高校本科化学和应用化学专业人才培养中专业课程的设置研究

大学教育中专业课程设置是实现专业人才培养目标的核心。通过调研国内外部分高校本科化学和应用化学专业的专业基础课程、专业核心课程和专业延伸课程的设置情况,提出了本科化学类专业人才培养中合理设置3个层次课程的依据和建议,明确了专业课程结构,为制定本科化学类专业的人才培养方案提供了参考,对指导和促进化学类专业人才的培养具有重要意义。     

化学教学论课程结构与教学实践研究

对于高师本科开设的化学教学论课程 ,本文给出理论课、教学技能实践课、化学教学研究、化学实验研究的课程结构 ,所依据的课程资源以及教学实践过程 ,从而形成了较完整的教学方法体系     

一流化学专业建设的探索与实践

四川大学化学学院坚持立德树人根本,倾力办最好的化学本科教育,十年磨一剑,从课程思政、教学体系、课堂教学改革、科教融合、教材建设、国际化教育等多方面、全方位协同开展一流本科教育川大实践,求真务实培养具有突出的化学智慧、化学感悟、化学视野和鲜明川大烙印的化学专业精英和领军人才。     

基础理论纵贯化学学科:吉林大学“统计力学与分子模拟”课程建设*

化学的基础理论的演进不断重塑着化学学科。传统的教学体系所依据的理论范式落后于现代化学理论的发展。吉林大学化学学院面向本科学生开设了“统计力学与分子模拟”课程。针对吉林大学本科学生的特点,精心安排了教学内容,通盘考虑知识体系的衔接,优化了教学方法。同时,淬炼了课程中的思政元素,从而在思想、道德、知识等3个方面进一步提升学生的综合素质。     

高等工科院校普通化学课程设置现状及存在问题

1989年11月25日,上海市化学化工学会化学教育专业委员会和上海市高校普通化学课程协作组联合召开座谈会,就上海地区高等工科院校本科各专业普通化学课程设置的问题进行座谈.出席会议的有上海交通大学、华东化工学院等19所高校和中专从事普通化学教学的教师24人.与会同志怀着十分沉重的心情,对当前工校本科各专业、特别是非化学类专业普通化学课程设置中出现的问题发表了直率而又中肯的意见.     

知识体系构建的本科教学实践

结合厦门大学本科分析化学基础课程的教学实践,对如何在本科基础课程教学中融入知识处理和学科知识体系一体化构建进行了初浅的探讨。提出了一种基于识别诱导信号激励与信号传感的化学测量一体化知识体系,并结合多元化创新思维教学案例对其教学意义进行了探讨。     

国内外高等院校农林类本科化学教学体系的比较

本文介绍了国外部分发达国家高等农林院校本科化学教学体系，着重对无机化学、有机化学和分析化学３门基础课在课程设置、教学内容、教学手段和实验教学方面的情况与我国的现状进行比较。并探讨了当前我国高等农业院校本科化学教学体系改革中存在的问题。     

“三三制”人才培养模式下化学实验教学改革的探索与实践

南京大学国家级化学实验教学示范中心基于"三三制"本科人才培养理念,对化学实验教学进行了改革,完善了"专业学术类"人才培养的实验课程,加强了"交叉复合类"实验课程建设,探索了"就业创业类"人才培养的实验课程及平台建设,取得了显著的建设成效。     

消费化学课程选修学生背景及课程开设效果调查报告

消费化学课程是在本科各学科课程教学的基础上,为了拓展学生的知识面和了解当代化学的发展与人们生活的密切关系而针对全校本科生开设的跨系选修课。为了更好地达到课程开设的目的,针对一学年来选修消费化学课程的学生进行了问卷调查,并针对调查结果进行了统计分析,最后对调查结果进行了总结及讨论。     

综合性大学通识课程“化学与健康”的教学探索

通识课程是高校专业教学内容的重要组成部分,对于提高本科人才培养质量具有深远的作用。通识课“化学与健康”的教学内容涉及化学、生命、药学、医学、环境等学科。该课程可以拓宽学生知识面、促进多学科交叉,达到提高科学素养的目的。以通识课“化学与健康”教学实践为基础,针对综合性大学该课程的建设基础、课程目标及教学内容设计、教学方法与手段、教学效果、思政元素的引入等方面进行了讨论,调研了国外相关课程设置的特点,为加强高校、尤其是综合性大学通识课程的建设提供参考。     

