液相色谱柱压升高原因

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

Millipak® Final Fill过滤器的特殊层叠式设计可最大程度地减少残留体积，从而增加产品回收。过滤器吹扫亦可有效降低折叠膜和层叠式过滤器使用后的残留量。

自然界中约有99%的微生物无法在实验室条件下培养纯化，对于环境或临床样本中的微生物群落研究，需要一种非培养依赖且同时覆盖多种微生物类型的检测技术，能对微生物群落进行种属水平的鉴定及定量分析，使得微生物鉴定更加全面、准确及高效。 华大智造基于自主研发的高通量测序平台和病原感染快速鉴定系统，开发出一套病原微生物检测整体解决方案，可实现在本地快速、准确、全面的对原始标本中的微生物进行分类鉴定，并自动出具分析结果，为感染性疾病的诊疗提供参考。同时，我们也提供多种病原微生物检测整体解决方案的组合，用户可根据需求灵活选择硬件及配套试剂耗材。