BiOI/H2O2协同光催化降解四环素性能研究

碘氧铋（BiOI）是一种新型光催化剂,以硝酸铋（ Bi (NO₃)₃）、碘化钾（KI）为原料,分别采用水热法以及溶剂热法制备两种形貌的BiOI材料,通过X射线粉末衍射仪（ XRD）、扫描电子显微镜（SEM）、红外光谱（ FTIR）、紫外可见漫反射（ UV-Vis DRS）和N₂吸脱附测试仪对其进行形貌、结构、性能表征。以四环素（TC）水溶液为例,测试制得的BiOI光催化降解性能,重点考察材料结构、光照条件、双氧水（H₂O₂）协同作用等对降解性能的影响。实验结果表明,溶剂热法制备的BiOI和H₂O₂协同作用时,在模拟太阳光下对四环素降解效果最好,4 h降解率可达99.11%。     

408例住院患者抗菌药物应用情况及合理性分析

为了解解放军总医院三个科室抗菌药物的使用情况及合理性,随机抽取普外科、肝胆外科、骨科三个临床科室2006年10月408例住院患者的药疗医嘱,统计抗菌药物的应用例数、联合用药及使用品种。三个科室抗菌药物应用各有特点,肝胆外科联合用药较多。抗菌药物应用基本合理,但应加强抗菌药物联合应用的管理,以防止少数药物的滥用现象。     

磁性碳纳米管对水中低浓度罗红霉素的吸附特性研究

碳纳米管是各方面性能优异的新型纳米材料,其吸附性能优于活性炭.采用化学共沉淀方法制备磁性MWCNTs.利用红外光谱和Zeta电位对磁性MWCNTs和MWCNTs进行表征分析.吸附实验探讨pH值、温度等因素对磁性MWCNTs吸附罗红霉素的影响,采用准一、二级动力学模型和Freundlich、Langmuir等温线方程拟合曲线,分析吸附质可能的吸附机理.结果表明:磁性MWCNTs对罗红霉素最佳吸附pH值为1,罗红霉素的最大吸附量为39.6 mg/g.用准一、二级动力学模型和Langmuir等温线方程能较好地拟合罗红霉素吸附过程,相关系数均在0.95以上.标准吸附焓变△Ho为9.284 kJ/mol,吸附自由能变△G在-60.812 ～-58.640 kJ/mol之间,△S＞0,吸附是自发的吸热过程.     

环境科学研究中的“明星”污染物及其近况

 环境污染已成为影响人类健康的最主要因素之一，作为新兴跨学科研究领域，环境健康相关的研究近年来得到了蓬勃发展。以2018年发表在国际顶级学术期刊或具有重要影响的研究成果为基础，通过梳理环境科学研究中备受关注的"明星"污染物相关的研究进展，盘点了典型环境污染物抗生素与超级细菌、塑料、药物、持久性有机污染物、农药以及人工纳米材料相关的重要研究成果。     

Chemiluminescence determination of tetracycline and oxytetracycline in pharmaceutical preparations using Ru (bipy)3 2+-cerium (IV) system

A new chemiluminescence (CL) method for the determination of tetracycline and oxytetracycline is developed, based on the CL reaction of tetracycline and oxytetracycline with Ru (bipy)₃ ²⁺ and Ce (IV). In sulfuric acid medium, the CL emission is generated upon continuous oxidtion of Ru(bipy)₃ ²⁺ by cerium (IV). The emission intensity is greatly enhanced when tetracycline and oxytetracycline are introduced into the reaction system after acid degradation. Under the optimum conditions, the calibration curves are linear over the range of 8.0×10⁻⁸∼4.0×10⁻⁶ mol/L for tetracycline and of 2.0×10⁻⁷∼4.0×10⁻⁵ mol/L for oxytetracycline, with the detection limits are 4.2×10⁻⁸ mol/L for tetracycline and 1.5×10⁻⁷ mol/L for oxytetracycline, respectively. The proposed method was used for the determination of tetracycline and oxytetracycline in pharmaceutical formulations with good results. Foundation item: Supported by the National Natural Science Foundation of China and the Natural Science Foundation of Hubei Province. Biography: HAH He-you (1962), male, Associate profeddor, Ph.D graduate candidate. Present address, Department of Chemistry, Huainan Teacher's College, Huainan.     

Cell wall polymers in Archaea (Archaebacteria)

The distribution of the various cell wall and cell envelope (S-layer) polymers among the main lineages of the domain Archaea (Archaebacteria) and the chemical composition and primary structure of polymers forming rigid cell wall sacculi is described. Differences between bacteria and archaea in their sensitivity to antibiotics which inhibit cell wall synthesis in bacteria are discussed.     

Chemiluminescence Determination of Tetracycline and Oxytetracycline in Pharmaceutical Preparations Using Ru(bipy)32+-Cerium(Ⅳ) System

A new chemiluminescence (CL) method for the determination of tetracycline and oxytetracycline is developed, based on the CL reaction of tetracycline and oxytetracycline with Ru(bipy)32+ and Ce (Ⅳ). In sulfuric acid medium, the CL emission is generated upon continuous oxidation of Ru(bipy)32+ by cerium (Ⅳ).The emission intensity is greatly enhanced when tetracycline and oxytetracycline are introduced into the reaction system after acid degradation. Under the optimum conditions, the calibration curves are linear over therange of 8. 0× 10-8～4. 0× 10-6 mol/L for tetracycline and of 2. 0× 10-7～4. 0× 10-5 mol/L for oxytetracycline, with the detection limits are 4. 2 × 10-8 mol/L for tetracycline and 1.5 × 10-7 mol/L for oxytetracydine, respectively. The proposed method was used for the determination of tetracycline and oxytetracycline in pharmaceutical formulations with good results.     

大理市下关镇动物源食品中四环素类抗生素残留的检测

目的：对大理市下关镇市售新鲜猪肉、鸡肉、牛肉、鱼肉及其肝脏中四环素类抗生素残留情况进行检测,以期为该镇动物源食品的监测及消费者食用安全提供理论依据。方法：用高效液相色谱,按照GB/T 5009.116—2003规定对采集的样品进行检测。结果：随机采取的样品均未检测出土霉素（OTC）、四环素（TC）、金霉素（CTC）。结论：大理市下关镇随机采集的本批动物性食品中没有四环素类抗生素残留。     

Fluorescence determination of tetracycline by Eu (III)/TOPO/TC system

The fluorescence intensity of the europium (III)-tetracycline (TC) complex can be greatly increased by TOPO, TBP, TTA and surfactans, among which TOPO showed the greatest enhancement. The formation of ternary complex was proposed to be responsible for the fluorescence enhancement. The Eu (III)-TOPO-TC system can be applied to the determination of trace amounts of tetracycline in urinous sample; the maximum fluorescence intensity was obtained in the pH range of 8.2∼9.5 with excitation and emission wave-lengths at 396 nm and 616 nm, respectively. The linear range for tetracycline is 6.0×10⁻⁹−5.0×10⁻⁷ mol·L⁻¹. The detection limit is 2.0×10⁻⁹ mol·L⁻¹(SNR=3). Experimental conditions and the mechanism of the enhancement effect are discussed. Supported by National Natural Science Foundation of China Huang Chunbao: born in 1958, Associate professor     

紫球藻对抗生素的生物学效应

研究了基因工程中常用抗生素标记对紫球藻的生物学效应,结果表明紫球藻对青霉素、链霉素、庆大霉素以及卡那霉素较不敏感,剂量在100u/mL以下对其生长无显著影响,但能抑制或杀灭伴生的杂菌,因此这些抗生素可用于藻种纯化过程中抑菌;紫球藻对红霉素、氧氟沙星和土霉素非常敏感,低质量浓度就能杀死藻细胞,可用作基因工程或遗传育种的抗药性选择标记;对四环素和氯霉素较为敏感,明显抑制细胞生长,并呈浓度梯度效应.