Provides procedures, apparatus, and pre- and postlaboratory questions for an inexpensive, unsophosticated experiment that determines the approximate value for Avogadro's number. (CS)

Describes a student field project involving the estimation of a maximum rate of erosion for a local area. Identifies the factors influencing erosion and outlines the method of investigation. (GS)

The literature on crowding in residential and laboratory settings is reviewed, and a model of crowding highlighting the importance of perceived control and group orientation is discussed. (EF)

An experiment is described that was developed for a course in Inorganic and Analytical Pharmaceutical Chemistry at Rutgers University to provide pharmacy students with practical experience in the thin-layer chromatography used for the analysis of urine to monitor patient compliance with drug abuse treatment programs. (JMD)

Describes a student investigation of a reverse flame in a atmosphere of methane that won second place in the physics division of the International Science and Engineering Fair. Includes a discussion of falling and fracturing behavior, specifically dealing with chimneys, trees, pencil point, stirring rods, and chalk. (BT)

The Laboratory of Comparative Human Cognition has found that, if cross-cultural psychology has mounted a challenge to developmental psychology, it is because it has forced recognition of the fact that no context of observation, including the laboratory, is culturally neutral. Settings for behavior are embedded in larger systems of social…

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)

Describes how a sample of iodine-131-labelled tin (IV) iodide can be used to estimate the mass of tin (IV) iodide present in a mixture with sodium chloride, by isotope dilution analysis. (MLH)

Discusses the negative reactions to the Food & Drug Administration's proposed good laboratory practices for nonclinical laboratory practices. Industry representatives protest the inflexibility and excessive detail in the regulations. (MLH)

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…

Selected time components of the cardiac cycle were determined during breathing in air, breathing through a snorkel during face immersion, apnea in air, and apnea during face immersion. (PBS)

Describes an experiment designed to determine ascorbic acid concentrations in natural orange juice. The experiment is used with undergraduate pharmacy students to allow understanding of the principles of operation of the coulometer and polarograph. (DDR)

Presents a laboratory investigation to demonstrate that habitat structure promotes increased organism abundance and species diversity by reducing predator effects on prey abundance. Investigates the effects of goldfish (Carassius auratus) predators on Gammarus sp. (an amphipod) and Daphnia magna (a cladoceran) prey in the absence and presence of a…

Examines the nature of an ideal K-12 environmental science curriculum. Evaluates major biology textbooks with regard to ecology readings and laboratory activities in each text. (YDS)