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  • 1
    Electronic Resource
    Electronic Resource
    Calculations of the direct electromagnetic enhancement in surface enhanced Raman scattering on random self-affine fractal metal surfaces (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 317-325 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We study the classical electromagnetic enhancement at the excitation wavelength related to surface enhanced Raman scattering (SERS) experimental configurations in the vicinity of random rough metal surfaces possessing self-affine scaling behavior. The scattered electromagnetic intensity is obtained by means of numerical calculations based on the rigorous integral equations formulation of the electromagnetic wave scattering, free from the limitations of electrostatic and/or dipolar approximations. From the enhancement of the scattered field intensity in the immediate vicinity of the surface, originated in the excitation of transversal-magnetic surface plasmon polaritons, the SERS electromagnetic mechanism on substrates of Ag, Au, and Cu is explored as a function of the surface fractal dimension, rms height, and excitation wavelength. It is found that fractality favors the occurrence of large electromagnetic enhancements, which in turn appear to be maximum at an optimum wavelength as a result of the compromise between roughness-induced light coupling into surface plasmons and absorptive losses. This optimum wavelength is shorter for Ag than for Au and Cu. Maximum local enhancements on the order of 103 are encountered for the three metals being considered. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475394
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  • 2
    Electronic Resource
    Electronic Resource
    Surface defect scattering of surface plasmon polaritons: Mirrors and light emitters (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3509-3511 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the near-field and the angular distribution of radiation resulting from the scattering of surface plasmon polaritons from a surface defect by means of numerical calculations based on the use of the impedance boundary condition. Maximum reflection (plasmon mirrors) is found for half widths on the order of the inverse of the surface plasmon wavevector, either protuberances or indentations, as predicted by a perturbation-theoretic argument. Maximum radiation (light emitters) occurs for wider protuberances, with coupling efficiencies beyond 80%. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122820
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  • 3
    Electronic Resource
    Electronic Resource
    Cloning Systems in Amino Acid–Producing Corynebacteria (1987)
    [s.l.] : Nature Publishing Company
    Nature biotechnology 5 (1987), S. 137-146 
    Details
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Members of the genera Corynebacterium and Brevibacterium are widely used in the production of amino acids and nucleotides, as well as in the bioconversion of steroids and in the cheese industry. In the last few years, cloning vectors have been developed in corynebacteria using replicons from ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nbt0287-137
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  • 4
    Electronic Resource
    Electronic Resource
    Construction of L-lysine-overproducing strains of Brevibacterium lactofermentum by targeted disruption of the hom and thrB genes (1996)
    Springer
    Applied microbiology and biotechnology 46 (1996), S. 554-558 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The mobilization of plasmids from gram-negative Escherichia coli to gram-positive Brevibacterium lactofermentum, mediated by P-type transfer functions, was used to construct disrupted mutants blocked specifically in the homoserine branch of the aspartate pathway. The mutant strain B. lactofermentum R31 showed an efficiency of conjugal transfer two to three orders of magnitude higher than that of the wild-type strain B.␣lactofermentum ATCC 13869. The hom- and thrB- disrupted mutants of B. lactofermentum ATCC 13869 were lysine overproducers. B. lactofermentum R31 mutants do not overproduce lysine because R31 is an alanine-overproducing strain and channels the pyruvate needed for lysine biosynthesis to the production of alanine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050860
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  • 5
    Electronic Resource
    Electronic Resource
    Radiative properties of pulsar magnetospheres (1994)
    Springer
    Space science reviews 68 (1994), S. 349-355 
    Details
    ISSN: 1572-9672
    Keywords: Pulsars ; radiation mechanisms ; coherent radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss recent results of radius to frequency mapping of pulsars. This method shows that for 43 pulsars the radio emission originates near the polar cap for millisecond pulsars and a few hundred km away for longer period pulsars. If the magnetospheres of these object contain dipolar magnetic fields, the corresponding magnetic field strength in the emission region is about 107 gauss, for all pulsars in the sample. We investigate possible physical reasons for the location of the radio emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00749163
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  • 6
    Electronic Resource
    Electronic Resource
    Identification, characterization, and chromosomal organization of the ftsZ gene from Brevibacterium lactofermentum (1998)
    Springer
    Molecular genetics and genomics 259 (1998), S. 97-104 
    Details
    ISSN: 1617-4623
    Keywords: Key wordsftsZ-dcw cluster ; Corynebacteria ; Cell division genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ftsZ gene was cloned from the chromosomal DNA of Brevibacterium lactofermentum by the polymerase chain reaction (PCR) using two oligonucleotides designed from two conserved regions found in most of the previously cloned and sequenced ftsZ genes from other microorganisms. ftsZ is a single-copy gene in corynebacteria and is located downstream from ftsQ and murC, indicating linkage between genes involved in peptidoglycan synthesis (mur genes) and genes involved in cell division (fts genes). The organisation of the cluster is similar to that in Streptomyces and different from those of Escherichia coli or Bacillus subtilis because ftsA is not located upstream of ftsZ. The gene was expressed in E. coli using the T7 expression system; the calculated molecular weight of the expressed protein was 50 kDa. Expression of the B. lactofermentum ftsZ gene in E. coli inhibited cell division and led to filamentation. The ftsZ gene of this organism does not complement ftsZ mutations or deletions in E. coli, when cloned on low or high-copy-number vectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380050793
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  • 7
    Electronic Resource
    Electronic Resource
    FIA titrations of sulphide, cysteine and thiol-containing drugs with chemiluminescent detection (1993)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 345 (1993), S. 723-726 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The determination of sulphide, cysteine and thiol-containing drugs by high-speed FIA titrations with chemiluminescent detection is described. Two different redox processes, the reduction of hypochlorite by sulphide or thiol-containing drugs and the oxidation of luminol by hypochlorite, were coupled in the same FIA assembly. Procedures were applied to the determination of cysteine, N-acetylcysteine, N-penicillamine, 2-mercaptopropionyl-glycine and thiouracil in pharmaceuticals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325843
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