“废电池”怎样为教学服务

我们在1953—1954这一学年度曾初步试将废电池炼锌,解决实验上的需要。至今已获得了点滴经验,据初步估计,大约给国家节省了三十元左右的开支。如以全省或全国各中等学校都这样做的     

铜电极表面的电致发光法现场测试

采用电致发光等方法, 初步探讨了铜电极在0.25 mol·L~(-1)Na_2S_2O_8+1.25 mol·L~(-1)NaOH溶液中的电致发光特性及其相关性能, 给出了电致发光法现场测试铜电极表面性质的初步结果。     

金/巯基环肽单层膜的循环伏安和交流阻抗初步研究

用电化学方法初步研究了巯基环肽的在金基底上形成的吸附层,结果表明硫基环肽（CPCBC）可以在金表面形成成具有一定覆盖度的吸附膜;与烷基硫醇单层膜不同的是,该吸附膜十分松散。我们初步认为巯基环肽分子采用“直立式吸附”并且巯基环肽分子结构的复杂性是造成吸附膜松散的原因。     

化学教科书多媒体软件——《化学元素周期系》

介绍了《化学元素周期系》教科书软件的内容和特点,及在教学中初步试用的效果。     

三苯基环戊二烯扩环反应研究

研究在高氯酸银作用下,三苯基环戊二烯扩环氧化生成三苯基取代吡喃盐的反应,并初步探讨了反应机理     

不同溶剂中酶催化合成油酸酯研究初探

对几种非水溶剂中脂肪酶催化合成油酸酯 (油酸乙酯、油酸正辛酯和油酸油酯 )进行了初步考察。结果表明 ,在环己烷、正庚烷和甲苯等有机溶剂中 ,上述酯化反应都有很高的转化率 ;在所考察的实验条件下 ,超临界CO2 中反应的转化率略比上述有机溶剂中的低 ,但该结果已初步显示以超临界CO2 替代有机溶剂合成油酸酯具有很大的应用潜力。     

合成高分子量无规聚丙烯—在烷烃溶剂中聚合及性能初步表征

丙烯聚合;茂金属催化剂;立体结构;合成高分子量无规聚丙烯—在烷烃溶剂中聚合及性能初步表征     

高效区带电泳的研究

本文对高效区带电泳进行了初步的系统研究。采用内径为0.5毫米的聚四氟乙烯毛细管,提高了样品容量,便于使用紫外检测器,在23厘米和 61厘米管长中获得了数万理论板。讨论了载体电解质体系、电泳条件及样品组分荷电性质对分离效果的影响,初步探讨了电泳过程中若干因素与分离效率的关系,得到一些有用的结果。     

Vitamin K脉冲辐解与激光光解的研究(Ⅰ)──VK_3水溶液脉冲辐解还原反应时间分辨的研究

研究了VK3水溶液经脉冲辐解后VK3阴离子自由基的形成机理及其次级反应，观察到VK3阴离子自由基的最大吸收波长位于约340nm处，这与VK3阴离子自由基最大吸收波长在390nm附近的观点有所不同，并初步分析了这种差异的原因．初步探讨了VK3对Thymine-和Adenine-的修复作用，显示VK3本身是很好的辐射保护剂．     

放射性碘标记海洛因的初步研究

本文用氯胺－5氧化法对海洛因进行碘－125标记。初步研究了反应PH,同时、温度和海洛因的量对标记率的影响。采用SephadexG-10柱将碘标海洛因与游离碘－125分离,并对试验中出现的现象和可能的反应机理作了初步探讨,产物在SephadexG-10柱上分离纯化后,研究了^125I-heroin的稳定性,结果指出,标记产物在室温放置116h后放化纯度仍达70％。     

化“材”为“筑”

Chemistry is a central, practical and creative discipline. The development of chemistry plays an important role in the progress of science and society, as well as the improvement of the quality of human life. This paper introduces the chemical knowledge of stone, concrete, glass and other inorganic nonmetallic building materials by the anthropomorphically story. Taking nanomaterials as an example, the prospect of building materials development in the future is put forward.     

"Alpha"-, "beta"- and "delta"-anhydrodigitoxigenin

The syntheses of 3β-hydroxy-5β-carda-14, 20:22-dienolide (= «β»-anhydro-), 3β-hydroxy-5β-carda-8:14, 20:22-dienolide (= «α»-anhydro-) and «δ»-anhydro-digitoxigenin (= probably 3β-hydroxy-5β, 14β-carda-8, 20:22-dienolide) by the best ways known to date, have been described. «δ»-Anhydro-digitoxigenin represents the thermodynamically most stable isomer. In this isomer the double bond in position 8 is unaffected by hydrogenation with Pt in acetic acid; with perbenzoic acid an epoxide results from which, on hydrogenation, the double bond can be regenerated in its original position. Analogous reactions are known to occur in the 8:14-epoxides.     

Making "wheels" and "cubes" from triangles

[Mn(IV)Mn(II)3] triangular units directed by the presence of tripodal alcohols self-assemble in the presence of azide and acetate ligands to form either a [Mn24] "wheel" or a [Mn32] "cube".     

"Turn-on" fluorescent sensing with "reactive" probes

Chemical probes are valuable tools for the investigation of biochemical processes, diagnosis of disease markers, detection of hazardous compounds, and other purposes. Therefore, the development of chemical probes continues to grow through various approaches with different disciplines and design strategies. Fluorescent probes have received much attention because they are sensitive and easy-to-operate, in general. To realize desired selectivity toward a given analyte, the recognition site of a fluorescent probe is designed in such a way to maximize the binding interactions, usually through weak molecular forces such as hydrogen bonding, toward the analyte over other competing ones. In addition to such a supramolecular approach, the development of fluorescent probes that sense analytes through chemical reactions has witnessed its usefulness for achieving high selectivity, in many cases, superior to that obtainable by the supramolecular approach. Creative incorporations of the reactive groups to latent fluorophores have provided novel chemical probes for various analytes. In this feature article, we overview the recent progress in the development of turn-on fluorescent probes that are operating through chemical reactions triggered by target analytes. Various chemical reactions have been implemented in the development of many reactive probes with very high selectivity and sensitivity toward target analytes. A major emphasis has been focused on the type of chemical reactions utilized, with the hope that further explorations can be made with new chemical reactions to develop reactive probes useful for various applications.     

"Clickable" polymersomes

Polymersomes, composed of amphiphilic polystyrene-block-poly(acrylic acid) (PS-b-PAA), with the periphery being covered with azide groups, were used for further functionalization using "click" chemistry.