共查询到20条相似文献,搜索用时 31 毫秒
1.
Based on the mechanism of H2O2-mediated hydrolysis of sulfonates, two fluorescein disulfonates compounds (FS-1 and FS-2) were designed and synthesized as
the highly selective and sensitive fluorescent probes for imaging H2O2 in living cells. The probes were detected with elemental analysis, IR, 1H NMR and 13C NMR. Upon reaction with H2O2, the probes exhibit strong fluorescence responses and high selectivity for H2O2 over other reactive oxygen species and some biological compounds. Furthermore, the sulfonate-based probes, as novel fluorescent
reagents, are cell-permeable and can detect micromolar changes in H2O2 concentrations in living cells by using confocal microscopy.
Supported by the National Basic Research Program of China (Grant No. 2007CB936000), the National Natural Science Funds for
Distinguished Young Scholar (Grant No. 20725518), Major Program of the National Natural Science Foundation of China (Grant
No. 90713019), the National Natural Science Foundation of China (Grant No. 20875057), the Natural Science Foundation of Shandong
Province, China (Grant No. Y2007B02), and the Science and Technology Development Programs of Shandong Province, China (Grant
No. 2008GG30003012) 相似文献
2.
We have studied the ground and excited states of the three dendritic polynuclear Pt(II) complexes 1-[Cl(PH3)2PtC≡≡ C]-3,5-[HC≡≡ C]C6H3 (1), 1,3-[Cl(PH3)2PtC≡≡ C]2-5-[HC≡≡ C]C6H3 (2), and 1,3,5-[Cl(PH3)2- PtC≡≡ C]3C6H3 (3), by using the B3LYP and UB3LYP methods, respectively. TDDFT approach with the PCM model was performed to predict the emission spectra properties of 1―3 in CH2Cl2 solution. We first predicted the excited-state geometries for the three complexes. With the change of the number of Pt(II) atom, 1―3 show the different geometry structures in both the ground and excited states; fur- thermore, the increase of the metal density from 1 to 3 results in the red shift of the lowest-energy emissions along the series. The luminescent properties of 1 are somewhat different from those of 2 and 3. The emission properties of 2 and 3 are richer than 1. Our conclusion can give a good support for designing the high efficient luminescent materials. 相似文献
3.
Six series of meso-tetrakis (4-n-alkanoyloxyphenyl) porphyrin Co and Ni complexes (12 kinds) were reported. Nine of the compounds were found to exhibit liquid
crystal properties and display a hexagonal columnar discotic columnar (Colh) phase. Molecular structure of all synthesized compounds was confirmed by IR, UV, MS, 1H NIVR, and elemental analysis. These liquid crystalline compounds have been studied by cyclic voltammetry, luminescence,
and surface photovoltage spectroscopy.
Supported by the National Natural Science Foundation of China (Grant No. 59783001), the Natural Science Foundation of Shandong
Province (Grant No. Y2006B41), the Foundation of Shandong Provincial Education Department (Grant No. J06A53), the Natural
Science Foundation of Shandong University of Technology (Grant No. 2004KJM15) and Doctor Foundation of Shandong University
of Technology 相似文献
4.
LanYong Zhang Ying Wan Jiong Zhang Di Li LiHua Wang ShiPing Song ChunHai Fan 《中国科学B辑(英文版)》2009,52(6):746-750
A highly sensitive method for the detection of a breast cancer-associated BRCA-1 gene is reported. The detection is based
on a classical sandwich-type assay using horseradish peroxidase (HRP) as a catalytic label and electrodeposited Os2+/3+ conducting polymer (PAA-PVI-Os) as a redox mediator. Target DNA could be detected by the HRP-catalyzed reduction of H2O2, leading to a limit of detection as low as 10 fM.
Supported by the National Natural Science Foundation of China (Grant Nos. 20725516, 20704043, 20873175 & 20805055), Shanghai
Municipal Commission for Science and Technology (Grant Nos. 0752nm021 & 07ZR14136), Ministry of Science and Technology (Grant
Nos. 2006CB933000, 2007CB936000 & 2007AA06A406), Ministry of Health (Grant No. 2009ZX10603), and China Postdoctoral Science
Foundation and Shanghai Postdoctoral Scientific Program (Grant No. 07R214160). 相似文献
5.
BaoZi Peng ChangYu Sun GuangJin Chen LanYing Yang Wei Zhou WeiXin Pang 《中国科学B辑(英文版)》2009,52(5):676-682
Greenhouse gas CO2 has become a serious problem for human beings. The hydrate technology has been considered as a possible approach to sequester
CO2. In this work, the lateral growth rates of a CO2 hydrate film in aqueous NaCl solutions of different concentrations were measured by means of suspending a single gas bubble
in liquid. The results show that the film growth rates depended on not only the driving force, but also the NaCl concentration,
and the film growth rates decreased with the increasing NaCl concentration. The simple relationship vf∝ΔT
5/2 could be used to correlate the hydrate film growth rate of a CO2 + NaCl + water system by introducing a NaCl concentration-dependent coefficient. The film thickness was investigated experimentally
and evaluated theoretically; the results show that it became thicker at a higher NaCl concentration when the temperature and
pressure were specified. In addition, a series of interesting phenomena, such as the occurrence of double hydrate films, were
displayed and discussed.
Supported by the National Natural Science Foundation of China (Grant Nos. 20676145 & U0633003) and the Program for New Century
Excellent Talents in University (Grant No. NCET-07-0842) 相似文献
6.
Hualiang Jiang Weiliang Zhu Xiaojian Tan Jiande Gu Jianzhong Chen Maowei Lin Kaixian Chen Ruyun Ji 《中国科学B辑(英文版)》1998,41(5):535-542
Density-functional theory (DFT) approach of B3LYP/6-31G* has been employed to calculate the six possible configurations of
ammonium cation-benzene complex (NH4
+ -C6H6). The calculation result released that the asymmetrical configuration of this complex with two hydrogen atoms pointing to
the benzene ring was the most stable structure. Structural characteristics, molecular interaction fashion and thermodynamic
parameters indicated that NH4
+ was bound to benzene through hydrogen bonding interaction.
Project supported by the “863” High Technology Program of China (Grant No. 863-103-04-01) and the National Natural Science
Foundation of China (Grant No. 29403027) 相似文献
7.
LiXi Zeng YuJian He ZhiFeng Dai Jian Wang CaiQi Wang YongGang Yang 《中国科学B辑(英文版)》2009,52(8):1227-1234
Supramolecular chirality and molecular self-assembly are important and interesting phenomena in living and non-living systems.In this work,supramolecular chirality of achiral pseudoisocyanine(PIC) J-aggregates was successfully induced by D-,L-phenylalanine(Phe) and other amino acids in NaCl solution.The chiral J-aggregates showed a characteristic,induced circular dichroism(ICD) in the visible region of J-band chromophore which depends on the absolute configuration,concentration and side groups of α-amino ac... 相似文献
8.
Multi-walled carbon nanotubes based catalyst plasmon resonance light scattering analysis of tetracycline hydrochloride 总被引:2,自引:2,他引:0
It was found that multi-walled carbon nanotubes (MWNTs) could catalyze the redox reaction between chlorauric acid (HAuCl4) and reductive drugs such as tetracycline hydrochloride (TC), producing gold nanoparticles (Au NPs). By measuring the plasmon resonance light scattering (PRLS) signals of the resulting Au NPs, tetracycline hydrochloride can be detected simply and rapidly with a linear range of 4―26 μmol/L, a correlated coefficient (r ) of 0.9955, and a limit of detection (3σ) of 6.0 nmol/L. This method has been successfully applied to the detection of tetracycline hydrochloride tablets in clinic with the recovery of 101.9% and that of fresh urine samples with the recovery of 98.3%―102.0%. 相似文献
9.
A novel and green method for the synthesis of dimethyl pyridine-3,5-dicarboxylate has been developed. It is PdCl2-catalyzed heterocyclotrimerization of methyl acrylate with urea in methanol/supercritical carbon dioxide. The target compound
was obtained with a 75% isolated yield under the optimized conditions.
Supported by the National Natural Science Foundation of China (Grant Nos. 20332030, 20572027, 20625205 and 20772034) and Guangdong
Natural Science Foundation (Grant No. 07118070) 相似文献
10.
XueQin Chang Shun Wang DaJie Lin WeiPeng Guan Huan Zhou ShaoMing Huang 《中国科学B辑(英文版)》2009,52(3):318-324
An indium tin oxide (ITO) electrode modified with monolayer clay/[Ru(phen)2(dC18bpy)]2+ (phen=1,10-phenanthroline, dC18bpy = 4,4′-dioctadecyl-2,2′ bipyridyl) hybrid film has been fabricated by the Langmuir-Blodgett
(LB) method. Atomic force microscopy revealed that the single-layered hybrid film of clay/[Ru(phen)2(dC18bpy)]2+ (denoted as Clay-Ru) was closely packed at a surface pressure of 25 mN·m−1 and had a thickness of 3.4±0.5 nm. Cyclic voltammograms showed that the redox current of Ru(II) complex decreased when incorporated
into the clay film, suggesting that the clay layer acts as a barrier against electron transfer. When applied to oxidizing
the mononucleotide of guanosine 5′-monophosphate (GMP), a large catalytic oxidative current was achieved on the Clay-Ru(II)
modified ITO electrode at the external potential above 900 mV (vs. Ag|AgCl|KCl) and, more significantly, this response was
further enhanced by light irradiation (λ>360 nm), in which the photocurrent is increased about 11 times in comparison with
that of a bare ITO. Mechanism of the photoelectrocatalytic effect was proposed in terms of the reduction of the photoelectrochemically
generated Ru(III) complex in the Clay-Ru film by GMP.
Supported by the National Natural Science Foundation of China (Grant Nos. 20471043 and 20843007), Zhejiang Provincial Natural
Science Foundation (Grant Nos. Y404118 and Y408177), the “151” Distinguished Person Foundation of Zheji-ang Province of China,
Zhejiang Technology Project Foundation (Grant No. 2007C21134) and Wenzhou Technology Project Foundation (Grant No. N2004B040) 相似文献
11.
An indirect two-stage method for the electrosynthesis of NH2Cl was elaborated. In the first stage, NH4Cl was electrolyzed in a nondivided cell in the NaCl (aqueous solution)—CCl4 heterophase system to give NCl3 as a solution in CCl4. Under the optimum conditions, the yield of NCl3 was 80%, and the current efficiency 60%. In the second stage, the obtained solution reacted with an aqueous solution of NH3 to give an aqueous solution of NH2Cl in 50% yield (converted to NH3).
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2011–2014, October, 1998. 相似文献
12.
Rapidprogressinthetheoryofquantumreactivescatteringhasbeenmadeinthepastfewyears.Asaresultoftheprogressonecannowcalculateexactstate_tostatereactioncrosssectionsforafewfundamentalreactions.Amongvariousformulationsofthetheoreticalapproach,theSmatrixKohnv… 相似文献
13.
MEIER Herbert 《中国科学B辑(英文版)》2009,52(7):1051-1056
A rapid and efficient synthesis of novel dendrimer homotriptycenes is presented. The dendronized 9,10-dihydroanthracen-9-ols 4, having high electron densities in the benzene rings of the Fréchet-type dendrons, exhibited in the presence of acid a quantitative transannular ring closure to the corresponding dendritic homotriptycenes. The electron-donating Fréchet-type dendrons enabled the intramolecular FC alkylation by a regioselective 1,7-elimination of H2O. 相似文献
14.
15.
Bienzymatic biosensor for the determination of glucose by flow injection chemiluminescence (CL) detection was proposed. Hybrids
of gold nanoparticles (GNPs) and chitosan were chosen as the immobilization matrix of glucose oxidase (GOD) and horseradish
peroxidase (HRP) to fabricate the biosensors with silane-pretreated glass microbeads. After the enzyme catalyzing oxidation
of glucose in GOD biosensor, the produced H2O2 flowed into HRP biosensor to react with luminol. The doped GNPs in chitosan were found to enhance the classical CL reaction
of luminol-H2O2-HRP. The CL enhancement was investigated in detail by CL and UV-visible spectrum. Under the optimized experimental conditions,
glucose could be determined in a linear range from 0.01 to 6.0 mmol/L with a detection limit of 5.0 μmol/L at 3σ. The accuracy
of the proposed method was examined by detecting the glucose level in four clinical serum samples from hospital. The proposed
method provides a new alternative to determine glucose.
Supported by the Natural Science Foundation of Shandong Province (Grant No. Q2007B03), the Doctoral Fund of Qingdao University
of Science and Technology (Grant No. 0022141), and the National Natural Science Foundation of China (Grant No. 20775038) 相似文献
16.
Preparation of polymer-supported hydrated ferric oxide based on Donnan membrane effect and its application for arsenic removal 总被引:2,自引:0,他引:2
QingJian Zhang BingCai Pan XinQing Chen WeiMing Zhang BingJun Pan QuanXing Zhang L. Lv X. S. Zhao 《中国科学B辑(英文版)》2008,51(4):379-385
In the present study a novel technique was proposed to prepare a polymer-supported hydrated ferric oxide (D201-HFO) based on Donnan membrane effect by using a strongly basic anion exchanger D201 as the host material and FeCl3-HCl-NaCl solution as the reaction environment. D201-HFO was found to exhibit higher capacity for arsenic removal than a commercial sorbent Purolite ArsenX. Furthermore, it presents favorable adsorption selectivity for arsenic removal from aqueous solution, as well as satis- factory kinetics. Fixed-bed column experiments showed that arsenic sorption on D201-HFO could re- sult in concentration of this toxic metalloid element below 10 μg/L, which was the new maximum con- centration limit set recently by the European Commission and imposed by the US EPA and China. Also, the spent D201-HFO is amenable to efficient regeneration by NaOH-NaCl solution. 相似文献
17.
