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SUMMARY:Nanoscale amorphous precursors and their phase transitions in dive
 rse biominerals
DTSTART:20190318T131500
DTEND:20190318T141500
DTSTAMP:20260510T020836Z
UID:617fc7205da60bd837f520b625dc8e02dfb3e11a2f2d96c361a412d2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Pupa Gilbert\, Physics Department\, University of Wiscon
 sin-Madison USA\nCrystallization by particle attachment (CPA)1 of amorphou
 s precursors has been demonstrated in\nbiominerals formed by several anima
 ls. Precisely the same precursors phases\, hydrated (ACCH2O)\nand anhydrou
 s calcium carbonate (ACC)\, have been observed spectromicroscopically in 3
 \ndiverse phyla: echinoderms2\, molluscs3\, and cnidarians4 (Figure 1). Th
 is is surprising because\nthese groups diverged from one another long befo
 re they evolved their characteristic body plans\nand capacity for skeletal
  biomineralization. How far back in time does this biomineralization\nstra
 tegy go\, and why? Can we harness it for 3D printing or other useful mater
 ials synthesis?\n1 JJ De Yoreo\, PUPA Gilbert\, NAJM Sommerdijk\, RL Penn\
 , S Whitelam\, D Joester\, H Zhang\, JD Rimer\, A\nNavrotsky\, JF Banfield
 \, AF Wallace\, FM Michel\, FC Meldrum\, H Cölfen\, PM Dove. Crystallizat
 ion by\nparticle attachment in synthetic\, biogenic\, and geologic environ
 ments. Science 349\, aaa6760 (2015).\n2 YUT Gong\, CE Killian\, IC Olson\,
  NP Appathurai\, AL Amasino\, MC Martin\, LJ Holt\, FH Wilt\, PUPA Gilbert
 .\nPhase transitions in biogenic amorphous calcium carbonate. Proc Natl Ac
 ad Sci 109\, 6088-6093\n(2012).\n3 RT DeVol\, C-Y Sun\, MA Marcus\, SN Cop
 persmith\, SCB Myneni\, PUPA Gilbert. Nanoscale Transforming\nMineral Phas
 es in Fresh Nacre. J Am Chem Soc 137\, 13325-13333 (2015).\n4 T Mass\, AJ 
 Giuffre\, C-Y Sun\, CA Stifler\, MJ Frazier\, M Neder\, N Tamura\, CV Stan
 \, MA Marcus\, PUPA\nGilbert. Amorphous calcium carbonate particles form c
 oral skeletons. Procs Natl Acad Sci 114\, E7670-\nE7678 (2017).\nBio: Pupa
  Gilbert got her doctoral degree in Physics in 1987 in Rome\, Italy. She w
 as a staff scientist at the Italian CNR and the EPFL before going to the U
 S as a professor of physics at UW-Madison in 1999. She is a physicist with
  a burning passion for biology and materials science\, and she studies bio
 minerals\, their structure\, and formation mechanisms with the synchrotron
  spectromicroscopy methods she developed.\n 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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