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  • Chromatographie, Dünnschicht  (18)
  • Bone
  • Neurosecretion
  • Springer  (22)
  • American Geophysical Union
  • Irkutsk : Ross. Akad. Nauk, Sibirskoe Otd., Inst. Zemnoj Kory
  • Krefeld : Geologischer Dienst Nordhein-Westfalen
  • Wiley
  • 2015-2019
  • 2005-2009
  • 1975-1979  (22)
  • 1970-1974
  • 1975  (22)
Collection
Publisher
  • Springer  (22)
  • 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  (22)
  • 1970-1974
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 161 (1975), S. 477-484 
    ISSN: 1432-0878
    Keywords: Neurosecretory cells ; Oncopeltus fasciatus ; Neurosecretion ; Neurophysin ; Aldehyde fuchsin ; Alcian blue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The dynamics of the “A” cells of the parsintercerebralis of Oncopeltus fasciatus over the first eight days of adult life was studied by microspectrophotometry of sections stained either with aldehyde fuchsin or alcian blue 8 GX. The data show that the two stains differ in their selectivity as they record different events in the history of the cells. A hypothesis is proposed that the aldehyde fuchsin is more sensitive to the presence of a “carrier” protein in the cell, whereas alcian blue 8 GX is more sensitive to the presence of the “active principle” in the cell.
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  • 2
    ISSN: 1432-0878
    Keywords: Neurohypophysis ; Neurosecretion ; Neurophysin ; Neurohypophysia hormones ; Electron microscopy ; Autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electron-microscope autoradiographs have been prepared from the neural lobes of the pituitary glands of rats which had received intracisternal injections of [35S] cysteine at various times before gland removal. The rate of appearance and disappearance of autoradiographically demonstrable radioactivity in the neural lobe closely paralleled that previously determined, biochemically, for radioactive hormones and neurophysins. Radioactivity was appreciably associated with the undilated parts of neurosecretory axons only during the first few hours after injection of the label. The axonal dilations were subdivided into those in which small vesicles could be seen (“endings”) and those in which no small vesicles could be seen (“swellings”). Radioactivity appeared first in “endings” and then in progressively larger and larger profiles of “swellings”. It appeared that newly arrived granules were found close to the limiting membrane of the nerve swelling and that as time progressed they moved deeper and deeper into the swelling. On the basis of the results, suggestions were made for an anatomical explanation of the readily-releasable pool of hormone which has been demonstrated pharmacologically.
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  • 3
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Osmotic stress ; Serum corticoid levels ; Catecholamine depletion ; Anas platyrhynchos (Aves)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effects of depleting brain catecholamines with a combined treatment of reserpine and α-methyl-p-tyrosine on serum corticosterone levels and release of immunoreactive neurophysin from the median eminence, in osmotically stressed and unstressed mallard ducks, were studied. Corticoid levels in salt loaded birds were more than three times that of unstressed birds. The combined treatment of reserpine and α-methyl-p-tyrosine significantly decreased the concentration of brain monoamines in all experimental groups and raised serum corticoid levels in non-stressed birds to the same level found in the osmotically stressed animals. Immunoreactive neurophysin in the zona externa of the median eminence was depleted in all birds subjected to either osmotic stress and/or reserpine treatment but not in unstressed control birds. These preliminary data indicate that catecholamines may exert an inhibitory influence on both ACTH release from the anterior pituitary and neurophysin from the median eminence and that these two events may in some way be interrelated in the duck.
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  • 4
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    Cell & tissue research 165 (1975), S. 129-133 
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Sinus gland ; Eyestalk ; Ultrastructure ; Uca
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the sinus gland of the fiddler crab, Uca pugnax, was investigated and found to be similar to that in other crustaceans. Five types of neurosecretory axon terminals were tentatively identified on the basis of the size, shape, and electron density of granules within the axons. Release of neuro-secretory material appears to be by exocytosis.
