Explores the structural behavior of polyenic pi systems such as isomerization and conjugation. Uses the simultaneous spectrophotometric analysis of a beta-carotene and lycopene mixture. Presents an empirical method to determine the number of double bonds in the polyenic carotenoid. (MVL)

Discusses electron spin resonance, a form of magnetic resonance spectroscopy, used to study electronic structure of molecules with unpaired electrons. Studies benzosemiquinone radical anions which are long-lived and inexpensive. Uses a Project SERAPHIM computer program to perform a Huckel molecular orbital calculation. (MVL)

Describes a chemistry software program that emulates a modern binary gradient HPLC system with reversed phase column behavior. Allows for solvent selection, adjustment of gradient program, column selection, detectory selection, handling of computer sample data, and sample preparation. (MVL)

Lists five module objectives and discusses the overall need for the modules. Indicates each module is preceded by a statement of the problem and objectives are aimed specifically at the anticipation and reduction of potential hazards. Offers examples of modules on fume hoods and on disposal of waste. (MVL)

Provided is a unit which relates the fulcrum of a lever system and the mean of a distribution of scores. The objective, rationale, two student laboratories, and an evaluation system are outlined. Content background on statistics is offered. (MVL)

Explains a science project conducted by the Boston Museum of Science to provide enrichment activities through an interaction between children and scientists. Provides information on the packets of creative problem-solving experiences, a description of the program, the culminating event, and joining procedures. (RT)

Describes a program for students or science teachers to integrate demonstrations into the science curriculum. Uses the idea of a chemical genie with numerous demonstrations to illustrate that science can be fun, to learn some indicators of a chemical reaction, and to discover factors that affect reaction rates. (MVL)

Describes a lab exercise used to demonstrate the measurement of biomass in a three layered forest. Discusses sampling, estimation methods, and the analysis of results. Presents an example of a summary sheet for this activity. (CW)

Follows an experimental program where 30 trained high school science teachers used 6 to 10 students each to produce an original experimental environmental research project. Offers suggestions to improve science in high schools. Lists methodology of several of the projects and describes others. (ML)

Suggests seven take-home experiments geared toward the topic of energy that can be utilized in large, general-education physics classes that do not include laboratory sessions. An appendix provides details for the experiment to measure the heat of fusion of water. (MDH)

Discusses traditional school demonstrations and experiments in hydrotropism. Explains that these experiments seem to "prove" hydrotropism, but yet most botanists reject hydrotropism. Teachers continue to teach the concept because it is logical and the experiments are simple. (PR)

Presents activities that utilize piezoelectric film to familiarize students with fundamental principles of electricity. Describes classroom projects involving chemical sensors, microbalances, microphones, switches, infrared sensors, and power generation. (MDH)

Describes the use of Gowin's Vee to make the connection between lecture and laboratory, guide science fair research, help students decipher professional research journals, and make oral science fair or lab report presentations easier to understand. Provides examples of Gowin's Vee applied to research articles and comprehensive criteria for…

Explains how the surface of a freshly sliced potato can be used for a variety of enzyme action experiments including the influence of pH on enzyme action, the enzyme denaturation potential of boiling water, the inhibition of enzymes by heavy metals, and the effects of salt concentration on enzyme effectiveness. (PR)