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排序方式: 共有998条查询结果,搜索用时 31 毫秒
901.
902.
Dr. Pierre Queval Dr. Claire Jahier Dr. Mathieu Rouen Isabelle Artur Dr. Jean‐Christophe Legeay Laura Falivene Loic Toupet Dr. Christophe Crévisy Prof. Luigi Cavallo Dr. Olivier Baslé Dr. Marc Mauduit 《Angewandte Chemie (International ed. in English)》2013,52(52):14103-14107
A low‐cost, modular, and easily scalable multicomponent procedure affording access in good yields and excellent selectivity (up to 93 %) to a wide range of (a)chiral unsymmetrical 1‐aryl‐3‐cycloalkyl‐imidazolium salts is disclosed. Electronic and steric properties of the corresponding unsymmetrical unsaturated N‐heterocyclic carbene (U2‐NHC) ligands were evaluated and evidenced strong electron donor ability, high steric discrimination, and modular steric demand. 相似文献
903.
904.
905.
Artur Glogau 《Monatshefte für Chemie / Chemical Monthly》1904,25(4):391-396
Ohne ZusammenfassungDie hier mitgeteilten Versuche wurden teils im I. chemischen Universitätslaboratorium in Wien, teils im chemischen Laboratorium der deutschen Universität in Prag ausgeführt. 相似文献
906.
907.
Artur Erdélyi 《Mathematische Zeitschrift》1936,40(1):693-702
Ohne Zusammenfassung 相似文献
908.
Domingo Huerta-Vilca Sandra Regina de Moraes Artur de Jesus Motheo 《Journal of Solid State Electrochemistry》2005,9(6):416-420
Electrodeposition of polyaniline (PAni) from acid solutions on spontaneous passivating electrodes such as Al is not so obvious as on active metals (Fe and Ni). The methods that can result in deposition are: (1) surface pre-treatment with a chelating agent (alizarin) to block the hydrogen evolution reaction on aluminium and (2) a suitable monomer concentration (critical monomer concentration) to decrease the polymerisation induction time. The oxidation of aluminium to thick porous film limits the growth kinetics of PAni during deposition by cyclic voltammetry. We found that after reducing hydrogen evolution by surface chelation, for film growing in 0.5 M H2SO4 a concentration of 0.4 M aniline is required. 相似文献
909.
Anna Brzechwa-Chodzyska Mateusz Godyn Anna Walczak Jack M. Harrowfield Artur R. Stefankiewicz 《Molecules (Basel, Switzerland)》2021,26(18)
An Ag(I) metallacycle obtained unexpectedly during the preparation of Pd(II) complexes of the bifunctional ligand 5-([2,2′-bipyridin]-5-yl)pyrimidine-2-amine (L) has been characterized using X-ray structure determination as a binuclear, metallacyclic species [Ag2L2](SbF6)2, where both the bipyridine and pyrimidine-N donors of L are involved in coordination to the metal. The full coordination environment of the Ag(I) defines a case of highly irregular 4-coordination. In the crystal, the Ag-metallacycles assemble into one-dimensional supramolecular metalladynamers linked together by hydrogen-bonding interactions. 相似文献
910.
Studies of Benzothiazole and Benzoselenazole Squaraines as Fluorescent Probes for Albumins Detection
Volkova KD Kovalska VB Losytskyy MY Bento A Reis LV Santos PF Almeida P Yarmoluk SM 《Journal of fluorescence》2008,18(5):877-882
Series of squaraine benzothiazole and benzoselenazole dyes were studied as possible fluorescent probes for the detection of
proteins, particularly albumins. It was shown that majority of the studied squaraines give significant fluorescent response
on the human serum albumin (HSA) and bovine serum albumin presence. For squaraine dyes with N-hexyl pendent groups (P-1, P-2, P-3, P-5) about 100−540-fold fluorescence intensity increase upon albumins addition was observed.
At the same time in presence of other proteins, namely insulin, avidin from hen egg white, immunoglobulin G (IgG), carbonic
anhydrase fluorescence enhancement values were considerably lower —up to 43 times in IgG presence. It was noted that generally,
squaraines with long N-hexyl pendent groups demonstrate higher emission increase values upon proteins addition comparing with their analogues with
short N-ethyl tails. It was shown that fluorescence intensity enhancement for benzothiazole squaraine dye P-3, relates linearly to
the HSA concentration over the wide range—from 0.2 to 500 μg/ml. Together with noticeable selectivity of this dye to albumins,
existence of wide dynamic range gives possibility to propose P-3 dye as probe for HSA quantification. 相似文献