Describes the Tardigrada as a group of animals suitable for close study in project work. Gives reasons for their suitability and an illustrated identification key. Discusses possible investigations into the ecology and physiology of tardigrades. (Author/CW)

Provides guidelines for translating university science laboratories into middle school science activities. The need for guidelines is based on the authors' discovery that teachers teach what they were taught. Discusses six expected outcomes of middle school science activities: developing science concepts; practicing process skills; quantitative…

Outlines a laboratory exercise that makes use of Beer's Law plots of cysteine constructed at several pH values over a broad range of wavelengths to estimate the tautomeric ratio (R) of two singly charged ionic forms, calculate the microscopic constants, and construct ultraviolet spectra for both light absorbing species. (CW)

Introduced is a notation to map out an experiment as an active process in a real-world environment and display the human aspect written out of most narratives. Comparing maps of accounts can show how knowledge-construction depends on narrative reconstruction. Emphasized are nonverbal and procedural aspects of discovery and invention. (KR)

Describes an experiment for undergraduate chemistry laboratories involving a chemical found in plants and some sea animals. Discusses collection and identification of material, a hemolysis test, preparation of blood-coated agar plates, and application of samples. (CW)

Describes a demonstration procedure using controlled reduction potentials to predict observed color changes which are then experimentally verified. Demonstrates the usefulness of this procedure in helping students understand LeChatelier's principle and the solubilit rule "like dissolves like." (CW)

Describes experiments in which students prepare in situ soluble complexes of metal ions with different ligands and observe and estimate the change in formal potential that the ion undergoes upon complexation. Discusses student formation and analysis of soluble complexes of two different metal ions with the same ligand. (CW)

Describes a laboratory exercise in which acid dissociation constants and molecular weights are extracted from sample data and the sample is identified. Emphasizes accurate volumetric work while bringing to practice the concepts of acid-base equilibria, activity coefficients, and thermodynamic constants. (CW)

Describes an application of potentiometry to the determination of acidic and basic compounds in household cleaners in chemistry instruction. Discusses procedures and results of this experiment. (CW)

Described is a study which was developed to find the proportion of cross-dominance in young adults. Procedures and statistical tests are discussed. The tasks used in the assessment of cross-dominance are described. Results indicated that all persons suffered from some cross-dominance. (CW)

Chromium(VI) compounds are classified as oxidizers and must be specially packaged and transported for disposal while Cr(III) compounds are considered nonoxidizers. A process which reduces Cr(VI) to Cr(III) by adding sodium metabisulfite followed by neutralization with magnesium hydroxide is explored. (MVL)

Describes an experiment to be performed in an undergraduate biochemistry laboratory that is based on a gradient centrifugation system employing a simple bench top centrifuge, a freezer, and frozen surcose gradient solution to separate macromolecules and subcellular components. (CW)

Describes a kinetic and mechanistic investigation of ascorbic acid by a substitution-inert complex in acidic medium suitable for the undergraduate level. Discusses obtaining the second order rate constant for the rate determining step at a given temperature and comparison with the value predicted on the basis of the Marcus cross-relation. (CW)

Radiolabelled pesticides are used: in studies involving improved formulations of pesticides, to assist in developing standard residue analytical methodology, and in obtaining metabolism data to support registration of pesticides. This manual is designed to give the scientist involved in pesticide research the basic terms and principles for…

Describes eight experiments involving the use of common consumer products that could be incorporated into quantitative and instrumental analysis laboratories. Discusses these activities in terms of illustration of principles, awareness, and critical thinking. (CW)