Navigation Links
Predatory bacterial swarm uses rippling motion to reach prey
Date:10/29/2008

pattern as the swarm moves through the prey cells," Kirby said. "We now know that this rippling pattern is the highly organized behavior of thousands of cells working in concert to digest the prey."

Unlike the random motion M. xanthus exhibits at low levels of prey, the study shows that during predation, individual M. xanthus cells line up perpendicular to the axis of the ripple and move back and forth. This motion of individual cells, known as cell reversal produces an alternating pattern of high and low cell density like crests and troughs of waves, and the overall motion of the wave formation is directed toward prey.

The UI team also showed that the ripple wavelength is adaptable and dependent of how much prey is available. At high prey density, M. xanthus forms ripples with shorter wavelengths. As prey density decreases, the ripple wavelength gets longer. Eventually, when there is no more prey, the rippling behavior dissipates.

"The rippling appears to enhance predation by keeping more M. xanthus cells in the location of the prey cells," Kirby said.

Finally, the UI study found that the bacteria use a chemotaxis-like signaling pathway to regulate multi-cellular rippling during predation.

Individual M. xanthus cells move by shooting rope-like projections called pili from either end of the cell. These pili attach to surfaces allowing cells to pull themselves forward or backward in a "spiderman" type motion known as cell reversal. The genes that regulate this cell reversal process are chemotaxis-like genes.

The UI team mutated two genes in this pathway to study their effect on the predatory ability of the bacterium. One mutant strain rippled continuously even in the absence of prey, and individual cells exhibited a hyper-reversing action. Conversely, the second mutation produced bacteria that were not able to ripple at all.

