电感耦合等离子体发射光谱法测定水中的总磷

建立了ICP-OES测定水中总磷的方法,并对最佳测试条件的选择进行了探讨.在优化条件下,总磷的校准曲线在0.1010mg/L范围内有良好的线性关系.在低、中、高3个添加水平,总磷的回收率为97.5％-101％,相对标准偏差为1.18％-2.13.本方法检出限为0.012mg/L.     

Theoretical Studies on Stabilities of C26BN Isomers

The possible stable stractures of substituted fullerene C26BN formed on the initial C28 cage with Td symmetry have been systematically studied on UHF/3-21g level with constrained syrnmetry(Cs or C1, the charge and multiplicity of all the isomers are zero and five, respectively.The geometry optimization and the vibrational frequencies analysis were performed on the same level with constrained symmetry(Cs or C1. The results show that the most stable isomer of C26BN is formed by boron and nitrogen atoms doping at 5,2-sites.     

Photo-CIDNP evidence for charge-transfer interaction between synthetic water-soluble porphyrins and guanine

Abstract Photoreactions of aqueous solutions of synthetic water-soluble porphyrins were studied by the ¹H and ¹³C CIDNP technique. Strong polarizations, which were very sensitive to the presence of added acid, were observed on the cationic porphyrins (TMePyPH₂-TAPPH₂) when irradiated through continuous UV-visible light. They resulted from the reverse electron transfer between the semi-oxidized and the semi-reduced species of the derivative. When the experiments were carried out in the presence of nucleobases, guanine (and its derivatives) was the only residue that was polarized. This is thoroughly interpreted in terms of a reversible electron transfer reaction leading to guanine photooxidation by the porphyrin excited triplet state. It was shown to be drastically pH-dependent and was correlated to the redox potential of the porphyrin. It was not affected by the incident wavelength. The reaction proceeded through the intermediate formation of the correlated radical-ion pair: porphyrin radical anion-guanine radical cation. This study suggested that a Type I (free radical) reaction could be one of the primary processes in DNA photosensitization by porphyrins.     

GC-MS测定西瓜皮中的挥发性成分

西瓜经水蒸汽蒸馏，乙醚萃取挥发性成分，通过气相色谱－质谱联用（ＧＣ－ＭＳ）测定，发现西瓜皮中含有４２个组分，确定了其中１９个组分的结构。     

D-氨基葡萄糖、α-甘氨酸金属混配物的研究

报道了D－氨基葡萄糖，α－甘氨酸与Cu(Ⅱ),Zn(Ⅱ),Fe(Ⅲ），Co(Ⅲ),Ni(Ⅱ)形成的混配物的合成方法，通过元素分析，IR，UV－Vis,1HNMR,13CNMR等手段对配合物进行了表征。采用Pryrogallol-NBT比色法对化合物清除超氧自由基（O2－）的能力进行了测试，结果表明各配位体对超氧自由基（O2－）均有一定的清除作用。     

日本梅花品种的筛选及嫁接技术研究

对引进的23个日本梅花品种的成活率、生长势、着花状况、花色及花期天数等5个指标进行了研究，从中筛选出7个生长性状优良、适合宁波地区推广的日本梅花品种；对选出的品种分别进行“T”字形芽接和切接的嫁接技术研究，总结出一套适合宁波地区操作的日本梅花品种嫁接技术．     

广义Ramanujan-Nagell方程x~2+D~m=p~n的解数

设a是正整数,D=3a2+1,P=4a2+1,其中p是素数.本文证明了:如果a不是4的倍数,则除了当(D,p)=(4,5)时方程x2+Dm=pn恰有3组正整数解(x,m,n)=(1,1,1),(3,2,2),(11,1,3)以外,该方程恰有2组正整数解(x,m,n)=(a,1,1)和(8a3+3a,1,3).     

基于Autodock和蛇PLIγ设计短肽sPLA2抑制剂

天然的分泌型磷脂酶A2(Secretory phospholipase A2,sPLA2)抑制蛋白主要是蛇磷脂酶A2抑制蛋白γ(Snake phospholipase A2inhibitor proteinγ,PLIγ)。通过分析华游蛇PLIγ序列的结构特点及活性区,设计短肽PLA2抑制剂。运用Autodock分子对接软件,分析短肽与sPLA2的相互作用,通过pH动态监测法验证其抑制活性。设计得到的CPGV肽可以与sPLA2的疏水性活性中心结合,该四肽对蛇毒sPLA2的活性抑制率为69.12%。通过生物信息学和分子对接模拟筛选,成功地设计了PLIγ的活性肽。     

响应面分析法优化稻壳灰制备纳米级白炭黑工艺

以稻壳灰为原料经过生产水玻璃的中间环节制备纳米级白炭黑,利用响应面软件设计试验,并建立数学模型,在分析各个因素的显著性和交互作用后,得出反应的最佳条件:水玻璃浓度为15 Be,反应温度为54℃,硫酸浓度为0.6 mol/l,反应终止时pH为6,反应时间为62 min,所得产品的粒度平均为70     

双波长荧光雷达探测大气生物气溶胶的性能分析

生物气溶胶在大气中扩散极易传播和发生各种流行疾病,也是生物武器投放的主要形式,实现生物气溶胶实时、远距离的探测显得尤为重要。构建了一台双波长荧光雷达用于大气中生物气溶胶的预警和识别。该雷达系统采用Nd∶YAG固体激光器作为激励光源,基频1 064 nm、四倍频266 nm作为工作波长。基于激光诱导荧光雷达探测原理,对红外波段的弹性散射信号和紫外波段诱导的荧光信号进行数值分析。结果显示,在探测误差小于10%的情况下,距离为1.0 km时,单激光脉冲测量得到白天和夜晚细菌孢子的最小探测浓度分别为15 100个颗粒·L-1和8 386个颗粒·L-1;当脉冲数累加到10 000时,白天和夜晚的细菌孢子最小探测浓度显著改善,分别为144个颗粒·L-1和77个颗粒·L-1。分析结果还表明,通过红外波段确定细菌孢子云团位置后,为了提高系统对细菌孢子的探测性能,可增加紫外激光脉冲数量,延长荧光信号采集时间。