Manganese mercury thio­cyanate (MMTC) glycol mono­methyl ether

In the title complex, [MnHg(NCS)₄(C₃H₈O₂)]_n, each Hg atom is tetrahedrally coordinated with four S atoms of the SCN^? ions, and each Mn atom is octahedrally coordinated with four N atoms of the SCN^? ions, one hydroxyl O atom and one ethereal O atom of the glycol mono­methyl ether mol­ecule. Each pair of Hg and Mn atoms is bridged by one SCN^? ion. A 24‐membered Mn₃Hg₃(SCN)₆ ring is formed as the strucrural unit, with the six metal atoms in a chair‐form hexagonal arrangement. The units are condensed and linked three‐dimensionally in the crystal resulting in a diamond‐like structure.     

乙酸对DNA空间结构微观损伤的Raman光谱特征

利用Raman光谱技术从分子水平研究了乙酸对鲱鱼精DNA空间结构微观损伤的特征。实验结果表明,鲱鱼精DNA被乙酸浸润处理后,Raman特征频率与强度均发生了不同程度的变化。证明了乙酸对DNA的损伤是整个分子,包括骨架磷酸基团、脱氧核糖及碱基。不仅是DNA的构象,而且其构型也发生了变化：氢键断裂,B型构象被修改,DNA单、双链断裂,碱基也受到了严重损伤。其碱基损伤严重程度依次为胞嘧啶、胸腺嘧啶、鸟嘌呤和腺膘呤。     

采用光纤技术实现拉曼光谱和扫描隧道显微镜实时联用测试

设计并制作了与扫描隧道显微镜（ＳＴＭ）探头和拉曼光谱仪相适配的光纤探测装置，该装置采用配有不很短焦距的自聚焦透镜以获得较大的相对孔径，并使用多束光纤以充分利用扫描隧道显微镜探针周围有限空间，提高了拉曼散射光的收集效率，获得具有较高信噪比的拉曼谱图，在该装置的基础上进一步建立拉曼－扫描隧道显微镜联用系统，初步实验表明该联用系统用于实时研究固／气和固／液界面体系是可行的，即利用扫描隧道显微镜可获得固体     

脉冲氧碘化学激光器的动力学模拟研究

根据氧碘化学激光器的反应机理建立了一维预混脉冲出光理论模型,从理论上研究了碘原子密度、单重态氧密度及产率、其他组分密度和光学参量(输出耦合率、增益长度等)对单脉冲能量及脉宽的影响.分析了影响单脉冲能量和激光脉宽的内部动力学过程.讨论了出光过程中增益开关效应.计算的结果为优化脉冲氧碘化学激光器提供了理论依据.     

影响石英单模光纤数值孔径测量的因素及分析

本文采用远场光斑法和光强法测量了石英单模光纤的数值孔径.实验结果表明,由光纤耦合条件不同导致的光斑形状变化,对数值孔径的测量影响不大,单模光纤的纤芯直径小,导致出射光存在较强的衍射现象,对数值孔径的测量造成较大的影响,无论采用光斑法还是光强法,需以衍射第1次极大为计算标准,尽量选择光斑中心为亮斑时测量其数值孔径.此外,...     

A Facilely Synthesized Dual-State Emission Platform for Picric Acid Detection and Latent Fingerprint Visualization

