Describes an experiment where equal parts of copper and aluminum are heated then cooled to show extremely large crystals. Suggestions are given for changing the orientation of crystals by varying cooling rates. Students are more receptive to concepts of microstructure after seeing this experiment. (DH)

In psychology, experimental studies are susceptible to the biases of the investigator in problem formulation, operationalization, sample selection, and data interpretation. Thus, what we regard as an objective, value-free approach to science is neither unbiased nor value-free. (GC)

Describes a set of laboratory experiments designed for a chemistry course revised for non-chemistry students. (MLH)

Describes an instrumental analysis experiment that utilizes spectrofluorimetry to determine as little as 0.02 percent glycine in commercial dietetic beverages. (MLH)

Describes the theory and performance of a diffusion experiment based on the free boundary method. Suitable for biochemistry and microbiology students taking physical chemistry. (MLH)

Describes a set of laboratory experiments that illustrate proteolytic enzyme action and specific properties of bromolain, including some insights into the active site mechanism of peptide hydrolysis. (MLH)

Describes two laboratory experiments involving metal ions and porphyrin ligands. (MLH)

Describes a technique by which room temperature phosphorescence of simple organic molecules can be demonstrated in the lecture hall or laboratory. (MLH)

Presents a kinetic study that utilizes a method for varying the concentrations of the possible Ce(IV) species and computing the concentration distribution of the sulfato and hydroxo species of Ce(IV). (MLH)

Describes several spectral experiments utilizing nuphthalene derivatives that display room-temperature phospharescence. (MLH)

Discusses research strategies employed in studies of the importance of adult social cues in controlling children's behavior, illustrating some of the limitations of sole reliance on laboratory paradigms for achieving an understanding of both the contemporaneous operation and the development of social cue effectiveness. (JH)

Tests the hypothesis that the effectiveness of discriminative stimuli as reinforcers is a function of the magnitude of the difference between them. (Author/RK)

Describes an experiment that illustrates the following points concerning the experimental determination of trypsin activity: (1) there is a difference in basing enzyme concentration on weight, absorbance, or active sites; and (2) the method of expressing enzyme concentration determines the value of specific, molecular, and catalytic center…

Describes an experiment in which the technique of ph-controlled extractive separation is used to separate a mixture of drugs aspirin (acidic), caffeine (basic), and phenacetin (neutral). (MLH)

Described is a physics experiment which investigates the reactions occurring when a hot dog is fried or broiled. (SL)