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In this paper the authors establish the concept of generalized ball-intersection (GBI) and prove that an injective metric space is freely contractible to its each GBI, which generalizes a result of Isbell from a point to a GBI. 相似文献
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IntroductionOwingtotheformationofstableanddeeplycoloredcomplexeswithheavymetalions(suchaslead(Ⅱ)etc),theferrocenylaroylhydrazonesarenotonlypotentiallyusefulasspe-cificreagentsinanalyticalandextractivechemistry[1]butalsostronglyactivebiologically,andc… 相似文献
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催化动力学光度法测定锅炉给水中异抗坏血酸钠 总被引:1,自引:0,他引:1
基于催化动力学过程,研究了新型锅炉给水除氧剂异抗坏血酸钠的分光光度法测定。试验表明,这一方法操作简便,快速、准确提高,可测至5μg.L^-1异抗坏血酸钠。 相似文献
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ZHONG Gui yun LIU Hua XIE Qing lan * Institute of Elemento organic Chemistry Nankai University Tianjin P. R. China 《高等学校化学研究》2002,18(3):277-279
IntroductionThe drug- molecules are called as silyl- drug ifasilicon atom replaced one carbon atom of theorganic- drugs.Generally,they have low toxicityand pro- long efficiency.Many methods have beendesigned in order to decrease the toxicity oforganotin compounds and organosilicon which hasbeen proved to be effective.Torque[1] is a newacaricide made by America Shell Company,itsmolecular formula is [( Ph Me2 Si CH2 ) 3 Sn]2 O.Tacker[2 ] synthesized the compounds( Ph Me2 Si CH2 ) 3 Sn X[… 相似文献
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Study of Static Adsorption Capacity of ACF for Xenon at 201 K 总被引:2,自引:0,他引:2
WANG Ya long ** ZHANG Hai tao WANG Xu hui ZHANG Li xing CHEN Li yun XIE Jin chuan 《高等学校化学研究》2002,18(2):216-220
IntroductionTheradioxenonsarenuclearfissionproducts .AccordingtotheComprehensiveNuclear Test BanTreaty (CTBT) ,thenucleareventswhichviolatethetreatymaybefoundbymonitoringradioxenonsinglobalatmospherewithInternationalMonitoringSys tem(IMS) .However ,allxenons… 相似文献
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GOU Xiao jun LI Chun lei KONG Xiang duo ZHU Shi zhen ZHANG Hong ying WANG Xiao ping ZHANG Jin * LIU Tian yun . Key Lab for Molecular Enzymology Engineering of Ministry of Education Jilin University Chan 《高等学校化学研究》2002,18(3):294-298
IntroductionSuperoxide dismutases play an important rolein organisms′ defense against highly reactiveoxygen species by removing the superoxideanions[1— 3 ] . According to their metal cofactor,three differentclasses of superoxide dismutases canbe distinguished:Cu,Zn- SOD,Fe- SOD and Mn-SOD. These three SODs are different in thephylogenetic distribution pattern,prokaryotescontain Mn- SOD,Fe- SOD or both,and Cu,Zn-SODs in the cytosol and peroxisomes of eukaryotesand homologous prote… 相似文献
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一种水中可溶性导电聚苯胺的制备与表征 总被引:2,自引:0,他引:2
分别以聚乙二醇(PEG)的水、乙醇溶液为反应媒介, 制备了Keggin结构杂多酸(H4SiW12O40)掺杂的导电聚苯胺材料. 此聚苯胺经IR, XRD, UV-Vis光谱进行了表征, 并采用标准的四探针法对其电导率进行了测定. 同时系统地研究了杂多酸、氧化剂和单体的比例、反应混合体系温度的改变等对所合成聚苯胺的产率、导电率、水中溶解性等方面的影响. 结果表明, 在PEG乙醇溶液中制备的聚苯胺比在水溶液中制备的有较高的产率、电导率和溶解率. 其最高电导率可达到1.87 S/cm, 溶解率可达53%. 相似文献
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