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Table of Content
24 December 1995, Volume 11 Issue 4
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Articles
Tb
3+
as Fluorescent Probe in the Study of the Interaction of Other Lanthanide Ions with Trichosanthin
HAO Qiang, LI Wen-lian, ZHANG Yan, YU Gui, YANG Hong, ZHAO Xu, YAO Qi-Zhi, LI Qing-shan
1995, 11(4): 279-283.
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The interaction of lanthanide (Ln
3+
)ions with trchosanthin(TCS)was investi-gated using Tb
3+
as fluorescent probe.The metal-binding sites of the protein were probed by means of adding the Tb
3+
into the protein solutions.If other Ln
3+
ions exist in the Tb
3+
protein complex system, they would compete against Tb
3+
in the binding sites of the protein, and so the fluorescence intensity of Tb
3+
decreased,which is called quenching effect.The quencliing effect is related to the ionic radii of the Ln
3+
ions and energy transfer from Tb
3+
protein to Ln
3+
ions.Based on the ex-perimental results,a schematic of the energy transfer from protein-Tb
3+
complex to protein-Ln
3+
complex is suggested.
Amperometric Sensors for Determination of Hydrogen Peroxide Based on Electron Transfer Between Horseradish Peroxidase and 1,1'-Dimethylferrocene
SUN Chang-qing, LUAN Chai-xia, YANG Xu, GAO Qian, XU Hong-ding, DU Wen-yuan
1995, 11(4): 284-290.
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A hydrogen peroxide electrode with 1,1'-dimethylferrocene(DMFc)used as an electron transfer mediator has been described.Using Nafion, DMFc was modified on a glassy carbon electrode(GCE)surface,and horseradish peroxidase(HRP)was then immobiliged on the DMFc-Nafion film,forming a HRp-DMFc-Nafion modi- fied electrode.The chracteristics of the sensor has been shown by cyclic voltam- metry and constant potential measurements,The sensor responds fastly to hydro- gen peroxide,the time required to reach 95%of the steady-state current is less than 50s.The sensor displays a sensitive catalytic current response to hydrogen peroxide and can be operated at a potential range in which the oxidation of common interfering species,such as ascorbic acid and uric acid,does not occur.The sensor is stable for 20 days and its detection limit is 1 μmol/L.
Quantitative Studies on Structure-Activity Relationships(QSAR)of Cytokinin-Active Phenyl Urea Derivatives(PUD)
QIAO Li-xin, LI Zheng-ming, YANG Hua-zheng, ZHAO Zhong-ren, ZHANG Dian-kun, LAI Cheng-ming
1995, 11(4): 291-298.
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The quantitative studies on structure and cytokinin activity of the cucumber cotyledon expansion reiationshps of 35 urea compounds were conducted using pl1ysico-chemical parameters of the substituents and regression analysis,The position-specific hydrophobic,steric and electronic effects of substituents are important to the activity.Acertain overlap of the optimum conformation of the ureido structure over Kinetin was observed.The coplanarity is discussed.
Preparation of Chelating Cellulose Filters and Their Application to the Separation and Enrichment of Trace Elements
LIU Chun-ming, GUO Yi-hang, ZHAO Xiao-liang, DING Lan
1995, 11(4): 299-305.
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Threekinds of chelating cellulose filters were prepared and ten trace elements were preconcentrated simultaneously on the microcolumn that was filled with the chelating cellulose filters.Alkali and alkaline earth metal ions were quantitatively separated as matrix elements at the selected pH values.The microcolumn has high enrichment factors and recoveries.
A Study on Molybdenite Electronic Structure
LONG Xiang-yun, WANG Feng-zhen
1995, 11(4): 306-311.
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The present paper covers thedectronic structure of Molybdenite（MoS
2
）with layer structure studied using tight-binding energy band structure calculation and localization molecular orbital CNDO/2 method,and the bonding characters of Mo-- Mo,S--S and Mo==Satomic pairs in MoS
2
crystal are discussed.
Determination of High Pressure Phase Diagrams of the Ternary Alloy System
SONG Li-zhu, YANG Hua, ZHAO Mu-yu, SHEN Zhong-yi, LIU Yong
1995, 11(4): 312-315.
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Several vertical sections of the phase diagram of Cd-Sn-Zn system with a constant mole fraction X
cd
=0.2 were determined by means of differential thermal anal-ysis（DTA）at high pres:ures 0.0,0.5,1.5,and 2.0 GPa respectively.The eutectic temperature of the system increases by about 50K from atmospheric pressure to the high pressure 2.0 GPa,but the ternary eutectic composition changes slightly with the pressure chnge.
Studies on Colloidal Properties of Mixed Metal Hydroxide-Clay Aqueous Suspension
NOU wan-guo, ZHANG Chun-guang, SUN De-jun, HAN Shu-hua, WANG Guo-ting
1995, 11(4): 316-322.
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The electrical property,stability and rheological property of mixed metal hydroxide(MMH)-clay aqueous suspensions were studied via determining elec- trophoretic mobilities,heterocoagulation and rheological parameters.The suspen- sions of MMH-Na-montmorillonite and MMH-Kaolinite may be transformed from negatively charged systems into positively charged systems through changing the ratio of MMHto clav.The increase of MMH content makes the stability of dilute MMH-clay suspensions decreased in negatively chrged systems and increased in positively chrged systems.The complete coagulations at near neutral systems oc- curs.In the concentrated MMH-clay suspension,the steric network structures may be formed between MMH and clay particles,which cause the apparent viscosity(AV)and Bingham yield point(YP) of the suspentqion to increase.There is a suit- able ratio of MMH to clay at which the AVand YPof the suspension attain a maximum value,which in agreement with “bridging theory”of polymer flocculation.
Studies of Catalysis in Partial Oxidation of Methane to Syngas(Ⅱ)──Chemisorbed Species,Energetics and Mechanism
CHEN Ping, ZHANG Hong-bin, LIN Guo-dong, TSAI Khi-rui
1995, 11(4): 323-335.
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The characteristic study,by means of in-situ IRspectroscopy, of chemisorbed species on the Ni-catalysts for the partial oxidation of methane（POM）to syngas demonstrated the existence of CH
x
（a）and H
x
CO（a）adspecies on the functioning Ni-catalysts, Several designed experimental investigations on the reactivities of methane with CO
2
and with O
2
,respectively,over the Ni-catalysts, and of CO
2
with the prereduced Ni-catalyst,ats well as of the deposited carbon with CO
2
and with O
2
,respectlvely,liave been carried out and the reLqults were unfavorable to the two-step mechanistic interpretation proposed for the POMreaction.By means of tlie BOC-MP Approach,energetics of a set of elementary reactions,which may be involved in the POM process,on the clean（111）surface of Ni,Fe,Cu and Pd, re- spectively,has been studied.The result;of the experiments and the calculation of the present work favor the direct catalytic dissociation-plus-surface oxidation-plus-further debdrogenation mechanism as the dominant pathway making major contribution to the POM reaction.
Effect of Substituting Group on the Calculated Nonlinear Second-Order Optical Susceptibilities of Substituted Thiophene Derivatives with Quinoidlike Conformation
LI Zhi-ru, WANG Xiao-peng, PENG Ji-kang, SUN Chia-chun
1995, 11(4): 336-341.
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Calculations of the nonlinear second-order optical susceptlbilities(β
ijk
)for sub- stituted tl1iophene derivative;with quinoidlike conformation are reported.These systetems possess small dipole moment;and large differences between dipole mo- ments of ground and first-excited states.Geometry optimizations of the molecules investigated were carried out using AM1 method.The calculations were performed using INDO/CImethod comboned with a sum-over-states expression for β
jik
.The calculated results sbw that the second-order susceptibility is a function of the na- ture and location of substituents and is larger for disubstituted molecules than monosubstituted molecules.Bipolymeric thiophenemetmne with NH
2
/NO
2
groups was calctilated to have a β
μ
of 79.920 × 10
-30
esu.It was found that the NH
2
and NO
2
groups in above disubstituted molecules are pull-pull groups in ground states,but are usual push-pull groups in the first excited states.
Preparation and Characterization of Polymer-Supported Rare Earth Complexes
YU Guang-qian, LI Yu-liang, Ll Xiao-li
1995, 11(4): 342-353.
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The polymers containing different ligand groups of atoms(mainly O,N,and S)and their rare earth complexes were prepared,characterized and classified based on the type of metal-ligand bonding.The catalytic activities of the complexes are briefly discussed.The polymer- supported rare earth complexes shwed much greater activities than the correspond- ing complexes with a low molecular weight.
Preparation,Characterization and Catalytic Activity of Anionic Clay Pillared by GaW
9
Zn
3
ZHAHG Ji-yu, ZHANG Shu-yun, YU Xin-wu, HU Chang-wen, Liang Zhao-jun, WANG En-bo
1995, 11(4): 354-356.
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Synthesis and Characterization of a Novel Gallophosphate with Ethylene Glycol
KAN Qiu-bin, XU Ru-ren, Glasser F. P.
1995, 11(4): 357-359.
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Synthesis and Crystal Structural Characterization of（NH
4
)
5
H
3
Mn
3
V
12
O
40
·15H
2
O
WANG Zuo-Ping, LIU Jing-fu, WANG En-bo
1995, 11(4): 360-363.
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Syntheses of Ferrierite and Mordenite Zeolites from Dried Gel in Alcoholic System
DU Hong-bin, QIU Shi-lun, PANG Wen-qin
1995, 11(4): 364-366.
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A New Route to Syntheses of Zeolite Beta
DONGXue-yan, LI Shou-gui, PANG Wen-qin
1995, 11(4): 367-369.
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Studies on Glycosides(Ⅺ)──A Convenient Stereoselective Synthesis of 1-
O
-Aryl-α-
D
-glucopyranosides from Glucosyl Trimethylsilyl Ether
LI Zhong-jun, QIU Dong-Xu, WANG Yan-feng, CAI Meng-Shen
1995, 11(4): 370-372.
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Editor-in-Chief:
Jihong YU
ISSN 1005-9040
CN 22-1183/O6
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