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  • Chromatographie, Dünnschicht  (20)
  • Neurosecretion
  • Springer  (25)
  • American Geophysical Union
  • Irkutsk : Ross. Akad. Nauk, Sibirskoe Otd., Inst. Zemnoj Kory
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • Wiley
  • 2015-2019
  • 2005-2009
  • 1975-1979  (25)
  • 1970-1974
  • 1977  (25)
Collection
Publisher
  • Springer  (25)
  • American Geophysical Union
  • Irkutsk : Ross. Akad. Nauk, Sibirskoe Otd., Inst. Zemnoj Kory
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • Wiley
Years
  • 2015-2019
  • 2005-2009
  • 1975-1979  (25)
  • 1970-1974
Year
  • 1
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    Springer
    Cell & tissue research 182 (1977), S. 557-564 
    ISSN: 1432-0878
    Keywords: Sinus gland ; Gammarus ; Neurosecretion ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The sinus gland of Gammarus oceanicus, like that of other crustaceans, is composed of three elements: neurosecretory axons, glial cells and stromal sheath. Five neurosecretory axon types are identified on the basis of granule diameter, shape, and electron density, and axon matrix density. Exocytosis appears to be the major release mechanism of neurosecretory material. The preterminal regions of neurosecretory axons contain axoplasmic reticulum and neurotubules. Their arrangement in the axon and relationship with one another suggest a transport function. Multilamellar bodies are found in the terminal regions of neurosecretory axons. They arise from mitochondria and may be involved in granulolysis.
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  • 2
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Alcian blue ; Alcian yellow staining ; Ultrastructure ; Bulinus truncatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The neurosecretory system of the freshwater snail Bulinus truncatus was investigated. With the Alcian blue-Alcian yellow (AB/AY) staining method at least 10 different types of neurosecretory cells (NSC) were distinguished in the ganglia of the central nervous system. The differences in staining properties of the NSC — with AB/AY the cells take on different shades of green and yellow — are borne out at the ultrastructural level: the NSC types contain different types of neurosecretory elementary granules. The neurosecretory system of B. truncatus is compared to that of Lymnaea stagnalis, the species which has received the most attention among the pulmonates. It appears from the comparison that the systems of both species show many similarities, although some differences are also apparent.
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  • 3
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    Cell & tissue research 176 (1977), S. 109-120 
    ISSN: 1432-0878
    Keywords: Achatina fulica ; Aplysia californica ; Neurosecretion ; Homology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The right parietal ganglion of the African snail Achatina fulica contains an identifiable cluster of 20–40 white cells with somatic diameters of 80–110 μ. Cobalt chloride injection into these cells revealed an axon projection in the right parietal nerve as well as apparent terminations in the capsule. The cells contain an abundance of electron dense granules 1000–2000 Å in diameter which are formed in the Golgi apparatus. The granules stain with Gomori's chrome hematoxylin and paraldehyde fuchsin methods. While most cluster cells showed no “spontaneous” electrical activity, there was a correlation for the active cells between rate of activity and intensity of cell whiteness. These and other data suggest that the cluster cells are neurosecretory. A claim of homology with the “rostral white cells”, R3–R13, in the parieto-visceral ganglion of Aplysia is based on a similarity of morphological and electrophysiological features, together with analogous locations in the respective ganglia. It is concluded that the right parietal ganglion of Achatina is homologous with the right half of the parieto-visceral ganglion of Aplysia.
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  • 4
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    Cell & tissue research 180 (1977), S. 253-261 
    ISSN: 1432-0878
    Keywords: Microtubules ; Neurohypophysis ; Neurosecretion ; Axoplasmic transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The microtubules in the neurosecretory neurones of the posterior pituitary were studied using different electron microscopical techniques. Tannic acid staining indicated that the microtubules had a 13 protofilament substructure similar to that described for microtubules from other tissues and organisms; the dimensions of the microtubules were also similar to that previously reported. Albumen pretreatment clearly showed the microtubules running across axonal swellings, but not continuing across the nerve endings. The only organelles showing possible association with the microtubules were small vesicles and smooth endoplasmic reticulum, no association between hormone granules and microtubules could be seen.
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  • 5
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    Cell & tissue research 178 (1977), S. 129-141 
    ISSN: 1432-0878
    Keywords: Choroid plexus ; Vasopressin ; Neurosecretion ; Rat ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Light and electron microscopic examination of choroid plexuses from lateral ventricles of water-deprived and subcutaneously or intravenously vasopressin administered rats reveal morphologic changes typical for vasopressin responsive fluid transporting epithelia during hormonal stimulation. Ultrastructural changes noted in both dehydrated and vasopressin treated animals included: the frequent occurrence of choroidal “dark” cells, dilatation of the lateral and basal intercellular spaces, increased vacuolization of the apical cytoplasm, and a change in microvillar conformation from the normal clavate type to those with a filiform shape. On the basis of the ultrastructural changes observed it is proposed that the choroid plexus be regarded as a target tissue for vasopressin. These findings indicated that a vasopressinmediated transchoroidal cerebrospinal fluid absorption capability exists.
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  • 6
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    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 32-32 
    ISSN: 1618-2650
    Keywords: Nachw. von LSD, Ergot-Alkaloiden ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 7
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    Fresenius' Zeitschrift für analytische Chemie 284 (1977), S. 47-48 
    ISSN: 1618-2650
    Keywords: Analyse von Ergotalkaloiden ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 8
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    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 48-48 
    ISSN: 1618-2650
    Keywords: Nachw., Best. von Dichlorvos in Biolog. Material ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 9
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    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 255-255 
    ISSN: 1618-2650
    Keywords: Trenn. von Thiazolylbenzothiazolen ; Chromatographie, Dünnschicht ; isomere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 10
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    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 50-53 
    ISSN: 1618-2650
    Keywords: Trenn, von Seltenen Erden ; Chromatographie, Dünnschicht ; Verteilungsverfahren ; Tetrahydrofuran, Triphenylphosphinoxid, Paraldehyd, Di-iso-propyläther-Tetrahydrofuran
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Verteilungskonstanten von Selten-Erd-Nitraten im System Tributylphosphat-wäßrige Nitrat-Lösung werden berechnet. Dünnschicht-chromatographisch können mit Tributylphosphat in Isooctan als Laufmittel die Selten-Erd-Nitrate von La bis Gd vom Gd bis Lu getrennt werden. Eine Trennung von 13 Seltenen Erden auf einem Chromatogramm gelingt mit den Laufmitteln a) Tetrahydrofuran/Paraldehyd/Salpetersäure (20∶70∶10), b) dem Laufmittel Triphenylphosphinoxid (0,3 M in Paraldehyd) und konz. Salpetersäure im Verhältnis 90∶10, c) Di-iso-propyläther/Tetrahydrofuran/Salpetersäure (100 ∶ 60 ∶ 10). Der Trennmechanismus wird diskutiert.
    Notes: Abstract The distribution constants of the rare earth nitrates in the system tri-n-butylphosphate/aqueous nitrate solution are calculated. With thin-layer chromatography it is possible to separate the rare earth nitrates from La to Gd and from Gd to Lu in the solvent system tri-n-butylphosphate in i-octane. A separation of 13 rare earths in only one chromatogram is possible in the solvent systems a) tetrahydrofuran/paraldehyde/nitric acid (20∶70∶10), b) tri-phenylphosphinoxide (0.3 M in paraldehyde)/conc. nitric acid in the ratio 90∶10, c) di-iso-propylether/tetrahydrofuran/nitric acid (100∶60∶10). The mechanism of the separation is discussed.
