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Table of Content
24 December 2002, Volume 18 Issue 4
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Articles
A New Organo-templated Layered Zincophosphate Synthesized from a Solvothermal System Containing Racemic1,2-Diaminopropane
CHEN Wei, YUAN Hong-ming, JIANG Yu-sheng, HUO Hua, CHEN Jie-sheng
2002, 18(4): 375-379.
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A new layered zincophosphate was synthesized under solvothermal conditions by employing racemic 1,2-diaminopropane as the structure-directing agent. The structure of the compound was solved by means of single-crystal X-ray diffraction analysis. It crystallized in the monoclinic space group P2
1
/c (No. 14) with a=1.047 0(3) nm, b=0.787 31(18) nm, c=0.662 68(16) nm, β=103.120(5)°, V=0.532 0(2) nm
3
and Z=4. The structure is made up of anionic zincophosphate sheets stacked in an AAAA sequence. The individual sheet contains three- and four-membered rings and the infinite Zn-O-Zn chains can also be envisaged in the sheet. The charge-balancing diprotonated racemic 1,2-diaminopropane cations are sandwiched between the layers, whereas the inorganic layers are stabilized by strong H-bonds formed between the N atoms of the amine and the O atoms in the inorganic sheets.
Reviews
Synthesis and Characterization of Titanosilicate with the Structure of Umbite
ZHAO Yong-nan, LI Ya-feng, ZOU Yong-chun, MAI Zhen-hong, PANG Wen-qin
2002, 18(4): 380-384.
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A zeolitic titanosilicate with the composition of K
2
TiSi
3
O
9
·H
2
O, a structural analogue of natural mineral umbite K
2
ZrSi
3
O
9
·H
2
O, was hydrothermally synthesized in the SiO
2
-TiO
2
-K
2
O-H
2
O system and characterized by means of powder X-ray diffraction, SEM, IR and thermal analysis. The effects of TiO
2
/SiO
2
and OH
-
/SiO
2
ratios on the crystallization of the umbite were discussed. The influence of the organic additives on the morphology of the crystal was also investigated and the crystals with different shapes were obtained.
Articles
Hydrothermal Synthesis and Characterization of a Novel Supramolecular Network Compound [Co(IN)
2
(H
2
O)
4
](IN=Isonicotinate)
JIA Hong-bin, YU Jie-hui, DING Hong, XU Ji-qing, YE Ling, JING Wei-jie, WANG Tie-gang, XU Jia-ning, QU Xue-jian, LI Zeng-chun
2002, 18(4): 385-388.
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A novel supramolecular compound, [Co(IN)
2
(H
2
O)
4
](1), was synthesized by means of the hydrothermal method and its structure was characterized with elemental analysis, FT-IR spectrum, TGA and X-ray diffraction. Though the unit cell structure of the title compound is only monomeric, all these units as building blocks are assembled into a novel three-dimensional supramolecular network via the widely hydrogen-bonding and π-π stacking interactions.
FTIR Studies on NO Adsorption on [Co+Mg(Sr)]/ZSM-5
ZHU Chong-ye, LEE C. W., CHONG P. J.
2002, 18(4): 389-392.
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The adsorption of NO on [Co+Mg(Sr)]/ZSM-5 zeolites with different [Co+Mg(Sr)] contents was studied by means of FTIR spectroscopy. The dominant NO species adsorbed on [Co+Mg(Sr)]/ZSM-5 was found to be in a dinitrosyl form, as demonstrated by the IR bands at 1 813 and 1 896 cm
-1
. NO was adsorbed in a mononitrosyl form as shown in the region of 1 937-1 939 cm
-1
as a minor species. Samples [Co+Mg(Sr)]/ZSM-5 showed a new band near 1 858 cm
-1
(w) attributable to the species of Co
3
O
4
-NO. It was found that zeolite [Co+Mg(Sr)]/ZSM-5 exhibits superior performance characteristics for SCR of NO molecules, and is promising as a useful catalyst. The typical catalyst [Co+Mg(Sr)]/ZSM-5 for SCR resulted from the collaboration of the metal alkalinity and the ionic radius of the metal(such as Mg or Sr).
Studies on the Syntheses and Biological Activities of 3-Aryl-6-(1,1'-biphenyl-4-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazines
YE Xiao-qin, ZHANG Li-xue, ZHANG An-jiang, CHEN Xian-xing, ZHANG Zi-yi
2002, 18(4): 393-396.
