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  • 1985-1989  (947)
  • 1970-1974  (615)
  • 1880-1889  (207)
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  • 1
    Electronic Resource
    Electronic Resource
    Photoconversion of N-methyldiphenylamine to N-methylcarbazole. Calculated and observed quantum yields as a function of oxygen concentration (1974)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 96 (1974), S. 6267-6269 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00827a004
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Photoproduction of neutral pions on hydrogen at photon energies between 200 and 440 MeV (1971)
    Springer
    The European physical journal 245 (1971), S. 225-252 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract At the Bonn 500 MeV electron synchrotron the differential cross section of the reaction γ+p → π0+p has been measured detecting the recoil proton by a magnetic spectrometer. Angular distributions between pion c.m. angles of 50 ° and 160 ° were taken at photon energies between 220 and 420 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395234
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  • 4
    Electronic Resource
    Electronic Resource
    Photoproduction of neutral pions on hydrogen at photon energies between 200 and 440 MeV (1971)
    Springer
    The European physical journal 245 (1971), S. 272-282 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The two measurements of the process γ+p→π0+p at the Bonn 500 MeV electron synchrotron are discussed and after correction of systematic deviations combined to one set of data. A comparison with other measurements and theoretical calculations is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395236
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  • 5
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1972)
    Springer
    Annals of hematology 25 (1972), S. 214-219 
    Details
    ISSN: 1432-0584
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01632395
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Zur hormonalen Steuerung der Aktivität im Nebenhodengang (Ductus epididymidis) bei Ruineneidechsen (Lacerta sicula campestris Betta) (1971)
    Springer
    Journal of comparative physiology 73 (1971), S. 339-344 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung 1. Behandelt man männliche Ruineneidechsen während der Refraktärperiode mit ICSH, Testosteron, FSH und LTH, so zeigt sich im Ductus epididymidis nur unter dem Einfluß des FSH und des LTH eine positive Reaktion. 2. Mit dem Taubenkropftest ließ sich zu verschiedenen Zeiten (August 1970 bis Januar 1971) Prolactin in der Hypophyse männlicher Ruineneidechsen nachweisen.
    Notes: Summary 1. Under natural conditions spermiogenesis in male lizards (Lacerta sicula campestris Betta) shows an annual periodicity which can be divided into 4 phases: a) progression (end of refractory period—March); b) culmination (April– June/July); c) regression (July); d) regeneration = refractory period (August–November/December). 2. About February the activation of the germ epithelium starts, but the growth of the Ductus epididymidis (D.e.) and the production of secretion from its wall epithelium cannot be found before the middle of March. 3. The same phase-shifting can be observed at the end of culmination, while spermiohistogenesis stops in about June, the secretion of the D.e. goes on and only decreases during July. In cross-sections of the epididymidis the cessation of diameters in the D. e. runs to a minimum in winter. 4. Before starting our experiments, we proved the occurrence of LTH in the hypophysis of male lizards (August 1st. 1970) using the pigeon cropsac test of Turner and Grosvenor. We could verify this result in September and October 1970 and in January 1971. 5. While Testosteron and ICSH have no effect on the D.e. in refractory animals we got good activity — depending on concentration—after injecting FSH and LTH. This could mean that the D.e. is not a secondary sexual character but belongs to the accessory sexual organ systems. Assurance, however, can only be obtained if experiments with hypophysectomized animals give positive results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297680
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  • 8
