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  • Springer  (35)
  • 1990-1994  (13)
  • 1970-1974  (8)
  • 1935-1939  (14)
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  • 1
    Electronic Resource
    Electronic Resource
    Isotope shifts in the atomic spectrum of xenon and nuclear deformation effects (1974)
    Springer
    The European physical journal 270 (1974), S. 113-120 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optical isotope shifts of four lines in the atomic spectrum of xenon have been measured using enriched samples of all stable xenon isotopes. The spectrograms were recorded with the aid of a pressure-scanned Fabry-Pérot interferometer and analysed by digital data techniques. The measured isotope shifts are shown to be self-consistent by means of a King plot. An estimate of the specific mass effect is given and the changesδ 〈r 2〉 of the mean square radius of the nuclear charge distribution are extracted from the measured shifts. These changesδ 〈r 2〉 are discussed in terms of the nuclear deformation parameterβ 2. The results for the deformation of the stable even xenon isotopes are shown to be in good agreement with the systematic of deformation found for the neighbouring elements from Coulomb excitation experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01677442
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  • 2
    Electronic Resource
    Electronic Resource
    Hochfrequenzleitfähigkeit biologischer Gewebe im Wellenlängenbereich von 3 bis 1400 Meter (1937)
    Springer
    Naturwissenschaften 25 (1937), S. 24-25 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01493009
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  • 3
    Electronic Resource
    Electronic Resource
    Die Eigenschwingungen der in ihrer Ebene allseitig gleichmäßig belasteten gleichseitigen Dreiecksplatte (1936)
    Springer
    Archive of applied mechanics 7 (1936), S. 83-87 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02084138
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  • 4
    Electronic Resource
    Electronic Resource
    Qualitative Analysen und kolorimetrische Schätzungen mit Hilfe der Jenaer Glastüpfelplatte (1937)
    Springer
    Microchimica acta 1 (1937), S. 144-153 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary 1. On account of its transparency, a spot test plate made of Jena glass („Jenaer Glastüpfelplatte“) is suitable for all spot tests, no matter what colour the reaction products have. 2. It has been found that the greatest sensitivity is reached by working on a spot test plate which rests on a white or black background. A silver coloured paper gives a rather convenient background, both for bright and dark precipitates and hues. 3. By making spot tests with suitable standard solutions, on this plate, one can perform semi-quantitative analyses. 4. It is possible, on this plate, to determine the concentration of hydrogen ions with satisfying accuracy. 5. The new spot tests plate may be advantageously used for fluorescence tests and several microscopical examinations.
    Abstract: Résumé 1° La plaque de touche en verre d'Iéna (Jenaer Glastüpfelplatte) possède, grâce à sa transparence, toutes les qualités requises pour les réactions de touches, quelle que soit la couleur des produits de réaction. 2° On a constaté que la sensibilité maximale est atteinte en travaillant sur un fond blanc ou noir. Un papier couleur d'argent peut servir de fond, également convenable, pour les précipités (et colorations) clairs et foncés. 3° Au moyen de solutions types appropriées on peut exécuter, sur cette plaque, des analyses de touche sémi-quantitatives. 4° Sur la plaque en verre décrite, il est possible de déterminer la concentration des ions d'hydrogène, avec une précision satisfaisante. 5° Aussi, l'emploi de cette plaque offre des avantages pour les analyses par fluorescence et pour certaines recherches microscopiques.
