Navigation Links
Penn researcher helps identify 'superfast' muscles responsible for bat echolocation
Date:9/29/2011

t the muscles that control this behavior must be pretty fast, but there was no understanding of how they worked," Mead said. "Research on superfast muscles is just a world apart from what they do. This study represents many worlds coming together: the muscle world, that bio-acoustics and echolocation world and the bat behavioral world."

The researchers tested the performance of the bats' vocal muscles by attaching one between a motor and a force sensor and electrically stimulating it to flex. When the motor was stationary, a single electric pulse allowed the researchers to measure the time that bat muscle took to twitch, or to contract and relax.

"The twitch gives us a sense of the time it takes for a muscle cell to go though all the steps, all the chemical reactions, necessary exert force and to relax again," Mead said. "The faster the muscle, the shorter the twitch. These muscles could go through all the motions in less than a hundredth of a second."

To approximate how much work the muscle was doing within the bat, however, the researchers had to change the length of the muscle while it was contracting. When the motor was on, it lengthened and shortened the muscle at a controllable rate. While the muscle was being stretched, the researchers stimulated the muscle to contract, so they could see if the muscle pulled on the motor harder than the motor pulled on the muscle.

The test to see if the muscle was truly of the superfast type involved increasing the speed of the motor to more than a 100 oscillations per second.

"You're always limited to how many twitches you can do in a given period of time," Mead said. "If you keep on increasing the frequency, doing twitch after twitch, you get to the point where the twitches begin to build on top of each other and the muscle doesn't fully turn off. We went to the highest cycling frequency where we still had evidence that the muscle was turning on and off. "

The research
'/>"/>

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

Page: 1 2 3

Related medicine news :

