排序方式: 共有59条查询结果,搜索用时 257 毫秒
41.
Beril Anilanmert Ali Acar Ozdemir Muhammet Aydin Meral Akgül Salih Cengiz 《Chemical Papers》2015,69(12):1532-1540
Ethyl glucuronide (EtG) is a metabolite and a specific marker of alcohol consumption that can be detected days after the complete elimination of alcohol after drinking. A rapid, simple, and sensitive LC-ESI-MS/MS method for the determination of urinary ethyl glucuronide was developed and fully validated in accordance with analytical standards, using the C18 column. The whole process including sample preparation and LC-MS/MS lasted 10 min. A comprehensive validation including HorRat, measurement uncertainty, system suitability and intermediate precision calculations among analysts, and a cut-off limit study was performed. The method was applied to real samples and a cutoff limit determination study. The LOD and LOQ (using the IUPAC and Eurachem methods) were determined as 104.21 ng mL?1 and 165.00 ng mL?1. A cut-off limit of ≈ 818 ng mg?1 (normalised to creatinine) was found for urinary EtG. The results showed that the cut-off limits currently in use should be re-considered in further studies and standardised on a global scale. Normalisation to creatinine is important because of the risk of the dilution of urine intentionally or with a change of diet. The concentrations of real samples from subjects who had consumed alcohol were successfully predicted using this method, after zero HS-GC/MS results of urine alcohol concentration. 相似文献
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Hasan Tanak Karataş Şadiye Meral Seher Ağar Ayşen Alaman 《Crystallography Reports》2020,65(7):1221-1225
Crystallography Reports - A novel Schiff base compound was synthesized and characterized by IR spectroscopy and X-ray diffraction method. The compound crystallizes in monoclinic space group P21/c... 相似文献
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Hasan Tanak Karataş Şadiye Meral Seher Ağar Ayşen Alaman 《Crystallography Reports》2020,65(7):1212-1216
Crystallography Reports - N-(2-Fluorophenyl)-1-(5-nitrothiophen-2-yl)methanimine has been synthesized and characterized by single-crystal X-ray determination. Molecular geometry from X-ray... 相似文献
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McGovern MM Elles R Beretta I Somerville MJ Hoefler G Keinanen M Barton D Carson N Dequeker E Brdicka R Blazkova A Aymé S Schnieders B Muller CR Dalen V Martinez AA Kristoffersson U Ozguc M Mueller H Boone J Lubin IM Sequeiros J Taruscio D Williamson B Mainland L Yoshikura H Ronchi E 《Community genetics》2007,10(3):123-131
46.
Inactivation effect of an electric current treatment combining both 188 μA/m2 DC and 251 μA/m2 AC on Gram negative, Gram positive bacteria and their mixed culture, which were isolated from hides, was separately analyzed. This electric treatment, applied for 16 min was found to be fairly effective in reducing the bacterial cell count (7.10–7.48 log10 colony forming units/mL) to a relatively low level (4.52–4.90 log10 colony forming units/mL). At this level bacterial damage to the hides is reduced in soak liquors. Cheap and efficient electric current may be applied to rapidly reduce the destructive bacterial populations in main hide-soak liquors. 相似文献
47.
Meral Ya?ar 《Applied mathematics and computation》2012,218(10):6067-6071
In this paper, another proof of Pell identities is presented by using the determinant of tridiagonal matrix. It is calculated via the Laplace expansion. 相似文献
48.
Synthesis of ferrocenyl-substituted pyrazoles via the reaction between (2-formyl-1-chlorovinyl)ferrocene and hydrazine derivatives is described. Depending upon the substitution pattern of hydrazine, the reaction affords 1-alkyl/aryl-5-ferrocenylpyrazoles and/or 1-alkyl/aryl-3-ferrocenylpyrazoles. The reaction appears to be general for a variety of hydrazine derivatives. 相似文献
49.
This work focuses on the optimal control of a quantum system composed of harmonic oscillators under linear control agents
(dipole function, objective operator, and the penalty operator whose expectation value is to be suppressed). The main purpose
of the work is to determine the temporal external field amplitude function. Paper recalls the formulation of the optimal control
equations first. Then a set of ordinary differential equations over the expectation values of certain unknown entities is
constructed. These temporal differential equations have time varying coefficients unless the weight functions appearing in
the cost functional are constant. Certain accompanying conditions are needed to get unique solutions. Investigations show
that one half of the conditions should be given at the initial instant and the other half should be specified at the final
moment. Since the differential equations contain another unknown entity, deviation parameter, solutions must satisfy an algebraic
equation derived from the definition of this parameter. Results do not involve the explicit structure of the wave function
and costate function. Only the external field amplitude and the deviation parameter are determined here. The evaluation of
the wave function and costate function needs additional treatments to the control equations. We report certain analytical
results for external field amplitude and the deviation parameter and give certain illustrative implementations to finalize
the paper. 相似文献
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