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  • 11
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 13 (1986), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A biopsy taken from an annular eruption on the thigh of an infant boy showed features of Ofuji's eosinophilic pustular folliculitis, yet fungal hyphae were demonstrated in the lesion. This ease is reported to illustrate that tinea infection can simulate eosinophilic pustular folliculitis histologically.
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  • 12
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The consequences of the variational definition of the self-consistent potential in Brueckner-Hartree-Fock theory are explored to higher orders even summing up some classes of diagrams to infinity. The consistency of this definition with a diagrammatic expansion are checked. Overcounting terms in the variational approach are pointed out and their numerical influence on the ground state properties of nuclei is checked at the example of16O. Ambiguities of the potential defined by the variational procedure stemming from the property of the Pauli-operatorQ 2 =Q are studied diagrammatically and numerically. The application to16O shows that the influence of the Pauli rearrangement term is partially cancelled by the higher order starting energy rearrangement terms discussed in this work.
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  • 13
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ten nitrate reductase-deficient Hordeum vulgare mutants were characterized for NADH and FMNH2 nitrate reductase (NR), cytochrome C reductase (CR) and nitrite reductase (NiR) activities. The mutants sort into four major groups. Group I represented by mutants Az 12, Az 23, Az 29 and Az 30 have low Nr and Cr activities. Group II represented by mutants Az 13, Az 31, Az 33 and Az 34 have low NR activities but intermediate CR activities. Group III represented by mutant Az 28 has low NR activity, but above normal CR activity. Group IV represented by Az 32 has low NADH-NR, low CR, but above normal FMNH2-NR activity. All ten mutants have elevated NiR activities. None of the ten mutants were constitutive for nitrite reductase activity. Only Az 34 showed a definite high temperature sensitivity when the NADH nitrate reductase activity was compared in the 12 to 26° C range. The mutants Az 12, Az 13, Az 23, Az 28, Az 29, Az 30, Az 31, Az 32 and Az 33 are allelic and were assigned the locus designation nar1. Mutant Az 34 represents a different genetic locus designated nar2. The nar1 gene is codominant and the nar2 gene is recessive.
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  • 14
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ten nitrate reductase (NR)-deficient mutants have been characterized for their cross-reactivity against specific barley (Hordeum vulgare L.) nitrate reductase antibodies. The rabbit antibodies raised against the purified barley wild type (cv. Steptoe) enzyme quantitatively inactivate nitrate reductase in crude extracts. All nitrate-grown (induced) mutants show positive precipitin reaction against the antiserum by Ouchterlony double diffusion test and all have the ability to neutralize antisera in a NR protection assay. Under induced growth conditions, mutants Az 12, Az 23, Az 29 and Az 30 which have low NR associated catalytic activities also have the lowest level of antigenicity; mutants Az 13, Az 31, Az 33 and Az 34 have intermediate level of both NR associated catalytic activities and antigenicity, while mutants Az 28 and Az 32 have the highest level of both NR associated catalytic activities and antigenicity. Under noninduced growth conditions, all mutants except Az 12 contain detectable but very low levels of NR antigenicity. These results support the concept that these NR-deficient mutants with various levels of NR associated catalytic activities represent different mutation events at the loci coding the NR structural components.
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  • 15
    ISSN: 1617-4623
    Keywords: Key wordsXanthomonas campestris pv. citri ; Bacterio- phage cf ; Pilin ; pilA ; Infection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Host factors that are important for infection of Xanthomonas campestris pv. citri by the filamentous bacteriophage cf were investigated by transposon mutagenesis with Tn5tac1. A mutant, XT501, that was resistant to cf infection was recovered, showing that the gene inactivated by the transposon is required for infection by the phage but not for cf replication or assembly. A 1.7-kb SacI-ApaI DNA fragment from XT501 containing the bacterial DNA flanking one end of the transposon was cloned and shown to be required for cf infection. Nucleotide sequence analysis of the 1.7-kb fragment reveals the presence of an ORF that encodes a protein of 146 amino acids. This protein shows 42% identity to the type 4 prepilin encoded by the pilA genes of other bacteria. The pilA gene of X. campestris pv. citri is thus essential for infection by the bacteriophage cf.
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  • 16
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 13 (1986), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In the skin lesion of a patient with pemphigus vegetans, Charcot-Leyden crystals were observed in the eosinophilic abscess cavities of the epidermis. The finding is documented for the first time. In addition, some of the intraepidermal eosinophilic abscess cavities have been shown to be due to accumulation of eosinophils in dilated acrosyringia, but their formation from acantholysis and spongiosis can not be entirely excluded.
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  • 17
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A prototype surface ionization source coupled with a fixed-geometry extraction electrode system was commissioned on the Isotope Separator Accelerator (ISAC) ion source test stand at TRIUMF. The suitability of the ion source and extraction system for use in the ISAC facility was determined by a series of emittance measurements of the extracted beams. The test stand optics were successfully commissioned using the prototype ion source; emittance measurements of the mass-separated beams demonstrated that second- and third-order beam aberrations (introduced by the magnetic dipole mass separation) could be corrected by the use of multipole electrostatic optics elements. An upper limit of the root-mean-square-energy spread (2 eV) was deduced from the emittance measurements. Emittance measurements were performed at beam energies of 10–50 keV, as well as for ion masses ranging from Li+ to Rb+, to demonstrate the feasibility of the prototype for a variety of beam energies and masses. © 1998 American Institute of Physics.
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  • 18
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 6270-6290 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: As a function of the coupling constant, it is shown that the Schwinger–Dyson equation has many bifurcation solutions that branch off from the trivial solution. Three of these solutions are obtained explicitly, using the parameter imbedding method and the Liaponov–Schmidt method. Application of these methods to other nonlinear problems is discussed. © 1994 American Institute of Physics.
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  • 19
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 6693-6702 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The parameter imbedding method for the Fredholm equation converts it into an initial value problem in its parameter λ. The method is established for general operator equations of the form [I+fˆ(λ)]ψ=φ. It is particularly useful for studying spontaneous symmetry breaking problems such as contained in the nonlinear Schwinger–Dyson equation. © 1994 American Institute of Physics.
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  • 20
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Heterojunction bipolar transistors (HBTs) with bases composed of a single monolayer of dopant are found to have exponentially increasing current gain as the temperature is lowered, in contrast to the gains of homogeneously doped HBTs, which have little dependence on temperature. We present GaAs-AlGaAs HBTs with base doping as high as 3×1014 cm−2 with a room-temperature current gain of 14. The sheet resistance of such a layer is 270 Ω/square at room temperature, and the carriers are restricted to a 15 A(ring) layer, implying an extremely short base transit time. AT 77 K the gain increases to 220, while the base resistance decreases to 190 Ω/square. Therefore by operating this HBT at low temperature we have achieved for the first time high gain and low base resistance in a HBT with an infinitesimally thin base.
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