Describes a biochemistry class project which allows students to investigate independently the separate aspects of a common complex problem. The basic experimental procedure is detailed for obtaining information about the structure and geometry of L-ornithine carbamoyltransferase. (CS)

Presents materials and procedures for a lecture demonstration in which liquid nitrogen or liquid oxygen is poured between the poles of a powerful magnet. Hazards of these procedures are included in the discussion. (CS)

Describes a two-part energy unit for gifted fifth and sixth graders. Students conduct energy use/waste surveys and participate in a simulation game concerning a particular environmental/energy problem. (SJL)

Presents demonstrations, using microprocessors, to show the slow change in relative phase of two sine waves feeding the inputs of an oscilloscope and Fourier synthesis. (SK)

Presents some creative ideas that a high school chemistry teacher uses to stimulate right-brained activities in a chemistry classroom. (CS)

Reported are previsit, during visit and postvisit activities for a class zoo trip. A list of basic zoo manners and a zoo visit checklist of ideas for students are also included. (DS)

This is the second of a series of three seasonal environmental learning stations that create a land lab on the elementary school grounds. Graded science activities for 10 learning stations are outlined. For the first article in this series, see the September 1980 issue of this magazine. (Editor/SJL)

Discusses several of the plant responses to the environment and ways that these responses can be demonstrated. Includes phytochrome-controlled growth, phototropism, and geotropism. (CS)

Describes procedures for monitoring students' responses in heart rate to various stimuli by the use of an electronic monitoring device strapped to the wrist. (CS)

Describes experiments which demonstrate how different diets affect the growth rate of earthworms. Procedures for feeding baby worms are outlined, the analysis of results are discussed, and various modifications of the exercise are provided. (CS)

Describes a simple activity using modeling clay to help biology students better understand the relationships between longitudinal, serial or cross-sections, and the entire structure from which the sections were made. (Author/SK)

Recommendations are made for handling and growth of Beneckea natriegens, a rapidly growing, nonpathogenic marine bacterium which can be used with advantage to replace Escherichia coli in many undergraduate microbiology experiments. Examples of experiments and the potential value of this organism as a subject for student research projects are…

Presents two demonstrations for classroom use related to precipitation of ferrous hydroxide and to variation of vapor pressure with temperature. The former demonstration is simple and useful when discussing solubility of ionic compounds electrode potential of transition elements, and mixed valence compounds. (Author/SA)

Moh's scale for determining the hardness of substances is explained. Four classroom exercises are suggested. (MK)

Discusses methods and exercises appropriate for use in a secondary school chemistry classroom to enhance mastery of skills in these three areas: communication, mathematics, and problem solving. (CS)