Index 



283 



Suspensions — continued 



thixotropy, 88, 89 



ultrasonics, effect on, 96 

 Svedberg, T., 40, 253, 267 

 Szegvary, A., 97, 245 

 Szent-Gyorgyi, A, 37-38 



Tactoids, 92, 93 

 in mixed sols, 93 



Taxis, 242 



Temperature, 65 



Tensile strength, 5, 6 



Tension 



at a surface, 259 



contractile, 163, 165, 166. 168. 169, 

 173, 174, 175. 182, 187. 189, 190. 

 194 

 Tetrahedral angle, 47 

 Tetranucleotides, 61 

 Thiamine model, 63 

 Thiamine pyrophosphate, 61, 69 

 Thixotropic gels, 31, 85 ff., 153 

 Thixotropic setting, 246, 249 



anesthesia due to, 248 



bentonite sols, 94 



Thixotropic sols, 86 



Thixotropy, 85-96, 245-249 



and coagulation, 89, 94 



and light absorption, 90 



and nonspherical particles, 93 



and peptization, 91 



definition, 246 



of gels, 31 



of protoplasm, 31-32, 245 ff. 



of oxide gels, 87, 89 

 Thymonucleic acid, 110 

 Tobacco mosaic virus, 29, 88 

 Tonoplast, 101-102 

 Tradescantia, 120 

 Trillium, 100, 114, 120, 122 

 Triose, 69 



Tnturus torosus, 191, 192 

 Tyrosine, 56, 65 



Ullrich, H., 26, 40 



Ultrasonic waves, 95 

 coagulating action, 96 

 dispersing action, 95 

 liquefaction of gels, 95 



Vacuoles 



submicroscopic, 69, 70 

 Valence angles, 75 



Van der Waals' forces, 62, 64, 65, 71, 

 75, 76, 92, 253, 270 



Vanadium pentoxide, 90, 93, 94 



Vassy, E., 97 



Verwey, E. J., 98 



Verworn, M., 97 



Viscosity 



anomalous, 33, 86, 87, 94; see also 



anomalous flow, non-Newtonian 



liquids, structural viscosity 

 calcium ion in relation to, 164 

 change due to CO2, 165 

 colloidal solutions, 85 ff . 

 gels, 31 



local changes, 167 

 measurement, 208 

 motive force vs., 209 

 protoplasm, 31-32, 164 ff., 208, 209, 



210 

 rapid change, 8 



regulation and polarization, 168 

 slime mold, 176, 177, 184, 208. 209, 



210 



Volume change in relation to stream- 

 ing, 155 

 Vouk, v., 211 

 Vries, H. de, 101 



Wall; see cell wall 

 Watanabe, A., 235 



Water 



aggregation of, 47, 48 

 electrical fields, 47 

 molecule, 7 

 radius, 47 

 shells, 64 

 structure, 47, 48 



Wedmore, E. B., 232 

 Wermel, E. M., 115 

 White, M. J. D., 114, 119 

 Wilson, E. B., 97 

 Wilson, G. B., 114, 120, 122 

 Wipf, L., 117 



X-rays 



breakage effects, 121 

 diffraction, 112 



Yield value, 86, 207 



Zein configuration, 52 

 Zocher, H., 97 

 Zocher, H. Z., 98 

 Zw^itter ion, 65 



