Describes an audiovisual teaching unit on the chemical laboratory technique of recrystallization which was developed along problem-solving lines and based on observation of student laboratory behavior. Discussion includes usual procedures for developing such units, how this unit solves problems typically associated with teaching, and its general…

This study explores the effectiveness of conceptual change oriented instruction and standard science instruction and contribution of logical thinking ability on seventh grade students' understanding of heat and temperature concepts. Misconceptions related to heat and temperature concepts were determined by related literature on this subject.…

This CD-ROM is designed to spark the interest of students with science activities and demonstrations similar to "Jake's Attic" and "Mr. Wizard." This first volume of the "Whelmers" collection engages students in science process thinking. The activities are meant to "whelm" the students, not overwhelm them.…

The Human Use Regulatory Affairs Advisor (HURAA) is a Web-based facility that provides help and training on the ethical use of human subjects in research, based on documents and regulations in United States Federal agencies. HURAA has a number of standard features of conventional Web facilities and computer-based training, such as hypertext,…

A prototype system based on an inverted pendulum is used to study the Quality of Service and discuss requirements of remote-experimentation systems utilized for carrying out control engineering experiments over the Internet. This class of applications involves the transmission over the network of a variety of data types with their own peculiar…

This document presents a science experiment demonstrating the scientific method. The experiment consists of testing the fermentation capabilities of yeasts under different circumstances. The experiment is supported with computer software called BioLab which demonstrates yeast's response to different environments. (YDS)

Reviewed research on the effect of the presence of other people on individuals' willingness to help in an emergency. Attention was paid to the nature of the precipitating incident; ambiguity of the helping situation; laboratory versus field settings; characteristics of subjects, victims, and bystanders; and communication among bystanders.…

Described is a diffusion apparatus to be used in an undergraduate physical chemistry laboratory experiment to determine the diffusion coefficients of aqueous solutions of sucrose and potassium dichromate. Included is the principle of the method, apparatus design and description, and experimental procedure. (Author/DS)

Described is a science experiment involving the isolation and study of microorganisms. Bacteria from the mouth are cultured on blood agar culture plates and are then exposed to four different mouthwashes to test their effectiveness. (DS)

Outlines a variety of laboratory procedures, discussions, and demonstrations including in vitro contraction of muscle fibres and muscle proteins, sucrose density-gradient centrifugation, fern spore development, digestion of starch, construction of a small mammal trap, microscope selection, and occurrence and toxicity of mycotoxins. (GS)

Outlines a variety of laboratory procedures, discussions and demonstrations including the preparation and analysis of a square planar copper (11) complex, thermit reactions in a sand mould, product solubility, an aid for learning common oxyanions, thermal decomposition of nitric(v) acid. and nine others. (GS)

Outlines a variety of laboratory procedures, discussions, and demonstrations including a no-solder circuit board, damped to maintained oscillations with L-C circuits, polaroid strobe photos, resistive putty, soldering and circuit checking exercise, electromagnetic radiation, square pulses in C-R circuits, and testing an oscillating system. (GS)

Data are presented from a Canadian study to show that the cost of laboratory testing is escalating and represents a sizable proportion of hospital costs. Policy interventions will require thorough analysis and will require sophisticated control programs at various levels in the laboratory inquiry system. (Author/MLW)

Presents an experiment which uses readily available starting materials and inexpensive equipment for synthesis of transition metal carbonyls at 1000 atm and which is intended to give students experience in techniques used in research and industry. Safety precautions are emphasized. (Author/SA)

A three-point linkage system in tomatoes is used to explain concepts of gene mapping, linking and statistical analysis. The system is designed for teaching the effective use of statistics, and the power of genetic analysis from statistical analysis of phenotypic ratios. (Author/SA)