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  • 1990-1994  (2)
  • 1975-1979  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Inner-shell ionization by relativistic electron impact (1979)
    Springer
    The European physical journal 293 (1979), S. 187-201 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract K-, L andM-shell ionization cross sections have been measured for 23 elements, 12≦Z≦92, after bombardment with relativistic electrons, 15≦E 065MeV, by means of high resolution semiconductor detectors and a recently developed gas-scintillation proportional counter. For constant electron bombarding energyE 0 the ionization cross sections follow a power law dependence,σ∽Z −α, and forE 0=50MeV we deducedα =2.45±0.02 for theK shell andα=3.00 ±0.09 for theL shell. The observedZ dependence exhibits significant systematic deviations from theoretical predictions which exceed the experimental values up to 15 % at lowZ elements for theK shell and on the average about 11% for theL andM shell. The same behaviour of too low experimental values, i.e. an overestimation by the theory, is observed for the energy dependence of the cross sections for all shells. A scaling behaviour describing theZ andE 0 dependence for allK-, L andM-shell data points is observed which also predicts the experimental values by other groups at lower and higher energies correctly. The comparsion of the measuredLΒ/Lα, andLγ/Lα intensity ratios for highZ elements with the values obtained by other groups in the energy range 0.3≦E0≦1,000 MeV exhibits an increase with bombarding energy that cannot merely be explained by the energy dependence of the subshellionization cross sections for theL shell. An attempt to explain this effect with the change of the Coster-Kronig transition probability is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435588
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  • 2
    Electronic Resource
    Electronic Resource
    Detection of p53 mutations using nonradioactive SSCP analysis: p53 is not frequently mutated in myelodysplastic syndromes (MDS) (1993)
    Springer
    Annals of hematology 67 (1993), S. 223-226 
    Details
    ISSN: 1432-0584
    Keywords: MDS ; PCR ; p53 ; Nonradioactive SSCP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary p53 is one of the most frequently mutated genes in human cancers. Since p53 has been implicated in lymphatic and some myeloid leukemias, such as the blastic phase of chronic myelogeneous leukemia, we sought to address the role of p53 gene mutations within exons 4–9 in myelodysplastic syndromes (MDS), a myeloid preleukemic condition. In order to avoid the potential hazard of using radioactive single-strand conformation analysis (SSCP), we used a nonradioactive SSCP method based on the silver stain of small minigels. In cell lines with known point mutations of the p53 gene, aberrant migrating bands were found. Serial dilutions indicated a sensitivity comparable to radioactive methods. Furthermore, a common polymorphism within the 4th exon of the p53 gene was easily detected. However, of 17 primary samples from patients with MDS, none harbored a p53 gene mutation. We conclude that this nonradioactive method can easily be used to screen for p53-gene mutations, and that p53-gene mutations do not play a major role in the pathogenesis of MDS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01715051
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  • 3
    Electronic Resource
    Electronic Resource
    Thermisches Verhalten und Hydratbildung von CoX2 · 2C5H5N (X : Cl-, Br-, J-) (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 447 (1978), S. 161-170 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermal Properties and Formation of Hydrates of CoX2 · 2C5H5N (X : Cl-, Br-, I-)The thermal decomposition of the compounds CoX2 · 2C5H5N (X : Cl-, Br-, I-) is reinvestigated. CoBr2 · C5H5N is described for the first time. In an atmosphere saturated with water vapor CoX2 · 2C5H5N (X : Cl-, Br-) reacts to CoX2 · 2C5H5N · 4 H2 O (X : Cl-, Br-). The thermal, magnetic, and UV spectroscopic properties of these compounds are communicated.
    Notes: Der thermische Abbau der Verbindungen CoX2 · 2 C5H5N (X : Cl-, Br-, J-,) wird erneut untersucht. Dabei läßt sich das bisher unbekannte, CoBr2 · C5H5N isolieren. In einer mit Wasserdampf gesättigten Atmosphäre werden CoX2 · 2C5H5N (X : Cl-, Br-,) zu den isostrukturellen Hydraten CoX2 · 2C5H5N · 4 H2 (X : Cl-, Br-,) umgesetzt. Das thermische magnetische und UV-spektroskopische Verhalten dieser Verbindungen wird ebenfalls mitgeteilt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784470118
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  • 4
    Electronic Resource
    Electronic Resource
    Die Perthioborate RbBS3, TIBS3 und TI3B3S10Professor Harald Schäfer zum 80. Geburtstage gewidmet. (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 109-116 
    Details
    ISSN: 0044-2313
    Keywords: Perthioborates, RbBS3, TlBS3, Tl3B3S10 ; preparation ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Perthioborates RbBS3, TIBS3, and Tl3B3S10.RbBS3 (P21/c, a=7.082(2) Å, b=11.863(4) Å, c=5.794(2) Å, β=106.54(2)°) was prepared as colourless, plate-shaped crystals by reaction of stoichiometric amounts of rubidium sulfide, boron, and sulfur at 600°C and subsequent annealing. TlBS3 (P21/c, a=6.874(3) Å, b=11.739(3) Å, c=5.775(2) Å, β=113.08(2)°) which is isotypic with RbBS3 was synthesized from a sample of the composition Tl2S · 2 B2S3. The glassy product which was obtained after 7 h at 850°C was annealed in a two zone furnace for 400 h at 400→350°C. Yellow crystals of TlBS3 formed at the warmer side of the furnace.Tl3B3S10 (P1, a=6.828(2) Å, b=7.713(2) Å, c=13.769(5) Å, α=104.32(2)°, β=94.03(3)°, γ=94.69(2)°) was prepared as yellow plates from stoichiometric amounts of thallium sulfide, boron, and sulfur at 850°C and subsequent annealing.All compounds contain tetrahedrally coordinated boron. The crystal structures consist of polymeric anion chains. In the case of RbBS3 and TlBS3 nonplanar five-membered B2S3 rings are spirocyclically connected via the boron atoms. To obtain the anionic structure of Tl3B3S10 every third B2S3 ring of the polymeric chains of MBS3 is to be substituted by a six-membered B(S2)2B ring.
    Notes: Farblose, plättchenförmige Kristalle von RbBS3 (P21/c, a=7,082(2) Å, b=11,863(4) Å, c=5,794(2) Å, β=106,54(2)°) entstehen aus einem stöchiometrischen Ansatz von Rubidiumsulfid, Bor und Schwefel bei 600°C und anschließendem Tempern. Die zu RbBS3 isotype Phase TlBS3 (P21/c, a=6,874(3) Å, b=11,739(3) Å, c=5,775(2) Å, β=113,08(2)°) erhält man aus dem Ansatz Tl2S · 2 B2S3. Das nach 7 h bei 850°C erhaltene glasige Produkt wird in einem Zweizonenofen 400 h bei 400→350°C ausgelagert. Gelbe Kristalle der Verbindung bilden sich in der wärmeren Ofenzone. Das ebenfalls gelbe Tl3B3S10 (P1, a=6,828(2) Å, b=7,713(2) Å, c=13,769(5) Å, α=104,32(2)°, β=94,03(3)β, γ=94,69(2)°) bildet sich aus stöchiometrischen Mengen von Thalliumsulfid, Bor und Schwefel bei 850°C und anschließendem Tempern.Die ausschließlich tetraedrisch koordiniertes Bor enthaltenden Verbindungen bilden polymere Kettenstrukturen, die sich im Fall des RbBS3 und TlBS3 aus spirocyclisch über die Boratome verknüpften, nichtplanaren Trithiadiborolan-Ringen aufbauen. Ersetzt man in diesen Anionenketten jeden dritten B2S3-Fünfring durch einen B(S2)2B-Sechsring, so erhält man die Anionenstruktur des Tl3B3S10.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190118
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