Navigation Links
Frogs' amazing leaps due to springy tendons
Date:11/16/2011

PROVIDENCE, R.I. [Brown University] Some species of frogs and many other animals are able to jump far beyond what appear to be their capabilities. The trained contestants in the frog-jumping competition in Calaveras County, Calif., come to mind, but even ordinary frogs can leap several times farther than their physiology would seem to allow.

"Muscles alone couldn't produce jumps that good," said Henry Astley, who studies the biomechanics of frog jumping at Brown University.

In a paper published in Biology Letters, Astley and Thomas Roberts, associate professor of biology, show that the key to frogs' leaping lies in their stretchy tendons: Before jumping, the leg muscle shortens, loading energy into the tendon, which then recoils like a spring to propel the frog up, up and away. Even though as much as a quarter of a frog's body mass is in its legs, it would be physically incapable of jumping as far without the tendon's services.

"In order to get truly exceptional jumping performance, you need some sort of elastic structure," said Astley, a fourth-year graduate student in Roberts's lab in the Department of Ecology and Evolutionary Biology.

Astley and Roberts examined jumps by the northern leopard frog (Rana pipiens), a pond frog common in the northeast United States. The pair implanted metal beads into the shin bone, ankle bone and leg muscle of four frogs and then recorded their leaps with 3-D X-ray video technology developed at Brown. The video, filmed at 500 frames per second and displaying the jump about 17 times slower than normal, tracks the changes in the leg muscle's length and joint movement before, during and after a jump.

As the frog readies itself to leap, its calf muscle shortens. After about 100 milliseconds, the calf muscle stops moving, and the energy has been fully loaded into the stretched tendon. At the moment the frog jumps, the tendon, which wraps around the ankle bone, releases its energ
'/>"/>

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

Page: 1 2

Related biology news :

