 17 by the U.S. Forest Service, in ... , The index includes four classification levels ranging from ... fire agencies and other emergency responders, the media and ...
(Date:9/17/2014)... the Arts and Humanities has received a $260,000 grant ... project, "The Boundaries of the Human in the Age ... a wide-ranging series of events aimed at exploring two ... artists and researchers who are exploring the boundaries of ... humanism, and the other involves the increasingly influential hypothesis ...
Breaking Biology News(10 mins):Why bioethics literacy matters 2Why bioethics literacy matters 3UCLA scientists play key role in developing new Santa Ana Wildfire Threat Index 2Mellon Foundation awards grant for major project in the humanities and sciences 2
... of life imitating art, avian scents given off by male ... Michigan State University researcher revealed the process of how males ... issue of Behavioral Ecology . Scents are used in ... evaluating mates. But this is the first study of its ...
... dopamine is best known for its roles in the ... reward, learning and memory. Now, Vanderbilt University Medical Center ... in the kidneys is important for renal ... published in the July Journal of Clinical Investigation ...
... July 19, 2011 -- How is it that a disc-like ... into an elongated embryo? This mechanism is a mystery ... The first significant step towards understanding the issue was made ... embryologists Hans Spemann and Hilde Mangold. The two used early ...
Cached Biology News:Avian 'Axe effect' attracts attention of females and males 2Kidney dopamine regulates blood pressure, life span 2Hebrew U. scientists show for first time how early human embryo acquires its shape 2
Mouse monoclonal antibody raised against a partial recombinant PRG4. NCBI Entrez Gene ID = PRG4...
Mouse monoclonal antibody raised against a partial recombinant SCARB2. NCBI Entrez Gene ID = SCARB2...
...
Mouse polyclonal antibody raised against a partial recombinant CSRP3. NCBI Entrez Gene ID = 8048...
Biology Products: