Discusses the advantages of conference teaching in writing labs. Provides several guidelines for conducting a teacher-student conference. (MM)

Dental faculty responses (N=332) to a survey concerning use of rubber dams for excluding fluids from the working field in operative dentistry procedures indicated students receive adequate instruction in rubber dam use and are proficient at graduation, though motivating students to its use is problematic and patient resistance a factor. (MSE)

The Grignard reagent used in the laboratory synthesis of organic compounds is the product resulting from the reaction of an alkyl or aryl halide with elemental magnesium. Describes the structure, formation, and some reactions of the reagent. (YP)

Described is an activity in which students are able to determine that DNA can be transferred between bacteria and should be able to predict the type of DNA transferred. Methods, materials, and results are discussed. (CW)

This article describes how pasteurized milk can act as a growth medium for bacteria and provide an ecosystem for scientific inquiry. Included are objectives, materials, procedures, questions and a discussion of expected results. (CW)

Discusses a demonstration of vertical collision of two balls. Shows the theoretical height ratio using mathematical expression and diagrams. Compares it with researchers' experimental results. Expands the two-ball collision to multi-ball system. (YP)

Comparison of the social behaviors of intellectually gifted and typical three-to five-year-olds in a university laboratory school found no difference in the two groups on a social development scale, but found that gifted children exhibited cooperative play to a much greater extent. (MSE)

Provides historical background, descriptions, uses and basis for identification of diatoms. Explains collection, dry-mount cleaning, and preparation procedures of the algae. Cites additional resources. (RT)

Describes a factorial experiment that is used as a laboratory exercise in a research methods course. Uses a Howard-Dolman depth perception apparatus, combining the factors of viewing condition and rod orientation to illustrate the nature of an interaction and the necessity of an additional analysis of simple main effects. (Author/LS)

Describes an innovative science program that trains teachers to use their own schoolyards as environmental laboratories. (MKR)

Describes the function of the various parts of the microscope and their integration in the formation of an optical image. Presents a procedure for setting up a microscope to obtain maximum resolution and contrast for each objective lens at all magnifications. (JRH)

Presents laboratory activities focusing on the development of sexually mature gametophytes from single-celled spores. Includes techniques for culture and manipulation of gametophyte development from spores that are applicable for hands-on activities for students at all levels. (MKR)

Traces the origins and development of writing centers. States that a reasonably solid history can be seen beginning in the early 1970s and earlier. Provides a definition of the features found in writing labs. Describes a program founded in World War II designed by the Armed Forces to teach officers two years of English in two semesters. (PA)

States that, at first glance, it is difficult to find two writing programs that seem to work better together than Writing across the Curriculum (WAC) and writing centers. Proposes, however, that the nature of the relationship between these two programs be reconsidered because their underlying epistemologies and textual features remain strikingly…