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  • 5
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    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 205-207 
    ISSN: 1618-2650
    Keywords: Trenn. von Methylolaminen, Melaminharzen ; Chromatographie, Dünnschicht ; Celluloseschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Identifizierung der Komponenten in einem Methylolmelamin-Gemisch mittels Dünnschicht-Chromatographie wurde möglich, nachdem die einzelnen Methylolmelamine (Mono-, Di-, Tri-, Tetra-, Penta- und Hexamethylolmelamin) rein dargestellt werden konnten. Aus der zweidimensionalen dünnschichtchromatographischen Entwicklung des Methylolmelamin-Gemisches folgt, daß während der Dauer der Entwicklung keine Änderung der Zusammensetzung des Methylolmelamin-Gemisches stattfindet. Die Chromatographie wurde auf Celluloseschichten mit Butanol/Äthanol/Wasser (4∶1∶2) als Fließmittel und ammoniakalkalischer Silbernitratlösung als Nachweisreagens durchgeführt.
    Notes: Abstract Identification of the components in a methylolmelamine mixture by thin-layer chromatography was facilitated after obtaining each of the individual methylolmelamines (mono-, di-, tri-, tetra-, penta- and hexamethylolmelamine). By the use of two-dimensional thin-layer chromatography it was noted that no change in the composition of the mixture takes place during the time of Chromatographic development. Separation was achieved on cellulose layers using butanol/ethanol/water (4∶1∶2) as solvent and ammonia-alkaline AgNO3 solution as detection reagent.
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  • 6
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    Fresenius' Zeitschrift für analytische Chemie 277 (1975), S. 105-110 
    ISSN: 1618-2650
    Keywords: Chromatographie, Dünnschicht ; Auswertung über die Kubelka-Munk-Funktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine quantitative Auswertung von Dünnschicht-Chromatogrammen über die Kubelka-Munk-Funktion wird beschrieben. Die mathematische Ableitung erfolgt über zwei Ansätze: Differentialgleichung und hyperbolisch-trigonometrische Funktionen. Es zeigt sich, daß beim Zweiwellenlängen-Densitometer die Bestimmung absoluter Remissionswerte entfällt, und das erhaltene Meßsignal mit geringem Aufwand linearisiert werden kann. Die Auswertung erfolgt über die Peakhöhe, ermittelt durch Zig-Zag-Scantechnik (Shimadzu CS 900). Meß- und Vergleichswellenlänge sollen dicht beieinander liegen, um ähnliche Streukoeffizienten zu erhalten. Vermessen wird Coffein im Bereich von 0,25–20 μg, in dem die Linearisierung noch einwandfrei arbeitet. Der Fehler liegt als relative Standardabweichung bei 1,9% (c=4–20μg,n=15) bzw. 2,7% (c=0,25–2 μg,n=22).
    Notes: Abstract The mathematical derivation is given by two different statements: differential equation and hyperbolic-trigonometric functions. It is shown that measurement of absolute values of remission is inapplicable. The signal is easily to be linearized. The evaluation is given by the maximum peak value obtained by the zig-zag scan technique (Shimadzu CS 900). To get similar scatter values sample and reference wave-length should be tuned as close as possible. Caffeine is measured from 0.25 to 20 μg. In this range the linearizer works unobjectionably and the error as relative standard deviation is in the order of 1.9% (4–20 μg,n=15) and 2.7% (0.25–2 μg,n=22), respectively.
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  • 7
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    Fresenius' Zeitschrift für analytische Chemie 277 (1975), S. 126-126 
    ISSN: 1618-2650
    Keywords: Trenn. von Anorgan. Ionen als Xanthate ; 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 277 (1975), S. 208-208 
    ISSN: 1618-2650
    Keywords: Nachw. von Diphenylpyralin im Urin ; Chromatographie, Dünnschicht ; UV-Bestimmung, N-Oxid und Desmethylderivat
    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 273 (1975), S. 7-9 
    ISSN: 1618-2650
    Keywords: Best. von Coffein, Phenacetin ; Chromatographie, Dünnschicht ; Spektralphotometrie ; Kopplung mit Tischrechner
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Am Beispiel der Bestimmung von Phenacetin und Coffein im pharmazeutisch verwendeten Mengenverhältnis wird die quantitative in situ-Auswertung eines Zweikomponentensystems im on line-Betrieb: Densitometer—Integrator—Tischrechner beschrieben. Die Eichgerade wird für beide Substanzen auf jeder Platte gesondert bestimmt. Durch eine Einschränkung des Konzentrationsbereichs auf obere und untere Toleranzgrenze ergeben sich Vereinfachungen der Ausgleichsrechnungen. Die erzielten Genauigkeiten liegen bei 2 Analysen pro Platte bei 1,51% (Phenacetin) und 2,56% (Coffein) bzw. bei 4 Analysen pro Platte bei 1,50% (Phenacetin) und 2,64% (Coffein) (rel. gen. Standardabweichung, n=18 bzw. n=36).
