Navigation Links
News tips from the journal mBio
Date:7/20/2011

Bacteria Change Shape to Survive Overcrowding

One species of bacteria have developed a unique mechanism for coping with overpopulation. They change their shape. Researchers at the University of Texas, Austin, describe a newly discovered mechanism that the bacterium Paenibacillus dendritiformis uses to survive overcrowding.

P. dendritiformis is typically a rod-shaped bacterium. As it grows it produces a toxic protein, called sibling lethal factor (Slf) which kills cells of encroaching sibling colonies. However, the researchers found that sublethal levels of Slf induce some of the rods to switch Slf-resistant cocci-shaped bacteria.

When crowding is reduced and nutrients are no longer limiting, the bacteria produce another signal that induces the cocci to switch back to rods, allowing the population to spread.

http://mbio.asm.org/content/2/3/e00069-11


Another Way for Cholera to Cause Disease

Cholera is a severe diarrheal disease typically caused by the O1 strain of the bacterium Vibrio cholerae. All pandemic O1 strains require two critical factors to cause disease: cholera toxin (CT) and toxin coregulated pilus (TCP). However, some nonpandemic strains of V. cholerae do not produce CT or TCP and yet still cause disease.

Researchers from Harvard Medical School, Brigham and Women's Hospital and the Howard Hughes Medical Institute studied one of those strains (AM-19226) which causes a rapidly fatal diarrheal disease in rabbits. Analysis of the genome showed that the bacterium lacked the genes that code for CT and TCP but instead carried a gene encoding a type III secretion system (TTSS), which other bacteria are known to use to infect host cells.

TTSS proved to be essential for AM-19226 virulence in rabbits. An AM-19226 derivative deficient for TTSS did not cause diarrhea or colonize the intestine.

"
'/>"/>

Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
Source:Eurekalert

Page: 1 2 3

Related medicine news :

