Describes a laboratory exercise used by botany students to verify their textbook's teaching about photosynthesis and respiration. (ZWH)

Describes an inexpensive replacement for the gel matrix, agarose, to aid teachers in reducing the cost of supplies needed to perform gel electrophoresis experiments. (ZWH)

Describes a carefully integrated presentation of visuals, demonstrations, stage magic, and music used to familiarize laypersons as well as students with the applications and fascination of modern chemistry. Suggests that this approach can be used by others for classroom and/or public-oriented ventures. (JN)

Describes a freshman chemistry experiment in which students separate and identify commonly used drugs by thin-layer chromatography. Materials needed, procedures used, and typical results obtained are included. (JN)

Describes a low-cost ($120) device which eliminates plasma lines in Raman spectra. The device consists of two prisms and two mirrors which are held in a symmetrical relationship to one another so that a particular position will allow only one wavelength to pass through on a given axis. (JN)

Describes a simple and reliable new quantitative analysis experiment using liquid chromatography for the determinaiton of caffeine, saccharin, and sodium benzoate in beverages. Background information, procedures used, and typical results obtained are provided. (JN)

Describes a rapid, visual demonstration of protein separation by gel filtration chromatography. The procedure separates two highly colored proteins of different molecular weights on a Sephadex G-75 in 45 minutes. This time includes packing the column as well. Background information, reagents needed, procedures used, and results obtained are…

Describes a physical/organic chemistry experiment on conductance behavior of hydrogen-bonded species of six salts of easily accessible, nitrogen-containing bases and halogenoacetic acids. The bases and acids used are much cheaper and have comparatively less unpleasant odors than the pyrim puridines and trifluoroacetic acid used in previously…

Describes electricity experiments which can be used for such purposes as determining the magnetic field of a magnet, making an electromagnet, and showing the repulsion of like poles of a magnet. Includes list of materials needed, procedures used, and instructional strategies. (JN)

Background information, procedures used, and typical results obtained are provided for an experiment involving the separation of chlorophyll a and chlorophyll b from their diastereomers. Reasons why the experiment can be easily integrated into most laboratory curricula where high-performance liquid chromatography capabilities exist are given. (JN)

Provides a method for correcting the photoemission from a collector when using the photoelectric effect experiment to determine Planck's constant. The problem results from a negative current through the cell and makes the measurement of the cutoff potential difficult. (DH)

Background information, materials needed, laboratory procedures, and typical results are provided for five high performance liquid chromatography experiments (three isocratic and two step gradient separations). Suggestions for further experimentation are also provided, including quantitative determinations and separation of charged solutes. (JN)

When students think of evolution, they often think of those genetic changes that occur to make organisms different. This article describes how students can become better informed of convergent evolution, the process by which organisms with dissimilar ancestors come to resemble each other. (ZWH)

Describes an inexpensive, easily prepared demonstration to teach the concepts of human blood grouping, antigen-antibody reactions, and medical transfusions. (ZWH)

Describes an inexpensive method of measuring energy expenditure during exercise. Presents the materials needed to conduct the experiment, basic principles, procedures, calculation and analysis, and a discussion of results. (ZWH)