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  • 1990-1994  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Urinary bladder carcinoma with a neoplastic squamous component: a mapping study of 31 cases (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 21 (1992), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A mapping study of cystectomy specimens in three cases of pure squamous cell carcinoma and 28 cases with transitional cell carcinoma with squamous differentiation is described, with an emphasis on the histogenesis of pure squamous cell carcinoma. Two of the three cases of pure squamous cell carcinoma had extensive benign keratinizing mucosa and an atypical squamous metaplastic mucosa contiguous with the tumour. These pure squamous cell carcinomas seemed to be derived from the squamous metaplasia. On the other hand, in all except one of the cases of transitional cell carcinoma with squamous differentiation, there was neither benign keratinizing nor atypical squamous metaplastic mucosa in the bladder.The quantitative amounts of both the transitional cell and squamous components differed from case to case in 28 cases with transitional cell carcinoma with squamous differentiation. Five of the 28 had a tumour composed predominantly of a squamous component with minute transitional cell components at the margin. In another two cases, transitional carcinoma in situ or satellite tumours of transitional cells were present adjacent to the main tumour which was composed of squamous cell carcinoma alone. We think these seven tumours originated as a result of extensive squamous differentiation in the transitional cell carcinomas. These features may indicate two forms of histogenesis of pure squamous cell carcinoma. The first is malignant transformation on the basis of squamous metaplasia of the bladder mucosa and the second is extensive squamous differentiation in a pre-existing transitional cell carcinoma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.1992.tb00361.x
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  • 2
    Electronic Resource
    Electronic Resource
    Electrical properties of heavily Si-doped (311)A GaAs grown by molecular beam epitaxy (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1171-1173 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have systematically studied the electrical properties of heavily Si-doped GaAs grown on the (311)A GaAs surfaces by molecular beam epitaxy. It is found that the conduction type drastically changes from p type to n type with decreasing growth temperature at a critical temperature of ∼430 °C for uniform doping and ∼480 °C for the δ-doping case, with the transition temperature width as narrow as ∼50 °C for both cases. The highest hole density obtained for uniformly doped layers was 1.5×1020 cm−3, while for δ-doped layers a sheet hole density as high as 2.6×1013 cm−2 was achieved, which is the highest sheet hole density ever reported for δ-doped p-type GaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112136
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Unusual splice sites in the E1A–E1B cotranscripts synthesized in adenovirus type 40-infected A549 cells (1994)
    Springer
    Archives of virology 139 (1994), S. 389-402 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The adenovirus E1 DNA region consists of two transcription units, E1A and E1B. In this paper we report that the E1A–E1B cotranscripts containing sequences of both the E1A and E1B regions are synthesized during adenovirus type 40 (Ad40) infection of A549 cells. Cytoplasmic RNA was isolated from Ad40-infected A549 cells at 24, 72, and 100h post infection (p.i.). The complementary (c) DNA was synthesized by reverse transcription using an oligo-dT primer and then amplified by the polymerase chain reaction (PCR) using primers derived from the E1A and E1B regions. The cDNAs thus amplified were sequenced either directly or after cloning into bacteriophage M13 vectors. Analysis of cDNA indicated that the E1A–E1B cotranscripts are synthesized at 72h p.i., but not at 24 or 100h p.i. Nucleotide sequences of three cDNAs of the E1A–E1B cotranscripts indicated that the cotranscripts originate from the E1A promoter and lack sequences for both the E1A poly(A) site and E1B cap site. The splices create open reading frames for E1A–E1B fused polypeptides around the E1A–E1B junctions in these mRNAs. Most interestingly, the sequence analysis showed that the 5′ and 3′ splice junctions in the two E1A–E1B cotranscripts do not conform to the splice consensus GT-AG rule. Our results thus suggest that factor(s) which lead to unsual splicing in the E1 mRNAs are present in Ad40-infected A549 cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01310800
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Increased renal scarring by bacteria with mannose-sensitive pili (1990)
    Springer
    Urological research 18 (1990), S. 299-303 
    Details
    ISSN: 1434-0879
    Keywords: MS pili ; Serratia marcescens ; Renal scarring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Renal scars are thought to be the end stage of chronic pyelonephritis and one of the most important causes of renal insufficiency and renal hypertension. The role of bacterial pili was examined in scar formation after an infection of newly constructed bacterial strains using the recombinant DNA technique, which possessed either mannose resistant (MR) or mannose sensitive (MS) pili of Serratia marcescens. Strains that differed in only a single virulence factor, namely, MR or MS pili, were used in a rat model of chronic pyelonephritis. In this model, MS-piliated bacteria stimulated renal scarring more severely than non-piliated or MR-piliated bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300774
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental bacterial prostatitis in rats (1991)
    Springer
    Urological research 19 (1991), S. 141-144 
    Details
    ISSN: 1434-0879
    Keywords: Experimental ; Bacterial ; Prostatitis ; Rat ; Antibiotics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Experimental acute bacterial prostatitis in rats was induced by four different routes of bacterial inoculation. The most simple and reproducible method of producing bacterial prostatitis was to instil the bacterial suspension into the prostatic urethra after the administration of an appropriate antibiotic to prevent associated pyelonephritis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00368193
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Search for spontaneous π−- emission from a252Cf source (1992)
    Springer
    The European physical journal 342 (1992), S. 483-485 
    Details
    ISSN: 1434-601X
    Keywords: 25.85.Ca ; 27.90.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High energynp-pairs from a252Cf source were searched for. They are expected to be emitted with the absorption of negative pions which can be created through spontaneous fissions. The branching ratio is deduced as γπ/γSF 1.3×10−8 at the confidence level of 90%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294959
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic properties of proximity-induced superconducting matrix in multifilamentary wires (1994)
    Springer
    Journal of low temperature physics 94 (1994), S. 219-237 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Critical current densities Jcp of proximity-induced superconducting matrices in NbTi multifilamentary wires are estimated from measured twist-pitch dependence of magnetization. The values of Jcp are 2–4 orders of magnitude smaller than those of the superconducting filaments and decrease rapidly by raising temperature T and magnetic field Be. The interfilamentary spacing dN of submicrons results in zero screening length at measured temperatures ranging 4.5 to 8 K and the induced superconductivity is suggested to be type-II. The upper critical field Bc2p is obtained by applying the scaling law to Jcp data. Bc2p's at 4.5 K are 1.2–3.0 T for dN = 0.20–0.59 μm. The Cooper pair penetration length K N −1 estimated from the temperature dependence of Bc2p shows the clean limit characteristic as T−1 and 0.32 μm for dN = 0.59 μm wire at 4.5 K. K N −1 estimated from the temperature dependence of Jcp agrees consistently with those from Bc2p(T).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00755425
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    Paper (German National Licenses)
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