1. Newsbriefs from the July issue of the journal Chest
2. Journal of Dental Research increases its scientific impact factor
3. Leading research organizations announce top-tier journal for biomedical and life sciences
4. Arab Journal of Gastroenterology accepted for MEDLINE indexing
5. AACRs CR magazine honored with 4 prestigious journalism awards
6. Chest journal news briefs -- June 2011 issue
7. Elsevier launches new journal: International Journal of Paleopathology
8. Chest journal news briefs, May 2011 issue
9. IADR/AADR Journal of Dental Research releases studies on oral health inequalities in older people
10. Springer launches new journal, Translational Behavioral Medicine: Practice, Policy, Research
11. Brachytherapy, the official journal of ABS, expands to 6 issues in 2011
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/21/2014)... Steven Reinberg HealthDay ... The number of U.S. teens using sunscreen dropped nearly 12 ... During that same time period, the number of teens using ... to use sunscreen increase the risk of skin cancers, including ... decrease in the overall percentage of teens who reported wearing ...
(Date:8/21/2014)... St. Louis, MO (PRWEB) August 21, 2014 ... work in family and product liability law, announces the ... The website provides comprehensive information on morcellator surgery ... the April 2014 FDA morcellator cancer warning and the ... news release* accompanying the April 17, 2014 FDA warning ...
(Date:8/21/2014)... announces the immediate release of Care of the ... CHEST Consensus Statement today in the Online First ... the global health-care community cares for patients with ... guide ethical decision-making, coordination of care, resource conservation, ... by over 100 clinicians and experts representing a ...
(Date:8/21/2014)... international scientific collaboration led by Baylor College of Medicine ... to a rare form of kidney cancer, providing new ... types as well. , The collaboration, a project of ... initiative , completed the sequence of chromophobe renal cell ... Cancer Cell . , "The Cancer Genome ...
(Date:8/21/2014)... have developed a genetically engineered line of mice that ... on epilepsy, Alzheimer,s and other diseases. , The ... of fluorescence in response to different calcium levels. This ... and microglia, to be studied in a new way. ... how the brain works," said Petr Tvrdik, Ph.D., ...
Breaking Medicine News(10 mins):Health News:Fewer U.S. Teens Using Sunscreen, Study Finds 2Health News:The Onder Law Firm Launches National Morcellator Cancer Lawsuit Center Website for Morcellator Surgery Lawsuits at MorcellatorCancerLawsuitCenter.com 2Health News:The Onder Law Firm Launches National Morcellator Cancer Lawsuit Center Website for Morcellator Surgery Lawsuits at MorcellatorCancerLawsuitCenter.com 3Health News:CHEST releases new expert guidance in care of the critically ill and injured 2Health News:Sequence of rare kidney cancer reveals unique alterations involving telomerase 2Health News:Sequence of rare kidney cancer reveals unique alterations involving telomerase 3Health News:Mouse model for epilepsy, Alzheimer's gives window into the working brain 2
... found that radiotherapy given in large dosage but in small ... UK and US said that 13 larger doses were found ... to the conventional regime of 25 small doses. The findings ... funded by the Cancer Research UK. They analysed 1,410 women ...
... driving skills of motorist has resulted in over 4,000 people ... the last three years// , said a senior Delhi Police ... around 1,500 sq km and it is difficult to control ... not up to the mark," Qamar Ahmed, joint commissioner, traffic, ...
... here who have been protesting the central government decision ... have sought// President A.P.J. Abdul Kalam's permission for self-immolation. ... seeking his "permission to immolate themselves", informed Ashutosh Dixit, ... of the junior doctors sitting on a relay hunger ...
... of alcohol may reduce the risk of heart disease than ... that it is applicable only for men and women are ... drinking patterns and heart health among men and women, but ... caution and should not be used to justify potentially harmful ...
... statistics regarding the use of tobacco amongst teenagers, which has ... tobacco and its products. , ,These figures were made ... World No Tobacco Day; on May 31st. This years theme ... or disguise,'' conveying cigarette smoking in any form is extremely ...
... major factor causing health concerns among both the pregnant woman ... that pregnant working// mothers who undergo a lot of stress ... these children were five ounces lighter than the average birth ... case pregnant smokers. These pregnant mothers put themselves through 32 ...
Cached Medicine News:Health News:Road Traffic Accidents Kill 4,000 people in Delhi 2Health News:Daily Intake Of Alcohol Reduces Heart Disease In Men Than Women 2
(Date:8/21/2014)... , Aug. 21, 2014 /CNW/ - Bedrocan Cannabis Corp., ... independent members to its Board of Directors, enhancing ... of the company, a leading licensed producer of ... Internationally, Bedrocan has 13 years, experience in producing ... seven countries, including Canada. As ...
(Date:8/21/2014)... CYBX ) today announced results for the quarter ended ... Operating results for the first quarter of fiscal ... other achievements, include: , Worldwide net product sales of ... net sales of $13.2 million, an increase of 14.5% on ... reached a new high of $58.8 million, an increase of ...
(Date:8/21/2014)... MENLO PARK, Calif. , Aug. 21, 2014 /PRNewswire/ ... company in the emerging field of regenerative medicine, announced ... ("Nat") Ricciardi to the Company,s newly expanded Board of ... now comprises eight directors, three of whom are independent. ... years of experience working with emerging growth companies. He ...
Breaking Medicine Technology:Senior Life Sciences Executives Join Bedrocan as Independent Directors 2Senior Life Sciences Executives Join Bedrocan as Independent Directors 3Cyberonics Reports Fiscal 2015 First Quarter Results 2Cyberonics Reports Fiscal 2015 First Quarter Results 3Cyberonics Reports Fiscal 2015 First Quarter Results 4Cyberonics Reports Fiscal 2015 First Quarter Results 5Cyberonics Reports Fiscal 2015 First Quarter Results 6Cyberonics Reports Fiscal 2015 First Quarter Results 7Cyberonics Reports Fiscal 2015 First Quarter Results 8Cyberonics Reports Fiscal 2015 First Quarter Results 9Cyberonics Reports Fiscal 2015 First Quarter Results 10Cyberonics Reports Fiscal 2015 First Quarter Results 11Cyberonics Reports Fiscal 2015 First Quarter Results 12Cyberonics Reports Fiscal 2015 First Quarter Results 13Cyberonics Reports Fiscal 2015 First Quarter Results 14Cyberonics Reports Fiscal 2015 First Quarter Results 15Cyberonics Reports Fiscal 2015 First Quarter Results 16Asterias Biotherapeutics Appoints Two Independent Directors and Announces Completion of Series A Common Stock Distribution 2Asterias Biotherapeutics Appoints Two Independent Directors and Announces Completion of Series A Common Stock Distribution 3Asterias Biotherapeutics Appoints Two Independent Directors and Announces Completion of Series A Common Stock Distribution 4
... 28, 2011 Tengion, Inc. (Nasdaq: TNGN ) ... to its Board of Directors. Mr. Flora brings to Tengion ... wound healing and surgical device businesses.  He most recently served ... Tengion also announced today that Gary Kurtzman, ...
... SOUTH SAN FRANCISCO, Calif., Sept. 28, 2011 Onyx ... that it has completed the New Drug Application (NDA) ... under the accelerated approval process for carfilzomib, a next ... with relapsed and refractory multiple myeloma. In addition, Onyx ...
Cached Medicine Technology:Tengion Appoints Scott Flora to Board of Directors 2Tengion Appoints Scott Flora to Board of Directors 3Tengion Appoints Scott Flora to Board of Directors 4Onyx Pharmaceuticals Submits New Drug Application for Carfilzomib in Relapsed and Refractory Multiple Myeloma 2Onyx Pharmaceuticals Submits New Drug Application for Carfilzomib in Relapsed and Refractory Multiple Myeloma 3Onyx Pharmaceuticals Submits New Drug Application for Carfilzomib in Relapsed and Refractory Multiple Myeloma 4
...
...
Bimanual I&A Cannulas. Curved 45 with a .51mm open-end irrigation port. Facilitates removal of cortical debris between 10-2 o'clock. .80mm x 17.0mm...
...
Medicine Products: