Navigation Links
Buckling up to turn
Date:7/8/2013

Bacteria swim by rotating the helical, hairlike flagella that extend from their unicellular bodies. Some bacteria, including the Escherichia coli (E. coli) living in the human gut, have multiple flagella that rotate as a bundle to move the cell forward. These cells turn somewhat acrobatically by unbundling their flagella, causing the cell to tumble, reorient and strike out in another direction.

But many microbes, including 90 percent of motile marine bacteria, have only a single rigid flagellum; they are able to swim both forward and backward by rotating this flagellum either counterclockwise or clockwise. These microbes change direction with a sideways "flick" of their lone flagellum -- a flick first documented in 2011 as a unique swimming stroke whose mechanism has remained a mystery.

Now, using high-speed video to record individual swimming bacteria at up to 1,000 frames per second, researchers at MIT have seen that the flick occurs when the so-called "hook," a small flexible rod connecting the flagellum to the cell's internal motor, buckles during forward swims. The drag on the cell head caused by the water's resistance combines with the opposing thrust force from the rotating flagellum to compress the hook, causing it to buckle and flick the cell into a 90-degree reorientation, the researchers say in a paper published online July 7 in Nature Physics. The ability to reorient by flicking ultimately helps bacteria make their way toward food in the nutrient-sparse ocean.

This might seem like an awkward means of navigation. But when you consider that marine bacteria can swim at nearly 100 body lengths per second the equivalent of a car traveling 900 mph, faster than the speed of sound -- and the flagellum spins at more than 1,000 revolutions per second, the 10-millisecond buckling of the hook seems a little more spectacular. The mechanism is of particular interest to engineers, who traditionally focus on the prev
'/>"/>

Contact: Denise Brehm
brehm@MIT.EDU
617-253-8069
Massachusetts Institute of Technology
Source:Eurekalert

Page: 1 2 3 4

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/16/2014)... Keystone XL pipeline (KXL) would likely increase oil sands ... surveyed by the non-profit organization Near Zero. The results ... Impact," and includes both supporters and opponents of the ... sands could lead to significantly higher greenhouse gas emissions, ... respond. , "This report examines three main scenarios ...
(Date:9/16/2014)... Spain culminating the around the world of the Malaspina ... the global ocean works and what is its health ... is not limited to coastal areas, but also occurs ... it is already affecting the ocean ecosystem. ,This and ... for Researchers in Barcelona, in a congress that ends ...
(Date:9/16/2014)... If Scotland votes for independence later this week, its ... Scottish people that fracking is necessary, research has revealed. ... been tracking public perception of shale gas extraction in ... people living north of the border are the least ... the research in the University,s School of Geography, said: ...
Breaking Biology News(10 mins):Keystone XL would likely raise oil sands production and greenhouse gas emissions 2The Malaspina Expedition confirms that pollution reaches even the most remote areas of the ocean 2The Malaspina Expedition confirms that pollution reaches even the most remote areas of the ocean 3Scottish people most sceptical on fracking, survey shows 2Scottish people most sceptical on fracking, survey shows 3
... than at any time in the previous 1,500 years, a ... Nature Geoscience . The rise in temperature ... productivity of the lake, which hosts the second-largest inland fishery ... fish from Lake Tanganyika as a crucial source of protein," ...
... Ind. - Using NASA satellite data and Google Earth, ... North Korea has been logging in what is designated ... Shao, professor of geo-eco-informatics, studies the Mount Paekdu Biosphere ... many researchers are unable to visit North Korea, Shao ...
... from the Virginia Bioinformatics Institute (VBI) at Virginia Tech ... crops in developing countries from devastating attacks from plant ... from the BREAD (Basic Research to Enable Agricultural Development) ... the Bill & Melinda Gates Foundation (BMGF). VBI ...
Cached Biology News:Twentieth-century warming in Lake Tanganyika is unprecedented 2Twentieth-century warming in Lake Tanganyika is unprecedented 3NASA, Google data show North Korea logging in protected area 2Plant protection research targets cacao in developing countries 2
(Date:9/15/2014)... Bioptigen announced today the availability of ... optical device metrology and pre-clinical ophthalmic research markets. ... Contact Lens Metrology is designed for non-destructive, non-contact, full ... IOL structures, and donor tissues. The metrology ... in a hydration bath (saline), automated segmentation of anterior ...
(Date:9/15/2014)... AUSTIN, Texas , Sept. 15, 2014 The ... changes in climate, says a new article published by the ... Ahmed , PhD, on climate change and its effects on ... part of an extensive study conducted by Dr. Ahmed in ... China and has implications for the future ...
(Date:9/15/2014)... Maryland , 15 de septiembre de 2014 ... se llevará a cabo del 12 al 18 de octubre. ... (PPTA) y de sus compañías miembro s, la ... la concienciación mundial en torno a la colección de fuentes ... donantes de plasma al salvar y mejorar las vidas ...
(Date:9/14/2014)... variety of ways, including by modifying the protein structure. ... form and perform no or even the "wrong" function: ... diseases such as Alzheimer,s, Parkinson,s or cystic fibrosis. Some ... other molecules of the same type and congregate into ... damage cells and tissues and make people ill. , ...
Breaking Biology Technology:Bioptigen Introduces Deep Imaging OCT System for Contact Lens Metrology 2Tea Taste and Quality Affected by Climate Change 2Tea Taste and Quality Affected by Climate Change 3Tea Taste and Quality Affected by Climate Change 4La International Plasma Awareness Week será una celebración para los donantes 2La International Plasma Awareness Week será una celebración para los donantes 3Measuring modified protein structures 2Measuring modified protein structures 3
... NEW BRUNSWICK, N.J., Feb. 18 Senesco Technologies, Inc. ... reported financial results for the three months ended December 31, ... 31, 2008 was $1,624,341, or $0.09 per share, compared with ... the three month period ended December 31, 2007. This ...
... Trusted LASIK Surgeons directory service and website at ... to improve their vision and find a highly qualified ... directory apart is a unique screening process ensuring that ... eye surgery and laser eye surgery in the United ...
... Feb. 17 Frost & Sullivan, the,Growth Partnership Company, ... thanks in part to an unprecedented US $1 trillion,stimulus ... from,foreign governments. , (Logo: ... Obama,s stimulus package is clearly serving to convince,businesses and ...
Cached Biology Technology:Senesco Technologies Reports Second Quarter Fiscal 2009 Financial Results 2Senesco Technologies Reports Second Quarter Fiscal 2009 Financial Results 3Senesco Technologies Reports Second Quarter Fiscal 2009 Financial Results 4Senesco Technologies Reports Second Quarter Fiscal 2009 Financial Results 5Senesco Technologies Reports Second Quarter Fiscal 2009 Financial Results 6Senesco Technologies Reports Second Quarter Fiscal 2009 Financial Results 7Dr. Lawrence Spivack, a LASIK Eye Surgeon Expert Serving Denver, Colorado, Joins Elite Circle of Surgeons Listed at Trusted LASIK Surgeons 2Dr. Lawrence Spivack, a LASIK Eye Surgeon Expert Serving Denver, Colorado, Joins Elite Circle of Surgeons Listed at Trusted LASIK Surgeons 3Dr. Lawrence Spivack, a LASIK Eye Surgeon Expert Serving Denver, Colorado, Joins Elite Circle of Surgeons Listed at Trusted LASIK Surgeons 4Dr. Lawrence Spivack, a LASIK Eye Surgeon Expert Serving Denver, Colorado, Joins Elite Circle of Surgeons Listed at Trusted LASIK Surgeons 5Dr. Lawrence Spivack, a LASIK Eye Surgeon Expert Serving Denver, Colorado, Joins Elite Circle of Surgeons Listed at Trusted LASIK Surgeons 6Dr. Lawrence Spivack, a LASIK Eye Surgeon Expert Serving Denver, Colorado, Joins Elite Circle of Surgeons Listed at Trusted LASIK Surgeons 7Dr. Lawrence Spivack, a LASIK Eye Surgeon Expert Serving Denver, Colorado, Joins Elite Circle of Surgeons Listed at Trusted LASIK Surgeons 8Frost & Sullivan Forecasts Early Rebound: Strong Growth Ahead for Global Economy 2
Request Info...
Request Info...
Any form, any size, any number of mutageneses. ExonBio provides the best service with double sequecing to make sure the success of the mutagenesis....
Please email us with project details and we will respond within 24 hours to your query!...
Biology Products: