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  • 1
    Electronic Resource
    Electronic Resource
    Bemerkung zu der „Notiz über das Gitter des Triphenylmethans“ von H. Mark und K. Weissenberg (1923)
    Springer
    The European physical journal 17 (1923), S. 351-352 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01328693
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  • 2
    Electronic Resource
    Electronic Resource
    Über die Abhängigkeit der Absorption und Lichtbrechung des Zinnobers von der Temperatur (1921)
    Springer
    The European physical journal 6 (1921), S. 165-173 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung 1. Die Absorptionsgreuze des außerordentlichen Strahles liegt durchschnittlich um 9μμ kurzwelliger als die des ordentlichen. Diesen Abstand behalten die beiden Grenzen auch bei ihrer Verschiebung durch Änderung der Temperatur zwischen + 14° und + 260°. 2. Die Verschiedenheit der Absorption der beiden Strahlen verursacht schwachen Pleochroismus, den man an 0,2 mm dicken Spaltungsplättchen durch Farbenumschlag aus Orangerot für den außerordentlichen, in Dunkelrot für den ordentlichen Strahl beobachten kann. 3. Im Sinne der Koenigsbergerschen Regel wandert die Absorption für 1° Temperaturerhöhung um 0,29μμ nach langen Wellenlängen. 4. Die Lichtbrechung des Zinnobers wurde an fünf Prismen verschiedener Fundorte bei gewöhnlicher Temperatur und an einem Prisma aus Material von Almaden, Spanien, zwischen −123 und +263° gemessen. 5. Kristalle verschiedener Fundorte besitzen nicht dieselbe Lichtbrechung. Da an solchen von Mexiko zonarer Bau zu beobachten war, scheinen die Brechungsunterschiede auf Beimengungen zu beruhen, die aus der Analysenliteratur nicht ersichtlich und daher wohl kaum chemisch nachweisbar sind. 6. Die Temperaturkoeffizienten der Lichtbrechung wachsen von 0,12 bis 1,65 Einheiten der vierten Dezimale für den ordentlichen und von 0,67 bis 3,11 für den außerordentlichen Strahl bei Annäherung an das Absorptionsgebiet. 7. Am Zinnober bestätigt sich die Babinetsche Regel, daß der stärker absorbierte Strahl auch die höhere Lichtbrechung besitzt, nicht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01327976
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  • 3
    Electronic Resource
    Electronic Resource
    Lattice varieties with non-elementary amalgamation classes (1999)
    Springer
    Algebra universalis 41 (1999), S. 317-336 
    Details
    ISSN: 1420-8911
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. In this paper it is shown that under certain general conditions, if the amalgamation class of a lattice variety contains a member which does not have a 2-congruence, then the amalgamation class is not closed under ultrapowers or direct products. In particular, the amalgamation class is not first order axiomatizable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000120050117
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal effects of contamination, adsorbed water and annealing on the DTA of powdered quartz (1979)
    Springer
    Journal of thermal analysis and calorimetry 15 (1979), S. 37-45 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Lors du broyage du quartz, il se produit une adsorption de l'eau atmosphérique mais cette eau ne donne pas d'effet thermique décelable par ATD car elle se dégage régulièrement jusqu'à 1000°. Cependant, en présence de fer comme contaminant, l'eau adsorbée intervient dans une réaction d'oxydation qui donne des effets thermiques perceptibles dans le cas de quartz pulvérisé dans un vibrobroyeur en acier. Si le quartz est en poudre assez fine pour que le pic d'inversion α-β à 573° disparaisse, le recuit provoque la réapparition partielle du pic. La recristallisation du quartz est cependant trop faible pour donner un effet exothermique décelable par ATD.
    Abstract: Zusammenfassung Während des Vermahlens von Quartz wird Wasser aus der Atmosphäre adsorbiert, jedoch ergab dieses Wasser keinen nachweisbaren thermischen Effekt in der DTA, da es bis zu 1000° gleichmässig freigesetzt wird. Im Zusammenhang mit einer Eisen-Verunreinigung wurde jedoch das adsorbierte Wasser in eine Oxidationsreaktion einbezogen, welche beim in einer aus Stahlteilen gefertigten Vibrationsmühle zerpulvertem Quartz nachweisbare thermische Effekte verursachten. Wenn so fein pulverisiert wurde, daß der α-β-Inversions-Peak bei 573° verschwunden war, verursachte eine Wärmebehandlung eine teilweise Wiederentwicklung des Peaks, jedoch war die Rekristallisation des zerstörten Quartzes zu geringfügig um einen nachweisbaren exothermen Peak in der DTA-Kurve zu ergeben.
    Notes: Abstract During the grinding of quartz, water is adsorbed from the atmosphere, but this water gave no detectable thermal effect on DTA because it was evolved uniformly up to 1000°. However, in conjunction with an iron contaminant, the adsorbed water was involved in an oxidation reaction causing noticeable thermal effects for quartz powdered in a vibration mill constructed of steel parts. When powdered so finely that the α-β inversion peak at 573° had disappeared, annealing caused a partial redevelopment of the peak but recrystallization of disrupted quartz was too small an effect to give any detectable exothermic peak on DTA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01910196
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of catecholamine uptake2 in isolated cardiac myocytes (1996)
    Springer
    Molecular and cellular biochemistry 163-164 (1996), S. 181-183 
    Details
    ISSN: 1573-4919
    Keywords: catecholamine uptake2 ; isolated cardiomyocytes ; membrane potential ; noradrenaline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Extraneuronal catecholamine uptake was investigated in isolated quiescent rat myocardial cells. By administration of (3H-)(−)noradrenaline concentration of 22 nmol/l up to 1000 μmol/l the following data were obtained: (1) The KM of the uptake process amounted to 260 μmol/l, the Vmax to 4.24 nmol/(10 min × mg Protein) corresponding to 179 nmol/(min × gWWt)(WWT = Wet Weight). (2) The uptake was largely inhibited by the uptake2-inhibitors corticosterone (100 μmol/l), isoprenaline (IC so = 30.6 μmol/l), and O-methylisoprenaline (IC50 = 2.1 pmol/l), but not by the uptake1-inhibitors cocaine (100 μmol/l) and desipramine (10 μmol/l). (3) The ‘affinity’-values KM and IC50 closely agreed with those already known, but the Vmax-value was higher than those obtained in whole rat hearts by a factor of at least 1.79. This is caused presumably by the voltage dependence of the uptake mechanism and the resulting inhibition of uptake 2 during the periods of depolarisation in beating hearts of other studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408656
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  • 6
    Electronic Resource
    Electronic Resource
    Is fatty acid uptake in cardiomyocytes determined by physicochemical fatty acid partition between albumin and membranes? (1989)
    Springer
    Molecular and cellular biochemistry 88 (1989), S. 31-36 
    Details
    ISSN: 1573-4919
    Keywords: Fatty-acid ; uptake ; albumin-receptor ; membrane-compartment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Palmitate uptake by isolated, calcium-resistant cardiomyocytes was measured by using a stimulation chamber in which cell contraction can be evoked electrically. Experiments were performed in a medium containing physiological interstitial concentration of albumin (2%) and palmitate/albumin (P/A) ratios ranging from 0.03 to 2.5, and were compared to experiments with fixed P/A ratio (− 1). Initial rate of uptake (Vi) was calculated from fitted uptake vs. time curves as measured by accumulation of radioactivity in the cells from 14C-labelled palmitate. Vi-vs.-concentration curves exhibited a saturable component, if albumin concentration was kept constant. Almost no change in Vi was observed in experiments performed at constant P/A. This is in contrast to the albumin receptor hypothesis. The 14C-palmitate content of the myocytes as estimated by thin-layer-chromatography did reach a plateau at ⩽30 s and had the same value at 30 min after administration. The cellular content of labelled palmitate could be attributed to the membrane compartment as calculated from partition coefficient (Kc) of fatty acids (FA) between albumin and membranes. With electrical stimulation Vi-vs.-palmitate concentration kinetics showed a shift in apparent Km from 62 µM (P/A − 0.22) to 23 µM (P/A = 0.08), and presence of 2,4-dinitrophenol increases Vi. Our results suggest that FA-transfer across the sarcolemmal membranes is determined by a physicochemical equilibrium between the compartments of extracellular FA-albumin complex, the membrane lipid phase, intracellular FA binding proteins and the respective aqueous phases. Consequently in cell suspensions the rate of palmitate uptake is controlled by a step of fatty acid metabolism possibly the formation of Fa CoA by the enzyme FA acyl CoA synthetase which is localized in membranes of endoplasmatic reticulum and mitochondria. This step is influenced by the metabolic state of the cells and by FA concentration in membranes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223420
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  • 7
    Electronic Resource
    Electronic Resource
    Anreicherungsverfahren zum Nachweis geringer Mengen chemischer Bestandteile in Mineralien (1935)
    Springer
    Naturwissenschaften 23 (1935), S. 354-355 
    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/BF01497905
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  • 8
    Electronic Resource
    Electronic Resource
    Ein grün verfärbbarer Amethyst (1954)
    Springer
    Naturwissenschaften 41 (1954), S. 448-448 
    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/BF00628871
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Trennung der Ceroxyde von der Thorerde (1864)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 3 (1864), S. 369-370 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01346099
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  • 10
    Electronic Resource
    Electronic Resource
    Chrom (1937)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 109 (1937), S. 436-441 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01442424
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