Outlines experiments in which a density gradient might be used to advantage. A density gradient consists of a column of liquid, the composition and density of which varies along its length. The procedure can be used in analysis of solutions and mixtures and in density measures of solids. (Author/TS)

Describes a laboratory experiment for secondary school chemistry students utilizing the classic reaction between the iron(III) ion and the thiocyanate ion. The experiment also works very well in other chemistry courses as an experience in spectrophotometric analysis. (PVD)

Discusses a laboratory course to familiarize mechanical engineering students in the use of electronics and computers. Describes the objectives, laboratory facilities, lecture topics, projects, and laboratory exercises for the course. (YP)

Described is a procedure by which the performance of chemical hoods can be tested. This procedure uses a mixture of dry ice and water to create a "smoke" for use in the test. Implications for sash design, performance evaluations and testing under standard and nonstandard conditions are discussed. (CW)

Describes a thin film rectangular dielectric waveguide and its laboratory use. Discusses the theory of uniaxial thin film waveguides with mathematical expressions and the laboratory procedures for a classroom experiment with diagrams. (Author/YP)

Describes a simple halogenation experiment that can be performed quickly in an open vessel at room temperature with visible light that is appropriate for the beginning weeks of an introductory organic chemistry course. (WRM)

Describes the construction and use of an inexpensive, portable photometer designed specifically for estimating population sizes in yeast cultures. Suggests activities for use with the photometer. (WRM)

The purpose of this study was to develop and apply a scheme for the analysis of flow diagrams. The flow diagrams in question are a schematic representation of written instructions that require students to process the text of their practical manual. It was hoped that an analysis of the flow diagrams would provide insight into students'…

Laboratory demonstration, as well as biochemistry lecture, has been used to complement explanation of biochemical processes. The laboratory demonstration is very useful in teaching biochemistry to students who lack background in biology. The experimental model of fibrinolysis described here presents a complex biological reaction in simplified…

Discusses the code of the Royal Institute of Chemistry (RIC) in Great Britain concerning laboratory safety; includes sections on hazardous chemicals and techniques, and legal responsibilities. (MLH)

How teachers can make maximum use of listening for learning. (HB)

How Western Michigan University uses it's Multiple Audio Distribution (MAD) System for instruction. (HB)