The author offers laboratory procedures for experiments using the bacterium, Agrobacterium tumefaciens, which causes crown gall disease in a large number of plants. Three different approaches to growing a culture are given. (SA)

Presents background information, materials, calculations, and laboratory procedures for a physical chemistry experiment focused on the thermodynamics of a galvanic cell. (JN)

Examines the controversy surrounding the validity and interpretation of electron microscope images. (DS)

Presents background information, safety notes, and laboratory procedures for synthesizing dinitrogen and dihydrogen complexes of molybdenum. The one-step method described is suitable for advanced inorganic chemistry classes. (SK)

Describes an experiment in which a recycling oscillator has been designed having a fiber optic data link that closes the loop. Outlines the use of this wink-around system to determine the speed of light and suggests additional application for measuring integrated circuit propagation delays to subnanosecond resolution. (GS)

Describes a procedure for the synthesis and characterization of cobalt (III) complexes in one 6-hour laboratory period. Hydrogen peroxide is used for speeding up the preparation of these complexes if solutions are heated to complete the reaction. (Author/JN)

Describes a method suitable for quantitative studies of plant water status conducted by high school or college students and the calculation of the relative water content (RWC) of a plant. Materials, methods, procedures, and results are discussed, with sample data figures provided. (CS)

Describes an experiment on heat that utilizes only a styrofoam cup of coffee and a soda straw thermometer. (BT)

This laboratory experiment was designed for undergraduate students. It demonstrates the use of simplex optimization in a simple and straightforward manner. (BB)

An exercise is presented which demonstrates the determination of sample purity by differential scanning calorimetry. Data and references are provided to enable the exercise to be carried out as a dry-lab experiment. (BB)

The gravimetric determination of calcium as calcium carbonate is described. This experiment is suitable for undergraduate quantitative analysis laboratories. It is less expensive than determination of chloride as silver chloride. (BB)

This demonstration uses the electrophoresis of indicators to demonstrate the principles involved in the separation of isoenzymes. (BB)

Provides a look at the methods of paleoanthropology. The shape of a bone, the location of a muscle, or the wear on a tooth can help define environmental context and the course of species evolution. (BB)

Describes an experiment to characterize the enzyme polyphenol oxidase. Includes Purpose, Reagents and Equipment, Procedure, Extraction, Treatment of Data, and Discussion. (MA)

Describes the use of student-made photomicrographs as a source of student motivation and as a means for review of laboratory exercises in an introductory microbiology course. Includes an evaluation of this teaching method. (Author/MA)