摘要:

Zusammenfassung.Bei vier gesunden männlichen Versuchspersonen hatte 3 g Borsäure, täglich während 11–16 Tage genommen, keinen Einfluss auf den Standardstoffwe

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02046.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

Summary.1. The speed of absorption of calcium in rats is influenced by the levels of calcium in the diet; but only as long as the skeleton is kept unsaturated with calcium salts from an early age.2. Calcium starvation in adult rats and in pregnancy does not increase the speed of absorption of calcium.3. Thymus and the gonads do not appear to influence the absorption of Ca.

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02047.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

Summary.Injections of citric acid will not cure rickets in rats. Ca subnourishment depresses the citric acid content of the bones but only in proportion to the reduction of the ash content.In vitamin D deficient rats the citric acid content of the bones is greatly reduced, but in disproportion to the decrease of the ash content. The ratio ash/citric acid in the experiments here reported was about doubled.

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02048.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02049.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

Summary.The micro‐electrode technique has been used for the recording of spikes of activity from the retina of the cat in order to study the distribution of sensitivity to spectral light of the retinal elements.In dark‐adapted cats the distribution of sensitivity corresponds to the absorption curve for visual purple.In light‐adapted cats some elements give the broad so‐called photopic dominator band with maximum in 0.560 μ, others a narrow curve with maximum in 0.520 μ combined with the dominator in different ratios.The narrow curve is probably identical with the band seen in the eyes of rats and guinea pigs corresponding to an abnormally narrow absorption curve for visual purple, in the cat shifted somewhat to the right because of the added effect of the dominator.Some results indicate that back reflexion from the tapetum lucidurn plays a ro1e in determining the shape of the curves in the yellow‐green region of the spectrum.The colour vision of the cat has been, discussed in the light of the results

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02050.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

Summary.In 11 Versuchen an 7 gesunden Versuchspersonen wurde die Wirkung von Pervitin auf Kreislauf und Atmung untersucht. Pervitin wurde in intrainuskulärer Injektion in einer Dosis von 15 mg. per 70 kg. Körpergewicht gegeben. Das Herzminutenvolumen wurde mittels der Acetylenmethode von GROLLMAN bestimrnt.Eine halbe Stunde nach der Injektion wurde eine Steigerung des Herzminutenvolumens von 39 % des Normalwertes festgestellt, die nach 1 und l½ Stunde immer noch etwa 20 % ausmachte. Der Sauerstoffverbrauch stieg mässig. Die Ventilation und der respiratorische Quotient wurden in den meisten Fällen nicht beeinflusst, aber zwei der Versuchspersonen reagierten mit einer kräftigen Hyperventilation und einer Steigerung des Quotienten bis

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02051.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

Summary.Labelled phosphate is administered to adult rats by subcutaneous injection. After the lapse of 4 days, the rats are killed and the desoxyribose nucleic acid present in different organs is extracted. By comparing the activity of 1 mg desoxyribose nucleic acid P with the activity of I mg cellular inorganic P of the same organ, data on the percentage renewal of the desoxyribose nucleic acid present in the organs are obtained.In the course of 4 days, only a minor part of the desoxyribose nucleic acid present in all the organs investigated is found to be labelled, i. e. renewed. The greatest daily renewal of nucleic acid (15 per cent) takes place in the mucosa of the small intestine. This is followed by the spleen (5.8 per cent), the testes (2.6 per cent), the muscles (1.9 per cent), and the liver (1.0 percent). The lowest figures are shown by the kidneys and the brain (0.6 per cent).

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02052.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

Summary.A number of experiments on the effects and toxicity of dimethyl sulfide, dimethyl disulfide and methyl mercaptan on rats are described. The effects of these sulfides are mainly the same as those of hydrogen sulfide. The toxicity, estimated from the concentration necessary to kill a rat in about 15 minutes, decreases in the order hydrogen sulfide ‐ dimethyl disulfide ‐ methylmercaptan ‐ dimethyl su

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02053.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

Summary.The propagation of contraction over the isolated muscle fibre is measured by the changes in the cross striation, i. e. shortening of the anisotropic (A) and lengthening of the isotropic (I) substance being used as indicator. Simultaneous microcinematography (100 Pictures/sec.) of two points of the isometrically placed fibre shows a phase difference in the course of the changes in cross striation, which corresponds to a propagation rate of 0.32 m/sec ±±0.016 (20° C). The change in the cross striation is transmitted through the fibre without decrement. Dependent on the distance between point of measurement and point of stimulation, an increase in height of compartment is found so long as the contraction has not reached the fibre elements under observation.The rate of propagation of contraction is essentially lower than that of the spread of action potential (excitation potential). The influence of propagation velocity on the course of the mechanical tension developed, and on the latent period, are discuss

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02054.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

Summary.The theoretical basis of correcting for counting losses in a simple GEIGER‐MÜLLER counting arrangement is outlined and a convenient procedure for carrying out the correction is present

ISSN:0001-6772    

DOI:10.1111/j.1748-1716.1943.tb02055.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY