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Tag: "swimming" at biology news

Caribbean frogs started with a single, ancient voyage on a raft from South America

...t likely that the frog species dispersed simply by swimming because frogs dry easily and are not very tolerant of salt water. In addition to the study's discoveries about Caribbean and Central American frogs, the research also revealed and defined an unusually large and unpredicted group of species in Sout...

Definitive evidence found of a swimming dinosaur

..., contains the first long and continuous record of swimming by a non-avian therapod dinosaur. A team led by ... the surface of the site indicate the dinosaur was swimming against a current, struggling to maintain a straight path. "The dinosaur swam with alternating mo...

Want to save polar bears? Follow the ice

...ears generally cannot get anywhere near these fast swimming marine mammals. Another threat to the bears is the unpredictability of the melting of the sea ice away from the coast regions that bears shift to in the warmest parts of the year. Bears that make it to shore may be there for increasingly longer peri...

Statin treatment improves spatial memory in mouse models of Alzheimer's

...up only received saline. Each day the mice had two swimming trials in the water maze, giving them a chance to learn how to reach a platform. Food was always available and safety makes taken during the entire trial. On the seventh day the animals were tested for spatial memory, in other words low long it to...

Hearts of male and female rainbow trout are different

...tained cardiac function to maintain its health and swimming activity. Previous studies of trout cardiac per... and function may help define habitat suitability, swimming capabilities and health status of wild and hatchery-reared rainbow trout, and human heart disease, s...

A 'traffic light' for neurons means 'go' for improving brain research

...able to cause tiny worms called C. elegans to stop swimming while their genetically altered motor neurons were exposed to pulses of yellow light focused through a microscope. In some experiments, exposure to blue light caused the worms to wiggle in ways they weren't moving while unperturbed. When the lights w...

Tracking sperm whales and jumbo squid

...successful tagging of sperm whales and jumbo squid swimming together off Mexico’s Pacific coast—the first time...s were placed on five whales and three jumbo squid swimming nearby. Analysis of the tagging data showed that the whales were traveling up to 60 miles a day with...

Researchers develop technique for bacteria crowd control

...centrate, manipulate, and separate a wide class of swimming bacteria has been identified through a collaborati...ystems of interacting self-moving objects. Besides swimming bacteria, other examples include bird flocks, fish schools, motor proteins in living cell, and even ...

New sensor detects gaseous chemical weapon surrogates in 45 seconds

... of air that would fill more than two Olympic-size swimming pools. "QPAS is an extremely sensitive and selective chemical detection technique that can be miniaturized and yet is still practical to operate in field environments," said Michael Wojcik, a research scientist at PNNL. "The laser, tuning fork and...

Swimming 'to the left' gets bacteria upstream, and may promote infection

...one side ?to the left." The study determined that swimming "to the left" is a hydrodynamic process that is fu...tions for multiplying. "We think that upstream swimming of bacteria may be relevant to the transport of E. coli in the urinary tract," said Köser. "It might...

New insights into autoimmunity and depression

...ere then subjected to a series of tests: a forced swimming test in a glass beaker partially filled water to e...i-ribosomal P antibody-injected mice on the forced swimming test. The immobility time of these mice was twice as high as that of the control group, indicating a...

Fishy cooperation

... videos, such as the one showing a grouper and eel swimming side by side as if they are good friends on a stroll. It also offers quantification, which is truly hard to achieve in the field, of the tendencies involved in this mutually beneficial arrangement. The investigators were able to demonstrate that the ...

New dwarf buffalo discovered by chance in the Philippines

...igrated to the Philippines during these periods by swimming short distances between islands. Once the glaciers melted and sea levels rose, these mammals became isolated on their respective islands. Over the years, they evolved into the unique species found there today. According to Heaney, about 200 native...

Paramecia adapt their swimming to changing gravitational force

...field up or down, the researchers could change the swimming behavior of the paramecia dramatically. In high gr...times normal gravity, the little swimmers stalled, swimming upward, but making no progress. At this break-even point, the physicists could measure the force nee...

Researchers reveal mystery of bacterial magnetism

... in a magnetic field, the bacteria align like tiny swimming compass needles, a phenomenon call magnetotaxis. ...e oxygen concentrations it prefers more quickly by swimming only up and down in the earth's magnetic field rather than randomly in all directions. An analogy w...

The secret lives of sea slugs

...al behaviors, including escaping from predators by swimming up into water currents that hurl them (un-sluggishly) end over end downstream and away from harm, as well as crawling aggressively (for slugs) upstream to breed and feed. The observations also correlated with earlier studies suggesting that sea slugs...

UCI scientists find chlorine may contribute to ozone formation

... wind. Chlorine gas also is used to treat water in swimming pools, cooling towers and municipal water supplies. Chlorine atoms react rapidly with hydrocarbons and nitrogen oxides from automobile and power plant emissions, contributing to the complex chain of reactions that leads to ozone formation. The primar...

Time of day tempers tadpoles' response to predators

...d. Typically, the tadpoles respond to such cues by swimming down to the bottom, seeking shelter and remaining ... day and one hour at night. Then he recorded their swimming and feeding activity during and after exposure. Both during the day and at night, the tadpoles initi...

Giant deep-sea tubeworm's meal ticket comes in as a skin infection

...Previous groups had shown that, after a larvaquits swimming and attaches itself to thebottom of the ocean near a volcanic vent, itsmouth disappears and its stomach shrinksaway, even as it grows a specialized organcalled the trophosome that houses thesymbiotic bacteria it collects. "It is anabsolutely obligate...

How ancient whales lost their legs, got sleek and conquered the oceans

... when they happened," Thewissen said. "Studies on swimming in mammals show that a sleek body is necessary for efficient swimming, because projecting organs such as rudimentary hind limbs cause a lot of drag, and slow a swimmer down," said Thewissen, who spends about a month every year in Pakistan and India c...

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