Describes a laboratory experiment which explores the effects of adding inert salts to electrolytic cells and demonstrates the difference between concentration and chemical activity. Examines chemical potentials as the driving force of reactions. Provides five examples of cell potential and concentration change. (JM)

Provides a description of a computer program developed to supplement instruction in testing of antibiotics on clinical isolates of microorganisms. The program is a simulation and database for interpretation of experimental data designed to enhance laboratory learning and prepare future physicians to use computerized diagnostic instrumentation and…

Discusses the culturing of microorganisms as a laboratory activity emphaszing the growth of microorganisms in food. Provides background and safety information, procedures, and additional ideas. The complete unit (teacher's guide, student worksheets, evaluation and assessment, and resources for students and teachers) is available from the author.…

This article furnishes statistical data from a survey of university language/learning laboratories. The nature of the facility, distribution of disciplines and technologies, supervisor information including academic rank, title, degree, sex, salary, and information about other employees in 89 universities are included. (CHK)

The guide presents information about ordering, using, storing, and maintaining chemicals in the high school laboratory. The guide also provides information about chemical waste, safety and emergency equipment, assessing chemical hazards, common safety symbols and signs, and fundamental resources relating to chemical safety, such as Material…

Discusses the use of a simple apparatus to measure contact angles between a liquid drop and a solid surface which are determining factors of wettability. Included are examples of applying this technique to various experimental situations. (CC)

Discusses the use of a modified electron spin resonance apparatus to demonstrate some features of the expression for the transition probability per second between two energy levels. Applications to the third year laboratory program are suggested. (CC)