To achieve a highly efficient, dual-state emission platform for picric acid (PA) detection and latent fingerprint (LFP) visualization, flexible alkyl chains have been facilely attached to the commercial organic dye 3,4,9,10-perylenetetracarboxylic dianhydride to provide the target perylenetetracarboxylate molecules PTCA-C4, PTCA-C6, and PTCA-C12. Interestingly, all these molecules exhibited impressive fluorescence characteristics with high photoluminescence quantum yields (PLQYs) of around 93.0 % in dilute solution. Also, emissive features were observed in the solid state because close molecular packing is prevented by the alkyl chains, especially for PTCA-C6, which has a high PLQY value of 49.0 %. Benefiting from its impressive fluorescence performance in both solution and as aggregates, PTCA-C6 was used as a dual-state emission platform for PA detection and also LFP visualization. For example, double-responsive fluorescence quenching in solution was observed in PA detection studies, resulting in high quenching constants (K_SV) and also low limit-of-detection values. Furthermore, the fingerprint powder based on PTCA-C6 also presented an impressive performance on various substrates in terms of fluorescence intensity and resolution, clearly providing the specific fine details of latent fingerprints. These results demonstrate that the facilely synthesized PTCA-C6 with efficient dual-state emission exhibits great potential in the real-world applications of PA detection and LFP visualization.     

RECOGNITION AND CLASSIFICATION FOR O（n）-EQUIVARIANT BIFURCATIONS WITH O（n）-CODIMENSION LESS THAN 5

1.IntroductionInthispaperweinvestigatelocalbifurcationsequivariantunderthestandardactionoftheorthogonalgroupO(n)onR".Oneofthemotiwtionstostudysuchproblemsisthatmanyphysicalsystemspossessthesphericalsymmetry,forexample,inthestudyofbucklingofaplanardiskofasphericalshell.Anothermotivationcomesfromsomemathematicalrequirement,forexample,thestudyofdegenerateHopfbifurcations(see[2,61).MostoftheseproblemscanbereducedtothestudyofthelocalbifurcationdiagramsofO(n)equivarialltbifUIcationproblems.Afunda…     

电泳毛细管的改性及其在酶和单克隆抗体分离分析中的应用

用壁处理办法对高性能毛细管电泳的毛细管柱进行改性,在Bio-Rad HPE-100中用肽测得组分的平均柱效为200000/m,使用寿命在200次以上。对纤维素酶.尿酶等一系列的样品作了分离和测定,尿酶5次重复测定的相对标准偏差小于1％。在10min内分离并测定了由细胞瘤培养的实际样品中的抗乙肝抗体(HBsAG),反映迁移时间重复性的相对标准偏差为1.87％,并作出了相应校正曲线。     

蕨藻红素（Caulerpin）的结构分析

蕨藻红素分子的化学计量式为Ｃ_（２４）Ｈ_（１８）Ｎ_２Ｏ_４，用Ｘ－ｒａｙ法确定其晶体结构。该结晶呈紫红色，属单斜晶系，空间群为Ｃｃ。晶胞参数：ａ＝１９．６１２（４），ｂ＝４．７６３（１），ｃ＝２０．４３４（５）Ａ，β＝８１．８３（２）°，Ｚ＝４，Ｖ＝１８８９．４（７）Ａ~３，Ｄ_ｃ＝１．４１５ｇ·ｃｍ~（－３），Ｆ（０００）＝８３２。应用直接法解析分子结构。以最小二乘法修正结构参数。最终可靠因子Ｒ＝０．０５４，Ｒ_ω＝０．０６３。结果表明蕨藻红素分子是具有非晶体学Ｃ_２对称性的吲哚生物碱。     

Synthesis, Structure and Non-linear Optical Properties of Iron Mercury Tetrathiocyanate

IntroductionTheMHg(SCN)4seriesofcrystallinecomplexeshavebeenknowninanalyticalchemistryfortheircharacteristicshapesand..l.,,i.Withthedevelopmentofnon-linearoptics(NLO),thiskindofcoordinationcompoundshavebeendiscoveredtobeusefulasNLOmaterials.In1970s,ItwasreportedthattheN'LOcoefficient(fordoublinginfraredI.064urnNd:YAGlaserbeamtogenerate0.532urngreenlight)ofCdHg(SCN)4wasI.3timesasthatofNLOcrystalLiIO,'.Furthermore,wehaverecentlydiscoveredthattheCdHg(SCN)'crystalcangeneratesecondha…