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  • Chromatographie, Dünnschicht/Elektrophorese  (1)
  • Nannacara anomala (Cichlidae)  (1)
  • Organisation eines Labors  (1)
  • 1975-1979  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 175 (1976), S. 85-100 
    ISSN: 1432-0878
    Keywords: Teleost retina ; Mosaic-type ; Cones ; Cone horizontal cells ; Nannacara anomala (Cichlidae)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A total of 20 Golgi-impregnated cone horizontal cells of Nannacara anomala (Cichlidae) were studied in alternating semi- and ultrathin sections in order to examine their connections with the overlying square mosaic of equal double and central single cones. Cone horizontal cells exhibit three types of processes: (a) the long horizontal “axon”, (b) short horizontal dendrites with a terminal swelling, and (c) cone contacting processes ascending towards the outer plexiform layer. As seen in tangential sections, the latter processes are arranged in the form of two concentric circles including a central “spot”. The processes of the inner circle contact the eight double cone pedicles of one square unit: processes of the outer circle contact eight more double cone pedicles which are directly adjacent to the square unit. The central “spot” represents a process which contacts the central single cone. Processes of the inner circle most often terminate in a dichotomous branching which represents the lateral elements to one ribbon synapse, whereas in the outer circle only a single terminal swelling is observed. Because of the mosaic of the cones and the constancy of this pattern of connectivity a model can be constructed where the dendritic fields of the cone horizontal cells overlap to a considerable extent. From this model, it follows that each double cone pedicle is contacted by four different horizontal cells. The functional significance of these findings for color vision is discussed in the light of recent work with the microspectrophotometer characterizing the cone system of this species as bichromatic. The mosaiclike arrangement of the horizontal cell dendrites supports the conclusion that the parallels between the patterns of receptor and horizontal cells are no coincidence but play an important role in lateral inhibition and neural adaptation of the retina.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 115-119 
    ISSN: 1618-2650
    Keywords: Nachw. von Heterocyclen ; Chromatographie, Dünnschicht/Elektrophorese ; Fluorescenz, Fluorescenz-Thermochromie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung N-Heterocyclen lassen sich auf Chromatogrammen und Pherogrammen anhand der charakteristischen Fluorescenzfarben der CuJ-Komplexe identifizieren. Weitere Aussagen erhÄlt man oft durch den Farbwechsel bei tiefer Temperatur. Im Vergleich mit Dragendorffs Reagens sowie der Fluorescenzlöschung auf Kieselgel GF254-Schichten ist die Zuordnung der einzelnen Zonen wesentlich vereinfacht.
    Notes: Abstract N-heterocyclic compounds are identified on chromatograms and pherograms by the characteristic fluorescence of the CuI complexes. Often, further information is obtained by the colour change at low temperature. In comparison to Dragendorffs reagent and fluorescence quenching on silica gel GF254 layers the spots can be evaluated more easily.
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  • 3
    ISSN: 1618-2650
    Keywords: Elementaranalyse, Datenverarbeitung ; Organisation eines Labors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird das Konzept eines Echtzeit-Datenverarbeitungssystems beschrieben, das in Kombination mit mechanisierten und automatisierten Analysenmethoden eine Verbesserung der analytischen Serviceleistung ermöglicht. Die Hardware setzt sich im wesentlichen aus einem 28 K-Worte Kleincomputer mit 2 Plattenspeichereinheiten, Bedienungskonsolen und Beleglesern zusammen. Die hauptsächlichen Funktionen dieses Teils der Anlage sind: Registrieren der Aufträge, Erstellen von Arbeitslisten für die Laboratorien, Überwachen der termingerechten Auftragserledigung, Sammeln, Speichern und Auswerten der anfallenden Resultate, Treffen einfacher Entscheidungen und schließlich Erstellen und Ausdrucken der Analysenbefunde. Darüber hinaus verfertigt der Computer täglich Berichte über den Stand der Auftragserledigung und speichert Daten für die Statistiken und Kostenabrechnungen. Zur Datenübertragung aus den Laboratorien stehen 36 Linien zur Verfügung. Dabei ist wesentlich, daß elektronisch vorverarbeitete Daten, also fertig berechnete Resultate übertragen werden. Dazu dienen on-line angeschlossene Tischrechner, Datenstationen und Belegleser sowie Datenverarbeitungseinheiten (Prozent-Box) eigener Konstruktion. Die Arbeitsplätze in den Laboratorien sind somit weitgehend autonom. Dieses hierarchische Datenverarbeitungssystem bringt arbeitstechnische Vorteile, gewährleistet aber vor allem die ständige Servicebereitschaft unserer Laboratorien, da auch bei Ausfall des Computers an den Analysengeräten unbeeinflußt weitergearbeitet werden kann.
    Notes: Abstract To increase the efficiency of the analytical services the analytical methods have been improved by mechanisation and automation, and combined with a real-time data processing system. The hardware consists essentially of a 28 K-words minicomputer with 2 disc storage units, teletypes and optical mark readers. The main functions of this part of the system are as follows: registering the incoming requests, supplying work schedules for the various laboratories, controlling the completion of the work within the required time, collecting, storing, and processing the results, making simple decisions, and finally, editing and printing the analysis reports. Moreover, the computer produces daily reports on the state of progress of requests, and stores the data for usage in statistics and cost accounting. There are 36 lines available for the transfer of data from the laboratories. An important feature of the system design is the transfer of electronically preprocessed data, i.e. already calculated final results. For this purpose, on-line desk-top calculators, alphanumeric display data terminals, and data preprocessing units (percentage-box) designed and developed in our own laboratories are being used. The individual places of work in the laboratories are thus to a great extent autonomous. This hierarchical data processing system yields technical advantages, and most of all, guarantees a permanent service ability of our laboratories since even in the case of a breakdown of the computer, the analytical work can be continued without any interference.
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