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John Lemke

DNA from maggot guts used to identify corpse in criminal case | Ars Technica - 0 views

arstechnica.com/...entify-corpse-in-criminal-case

2012 maggot corpse criminal dna forensic crime investigation murder identificaton

shared by John Lemke on 29 Sep 12 - No Cached
  • It had already been suggested by other researchers that the gastrointestinal contents of maggots could be used to identify the subjects they feed on. However, never before has the theory been trialed in a legal, criminal case. Pathologists at Autonomous University of Nuevo León in San Nicolás, Mexico, led by María de Lourdes Chávez-Briones and Marta Ortega-Martínez, carried out short tandem repeat typing tests (a common method of DNA profiling) on the matter extracted from three dissected maggots found on the victim's face and neck, and separately on the alleged father of the missing woman. Preliminary results showed that the body was female, and the final outcome was a 99.685 percent probability of positive paternity—the victim had been identified.
  • John Lemke on 29 Sep 12
     
    "It had already been suggested by other researchers that the gastrointestinal contents of maggots could be used to identify the subjects they feed on. However, never before has the theory been trialed in a legal, criminal case. Pathologists at Autonomous University of Nuevo León in San Nicolás, Mexico, led by María de Lourdes Chávez-Briones and Marta Ortega-Martínez, carried out short tandem repeat typing tests (a common method of DNA profiling) on the matter extracted from three dissected maggots found on the victim's face and neck, and separately on the alleged father of the missing woman. Preliminary results showed that the body was female, and the final outcome was a 99.685 percent probability of positive paternity-the victim had been identified."
John Lemke

Scientists create the first life form with 'alien' DNA | The Verge - 0 views

www.theverge.com/...orm-with-alien-dna-six-letters

scientists DNA genetics 2014 gene-splicing muttation life indienationnews

shared by John Lemke on 08 May 14 - No Cached
  • genetic code comprises six letters, instead of four
  • the bacteria appear to be reproducing normally and passing on the new X-Y pair to their offspring.
  • t probably wouldn't survive for very long, Romesberg said, because it needs to feed on synthetic molecules to replicate — molecules that only the scientists can supply.
John Lemke

Force of nature gave life its asymmetry : Nature News & Comment - 0 views

www.nature.com/...ave-life-its-asymmetry-1.15995

2014.09.29-TNN DNA indienationnews life nature

shared by John Lemke on 26 Sep 14 - No Cached
  • In an experiment that took 13 years to perfect1, the researchers have found that these electrons tend to destroy certain organic molecules slightly more often than they destroy their mirror images.
  • The weak nuclear force, which is involved in nuclear decay, is the only force of nature known to have a handedness preference: electrons created in the subatomic process known as β decay are always 'left-handed'. This means that their spin — a quantum property analogous to the magnetization of a bar magnet — is always opposite in direction to the electron's motion.
  • In all cases the asymmetry was tiny, but consistent, like flipping a not-quite-fair coin. “The scale of the asymmetry is as though we flip 20,000 coins again and again, and on average, 10,003 of them land on heads while 9,997 land on tails,” says Dreiling.
John Lemke

BBC News - Deep sea 'mushroom' may be new branch of life - 0 views

www.bbc.com/...science-environment-29054889

indienationnews 2014 biology zooology science new discovery news

shared by John Lemke on 04 Sep 14 - No Cached
  • The authors of the article note several similarities with the bizarre and enigmatic soft-bodied life forms that lived between 635 and 540 million years ago - the span of Earth history known as the Ediacaran Period.
  • The authors of the paper recognise two new species of mushroom-shaped animal: Dendrogramma enigmatica and Dendrogramma discoides.
  • The new organisms are multicellular but mostly non-symmetrical, with a dense layer of gelatinous material between the outer skin cell and inner stomach cell layers. The researchers did find some similarities to other animal groupings, such as the Cnidaria - the phylum that comprises corals and jellyfish - and the Ctenophora, which includes the marine organisms known as comb jellies. But the new organisms did not fulfil all the criteria required for inclusion in either of those categories.
  • ...1 more annotation...
  • One way to resolve the question surrounding Dendrogramma's affinities would be to examine its DNA, but new specimens will need to be found. The original samples were first preserved in formaldehyde and later transferred to 80% alcohol, a mode of treatment that prevents analysis of genetic material.
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