2-噻吩甲酸（5-氟尿嘧啶-1-基）甲酯的合成、晶体结构和热性质

报道了一种新的5-氟尿嘧啶衍生物2-噻吩甲酸（5-氟尿嘧啶-1-基）甲酯的合成.用1HNMR、13CNMR、IR对其进行了结构表征,通过单晶X射线衍射确定了晶体结构,同时分析了热性质.晶体属单斜晶系,空间群为P2/c,晶胞参数为：a=9.6134（14）,b=4.8381（7）,c=24.534（4）,α=90°,β=97.289（3）°,γ=90°;Z=4,F（000）=552,R1=0.0616.     

Biochemical parameters in neuroblastoma

Apart from the biochemical parameters routinely used like Vanillyl Mandellic Acid for the patients with neuroblastoma the parameters like neuron specific enolase, ferritin, lactate dehydrogenase, gamma glutamyl transferase were also studied to assess the utility in diagnosing the patients with neuroblastoma. The study involved 40 healthy ambulatory subjects and 30 untreated cases of histologically proved neuroblastoma referred to the Tata Memorial Hospital for further management and treatment. The urinary Vanillyl Mandellic Acid levels and the serum levels of neuron specific enolase, ferritin, lactate dehydrogenase had increased significantly, p<0.001 whereas the gamma glutamyl transferase had decreased significantly p<0.001, as compared to the normal. Serum neuron specific enolase, ferritin, lactate dehydrogenase alongwith urinary Vanillyl Mandellic Acid could be of help in diagnosing the patients with neuroblastoma.     

金银花中绿原酸提取工艺的正交试验研究

采用正交试验法研究乙醇浓度、用量、提取时间和提取次数4个因素对金银花提取液中绿原酸含量的影响。该方法不需要绿原酸标准物。结果表明,乙醇的浓度对绿原酸的含量有显著影响。     

The Mismatch between Students’ Mental Models of Acids/Bases and their Sources and their Teacher’s Anticipations thereof

The aim of this study is to compare the characteristics and sources of students’ mental models of acids and bases with a teacher’s anticipations and, based on this comparison, to explore some possible explanations why motivated students might fail to learn from a subject‐knowledgeable chemistry teacher. The study involves a chemistry teacher and her 38 ninth graders and focuses on the mental models of three high achievers and three low achievers who were interviewed in depth. Four students’ mental models of acid and base are identified. The mental models and sources of students’ conceptions of acids and bases that influenced the high achievers are compared to those of the low achievers. We find that the teacher in the study made accurate anticipations of her students’ mental models in the case of the high achievers but inaccurate anticipations of the low‐achievers’ mental models and the diverse sources influencing their mental models. In addition, the teacher incorrectly attributed the poor achievement of the low‐achieving students to their intuition and underestimated the effects of her teaching on the achievement of these students. As a result, the teacher’s instruction reinforced the low‐achievers’ incorrect mental models. Finally, the different approaches for teaching students with different achievements are emphasized according to the empirical data in this study.     

滁州市酸雨化学组成特征及防治措施分析

对滁州市2006~2009年降水的化学组成特征进行了连续4年的监测。监测结果表明,滁州市2008年和2009年降水为酸性降水,其pH值分别为5.09和5.06,酸雨频率分别为10.4%和31.6%;其酸性降水季节变化较为明显,秋、冬两季较高,夏季次之,降水中SO42-/NO3-的比值范围0.50~1.42,呈上升趋势,表明滁州市酸雨类型正逐步由硫酸、硝酸并重型向硫酸型转变;降水中Ca2+、Mg2+浓度逐年增大,Ca2+、Mg2+对降水酸性的中和作用逐年提高。结合滁州市实际情况,提出了切实可行的防治措施和建议。     

酸腐蚀缓蚀剂研制及其性能考察

本文研制了适宜不同酸腐蚀用缓蚀剂。对其缓蚀效率进行了考察。试验结果表明其缓蚀效率均达到了以上。该缓蚀剂适用于锅炉及换热设备在化学清洗中抑制酸腐蚀。     

消除肌酐测定中两种干扰因素的探讨

目的：消除血红蛋白和胆红素两种因素对碱性苦味酸速率法测定肌酐的负干扰。方法：用苦味酸速率法测定未溶血、人为溶血、人为溶血后加0．88mol／L H2O2 37℃水浴20min、人为溶血后加0．88mol／L H2O2 37℃水浴30min、未溶血加0．88mol／L H2O2 37℃水浴20min五种处理的血液样品中肌酐值。结果：其他四组与第一组差异均有统计学意义（P〈0．01）;第三组与第二组、第五组测定结果有差别（P〈0．01或P〈0．05）,而第三组与第四组的测定结果则无差别（P〉0．05）。结论：用0．88mol／L H2O2处理溶血样品后,再进行肌酐测定。可消除血红蛋白和胆红素对肌酐测定的影响,使测定结果更真实。     

有关溶液pH的计算

结合化学教学实践,探讨了酸、碱、盐、缓冲溶液及溶液稀释时pH的计算方法及规律。     

绵羊血浆中阿维菌素的高效液相色谱法测定

测定绵羊血浆中阿维菌素的高效液相色谱法,在样本经乙酸乙酯提取分离后,直接用高效 液相色谱法进行测定(UV245nm),所测成分为阿维菌素B1a,流动相为乙腈:0.1％磷酸- 磷酸二氢钾缓冲液=65:35;检测波长:245nm;流速1.0ml.min~(-1)。     

不同烹调方法对蔬菜中抗坏血酸影响的研究

抗坏血酸主要存在于蔬菜和水果当中,根据我国人民的饮食习惯。大多数蔬菜需烹调后食用。笔者用民间常用的烹调方法对六种蔬菜进行处理,揭示了不同烹调方法对蔬菜中还原型抗坏血酸和总抗坏血酸的不同影响。