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  • 1980-1984  (9)
  • 1970-1974
  • 1950-1954
  • 1890-1899  (1)
  • Chemistry  (9)
  • Acne vulgaris  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 268 (1980), S. 207-215 
    ISSN: 1432-069X
    Keywords: Estrogen receptor ; Androgen receptor ; Acne vulgaris ; Östrogenreceptoren ; Androgenreceptoren ; Acne vulgaris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei insgesamt 24 Patienten mit Acne vulgaris wurden Östrogen-und Androgenreceptoren im Biopsiematerial untersucht. Unter den 24 Patienten waren 15 Männer im Alter von 14–40 Jahren und 9 Frauen mit einem Alter von 14–41 Jahren. Als Vergleichskollektiv wurden endokrin gesunde Patienten ausgewählt und normale Hautareale bei 16 Männern und 27 Frauen biopsiert. Das Biopsiematerial bei den Acne-Patienten trug Komedonen, pustulöse oder papulöse Efflorescenzen. Während der Hauptbiopsien wurden in der gleichen Sitzung auch Blutproben zur radioimmunologischen Untersuchung der Testosteron-Serumspiegel entnommen. Die Bestimmung der Östrogen-und Androgenreceptoren wurde mit Hilfe einer Sättigungsanalyse durchgeführt. Als Trennmethode wurde eine Tierkohlenmethode verwendet und die spezifische Bindung durch Parallelinkubationen mit nichtradioaktiv markierten Liganden berechnet. Bei den weiblichen und männlichen endokrin gesunden Kontrollpersonen konnten keine Östrogenreceptoren in der normalen Haut nachgewiesen werden. Bei 93% der männlichen bzw. 78% der weiblichen Acne-Patienten wurden Östrogenreceptoren zwischen 11 und 275 fMol/mg Protein gefunden. Die Untersuchung der Androgenreceptorspiegel bei normaler Haut ergab, daß 31% der männlichen bzw. 48% der weiblichen Vergleichspersonen Androgenreceptorspiegel zwischen 35 und 213 fMol/mg Protein aufwiesen. 40% der männlichen bzw. 100% der weiblichen Acne-Patienten hatten einen positiven Androgenreceptorbefund. Bei den Acne-Patientinnen wurde eine Korrelation von r=0.71 zwischen dem Östrogen und Androgenreceptorspiegel registriert. Keine Korrelation hingegen konnte bei den männlichen Acne-Patienten gefunden werden. Die Auswertung der Testosteron-Serumspiegel und der Androgenreceptorspiegel ergab bei den Acne-Patientinnen eine Korrelation von r=0,77, während die Korrelation bei den männlichen Patienten bei r=0,66 lag. Das Ergebnis der vorliegenden Untersuchung erlaubt den Schluß, daß die größere Receptorempfindlichkeit bei sonst normalem Testosteron-Serumspiegel einer der Faktoren für die Entstehung der Acne sein kann. Die Miteinbeziehung der Receptoruntersuchung gestattet eine bessere Therapieplanung bei den Acne-Patienten. Überdies kann von den vorliegenden Ergebnissen abgeleitet werden, daß männliche Acne-Patienten einer hormonellen Therapie durch Östrogene bzw. Antiöstrogene zugängig sein sollten.
    Notes: Summary Fifteen male and 9 female patients between 14 and 41 years of age who suffered from acne were included in this study. Sixteen endocrine normal males and 27 females were used as controls. Skin and venous blood samples were taken from both normal and acne patients. Specific estrogen and androgen receptor levels were assayed under conditions resulting in the estimation of unoccupied receptor levels, and the charcoal technique was utilized. Testosterone serum levels were determined by radioimmunoassay. No estrogen receptors could be found in the normal skin. Of the male and female acne patients 93 and 78%, respectively, were estrogen receptor-positive, and their levels were between 11 and 275 fmol/mg cytosol protein. On the other hand, 31 and 48%, respectively, of the male and female acne patients were androgen receptor-positive, and their receptor levels were between 35 and 213 fmol/mg cytosol protein. A correlation of r=0.71 between estrogen and androgen receptor levels was noted in the female subjects, but no correlation was found in the male subjects. A correlation between testosterone serum levels and androgen receptor levels of r=0.77 and r=0.66, respectively, was noted in the female and male acne patients. The results of the present investigation suggest that androgen receptor levels play an important role in acne patients with normal testosterone serum levels. In addition, the presence of estrogen receptor levels in acne patients indicates a possible therapy by anti-estrogens or estrogens.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 1277-1291 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Viscosity measurements were carried out as a function of pressure and temperature with solutions of polystyrene in eight (endothermal) θ-solvents at the respective critical composition by means of a Searle-type apparatus. A rolling-ball viscometer was used for the investigation of the pure solvents. In all cases the viscosity coefficient increases in a more or less exponential manner when the pressure is raised. For θ-conditions, the volumes of activation of the solutions exceed that of the pure solvent by typically 10-15%. The exact amount of this extra efffect stemming from the presence of the polymer and its variation with temperature can be qualitatively correlated with the heats of mixing. The ratio of the viscosity of the solution at 1000 and 1 bar, respectively, can be varied for a given solvent power (θ-temperature) by the choice of the solvent from ca. 2 (cyclopentane) to 4 (trans-decalin). Within a given system, the maximum effects that can be realized by a change of the solvent power via the variation of temperature ranges from ca. 3 to 6 (tert-butylacetate).
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 695-700 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass Spectroscopy of Natural Products. VII. Mass Spectroscopic Studies of C-3-substituted Nitrogen Containing Friedelanes
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectral fragmentation behaviour of some nitrogen-containing and ring C cleaved usnic acid derivatives has been studied. The principal fragmentation pathway is drastically changed in the nitrogen-containing compounds when compared to that observed with the ring C cleaved derivatives. The main fragment ions of the ring C derivatives are also present in the mass spectrum of usnic acid itself.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 8 (1981), S. 13-18 
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fragmentation behaviour of N-6 substituted ergoline derivatives (acylaminothiocarbonyl, thiazolyl) has been studied using electron impact, field desorption and collisional activation mass spectrometry. The specific fragmentations are compared with structurally related compounds (piperidine and piperidine-3-carboxylic acid methyl ester derivatives).
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fragmentation behaviour of 16 selected usnic acid derivatives has been studied. A comparison of their positive (10-16 e V) and negative (2-4 e V) ion mass spectra showed differences not only in the fragmentation patterns but also in the mechanisms of some elimination reactions as established by deuterated analogues.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 293 (1896), S. 101-106 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 654-660 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass Spectroscopy of Natural Products. XIII. Mass Spectroscopic Investigations of A-nor-AllobetulanesThe mass spectroscopic fragmentation behaviour of A-nor-allobetulanes with several substituents at C-2 is discussed. The skeleton fragmentation is comparable to that of C-3-substituted allobetulanes. The nature of the substituent at C-2 influences both the abundance of typical skeleton fragments and the formation of specific ions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1982), S. 174-175 
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fragmentation behaviour of D-6(6-alkyl-4H-1,3-thiazin-4-on-2-yl)-8-methoxycarbonylergolines-I is described. Using collision induced dissociation (CID) mass spectrometry it could be established that the structure of the heterocyclic substituent at N-6 of the ergoline is retained during the fragmentation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fragmentation behaviour of clavine alkaloids is discussed in relation to the influence of the ring D structure. The appearance of significant ions is correlated with structural features of clavines. Using linked scan techniques and deuterium labelling some mechanistic approaches were made.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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