A time-dependent quantum wave packet method was used to study the dynamics of dissociative adsorption of H2 and D2 on a flat and static surface. The molecule-surface interaction is described using a modified London-Eyring-Polanyi-Sato (LEPS)
type potential for the H2/Ni(100) system. The three-dimensional (3-D) dissociation probabilities were calculated for different initial rovibrational
states as a function of initial incident energies. Our results show that the dissociation of the diatomic rotational states
whose quantum numbers satisfyj+m = odd is forbidden at low energies for the homonuclear Hz and D2 due to the selection rule. The effect of the rotational orientation of diatoms on adsorption predicts that the in-plane rotation
(m = j) is more favorable for dissociation than the out-of-plane rotation (m = 0). Enhanced dissociation for vibrationally excited molecules and the significant enhancement of the dissociation probability
of H2 when compared to D2 were explained reasonably in terms of quantum mechanical zero-point energies, the tunneling effect and the reflection from
an activation barrier.
Project supported by the National Natural Science Foundation of China (Grant No. 19694033) and partially by the Science Foundation
for Overseas Chinese Scholars and Students, administered by the State Education Commission of China (Grant No. 1992), by the
State Key Laboratory of Theoretical and Computational Chemistry of Jilin University at Changchun (Grant No. 98011, and by
the Natural Science Foundation of Shandong Province (Grant No. Y96B03022) 相似文献
18.
Making use of the invariant property of the equilibrium size distribution of the hydrogen bonding clusters formed in hydrogen
bonding system of AaDd type, the analytical expressions of the free energy in pregel and postgel regimes are obtained. Then the gel free energy
and the scaling behavior of the number of hydrogen bonds in gel phase near the critical point are investigated to give the
corresponding scaling exponents and scaling law. Meanwhile, some properties of intermolecular and intramolecular hydrogen
bonds in the system, sol and gel phases are discussed. As a result, the explicit relationship between the number of intramolecular
hydrogen bonds and hydrogen bonding degree is obtained.
Supported by the National Natural Science Foundation of China (Grant Nos. 20303006 and 20574016), the Natural Science Foundation
of Hebei Province (Grant Nos. B2006000959 and B2004000093) and the Natural Science Foundation of Education Committee of Hebei
Province (Grant No. 2003101) 相似文献
19.
Nanogold particles of 10 nm were used to label goat anti-human IgG (GIgG) to obtain nanogold-labeled GIgG (AuGIgG). In a citrate-HCI
buffer solution of pH 2.27, AuGIgG showed a strong catalytic effect on the reaction between HAuCl4 and NH2OH to form big gold particles that exhibited a resonance scattering (RS) peak at 796 nm. Under the chosen conditions, AuGIgG
combined with IgG to form immunocomplex AuGIgG-IgG that can be removed by centrifuging at 16000 r/min. AuGIgG in the centrifuging
solution also showed catalytic effect on the reaction. On those grounds, an immunonanogold catalytic RS assay for IgG was
designed. With addition of IgG, the amount of AuGIgG in the centrifuging solution decreased; the RS intensity at 796 nm (I
796 nm) decreased linearly. The decreased intensity ΔI
796 nm was linear with respect to the IgG concentration in the range of 0.08–16.0 ng · mL−1 with a detection limit of 0.02 ng · mL−1. This assay was applied to analysis of IgG in sera with satisfactory sensitivity, selectivity and rapidity.
Supported by the National Natural Science Foundation of China (Grant No. 20667001), Natural Science Foundation of Guangxi
Province (Grant No. 0728213), and the Foundation of New Century Ten-Hundred-Thousand Talents of Guangxi Province 相似文献
20.
Removal of nitrate from groundwater by heterotrophic denitrification using the solid carbon source 总被引:6,自引:0,他引:6
Removal of nitrate from groundwater was investigated using biodegradable meal box(BMB) and poly(ε-caprolactone)(PCL) as carbon source and biofilm carrier.The experimental results show that nitrate in groundwater can be effectively removed using BMB and PCL as carbon source.Denitrification rates supported by BMB and PCL were 52.80 and 42.77 mg(NO3-N)/(m2h),respectively,at 30 ℃ and pH 7.5.The pH value of effluent ranged from 7 to 8,and NO2-N concentration was less than 0.1 mg/L.Compared with BMB,PCL could dec... 相似文献