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A series of novel 3-aryl-6-(1,1'-biphenyl-4-yl)-7H-1,2,4-triazolo[3,4-b][1,3,4 ]thiadiazines was synthesized by means of the reactions between 3-aryl-4-amino-5-mercapto-1,2,4-triazoles and 2-bromo-4'-phenylacetophenone. The structures of all the title compounds have been confirmed by virtue of elemental analysis, IR,
1
H NMR,
13
C NMR and mass spectra. The characteristics of
13
C NMR peaks of the compounds were investigated. The plant growth regulating effects of those compounds were also determined.
Synthesis of (R)(E)-3,7-Dimethyl-2-octene-1,8-dioic Acid, a Copulation Released Pheromone Component of Azuki Bean Weevil
YU Guang-ao, HUANG Jin-xia, HOU Jun-li, Li Yan, XU Zhang-huang
2002, 18(4): 397-399.
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Started from 5-hydroxy-2-pentanone, (R)(E)-3,7-dimethyl-2-octene-1,8-dioic acid, callosobruchusic acid, was synthesized via five steps with D-(-)-camphor sultam as the chiral auxiliary. It was of good optical purity and yield.
Regio-and Stereo-selective Reductions of Steroidal 4-en-3,6-dione
CUI Jian-guo, ZENG Long-mei, SU Jing-yu, LIN Cui-wu
2002, 18(4): 400-404.
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The different regioselective and stereoselective products were obtained by the reduction of stigmast-4,22-dien-3,6-dione with NaBH
4
-CH
3
OH when different kinds of metal ions was added to the reaction.
Synthesis, Structure and Characterization of a Novel Asymmetrical Half-sandwich Binuclear Iron Carborane Complex [η
5
-C
5
H
3
(t-Bu)
2
]
2
Fe
2
(CO)
3
Se
2
C
2
B
10
H
10
LU Shi-xiang, JIN Guo-xin, HU Ning-hai, JIA Heng-qing
2002, 18(4): 405-408.
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Halfsandwich iron dicarbonyl complex [η
5
-C
5
H
3
(t-Bu)
2
]Fe(CO)
2
Cl(1) reacts with 1, 2-dilithium diseleno carborane Li
2
Se
2
C
2
B
10
H
10
(2) to give a binuclear iron carborane complex [η
5
-C
5
H
3
(t-Bu)
2
]
2
Fe
2
(CO)
3
·Se
2
C
2
B
10
H
10
(3). The X-ray diffraction analysis of complex 3 reveals that one of the iron atoms is chiral.
Hydrolysis Reactions and Resolution of (±)-2-Acetamido-3-hydroxy-1-(4-nitrophenyl)-1-propanone
YANG Hui, QIU Guo-fu, FENG Xi-chun, HE Jian-she, HU Xian-ming
2002, 18(4): 409-411.
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The hydrolysis reaction of (±)-2-acetamido-3-hydroxy-1-(4-nitrophenyl)-1-propanone[(±)-1], an intermediate of chloramphenicol, was studied and three different products were obtained respectively under different reaction conditions. The resolution of hydrolysis product (±)-2-amino-3-hydroxy- 1-(4-nitrophenyl)-1-propanone[(±)-3] was carried out. A process of crystallization-induced asymmetric transformation was observed and up to 76% of the optically pure enantiomer was obtained in the resolution of (±)-3.
Reaction of Crossed Diperoxidation Between Cyclic Ketones and Alkyl Ketones
XU Wei-liang, FU Cheng-ling
2002, 18(4): 412-413.
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The reaction of crossed diperoxidation between the cyclic ketones and the alkyl ketones was investigated. The reaction is a competing in different ketones. It is slightly favorable to resulting in crossed ketone diperoxide and to resulting in crossed cycloketone diperoxide when the cycloketone reacts with the aliphatic ketone.
A New Approach to Inducing Silicon Tethered Ring-closing Metathesis Reactions
YANG Hong-li, VAULTIER Michel
2002, 18(4): 414-418.
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Ring-closing metathesis reactions involving diallyldiphenylsilane and diallyloxydiphenylsilane were successfully performed by using only 0.01 mol or even less of Grubbs' catalyst 1. The effects of reaction parameters, such as solvents, temperature and concentration of the catalyst are discussed.
Analysis of Mitochondrial DNA from the Ancient Tombs of Turfan
CUI Yin-qiu, DUAN Ran-hui, LIU Shu-bai, JI Chao-neng, ZHU Hong, LI Wei, MAO Yu-min, ZHOU Hui
2002, 18(4): 419-423.