1. Researchers map all the fragile sites of the yeast Saccharomyces cerevisiaes genome
2. UH Case Medical Center researchers publish promising findings for advanced cervical cancer
3. Researchers discover new way to kill pediatric brain tumors
4. Researchers Who Discovered First Genes for Stuttering will Present Findings to the National Stuttering Association
5. Tiny fruit fly could offer big clues in fight against obesity, researcher says
6. Researchers create drug to keep tumor growth switched off
7. MSU researcher linking breast cancer patients with alternative therapies
8. UT researcher receives $2.4 million to research obesity, high-risk pregnancy
9. Urine protein test might help diagnose kidney damage from lupus, UT Southwestern researchers find
10. GUMC researchers say flower power may reduce resistance to breast cancer drug tamoxifen
11. Clemson researchers develop hands-free texting application
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/28/2015)... (PRWEB) , ... August 28, 2015 , ... ... abuse, or those who might personally be struggling with chemical dependency, may be ... from Best Drug Rehabilitation, a results-driven holistic treatment center for addiction located in ...
(Date:8/28/2015)... ... 28, 2015 , ... Drugs and alcohol abuse by employees ... new approach on solutions in his new book ":Unraveling The Psychological Mystery of ... together for meaningful group meetings. "This would educate the employees on not ...
(Date:8/28/2015)... ... August 28, 2015 , ... Dr. Gregory K. Toumayan, D.C., Q.M.E., is now ... shoulder pain, hip pain, neck pain, stiffness, muscle spasms, and numbness. ... of Illinois, and then went on to earn his title of Doctor of Chiropractic ...
(Date:8/28/2015)... ... August 28, 2015 , ... Mendon, IL, home of the Adams County Fairgrounds, ... all for a good cause. In its second year, the “Music With A Mission” ... Drug Rehabilitation. The “Mission” of “Music With A Mission” is to raise money to ...
(Date:8/28/2015)... ... 28, 2015 , ... The newest therapy to receive orphan drug status for ... time soon, according to educational website Surviving Mesothelioma. Click here to read their ... for mesothelioma last week from the FDA, will now head into Phase I clinical ...
Breaking Medicine News(10 mins):Health News:Best Drug Rehabilitation Releases New Video Outlining Patients' Personal Recovery Stories 2Health News:Best Drug Rehabilitation Releases New Video Outlining Patients' Personal Recovery Stories 3Health News:Healthpointe Welcomes Dr. Gregory K. Toumayan, Chiropractor, to Colton, Temecula, and Perris 2Health News:Healthpointe Welcomes Dr. Gregory K. Toumayan, Chiropractor, to Colton, Temecula, and Perris 3Health News:Best Drug Rehabilitation Sponsors "Music With A Mission" Concert Featuring Avenue Beat 2Health News:Surviving Mesothelioma Puts New Orphan Drug into Perspective in New Article 2
... Dec. 1 MassMutual Retirement Services Division has added ... Nonprofit activity has more than tripled in 2008 compared ... Dan Darby joined MassMutual on December 1 ... reports to M. Palmer Whitney, national managing director, nonprofit ...
... 1 The Food Allergy & Anaphylaxis Network (FAAN) ... CEO, replacing Founder Anne Munoz-Furlong, who is retiring. , ... to FAAN extensive knowledge of anaphylaxis, a severe, potentially ... Senior Director of Marketing, she led the marketing team ...
... supplements can also trigger acute organ failure, study says ... the single largest class of drugs that cause idiosyncratic ... accounts for about 13 percent of cases of acute ... most common cause of death from acute liver failure. ...
... Dry-needling, steroids effective against plantar fasciitis, researchers say ... researchers say they,ve developed a fast, effective, non-invasive ... plantar fasciitis. , Using a combination of "dry-needling" ... say their approach achieved a 95 percent success ...
... as one in five of all Americans who survive a ... emotionally paralyzed survivors of 9/11 and broken up survivors, families. ... lower the chance of developing the disorder, but thanks to ... PTSD may be just around the corner. , Prof. Joseph ...
... will die of AIDS. In fact, nearly 7,000 people die each day ... 1 is World AIDS Day, a day of awareness and outreach to help ... Day 2008 is You Can Make a Difference and ... as well as helping dispel the myths and misconceptions about HIV. , ...
Cached Medicine News:Health News:MassMutual Retirement Services Adds Two to Nonprofit Sales Team 2Health News:MassMutual Retirement Services Adds Two to Nonprofit Sales Team 3Health News:FAAN Names New CEO 2Health News:Antibiotics Largest Cause of Drug-Induced Liver Damage 2Health News:New Twist on Treatment of Foot Pain 2Health News:New Twist on Treatment of Foot Pain 3Health News:Easing the stress of trauma 2Health News:In Support of World AIDS Day, FHSSA Announces New Partnerships That Include the First In-Country Partnerships in Namibia and The Gambia 2
(Date:8/28/2015)... , Aug. 28, 2015 ... announced the addition of the "Investigation Report ... their offering. Developed by AstraZeneca plc, ... an important drug for the treatment of schizophrenia. ... quetiapine was listed in the Catalogue of Drugs ...
(Date:8/28/2015)... , Aug. 28, 2015 ... announced the addition of the "Investigation Report ... their offering. Developed by Pharmacia & ... receptor agonist which effectively reduces intraocular pressure. As ... latanoprost (under the trade name of Xalatan) entered ...
(Date:8/28/2015)... , August 28, 2015 The scientific ... collaboration with one of the leading academics in the field ... world record holder in life extension for model animals - ... biology of aging and age-related diseases, primarily, around the stability ... has just been published as "Stability analysis of a model ...
Breaking Medicine Technology:China Quetiapine Market Investigation Report 2010-2019 2China Latanoprost Market Investigation Report 2015-2019 2Gero: Physics Meets Biology to Help Defeat Aging 2Gero: Physics Meets Biology to Help Defeat Aging 3
... PARIS and NEW DELHI, India, Sept. 20 ... subsidiary of Cellectis (Alternext: ALCLS), and Helix BioService ... that they will join forces for the promotion ... India. Helix Biocon is a young company comprised ...
... A unit of the Government of Ukraine today ... a U.S. company that is alleged to be part ... vaccines and other pharmaceuticals.  The case was brought by ... procurement and storage of medicines and medical supplies for ...
Cached Medicine Technology:Cellectis bioresearch and Helix Biocon Join Forces for the Promotion of cGPS® and cGPS® Custom Kits and Cell Line Engineering Services in India 2Cellectis bioresearch and Helix Biocon Join Forces for the Promotion of cGPS® and cGPS® Custom Kits and Cell Line Engineering Services in India 3Ukrainian Government Unit Sues in U.S. - Alleges Corrupt Scheme in Vaccine Purchases 2
... Compact Sigma is designed to easily ... precise mechanical coupling eliminates clumsy time ... performed as well. Dorniers patented isocentric ... ,Positioning is simple using the Dornier ...
Used for temporary control of male urinary incontinence due to surgery or neurogenic disorder. Supplied non-sterile. Reusable. Intended for single patient use only....
... ideally suited for high volume stone centers. This ... and an advanced urological table. With the Dornier ... provides successful treatments for a full range of ... URS and PCN procedures are easy. One of ...
Used for male external catheterization due to urinary incontinence. The inflatable retention ring secures the catheter and can be easily deflated for removal. Supplied non-sterile. Reusable. Intended...
Medicine Products: