Examines the usefulness of cyclic voltammetry to the determination of a complex compound's stoichiometry. Discusses the experimental design, laboratory equipment, and results. (CW)

Describes two complementary laboratory exercises that use the glass fiber assay to assess receptor specificity and hormone binding affinity in rat liver cytoplasmic extracts. Details the methods, materials and protocol of the experiments. Discusses the basic concepts illustrated and the feasibility of using the experiments at the undergraduate…

Describes an experiment to discover the topology of plasma membrane aminophospholipids (phosphatidylethanolamine and phosphatidylserine) using whole platelets and trinitrobenzene sulfonate (TNBS) as a probe. Reports changes in phospholipid distribution during platelet activation with simultaneous action of thrombia and collagen. Details the…

Describes how, using an overhead projector (OHP) and a transparent roll of acetate film, it is possible to demonstrate: (1) travelling waves; (2) standing waves; and (3) phase and group velocity applied to waves. The set-ups provide a way to demonstrate features which are normally difficult to visualize and understand. (JN)

Modeled after the program "Mastermind," this program teaches students the art of protein sequencing. The program (written in Turbo Pascal for the IBM PC, requiring 128K, a graphics adapter, and an 8070 mathematics coprocessor) generates a polypeptide whose sequence and length can be user-defined (for practice) or computer-generated (for…

Presents two simple techniques for physics demonstrations: (1) a projection lens system for oscilloscopes which uses an inexpensive surplus lens and enables the entire class to observe the screen; and (2) a polarized optical "Cheshire cat" which uses the overhead projector and Polaroid sheets. (JN)

Describes a demonstration in which gaseous ammonia and hydrochloric acid are used to illustrate rates of diffusion (Graham's Law). Simple equipment needed for the demonstration include a long tube, rubber stoppes, and cotton. Two related demonstrations are also explained. (DH)

Describes hardware and software requirements for interfacing a thermometer probe, via an analog and digital converter, to any Commodore PET, VIC-20, or Commodore-64 microcomputer (or other microcomputers with some modifications). Also describes use of the probe in an experiment measuring enthalpies of reaction to determine enthalpy of formation of…

The three principal commercially published science projects for less able/motivated students include units on electronics. A simple and inexpensive method of constructing electric circuits is described. Suggestions for making the material in the published units applicable to circuits found in everyday situations are offered. (JN)

Presents 23 experiments, activities, field projects and computer programs in the biological and physical sciences. Instructional procedures, experimental designs, materials, and background information are suggested. Topics include fluid mechanics, electricity, crystals, arthropods, limpets, acid neutralization, and software evaluation. (ML)

A new program for training upper secondary school chemistry teachers (SE 537 693) depends heavily on student project work. A project in which lead in hair and in red wine was examined by potentiometric stripping analysis is described and evaluated. (JN)

Describes a computer-based instructional unit in cardiovascular physiology. The program (which employs simulated laboratory experimental techniques with a problem-solving format is designed to supplement an animal laboratory and to offer students an integrative approach to physiology through use of microcomputers. Also presents an overview of the…

Explains the "Overview-Case Study Method" for teaching high school physics which has evolved from the author's experience/success with a program in which 90 percent of the high school's students take physics as an elective. Areas considered include methods, case studies, textbooks, multilevel physics, qualitative physics, and real-life…

Describes the analysis of dandelion peduncle growth based on peduncle length, epidermal cell dimensions, and fresh/dry mass. Methods are simple and require no special apparatus or materials. Suggests that limited practical work in this area may contribute to students' lack of knowledge on plant growth. (Author/DH)

Shows how an electric stud finder (available from hardware stores for $15-20) is used to detect changes in capacitance produced by changes in thickness of a medium or in dielectric constant. Also describes how to construct an inexpensive motor from a battery, rubber bands, ceramic magnet, and copper wire. (DH)