Synthesis and bioactivity of novel coumarin derivatives containing(E)-methyl 2-(methoxyimino)-2-phenylacetates

Ten coumarin derivatives containing(E)-methyl 2-(methoxyimino)-2-phenylacetate were synthesized and bioassayed.The compounds were identified by IR,~1H NMR and elemental analyses.The test results indicated that compound 5j(R~1 is methyl and R~2 is n-C_6H_(13)) was the optimal structure in this paper with good fungicidal activity against CDM(85%) at 6.25 mg/L concentration.     

Effect of sterilization on non-woven polyethylene terephthalate fiber structures for vascular grafts

Non-woven polyethylene terephthalate (PET) fibers produced via melt blowing and compounded into a 6 mm diameter 3D tubular scaffold were developed with artery matching mechanical properties. This work compares the effects of ethylene oxide (EtO) and low temperature plasma (LTP) sterilization on PET surface chemistry and biocompatibility. As seen through X-ray photoelectron spectroscopy (XPS) analysis, LTP sterilization led to an increase in overall oxygen content and the creation of new hydroxyl groups. EtO sterilization induced alkylation of the PET polymer. The in vitro cytotoxicity showed similar fibroblastic viability on LTP- and EtO-treated PET fibers. However, TNF-α release levels, indicative of macrophage activation, were significantly higher when macrophages were incubated on EtO-treated PET fibers. Subcutaneous mice implantation revealed an inflammatory response with foreign body reaction to PET grafts independent of the sterilization procedure.     

Precise control and consecutive modulation of spin transition temperature using chemical migration in porous coordination polymers

Precise control of spin transition temperature (T(c)) is one of the most important challenges in molecular magnetism. A Hofmann-type porous coordination polymer {Fe(pz)[Pt(II)(CN)(4)]} (1; pz = pyrazine) exhibited cooperative spin transition near room temperature (T(c)(up) = 304 K and T(c)(down) = 284 K) and its iodine adduct {Fe(pz)[Pt(II/IV)(CN)(4)(I)]} (1-I), prepared by oxidative addition of iodine to the open metal sites of Pt(II), raised the T(c) by 100 K. DSC and microscopic Raman spectra of a solid mixture of 1-I and 1 revealed that iodine migrated from 1-I to 1 through the grain boundary after heating above 398 K. We have succeeded in precisely controlling the iodine content of {Fe(pz)[Pt(CN)(4)(I)(n)]} (1-In; n = 0.0-1.0), which resulted in consecutive modulation of T(c) in the range 300-400 K while maintaining the hysteresis width. Furthermore, it was demonstrated that iodine migration in the solid mixture was triggered by the spin transition of 1-I. The magnetically bistable porous framework decorating guest interactive open-metal-site in the pore surface makes it possible to modulate T(c) ad arbitrium through unique postsynthetic method using iodine migration.     

CONCENTRATION, SOURCE OF MANGANESE AND IRON IN FERROMANGANESE NODULES AND THE RELATIONSHIP BETWEEN NODULES AND SEDIMENTARY ENVIRONMENTS IN NORTH PACIFIC REGION

The concentration, source of manganese and iron in ferromanganese nodules and therelation between nodules and sedimentary environments are discussed in detail by asynthetical study on chemical information of ferromanganese nodules and correspondingsediment, pore water and geological, biological (bacteria) information in 26 stations fromthe North Pacific region (7- 13°N, 178- 165°W). The result shows that (i) the concen-tration and distribution characteristics of magnese and iron in ferromanganese nod-ules differ in different types of nodules, however, the concentration decreases with theincrease in grain sizes of nodules; (ii) the source of iron in different types of nodulesis basically the same, i. e. the slow sedimentation of overlying water; (iii) manganesein nodules comes mainly from the diffusion of Mn~(2+) in the pore water, and Mn~(2+) fromthe reduction of Mn~(4+) in sediments by the medium of bacteria. As the distribution of bac-teria is believed to be strongly affected by the sedimentary envi     

