含铜催化剂对柴油机排气颗粒物的氧化

自制含铜催化剂Cu-K-V[-Me(Me=Pt,MnO2,NiO或SnO2)]／TiO2／γ-Al2O3／堇青石,将其与小型柴油发动机排气中的颗粒物混合后,利用DSC和TG等测试技术,研究各种催化剂的活性．DSC测试结果表明,添加了Sn的催化剂可使可溶性有机组分SOF的起燃温度降为432．62K,无催化剂活性组分时对应的温度则为523．27K;含Ni催化剂使石墨化固体组分GSF的燃烧温度降为687．97K,而颗粒物完全燃烧的温度仅为766．88K．TG测试结果显示,含Ni催化剂在700．65K下对颗粒物的净化效率为90．83％,含Pt催化剂在710．05K下对应的净化效率为91．6％,含Sn催化剂在725．65K下的净化效率也达81．7％．在发动机实际排气净化实验中,含Sn催化剂对颗粒物的削减率最高可达38％,略高于商业催化剂的净化效率(20％-35％)．     

Mosquito (Diptera: Culicidae) fauna of the Iranian islands in the Persian Gulf

Mosquitoes of four Iranian islands (Abu-Musa, Hormuz, Larak and Qeshm), Hormozgan Province of southern Iran, were surveyed between 2005 Madison DR, Madison WP. 2005. MacClade 4.08 [Internet]. Sunderland (MA): Sinauer Associates, Inc. http://macclade.org/index.html  [Google Scholar] and 2007 Tamura, K, Dudley, J, Nei, M and Kumar, S. 2007. MEGA4: Molecular Evolutionary Genetics Analysis (MEGA) software version 4.0. Mol Biol Evol., 24: 1596–1599. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]. In 521 specimens collected, 14 species belonging to four genera were identified: Anopheles culicifacies Giles sensu lato (s.l.), An. dthali Patton, An. fluviatilis James s.l., An. stephensi Liston, An. turkhudi Liston, Culex bitaeniorhynchus Giles, Cx. perexiguus Theobald, Cx. pseudovishnui Colless, Cx. quinquefasciatus Say, Cx. sitiens Wiedemann, Cx. theileri Theobald, Cx. tritaeniorhynchus Giles, Culiseta longiareolata (Macquart) and Ochlerotatus (= Aedes) caspius (Pallas) s.l. This is the first record of all of these species on the islands. Cytochrome c oxidase I (COI) barcode sequences were used to confirm the taxonomic identity of An. stephensi, Cx. quinquefasciatus and Oc. caspius s.l. from the islands and mainland of Hormozgan Province, with genetic isolation noted in both Oc. caspius s.l. and Cx. quinquefasciatus samples collected in Abu-Musa Island. Morphological anomalies in island specimens of Cx. quinquefasciatus and Cx. pseudovishnui are discussed.     

Mitochondrial association of alpha-synuclein causes oxidative stress

α-Synuclein is a neuron-specific protein that contributes to the pathology of Parkinson’s disease via mitochondria-related mechanisms. The present study investigated possible interaction of α-synuclein with mitochondria and consequences of such interaction. Using SHSY cells overexpressing α-synuclein A53T mutant or wild-type, as well as isolated rat brain mitochondria, the present study shows that α-synuclein localizes at the mitochondrial membrane. In both SHSY cells and isolated mitochondria, interaction of α-synuclein with mitochondria causes release of cytochrome c, increase of mitochondrial calcium and nitric oxide, and oxidative modification of mitochondrial components. These findings suggest a pivotal role for mitochondria in oxidative stress and apoptosis induced by α-synuclein. Received 27 December 2007; received after revision 7 February 2008; accepted 8 February 2008     

关于同余式组解的一般表达式

本文去掉孙子定理中同余式组的模为互素的限制,在有解的情况下,给出同余式组 x=C_i(mod m_i),i=1,…,n 解的一般表达式,从而,推广了孙子定理。     

两种不同商品饲料对BALB/c小鼠生长和繁殖性能的影响

目的比较两种小同营养水平的商品饲料对BALB/c小鼠生长和繁殖性能的影响,为实验小鼠生产中合理使用饲料提供科学依据。方法选择BALB/c母鼠32只、仔鼠18窝以及生长鼠20只,分别随机分为2组,饲喂A、B两种不同营养水平的商品饲料,测定母鼠窝产仔数、连胎率,仔鼠0~3周窝重以及生长鼠4~10周体重等指标,并进行统计学分析。结果营养水平略高的A饲料有利于提高BALB/c小鼠连胎率及其仔鼠生长性能,但对窝产仔数和生长鼠后期的生长性能无显著影响。     

洞庭湖区湿地生物资源评价及开发利用

洞庭湖湿地是我国最大的淡水湖泊湿地之一,生物资源十分丰富,其中植物1428种,鸟类216种,鱼类119种,哺乳类22种,两禁爬行类27种,本分析了洞庭湖湿地生物资源的特征,并进行了定性评价,指出了洞庭湖湿地生物资源利用状及存在的主要问题,并就今后本区湿地生物资源的保护和利用提出了一些构想。     

PTC热敏电阻型液位控制电路的研究

在研究PTC热敏电阻特性的基础上,对现有的金属电极型液位控制电路进行改进,提出了一种采用PTC热敏电阻作为传感元件的液位控制电路,克服了原液位控制电路的缺点。     

HgBa2CaCu2O6+δ的内层电子激发能的密度泛函理论研究

运用相对论的自旋极化局域密度函数方法计算了HgBa₂CaCu₂O_6+δ的电子结构。得到的内层电子激发能基本上与X光电子谱一致,其中自旋-轨道劈裂值与实验符合得尤其好。