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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

A stellar origin for the short-lived nuclides in the early Solar System

Article Abstract:

Isotopes in primitive meteorites are the decay products of short-lived nuclides in the early solar system. They are relatively abundant and provide a route to determining timescales for the formation and accretion of primitive Solar system objects. Observation os enhanced ion fluxes in a molecular could have led to models whereby the nuclides are formed by energetic particle irradiation of gas and dust. It is shown that there is link between the initial abundances of (super41)Ca and (super26)A1 samples of a primitive meteorite, indicating a common origin for the nuclides.

Author: Sahijpal, S., Goswami, J.N., Davis, A.M., Grossman, L., Lewis, R.s.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
Observations, Isotopes, Nuclides

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Alanine enantiomers in the Murchison meteorite

Article Abstract:

Alanine indigenous to the Murchison meteorite is reported by Engel and Macko to have an L-enantiomer excess of around 33%. A further analysis finds that the alanine from the interior of Murchison is racemic and it is believed that incomplete chromatographic resolution of L-alanine may have affected the enantiomer ration and the delta(super15)N results of Engel and Maco. It is concluded that evidence that L-alanine was completely resolved in their gas chromatography analyses would greatly strengthen their argument for a large excess of the L-enantiomer.

Author: Pizzarello, S., Cronin, J.R.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
Alanine

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Observations of high-velocity, weakly shocked ejecta from experimental impacts

Article Abstract:

A cratering experiment performed to study the behavior of ejecta indicates that meteorites found on earth have originated from planetary and lunar bodies. It is highly probable that these high-velocity and weakly shocked particles were ejected from the craters of planets and moons. This occurs because shock pressure rapidly decreases as the distance of the impact site increases but weakly shocked materials aree able to acquire enough velocity to escape a planet's gravity.

Author: Gratz, Andrew J., Nellis, Wiliam J., Hinsey, Neal a.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993

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Subjects list: Research, Meteorites
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