    Notes: Zusammenfassung 1. Wegen ihrer Durchsichtigkeit eignet sich die Jenaer Glastüpfelplatte für sämtliche Tupfreaktionen, gleichgültig welche Farbe die Reaktionsprodukte besitzen. 2. Die größte Empfindlichkeit wurde beim Arbeiten mit weißer bzw. schwarzer Unterlage festgestellt. Als Untergrund sowohl für helle als auch für dunkle Niederschläge und Färbungen ist ein silberfarbiges Papier recht geeignet. 3. Durch Tüpfeln auf der Jenaer Glastüpfelplatte sind bei Verwendung entsprechender Vergleichslösungen halbquantitative Analysen ausführbar. 4. Die Bestimmung der Wasserstoffionenkonzentration ist auf der Glastüpfelplatte mit guter Genauigkeit möglich. 5. Für Fluoreszenzprüfungen und manche mikroskopische Untersuchungen wird die Glastüpfelplatte ebenfalls mit Vorteil verwendet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01475974
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  • 5
    Electronic Resource
    Electronic Resource
    Synthese und Reaktionen von 2-Arylhydrazono-2-cyan-N,N-dialkyl-acetamidinen (1991)
    Springer
    Monatshefte für Chemie 122 (1991), S. 195-207 
    Details
    ISSN: 1434-4475
    Keywords: 5-Dialkylamino-2-aryl-1,2,3-triazoles ; 4-Amino-2,6-dioxo-tetrahydropyrid-3-yl-pyridiniumchloride ; 2-Arylhydrazono-2-cyan-N-chloracetylacetamide ; Arylhydrazono-2-cyan-N,N-dialkylacetamidines ; Arylhydrazonomalononitriles ; 4-Imino-5-arylazo-6-dialkylamino-1,4-dihydropyrimidines ; 13C-NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The title compounds3 were synthesized by reaction of arlyhydrazono-malononitriles1 with secondary amines and used for subsequent cyclization reactions. Thus,3 undergoes cyclooxidation by treatment with CuSO4/pyridine to form the 5-dialkylamino-2-aryl-1,2,3-triazolo-4-carbonitriles4. From4 a and hydrazine hydrate/DMF the 4-(1,3,4-triazolyl-5)-1,2,3-triazole5 c is obtainable. The chloroacetylation of3 is accompanied by hydrolysis of the amino group to yield the arylhydrazono-N-chloracetyl cyanoacetamides6. The quaternisation of6 with pyridins is followed by the Thorpe cyclization to form the 4-amino-5-arylazo-6-hydroxy-3-pyridinio-pyrid-2-on-chlorides8, useful as cationic dyes. The reaction of3 with trichloroacetonitriles yields the 5-arylazo-4-imino-2-trichlormethyl-1,4-dihydropyrimidines10 a–c which can be converted into the 5-arylazo-2-hydrazino-pyrimidine derivatives10 d–f. From10 d the 6-phenylazo-triazolo[4,3-a]pyrimidine derivative11 is obtainable. From3 and phenylisothiocyanate the 5-arylazo-4-imino-1,4-dihydropyrimidin-2-thiones12 arise. The structures were investigated by13C-NMR-spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809365
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  • 6
    Electronic Resource
    Electronic Resource
    Sealing of bore-holes in Si crystals by epitaxial overgrowth below 560° C (1990)
    Springer
    Applied physics 50 (1990), S. 583-585 
    Details
    ISSN: 1432-0630
    Keywords: 81.10.D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Liquid phase epitaxy (LPE) is applied to seal small bore-holes (diameter 250–400 μm) in Si crystals by lateral overgrowth. The overgrowth layers have a typical thickness of 20 μm, are mechanically stable and gas-tight. Using Ga as solvent for the LPE process the overgrowth can be performed at temperatures as low as 560°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323451
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation, stoichiometry and magnetic properties of Cu y Cr2Se4−z Br x spinels with 0.5≲x≲2 (1974)
    Springer
    Applied physics 4 (1974), S. 147-151 
    Details
    ISSN: 1432-0630
    Keywords: Magnetic semiconductors ; Chromium halochalcogenide spinels ; Curie temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The chemical composition of Cu y Cr2Se4−z Br x spinels depends strongly on the preparation parameters. Spinels with 0.8≲y≲1.2, 0.5≲x≲2, and 0≲z−x≲0.2 have been prepared. Whereas the lattice constanta o of these spinels differs only by less than approximately 0.6%, their Curie temperatureT c depends sensitively on the spinel composition. For Cu1.1Cr2Se3.4Bro.46,a o=1.0410 nm andT c=310 K were found to compared witha 0=1.0447 nm andT c=84 K of CuCr2Se2Br2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00884270
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  • 8
    Electronic Resource
    Electronic Resource
    Histochemical and biochemical determination of calcium in salivary glands of cat (1993)
    Springer