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MtDNA was successfully extracted from ten individual bones (femurs) in the tombs of ancient Jushi in Turfan basin, dated back to the year about 3 000-2 500 years ago. By means of four overlapping primers, we got nucleotide sequence of the 218bp length. Ancient mtDNA was analyzed by the sequencing of hypervariable region Ⅰ of the mtDNA control region. The result shows that 9 haplotypes with 24 polymorphic sites were obtained. The phylogenetic analysis indicated that Mongolians and Altai are the population genetically closest to the Jushi groups and Jushi mtDNA pool being an admixture of eastern Asian and European lineages. So our preliminary data imply that an ancient mingling of Euro-Asian population had existed in Turfan basin prior to the early Iron Age.
Studies on Thermal Stability and Fluid Property of PVC Filled with Hydrotalcite
ZHANG Qiang, LU Jie-bin
2002, 18(4): 424-426.
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Hydrotalcite can act as a co-stabilizer with other main stabilizer for poly(vinyl chloride)(PVC). The thermal stability and fluid property of PVC filled with hydrotalcite surface-treated with titanate and silane were studied in this work. Organic Sn is a main stabilizer and hydrotalcite is a stabilizing assistant. The stability of the PVC resin mixed with organic Sn and hydrotalcite is better than that of the PVC resin mixed with organic Sn alone. It is shown that the PVC resin filled with hydrotalcite possesses a better static and dynamic heat stability. Moreover, hydrotalcite can improve the fluid property of PVC, which is advantageous to the processing of PVC, and the optimum content of hydrotalcite is about 1%-2%(mass fraction).
Excess Molar Volume of Binary Mixtures of Methylheptenone+ Alkanols at 298.15 K
XIAO Xi, LI Hao-ran, WANG Cong-min, WANG Qi, HAN Shi-jun
2002, 18(4): 427-429.
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Excess molar volume(V
E
) data on binary liquid mixtures of methylheptenone (MHO) with methanol, ethanol, n-propanol or n-butanol have been determined from the density measurements at 298.15 K and atmospheric pressure. The values of V
E
in all the systems over the entire composition range are quantified by the Redlich-Kister equation. The effects of the chain length of alkanols on V
E
are discussed.
Interactions of Cd Ions with Salmon Sperm DNA
CHEN Xia, JIN Jian, YANG Wen-sheng, JIANG Lin, XU Li, LI Tie-jin
2002, 18(4): 430-432.
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The effect of Cd ions on salmon sperm DNA was studied by means of circular dichroism(CD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and fluorescence spectroscopy. The CD spectral and fluorescent probe-acriflavine results indicate that the DNA underwent a conformation change upon the addition of Cd ions. XPS and Raman studies reveal that there existed interactions between Cd ions and the phosphate groups of the DNA. In addition, a new band appeared at 803 cm
-1
in the Raman spectra, which can be attributed to characterizing "marker" band of A-DNA. It is concluded that Cd ions can be coordinated by the phosphate groups of the DNA and induce the conformation changes of the DNA from B-DNA to A-DNA.
Molecular Orientation and Structural Characterization of Ultrathin Films of C
12
AzoNaph(1,4)C
6
N-SDS Studied by FT-IR and NIR-SERS Spectroscopies
XU Wei-qing, WU Yu-qing, ZHAO Bing, LI Guo-wen, LI Bo-fu, Yukihiro Ozaki
2002, 18(4): 433-437.
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The orientation and structural characterization of the ultrathin film of azobenzene-containing amphiphilic compound, C
12
AzoNaph(1,4)C
6
N
+
Br
-
, were studied in the present study. The compound can form a stable monolayer with sodium dextrin sulfate(SDS) by means of electrostatic interaction. Fourier-transform infrared(FT-IR) and near-infrared surface-enhanced Raman scattering(NIR-SERS) spectroscopies were used to study the orientation and characterize the structure of the Langmuir-Blodgett(LB) film and the dipping film. The FT-IR spectra indicate that the alkyl tail is nearly perpendicular to the substrate surface without any aggregation and adopts largely trans-zigzag conformation in the LB film. The NIR-SERS spectra demonstrate that the chromorphoric part in C
12
AzoNaph(1,4)C
6
N
+
Br is also nearly perpendicular to the surface of silver substrate both in the dipping film and the LB film. A new "sandwiched system" model was designed to investigate the orientation and structural characterization of the chromophoric part in the multi-monolayer LB films on the non-SERS active substrate. The SERS mechanism of the "sandwiched system" is discussed in the present paper.
Preparation of Microcapsules by Drying-in-liquid with a [(O
Ⅰ
/W
Ⅰ
)/O
Ⅱ
]/W
Ⅱ
Multi-emulsion
ZHANG Rong-chang
2002, 18(4): 438-440.
