共查询到20条相似文献,搜索用时 31 毫秒
1.
G. Giardina 《Cellular and molecular life sciences : CMLS》1954,10(5):215-215
Riassunto Sono state studiate le variazioni del rapporto tra l'N proteico e non proteico in segmenti rigeneranti, nucleati ed anucleati, diAcetabul. medit. I risultati ottenuti hanno dimostrato che il predetto rapporto aumenta in entrambi i segmenti il primo giorno dopo l'operazione. Nei giorni seguenti esso diminuisce in entrambi i segmenti, ma più sensibilmente in quelli anucleati, nei quali va al di sotto del valore medio delle alghe normali già dopo il 3°–4° giorno. 相似文献
2.
J. Hubertha Bijtel 《Cellular and molecular life sciences : CMLS》1960,16(2):74-75
Zusammenfassung Vom ektodermalen Proctodaeum wächst ein kleiner Divertikel dem Vornierengang entgegen und vereinigt sich mit dessen kaudalem Ende. Einen weiteren Anteil hat das Proctodaeum an der Bildung des Vornierenganges nicht. Zugleich mit dem Proctodaeum invaginiert Material für den Mesonephros, das sich in Zellgruppen entlang dem hinteren Ende des Vornierenganges lagert. 相似文献
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C. R. Pace-Asciak N. S. Edwards M. C. Carrara 《Cellular and molecular life sciences : CMLS》1980,36(6):635-637
Summary Tritium-labelled PGF2 was administered i.v. into rats of varying ages (2, 4, 6 weeks and adult). Urine was collected and assayed for radioactive products by thin-layer-chromatography. Results showed a distinctly different urinary profile between the 2-week-old and the adult rat. While the urinary pattern from the 2-week-old rat gave a single less polar product than PGF2, the pattern from the adult rat gave products more polar than PGF2. Urine from the 4- and 6-week-old rats gave a mixture of these types of products. These results indicate that some prostaglandin catabolic pathway (likely the -oxidative system) is activated in vivo within the 4–6-week postnatal period in the rat.Supported by a grant (MT-4181) to C.P.-A. from the Medical Research Council of Canada.This study is in partial fulfillment of the requirements for a Ph.D. degree in the Department of Pharmacology, University of Toronto. 相似文献
4.
George Abraham 《Archive for History of Exact Sciences》1986,35(4):325-328
Summary Formulae are fitted to the different sets of values, given by the translators, for the equation of centre for the motion of the moon according to the Romaka Siddhnta, as found in the Pañcasiddhntik of Varha Mihira. 相似文献
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A. A. Bothner-By R. F. Dawson D. R. Christman 《Cellular and molecular life sciences : CMLS》1956,12(4):151-152
Zusammenfassung Gibt man L(+)-Lysin--15N oder in allen Stellungen mit14C markiertes L(+)-Lysin zu keimfreien Kulturen von abgeschnittenen Wurzeln vonNicotiana tabacum, so erzeugen die Wurzeln Nikotin, welches kleine Mengen15N oder14C enthält. Ferner enthält das Nikotin mehr15N oder14C im Pyrrolidinring als im Pyridinring. Lysin liegt daher nicht auf dem direkten biogenetischen Weg zum Nikotin.
Research performed under the auspices of the United States Atomic Energy Commission. 相似文献
Research performed under the auspices of the United States Atomic Energy Commission. 相似文献
6.
K. Ostrowski J. Komender H. Kościanek K. Kwarecki 《Cellular and molecular life sciences : CMLS》1962,18(3):142-144
Résumé Les auteurs ont examiné les possibilités de diminution du contenu en azote et phosphore et de la masse sèche au cours de la congelation-dissolution des tissus. La diminution la plus marquée a été observée après l'usage de méthanol. Tandis qu'avec l'acétone elle est insignifiante. 相似文献
7.
V. Varagić M. Krstić S. Stepanović S. Hajduković 《Cellular and molecular life sciences : CMLS》1963,19(12):647-648
Résumé 24 et 48 h après irradiation- (900 r) la quantité de 5-hydroxytryptamine dans l'intestin du rat n'a pas changé de manière significative. La quantité de 5-hydroxytryptamine dans la rate du rat, exprimée par g de tissu frais a augmenté. Le prétraitement avec de la cystéamine abaisse nettement la quantité de 5-hydroxytryptamine dans la rate, après l'irradiation. 相似文献
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K. Arishima S. Nakama Y. Morikawa Y. Hashimoto Y. Eguchi 《Cellular and molecular life sciences : CMLS》1978,34(2):262-263
Summary Radioactivity in the fetal plasma 1 h after maternal injection of14C-4-corticosterone or14C-4-estradiol-17 on day 21 of gestation was markedly higher than that 1 h after injection on day 22. Radioactivity in the maternal plasma was not different on these 2 days. The results suggest that the placental permeability to steroids from the mother to the fetus declines toward the end of gestation in the rat.Acknowledgment. We are indebted to Professor Tatsuo Imori (Department of Veterinary Surgery, College of Agriculture, University of Osaka Prefecture) for his valuable suggestions during the course of this study. 相似文献
11.
Summary Plasma estradiol-17 (E2) concentration was measured in 5 adult non-pregnant rabbits each in 3 different seasons (January, April and September). Blood samples were taken from each rabbit every other day. There was a considerable variation in plasma E2 levels from one sampling day to another, irrespective of the season. The pattern of variation in E2 levels in individual rabbits tended to be cyclic and this cycle was roughly of the order of 8 days. There was no correlation between changes in E2 levels and those in the vaginal appearance. *** DIRECT SUPPORT *** A2025089 00013This study was supported by the Ford Foundation, and the Swedish Medical Research Council (project No. 4781). 相似文献
12.
Summary Direct incorporation and cold trap experiments suggest that cholest-4-en-3-one is an intermediate in the conversion of cholesterol into 3-hydroxymethyl-A-nor-cholestane in the marine spongeAxinella verrucosa. Cholest-4-en-3-one is further transformed by the sponge into cholest-4-en-3-ol, 5-cholestan-3-one and 5-cholestan-3-ol; these compounds arise from side reactions, which are not part of the major metabolic route leading to 3-hydroxymethyl-A-norsteranes. 相似文献
13.
S. S. Guraya 《Cellular and molecular life sciences : CMLS》1962,18(4):167-168
Résumé L'examen histochimique des spermatides du bouc et du buffle montre que le «complexe de Golgi» des auteurs comprend l'idiosome constitué par des protéides et des lipidoprotéides, les bâtonnets et granules constitués par des phospholipides et peut-être des protéides et enfin les vacuoles. 相似文献
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The Intergovernmental Panel on Climate Change (IPCC) has, in its most recent Assessment Report (AR5), articulated guidelines for evaluating and communicating uncertainty that include a qualitative scale of confidence. We examine one factor included in that scale: the “degree of agreement.” Some discussions of the degree of agreement in AR5 suggest that the IPCC is employing a consensus-oriented social epistemology. We consider the application of the degree of agreement factor in practice in AR5. Our findings, though based on a limited examination, suggest that agreement attributions do not so much track the overall consensus among investigators as the degree to which relevant research findings substantively converge in offering support for IPCC claims. We articulate a principle guiding confidence attributions in AR5 that centers not on consensus but on the notion of support. In concluding, we tentatively suggest a pluralist approach to the notion of support. 相似文献
16.
A. Iatrou G. Kenis B. P. F. Rutten K. Lunnon D. L. A. van den Hove 《Cellular and molecular life sciences : CMLS》2017,74(3):509-523
Even though the etiology of Alzheimer’s disease (AD) remains unknown, it is suggested that an interplay among genetic, epigenetic and environmental factors is involved. An increasing body of evidence pinpoints that dysregulation in the epigenetic machinery plays a role in AD. Recent developments in genomic technologies have allowed for high throughput interrogation of the epigenome, and epigenome-wide association studies have already identified unique epigenetic signatures for AD in the cortex. Considerable evidence suggests that early dysregulation in the brainstem, more specifically in the raphe nuclei and the locus coeruleus, accounts for the most incipient, non-cognitive symptomatology, indicating a potential causal relationship with the pathogenesis of AD. Here we review the advancements in epigenomic technologies and their application to the AD research field, particularly with relevance to the brainstem. In this respect, we propose the assessment of epigenetic signatures in the brainstem as the cornerstone of interrogating causality in AD. Understanding how epigenetic dysregulation in the brainstem contributes to AD susceptibility could be of pivotal importance for understanding the etiology of the disease and for the development of novel diagnostic and therapeutic strategies. 相似文献
17.
Jeroen van Dongen 《Archive for History of Exact Sciences》2009,63(6):655-663
This article discusses new material, published in volume 12 of the Collected Papers of Albert Einstein, that addresses Einstein’s
knowledge of the Michelson–Morley experiment prior to 1905: in a lecture in Chicago in 1921, Einstein referred to the experiment,
mentioned when he came upon it and hinted at its influence. Arguments are presented to explain the contrast with Einstein’s
later pronouncements on the role of the experiment. 相似文献
18.
We investigate the debate between Walter Ritz and Albert Einstein on the origin and nature of the radiation asymmetry. We argue that Ritz׳s views on the radiation asymmetry were far richer and nuanced than the oft-cited joint letter with Einstein (Ritz & Einstein, 1909) suggests, and that Einstein׳s views in 1909 on the asymmetry are far more ambiguous than is commonly recognized. Indeed, there is strong evidence that Einstein ultimately came to agree with Ritz that elementary radiation processes in classical electrodynamics are non-symmetric and fully retarded. 相似文献
19.
N. K. McCallum A. Gugelmann C. A. M. Brenninkmeijer R. Mechoulam 《Cellular and molecular life sciences : CMLS》1977,33(8):1012-1014
Summary Isotope effect studies on the metabolic dehydrogenation of 1-tetrahydrocannabinol in rats are described and its is shown that this process is confined to a very short period following i.v. administration. The implications of this finding are discussed.The authors are grateful for generous fifts of3H-1-THC from Dr S. Burstein (Worcester Foundation for Experimental Biology, Massachusetts), and of14C-1-THC from the National Institute on Drug Abuse. The authors thank the staff of the Small Animal Unit, Wallaceville Research Centre for their cooperation, and the U.S. National Institute on Drug Abuse for their support. 相似文献
20.
Differences in the tissue content of prothymosin during the early postnatal development of male and female rats are reported. Thymus and spleen have been found to contain significantly higher amounts of prothymosin in the newborn and prepubertal animals, as compared to adults, whereas liver has been found to contain low levels of prothymosin throughout development. These findings indicate a functional association of prothymosin with the proliferating lymphoid tissues of the young rat. 相似文献