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thinkahol *

Dogs Decoded | Watch Free Documentary Online - 6 views

topdocumentaryfilms.com/dogs-decoded

Dogs Decoded | Watch Free Documentary Online

shared by thinkahol * on 03 Feb 11 - No Cached
  • thinkahol * on 03 Feb 11
     
    Dogs Decoded reveals the science behind the remarkable bond between humans and their dogs and investigates new discoveries in genetics that are illuminating the origin of dogs - with surprising implications for the evolution of human culture. Other research is proving what dog lovers have suspected all along: Dogs have an uncanny ability to read and respond to human emotions. Humans, in turn, respond to dogs with the same hormone responsible for bonding mothers to their babies. How did this incredible relationship between humans and dogs come to be? And how can dogs, so closely related to fearsome wild wolves, behave so differently?
Mike Chelen

RNA world easier to make : Nature News - 0 views

www.nature.com/...news.2009.471.html

rna

shared by Mike Chelen on 15 May 09 - No Cached
  • John Sutherland and his colleagues from the University of Manchester, UK
  • ribonucleotide
  • building block of RNA
  • ...29 more annotations...
  • Donna Blackmond, a chemist at Imperial College London.
  • strong evidence for the RNA world
  • 'RNA world' hypothesis, which suggests that life began when RNA, a polymer related to DNA that can duplicate itself and catalyse reactions
  • chemists had thought the subunits would probably assemble themselves first, then join to form a ribonucleotide
  • three distinct parts: a ribose sugar, a phosphate group and a base
  • RNA polymer is a string of ribonucleotides
  • efforts to connect ribose and base together have met with frustrating failure
  • researchers have now managed to synthesise
  • ribonucleotides
  • remedy is to avoid producing separate ribose-sugar and base subunits
  • makes a molecule whose scaffolding contains a bond that will
  • be the key ribose-base connection
  • atoms are then added around this skeleton
  • final connection is to add a phosphate group
  • influences the entire synthesis
  • acting as a catalyst, it guides small organic molecules into making the right connections
  • What we have ended up with is molecular choreography
  • objectors to the RNA-world theory say the RNA molecule as a whole is too complex to be created using early-Earth geochemistry
  • flaw is in the logic — that this experimental control by researchers in a modern laboratory could have been available on the early Earth
  • Robert Shapiro, a chemist at New York University
  • early-Earth scenarios
  • heating molecules in water, evaporating them and irradiating them with ultraviolet light
  • results showing that they can string nucleotides together
  • ultimate goal is to get a living system (RNA) emerging from a one-pot experiment
  • need to know what the constraints on the conditions are first
  • Shapiro sides with
  • another theory of life's origins
  • because RNA is too complex to emerge from small molecules, simpler metabolic processes
  • eventually catalysed the formation of RNA and DNA
Walid Damouny

Diamond coatings are branching out - physicsworld.com - 0 views

physicsworld.com/...39979

PhysicsWorld.com Adamant physics chemistry carbon diamond amorphous crystals crystalline atomic bonds

shared by Walid Damouny on 26 Aug 09 - Cached
  • Walid Damouny on 26 Aug 09
     
    Chris Walker looks at some of the uses of a novel amorphous diamond material.
Ivan Pavlov

Can strong parental bond protect infants down to their DNA? -- ScienceDaily - 0 views

www.sciencedaily.com/...140722101912.htm

science news

shared by Ivan Pavlov on 29 Jul 14 - No Cached
  • Ivan Pavlov on 29 Jul 14
     
    Drury, a geneticist, is a pioneer in new research exploring the biological impacts of early adversity on children. She is the first scientist to show that extreme stress in infancy can biologically age a child by shortening the tips of chromosomes, known as telomeres. These caps keep chromosomes from shrinking when cells replicate. Shorter telomeres are linked to higher risks for heart disease, cognitive decline, diabetes and mental illness in adults.
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