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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 9 (1961), S. 143-146 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 7 (1959), S. 712-714 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 53 (1997), S. 122-124 
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The E. coli protein RuvA (resistance to ultraviolet light) has been overexpressed in E. coli, purified and crystallized using the hanging-drop vapour-diffusion method with sodium chloride as the precipitant. The crystals, which diffract to beyond 1.9 Å, belong to the tetragonal system, space group P4 with unit-cell dimensions of a = 83.7, c = 33.1 Å with a monomer in the asymmetric unit. RuvA is known to be a tetramer and thus the crystal symmetry implies that its quaternary structure will be based on fourfold rotation symmetry rather than 222 symmetry. This is consistent with electron microscopy data on Holliday junction DNA complexes and implies that the arms of the four DNA duplexes involved in recombination adopt fourfold rotation symmetry.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1433-2981
    Keywords: Cerebral malaria ; Cytokines ; Macaca mulatta ; Macrophages ; Parasitised erythrocytes ; Plasmodium knowlesi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To assess the interaction between the cellular elements of the blood and neurovascular endothelia in cerebral malaria, brain tissue from adult rhesus moneys (Macaca mulatta) infected with a virulent (W1) strain of Plasmodium knowlesi were studied by light and electron microscopical techniques. Light microscopical examination showed sequestration of macrophages and margination of erythrocytes containing late stages of the parasite in the capillaries and venules throughout the brains of the infected monkeys. Brain microvascular lesions (associated with parasitised erythrocytes and macrophage attachment to vascular walls) seen with the electron microscope, were swelling of the endothelial cells, formation of pseudopodia, increased numbers of pinocytotic vesicles and disorganisation of the mitochondria. Parasitised mature erythrocytes and macrophages adhered to the vascular endothelial lining in equal proportions. The endothelial ultrastructural alterations were similar to those described in experimental rodent and in clinical human cerebral malaria.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 50 (1962), S. 507-512 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die halb quantitative Schätzung von Eisen(III) und Nickel im Ultramikromaßstab auf der Grundlage des Niederschlagsvolumens wurde ausgearbeitet. Eine Reihe Fällungsmittel für beide Ionenarten wurden geprüft. Kaliumcyanoferrat(II) für Eisen(III) und Dimethylglyoxim für Nickel bewährten sich am besten. Die maximalen und minimalen Mengen der beiden Elemente waren l μg bzw. 0,1 μg. Die Inkonstanz der Niederschlagsvolumina schwankt zwischen 4,7 und 29,8%. Die statistische Untersuchung der Resultate bestätigte, daß die Teilchengröße der Niederschläge die Genauigkeit unter der Voraussetzung beeinflußt, daß das Absetzen und die Bedingungen der Niederschlagsbildung konstant gehalten werden.
    Abstract: Résumé On a réalisé l'estimation semiquantitative du fer ferrique et du nickel, à l'échelle ultra-micro, en se servant du volume des précipités comme indication de la quantité d'ions présents dans la solution. On a examiné un certain nombre d'agents de précipitation pour chacun de ces deux ions. Les réactifs les plus satisfaisants ont été le ferrocyanure de potassium pour l'ion ferrique et la diméthylglyoxime pour le nickel. Les quantités maximale et minimale des éléments utilisés étaient respectivement de 1 μg et de 0,1 μg. Le coefficient de variation des volumes variait de 4,7 à 29,8%. Une étude statistique de quelques uns des résultats a confirmé que le volume du précipité affecte la précision du dosage, à condition que le tassement et les conditions dans lesquelles la précipitation se produit, restent constants.
    Notes: Summary The semi-quantitative estimation of ferric iron and nickel on the ultra-micro scale using the Volume of the precipitates as an indication of the amount of ions present in solution has been carried out. A number of precipitants for each of these two ions were examined. Potassium ferrocyanide for ferric iron and dimethylglyoxime for nickel were the most satisfactory reagents. The maximum and minimum amounts of the elements used were 1 μg and 0.1 μg, respectively. The coefficient of variation of volumes varied from 4.7% to 29.8%. A statistical study was carried out on some of the results and confirms that the bulkiness of the precipitate affects the accuracy of the determination, provided that the packing and the conditions under which precipitation takes place are kept constant.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 50 (1962), S. 254-264 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A study was made of the behavior of the carrier-free radioelements90Sr and90Y in the elution of cation- and anion exchange columns with solutions containing rhodizonic acid in that activity measurements were made on fractions of the eluate and, after completion of the elution, on sections of the exchange column. The findings indicate that anionic yttrium-rhodizonatecomplexes of higher charge number are formed. In contrast, it was not possible to establish the production of strontium-rhodizonate complexes in solution. Color changes and the formation of precipitates in trials in which (inactive) yttrium- and rhodizonate solutions were mixed in various proportions likewise showed that yttrium-rhodizonate complexes form. Similar trials were made with Al, Sc, Cr, La, Nd and Yb. The observed color changes of the solutions show that the ions of all of these elements form rhodizonate complexes.
    Abstract: Résumé On a étudié le comportement des radio-éléments90Sr et90Y, exempts de supports, sous l'effet de l'élution par des solutions rhodizoniques sur colonnes échangeuses cationiques et anioniques, en mesurant l'activité sur des fractions de l'éluat, et, une fois l'élution terminée, sur des tronçons de la colonne échangeuse. Les résultats montrent qu'il se forme des complexes anioniques de rhodizonate d'yttrium, de charge élevée. Par contre, on n'a pu mettre en évidence aucune formation de complexes de rhodizonate de strontium, en solution. Les changements de couleur et la formation de précipité, dans le cas des expériences où l'on mélangeait les solutions de rhodizonate et d'yttrium (inactives) suivant différents rapports, montrent de même qu'il se forme des complexes entre le rhodizonate et l'yttrium. On a effectué des expériences semblables avec Al, Sc, Cr, La, Nd et Yb. Les changements de couleur observés chez les solutions montrent que les ions de tous ces éléments forment des complexes avec le rhodizonate.
    Notes: Zusammenfassung Das Verhalten der trägerfreien Radioelemente90Sr und90Y bei der Elution von Kationen- und Anionenaustauschersäulen mit rhodizonathaltigen Lösungen wurde untersucht, indem Aktivitätsmessungen an Fraktionen des Eluats und, nach Beendigung der Elution, an Teilstücken der Austauschersäule durchgeführt wurden. Die Ergebnisse weisen darauf hin, daß anionische Yttrium-Rhodizonat-Komplexe höherer Ladungszahl gebildet werden. Hingegen konnte keine Bildung von Strontium-Rhodizonat-Komplexen in Lösung festgestellt werden. Farbänderungen und Niederschlagsbildung bei Versuchen, in denen (inaktive) Yttrium- und Rhodizonatlösungen in verschiedenen Verhältnissen gemischt wurden, zeigen ebenfalls, daß sich Yttrium-Rhodizonat-Komplexe bilden. Ähnliche Versuche wurden mit Al, Sc, Cr, La, Nd und Yb durchgeführt. Die beobachteten Farbänderungen der Lösungen zeigen, daß die Ionen aller dieser Elemente Rhodizonatkomplexe bilden.
    Type of Medium: Electronic Resource
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