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  • 1
    Digitale Medien
    Digitale Medien
    Development and characterization of semiconductor ion detectors for plasma diagnostics in the range over 0.3 keV : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 324-327 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: For the purpose of plasma-ion-energy analyses in a wide-energy range from a few hundred eV to hundreds of keV, upgraded semiconductor detectors are newly fabricated and characterized using a test-ion-beam line from 0.3 to 12 keV. In particular, the detectable lowest-ion energy is drastically improved at least down to 0.3 keV; this energy is one to two orders-of-magnitude better than those for commercially available Si-surface-barrier diodes employed for previous plasma-ion diagnostics. A signal-to-noise ratio of two to three orders-of-magnitude better than that for usual metal-collector detectors is demonstrated for the compact-sized semiconductor along with the availability of the use under conditions of a good vacuum and a strong-magnetic field. Such characteristics are achieved due to the improving methods of the optimization of the thicknesses of a Si dead layer and a SiO2 layer, as well as the nitrogen-doping technique near the depletion layer along with minimizing impurity concentrations in Si. Such an upgraded capability of an extremely low-energy-ion detection with the low-noise characteristics enlarges research regimes of plasma-ion behavior using semiconductor detectors not only in the divertor regions of tokamaks but in wider spectra of open-field plasma devices including tandem mirrors. An application of the semiconductor ion detector for plasma-ion diagnostics is demonstrated in a specially designed ion-spectrometer structure. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1147923
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of new semiconductor detectors for x-ray tomography in the ASDEX Upgrade Tokamak and its generalized physics interpretations : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 774-777 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The energy response of a new semiconductor detector in the ASDEX Upgrade Tokamak for plasma x-ray tomography studies is characterized using synchrotron radiation from a 2.5 GeV positron storage ring at the National Institute for High Energy Physics in Japan. This international collaborating research clarifies a fairly good agreement between the x-ray energy response data and our recently proposed theoretical predictions for such a semiconductor x-ray-detector response. The x-ray response for several positions on the active area of the detector unit is studied; a good uniformity observed guarantees that the detector can employ any sized and shaped collimator for the x-ray tomography regardless of any correction factor coming from the response nonuniformity on the detector active area. Operational conditions of the detector for the ASDEX Upgrade plasma diagnostics are optimized using its capacitance measurements as a function of an applied bias as well as the numerical evaluations of the detector response; these are also directly verified by the synchrotron-radiation experiments. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1147913
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  • 3
    Digitale Medien
    Digitale Medien
    Crevicular fluid and serum IgG subclasses and corresponding mRNA expressing plasma cells in periodontitis lesions (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 32 (1997), S. 0 
    Details
    ISSN: 1600-0765
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Recent reports suggest that specific serum IgG subclasses are a feature of several forms of periodontitis. GCF antibodies are both serum-derived and locally produced by the abundant plasma cells of the diseased periodontal tissue. Previous work has shown that crevicular fluid (GCF) levels of IgG may be reduced in active and deep periodontal pockets when compared to other sites in chronic periodontitis patients (7). These findings, and more recent findings for IgA levels in GCF (5), suggest that GCF immunoglobulins may indicate “high risk“ sites for periodontitis. In these studies, the relative distribution of IgG isotypes was not investigated, nor was the relative contribution of local and serum antibodies to the GCF immunoglobulin profile. Therefore, more precise investigation of the tissue distribution of local gingival IgG subclass producing plasma cells and their protein levels in the GCF from the same sites and in serum, was undertaken.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-0765.1997.tb01401.x
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  • 4
    Digitale Medien
    Digitale Medien
    Accumulation and Depuration of Tributyltin Oxide and Its Effect on the Fertilization and Embryonic Development in the Pacific Oyster, Crassostrea gigas (1997)
    Springer
    Bulletin of environmental contamination and toxicology 58 (1997), S. 489 -496 
    Details
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001289900361
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  • 5
    Digitale Medien
    Digitale Medien
    Evolutionary Motif and Its Biological and Structural Significance (1997)
    Springer
    Journal of molecular evolution 44 (1997), S. S038 
    Details
    ISSN: 1432-1432
    Schlagwort(e): Key words: Evolutionary motif — Motif length — Multiple alignment — Window analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract. We developed a method for multiple alignment of protein sequences. The main feature of this method is that it takes the evolutionary relationships of the proteins in question into account repeatedly for execution, until the relationships and alignment results are in agreement. We then applied this method to the data of the international DNA sequence databases, which are the most comprehensive and updated DNA databases in the world, in order to estimate the ``evolutionary motif'' by extensive use of a supercomputer. Though a few problems needed to be solved, we could estimate the length of the motifs in the range of 20 to 200 amino acids, with about 60 the most frequent length. We then discussed their biological and structural significance. We believe that we are now in a position to analyze DNA and protein not only in vivo and in vitro but also in silico.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00000056
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  • 6
    Digitale Medien
    Digitale Medien
    Taurine prevents intracellular calcium overload during calcium paradox of cultured cardiomyocytes (1997)
    Springer
    Amino acids 13 (1997), S. 1-11 
    Details
    ISSN: 1438-2199
    Schlagwort(e): Amino acids ; Taurine ; Calcium paradox ; Cultured myocardial cell ; Intracellular free calcium ; Beating
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The effect of taurine on the cellular distribution of [Ca2+]i, during the calcium paradox was examined by digital imaging of a single fura-2-loaded cell. Cardiomyocytes superfused with control medium containing 2mM Ca2+ exhibited typical transients associated with spontaneous beating. When the cells were exposed to Ca2+-free buffer, immediate cessation of both spontaneous contractions and calcium transients was observed as [Ca2+]; rapidly fell to a level of 3–6 × 10−8M. Subsequent restoration of medium calcium increased [Ca2+]i to level 4–7 times normal. Large increases in [Ca2+]i were observed in most cells and were associated with the development of contracture and bleb formation. Taurine pretreatment (20mM) caused no significant effect on [Ca2+]i during Ca2+ depletion. However, it inhibited excessive accumulation of [Ca2+]i during the Ca2+ repletion. Moreover, taurine treated cells recovered their Ca2+-transients and beating pattern earlier than non-treated cells. Finally morphological abnormalities commonly associated with calcium overload were attenuated by taurine treatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01373044
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  • 7
    Digitale Medien
    Digitale Medien
    Asymmetry in the self-sustained oscillation ofPhysarum plasmodial strands (1997)
    Springer
    Protoplasma 197 (1997), S. 132-135 
    Details
    ISSN: 1615-6102
    Schlagwort(e): Asymmetric self-sustained oscillation ; Information processing ; Physarum polycephalum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The characteristics of the self-sustained oscillation in the plasmodial strand ofPhysarum polycephalum have been investigated in one steady and two transient conditions. An isolatedPhysarum strand changes its length periodically when it is suspended. In the behaviour of the self-sustained oscillation under the conditions, we provide the first demonstration that the changes in the periods of the oscillation can be ascribed to effects on the shortening phase, while the lengthening periods are almost unaffected. This result means that the asymmetric self-sustained oscillation of thePhysarum strand is composed of an active contracting process, presumably due to actin filaments and myosin-like molecules in the strand, and a passive lengthening process which is merely an extension of the strand under a load.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01279891
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  • 8
    Digitale Medien
    Digitale Medien
    Adriamycin (ADM) induced apoptosis in Transitional Cell Cancer (TCC) cell lines accompanied by p21 WAF1/CIP1 induction (1997)
    Springer
    Apoptosis 2 (1997), S. 207-213 
    Details
    ISSN: 1573-675X
    Schlagwort(e): Adriamycin (ADM) ; apoptosis ; Bax ; Bcl-2 ; p21WAF1/CIP1 ; p53 ; Transitional Cell Cancer (TCC)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Genotoxic stimuli, including anticancer drugs, induce apoptosis in cancer cells through increase of p53, p21WAF1/CIP1 , at least in part. Bcl-2 and Bax modify this pathway or directly regulated by p53. Here we studied Adriamycin (ADM)-induced apoptosis in four human bladder cancer cell lines in respect of p53, p21WAF1/CIP1 and Bcl-2 family proteins. After ADM, treatment bladder cancer cells underwent dose-dependent cell death with typical morphologic features of apoptosis. Among four cell lines RT4 with wt p53, low ratio of Bcl-2 to Bax and induction of p21WAF1/CIP1 after ADM treatment, was the most sensitive to induction of apoptosis. Thus, p53, p21WAF1/CIP1 , Bcl-2 and Bax status might determine susceptibility of bladder cancer cells to ADM induced apoptosis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026472700554
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  • 9
    Digitale Medien
    Digitale Medien
    Prevalence of urinary tract infection during outpatient follow-up after renal transplantation (1997)
    Springer
    Infection 25 (1997), S. 101-105 
    Details
    ISSN: 1439-0973
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Seven hundred and twenty-seven renal transplant patients are reviewed with respect to the occurrence of urinary tract infection (UTI) after renal transplantation. UTI was defined as the detection of both bacteriuria (105 CFU/ml) and pyuria (10 leukocytes/hpf). UTI developed in 11 of the inpatients (20.8%) and in 30 (4.2%) of the outpatients during a one-year period. Among outpatients, 12 had symptomatic infections, comprising seven with acute pyelonephritis and five with acute cystitis. Asymptomatic UTI was detected in 18 patients. In addition, asymptomatic bacteriuria without pyuria was observed in ten (1.4%) patients. UTI was more common in patients with diabetes, and underlying urinary tract complications were present in some patients. Administration of trimethoprim-sulfamethoxazole for about 4 months is suggested to reduce the frequency of UTI in the early period after renal transplantation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02113586
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  • 10
    Digitale Medien
    Digitale Medien
    Imaging blend morphology of unstained styrene-N-phenyl-male- imide--styrene-co-acrylonitrile using electron microscopy (1997)
    Springer
    Journal of materials science 16 (1997), S. 528-530 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Abstracts are not published in this journal
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1018597201270
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