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2. (U-Th)/He Geochronology Constraints on Lateritic Duricrust Formation on the Guiana Shield

Author

Ansart, C., Quantin, C., Calmels, D., Allard, Thierry, Roig, J., Coueffe, R., Heller, B., Pinna-Jamme, R., Nouet, J., Reguer, S., Vantelon, D., Gautheron, C., Géosciences Paris Saclay (GEOPS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Synchrotron SOLEIL (SSOLEIL), and Centre National de la Recherche Scientifique (CNRS)

Subjects
(U-Th)/He dating, duricrust, Suriname, (U-Th)/He age dating, laterite, [SDE]Environmental Sciences, Guiana shield, General Earth and Planetary Sciences, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, weathering geochronology
Abstract

International audience; Thick regoliths developed under tropical climate, namely, laterites, resulting from long-term and pronounced geochemical and mineralogical rearrangement of the parent rock in response to environmental changes. Little information is available on the timing of laterite and bauxite formations, especially on the chronology of the main weathering episodes responsible for lateritic cover formation on the Guiana shield. For this purpose, we focused on both lateritic and bauxitic duricrusts developed over the Paleoproterozoic Greenstone Belt in the Brownsberg, Suriname. The duricrust samples have a relatively simple mineralogy (i.e., goethite, gibbsite, hematite, and kaolinite) but reveal, when observed at a microscopic scale, a complex history of formation with multiple episodes of dissolution/reprecipitation. The (U-Th)/He dating of 179 Fe-oxides subsamples shows that duricrusts sampled at the top of the Brownsberg plateau have ages ranging from

Published
2022
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3. Lake Erie Dental Association.

Author

Ansart, C. B., Ansart, C. B., Ansart, C. B., and Ansart, C. B.

Abstract

Editors: Aug. 1859-July 1865, J. D. White, J. H. McQuillen, G. J. Ziegler.--Aug. 1865-Dec. 1871, J. H. McQuillen, G. J. Ziegler.--Jan. 1872-May 1891, J. W. White.--July 1891-Apr. 1930, E. C. Kirk (with L. P. Anthony, Dec. 1917-Apr. 1930).--May 1930-Dec. 1936, L. P. Anthony., Vols. 1-13 are called "new series.", Merged in Jan. 1937 with: Journal of the American Dental Association, ISSN 1048-6364, to form: Journal of the American Dental Association and dental cosmos, ISSN 0375-8451., The Dental cosmos; a monthly record of dental science: Vol. XV. [Vol. 15] : Vol 15 : Issue 11, Page(s) 610, (dlps) volume: ACF8385.0015.001, (dlps) article: acf8385.0015.001:155, http://quod.lib.umich.edu/t/text/accesspolicy.html

4. Lake Erie Dental Association.

Author

Ansart, C. B., Ansart, C. B., Ansart, C. B., and Ansart, C. B.

Abstract

Editors: Aug. 1859-July 1865, J. D. White, J. H. McQuillen, G. J. Ziegler.--Aug. 1865-Dec. 1871, J. H. McQuillen, G. J. Ziegler.--Jan. 1872-May 1891, J. W. White.--July 1891-Apr. 1930, E. C. Kirk (with L. P. Anthony, Dec. 1917-Apr. 1930).--May 1930-Dec. 1936, L. P. Anthony., Vols. 1-13 are called "new series.", Merged in Jan. 1937 with: Journal of the American Dental Association, ISSN 1048-6364, to form: Journal of the American Dental Association and dental cosmos, ISSN 0375-8451., The Dental cosmos; a monthly record of dental science: Vol. XV. [Vol. 15] : Vol 15 : Issue 11, Page(s) 610, (dlps) volume: ACF8385.0015.001, (dlps) article: acf8385.0015.001:155, http://quod.lib.umich.edu/t/text/accesspolicy.html

7. Functional modulation and directed assembly of an enzyme through designed non-natural post-translation modification.

Author

Hartley AM, Zaki AJ, McGarrity AR, Robert-Ansart C, Moskalenko AV, Jones GF, Craciun MF, Russo S, Elliott M, Macdonald JE, and Jones DD

Abstract

Post-translational modification (PTM) modulates and supplements protein functionality. In nature this high precision event requires specific motifs and/or associated modification machinery. To overcome the inherent complexity that hinders PTM's wider use, we have utilized a non-native biocompatible Click chemistry approach to site-specifically modify TEM β-lactamase that adds new functionality. In silico modelling was used to design TEM β-lactamase variants with the non-natural amino acid p -azido-l-phenylalanine (azF) placed at functionally strategic positions permitting residue-specific modification with alkyne adducts by exploiting strain-promoted azide-alkyne cycloaddition. Three designs were implemented so that the modification would: (i) inhibit TEM activity (Y105azF); (ii) restore activity compromised by the initial mutation (P174azF); (iii) facilitate assembly on pristine graphene (W165azF). A dibenzylcyclooctyne (DBCO) with amine functionality was enough to modulate enzymatic activity. Modification of TEM W165azF with a DBCO-pyrene adduct had little effect on activity despite the modification site being close to a key catalytic residue but allowed directed assembly of the enzyme on graphene, potentially facilitating the construction of protein-gated carbon transistor systems.

Published
2015
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