Describes how a sample of iodine-131-labelled tin (IV) iodide can be used to estimate the mass of tin (IV) iodide present in a mixture with sodium chloride, by isotope dilution analysis. (MLH)

Describes the building design and interior laboratory features of the science center at Australia's Sturt C. A. E., an institution of higher learning. Photographs are included. (MLH)

Five keys or procedures for conducting an outdoor laboratory which should lead to a well controlled and informative experience for all students. (HD)

Describes how to construct a form of a Kelvin Electrostatics Generator from readily available components and provides an explanation of how it works. The device can generate 10-12 mm long sparks in the air. (DDR)

Suggests the cells of an apple peel as a plant species that can further enhance the plant cell laboratory. Describes the structure of apple peel cells and the benefits of including them in studies of plant cells. Suggests questions to stimulate further investigations for open-ended laboratories or independent studies. (PVD)

Describes an experiment designed to determine ascorbic acid concentrations in natural orange juice. The experiment is used with undergraduate pharmacy students to allow understanding of the principles of operation of the coulometer and polarograph. (DDR)

Discussed are the kinetic interactions of these chemical processes and the determination of the actual order of such reactions. Included are multiple exchange, catalytic exchange with deuterium, and depletion of the original substrate. (CW)

Discussed is an analytical technique that uses photons from lasers to resonantly excite an electron from some initial state of a gaseous atom through various excited states of the atom or molecule. Described are the apparatus, some analytical applications, and the precision and accuracy of the technique. Lists 26 references. (CW)

Institutions of higher education that use animals in laboratory research have become targets of intense scrutiny regarding the treatment of those animals, the value of research, and the amount of federal funds they receive. The largest and most active animal-rights organization is People for the Ethical Treatment of Animals. (MLW)

To integrate a research/discovery component into one course, an experiment using the sea urchin embryo system is introduced because the teacher manages only one organism and students provide the variables. The materials, handling methods, and experimental methods of the experiment are described. (YP)

Describes some experiments showing both qualitatively and quantitatively that aerodynamic lift is a reaction force. Demonstrates reaction forces caused by the acceleration of an airstream and the deflection of an airstream. Provides pictures of demonstration apparatus and mathematical expressions. (YP)

Explains the lifting force based on Bernoulli's law and as a reaction force. Discusses the interrelation of both explanations. Considers accelerations in line with stream lines and perpendicular to stream lines. (YP)

Develops a manostat which is simple and inexpensive to construct and operate, compact and rugged in design, useful over a wide pressure range, and well adapted for practical usage. Provides methodology, a diagram, and some operating suggestions. (MVL)

Described is an experiment which uses an autotrophic bacterium to anaerobically oxidize hydrogen sulfide to sulfate in a batch-stirred tank reactor. Discusses background information, experimental procedure, and sample results of this activity. (CW)

Reports an experiment for examining protein-ligand binding using the enzyme carbonic anhydrase. Describes the experimental procedures consisting of the syntheses of an azosulfonamide and its complex formation with carbonic anhydrase. (YP)