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:12/4/2014)... BEACH GARDENS, Fla. , Dec. 3, 2014 ... management solutions, today announced that its DigitalPersona ® ... 4500 fingerprint readers have been deployed throughout First ... , South Carolina ... headquartered in Southern Pines, North Carolina ...
(Date:11/21/2014)... DALLAS , November 18, 2014 ... Security Systems Market by Systems (Video, RFID, Access Control, ... (SEZ, Factories, Hotels, Banks, Government), Component Service Geography - ... Security Systems Market is projected to be around $25 ... Billion by 2020, growing at a CAGR of 8.69%. ...
(Date:11/21/2014)... -- C-Labs LLC, a leading provider of remote and ... announced the appointment of John Traynor to ... advisor to the firm, Mr. Traynor will now oversee ... out of the C-Labs office in Redmond, ... , Chief Executive Officer. Photo - ...
Breaking Biology News(10 mins):First Bank Partners with Crossmatch to Increase Log In Security 2First Bank Partners with Crossmatch to Increase Log In Security 3Industrial Security Systems Market Worth $38 Billion by 2020 2Industrial Security Systems Market Worth $38 Billion by 2020 3C-Labs Names Former Microsoft and Bsquare Executive as Chief Operating Officer 2
... are very fragile and highly susceptible to ... in ways to increase profits and reduce ... temperature management techniques. Collaborative research from scientists ... the University of Florida contains several findings ...
... wet climate and a lot of different kinds of birds ... the region will also contain numerous kinds of pathogens that ... of human disease, led by Dr. Rob Dunn at North ... social scientists, shows that that one can predict the number ...
... Press Program will feature new study results from the ... of their presentation at ELCC): Making ... with radiation in patients with locally advanced lung cancer: ... for lung cancer in organ transplant recipients, Hyperfractionated radiotherapy ...
Cached Biology News:Hydrocooling shows promise for reducing strawberry weight loss, bruising 2Study pins factors behind geography of human disease 2Study pins factors behind geography of human disease 32nd European Lung Cancer Conference 22nd European Lung Cancer Conference 3
(Date:12/24/2014)... PharmaBoardroom,s new report, , Healthcare and Life ... free download , digs deep into this vibrant market, speaking ... today. One area where Algeria ... homegrown pharmaceutical manufacturing base, even if the government,s ambitious target ... A cursory comparison with neighboring Morocco ...
(Date:12/22/2014)... 22, 2014   Synthetic Biologics, Inc. ... pathogen-specific therapies for serious infections and diseases, ... today announced positive topline safety and tolerability ... of SYN-004, the Company,s investigational oral beta-lactamase ... difficile (C. difficile) infection, antibiotic-associated diarrhea ...
(Date:12/22/2014)... (PRWEB) December 22, 2014 ... peer-reviewed publication of original research, reviews and editorials ... and clinical practice, today published a provocative article ... the development, progression and potential treatment of prostate ... endocrinology research and proposes the possibility that there ...
(Date:12/19/2014)... BioPlus Specialty Pharmacy (BioPlus), one of ... Nick Maroulis, Pharm.D. to the newly created position of ... this position, Dr. Maroulis will continue to manage the ... our multi-site pharmacies as the company expands. Dr. Maroulis ... time he has served in many different capacities in ...
Breaking Biology Technology:PharmaBoardroom Releases New Algeria Pharmaceuticals Report 2PharmaBoardroom Releases New Algeria Pharmaceuticals Report 3Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 2Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 3Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 4Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 5Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 2Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 3Prostate Cancer Experts Dissect the Role of Follicle-stimulating Hormone in the Development, Progression and Potential Treatment of Prostate Cancer 4BioPlus Specialty Pharmacy Promotes Dr. Nick Maroulis to Vice President of Specialty Pharmacy Services 2
... Huifeng Bio-,Pharmaceutical Technology, Inc (OTC Bulletin Board: HFGB), ... pharmaceutical raw materials,for use in pharmaceutical, nutraceutical and ... results second quarter 2008 which,ended June 30 on ... close., Huifeng,s earnings release and related materials ...
... Anacor Pharmaceuticals,announced today that it has appointed Kurt Jarnagin, ... are pleased to welcome Kurt to the company," said ... Pharmaceuticals. "Kurt,is a noted expert in the field of ... enrich our team as we continue to,expand our pipeline ...
... ACEL ) today announced that it received ... notifying the Company that its,securities will be delisted ... NASDAQ notified the Company that the market value ... $35 million required for continued,inclusion on The NASDAQ ...
Cached Biology Technology:Anacor Pharmaceuticals Appoints Dr. Kurt Jarnagin Vice President of Biological Research 2Alfacell Receives NASDAQ Delisting Letter 2Alfacell Receives NASDAQ Delisting Letter 3
...
... Monoclonal Anti-β-Tubulin IV Recognizes an ... sequence of β-tubulin isotype IV. ... isotypes is observed. ascites fluid ... C-terminal sequence of β-tubulin isotype ...
... Finnpipette BioControl is a major step ... complete liquid handling system - with ... tip cone modules. All five single ... modules fit one handle. The lightweight ...
... the joining of two strands of DNA ... of adjacent nucleotides in either a cohesive-ended ... also been shown to catalyze the joining ... RNA strand in a duplex molecule but ...
Biology Products: