Pure uterine lipoma

Lipomatous tumors of the uterus are unusual, benign neoplasms seen in postmenopausal women. Although many of the mixed-type cases such as lipoleiomyoma and fibrolipoma have been reported, pure uterine lipomas are extremely rare. In the literature, a few cases with pure uterine lipoma have been reported. We first present the advanced magnetic resonance findings of pure uterine lipoma, followed by those of ultrasonography (US) and computed tomography (CT). We markedly detected lipid peaks on the magnetic resonance spectroscopy (MRS) and the apparent diffusion coefficient value to be 0.00 due to chemical-shift effects with diffusion-weighted imaging (DWI). Although pelvic lipomatous tumors can be diagnosed with US and CT, in some cases, further workup may be required to localize the lesion. MRI may yield more valuable data for differential diagnosis. MRS and DWI findings provide additional clues on the nature of the lesion.     

N-芳基-N＇-（4-乙氧基苯甲酰基）硫脲衍生物阴离子识别性能的光谱研究

利用紫外-可见吸收光谱及^1H NMR考察了两种N-芳基-N＇-（4-乙氧基苯甲酰基）硫脲作为受体分子与F^-，Cl^-，Br^-，I^-，CH3COO^-，H2PO4^-，HSO4^-，NO3^-等阴离子的作用。结果表明，客体阴离子F^-，CH3COO^-，H2PO4^-可以与该类受体分子形成氢键配合物，溶液颜色由无色转变为黄色，而加入其他阴离子则无变化。测定了主客体配合物的稳定常数和化学配位比，对苯环上不同取代基的受体分子与不同阴离子客体的识别作用以及同一受体对不同阴离子的识别作用进行了比较，其识别性能呈现规律性变化，提出了可能的配合物的结合模式。     

Brillouin scattering of light by spin waves in ferromagnetic nanorods

We report the investigations of spin wave modes of arrays of Ni and Co nanorods using Brillouin light scattering. We have revealed the significant influence of spin wave modes along the nanorod axis in contrast to infinite magnetic nanowires. Unusual optical properties featuring an inverted Stokes/anti-Stokes asymmetry of the Brillouin scattering spectra have been observed. The spectrum of spin wave modes in the nanorod array has been calculated and compared with the experiment. Experimental observations are explained in terms of a combined numerical–analytical approach taking into account both the low aspect ratio of individual magnetic nanorods and dipolar magnetic coupling between the nanorods in the array. The optical studies of spin-wave modes in nanorod metamaterials with low aspect ratio nanorods have revealed new magnetic and magneto-optical properties compared to continuous magnetic films or infinite magnetic nanowires. Such magnetic artificial materials are important class of active metamaterials needed for prospective data storage and signal processing applications.     

Optimal control in NMR spectroscopy: Numerical implementation in SIMPSON

We present the implementation of optimal control into the open source simulation package SIMPSON for development and optimization of nuclear magnetic resonance experiments for a wide range of applications, including liquid- and solid-state NMR, magnetic resonance imaging, quantum computation, and combinations between NMR and other spectroscopies. Optimal control enables efficient optimization of NMR experiments in terms of amplitudes, phases, offsets etc. for hundreds-to-thousands of pulses to fully exploit the experimentally available high degree of freedom in pulse sequences to combat variations/limitations in experimental or spin system parameters or design experiments with specific properties typically not covered as easily by standard design procedures. This facilitates straightforward optimization of experiments under consideration of rf and static field inhomogeneities, limitations in available or desired rf field strengths (e.g., for reduction of sample heating), spread in resonance offsets or coupling parameters, variations in spin systems etc. to meet the actual experimental conditions as close as possible. The paper provides a brief account on the relevant theory and in particular the computational interface relevant for optimization of state-to-state transfer (on the density operator level) and the effective Hamiltonian on the level of propagators along with several representative examples within liquid- and solid-state NMR spectroscopy.     

红外光谱法与药用玫瑰真伪的分析与鉴定

文章采用红外光谱法(FTIR)并结合二维相关光谱分析技术分析鉴定了药用玫瑰(药材对照品)及其混淆品月季和蔷薇。在一维红外光谱中三者的谱图较为一致,但药用玫瑰在1 318 cm-1波数处的峰不明显 ,而月季和蔷薇的1 318 cm-1峰明显,且较尖。在高分辨的二阶导数谱中药用玫瑰和月季分别在1 617和1 618 cm-1处具有芳香类指纹特征峰,而蔷薇的峰则在1 612 cm-1波数处,相差了5～6 cm-1。在1 044 cm-1处的峰, 蔷薇糖类化合物的指纹特征峰较明显,月季和药用玫瑰不明显。观测二维相关红外谱,三者都存在1 620,1 560和1 460 cm-1的芳香类化合物的自动峰,不同的是月季和蔷薇还存在一个较明显的1 660 cm-1的肩膀峰。药用玫瑰、月季和蔷薇在850～1 250 cm-1范围内的二维相关红外光谱差别很大,药用玫瑰1 050 cm-1的糖类化合物自动峰强度最大,而月季的峰较弱,而蔷薇没有此峰。谱图的三级鉴定验证了药用玫瑰、月季和蔷薇在糖苷类化合物和芳香类化合物的相对含量上都是不一致的。结果表明,运用红外光谱法可以快速有效地分析和鉴定药用玫瑰及其混淆品。     

Surface and interface properties of thin pentacene and parylene layers

To improve Organic Thin Film Transistor (OTFT) properties we study OTFT semiconductor/dielectric interfacial properties via examination of the gate dielectric using thin Parylene C layer. Structural and morphology properties of pentacene layers deposited on parylene layer and SiO₂/Si substrate structure were compared. The surface morphology was investigated using atomic force microscopy (AFM) and scanning electron microscopy (SEM). AFM topography of pentacene layer in non-contact mode confirmed the preferable pentacene grain formation on parylene surface in dependence on layer thickness. The distribution of chemical species on the surfaces and composition depth profiles were measured by secondary ion mass spectroscopy (SIMS) and surface imaging. The depth profiles of the analyzed structures show a homogenous pentacene layer, characterized with C or C₂ ions. Relatively sharp interface between pentacene and parylene layers was estimated by characteristic increased intensity of CCl ions peak. For revealing the pentacene phases in the structures the Micro-Raman spectroscopy was utilized. Conformal coatings of parylene and pentacene layers without pinholes resulted from the deposition process as was confirmed by SIMS surface imaging. For the pentacene layers thicker than 20 nm, both thin and bulk pentacene phases were detected by Micro-Raman spectroscopy, while for the pentacene layer thickness of 5 and 10 nm the preferable thin phase was detected. The complete characterisation of pentacene layers deposited on SiO₂ and parylene surface revealed that the formation of large grains suggests 3D pentacene growth at parylene layer with small voids between grains and more than one monolayer step growth. The results will be utilized for optimization of the deposition process.      

Precise determination of Mg/Fe ratios applicable to terrestrial olivine samples using Raman spectroscopy

The relationship between Mg# [ = 100 Mg/(Mg + Fe) in mol] and the Raman shift was analyzed precisely for olivine [(Mg, Fe)₂SiO₄] samples with Mg# between 100 and 62.8. Two prominent peaks at 826–820 cm⁻¹ (peak 1) and 858–849 cm⁻¹ (peak 2) and three subordinate peaks at 883–881 cm⁻¹ (peak 3), 920–914 cm⁻¹ (peak 4), and 967–951 cm⁻¹ (peak 5) were observed to shift monotonously to lower wavenumbers with decreasing Mg#. The ΔMg#( = Mg#_ref − Mg#) versus Δν(= ν_ref − ν) can be linearly regressed for each peak as ΔMg# = A Δν, where ν is a peak wavenumber of olivine with Mg# ranging from 100 to 62.8, and ν_ref is that of olivine with a reference value of Mg#, namely, Mg#_ref. We set Mg#_ref as 100 (i.e.pure forsterite Mg₂SiO₄) whereas A is a regression parameter (5.789, 4.294, 12.34, 6.348, and 2.09, respectively,for peaks 1, 2, 3, 4, and 5). This equation enables us to avoid small inter‐laboratory differences of wavenumber calibration. The equation for peak 2 yields estimations of Mg# in geologically satisfactory precision, ± 1 Mg# (1σ) in the Mg# range of 100–62.8. Copyright © 2011 John Wiley & Sons, Ltd.     

Complex concentration dependence of SERS and UV–Vis absorption of glycine/Ag‐substrates because of glycine‐mediated Ag‐nanostructure modifications

Complex concentration‐dependence of surface‐enhanced Raman scattering (SERS) and UV–Vis absorption of Ag‐nanoparticles (AgNPs) mixed with Gly has been observed. Surprisingly, with decreasing Gly concentration, a new band in UV–Vis absorption of AgNPs/Gly mixtures is found to red‐shift with increasing intensity, until a turning point at a critical concentration. Further diluting Gly, the new band blue‐shifts with decreasing intensity. Similarly, the SERS intensities of Gly bands at 615 and 905 cm^–1 consistently increase with decreasing Gly concentrations, reaching maxima at the critical concentration. This agrees consistently with the variation in position and intensity of the new developing plasmon absorption band. Interestingly, transmission electron microscopy (TEM) revealed Gly‐induced modifications of AgNPs, including a reassembling and increasing aspect ratio with deceasing Gly concentration. The concentration‐dependent behavior of UV–Vis absorption, SERS, and TEM of AgNPs/Gly mixtures could be due to the complex nature of Gly‐AgNPs interaction depending on the molecular density, as supported by TEM images. Copyright © 2012 John Wiley & Sons, Ltd.     

不同采收期滇龙胆的红外光谱鉴别研究

采收是中药生产的重要环节,采收时间直接影响中药质量和产量,是中医临床安全有效用药的前提,开展中药适时采收期的研究具有重要意义和应用价值。采用傅里叶变换红外光谱法对72份不同采收期的滇龙胆进行鉴别研究,用TQ8.0软件对原始光谱进行一阶导数(first derivative,FD)、二阶导数(second derivative,SD)、标准正态变量(standard normal variate,SNV)、多元散射校正(multiplicative scatter correction,MSC)和平滑(savitaky-golay filter,SG)预处理,样品按3∶1分为校正集和预测集,同时建立主成分分析(principal component analysis,PCA)和偏最小二乘判别分析(partial least square discriminant analysis,PLS-DA)模型。结果显示,选取1 800~600cm~(-1)波段范围的光谱,去除光谱噪音;SNV结合二阶导数光谱和SG(15,3)平滑,预处理结果满意。主成分分析表明,前三个主成分方差贡献率为92.47%,5月、9月和10月份采收的样品差异较小。偏最小二乘判别分析建立判别模型,决定系数R2和校正均方根误差(RMSEE)分别为0.967 8和0.086 0,可对18个预测集样品进行准确分类。红外光谱法结合主成分分析、偏最小二乘判别分析对不同采收期滇龙胆的分类和判别效果较好,为不同采收期的中药鉴别提供理论依据。     

Electrocatalytic activity of ordered intermetallic PtSb for methanol electro-oxidation

Ordered intermetallic PtSb had been synthesized by arc-melted and then sintering treatment. The electro-oxidation of liquid methanol on PtSb was investigated at room temperature by cyclic voltammetry and chronoamperometry. The results are compared to those at a polycrystalline platinum electrode surface. It was found that PtSb intermetallic was catalytically more active than pure platinum according to the onset potential and current density. X-ray diffraction (XRD) and XPS technologies had been used to investigate the crystal structure and electron effect.