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Summary An SH reactive agent, N-ethyl maleimide (10–3 M for 2 min in the luminal fluid) selectively inhibits the urea transpithelial flux across the toad gall bladder. Thiourea and antipyrine flux is not inhibited. The inhibitory effect on urea flux seems to be exerted on the carrier mechanism of urea transport. 相似文献
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Summary Pre- and simultaneous treatments ofVicia faba root tip meristems with urea and ethyl alcohol, mitomycin C, maleic hydrazide,3H-thymidine and X-rays, respectively, were found to result in mutagen-specific changes of the spectrum and yield of induced chromatid aberrations. 相似文献
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P. -M. Lenicque M. R. Paris M. Poulot 《Cellular and molecular life sciences : CMLS》1972,28(11):1399-1400
Résumé Une méthode simple d'analyse biologique des effects toxiques des substances de la série des cannainoïdes est présentée. Avec cette méthode, il est montré que les tetrahydrocannabinols 1 et 6 ainsi que le cannabidiol agissent sur le métabolisme de la sérotonine. 相似文献
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The effects of some GABAergic agents on seizures induced by quinine were studied in mice. Muscimol, AOAA, DABA and baclofen significantly protected mice against quinine-induced convulsions. Bicuculline effectively enhanced quinine-induced convulsions, and significantly attenuated the protective effects of muscimol, AOAA and DABA against convulsions induced by quinine. Diazepam and phenobarbitone significantly protected mice against convulsions induced by quinine. However, phenytoin did not affect quinine-induced seizures to any significant degree. These results indicate that the convulsant effect of quinine may be due to a disturbance in the status of the GABAergic system. 相似文献
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Zusammenfassung Substanzen, welche die thrombin-induzierte Plättchenaggregation hemmen, lassen sich in drei Hauptgruppen aufteilen: 1. membranstabilisierende Steroide, 2. Substanzen, welche die elektrischen Eigenschaften der Membran oder die Permeabilität oder beide beeinflussen, und 3. Substanzen, die eine Erhöhung des intrazellulären cAMP-Spiegels bewirken sollen. Eine Hypothese über die Hemmung der Plättchenaggregation durch Thrombin wird vorgeschlagen.
Supported in part by Grants No. HE-01648 and No. HE-06350 from the National Heart and Lung Institute. Dr.Mason is a Markle Scholar in Academic Medicine and an N.I.H. Career Development Awardee. 相似文献
Supported in part by Grants No. HE-01648 and No. HE-06350 from the National Heart and Lung Institute. Dr.Mason is a Markle Scholar in Academic Medicine and an N.I.H. Career Development Awardee. 相似文献
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The effects of some GABAergic agents on seizures induced by quinine were studied in mice. Muscimol, AOAA, DABA and baclofen significantly protected mice against quinine-induced convulsions. Bicuculline effectively enhanced quinine-induced convulsions, and significantly attenuated the protective effects of muscimol, AOAA and DABA against convulsions induced by quinine. Diazepam and phenobarbitone significantly protected mice against convulsions induced by quinine. However, phenytoin did not affect quinine-induced seizures to any significant degree. These results indicate that the convulsant effect of quinine may be due to a disturbance in the status of the GABAergic system. 相似文献
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B. Matkovics L. Lakatos L. Szabó L. Karmazsin 《Cellular and molecular life sciences : CMLS》1981,37(1):79-80
Summary In the liver of neonate rats and in tissues of adult rats a study was made of the effect of D-penicillamine treatment in vivo on the enzymes of peroxide metabolism, lipid peroxidation and other components. It was found that D-penicillamine primarily acts by decreasing lipid peroxidation, thus stabilizing the membrane.Properties of enzymes. Serial publication Part XVI.Acknowledgment. We should like to take the opportunity to express our thanks to the Directorate of Knoll AG, Ludwigshafen. FRG, for the kind gift of Metalcaptase®. 相似文献
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S. R. Philips G. B. Baker H. R. McKim 《Cellular and molecular life sciences : CMLS》1980,36(2):241-242
Summary Concentrations of 4 trace amines in diencephalon and hippocampus of the rat were measured by integrated-ioncurrent mass spectrometry after administration of the antidepressant drug, tranylcypromine. Much larger increases were observed for 2-phenylethylamine and tryptamine than for m- and p-tyramine.Financial support has been provided by the Medical Research Council of Canada, the Psychiatric Services Branch, Province of Saskatchewan, the Alberta Mental health Research Fund, and the Special Services and Research Committee, University of Alberta Hospital.Acknowledgments. The authors wish to thank Dr B.A. Davis for synthesizing the deuterated internal standards and Dr D.A. Durden for supervising the mass spectral analyses. Expert technical assistance was provided by Mr R.C. Mag-Atas and Ms D.G. Calverley. The advice and encouragement of Professors W. G. Dewhurst and A. A. Boulton are gratefully acknowledged. 相似文献
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J. W. Constantine 《Cellular and molecular life sciences : CMLS》1964,20(7):381-382
Zusammenfassung Inkubation von 1-l-Asparaginyl-5-l-valyl-angiotensin II (Angiotensinamid) mit Harnstoff vermindert die spasmolytische Aktivität des Polypeptides weder am Meerschweinchenileum noch am Uterus der Ratte. Eine durch Wasserstoffbrückenbindungen stabilisierte räumliche Konfiguration des Polypeptids ist daher anscheinend nicht Voraussetzung für biologische Aktivität. 相似文献
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J. A. Kiernan 《Cellular and molecular life sciences : CMLS》1972,28(6):653-655
Résumé Des suspensions de mastocytes péritoneaux isolées de rat furent incubées avec 10 substances différentes, connues ou presumées être des neurotransmitteurs. Seulement l'adenos ine triphosphate (ATP) aux concentrations supérieures à 2.64×10–6
M causèrent la dégranulation des mastocytes. L'ATP cause également la dégranulation des mastocytes dans le mésentère. L'action de l'ATP peut être responsible de la dégranulation des mastocytes cutanées observée après la stimulation antidromique des nerfs sensorieux, alors que de l'ATP est libéré dans la peau. 相似文献
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John S. Cook 《Cellular and molecular life sciences : CMLS》1956,12(9):349-350
Zusammenfassung Die marklosen Nerven-Einzelfasern vonCarcinus maenas wurden mit monochromatischem Ultraviolett bestrahlt. Zuerst tritt bei Bestrahlung ein langsamer Abfall der Reizschwelle, dann ein rascher Abfall, gefolgt von einem steilen Anstieg auf. Der Abfall rührt von einer Depolarisation her, deren Zunahme dann zu Unerregbarkeit führt. Durch Verbesserung der Ableitungstechnik konnten die elektrischen Veränderungen lokalisiert an der bestrahlten Stelle gemessen werden. Anstieg der Reizschwelle, Abfall der Steilheit und Abfall der Höhe des Spitzenpotentials wurden auch bei diesen marklosen Fasern beobachtet, aber nicht so ausgeprägt wie bei der Bestrahlung markhaltiger Fasern.
This work was carried out during the tenure of a Postdoctoral fellowship from the United States Public Health Service. 相似文献
This work was carried out during the tenure of a Postdoctoral fellowship from the United States Public Health Service. 相似文献
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N S Latman 《Experientia》1987,43(1):32-38
There appears to be ample evidence to conclude that various meteorological factors do exert a significant impact on some people with various rheumatic diseases. The data is, however, crude relative to our general understanding. Most of this research on RA has dealt with the primary signs and symptoms of inflammation. We know, however, many of the chemical mediators of inflammation. It seems like a logical progression of research to determine the effects of the meteorological/atmospheric factors of concern on these specific intrinsic mediators of inflammation. In general, gout can be very well controlled through medication. The evidence suggests, however, that we may gain a much better understanding of how atmospheric factors such as temperature can effect the body through changes in its physico-chemical processes by using Gout as a model. The work with SLE has already yielded useful applications. Sun screening pharmaceuticals have been quite successful in reducing exacerbations of symptoms. But we don't know why only some people are photosensitive. The previous research on the effects of atmospheric factors on the rheumatic diseases has illustrated key issues in methodology: large sample sizes are critical, objective and quantifiable disease variables are important, the variables measured must be specific to the questions investigated, the diseases investigated must be as specifically and accurately defined as possible, and the various aspects of 'weather' to be investigated must be specifically defined and quantified. It is apparent that there is much more important and useful work to be performed before we can understand the effects of atmospheric factors on the rheumatic diseases. 相似文献