Discusses the possibilities of toxins present in medicinal herbs. Describes an experiment in which toxic constituents can be selectively detected by thin-layer chromatography and NMR spectroscopy. (TW)

Reviews studies focusing on practical assessment in science. Areas considered include what students are really doing in laboratories, how practical skills should be assessed, methods used to assess practical science (such as internal/external examinations and continuous assessment), methodological issues, and reasons for the failure of some…

Presents observations about grading resulting from discussions between a writing instructor and teaching assistants working in a writing lab. Offers suggestions for grading writing and for getting students to edit their work. (HTH)

The author describes the application of the vocational method of instruction, a technique focusing on real-world laboratory settings and private sector involvement, to the programs of an academic high school, Thomas Jefferson High School for Science and Technology in Fairfax County, Virginia. (CH)

Explains the use of an accelerometer in investigations confirming Newton's second law. Provides diagrams and descriptions of the apparatus. (ML)

A course to familiarize medical students with the principles of good medical research study design and analysis focuses on three types of studies: clinical trials, laboratory science, and epidemiology and biostatistics. (MSE)

Describes reasons for developing combined text and computer assisted instruction (CAI) teaching programs for delivery of continuing education to laboratory professionals, and mechanisms used for developing a CAI program on method evaluation in the clinical laboratory. Results of an evaluation of the software's cost effectiveness and instructional…

Reviews the main principles of interfacing and discusses the software developed to perform kinetic data capture and analysis with a BBC microcomputer linked to a recording spectrophotometer. Focuses on the steps in software development. Includes results of a lactate dehydrogenase assay. (ML)

Analyzes three approaches (physical, mental, combined practice) to improving freshman chemistry psychomotor laboratory skills. Although no significant differences were found between treatments, there were significant differences when each was compared to the control sections. Mental practice appears to offer an efficient methods for reinforcement…

As a form of warning to educators who might mistake novelty for value, a nationally recognized expert compares the present influx of microcomputers into academia, with similar and now historic moves by motion pictures, educational radio and television, language laboratories, and teaching machines. (JN)

A class of preservice teachers was divided into teams to research geometry, measurement, probability, and statistics topics and ascertain ways each can be taught to children. Activities are set up so other students can work with them. References and materials are listed. (MNS)

Proposes an analog circuit for use in sedimentation analysis of finely divided solid materials. Discusses a method of particle size distribution analysis and provides schematics of the circuit with list of components as well as a discussion about the operation of the circuit. (JM)

Discusses two factors to consider when initiating advanced placement (AP) chemistry, namely, the quality of those teaching the program and the time necessary to teach the relevant concepts. Suggests offering laboratory sessions during evening hours as an alternative to traditional daytime arrangements for laboratory blocks. (JN)

An organic chemistry laboratory has been designed around independent laboratory projects that are done by groups, thus exposing students not only to a research experience but also to one that is more realistic and like the one they will be in as professional chemistry chemists. Instructional strategies used are described. (JN)

Discusses new solid-state transducers, arrays of nonspecific detectors, hardware and firmware computational elements, and other devices that are transforming modern analytical chemistry. Examples in which microelectroic sensors are used to solve 14 problems are included. (JN)