190 



SUBJECT INDEX 



U 



w 



Ultrastructure, of cells, 18, 104-7 



Plate I 

 Ultraviolet light, 50,165 

 Ulva lactuca (sea lettuce), 18, 49-50, 



60,103,153,154,155 

 Uncoupling agent {see 2:4 dinitro- 



phenol) 

 Unequal absorption of anions and 



cations, 11, 52-3 

 Unicellular algae, 18,19.57 

 Uranyl ions, 110 



Vacuolar membrane (see tonoplast). 

 Vacuolar sap, 5, 20, 22, 87, 95, 120, 



150 

 Vacuoles, 12,19,21,75 

 Vallisneria spiralis, 21, 63, 100, 108- 



10, 129 

 Valonia spp., 11, 19, 20, 63, 71, 76, 



153-4 

 Vanadium, 7 

 Vesiculation, of protoplasm, 43, 89, 



106, 164 

 Viciafaba (broad bean, Boston bean), 



63, 70, 99, 112, 116, 123, 159, 



Plate II 

 Viscosity, coefficient of, 30-1 

 Vitamin B12, 7 

 Vitamms, 64 



Water absorption, 112, 114-6, 149, 



150 

 Water culture {see solution culture) 

 Water free space (WFS), 97-8 

 Weathering, of soils, 1 39 

 Wettability of leaves, 1 3 1 

 Wheat {see Triticum aestivum) 

 Willow {see Salix sp.) 



Xylem, 15 



translocation of salt in, 122-4 

 transport of salts into, 1 1 7-9 



Xylem sap, 119-21,122,124,133 



Y 



Yeast, 18, 19, 45, 60, 75, 84, 97, 98 



Zea mavs (corn, maize), 3, 49, 52, 

 53-4,58,69,70,113, 116, 140 



Zinc, 6,108,146 



Zostera maritiina, 152, 153, 155 



Zygote, 155 



