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:4/27/2015)... 2015  For more than four decades, AUVSI,s ... the premier worldwide event for the unmanned land, sea, ... event for any local, national, or trade news organization ... markets and current applications of unmanned technologies. The conference ... $48 billion industry, and how it will soon impact ...
(Date:4/27/2015)... Conn. , Apr. 27, 2015 NXT-ID, ... a biometric authentication company focused on the growing mobile ... commence shipping to pre-order customers the first week of ... through the month of May. ... a significant milestone for the company as Wocket® enters ...
(Date:4/27/2015)... Apr. 27, 2015 Profile Solutions, Inc. (OTC: ... security systems is pleased to announce that Dr ... consultant and member of its scientific advisory board. ... as a thought leader in technology-enhanced learning models. He ... and has published studies and books focused on online ...
Breaking Biology News(10 mins):UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 2UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 3UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 4UNMANNED SYSTEMS 2015: Largest International Conference and Trade Show for the Drone and Unmanned Technology Industry 5Wocket, the Smartest Wallet You Will Ever Own, Announces Shipment to Pre-order Customers 2Wocket, the Smartest Wallet You Will Ever Own, Announces Shipment to Pre-order Customers 3Profile Solutions Names Medicinal Cannabis, Agriculture and Technology Expert Dr. Gerry Bedore to its Scientific Advisory Board 2Profile Solutions Names Medicinal Cannabis, Agriculture and Technology Expert Dr. Gerry Bedore to its Scientific Advisory Board 3Profile Solutions Names Medicinal Cannabis, Agriculture and Technology Expert Dr. Gerry Bedore to its Scientific Advisory Board 4
... Yale School of Medicine have developed a simple urine ... but serious hypertensive complication of pregnancy. Dubbed the ... test accurately predicted preeclampsia in a study of 347 ... preventive care to pregnant women. The research will be ...
... , BLUE BELL, Pa. , Feb. 3 ... its Mexican subsidiary has been awarded a contract by the ... Affairs/National Citizen Registry) to create and manage an advanced citizen ... database with iris, fingerprint and facial biometric data on up ...
... the Himalayan mountains are thinning is not disputed. However, ... the causes. Lawrence Berkeley National Laboratory scientist Surabi Menon ... commonly blamed culpritgreenhouse gases, such as carbon dioxidefrom other ... melting. Menon and her collaborators found that airborne black ...
Cached Biology News:Yale-developed test can help predict and diagnose preeclampsia 2Unisys Awarded Contract to Provide Advanced Biometric Citizen Identification Solution to Government of Mexico 2Unisys Awarded Contract to Provide Advanced Biometric Citizen Identification Solution to Government of Mexico 3Black carbon a significant factor in melting of Himalayan glaciers 2Black carbon a significant factor in melting of Himalayan glaciers 3
(Date:4/28/2015)... April 28, 2015 According to a ... 450,000 patients receive medical treatment from burn injuries per ... burn injury, extensive formation of scars with subsequent contractures ... patients for which there is no adequate treatment. Contractures ... normal movement and can cause permanent deformity. , ...
(Date:4/28/2015)... First Harvest Financial is making ... advice to legal medical cannabis companies. With its rapid ... to start-ups and entrepreneurs, First Harvest Financial hired new ... Wall Street veteran, Kevin Gillespie, has handled the early ... Manager. Due to early success and achievement, First ...
(Date:4/28/2015)... York (PRWEB) April 28, 2015 Dr. ... sales, marketing, and customer service operations across the products ... Test , the first and only FDA-cleared test to ... to aid in embryo selection during IVF. , Dr. ... the field of Reproductive Sciences, including both laboratory management ...
(Date:4/28/2015)... 28, 2015 Spartan Bioscience today announced ... been selected by the Ottawa Chamber of Commerce as ... Lem was selected from over 240 applicants based on ... Prior to Spartan, Dr. Lem founded Plexagen Diagnostics, and ... He holds a Medical Degree from the University of ...
Breaking Biology Technology:Synedgen Burn Treatment Results Presented at Premier Wound Conference 2Synedgen Burn Treatment Results Presented at Premier Wound Conference 3Leading Medical Cannabis Advisor, First Harvest Financial, Welcomes Top Executives Aboard 2Leading Medical Cannabis Advisor, First Harvest Financial, Welcomes Top Executives Aboard 3Progyny Appoints Gary Harton as Group Senior Vice President, Commercial Development 2Spartan Bioscience Announces Paul Lem Named Ottawa’s Top 40 Under 40 2
... CENTREVILLE, Va., Jan. 25 Octapharma is ... member of the Biotechnology Industry,Organization. Membership in ... is the Association,s considerable influence on the ... some of the,largest and most research intensive ...
... 25 Today, the Board of Directors of US,Oncology ... Inc.,(collectively, "US Oncology" or the "Company") announced that, effective,February ... role as Chief,Executive Officer (CEO) and will continue as ... D. Broussard will become the Company,s,President and CEO. The ...
... Leuven, Belgium − 2 to 3 children in 100 are ... a genetic defect, but in 80% of the cases scientists ... connected to the Katholieke Universiteit Leuven, in collaboration with an ... these patients, the mental retardation is caused by a twofold ...
Cached Biology Technology:Octapharma Joins Biotechnology Industry Organization 2US Oncology Announces Realignment of Executive Team 2US Oncology Announces Realignment of Executive Team 3Discovery of new cause of mental retardation simplifies search for treatments 2
Mouse VEGF R1/Flt-1 Phycoerythrin MAb (Clone 141522) Keywords: Receptor Tyrosine Kinase, RTK, VEGFR1, VEGF Receptor 1 Protein Family: Receptor Tyrosine Kinases, VEGF/PDGF Family...
Recognizes Kir4.1. The epitope does not share homology with any other known proteins.,SPECIES REACTIVITIES: The antibody is also expected to work with mouse and human due to sequence homology. Oth...
... Development kit contains the basic components required ... measure natural and recombinant mouse Dickkopf homolog-1 ... Each kit contains sufficient materials to run ... that the following conditions are met: ...
HIV-1 TAT (vN-21)...
Biology Products: