Ar (3P0,2)与SO2反应产生SO (A″3Σ+)的光谱

在流动余辉装置上,研究了亚稳态Ar(3P0,2)与SO2的传能反应.在位于流动管不同位置的两个窗口处,观察到了320~600nm的不同的两组光谱序列.其中,下游窗口所测光谱与之前作者在Ar与SO2混合气体空心阴极放电实验中得到的光谱一致,确定为SO(c1Σ-→X3Σ-)的发射谱;根据基于最小二乘法编写的光谱模拟程序模拟的光谱结果,上游窗口所测光谱中位于SO(c1Σ-→X3Σ-)发射谱线长波方向上的光谱序列被归属为SO(A″3Σ+→X3Σ-),并得到SO(A″3Σ+)的光谱常数为:T00=(30460±18.0)cm-1,ωe′χe′=(7.7±0.8)cm-1,ωe′=(685±8.0)cm-1.     

Multifunctional Antibody Agonists Targeting Glucagon‐like Peptide‐1, Glucagon,and Glucose‐Dependent Insulinotropic Polypeptide Receptors

Glucagon‐like peptide‐1 (GLP‐1) receptor (GLP‐1R), glucagon (GCG) receptor (GCGR), and glucose‐dependent insulinotropic polypeptide (GIP, also known as gastric inhibitory polypeptide) receptor (GIPR), are three metabolically related peptide hormone receptors. A novel approach to the generation of multifunctional antibody agonists that activate these receptors has been developed. Native or engineered peptide agonists for GLP‐1R, GCGR, and GIPR were fused to the N‐terminus of the heavy chain or light chain of an antibody, either alone or in pairwise combinations. The fusion proteins have similar in vitro biological activities on the cognate receptors as the corresponding peptides, but circa 100‐fold longer plasma half‐lives. The GLP‐1R mono agonist and GLP‐1R/GCGR dual agonist antibodies both exhibit potent effects on glucose control and body weight reduction in mice, with the dual agonist antibody showing enhanced activity in the latter.     

Adsorption of Zn(II) on graphene oxide prepared from low‐purity of amorphous graphite

The adsorption of Zn(II) in aqueous solutions on graphene oxide (GO) prepared from low‐purity of natural amorphous graphite has been studied in this work. The study was performed through the measurements of Zeta potential, atomic force microscope, Fourier transform infrared spectrum and X‐ray photoelectron spectroscopy. The results indicated that the adsorption followed the Langmuir model with the maximum Zn(II) adsorption capacity of 73 mg/g at pH 7.0. In addition, the adsorption was well described by the pseudo‐second‐order kinetics model. The mechanism of the Zn(II) adsorption on GO was mainly attributed to chemical adsorption through complexation reaction between Zn(II) and hydroxyl or carboxyl groups on the GO sheets, while the electrostatic interaction also contribute to the whole interaction. Copyright © 2016 John Wiley & Sons, Ltd.     

Preparation and characterization of benzoyl‐hydrazide‐derivatized poly(lactic acid) and γ‐cyclodextrin inclusion complex and its effect on the performance of poly(lactic acid)

A nucleating agent, benzyl‐hydrazide‐derivatized poly(lactic acid) (PLA) and γ‐cyclodextrin inclusion complex (PLA‐IC‐BH), was synthesized through a series of reactions. Poly(lactic acid) and γ‐cyclodextrin inclusion complex (PLA‐IC) was first obtained by ultrasonic co‐precipitation, which was then subjected to carboxylation, acylation, and amidation using benzoyl hydrazine and thionyl chloride. The composition and structure of PLA‐IC‐BH was confirmed by ¹H nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, and X‐ray diffraction. PLA/PLA‐IC‐BH composites were prepared by melt blending and a hot‐press forming process. Mechanical properties, thermal stabilities, and crystallization behaviors of PLA/PLA‐IC‐BH samples were investigated by thermogravimetric analysis, differential scanning calorimetry (DSC), polarized optical microscopy (POM), rheological analysis, and so on. Mechanical testing and thermogravimetric analysis showed that the tensile strengths, impact properties, and thermal stabilities of PLA/PLA‐IC‐BH composites were improved significantly compared to pure PLA and PLA/PLA‐IC. DSC results showed that crystallinity of PLA was increased from 5.17% to 38.93% after introduction of PLA‐IC‐BH. POM results showed that PLA‐IC‐BH acted as a nucleating agent for PLA and enhanced its crystallization rate. Rotational rheological behaviors of PLA/PLA‐IC‐BH demonstrated that incorporation of PLA‐IC‐BH increased the rigidity of the network structure of the PLA matrix. Compared to those of PLA, the maximum torque and apparent viscosity of PLA/PLA‐IC‐BH composites were increased by 55.56% and 25.59%, respectively. Copyright © 2017 John Wiley & Sons, Ltd.     

基于三棱柱体的三维地质体可视化研究

三维可视化技术能形象表达地层信息的真实形态及构造要素的空间关系而应用广泛,建立了一种以三棱柱体作为基本体元来实现三维地质体可视化的方法,该方法通过对三角形的自分解并且充分考虑地质体内所存在的断层等地质现象,在引入虚拟钻孔的基础上,建立三维模型,该模型通过自分解而实现地质体内部信息的显示,最后用实际资料进行了验证。     

长链非编码RNA UCA1 在胃癌组织中的表达及其效应分析

目的 分析胃癌组织特征长链非编码RNA（lncRNA）表达谱,并探讨长链非编码RNA UCA1 在胃癌中的表达及效 应。方法 采用基因芯片检测6 例胃癌患者的肿瘤组织及癌旁正常组织LncRNA表达水平,分析胃癌组织特征lncRNA 表达谱,进一步通过定量PCR 检测40 例胃癌及其对应的癌旁正常组织中UCA1的表达并分析淋巴结转移、肿块大小、细胞分化程度及病理分期等临床病理特征的关系。在此基础上,利用siRNA 下调AGS 胃癌细胞内UCA1 表达水平,利用CCK-8 试剂盒检测UCA1干预对胃癌细胞增殖能力的影响。结果 LncRNA 基因芯片检测到胃癌组织1 021条差异＞2倍的lncRNA（P＜0.05）,定量PCR 验证明显差异表达的UCA1在胃癌组织中的表达显著高于正常组织（P＜0.01）。此外,临床病理相关分析显示,UCA1表达水平还与胃癌的细胞分化程度及病理分期相关。分化低的胃癌组织中UCA1表达水平明显高于中、高分化的胃癌组织（P＜0.05）;病理分期Ⅲ/Ⅳ期胃癌组织的UCA1 表达水平明显高于Ⅰ/Ⅱ期的标本（P＜0.05）。此外,下调UCA1 胃癌细胞表达可明显抑制细胞增殖。结论 异常表达的lncRNA 参与了胃癌的发生、发展,其中肿瘤组织上调表达的UCA1是胃癌重要的促癌基因。     

基于等温吸附的页岩水分传输特征研究

研究页岩的水分传输特征至关重要,不仅有助于认识页岩的物理化学性质,而且也有助于评价页岩气的吸附扩散和流动能力.本文设计了页岩的水分传输实验装置,采用美国伍德福德和中国南方龙马溪组页岩为研究对象,开展了不同温度、不同湿度下页岩的水分传输实验,研究了页岩的水分传输特征和影响因素.结果表明,页岩的水分吸附属于II型曲线,包含着单分子层吸附、多分子层吸附和毛细凝聚的过程,GAB模型可用于描述页岩的水分吸附过程;水分吸附随着相对压力的增大而增强,有机碳含量和温度对页岩水分吸附起着增强作用,而方解石会抑制页岩的水分吸附;随着相对压力的增大,页岩的水分扩散系数呈现先增大后减小随后增加的趋势,其系数大约在8.73$\times$10$^{ - 9}\sim $5.95$\times $10$^{ - 8 }$m$^{2}$/s之间;伍德福德页岩的等量吸附热均大于龙马溪页岩的等量吸附热,这与其页岩的成熟度有关.研究结果为认识页岩的物理化学性质和力学性能以及评价页岩气的吸附流动能力提供参考依据.      

In-situ monitoring of nitrile-bearing pesticide residues by background-free surface-enhanced Raman spectroscopy

In-situ monitoring of pesticide residues during crop growth or/and in related products is of great significance in avoiding the abuse of pesticides but remains challenging thus far. In this report, we proposed a background-free surface-enhanced Raman spectroscopy（bf-SERS） platform to non-destructively track the nitrile-bearing pesticide residues in soybean leaves with high sensitivity and selectivity. The outstanding feature of the assay stems from the dramatic Raman enhancement effect of the 50...     

Co-Assembly of Gd(III)-Based Metallosurfactant and Conjugated Polymer Nanoparticles in Organosilica Cross-Linked Block Copolymer Micelles for Highly Efficient MRI and Fluorescent Bimodal Imaging

Conformity of two biological imaging entities, magnetic resonance imaging (MRI) and fluorescence imaging, is achieved through co-assembly of a Gd(III)-based metallosurfactant, conjugated polymeric nanoparticles, and amphiphilic block copolymer F127 (PEO₁₀₆PPO₇₀PEO₁₀₆) followed by crosslinking with organosilica. The cross-linked micelles with a size around 100 nm exhibit outstanding dispersion stability in aqueous and phosphate buffered saline solutions, bright fluorescence emission, and high relaxivities, providing a new approach to synthesize highly efficient bimodal contrast agents. The relaxivities of the co-assembled micelles are synergistically enhanced by incorporation of Gd(III) complexes with high hydration number (q = 3) and elongation of rotation correlation time to achieve r₁ values up to 105.37 mm ⁻¹ s⁻¹ (at 1.5 T), which is over 20 times that of clinically used MRI contrast agents and among the highest values of all the nanoparticular MRI contrast agents. The external PEO layer endows these micelles with very low cytotoxicity for both in vitro and in vivo imaging. Meanwhile, thanks to the enhanced permeability and retention effect originating from their nanoscale sizes, the bimodal contrast agents show a prolonged blood circulation time in vivo and targeted accumulation at tumor regions to display outstanding MRI imaging performance.