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Houssiau L, Noël C, Mine N, Jung KW, Min WJ, Moon DW. Investigation of Cs surface layer formation in Cs-SIMS with TOF-MEIS and SIMS. SURF INTERFACE ANAL 2014. [DOI: 10.1002/sia.5614] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- L. Houssiau
- Research Centre in Physics of Matter and Radiation; University of Namur; 61 rue de Bruxelles B 5000 Namur Belgium
| | - C. Noël
- Research Centre in Physics of Matter and Radiation; University of Namur; 61 rue de Bruxelles B 5000 Namur Belgium
| | - N. Mine
- Research Centre in Physics of Matter and Radiation; University of Namur; 61 rue de Bruxelles B 5000 Namur Belgium
| | - K. W. Jung
- Department of New Biology; DGIST; Sang-Ri 50-1 Dalseong Daegu 711-873 Korea
| | - W. J. Min
- K-MAC; Yongsan-Dong 554 Yuseong-Gu Daejeon 305-500 Korea
| | - D. W. Moon
- Department of New Biology; DGIST; Sang-Ri 50-1 Dalseong Daegu 711-873 Korea
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Eun LY, Song H, Choi E, Lee TG, Moon DW, Hwang D, Byun KH, Sul JH, Hwang KC. Implanted bone marrow-derived mesenchymal stem cells fail to metabolically stabilize or recover electromechanical function in infarcted hearts. Tissue Cell 2011; 43:238-45. [PMID: 21700305 DOI: 10.1016/j.tice.2011.04.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Revised: 04/26/2011] [Accepted: 04/27/2011] [Indexed: 11/27/2022]
Abstract
Mesenchymal stem cells (MSCs) have been used with success in several clinical applications for clinical treatment of ischemic hearts. However, the reported effects of MSC-based therapy on myocardial infarction (MI) are inconsistent. In particular, the preventive effects of MSC-based therapy on arrhythmic sudden death and metabolic disorders after infarction remain controversial. Here, we investigated the effects of MSCs on reverse remodeling in an infarcted myocardium, and found that MSC-therapy failed to achieve the complete regeneration of infarcted myocardium. Histological analyses showed that although infarct size and interstitial fibrosis induced by MI recovered significantly after MSC treatment, these improvements were marginal, indicating that a significant amount of damaged tissue was still present. Furthermore, transplanted MSCs had slight anti-apoptotic and anti-inflammatory effects in MSC-implanted regions and no significant improvements in cardiac function were observed, suggesting that naïve MSCs might not be the right cell type to treat myocardial infarction. Furthermore, small ion profiling using ToF-SIMS revealed that the metabolic stabilization provided by the MSCs implantation was not significant compared to the sham group. Together, these results indicate that pretreatment of MSCs is needed to enhance the benefits of MSCs, particularly when MSCs are used to treat arrhythmogenicity and metabolically stabilize infarcted myocardium.
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Affiliation(s)
- L Y Eun
- Yonsei University Graduate School of Medicine, Seoul 120-752, Republic of Korea
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Abstract
ABSTRACTThe oxidation of Si(111) and Si(100) surfaces with the high-purity
ozone(more than 98 mole %) was investigated with X-ray photoelectron
spectroscopy (XPS). Thin oxide less than 3nm thickens was formed in an
experimental chamber and the results showed that ozone oxidizes the (111)
surface faster than (100) surface. Ozone does not show the temperature
dependence on oxidation within the temperature range of 250–500 degree C for
both (111) and (100) surfaces. Ozone proceeds the oxide formation at 700
degree C where oxygen does not proceed oxide formation rapidly.
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Cho YJ, Lee WJ, Kim CY, Cho MH, Kim H, Lee HJ, Moon DW, Kang HJ. Band gap change and interfacial reaction in Hf-silicate film grown on Ge(001). J Chem Phys 2008; 129:164117. [DOI: 10.1063/1.3000392] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kim KJ, Moon DW, Park CJ, Simons D, Gillen G, Jin H, Kang HJ. Quantitative surface analysis of FeNi alloy films by XPS, AES and SIMS. SURF INTERFACE ANAL 2007. [DOI: 10.1002/sia.2575] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Kim KJ, Moon DW, Chi P, Simons D. Development of B-doped Si multiple delta-layer reference materials for SIMS profiling. SURF INTERFACE ANAL 2005. [DOI: 10.1002/sia.2080] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Moon DW. Summary of ISO/TC 201 standard: XV. ISO 20341:2003—Surface chemical analysis—secondary ion mass spectrometry—method for estimating depth resolution parameters with multiple delta-layer reference materials. SURF INTERFACE ANAL 2005. [DOI: 10.1002/sia.2057] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Seah MP, Spencer SJ, Bensebaa F, Vickridge I, Danzebrink H, Krumrey M, Gross T, Oesterle W, Wendler E, Rheinländer B, Azuma Y, Kojima I, Suzuki N, Suzuki M, Tanuma S, Moon DW, Lee HJ, Cho HM, Chen HY, Wee ATS, Osipowicz T, Pan JS, Jordaan WA, Hauert R, Klotz U, van der Marel C, Verheijen M, Tamminga Y, Jeynes C, Bailey P, Biswas S, Falke U, Nguyen NV, Chandler-Horowitz D, Ehrstein JR, Muller D, Dura JA. Critical review of the current status of thickness measurements for ultrathin SiO2 on Si Part V: Results of a CCQM pilot study. SURF INTERFACE ANAL 2004. [DOI: 10.1002/sia.1909] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Foo YL, Bratland KA, Cho B, Lim CW, Baker J, Wen JG, Moon DW, Greene JE. Self-organized superlattice formation during crystal growth from continuous beam fluxes. Phys Rev Lett 2003; 90:235502. [PMID: 12857270 DOI: 10.1103/physrevlett.90.235502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2003] [Indexed: 05/24/2023]
Abstract
Alloy superlattice structures consisting of alternating Si-rich and C-rich layers form spontaneously during gas-source molecular beam epitaxy of Si(1-y)C(y) on Si(001) from constant Si2H6 and CH3SiH3 precursor fluxes at T(s)=725-750 degrees C. The self-organized patterning is due to a complex interaction among competing surface reactions. During growth of the initial Si-rich layer, strain-driven C segregation to the subsurface results in charge transfer from surface Si atom dangling bonds to C backbonds. This decreases the Si2H6 sticking probability, and, hence, the instantaneous deposition rate, thereby enhancing C segregation. The Si-rich layer continues until a critical C coverage is reached allowing nucleation of a C-rich layer which grows until the excess subsurface C is depleted. The process then repeats with periods tunable through the choice of T(s) and y(avg).
