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Tuesday, 09 March 2010 06:13 |
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One seemingly insurmountable obstacle to the dream of virtually limitless yields of staple crops like corn, wheat and rice is the dependence of those plants on sexual reproduction. When male and female gametes -- sperm and egg -- combine randomly to generate a genetically unique seed, valuable parental traits painstakingly selected by breeders are erased. But what if plants like these could be engineered to reproduce asexually -- an abilty of a subset of plants, for example the common dandelion? |
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Tuesday, 09 March 2010 05:09 |
The exploits of China's first emperor, Qin Shihuangdi, are richly documented in 2,000-year-old records of his conquests across eastern China. His reign was indeed noteworthy -- he is responsible for initiating construction of the Great Wall, and the discovery of life-size terracotta soldiers that guard his tomb in central China has generated worldwide attention.
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Saturday, 06 March 2010 03:03 |
At the end of the last interglacial epoch, around 115,000 years ago, there were significant climate fluctuations. In Central and Eastern Europe, the slow transition from the Eemian Interglacial to the Weichselian Glacial was marked by a growing instability in vegetation trends with possibly at least two warming events. |
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Saturday, 06 March 2010 02:56 |
Understanding how past climate may have influenced human evolution could be dramatically enhanced by an international cross-disciplinary research program to improve the sparse human fossil and incomplete climate records and examine the link between the two, says a new report from the National Research Council.
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Thursday, 04 March 2010 04:44 |
A fossil that was celebrated last year as a possible "missing link" between humans and early primates is actually a forebearer of modern-day lemurs and lorises, according to two papers by scientists at The University of Texas at Austin, Duke University and the University of Chicago.
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Thursday, 04 March 2010 01:33 |
Giant plankton-eating fishes roamed the prehistoric seas for over 100 million years before they were wiped out in the same event that killed off the dinosaurs, new fossil evidence has shown.
An international team describe how new fossils from Asia, Europe and the US reveal a previously unknown dynasty of giant plankton-eating bony fishes that filled the seas of the Jurassic and Cretaceous periods, between 66-172 million years ago. |
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Tuesday, 02 March 2010 02:01 |
A laser technique best known for its use to remove unwanted tattoos from the skin is finding a second life in preserving great sculptures, paintings and other works of art, according to an article in the American Chemical Society's monthly journal, Accounts of Chemical Research.
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Tuesday, 02 March 2010 01:55 |
DNA recovered from ancient caribou bones reveals a possible link between several small unique caribou herds and a massive volcanic eruption that blanketed much of the Alaskan Yukon territory in a thick layer of ash 1,000 years ago, reports research published in Molecular Ecology.
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Saturday, 27 February 2010 05:47 |
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In 1871, Charles Darwin puzzled over the evolution of altruism. "He who was ready to sacrifice his life, as many a savage has been," he wrote in The Descent of Man, "rather than betray his comrades, would often leave no offspring to inherit his noble nature."
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Saturday, 27 February 2010 05:43 |
Since the dawn of the biological sciences, humankind has struggled to comprehend the relationships among the major groups of "jointed-legged" animals -- the arthropods. Now, a team of researchers, including Dr. Joel Martin and Dr. Regina Wetzer from the Natural History Museum of Los Angeles County (NHM), has finished a completely new analysis of the evolutionary relationships among the arthropods, answering many questions that defied previous attempts to unravel how these creatures were connected. |
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Tuesday, 09 March 2010 05:11 |
One of the biggest questions facing scientists today is how life began. How did non-living molecules come together in that primordial ooze to form the polymers of life? Scientists at the Georgia Institute of Technology have discovered that small molecules could have acted as "molecular midwives" in helping the building blocks of life's genetic material form long chains and may have assisted in selecting the base pairs of the DNA double helix.
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Tuesday, 09 March 2010 05:06 |
A team of scientists has discovered that the drastic decline in Arctic musk ox populations that began roughly 12,000 years ago was due to a warming climate rather than to human hunting.
"This is the first study to use ancient musk ox DNA collected from across the animal's former geographic range to test for human impacts on musk ox populations," said Beth Shapiro, the Shaffer Career Development assistant professor of biology at Penn State University and one of the team's leaders. |
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Saturday, 06 March 2010 03:00 |
A colossal red granite head of ancient Egypt's King Amenhotep III (circa 1390-1352 BC) has been discovered in his funerary temple of the Kom El -Hettan area on Luxor's West Bank.
Egypt's Culture Minister, Farouk Hosni, announced the discovery, which was carried out by the Colossi of Memnon and Amenhotep III Temple Conservation Project, a multi-national Egyptian-European team. |
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Saturday, 06 March 2010 02:52 |
Did women and men contribute equally to the lineage of contemporary populations? Did our ancestors, Homo sapiens, lean more toward polygamy or monogamy? To answer these questions, Dr. Damian Labuda, an investigator at the Sainte-Justine University Hospital Research Center and a professor at the Department of Pediatrics of the Université de Montréal, headed a team that analyzed genomic data from three population samples of African, Asian and European origin. |
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Thursday, 04 March 2010 04:42 |
Until now, paleontologists have generally believed that the closest relatives of dinosaurs possibly looked a little smaller in size, walked on two legs and were carnivorous. However, a research team including Randall Irmis, curator of paleontology at the Utah Museum of Natural History and assistant professor in the Department of Geology and Geophysics at the University of Utah has made a recent discovery to dispel this hypothesis.
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Thursday, 04 March 2010 01:31 |
Newly discovered archaeological sites in southern and northern India have revealed how people lived before and after the colossal Toba volcanic eruption 74,000 years ago.
The international, multidisciplinary research team, led by Oxford University in collaboration with Indian institutions, unveiled to a conference in Oxford what it calls 'Pompeii-like excavations' beneath the Toba ash. |
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Tuesday, 02 March 2010 01:59 |
Scientists at the University of Liverpool have provided the first experimental evidence that shows that evolution is driven most powerfully by interactions between species, rather than adaptation to the environment.
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Tuesday, 02 March 2010 01:54 |
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Scientists at the University of Liverpool have provided the first experimental evidence that shows that evolution is driven most powerfully by interactions between species, rather than adaptation to the environment. The team observed viruses as they evolved over hundreds of generations to infect bacteria. |
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Saturday, 27 February 2010 05:45 |
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University of Oregon labs combine emerging technologies to identify gene regions underlying adaptation
Twenty billion pieces of DNA in 100 small fish have opened the eyes of biologists studying evolution. After combining new technologies, researchers now know many of the genomic regions that allowed an ocean-dwelling fish to adapt to fresh water in several independently evolved populations. |
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Saturday, 27 February 2010 05:41 |
Aphids could be considered the "mosquitoes" of the plant world, depending on the "blood" of plants to survive. They live in symbiosis with bacteria that pass from one generation to the next, producing essential amino acids. Aphids with the same genotype can be wingless or winged. In different seasons, they develop as asexual females who produce offspring with identical genes through parthenogenesis. When temperatures drop, they can give birth to males who then fertilize the eggs laid by females. |
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