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)

Reports on a study of writing apprehension in writing center tutors, results of which indicated a strong correspondence between various dimensions of writing apprehension and specific teaching behaviors that do not aid the student in problem detection or writing improvement. (HTH)

Discusses the instructional potential of Chlamydomonas in providing a basis for a range of experimental investigations to illustrate basic biological phenomena. Describes the use of this algae genus in studies of population growth, photosynthesis, and mating behavior. Procedures for laboratory exercises are included. (ML)

Highlights five major analytical areas (electrophoresis, immunoassay, chromatographic separations, protein and DNA sequencing, and molecular structures determination) and discusses how analytical chemistry could further improve these techniques and thereby have a major impact on biotechnology. (JN)

The results of an experiment indicated that approaches using a supplementary workbook, a lab, or the content contained in the regular textbook were all effective in increasing basic writing skills. Results also indicated that a supplementary workbook containing discussions, examples, and drills was the most effective approach, but it also used the…

Discusses six common problems which may occur when using temporary labels on chemicals, samples, or mixtures in teaching or research laboratories. Solutions to each of these problems are offered. (JN)

Background information, procedures, and results are presented for experiments on the pyridoxal/metal ion model system. These experiments illustrate catalysis through Schiff's base formation between aldehydes/ketones and primary amines, catalysis by metal ions, and the predictable manner in which metal ions inhibit or catalyze reactions. (JN)

Continues a discussion of magnetic fluids by providing background information on and procedures for conducting several demonstrations. Indicates that, with a little patience and ingenuity, only modest magnetic fields and about 20 ml of low-viscosity, commercial magnetite-water-based magnetic fluid are required. (JN)

Although indicators are omnipresent tools in aqueous chemistry, they have not been used extensively to assign solvent properties in nonaqueous systems. Therefore, recent research into a system of metal complexes that can be used to assign donor and acceptor numbers to nonaqueous solvents is summarized. Pertinent experiments are also described. (JN)

Reports on a project used in a junior-level laboratory in which students prepare two alcohols, characterize these compounds, and use a shift reagent for structure determination and peak assignment. Background information, materials needed, procedures used, and typical results obtained are included. (JN)

Describes a technique that uses the materials of the language laboratory to develop fluency at the advanced level of Russian. Each week students receive a picture and a vocabulary list that relates to a story that they then listen to on a cassette. A conversation class completely in Russian follows. (SED)

Discusses microcomputer network benefits; points out their current shortcomings in the areas of software availability and legal use, required equipment, and vendor reliability; describes how to set up a worthwhile specialized network despite these shortcomings; and outlines reasons for expecting networks to play a larger future role in education.…

Gel filtration is a form of liquid chromatography that separates molecules primarily on the basis of their size. Advantages of using this technique, theoretical aspects, and experiments (including procedures used) are discussed. Several questions for students to answer (with answers) are also provided. (JN)

Presents a buffer demonstration which features visualization of the effects of carbon dioxide on pH. Background information, list of materials needed, procedures used, and a discussion of results obtained are included. (JN)

Background information (theory), apparatus used and procedures required are provided for an experiment which involved the measurement of the deviations of carbon dioxide from perfect gas behavior by means of pressure/volume (pV) measurements at pressures of up to 20 atmospheres at room temperature. (JN)