Outlines a multistep project involving oxidation of cholesterol, isomerization of an enone, and reduction of delta-4-cholesten-3-one. Featured is the last stage in which the ring junction is set stereospecifically. Recommends two laboratory periods to complete the reaction. (ML)

Describes a physical organic experiment in thermodynamics and kinetics for undergraduate courses in organic chemistry, biochemistry, or physical chemistry. Details background information, solution preparations, equipment and methods, and the suggested experiments such as determination of general-base-catalytic coefficients and the Bronsted…

Presents an analog of radioactive decay that allows the student to grasp the concept of half life and the exponential nature of the decay process. The analog is devised to use small, colored, plastic poker chips or counters. Provides the typical data and a graph which supports the analog. (YP)

Introduced is an inexpensive laboratory apparatus for first-year high school chemistry students. Presents information on materials, construction procedures, and activities for students. (YP)

Describes an experiment to be performed in an undergraduate biochemistry laboratory that is based on a gradient centrifugation system employing a simple bench top centrifuge, a freezer, and frozen surcose gradient solution to separate macromolecules and subcellular components. (CW)

Describes a kinetic and mechanistic investigation of ascorbic acid by a substitution-inert complex in acidic medium suitable for the undergraduate level. Discusses obtaining the second order rate constant for the rate determining step at a given temperature and comparison with the value predicted on the basis of the Marcus cross-relation. (CW)

Describes a laboratory experiment that is designed to aid in the understanding of the fundamental process involved in gas chromatographic separations. Introduces the Kovats retention index system for use by chemistry students to establish criteria for the optimal selection of gas chromatographic stationary phases. (TW)

Reviews a study that examined the effects of laboratories on the grade performance of undergraduates in an introductory crop science course. Results indicated that students enrolled in lecture and laboratory concurrently did not receive higher lecture grades than students enrolled solely in lecture, but did have higher laboratory grades. (ML)

Recounts the decision-making processes involved in the acquisition (or renovation) of a language laboratory for a small college. Of critical importance was the determination of how the laboratory would best be utilized as well as how it would operate. These decisions determined the best choice of equipment. (SL)

A general laboratory course should include projects that familiarize college students with the variety of methods available to the researcher. Described are four research projects that address questions about human behavior by means of experimental, observational, survey, and archival research methods. (RM)

Explains that the speech compressor/expander is a piece of electronic equipment useful in second language learning laboratories. Considering the relationship between technology and its use as an aid in achieving fluency in comprehension, the theory of rate alteration in second language learning is supported as a viable tool to enhance any…

In recent years, managing a vocational laboratory has become an increasingly difficult and complex task facing many vocational educators. Specialized instructional areas, diverse groups of students, and extended laboratory time have caused educators to seek alternate ways of providing practical "hands-on" instruction when traditional supervised…

The laboratory method has institutionalized itself in the larger social system, and an investigation of how this came about provides an important case study of social intervention. Uses of the method's intrinsic "change-agent" concept are illustrated, and particular aspects of the growth of the movement are examined. (Author)

This document provides information on the most commonly asked science safety questions by science teachers primarily at the secondary school level. Topics include the legal responsibilities of a science teacher, a general safety checklist, proper labeling and storing of chemicals, purchasing of new chemicals and disposing of old chemicals, a…

This study reports on the courses in biological sciences offered in public high schools, enrollments in the course in general biology, number of teachers of general biology, organization of the course, nature of the laboratory work, laboratory and supplementary facilities, the equipment used in teaching the course, appropriations for equipment and…