延边地区65～108岁健康老人头发中锌、铜、铁、锰、镁的含量

用原子吸收光谱法测定延边地区317名65～108岁老人头发中锌、铜、铁、锰、镁含量，观察不同民族、性别、年龄老人这些元素的差异。结果表明：1.朝鲜旗发锌低于汉族，满族发铜低于汉族、朝鲜族，汉族发镁高于朝鲜族、满族，发铁、发锰在汉、朝、满民族之间无区别。2．汉族、朝鲜族男发锌高于女性，汉族女性发铜高于男性，发铁、发锰、发镁在性别之间无区别。3、90岁组朝鲜族发锰、发镁低于65岁、76岁组，朝鲜族发锌、发铜、发铁在65～108岁之间无统计学意义。     

Analytical strategies to determine antibiotic residues in fish

The accelerated growth of aquaculture has resulted in a series of harmful effects to human health. The widespread and unrestricted use of antibiotics in this industry, to prevent bacterial infections, leads to remaining amounts in the aquatic environment. This has resulted in the emergence of antibiotic-resistant bacteria in aquaculture environments, in the increase in antibiotic resistance in fish pathogens as well as in the transfer of these resistance determinants to human pathogens. Moreover, the use of large amounts of antibiotics may lead to the presence of residual antibiotics in fish tissue and fish products. Fluoroquinolones, tetracyclines, penicillins, sulphonamides and other antibiotics, exhibiting activity against both Gram-positive and Gram-negative bacteria, are widely used for the treatment and prevention of diseases in fish. An extended and comprehensive review on the recent analytical methodologies concerning antibiotic residues in fish reported in the literature is provided in the present article. Emphasis is given on sample preparation regarding isolation and purification, chromatographic conditions and method validation according to legislation. Results of published assays are comparatively presented and criticised.     

Effect of the displacement reaction on the composition of the magnetic layer in electrodeposited layered nanostructures Co-Cu/Cu and Ni-Cu/Cu

Methods of stripping voltammetry, quartz microgravimetry, and x-ray-fluorescence analysis are employed to explore the copper displacement process on thin electrodeposited layers of pure cobalt and nickel and on deposits of these metals with inclusions of copper. The displacement reaction proceeds at a considerable rate on cobalt in the sulfate and sulfosalicylate solutions and virtually does not proceed on nickel in both the sulfate or sulfate-chloride solutions. An estimate of the rate of the copper displacement reaction following a change in the concentration of copper ions in the solution and in the pH of the sulfosalicylate solution is given. A decrease in the contact exchange rate is facilitated by a decrease in the concentration of copper ions in solution and their participation in the formation of complexes.     

壳聚糖及其在分析化学中的应用

综述了壳聚糖、甲壳素在污水处理、电化学、原子吸收光谱、高效液相色谱、吸光光度法中的应用。引用文献28篇。     

Changes in density and surface tension of water in silica pores

 The density and surface tension of water in small pores of silicas have been investigated. These physical properties of water in the pores were calculated from a comparison of pore volumes and pore radii which were estimated from adsorption and desorption isotherms of nitrogen and water. Below a pore radius of about 5 nm both the density and the surface tension of water in the pores were smaller than those of the bulk liquid and decreased with a decrease in pore size. The density of water in the pores decreased with an increase in the concentration of surface hydroxyl groups. Similarly the surface tension of water in the pores is influenced by the surface hydroxyl groups. Anomalous changes in the density and surface tension of the water in the pores are attributed to the interaction of water molecules with surface hydroxyl groups and hydrogen-bond formation among water molecules. Received: 20 April 1999 Accepted in revised form: 17 November 1999     

青藏高原湖泊影响锂元素迁移和富集的矿物、元素及环境因素——以西藏郭扎错钻孔沉积物为例

作为我国战略性矿产的锂矿,主要赋存于青藏高原盐湖中。湖泊系统中,锂的富集和迁移规律关系到锂矿的高效提取和未来锂矿的储量估算。本文以西藏咸水湖郭扎错的钻孔沉积物为例,结合AMS14C年代和Mg元素含量变化,系统分析了孔隙水、碳酸盐矿物和硅酸盐矿物的锂含量变化,探讨了矿物、镁元素、环境变化和早期成岩作用等对锂元素迁移和富集的影响。郭扎错沉积物中锂和镁大部分存在于硅酸盐矿物中,锂和镁较高的相关性说明二者存在于相同的硅酸盐矿物中,如粘土矿物。大约90%的锂赋存在硅酸盐矿物中,约8.5%的锂赋存在碳酸盐矿物中,孔隙水中的锂含量占比仅约1.5%。碳酸盐矿物中Mg/Li摩尔比值为78–270,是孔隙水中10多倍,而硅酸盐矿物中的Mg/Li摩尔比值稳定在24–29之间。水–沉积物相互作用促进硅酸盐矿物中锂的释放,咸水环境下释放的锂多于淡水环境下。碳酸盐矿物中,锂和镁主要存在于方解石中。镁离子对锂离子的迁移具有阻碍作用,低温、高盐度下的阻碍作用更强。湖泊沉积物可能是湖水锂的一个重要来源。     

Evaluation of the Fate of Aldicarb and Its Metabolites in Oranges

Abstract

The accumulation, persistence and fate of systemic pesticide aldicarb was melencholy evaluated in orange crops. The concentration of this pesticide and its two toxic metabolites, aldicarb sulfoxide and aldicarb sulfone was determined in leaves, rind and pulp of three orange varieties (Satsuma, Navelina and Clemetina de Nules) and in the top soil of the orange groves. The groves were located in two different places in the Valencia Community (Spain). The analysis showed that the aldicarb concentration was lower than those of aldicarb sulfoxide and aldicarb sulfone. In all cases, the residues persisted at least 160 days in vegetable samples and between 157 and 227 days in soil samples. Residue concentrations measured in the soil samples were highly variable but a relation with the organic matter content can be observed. The residue levels found in vegetal products were higher in leaves than in rind, and in rind than in pulp. The maximum residue values were obtained between 47 and 70 days after the application. One hundred days after treatment (Security period) the residue levels of total fruit were lower than the maximum residue level of 0.2 mg/kg established by law.     

The conductance of bile salt-lecithin-water mixtures

The conductance of aqueous solutions of sodium glycodeoxycholate and sodium taurodeoxycholate displays a complex concentration dependence (0–0.5 C) with a maximum and minimum occurring in dilute solutions. This behavior can be related to physiologic concentrations observed in hepatic and gallbladder bile and interpreted in terms of anion dimerization and ultimately micellization. The addition of lecithin in 1:2 or 1:5 molar ratios results in micellization at lower concentration, disappearance of the maximum and minimum in the conductance curve, and a decrease in the total conductance.     

Effects of dilute acid and steam explosion pretreatments on the cellulose structure and kinetics of cellulosic fraction hydrolysis by dilute acids in lignocellulosic materials

Worldwide, yellows diseases impact plants important in human nutrition, the natural environment, and the culture and commerce of humans. Since the presumed pathogens, mycoplasma-like organisms (MLOs), have not been isolated in pure culture in vitro, their study must proceed by other experimental approaches. In a study of disease affecting grapevines in Europe and North America, polymerase chain reactions (PCR) and restriction analyses of PCR-amplified DNA were used to detect and differentiate strains of MLOs associated with grapevine yellows. MLOs were detected both in naturally diseased grapevines and in experimentally inoculated host plants. The data indicated an unexpected genomic diversity among grapevine-infecting MLOs, and supported their classification with MLOs in the aster yellows, X-disease, and elm yellows groups. The presence of diverse MLOs in grapevines provokes consideration that these MLOs may be present in overlapping geographic ranges and that multiple MLO infections may occur in individual plants, increasing the complexity of grapevine yellows epidemiology and control and the significance of sensitive MLO detection in planting stock and phytosanitary-regulated germplasm.     

煤中Se、Cd在焦化过程中迁移规律的研究

利用现代分析测定仪器和实验室模拟手段,以煤及固相(焦炭)、液相焦化产物(焦油、氨水)、气相焦化产物(煤气)中有害微量元素镉(Cd)、硒(Se)为研究对象。通过测定,比较不同煤化度煤种微量元素的含量,并归纳探讨了配合煤中Cd、Se元素在焦化过程中的迁移规律。发现煤化度不同的煤中,镉元素随着煤变质程度升高而减少;硒元素含量对比:QFFM,JM和SM中含量相差不大。在模拟焦化温度1 000℃环境下,分别有45%的硒和48%的镉元素转移到焦炭中,2%的硒和7%的镉转移到氨水中,12%的硒和15%的镉转移到焦油中,并通过物料衡算,发现有41%的硒和30%的镉释放到煤气中。