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Thu, 24 Jul 2014 17:21:06 EDT
Earlier Stone Age artifacts found in Northern Cape of South Africa
Excavations at an archaeological site at Kathu in the Northern Cape province of South Africa have produced tens of thousands of Earlier Stone Age artifacts, including hand axes and other tools.
Thu, 24 Jul 2014 17:21:02 EDT
Parched West is using up underground water: Study points to grave implications for Western U.S. water supply
A new study finds more than 75 percent of the water loss in the drought-stricken Colorado River Basin since late 2004 came from underground resources. The extent of groundwater loss may pose a greater threat to the water supply of the western United States than previously thought.
Thu, 24 Jul 2014 17:19:56 EDT
Biologist warn of early stages of Earth's 6th mass extinction event
The planet's current biodiversity, the product of 3.5 billion years of evolutionary trial and error, is the highest in the history of life. But it may be reaching a tipping point. Scientists caution that the loss and decline of animals is contributing to what appears to be the early days of the planet's sixth mass biological extinction event. Since 1500, more than 320 terrestrial vertebrates have become extinct. Populations of the remaining species show a 25 percent average decline in abundance. The situation is similarly dire for invertebrate animal life.
Thu, 24 Jul 2014 14:43:16 EDT
How to power California with wind, water and sun
New research outlines the path to a possible future for California in which renewable energy creates a healthier environment, generates jobs and stabilizes energy prices.
Thu, 24 Jul 2014 14:42:53 EDT
Pesticide linked to three generations of disease: Methoxychlor causes epigenetic changes
Researchers say ancestral exposures to the pesticide methoxychlor may lead to adult onset kidney disease, ovarian disease and obesity in future generations.
Thu, 24 Jul 2014 14:42:47 EDT
Linking microbial, immune environment in semen to HIV viral load, transmission
HIV infection re-shapes the relationship between semen bacteria and immune factors which in turn affects viral load, suggesting that the semen microbiome plays a role in sexual transmission of HIV, researchers report. While HIV is found in many body fluids, sexual transmission through semen is the most common route of infection.
Thu, 24 Jul 2014 14:42:43 EDT
No returning to Eden: Researchers explore how to restore species in a changing world
Reversing the increasing rate of global biodiversity losses may not be possible without embracing intensive, and sometimes controversial, forms of threatened species management, according to zoologists.
Thu, 24 Jul 2014 14:16:12 EDT
Synchronization of North Atlantic, North Pacific preceded abrupt warming, end of ice age
Scientists have long been concerned that global warming may push Earth's climate system across a 'tipping point,' where rapid melting of ice and further warming may become irreversible -- a hotly debated scenario with an unclear picture of what this point of no return may look like. A new study suggests that combined warming of the North Atlantic and Pacific Oceans thousands of years ago may have provided the tipping point for abrupt warming and rapid melting of the northern ice sheets.
Thu, 24 Jul 2014 14:16:08 EDT
DNA mostly 'junk?' Only 8.2 percent of human DNA is 'functional', study finds
Only 8.2 percent of human DNA is likely to be doing something important -- is 'functional' -- say researchers. This figure is very different from one given in 2012, when some scientists involved in the ENCODE (Encyclopedia of DNA Elements) project stated that 80% of our genome has some biochemical function.
Thu, 24 Jul 2014 14:16:04 EDT
Atomic structure of key muscle component revealed
Adding to the growing fundamental understanding of the machinery of muscle cells, a group of biophysicists describe -- in minute detail -- how actin filaments are stabilized at one of their ends to form a basic muscle structure called the sarcomere. With the help of many other proteins, actin molecules polymerize to form filaments that give rise to structures of many different shapes. The actin filaments have a polarity, with a plus and minus end, reflecting their natural tendency to gain or lose subunits when not stabilized.
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