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Tag: "sediments" at biology news

Antarctic ice shelf retreats happened before

... ocean currents shifted.' The scientists analysed sediments from the bottom of a freshwater lake close to the edge of the present George VI Ice Shelf. The results revealed that about 9500 years ago the ice shelf retreated, allowing the sea to flood into the lake. The ice shelf didn't reform until 1500 years l...

The secret to longevity in tubeworms

...acteria and archaea that live in the deep sea cold sediments surrounding the seep where the worm lives. These c...s. To date, the proposed return of sulfate to the sediments through the roots is only a hypothesis--albeit one with much to support it--that still awaits direct...

New Clues Add 40,000 Years to Age of Human Species

...nids—dubbed Omo I and Omo II—were once entombed in sediments on opposite sides of the Omo River in southern Eth...diometric dating techniques and a careful study of sediments and fossils, the researchers linked the Omo hominids, true Homo sapiens, to a single period in time....

Solution to Pollution: New Bacteria Eats Toxic Waste

...ural production and in the Netherlands to clean up sediments dredged from canals and waterways. “I want to congratulate the Utah State team on the funding for this project,?said Joop Harmsen, senior scientist at Alterra Research Center and Wageningen University in the Netherlands. “PAHs have contaminated large...

Family trees of ancient bacteria reveal evolutionary moves

...-absorbing pigments ?or find ways of growing under sediments to avoid the light." To study the evolution of Cyanobacteria, Blank drew up a backbone tree using multiple genes from whole genome sequences. Additional species were added to the tree using ribosomal RNA genes. Morphological characters, for instance...

Deep thinking: Scientists sequence a cold-loving marine microbe

...which prefers temperatures of -1° to 10° --hugging sediments along the Arctic floor, floating in the open ocean, and nestled inside Arctic and Antarctic sea ice. To explain C. psychrerythraea's unique cold-adapted chemistry, TIGR researchers and collaborators first sequenced the bacterium's genome and analyze...

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

...ery difficult due to logistical difficulties, lake sediments archive important information on environmental cha...ly accumulate sediments, and incorporated in these sediments is an archive of past environmental changes, much like pages in a book," says Dr. Douglas, the Canad...

World-first technology enables study of ancient bacteria

...ff University are investigating bacteria from deep sediments which despite high pressures (greater than 1,000 a...bacteria in the laboratory. "DNA analysis of deep sediments has shown diverse bacterial populations, including major new types, but we have been unable to cultu...

Vibrio bacteria could be a risk to fish as well as humans

...de range of marine environments, including corals, sediments and rotifers. For example, Vibrio coralliilyticus has recently been described as a new cause of disease in coral. Professor Brian Austin of Heriot-Watt University said that his research demonstrates that some of these new species are similar to exis...

India's smoking gun: Dino-killing eruptions

... has shown the remnants of the impact - iridium in sediments - sandwiched between lava flows, implying that volcanism started before the impact." In fact, most mass extinctions over the past 300 million years have coincided with large volcanic events, said Chenet. The general rule is that massive volcanism li...

Chernobyl: The true scale of the accident

...ical decay, and absorption of radionuclides in bed sediments and catchment soils. Because of bioaccumulation in the aquatic food chain, though, elevated concentrations of radiocaesium were found in fish from lakes as far away as Germany and Scandinavia. Comparable levels of radiostrontium, which concentrates i...

War on terror meets war on cancer

..., animals, soil and air. Later, stable isotopes in sediments or other materials were used to learn details about prehistoric environments, such as changing temperatures over time. In recent years, Ehleringer pioneered the use of stable isotopes to study what has been dubbed "the ecology of terrorism." He has ...

Ancient anthropoid origins discovered in Africa

...37 million years ago have been sifted from ancient sediments in the Egyptian desert, researchers have reported....n coming out of BQ-2 over the next few years." The sediments at BQ-2 lie nearly 750 feet below those of L-41 and were dated at around 37 million years old by mea...

Compound from marine bacteria shows potential as multiple myeloma therapy

...und derived from bacteria dwelling in ocean-bottom sediments appears in laboratory tests to be a potent killer of drug-resistant multiple myeloma cells, and potentially with less toxicity than current treatments, report Dana-Farber Cancer Institute researchers in the November issue of Cancer Cell. The experim...

Students discover 11,000 year old remains of Irish Elk

...ructure of the deposits in the cliffs, we only see sediments such as gravels, sands, muds and peats. "I just scraped the surface of the fallen cliff section ?which was in a block that had recently slid down the cliff ?and uncovered an orange streak which turned out to be an antler." As the block was in dan...

UCR environmental scientists propose chemical solution to cleaning California's Salton Sea

...h dissolved in the river water and attached to the sediments suspended in the rivers - and silt contribute to a...thing is done, this sea will shrink, exposing lake sediments that could generate dust and worsen air quality. Fish and fish-eating birds would disappear in 10-30...

Alleged 40,000-year-old human footprints in Mexico much, much older than thought

...orating with him in the dating of million-year-old sediments in an area of Ethiopia where White has excavated numerous fossils of human ancestors. He is not surprised at the new finding. "The evidence (the British team) has provided in their arguments that these are footprints is not sufficient to convince me...

Study finds evolution doesn't always favor bigger animals

...ations of tiny crustaceans retrieved from deep-sea sediments over the past 40 million years grew bigger and evolved into larger species, as might be predicted from Cope's Rule. However, the changes in the sizes of these clam-like crustaceans commonly known as ostracodes --from the genus Poseidonamicus -- incre...

Carbon cycle was already disrupted millions of years ago

...mical fossils of marine algae and land plants from sediments deposited in the aforementioned periods. Plants and algae assimilate CO2 from the air and water. Consequently changes in the isotope ratio are recorded in organic material. These chemical fossils have been well preserved because large parts of the oc...

Leave it to salmon to leave no stone unturned

... in a nice, gravel-bottom bowl that's free of fine sediments that can smother them. But consider the efforts of the grand dames of the salmon world, the female chinook ?or king ?salmon. The largest females are more than a yard long and tip the scales at 45 pounds or more. The biggest nests are nearly a foot a...

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