Presents problems appropriate for high school and college students that highlight dilution methods. Promotes an understanding of dilution methods in order to prevent the unnecessary waste of chemicals and glassware in biology laboratories. (JRH)

Presents an example of a take-home discovery-based activity that supplements the lecture component of a general chemistry course. Involves the student in chemistry exploration outside the class. Extends the context of content and experimentation into a nontraditional laboratory environment. Reports that students find the challenges useful in…

Presents experiments with lightsticks in which the activation energy for the light-producing reaction is determined. Involves monitoring the light intensity of the lightstick as a function of temperature. Gives students the opportunity to explore the concepts of kinetics and activation energies and the world of computer-interfaced experimentation…

Discusses revisions in general chemistry laboratory to include group project work. Describes evaluation techniques and sample projects. (MKR)

Explains the infection process of T-4 phage and provides the steps of experimentation on bacteriophages. Uses Escherichia coli and a virus mixture to observe phage infection. Points out the importance of safety and lists cultures, media, and disposable lab equipment for a group of students. (YDS)

Explores using corn seeds to demonstrate plant growth and development. This experiment allows students to formulate hypotheses, observe and record information, and practice mathematics. Presents background information, materials, procedures, and observations. (SAH)

Describes generations and experiences of an exhibition presented in Spring 1998 at the Oldenburg Museum of Natural History and Pre-History. Discusses the thematic leitmotiv of this exhibition which was to present experiments from the history of physics as a cultural activity. Describes how reconstructions of historical experimental set-ups were…

Explains the teaching opportunities, especially in science activities and laboratory experiments, of using technology in science classrooms. (YDS)

Describes a chemistry demonstration on freezing point depression wherein students investigate the effects of adding various substances to ice water. Includes instructor information and a student activity sheet. (YDS)

Presents a 10-hour chemistry experiment using copper sulfate that has three steps: (1) purification of an ore containing copper sulfate and insoluble basic copper sulfates; (2) determination of the number of water molecules in hydrated copper sulfate; and (3) recovery of metallic copper from copper sulfate. (Author/YDS)

Describes a student-centered laboratory course in which student teams select phage from sewage samples and characterize the phage in a semester-long project that models real-life scientific research. Results of student evaluations indicate a high level of satisfaction with the course. (Author/MM)

Describes an activity comparing incandescent bulbs and LEDs powered by dc and ac voltage sources to illustrate properties of matter and the interactions of energy and matter. Includes both instructor information and student activity sheet. (Author/YDS)

Explains a three week laboratory experiment on the gel separation of peroxidase, which is the most well-known isozyme, from beans. Includes suggestions on the laboratory management. (Contains 13 references.) (YDS)

Explains how to use galvanotaxis and mutagenesis experiments to study Paramecium's swimming behaviors and ion channel functions. (YDS)

Describes a molecular biology laboratory in which students study the role of the enzyme polygalacturonase in the softening of tomatoes during ripening by developing their own hypotheses and designing their own experiments. (MM)