نتایج جستجو برای: mn

تعداد نتایج: 39768  

2008
Xin-Xin Yao Shi-Shen Yan Shu-Jun Hu Xue-Ling Lin Chong Han Yan-Xue Chen Guo-Lei Liu Liang-Mo Mei

Hydrogen interstitials-mediated ferromagnetism in MnxGe1−x magnetic semiconductors was studied by first-principles calculations. It was found that the H:1s state in Mn–H–Mn complexes can strongly hybridize with the valence states of Mn and change the spin polarization of Mn atoms. Although the dopedMn atoms tend to form the nearest-neighborMn atomic pairs with antiferromagnetic coupling in Mn-d...

2012
Jong Hwa Park Ji Man Kim Mingshi Jin Jong-Ki Jeon Seung-Soo Kim Sung Hoon Park Sang Chai Kim Young-Kwon Park

The low-temperature catalytic ozone oxidation of benzene was investigated. In this study, Al-SBA-16 (Si/Al = 20) that has a three-dimensional cubic Im3m structure and a high specific surface area was used for catalytic ozone oxidation for the first time. Two different Mn precursors, i.e., Mn acetate and Mn nitrate, were used to synthesize Mn-impregnated Al-SBA-16 catalysts. The characteristics ...

2014
Domenick F. Leto Timothy A. Jackson

Mn K-edge X-ray absorption spectroscopy (XAS) was used to gain insights into the geometric and electronic structures of [Mn(II)(Cl)2(Me2EBC)], [Mn(IV)(OH)2(Me2EBC)](2+), and [Mn(IV)(O)(OH)(Me2EBC)](+), which are all supported by the tetradentate, macrocyclic Me2EBC ligand (Me2EBC = 4,11-dimethyl-1,4,8,11-tetraazabicyclo[6.6.2]hexadecane). Analysis of extended X-ray absorption fine structure (EX...

2006
F. Kronast R. Ovsyannikov A. Vollmer H. A. Dürr W. Eberhardt D. Schmitz L. W. Molenkamp

We applied x-ray absorption spectroscopy and x-ray magnetic circular dichroism XMCD at the Mn 2p-3d resonances to study the Mn 3d electronic configuration and the coupling of Mn 3d magnetic moments in various Ga1−xMnxAs films. The homogeneity of the Mn depth profile throughout the Ga1−xMnxAs film was tested by additional structure-sensitive x-ray resonant reflectivity measurements. In all inves...

2015
Jennie Lönnbro-Widgren Kerstin Ebefors Johan Mölne Jenny Nyström Börje Haraldsson

BACKGROUND In idiopathic membranous nephropathy (MN), antibodies directed towards the glomerular phospholipase A2 receptor (PLA2R) have mainly been reported to be of IgG4 subclass. However, the role of the different IgG subclasses in the pathogenesis of MN, both in idiopathic MN and in secondary cases, is still unclear. In this retrospective study, we test the hypothesis that the absence of glo...

2017
Kevin C. Chan Iris Y. Zhou Stanley S. Liu Yolandi van der Merwe Shu-Juan Fan Victor K. Hung Sookja K. Chung Wu-tian Wu Kwok-fai So Ed X. Wu

Although manganese (Mn) can enhance brain tissues for improving magnetic resonance imaging (MRI) assessments, the underlying neural mechanisms of Mn detection remain unclear. In this study, we used Mn-enhanced MRI to test the hypothesis that different Mn entry routes and spatiotemporal Mn distributions can reflect different mechanisms of neural circuitry and neurodegeneration in normal and inju...

زرین کوب, محمد حسین, برقی, بهناز, کلا گری, علی اصغر,

 Kamar Tallar mineralization zone in Gazik area is engulfed within ophiolitic melange in Sistan suture zone in east of Iran .The Mn- bearing ore bodies of Kamar Tallar are occurred as discontinuous patches intimately associated with cherts and meta – spilites. Field evidences and study of trenches show that the Mn- bearing patches are principally superficial and laterally limited. Braunite, Bix...

2014
Pan Chen Nancy Parmalee Michael Aschner

Manganese (Mn), is a trace metal required for normal physiological processes in humans. Mn levels are tightly regulated, as high levels of Mn result in accumulation in the brain and cause a neurological disease known as manganism. Manganism shares many similarities with Parkinson's disease (PD), both at the physiological level and the cellular level. Exposure to high Mn-containing environments ...

2000
D. Wortmann S. Heinze S. Blügel

c(232)MnCu/Cu(100) is an ordered two-dimensional surface alloy that exhibits a checkerboard arrangement of Mn and Cu atoms on the Cu~100! surface. Mn buckles outwards by 0.3 Å with respect to Cu and in all previous scanning tunneling microscopy ~STM! experiments only one chemical species was imaged which was assumed to be Mn. We analyze the STM results by first-principles calculations based on ...

2003
M. M. Grush J. Chen T. L. Stemmler S. J. George C. Y. Ralston R. T. Stibrany A. Gelasco G. Christou S. M. Gorun J. E. Penner-Hahn S. P. Cramer

The first Mn L-edge absorption spectra of a Mn metalloprotein are presented in this paper. Both reduced and superoxidized Mn catalase have been examined by fluorescence-detected soft X-ray absorption spectroscopy, and their Mn L-edge spectra are dramatically different. The spectrum of reduced Mn(II)Mn(II) catalase has been interpreted by ligand field atomic multiplet calculations and by compari...

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