Obstacles No Barrier to Higher Speeds for Worms

Their findings, which appear in the Journal of the Royal Society Interface, have implications for a better understanding of basic locomotion strategies found in biology, and the survival and propagation of the parasite that causes malaria.

Nematodes, which are very small worms, and many other organisms use a snake-like, undulatory motion to propel forward across dry surfaces and through fluids. There are, however, many instances where small organisms must make their way through a fluid-filled environment studded with obstacles that are comparable in size to the swimmers themselves. Nearly all microscopic nematodes, about one millimeter in length, face such barriers when moving through wet soil—the soil’s granules serve as hurdles these creatures must navigate. Similarly, the malaria parasite’s male gametes, or reproductive cells, must swim through a dense suspension of their host's blood cells in order to procreate. A similar situation arises for spermatozoa moving through the reproductive tract.

In the Journal of the Royal Society Interface study, the Applied Math Lab (AML) group sought to understand how efficiently such undulating organisms can move through obstacle-laden fluids. To do so, they conducted a study comparing experiments using live worms, the nematode C. elegans, with the results of a computer model of a worm moving in a virtual environment. In the experiment, the worms swam through a very shallow pool filled with a lattice of obstructing micro-pillars while the computer simulation gave a benchmark of a worm moving blindly without sensing and response.

Surprisingly, C. elegans was able to advance much more quickly through the lattice of obstacles than through a fluid in which their movement was unimpeded.

“If the lattice is neither too tight nor too loose, the worms move much faster by threading between and pushing off the pillars,” the researchers wrote.

The second surprise was that the computer simulation gave very similar results, reproducing the fast motions of the worm in the lattice, but also showing complex “life-like” behaviors that had been interpreted as coming from sensing and response of the worm to its local environment.

These results enhance our understanding of biological locomotion through tortuous environments like soils or the reproductive tract, showing how real organisms can take advantage of what seems a defiant complexity, and offer intriguing insights into how the reproductive processes of dangerous parasites might be interrupted.

The study’s co-authors were: Trushant Majmudar, a post-doctoral fellow; Eric Keaveny, a former post-doctoral fellow who is now a lecturer at Imperial College London; Professor Jun Zhang; and Professor Michael Shelley.

The study was funded by grants from the National Science Foundation.

Media Contact

James Devitt Newswise Science News

More Information:

http://www.nyu.edu

All latest news from the category: Life Sciences and Chemistry

Articles and reports from the Life Sciences and chemistry area deal with applied and basic research into modern biology, chemistry and human medicine.

Valuable information can be found on a range of life sciences fields including bacteriology, biochemistry, bionics, bioinformatics, biophysics, biotechnology, genetics, geobotany, human biology, marine biology, microbiology, molecular biology, cellular biology, zoology, bioinorganic chemistry, microchemistry and environmental chemistry.

Back to home

Comments (0)

Write a comment

Newest articles

Lighting up the future

New multidisciplinary research from the University of St Andrews could lead to more efficient televisions, computer screens and lighting. Researchers at the Organic Semiconductor Centre in the School of Physics and…

Researchers crack sugarcane’s complex genetic code

Sweet success: Scientists created a highly accurate reference genome for one of the most important modern crops and found a rare example of how genes confer disease resistance in plants….

Evolution of the most powerful ocean current on Earth

The Antarctic Circumpolar Current plays an important part in global overturning circulation, the exchange of heat and CO2 between the ocean and atmosphere, and the stability of Antarctica’s ice sheets….

Partners & Sponsors