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排序方式: 共有71条查询结果,搜索用时 46 毫秒
1.
Vassiliki Farmaki 《Transactions of the American Mathematical Society》1996,348(10):4023-4041
2.
Magafa Vassiliki Perlepes Spyros P. Stavropoulos George 《Transition Metal Chemistry》1997,23(1):105-107
It is becoming increasingly apparent that the coordination chemistry of oligopeptides with Cys-X-Y-Cys and His-X-Y-Cys sequences
(X, Y = variable amino acid residues) is an important theme in transition metal and bioinorganic chemistry(1,2). The Cys-X-Y-Cys
sequence is often encountered in the metal binding site of several metalloproteins, such as iron–sulfur proteins, e.g. rubredoxins(3)
and ferrodoxins(4), high potential iron–sulfur proteins(5), metallothioneins(6), zinc proteins(7) etc. The amino acid sequence
His-X-Y-Cys is also of bioinorganic importance since it has been found in the active site of copper(8), iron–sulfur(9) and
zinc(10) proteins. We are currently seeking to develop the area of transition metal/Cys-X-Y-Cys and His-X-Y-Cys peptide interactions(11,12);
our goals are: (i) to elucidate the role of these sequences in the biological activity and mechanism of action of the above
metallobiomolecules, and (ii) to find possible new and more effective agents for the elimination of heavy metals from the
human organism or from contaminated waste waters. Here we report the preparation and preliminary characterization of copper(II)
complexes of tetrapeptide ligands containing the Cys-X-Y-Cys and His-X-Y-Cys sequences.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
3.
Vassiliki I. Bebeki Anastasios N. Voulgaropoulos 《Fresenius' Journal of Analytical Chemistry》1992,342(4-5):352-356
Summary The spontaneous adsorption of the Co2+ complex with 1,10-phenanthroline on HMDE was utilized for the development of a voltammetric analytical method employing phase selective alternating current, with first harmonic AC1 in phase, =0°, voltammetry. The dependence of the analytical voltammetric response on physical and chemical parameters in various supporting electrolytes was investigated in detail. Optimum conditions for Co2+ determination were established. The method is very sensitive and selective. The determination limit is 205 ng/l Co2+ (adsorption time, tads=20 min). The precision and accuracy were evaluated: 1.84 g/l Co2+, RSD=3.24%, RE=–0.54%; for 205 ng/l Co2+, RSD=4.85%, RE=–3.90%. The results showed good reproducibility and reliabiality. The method was applied to natural waters, wines, mussel tissue and aquatic algae certified reference material. 相似文献
4.
Vassiliki Katsika-Tsigourakou 《Journal of Non》2012,358(22):2988-2989
The evolution of the aging process of glassy materials quenched from temperatures above their glass transition temperature Tg, when plotting the relaxed enthalpy versus the decrease in volume, leads to a slope comparable to the isothermal compressibility close to Tg. This empirical result was explained in an earlier publication (V. Katsika-Tsigourakou, G. E. Zardas J. Non-Cryst. Solids 356 (2010) 179–180) by means of a thermodynamical model. Here, we show that the same model enables the explanation of the rare cases of negative defect activation in solids. 相似文献
5.
6.
Ilias Papasarantos Persefoni Klimentzou Vassiliki Koutrafouri Maria Anagnostouli Christos Zikos Maria Paravatou-Petsotas Evangelia Livaniou 《Applied biochemistry and biotechnology》2010,162(1):221-232
A biotin derivative, namely biotin–aminocaproic acid–lysine (BAL), was synthesized with solid-phase chemistry, conjugated
to a carrier-protein, and used for rabbit immunization. The aminocaproic acid–lysine “long-arm” was used in order to project
the biotin-hapten above the carrier-protein surface. Lysine was selected due to its Nε-amino group, through which BAL was conjugated to the carrier-protein. BAL was synthesized on a commercially available resin
with the Fmoc-solid-phase strategy; this has simplified the experimental procedure, overcome the need for intermediate purification
steps, and led to a final product of high purity, with high yield. The anti-BAL antibodies recognized free biotin, as shown
with an in-house-developed ELISA, in which biotin conjugated to a synthetic “lysine–dendrimer” was used to coat the ELISA
microwells. In immunocytology and Western-blot experiments, the anti-BAL antibodies led to similar results with those obtained
with streptavidin. Synthetic derivatives of hapten molecules that can be easily prepared with solid-phase chemistry, such
as BAL, may be used for the development of specific antibodies for the corresponding hapten. 相似文献
7.
John K. Gallos Alexandros E. Koumbis Vassiliki P. Xiraphaki Constantinos C. Dellios Evdoxia Coutouli-Argyropoulou 《Tetrahedron》1999,55(52):6304-15180
The influence of the 2-substituent on the diastereoselectivity of the intramolecular cycloadditions in a series of 2-substituted-erythro-3,4-isopropylidene-dioxyhex-5-enenitrile oxides, generated in situ from selected sugar derivatives, was examined. 相似文献
8.
New Calix[4]arene‐Cored Peripherally Functionalized Dendrimers: Synthesis and Conformational Characteristics 下载免费PDF全文
Georgios Paraskevopoulos Dimitrios Alivertis Vassiliki Theodorou Konstantinos Skobridis 《Helvetica chimica acta》2015,98(5):593-603
New calixarene‐based dendrimers, containing calix[4]arene as the core and different generations of Fréchet‐type poly(benzyl ether) dendrons as building blocks, which possess either Br‐atoms or COOtBu groups at their surface were synthesized and presented herein for the first time. The new calix[4]arene‐cored dendritic macromolecules were fully characterized and found to prefer strictly the cone conformation. 相似文献
9.
Constantina P. Hadjiantoniou-Maroulis Vassiliki Ikonomou Evi Parisopoulou 《Journal of heterocyclic chemistry》1996,33(3):655-658
The synthesis and lead tetraacetate oxidation of the title mono- and bis-arylhydrazones to the corresponding 5-acyl-4-aryl(alkyl)-2-aryl-1,2,3-triazole 1-oxides is described. 相似文献
10.
John K. Gallos Vassiliki C. Sarli Zoe S. Massen Anastassia C. Varvogli Constantina Z. Papadoyanni Sofia D. Papaspyrou Nicolaos G. Argyropoulos 《Tetrahedron》2005,61(3):565-574
A new method for the synthesis of racemic non-proteinogenic α-amino acids has been developed, which involves (i) hetero-Diels-Alder addition of ethyl 2-nitrosoacrylate to electron rich alkenes such as enol ethers, enamines and allylsilanes, (ii) NaCNBH3 reduction of the CN bond in the oxazines thus generated, the stereochemistry of the products being controlled by epimerisation of the thermodynamically less stable isomer to the more stable one, (iii) protection of the N-H group as N-Boc and (iv) finally, N-O bond cleavage of both free and protected products to give proline or bis-homoserine derivatives, respectively. An example with concomitant reduction of the carboxylate group, resulting in the formation of the respective amino alcohol is reported. Applying this methodology to a homochiral enol ether, the protected parent d-proline was prepared in enantiomerically pure form, whereas the asymmetric synthesis of the respective bis-homoserine was unsuccessful. 相似文献