A water-dwelling rotifer (Brachionas calyciflorus) is surrounded by algae (Chlorella vulgaris) it hopes to eat by waving its cilia, at top, and drawing them into its mouth. In fresh water, these rotifers are barely visible as white specks while the microscopic algae are 100 times smaller. T.Yoshida and R.O. Wayne/Cornell University.
Glass chemostats like these, filled with water, nutrients, predators and prey - were used to demonstrate rapid evolution in a matter of weeks by Cornell biologists, including, from left, Nelson Hairston Jr., Stephen Ellner and Gregor Fussmann. Cornell University Photography Copyright © Cornell University
In the fishbowl of life, when hordes of well-fed predators drive their prey to the brink of extinction, sometimes evolution takes the fast track to help the hunted survive -- and then thrive to outnumber their predators.
This rapid evolution, predicted by Cornell University biologists in computer models and demonstrated with Pac-Man-like creatures and their algae food in laboratory habitats called chemostats, could play an important role in the ecological dynamics of many predator-prey systems, according to an article in the latest issue (July 17, 2003) of the journal Nature .
Physicians, the Cornell biologists say, should keep this rapid evolution in mind when investigating interactions between diseases and victims. As one example, they say, it is useful in trying to understand how HIV, the AIDS virus, manages to evolve so swiftly that development of improved vaccines is extremely difficult.
Roger Segelken | Cornell University News Service
Observing changes in the chirality of molecules in real time
14.11.2019 | ETH Zurich
Pinpointing Pollutants from Space
14.11.2019 | Max-Planck-Institut für Chemie
The Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM in Dresden has succeeded in using Selective Electron Beam Melting (SEBM) to...
Carbon nanotubes (CNTs) are valuable for a wide variety of applications. Made of graphene sheets rolled into tubes 10,000 times smaller than a human hair, CNTs have an exceptional strength-to-mass ratio and excellent thermal and electrical properties. These features make them ideal for a range of applications, including supercapacitors, interconnects, adhesives, particle trapping and structural color.
New research reveals even more potential for CNTs: as a coating, they can both repel and hold water in place, a useful property for applications like printing,...
If you've ever tried to put several really strong, small cube magnets right next to each other on a magnetic board, you'll know that you just can't do it. What happens is that the magnets always arrange themselves in a column sticking out vertically from the magnetic board. Moreover, it's almost impossible to join several rows of these magnets together to form a flat surface. That's because magnets are dipolar. Equal poles repel each other, with the north pole of one magnet always attaching itself to the south pole of another and vice versa. This explains why they form a column with all the magnets aligned the same way.
Now, scientists at ETH Zurich have managed to create magnetic building blocks in the shape of cubes that - for the first time ever - can be joined together to...
Quantum-based communication and computation technologies promise unprecedented applications, such as unconditionally secure communications, ultra-precise...
In two experiments performed at the free-electron laser FLASH in Hamburg a cooperation led by physicists from the Heidelberg Max Planck Institute for Nuclear physics (MPIK) demonstrated strongly-driven nonlinear interaction of ultrashort extreme-ultraviolet (XUV) laser pulses with atoms and ions. The powerful excitation of an electron pair in helium was found to compete with the ultrafast decay, which temporarily may even lead to population inversion. Resonant transitions in doubly charged neon ions were shifted in energy, and observed by XUV-XUV pump-probe transient absorption spectroscopy.
An international team led by physicists from the MPIK reports on new results for efficient two-electron excitations in helium driven by strong and ultrashort...
05.11.2019 | Event News
30.10.2019 | Event News
02.10.2019 | Event News
14.11.2019 | Materials Sciences
14.11.2019 | Health and Medicine
14.11.2019 | Materials Sciences