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Life as we don´t know it

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by

Raquel Martínez

on 21 October 2014

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Transcript of Life as we don´t know it

-Living organisms can appear suddenly and spontaneously from any non-living material.
-Aristotle, Descartes, Galileo, Von Helmont- rat generating soup with human sweat as an active principle.
-Disproved: Francisco Redi (1665)
-Lazzaro Spallanzani (1765)
-Louis Pasteur (1864)


Theory of special creation
-All different life forms that exist today where created by an almighty being.
-Found in ancient scriptures of most religions.
-Living organisms have not undergone any change since their creation.
-Purely religious concept acceptable only by faith but no scientific basis.
Spontaneous generation
Necropanspermia
-The majority of organisms reach the milky way in a state that is considered technically dead, BUT can somehow revive when in contact with the proper environment.
Extraterrestrial evidence?
-Most points to martian origin:
Molybdenum and boron.
Martian meteorites from Antarctica
survival of extremophiles in space
Curiosity
and
Opportunity
rovers searching for evidence.

Cosozoic origin
-Also called panspermia.
-Life reached planet from outside the solar system.
Exogenesis
ALH84001
Life as we don´t know it
disproved and non scientific theories
Theory of catastrophism
Modification of Special Creation.
Several creations preceded by a catastrophe caused by some geological disturbance.
-Geroges Cuvier!!nd Alcide d`Obringe.
Transpermia
-Life reached planet from the solar system

Earth life 'may have come from Mars' BBC - August 28, 2013
http://www.bbc.com/news/science-environment-23872765.
Power behind primordial soup discovered PhysOrg - April 4, 2013
http://phys.org/news/2013-04-power-primordial-soup.html
Is An Alien Message Embedded In Our Genetic Code? Discovery - April 1, 2013
http://news.discovery.com/space/alien-life-exoplanets/could-an-alien-message-be-embedded-in-our-genetic-code-130401.htm
Building Blocks of DNA Found in Meteorites from Space Live Science - August 8, 2011
http://www.livescience.com/15456-biological-ingredients-meteorites.html
Meteorites 'could have carried nitrogen to Earth' BBC - March 1, 2011
http://www.bbc.co.uk/news/science-environment-12597564
Life Ingredients Found in Superhot Meteorites - A First National Geographic - December 20, 2010
http://news.nationalgeographic.com/news/2010/12/101220-asteroid-meteorite-life-space-science/
'Necropanspermia' suggested as a way of seeding life on Earth PhysOrg - November 12, 2010
http://phys.org/news/2010-11-necropanspermia-seeding-life-earth.html
For your reading
Abiogenesis or Chemical Evolution

Oparin and Haldane, 1928.

• Earth's surface and atmosphere during the first billion years of existence, were radically different from that of today's conditions.
• The first life arose from a collection of chemical substances through a progressive series of chemical reactions.
• Solar radiation, heat radiated by earth and lighting must have been the chief energy source for these chemical reactions.

The Stanley Miller– Harold Urey
experiment (1953) simulated the
conditions thought at the time to
be present on the early Earth,
favoring chemical reactions that
synthesized more complex organic
compounds from simpler organic i
ntermediates.

2007: sealed vials preserved :
20 different amino acids
BUT...
Sidney W. Fox spontaneous formation of peptide structures, conditions that might plausibly have existed early in Earth's history.
He allowed amino acids to dry out as if puddled in a warm, dry spot in prebiotic conditions.
Amino acids formed long, often cross-linked, thread-like, submicroscopic polypeptide molecules now named "proteinoid microspheres
Günter Wächtershäuser and the Fe-S world
argued that some compounds come with inboard energy sources like iron sulfides that could release energy and synthesize simply organic molecules. His with Claudia Huber experiments produced small amounts of dipeptides and tripeptides.

Metabolism first
Spontaneous formation of small peptides
Full transcript