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  • 1
    Electronic Resource
    Electronic Resource
    Sphingomonads from marine environments (1999)
    Springer
    Journal of industrial microbiology and biotechnology 23 (1999), S. 268-272 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: marine; Sphingomonas; phylogeny; oligotroph
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Sphingomonas species play an important role in the ecology of a range of marine habitats. Isolates and 16S-rRNA clones have been obtained from corals, natural and artificial sources of marine hydrocarbons and eutrophic and oligotrophic waters, and have been isolated as hosts for marine phages. In addition they are found in oceans spanning temperature ranges from polar to temperate waters. While less is known about marine sphingomonads in comparison to their terrestrial counterparts, their importance in microbial ecology is evident. This is illustrated by, for example, the numerical dominance of strain RB2256 in oligotrophic waters. Furthermore, the known marine sphingomonads represent a phylogenetic cross-section of the Sphingomonas genus. This review focuses on our present knowledge of cultured isolates and 16S-rDNA clones from marine environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900732
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  • 2
    Electronic Resource
    Electronic Resource
    Performance of Connectionless Data Service in High Density Microcell (1997)
    Springer
    Wireless personal communications 4 (1997), S. 207-216 
    Details
    ISSN: 1572-834X
    Keywords: wireless ; microcell ; packed ; data ; CDPD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Two categories of commercial wireless packet services exist today – a standalone system where the entire bandwidth is dedicated to the transmission of data packets (e.g. ARDIS, Mobitex), and an overlay system, where the unused channels of an existing cellular phone system are used (e.g. CDPD, GPRS). This paper examines the performance of the overlay service in a high density Manhattan street grid microcell. This type of cell is common in central urban areas. A simple analytical model is derived to describe the channel occupancy distribution in the microcell. The model is used to examine the performance of CDPD, a connectionless data service operating over a cellular system. Throughput and latency are evaluated under the two existing channel assignment schemes currently in use. A new assignment scheme is proposed, and is found to give better performance with minimal changes to the CDPD specification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008869013540
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On detection of high-energy neutrinos from sources of gamma-ray bursts (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 339-341 
    Details
    ISSN: 1572-946X
    Keywords: Gamma-ray bursts ; High-energy neutrinos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that, contrary to a recent suggestion, fluxes of ∼ 30 GeV-1 TeV neutrinos that may accompanyγ-ray bursts are at least a few orders of magnitude too weak to be detected by the current or planned neutrino detectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658646
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sixty percent salvage rate for germ-cell tumours using sequential m-BOP, surgery and ifosfamide-based chemotherapy (1999)
    Springer
    Annals of oncology 10 (1999), S. 685-692 
    Details
    ISSN: 1569-8041
    Keywords: cisplatin ; dose dense ; germ-cell tumour ; salvage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: In germ-cell tumours (GCT), there is continuing controversy over the relative merits of dose dense therapy (increased frequency over a given time) versus vertical intensification (increased dose per fraction). The value of using a cisplatin-based dose dense approach in the salvage setting has not been documented and in addition the role of methotrexate remains uncertain. This paper reviews results from our investigations of these issues. Patients and methods: Between 1987 and 1996, 65 patients with relapsing or refractory germ-cell tumour received weekly m-BOP (methotrexate, bleomycin, vincristine and cisplatin) as salvage therapy. Residual masses were excised if possible and patients progressing after this received cisplatin and ifosfamide based chemotherapy with or without high dose chemotherapy (HDCT) consolidation. Results: With a median follow-up of 33 months, 34% are progression free following m-BOP, 11% who had surgery for residual masses which showed viable cancers are progression free. A further 15% who progressed following m-BOP with or without surgery were rendered progression free by third-line therapy. Conclusions: The use of m-BOP as second line therapy with deferment of cisplatin and ifosfamide based treatment to third line therapy with consolidation of third line responses with HDCT, leads to an overall progression-free survival of 60%. It does not appear that M-BOP prejudiced the response to third line therapy suggesting a lack of cross resistance. The potentially lower risk of leukaemia and infertility from m-BOP requires further evaluation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008318612005
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  • 5
    Electronic Resource
    Electronic Resource
    Cosmic-ray diffusive acceleration at shock waves with finite upstream and downstream escape boundaries (1996)
    Springer
    Solar physics 167 (1996), S. 381-394 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the present paper we discuss the modifications introduced into the first-order Fermi shock acceleration process due to a finite extent of diffusive regions near the shock or due to boundary conditions leading to an increased particle escape upstream and/or downstream of the shock. In the simple example of the planar shock wave considered we idealize the escape phenomenon by imposing a particle escape boundary at some distance from the shock. The presence of such a boundary (or boundaries) leads to coupled steepening of the accelerated particle spectrum and decreasing of the acceleration time scale. It allows for a semi-quantitative evaluation and, in some specific cases, also for modelling of the observed steep particle spectra as a result of the first-order Fermi shock acceleration. We also note that the particles close to the upper energy cut-off are younger than the estimate based on the respective acceleration time scale. In Appendix A we present a new time-dependent solution for infinite diffusive regions near the shock allowing for different constant diffusion coefficients upstream and downstream of the shock.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146347
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Cosmic-Ray Momentum Diffusion in Magnetosonic versus Alfvénic Turbulent Field (1999)
    Springer
    Solar physics 184 (1999), S. 339-352 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Energetic particle transport in a finite amplitude magnetosonic and Alfvénic turbulence is considered using the Monte Carlo particle simulations, which involve integration of particle equations of motion. We show that in the low-β plasma the cosmic-ray acceleration can be the most important damping process for magnetosonic waves. Assuming such conditions we derive the momentum diffusion coefficient Dp, for relativistic particles in the presence of anisotropic finite-amplitude turbulent wave fields, for flat and Kolmogorov-type turbulence spectra, respectively. We confirm the possibility of larger values of Dp occurring due to transit-time damping resonance interaction in the presence of isotropic fast-mode waves in comparison to the Alfvén waves of the same amplitude (cf. Schlickeiser and Miller, 1997). The importance of quasi-perpendicular fast-mode waves is stressed for the acceleration of high velocity particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005028205111
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    Paper (German National Licenses)
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