Navigation Links
How do bacteria swim? Brown physicists explain
Date:11/19/2008

PROVIDENCE, R.I. [Brown University] Imagine yourself swimming in a pool: It's the movement of your arms and legs, not the viscosity of the water, that mostly dictates the speed and direction that you swim.

For tiny organisms, the situation is different. Microbes' speed and direction are subjected more to the physical vagaries of the fluid around them.

"For bacteria to swim in water," explained Jay Tang, associate professor of physics at Brown University, "it's like us trying to swim through honey. The drag is dominant."

Tang and his team at Brown have just completed the most detailed study of the swimming patterns of one particular bacterium, Caulobacter crescentus. In a paper published online this week in the Proceedings of the National Academy of Sciences (in print Nov. 25), the researchers show how this microbe's movement is affected by drag and a phenomenon called Brownian motion. The observations would appear to hold true for many other bacteria, Tang said, and shed light on how these organisms scavenge for food and how they approach surfaces and "stick" to them.

Caulobacter is a single-celled organism with a filament-like tail called a flagellum. As it swims, its rounded cellular head rotates in one direction, while the tail rotates in the opposite direction. This creates torque, which helps explain the bacterium's nonlinear movement through a fluid. What Tang and his team found, however, is that Caulobacter also is influenced by Brownian motion, which is the zigzagging motion that occurs when immersed particles are buffeted by the actions of the molecules of the surrounding medium. What that means, in effect, is that Caulobacter is being pinballed by the water molecules surrounding it as it swims.

This twin effect of hydrodynamic interaction and Brownian motion governs the circular swimming patterns of Caulobacter and many other microorganisms, the scientists found.

