Discussed is the preparation of synthetic brochantite from solution and a thermogravimetric-differential thermal analysis study of the thermal decomposition of this compound. Other analyses included are chemical analysis and IR spectroscopy. Experimental procedures and results are presented. (CW)

Described is the derivation of the relationship between the pH measurement error and the resulting percentage error in hydrogen ion concentration including the use of variable activity coefficients. The relative influence of the ionic strength of the solution on the percentage error is shown. (CW)

Described is an activity in which the interactions between a parasite and its host may be demonstrated using the relationship between yogurt and two species of bacteria. Background information on Koch's postulates is provided. Materials, laboratory procedures, and results are discussed. (CW)

Outlined is a method for collecting and cutting oriented samples for microstructural analysis including handling the samples in the laboratory, cutting and orienting chips parallel to the motion plane, and cutting and orienting chips normal to Le and foliation. (CW)

The design and data management of an activity to study weathering by increasing the rate of mineral dissolution in a microwave oven is described. Data analysis in terms of parabolic and first-order kinetics is discussed. (CW)

Features of Crassulacean Acid Metabolism plants are presented. Investigations of a complex eco-physiological plant adaptation to the problems of growth in an arid environment are discussed. Materials and procedures for these investigations are described. (CW)

Presents teaching variations with a word-processing package and related tools that enable teachers to develop different computer-writing pedagogies for their distinct contexts: traditional classroom, computer lab, or some combination of both. Emphasizes that teachers who re-envision teaching with regard to available technology can create dynamic…

Uses four case studies to explore four areas in which computers affect the process of tutoring other writers: tutor-to-client dialogue; macrostructural revision; surface editing; and printing. Shows how the computer has some unexpected catalytic effects on human interactions. (MM)

Described is an investigation of the contributions of genes and environment to a quantitative character using readily available varieties of dwarf beans. Included are a list of materials, typical results, and a student instruction sheet. (CW)

A hands-on science lesson which allows young students to apply stains in the classroom and then try to remove them is presented. Included are a list of materials, procedures, and a discussion of probable results. (CW)

Described is an astronomy lesson designed to explore the relationship between the angle of the sun, the position of the north star, and the horizon line of a local area. Activities for teaching protractor fundamentals are included. (CW)

A survey of predoctoral pediatric dental programs gathered information about changes since 1980 in total and topic-area didactic curriculum hours, percentage of topic area material updated, and frequency of clinical procedures used. Results suggest significant change during that period. (MSE)

Describes laboratory procedures for observing the progressive change deciduous leaves undergo prior to abscission. Outlines the starch test, sugar test, extraction and chromatography of pigments, and experimental results. States that obtained results enable the events of leaf senescence to be correlated with the carbohydrate economy of a tree in…

Uses a study of a high school writing center program to illustrate and explain the different forms and skills needed for collaborative writing in both classroom and writing center contexts. (MM)

Describes how writing centers train their tutors to understand two important aspects of teaching composition: (1) the need for viewing writing as a process; and (2) the need for individualized and respectful attention to students' papers and ideas. Argues that the writing center is an effective training ground for composition teachers. (RS)