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  • 1
    Electronic Resource
    Electronic Resource
    Cytophysiology of neurosecretory axon terminals in the brain of an annelid (Ophryotrocha puerilis, Polychaeta) (1991)
    Springer
    Cell & tissue research 264 (1991), S. 339-345 
    Details
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Catecholamines ; HPLC ; Immunohistochemistry ; Glyoxylic acid fluorescence ; Ophryotrocha puerilis (Annelida)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the posterior part of the brain of the protandric polychaete Ophryotrocha puerilis neurosecretory cells form prominent axon terminals. The terminals are arranged in two complexes. The perikarya of these presumably monopolar neurons are scattered in the anterior part of the cerebral perikaryal layer. In females the terminals store large amounts of neurosecretory material. It has been suggested earlier that neurosecretions of the terminals may play a role during sex reversal from females to males. Application of histamine caused the release of neurosecretory material from the respective terminals in females. However, this discharge was not followed by sex reversal. Application of reserpine had no influence on the terminals. Neither by in vivo observation nor by ultrastructural analysis any effect of reserpine on the terminal complexes could be observed. In isolated terminals filled with neurosecretory material from females, catecholamines could not be detected by HPLC. Also, polyclonal antibodies against dopamine did not stain the terminal complexes. Furthermore, the complexes did not develop any fluorescence after glyoxylic acid treatment. Therefore, the present results contradict the hypothesis that the neurosecretory material of the respective axon terminals is catecholaminergic and that it is involved in sex differentiation. The function of the secretory neurons studied here remains unclear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313972
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  • 2
    Electronic Resource
    Electronic Resource
    The catecholaminergic system of an annelid (Ophryotrocha puerilis, Polychaeta) (1991)
    Springer
    Cell & tissue research 265 (1991), S. 175-184 
    Details
    ISSN: 1432-0878
    Keywords: Nervous system ; Nervous system, peripheral ; Catecholamines ; Immunohistochemistry ; Glyoxylic acid fluorescence ; Ophryotrocha puerilis (Annelida)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The complex catecholaminergic (CA) nervous system of the polychaete Ophryotrocha puerilis is documented using glyoxylic acid induced fluorescence (GIF) and immunohistochemistry. CA-neurons are found both in the central and peripheral nervous system. In the brain, about 50 CA-neurons are present in the perikaryal layer together with numerous CA fibres. Two pairs of CA perikarya are characteristic for each ganglion of the ventral nerve cord. CA-neurites in the ventral nerve cord are mainly arranged in 4 strands paralleling the longitudinal axis of the worm. Fluorescent neurons with receptive ciliary structures are present in body appendages (antennae, palps, urites, parapodial cirri), in the body-wall, and within the oesophageal wall. Furthermore, a subepidermal nerve net of free CA nerve endings has been found. After incubation of specimens with dopamine prior to the development of GIF more fluorescent perikarya could be observed; the fluorescence was also intensified. Pre-incubation with reserpine reduced the intensity of GIF. Results of high pressure liquid chromatography and immunostaining with a polyclonal antibody against a dopamine-glutaraldehyde-complex suggest that dopamine is the major CA transmitter. It is thought that dopaminergic neurons together with ciliary receptive structures act as mechano- and/or chemoreceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318152
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  • 3
    Electronic Resource
    Electronic Resource
    Titantetrafluorid - Eine überraschend einfache Kolumnarstruktur (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1227-1231 
    Details
    ISSN: 0044-2313
    Keywords: TiF4 ; preparation, single crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Titanium Tetrafluoride - a Surprising Simple Column StructureFor the first time single crystals of TiF4 have been obtained by solvothermal decomposition of (O2)2Ti7F30 in anhydrous HF. The colourless, transparent needles crystallize orthorhombic in spacegroup Pnma-D2h16 (No. 62) with a = 2 281.1, b = 384.8, c = 956.8 pm, Z = 12. The new type of structure is dominated by isolated columns of corner-linked TiF6-octahedra.
    Notes: Durch Solvothermalsynthese in wasserfreier HF gelang es endlich erstmals, TiF4 aus (O2)2Ti7F30 in Form solcher Einkristalle darzustellen, die eine Strukturbestimmung ermöglichten. Die farblosen, transparenten Nadeln kristallisieren in der Raumgruppe Pnma-D2h16 (Nr. 62) mit a = 2 281,1, b = 384,8, c = 956,8 pm, Z = 12. TiF4 bildet einen eigenen Strukturtyp, dessen charakteristisches Merkmal von einander isolierte, aus TiF6-Oktaedern aufgebaute Säulen sind (Kolumnarstruktur).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210720
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  • 4
    Electronic Resource
    Electronic Resource
    Über die Hydrolyse von Eisen(III)-Salz-Lösungen. II Die Alterung der Hydrolyseprodukte (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 417 (1975), S. 114-124 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Hydrolysis of Iron (III) Salt Solutions. II. Ageing of Hydrolysis ProductsThe long time ageing up to 15 years of the products obtained by alkalifying iron(III) chloride solutions to different neutralisation degrees has been studied. The concentration of the Fe3+ and the Cl- ions, the strength of the alkali, and the rate of its addition influence the results. Slow alkalifying produced up to 90% neutralisation β-FeOOH. The transformation of the amorphous iron(III) oxidehydroxide to β-FeOOH was promoted by a high concentration of the Cl- ions. When a large amount of amorphous iron(III) oxidehydroxide was formed, intimately intergrown crystals of α- and β-FeOOH resulted. On further ageing β-FeOOH transformed into α-FeOOH. At a degree of neutralisation of 95 and 100% transformation of the amorphous iron(III) oxidehydroxide into α-Fe2O3 occurred. The 100% neutralized precipitate, however, remained partly amorphous. Authors discuss the factors that determine very slow reactions leading to these results.
    Notes: Es wird über die Alterung (bis zu 15 Jahren) von Produkten berichtet, die durch Alkalisierung von Eisen(III)-chlorid-Lösung bis zu verschiedenen Neutralisationsgraden erhalten wurden. Die Konzentration an Fe3+- und Cl-_Ionen, die Alkalistärke und die Geschwindigkeit der Zugabe beeinflußten die Ergebnisse. Langsames Alkalisieren ergibt bis zu 90%iger Neutralisation β-FeOOH. Die Umwandlung des amorphen Eisen(III)-oxidhydroxids in β-FeOOH wird durch eine hohe Konzentration an Cl-_Ionen gefördert. Nach der Bildung einer größeren Menge von amorphem Eisen(III)-oxidhydroxid entstehen innig verwachsene Kristalle von α- und β-FeOOH. Bei weiterer Alterung geht β- in α-FeOOH über. Bei einer Neutralisation von 95 bis 100% erfolgt eine Umwandlung des amorphen Eisen(III)-oxidhydroxids in α-Fe2O3. Zu 100% neutralisierte Niederschläge verbleiben jedoch teilweise amorph. Die Autoren diskutieren die Faktoren, die die sehr langsame Reaktion bestimmen und zu diesen Ergebnissen führen.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754170207
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  • 5
    Electronic Resource
    Electronic Resource
    Einige Umsetzungen am Cholestantriol (1937)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 70 (1937), S. 1947-1952 
    Details
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19370700918
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