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:2/5/2015)... SAN DIEGO , Jan. 26, 2015   Epic ... treatment of cancer, today announced that Murali Prahalad , ... Personalized Medicine World Conference (PMWC) 2015: Silicon Valley, ... Mountain View, Calif. on January 26-28, ... entitled, "CTCs Come of Age as Biomarkers." Last year, Epic ...
(Date:2/5/2015)... 28, 2015 Research and Markets ... the "Global Biometrics Market (2014-2020): Market Forecast ... report to their offering. , ... is anticipated to overtake ... increasing government spending towards IT security, government biometric ...
(Date:1/22/2015)... /PRNewswire/ - Today, FindBiometrics, the leading source of biometrics industry news, ... website design. "When we launched FindBiometrics 12 years ... O,Neill , founder and CEO of FindBiometrics. "Now it,s maturing ... the key players on a very broad scale.  We are ...
Breaking Biology News(10 mins):Epic Sciences to Present at Personalized Medicine World Conference 2015 on the Use of Circulating Tumor Cells as Cancer Biomarkers 2Global Biometrics Market (2014-2020): Market Forecast By Technologies, Applications, End Use, Regions and Countries 2Global Biometrics Market (2014-2020): Market Forecast By Technologies, Applications, End Use, Regions and Countries 3Identity Industry Leading Publication Debuts New Look As Biometrics Hit Mainstream 2
(Date:2/27/2015)... 2015  Steep Hill, the industry leader in cannabis ... to open a full service medical cannabis quality assurance ... bringing advanced scientific tools and methodology to the state, ... is currently the only laboratory licensed by the New ... testing in order to meet the recently adopted regulatory ...
(Date:2/26/2015)... Feb. 26, 2015 /PRNewswire/ - SQI Diagnostics Inc. ("SQI" ... sciences company that develops and commercializes proprietary technologies and ... and operational results for the fiscal first quarter ended ... are in Canadian dollars (CAD), unless otherwise stated. ... win new business from our existing customers and add ...
(Date:2/26/2015)... February 26, 2015 The Movement for ... to support life extension technologies and awareness. The event ... Coordinated Time, on March 21st 2015, in a live ... , Eric Schulke, Founder of MILE, says, “Our lives ... urgency. The Movement for Indefinite Life Extension is raising ...
(Date:2/26/2015)... 2015 The Pittcon 2015 Exposition, ... Ernest N. Morial Convention Center in New Orleans, ... February 19, 2015) displaying products and services used ... government labs. The Exposition will offer the latest ... to, analytical chemistry; drug discovery; nanotechnology; life sciences ...
Breaking Biology Technology:Steep Hill First to Receive Provisional Approval to Establish Laboratory Services for Cannabis Testing in State of New Mexico 2SQI Diagnostics Reports First Quarter Financial Results 2SQI Diagnostics Reports First Quarter Financial Results 3SQI Diagnostics Reports First Quarter Financial Results 4SQI Diagnostics Reports First Quarter Financial Results 5SQI Diagnostics Reports First Quarter Financial Results 6Indefinite Life Extension Activists Organize Online Demonstration 2Indefinite Life Extension Activists Organize Online Demonstration 3Pittcon 2015 Announces Exposition Highlights 2
Cached News: