Navigation Links
'Gray's Paradox' solved: Researchers discover secret of speedy dolphins
Date:11/24/2008

have special drag-reducing properties.

More than 70 years later, Wei has developed a tool that conclusively measures the force a dolphin generates with its tail.

Wei created this new state-of-the-art water flow diagnostic technology by modifying and combining force measurement tools developed for aerospace research with a video-based flow measurement technique known as Digital Particle Image Velocimetry, which can capture up to 1,000 video frames per second.

Wei videotaped two bottlenose dolphins, Primo and Puka, as they swam through a section of water populated with hundreds of thousands of tiny air bubbles. He then used sophisticated computer software to track the movement of the bubbles. The color-coded results show the speed and in what direction the water is flowing around and behind the dolphin, which allowed researchers to calculate precisely how mush force the dolphin was producing.

See a DPIV video of Primo here: http://www.rpi.edu/news/video/wei/dolphin.html

Wei also used this technique to film dolphins as they were doing tail-stands, a trick where the dolphins "walk" on water by holding most of their bodies vertical above the water while supporting themselves with short, powerful thrusts of their tails.

The results show that dolphins produce on average about 200 pounds of force when flapping their tail about 10 times more force than Gray originally hypothesized.

"It turns out that the answer to Gray's Paradox had nothing to do with the dolphins' skin," Wei said. "Dolphins can certainly produce enough force to overcome drag. The scientific community has known this for a while, but this is the first time anyone has been able to actually quantitatively measure the force and say, for certain, the paradox is solved."

At peak performance, the dolphins produced between 300 and 400 pounds of force. Human Olympic swimmers, by comp
'/>"/>

