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  • 1
    Electronic Resource
    Electronic Resource
    Epitaxial Fe (001) micro tiling: Size and interaction effects (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3091-3093 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of 200 Å epitaxial Fe (001)/MgO (001) tiling are studied as a function of tile size and separation. For edge sizes above ∼3 μm, the individual tiles maintain the single domain behavior while below ∼3 μm the tiles break into domains due to demagnetizing effects. In addition, below an inter tile separation threshold of about 0.9 μm, a single tile magnetization switch provokes a reversal cascade in all the tiles; while, above this threshold, the individual tile's magnetization switches independently. In this last case, we have experimental access to the distribution of nucleation sites. Thus, we have found a clear signature of the magnetic interaction between patterned epitaxial micro tiles with in-plane magnetization. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126533
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  • 2
    Electronic Resource
    Electronic Resource
    Anisotropy measurements in mesoscopic magnets by magneto-optical torque (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2039-2041 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The development of a versatile tool to quantify magnetic anisotropies in continuous and patterned magnetic thin films is reported. The technique involves measuring the magnetooptic response to a rotating magnetic field. Similarly to mechanical torque techniques, a single measurement obtains both the anisotropy constants and their symmetry axes distribution. The technique has been applied to analyze arrays of submicrometer stripe-shaped Fe (001) elements with different interelement separations (s). For s larger than 1 μm, the anisotropy associated with the stripes is independent on separation, with a value of the effective uniaxial anisotropy constant very consistent with theoretical estimations for these systems. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310212
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  • 3
    Electronic Resource
    Electronic Resource
    Co-transfer of two plasmids determining bacteriocin production and sucrose utilization in Streptococcus faecium (1984)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 23 (1984), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Streptococcus faecium strain 25 produced a bacteriocin (enterococcin Sf25), metabolized sucrose and contained three plasmids of 2.4, 4.7 and 13.0 MDa. Plasmids Sfp2.4 and Sfp4.7 were cotransferred in a filter mating procedure to sucrose negative and bacteriocin negative S. faecium strain M16. Strain M16 harboured a nonselftransferable plasmid Sfp 19.1 MDa, which was responsible for erythromycin resistance. Transcipient cells of S. faecium M16 contained the 19.1-MDa plasmid and plasmids Sfp2.4 and Sfp4.7, produced the enterococcin Sf25 and gained the ability to degrade sucrose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1984.tb01051.x
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  • 4
    Electronic Resource
    Electronic Resource
    Transfer of a miniplasmid determining bacteriocin production and bacteriocin immunity in Streptococcus faecium (1983)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 20 (1983), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Streptococcus faecium strain 3 produced a bacteriocin (enterococcin Sf3) and contained a homogeneous species of plasmid DNA (pJK3) with an Mr of 3.5 · 106. Plasmid pJK3 was transferable in a filter mating procedure to S. faecium M16. The non-bacteriocinogenic strain M16 was susceptible to enterococcin Sf3 and harboured a non-selftransferable 19.1 MDa plasmid, which was responsible for erythromycin resistance. Transcipient cells of S. faecium M16 contained the 19.1 MDa and the pJK3 plasmid, produced the enterococcin Sf3 and were resistant against the inhibitory action of this bacteriocin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1983.tb00153.x
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  • 5
    Electronic Resource
    Electronic Resource
    Detection of plasmids in alpha toxin-producing and non-producing strains of Clostridium novyi type A (1981)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 11 (1981), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1981.tb06987.x
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  • 6
    Electronic Resource
    Electronic Resource
    Beitrag zur Kenntnis der juvenilen monartikulären rheumatoiden Arthritis (1972)
    Springer
    Virchows Archiv 357 (1972), S. 359-368 
    Details
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei zwei Mädchen im Alter von 2 und 11 Jahren wurde eine monartikuläre Arthritis beobachtet, die wegen ihres protrahierten Verlaufes und einiger serologischer Hinweise die Diagnose einer rheumatoiden Arthritis nahelegte. Die Gelenkbeschwerden bis zur Ergußbildung blieben bei beiden Kindern auf ein Gelenk beschränkt. Chronisch-rezidivierende Ergüsse machten eine Synovektomie notwendig. Vergleichende licht-, transmissions- und rasterelektronenmikroskopische Untersuchungen des gesamten Synovektomiematerials bestätigten die klinische Verdachtsdiagnose einer rheumatoiden Arthritis. Morphologisch ist bei monartikulärer Manifestation die rheumatoide Synovitis gekennzeichnet durch: Eine ausgeprägte Hyperplasie der gelenkauskleidenden Zellen, eine Polymorphie dieser Zellen bis zur Ausbildung von Riesenzellen, eine absolute Vermehrung der intercellulären Grundsubstanz, ein Überwiegen der ergastoplasmareichen B-Zellen und herdförmige leukocytenreiche perivasale Zellinfiltrate sowie gleichmäßige Präcipitationen von Fibrin an der Oberfläche der Synovialmembran.
