Techniques for examining terrestrial and aquatic microorganisms using flattened glass capillaries are described. Capillaries can be left in natural or artificial environments for appropriate periods of time and removed for direct microscopic examination. Examples of organisms observed using the technique are given and suggestions made for wider…

Describes a simple, inexpensive continuous culture apparatus (chemostat) and its applications in teaching biological concepts (growth-limiting factors and competition). Other suggested uses include experiments in enzyme induction, biosynthesis, and strain selection, and for student research projects. (JN)

Provided are directions for culturing bacteria by using yoghurt as a culture medium. Yoghurt is a safe medium and results in an end product which may be eaten if desired. (PB)

Presented is a cytogenic technique which enables students to produce preparations of dividing cells. Described are materials, methods, typical results, and assessment for this activity. The usefulness for a wide range of ages and abilities is stressed. (CW)

Described is a laboratory experiment that can be used to investigate bacterial survival in soil or water as well as the study of genetic transfer via conjugation. Discussed are materials, laboratory procedures, typical results, and a list of six references. (CW)

Presented is a brief review of the historical importance and knowledge of pneumonia which emphasizes the importance of type transformation. The results of a survey of textbook coverage of this topic are given. The significance of type transformations are discussed. (CW)