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Tag: "ancient" at biology news

Did humans cause ecosystem collapse in ancient Australia?

... of animals and the arrival of the first humans in ancient Australia may be linked, according to scientists a... evidence of diet and the environment contained in ancient eggshells and wombat teeth over the last 140,000 years to reconstruct what happened. The remains sho...

“Hitchhiking?Viruses as Cancer Drug Delivery System

...equire such massive chewing abilities. While our ancient ancestors may have left the rain forest for the savannah in pursuit of game meat, it was the ability to find and eat roots that may have contributed to the initial split between humans and the other apes. Laden and Wrangham's paper is available at w...

The roots of civilization trace back to ... roots

...equire such massive chewing abilities. While our ancient ancestors may have left the rain forest for the savannah in pursuit of game meat, it was the ability to find and eat roots that may have contributed to the initial split between humans and the other apes. Laden and Wrangham's paper is available at w...

World-first technology enables study of ancient bacteria

...ble energy sources from the ocean bed by isolating ancient high-pressure bacteria from deep sediments. Scien...d enable his team to grow, isolate and study these ancient bacteria in the laboratory. "DNA analysis of deep sediments has shown diverse bacterial populations...

Ancient DNA confirms single origin of Malagasy primates

...mountain evidence that suggests that prospects for ancient DNA studies from the tropics are less promising than those from higher latitudes, but when the results are potentially of such compelling interest, it's always worth a try," she said. ...

Neanderthal teeth grew no faster than comparable modern humans'

Recent research suggested that ancient Neanderthals might have had an accelerated childhood compared to that of modern humans but that seems flawed, based on a new assessment by researchers from Ohio State University and the University of Newcastle . They found that the rate of tooth gr...

Virginia Tech, Nanjing Institute researchers discover half-billion year-old fossils

Scientists interested in ancient life have a wealth of fossils and impressions frozen in rocks that they can study from as far back as 540 million years ago ?when animals with shells and bones began to become plentiful. But evidence of complex life older than 540 million years is sc...

Researchers create functioning artificial proteins using nature's rules

...d is the body of information that is fundamentally ancient within each protein family, and that information is enough to specify the structure of modern-day proteins," Dr. Ranganathan said. He and his team tested their newly discovered "rules" gleaned from the evolutionary record by feeding them into a comp...

Lands surface change on Alaska tundra creating longer, warmer summers in Arctic

...owth. Over time, as the permafrost begins to melt, ancient organic matter that has been frozen for thousands of years is exposed, potentially adding more carbon dioxide to the atmosphere. The result is a positive feedback loop that could continue to raise temperatures in the region and further lengthen the ...

Marine bacterium suspected to play role in global carbon and nitrogen cycles

...aps revising, their thinking about how Archaea, an ancient kingdom of single-celled microorganisms, are involved in maintaining the global balance of nitrogen and carbon. Researchers have discovered the first Archaea known to oxidize ammonia for energy and metabolize carbon dioxide by successfully growing t...

Study: Predatory dinosaurs had bird-like pulmonary system

...is week's issue of the journal Nature suggests the ancient beasts boasted a much bigger, more complex system ...n, D.C., Berlin and London to examine the bones of ancient beasts, and also studied a 67-million-year-old dinosaur, Majungatholus atopus, that O'Connor had dis...

Researchers identify new catfish family

...ly and show that the fish is the only member of an ancient group that may have arisen while dinosaurs roamed the Earth. The fish's skeleton was scanned by high-resolution computer tomographic equipment at The University of Texas at Austin. "To most people it's just a catfish, and externally it looks a lot ...

Cultural norms not unique to human societies

...volutionary progression. "These results suggest an ancient origin for the cultural conformism that is so evident in humans," said de Waal. "Further research may reveal these findings to be more widespread throughout the animal kingdom." ...

Analysis of flower genes reveals the fate of an ancient gene duplication

In a step that advances our ability to discern the ancient evolutionary relationships between different genes...s and Antirrhinum. The other genes created in that ancient gene-duplication event became altered, in different ways, so that they now have new functions in Ara...

Scientists find microRNAs regulate plant development

...ating that the RNA-induced silencing complex is of ancient evolutionary origin, and that microRNA-mediated regulation of gene expression is shared among many eukaryotes. Arabidopsis ago1 mutants lacking the AGO1 protein have numerous severe developmental defects, supporting the notion that regulation by micr...

Decisions, decisions: Male or female?

.... "Evolutionarily, germ cells are one of the most ancient cell types, needed by every type of animal to reproduce," Van Doren said. "Their developmental program is very similar, whether we are talking fruit flies or humans. As a result, these findings could eventually help us understand and treat defects in...

International Team Determines Geographic Origin of Leprosy

...vered clues to the origin of a disease that, since ancient times, has been one of the most stigmatizing," notes NIAID Director Anthony S. Fauci, M.D. "Their findings may help public health officials better track and treat leprosy, which remains a significant problem in some parts of the world today." The re...

Scripps research scientists solve structure of a critical innate immune system protein

...ime, we survive. We survive because we possess an ancient and crucial defense mechanism known as innate immune system, which is active in eukaryotic organisms as diverse as humans and fruit flies. Broadly speaking, the innate immune system works something like this. Certain cells have the ability to recogni...

Stem cells grown in lab mirror normal developmental steps

...bration of carbon-containing compounds produced by ancient sea surface algae that were recently isolated in deep sea drill cores. The data indicates that between 45 - 34 million years ago the atmospheric carbon dioxide level was up to five times greater than today, with a sharp decrease and then stabilizati...

Invasive parasite destroying fish species

...bration of carbon-containing compounds produced by ancient sea surface algae that were recently isolated in deep sea drill cores. The data indicates that between 45 - 34 million years ago the atmospheric carbon dioxide level was up to five times greater than today, with a sharp decrease and then stabilizati...

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