Presented is a cytogenic technique which enables students to produce preparations of dividing cells. Described are materials, methods, typical results, and assessment for this activity. The usefulness for a wide range of ages and abilities is stressed. (CW)

Discusses specific problems (arising in the context of a writing center visit) that writing assignments have caused students. Considers problems in teachers communicating objectives with students, unspecific teacher comments on students' papers, lack of examples for the writing assignment, overemphasis on grammatical correctness, unspecified…

Describes various configurations of computer equipment that can be used in public schools. Labs with multiple computers, one computer in a classroom, and minilabs (with three or four computers on a mobile cart) are compared for cost effectiveness, cooperative learning possibilities, instructional effectiveness, usage, security, and flexibility.…

A personal account of the events leading up to the realization that this was a bona fide species is presented. The application of the scientific method in the process of this research is emphasized. (CW)

Described are the design, construction, and uses of two pieces of laboratory equipment. Included are a multipurpose meter, "Calo-pH Meter," and a device for collecting water samples for determining dissolved oxygen content. (CW)

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)