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  • 2005-2009
  • 1960-1964  (35)
  • 1940-1944
  • 1963  (9)
  • 1962  (11)
  • 1960  (15)
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Language
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  • 2005-2009
  • 1960-1964  (35)
  • 1940-1944
Year
  • 1
    Series available for loan
    Series available for loan
    Berlin [u.a.] : Borntraeger
    Associated volumes
    Call number: 9/SR 93.0082(40)
    In: Sammlung geologischer Führer
    Type of Medium: Series available for loan
    Pages: IX, 452 S. + 4 Beil.
    Series Statement: Sammlung geologischer Führer 40
    Language: German
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 51 (1963), S. 495-498 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Beryllium yields a characteristic bright blue stain with Chrome azurol S on filter paper. The interfering action of other cations can be eliminated by adding oxalate and EDTA. As little as 4.5μg of beryllium in 0.05 ml of test solution can be still detected. The sensitivity of the reaction is lowered by the presence of ten times as much of several cations.
    Abstract: Résumé Le béryllium donne sur papier filtre avec le chromazurol S, une tache caractéristique bleu clair. On peut écarter l'influence gênante des autres cations par addition d'oxalate et d'EDTA. On peut rechercher jusqu'à 4,5μg de béryllium dans 0,05 ml de solution. La sensibilité de la réaction se trouve diminuée par quelques cations pris en excès de dix fois.
    Notes: Zusammenfassung Beryllium gibt mit Chromazurol S auf Filtrierpapier einen charakteristischen hellblauen Fleck. Der störende Einfluß anderer Kationen kann durch Zugabe von Oxalat und ÄDTA behoben werden. Es lassen sich noch 4,5μg Beryllium in 0,05 ml Lösung nachweisen. Bei zehnfachem Überschuß einiger Kationen wird die Empfindlichkeit der Reaktion verringert.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Chromosoma 13 (1962), S. 521-525 
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The structure and behavior of XY bivalent in mice is discussed. The view that XY bivalent in pachytene is embedded within the sex vesicle was fully confirmed. X and Y are paired end-to-end by a nonchiasmatic connection, which is established already in pachytene and persists until first meiotic metaphase. The pachytene complement in mice consists of 19 rod-shaped autosomal bivalents and the XY bivalent embedded within the sex vesicle. A satisfactory identification of individual autosomes in male pachytene has not been found possible.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Chromosoma 11 (1960), S. 499-513 
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The first spermatocyte division has been investigated in Rhabdophaga batatas Walsh and Wachtliella persicariae L. It was shown that the course of this division cannot be described as mitosis, either “unipolar” or “modified bipolar”. Its essential features are: complete absence of pairing and the segregation of the chromosomes into two groups composed of 4 and 30-odd chromosomes. The segregation is accomplished by a peculiar expulsion of the group of 4 chromosomes from the main nucleus followed by an unequal cytokinesis. The spindle is absent and the nuclear membrane remains present during the entire course of the division. The second spermatocyte division occurs only in the smaller cell, which contains 4 chromosomes and bears all features of normal mitosis. For the description of the course of the first spermatocyte division and chromosome distribution, which occurs in this division, the terms “segregating division” and “monocentric configuration” were proposed. The available descriptions of the first spermatocyte division in other species of Cecidomyiidae have been analyzed. The pattern of this division in all so far investigated cecidomyiid species is very uniform and the terms “unipolar” or “modified bipolar” mitoses are here also inadequate. The cases were discussed in which the peculiar chromosome arrangements arise merely as a result of positive or negative interrelations between the centriole and the chromosome parts. With this as background, the monocentric configurations in Cecidomyiidae were explained in terms of an attraction between the centriole and centromeres, operating in one group, and a repulsion between the centriole and the chromosome ends acting in the second. The other so-called unipolar mitoses have been analyzed. It was shown that under this term at least three intrinsically different configurations have been described. For the cases of Sciara, Micromalthus debilis and Cecidomyiidae, the common denominator can be found: the chromosome movements in Sciara and M. debilis can also be explained as set forth above for Cecidomyiidae, i.e. in terms of two kinds of forces operating between the centriole and the chromosomes. The several spindle fibers present in Sciara and Micromalthus do not seem to be crucial for the chromosome movements.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 46 (1963), S. 9-12 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary The action of ultrasonic waves on the tryptophanase in Escherichia coli is described. The proteine of the tryptophanase is changed by ultrasonic waves, whereas the coenzyme pyridoxalphosphate is stable. In vitro pyridoxalphosphate is changed by ultrasonic waves.
    Notes: Zusammenfassung In der vorliegenden Arbeit wurde die Wirkung des Ultraschalls auf die Tryptophanase in Escherichia coli untersucht. Es konnte nachgewiesen werden, daß Ultraschall das Tryptophanase-Protein angreift, während das Coenzym Pyridoxalphosphat nicht verändert wird. Weiterhin wurde die Veränderung des Pyridoxalphosphats durch Ultraschall in vitro festgestellt.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 46 (1963), S. 1-8 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary The estimation of pyridoxalphosphate in Escherichia coli after irradiation is described. The investigations are made with resting and growing cells. A dose of 10, 40 or 80 kr does not change the pyridoxal-content of the cell. In all cultures of E. coli starts the synthesis of pyridoxalphosphate at the same time on the end of the log-phase.
    Notes: Zusammenfassung Um zu klären, ob der Tod von lebenden Zellen nach Röntgenbestrahlung auf eine Zerstörung des in der Zelle vorhandenen Pyridoxalphosphats und damit auf eine Blockierung der pyridoxalabhängigen Enzyme zurückzuführen ist, wurde in bestrahlten und unbestrahlten Escherichia coli der Pyridoxalphosphat-Gehalt bestimmt. Die Untersuchung wurde an ruhenden und wachsenden Zellen durchgeführt. Durch Bestrahlung mit 10,40 und 80 kr wird der Pyridoxalphosphat-Gehalt der Zelle nicht verändert. Alle Kulturen begannen zur gleichen Zeit am Ende der log-Phase des Wachstums mit der Neubildung von Pyridoxalphosphat.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 47 (1960), S. 446-447 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 49 (1962), S. 183-184 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 177 (1960), S. 166-175 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Wir stellten fünf verschiedene Harzmembranen her. Durch Aufkleben der dünnwandigen Folien auf das plangeschliffene Ende eines Glasrohres erhält man in einfacher Weise bequem zu handhabende Meßelektroden. Die anthranilsäurehaltigen Membranen eignen sich gut zur Indizierung des Endpunktes bei Säure-Base-Titrationen. Ganz besonders prägnante Titrationskurven ergeben sich nach der von Reilley, Cooke u. Furman angegebenen Methode der „Polarisations-Spannungs-Titration“; Alkalisalze bis 0,4 Mol/l stören dabei nicht.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 177 (1960), S. 185-190 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung Die kathodische Reduktion salzsaurer Wolfram(VI)-lösungen an Blei- oder Quecksilberelektroden verläuft über die 5 wertige Stufe bis zum 3 wertigen Wolfram. Wolfram(IV) tritt nicht auf. Reine Lösungen von dreiwertigem Wolfram hatten stets eine grüne Farbe; nur bei niedrigen Wolframkonzentrationen trat ein gelbgrüner Farbton hervor. Eine Reduktion über die 3 wertige Stufe hinaus konnte nicht festgestellt werden. Mit elektrolytisch hergestellten Wolfram(V)- und Wolfram(III)-lösungen führten wir Potentialmessungen an den Systemen WVI/V und WV/III in konzentriert salzsauren Lösungen durch. Es zeigte sich ein starker Einfluß der Säurekonzentration auf die Potentialwerte.
    Type of Medium: Electronic Resource
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