Quantcast
Last updated on April 24, 2014 at 10:24 EDT

Latest Chalcogens Stories

2009-09-10 15:01:07

Danish-led scientists say an analysis of rock found only in the world's oldest oceans has shed light on how large animals obtained a foothold on Earth. The team led by University of Copenhagen Professor Robert Frei said it has, for the first time, plotted the rise and fall of oxygen levels in the Earth's atmosphere that occurred during the last 3.8 billion years. By analyzing the isotopes of chromium in iron-rich sediments formed in the ancient oceans, the team found a rise in atmospheric...

b1eaf5245a5a3e212f68ae9e26b8a68a1
2009-09-10 05:25:00

Analysis of a rock type found only in the world's oldest oceans has shed new light on how large animals first got a foothold on the Earth. A scientific team led by Professor Robert Frei at the University of Copenhagen in Denmark, and including scientists from Newcastle University, UK, and universities in Uruguay and Southern Denmark, have for the first time managed to plot the rise and fall of oxygen levels in the Earth's atmosphere over the last 3.8 billion years. By analyzing the isotopes...

2009-09-01 04:00:00

HOUSTON, Sept. 1 /PRNewswire/ -- The International Fuel Quality Center (IFQC) has updated its ranking of the top 100 countries based on sulfur limits in on-road diesel -- Sweden, Germany and Japan, remained first, second and third, respectively. "This year's ranking shows the tremendous movement being made globally toward zero sulfur fuels, as the top 44 countries all have sulfur limits of 50 ppm or less," said Liisa Kiuru, executive director, IFQC. "We can expect to see sulfur reduction...

2009-06-30 13:20:48

A U.S. biologist says the accumulation of metals in plants may be a strategy to protect the plants from predators such as prairie dogs. Postdoctoral researcher John Freeman of Colorado State University and colleagues said certain plant species growing on soils with high metal content, such as arsenic, copper, selenium or lead, accumulate large quantities of metals in their leaves and stems. The purpose of that hyperaccumulation isn't fully known, but Freeman said it might increase a plant's...

2009-06-25 15:36:38

-Higher selenium levels in the blood may worsen prostate cancer in some men who already have the disease, according to a study by researchers at Dana-Farber Cancer Institute the University of California, San Francisco.A higher risk of more-aggressive prostate cancer was seen in men with a certain genetic variant found in about 75 percent of the prostate cancer patients in the study. In those subjects, having a high level of selenium in the blood was associated with a two-fold greater risk of...

2009-06-23 15:35:00

Prairie dogs may seem like harmless little creatures, but they can inflict serious injury on plants simply by snacking on them. Plants cannot flee from their furry predators, so how do they avoid becoming a prairie dog's lunch?Dr. John Freeman and colleagues explore the role of metal hyperaccumulation in plant defense in the June 2009 issue of the American Journal of Botany. Certain plants species growing on soils with high metal content (such as arsenic, copper, selenium, and lead)...

2009-06-23 11:55:56

U.S. scientists studying chemical bonds have discovered such bonds do not necessarily break faster when they are stretched. Our findings contradict the intuitive notion that molecules are like rubber bands in that when we pull on a chemical bond, it should always break faster, said University of Illinois Professor Roman Boulatov, who led the study. When we stretch a sulfur-sulfur bond, for example, how fast it breaks depends on how the nearby atoms move. Boulatov said the findings also...

2009-06-17 15:08:22

From balloons to rubber bands, things always break faster when stretched. Or do they? University of Illinois scientists studying chemical bonds now have shown this isn't always the case, and their results may have profound implications for the stability of proteins to mechanical stress and the design of new high-tech polymers."Our findings contradict the intuitive notion that molecules are like rubber bands in that when we pull on a chemical bond, it should always break faster," said...

2009-05-15 15:00:00

CHENGDU, China, May 15 /PRNewswire-Asia-FirstCall/ -- The Board of Directors of Apollo Solar Energy, Inc., (OTC Bulletin Board: ASOE; "Apollo Solar Energy" or "the Company"), a leading vertically integrated miner and refiner of tellurium (Te) and high-purity tellurium based metals for specific segments of the global electronic materials market, today announced financial results for the first quarter ended March 31, 2009. Revenue for the first quarter of 2009 increased 21% to $2.3...

2009-05-12 07:00:00

CHENGDU, China, May 12 /PRNewswire-Asia-FirstCall/ -- Apollo Solar Energy, Inc., (OTC Bulletin Board: ASOE; "Apollo Solar Energy" or "the Company"), a leading vertically integrated miner, refiner and producer of tellurium (Te) and high-purity tellurium based metals for specific segments of the global electronic materials market, today announced that Behre Dolbear Asia, Inc. ("BDASIA"), a wholly-owned subsidiary of Behre Dolbear & Company, Inc. ("Behre Dolbear") of Denver, CO, issued...