HOME >> BIOLOGY >> NEWS
Unified physics theory explains animals' running, flying and swimming

e. "It doesn't matter whether the animal has eight legs, four legs, two, even if it swims with no legs."

First conceived by Bejan and published in 1996, the constructal law arises from the basic principle that flow systems evolve so as to minimize imperfections -- energy wasted to friction or other forms of resistance -- such that the least amount of useful energy is lost.

The theory applies to virtually everything that moves, Bejan said. For example, his earlier work has examined how the law explains traffic flows, the cooling of small-scale electronics and river currents.

The researchers, funded by the National Science Foundation, report that the constructal law predicts universal relationships between animals' body mass and speed, as well as the frequency and force of the strides, beats or undulations that propel their bodies forward.

"Running, swimming and flying occur in vastly different physical environments and, likewise, involve quite different body mechanics," Bejan said of the new application of constructal law. "Nonetheless, there are strong convergences in certain functional characteristics of runners, swimmers and fliers."

For example, the stride frequency of running vertebrates bears the same relationship to the animals' mass as does the rate at which fish swim. Similarly, the velocity of runners conforms to the same principles as the speed of birds in flight.

The force generated by the muscular "motors" of runners, swimmers and fliers also conforms with surprisingly little variation to a universal value dependent only on muscle mass, Marden said. Why this relationship should be so had remained mysterious, he said.

In the absence of a unifying theory for such design features, biologists had looked to mechanical constraints for an answer, the researchers said. Many authors have suggested that effects of scale in locomotion stem from biomechanical safety factors: the need to avoid premature failu
'"/>

Contact: Kendall Morgan
kendall.morgan@duke.edu
919-660-8414
Duke University
30-Dec-2005


Page: 1 2 3 4 5

Related biology news :

1. Unraveling the physics of DNAs double helix
2. Pendulum love, science class gender gaps, musical mind mirrors, and unparticle physics
3. Manchester to spearhead 8.3 million particle physics project
4. Press conferences at the years largest physics meeting
5. Largest physics meeting of the year, in Denver
6. Protein folding physics, nanohandles, sunscreen for algae and classical quantum weirdness
7. Technique used commonly in physics finds application in neuroscience
8. What do Racquel Welch and quantum physics have in common?
9. APS physics tip sheet #62
10. Biggest physics meeting of the year
11. APS physics tip sheet #57

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/7/2017)... Feb. 7, 2017   MedNet Solutions , an ... spectrum of clinical research, is pleased to announce that ... its innovative, highly flexible and award winning eClinical solution, ... iMedNet is a proven Software-as-a-Service (SaaS) clinical ... Capture (EDC), but also delivers an entire suite of ...
(Date:2/3/2017)... WASHINGTON , Feb. 3, 2017 A ... Identity Strategy Partners, LLP (IdSP) . Designed to ... in the complex identity market, founding partners Mark ... nearly 35 combined years just in identity expertise that ... tank and non-profit leadership. The Crego-Kephart combined expertise has ...
(Date:1/31/2017)... 2017  Spero Therapeutics, LLC, a biopharmaceutical company ... of bacterial infections, today announced it has acquired ... Pro Bono Bio Ltd (PBB) to bolster its ... forms of Gram-negative bacteria.   The assets acquired have ... PBB group company. "The acquisition of ...
Breaking Biology News(10 mins):
(Date:2/23/2017)... Calif. , Feb. 23, 2017  MIODx ... license for two key immunotherapy technologies from the ... technology provides a method to monitor a patient ... as PD-L1 and CTLA-4.  The second license extends ... a patient is likely to have an immune-related ...
(Date:2/23/2017)... TX (PRWEB) , ... February 23, 2017 , ... ... Administration (FDA) de novo clearance to begin marketing the SPEAC® System, the Brain ... for adults at home or in healthcare facilities during periods of rest. A ...
(Date:2/23/2017)... ... February 23, 2017 , ... The Greater Gift Initiative, Inc , ... Compass Research . GGI's mission is to advance global health and highlight the ... need in honor of each clinical trial volunteer. The vision of GGI is to ...
(Date:2/23/2017)... USA, and CARDIFF, UK (PRWEB) , ... February ... ... international society for optics and photonics , have been named Fellows of the ... significant scientific and technical contributions in the multidisciplinary fields of optics, photonics, and ...
Breaking Biology Technology:
Cached News: