Navigation Links
Magnetic snakes control fluids, gravity-defying droplets, and solving a dragonfly mystery
Date:9/24/2007

ith pushing and pulling. As the plate rises, it pushes the droplet upward, and as it falls, it pulls the droplet down. Inertia would have the droplet slide down as the plate moved upward. Similarly, the droplet would climb up the incline as the plate drops, resisting the rapid downward acceleration.

However, the forces that hold the droplet to the plate are stronger as the plate rises. During the time that the droplet would be moving downhill, it is stuck more firmly to the plate. Therefore, the droplet gains more ground moving up the incline as the plate falls than it loses as the plate rises. Overall, the droplets travel uphill.

If the vibration doesn't apply enough force to the droplet, it will just sit still on the inclined plate. As the force increases, the droplet will begin to slide. Increasing the forces further, the droplet sits still again. Turn up the force on the droplet a little more, and it starts to climb.

Since the droplet must withstand a fair amount of force, alternately pushing and pulling, the fluid has to be somewhat thick or viscous. Pure water droplets will break apart before the forces are strong enough to cause them to climb. On the other end, the drops move very slowly if the fluid is too thick. Nevertheless, this method for moving droplets using vibrations may prove useful in the manipulation of microscopic fluids. -KM

Solving a Dragonfly Flight Mystery
Z. Jane Wang and David Russell
Physical Review Letters (forthcoming)

Dragonflies adjust their wing motion while hovering to conserve energy, according to a Cornell University study of the insect's flight mechanics. The revelation contradicts previous speculation that the change in wing motion served to enhance vertical lift.

The Cornell physicists came to their conclusions after analyzing high speed images of dragonflies in action. The insects have two pairs of wings, which sometimes move up and down in harmony. At oth
'/>"/>

