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Artykuły w czasopismach na temat „Chromtography coupled to a mass spectrometer”

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Data publikacji: 14 września 2024

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1

de Moraes, Janderson Aparecido, Emanuel Carrilho i Nilson Antonio Assunção. "Homemade Capillary Electrophoresis Coupled to a Mass Spectrometer". Journal of Liquid Chromatography & Related Technologies 38, nr 1 (2.10.2014): 36–43. http://dx.doi.org/10.1080/10826076.2013.864982.

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2

D'Ulivo, Lucia, Lu Yang, Yong-Lai Feng, John Murimboh i Zoltán Mester. "Speciation of organometals using a synchronizing GC-EIMS and GC-ICPMS system for simultaneous detection". J. Anal. At. Spectrom. 29, nr 6 (2014): 1132–37. http://dx.doi.org/10.1039/c4ja00034j.

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Accurate quantitation and characterization of organometals are successfully achieved by splitting the gas chromatography (GC) flow to both an electron ionization mass spectrometer (EIMS) and an inductively coupled plasma mass spectrometer (ICPMS).

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3

Wilson, Daniel A., George H. Vickers, Gary M. Hieftje i Andrew T. Zander. "Analytical characteristics of an inductively coupled plasma-mass spectrometer". Spectrochimica Acta Part B: Atomic Spectroscopy 42, nr 1-2 (styczeń 1987): 29–38. http://dx.doi.org/10.1016/0584-8547(87)80047-2.

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4

Furuta, Naoki, Curtis A. Monnig, Pengyuan Yang i Gary M. Hieftje. "Noise characteristics of an inductively coupled plasma-mass spectrometer". Spectrochimica Acta Part B: Atomic Spectroscopy 44, nr 7 (styczeń 1989): 649–56. http://dx.doi.org/10.1016/0584-8547(89)80063-1.

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5

Pulliam, Christopher J., Pu Wei, Dalton T. Snyder, Xiao Wang, Zheng Ouyang, Rafal M. Pielak i R. Graham Cooks. "Rapid discrimination of bacteria using a miniature mass spectrometer". Analyst 141, nr 5 (2016): 1633–36. http://dx.doi.org/10.1039/c5an02575c.

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6

Dualde, Pablo, Clara Coscollà, Agustin Pastor i Vicent Yusà. "Optimization of Resolving Power, Fragmentation, and Mass Calibration in an Orbitrap Spectrometer for Analysis of 24 Pesticide Metabolites in Urine". International Journal of Analytical Chemistry 2019 (17.04.2019): 1–12. http://dx.doi.org/10.1155/2019/1917369.

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Mass spectrometer parameters such as Resolving Power, type of fragmentation, and mass calibration mode were optimized in the analysis of 24 pesticide metabolites in human urine using Ultra-High Pressure Liquid Chromatography coupled to Orbitrap High-Resolution Mass Spectrometer (UHPLC-HRMS). The best results were achieved with a Resolving Power of 25,000 FWHM and by applying Collision Induced Dissociation fragmentation mode (40 eV).

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7

Hartmanová, L., I. Lorencová, M. Volný, P. Fryčák, V. Havlíček, H. Chmelíčková, T. Ingr i K. Lemr. "Lateral resolution of desorption nanoelectrospray: a nanospray tip without nebulizing gas as a source of primary charged droplets". Analyst 141, nr 7 (2016): 2150–54. http://dx.doi.org/10.1039/c5an02665b.

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8

TAKAHASHI, Junichi, i Reinosuke HARA. "Analytical features of SPQ6100 inductively coupled plasma source mass spectrometer." Analytical Sciences 4, nr 3 (1988): 331–33. http://dx.doi.org/10.2116/analsci.4.331.

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9

Suzuki, T., C. Kanzaki, M. Nomura i Y. Fujii. "Zinc isotope discrimination effect in inductively coupled plasma mass spectrometer". Review of Scientific Instruments 75, nr 5 (maj 2004): 1931–33. http://dx.doi.org/10.1063/1.1702105.

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10

Iyer, Janaki Krishnamoorthy, Reka A. Otvos, Jeroen Kool i R. Manjunatha Kini. "Microfluidic Chip–Based Online Screening Coupled to Mass Spectrometry". Journal of Biomolecular Screening 21, nr 2 (31.08.2015): 212–20. http://dx.doi.org/10.1177/1087057115602648.

