Presents an experiment designed to give students some experience with photochemistry, electrochemistry, and basic theories about semiconductors. Uses a liquid-junction solar cell and illustrates some fundamental physical and chemical principles related to light and electricity interconversion as well as the properties of semiconductors. (JRH)

Presents a headspace gas chromatography experiment that enables discovery of the temperature dependence of the vapor pressure of a pure liquid. Illustrates liquid-vapor phase equilibrium of pure liquids. Contains 22 references. (JRH)

Presents an experiment designed to show students that the Henderson-Hasselbalch equation will fail when they use this particular one-half titration technique for acids with large pKa's. Involves determining the apparent pKa for such acids and using that to calculate the true pKa. (JRH)

Describes how a handful of institutions are experimenting with computer simulations to offer hard science labs through distance education. (EV)

Indicates the range of purposes and variety of settings in which design experiments have been conducted, delineating five crosscutting features that collectively differentiate design experiments from other methodologies. Clarifies what is involved in preparing for and carrying out a design experiment and in conducting a retrospective analysis of…

Explores how the emerging goals, approaches, and methodologies of design experiments might be productively combined with methods of inquiry common in more traditional laboratory science, considering the potential benefits of such a dialectic. Presents three examples of collaboration and describes steps toward productive exchange (identifying…

This study used event-related potentials (ERP) and visual preference technique to assess 6-month olds' ability to recognize their mothers' face. Results of five experiments suggested that infants can recognize their mothers' face, but the neural processes accompanying recognition depend on the difficulty with which mothers can be discriminated…

Presents methods commonly used for investigating enzyme activity using catalase and presents a new method for measuring catalase activity that is more reliable and accurate. Provides results that are readily reproduced and quantified. Can also be used for investigations of enzyme properties such as the effects of temperature, pH, inhibitors,…

Presents a protocol that uses reverse phase chromatography for the separation of chloroplast pigments. Provides a simple and relatively safe procedure for use in teaching laboratories. Discusses pigment extraction, chromatography, results, and advantages of the process. (JRH)

Presents an exercise that demonstrates how plants cope with multiple resource limitations in the field. Stimulates students to think about interactions among multiple limited resources and the challenges plants as immobile organisms face when characteristics that increase the capture of one resource negatively impact the availability of another.…

Presents science activities conducted with liquid nitrogen to demonstrate electricity, magnetism, and kinetic theory. (YDS)

Discusses clinical trials in general, protecting human research subjects, and the role the research administrator can play in facilitating the process. The discussion is not intended to be a thorough treatise on clinical trials, but is an overview of new and lesser known human protection issues that are better handled prospectively. (EV)

Describes a science laboratory on reproductive behavior and studies the dynamics in Lirceus, an aquatic crustacean of which the females evaluate the males' quality through mating contests. Explains collecting isopods and developing colonies in the lab environment. Investigates food deprivation, locomotor activity, and behavioral trials to…

Research anthropologists are using experimental ethnographic writing to reveal the kinds of hidden agenda that both researchers and informants bring to anthropological field work, questioning what constitutes truth in an ethnographic account. (MSE)

Teachers are provided with several experiments for primary students that address concepts related to the properties of air, sound, and water. (IAH)