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Early Undergraduate Biostatistics & Data Science Introduction Using R, R Studio & the Tidyverse
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Del Toro, Israel; Dickson, Kimberly; Hakes, Alyssa S.; Newman, Shannon L. – American Biology Teacher, 2022
Increasingly, students training in the biological sciences depend on a proper grounding in biological statistics, data science and experimental design. As biological datasets increase in size and complexity, transparent data management and analytical methods are essential skills for undergraduate biologists. We propose that using the software R…
Descriptors: Undergraduate Students, Biology, Statistics Education, Data Analysis
Synthesis and Characterization of Calixarene Tetraethers: An Exercise in Supramolecular Chemistry for the Undergraduate Organic Laboratory
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Debbert, Stefan L.; Hoh, Bradley D.; Dulak, David J. – Journal of Chemical Education, 2016
In this experiment for an introductory undergraduate organic chemistry lab, students tetraalkylate tertbutylcalix[4]arene, a bowl-shaped macrocyclic oligophenol, and examine the supramolecular chemistry of the tetraether product by proton nuclear magnetic resonance (NMR) spectroscopy. Complexation with a sodium ion reduces the conformational…
Descriptors: Synthesis, Undergraduate Students, Organic Chemistry, Laboratory Experiments
Working for College: The Causal Impacts of Financial Grants on Undergraduate Employment
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Broton, Katharine M.; Goldrick-Rab, Sara; Benson, James – Educational Evaluation and Policy Analysis, 2016
One way in which financial aid is thought to promote college success is by minimizing the time students spend working. Yet, little research has examined if this intended first-order effect occurs, and results are mixed. We leverage a randomized experiment and find that students from low-income families in Wisconsin offered additional grant aid…
Descriptors: Undergraduate Students, Student Financial Aid, Tuition Grants, Student Employment
Determination of Calcium in Dietary Supplements: Statistical Comparison of Methods in the Analytical Laboratory
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Garvey, Sarah L.; Shahmohammadi, Golbon; McLain, Derek R.; Dietz, Mark L. – Journal of Chemical Education, 2015
A laboratory experiment is described in which students compare two methods for the determination of the calcium content of commercial dietary supplement tablets. In a two-week sequence, the sample tablets are first analyzed via complexometric titration with ethylenediaminetetraacetic acid and then, following ion exchange of the calcium ion present…
Descriptors: Dietetics, Comparative Analysis, Statistical Analysis, Laboratory Experiments
Discovering Inexpensive, Effective Catalysts for Solar Energy Conversion: An Authentic Research Laboratory Experience
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Shaner, Sarah E.; Hooker, Paul D.; Nickel, Anne-Marie; Leichtfuss, Amanda R.; Adams, Carissa S.; de la Cerda, Dionisia; She, Yuqi; Gerken, James B.; Pokhrel, Ravi; Ambrose, Nicholas J.; Khaliqi, David; Stahl, Shannon S.; Schuttlefield Christus, Jennifer D. – Journal of Chemical Education, 2016
Electrochemical water oxidation is a major focus of solar energy conversion efforts. A new laboratory experiment has been developed that utilizes real-time, hands-on research to discover catalysts for solar energy conversion. The HARPOON, or Heterogeneous Anodes Rapidly Perused for Oxygen Overpotential Neutralization, experiment allows an array of…
Descriptors: Energy Conservation, Energy, Science Laboratories, Science Experiments
An Alternative to the Computational Speech Intelligibility Index Estimates: Direct Measurement of Rectangular Passband Intelligibilities
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Warren, Richard M.; Bashford, James A., Jr.; Lenz, Peter W. – Journal of Experimental Psychology: Human Perception and Performance, 2011
The need for determining the relative intelligibility of passbands spanning the speech spectrum has been addressed by publications of the American National Standards Institute (ANSI). When the Articulation Index (AI) standard (ANSI, S3.5, 1969, R1986) was developed, available filters confounded passband and slope contributions. The AI procedure…
Descriptors: Articulation (Speech), National Standards, Prediction, Experiments
RFLP Analysis and Allelic Discrimination with Real-Time PCR Using the Human Lactase Persistence Trait: A Pair of Molecular Genetic Investigations
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Weinlander, Kenneth M.; Hall, David J.; De Stasio, Elizabeth A. – Biochemistry and Molecular Biology Education, 2010
We describe here two open-ended laboratory investigations for an undergraduate laboratory course that uses students' DNA as templates for quantitative real-time PCR and for traditional PCR followed by RFLP analysis. Students are captivated by the immediacy of the application and the relevance of the genotypes and traits, lactase persistence or…
Descriptors: Molecular Biology, Genetics, Laboratory Experiments, Undergraduate Students