The Journal of Physiology, Volume 56Cambridge University Press, 1922 |
Table des matières
| 1 | |
| 19 | |
| 42 | |
| 53 | |
| 69 | |
| 101 | |
| 110 | |
| 120 | |
| 283 | |
| 294 | |
| 301 | |
| 331 | |
| 340 | |
| 348 | |
| 353 | |
| 359 | |
| 146 | |
| 157 | |
| 179 | |
| 190 | |
| 201 | |
| 206 | |
| 227 | |
| 248 | |
| 259 | |
| 269 | |
| 275 | |
| 367 | |
| 382 | |
| 397 | |
| 404 | |
| 413 | |
| 421 | |
| 444 | |
| 451 | |
| 459 | |
| xliii | |
Autres éditions - Tout afficher
Expressions et termes fréquents
A. V. Hill action adrenaline afferent nerve alkaline alveoli amount animal arterial blood arterial pressure asphyxia Barcroft bicarbonate blood flow blood-pressure c.mms calculated cannula capillaries cause secretion cells chloride circulation rate CO₂ CO2-pressure concentration contraction coronary circulation corpuscles denervated determined dilatation dissociation curve effect electrodes excitability excreted experiments expired air foot fore frog galvanometer gland glomerulus glucose hæmoglobin heart heat-production hind histamine impulse increase injected interval ions Journ kidney lactic acid mechanical method mgrms mid pad minutes mixture motor nerve muscle normal observed obtained oxygen oxygen-pressure p.c. adrenaline percentage utilisation perfusion Physiol pilocarpine plasma posterior roots produced rabbit reaction reflex relation respiration respiratory Ringer's fluid saliva saturation sciatic sciatic nerve secretory shown slight sodium solution spinal stimulation substance sugar sulphate sweat sympathetic Table temperature tion tissues tubule urea ureter uric acid urine varying venous blood veratrine
Fréquemment cités
Page 40 - From this the mechanical efficiency W/H may be calculated as a function of the duration of the contraction, and it is shown that there is a certain optimum speed of movement below which the efficiency falls slowly, and above which it falls rapidly. (7) The mechanical efficiency of a submaximal effort is always less than that of a maximal effort occupying the same time, and in general the stronger effort is the more efficient. Moreover the stronger effort has the greater optimum speed. (8) The bearing...
Page 18 - ... calculation for the double transition (2P)2 may perhaps show even closer accord with the experimental value. Some of the initial work in these experiments was carried out by Mr. T. Emmerson, while in receipt of a grant from the Department of Scientific and Industrial Research. Our thanks are here recorded. We have also to thank the Government Grant Committee of the Royal Society for a grant to the senior author, out of which was purchased the photometer. Summary. . Electrons of energy between...
Page 412 - ... formulation of the following hypothesis: — During the periods between nuclear division, each nucleus retains the charge of autocatalyst with which it was originally provided, and adds to it in the course of the nuclear synthesis which is rendered possible by its presence. At the next division the autocatalyst is shared between the nuclear materials and the surrounding medium in a proportion determined, in part by its relative solubility in the two media, and in part by its affinity for chemical...
Page 28 - ... infinitely great mass, it will be very slow, and practically the whole of the mechanical energy will be realised as work; if however the mass providing the reaction be finite, the change of form will proceed at a finite rate, and a finite proportion of the mechanical energy will be degraded into beat; only the remainder, W, say, being realised as work. Thus (W0 - W) is equal to the energy dissipated in the shortening, which, from above, we should expect to be proportional to the velocity with...
Page 410 - It does not appear possible to interpret this fact except by supposing that during the process of division the nucleus has lost some constituent which was responsible for the high rate of nuclear growth just before division occurred. We are thus led to the formulation of the following hypothesis: During the periods between nuclear divisions, each nucleus retains the charge of autocatalyst with which it was originally provided and adds to it in the course of the nuclear synthesis which is rendered...
Page 405 - ... evident that the population attained in these cultures in 44 hours was very nearly inversely proportional to their volume, and if in the A series a volume of about 1-5 cc, or in the B series about 0-15 cc, had been employed, we may infer that no multiplication at all would have occurred. As a matter of fact, single individuals isolated into volumes exceeding 1 cc very rarely survive, and failures to reproduce on the part of individuals isolated into cultures exceeding 0-1 cc in volume are not...
Page x - The Influence of Rest Pauses and Changes of Posture on the Capacity for Muscular Work, Industrial Fatigue Research Board, Report 36: 28-55, London, 1924.
Page 452 - X. — POLEMON. I stated in Ilios, p. 168, by mistake, that Polemon, who lived at the end of the third and at the beginning of the second century BC, who was therefore older than Demetrius of Scepsis, and who wrote a descrip* Idyll. VI. verse 39 : us n^i ftMKav&ia Sf, rpls (is (p.uv fTTuffa ( t M«Vi7nroy T) NeKuo/MU'TCio, p. 465 : /i€Ta 8...
Page 27 - ... men's curve, it is possible then to construct the women's curve as follows. With an equivalent mass of 50 kg a man can do just as many kilogram-metres of work, as a woman with 50 half-kg can do half-kilogram-metres of work; with 100 kg a man can do as many kilogram-metres as a woman with 100 half-kg can do half-kilogram-metres; and so on. Working with this rule the points shown with circles on the women's curve have been calculated from the men's curve. The agreement is perfect. Thus to a healthy...
Page 40 - This hypothesis leads to the preceding mathematical relations, and is in keeping with what is known as to the "thermo-elastic" properties of muscle. (5) An instrument is described enabling a continuous record to be deduced of the relation between the work done and the distance pulled, in the course of a single contraction. Curves are given showing this relation for a variety of loads. (6) The mechanical efficiency of human voluntary movement is discussed. It is shown that the total energy H set free...