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Tetranuclear yttrium and gadolinium 2-acetylcyclopentanoate clusters：Synthesis and their use as spin-coating precursors for metal oxide film formation for field-effect transistor fabrication

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Journal of Rare Earths 2018年第10期36卷 1098-1105页

作者： Elaheh Pousaneh Andrea Preuβ Khaybar Assim Tobias Rüffer Marcus Korb Jana Tittmann-Otto sascha hermann Stefan E.Schulz Heinrich Lang Technische Universitat Chemnitz Faculty of Natural Sciences Institute of Chemistry Inorganic Chemistry D-09107 Chemnitz Germany Technische Universitiat Chemnitz Center for Mierotechnologies D-09107 Chemnitz Germany Fraunhofer Institute for Electronic Nano Systems ENAS Technologie-Campus 3 D-09126 Chemnitz Germany

Lanthanide clusters [Ln4（μ3-OH）2（η2-accp）4（（μ-O）-η2-accp）6]（Ln = Y（4）,Gd（5）; accp = 2-acetylcyclopentanoate） are accessible by treatment of [M（NO33·6 H2 O]（M = Y（1）,Gd（2）） with 3 equiv. of Haccp（3） in presence of NaOH. The molecular structures of 4 and 5） in the solid-state are discussed. The thermal behavior of 4 and 5 was studied by TG under Ar and O2, showing multistep decomposition processes. Additionally, DSC studies were carried out under an atmosphere of O2. PXRD measurements of the TG residues confirm the formation of Ln2 ***-coating experiments were carried out with 4 and 5 for Ln2 O3 film deposition on silicon substrates. The layers are smooth, close and are of thicknesses of 18.87±1.13 nm and 25.59 ± 4.55 nm for Ln = Y and Gd, which was evidenced by SEM and EDX studies. Field-effect transistors were successfully fabricated by deposition of carbon nanotubes on top of the Y2 O3 films and formation of palladium contacts by a lift-off procedure. An on/off ratio of more than 4 orders of magnitude is achieved without considerable leakage currents. These results demonstrate the potential use of spin-coated Y2 O3 as a gate dielectric in electronic devices.

关键词： β-Diketonates Yttrium Gadolinium Thermal analysis Spin coating CNT transistor

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Pharmacological Tie2 activation in kidney transplantation

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World Journal of Transplantation 2016年第3期6卷 573-582页

作者： Kristina Thamm Florence Njau Paul Van Slyke Daniel J Dumont Joon-Keun Park hermann Haller sascha David Department of Nephrology and Hypertension Medical School Hannover Vasomune Therapeutics Inc Biological Sciences Sunnybrook Research Institute

AIM To investigate the therapeutic potential of vasculotide(VT)- a Tie2 activating therapeutic- in kidney *** We performed a murine MHC-mismatched renal transplant model(C57Bl/6 male into Balb/c female) with 60 min cold and 30 min warm ischemia time. 500 ng VT was administered i.p. to donor mice 1 h before organ removal. In addition, recipients received 500 ng VT i.p. directly and 3 d after surgery. Survival was monitored and remaining animals were sacrificed 28 d after transplantation. In this model, we analyzed:(1) organ function;(2) Kaplan-Meier survival;(3) organ damage(periodic acid Schiff staining) via semi-quantitative scoring [0-4(0 = no injury/inflammation to 4 = very severe injury/inflammation)];(4) expression of renal endothelial adhesion molecules(ICAM-1) viaimmunofluorescence(IF) staining, immunoblotting and q PCR;(5) infiltration of inflammatory cells(IF Gr-1, F4/80); and(6) fibrosis via staining of α-smooth muscle actin(αSMA), Sirius red staining and immunoblotting of SMAD3 *** Exogenous activation of Tie2 with VT resulted in diminished expression of peritubular and glomerular endothelial adhesion molecules. Consequently, infiltration of inflammatory cells(analyzed as ICAM-1, Gr-1 and F4/80 positive cells) was reduced in VT-treated mice compared to controls. Additionally, VT was protective against fibrogenesis after kidney transplantation. Trends towards lower serum creatinine(vehicle: 142 ± 17 μmol/L vs VT: 94 ± 23 μmol/L), urea(vehicle: 76 ± 5 mmol/L vs VT: 60 ± 8 mmol/L) and lactate dehydrogenase(vehicle: 1288 ± 383 iU vs VT: 870 ± 275 iU) were observed on day 6 after transplantation. Kaplan-Meier survival analysis showed improved survival rates in the VT-treated mice that did not reach statistical significance(27% vs 54%, P = 0.24, n = 11 per group). Exogenous activation of Tie2 via VT might reduce infiltration of inflammatory cells into renal tissue thereby protecting the transplant from early graft dysfunction

关键词： Vasculotide Tie2 Kidney transplantation Endothelium Angiopoietin

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