    Histochemistry and cell biology 100 (1993), S. 155-159 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Although feline salivary glands have been used in investigations on secretion and microlithiasis and both processes involve calcium, nothing is known about its distribution in these glands. Therefore we have demonstrated the presence of calcium by a histochemical technique using glyoxal bis(2-hydroxyanil) and a biochemical technique using dry ashing. The histochemical technique stained serous acinar cells weakly and rarely found mucous acinar cells strongly in the parotid gland, mucous acinar cells moderately to strongly and serous acinar cells weakly in the sublingual gland, and central and demilunar acinar cells moderately to strongly in the submandibular gland. The biochemical technique revealed less calcium in the parotid than in the submandibular and sublingual glands. Both techniques revealed a decrease of calcium in submandibular and sublingual glands following parasympathetic stimulation. The histochemical distribution of calcium, which corresponds to that of acinar secretory glycoprotein, and the loss of calcium following parasympathetic stimulation, which causes release of secretory granules, indicate the presence of calcium in secretory granules. The concentration of calcium in the different types of acinar cell corresponds to the acidity of the secretory glycoprotein and suggests that calcium is present as a cationic shield to allow the condensation of polyionic glycoprotein in secretory granules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572902
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  • 9
    Electronic Resource
    Electronic Resource
    Pharmacokinetics of the active metabolite of the prodrug repirinast in healthy Caucasian volunteers after a single oral dose (1992)
    Springer
    European journal of clinical pharmacology 42 (1992), S. 307-312 
    Details
    ISSN: 1432-1041
    Keywords: Pharmacokinetics ; Caucasians ; Repirinast ; Antiallergic drug ; single dose ; oral administration ; metabolite ; BAY w 8199
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of BAY w 8199, the active metabolite of the prodrug repirinast (BAY u 2372), has been investigated after oral administration of 150, 300 and 450 mg repirinast to twelve healthy male Caucasians. Plasma BAY w 8199 concentrations were very variable between subjects. The mean peak level (geom. mean; 1s-range) was 0.14 (0.08–0.25), 0.19 (0.13–0.29) and 0.24 (0.14–0.42) mg/l after the 150, 300 and 450 mg doses, respectively. Peak levels were reached 0.5–2.5 h after drug intake. Terminal half-lives were calculated as 5.9 h (150 mg), 8.0 h (300 mg) and 9.8 h (450 mg). The dose proportionality of the plasma profiles of BAY w 8199 and of its excretion in urine was demonstrated by testing several parameters. About 7.4% of each dose (calculated as BAY w 8199) was excreted in urine over 36 h. The renal clearance of about 27 l/h suggests that BAY w 8199 is excreted by tubular secretion in addition to glomerular filtration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266353
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  • 10
    Electronic Resource
    Electronic Resource
    Action spectra of the light-growth response of Phycomyces (1991)
    Springer
    Planta 184 (1991), S. 498-505 
    Details
    ISSN: 1432-2048
    Keywords: Action spectroscopy ; Blue light ; Light-growth response ; Phycomyces ; Sporangiophore
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The light-growth response of Phycomyces blakesleeanus (Burgeff) is a transient change in elongation rate of the sporangiophore caused by a change in light intensity. Previous investigators have found that the light-growth response has many features in common with phototropism; the major difference is that only the light-growth response is adaptive. In order to better understand the light-growth response and its relationship to phototropism, we have developed a novel experimental protocol for determining light-growth-response action spectra and have examined the effect of the reference wavelength and intensity on the shape of the action spectrum. The null-point action spectrum obtained with broadband-blue reference light has a small peak near 400 nm, a flat region from 430 nm to 470 nm, and an approximately linear decline in the logarithm of relative effectiveness above 490 nm. The shape of the action spectrum is different when 450-nm reference light is used, as has been shown previously for the phototropic-balance action spectrum. However, the action spectrum of the light-growth response differs from that for phototropic balance, even when the same reference light (450 nm) is used. Moreover, for the light-growth response, the relative effectiveness of 383-nm light decreases as the intensity of the 450-nm reference light increases; this trend is the opposite of that previously found for phototropic balance. The dependence of the lightgrowth-response action spectrum on the reference wavelength, its difference from the phototropic-balance action spectrum, and the reference-intensity dependence of the relative effectiveness at 383 nm may be attributable to dichroic effects of the oriented photoreceptor(s), and to transduction processes that are unique to the light-growth response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197898
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