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  • 1985-1989  (947)
  • 1880-1889  (207)
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  • 1
    Electronic Resource
    Electronic Resource
    Neue Vogelarten aus dem Massailand (Inneres Ostafrika) (1884)
    Springer
    Journal of ornithology 32 (1884), S. 52-58 
    Details
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02001804
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Adaptation of the rat kidney to altered water intake and urine concentration (1988)
    Springer
    Pflügers Archiv 412 (1988), S. 42-53 
    Details
    ISSN: 1432-2013
    Keywords: Antidiuretic hormone ; Thick ascending limb ; Renal medulla ; Morphometry ; Water intake ; Urinary concentrating mechanism ; Kidney adaptation ; Kidney hypertrophy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Previous experiments in Brattleboro rats with hereditary diabetes insipidus revealed that absence of ADH led to several alterations in kidney anatomy, which could be reversed by chronic ADH treatment. Present experiments were undertaken to determine if similar alterations were observable in normal Wistar rats when endogenous ADH level was varied by manipulating water intake or when exogenous ADH was infused. Water intake was increased by giving food with a high water content ad libitum and offering 5% glucose solution to drink (HWI rats), or decreased by reducing water intake to 1/3 of spontaneous intake (RWI rats). An additional group received chronic ADH infusion with Alzet osmotic minipumps (ADH rats). Results were compared to those obtained in control rats (CON) drinking ad libitum. RWI, CON, and ADH rats ate dry pellets ad libitum. After 6 weeks on these regimens kidneys were perfusion fixed and serial sections were cut for morphometric measurements by light microscopy. Results in the four groups showed that kidney weight relative to body weight was influenced by the operation of urinary concentrating mechanism, with HWI〈CON〈RWI〈ADH. The increase in kidney weight in rats with high urine concentration was not homogeneously distributed throughout the different kidney zones and the different nephron segments. The inner stripe of the outer medulla (IS) increased more in relative height and volume than other kidney zones and, within this zone, the volume of epithelium of thick ascending limb of Henle's loops (TAL) increased more than expected from the whole kidney weight increase. In outer stripe of outer medulla (OS) and in cortex (C), TAL hypertrophy was equal to or lower than expected from whole kidney weight increase. Collecting duct epithelium in C, OS, and IS increased in proportion to whole kidney weight. The MTAL hyperthrophy in IS was due to an increase in size of preexisting cells, except in the ADH group where an increase in cell number was also observed. Internephron heterogeneity with regard to glomerular size was greater in RWI and ADH than in CON and HWI rats. The marked hypertrophy of the deep TAL in the IS of rats in which urine concentration was stimulated could be related to an increase in salt transport in this nephron segment, triggered both by a direct stimulation by ADH, and by an increased salt recycling. The elongation of the inner stripe provides a greater length for the operation of the countercurrent multiplier system responsible for building up of the osmotic pressure gradient in the medulla. These observations show that the mammalian kidney is able to adapt to chronic alterations in water intake and urine concentration status.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00583730
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  • 3
    Electronic Resource
    Electronic Resource
    Über die Gesamtlänge und den Achsenwinkel des Unterkiefers — eine Analyse seitlicher Fernröntgenbilder (1985)
    Springer
    Journal of orofacial orthopedics 46 (1985), S. 241-246 
    Details
    ISSN: 1615-6714
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Comparative studies of lateral cephalometric radiographs of 81 patients exhibiting normal craniofacial structures withAngle class I and of 120 patients with skeletal mandibular prognathism (Angle class III) reveal a diagnostically significant difference in the «total length of the mandible C» (i. e. the distance between the mandibular condyle and the symphysis). The angle formed by the «mandibular axis C» and NSe however, does not differ significantly in these two groups of patients. The elongation of the total length of the mandible C in patients with mandibular prognathism is due mainly to an enlargement of the gonion angle and elongation of the mandibular body. Cephalometrically, the total length of the mandible therefore provides more reliable information on the mandibular situation than the single data of the mandibular body, ramus and angle.
    Abstract: Résumé Une étude comparative des téléradiographies de profil entre 81 témoins de la classe Id'Angle, ayant des relations maxillo-faciales normales, et 120 patients présentant une prognathie mandibulaire (classe III d'Angle), démontre que la «longueur absolue C» (distance entre le condyle et la symphyse) présente des valeurs différentes et significatives pour le diagnostic. Inversément à ce qu'on pouvait supposer, il n'existe pas de différence entre les deux groupes témoins, pour «l'angle C» (angle entre la longueur absolute C et NSe). Chez les patients de la classe III la trop grande longueur de la mandibule résulte d'un angle goniaque plus grand et d'une branche horizontale plus longue. La «longueur totale C» constitue en céphalométrie une mesure plus précise pour l'analyse de la mandibule, que l'addition des différentes longueurs de la mandibule (branches montante et horizontale) ainsi que de l'angle goniaque.
    Notes: Zusammenfassung Die vergleichende Untersuchung seitlicher Fernröntgenbilder von 81 Probanden mitAngle-Klasse I und regulärem Gesichtsschädelaufbau und 120 Patienten, die eine skelettale Progenie bei einerAngle-Klasse-III-Okklusion hatten, ergab, daß die “Gesamtlänge C” des Unterkiefers (Abstand zwischen dem Kondylus und dem knöchernen Kinn) diagnostisch verwertbare signifikante Unterschiede aufweist. Entgegen der Erwartung erlaubt die Größe des sogenannten “Achsenwinkels C” (Winkel zwischen Gesamtlänge C und NSe) keine Unterscheidung zwischen diesen beiden Patientengruppen. Die größere Gesamtlänge des Unterkiefers bei Progenie resultiert im wesentlichen aus einer Vergrößerung des Gonionwinkels und der Verlängerung des horizontalen Astes. Die “Gesamtlänge” repräsentiert die Verhältnisse des Unterkiefers kephalometrisch offensichtlich besser als die Berücksichtigung der einzelnen Daten für den Unterkieferkörper, den aufsteigenden Ast und den Gonionwinkel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173094
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  • 4
    Electronic Resource
    Electronic Resource
    α-CH-Acidität von Allyliden-Komplexen: Rheniumorganische Derivate des 1,2,3-Butatriens durch Dehydrochlorierung von Rhena(V)-allylidenen. Synthese und Strukturchemie (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2035-2040 
    Details
    ISSN: 0009-2940
    Keywords: CH Acidity ; Rhenium complexes ; Allylidene ; Butatriene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: α-CH Acidity of Allylidene Complexes: Organorhenium Derivatives of 1,2,3-Butatriene by Dehydrochlorination of Rhena(V) Allylidenes. Synthesis and StructureThe rhena(V) allylidene complex (η5-C5Me5)ReCl2 [η1:η3-(CH3)-CC(Cl)CH2] (2) is quantitatively converted into the novel organorhenium 1,2,3-butatriene derivative (η5-C5Me5)ReCl2[η3-H2CC(C5H5N)CCH2] (3) by lithium hydroxide in the presence of excess pyridine. This result shows so far not investigated CH acidity of methyl groups, that are substituting π-bonded allylidene frameworks at the α-position. According to an X-ray structure analysis, the coordination geometry of the 1,2,3-butatriene ligand is very similar to related allyl complexes of the (η5-C5Me5)ReCl2 fragment.
    Notes: Der Rhena(V)-allyliden-Komplex (η5-C5Me5)ReCl2 [η1:η3-(CH3)-CC(Cl)CH2] (2) wird durch Lithiumhydroxid in Gegenwart von überschüssigem Pyridin quantitativ zu dem neuartigen rhenium-organischen 1,2,3-Butatrien-Derivat (η5-C5Me5)ReCl2[η3-H2CC(C5H5N)CCH2] (3) dehydrohalogeniert. Dieses Ergebnis weist auf die bisher nicht beachtete CH-Acidität von Methylgruppen hin, die ein π-gebundenes Allyliden-Gerüst α-ständig substituieren. Einer Röntgenstrukturanalyse zufolge ist der von 1,2,3-Butatrien abgeleitete Ligand allylartig an das (η5-C5Me5)ReCl2-Fragment gebunden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221102
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  • 5
    Electronic Resource
    Electronic Resource
    Darstellung des Triphenylmethans (1881)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 14 (1881), S. 1942-1944 
    Details
    ISSN: 0365-9496
    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.18810140291
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Kentniss des Rosanilins (1880)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 13 (1880), S. 2204-2207 
    Details
    ISSN: 0365-9496
    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.188001302233
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Studies in sugar chemistry. 2. A simple method for O-deacylation of polyacylated sugars (1986)
    s.l. : American Chemical Society
    The @journal of organic chemistry 51 (1986), S. 727-730 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00355a026
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  • 8
    Electronic Resource
    Electronic Resource
    Irreducible analogs of mevaldic acid coenzyme A hemithioacetal as potential inhibitors of HMG-CoA reductase. 2. Synthesis of a secondary alcohol analog of mevaldic acid pantetheine hemithioacetal and an amide analog of 3-hydroxy-3-methylglutaryl-S-pantetheine (1986)
    s.l. : American Chemical Society
    The @journal of organic chemistry 51 (1986), S. 1955-1960 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00361a003
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of N-(.alpha.-methoxyalkyl) amides from imidates (1985)
    s.l. : American Chemical Society
    The @journal of organic chemistry 50 (1985), S. 5609-5611 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00350a035
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Photoelectron spectra of disubstituted 1,2,4,5-tetrazines (1988)
    s.l. : American Chemical Society
    The @journal of organic chemistry 53 (1988), S. 5756-5762 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00259a027
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