    Notes: Abstract A TLC method for the determination of phenacetin and caffeine in pharmaceutical preparations using a densitometer in line with an integrator and electronic desk calculator is described. The calibration curves of each compound were prepared where the higher and lower tolerance concentration levels were defined. The accuracy of the method is 1.51% (phenacetin) and 2.56% (caffeine) for two experiments carried out on each plate; 1.50% (phenacetin) and 2.64% (caffeine) for four experiments for each plate (relative standard deviation, n=18 and n=36, respectively).
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  • 10
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    Fresenius' Zeitschrift für analytische Chemie 273 (1975), S. 127-128 
    ISSN: 1618-2650
    Keywords: Best. von Triterpenen in Pflanzen ; Chromatographie, Dünnschicht ; densitometrisch, pentacyclische Verb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 11
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    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 30-30 
    ISSN: 1618-2650
    Keywords: Aufklärung von Morphinabbauprodukten ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 12
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    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 265-269 
    ISSN: 1618-2650
    Keywords: Chromatographie, Dünnschicht ; automatisches Auftragegerät, strich- und kreisförmige Flecke
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde ein Gerät zur automatischen Auftragung von kreisoder strichförmigen Flecken auf Dünnschicht-Platten entwickelt. 8 oder mehr gleiche Volumina verschiedener Konzentration werden in vorzuwählender Zeit auf die Schicht gebracht. Dadurch erhält man reproduzierbare Flecke, die nach dem Chromatographieren direkt auf der Schicht in Remission oder Transmission gemessen werden. Konzentrationen von Komponenten in Gemischen lassen sich mit einem relativen Fehler von 2–3,5% bestimmen. Der Zeitaufwand beträgt 5–10 min.
    Notes: Abstract An automatic device for the application of spots or bands on TLC plates has been constructed. 8 or more equal volumes of different concentrations are applied to the TLC plate in preselected time. Reproducible spots or bands are obtained, which are measured by remission or transmission directly on the plate after chromatography. Concentrations of components in mixtures can be evaluated with a relative error of 2–3.5%. The time required is 5–10 min.
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  • 13
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    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 257-264 
    ISSN: 1618-2650
    Keywords: Katalytische Dehydrierung ; Ultramikrobereich, Apparatur, TAS-Verfahren ; Thermofraktographie/TAS-Verfahren/Chromatographie, Dünnschicht ; Dehydrierung, Ultramikrobereich ; Analyse von Sesquiterpenderivaten, Terpenoiden, Steroiden ; Chromatographie, Dünnschicht ; katalyt ; Dehydrierung, TAS-Verfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die direkte Kopplung einer katalytischen Dehydrierung mit der Dünnschicht-Chromatographie wird beschrieben. Die Reaktion erfolgt nach dem Prinzip der Gasphasendehydrierung durch schubweises Einspritzen der Lösung der zu dehydrierenden Verbindung in die z. B. mit Palladium-Bariumsulfat-Katalysator versehene TAS-Patrone. Die Einwaagen liegen im Bereich von 20–100 μg und die Reaktionstemperaturen je nach Verbindung zwischen 200 und 400°C. Die Reaktionsprodukte werden durch die Lösungsmitteldämpfe zur Schicht transferiert. Anschließend wird chromatographiert und die Reaktionsprodukte identifiziert. Als Anwendungsbeispiele werden Sesquiterpenkohlenwasserstoffe und -alkohole, Sesquiterpenoide des Eudesmantyps, Abietinsäure und Steroide dehydriert.
    Notes: Abstract Direct coupling of a catalytic dehydrogenation to TLC is described. The reaction takes place according to the principle of gas phase dehydrogenation by injecting the solution of the compound to be dehydrogenized in batches into the TAS-cartridge, loaded with e.g. palladium-barium sulphate catalyst. Sample size are in the range of 20–100 μg and the reaction temperatures, depending on the compound, is between 200 and 400°C. The reaction products are carried by the solvent vapours to the thin-layer and subsequently chromatographed and identified. In given examples the dehydrogenation is applied to sesquiterpene hydrocarbons and alcohols, sesquiterpenoids of the eudesman type, abietic acid and steroids.
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  • 14
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    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 300-300 
    ISSN: 1618-2650
    Keywords: Best. von Nicotin, Cotinin, Nicotin-N-oxid in Harn ; 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 274 (1975), S. 381-381 
    ISSN: 1618-2650
    Keywords: Nachw. von Wasserstoffperoxid ; Chromatographie, Dünnschicht ; Fertigfolien
    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 275 (1975), S. 28-28 
    ISSN: 1618-2650
    Keywords: Nachw. von Organ. Verbindungen, stickstoffhaltig ; Chromatographie, Dünnschicht ; Chlorierungsreaktion
    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 275 (1975), S. 29-29 
    ISSN: 1618-2650
    Keywords: Trenn. von Phenolen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
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  • 18
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    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 30-30 
    ISSN: 1618-2650
    Keywords: Best. von Sterigmatocystin ; Chromatographie, Dünnschicht ; Grauskala
    Source: Springer Online Journal Archives 1860-2000
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  • 19
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    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 201-202 
    ISSN: 1618-2650
    Keywords: Trenn. von Pesticiden, Carbamaten, Phenylharnstoffen ; Chromatographie, Dünnschicht ; Schicht aus basischem Zinkcarbonat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Dünnschichten von basischem Zinkcarbonat eignen sich zur Trennung und multiplen Identifizierung von Herbiciden und Insecticiden aus den Wirkstoffgruppen der Carbamate und Phenylharnstoffderivate. Fünf Wirkstoffe, die für die Praxis große Bedeutung haben, konnten mit Hilfe der eindimensionalen Dünnschicht-Chromatographie getrennt werden. Die beste Trennung erhielten wir mit folgenden Laufmitteln: a) Benzol, b) einer Mischung aus Benzol/Petroläther/Chloroform (6∶1∶1). Die Substanzen sind entweder im kurzwelligen UV-Licht bei Indicatorzusatz, oder nach dem Sprühen mit einer 0,1 N AgNO3-Lösung in 3 N HNO3 und anschließender UV(254)-Bestrahlung zu erkennen.
    Notes: Abstract Thin layers of basic zinc carbonate can be used with good results for separation and multiple identification of carbamate and phenylurea pesticides. Five important substances could be separated by one-dimension TLC. The best results were obtained by the following developing solvents: a) benzene, b) a mixture of benzene/petroleum ether/chloroform (6∶1∶1). The substances are either recognisable in short-wave UV-light, when a fluorescence indicator (F 254 nm) is added, or in day-light, after spraying a solution of 0.1 N AgNO3 in 3 N HNO3, followed by an UV-exposure for about 4 min.
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  • 20
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    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 206-206 
    ISSN: 1618-2650
    Keywords: Best. von Blei, Cadmium, Quecksilber, Zink ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
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  • 21
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    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 301-302 
    ISSN: 1618-2650
    Keywords: Trenn. von Pesticiden, Carbamaten, Phenylharnstoffen ; Chromatographie, Dünnschicht ; Schichten aus verschiedenen Polyamid-Chargen
    Source: Springer Online Journal Archives 1860-2000
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  • 22
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    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 382-382 
    ISSN: 1618-2650
    Keywords: Trenn. von Aminen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
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