Contact: Michael Mullaney
mullam@rpi.edu
518-276-6161
Rensselaer Polytechnic Institute
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Researchers explain nitrogen paradox in forests
2. Killer freeze of 07 illustrates paradoxes of warming climate
3. Ants may help researchers unlock mysteries of human aging process
4. Household exposure to toxic chemicals lurks unrecognized, researchers find
5. Soybean grant gives researchers tools to unravel better bean
6. Researchers shed new light on catalyzed reactions
7. Researchers at IRB Barcelona produce more data on key genes in diabetes
8. Pitt researchers use fluorescence to develop method for detecting mercury in fish
9. Caltech researchers get first 3-D glimpse of bacterial cell-wall architecture
10. Mayo researchers identify dangerous two-faced protein crucial to breast cancer spread and growth
11. Researchers find link between nicotine addiction and autism
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
'Gray's Paradox' solved: Researchers discover secret of speedy dolphins
(Date:12/5/2014)... 4, 2014 Increased emphasis on product ... new testing and inspection technologies. The convergence of ... a range of innovative test solutions. This trend ... Y, which is generally more inclined towards communication, ... development strategies of test equipment vendors will cater ...
(Date:12/3/2014)... Dec. 2, 2014 As part of our ... Technologies is pleased to announce the release of a ... to collect the workforce data that they need. ... been left by existing readers. Many such devices have ... and modern technology. Older models force users to navigate ...
(Date:11/21/2014)... Wash. , Nov. 20, 2014 C-Labs ... for the Internet of Things (IoT), today announced the ... of chief operating officer. Previously a strategic advisor to ... finance, and operations. Mr. Traynor is based out of ... . He reports to Chris Muench , Chief ...
Breaking Biology News(10 mins):Emerging Technologies Enable Smarter Monitoring of Assets, Push Industrial Testing, Inspection and Monitoring Market 2Emerging Technologies Enable Smarter Monitoring of Assets, Push Industrial Testing, Inspection and Monitoring Market 3Emerging Technologies Enable Smarter Monitoring of Assets, Push Industrial Testing, Inspection and Monitoring Market 4Inception Technologies to Release New Biometric Reader 2C-Labs Names Former Microsoft and Bsquare Executive as Chief Operating Officer 2
... attaining a reliable water supply for California and ... realized until better planning can identify how trade-offs ... water is limited, says a new report from ... been ineffective in meeting these goals because management ...
... Research led by Lauren Cole, a public health graduate ... Health and Director of the Epidemiology Program at LSU ... of head and neck cancer has risen at sites ... greatest increase among middle-aged white men. At the same ...
... An international team of researchers led by the University ... discovery of a breast cancer risk gene and could assist ... Melissa Southey of the Genetic Epidemiology Laboratory, Department of Pathology ... it was a significant discovery and the first breast cancer ...
Cached Biology News:Increasing water scarcity in California's Bay-Delta will necessitate trade-offs; 'hard decisions' needed to balance various environmental risks 2Increasing water scarcity in California's Bay-Delta will necessitate trade-offs; 'hard decisions' needed to balance various environmental risks 3Increasing water scarcity in California's Bay-Delta will necessitate trade-offs; 'hard decisions' needed to balance various environmental risks 4LSUHSC research finds HPV-related head & neck cancers rising, highest in middle-aged white men 2Breast cancer risk gene discovery fast tracked by new technology 2
(Date:12/19/2014)... MA (PRWEB) December 19, 2014 Charm ... MRLAFMQ test for the Detection of Aflatoxin M1 in ... to receive independent third party validation. The peer reviewed ... Unit of the Institute for Agricultural and Fisheries Research ... Group. , Aflatoxin B1, the most toxic aflatoxin ...
(Date:12/19/2014)... Mass. , Dec. 19, 2014 Decision ... market will grow at a 12 percent compound annual ... result of the aging population and the increasing adoption ... Latin America will also spur demand for ... of dental implant and periodontal treatments. Other ...
(Date:12/19/2014)... (PRWEB) December 18, 2014 Ed Bilsky, ... of the Center for Excellence in the Neurosciences (CEN), ... England, has been selected as a member of the ... the first neuroscientist from Maine to receive this honor. ... organization supported entirely by the Dana Foundation. Its ...
(Date:12/19/2014)... Diego, CA (PRWEB) December 18, 2014 ... a limited time special on Sartorius Biohit products ... Free on mLINE pipettes, Picus Electronic Pipette Trade-in Program, ... by Health and Safety officers around the world. They ... manual pipetting. Other features include:, ,     Full ...
Breaking Biology Technology:Charm Sciences Achieves Independent Validation of First 15 Minute Quantitative Screening Method for Aflatoxin M1 2Latin American Dental Biomaterial Market Will Expand at a 12 Percent Annual Growth Rate Through 2023 2Latin American Dental Biomaterial Market Will Expand at a 12 Percent Annual Growth Rate Through 2023 3UNE's Ed Bilsky Named Member of Dana Alliance for Brain Initiatives 2UNE's Ed Bilsky Named Member of Dana Alliance for Brain Initiatives 3Major Pipette Distributor Pipette.com Announces Sartorius Year End Specials 2
... P&G,s Commitment to Sustainable Innovation., Accelerates LS9,s Entry into ... ... South San Francisco, CA (PRWEB) -- LS9, Inc., the ... Procter and Gamble (NYSE: PG), one of world,s largest consumer ...
... goBalto.com , ... San Francisco, CA ... partnering site for the pharmaceutical development and drug manufacturing industry, ... of India-based Investigator Sites and hospitals available on goBalto.com. , ...
... Reprints NRx for the Force.com AppExchange saves time for ... process from within Salesforce CRMSANTA MONICA, Calif., May 19 ... announced the availability of Reprints NRx for ... the Force.com platform, Reprints NRx for the AppExchange is ...
Cached Biology Technology:LS9 and Procter & Gamble Launch Sustainable Chemicals Partnership 2goBalto Partners with Maya Clinicals to Expand Its List of Investigator Sites 2goBalto Partners with Maya Clinicals to Expand Its List of Investigator Sites 3Reprints Desk Medical Reprint Service Now Available to Life Science Professionals on the Force.com AppExchange 2Reprints Desk Medical Reprint Service Now Available to Life Science Professionals on the Force.com AppExchange 3
Ms anti-Cyclophilin D...
... to qualitatively detect EGFR ... paraffin-embedded (FFPE) tissue sections, ... cell preparations, using Chromogenic ... Fluorescent In Situ Hybridization ...
Mouse GM CSF Construction Kit provides antigen affinity purified polyclonal capture and tracer antibodies, and antigen standard for development of approximately ten microplate assays....
Many mammalian cell types and experimental situations create challenges for standard transfection experiments. The ViraPower Lentiviral Expression System overcomes these challenges with efficient...
Biology Products: