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Forget the antioxidants? McGill researchers cast doubt on role of free radicals in aging

This release is available in French . For more than 40 years, the prevailing explanation of why we get old has been tied to what is called oxidative stress. This theory postulates that when molecules like free radicals, oxygen ions and peroxides build up in cells, they overwhelm the cells'...

Penn-Wistar team gains insight into HIV vaccine failure

...f Pennsylvania reports new evidence refuting a popular hypothesis about the highly publicized failure in 2007 of the Merck STEP HIV vaccine study that cast doubt on the feasibility of HIV-1 vaccines. The findings were published on-line July 20 in Nature Medicine . The phase II STEP vaccine trial was s...

A matter of density, not quantity

...fined in extremely small volumes. The term, quorum sensing, is derived from the Latin quorum; in politics, this is the number of votes that must be cast for an election or referendum to be valid. In biology, quorum sensing is defined as a process by which cells are able to detect the accumulation of a ...

Corals stay close to home

...ealthy populations can be encouraged. A recent study by Australian biologist Jim Underwood has found surprisingly that despite the fact that corals cast their eggs and sperm haphazardly into the oceans, certain species of coral show remarkable fidelity to their home range. Underwood sampled DNA from...

CU-Boulder study shows Maya intensively cultivated manioc 1,400 years ago

...rvested manioc," said Sheets, who discovered Ceren in 1978. Ash hollows in the manioc planting beds at Ceren left by decomposed plant material were cast in dental plaster by the team to preserve their shape and size, said Sheets. Evidence showed the field was harvested and then replanted with manioc s...

'Fattysaurus' or 'thinnysaurus'? How dinosaurs measure up with laser imaging

...biomechanics research group have reconstructed the bodies of five dinosaurs, two T. rex (Stan at the Manchester Museum and the Museum of the Rockies cast MOR555), an Acrocanthosaurus atokensis , a Strutiomimum sedens and an Edmontosaurus annectens . The team, whose findings are published in the P...

Weizmann Institute scientists discover how cancer cells survive a chemotherapy drug

...titute's Molecular Cell Biology Department, the question posed an interesting challenge. To approach it, they needed a method that would allow them to cast a wide net on the one hand to sift through the numerous cellular proteins that could conceivably affect survival but that would let them zoom in on ...

NYU scientists discover dangerous new method for bacterial toxin transfer

... walls are similar in structure to that of L. monocytogenes could take up the Staph aureus pathogenicity islands through phage infection. They hope to cast a wider net in follow-up studies to determine whether other species could be hosts for pathogenic Staph aureus genes. In addition, they plan to follow...

Synthetic biology: Is ethics a showstopper?

...ld be dependent on synthetic biology. To attend this event, RSVP to nano@wilsoncenter.org . No RSVP is required to view the Web cast. *** Web cast LIVE at www.wilsoncenter.org *** What: Synthetic Biology: Is Ethics a Showstopper? When: Thursday, January 8, 2009, 12:30 1:30 PM ...

Europe cores in EUROCORES: Ocean drilling in EuroMARC

... and biological processes and have high-resolution records of the Earth's history in store for us. Scientific marine drilling and coring is crucial to cast light on both the deep and shallow (sub-) seafloors to advance our knowledge in the Earth and environmental sciences. The European Science Foundat...

Female embryonic sexual development driven by universal factor

... complex and ambiguous, however, leading some to reject it. Yao and graduate student Chia-Feng Liu wanted to investigate a particular player in the cast of molecules known to be involved in transforming the primordium into testis or ovary. This molecule, beta-catenin, is an important regulator of cell ...

Caltech-led researchers find negative cues from appearance alone matter for real elections

...mpetent to hold congressional office, or which looked more likely to physically threaten the volunteer. In other experiments, volunteers were asked to cast their vote for one politician in the pair; once again, their decisions were based only on the politicians' appearances. The results correlated wit...

Earliest animal footprints ever found -- discovered in Nevada

...legs only pressed shallow pinpoints into that long-ago sea bed. But when Babcock flipped over the rock containing those tracks, the low-angle sunlight cast the dots in crisp shadow. He immediately suspected that the tracks were made by an arthropod, such as one resembling a centipede or millipede, or b...

Women do not recover their muscle strength as fast as men

...n men to experience a broken forearm and require a cast (immobilization). To examine whether the effects o...th was still 30% lower when compared to before the cast was applied. These finding may have implications f... of Voluntary Muscle Strength Following 3-Weeks of cast Immobilization Is Suppressed in Women Compared to ...

American Chemical Society's Weekly PressPac -- July 23, 2008

...x: 44 1582 760981 Email: Fangjie.Zhao@bbsrc.ac.uk ARTICLE #5 EMBARGOED FOR 9 A.M., EASTERN TIME, July 28, 2008 Air pollution worries cast cloud over Olympics in Beijing Chemical & Engineering News Winning gold medals won't be the only thing on the mind of athletes during the Olympi...

Academy publishes first biography of artist-naturalist Benjamin Waterhouse Hawkins

...e first mount of a dinosaur skeleton, Hadrosaurus foulkii , at The Academy of Natural Sciences in Philadelphia. As the museum prepares to remount a cast of Hadrosaurus in November, the Academy is pleased to announce publication of the first full-length biography of Hawkins. All In the Bones: A Biograp...

Closing the gap between fish and land animals

... New exquisitely preserved fossils from Latvia cast light on a key event in our own evolutionary history, when our ancestors le... of the extremely primitive tetrapod Ventastega from the Devonian of Latvia cast light on this key phase of the transition. "Ventastega was first describ...

Does fishing on drifting fish aggregation devices endanger the survival of tropical tuna?

...ggregation behaviour, but the past 20 years have seen purse-seine fishery operators take advantage of the associated concentrations of fish. Fishermen cast off floating rafts equipped with buoys which act as FADs. An enormous purse-seine net, deployed in a wide arc on either side of the vessel, encircles ...

Michigan Tech researchers link 11 genetic variations to type 2 diabetes

...cal University have developed powerful new tools for winnowing out the genes behind some of humanitys most intractable diseases. With one, they can cast back through generations to pinpoint the genes behind inherited illness. With another, they have isolated 11 variations within genescalled single nucl...

Team probes mysteries of oceanic bacteria

... bacteria is to grow them in Petri dishes in a laboratory, but that yields limited information, and not all strains are suited to life in the lab. The cast of characters we can grow in the lab is a really small percentage of whats out there, said DeLong, who is research coordinator for C-MORE. The MIT ...

Lemurs' evolutionary history may shed light on our own

... version of a woodpecker. They also resolved the relationships among species within the remaining four evolutionary lineages, which includes a diverse cast of characters: the sifakas, named for the hissing shee-fak sound they make; the sportive lemurs, which are strictly nocturnal; the mouse lemurs, the s...

MIT reports new twist in microRNA biology

... CAMBRIDGE, Mass. - MIT scientists have found a new way that DNA can carry out its work that is about as surprising as discovering that a mold used to cast a metal tool can also serve as a tool itself, with two complementary shapes each showing distinct functional roles. Professor Manolis Kellis and po...

Vega main engine test in Kourou

... size, it contains a single propellant segment, instead of several segments cast separately before being mated together. Taking advantage of its similar...fewer elements, to reduce production costs. It also includes complex-formed cast metal parts and a new thermal insulation material. The nozzle joint is more...

Brilliant perspectives

...now preparing them vigorously. Exploring the nanoworld with PETRA III is also a challenge with respect to construction technique. The hall floor is cast as a single one-metre-thick concrete slab that will support both the accelerator and the experiments. The slab is isolated from the vibrations of the ...

Tiny fish can yield big clues to Delaware River health

... minnow in the Upper Delaware River basin. Academy fisheries scientists David Keller and Shane Moser, under the direction of Dr. Richard Horwitz, have cast their seine nets and gone snorkeling many times at various locations over the last year with varying results. Their findings will shed light on the he...

CAST rolls out biofuel commentaries in New Orleans

... The presentations include the roll-out of two new cast Commentaries on biofuel byproducts and ethanol pro...cussion session How Do We Plan to Meet the Demand, cast will introduce its new Commentary, Convergence of ...teven Fales, Iowa State University, Ames. This new cast Commentary covers several critical questions, incl...

