排序方式: 共有74条查询结果,搜索用时 15 毫秒
41.
Meral Gormen Pascal Pigeon Marie-Aude Plamont Anne Vessières 《Tetrahedron letters》2010,51(1):118-9390
Recent results suggest that [3]ferrocenophane may be an interesting motif in the development of cytotoxic anti-cancer agents. We here report the synthesis of three such compounds based on the 1-[(p-R-phenyl)-phenyl-methylidenyl)]-[3]ferrocenophane skeleton with R = OH, NH2 and NHC(O)CH3 substitution on one of the phenyl rings. Cytotoxicity studies show that these compounds are up to four times more powerful against hormone-independent breast cancer cells than their corresponding ferrocene analogs. 相似文献
42.
Meral Eral 《光谱学快报》2013,46(4):431-440
The feasibility of determining uranium in natural waters for uranium exploration using dibenzoil methane (DBM) by the adsorption of U(VI) on ferric hydroxide, was investigated. The yields of coprecipitation were determined by a Scintrex UA-3 laser fluorimetric uranium analyser using standard uranium solutions. After dissolving the coprecipitate, uranium was selectively separated by carbonate precipitation and determined with DBM. Fe(OH)3 - DBM method was controlled using both standard solutions and uranium analyser measurements of some natural water samples taken from Northern Ege Region where detailed radiometric investigation has been going on. The advantage of this method 相似文献
43.
Nurcan Karaca Gokhan Temel Demet Karaca Balta Meral Aydin Nergis Arsu 《Journal of photochemistry and photobiology. A, Chemistry》2010,209(1):1-6
Hydrogels were prepared by photoinduced polymerization of poly(ethylene glycol)monoacrylate (PEGMA) and poly(ethylene glycol)diacrylate (n = 200 and 700) (PEGDA) with Type I, 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl-1-propane-1-one (I-2959) and one-component Type II initiators: (9-oxo-9H-thioxanthen-2-yloxy)-acetic acid (TXOCH2COOH) and (9-oxo-9H-thioxanthen-2-yloxy)-sodium acetate (TXOCH2COO?Na+). The swelling properties of hydrogels were investigated and observed to be excellent. Smooth morphology and no phase separation were observed from SEM micrographs of the hydrogels. 相似文献
44.
M. A. A. Al-Janabi Siyamanto K. Khachadoorian E. H. Abbas A. H. M. Kadem 《Journal of Radioanalytical and Nuclear Chemistry》1990,141(1):61-67
The extraction of cerium from uranium fission products using different concentrations of di(2-ethylhexyl)-phosphoric acid (DEHPA) and varying concentrations of nitric acid solutions was studied. Cerium was quantitatively stripped from the organic phase with 6N HNO3 after washing with 0.01N HCl. The gamma-ray spectra were obtained with a Ge(Li) detector and recorded in a 4096-channel pulse-height analyzer. 相似文献
45.
46.
Invasion is a key property of tumour cells for building metastasis. A class of functionally related proteins called heat shock proteins (HSPs), the expression of which is increased when cells are exposed to elevated temperatures or other stress, play an important role in the invasion. In this paper we develop a mathematical model focusing on the effect of HSPs on the tumour cell migration. The resulting multiscale setting accounts both for the microscopic, intracellular level on which these proteins are acting and for the macroscopic level of the cell population. We prove the local existence of a unique positive solution and perform numerical simulations in order to illustrate the behaviour of cancer cells w.r.t. the fibre density of the tissue and the matrix degrading enzymes, along with the effect of HSPs. 相似文献
47.
In linear regression analysis, outliers often have large influence in the model/variable selection process. The aim of this study is to select the subsets of independent variables which explain dependent variables in the presence of multicollinearity, outliers and possible departures from the normality assumption of the error distribution in robust regression analysis. In this study to overcome this combined problem of multicollinearity and outliers, we suggest to use robust selection criterion with Liu and Liu-type M(LM) estimators. 相似文献
48.
49.
A normal surface singularity is rational if and only if the dual
intersection graph of a desingularization satisfies some combinatorial
properties.
In fact, the graphs defined in this way are trees. In this paper
we give geometric features of these trees.
In particular, we prove that the number
of vertices of valency 3
in the dual intersection tree of the minimal desingularization of a
rational singularity of multiplicity
m 3 is at most
m - 2. 相似文献
50.
Engin Kendi Süheyla Özbey Meral Tunçbilek Rahmiye Ertan Hoong-Kun Fun Boon-Chuan Yip 《Journal of chemical crystallography》1994,24(11):747-751
The crystal and molecular structure of the title compound has been determined by direct methods, and refined to a finalR of 0.070 for 1466 observed reflections. The compound crystallizes in space group P2l/n with cell dimensionsa=10.706(8),b=21.127(11),c=12.038(10) Å, Z=4.1,4-dihydropyridine ring adopts a boat shaped conformation. The flavon molecule is planar and it's phenyl ring is almost perpendicular to the 1,4-DHP. The C36 atom of the allyl group shows disorder. 相似文献