Discusses a method to use several diffraction gratings at one time with one hydrogen bulb. Describes the experimental set up, background, and results. (CW)

Describes a purification process through affinity chromatography necessary to obtain specific blood group glycoproteins from erythrocytic membranes. Discusses the preparation of erythrocytic membranes, extraction of glycoprotein from membranes, affinity chromatography purification, determination of glycoproteins, and results. (CW)

Discusses the importance of laboratory experiments in which students were given a few guidelines and small groups had to design the experiments. Describes the old and new orders of laboratory projects and the effects of change. (CW)

Recounts the problems of a high school chemistry program in safely storing and disposing of chemicals. Describes the school's new system of inventorying and dating all chemicals, using warning stickers, isolating certain hazardous substances, and cataloging references to the use of each chemical and its container. (TW)

Presents a technique for eliminating errors in the analysis of the nickel subgroup of the aluminum-nickel group cations. Describes the process of color and chemical changes that occur in this group as a result of ligand and coordination number changes. Discusses opportunities for student observations. (TW)

Describes the construction of a low-cost (about $70.00) alternative to the commercial fraction collector. Outlines the separate parts of the collector and provides a schematic of electronic circuitry of the instrument. Lists special items required for the development of this project. (TW)

Determined that an instructional unit on laboratory safety could increase student safety knowledge and reduce the number of unsafe behaviors. A list of unsafe behaviors which were observed with the 333 students is included. A recommendation that positive attitudes toward safety be developed is given. (DH)

Discusses consequences of using computer-assisted learning (CAL) packages for experiment planning in undergraduate physical chemistry laboratories and examines textbook presentations and syllabus criticism. An approach to syllabus reconstruction that combines operational research with experiences of CAL development program is demonstrated through…

Student-centered approach of scoring the concept maps consisted of three elements namely symbol system, individual portfolio and scoring scheme. We scored student-constructed concept maps based on 5 concept map criteria: validity of concepts, adequacy of propositions, significance of cross-links, relevancy of examples, and interconnectedness. With…

In a number of states, students from kindergarten through high school have won the right to refuse to dissect or kill animals and the right to substitute an alternative project. This booklet was designed to help college science students take an ethical stand by refusing to participate in dissection exercises. The booklet begins with an overview of…

Plant tissue culture has developed into a valid botanical discipline and is considered a key area of biotechnology, but it has not been a key component of the science curriculum because of the expensive and technical nature of research in this area. This manual presents a number of activities that are relatively easy to prepare and perform. The…

Suggests that a governmental agency, most likely Occupational Safety and Health Administration (OSHA) be considered in the safety design stage of any experiment. Focusing on OSHA's role, discusses such topics as occupational health hazards of toxic chemicals in laboratories, occupational exposure to benzene, and role/regulations of other agencies.…

Describes the use and handling of alkali metals in school laboratories and seeks to reexamine precautions which one may reasonably take before executing routine procedures since their use, even by skillful teachers, occasionally results in accidents in the form of violent explosions. (Author/SK)

Describes experiments which can be completed in five four-hour laboratory sessions, including two synthesis (alpha-phenylbutyric and alpha-phenylbutyric acid anhydride) and determining the absolute stereochemistry of secondary alcohols using the synthetic products. (JN)

Describes an experiment as an alternative to undergraduate experiments limited to high temperature metal systems or lower temperature systems involving objectionable or unstable materials. Lists six advantages of the experiment. (Author/JN)