Tag: "collapse" at biology news

Researchers discover new mechanism of drug that alters genetic makeup of viruses

... upsetting its delicate balance, and forcing it to collapse upon itself. Typically, an RNA molecule consists of a long chain of phosphates in which the sugar is ribose and the bases are adenine (A), cytosine (C), guanine (G), and uracil (U). Those bases rest on the sugar backbone, resembling one side of a ...

Scientific theory of marine reserves to be released

...rence. The declining state of the oceans and the collapse of many fisheries creates a critical need for new and more effective management of marine biodiversity, populations of exploited species and overall health of the oceans, said Jane Lubchenco, co-chair of the NCEAS group, past president of AAAS and ch...

Tips from the journals of the American Society for Microbiology: February 2001

... In the early 1980s the Chesapeake Bay suffered a collapse of some of its fish stocks including the striped bass. Restrictions on fishing activity improved the fish populations in the early 1990s, but by the end of the decade there was again a noticeable decline in the striped bass population. After closel...

Johns Hopkins-led team discovers gene defect linked to lung disease

...ing the low surface tension needed to prevent lung collapse on exhalation. Deficiency of surfactant causes respiratory distress syndrome (RDS), a common cause of lung disease in premature infants. The newly identified mutation is a single DNA base pair error that results in a defective protein. Researchers sp...

Synthetic clay could assist radioactive waste cleanup

...sorb metal ions and then, reaching their capacity, collapse and seal the contaminants inside. The swelling micas are being explored for potential use in separating ions of heavy metals such as lead, zinc and copper as well as other radioactive materials, including strontium, from waste streams. Because they...

Yale physicists first to create a 'squeezed state' of atoms, which could lead to improved sensitivity ofnavigation systems used on planes and ships

...le of rubidium atoms so cold that all of the atoms collapse into a single quantum state. The results of their study, published in a recent issue of Science, may lead to improvements in the field of precision measurement and couldimprove navigational systems on planes and ships. "Our experiments are the firs...

Smart polymers provide size-selective switches to turn proteins on, off

...at as the polymer changed its properties, it would collapse into a compact globule to block the site, Stayton said. When it extended, it would allow a molecule that recognizes the site to attach. And if you collapsed the polymer and a molecule were already attached, the collapsing polymer could kick it of...

Collapse of simple life forms linked to mass extinction 200 million years ago

...ly and is demonstrated in the fossil record by the collapse of one-celled organisms called protists, according to new research led by a University of Washington paleontologist. "Something suddenly killed off more than 50 percent of all species on Earth, and that led to the age of dinosaurs," said Peter Ward, ...

Krauss book explores universe from oxygen atom's perspective

...unsettled, and dynamic universe. Caught up in the collapse of gas to form a star, a carbon atom -- an early ancestor of oxygen -- is blown into space after a supernova explosion and finds its way to a comet. That comet seeds another planet with the elements for growing life, only to have another asteroid des...

Tropical glaciers formed while earth was giant snowball

...del, GENESIS, to the coldest point just before the collapse and used climate outputs of temperature and precip...pical sea level glacial deposits formed before the collapse into snowball Earth. However, having them form after the oceans freeze also seemed problematic beca...

July media highlights: GEOLOGY and GSA TODAY

... El Nio frequency may have played some role in the collapse of the religious system expressed in the temples. Accelerated Pleistocene coral extinctions in the Caribbean Basin shown by uranium-lead (U-Pb) dating. Stephen R. Getty, University of New Mexico, Albuquerque, NM, USA; et al. Pages 639-642These author...

Using hard science to protect fragile seas

...dence. ``The declining state of the oceans and the collapse of many fisheries have created a critical need for new and more effective management of marine biodiversity,`` wrote Micheli and her colleagues in the consensus statement. ``At present, less than 1 percent of United States territorial waters, and les...

Overfishing sets the stage for other problems in marine ecosystems

...habitats iscited as a primary cause leading to the collapse of fish populationsaround coral reefs in the tropics, the article states. The paper is based on four types of records: modern ecological records, historical information about fishing activities starting from the 15thcentury, archeological records...

Cover story in Science reveals historical overkill of marine Megafauna triggered current ocean crises

...ed that overfishing has caused the well-publicized collapse of sea lion and sea otter populations in the Berin...the great whales by humans has contributed to this collapse in a heretofore unrecognized manner. Whaling and overfishing forced killer whales to switch prey fro...

Excessive fishing prompted coastal ecosystems to collapse, but wise management now will help

...e good that that many more marine ecosystems could collapse soon. "Place names for oysters, pearls and conches conjure up other ecological ghosts of marine invertebrates that were once so abundant as to pose hazards to navigation, but witnessed now only by massive garbage heaps of empty shells," they wrote. ...

Europe and United States assess international support of science in Russia and Ukraine

... economic crisis, Russia and Ukraine saw a virtual collapse of their scientific infrastructure. Western governments and organizations responded with an array of programs designed to help science and scientists in Russia and Ukraine, and the former Soviet Union (FSU) survive in the short term, and to rebuild t...

Influence of gender on upper airway structure and function during obstructive sleep apnea

... (OSAS) is characterized by recurrent upper airway collapse and obstruction. Upper airway structure and functi...d then raised back to atmospheric. Complete airway collapse was achieved in all subjects. Results Of Influence of Gender on Upper Airway Structure and Functio...

Green Mud cure for $2 billion loss

...e works of art, combining: weight to prevent hole collapse and to withstand formation pressure lubricity thermal stability high drilling penetration rate ability to prevent stuck pipe good ability to transport cuttings smoothly resistance to contamination efficiency of the membrane with which they coa...

North Atlantic study reveals food fish catches have declined by half - despite tripled fishing effort

...le, this new ocean wide synthesis reveals that the collapse applies to the entire North Atlantic Ocean. You may think we are making headway with a few individual stocks, but overall we are unequivocally losing the battle to manage fisheries in the North Atlantic, says Pauly. Unless you have both long term and...

Fusion in a flash?

...ny researchers believe that the shock waves of the collapse generate high temperatures and pressures in the bubbles gas, which releases a burst of energy. Scientists have learned to trap single bubbles within a sound wave, causing them to swell and shrink and emit light in a regular fashion. Temperatures insi...

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