Tag: "trapped" at biology news

Biologists raising baby loggerhead turtles for conservation find disturbing gender trend

...ood, but the air-breathing reptiles also have been trapped and drowned inadvertently in fishermen's nets. Additionally, beach development has deprived the turtles of nesting sites. In response to research by Crowder and other scientists, the National Marine Fisheries Service now requires commercial fisherm...

Wetlands clean selenium from agricultural runoff

...nts slows down the water flow so the selenium gets trapped in the sediment. The plants also provide a source of fixed carbon to fuel microbes, which metabolize the selenium into non-toxic gas. It is truly an amazing process." The UC Berkeley research is part of a larger project funded by the UC Salinity/Dra...

Physics tip sheet #30 - January 9, 2003

...aper describes how a radioactive potassium atom is trapped with magnets and lasers to watch it decay. By carefully analyzing the paths of the decay products, details about the neutrino can be deduced. Journal article: http://link.aps.org/abstract/PRL/v90/e012501...

'Moss in space' project to test how plants grow 'up'

...of the tip cells. They remain trapped in certain zones within the cells, apparently supported and contained by an intricate scaffold-like structure of microtubules and actin microfilaments within the cell. The earlier Shuttl...

New study of healthy men finds semen quality decreases with age

...in mind. Sperm that swim around in circles may get trapped in the female mucosa, while sperm that moves in a linear direction will have a greater chance of colliding with the egg." Progressive motility started to decrease in men in their 20s by 3.1 percent per year. By age 30, the probability of progressive...

Early Mars: Warm enough to melt water?

...e impacts would warm the atmosphere and melt water trapped in underground and surface ice, causing rivers to flow and cutting the valleys that rival Arizona's Grand Canyon. "I do not think this is right," said Dr. James F. Kasting, distinguished professor of geosciences and meteorology. "I do not think th...

New life discovered in deep ocean floor

...net. Could frozen methane (called methane hydrate) trapped in the ocean floor be the answer to the world's energy problems? Even conservative estimates of the potential for this untapped resource are tantalizing, so researchers are trying to develop realistic models of hydrate distribution and rate of format...

Clock tells time at such speed that reading it becomes challenge

...gues developed the optical clock based on a single trapped mercury ion, and they promise that their research may someday end the reign of the microwave atomic clocks, which use cesium 133 atoms to determine the time. Cesium atoms resonate exactly 9,192,631,770 times per second, when irradiated by a magnetic ...

Optical trap provides new insights into motor molecules - nature`s ultimate nanomachines

...ica bead. The kinesin and bead were then optically trapped and subjected to minute forces in four directions - forward, backward, left and right. ''It turns out that when you apply a sideways force, you slow down the motor a bit but not much - 30 percent or so,'' said physics graduate student Joshua Shaevitz...

Scientists find evidence for crucial root in the history of plant evolution

...of fresh water. Rhynie fossils were preserved when trapped in silica precipitated from hot spring fluids. Over time, the amorphous silica crystallized to form a fine-grained rock known as chert, which protected the fossils. "Different thermal events over 400 million years have transformed some of this materi...

Highway deaths highest for males Male urban squirrels, that is

... park-like campus their laboratory for study. They trapped 20 squirrels, fitted each with a miniature collar equipped with a battery-powered transmitter, and released each squirrel within 15 minutes of capture. The radio-collared squirrels were monitored five to seven times a week by undergraduate and gradu...

Science picks-leads, feeds and story seeds (May 2003)

...han a half a million gallons of fuel oil are still trapped in the damaged hull and, as it further degrades in the salty environment, the oil poses an environmental risk. The USGS is advising the National Park Service on placing oceanographic instruments on the Arizona to study the seawater environment around...

Secrets of drug resistance in bacteria

...uter membrane. This protein ejects the antibiotics trapped in the AcrB cavity. If it's blocked, the pump can't work. As McDermott explains, perhaps a specially designed molecule could lodge inside the funnel, rendering the pump useless and allowing antibiotics to slip inside the cell unhindered. To support t...

Mouse model offers new explanation for kidney disease and failure

...from the blood may normally pass through or become trapped in the filters of the kidney and that an important process is the removal or clearance of these proteins from the kidney." The glomerular abnormalities in mice lacking one copy of CD2AP are very similar to a disease in humans called focal segmental ...

PNNL findings may help preserve Dungeness crab

... looking at crab entrainment, or how many crab are trapped by dredges, PNNL researchers compared entrainment data and levels of salinity in the river, finding that lower levels of salinity meant less crabs. As salinity increased, so did crab abundance. "By timing dredging to coincide with lower levels of sal...

Brain cells seen recycling rapidly to speed communications

... washed out of neuronal membranes, but it remained trapped in the vesicles, enabling the researchers to take snapshots of their activity at synapses following electrical stimulation, using a microscope, pulses of fluorescent light, and a CCD imaging device. When they tracked single vesicles following stimu...

Missing link detected in insulin mechanism

...e transporters they need on their cell surface are trapped inside and it takes a higher concentration of insulin to move additional transporters to the cell surface. Lienhard stresses that studies of the protein in diabetic rodent models need to be done. The findings could also shed light on how hormones re...

'Unzipping' double helix to study protein-DNA interaction

...s the microscope cover slip is moved away from the trapped microsphere; when the unzipping fork in the DNA reaches a bound protein molecule, a dramatic increase in the tension in the DNA followed by a sudden tension reduction is detected; and finally analyses of the unzipping forces and length of the DNA t...

Museum mammal collection network to aid conservation and research

...oped, collection data from member institutions was trapped in hand-written ledgers or stand-alone databases inaccessible via the Web. Now scholars can quickly access information online that formerly required weeks, months, or years and many staff hours of effort to collate. Distributed network access to nat...

Another global warming surprise: Grasslands may become wetter as temperatures rise

... the plants shut down, the moisture is effectively trapped in the soil," he noted. Global Change Experiment The PNAS study is the third in a trilogy of papers published in the last eight months by the Jasper Ridge Global Change Project. This multiyear experiment is designed to demonstrate how grassland eco...

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