Contact: James Riordon
riordon@aps.org
301-209-3238
American Physical Society
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Overbearing colored light may reveal a second mechanism by which birds interpret magnetic signals
2. Bacteria which sense the Earths magnetic field
3. Magnetic probe successfully tracks implanted cells in cancer patients
4. Magnetic system could be key to surgery without scars
5. Magnetic computer sensors may help study biomolecules
6. Researchers reveal secrets of flying snakes
7. Snakes virtual glasses, leopard spots and all-optical transistors
8. Nonvenomous Asian snakes borrow defensive poison from toxic toads
9. Ancient olfaction protein is shared by many bugs, offering new pest control target
10. Gene variations explain drug dose required to control seizures
11. U-M scientists find genes that control growth of common skin cancer
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/18/2014)... and the Quebec government have discovered microplastics (in ... of Fisheries and Aquatic Sciences . , The ... industrial cleansers, to which they are commonly added ... buoyancy, they may readily pass through sewage treatment ... the world,s oceans, but have only recently been ...
(Date:9/18/2014)... ability to acquire and creatively manipulate spoken language is ... the past 6 million years of human evolution to ... the best candidate gene we now have," says Wolfgang ... In his efforts to understand the molecular biological basis ... forward. The results of his latest study, undertaken in ...
(Date:9/18/2014)... 2014Many Americans across racial and ethnic groups describe ... on their day-to-day life, more so than other ... speech (57% of African-Americans, 49% of non-Hispanic whites, ... asked which disease or ailment is the worst ... among African-Americans followed by AIDS/HIV. Hispanics and ...
Breaking Biology News(10 mins):Microplastic pollution discovered in St. Lawrence River sediments 2Language evolution: Quicker on the uptake 2Language evolution: Quicker on the uptake 3Americans rate losing eyesight as having greatest impact on their lives 2Americans rate losing eyesight as having greatest impact on their lives 3
... A current controversy raging in evolutionary biology is ... many genes, each of relatively small effect, or just ... published in Molecular Ecology strongly supports the ... from the Department of Biology and the Redpath Museum, ...
... Robot squirrels from the University of California, Davis, ... a research project on the interaction between squirrels and ... how squirrels signal to snakes with heat and tail ... University and UC Davis aim to learn more about ...
... April 3, 2012 A team led by scientists ... prevent infection from widely differing strains of hepatitis C virus ... very high rate of mutation normally helps it to evade ... to sites on the viral envelope that seldom mutate. One ...
Cached Biology News:Robosquirrels versus rattlesnakes 2Robosquirrels versus rattlesnakes 3Scripps Research Institute scientists find promising vaccine targets on hepatitis C virus 2Scripps Research Institute scientists find promising vaccine targets on hepatitis C virus 3Scripps Research Institute scientists find promising vaccine targets on hepatitis C virus 4
(Date:9/18/2014)... MA (PRWEB) September 18, 2014 ... Molecule Sequencing (tSMS™) technology, announced today the closing ... of investment, led by Genomic Diagnostic Technologies, will ... and diagnostic applications. , Founded in March 2013 ... and Bioinformatics Analyst at Helicos BioSciences, SeqLL has ...
(Date:9/18/2014)... Artificial sweeteners, promoted as aids to weight loss and ... intolerance and metabolic disease; and they do it in ... of the gut microbiota the substantial population of ... of experiments in mice and humans, were published today ... Eran Elinav of the Weizmann Institute,s Immunology Department, who ...
(Date:9/18/2014)... The quest for the ultimate memory device for computing ... at The City College of New York led by ... exhibit both magnetic and ferroelectric properties. , Combining both ... can occur between them and for the devices that ... Combining these two properties in a single material, however, ...
(Date:9/18/2014)... September 18, 2014 September 24 marks ... MX. ASEA is the manufacturer of the world's first ... care product, RENU28. , The Mexico City event ... Duvan Botero, and ASEA Field Leader Shawn Catmull from ... PhD in Atomic/Medical Physics from the University of Utah ...
Breaking Biology Technology:SeqLL Closes Series-A Funding Round for Expansion of Single Molecule Sequencing 2Gut bacteria, artificial sweeteners and glucose intolerance 2Gut bacteria, artificial sweeteners and glucose intolerance 3Oxides discovered by CCNY team could advance memory devices 2Announcing the ASEA Mexico Grand Opening Tour Beginning September 18th 2
... , Strategic Examination and Consolidation of Services Recommended ... 27 Little uniformity exists in the structure or functions of ... to Clinical Trials Offices: What,s New in Research Administration?, ... (AAHC). Emerging centralized clinical trial offices (CTOs) are among the ...
... , , ATLANTA, Aug. 27 ... million extension of its Series C financing which was originally completed in ... $5 million in Series C preferred stock received warrants for an additional ... have up to 30 days from the delivery of Phase III top-line ...
... , , , ... ATLANTA, Aug. 27 Airo, recognized maker of the ... Safe handset is available for delivery Q4 of 2009. Airo ... in potentially explosive environments like Petroleum, Chemicals, Fertilizer, Coal, Propane, ...
Cached Biology Technology:Clinical Trials Offices Changing Academic Health Center Research Infrastructure 2Alimera Sciences Closes $5 Million in Extended Series C Financing 2Airo Wireless Announces the Release of the Intrinsically Safe A25is Cell Phone/PDA 2
... Polynucleotide Kinase catalyzes the transfer ... to the 5-terminus of polynucleotides ... 5-hydroxyl group. The enzyme, purified ... be used to phosphorylate RNA, ...
... Freezers for IVF are designed for human ... ease of setup and operation, and convenience. ... are continuously displayed on the control panel. ... are printed by way of the thermal ...
... adamanteus venom Description: Phosphodiesterase I ... in studying nucleic acid structure ... hydrolyzes 5'-mononucleotides from 3'-hydroxy-terminated ribo-oligonucleotides ... I cleaves ADP-ribosylated proteins at ...
... Life Science Rotarods are used to assess the ... fatigue resistance on mice and rats using one ... user friendly; the animals are placed on textured ... onto the individual sensing platforms below, its test ...
Biology Products: