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  • 1
    Electronic Resource
    Electronic Resource
    Endocellular distribution of calcium and Ca-ATPases in horse-bean roots: Possible relation to the ecological status of the plant (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 55 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The endocellular distribution of calcium has been determined and Ca-ATPase activity measured in subcellular fractions of various species: horse-bean (Vicia faba L., var. minor), barley (Hordeum vulgare L., var. Astrix), wheat (Triticum vulgare L., var. Hardy), lupine (Lupinus luteus L., var. Weiko III), oat (Avena sativa L. var. Zelma) which grow differently on calcareous media. The vacuolar calcium concentrations are below thermodynamic equilibrium with the medium for all plants. The deficit in vacuolar calcium is accentuated in plants which prefer calcareous soils. Membranes of such plants show weak affinity for calcium and also considerable Ca-ATPase activity. It is suggested that low vacuolar concentration is a consequence of low cytoplasmic concentration. The role of Ca-ATPases and the physicochemical properties of membranes in counteracting high external calcium is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb04525.x
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of intracellular potassium activity in protoplasts of Acer pseudoplatanus: origin of their electropositivity (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 57 (1983), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Membrane resistances, electrical potentials and intracellular K+ activity have been studied in protoplasts of Acer pseudoplatanus L. using microelectrodes. The plasmalemma appears to be damaged during protoplast processing, so that it is almost completely depolarized. The positive polarization of the protoplasts is a property of their tonoplast. The osmotic shock of general dilution of the medium brings about a slight positive polarization of the protoplasts, which probably is the consequence of a dilution of the ionic contents of the cell. A rapid dilution of extracellular potassium produces the same effect by a considerable efflux of K+, which changes the concentration gradient so that electropositivity is accentuated. In general, certain states of shock can cause such polarization. These results, particularly the development of internal potassium activity, help in understanding the initial cause of the positive polarization that is sometimes observed in protoplasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1983.tb00900.x
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  • 3
    Electronic Resource
    Electronic Resource
    Infantile hepatic hemangioendothelioma with subsequent malignant degeneration (1981)
    Springer
    Pediatric radiology 11 (1981), S. 42-45 
    Details
    ISSN: 1432-1998
    Keywords: Hemangioendothelioma, hepatic ; Hemangioendothelioma, malignant degeneration ; Angiosarcoma, hepatic ; Neoplasm, hepatic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A 4 year old child was seen because of an enlarging epigastric mass and a rapidly falling hematocrit 31/2 years following steroid treatment for multiple hepatic hemangioendotheliomas. Technetium 99 m sulfur colloid liver scan and hepatic angiography confirmed the presence of a large, vascular mass involving the left lobe of the liver. A left hepatic lobectomy was performed and histopathology showed angiosarcoma. As children with hemangioendotheliomas of the liver begin to survive for longer periods of time, surveillance for the possible development of neoplastic disease is recommended.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972043
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  • 4
    Electronic Resource
    Electronic Resource
    Massenspektrometrische Untersuchung des Substituenteneffektes bei einfach substituierten Benzophenonen (1974)
    Springer
    Monatshefte für Chemie 105 (1974), S. 787-795 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ionization potentials of benzophenone and six meta- and parasubstituted benzophenones have been measured and correlated withBrown σ +-constants. The ρ-value of this correlation gives evidence that the ionization process of benzophenones is similar to the ionization process of compounds with one benzene ring: removal of an electron from the π-electron system. Appearance potentials of the benzoyl ions and the corresponding six substituted benzoyl ions have been determined and correlated withHammett σ-constants. The deviations of ions with the substituents m-NH2 and p-NH2 from the correlation line are mainly due to the kinetic shift of these ions. For the decomposition of benzophenone ions to benzoyl ions the correlation of metastable-ion intensities withHammett σ-constants shows a similar ρ-value as the correlation of the intensities of the decomposition in the ion source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00912977
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  • 5
    Electronic Resource
    Electronic Resource
    Uriniferous perirenal pseudocyst (1980)
    Springer
    Pediatric radiology 9 (1980), S. 43-44 
    Details
    ISSN: 1432-1998
    Keywords: Uriniferous perirenal pseudocyst ; Urinoma ; Pseudocyst, perirenal ; Calcification, abdominal ; Mass, abdominal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Radiologically visible calcification in the wall of a uriniferous perirenal pseudocyst is rare. This unusual finding was seen in a newborn infant who was found to have a left flank mass on the first day of life. When perirenal pseudocysts occur in infants, they are usually caused by congenital obstructive lesions of the urinary tract.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00973970
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  • 6
    Electronic Resource
    Electronic Resource
    Alleviation of the stress concentration with analogue reinforcement (1973)
    Springer
    Experimental mechanics 13 (1973), S. 519-525 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In order to reduce the stress concentration around a hole in a plate, new, “analogue” reinforcements instead of reinforcing rings were used in this investigation. In two of these specimens, reinforcements with different volume fractions were arranged to coincide with the stress trajectories for an infinite plate with a hole under uniaxial tension. Two other specimens containing straight rectangular-grid-type reinforcements were made by using a photofabrication method. Specimens were then prepared by sandwiching these reinforcements between two epoxy-resin plates. Plane specimens, i.e., without reinforcement, were also made of the same epoxy resin for comparison. The stress concentrations at the edge of the hole under uniaxial tension were determined by photoelastic techniques. The measured stress-concentration factors were compared with well-known values for an infinite, isotropic, homogeneous plate containing a hole. Results were also compared with published data on [90/0/90/0]s 7-ply laminated composite plates, and on plates strengthened with reinforcing rings. A definite reduction in stress concentration was observed on specimens containing analogue reinforcement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02322340
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  • 7
    Electronic Resource
    Electronic Resource
    Massenspektrometrische Untersuchungen an Benzophenon und Substituierten Benzophenonen. I-Ermittlung Thermodynamischer Grössen (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1974), S. 998-1005 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ionisation potentials of benzophenone and nine substituted benzophenones, and appearance potentials of the most abundant fragment ions have been determined. Starting from calculated heats of formation of the substituted benzophenones, the following quantities have been evaluated; heats of formation of the molecular ions; heats of formation of fragment ions formed via a one-step pathway and via a two-step pathway; heats of formation and ionisation potentials of radicals; heats of dissociation of benzophenone and substituted benzophenones. The accuracy of the result is discussed.
    Notes: Es wurden die Ionisieerungspotentiate von Benzophenon und substituierten Benzophenonen sowie die Auftrittspotentiale der häufigsten Fragment-Ionen gemessen. Ausgehend von berechneten Werten für die Bildungsenthalpien der substituierten Benzophenone, wurden folgende Grüßen ermittelt: Bildungsenthalpien der Molekül-Ionen; Bildungsenthalpien von Fragment-Ionen, die in einem einstufigen, und solcher, die in einem zweistufigen Zerfallsprozeß gebildet wurden; Bildungsenthalpien und Ionisierungspotentiale von Radikalen; Dissoziationsenergien des Benzophenons und der substituierten Benzophenone. Die Genauigkeit der Ergebnisse wird diskutiert.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210091006
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  • 8
    Electronic Resource
    Electronic Resource
    Massenspektrometrische Untersuchungen an Benzophenon und Substituierten Benzophenonen. II - Berechnung von Ionenhäufigkeiten (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1974), S. 1134-1147 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Clastograms of benzophenone and nine substituted benzophenones have been calculated in the range of 12 to 24 eV, using the simplest equation of the quasi-equilibrium theory. The calculations consider competing and consecutive reactions. The energy distribution function used by Yeo and Williams has been slightly modified with regard to the measured clastogram of benzophenone. Good agreement is obtained between calculated and measured clastograms. The calculations confirm the presumption of preliminary work, that benzoyl and aminobenzoyl ions from aminobenzophenones are formed with considerable excess energy at the threshold.
    Notes: Mit Hilfe der einfachsten Gleichung der Quasi-Gleichgewichts-Theorie wurden die Klastogramme von Benzophenon und neun substituierten Benzophenonen im Bereich von 12 bis 24 eV berechnet. Es wurden Konkurrierende Reaktionen und Folgereaktionen berücksichtigt. Die Energieverteilungsfunktion von Yeo und William wurde auf Grund der Ergebnisse, die für Benzophenon erhalten wurden, modifiziert. Berechnete und gemessene Klastogramme stimmen gut überein. Die Berechnungen bestätigen die aus anderen Arbeiten gewonnene Vermutung, daß Benzoylund Aminobenzoyl-Ionen aus Aminobenzophenonen an der Bildungsschwelle mit einer beträchtlichen Überschußenergie behaftet sind.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210091109
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