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Affiliation(s)
- Y L Foo
- Frederick Seitz Materials Research Laboratory and the Materials Science Department, University of Illinois, 104 South Goodwin Avenue, Urbana, IL 61801, USA
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Kim JW, Yeom HW, Kong KJ, Yu BD, Ahn DY, Chung YD, Whang CN, Yi H, Ha YH, Moon DW. Spontaneous N incorporation onto a Si(100) surface. Phys Rev Lett 2003; 90:106101. [PMID: 12689011 DOI: 10.1103/physrevlett.90.106101] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2002] [Indexed: 05/24/2023]
Abstract
Initial nitridation of the Si(100) surface is investigated using photoemission, ion-scattering and ab initio calculations. After dissociation of NO or NH3, nitrogen atoms are found to spontaneously form a stable, highly coordinated N[triple bond]Si(3) species even at room temperature. The majority of the N species is incorporated into the subsurface Si layers occupying an interstitial site, whose atomic structure and unique bonding mechanism is clarified through ab initio calculations. This unusual adsorption behavior elucidates the atomistic mechanism of initial silicon nitride formation on the surface and has important implication on the N-rich layer formation at the SiO(x)N(y)/Si interface.
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Affiliation(s)
- J W Kim
- Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea
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Lee G, Hong S, Kim H, Shin D, Koo JY, Lee HI, Moon DW. Structure of the Ba-induced Si(111)- (3 x 2) reconstruction. Phys Rev Lett 2001; 87:056104. [PMID: 11497792 DOI: 10.1103/physrevlett.87.056104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2001] [Indexed: 05/23/2023]
Abstract
The Ba/Si(111) surface, previously known as a 3 x 1 phase, is found to have a 3 x 2 periodicity and a semiconducting band gap. The substrate reconstructs into the honeycomb chain-channel (HCC) structure with Ba atoms in the channel, as in the alkali-metal-induced Si(111)-(3 x 1). However, the metal coverage is determined to be 1/6 monolayers, half the alkali-metal coverage. We propose that the structure and the metal coverage determined for the Ba adsorbate is universal for other alkaline-earth-metal adsorbates. With the alkali-metal-induced 3 x 1 case, our results lead to a rule that one donated electron per 3 x 1 surface unit is necessary to stabilize the HCC reconstruction of Si.
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Affiliation(s)
- G Lee
- Materials Evaluation Center, Korea Research Institute of Standards and Science, Taejon 305-600, Korea.
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Moon DW, Kim KJ, Park Y, Kim HK, Ha YH, Oh DH, Kang HJ. Medium-energy ion scattering spectroscopy for quantitative surface and near-surface analysis of ultrathin films. SURF INTERFACE ANAL 2000. [DOI: 10.1002/1096-9918(200008)30:1<484::aid-sia828>3.0.co;2-u] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Park YJ, Youn HS, Banerjee S, Lee DR, Baik HM, Lee KB, Kim KJ, Moon DW. (Ta/Si) multilayer as a wide-bandpass monochromator material. J Synchrotron Radiat 1998; 5:705-707. [PMID: 15263626 DOI: 10.1107/s0909049597020311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/1997] [Accepted: 12/24/1997] [Indexed: 05/24/2023]
Abstract
Specular and non-specular X-ray reflectivity intensities of a (Ta/Si)(60) multilayer sample were measured to characterize its interface structure. Since the multilayer has a good reflectance at its multilayer peaks, its performance as a wide-bandpass monochromator for X-ray scattering experiments of polymers has been tested.
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Affiliation(s)
- Y J Park
- Beamline Research Division, Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Korea
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Kim KJ, Moon DW, Nam SH, Lee WJ, Kim HG. XPS sputter depth profiling of the chemical states for SrTiO3/Si interface by O2+ ion beams. SURF INTERFACE ANAL 1995. [DOI: 10.1002/sia.740231302] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Yoshihara K, Moon DW, Fujita D, Kim KJ, Kajiwara K. GaAs/AlAs superlattice as a proposed new reference material for sputter depth profiling. SURF INTERFACE ANAL 1993. [DOI: 10.1002/sia.740201306] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Moon DW, Beljan JR. Tensile strength testing methodology for partially healed rat skin wounds: engineering considerations. J Assoc Adv Med Instrum 1971; 5:191-7. [PMID: 4949599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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