Navigation Links
Penn research answers long-standing question about swimming in elastic liquids
Date:5/18/2011

PHILADELPHIA A biomechanical experiment conducted at the University of Pennsylvania School of Engineering and Applied Science has answered a long-standing theoretical question: Will microorganisms swim faster or slower in elastic fluids? For a prevalent type of swimming, undulation, the answer is "slower."

Paulo Arratia, assistant professor of mechanical engineering and applied mechanics, along with student Xiaoning Shen, conducted the experiment. Their findings were published in the journal Physical Review Letters.

Many animals, microorganisms and cells move by undulation, and they often do so through elastic fluids. From worms aerating wet soil to sperm racing toward an egg, swimming dynamics in elastic fluids is relevant to a number of facets of everyday life; however, decades of research in this area have been almost entirely theoretical or done with computer models. Only a few investigations involved live organisms.

"There have been qualitative observations of sperm cells, for example, where you put sperm in water and watch their tails, then put them in an elastic fluid and see how they swim differently," Arratia said. "But this difference has never been characterized, never put into numbers to quantify exactly how much elasticity affects the way they swim, is it faster or slower and why."

The main obstacle for quantitatively testing these theories with live organisms is developing an elastic fluid in which they can survive, behave normally and in which they can be effectively observed under a microscope.

Arratia and Shen experimented on the nematode C. elegans, building a swimming course for the millimeter-long worms. The researchers filmed them through a microscope while the creatures swam the course in many different liquids with different elasticity but the same viscosity.

Though the two liquid traits, elasticity and viscosity, sound like they are two sides of the same coin, they are actua
'/>"/>

Contact: Evan Lerner
elerner@upenn.edu
215-573-6604
University of Pennsylvania
Source:Eurekalert

Page: 1 2

Related biology news :

