Describes a single technique for an enzyme assay of catalase. The method shows that vegetable seeds submitted to pre-sowing 'hardening' cycles of imbition and drying have greater catalase activity and more rapid germination than do the controls. (LS)

Briefly describes some of the more recent developments in the use of human hairs for such instructional purposes as observing barr bodies and chromosomes, and for culturing to produce cells of both epithelial and fibroblastic morphology. Three main hair categories are also described. (JN)

Described is an experiment investigating carbon dioxide fixation in the dark and the diurnal rhythm of acid production in plants exhibiting Crassulacean Acid Metabolism. Included are suggestions for four further investigations. (SL)

Described are embryology experiments demonstrating effects of lithium on the nervous system and the use of hypertonic salt solutions to produce exogastrulation in the eggs of Xenopus laevis. (SL)

Described are science experiments which utilize methylene blue to demonstrate the effects of pH, temperature inhibitors, and concentration on enzyme reactions in yeast enzyme systems. (SL)

Describes equipment for recording human breathing (stethographs, tambors, spirometers), construction of pooters (pipettes), field exercise on examining epiphyte distribution on tree bark, and vertebrate skeleton models for teaching locomotion. Includes abstract of student research project examining pH on Colpoda encystment and reviews of…

The shore crab (Carcinus maenas) is an excellent subject for school study, both in the field and the laboratory. It is easily collected and maintained and can be used for a wide range of investigations. Some background details are given and possible areas of investigation suggested. (Author)

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 the life cycle, reproduction, and various classroom uses of the Louisiana Red Swamp Crayfish. Includes advantages and disadvantages of two different culturing techniques. (JN)

Describes a number of laboratory experiments using woodlice as experimental animals. Includes topics such as physiology of water relations, behavior, and rhythmic activity. (CS)

Describes methods for collection, culture, observation, and making permanent stained preparations of the protozoan vorticella. Suggestions are made for experiments to investigate growth, reproduction, settlement, ecology, feeding, and osmoregulation. (CS)

Briefly refers to the history, physiological background, and adaptive implications of two theories concerning the limits of sensory discrimination. An experiment is described, suitable for college and high school students, which investigates the validity of the two theories. (CS)

Describes a simplified version of New's method for culturing early chick embryos. The technique allows continuous observation of the critical first three days of development and the conditions for setting up successful cultures are also presented to help both teachers and students. (HM)

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)

Discussed are hazardous substance regulations in Great Britain which effect science teaching at the secondary and college level. Included are background information, immediate implications for schools and colleges, and risk assessments concerning biology classrooms. The responsibilities of Local Education Associations are highlighted. (CW)