Mechanical engineers Ken Kiger and Elias Balaras, of the A. James Clark School of Engineering, and entomologist Jeffrey Shultz, College of Chemical and Life Sciences, have identified a biological mechanism in the young mayflies that could enable sensors in stagnant environments to make air or water flow past them so they can detect harmful substances.
Young aquatic mayflies, or “nymphs,” enhance their respiration using gills, creating a flow of fresh water with the help of seven pairs of nearby gill plates that flap like a Venetian blind. The flow of fresh water is generated by the plate’s motion, directing water to the mayfly’s gills as efficiently as possible.
"By duplicating the action of the mayfly gill plates in a tiny robotic device, we hope to create a flow of air or water to sensors in stagnant environments, so they can operate more effectively," Kiger said.
They also are taking a closer look into something that scientists have known for a long time: at a sufficiently small size, an object is less affected by inertia than it is by the thickness (viscosity) of the water it is travelling through.
For example, consider a canoe in comparison to a mayfly. As it travels through the water, the canoe produces a current, which will continue to ripple through the water for some time after the canoe moves on. This is an effect of the water's inertia.
The opposite is true for the tiny mayfly nymph, which is so small that the thickness (viscosity) of the water stops such a current almost as soon as the gill plates stop. Once the mayfly grows to a certain size though, it is capable of creating an inertial effect, or ripples, of its own. Its gills respond accordingly, which is a trait the researchers hope to replicate in their sensors.
"Mayfly sizes are right at the point where issues of viscosity and inertia switch in importance," Kiger said. "Depending on whether the weight or the thickness of the water is influencing its movement, the mayfly switches the way it pumps water to its gills."
The current trend in sensor technology is to strive for smaller and more compact devices to enhance their portability and reduce power consumption. As a result of this trend, traditional technology sensors will run into the same difficulty as experienced by the mayfly as the sensors reach smaller and smaller sizes: eventually a transition will occur where inertial flow mechanisms will become ineffective.
Studying how the mayfly deals with this transition can give us insight into how to better develop equivalent engineered sensors. The next step will be to construct a tiny artificial micro-robot that can reproduce the switchable gill action of the mayfly nymph. Such a mechanism could be installed in sensors intended to detect unhealthy air in otherwise stagnant areas, such as in subway stations or mines.
If a miniature set of robotic mayfly gill plates can move air over a sensor, potentially harmful substances can be detected faster – and no canaries would be harmed in the process. This work is been supported by the National Science Foundation. Entomology graduate student Andrew Sensenig also contributed to this research.
Missy Corley | newswise
Antimicrobial substances identified in Komodo dragon blood
23.02.2017 | American Chemical Society
New Mechanisms of Gene Inactivation may prevent Aging and Cancer
23.02.2017 | Leibniz-Institut für Alternsforschung - Fritz-Lipmann-Institut e.V. (FLI)
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
23.02.2017 | Physics and Astronomy
23.02.2017 | Earth Sciences
23.02.2017 | Life Sciences