Discusses topics on membrane electrodes corresponding to approximately six hours of lecture time. These include glass, liquid, crystal, gas-sensing membrane electrodes as well as enzyme and other bioselective membrane electrodes. Instructional strategies and other topics which might be discussed are provided. (JN)

Young children are naturally curious about their environment and learn best by exploring the world around them. Magnifiers, or hand lenses, are a valuable tool in this exploration. Discusses the selection, use, storage and costs of magnifiers. Includes suggestions of objects/phenomena to observe inside and outside of the classroom. (JN)

A linear photodiode array is used as the photodetector element in a new ultraviolet-visible detection system for high-performance liquid chromatography (HPLC). Using a computer network, the system processes eight different chromatographic signals simultaneously in real-time and acquires spectra manually/automatically. Applications in fast HPLC…

The absence of "hands-on" experiences with science equipment in schools stimulated the production of science kits for children. Thirty years later this enterprise has become a national institution in Brazil with a proud history of effecting change in the teaching of science throughout this country. (Author/JN)

An apparatus is described in which effects of pressure, volume, and temperature changes on a gas can be observed simultaneously. Includes use of the apparatus in demonstrating Boyle's, Gay-Lussac's, and Charles' Laws, attractive forces, Dalton's Law of Partial pressures, and in illustrating measurable vapor pressures of liquids and some solids.…

Citing several disadvantages in using traditional gold-leaf electroscopes in schools, a simple and easily constructed electroscope, suitable for both O- and A-level physics, is described. Information on adapting the electroscope to become a pulse electrometer is provided. Electroscope activities/demonstrations are also provided. (Author/JN)

Describes an apparatus used to demonstrate effects observed with polarized light. The apparatus employs two pendulums attached to threads crossing orthogonally over an overhead projector. Several demonstrations using the apparatus are provided. (Author/JN)

Describes advantages of using longer focal-length concave and convex cylindrical mirrors constructed from sheets of flexible, back-surfaced, mirrored acrylic plastic. Suggestions for several student experiments, along with typical experimental results, are also presented. (Author/JN)

Describes a model which gives realistic predictions of pulsatile pressure, flow, and volume events in the cardiovascular system. Includes computer oriented laboratory exercises for veterinary and graduate students; equations of the dynamic and algebraic models; and a flow chart for the cardiovascular teaching program. (JN)

Describes apparatus/methodology and provides background information for an experiment demonstrating electrochemical concepts and properties of electrochemical cells. The color of a solution close to an electrode is changed from that of the bulk solution to either of two contrasting colors depending on whether the reaction is oxidation or…

Describes a simple, inexpensive continuous culture apparatus (chemostat) and its applications in teaching biological concepts (growth-limiting factors and competition). Other suggested uses include experiments in enzyme induction, biosynthesis, and strain selection, and for student research projects. (JN)

Summarizes the twelfth AAPT Apparatus Competition held in New York in January 1981. Lists and briefly describes apparatus of individual award winners. (SK)

Membrane cells were developed as alternatives to mercury and diaphragm cells for the electrolysis of brine. Compares the three types of cells, focusing on the advantages and disadvantages of membrane cells. (JN)

A fast-flow discharge reactor has been used in an analytical chemistry demonstration of gas phase titration, in inorganic preparative chemistry, and in physical chemistry as a "practice" vacuum line, kinetic reactor, and spectroscopic source as well as an undergraduate research tool. (SK)

Computer applications in scientific instrumentation are traced from early data processing to modern computer-based instruments. Probable pathways toward instruments with increased "intelligence" include, among others, implementation of hierarchical computer networks and microprocessor controllers and the simplification of programing. The…