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The microencapsulation of the extractant was studied by drying-in-liquid with a [(O
Ⅰ
/W
Ⅰ
)/O
Ⅱ
]/W
Ⅱ
multi-emulsion. The microcapsules were characterized by the release efficiency of the extractants to discuss the effect of Tween 60, gelatin, and EC on the experimental results. The size dispersity of microcapsules with the different concentrations of gelatin was also discussed. The results show that microcapsules with good membrane tension for several extractants can be obtained with this method.
Effect of Frontier Orbital on Aggregation Behavior of Barbituric Acid Derivatives
LIU Chun-ming, YANG Wen-sheng
2002, 18(4): 441-444.
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Two amphiphilic barbituric acid derivatives with a D-π-A structure, 5-(4-dodecyloxybenzylidene)-(1H,3H)-2,4,6-pyrimidinetrione(PB
12
) and 5-(4-N,N-didodecylaminobenzylidene)-(1H,3H)-2,4,6-pyrimidintrione(AB
12
) were found to show different aggregation behavior in chloroform. PB
12
, a derivative with weak electron donating and strong electron drawing substituents, tends to aggregate in a head-to-tail manner, whereas AB
12
, a derivative with both strong electron donating and drawing substituents, tends to aggregate in a face-to-face manner at a higher concentration. The cyclic voltammograms of AB
12
and PB
12
show that their energy levels of LUMO approach each other, however, the energy level of HOMO of AB
12
is much higher than that of PB
12
.
ESR Characterization and Activity of V
2
O
5
/γ-Al
2
O
3
Catalysts for Dehydrogenation of Isobutane
WANG Guo-jia, MA Hong-chao, LI Ying
2002, 18(4): 445-447.
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The ESR spectra of catalyst V
2
O
5
/γ-Al
2
O
3
and its activity for the dehydrogenation of isobutane were investigated. On the basis of the results of the ESR spectroscopy associated with the TPR results, it is suggested that there is a strong interaction between V
2
O
5
and γ-Al
2
O
3
and the V
4+
species on the surface is the active center of catalyst V
2
O
5
/γ-Al
2
O
3
for this reaction.
Effect of Activated Carbon as a Support on Metal Dispersion and Activity of Ruthenium Catalyst for Ammonia Synthesis
ZHENG Xiao-ling, ZHANG Shu-juan, LIN Jian-xin, XU Jiao-xing, FU Wu-jun, WEI Ke-mei
2002, 18(4): 448-452.
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Ten kinds of activated carbon from different raw materials were used as supports to prepare ruthenium catalysts. N
2
physisorption and CO chemisorption were carried out to investigate the pore size distribution and the ruthenium dispersion of the catalysts. It was found that the Ru dispersion of the catalyst was closely related to not only the texture of carbon support but also the purity of activated carbon. The activities of a series of the carbon-supported barium-promoted Ru catalysts for ammonia synthesis were measured at 425 ℃, 10.0 MPa and 10 000 h
-1
. The result shows that the same raw material activated carbon, with a high purity, high surface area, large pore volume and reasonable pore size distribution might disperse ruthenium and promoter sufficiently, which activated carbon as support, could be used to manufacture ruthenium catalyst with a high activity for ammonia synthesis. The different raw material activated carbon as the support would greatly influence the catalytic properties of the ruthenium catalyst for ammonia synthesis. For example, with coconut shell carbon(AC1) as the support, the ammonia concentration in the effluent was 13.17% over 4%Ru-BaO/AC1 catalyst, while with the desulfurized coal carbon(AC10) as the support, that in the effluent was only 1.37% over 4%Ru-BaO/AC10 catalyst.
Radial Basis Function Networks Applied in Bacterial Classification Based on MALDI-TOF-MS
ZHANG Zhuo-yong, WANG Dan, LIU Si-dong, HARRINGTON Peter de B., VOORHEES Kent J., REES Jon
2002, 18(4): 453-457.
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The radial basis function networks were applied to bacterial classification based on the matrix-assisted laser desorption/ionization time-of-flight mass spectrometric (MALDI-TOF-MS) data. The classification of bacteria cultured at different time was discussed and the effect of the network parameters on the classification was investigated. The cross-validation method was used to test the trained networks. The correctness of the classification of different bacteria investigated changes in a wide range from 61.5% to 92.8%. Owing to the complexity of biological effects in bacterial growth, the more rigid control of bacterial culture conditions seems to be a critical factor for improving the rate of correctness for bacterial classification.
