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Tag: "currents" at biology news

Antarctic ice shelf retreats happened before

...years. The retreat coincided with a shift in ocean currents that occurred after a long period of warmth. Whils...s some of the first evidence that a shift in ocean currents can actually destroy ice shelves. In this case it's possible that a preceding warm period may have p...

Nanogen Issued Patent for Electronic Microarray With Memory

...emory circuits provides for precise control of the currents delivered to individual electrodes on the array, while minimizing the utilization of "off-chip" circuitry and overall system costs. The electric potential is controlled at each of the NanoChip's 400 test sites to move and concentrate DNA or RNA, prov...

New strategies to reduce hospital-aquired infections

...arate from the main water stream and spread by air currents in all directions. Some of these contaminants are inhaled as aerosols (tiny water droplets containing microbes) or condensed on surfaces where they can be touched. Many of the bacteria found in biofilm, such as legionella pneumophila, are exhibiting...

Distributed Basic Local Alignment Search Toolkit (W.ND-BLAST)

...arate from the main water stream and spread by air currents in all directions. Some of these contaminants are inhaled as aerosols (tiny water droplets containing microbes) or condensed on surfaces where they can be touched. Many of the bacteria found in biofilm, such as legionella pneumophila, are exhibiting...

An (ecological) origin of species for tropical reef fish

...h species on reefs in an open undersea world where currents constantly stir the waters, washing in fish or their larvae from afar, a world without well-defined geographical barriers? Rocha et al. took a close look at the genetics of one group of Western Atlantic tropical reef fishes (wrasses, genus Halichoere...

Researchers use 3-D imaging system to unveil swimming behavior of microscopic plankton

...standing of zooplankton swimming response to ocean currents has remained elusive, mainly due to the lack of te...y "treadmilling" against upwelling and downwelling currents at speeds of up to several tens of body-lengths per second. "Clumped distribution, termed 'patchine...

Plankton can run, but can't hide from basking sharks

...time, float to the surface and then drift with the currents like a "electronic messages in bottles", before being washed up on beaches and found by the public. Sims found that while the sharks in deep waters exhibited normal diving behaviour, tracking the zooplankton Calanus up to the surface at dusk and the...

Industrial contaminants spread by seabirds in High Arctic, new Canadian study shows

...of the globe, and are transported by air and ocean currents toward cold areas like the Arctic. "Some chemicals will build up in the food webs that comprise northern traditional diets," says Ms Kimpe. "As a result, some of our northern Canadian populations are among the most mercury and PCB-exposed people on ...

Ships bring alien jellyfish invaders to our shores

...ing genetic data and computer simulations of ocean currents and water temperatures, researchers from the University of New South Wales and the University of California, Davis, have revealed that the moon jellyfish could not have migrated naturally, according to a report in today's Proceedings of the National ...

Stem cells' electric abilities might help their safe clinical use

...rrent study, the researchers measured the electric currents of single human ESCs, discovered several channels that allow and control passage of potassium, and observed the electric current's effect on cell differentiation and proliferation. "In a number of different cell types, from cancer to T-lymphocytes, ...

Cyberkinetics, Case to develop system to help restore extremity function

... FES is a method of applying low level electrical currents to the body to restore or improve function. A heart pacemaker is one example of an FES System. Another example of an FES System is one which employs an electrical current to restore movement by initiating muscle contractions in paralyzed extremitie...

How sperm crack the whip

...technique they used to eavesdrop on the electrical currents inside the squirming sperm cell could literally op...ad ever seen inside sperm cells to measure all the currents that control their activity," he said. "We are already measuring many of these currents and beginnin...

Vital ocean prey play active role in environment

...nter and early spring, the juveniles move with the currents back to inshore waters. In summer, the juveniles are found inshore of the adults. The life cycle thus keeps krill in younger stages separate from adults, which reduces competition for food and lessens the chance that adults will prey on younger stage...

Healthy coral reefs of Madagascar resisting damage from climate change

...an Ocean reefs. The researchers believe cool water currents from adjacent deep ocean areas offset the warming effects of climate change. "The resiliency and health of the coral reefs with their biodiversity and endemism makes the reefs of Madagascar a high conservation priority," said Gerald R. Allen, a lead...

On the track of tiny larvae, a new model elucidates connections in marine ecology

...ble to follow directly, advances in modeling ocean currents have made it possible to predict larval movements. However, until now it has remained difficult to test these movement predictions in the field by comparing the model to data from population genetic studies. The new work enables scientists to fiel...

Gatekeeping: Penn researchers find new way to open ion channels in cell membranes

...ontrolled passage of ions generates the electrical currents that enable nerve impulse transmission, hormone secretion, and muscle contraction and relaxation. When there are changes to the channel, such as by mutations in a channel gene, disease can result. For example, mutations in some channel genes cause ca...

Stimulation of the semicircular canals can artificially control human walking and balance

By applying electrical currents across the heads of people while they walk, researchers have improved our understanding of how our vestibular system helps us maintain upright posture; at the same time, the researchers found that the stimulus could be applied in a way that allowed a...

Global warming may have damaged coral reefs forever

...coral structures and the absence of favourable sea currents to transport the larvae could be largely to blame. Yet while a bleak picture is painted in the inner islands of the Seychelles, the survey area, from a diving perspective the outer carbonate islands still offer healthy coral reefs. Early results f...

The secret lives of sea slugs

... 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 flatten out their bodi...

Ocean temperature predicts spread of marine species

..., reproduces via larvae that drift far along ocean currents before returning to join adult populations. The distance larvae travel before maturing, called dispersal, is directly linked to ocean temperature, the researchers found. For example, larvae from the same species travel far less in warmer waters than ...

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