"Random forces are alwa
'/>"/>

Contact: Richard Lewis
Richard_Lewis@Brown.edu
401-863-3766
Brown University
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Shuttle brings space-grown strep bacteria back for study
2. The worlds oldest bacteria
3. Bacteria from sponges make new pharmaceuticals
4. Boston University biomedical engineers find chink in bacterias armor
5. University of Leicester scientists discover technique to help friendly bacteria
6. Spaceflight shown to alter ability of bacteria to cause disease
7. A tiny pinch from a z-ring helps bacteria cells divide
8. Legionnaires bacterial proteins work together to survive
9. Scripps research team blocks bacterial communication system to prevent deadly staph infections
10. NSF awards Stevens team $1 million for research on smart, bacteria-repellent nanohydrogels
11. Chemical compound present in detergents produce bacteria alterations in agricultural soils
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
How do bacteria swim? Brown physicists explain
(Date:8/12/2015)... Aug. 12, 2015  Synaptics Inc. (NASDAQ: ... solutions, today announced that four of its fingerprint ... have officially been named FIDO Certified™ by the ... the certification, Synaptics, Natural ID™ fingerprint solutions are ... Framework (UAF) standard and are interoperable among other ...
(Date:8/6/2015)... Aug. 6, 2015  Today, U.S. Congressman ... Crossmatch ™ to learn firsthand how Silicon Valley ... Crossmatch is a world leader in multi-factor identity ... are helping federal agencies and commercial organizations achieve ... "The vast majority of network breaches ...
(Date:8/5/2015)... York , August 5, 2015 ... report titled "Facial Recognition Market - Global Industry Analysis, ... the global market for facial recognition is forecast to ... driven by increased demand for surveillance systems by civil ... rising number of crimes and terrorist activities across the ...
Breaking Biology News(10 mins):Synaptics Announces FIDO Certification of Natural ID Fingerprint Solutions 2Synaptics Announces FIDO Certification of Natural ID Fingerprint Solutions 3Rep. Honda to Visit Crossmatch in Redwood City 2Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 2Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 3Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 4Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 5Facial Recognition Market Expected to Reach US$ 2.67 Bn by 2022, at a CAGR of 9.5% From 2015 - 2022: Transparency Market Research 6
... has made an important advance in our understanding of ... industrialized world. Professor Jeremy R. Jass, who holds a ... in Montreal, and colleagues in Australia and Japan have ... inherited. The new syndrome is characterized by distinctive clinical, ...
... Genomics, Inc. today announced the release of ... of biological pathways and gene regulation networks ... companies. PathwayStudio?Central is available for a free ... builds pathways from microarray data, identifies biomarkers, ...
... Ariadne Genomics, Inc. today announced the launch ... Processing-based tool for automated extraction of biological ... other text sources. A demo version of ... leverages hand-crafted dictionaries of protein and chemical ...
Cached Biology News:Important discovery about second most fatal cancer 2Ariadne Genomics Announces the Release of PathwayStudio?Central, Client-Server Software for Biological Pathway Analysis 2 Software Tool for Converting Scientific Text into a Database of Functional Relationships 2
(Date:8/27/2015)... , Aug. 27, 2015  Neogen Corporation (NASDAQ: ... the stock of United Kingdom -based ... microbiological culture media and diagnostic systems. ... into a leading provider of microbial testing and diagnostic ... testing markets. The company currently sells into more than ...
(Date:8/27/2015)... Aug. 27, 2015 The National Necrotizing ... eyes—and life—were saved by doctors at Vanderbilt University Hospital ... NNFF, NovaBay Pharmaceuticals and Dr. John Crew , ... at Seton Medical Center in Daly City, ... a breakthrough approach, pioneered by Dr. Crew, that had ...
(Date:8/27/2015)... 2015 /PRNewswire/ - BIOREM Inc. (TSXV: BRM) ("Biorem" or "the Company") ... June 30, 2015. Biorem,s complete second quarter financial statements and MD&A ... HIGHLIGHTS: in ,000,s except earnings per shareThree-months ended , Six -months endedJune ... 2015 , 2014 Revenue , 4,709 ... Gross profit , 1,656 , 56 , ...
(Date:8/27/2015)... August 27, 2015 GlassesOff (OTCBB: GLSO), ... functions in the human vision system, announced today a partnership ... guard Chris Paul to develop a new mobile ... to improve their real-life on-court performance. Vision is ... it is shooting a ball or blocking a pass. The ...
Breaking Biology Technology:Neogen acquires U.K.-based Lab M Holdings 2Patient's Life and Eyes Saved from Gruesome Flesh-Eating Infection Consuming Her Face 2Patient's Life and Eyes Saved from Gruesome Flesh-Eating Infection Consuming Her Face 3BIOREM Reports $718,000 Net Earnings for the Second Quarter 2BIOREM Reports $718,000 Net Earnings for the Second Quarter 3Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 2Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 3
... 28 The results of a,study on children ... product, which is due to receive German market,authorisation ... which was carried out on 280,patients in 5 ... main evaluation criterion by,demonstrating a statistically significant reduction ...
... Institute of Standards and Technology (NIST) have demonstrated ... cracks and breakdown in bulk silicon crystalsa phenomenon ... thought not to exist. Their recently published* results ... silicon-based micro-electromechanical system (MEMS) devices that have been ...
... Pharmaceuticals,Inc. (NASDAQ: ANPI , TSX: ANP), a ... to participate in the Bank of America,2007 Credit ... 4 in Orlando, FL., Tom Bailey, Angiotech ... followed by a 25-minute Question and Answer period ...
Cached Biology Technology:STALLERGENES: ORALAIR Grasses: Positive Results of VO52.06 Paediatric Study 2Job-related stress: NIST demonstrates fatigue effects in silicon 2
... locus encodes two unrelated proteins both of ... the cell cycle in a p53-dependent manner. ... rapid degradation of mdm2 proteinrequired for mdm2 ... This interaction is mediated by the ...
... Loading Buffer contains a precipitant to ensure that ... tracking dye to allow the user to follow ... ReddyRun™: ABgene ® s proprietary mixture ... same buffer composition used in ReddyRun™ molecular weight ...
Acetylcholinesterase from human and monkey....
MAb to IgG2 (Fc gamma-2) IgG2 (Fc, gamma-2 epitope)...
Biology Products: