Materials and methods for studying the functioning and responses of stomatal guard cells are described. (PB)

Described are some experiments on geotropism that may be done using dandelions. (PB)

Describes a constant-temperature observation chamber and includes instructions on constructing the apparatus. Suggestions for use are given as well as problems that might be encountered. (Author/SA)

Recommendations are given for obtaining high quality preparations of chromosomes with relatively little equipment using an improved Feulgen-squash technique. (Authors/SA)

Presents a method for microscopically examining cytoplasmic streaming in root cells, and physiologically examining the delivery of ions to the xylem exudate. The expected result does not occur and the authors believe that students learn to re-examine the assumptions, thereby increasing their skills in scientific inquiry. (Authors/SA)

Discusses various aspects of in-service training and the design of self-instruction material. Special reference is given to materials for application in various places but developed at a central location. Results are given of the use of experimental materials in medical laboratories in The Gambia. (Author/SA)

Background information on the methods and varieties used to demonstrate the cultivation of plants without the use of chemical pesticides is provided. Discussed are species and variety selection, growing plants from seed and from seedlings, soil preparation, using cuttings, useful crops, and pest control. (CW)

Two representations useful in teaching transmission genetics are described. Details of the representations and problem solving using these instructional aids are discussed. The importance of developing representations which help remedy specific difficulties that students commonly encounter is stressed. (CW)

A method of obtaining a crude mitochondrial extract from sheep and beef heart is described. The respiratory substrates succinate and malate are examined as well as the inhibitory effect of malonate. An interface with a microcomputer for plotting colorimeter results is discussed. (Author/CW)

Traditional and novel uses of enzymes and microbes in the baking, brewing, and dairy industries are described. Cheese, yogurt, baking, brewing, vinegar, soy sauce, single-cell proteins, enzymes, food modification, vanilla, citric acid, monosodium glutamate, xanthan gum, aspartame, and cochineal are discussed. Industrial links with firms involved…

Reviews a range of developments in methodology for studying digestive physiology including comparative anatomy, fistulas and canals, imaging, electromyography, and tracers. Exercises for gathering firsthand data on the use of tracers, analyzing secondhand data on tracers, and interpretation of comparative anatomy of bird stomachs are given as…