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:


(Date:1/18/2017)... MedNet Solutions , an innovative ... spectrum of clinical research, is proud to announce ... the organization in terms of corporate growth, outside ... and services. The company,s exceptional achievements can be ... iMedNet ™ – MedNet,s ...
(Date:1/12/2017)... PUNE, India , January 12, 2017 A new report ... 2022," projects that the global biometric technology market is expected to generate revenue of ... Continue Reading ... Allied ...      (Logo: http://photos.prnewswire.com/prnh/20140911/647229) ...
(Date:1/6/2017)... Colo. , Jan. 5, 2017  SomaLogic ... the "Digital Life Alliance" established by iCarbonX, the ... 2015 to build a "Global Digital Health Ecosystem ... on a combination of individual,s biological, behavioral and ... the agreement between the companies, SomaLogic will provide ...
Breaking Biology News(10 mins):
(Date:1/18/2017)... Applied BioMath ( www.appliedbiomath.com ), the ... and development, today announced that Dr. John ... Applied BioMath, will present at the next Boston ... on Thursday January 19, 2017 at the Broad ... Dr. Burke,s talk "Quantitative Modeling and Simulation Approaches: ...
(Date:1/18/2017)... ... January 18, 2017 , ... Total Orthopedics ... implanted SpineFrontier’s A-CIFT™ Solofuse-P™. The operation took place on Wednesday, January 11, 2017 ... procedure was an anterior cervical discectomy and fusion on a 42 year old ...
(Date:1/18/2017)... ... January 18, 2017 , ... MYOLYN, ... that it has submitted a 510(k) to the FDA, requesting clearance of the ... functional electrical stimulation (FES) technology. , The submission marks a major milestone ...
(Date:1/18/2017)... ... 18, 2017 , ... BidMed, LLC, announced it will hold a ... lab equipment from two different leading institutes. This highly specialized laboratory equipment is coming ... States. This 1-day online auction will take place on BidMed’s website http://www.bidmed.com ...
Breaking Biology Technology:
Cached News: