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THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

The Design and Analysis of Experiments

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

基礎講座 電気泳動(Electrophoresis)

https://recipp.ipp.pt/bitstream/10400.22/3012/4/ART_LuciaSantos_2010_GRAQ.pdf

Ecotoxicological aspects related to the presence of pharmaceuticals in the aquatic environment

Atomic emission spectroscopy coupled with capillary gas chromatography (GC) has been evaluated for molecular formula determination of several chlorinated and brominated compounds present in three environmental samples. Variations in elemental responses due to compound type, poor chromatographic resolution, and small signals relative to the background were all found to complicate molecular formula calculations. About 20% of the calculated molecular formulas presented in this paper agreed with theoretical values. For most applications, identifications based solely on GC coupled with theoretical values. For most applications, identifications based solely on GC coupled with atomic emission detection (AED) are not sufficiently accurate. However, the combination of elemental information derived form a GC-AED analysis with complementary data obtained from other detection techniques results in a strong analytical tool for analyte identification.

Molecular formula determination of halogenated compounds in environmental samples using gas chromatography and atomic emission dection

N-, O- and P-selective on-column atomic emission detection in capillary gas chromatography

A recently proposed method for the separation of fat-soluble vitamins by electrokinetic chromatography was further developed and investigated in the present study. The separation medium consisted of acetonitrile-water (80:20 v/v) and contained 80 mM tetradecylammonium bromide (TDA+); the content of acetonitrile served to maintain the hydrophobic vitamins dissolved during electrophoresis, while the TDA+ ions served as the pseudostationary phase. With the cathode placed at the outlet of the capillary, the fat-soluble vitamins were separated based on different hydrophobic interactions to the TDA+ ions and migrated in order of decreasing hydrophobicity prior to the electroosmotic flow. Migration time stability was significantly enhanced by the addition of 4 mM borate to the separation medium. The separation system was validated for the determination of vitamin E acetate in commercial tablets; quantitative results deviated by less than 3.5% from specified values, varying by less than 2.5% relative standard deviation (RSD) for within-day experiments, and by less than 6.5% RSD during between-day experiments. The separation system was compatible with injection solvents ranging in polarity from water to tetrahydrofuran, and was even capable of separating the water-soluble vitamins B1, B2, B12, and nicotinamide.

Analysis of vitamin formulations by electrokinetic chromatography utilizing tetradecylammonium ions as the pseudostationary phase

In this paper, we report the first example of employing a sacrificial electrode in the acceptor solution during electromembrane extraction (EME). The electrode was based on a silver wire with a lay...

https://pubs.acs.org/doi/pdf/10.1021/acs.analchem.0c00626

Electromembrane Extraction Using Sacrificial Electrodes.

Aim: Liquid–liquid extraction is widely used in therapeutic drug monitoring of antipsychotics, but difficulties in automation of the technique can result in long operational time. In this paper, parallel artificial liquid membrane extraction was used for extraction of serotonin– and serotonin–norepinephrine reuptake inhibitors from human plasma, and an approach to automate the technique was investigated. Results: Eight model analytes were extracted from 125 μl human plasma with recoveries in the range 72–111% (relative standard deviation [RSD] ≤12.8%). A semiautomated pipettor was successfully utilized in the procedure, reducing the manual handling time. Real patient samples were analyzed with satisfying accuracy. Conclusion: A semiautomated extraction of serotonin–and serotonin–norepinephrine reuptake inhibitors by parallel artificial liquid membrane extraction extraction was successfully performed.

Stig Pedersen-Bjergaard

Papers

Molecular formula determination of halogenated compounds in environmental samples using gas chromatography and atomic emission dection

N-, O- and P-selective on-column atomic emission detection in capillary gas chromatography

Analysis of vitamin formulations by electrokinetic chromatography utilizing tetradecylammonium ions as the pseudostationary phase

Electromembrane Extraction Using Sacrificial Electrodes.

Parallel artificial liquid membrane extraction of psychoactive analytes: a novel approach in therapeutic drug monitoring.