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Thrombin and factor Xa (FXa) are critical enzymes of the blood coagulation cascade and are excellent targets of anticoagulant agents. Natural sources present an array of anticoagulants that can be developed as antithrombotic drugs. High-resolution, online screening techniques have been developed for the identification of drug leads from complex mixtures. In this study, we have developed and optimized a microfluidic online screening technique coupled to nano–liquid chromatography (LC) and in parallel with a mass spectrometer for the identification of thrombin and FXa inhibitors in mixtures. Inhibitors eluting from the nano-LC were split postcolumn in a 1:1 ratio; half was fed into a mass spectrometer (where its mass is detected), and the other half was fed into a microfluidic chip (which acts as a microreactor for the online assays). With our platform, thrombin and FXa inhibitors were detected in the assay in parallel with their mass identification. These methods are suitable for the identification of inhibitors from sample amounts as low as sub-microliter volumes.

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11

Vonderach, Thomas, i Detlef Günther. "Fundamental studies on droplet throughput and the analysis of single cells using a downward-pointing ICP-time-of-flight mass spectrometer". Journal of Analytical Atomic Spectrometry 36, nr 12 (2021): 2617–30. http://dx.doi.org/10.1039/d1ja00243k.

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A downward inductively coupled plasma (ICP) was coupled to a time-of-flight mass spectrometer (TOFMS) and monodisperse microdroplets were used to study its capabilities and analyze single biological cells.

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12

Gómez-Ríos, Germán Augusto, Tijana Vasiljevic, Emanuela Gionfriddo, Miao Yu i Janusz Pawliszyn. "Towards on-site analysis of complex matrices by solid-phase microextraction-transmission mode coupled to a portable mass spectrometer via direct analysis in real time". Analyst 142, nr 16 (2017): 2928–35. http://dx.doi.org/10.1039/c7an00718c.

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13

Neise, Christin, Christine Rautenberg, Ursula Bentrup, Martin Beck, Mathias Ahrenberg, Christoph Schick, Olaf Keßler i Udo Kragl. "Stability studies of ionic liquid [EMIm][NTf2] under short-term thermal exposure". RSC Advances 6, nr 54 (2016): 48462–68. http://dx.doi.org/10.1039/c6ra06129j.

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14

Bussan, Derek D., Ryan F. Sessums i James V. Cizdziel. "Direct mercury analysis in environmental solids by ICP-MS with on-line sample ashing and mercury pre-concentration using a direct mercury analyzer". Journal of Analytical Atomic Spectrometry 30, nr 7 (2015): 1668–72. http://dx.doi.org/10.1039/c5ja00087d.

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A commercially available direct mercury analyzer (DMA) based on sample combustion, pre-concentration by amalgamation with gold, and atomic absorption spectrophotometry (AAS) was coupled to a sector field inductively coupled plasma mass spectrometer (ICP-MS).

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15

Nielsen, Sune G., Jeremy D. Owens i Tristan J. Horner. "Analysis of high-precision vanadium isotope ratios by medium resolution MC-ICP-MS". Journal of Analytical Atomic Spectrometry 31, nr 2 (2016): 531–36. http://dx.doi.org/10.1039/c5ja00397k.

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We present and verify a new method to measure vanadium isotope ratios using a Thermo Scientific Neptune multi-collector inductively-coupled plasma mass spectrometer (MC-ICP-MS) operated in medium mass resolution mode.

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16

Merlier, Franck, Rachid Jellali i Eric Leclerc. "Online monitoring of hepatic rat metabolism by coupling a liver biochip and a mass spectrometer". Analyst 142, nr 19 (2017): 3747–57. http://dx.doi.org/10.1039/c7an00973a.

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17

Cheng, Bing-Ming, J. R. Grover, E. A. Walters i J. T. Clay. "Kinetic energy release distributions from dissociative photoionization of weakly bound trimers at 14–27 eV". Physical Chemistry Chemical Physics 20, nr 32 (2018): 21034–42. http://dx.doi.org/10.1039/c8cp03013h.

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18

Nam, Soo Wan, i Jung Hoe Kim. "Indirect estimation of cell mass and substrate concentration using a computer-coupled mass spectrometer". Journal of Fermentation and Bioengineering 77, nr 3 (styczeń 1994): 332–34. http://dx.doi.org/10.1016/0922-338x(94)90246-1.

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19

Patil, Avinash A., Szu-Wei Chou, Pei-Yu Chang, Chen-Wei Lee, Chun-Yen Cheng, Ming-Lee Chu i Wen-Ping Peng. "High Mass Ion Detection with Charge Detector Coupled to Rectilinear Ion Trap Mass Spectrometer". Journal of The American Society for Mass Spectrometry 28, nr 6 (13.12.2016): 1066–78. http://dx.doi.org/10.1007/s13361-016-1548-0.

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20

Ślęzak, Radosław, Paulina Nawrot i Stanisław Ledakowicz. "Pyrolysis of micro- and macroalgae in thermobalance coupled with mass spectrometer". Algal Research 66 (lipiec 2022): 102782. http://dx.doi.org/10.1016/j.algal.2022.102782.

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21

Koppenaal, David W., Charles J. Barinaga i Monty R. Smith. "Performance of an inductively coupled plasma source ion trap mass spectrometer". Journal of Analytical Atomic Spectrometry 9, nr 9 (1994): 1053. http://dx.doi.org/10.1039/ja9940901053.

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22

Pritzl, G., F. Stuer-lauridsen, L. Carlsen, A. K. Jensen i T. K. Thorsen. "A Versatile Capillary Gas Chromatography Inductively Coupled Plasma Mass Spectrometer Interface". International Journal of Environmental Analytical Chemistry 62, nr 2 (luty 1996): 147–59. http://dx.doi.org/10.1080/03067319608027061.

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23

Powell, M. J., D. W. Boomer i R. J. McVicars. "Introduction of gaseous hydrides into an inductively coupled plasma mass spectrometer". Analytical Chemistry 58, nr 13 (listopad 1986): 2864–67. http://dx.doi.org/10.1021/ac00126a061.

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24

Crain, Jeffrey S., R. S. Houk i David E. Eckels. "Noise power spectral characteristics of an inductively coupled plasma-mass spectrometer". Analytical Chemistry 61, nr 6 (15.03.1989): 606–12. http://dx.doi.org/10.1021/ac00181a022.

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25

Solyom, David A., Ole A. Gron, James H. Barnes IV i Gary M. Hieftje. "Analytical capabilities of an inductively coupled plasma Mattauch–Herzog mass spectrometer". Spectrochimica Acta Part B: Atomic Spectroscopy 56, nr 9 (wrzesień 2001): 1717–29. http://dx.doi.org/10.1016/s0584-8547(01)00276-2.

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26

El Rahim, M. Abd, R. Antoine, L. Arnaud, M. Broyer, D. Rayane, A. Viard i Ph Dugourd. "Time-of-flight mass spectrometer coupled to a position sensitive detection". European Physical Journal D 34, nr 1-3 (lipiec 2005): 15–18. http://dx.doi.org/10.1140/epjd/e2005-00101-2.

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27

Russ, G. Price, i J. M. Bazan. "Isotopic ratio measurements with an inductively coupled plasma source mass spectrometer". Spectrochimica Acta Part B: Atomic Spectroscopy 42, nr 1-2 (styczeń 1987): 49–62. http://dx.doi.org/10.1016/0584-8547(87)80049-6.

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28

Lee, Siew Pei, Anita Ramli, Muralithran G. Kutty i Sharifah Bee A. Hamid. "Incorporation of Pd Nanoparticles on Rod and Necklace-Like SBA-15 Supports Materials". Advanced Materials Research 917 (czerwiec 2014): 10–17. http://dx.doi.org/10.4028/www.scientific.net/amr.917.10.

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Ion-exchange of palladium (Pd) precursor for two different types of well-ordered SBA-15 morphologies, necklace-like and rod-like, was studied. Approximately 3.8 wt% Pd was successfully incorporated into SBA-15 at pH 10.3. Formation of SBA-15 and Pd/SBA-15 were characterized by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Thermogravimetry with Simultaneous Difference Thermal Spectroscopy coupled with mass spectrometer (TG/SDTA-MS), Thermogravimetry in combination with Simultaneous Difference Thermal Spectroscopy (TG-SDTA), Inductive Coupled Plasma Mass Spectrometer (ICP-MS) and N2 adsorption-desorption. Reduction of surface area and pore volume of support for Pd/SBA-15 samples may indicate the encapsulation of PdO particles within mesoporous channels of SBA-15.

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29

Strashnov, Ilya, Igor Izosimov, Jamie D. Gilmour, Melissa Anne Denecke, Jose Almiral, Andrew Cannavan, Gang Chen i in. "A laser ablation resonance ionisation mass spectrometer (LA-RIMS) for the detection of isotope ratios of uranium at ultra-trace concentrations from solid particles and solutions". Journal of Analytical Atomic Spectrometry 34, nr 8 (2019): 1630–38. http://dx.doi.org/10.1039/c9ja00030e.

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30

Li, Weiqiang, Brian L. Beard i Shilei Li. "Precise measurement of stable potassium isotope ratios using a single focusing collision cell multi-collector ICP-MS". Journal of Analytical Atomic Spectrometry 31, nr 4 (2016): 1023–29. http://dx.doi.org/10.1039/c5ja00487j.

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31

Vanhoe, Hans, Steven Saverwijns, Magali Parent, Luc Moens i Richard Dams. "Analytical characteristics of an inductively coupled plasma mass spectrometer coupled with a thermospray nebulization system". Journal of Analytical Atomic Spectrometry 10, nr 9 (1995): 575. http://dx.doi.org/10.1039/ja9951000575.

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32

Bezrukov, Andrei, i Igor Zarubin. "METHODS FOR IMPROVEMENT OF HIGH-RESOLUTION SPECTROMETER CHARACTERISTICS". Interexpo GEO-Siberia 8 (2019): 226–37. http://dx.doi.org/10.33764/2618-981x-2019-8-226-237.

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The present paper demonstrates results of high-resolution spectrometer characteristics improvement methods. Increasing resolution, spectral range extending and illumination efficiency for the spectrometer were investigated. Obtained results will be found useful in atomic spectroscopy applications such as atomic absorption, atomic emission spectroscopy, mass-spectroscopy, chromatography and others. In order to increase spectrometer resolution it was suggested to use higher diffractive grating curvature radius. Experimentally, characteristics of both spectrometer prototypes assembled using diffractive gratings R1000 and R2000 were obtained and compared. New approach for polychromatous displacement was developed in order to extend operational spectrum range. The main feature is single spectrometer entrance slit for both UV and visible range Paschen-Runge polychromatous with beam splitting by coupled flat folding mirrors placed behind slit. Diffractive grating illumination monitor system was designed in order to provide this spectrometer by alignment control for lightning system. New spectrometer “Grand-2” was fabricated. It includes coupled Paschen-Runge polychromators for UV and visible spectral range providing 12 and 30 pm spectral resolution respectively with single entrance slit equipped with diffractive grating illumination monitoring system. This spectrometer can be used for various atomic spectroscopy applications.

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33

O'Leary, Adam E., Seth E. Hall, Kyle E. Vircks i Christopher C. Mulligan. "Monitoring the clandestine synthesis of methamphetamine in real-time with ambient sampling, portable mass spectrometry". Analytical Methods 7, nr 17 (2015): 7156–63. http://dx.doi.org/10.1039/c5ay00511f.

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In this paper, an ambient sampling, portable mass spectrometer coupled to a selection on ambient ionization methods was used to perform real-time reaction monitoring of clandestine methamphetamine syntheses.

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34

Guo, Changjuan, Zhengxu Huang, Wei Gao, Huiqing Nian, Huayong Chen, Jiamo Fu i Zhen Zhou. "Combining a Capillary with a Radio-Frequency-Only Quadrupole as an Interface for a Home-Made Time-of-Flight Mass Spectrometer". European Journal of Mass Spectrometry 13, nr 4 (sierpień 2007): 249–57. http://dx.doi.org/10.1255/ejms.884.

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A heated capillary tube combined with a radio-frequency-only quadrupole has been coupled with a home-made, high-resolution orthogonal-injection, time-of-flight mass spectrometer to improve ion transmission from the atmospheric pressure to the low-pressure regions. With an electrospray ion source, the performance of the interface on the intensity of spectra was investigated. For electrospray ionization, the ion intensity detected on the time-of-flight mass spectrometer was seen to increase three-fold compared with an orifice interface. It has been shown that the enhanced ion inlet designs can not only increase the ion translation efficiency, but also improve the detection limits of the mass spectrometer. Coupling atmospheric pressure matrix-assisted laser desorption/ionization with the improved interface resulted in an instrument detection limit as low as 2.5 fmol.

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35

Díaz-Alejo, Héctor M., Victoria López-Rodas, Camino García-Balboa, Francisco Tarín, Ana I. Barrado, Estefanía Conde i Eduardo Costas. "The Upcoming 6Li Isotope Requirements Might Be Supplied by a Microalgal Enrichment Process". Microorganisms 9, nr 8 (17.08.2021): 1753. http://dx.doi.org/10.3390/microorganisms9081753.

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Lithium isotopes are essential for nuclear energy, but new enrichment methods are required. In this study, we considered biotechnology as a possibility. We assessed the Li fractionation capabilities of three Chlorophyte strains: Chlamydomonas reinhardtii, Tetraselmis mediterranea, and a freshwater Chlorophyte, Desmodesmus sp. These species were cultured in Li containing media and were analysed just after inoculation and after 3, 12, and 27 days. Li mass was determined using a Inductively Coupled Plasma Mass Spectrometer, and the isotope compositions were measured on a Thermo Element XR Inductively Coupled Plasma Mass Spectrometer. The maximum Li capture was observed at day 27 with C. reinhardtii (31.66 µg/g). Desmodesmus sp. reached the greatest Li fractionation, (δ6 = 85.4‰). All strains fractionated preferentially towards 6Li. More studies are required to find fitter species and to establish the optimal conditions for Li capture and fractionation. Nevertheless, this is the first step for a microalgal nuclear biotechnology.

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36

Roscioli, Kristyn M., Jessica A. Tufariello, Xing Zhang, Shelly X. Li, Gilles H. Goetz, Guilong Cheng, William F. Siems i Herbert H. Hill. "Desorption electrospray ionization (DESI) with atmospheric pressure ion mobility spectrometry for drug detection". Analyst 139, nr 7 (2014): 1740–50. http://dx.doi.org/10.1039/c3an02113k.

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Desorption electrospray ionization (DESI) was coupled to an ambient pressure drift tube ion mobility time-of-flight mass spectrometer (IM-TOFMS) for the direct analysis of active ingredients in pharmaceutical samples.

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37

Bourgalais, Jérémy, Zied Gouid, Olivier Herbinet, Gustavo A. Garcia, Philippe Arnoux, Zhandong Wang, Luc-Sy Tran i in. "Isomer-sensitive characterization of low temperature oxidation reaction products by coupling a jet-stirred reactor to an electron/ion coincidence spectrometer: case of n-pentane". Physical Chemistry Chemical Physics 22, nr 3 (2020): 1222–41. http://dx.doi.org/10.1039/c9cp04992d.

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Using a tunable vacuum ultraviolet synchrotron beam line and first principle computations, a jet-stirred reactor was coupled for the first time to a photoionization mass spectrometer using electron/ion coincidence imaging.

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38

Liu, Xiao-Ming, i Wenshuai Li. "Optimization of lithium isotope analysis in geological materials by quadrupole ICP-MS". Journal of Analytical Atomic Spectrometry 34, nr 8 (2019): 1708–17. http://dx.doi.org/10.1039/c9ja00175a.

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This study develops and optimizes a new method to measure lithium isotope ratios using a single collector quadrupole inductively coupled plasma mass spectrometer (Q-ICP-MS) operated under hot plasma (1550 W) conditions.

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39

Jiao, Shi, i John W. Olesik. "Characterization of matrix effects using an inductively coupled plasma-sector field mass spectrometer". Journal of Analytical Atomic Spectrometry 35, nr 9 (2020): 2033–56. http://dx.doi.org/10.1039/d0ja00207k.

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40

Hitchen, Peter, Robert Hutton i Christopher Tye. "The applications of a commercial gas/liquid separator coupled with an inductively coupled plasma mass spectrometer". Journal of Automatic Chemistry 14, nr 1 (1992): 17–23. http://dx.doi.org/10.1155/s146392469200004x.

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A commercially available hydride generator, with a novel membrane gas-liquid separator, has been coupled to a new ICPMS instrument which itself features many unique design considerations. Little or no optimization of the mass spectrometer or ionization source was required to obtain excellent analytical data; and a variety of matrices have been analysed.The elements As and Se are usually used to demonstrate the effectiveness of a hydride generation system, and these are of particular importance, bearing in mind potential Ar molecular overlaps with isotopes of interest. The flexibility of the hydride generation ICP-MS system is highlighted, with the inclusion of analytical figures of merit for the elements Sn, Sb, Ge and Hg, as well as As and Se. Data obtained by ‘standard’ pneumatic nebulization on the ICP-MS is compared with that obtained with the hydride generator for all of the elements.Improvements of between 50 and 100 times were gained in measurements of three sigma detection limits for all elements in the determinations, including Hg. Measurements were made on several isotopes for particular elements, and the data is included for the purposes of comparison. Stabilities of between 1 and 2.5% were obtained for 0.5 ppb solutions over 10 min measurement periods, all data is presented without using an internal standard.Finally, analytical data from seawater standards, spiked with low levels of As and Se and calibrated against aqueous standards, demonstrate excellent recoveries. This is of particular interest bearing in mind the well-documented molecular interferences from high chloride matrices on As and Se analysis.

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Caudillo, Lucía, Mihnea Surdu, Brandon Lopez, Mingyi Wang, Markus Thoma, Steffen Bräkling, Angela Buchholz i in. "An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles". Atmospheric Chemistry and Physics 23, nr 11 (15.06.2023): 6613–31. http://dx.doi.org/10.5194/acp-23-6613-2023.

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Abstract. Currently, the complete chemical characterization of nanoparticles (< 100 nm) represents an analytical challenge, since these particles are abundant in number but have negligible mass. Several methods for particle-phase characterization have been recently developed to better detect and infer more accurately the sources and fates of sub-100 nm particles, but a detailed comparison of different approaches is missing. Here we report on the chemical composition of secondary organic aerosol (SOA) nanoparticles from experimental studies of α-pinene ozonolysis at −50, −30, and −10 ∘C and intercompare the results measured by different techniques. The experiments were performed at the Cosmics Leaving OUtdoor Droplets (CLOUD) chamber at the European Organization for Nuclear Research (CERN). The chemical composition was measured simultaneously by four different techniques: (1) thermal desorption–differential mobility analyzer (TD–DMA) coupled to a NO3- chemical ionization–atmospheric-pressure-interface–time-of-flight (CI–APi–TOF) mass spectrometer, (2) filter inlet for gases and aerosols (FIGAERO) coupled to an I− high-resolution time-of-flight chemical ionization mass spectrometer (HRToF-CIMS), (3) extractive electrospray Na+ ionization time-of-flight mass spectrometer (EESI-TOF), and (4) offline analysis of filters (FILTER) using ultra-high-performance liquid chromatography (UHPLC) and heated electrospray ionization (HESI) coupled to an Orbitrap high-resolution mass spectrometer (HRMS). Intercomparison was performed by contrasting the observed chemical composition as a function of oxidation state and carbon number, by estimating the volatility and comparing the fraction of volatility classes, and by comparing the thermal desorption behavior (for the thermal desorption techniques: TD–DMA and FIGAERO) and performing positive matrix factorization (PMF) analysis for the thermograms. We found that the methods generally agree on the most important compounds that are found in the nanoparticles. However, they do see different parts of the organic spectrum. We suggest potential explanations for these differences: thermal decomposition, aging, sampling artifacts, etc. We applied PMF analysis and found insights of thermal decomposition in the TD–DMA and the FIGAERO.

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42

NONOSE, Naoko. "Formation of Interfering Polyatomic Ion Species in Inductively Coupled Plasma Mass Spectrometer." Journal of the Mass Spectrometry Society of Japan 45, nr 1 (1997): 77–89. http://dx.doi.org/10.5702/massspec.45.77.

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43

Auxier, Jerrad P., John D. Auxier II i Howard L. Hall. "Coupling a Gas Chromatography Unit to an Inductively Coupled Plasma Mass Spectrometer". World Journal of Nuclear Science and Technology 07, nr 02 (2017): 84–92. http://dx.doi.org/10.4236/wjnst.2017.72007.

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44

Ibrahim, N. "EVALUATION ZULFI GROUND WATER QUALITY USING INDUCTIVELY COUPLED PLASMA-MASS SPECTROMETER (ICPMS)." International Journal of Advanced Research 5, nr 5 (31.05.2017): 440–44. http://dx.doi.org/10.21474/ijar01/4129.

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