Both mutants were unable to respond to change
'/>"/>

Contact: Jennifer Brown
jennifer-l-brown@uiowa.edu
319-335-9917
University of Iowa
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Fishing ban guards coral reefs against predatory starfish outbreaks
2. Gene against bacterial attack unravelled
3. Study reveals how viruses collectively decide the fate of a bacterial cell
4. New paper sheds light on bacterial cell wall recycling
5. Bacterial persistence in streams
6. A survivor in Greenland: A novel bacterial species is found trapped in 120,000-year-old ice
7. Bacterial slime helps cause serious disease
8. Tomato pathogen genome may offer clues about bacterial evolution
9. Biologists surprised to find parochial bacterial viruses
10. Biochemists reveal details of mysterious bacterial microcompartments
11. Tomato pathogen genome may offer clues about bacterial evolution at dawn of agriculture
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/18/2014)... that can operate inside the bore of an MRI ... biomedical research partnership program at Brigham and Women,s Hospital ... robot, in conjunction with real-time MRI images, can make ... less discomforting for the patient. The novel system also ... greater precision. , Developed by a team of robotics ...
(Date:9/18/2014)... Americans to undertake jaunts into the countryside each year could ... a century, according to new research. , Climate change could ... States as summer temperatures linger later into the year, Princeton ... Biogeography . For instance, the paper birch a popular ... could change color one to three weeks later by ...
(Date:9/18/2014)... -- Arizona turned its newborn screening program into a model ... earning it the first-ever Newborn Screening Quality Award from the ... Will Humble, M.P.H., Arizona,s Department of Health Services director, with ... established a policy of full transparency for the length of ... to the lab for analysis, and set a target of ...
Breaking Biology News(10 mins):Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 2Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 3Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 4Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 5Fall foliage season may be later, but longer on warmer Earth 2Fall foliage season may be later, but longer on warmer Earth 3Fall foliage season may be later, but longer on warmer Earth 4March of Dimes honors Arizona with first-ever newborn screening award 2March of Dimes honors Arizona with first-ever newborn screening award 3
... has declined steadily in the last three decades. Although ... groups have shown some improvement, according to a recent ... the American Association for Cancer Research. "Our ... treatment, have resulted in profound gains, but these gains ...
... Barbara, Calif.) Scientists at UC Santa Barbara have found ... findings are published online in this week,s issue of the ... species differences in how they use the environment are key ... around us, but the importance of such niches have never ...
... the human brain reshapes itself to store this newfound knowledge. ... does that capacity to adapt reflect our risk for Alzheimer,s ... lives? Dr. Yaniv Assaf of Tel Aviv University,s Department ... effect of memory on brain structure. "With a specific MRI ...
Cached Biology News:Cancer mortality rates experience steady decline 2Scientists demonstrate importance of niche differences in biodiversity 2A window into the brain 2
(Date:9/18/2014)... 2014 HealthTronics, Inc ., ... radiology products and services, announced that a poster ... cryoablation) versus external beam radiotherapy (EBRT) is being ... Urological Association (MAAUA) Annual Meeting in Baltimore, Maryland ... of Cryosurgery and External Beam Radiation as Treatments ...
(Date:9/18/2014)... DALLAS , Sept. 18, 2014 /PRNewswire-iReach/ -- ... and China Acetic Acid Industry" and "2014 Deep ... Industry" reports to its research database. ... 2014 Deep Research Report on Global and China ... research report on China ...
(Date:9/18/2014)... , Sept. 18, 2014  Health Enhancement Products, Inc. ... investigating early-stage algae bioactive compounds and metabolic processes, is pleased ... company,s board of directors. Ms. Nola E. Masterson , ... advisor joined the board effective September 17, 2014. ... agree to join our board," states Andrew Dahl , ...
(Date:9/18/2014)... Texas (PRWEB) September 18, 2014 ... Chancellor John Sharp, Texas A&M Health Science Center ... U.S. Department of Health and Human Services (HHS), ... dedicated a national pandemic influenza vaccine manufacturing facility ... as an anchor for the Texas A&M Biocorridor ...
Breaking Biology Technology:HealthTronics Announces Data Comparing Cryotherapy Versus Radiation for Treating Prostate Cancer Poster Presented at the American Urological Association Regional Meeting 2Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 2Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 3Acetic Acid Market & Sodium Stannate Industry (China, Global) Research Report 4Health Enhancement Announces New Board Member In Advance Of Annual Shareholder Meeting 2Texas A&M Dedicates National Pandemic Influenza Vaccine Manufacturing Facility, on Track for 2016 Start-Up Phase 2Texas A&M Dedicates National Pandemic Influenza Vaccine Manufacturing Facility, on Track for 2016 Start-Up Phase 3Texas A&M Dedicates National Pandemic Influenza Vaccine Manufacturing Facility, on Track for 2016 Start-Up Phase 4
... 2011 Insmed Incorporated (Nasdaq: INSMD), a biopharmaceutical company, ... (IND) to conduct a pivotal Phase 3 clinical trial ... nontuberculous mycobacteria (NTM) lung infections has been cleared by ... In 2010, Insmed initially submitted a regulatory filing ...
... 2011 Cell Therapeutics, Inc. ("CTI") (Nasdaq and MTA: ... pivotal trial of pixantrone for the treatment of relapsed/refractory ... now open to patient enrollment. The trial, referred to ... a combination of pixantrone plus rituximab to a combination ...
... Driving value for customers is critical to organizational success across ... customer and an organization, there has to be an integrated ... succeed in the marketplace. Chris Bogan, CEO ... in this month,s special issue of PharmaVoice that the state ...
Cached Biology Technology:Insmed Announces FDA Clearance of IND for Pivotal Phase 3 Trial of ARIKACE™ in Nontuberculous Mycobacteria Indication 2Insmed Announces FDA Clearance of IND for Pivotal Phase 3 Trial of ARIKACE™ in Nontuberculous Mycobacteria Indication 3Insmed Announces FDA Clearance of IND for Pivotal Phase 3 Trial of ARIKACE™ in Nontuberculous Mycobacteria Indication 4Insmed Announces FDA Clearance of IND for Pivotal Phase 3 Trial of ARIKACE™ in Nontuberculous Mycobacteria Indication 5Cell Therapeutics Initiates Pixantrone PIX-R Pivotal Trial for Treatment of Patients With Relapsed/Refractory Diffuse Large B-cell Lymphoma 2Cell Therapeutics Initiates Pixantrone PIX-R Pivotal Trial for Treatment of Patients With Relapsed/Refractory Diffuse Large B-cell Lymphoma 3Cell Therapeutics Initiates Pixantrone PIX-R Pivotal Trial for Treatment of Patients With Relapsed/Refractory Diffuse Large B-cell Lymphoma 4Best Practices, LLC Showcases Its Expertise in Customer Relationship Management 2
... 2D polyacrylamide gel electrophoresis (2D-PAGE) with biological ... core technology platform for proteomic analysis. 2D-PAGE ... samples limited only in the dynamic range ... proteins. Quantitative image based analysis of separated ...
... 177 amino acid polypeptide sequence corresponding to ... Produced by activation of a recombinant ... coli periplasm. SPECIFIC ACTIVITY:The specific activity ... mU/mg, where 1 U is the activity ...
Human interferon-beta (IFN-beta). Recognizes amino acids 30-47 of IFN-beta. No cross-reactivity with Human IFN-alpha or IFN-gamma....
Acetate Plate Sealers 100/Box...
Biology Products: