Describes a laboratory experiment on resistance to teach about evolution and issues of misuse of antimicrobial compounds. Investigates Escherichia coli's response to treatment of triclosan, a biocide used in consumer products. (Contains 12 references.) (YDS)

Describes a science activity on the importance of meiosis for variability. Uses a coin flip to demonstrate the random arrangement of genetic materials and explains how this results in zygotes with a new DNA combination. (YDS)

Describes the necking of polymer sheets that occurs when they are stretched. Discusses the effect and the mechanisms of necking. Lists four references. (YP)

Although the vast majority of articles cited by Jeanne Chall and Marie Carbo fit the patched-up program evaluation category, the outcomes of nine randomized field experiments are the best evidence available in the research literature. Systematic phonics is an example of the weak instructional treatments presently plaguing education. Includes 16…

Offers a unit of laboratory instruction for a general technology class that looks at ergonomics--the engineering science that seeks to prevent disorders caused by uncomfortable or stressful working conditions. The activity involves the measurement of body motions. (JOW)

Focuses on three habits associated with personal values and attitudes, and one habit associated with social skills of doing science. Illustrates four habits of mind, first through a story of modern scientific investigation, then as the basis of school laboratory science experience. Discusses implications related to integration of these four habits…

Describes a unit of laboratory work which was unusual in that the teacher's purpose was to develop students' understanding of the way scientific facts are established with little expectation that they would understand the science content involved in the experiments. The unit was very successful from both a cognitive and affective perspective.…

Presents an activity on liquid chromatography that demonstrates the influence of mobile phase polarity on the separation of dyes with different solubilities. (YDS)

Introduces an inquiry-based lab design in which students try to find evidence on a particular problem. Investigates the effects of decreases in the pH level on the environment. Includes students' hypotheses and research results. (YDS)

Describes a demonstration in which a teacher or student can relight a blown out candle from a burning candle held about 2-3 centimeters directly above it. (SAH)

Both a control group and experimental group (23 students each) received a lecture on direct current circuits; the experimental group also participated in a lab using a device explaining an analogy for electric current. The experimental group's posttest scores were much higher, indicating that the analogical device helped overcome student…

Describes a method for working with Coomassie Blue to analyze banding patterns of purified eukaryotic cell membrane proteins. (SAH)

Describes a laboratory experiment on the determination of the molecular weights of gases lighter than air. (YDS)

Presents an experimental procedure to measure the volume of a gas more accurately and which requires very common and inexpensive materials. (YDS)

Discusses the quality of textbooks, worksheets, and laboratory manuals and presents Project 2061's review of science and mathematics textbooks in the United States. (YDS)