1. Wistar Institute researcher receives New Innovator award from NIH
2. NC State researchers get to root of parasite genome
3. White Mountain Research Station to host climate change conference
4. Stevens awarded $1M for advanced biofuels research
5. Researchers find animal with ability to survive climate change
6. Researchers find an essential gene for forming ears of corn
7. Researchers note differences between people and animals on calorie restriction
8. Researcher working on destruction of chemical weapons
9. Researchers study acoustic communication in deep-sea fish
10. Researchers discover that growing up too fast may mean dying young in honey bees
11. The Rett Syndrome Research Trust launches operations
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/14/2015)... April 14, 2015 NXT-ID, Inc. (NASDAQ: ... company focused on the growing mobile commerce market, announces ... the 2015 New York Design Awards under the category  ... York City Design Awards are part of a global ... 2,500 ratings from the marketplace, industry and judging panel. ...
(Date:4/13/2015)... 2015  higi, a leading cloud-based consumer engagement platform ... engage with their communities around health and wellness, announced ... secure API.  ... affordable, and convenient vehicle to receive validated health information ... The API will allow higi,s trusted partners, on ...
(Date:4/9/2015)... SAN JOSE, Calif. , April 9, 2015 /PRNewswire/ ... of human interface solutions, announced today that it will ... 2015 on Thursday, April 23, 2015, after the close ... call for analysts and investors at 2:00 p.m. PT ... information.    To participate on the live ...
Breaking Biology News(10 mins):NXT-ID's Wocket Smart Wallet Nominated for 2015 New York Design Awards in 'Product Design- Technology' 2NXT-ID's Wocket Smart Wallet Nominated for 2015 New York Design Awards in 'Product Design- Technology' 3higi Launches Seamless Access to HIPAA-Compliant Health Outcomes and Activity Data 2higi Launches Seamless Access to HIPAA-Compliant Health Outcomes and Activity Data 3Synaptics to Report Third Quarter Results on April 23 2
... Lecture has been awarded to John Ellis for his ... sciences. Ellis, an Emeritus Professor in the Department of ... UK, is the author of the Springer book How ... 1960 from King,s College, London, and completed postdoctoral studies ...
... hospitalized each year due to hyperemesis gravidarum (HG), an extreme ... often forces them to reluctantly terminate their pregnancies. ... on either side of the family who have experienced extreme ... heightened, according to a new study led by researchers from ...
... The Brazilian Instituto Nacional de Pesquisas Espaciais (INPE, ... auspices of the Ministrio da Cincia e Tecnologia ... installation of a supercomputer to be used for ... Climate System Model. The model is designed to ...
Cached Biology News:Study shows extreme form of pregnancy-related morning sickness could be genetic 2Supercomputer makes it possible to develop a Brazilian Global Climate System Model 2
(Date:4/16/2015)... Proove Biosciences , Inc. is pleased to ... for the 2015 BIO International Convention. Hosted by the ... will take place June 15-18 at the Pennsylvania Convention ... contest, industry leaders will be voting for companies they ... community voting period began on April 14, 2015 and ...
(Date:4/16/2015)... Ohio (PRWEB) April 16, 2015 ... Index, overexertion involving an outside source was ranked ... This includes injuries related to lifting, pushing, pulling, ... billion in direct costs. The David Round Company ... is committed to working hard to develop and ...
(Date:4/16/2015)... WESTON, Mass. , April 16, 2015  In recognition ... has collaborated with hemophilia advocacy groups to illuminate more than ... , including Boston,s Zakim Bridge ... New Orleans, Mercedes-Benz Superdome and ... will occur during the evening of April 17, and coincide ...
(Date:4/16/2015)... April 16, 2015 /CNW/ - Bioenterprise Corporation is pleased to ... in Charlottetown , PEI.  Bioenterprise has ... Island ADAPT Council for the commercialization of agricultural technologies ... working with PEI ADAPT.  They have been at the ... a decade," explains Dave Smardon , President & ...
Breaking Biology Technology:Proove Bisociences to Participate in the Buzz of BIO at the 2015 BIO International Convention 2Proove Bisociences to Participate in the Buzz of BIO at the 2015 BIO International Convention 3The David Round Company Helps Companies Meet OSHA Standards by Combining Safety, Ergonomics, and Productivity 2Biogen Shines A Light On Hemophilia Community By Illuminating U.S. Landmarks Red On World Hemophlia Day 2Biogen Shines A Light On Hemophilia Community By Illuminating U.S. Landmarks Red On World Hemophlia Day 3Biogen Shines A Light On Hemophilia Community By Illuminating U.S. Landmarks Red On World Hemophlia Day 4Bioenterprise Corporation Expands into the Maritimes 2
... Michael Su, M.S., ... , INTRODUCTION , Adenosine triphosphate ... assay of ATP can be used as a indicator of viable ... planthygiene for bacterial contamination in the food, drug, health care and ...
... INTRODUCTION , ... necessary to produce accurate results for dissolution testing of pharmaceutical ... laboratories. USP requirements for calibration are given in the Apparatus ... Each individual apparatus (i.e. spindle or basket) must be tested ...
... 1311 Orleans Dr., Sunnyvale, CA 94089., , , ... Introduction , ... Quantitation Kit from Molecular Probes in the Gemini XS, Gemini EM ... Pro software from Molecular Devices. Single-stranded DNA and oligonucleotides are traditionally ...
Cached Biology Technology:ATP Quantitation in the LMax Microplate Luminometer (MaxLine Application Note #40) 2ATP Quantitation in the LMax Microplate Luminometer (MaxLine Application Note #40) 3ATP Quantitation in the LMax Microplate Luminometer (MaxLine Application Note #40) 4Using the SpectraMax Plus for USP Dissolution Calibration (MaxLine Application Note #27) 2Using the SpectraMax Plus for USP Dissolution Calibration (MaxLine Application Note #27) 3Using the SpectraMax Plus for USP Dissolution Calibration (MaxLine Application Note #27) 4Using the SpectraMax Plus for USP Dissolution Calibration (MaxLine Application Note #27) 5Using the SpectraMax Plus for USP Dissolution Calibration (MaxLine Application Note #27) 6Using the SpectraMax Plus for USP Dissolution Calibration (MaxLine Application Note #27) 7Using the SpectraMax Plus for USP Dissolution Calibration (MaxLine Application Note #27) 8Using the SpectraMax Plus for USP Dissolution Calibration (MaxLine Application Note #27) 9Using the OligoGreen Oligonucleotide Quantitation Reagent in the Gemini XS, Gemini EM and SpectraMax M2 Microplate Readers (MaxLine Application Note #21) 2Using the OligoGreen Oligonucleotide Quantitation Reagent in the Gemini XS, Gemini EM and SpectraMax M2 Microplate Readers (MaxLine Application Note #21) 3Using the OligoGreen Oligonucleotide Quantitation Reagent in the Gemini XS, Gemini EM and SpectraMax M2 Microplate Readers (MaxLine Application Note #21) 4
Applications: Immunohistochemistry, ISH, FISH, CISH....
... TempliPhi 100 Amplification Kit, 100 reactions. ... sequencing in 4-6 h.Generate microgram quantities ... of starting material.Use amplified DNA directly ... from bacterial or M13 liquid cultures, ...
Immunogen: Synthetic peptide (KLH conjugated): L(506) S K S S S Q I R M S G L P A D N L A T(525) Storage: -20 C, Avoid Freeze/Thaw Cycles...
Polypropylene test tube racks, used in Thermo Forma's line of Test Tube Rack holders...
Biology Products: