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  • 1980-1984  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Mathematik 89 (1980), S. 69-76 
    ISSN: 1436-5081
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Let Λ be a lattice inR n . Consider the systemS of unit spheres centered at the lattice points of Λ.S is called ak-fold lattice packing (covering) if each point inR n lies in at most (least)k of the open (closed) spheres ofS. Letd k n (D k n ) be the density of the closest (thinnest)k-fold lattice packing (covering) ofR n . After dealing several cases left by G. Fejes Tóth and A. Florian, we have concluded thatd k n 〉kd 1 n for all (n, k) (n≥2,k≥2) except (2, 2), (2, 3), (2, 4); andD k 3 〈k D 1 3 for allk≥2.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Investigational new drugs 1 (1983), S. 197-202 
    ISSN: 1573-0646
    Keywords: nitrosourea ; cytotoxicity ; repair ; carbamoylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The survival response of human colorectal carcinoma cells treated in vitro for 1 h with PCNU was characterized by a threshold exponential curve, Dq = 8 μg/ml (1 h) and D 0 = 22 μg/ml (1 h). Continuous treatment induced decreasing degrees of cell kill although PCNU was biologically stable in solution for at least 24 h. Cells treated with PCNU were unable to recover from potentially lethal damage but were quite capable of repairing PCNU-induced sublethal damage. Thus, PCNU with different alkylating and carbamoylating than other nitrosourea congeners had similar cytotoxic and repair inhibition capacities. Any therapeutic gain in the clinical use of PCNU must derive only from its lipophilic properties and not from its superior activity at the cellular level.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The test results of 320 units of a laser initiated microdetonator are summarized. The commercially fabricated units used a lead styphnate/lead azide/HMX (1 mg/17.5 mg/13.5 mg) explosive train design contained in a miniature aluminum can that was capped with a glass-metal seal window. The test parameters were the laser energy, temperature, laser pulse duration, laser wavelength and nuclear radiation (5 × 106 rad of 1 MeV gamma rays). The performance parameters were the laser energy for ignition and the actuation response time.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 22 (1984), S. 1789-1796 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Efforts to prepare triphenylsulfonium hexafluorophosphate by metathesis between commercially available “triphenylsulfonium chloride” and potassium hexafluorophosphate failed to yield the expected product but gave, instead, in approximately 50% yield, a crystalline substance with well-defined properties readily distinguishable from triphenylsulfonium hexafluorophosphate. The unexpected substance is identified as bis-[4(diphenylsulfonio)phenyl]sulfide-bis-hexafluorophosphate, for which no previous reference has been found in the literature. Its identification is based on elemental analysis, NMR, mass spectrometry, and infrared analysis. Bis-[4-(diphenylsulfonio)phenyl]sulfide-bis-hexafluorophosphate was also prepared by the reaction of benzene with sulfur monochloride in the presence of aluminum chloride and chlorine, followed by addition of potassium hexafluorophosphate. The product is an effective photonitiator for the crosslinking of epoxide resins.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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