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Tag: "dated" at biology news

Hofmeyr skull supports the 'Out of Africa' theory

Reliably dated fossils are critical to understanding the course o...n New York published today in Science magazine has dated the skull to 36,000 years ago. This skull provides critical corroboration of genetic evidence indica...

40,000-year-old skull shows both modern human and Neandertal traits

... of the cave, adjacent to the excavation area, and dated to about 40,500 years ago ?lead the team to conclude that the two fossils were the same age. These are the earliest modern human remains so far found in Europe and represent our best evidence of what the modern humans who first dispersed into Europe...

Ultrasound upgrade produces images that work like 3-D movies

...ings in an issue of the journal Ultrasonic Imaging dated July 2006, but published in April 2007. The research was supported by the National Institutes of Health. Human depth perception is largely the result of stereo vision -- the slightly different perspectives of the same scene that are observed by th...

Ladybugs may be cute, but watch out when they get near wine

...1972 by Dr. Leakey, who reassembled it by hand and dated it at nearly three million years of age, an estimate revised to 1.9 million years by scientists who later discovered problems with the dating. "Dr. Leakey produced a biased reconstruction based on erroneous preconceived expectations of early hum...

Man's earliest direct ancestors looked more apelike than previously believed

...1972 by Dr. Leakey, who reassembled it by hand and dated it at nearly three million years of age, an estimate revised to 1.9 million years by scientists who later discovered problems with the dating. "Dr. Leakey produced a biased reconstruction based on erroneous preconceived expectations of early hum...

Reef warns of sea level rise

...emperatures rise during the 21st century. "We've dated the reef to about 128-125,000 years ago, right in the middle of the last interglacial, or the last period of global warming before our most recent ice age," says Professor Malcolm McCulloch, deputy director of CoECRS and an earth scientist at The Aus...

Two studies on bee evolution reveal surprises

...llion years ago -- but previous bee fossil records dated back only about 65 million years. Danforth and Poi... has been a mystery why the bee fossil record only dated back about 65 million years. Until now, many researchers believed the most primitive bees stemmed...

Ancient ape ruled out of man's ancestral line

...ts from immediately above and below the body, they dated the skeleton at around 2.2 million years old. Their findings, published in the American journal Science, are controversial. Earlier estimates had put the age of Little Foot at three to four million years old placing it potentially on a direct line...

Coral stress 'like never in history'

...s had occurred in the history of these reefs which dated back as far as 11 000 years ago. "The sequence of fossils is like a three dimensional movie of what happened in the reefs?past," says Pandolfi. Over the 6000 years recorded in the fossil strata the team found 4 devastating events which result...

New dwarf buffalo discovered by chance in the Philippines

... bone, and two hoof bones. The fossil could not be dated with certainty, but the authors estimate that it probably lived during the Pleistocene ("Ice Age"), probably between 10,000 and 100,000 years ago, but it is possible that it is younger. The discovery demonstrates that there are fossils to be found...

Hair samples show babies can be exposed to 'crystal meth' while in the womb

...ent for analysis in 2005. The first positive cases dated from 2003. Wide ranging levels of the drug were found in both the mothers' and the newborns' hair samples. But the levels matched, indicating that the drug is able to cross the placenta directly to the developing fetus, say the authors. Only ...

Sociality of sweat bees evolved simultaneously during climate change

...ty in halictid bees was so recent." Once the team dated the evolution of the social behaviors to just 20 million to 22 million years ago, they researched what might have been going on in this time frame that would trigger the development of social behavior in so many species at the same time. "We discove...

Ahead of the game

...-Paleolithic rock shelter in the Georgian Republic dated to 60,000?0,000 years ago to contest some prior models of the perceived behavioral and cognitive differences between Neanderthals and modern humans. Instead, the researchers suggest that developments in the social realm of modern human life, allowing...

Typhoid fever led to the fall of Athens

...d in the Kerameikos ancient cemetery of Athens and dated back to the time of the historical outbreak, provided the required skeletal material for the investigation of ancient microbial DNA. Aided by modern DNA recovery and amplification techniques, Papagigorakis et al used dental pulp to identify DNA sequ...

Rare Tibetan antelope listed as endangered

... Imaging, which was issued in late March 2006, but dated July 2005. The research was supported by the National Institutes of Health and the National Science Foundation. "Surgeons now use optical endoscopes or two-dimensional ultrasound when conducting minimally invasive surgery," said lead engineer Stephe...

3D ultrasound device poised to advance minimally invasive surgery

... Imaging, which was issued in late March 2006, but dated July 2005. The research was supported by the National Institutes of Health and the National Science Foundation. "Surgeons now use optical endoscopes or two-dimensional ultrasound when conducting minimally invasive surgery," said lead engineer Stephe...

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

...ia Gonzalez of Liverpool's John Moores University, dated the volcanic rock at 40,000 years old. They hypothesized that early hunters walked across ash freshly deposited near a lake by volcanoes that are still active in the area around Puebla, Mexico. The so-called footprints, subsequently covered by more a...

Ancient anthropoid origins discovered in Africa

...2 lie nearly 750 feet below those of L-41 and were dated at around 37 million years old by measuring telltale variations in magnetic fields in the sediments due to ancient fluctuations in the earth's magnetic fields. According to Simons, other anthropoids exist at BQ-2 and will soon be described, The late...

Oldest dated evidence of cattle in southern Africa found

...uthern Africa and from where. A domestic cow bone, dated to about 2000 years ago was excavated from a site ...e Kalahari Desert of northern Botswana. This bone, dated by the Accelerator Mass Spectrometry (AMS) radiocarbon technique, provides the oldest directly dated...

Amazon source of 5-year-old river breath

...apid recycling of forest carbon because they never dated the invisible greenhouse gas as it is literally exhaled by the river organisms." "River breath is much deeper and faster than anyone realized," says Jeff Richey, UW oceanographer and another co-author. Carbon is carried by rains and groundwater int...

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