    Electronic Resource
    Electronic Resource
    The molecular organization of nerve membranes (1972)
    Springer
    The journal of membrane biology 9 (1972), S. 209-228 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Plasma membranes were isolated from two types of squid nerves which have morphologically, different ratios of axolemma/Schwannlemma (A/S). These membranes were studied by means of differential and density gradient centrifugation. Thoroughly dissected giant axons were used as membrane source having low A/S ratio. Retinal fibers were used as membrane source with high A/S ratio. A similar procedure for the isolation of the plasma membranes was used for both types of squid axons. Differential centrifugation showed that at 1,500×g, the yield of membrane enzymes (Na, K-ATPase and NADH-ferricyanide oxidoreductase) from giant axon homogenates was 2 to 5 times greater than from retinal nerve homogenates, but at 105,000×g the opposite was the case, the yield from retinal axons being about two times greater. Thus, the major part of the membrane material from the retinal nerve seems to be less dense than the membrane material from giant axons. The behavior of the 105,000×g fraction from both types of fibers was studied by determining protein Na, K-ATPase, and NADH-oxidoreductase along a lineal sucrose gradient (10 to 40%; centrifuged at 40,600×g for 90 min). By any of the three measurements, retinal axons yielded a greater amount (2:1) of plasma membranes sedimenting at low sucrose concentration (16 to 25%) as compared to that observed at high sucrose concentration (35 to 38%). Giant axons, on the contrary, yielded a higher proportion of membranes (2.5:1) sedimenting at high sucrose concentrations (over 40%). The experimental data indicate that a different cellular origin can account for the behavior of nerve membranes along lineal gradient centrifugation. The membranes floating at low sucrose concentration („light membranes”) can be tentatively ascribed to the axolemma; the membranes found at high sucrose concentration („heavy membranes”) to the Schwannlemma and basement membranes. In accord with their high A/S morphological ratio, squid retinal axons yielded 5 times more light membranes (axolemma) than dissected giant axons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868053
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LIV. Synthese von übergangsmetall-carbonyl-ylid-Komplexen aus übergangsmetall-carbonyl-carben-Komplexen (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1262-1276 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LIV. Synthesis of Transition Metal Carbonyl Ylide Complexes from Transition Metal Carbonyl Carbene ComplexesSecondary und tertiary alkylphosphines PX3 [X3 = (CH3)3, (C2H5)3, (n-C4H9)3, (CH3)2H] react with (alkoxycarbene)- or (alkylthiocarbene)pentacarbonyl complexes of chromium(0) and tungsten(0),(CO)5Cr[C(OCH3)C6H5], (CO)5W[C(OCH3)CH3] and (CO)5W[C(SCH3)CH3], at low temperatures to give the corresponding ylidepentacarbonylmetal complexes (CO)5M[C(PX3)(YCH3)(Z)] (M = Cr, W; Y = O, S; Z = CH3, C6H5) under addition of the phosphines to the carbene carbon atom. The structures of the pale yellow, diamagnetic, and partially very thermolabile compounds were established by analysis, i.r., n.m.r., and mass spectra. The partial thermal conversion of (CO)5Cr[C(P(CH3)2H)(OCH3)(C6H5)] in acetone was shown to yield (CO)5Cr{P(CH3)2[CH(OCH3)(C6H5)]}.
    Notes: Durch Umsetzung sekundärer und tertiärer Alkylphosphine PX3 [X3 = (CH3)3, (C2H5)3, (n-C4H9)3, (CH3)2H] mit den (Alkoxycarben)- bzw. (Alkylthiocarben)pentacarbonyl-Komplexen von Chrom(0) und Wolfram(0), (CO)5Cr[C(OCH3)C6H5], (CO)5W[C(OCH3)CH3] und (CO)5W[C(SCH3)CH3], bei tiefen Temperaturen wurden unter Addition der Phosphine an das Carbenkohlenstoffatom entsprechende Ylid-pentacarbonylmetall-Komplexe (CO)5 M[C(PX3) (YCH3)(Z)] (M = Cr, W; Y = O, S; Z = CH3, C6H5) erhalten. Die Strukturen der schwach gelblichen, diamagnetischen, z T. sehr thermolabilen Verbindungen wurden durch Analyse, IR-, NMR- und Massenspektren gesichert. Die partielle thermische Reaktion von (CO)5Cr[C(P(CH3)2H)(OCH3)(C6H5)] in Aceton zu (CO)5Cr{P(CH3)2[CH(OCH3)(C6H5)]} wurde nachgewiesen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060423
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