Linked Life Data

9735034

Source:http://linkedlifedata.com/resource/pubmed/id/9735034

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5380
pubmed:dateCreated
1998-9-8
pubmed:abstractText
Nanometer-size presolar diamonds from the Efremovka CV3 chondrite were physically separated into several grain size fractions by ultracentrifugation. The coarsest size fraction is the most enriched in carbon-12; the others have broadly similar carbon isotopic compositions. Measurement of noble gases shows that their concentration decreases with decreasing grain size. This effect is attributed to ion implantation. Such an episode could occur in the envelope of a supernova that produced the diamonds, or in interstellar space; in either case, ions with energies above a certain threshold pass completely through the smaller diamond grains without being captured. Concentrations of nitrogen show only minor variations with grain size, indicating a different mechanism of incorporation into the diamonds.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0036-8075
pubmed:author
pubmed:issnType
Print
pubmed:day
21
pubmed:volume
281
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1165-8
pubmed:dateRevised
2007-3-19
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
C, N, and noble gas isotopes in grain size separates of presolar diamonds from Efremovka.
pubmed:affiliation
Planetary Sciences Research Institute, Open University, Walton Hall, Milton Keynes, UK.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't