    Notes: Summary In 2 girls, aged 2 and 11 years, a diagnosis of juvenile rheumatoid arthritis was suggested by clinical and serological examinations. Joint symptoms including effusion were limited to one joint in each case. Recurrence of joint effusion necessitated synovectomy in both children. Comparative light, transmission and scanning electron microscopic studies performed on the complete synovectomy specimens confirmed the diagnosis of rheumatoid arthritis. In these cases of monarticular rheumatoid arthritis the hallmarks were: Hyperplasia of the synovial lining, cell polymorphism with occasional giant cells, an absolute increase of intercellular matrix, predominance of B-cells rich in ergastoplasm, focal perivascular leucocytic infiltrates and homogeneous precipitations of fibrin on the synovial surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00548784
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  • 7
    Electronic Resource
    Electronic Resource
    Changes and measurement of height and angle in the lumbosacral region (1984)
    Springer
    Archives of orthopaedic and trauma surgery 103 (1984), S. 112-114 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Aus den Parallelen zur Bodenplatte L4 und Deckplatte S1 läßt sich mit dem Lot in den Wirbeleckpunkten ein lumbosakrales Trapez konstruieren, das genaue Meßdaten für Höhen und Krümmungsänderungen der unteren lumbalen Bewegungssegmente liefert. Die klinisch bedeutsamen Höhenminderungen im dorsalen Abschnitt der Segmente L4/5 and L5/S1 mit Verstärkung der Lendenlordose sowie deren therapeutische Aufrichtung durch konservative bzw. operative Maßnahmen lassen sich damit genau aufzeichnen.
    Notes: Summary A lumbosacral trapezium can be constructed using the parallels to the lower plate L4 and the upper plate S1 and two perpendiculars to the former; it yields exact measurement data for changes in height and curvature in the lower lumbar motion segments. The clinically relevant reductions in height in the dorsal part of the segments L4-5 and L5-S1, the increase in lumbar lordosis, and therapeutic straightening by means of conservative or operative treatment can thus be plotted exactly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389582
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  • 8
    Electronic Resource
    Electronic Resource
    Lumbosacral distraction spondylodesis with autologous bone graft together with posterolateral fusion (1984)
    Springer
    Archives of orthopaedic and trauma surgery 103 (1984), S. 107-111 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Um neben der Fixation auch eine Dekompression im dorsalen Anteil der unteren beiden lumbalen Bewegungssegmente zu erreichen, ergänzen wir die posterolaterale Fusion durch eine mediale interspinale Distraktionsspondylodese. Ein genau vermessener kortikospongiöser Span aus der Spina iliaca posterior wird unter Distraktion bei maximaler Kyphosierung der LWS ohne alloplastisches Osteosynthesematerial zwischen die Dornfortsätze L4 und S1 geklemmt. Der Span soll die Distraktion bis zum Festwerden der posterolateralen Knochenstraßen aufrechthalten. Außerdem wird damit eine dritte Fusionsstrecke geschaffen. Indikation, Technik und postoperatives Vorgehen werden beschrieben. Distraktionsergebnis und -beständigkeit werden mit einem standardisierten Meßverfahren für die Bewegungssegmente L4 bis S1 überprüft.
    Notes: Summary We supplement posterolateral fusion with medial interspinal distraction spondylodesis to attain decompression in addition to fixation in the dorsal part of the two lower lumbar motion segments. An exactly fitted corticospongiosa bone graft from the spina iliaca posterior is wedged between the spinal processes L4 and S1 under distraction with maximal kyphosis of the lumbar spine; metallic implants are not used. The graft maintains the distraction until the posterolateral fusion band is fixed. Furthermore, a third fusion band is thus made. Indication, technique, and postoperative treatment are described. The outcome and durability of the distraction are checked with a standardized measurement procedure for motion segments L4 to S1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389581
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  • 9
    Electronic Resource
    Electronic Resource
    Control of urease formation in certain aerobic bacteria (1972)
    Springer
    Archives of microbiology 81 (1972), S. 178-196 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary During nitrogen starvation, a 20- to 250-fold increase in specific urease activity was observed in extracts of P. aeruginosa, P. fluorescens, Hydrogenomonas, M. denitrificans, M. cerificans and B. megaterium. In contrast to these species, high levels of urease were observed in P. vulgaris strains and in S. ureae under all growth conditions. No urease was detectable in strains of E. coli, S. marcescens and B. polymyxa, regardless of growth conditions. Incubated in the absence of an exogenous nitrogen source, the specific urease activity increased during a period of 10 to 20 h in P. aeruginosa, Hydrogenomonas and M. denitrificans. Phosphate starvation did not significantly effect urease formation in these strains. The increase in specific urease activity was found to be repressed by exogenous nitrogen sources, including urea. Inhibition by chloramphenicol, other inhibitors, and by the lack of oxygen or fructose, indicated that a derepressive urease formation may occur in these strains. The involvement of traces of urea possibly released from endogenous sources during starvation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00412327
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Vermeidung von Wundinfektionen in der operativen Orthopädie (1974)
    Springer
    Archives of orthopaedic and trauma surgery 80 (1974), S. 79-86 
    Details
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Selbst wenn keine sogenannte Sterilbox zur Verfügung steht, ist es möglich, die Infektionsrate bei orthopädischen Operationen niedrig zu halten. Maßgebend ist die Beachtung allgemeiner Grundsätze der Asepsis, Antisepsis und der antibakteriellen Chemotherapie. Bactericide, atoxische knochengängige Breitbandantibiotica werden entsprechend der jeweiligen Erreger- und Resistenzsituation an einer Klinik nur bei besonders infektionsgefährdeten Operationen eingesetzt. In den Jahren 1971 bis 1973 wurden in der Orthopädischen Universitätsklinik Düsseldorf 1459 aseptische orthopädische Operationen durchgeführt. Im gleichen Zeitraum traten 12 (0,8%) postoperative Wundheilungsstörungen auf.
    Notes: Summary Even if there is no sterile operation box, it is possible to keep the incidence of infections in orthopedic surgery low. It is important to observe the well known principles of asepsis, antisepsis and antibacterial chemotherapy. In operations involving patients especially disposed to infection, it is necessary to apply bactericidal and nontoxic antibiotics maintaining a high bone concentration and include the actual tested bacterial spectrum of the clinic. From 1971–1973 1459 aseptic orthopedic operations were performed in the Orthopädische Universitätsklinik Düsseldorf. Of these operations postoperative wound infections developed in 12 cases (0.8%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00416544
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