Characterization of Fe
3
O
4
/P(St-MPEO) Amphiphilic Magnetic Polymer Microspheres
LIU Xue-yong, DING Xiao-bin, ZHENG Zhao-hui, ZHANG Wen-chan, PENG Yu-xing, CHAN ALBERT S. C., YIP C. W., LONG Xin-ping
2002, 18(4): 458-461.
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)
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Amphiphilic magnetic microspheres consisting of styrene and poly(ethylene oxide) macromonomer(MPEO) were prepared by dispersion copolymerization in the presence of Fe
3
O
4
magnetic fluid in an ethanol/water medium. The sizes of the magnetic microspheres and their distribution were characterized by means of scanning electron microscopy(SEM). The surface morphology and the average surface roughness of the microspheres were investigated by virtue of atomic force microscopy(AFM). It was found that the microspheres exhibit microscopic phase-separate and the mean square surface roughness of the microspheres increases with increasing MPEO used in the copolymerization. The amphiphilic magnetic microspheres containing 0.4-3.5 mg/g hydroxyl groups could be prepared from MPEO with different concentrations and styrene.
Polymerization of Norbornene via an Iron-Based Complex/MAO Catalytic System
MI Xia, MA Zhi, YAN Wei-dong, LIU Yuan-xia, WANG Hang, KE Yu-cai, HU You-liang
2002, 18(4): 462-465.
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Polynorbornenes were synthesized in the presence of an iron based catalyst, 2,6-bis[1-(2,6-diisopropyl-phenylimino)ethyl]pyridine iron(Ⅱ) dichloride. The FTIR,
1
H NMR and
13
C NMR analysis results revealed that the structure of the obtained polynorbornenes consisted of vinyl addition polymer substructures without any ring-opening structures. The polymers were amorphous with a short-range order, displayed in the WAXD(wide angle X-ray diffraction) diagrams. The glass transition temperatures ranged from 200 to 400 ℃. The effects of the polymerization reaction conditions, such as Al/Fe molar ratio and toluene/CH
2
Cl
2
volume ratio, on the activity, intrinsic viscosity [η] and T
g
were also studied.
Letters
A Novel Ternary Complex of Europium(Ⅲ) for Eletroluminescent Device
BIAN Zu-qiang, GAO De-qing, SUN Chang-yan, WANG Ke-zhi, JIN Lin-pei, HUANG Chun-hui
2002, 18(4): 466-468.
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)
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A Novel Salicylic Acid Group-containing Ru(Ⅱ) Complex for Sensitizing Nanocrystalline TiO
2
Solar Cell
DONG Bin, YAO Qiao-hong, WANG Ke-zhi, JIN Lin-pei, HUANG Chun-hui
2002, 18(4): 469-470.
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)
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A Novel Layer Structure of a Capric Acid and 1,2-Bis(4-pyridyl)-ethylene Complex with Reverse Alkyl Chains Interdigitattion
WU Ying, ZHANG Jing, HOU Xue-liang, YE Ling, YANG Guang-di, WU Li-xin
2002, 18(4): 471-473.
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)
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The Synthesis and Structural Characterization of Two-dimensional Coordination Polymer {[Ni(phen)H
2
O](μ
4
-C
10
H
2
O
8
)
1/2
}
n
YE Ling, PAN Cheng-ling, CHU De-qing, WANG Li-min, MU Zhong-cheng, XU Ji-qing
2002, 18(4): 474-477.
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Research Notes
Growth of GeO
2
Crystallite Thin Film on Si Substrate by Langmuir-Blodgett Technique
JIN Jian, GUO Yi, CHEN Xia, LI Ye-zhi, YANG Wen-sheng, LI Tie-jin
2002, 18(4): 478-480.
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)
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Reviews
The Development of Modern Pesticides
Harry R. Hudson, WU Jun, XU Wei-liang
2002, 18(4): 481-490.
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The present paper deals with agrochemicals. The low toxicities to mammals and wild lives, greater selectivity against target organisms, and high levels of activity are particular features of many modern agrochemicals. It is suggested that integrated pest management(IPM), by means of a combination of biological and chemical controls has met with some success and the present approach is to optimize the use of chemicals rather than to eliminate them.
Bioinformatics Assisted Gene Discovery and Annotation of Human Genome
WANG Wei, WANG Yu-hong, Li Wei
2002, 18(4): 491-494.
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As the sequencing stage of human genome project is near the end, the work has begun for discovering novel genes from genome sequences and annotating their biological functions. Here are reviewed current major bioinformatics tools and technologies available for large scale gene discovery and annotation from human genome sequences. Some ideas about possible future development are also provided.
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