Demonstrates how leaf slices provide an inexpensive material for illustrating several fundamental points about the biochemistry of photosynthesis and respiration. Presents experiments that illustrate the effects of photon flux density and herbicides and carbon dioxide concentration. (DDR)

Argues that the debate on whether to use performance-based versus prescriptive measurement approaches to environmental measurements is unnecessary. Believes that, as project managers gain more experience using data-quality objectives, the performance-based approach will become more popular. (MDH)

Describes an experiment in which plasmid DNA is digested with restriction enzymes that cleave the plasmid either once or twice. The DNA is stained, loaded on a gel, electrophoresed, and viewed under normal laboratory conditions during electrophoresis. (DDR)

Describes the study of dung-inhabiting or coprophilous fungi to illustrate basic lab techniques and fundamental ecological concepts. Contains 24 references. (WRM)

Presents methods that can be used to isolate the enzyme tyrosinase and to assay its activity. Lists instructions for a laboratory activity that has variable but frequently dramatic results. (WRM)

The present research describes an efficient procedure to obtain high levels of trypsinogen and chymotrypsinogen by using a simple, rapid, and easily reproducible method. The extraction process and the time-course of activation of zymogens can be carried out in a single laboratory period, without sophisticated equipment. The main objective was to…

Describes a training program for teaching assistants who presented laboratory instruction in a biology course and attended weekly seminars, in addition to being observed and video-taped while teaching. (LS)

Describes an exercise that teaches Mendelian inheritance using human traits which students find exciting and relevant. (LS)

An experimental psychology course which analyzes the broad probability of operant conditioning is described. (DE)

A course in teaching research methods in an experimental child psychology course is described. (DE)

Describes a method in which the effect of impurity ions in the dielectric is taken into account in the operation of the Kerr cell. (Author/CP)

Describes a course designed to contribute directly to the teacher's ability to teach chemistry at the high school level with particular emphasis on planning and running a laboratory. Outlines the topics and occurrences in the course week by week. (GS)

By using a computer to simulate experimental situations, engineering laboratory courses can provide more ambitious experiments as well as experiments demanding more calculations. (SD)