Science Literature
Archives for: October 2005, 05
10/05/05
Microscopic artificial swimmers
This is from a Letter to Nature in the October 6, 2005 issue.
Nature 437, 862-865 (6 October 2005)
Microscopic artificial swimmers
Remi Dreyfus, Jean Baudry, Marcus L. Roper, Marc Fermigier, Howard A. Stone and Jerome Bibette
Abstract: Microorganisms such as bacteria and many eukaryotic cells propel themselves with hair-like structures known as flagella, which can exhibit a variety of structures and movement patterns. For example, bacterial flagella are helically shaped and driven at their bases by a reversible rotary engine, which rotates the attached flagellum to give a motion similar to that of a corkscrew. In contrast, eukaryotic cells use flagella that resemble elastic rods and exhibit a beating motion: internally generated stresses give rise to a series of bends that propagate towards the tip. In contrast to this variety of swimming strategies encountered in nature, a controlled swimming motion of artificial micrometre-sized structures has not yet been realized. Here we show that a linear chain of colloidal magnetic particles linked by DNA and attached to a red blood cell can act as a flexible artificial flagellum. The filament aligns with an external uniform magnetic field and is readily actuated by oscillating a transverse field. We find that the actuation induces a beating pattern that propels the structure, and that the external fields can be adjusted to control the velocity and the direction of motion.
Science Literature
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| << < | > >> | |||||
| 1 | 2 | |||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| 31 | ||||||
Search
Categories
Archives
- May 2012 (3)
- April 2012 (3)
- March 2012 (3)
- January 2012 (2)
- December 2011 (4)
- November 2011 (3)
- October 2011 (5)
- September 2011 (3)
- August 2011 (3)
- July 2011 (6)
- June 2011 (3)
- May 2011 (4)
- more...
Linkblog
Links - Groups and Organizations
- Access Research Network
- Discovery Institute
- Evolution News Blog
Evolution has become a favorite topic of the news media recently, but for some reason, they never seem to get the story straight. The staff at Discovery Institute's Center for Science and Culture started this Blog to set the record straight and make sure you knew "the rest of the story".
- Intelligent Design Network (IDNet)
- Intelligent Design Undergraduate Research Center
- Intelligent Reasoning
A blogger from New England offers his intelligent reasoning.
- International Society for Complexity, Information, and Design (ISCID)
- Telic Thoughts
We are a group of individuals, coming from diverse backgrounds and not speaking for any organization, who have found common ground around teleological concepts, including intelligent design. We think these concepts have real potential to generate insights about our reality that are being drowned out by political advocacy from both sides. We hope this blog will provide a small voice that helps rectify this situation.
- The Design Inference - The Writings of William A. Dembski
- The Intelligent Design and Evolution Awareness Center (IDEA)
- www.themonkeytrial.com
Website dedicated to comparing scenes from the "Inherit the Wind" movie with factual information from actual Scopes Trial. View 37 clips from the movie and decide for yourself if this movie is more fact or fiction.
Links - Of General Interest
- A Brief View of Time and Those That Live There
Don Cicchetti blogs on: Culture, Music, Faith, Intelligent Design, Guitar, Audio
- A Quick Guide to Sequenced Genomes
- ARN Related Web Links
- Creation/Evolution Quotes
Australian biologist Stephen E. Jones maintains one of the best origins "quote" databases around. He is meticulous about accuracy and working from original sources.
- CreationEvolutionDesign
Most guys going through midlife crisis buy a convertible. Austrialian Stephen E. Jones went back to college to get a biology degree and is now a proponent of ID and common ancestry.
- Darwinian Fairytales by David Stove
Complete zipped downloadable pdf copy of David Stove's devastating, and yet hard-to-find, critique of neo-Darwinism entitled "Darwinian Fairytales"
- ID The Future
Intelligent Design The Future is a multiple contributor weblog whose participants include the nation's leading design scientists and theorists: biochemist Michael Behe, mathematician William Dembski, astronomer Guillermo Gonzalez, philosophers of science Stephen Meyer, and Jay Richards, philosopher of biology Paul Nelson, molecular biologist Jonathan Wells, and science writer Jonathan Witt. Posts will focus primarily on the intellectual issues at stake in the debate over intelligent design, rather than its implications for education or public policy.
- John Mark Reynolds Blog
A Philosopher's Journey: Political and cultural reflections of John Mark N. Reynolds. Dr. Reynolds is Director of the Torrey Honors Institute at
Biola University.
- NASA Astronomy Picture of the Day
Misc
Syndicate this blog 
What is RSS?
powered by
Original template design by François PLANQUE.
