Describes a method for in vitro culturing of cells from amphibian early embryos. Such cells can be used to demonstrate such properties of eukaryote cells as cell motility, adhesion, differentiation, and cell sorting into tissues. The technique may be extended to investigate other factors. (Author/JN)

Examines the treatment of errors and significant figures in physics manuals as part of an evaluation of these instructional materials. Comments on specific materials reviewed are provided. (JN)

The tendency of a poured liquid to cling to the outside of a container is known as the "teapot effect." The nature of the teapot effect and experiments investigating this phenomenon are described. (JN)

Describes a senior-level experiment dealing with the synthesis and characterization of a perovskite. Since most perovskites are cubic, their characterization by x-ray diffraction is simplified. In addition, magnetic ordering may be observed and the effects of a Jahn-Teller distortion seen. (JN)

Describes a new, modified "flash chromatography" apparatus which overcomes difficulties found in conventional apparatus. For example, an expensive teflon pressure valve is not necessary in the modified version. The apparatus is suitable as an instructional tool in undergraduate courses. (JN)

A simple method of studying thyroxine-induced resorption of tadpole tails in vitro is described. This procedure demonstrates that resorption is dependent on thyroxine and requires protein synthesis. It introduces students to the use of tissue culture methods. (Author)

A laboratory course design to teach the principles of process data acquisition and control using digital computers was developed at Washington University. The structure of the laboratory and course are described. The course outline and list of experiments are included. (JN)

Background information, procedures, and typical results are provided for an experiment on the decomposition of murexide in acid solution. The experiment, suitable for advanced courses, can be easily performed in a 6-hour laboratory period. (JN)

An experiment for determining polychlorinated biphenyl (PCB) isomers is described. The very low vapor pressures of PCB's allow them to be handled safely in the laboratory. In addition, this low volatility permits their analysis by thin-layer chromatography and recovery from the developed plate with effectively no evaporative losses. (JN)

Describes the preparation of two radical systems that are stable at ambient temperatures and give reproducibly well-resolved spectra without careful control of temperature or vacuum line degassing of oxygen. (MLH)

Describes the theory, apparatus, and procedure for an experiment that measures the bimolecular quenching constant for the deactivation of an excited ruthenium ion complex using dissolved oxygen. (MLH)

Describes an experiment in which the reaction rate and equilibrium constant are obtained for the fumarase-catalyzed interconversion of fumaric acid and L-malic acid. (MLH)

Reports on a series of four experiments designed to study the importance of the variables of task structure and method of expectancy inducement in effecting systematic observer bias. (Author/RK)

In a series of three experiments on the role of memory in solving attribute-identification problems, the subjects did or did not have to remember their response and/or the stimulus for processing during any given intertrial interval. (Editor)

Investigates the relative importance that the eyes and mouth play in the representation in memory of a human face. Systematically applies two kinds of transformation--masking the eyes or the mouths on photographs of faces--and observes the effects on recognition. (Author/RK)