排序方式: 共有8条查询结果,搜索用时 31 毫秒
1
1.
Epimerization of d-glucose and d-mannose, catalyzed by the water soluble complexes of Cu(II), Ni(II), Co(II) and Cd(II) with bisnitrogen ligands 4–7, and by Mo(VI) complexes prepared in situ from ammonium heptamolybdate (AHM) with ligands 4–9 is compared. All examined complexes exhibit lower catalytic activity than AHM: strong coordination of the ligands by both (N,O) heteroatoms to metal ions, presumably affords catalytically less active species. Some free ligands and their metal (II) complexes catalyze both C(2) epimerization and isomerization of aldoses to d-fructose. 相似文献
2.
By this article we conclude the construction of all primitive ( v, k,λ ) symmetric designs with v < 2500 , up to a few unsolved cases. Complementary to the designs with prime power number of points published previously, here we give 55 primitive symmetric designs with v ≠ p m , p prime and m positive integer, together with the analysis of their full automorphism groups. The research involves programming and wide‐range computations. We make use of the software package GAP and the library of primitive groups which it contains. © 2011 Wiley Periodicals, Inc. J Combin Designs 19:463‐474, 2011 相似文献
3.
Majstorović Snježana Sabo Kristian Jung Johannes Klarić Matija 《Central European Journal of Operations Research》2018,26(3):715-737
Central European Journal of Operations Research - The growth curve clustering problem is analyzed and its connection with the spectral relaxation method is described. For a given set of growth... 相似文献
4.
The focus of this paper is the regional GDP analysis of Croatian Counties. It is a part of an extensive on-going scientific
research about Croatian economic challenges within the global recession environment. Although, as EU accession country, Croatia
is divided into three NUTS 2 regions, twenty one Croatian Counties show significant economic and social disproportions. In
multiple regression model it is researched to what extent regional GDP per capita depends on a set of regional variables (employment,
gross investment, production of more important agricultural products, GVA per person employed, construction works value, exports,
imports, foreign tourists arrivals, foreign tourist nights, ecology...). Subsequently parameters are evaluated by Monte Carlo
simulations which are used for the first time in comparative regional analysis. Also Croatian Counties are classified using
Cluster analysis to make a comparative analysis with official spacing into three NUTS 2 regions which are geographical and
political areas rather than real and homogenous socio-economic areas. 相似文献
5.
6.
In this paper we either prove the non‐existence or give explicit construction of primitive symmetric (v, k, λ) designs with v=pm<2500, p prime and m>1. The method of design construction is based on an automorphism group action; non‐existence results additionally include the theory of difference sets, multiplier theorems in particular. The research involves programming and wide‐range computations. We make use of software package GAP and the library of primitive groups which it contains. © 2009 Wiley Periodicals, Inc. J Combin Designs 18: 141–154, 2010 相似文献
7.
ESI‐MS studies of the non‐covalent interactions between biologically important metal ions and N‐sulfonylcytosine derivatives
下载免费PDF全文
![点击此处可从《Journal of mass spectrometry : JMS》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Valentina Ključarić Renata Kobetić Jasmina Rinkovec Snježana Kazazić Dubravka Gembarovski Dijana Saftić Josipa Matić Željka Ban Biserka Žinić 《Journal of mass spectrometry : JMS》2016,51(11):998-1005
The aim of this report is to present the electrospray ionization mass spectrometry results of the non‐covalent interaction of two biologically active ligands, N‐1 ‐ (p‐toluenesulfonyl)cytosine, 1‐TsC, 1 and N‐1 ‐ methanesulfonylcytosine, 1‐MsC, 2 and their Cu(II) complexes Cu(1‐TsC‐N3)2Cl2, 3 and Cu(1‐MsC‐N3)2Cl2 and 4 with biologically important cations: Na+, K+, Ca2+, Mg2+ and Zn2+. The formation of various complex metal ions was observed. The alkali metals Na+ and K+ formed clusters because of electrostatic interactions. Ca2+ and Mg2+ salts produced the tris ligand and mixed ligand complexes. The interaction of Zn2+ with 1–4 produced monometal and dimetal Zn2+ complexes as a result of the affinity of Zn2+ ions toward both O and N atoms. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
8.
Homogeneous hydrogenation of two epimeric aldoses, d-glucose (d-Glc) and d-mannose (d-Man) was performed in water, with molecular hydrogen and by transfer hydrogenation catalyzed by [Ru-TPPTS] complex (TPPTS = trisodium salt of tri(m-sulfophenyl)phosphine). Both method proved effective, and revealed d-Man as more reactive aldose. Hydrogen transfer has been studied with various hydrogen donors: the most effective, but highly pH-dependent system has been found in Et3N/formic acid (azeotropic mixture 2:5) as the source of hydrogen. 相似文献
1