News tagged with molecular clock
Earth history and evolution
In classical mythology, the cypress tree is associated with death, the underworld and eternity. Indeed, the family to which cypresses belong, is an ancient lineage of conifers, and a new study of their evolution affords a ...
May 03, 2012 |
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Diversification of land plants
Researchers have reconstructed phylogenetic relationships among all 706 families of land plants.
Apr 05, 2012 |
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Molecular path from internal clock to cells controlling rest and activity revealed in new study
(PhysOrg.com) -- The molecular pathway that carries time-of-day signals from the body's internal clock to ultimately guide daily behavior is like a black box, says Amita Sehgal, PhD, the John Herr Musser Professor ...
Feb 07, 2012 |
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Namibia sponge fossils are world's first animals: study
Scientists digging in a Namibian national park have uncovered sponge-like fossils they say are the first animals, a discovery that would push the emergence of animal life back millions of years.
Other Sciences / Archaeology & Fossils
Feb 06, 2012 |
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Nobel Prize-winning physicist Norman Ramsey dies
(AP) -- Norman Ramsey, who shared the 1989 Nobel Prize in physics for his research into molecules and atoms that led to the creation of the atomic clock, has died in Massachusetts. He was 96.
Nov 07, 2011 |
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Long-held belief debunked: Cycad is not a 'Dinosaur Plant'
(PhysOrg.com) -- The widely held belief today's cycads are 'dinosaur plants' and were around during dinosaur times has been categorically debunked in a breakthrough study of international significance.
Oct 20, 2011 |
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A living species of aquatic beetle found in 20-million-year-old sediments
The fossil beetle discovered in the 16-23 million years old sediments of the Irtysh River in southern Siberia belongs to the modern species Helophorus sibiricus, a member of the water scavenger beetles (Hydro ...
Other Sciences / Archaeology & Fossils
Oct 06, 2011 |
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Circadian clocks in a blind fish
Do animals that have evolved for millions of years underground, completely isolated from the day-night cycle, still "know" what time it is? Does a normal circadian clock persist during evolution under constant darkness? A ...
Sep 06, 2011 |
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Rocks and clocks help unravel the mysteries of ancient Earth
(PhysOrg.com) -- Research into the dating techniques used to identify the origins of the living world has found the way in which fossils are used to calibrate the Earth’s evolutionary clock is of critical ...
Other Sciences / Archaeology & Fossils
Aug 25, 2011 |
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'Wrong'-time eating reduces fertility in fruit flies
Dieticians will tell you it isn't healthy to eat late at night: it's a recipe for weight gain. In fruit flies, at least, there's another consequence: reduced fertility.
Jun 07, 2011 |
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Experimental work proves theory that circadian body clock requires delay to function properly
For more than 20 years, theoretical mathematical models have predicted that a delay built into a negative feedback system is at the heart of the molecular mechanism that governs circadian clocks in mammalian ...
Mar 25, 2011 |
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Scientists pinpoint link between light signal and circadian rhythms
In a new paper published this week in the Proceedings of the National Academy of Sciences, Aziz Sancar, MD, PhD, the Sarah Graham Kenan Professor of Biochemistry and Biophysics in the UNC School of Medicine, and his collea ...
Dec 29, 2010 |
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Why the biological clock? Study says aging reduces centromere cohesion, disrupts reproduction
University of Pennsylvania biologists studying human reproduction have identified what is likely the major contributing factor to the maternal age-associated increase in aneuploidy, the term for an abnormal ...
Sep 08, 2010 |
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Can clonal plants live forever?
Despite the many cosmetic products, surgical treatments, food supplements, and drugs designed specifically to reverse the biological effects of aging in humans, long-lived aspen clones aren't so lucky. Researchers at the ...
Aug 17, 2010 |
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Humans First Acquired Malaria Parasites 2.5 Million Years Ago
(PhysOrg.com) -- Scientists have determined the evolutionary timeline for the microscopic parasites that cause one of the world's most widespread infectious diseases: malaria.
Medicine & Health / Medical research
Jul 09, 2010 |
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