Search Results - "Vitha, Mark"

Short Gas Chromatography Experiment That Richly Connects Thermodynamics to the Intermolecular Interactions That Govern Solute Retention by Vitha, Mark F.

“…This Article comes from a series of 2 h instrumental analysis laboratory experiments developed in response to social distancing requirements established…”
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Contemplative Fridays: Mindfulness Pedagogy in the General Chemistry Classroom by Vitha, Mark F.

“…This commentary describes a short, end-of-the-week meditation, contemplation, and visualization exercise for general chemistry classes called “Contemplative…”
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The chemical interpretation and practice of linear solvation energy relationships in chromatography by Vitha, Mark, Carr, Peter W.

“…This review focuses on the use of linear solvation energy relationships (LSERs) to understand the types and relative strength of the chemical interactions that…”
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Threshold Concepts in Analytical Chemistry by Claus, Michael J., Gionfriddo, Emanuela, Monahan, Jennifer, Whelan, Rebecca J., Vitha, Mark F.

“…Interest in “threshold concepts”ideas that, once mastered, transform a student’s thinking about the disciplinehas grown in recent years. Most chemistry…”
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Chromatographic selectivity triangles by Johnson, Andrew R., Vitha, Mark F.

“…2010 marked the 50th anniversary of the use of selectivity triangles to characterize chromatographic phases. Such plots ultimately identify and quantify the…”
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Cholesterol Effect on the Dipole Potential of Lipid Membranes by Starke-Peterkovic, Thomas, Turner, Nigel, Vitha, Mark F., Waller, Mark P., Hibbs, David E., Clarke, Ronald J.

“…The effect of cholesterol removal by methyl- β-cyclodextrin on the dipole potential, ψ d, of membrane vesicles composed of natural membrane lipids extracted…”
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Identifying orthogonal and similar reversed phase liquid chromatography stationary phases using the system selectivity cube and the hydrophobic subtraction model by Johnson, Andrew R., Johnson, Carrie M., Stoll, Dwight R., Vitha, Mark F.

“…► The system selectivity cube (SSC) guides RPLC column selection. ► The SSC can identify RPLC columns with similar and different selectivities. ► Column…”
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Comparison of excitation and emission ratiometric fluorescence methods for quantifying the membrane dipole potential by Vitha, Mark F., Clarke, Ronald J.

“…We are interested in developing fluorescence methods for quantifying lateral variations in the dipole potential across cell surfaces. Previous work in this…”
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“Retention Projection” Enables Reliable Use of Shared Gas Chromatographic Retention Data Across Laboratories, Instruments, and Methods by Barnes, Brian B, Wilson, Michael B, Carr, Peter W, Vitha, Mark F, Broeckling, Corey D, Heuberger, Adam L, Prenni, Jessica, Janis, Gregory C, Corcoran, Henry, Snow, Nicholas H, Chopra, Shilpi, Dhandapani, Ramkumar, Tawfall, Amanda, Sumner, Lloyd W, Boswell, Paul G

“…Gas chromatography/mass spectrometry (GC/MS) is a primary tool used to identify compounds in complex samples. Both mass spectra and GC retention times are…”
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An Advanced, Interactive, High-Performance Liquid Chromatography Simulator and Instructor Resources by Boswell, Paul G, Stoll, Dwight R, Carr, Peter W, Nagel, Megan L, Vitha, Mark F, Mabbott, Gary A

“…High-performance liquid chromatography (HPLC) simulation software has long been recognized as an effective educational tool, yet many of the existing HPLC…”
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System Selectivity Cube: A 3D Visualization Tool for Comparing the Selectivity of Gas Chromatography, Supercritical-Fluid Chromatography, High-Pressure Liquid Chromatography, and Micellar Electrokinetic Capillary Chromatography Systems by Johnson, Andrew R, Vitha, Mark F, Urness, Timothy, Marrinan, Thomas

“…A three-dimensional visualization tool termed the system selectivity cube (SSC) has been developed to aid in the selection of chromatography systems. The most…”
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Orientational polarisability of lipid membrane surfaces by Le Goff, Gaëlle, Vitha, Mark F., Clarke, Ronald J.

“…Here we present a fluorescence method based on the Stokes shift of the voltage-sensitive dye di-8-ANEPPS to quantify the orientational polarisability of lipid…”
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High-throughput analysis for food safety by Wang, Perry G, Vitha, Mark F, Kay, Jack F

“…This book focuses on high-throughput analyses for food safety. Because of the contributors domestic and international expertise from industry and government…”
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Mechanistic implications of the equality of compensation temperatures in chromatography by Ranatunga, Ravi, Vitha, Mark F., Carr, Peter W.

“…A common interpretation of the observation that two processes exhibit similar compensation temperatures in an enthalpy–entropy plot is that the two processes…”
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Study of the Polarity and Hydrogen-Bond Ability of Dodecyltrimethylammonium Bromide Micelles by the Kamlet−Taft Solvatochromic Comparison Method by Vitha, Mark F, Carr, Peter W

“…We have studied the dipolarity/polarizability (π*), hydrogen-bond donor acidity (α), and hydrogen-bond acceptor basicity (β) of dodecyltrimethylammonium…”
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The Chemical Meaning of the Standard Free Energy of Transfer:  Use of van der Waals' Equation of State To Unravel the Interplay between Free Volume, Volume Entropy, and the Role of Standard States by Vitha, Mark F, Carr, Peter W

“…Recently, in an attempt to refine the chemical interpretation of the free energy of transfer of a solute between two phases, Honig et al. introduced a “volume…”
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Determining the Percent Water in Organic Solvents Using the Zwitterionic Dimroth-Reichardt Betaine ET-30 Dye. An Industrially Relevant Application of a Previously Published Laboratory Experiment by Vitha, Mark F

“…Recently in this Journal, Deng and Acree described the use of the solvatochromic dye ET-30 to teach the fundamental basis of UV-vis spectroscopy. A new…”
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Chemical Meaning of the Standard Free Energy of Transfer. 2. Use of van der Waals' Equation of State To Evaluate the Enthalpic and Entropic Contributions of Free Volume and Attractive Forces to Chemical Potentials by Vitha, Mark F, Carr, Peter W

“…In a previous paper we derived an equation for the chemical potential of a nonideal, infinitely dilute solute in a van der Waals fluid. From this we also…”
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Appropriate Use of Blanks, Standards, and Controls in Chemical Measurements by Vitha, Mark F, Carr, Peter W, Mabbott, Gary A

“…It is critical to teach students the use of control samples, blanks, standards, dummy analyses, and system suitability checks to increase confidence in…”
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Solvent Strength Parameters and Retention Factors in Pure Water Using UNIFAC-Predicted Activity Coefficients by Park, Jung Hag, Jung, Vitha, Mark F, Carr, Peter W

“…It is well-known in reversed-phase liquid chromatography that the solute retention factor (k) in binary eluents is well modeled as a quasi-linear function of…”
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