Describes the theory and performance of a diffusion experiment based on the free boundary method. Suitable for biochemistry and microbiology students taking physical chemistry. (MLH)

Describes a set of laboratory experiments that illustrate proteolytic enzyme action and specific properties of bromolain, including some insights into the active site mechanism of peptide hydrolysis. (MLH)

Describes two laboratory experiments involving metal ions and porphyrin ligands. (MLH)

Describes an experiment that illustrates the following points concerning the experimental determination of trypsin activity: (1) there is a difference in basing enzyme concentration on weight, absorbance, or active sites; and (2) the method of expressing enzyme concentration determines the value of specific, molecular, and catalytic center…

Discusses a biochemical engineering course that is offered as part of a chemical engineering curriculum and includes topics that influence the behavior of man-made or natural microbial or enzyme reactors. (MLH)

Discusses some of the current theories on aging, such as biological time clocks for certain cells and on-off switches for genes, that were offered as explanations at the 140th annual meeting of the American Association for the Advancement of Science (JR)

Discusses recent trends in chemistry education: course requirements, permanent education, drug uses, chemists' participation in educational symposia, implementation of Keller's plan, roles of the Technician Education Council, and an example of grammar school teacher promotion. (CC)

Short articles on a demonstration of enzyme action, models of mammalian circulatory systems, measuring the height of trees, the ecology of the African amphibian Xenopus under natural conditions in England, experiments with liverwort gemmae, investigations using stick insects, and a culture medium for Paramecium bursaria. (AL)

Illustrates an account of the University of Illinois Programmed Logic for Automatic Teaching Operations (PLATO) system of individualized instruction by describing four undergraduate topics. (AL)

Clinical experiences in medical education offer more relevant experiences to students. (HS)

Discusses the relationship between chemisty and biology in the science curriculum. Points out the differences in perception of the disciplines, which the physical scientists favoring reductionism. Suggests that biology departments offer a special course for chemistry students, just as the chemistry departments have done for biology students.…