The effect of different variables on the accelerated and natural weathering of agricultural films

Lifetimes required for greenhouse cover films depend heavily on the country, especially the tradition in the country. They vary from one agricultural season (i.e. 6-9 months) to several years and are strongly dependent on the use of pesticides which destroy the photostabilisers (HALS and nickel quenchers) and on other geographic and climatic factors (solar irradiation, temperature, winds, etc.).In this work, we have measured the duration of four real agricultural films using the European Standard EN 13206:2001 conditions for the accelerated weathering test and the results have been compared to their duration under accelerated weathering using more aggressive conditions (pesticide spraying, different chamber temperatures) and under natural weathering. We have also explored the effect of the backing material in the artificial weathering test and of the starting date in the natural weathering. The final goal of this study is to obtain good correlations between accelerated weathering, natural weathering at defined, controlled conditions and weathering in real-use conditions for agricultural films.     

空间群O_h~7O~4T~2母分系数的计算

在群链G G_1 G_2中,把两个子群的IR(不可约表示)基相乘,然后把乘积基耦合成IR基,耦合系数我们称之为母分系数。本文把陈金全创立的本征函数法用于计算空间群的群链O_h~7 O~4 T~2的母分系数,计算的结果显示母分系数是满足正交关系,同时也说明此方法是适用的。     

一起简易换热容器事故分析

由于生活需要将一台原用于储气的立式储气罐改造为一台卧式换热器，因操作不当，导致筒体焊口撕裂。针对这一事故进行分析研究，并对换热器筒壁撕裂处进行了强度校核，指出了压力容器在改造过程中，只有遵守国家有关标准要求，才能保证使用中避免事故的发生。     

激光光栅多普勒效应微小振动测量

为了提高测量微小振动的精度和动态范围，提出一种基于激光光栅多普勒效应的微振动测量系统。通过对差拍信号的频率分析，以峰值频率比值的方法可以排除干扰获得被测振动频率，找到振动的翻转点并判断振幅的大小；推导了在翻转点附近的微小位移与电压值的关系，对于小于计数当量值的位移由测量电压得到，提高了微小振动位移的测量精度以及系统测量的最小分辨率、动态范围。实验系统的频率范围为0．5～500Hz，振幅为20～10mm，相对误差小于1％，其动态范围大于100dB。     

东北地区聋哑发病情况的调查

聋哑发病率及病因的调查,对防治聋哑有重要意义。1970～1972年我们对沈阳、大连市和喀左、铁岭等县的部分地区进行调查。在913,023人中,发现聋哑3,048人,占3.33‰,且农村聋哑发病率高于城市,农村的山区高于半山区,半山区高于平原地区。如按我们词查的发病率推算,我国聋哑病人可能超过300万;聋哑患病年龄在6岁以内者占90.55％。本文材料中先天性聋哑占12.61％,比过去各调查材料低,这与确定先天性聋哑的依据以及调查年代、地区等条件有关;后天性聋哑病在农村多为传染性疾病所致,而在城市则多以药物中毒引起。前庭功能检查中,先天性聋哑丧失前庭功能者占33.3％。后天性聋哑丧失前庭功能者占78.6％,先天性聋哑前庭功能丧失的比例明显大于后天性聋哑。但后天性聋哑中也有5.7％是前庭功能正常者。因此,不能以前庭功能是否改变做为区分先、后天性聋哑的依据。     

我国辽宁林区四个球蛛新种记述（蜘蛛目：球蛛科）

本文记述了辽宁林区四个球蛛新种，种名为：双孔球蛛Theridion biforaminum Gao et Zhu,sp.nov.,桓仁球蛛Theridion huanrenensis Zhu et Gao,sp.nov，新月球蛛Theridion lunulatum Guan-et Zhu,sp.nov.,蛇突球蛛Theridion serpatusum Guan et Zhu,sp.nov.模式标本保存要河北教育学院。