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  • 11
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    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 111-120 
    ISSN: 1618-2650
    Keywords: Chromatographie, Dünnschicht ; Steuergerät zur automatischen Registrierung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein Gerät zur vollautomatischen Steuerung eines DC-Spektralphotometers wurde entwickelt. Zusätzlich zur automatischen Registrierung aller Spuren eines Dünnschicht-Chromatogramms werden Remissionsminima erkannt und ihre Remissionsgrade und Ortskoordinaten ausgedruckt. Eine zweite Betriebsart ermöglicht ein manuelles Abrastern und Ausmessen eines Fleckes an jeder beliebigen Stelle der DC-Platte. Ein Rechneranschluß zur Auswertung der Meßergebnisse ist vorhanden. An Hand von Beispielen wird gezeigt, daß Reproduzierbarkeits- und Konzentrationsfehler bei der automatischen Registrierung strichförmiger Flecke wesentlich kleiner sind als bei Handpositionierung kreisförmiger Flecke. Die Linearität verschiedener Analysenfunktionen wird über 2 Zehnerpotenzen der Strichbelegung untersucht. Dabei erweist sich die Kubelka-Munk-Funktion in bezug auf Linearität allen anderen untersuchten Funktionen überlegen. Eine Kosten-Nutzen-Rechnung zeigt, daß in einem Routinelabor durch Einsatz eines Auftragegerätes und eines Steuergerätes für die automatische Registrierung trotz höherer Investitionskosten die Gesamtkosten einer Analyse um 70% gesenkt werden können.
    Notes: Abstract An instrument has been constructed for the automatic control of a TLC spectrophotometer. In addition to the automatic scanning of all tracks of a thin-layer chromatogram the positions and values of diffuse reflectance minima are recognized and printed. A second mode allows the manual scanning and measurement of a spot at any position on the TLC plate. A digital output is provided for the evaluation of the results with a computer. The errors of reproducibility and of concentration are much smaller using the automatic scanning of bands than using the manual positioning of circular spots as the examples show. The linearity of several analytical functions is analysed within two decades of concentration. The Kubelka-Munk function was found to be superior in linearity to all other functions studied. Calculations of costs show, that the total costs of an analysis in a routine laboratory can be lowered to an extend of about 70% by the use of an application instrument and a controlling instrument for automatic scanning inspite of the higher costs of investments.
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  • 12
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    Fresenius' Zeitschrift für analytische Chemie 285 (1977), S. 270-270 
    ISSN: 1618-2650
    Keywords: Trenn. von Aryl-p-methoxybenzoylbenzofuranyl-thiosemicarbazonen, Contraceptiva ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 13
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    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 95-99 
    ISSN: 1618-2650
    Keywords: Nachw. von Herbiciden ; Chromatographie, Dünnschicht ; Dansylierung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Reaktion von Dansylchlorid mit verschiedenen Herbiciden und Derivaten, die Aminogruppen enthalten oder zu Anilinen hydrolysierbar sind, wird beschrieben. Auf der Dünnschichtplatte lassen sich die fluorescierenden Stoffe gut trennen und identifizieren, was anhand von schematischen Darstellungen der Dünnschicht-Chromatogramme gezeigt wird.
    Notes: Abstract The reaction of dansyl chloride with various herbicides and derivatives containing amino groups or hydrolyzable to anilines is described. On TLC plates the fluorescent substances can be readily separated and identified as shown by diagrammatic representation of the thin-layer chromatograms.
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  • 14
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    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 247-247 
    ISSN: 1618-2650
    Keywords: Trenn. von Diolen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 15
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    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 248-248 
    ISSN: 1618-2650
    Keywords: Trenn. von Ketoester-Kupplungsprodukten ; Chromatographie, Dünnschicht ; Aryldiazoniumchloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 16
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    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 249-249 
    ISSN: 1618-2650
    Keywords: Trenn. von Thiosemicarbaziden ; Chromatographie, Dünnschicht ; 4-phenyl-substituiert
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 17
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    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 250-250 
    ISSN: 1618-2650
    Keywords: Trenn. von 5,5-Dimethylcyclohexan-2-arylhydrazon-1,2,3-trionen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 18
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    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 255-255 
    ISSN: 1618-2650
    Keywords: Trenn. von Kationen ; Chromatographie, Dünnschicht ; ÄDTA-imprägn. Platten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 19
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    Fresenius' Zeitschrift für analytische Chemie 286 (1977), S. 254-254 
    ISSN: 1618-2650
    Keywords: Trenn. von Arylbenzimidazolyl-thiocarbamiden, Antithyroide Mittel ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 20
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    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 264-270 
    ISSN: 1618-2650
    Keywords: Best. von Benzpyren in Schwebstaub ; Chromatographie, Dünnschicht ; Routinemethode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird ein Verfahren zur dünnschicht-chromatographischen Bestimmung von Benz(a)pyren im Schwebstaub beschrieben, bei dem nach Extraktion mit Cyclohexan im Ultraschallbad die Trennung eindimensional auf Celluloseacetat-Folien nacheinander mit den Laufmitteln 95%ig. Äthanol/Dichlormethan (8∶2) und Pyridin/Methanol/Wasser (3∶5∶2) durchgeführt wird. Die Auswertung erfolgt fluorimetrisch direkt auf der Platte. Das Verfahren, das eine sichere Abtrennung des Benz(a)pyrens von Benz(k)fluoranthen und Anthanthren erlaubt, ist für die Bestimmung von 0,4–20 ng Benz(a)pyren/m3 Luft bei 24stündiger Probenahme mit einem „High Volume Air Sampler“ geeignet. Eine Erweiterung des Arbeitsbereiches nach oben und unten ist möglich. Der Gesamtzeitbedarf für die Analyse von drei Filterproben beträgt rund 5 h, von denen etwa 3 h auf die chromatographische Entwicklung entfallen.
    Notes: Summary A method is described for the thin-layer chromatographic determination of benzo(a)pyrene in suspended particulate matter, including the ultrasonic extraction with cyclohexane and the separation on cellulose acetate thin-layer foils by subsequent development in one direction with 95% ethanol-dichloromethane (8∶2) and pyridine-methanol-water (3∶5∶2). The quantitative evaluation is carried out by fluorimetric scanning of the plate. The method permits a reliable separation of benzo(a)pyrene from benzo(k)fluoranthene and anthanthrene and is suited for the determination of 0.4–20 ng of benzo(a)pyrene/m3 of air, if sampling is done with a High Volume Air Sampler during 24 h. The total time necessary to analyze three filters is about 5 h, wherein the chromatographic development takes 3 h.
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  • 21
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    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 312-313 
    ISSN: 1618-2650
    Keywords: Trenn. von Bixanthenen ; Chromatographie, Dünnschicht ; Mikrobestimmung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 22
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    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 319-319 
    ISSN: 1618-2650
    Keywords: Trenn. von Carbamyldimethylarylazopyrazolen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 23
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    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 28-31 
    ISSN: 1618-2650
    Keywords: Nachw. und Trenn, von Seltenen Erden in Erzen, Monazit, Techn. Produkten ; Chromatographie, Dünnschicht ; Di-isopropyläther/Tetrahydrofuran/HNO3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In Monaziten, technischen Produkten und Reinelementen (Verbindungen) wurden die Seltenen Erden dünnschicht-chromatographisch mit dem Laufmittel Di-isopropyläther-Tetrahydrofuran-Salpetersäure (65%) (100∶70∶6) getrennt und nachgewiesen. Mengenverhältnisse von 400∶1 sind zu trennen und eindeutig zu identifizieren. Bei größeren Unterschieden in den Rf-Werten kann das Verhältnis bis zu 1000∶1 betragen. Die absolut nachweisbare Menge auf einem Chromatogramm beträgt 0,05–0,1 μg. Die Größe der Flecken ermöglicht eine halbquantitative Abschätzung der Gehalte. Die Analysendauer beträgt mit Aufschluß 2 h, ohne Aufschluß 70 min.
    Notes: Summary In monazites, technical products and pure elements, rare earth elements were separated and identified by thin-layer chromatography using a 100∶70∶6 mixture of diisopropyl ether, tetrahydrofuran and HNO3 (65%) as an eluent. It is possible to separate and characterize them in concentrations of 400∶1 unambiguously. If the Rf-values differ remarkably a ratio of 1000∶1 is acceptable. The amount absolutely detectable on a chromatogram is 0.05–0.1 μg. The area of the spots allows a semiquantitative estimation. The time required for one analyses is without decomposition 70 min and including decomposition 2 h.
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  • 24
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    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 285-285 
    ISSN: 1618-2650
    Keywords: Trenn. von Aminothiazolyl-benzothiazolen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 25
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    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 288-288 
    ISSN: 1618-2650
    Keywords: Trenn. von Seltenen Erden aus Uran ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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