Navigation Links
Scientists pitch in to help keep salad mixes safe to eat
Date:6/14/2011

This release is available in Spanish.

It's no wonder that packaged salad mixes are a produce section favorite. They offer convenience, selection, and quality, and perhaps best of all, they free us from the chore of washing and chopping, slicing, or shredding salad greens.

But outbreaks of foodborne illness have, from time to time, been associated with bagged salad greens. The outbreaks have led the fresh-cut produce industry to voluntarily adopt stringent quality-control standards.

U.S. Department of Agriculture (USDA) food safety researchers are pitching in to help keep salad mixes safe to eat. Innovative studies led by Agricultural Research Service (ARS) microbiologist Maria T. Brandl are providing new information about the impressive array of genes that a major foodborne pathogen, Escherichia coli O157:H7, calls into action when attempting to colonize leaves of fresh-cut lettuce.

ARS is USDA's principal intramural scientific research agency. This research supports the USDA priority of ensuring food safety

Mechanical cutting of lettuce leaves into large pieces or shredding of leaves into narrow strips, like those in taco filling, breaks lettuce cells, explains Brandl. The broken cells exude carbohydrates, which the microbe can use as a source of energy. But injured cells can also leak natural compounds such as antimicrobials that are problematic for the pathogen.

A study with romaine lettuce that Brandl and her coinvestigators published in Applied and Environmental Microbiology in 2010 showed that E. coli, when exposed in lab tests to the contents of broken lettuce leaf cells, can adapt quickly. Using an approach known as microarray-based whole genome transcriptional profiling, the researchers determined that the pathogen uses its genetic arsenal to protect itself against not only the antimicrobial compounds, but also against oxidative stress, osmotic stress, damage to its DNA and other threats to its ability to survive and multiply.

The investigation--the first to provide extensive details about the biology of E. coli O157:H7 in fresh-cut lettuce--has paved the way for followup experiments that Brandl and coworkers hope will lead to new technologies to overcome the pathogen's defenses.


'/>"/>

Contact: Marcia Wood
marcia.wood@ars.usda.gov
301-504-1662
United States Department of Agriculture - Research, Education and Economics
Source:Eurekalert

Related biology news :

1. Top Latin-American scientists named 2011 Pew Fellows in the Biomedical Sciences
2. 22 of Americas most promising scientists selected as 2011 Pew Scholars in the Biomedical Sciences
3. Scientists find deadly amphibian disease in the last disease-free region of central America
4. Social scientists study impact of human adult stem cell research
5. Scripps Research scientists awarded $2.2 million to develop treatment for multi-drug addiction
6. Scientists learn from kids, kids become scientists in new MU effort
7. UCLA scientists identify how major biological sensor in the body works
8. Stanford climate scientists forecast permanently hotter summers
9. Scientists uncover role for cell scaffold in tumor formation
10. Scientists use super microscope to pinpoint body’s immunity switch
11. Scripps Research scientists find way to block stress-related cell death
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/1/2016)... -- Favorable Government Initiatives Coupled With Implementation ... to Boost Global Biometrics System Market Through 2021  ... " Global Biometrics Market By Type, By End ... - 2021", the global biometrics market is projected to ... growing security concerns across various end use sectors such ...
(Date:5/9/2016)... 2016 Elevay is currently known ... freedom for high net worth professionals seeking travel for ... connected world, there is still no substitute for a ... sealing your deal with a firm handshake. This is ... advantage of citizenship via investment programs like those offered ...
(Date:4/26/2016)... , April 27, 2016 ... the  "Global Multi-modal Biometrics Market 2016-2020"  report to ... ) , The analysts forecast the ... CAGR of 15.49% during the period 2016-2020.  ... number of sectors such as the healthcare, BFSI, ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... BEACH, Calif. , June 23, 2016  Blueprint ... new biological discoveries to the medical community, has closed ... co-founder Matthew Nunez . "We have ... us with the capital we need to meet our ... will essentially provide us the runway to complete validation ...
(Date:6/23/2016)... ... June 23, 2016 , ... ClinCapture, the only free validated ... will showcase its product’s latest features from June 26 to June 30, 2016 ... on Disrupting Clinical Trials in The Cloud during the conference. DIA (Drug ...
(Date:6/23/2016)... 22, 2016  Amgen (NASDAQ: AMGN ) ... QB3@953 life sciences incubator to accelerate the development ... laboratory space at QB3@953 was created to help high-potential ... for many early stage organizations - access to laboratory ... Amgen launched two "Amgen Golden Ticket" awards, providing each ...
(Date:6/22/2016)... June 22, 2016 Research and Markets has ... report to their offering. ... 2014 from $29.3 billion in 2013. The market is expected to ... from 2015 to 2020, increasing from $50.6 billion in 2015 to ... forecasts during the forecast period (2015 to 2020) are discussed. As ...
Breaking Biology Technology: