共查询到20条相似文献,搜索用时 15 毫秒
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J. A. Firth 《Cellular and molecular life sciences : CMLS》1977,33(8):1093-1094
Summary Phosphatase activity identified with Na+–K+-ATPase was localized at the basal surface of cerebral cortical capillary endothelium by perfusion with a p-nitrophenyl phosphate-strontium medium. The relationship of this to the blood-brain barrier to K+ is discussed. 相似文献
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J A Firth 《Experientia》1977,33(8):1093-1094
Phosphatase activity identified with Na+-K+-ATPase was localized at the basal surface of cerebral cortical capillary endothelium by perfusion with a p-nitrophenyl phosphate-strontium medium. The relationship of this to the blood-brain barrier to K+ is discussed. 相似文献
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Resumen Se han estudiado los depósitos de catecol- e indolaminas en la tiroides de la oveja mediante una técnica citoquímica que permite la diferenciación entre ambos compuestos a nivel ultraestructural. Los abundantes mastocitos hallados en la glándula presentan granulaciones que contienen una catecolamina, que en base a estudios anteriores se identificó como dopamina. Las células parafoliculares en cambio, contienen serotonina en los gránulos citoplasmáticos. Dichos gránulos, cuya presencia ha sido vinculada con la de la tirocalcitonina, son por lo tanto capaces de almacenar la hormona y la 5-hidroxitriptamina. Los resultados citoquímicos se analizan conjuntamente con los obtenidos mediante la determinación química del contenido en aminas de la glándula.
The kind cooperation of Dr.F. Iturriza and Dr.J. López Aranguren and the technical assistance of Mrs.Cristina Llorente andR. Castelli are gratefully acknowledged. Supported by grants from the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina and U.S. Air Force (AF-AFOSR 963-67). 相似文献
The kind cooperation of Dr.F. Iturriza and Dr.J. López Aranguren and the technical assistance of Mrs.Cristina Llorente andR. Castelli are gratefully acknowledged. Supported by grants from the Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina and U.S. Air Force (AF-AFOSR 963-67). 相似文献
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Zusammenfassung Die Wurzelspitzen und meiotischen Prophasezellen normaler und asynaptischer Pflanzen vonPhaseolus mungo wurden nach Azetylierung oder Desaminierung der Histone mit alkalischem Fastgreen, Bromphenolblau und Eosin Y gefärbt. Die asynaptischen Mutanten ergaben einen erhöhten Wert an labilen lysinreichen Kernhistonen. 相似文献
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R. Pageau 《Cellular and molecular life sciences : CMLS》1971,27(11):1328-1329
Résumé L'effet de la présence deM. laidlawii sur la sensibilité aux rayons-X des cellules provenant d'un glioblastome de rat a été étudié. Aucune différence significative n'a pu être mise en évidence entre la radiosensibilité des cellules infectées et celle des cellules saines. Ces résultats sont discutés en tenant compte des donnés bibliographiques.
This research was supported by a grant No. CA-07368 from the National Institutes of Health. The culturing and identification ofM. laidlawii was made by Dr.L. Dienes. 相似文献
This research was supported by a grant No. CA-07368 from the National Institutes of Health. The culturing and identification ofM. laidlawii was made by Dr.L. Dienes. 相似文献
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F. Dentice di Accadia Olga Gribanovski-Sassu Nancy Lozano Reyes 《Cellular and molecular life sciences : CMLS》1968,24(11):1177-1179
Riassunto È studiato l'effetto di arrossamento provocato dall'aggiunta di alcuni zuccheri a colture sommerse dell'alga cloroficeaD. cinnabarinus. Questo effetto è dovuto alla formazione di cheto-carotenoidi, alla diminuzione delle clorofille ed alla degradazione dei cloroplasti. Le osservazioni al microscopio elettronico mettono in evidenza le variazioni della struttura dei cloroplasti. 相似文献
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Summary Carbohydrates and modified derivatives of D-galactose have been studied for their capacity to inhibit the hemagglutination of human erythrocytes by mistletoe lectin I. Inhibition data suggest that unmodified hydroxyl groups at the C-2, C-3, and C-4 position of the D-galactopyranosyl ring are essential for binding to the active sites of the lectin. 相似文献
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Surface-feeding fish accurately determine direction and distance to the center of a concentric wave stimulus, even if only a single, short lasting wave train is presented. It has been suggested that one cue used by these fish to localize the wave center is the distance dependent frequency modulation of the initial part of a wave stimulus. Here we show how the distance information contained in the fractional frequency change of a capillary wave group can be decoded. We suggest that wave source localization in surface-feeding fish in part is based on a principal similar to that used by oceanographers to track storms by the frequency change of forerunners of swell. 相似文献
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Summary Surface-feeding fish accurately determine direction and distance to the center of a concentric wave stimulus, even if only a single, short lasting wave train is presented1,2. It has been suggested that one cue used by these fish to localize the wave center is the distance dependent frequency modulation of the initial part of a wave stimulus3,4. Here we show how the distance information contained in the fractional frequency change of a capillary wave group can be decoded. We suggest that wave source localization in surface-feeding fish in part is based on a principal similar to that used by oceanographers to track storms by the frequency change of forerunners of swell. 相似文献
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Resumen En la superficie libre, en contacto con la sangre materna, del sinciciotrofoblasto de la placenta humana se observó un glicocáliz en el que se han caracterizado carbohidratos complejos, grupos sulfato y ácido siálico. En este glicocáliz se observaron cambios citoquímicos con la edad de la placenta. Con el microscopio electrónico, se describe la apariencia filamentosa del glicocáliz de placenta humana. 相似文献