Described is an experiment which uses an autotrophic bacterium to anaerobically oxidize hydrogen sulfide to sulfate in a batch-stirred tank reactor. Discusses background information, experimental procedure, and sample results of this activity. (CW)

Describes the theory and application of an atomic fountain which pushes the atoms by laser pulses. Discusses the applications in measuring atomic properties and in building an atomic clock. (YP)

Proposes a simple procedure based on an expansion of the exponential terms of Raoult's law by applying it to the case of the benzene-toluene mixture. The results with experimental values are presented as a table. (YP)

Described is a simple demonstration of fermentation. The materials needed, the basic experimental set-up, and various projects are outlined. Included are a diagram of an apparatus for measuring carbon dioxide production and a table showing typical results of the effect of pH on fermentation. (RT)

Suggests caregivers can help children learn about the concept of light using simple conversation and activities. Offers directions for activities in which children can consider the following questions about light: where does light come from?; can you see without light?; what blocks light?; how does light travel?; can you make a shadow?; and does…

Describes an experiment designed to disprove the belief that an electrical field originating from a point inside a closed conducting surface cannot produce an electric field outside this surface. (ZWH)

Describes an experiment to study the motion of a rocket-propelled vehicle over the entire duration of the engine burn using a video system with a frame-by-frame playback and a Sonic Ranger for ultrasonic position movements. Enables students to study the impulse-momentum principle and the effects of a time-varying force. (JRH)

Presents a series of investigations focusing on the biodegradable packing materials ("peanuts"), which provide a method for exploring science through experimentation. These activities can help fourth through sixth graders sharpen their critical thinking and science process skills. (PR)

Describes the involvement of students in the construction of an inexpensive wooden balance to aid in their understanding of mass. (ZWH)

Describes the Iowa General Chemistry Network that was developed to change content, teaching, and learning methods of introductory college chemistry courses. Highlights include using the Iowa Communications Network for distance education and curriculum reform, using the Internet and World Wide Web, and chemistry laboratory experiences and…

Uses common equipment (tea kettle and vacuum bottles) to precisely measure the specific heat, latent heat of fusion, and latent heat of vaporization of water. Provides descriptions for all three experiments. (MVL)

Students construct a Sierpinski gasket from resistors and measure its resistance as a function of size. Provides a brief review of what it means geometrically for the Sierpinski gasket to be fractal, followed by an explanation of how to analyze the electrical resistance on a gasket to find its fractal behavior. (MVL)

Describes content and conduct of a course that deals with animal use. Exposes students to a variety of perspectives from extreme to moderate concerning uses and abuses of animals. Appendix lists resources for animal uses and abuses seminar. (JRH)

This article describes a simple and rapid method for using summer squash to investigate born deficiency in plants. Author asserts that students are likely to feel challenged by laboratory exercises and projects that focus on the role boron plays in plant growth because it is an unresolved problem in biology. (PR)