Describes the following: use and construction of a lens-pinhole spatial filter assembly to produce expanded beams; how to modify a unilab V. L. F. oscillator to give variable frequencies between .1 Hz and 10 Hz; to use Crookes radiometer quantitatively; and an externally located, movable probe for plasma physics experiments, using conventional…

Amylose azure can be used as a chromogenic substrate for alpha-amylase in studying the effects of temperature and pH enzyme action. This is a model system which students can use to measure the energy of activation using the Arrhenius plot. (Author/BB)

Describes undergraduate chemistry curricula in which the student is asked to either build a model of one asymmetric unit in the unit cell and to indicate the positions of the symmetry-related units by putting in key atoms, or to identify on a prebuild model the asymetric and symmetry-related units. (BB)

An inexpensive DNA preparation is presented which starts with commercially available frozen packed bacterial cells. Methods for analyzing the DNA are also presented, along with physical chemical experiments which can be done using the purified DNA. (BB)

Describes an experiment for the intermediate undergraduate optics laboratory designed to illustrate simultaneously some aspects of the phenomena of diffraction; interference, coherence, apodization, the Fresnel-Arago law; as well as of the interrelations between these concepts. (HM)

Examines the problem of sex discrimination and sex-role stereotyping with respect to instruction in undergraduate science laboratory classes. Deals specifically with the behavior of instructors as they interact with students during laboratory sessions. A significant difference in male and female teacher behavior was found in three basic areas.…

This study developed and validated an inventory to measure students' attitudes toward and interest in laboratory work in high school chemistry. Factor analysis provided some evidence that interest in and attitude towards laboratory work in high school chemistry is not unidimensional, as it has been assumed to be. (BT)

Noting the lack of time in the 2-year program and the impatience of most student technicians, the author suggests that physics should be taught inductively. Laboratory experiments with understanding of the underlying physics principles are suggested as the appropriate center of activity. Examples are given of this emphasis on experimentation as…

A learning library based on individualized instruction that technical teachers can put together is described. It requires not only teaching skills but a knowledge of systems engineering, graphic arts, TV programing, and other skills allied to TV and broadcasting. (Author/BP)

Describes how to construct a moving reference frame for the quantitative measurement of the Coriolis effect. (MLH)

Suggests and describes laboratory activities in which the Mexican axolotl (Ambystoma mexicanum Shaw) is used, including experiments in embryology and early development, growth and regeneration, neoteny and metamorphosis, genetics and coloration, anatomy and physiology, and behavior. Discusses care and maintenance of animals. (CS)

A brief historical account of the initiation and development of the Group Dynamics Laboratory Class at Indiana State University is presented, with the intent of helping other teachers evaluate their own laboratory offerings, or aiding the reader in initiating a similar course in his or her own institution. (MB)

Diagrams a quick, improvised cardboard circuitry for battery holder, bulb socket, and switches. Materials include corrugated cardboard, paper clips, and rubber bands. Assembly useful in determining the electrical conductivity of substances. (CS)

Describes an apparatus that can be used to prepare air-sensitive or water-sensitive samples for melting point determinations. (MLH)

Details life cycles and descriptions of the major aquatic insects. Instructions for collection and maintenance of live organisms are included. (CS)