Stanford/Packard researchers find disease genes hidden in discarded data

..., re-analyzed publicly available data from 49 experiments conducted using different methods in a variety of animals from humans to rats to worms. They cast a wide net: The only thing the studies had in common was that they were each designed to ferret out genes or proteins important to fat storage or body...

Unmasking DNA

...tterns on the substrate. The researchers call this process "DNA shadow nanolithography" because the metal film is deposited at an angle and the shadow cast by the DNA molecules defines the dimensions of the features on the substrate. Anisotropic etching of the patterned surfaces using reactive gas plasm...

The world's oldest bacteria

...aces of still living organisms that old been found. The exceptional discovery can lead to a better understanding of the ageing of cells and might even cast light on the question of life on Mars. The discovery is being published in the current issue of PNAS (Proceedings of The National Academy of Sciences ...

CU-Boulder team discovers first ancient manioc fields in Americas

...ver several large, parallel planting beds separated by walkways, said Sheets. Ash hollows in the planting beds left by decomposed plant material were cast with dental plaster to preserve their shapes and subsequently were identified as manioc tubers, an important, high-carbohydrate food source for Latin ...

Dominant cholesterol-metabolism ideas challenged by new research

... A team of researchers investigating cholesterol and lipid transport has performed experiments that cast serious doubt on the dominant hypothesis of how the body rids its cells of "bad" cholesterol (LDL) and increases "good" cholesterol (HDL). Choleste...

Study investigates 'divorce' among Galapagos seabirds

...t males of this species are probably never permanently in or out of the mating game, in contrast to many other animals, she said. A male Nazca booby cast off by a current mate may be selected by a different female the next year, after he has had a chance to regain his condition. ...

Biologically inspired sensors can augment sonar, vision system in submarines

...issue of the Proceedings of the National Academy of Sciences. To fabricate the tiny, three-dimensional structures, individual components are first cast in place on sacrificial layers using photolithography and planar deposition. A small amount of magnetic material is electroplated onto each of the par...

'The eyes have it' -- Autism research yields surprising results

...rs believe that this lack of ability could be central to the social problems experienced by autistic children and adults. But the latest findings cast doubt on this hypothesis. A study at The University of Nottingham found that autistic children were able to interpret mental states when looking at an...

Living laboratory found on shoreline statues

...ideal habitat for settlement as well as offering scientists an important insight into factors influencing colonisation. The installation of the cast iron figures - each a replica of the artist's own body, and identical in size, shape and material - offer a perfectly replicated study environment to ...

Nice guys do finish first in lizards' evolutionary race

...ange because the bullies aren't sticking close enough to home to keep an eye on things. Research has focused on why the blue throats are willing to cast aside their own opportunities to procreate for the benefit of a friend. "Why not abandon them and become loners ?why not go it alone?" McAdam said....

Gut microbes' partnership helps body extract energy from food, store it as fat

...ng in our digestive systems and how they form strategic alliances with one another to benefit themselves and us. They also have to learn how much this cast of microbial characters varies in different human individuals. "We are superorganisms containing a mixture of not just human cells but also bacteri...

Polynesia explorers created worldwide web of scientific knowledge

... travelers who came aboard, bringing "their own thirst for knowledge, power, and prestige," Liebersohn wrote. In truth, their enterprises engaged a cast of thousands, all of whom interacted in the "multifaceted network": patrons, collaborators, philosophers back home, missionaries abroad and travel wri...

How satellite tracking revealed the migratory mysteries of endangered Atlantic loggerhead turtles

...erative effort in seven African states is needed to create a strategy that would protect them." Research* shows that in 2000 1.4 billion hooks were cast into the world's oceans through industrial fishing. It's thought that globally more than 200,000 loggerhead turtles were incidentally caught by fisher...

Life, the remake

... If the history of life were to play out again from the beginning, it would have a similar plot and outcomes, although with a different cast and timing, argues UC Davis paleontologist Geerat Vermeij in a new paper in the Proceedings of the National Academy of Sciences. "Evolution at this ...
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