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  • Carbon beam  (1)
  • Cryptonemia  (1)
  • Inorganic Chemistry  (1)
  • Life Sciences  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Radiation and environmental biophysics 38 (1999), S. 229-237 
    ISSN: 1432-2099
    Schlagwort(e): Key words Ions ; Tumor therapy ; RBE ; Track structure ; Treatment planning ; Carbon beam
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract  The elevated relative biological effectiveness (RBE) of heavy ions like carbon is the main reason for their use in radiotherapy and is due to the microscopic distribution of dose inside each particle track. High local doses produce lesions that are expected to have a diminished possibility of repair. Thus, RBE depends on track structure and on the biological repair capacity of the tissue that is affected by the irradiation. For tumor treatment planning with heavy ions, the beam quality and the tissue sensitivity have to be taken into account. Using the dependence of radial dose distribution on particle energy and atomic number on the physical side and x-ray dose response for the repair capacity on the biological side, the response to particle irradiation can be calculated in the local effect model (LEM) and used for treatment planning. This article traces the route from electron emission as the basis of track structure to the RBE calculation and the application in treatment planning.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1615-6102
    Schlagwort(e): Cryptonemia ; Pit connection ; Red algae ; Transfer cell
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The thick and anatomically complex stalks of a Western Australian species ofCryptonemia (Cryptonemiales, Rhodophyta) are characterized by growth rings in cross-section. Cells of the medulla may die as the diameter of the stalks increases to maximum widths of over 2 centimeters, the remaining cell walls appearing to function as purely supportive tissue (a phenomenon hitherto unreported in the red algae). All cells of the stalk are enclosed by thick, compact cell walls and are interconnected by pit connections which become progressively more convoluted and fluted with increasing distance of the cells from the stalk surface. This is the first report of such a pit-connection morphology. It is suggested that the modification may serve to aid transport of solutes towards the more deeply-buried layers of living cells.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 11 (1991), S. 183-183 
    ISSN: 0138-4988
    Schlagwort(e): Life Sciences ; Life Sciences (general)
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 334 (1964), S. 15-20 
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: The precipitation of diphosphate from solutions of secondary alkali diphosphates by means of Ba2+ yields the acid salt Ba7H2P8O28·6H2O. With increasing alkalinity of the solutions, the hydrogen ion content of the Ba salt precipitate decreases. Precipitation from Na4-diphosphate solutions yields the neutral Ba2P2O7·1,5 H2O. From X-ray investigations (no structural differences between the two precipitates being found) it in concluded that the “neutral” Ba diphosphate has a phase range from Ba:H = 2:0 to 7:2.
    Notizen: Ba2+ bildet-im Unterschied zu vielen anderen zweiwertigen Metallen-bei der Fällung aus Lösungen sekundärer Diphosphate ein saures Diphosphat, Ba7H2P8O28·6H2O. Mit steigender Alkalität der Fällungslösung nimmt die Acidität der Ba-Verbindung ab. Das neutrale Na-Diphosphat entsteht nur bei der Fällung aus quaternären Diphosphat-Lösungen. Bemerkenswerterweise besteht kein struktureller Unterschied zwischen den sauren Verbindungen und dem quaternären Salz, was zu der Annahme führt, daß das quaternäre Ba-Diphosphat eine Phasenbreite zwischen Ba:H = 2:0 und 7:2 besitzt.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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