622 



Ind 



ex 



N 



O 



Near-sighted, 39 

 Negative after-potential, 80, 81 

 Negative feedback, 71, 92-96 

 Neoretinene b, 353-354 

 Nernst glower, 490 



Nerve, 67-136, 180-182, 437-459 (see also 

 Axon and Neuron) 



afferent pathway, 75, 89 



auditory fibers of moths, 180 



clamped, 446-457 



prediction of spike potential, 455-456 



efferent pathway, 76, 90 



impulse conduction, 69—87 



membrane : 



ionic conductances, 451 



membrane potential, 70, 78-83 

 and ACh, 443-446 

 and Donnan potential, 439 

 ionic currents, 449—452 



molecular basis of conduction, 437-459 



peripheral, 75 



specific, 75 

 Nervous system, 69—71 

 Neural sharpening, 111—113 

 Neuromuscular junction, 84-87 



ACh packets, 86 

 Neuron, 69, 74 



anatomy and histology, 74—78 



bipolar (in retina), 125—126 

 amacrine, 125-126 



cell body, 74, 77 



conduction rate, 80—83 



ganglion cells (in retina), 126 

 Neurospera, 197 

 Neutron, 185, 612 



high energy, 612 



thermal, 612 

 Neutron activation, 587 

 Newtonian fluid, 182 

 Nissl substance, 74, 77 

 Nitella, 81, 180, 181 

 Ni5, 568-569 

 Nodal points, 30, 603 

 Node, 9 



Node of Ranvier, 74, 77 

 Noise : 



physiological, 14 

 Nonionizing radiations, 204—205 

 Nonlinearity, 20, 22, 594 

 Nuclear magnetic resonance (NMR), 532 

 Nucleic acid, 253, 269, 277-296 



structure, 277-296 

 Nucleoli, 189 

 Nucleoplasm, 268 

 Nucleoside, 277-278 

 Nucleotide, 277-278 

 Nucleus : 



in central nervous system, 75, 90 

 Numerical aperture, 541 

 Nvt, 188 



Objective, 538 



Olfaction, 52, 65 



Ommatidia, 45, 129, 131-132 



Opsin, 353 



Optical activity, 273, 549 



Optical density, 488-489 



Optic axis, 600 



Optic disk, 35 



Optic nerve (second cranial nerve), 119 



coding of information, 470 

 Optics (geometrical), 29-34, 37-39, 

 595-604 



focal length, 599 



image, 597 



object, 597 



real, 597 



virtual, 597 

 Orbital, 504 



Orbital electron capture, 559 

 Organ of Corti, 24-25, 105 

 Oscillation: 



modes of, 237 

 Osmotic pressure, 388 

 Ossicles, 21-24, 65 



anvil, 21 



hammer, 21 



incus, 21 



malleus, 21 



stapes, 21 



stirrup, 21 

 Oval window, 22 

 Overtone, 8, 9 

 Oxidation: 



biological, 344-346 

 Oxidative phosphorylation, 346—349 



Pacemaker, 161, 165 



Pacian corpuscle, 146 



Pain, 52 



Paper radiochromatography, 368 



Para-chloro-mercuribenzoate, 327 



Paramagnetism, 525-528 



Paramecium: 



optimum frequency vs size, 234 



relative fragility, 229 

 Parasympathetic system, 76 

 Partial molal thermodynamic quantities, 



391-392 

 PCMB, 327 

 Penicillin, 309 

 Peptide bond, 273 

 Perilymph, 24 

 Permeability, 420, 425, 429-432 



altered by ACh, 444 



constant, 425 



P, 430 



red blood cells, 429-432 

 various solutes, 432 

 to water, 430-431 



