The techniques of plant organ, tissue, and cell culture concentrated on reproducibility, simplicity and accu are now established in many research laboratories racy with sufficient illustration to make all mani throughout the world and are being used in numerous pulations clear. areas of plant science. Methods have been developed The drawings of items used in the bench layout to propagate plants and free them from viruses using diagrams are symbolic and are 'keyed in' by number to shoot tip culture. The regeneration of plants from callus the list of materials and equipment. A line around an...

Estuaries and Wetlands are important coastal resources which are subject to a great deal of environmental stress. Dredging, construction, creation of intertidal wetlands, regulation of fresh- water flow, and pollution are just a few of the activities which affect these coastal systems. The need to predict the effects of these perturbations upon ecosystem dynamics, particularly estuarine fisheries, as well as on physical effects, such as sedimentation and salt intrusion, is of paramount importance. Prediction requires the use of models, but no model is likely to be satisfactory unless...