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Tag: "date" at biology news

Study casts doubt on 'Snowball Earth' theory

...s also may argue that the rocks do not necessarily date to a glacial era, Olcott said. But her team found evidence of glacial activity in the samples, such as dropstones (continental rocks dropped by melting glaciers into marine deposits) and glendonites (minerals that only form in near-freezing water). ...

Elusive salamanders have role in developing new sampling models

...apped. In subsequent sampling she has extended the date of recorded residence by larval flatwoods salamanders in Fort Stewart ponds by two to three weeks, which is well beyond the period when experts thought they normally leave ponds. One of the project tasks consists of field experimentation to compare ...

Study shows big game hunters, not climate change, killed off sloths

...bout 11,000 years ago. But by using radiocarbon to date fossils from Cuba and Hispaniola, where humans appeared later than on the North American continent, long after the last Ice Age occurred, UF ornithologist David Steadman was able to separate the two events. He and his colleagues found the last recor...

Human cerebellum and cortex age in very different ways

...e in Leipzig, Germany, is one of many conducted to date on the question of how gene expression changes across the human lifespan, but the first to examine how the two major brain areas age differently. Scientists had also not previously compared the effects of aging on the brains of humans and other prima...

Oldest dated evidence of cattle in southern Africa found

...nd the new dates of about 2000 years ago appear to date the initial penetration of livestock through this zone. ...

Solexa and collaborating scientists illuminate the small RNA component of the transcriptome

...laware reported the most comprehensive analysis to date of the small RNA component of the transcriptome. The research, "Elucidation of the Small RNA Component of the Transcriptome," was published in the September 2, 2005 issue of the peer-reviewed journal Science. Solexa's assay can be used to elucidate s...

Restaurant seafood prices since 1850s help plot marine harvests through history

...ants. Abalone does not appear on menus examined to date from the 1870's to the early 1920's. From the early 1920's to the late 1930's the price closely tracked the Consumer Price Index (CPI). This inflation-adjusted chart shows prices flat at a 2004 equivalent of about $7.00 until the late 1930's and a se...

Cornell finds natural selection in humans

The most detailed analysis to date of how humans differ from one another at the DNA level shows strong evidence that natural selection has shaped the recent evolution of our species, according to researchers from Cornell University, Celera Genomics and Celera Diagnostics. In a study...

Zebrafish may hold key to improved cancer research

...n leukemias. OSU's fish disease research programs date back several decades, and the university first developed the rainbow trout as a useful model for cancer research. Those studies, among others, helped to determine that aflatoxin contaminants which can be found in some foods are a powerful carcinogen ...

Biotech cotton 8: Bugs 0

... insecticide. "This is the most complete study to date for monitoring resistance to Bt crops," said team leader Bruce E. Tabashnik, the head of UA's department of entomology, a member of UA's BIO5 Institute and an expert in insect resistance to insecticides. "We found no net increase in insect resistanc...

Science's Breakthrough of the Year: Watching evolution in action

...d another international effort, the biggest map to date of single-letter variations in the human genetic s... Close-up: The most detailed molecular portrait to date of a voltage-gated potassium channel was unveiled in 2005. These channels, gatekeeper proteins that ...

Scientists narrow the time limits for the human and chimpanzee split

...o establish how fast genes mutate in humans and to date the historical spread of our species around the gl... -- 35 million years ago. Calculations using this date yielded a time for the human-chimp split of approximately 7 million years ago, which again was propo...

Genes involved in biofilms

...ureus biofilm. Regulating mechanisms unknown to date The starting point for the research was the Bap ...iofilms. Two new genes The results obtained to date intuitively suggest the existence of various mechanisms for forming biofilm as a function of the ori...

Students discover 11,000 year old remains of Irish Elk

...n, high up in the kettle hole, may provide a later date for the presence of giant deer on the island than previous studies. The antler, dubbed 'Erica the Elk' by the students, will be presented to the Manx Museum. ...

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

...rlier than 11,000 years ago, which is the accepted date for the arrival of humans across a northern land-b... sealed within the ash." Renne determined the new date using the argon/argon dating technique, which reliably dates rock as young as 2,000 years or as old ...

Carnegie Mellon scientists show brain uses optimal code for sound

...lish language." "Our work is the only research to date that efficiently processes auditory code as kernalized spikes," said Evan Smith, a graduate student in psychology at the CNBC. Until now, scientists and engineers have relied on Fourier transformations--initially discovered 200 years ago--to separa...

Learning to love bacteria: Stanford scientist highlights bugs' benefits

... act appropriately?" he asked. The only answer to date is: "It's complicated." Instead of a persistent infection, some people get very ill from organisms such as Salmonella, H. pylori, tuberculosis and meningitis. How the immune system responds differently in individuals demands further research. Falkow...

Scientists look to the Bahamas as a model for coral reef conservation

... act appropriately?" he asked. The only answer to date is: "It's complicated." Instead of a persistent infection, some people get very ill from organisms such as Salmonella, H. pylori, tuberculosis and meningitis. How the immune system responds differently in individuals demands further research. Falkow...

Mouse study reveals human X-SCID gene therapy poses substantial cancer risk

...show that the only human gene therapy treatment to date considered to be largely successful, is, in fact, ... been solved. The French trial is the largest to date to test IL2RG gene therapy, and of the 10 children treated, nine were successfully cured of X-SCID, ...

Sustainable farm practices improve Third World food production

...Technology . The study, the largest of its kind to date -- 286 farm projects in 57 countries -- concludes that sustainable agriculture protects the environment in these countries while substantially improving the lives of farmers who adopt the resource-conserving practices. Yields increased by an average...

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