Linked Life Data

19185874

Source:http://linkedlifedata.com/resource/pubmed/id/19185874

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2009-3-23
pubmed:abstractText
Amino acid-smectite interaction may have catalyzed prebiotic reactions essential for the emergence of life. Lysine solutions (0.05 M) were reacted with Na-smectite in adsorption-desorption experiments. The lysine-smectite complexes were heated at 80 degrees C for 10 days to investigate (1) possible slow processes taking place at surface temperature that would be accelerated at higher temperature and (2) processes taking place in hydrothermal systems. Three sets of experiments were performed: thermal treatment in closed tubes and water added regularly; thermal treatment in closed tubes without adding water; and thermal treatment in open tubes and no added water. After lysine desorption (displacement with 0.1 M CaCl(2)), the solutions were investigated using circular dichroism (CD) and the smectite samples using FTIR and CHN elemental analysis. CD spectra were dependent on the solution pH, which was controlled by lysine protonation state. The lysine protonation state was altered by the adsorption-desorption process, with a higher Lys(+)/Lys(+/-) ratio after desorption. The CD and CHN analyses show that the thermal treatment in a moist state causes stronger smectite-lysine binding. FTIR data suggest that the stronger binding is caused by more or stronger H bonds between -NH(3)(+) lysine groups and smectite basal O atoms.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
1095-7103
pubmed:author
pubmed:issnType
Electronic
pubmed:day
1
pubmed:volume
333
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
78-84
pubmed:dateRevised
2009-11-11
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Reactions of lysine with montmorillonite at 80 degrees C: implications for optical activity, H+ transfer and lysine-montmorillonite binding.
pubmed:affiliation
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK. j.cuadros@nhm.ac.uk
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't