Presents a simple, practical, and inexpensive method for growing microorganisms that will help middle school students experience microorganisms and introduce them to important science concepts. Students grow microorganisms and investigate questions concerning environmental factors that affect growth of populations. (LZ)

Describes a unit of study of microorganisms employed with great success by over 100 teachers. The guide is a laboratory manual containing no prodedures or instructions. Only a brief problem statement is included. The student is the researcher and works out his own questions, procedures, results, and observations. (DF)

Describes a technique for comparing the number of bacteria in various soil samples. The equipment and materials are readily available, and the technique is suitable for high school students. (JR)

Presents lab exercises in which students use the microscope to study cells. Describes these activities as allowing students to work independently and become more proficient at microscope use. Students also gain a deeper understanding of the more invisible world of science. (Author/KHR)

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)

Presents an activity designed to stimulate student interest and facilitate the study of microorganisms. Focuses on an epidemic situation in which students play the role of epidemiologists. (DDR)