1. Tree frogs chill out to collect precious water
2. Fitness tests for frogs?
3. Inventions of evolution: What gives frogs a face
4. New sensor derived from frogs may help fight bacteria and save wildlife
5. Frogs evolution tracks rise of Himalayas and rearrangement of Southeast Asia
6. Research of cell movements in developing frogs reveals new twists in human genetic disease
7. Primitive frogs do a belly flop
8. Prehistoric frogs face extinction
9. Counting frogs: Why monitoring our amphibian populations is important
10. Frogs, foam and fuel: University of Cincinnati researchers convert solar energy to sugars
11. Pesticide atrazine can turn male frogs into females
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Frogs' amazing leaps due to springy tendons
(Date:9/1/2014)... decisions of the Nomenclature Section of the XVIII International ... 2011. This meeting is held every six years and ... rules for naming algae, fungi and plants get together ... the organisms they study. This is the primary product ... algae, fungi, and plants, which was published in 2012. ...
(Date:8/31/2014)... fast and accurate tool to diagnose tuberculosis in ... developed test (TAM-TB assay) is the first reliable ... The test features excellent specificity, a similar sensitivity ... a blood test. The promising findings are a ... children, particularly in tuberculosis-endemic regions. , The study ...
(Date:8/31/2014)... of the greatest challenges in modern medicine is developing ... with minimal toxicity and side-effects to the patient. Such ... the drug molecule. Ideally, the drug should have a ... so that it binds it with high specificity. Publishing ... a synthetic amino acid that can impact the 3D ...
Breaking Biology News(10 mins):Week-long meeting on naming algae, fungi, and plants recorded for posterity 2New tuberculosis blood test in children is reliable and highly specific 2A new synthetic amino acid for an emerging class of drugs 2A new synthetic amino acid for an emerging class of drugs 3
... WORCESTER, Mass. Orthopedic surgeons are often hamstrung ... bone injuries resulting from trauma, aging or cancer. Conventional ... or brittle ceramics, and cannot readily conform to the ... in addition, they often require metallic fixation devices that ...
... Swiss needle cast epidemic in Douglas-fir forests of the coastal ... over at least the past 100 years, and is probably ... and a warmer climate, new research concludes. Scientists in ... found that this disease, which is affecting hundreds of thousands ...
... the University of Alabama at Birmingham (UAB) have been ... Scholarship and Excellence in Education Foundation. Atbin Doroodchi, ... Biology and Mathematics. He has a 3.95 grade-point average ... Honors Program. Doroodchi is an undergraduate researcher in the ...
Cached Biology News:Smart orthopedic implants and self-fitting tissue scaffolding created by UMMS researchers 2Forest epidemic is unprecedented phenomenon, still getting worse 2Forest epidemic is unprecedented phenomenon, still getting worse 3Forest epidemic is unprecedented phenomenon, still getting worse 43 UAB students awarded prestigious Goldwater scholarships 2
(Date:9/2/2014)... 2014  Xencor, Inc. (NASDAQ: XNCR ... antibodies for the treatment of autoimmune diseases, asthma ... appointment of Debra Zack , M.D., Ph.D., ... Lloyd Rowland , senior vice president, chief ... "Debra,s expertise in biologics clinical development and medical ...
(Date:9/2/2014)... Winston-Salem, NC and Rocky Mount, NC (PRWEB) September 02, ... (PMG) announced today the establishment of its 11th clinical ... 1, PMG Research has assumed ownership and operation of ... in Rocky Mount, NC, further expanding PMG’s presence in ... to an additional 130,000 patients. For the patients in ...
(Date:9/1/2014)... 1, 2014 Reportlinker.com announces that a ... catalogue: India Solid Waste Management Vehicles ... http://www.reportlinker.com/p02350445/India-Solid-Waste-Management-Vehicles-Market-Forecast-and-Opportunities-2019.html In ... governing bodies responsible for complete handling and regulation ... average, around 135,000 MT solid waste is generated ...
(Date:8/31/2014)... Available spectra is similar for all L-series products ... a wide range of plants. The spectra is ... and pending wide spectrum technology. The single chip ... in contrast to growth spectra made from monochromatic ... large variety of differently sized and shaped growing ...
Breaking Biology Technology:Xencor Appoints Debra Zack, M.D., Ph.D., Vice President, Clinical Development and Lloyd Rowland, Senior Vice President, Chief Compliance Officer and General Counsel 2Xencor Appoints Debra Zack, M.D., Ph.D., Vice President, Clinical Development and Lloyd Rowland, Senior Vice President, Chief Compliance Officer and General Counsel 3PMG Research Announces the Formation of its Eleventh Site 2PMG Research Announces the Formation of its Eleventh Site 3India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 2India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 3India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 4India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 5India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 6India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 7India Solid Waste Management Vehicles Market Forecast and Opportunities, 2019 8
... 3 Ikaria Holdings, Inc., a fully,integrated critical ... CEO, David Shaw, will present at the 26th ... at 3:00 p.m., PST. The,conference will be held ... in San,Francisco., About Ikaria Holdings, Inc., ...
... than 500,000 Total Prescriptions Have Been Dispensed for ... ... 3 Shire plc (LSE: SHP,Nasdaq: SHPGY, TSX: SHQ), the ... from the U.S. Food and Drug,Administration (FDA) for three additional ...
... Jan. 3 Neogen Corporation,(Nasdaq: NEOG ) announced ... FY 2008, which ended Nov. 30, increased 34% from ... split, net income in the,quarter rose to $0.22 per ... net income of $3,254,000 set another quarterly,record for the ...
Cached Biology Technology:FDA Approves Additional Dosage Strengths of Shire's ADHD Treatment VYVANSE(TM) (lisdexamfetamine dimesylate) Which May Help Physicians Tailor Treatment for Individual Patients 2FDA Approves Additional Dosage Strengths of Shire's ADHD Treatment VYVANSE(TM) (lisdexamfetamine dimesylate) Which May Help Physicians Tailor Treatment for Individual Patients 3FDA Approves Additional Dosage Strengths of Shire's ADHD Treatment VYVANSE(TM) (lisdexamfetamine dimesylate) Which May Help Physicians Tailor Treatment for Individual Patients 4FDA Approves Additional Dosage Strengths of Shire's ADHD Treatment VYVANSE(TM) (lisdexamfetamine dimesylate) Which May Help Physicians Tailor Treatment for Individual Patients 5Neogen Reports 34% Increase in Net Income, 23% Increase in Revenues 2Neogen Reports 34% Increase in Net Income, 23% Increase in Revenues 3Neogen Reports 34% Increase in Net Income, 23% Increase in Revenues 4Neogen Reports 34% Increase in Net Income, 23% Increase in Revenues 5
... Clone/PAD: ZMD.358. Immunogen: Synthetic ... region of human mouse and ... with human and mouse LRP5 ... (positive controls: mouse LRP5-pSEC-tag-transfected 293T ...
MarrowMAX Bone Marrow Medium...
... recognizes murine IRF7 protein, and ... related IRF proteins. Reactivity of ... protein was confirmed by western ... cells transfected with IRF7. Reactivity ...
Rabbit anti-phospho-EGFr (Tyr992) - Concentrate...
Biology Products: