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 the following laboratory equipment: Biophysics modules to perform bioelectronic investigations of the human body; a large sine wave analog for large audience demonstrations; a resonance tube for measurement of speed of sound; and the snooperscope, a gadget to demonstrate infrared waves. (GA)

Fluorine, selenium, tin, and arsenic are among the trace elements occurring in the environment which are considered. Emphasis is given to developing a qualitative survey of the extent and kinds of metal transformations and their resultant effects. (CS)

Outlines a structure of practical work designed to overcome two weaknesses which militate against effective learning; the insufficient emphasis on the mastery of skills, and the lack of responsibility exhibited by students with respect to their own learning. (GA)

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)

Describes an experiment that utilizes fluorescence intensity measurements from a Spectronic 20 to determine the rate constant for the fluorescence quenching of various aromatic hydrocarbons by carbon tetrachloride in an ethanol solvent. (MLH)

Describes a versatile apparatus for demonstrating the imaging properties of various types of electrostatic lenses. The apparatus can be used to study the focusing properties of different types of electrostatic electron or ion lenses or their combinations. (MLH)

Many teachers have discovered the value of using newspapers in their classrooms. Suggests a number of specific, fun activities using this motivating and inexpensive resource. (Editor/RK)

A discussion of the teacher responsibility to student with regard to safety in the shop. (HD)

College physics students' understanding of the process of science, as measured by the Science Process Inventory, was better for students in a traditional, structured laboratory than in an inquiry laboratory that covered the same experiments. (MLH)

Presents short articles on: Le Chatelier's principle, the Lennard-Jones potential, chemical oscillations, solvent extraction efficiency, and nuclear magnetic resolution spectroscopy. (MLH)

Describes a reproducible wet technique for determining lead content of gasoline quantitatively or semi-quantitatively in three hours. (MLH)