紫外可见分光光度法检测硒酵母片中硒的含量

文献名： Structural, morphological and optical properties of Bi NPs obtained by laser ablation and their selective detection of L-cysteine 作者： Ramon Gabriel Teixeira Rosaa, Celso de Araujo Duartea , Wido Herwig Schreinera, Ney Pereira Mattoso Filhoa, Arandi Ginane Bezerra Jr.b, Andersson Barisonc, Fernanda Maria Marins Ocamposc a Departamento de Física, Universidade Federal do Paraná Centro Politécnico, CP 19044, 81531-990 Curitiba (PR), Brazil b Departamento Acadêmico de Física, Universidade Tecnológica Federal do Paraná, 80230-901 Curitiba (PR), Brazil c Departamento de Química, Universidade Federal do Paraná Centro Politécnico, CP 19081, 81531-990 Curitiba (PR), Brazil 摘要：In the present work we show the results of the investigation of the properties of bismuth nanoparticles (NPs) obtained by the laser ablation in water. The samples were characterized by various techniques: UV/vis spectroscopy, dynamic light scattering, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, nuclear magnetic resonance and zeta potential. The NPs were metallic and surface oxidated, exhibiting absorption peak at 257 nm due to the surface plasmon resonance. The interaction between the NPs and various amino acids was studied and revealed a selective sensibility to cysteine on a range of concentration from 80 to 720 μM, which we attribute to a dimerization of cysteine to cystine probably complexed to the nanoparticle surface by electrostatic interactions, leading to the modification of the NP absorption spectrum. 关键词：Bismuth; Nanoparticles; Laser ablation; Cysteine

医疗污水包含了多种细菌、重金属、有机溶剂及酸碱溶液等生化有毒有害物质。如上述物质直接排放，将会对自然生态及人类生活环境造成危害。我国对医疗污水有清晰的排放标准。连华科技对于《医疗机构水污染物排放标准GB18466-2005》中所涉及的参数，多款便携及实验室仪器及耗材可满足检测需求

肿瘤特异性抗体功能分析包含很多方面： T细胞功能活化及增殖、细胞因子分析、抗体依赖的细胞介导的细胞毒性作用（antibody-dependent cell-mediated cytotoxicity; ADCC）、抗体介导的补体依赖的细胞毒性（complement dependent cytotoxicity; CDC）、巨噬细胞抗体依赖性的细胞吞噬作用（Antibody-Dependent Cellular Phagocytosis; ADCP）等。

沸石、金属有机骨架（MOF）、共价有机骨架（COF）和有机-无机杂化钙钛矿材料，最近因其复杂的结构和赋予新功能的通用性而受到广泛关注。然而，这些精细结构在电子束（e-beam）辐射下容易损坏，这给它们的表征带来了很大的困难。 针对此类样品，上海科技大学（通讯单位）与日本电子株式会社联合报告了一种方法，使用常规ADF/ABF就可以在极低电子剂量下对电子束敏感晶体进行成像。该文以Improving Data Quality in Traditional Low-dose Scanning Transmission Electron Microscopy Imaging为题发表在学术期刊?Particle & Particle Systems Characterization上。日本电子应用工程师王灵灵与上海科技大学蒋亦岚老师为共同第一作者，周毅老师与张青老师为共同通讯作者。