Discusses the mechanism and the change of pH during the reaction. Notes that a dramatic rise in pH occurs when the reaction nears completion. Evaluates theories by other authors. (MVL)

Explained is a representation of the three categories of spectra. Discusses what a lesson on spectra should include, background information, and equipment needed. Provided is a diagram of an absorption box. (RT)

Surveys freshman English directors in order to help define the role of the writing center director. Discusses how writing center directors are viewed within English departments. Appends the questionnaire used. (MS)

Describes a combined field and laboratory exercise suitable for teaching concepts of tillering and yield component compensation which is adapted to climatic conditions where extensive class fieldwork is not possible. Provides information on materials and methods, pedagogical aspects, evaluation, and conclusions. (Author/RT)

Describes theory and principles behind biosensors that incorporate biological components as part of a sensor or probe. Projects major applications in medicine and veterinary medicine, biotechnology, food and agriculture, environmental studies, and the military. Surveys current use of biosensors. (ML)

Presents an algorithm for solving problems related to multiple allelic frequencies in populations at equilibrium. Considers sample problems and provides their solution using this tabular algorithm. (CW)

This article presents a variety of topics discussed in this column and at a biology teachers' workshop concerning the quality and value of lab techniques used for teaching high school biology. Topics included are Drosophila salivary glands, sea urchins, innovations, dyes and networking. (CW)

Provided are background information, equipment lists, and procedures for four activities for teaching aquatic ecology. Activities include "The Aquatic Food Chain Game"; "Two-Liter Aqua-Vivariums"; "A Sealed World"; and "Weaving a Web: Evaluation." (CW)

Contains articles on digestive enzymes in grasshoppers; bird and badger observation; reactions between hydrochloric acid and sodium carbonate solutions; observing the migration of ions; pupil's heating skills (Bunsen burners); photolysis experimentation; capillary kinetics; experience with trireme; connection circuits; special relativity; a…

Five articles describe improvements in instructional software designed to enhance problem solving skills. Issues addressed include problem solving software to implement curriculum goals; problem solving theory and writing theory; software for elementary and secondary school science instruction; software for mathematics instruction; and cognitive…

A model for introducing English-as-a-Second-Language learners to the language laboratory component of a modern "Language Acquisition Resource Center" (LARC) at a metropolitan university is presented. Emphasis is on audio materials, but many of the LARC suggestions are applicable to video and computerized materials as well. (Contains 16…

Indiana University's Teacher Education Laboratory replaces and supplements portions of the preservice program previously provided through field placements in area schools. This article describes the initial field test of a laboratory experience for secondary education majors. Surveys rating students' attitudes about the experience indicated…

A computer-based replacement for an electronics laboratory experiment was created and tested on second-year undergraduate students in the Department of Mechanical Engineering at the University of Southampton (England). Responses, assessed by questionnaire, showed that computer-assisted learning techniques provide a viable means for teaching…

Describes a project to develop and conduct an assessment that was congruent with the hands-on, process-oriented science education used in an Illinois school district. The approach used observations, group-teacher interactions, group performance, and data gathering and interpretation. The major components of the program are summarized. (PR)

Describes techniques and equipment which allows school microscopes to perform crossed-polarized light microscopy, reflected light microscopy, and photomicrography. Provides information on using chemicals from a high school stockroom to view crystals, viewing integrated circuits, and capturing images on film. Lists possible independent student…