Navigation Links
Ions, not particles, make silver toxic to bacteria
Date:7/11/2012

HOUSTON (July 11, 2012) Rice University researchers have settled a long-standing controversy over the mechanism by which silver nanoparticles, the most widely used nanomaterial in the world, kill bacteria.

Their work comes with a Nietzsche-esque warning: Use enough. If you don't kill them, you make them stronger.

Scientists have long known that silver ions, which flow from nanoparticles when oxidized, are deadly to bacteria. Silver nanoparticles are used just about everywhere, including in cosmetics, socks, food containers, detergents, sprays and a wide range of other products to stop the spread of germs.

But scientists have also suspected silver nanoparticles themselves may be toxic to bacteria, particularly the smallest of them at about 3 nanometers. Not so, according to the Rice team that reported its results this month in the American Chemical Society journal Nano Letters.

In fact, when the possibility of ionization is taken away from silver, the nanoparticles are practically benign in the presence of microbes, said Pedro Alvarez, George R. Brown Professor and chair of Rice's Civil and Environmental Engineering Department.

"You would be surprised how often people market things without a full mechanistic understanding of their function," said Alvarez, who studies the fate of nanoparticles in the environment and their potential toxicity, particularly to humans. "The prefix 'nano' can be a double-edged sword. It can help you sell a product, and in other cases it might elicit concerns about potential unintended consequences."

He said the straightforward answer to the decade-old question is that the insoluble silver nanoparticles do not kill cells by direct contact. But soluble ions, when activated via oxidation in the vicinity of bacteria, do the job nicely.

To figure that out, the researchers had to strip the particles of their powers. "Our original expectation was that the smalle
'/>"/>

