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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kroger, Roland
University of York
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2016Semiconductor-Metal Nano-Floret Hybrid Structures by Self-Processing Synthesiscitations
- 2013Microstructural evolution and nanoscale crystallography in scleractinian coral spherulitescitations
- 2013Formation and Structure of Calcium Carbonate Thin Films and Nanofibers Precipitated in the Presence of Poly(Allylamine Hydrochloride) and Magnesium Ionscitations
- 2011An artificial biomineral formed by incorporation of copolymer micelles in calcite crystalscitations
- 2008Interaction of Stacking Faults in Wurtzite a-Plane GaN on r-Plane Sapphire
- 2008The role of anisotropy for defect properties in a-plane GaN
- 2008The role of anisotropy for the defect properties in a-plane GaN - art. no. 689403
- 2007On the mechanism of dislocation and stacking fault formation in a-plane GaN films grown by hydride vapor phase epitaxy
- 2007Defect structure of a-plane GaN grown by hydride and metal-organic vapor phase epitaxy on r-plane sapphirecitations
- 2006The versatility of hot-filament activated chemical vapor depositioncitations
- 2006Anti-diffusion barriers for gold-based metallizations to p-GaN
- 2006TEM analyses of wurtzite InGaN islands grown by MOVPE and MBEcitations
- 2006Anisotropic spatial correlation of CdSe/Zn(S)Se quantum dot stacks grown by MBEcitations
- 2006Surface segregation of Si and Mg dopants in MOVPE grown GaN films revealed by X-ray photoemission spectro-microscopycitations
- 2005Surfactant-mediated epitaxy of Ge on Si(111)citations
- 2005Microstructure of highly p-type doped GaN sub-contact layers for low-resistivity contacts
- 2004Determination of the anisotropic optical properties for perfluorinated vanadyl phthalocyanine thin filmscitations
- 2004Microstructural study of quantum well degradation in ZnSe-based laser diodes
- 2002On the way to the II-VI quantum dot VCSELcitations
- 2002Plasma induced microstructural, compositional, and resistivity changes in ultrathin chemical vapor deposited titanium nitride filmscitations
Places of action
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article
Microstructural evolution and nanoscale crystallography in scleractinian coral spherulites
Abstract
One of the most important aspects in the research on reef-building corals is the process by which corals accrete biogenic calcium carbonate. This process leads to the formation of a mineral/organic composite and it is believed that the development of the nano- and microstructure of the mineral phase is highly sensitive to the growth conditions. Transmission electron microscopy (TEM) analysis of large-scale (10 × 30 μm) focused ion beam (FIB) prepared lamellae was performed on adult and juvenile scleractinian coral skeleton specimens. This allowed for the investigation of the nano and microstructure and the crystallographic orientation of the aragonite mineral. We found the following microstructural evolution in the adult Porites lobata specimens: randomly oriented nanocrystals with high porosity, partly aligned nanocrystals with high porosity and areas of dense acicular crystals of several micrometers extension, the latter two areas are aligned close to the [0 0 1] direction (Pmcn space group). To the best of our knowledge, for the first time the observed microstructure could be directly correlated with the dark/bright bands characteristic of the diurnal growth cycle. We hypothesize that this mineral structure sequence and alignment in the adult specimen is linked to the photosynthetic diurnal cycle of the zooxanthellea regulating the oxygen levels and organic molecule transport to the calcifying medium. These observations reveal a strong control of crystal morphology by the organism and the correlation of the accretion process. No indication for a self-assembly of nanocrystalline units, i.e., a mesocrystal structure, on the micrometer scale could be found.