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Upconversion Luminescence of Er3＋ Ions in Transparent Germanate Glass Ceramics Containing CaF2 Nanocrystals

Chinese Physics Letters 2010年第6期27卷 229-232页

作者： WU Dong TANG Bin laurent calvez ZHANG Xiang-Hua ZHANG Long Key Laboratory of High-Power Laser Materials Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 Graduate School of Chinese Academy of Sciences Beijing 100049 Laboratory of Glasses and Ceramics University of Rennes Rennes 35042 France

The visible upconversion and near-infrared luminescence of Er3＋ ions in germanate glass ceramics containing GaF2 nanocrystals are investigated. The nanocrystals are characterized by x-ray diffraction （XRD） and transmission electron microscopy, showing their mean sizes less than 20hm. High transmittance of the glass ceramics is displayed by absorption spectra. The upconversion luminescence intensity in the glass ceramics increases significantly with increasing temperature. Both the shifts of the XRD peaks and the Stark-split shown in the luminescence spectra indicate the entrance of the Er3＋ ions into the CaF2 nanocrystals, which is confirmed by a Judd-Ofelt analysis. Possible mechanisms of the upconversion luminescence are analyzed.

关键词： Luminescence Ions Glass Ceramics Microscopy

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Influence of Ag Doping on Physico-Chemical Properties of the Ge28Sb12Se60 Chalcogenide Glassy Matrix

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材料科学与工程（中英文A版） 2016年第3期6卷 131-147页

作者： Deepak Patil Manisha Konale Lukas Strizik laurent calvez David Le Coq Bozena Frumarova MilanVlcek Tomas Wagner Department of General and Inorganic Chemistry and CEMNAT Faculty of Chemical Technology University of PardubiceStudentska 95 Pardubice 53210 Czech Republic Current Affiliation-School of Mechanical and Materials Engineering Washington State University Pullman WA- 99164 USA Institut des Sciences Chimiques de Rennes Eq. Verres et COramiques UMR 6226 CNRS University de Rennesl 35042 RennesCedex France Institute of Macromolecular Chemistry of Czech Academy of Sciences v.v.i. Heyrovskeho nam. 2 162 06 Prague Czech Republic

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High-elevation hypoxia impacts perinatal physiology and performance in a potential montane colonizer

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Integrative Zoology 2020年第6期15卷 544-557页

作者： Jérémie SOUCHET Eric J.GANGLOFF Gaëlle MICHELI Coralie BOSSU Audrey TROCHET Romain BERTRAND Jean CLOBERT Olivier calvez Albert MARTINEZ-SILVESTRE Elodie DARNET Hugo LE CHEVALIER Olivier GUILLAUME Marc MOSSOLL-TORRES laurent BARTHE Gilles POTTIER HervéPHILIPPE Fabien AUBRET Station d’Ecologie Théorique et Expérimentale du Centre National de la Recherche Scientifique MoulisFrance Department of Zoology Ohio Wesleyan UniversityDelawareOhioUSA Catalonia Reptile and Amphibian Rescue Center(CRARC) MasquefaBarcelonaSpain Bomosa Pl.Parc de la MolaLes EscaldesAndorra Pirenalia EncampAndorra Nature En Occitanie ToulouseFrance Département de Biochimie Centre Robert-CedergrenUniversitéde MontréalMontréalCanada

Climate change is generating range shifts in many organisms,notably along the elevational gradient in mountainous ***,moving up in elevation exposes organisms to lower oxygen availability,which may reduce the successful reproduction and development of oviparous *** test this possibility in an upwardcolonizing species,we artificially incubated developing embryos of the viperine snake(Natrix maura)using a split-clutch design,in conditions of extreme high elevation(hypoxia at 2877 m above sea level;72%sea-level equivalent O2 availability)or low elevation(control group;*** at 436 m above sea level).Hatching success did not differ between the two *** developing at extreme high elevation had higher heart rates and hatched earlier,resulting in hatchlings that were smaller in body size and slower swimmers compared to their siblings incubated at lower ***,post-hatching reciprocal transplant of juveniles showed that snakes which developed at extreme high elevation,when transferred back to low elevation,did not recover full performance compared to their siblings from the low elevation incubation *** results suggest that incubation at extreme high elevation,including the effects of hypoxia,will not prevent oviparous ectotherms from producing viable young,but may pose significant physiological challenges on developing offspring in *** early-life performance limitations imposed by extreme high elevation could have negative consequences on adult phenotypes,including on fitness-related traits.

关键词： developmental plasticity embryonic metabolism high-elevation hypoxia locomotor performance Natrix maura

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