Contact: Mike Williams
mikewilliams@rice.edu
713-348-6728
Rice University
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. To drive infections, a hijacking virus mimics a cells signaling system
2. Are silver nanoparticles harmful?
3. Silver nanoparticle synthesis using strawberry tree leaf
4. Effects of environmental toxicants reach down through generations
5. A toxic menu
6. Dip chip technology tests toxicity on the go
7. Using graphene, scientists develop a less toxic way to rust-proof steel
8. Boosting blood system protein complex protects against radiation toxicity
9. Lab-on-a-chip detects trace levels of toxic vapors in homes near Utah Air Force Base
10. Leading evolutionary scientist to discuss how genome of bacteria has evolved
11. Study by UC Santa Barbara researchers suggests that bacteria communicate by touch
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Ions, not particles, make silver toxic to bacteria
(Date:5/19/2015)... GOTHENBURG, Sweden , May 18, 2015 ... touch fingerprint sensors FPC1020, FPC1025, FPC1145, FPC1155 and FPC1035 from ... place from June until and including Q3 2015 and the ... Asia . Communicated order values for 2015 hereby amount ... revenues for Q1 2015 of 140 MSEK and a number ...
(Date:5/14/2015)... 2015  Verificient Technologies, Inc., a technology ... remote proctoring, announced a new alliance partnership ... creator of the Canvas Learning Management System ... will benefit from the seamless integration of ... a fully integrated multifactor biometrics behavioral application, ...
(Date:5/8/2015)... -- Synaptics Inc. (NASDAQ: SYNA ), the leading developer ... executive management team will present at the following investor events: ... Conference Date: May 18, 2015 Time: 10:40am ET ... Cowen and Company Technology, Media & Telecom ... New York Palace Hotel, New York, NY ...
Breaking Biology News(10 mins):Fingerprint Cards Receives Touch Fingerprint Sensor Order of SEK 230 Million and Raises Revenue Guidance for 2015 2Verificient and Instructure Announce Alliance Partnership to Provide Online Proctoring for K-12 and Higher Education Institutions 2Synaptics to Present at Upcoming Investor Conferences 2
... The ESA Governing Board has elected ten new ... a Fellow acknowledges outstanding contributions in one or more ... following Fellows will be recognized during Entomology 2011 -- ... November 13-16, 2011 in Reno, Nevada (see: http://www.entsoc.org/entomology2011 ...
... Iowa, July 6, 2011 Broadlawns Medical Center ... a part of Broadlawns, facilities modernization plan and commitment to ... Medical Center will be using palm scanners to register and ... unveiled to the public today at Broadlawns Medical Center as ...
... with infertility but also with significantly increased morbidity and mortality, ... that of people with type 2 diabetes or rheumatoid arthritis, ... Previous studies of POF, defined as the onset of menopause ... of women who seek hospital care, and therefore there is ...
Cached Biology News:Entomological Society of America names 2011 fellows 2Entomological Society of America names 2011 fellows 3Entomological Society of America names 2011 fellows 4Entomological Society of America names 2011 fellows 5Entomological Society of America names 2011 fellows 6Entomological Society of America names 2011 fellows 7Entomological Society of America names 2011 fellows 8Entomological Society of America names 2011 fellows 9Entomological Society of America names 2011 fellows 10Entomological Society of America names 2011 fellows 11Entomological Society of America names 2011 fellows 12Broadlawns Installs First-in-Iowa Biometric Patient Identity Security System 2Broadlawns Installs First-in-Iowa Biometric Patient Identity Security System 3Socioeconomic class and smoking linked to premature menopause 2
(Date:5/28/2015)... 28, 2015 Biscayne Pharmaceuticals, Inc ., ... its growth hormone-releasing hormone (GHRH) technology will be discussed in ... Annual Meeting. The data show that the family of ... blockers, is present on many primary breast cancer cells ... GHRH antagonists could have broad anti-cancer potential in breast ...
(Date:5/28/2015)... York and London (PRWEB) May 28, 2015 ... provider of Computer Aided Engineering software, announced today ... Research, Inc. (PSRI). CD-adapco will provide state-of-the-art engineering ... members will share their expertise and experiences in ... and refining industry members and advance the understanding ...
(Date:5/28/2015)... Californiaa (PRWEB) May 28, 2015 Glenn ... “ The Changing Landscape of EMR/EHR Clinical Data Integration ... Meeting taking place in Washington, DC on June 14th-18th. ... challenges of integrating EMR/EHR systems with EDC, and will ... opportunities brought by eSource and electronic health records/electronic medical ...
(Date:5/28/2015)... 28, 2015 Global futurist and ... to ask his audiences if they are ready ... robotics, solar cells, fuel cells, rapid health care ... battery storage technology, driverless cars, artificial intelligence masquerading ... inexpensive online education. , While the majority ...
Breaking Biology Technology:Data Presented At 2015 ASCO Annual Meeting Shows Biscayne Pharmaceuticals' GHRH Antagonist Target Is Expressed Across All Breast Cancer Subtypes 2Data Presented At 2015 ASCO Annual Meeting Shows Biscayne Pharmaceuticals' GHRH Antagonist Target Is Expressed Across All Breast Cancer Subtypes 3CD-adapco and PSRI Chartering New Course in Particle Flow Simulations 2Clinovo Presents at the DIA 2015 51st Annual Meeting in Washington, DC on June 14th-18th 2Futurist Jack Uldrich to Deliver 4 Keynote Addresses in June 2
... a manufacturer and marketer of identification solutions and precision ... the acquisition of Daewon Industry Corp., an agreement first ... South Korea, had fiscal 2005 sales of approximately $40 ... China. The company provides precision-cut adhesives, films, protective tapes, ...
... Milwaukee-area producer of brain imaging devices was looking for ... and it did not have to look far. , ... functional magnetic resonance imaging (fMRI) products and services, has ... Instrument Co. to promote its main product line, ...
... last weeks municipal wireless conference put on by SkyPilot Networks ... Pat Quinn made some good statements to rally municipal attendees. ... we are going to make a difference. , ,Quinn had ... competition and not allowing political or economic blockading. He has ...
Cached Biology Technology:Municipal broadband in Illinois: Where are the standards? 2Municipal broadband in Illinois: Where are the standards? 3Municipal broadband in Illinois: Where are the standards? 4
... rapid, convenient, and efficient native protein concentration ... a spin column to make handling easy. ... proteins which were electro-eluted in their native ... offering high binding capacity fo all pH ...
... analytical techniques, the AutoTrace SPE is a powerful, high-throughput workstation dedicated specifically for ... and elution steps for large volumes aqueous solution extractions (up to 2000ml's). ... ... ...
... Disposable. Virgin, optically clear polystyrene with ... alphanumeric coordinates for cell counting. 100% ... is a new product number, created ... If showing no availability yet, please ...
Cell Culture Flask, nontreated polystyrene...
Biology Products: