Describes a simple method for purifying catalase for the study of proteins. Procedures are systematically and diagramatically presented. Also identifies polyacrylamide gel electrophoresis, kinetic studies, and apparent molecular weight determination as possible techniques to be used in studying proteins. (ML)

Presents an experiment which enables weed science students to observe first-hand the process of herbicide leaching in soils. Features of this technique which demonstrate the movement of herbicide within a column of soil are outlined. Diagrams are provided of the apparatus employed in the exercise. (ML)

Considers the deviation from the ideal flows of both a backmix tank and a backmix tank followed by a flow vessel. Background information, apparatus used, and experimental procedures are provided. Typical results are also provided and discussed. (JN)

Describes three computer programs designed to control and execute standard methods for paired associate learning. They can be used in classroom demonstrations or laboratory exercises in experimental psychology. (RM)

Describes a variety of laboratory experiments including carbon dioxide reduction, animal respiration, atmospheric pressure determination, and others, that can be performed using discarded syringes. (GS)

Describes an experimental method of isotope dilution analysis that determines radioactive compound volume rather than mass. Suitable for degree-level biology and chemistry students. (MLH)

Describes an experiment that utilizes an acidic ion-exchange-chromatography column to separate two cobalt complexes. (MLH)

Presents an undergraduate experiment that uses ion-exchange techniques to recover the silver chloride precipitate from argentimetric determinations of chloride ions. (MLH)

Discusses some current research on hemoproteins, describes the process of metal replacement in hemoproteins, and reviews the preparation of cobaltmyoglobin. (MLH)

Describes an experiment in which two organic compounds having the same nmr spectra are identified by their differing mass spectra. (MLH)

Describes an experiment in which the photooxidation of methionine using free methylene blue as the sensitizer is applied to the isolated amino acid or to the methionyl residues of a complex polypeptide. (MLH)

Discusses ten methods for measuring the thermal expansion of solids and the way in which the expansion coefficient relates to other properties of matter. (MLH)

Discusses the difficulty of explaining the concept of entropy, and provides exercises, experiments, and discussions concerning entropy. (MLH)

Suggests several mechanisms for catalysis by metal ion complexes. Discusses the principal factors of importance in these catalysis reactions and suggests reactions suitable for laboratory study. (MLH)

Presents an inorganic oxidation-reduction kinetics experiment, and describes a low cost (less than $50) modification of the Bausch and Lomb Spectronic 20 Colorimeter which will provide a linear output in absorbance. (MLH)