HOME >> BIOLOGY >> NEWS
Bone strength probed by scientists

(Santa Barbara, Calif.) The December 13 issue of the journal Nature reports on unique properties of bone revealed in experiments, by scientists at the University of California, Santa Barbara, with the atomic force microscope (AFM).

Collagen, the most abundant protein in the human body serving as a structural component of a variety of tissues including bone, tendon and skin reveals special properties which allow it to "bounce back" when pulled or stressed in laboratory experiments. The AFM operates by tapping and pulling with a tiny needle.

"We learned that the collagen in bone contains sacrificial bonds that rupture as collagen is stretched, and then they reform or heal," said James B. Thompson, first author and a graduate student at UC Santa Barbara.

"These sacrificial bonds provide a mechanism for dissipating mechanical energy in collagen molecules. The time scale required for sacrificial bonds to reform in collagen correlates to the time needed for bone to recover from microscopic indentations."

Besides stretching the collagen from bones, the scientists made small indentations in bone, and like foam rubber that is pressed down, discovered that the bone returns to its original shape. They found that this takes a stiffer force probe, or more force, to indent a bone than to stretch a collagen molecule.

"The surface can recover back to its original shape," said Thompson. "It takes about 30 seconds."

Like the sacrificial bonds in the very tough abalone shell, which has also been studied extensively in the lab of Paul K. Hansma, professor of physics, "these sacrificial bonds found within or between collagen molecules may be partially responsible for the toughness of bone," according to the article.

The article also states that "The longer the delay before the next pull, the more energy dissipation observed when pulling the collagen molecule(s) again."

For the stretch experiments the group used purified cow tendon, and
'"/>

Contact: Gail Brown
gail.brown@ia.ucsb.edu
805-893-7220
University of California - Santa Barbara
13-Dec-2001


Page: 1 2

Related biology news :

1. Invention could improve PVC safety and strengthen $1.8-billion industry worldwide
2. Grant from GE Foundation to University of Houston to strengthen math, tech pipeline
3. Researchers reveal calcium transport protein function that regulates heartbeat frequency, strength
4. Tufts University bioengineers discover secret of spider, silkworm fiber strength
5. Swimming can contribute to rebuilding bone strength
6. Grant strengthens research arm of Penn State Hershey Medical Centers ALS Clinic
7. Hebrew University excavations strengthen dating of archaeological findings to David, Solomon
8. Study says: whey to greater muscle strength is through training and protein supplements
9. New NSF institutes to strengthen mathematics as base for national S&T
10. Studies of spiders silk reveal unusual strength
11. Studying the strength of protein bonds one molecule at a time

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Bone strength probed scientists

(Date:7/30/2014)... Scientists studying the potential effects of climate change ... focusing on the wrong factors, according to a ... Wildlife Conservation Society, University of Queensland, and other ... conservation science is missing the point when it ... majority of climate change scientists focus on the ...
(Date:7/30/2014)... points is a straight line, and now Harvard researchers ... axiom to heart. , Though competition among individual ... racing for the chance to fertilize the egg, Harvard ... that allow them to take a straighter path to ... Heidi Fisher, a post-doctoral student working in the lab ...
(Date:7/30/2014)... Governing Board of the Entomological Society of America (ESA) ... 2014. The election as a Fellow acknowledges outstanding contributions ... research, teaching, extension, or administration. The following Fellows will ... Meeting -- which will be held November 16-19, 2014 ... is a professor with the Department of Plant, ...
Breaking Biology News(10 mins):Conservation scientists asking wrong questions on climate change impacts on wildlife 2When cooperation counts 2When cooperation counts 3Entomological Society of America recognizes 2014 fellows 2Entomological Society of America recognizes 2014 fellows 3Entomological Society of America recognizes 2014 fellows 4Entomological Society of America recognizes 2014 fellows 5Entomological Society of America recognizes 2014 fellows 6Entomological Society of America recognizes 2014 fellows 7Entomological Society of America recognizes 2014 fellows 8Entomological Society of America recognizes 2014 fellows 9Entomological Society of America recognizes 2014 fellows 10Entomological Society of America recognizes 2014 fellows 11Entomological Society of America recognizes 2014 fellows 12Entomological Society of America recognizes 2014 fellows 13Entomological Society of America recognizes 2014 fellows 14Entomological Society of America recognizes 2014 fellows 15Entomological Society of America recognizes 2014 fellows 16Entomological Society of America recognizes 2014 fellows 17
(Date:7/30/2014)... Columbia, MD (PRWEB) July 30, 2014 ... announces today the release of the REVELERIS® ... allows organic chemists, preparative chromatographers, and other researchers ... (LC) using a single unit. , With the ... between flash and preparative chromatography modes with a ...
(Date:7/30/2014)... 30, 2014  Decision Resources Group finds that ... in the United States ... penetration will be the level of savings achievable ... expected lower cost to patients. Payers plan to ... their pricing expectations in order to encourage physician ...
(Date:7/30/2014)... SAN FRANCISCO , July 30, 2014 /PRNewswire/ ... Transplant Congress evaluated the safety and efficacy of ... antibody-mediated rejection following kidney transplants in highly sensitized ... important inhibitor of the complement system. ... results in significant increases in the levels of ...
(Date:7/30/2014)... 2014  The Chicago Bears are excited to announce ... (Academy) in an effort to raise awareness of skin ... free SPOT me™ skin cancer screenings at a preseason ... SPOT me™ is an educational campaign designed to ... risks of skin cancer, and encourages people to get ...
Breaking Biology Technology:Grace Launches New REVELERIS® Prep Purification System 2Surveyed U.S. Payers Expect Cost Savings to MCOs and Patients to be the Strongest Drivers of Biosimilar Uptake 2Surveyed U.S. Payers Expect Cost Savings to MCOs and Patients to be the Strongest Drivers of Biosimilar Uptake 3Study Suggests C1-INH May Aid in Prevention of Antibody-Mediated Rejection Following Kidney Transplant 2Study Suggests C1-INH May Aid in Prevention of Antibody-Mediated Rejection Following Kidney Transplant 3Chicago Bears Join the American Academy of Dermatology in Fight against Skin Cancer 2Chicago Bears Join the American Academy of Dermatology in Fight against Skin Cancer 3Chicago Bears Join the American Academy of Dermatology in Fight against Skin Cancer 4
Cached News: