AustralieFrV1, PubMed, Corpus, bibRecord, 002114

Element substitution by living organisms: the case of manganese in mollusc shell aragonite.

Identifieur interne : 002114 ( PubMed/Corpus ); précédent : 002113; suivant : 002115

Element substitution by living organisms: the case of manganese in mollusc shell aragonite.

Auteurs : Analia L. Soldati ; Dorrit E. Jacob ; Pieter Glatzel ; Janine C. Swarbrick ; Jochen Geck

Source :

Scientific reports [ 2045-2322 ] ; 2016.

RBID : pubmed:26957325

English descriptors

KwdEn :
- Animal Shells (metabolism), Animals, Calcium (metabolism), Calcium Carbonate (metabolism), Manganese (metabolism), Mollusca (metabolism), Spectrometry, X-Ray Emission, X-Ray Absorption Spectroscopy.
MESH :
- chemical , metabolism : Calcium, Calcium Carbonate, Manganese.
- metabolism : Animal Shells, Mollusca.
- Animals, Spectrometry, X-Ray Emission, X-Ray Absorption Spectroscopy.

Abstract

Determining the manganese concentration in shells of freshwater bivalves provides a unique way to obtain information about climate and environmental changes during time-intervals that pre-date instrumental data records. This approach, however, relies on a thorough understanding of how manganese is incorporated into the shell material -a point that remained controversial so far. Here we clarify this issue, using state-of-the-art X-ray absorption and X-ray emission spectroscopy in combination with band structure calculations. We verify that in the shells of all studied species manganese is incorporated as high-spin Mn(2+), i.e. manganese always has the same valence as calcium. More importantly, the unique chemical sensitivity of valence-to-core X-ray emission enables us to show that manganese is always coordinated by a CO3-octahedron. This, firstly, provides firm experimental evidence for manganese being primarily located in the inorganic carbonate. Secondly, it indicates that the structure of the aragonitic host is locally altered such that manganese attains an octahedral, calcitic coordination. This modification at the atomic level enables the bivalve to accommodate many orders of magnitude more manganese in its aragonitic shell than found in any non-biogenic aragonite. This outstanding feature is most likely facilitated through the non-classical crystallization pathway of bivalve shells.

DOI: 10.1038/srep22514
PubMed: 26957325

Links to Exploration step

pubmed:26957325

Le document en format XML

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<author><name sortKey="Soldati, Analia L" sort="Soldati, Analia L" uniqKey="Soldati A" first="Analia L" last="Soldati">Analia L. Soldati</name>
<affiliation><nlm:affiliation>Institut für Geowissenschaften, Johannes Gutenberg-Universität, Becherweg 21, D-55099 Mainz, Germany.</nlm:affiliation>
</affiliation>
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<author><name sortKey="Jacob, Dorrit E" sort="Jacob, Dorrit E" uniqKey="Jacob D" first="Dorrit E" last="Jacob">Dorrit E. Jacob</name>
<affiliation><nlm:affiliation>Department of Earth and Planetary Sciences, Macquarie University, North Ryde NSW 2009, Australia.</nlm:affiliation>
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<author><name sortKey="Glatzel, Pieter" sort="Glatzel, Pieter" uniqKey="Glatzel P" first="Pieter" last="Glatzel">Pieter Glatzel</name>
<affiliation><nlm:affiliation>European Synchrotron Radiation Facility, F-38043 Grenoble Cedex 9, France.</nlm:affiliation>
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<author><name sortKey="Swarbrick, Janine C" sort="Swarbrick, Janine C" uniqKey="Swarbrick J" first="Janine C" last="Swarbrick">Janine C. Swarbrick</name>
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<author><name sortKey="Geck, Jochen" sort="Geck, Jochen" uniqKey="Geck J" first="Jochen" last="Geck">Jochen Geck</name>
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<author><name sortKey="Jacob, Dorrit E" sort="Jacob, Dorrit E" uniqKey="Jacob D" first="Dorrit E" last="Jacob">Dorrit E. Jacob</name>
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<author><name sortKey="Glatzel, Pieter" sort="Glatzel, Pieter" uniqKey="Glatzel P" first="Pieter" last="Glatzel">Pieter Glatzel</name>
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<author><name sortKey="Swarbrick, Janine C" sort="Swarbrick, Janine C" uniqKey="Swarbrick J" first="Janine C" last="Swarbrick">Janine C. Swarbrick</name>
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<author><name sortKey="Geck, Jochen" sort="Geck, Jochen" uniqKey="Geck J" first="Jochen" last="Geck">Jochen Geck</name>
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<term>Manganese (metabolism)</term>
<term>Mollusca (metabolism)</term>
<term>Spectrometry, X-Ray Emission</term>
<term>X-Ray Absorption Spectroscopy</term>
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<term>Calcium Carbonate</term>
<term>Manganese</term>
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<front><div type="abstract" xml:lang="en">Determining the manganese concentration in shells of freshwater bivalves provides a unique way to obtain information about climate and environmental changes during time-intervals that pre-date instrumental data records. This approach, however, relies on a thorough understanding of how manganese is incorporated into the shell material -a point that remained controversial so far. Here we clarify this issue, using state-of-the-art X-ray absorption and X-ray emission spectroscopy in combination with band structure calculations. We verify that in the shells of all studied species manganese is incorporated as high-spin Mn(2+), i.e. manganese always has the same valence as calcium. More importantly, the unique chemical sensitivity of valence-to-core X-ray emission enables us to show that manganese is always coordinated by a CO3-octahedron. This, firstly, provides firm experimental evidence for manganese being primarily located in the inorganic carbonate. Secondly, it indicates that the structure of the aragonitic host is locally altered such that manganese attains an octahedral, calcitic coordination. This modification at the atomic level enables the bivalve to accommodate many orders of magnitude more manganese in its aragonitic shell than found in any non-biogenic aragonite. This outstanding feature is most likely facilitated through the non-classical crystallization pathway of bivalve shells.</div>
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<Abstract><AbstractText>Determining the manganese concentration in shells of freshwater bivalves provides a unique way to obtain information about climate and environmental changes during time-intervals that pre-date instrumental data records. This approach, however, relies on a thorough understanding of how manganese is incorporated into the shell material -a point that remained controversial so far. Here we clarify this issue, using state-of-the-art X-ray absorption and X-ray emission spectroscopy in combination with band structure calculations. We verify that in the shells of all studied species manganese is incorporated as high-spin Mn(2+), i.e. manganese always has the same valence as calcium. More importantly, the unique chemical sensitivity of valence-to-core X-ray emission enables us to show that manganese is always coordinated by a CO3-octahedron. This, firstly, provides firm experimental evidence for manganese being primarily located in the inorganic carbonate. Secondly, it indicates that the structure of the aragonitic host is locally altered such that manganese attains an octahedral, calcitic coordination. This modification at the atomic level enables the bivalve to accommodate many orders of magnitude more manganese in its aragonitic shell than found in any non-biogenic aragonite. This outstanding feature is most likely facilitated through the non-classical crystallization pathway of bivalve shells.</AbstractText>
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<CommentsCorrectionsList><CommentsCorrections RefType="Cites"><RefSource>Acta Crystallogr B. 2005 Apr;61(Pt 2):129-32</RefSource>
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Element substitution by living organisms: the case of manganese in mollusc shell aragonite.

Element substitution by living organisms: the case of manganese in mollusc shell aragonite.

Source :

English descriptors

Abstract

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

Pour générer des pages wiki