American Journal of Physiology, Volumen4American Physiological Society, 1901 Volumes for 1898-1941, 1948-56 include the Society's proceedings (primarily abstracts of papers presented at the 10th-53rd annual meetings, and the 1948-56 fall meetings). |
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action current amount animal appears Archives italiennes artery average beats bladder blood blood-pressure body c.c. NaCl CaCl2 calcium cataphoric cathode cause cells cervical Chatopterus cilia Colpidium contractions cubic centimetres curve Daphnia depressor nerves digestion direction effect electrodes excretion experiments fæces fall FIGURE forced movement gesammte Physiologie gland grams granules hæmorrhage heat of combustion hypnotic sleep increase ingestion injection intervals italiennes de biologie Journal of physiology larvæ leucocytes light LOEB method minutes mucine muscle muscular NaCl nitrogen observed obtained organism osmotic pressure Oxytricha paranuclein parthenogenesis period phosphorus phrenic planarians plethysmograph poison potassium proteid reaction respiration rhythmic rise saliva salt solution side sodium chloride spermatozoon splanchnic nerves spring stimulation strips suggestion suprarenal swimming TABLE temperature tension tion tissue trochophores tube unfertilized eggs uric acid urine variations vasomotor xanthine xanthine bases ΙΟ
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Página 170 - J while engaged in the study of the digestive products of casein, carried out a series of analyses of the insoluble residue corresponding to Lubavin's dyspeptone. His preparations contained an average content of phosphorus amounting to 2.57 per cent. It was pointed out, however, that in every case the phosphorus found in the ash of the products analyzed was as great as the total phosphorus observed and Chittenden arrived at the conclusion " that instead of being a phosphorized compound, it (dyspeptone)...
Página 251 - The retarding influence of acid-proteids is out of all proportion to their power of destruction. Large percentages, however, of acid-proteids may cause almost complete destruction of the ferment. 10. The most favorable condition for the diastatic action of ptyalin, under most circumstances, appears to be a neutral condition of the fluid together with the presence of more or less proteid matter. The addition of very small amounts of hydrochloric acid, however, to dilute solutions of saliva, giving...
Página 477 - The light operates, naturally, on the part of the animal which it reaches. The intensity of the light determines the sense of the response, whether contractile or expansive, and the place of the response, the part of the body stimulated, determines the ultimate orientation of the animal.
Página 472 - ... many times until the organisms are swimming either toward the end D or toward the end L. In course of time it is found that the preponderance of movement is toward the dark end /?, so that the majority of the Stentors are gathered at D. Why this should be so is explained by Holt & Lee as follows : The reason why the Stentors went eventually in greater numbers toward D, and thus appeared oftener to choose e than f, is that such Stentors as went to r progressed farther toward D than those which...
Página 428 - Ca0l 2 +90 All these solutions have one element in common, namely, the about equal increase of the osmotic pressure. It seems therefore justifiable to assume that the increase in the osmotic pressure or the loss of water on the part of the egg is the cause of the parthenogenetic development of these eggs.
Página 454 - The general opinion concerning the role of the spermatozoon in the process of fertilization is that it acts as a stimulus, and that as such it starts the development of the egg. ... If we consider the fact that the eggs show at least a beginning of segmentation under 'normal' conditions, the act of fertilization assumes a different aspect. The spermatozoon can no longer be considered the cause or the stimulus for the process of development, but merely an agency which accelerates a process that is...
Página 182 - ... pressure inside the egg is furnished chiefly or almost exclusively by electrolytes. It is thus not impossible that the ions in the egg, if their concentration is raised, bring about that change which causes the egg to develop. If we assume that the spermatozoon starts the development of the egg in the same way as in the case of artificial parthenogenesis it follows that the spermatozoon must possess more salts or a higher osmotic pressure than the eggs. As I pointed out in a former paper, this...
Página 455 - The idea that the spermatozoon and the substances which cause parthenogenesis act only catalytically, has a great, bearing upon the theory of life phenomena. It means that if we accelerate the processes of cell-division in the mature egg (by specific catalyzers) the egg can live; but if these processes occur too slowly at the ordinary temperature (as is the case in the unfertilized egg in normal sea-water), the egg dies. The introduction of the catalytic substances which accelerate the processes...
Página 49 - ... hours after rising, reaching a minimum after breakfast. When lean beef sufficient to furnish about 63.7 grams of extra protein was taken with breakfast, the nitrogen began to rise in the first three hours and reached a maximum between the sixth and ninth hours, after which it declined at first rapidly and then more slowly, reaching the normal after about 36 to 39 hours.