Describes two models of interaction between the writing center and entire classes (required attendance and tutor assignments) which led to practical, pedagogical, and philosophical problems. Describes a peer group critique model which overcomes such problems and helps large numbers of students learn the value of discussing ideas and drafts with…

Described is a laboratory exercise designed to introduce students to the theory and practice of gene mapping including RNA extraction, sucrose density gradient centrifugation, labelling of nucleic acids in vitro, DNA extraction, digestion of DNA with restriction enzymes, and the southern hybridization analysis. Procedures and sample results are…

Presented are system concepts with examples of various vendor approaches for implementing laboratory local area networks. (CW)

Common notions about what college writing centers are and do are examined so that faculty and students may understand how to make the best use of them. Issues discussed include their organizational status and role, audience, and specific functions and activities. The structure and objectives of tutoring sessions is briefly addressed. (MSE)

Described is the use of ordinary ceramic magnets to replace the more expensive bar magnets commonly used. Suggestions for 11 task cards to help introduce children to the uses and principles of magnetism are provided. (CW)

Presented is a laboratory exercise designed to demonstrate the effects of moisture on hay preservation products in a manner that does not require large amounts of equipment or instructor time. Materials, procedures, and probable results are discussed. (CW)

The Moire pattern is the shimmering pattern which looks like an odd interference pattern in window screens or folds of nylon shower curtain. Illustrates some of the ways the effect may be used, including demonstration of wave interference, detection of small displacement, persistence of vision, contour measurement, beats, and optical clearness.…

Discussed are applications of robotics in the chemistry laboratory. Highlighted are issues of precision, accuracy, and system integration. Emphasized are the potential benefits of the use of robots to automate laboratory procedures. (CW)

Presented is an activity that uses ground ivy to display different growth forms under different light intensities. Specimen preparation, materials, procedures, and probable results are discussed. Examples of graphs of the data are provided. (CW)

Describes a demonstration that shows the absorption spectrum of chlorophyll. Uses an overhead projector, a solution of chlorophyll, and a diffraction grating. (RT)

Outlined is a procedure for the assessment of fungal growth under different cultural conditions, together with a demonstration of the toxic nature of exudates released from a fungal pathogen during growth in culture, using a simple bioassay. (Author/CW)

A study surveyed noise levels in an agricultural mechanics educational laboratory while students completed common arc welds. It found that the time a student spent in the welding booth posed no threat to hearing. Maximum noise measured was well below the 140 dB(A) impulse level set by the Occupational Safety and Health Administration. (JOW)

Described is a third-grade science unit using feathers. Children use the feathers to learn about measurement, observation, and inference. Procedures and results are discussed. (CW)

Provides an overview of a graduate course on particulate processes, especially on crystal size distribution (CSD). Describes the course and includes a list of course topics. Discusses the CSD simulation and manipulation. (YP)

Describes ways to use nomographs, including solving equations for equivalent resistance of a parallel circuit, focal length of a thin lens, parallel combinations of standard resistance, average speed, refraction problem, and height of a vertically projected object. (YP)