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  • 1
    Electronic Resource
    Electronic Resource
    Super-radiant surface emission from a quasi-cavity hot electron light emitter (1999)
    Springer
    Optical and quantum electronics 31 (1999), S. 183-190 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The Hot Electron Light Emitting and Lasing in Semiconductor Heterostructure (HELLISH-1) device is a novel surface emitter which utilises hot carrier transport parallel to the layers of a Ga1−xAlxAs p-n junction incorporating a single GaAs quantum well on the n-side of the junction plane. Non-equilibrium electrons are injected into the quantum well via tunnelling from the n-layer. In order to preserve the charge neutrality in the depletion region, the junction undergoes a self-induced internal biasing. As a result the built-in potential on the p-side is reduced and hence the injection of non- equilibrium holes into the quantum well in the active region is enhanced. The work presented here shows that a distributed Bragg reflector grown below the active region of the HELLISH device increases the emitted light intensity by two orders of magnitude and reduces the emission line-width by about a factor of 3 in comparison with the original HELLISH-1 structure. Therefore, the device can be operated as an ultrabright emitter with higher spectral purity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006961123975
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  • 2
    Electronic Resource
    Electronic Resource
    Über die Erdbebenkatastrophe in Japan am 1. September 1923 (1924)
    Springer
    Naturwissenschaften 12 (1924), S. 975-980 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01452106
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  • 3
    Electronic Resource
    Electronic Resource
    Efficient difference-frequency mixing of diode lasers in lithium niobate channel waveguides (2000)
    Springer
    Applied physics 70 (2000), S. 777-782 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Wi; 42.79.Nv; 42.72.Ai
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Reported are design, fabrication recipes, and performance of channel waveguides for mid-infrared difference-frequency mixing of diode lasers. The waveguides were formed by annealed proton exchange in periodically poled lithium niobate, and included a mode filter, a taper, and a mixing channel. Two designs of the mode filter and taper were investigated, one involving periodic segmentation. Device efficiencies of 1.4 % W-1-4.0 % W-1 were achieved for difference-frequency generation in the 2.8–3.6 μm wavelength region using near-infrared diode lasers as pump sources. Up to 136 μW output power was obtained at 2.8 μm with 198 mW total launched power. Measured conversion efficiencies were typically four times lower than predicted. Departure of the taper behavior from adiabatic contributed to this discrepancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050008
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  • 4
    Electronic Resource
    Electronic Resource
    Beziehungen zwischen katabolischer Repression und Sporulation bei Bacillus subtilis (1976)
    Springer
    Archives of microbiology 109 (1976), S. 181-186 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Das Enzym Acetoin-Dehydrogenase wird von zahlreichen Kohlenstoffquellen katabolisch reprimiert. Die folgenden Bufunde weisen darauf hin, daß die Repression dieses Enzyms und die Inhibition der Sporulation durch den gleichen Mechanismus erfolgen. 1. Mutanten, isoliert nach ihrer Fähigkeit, Acetoin Dehydrogense trotz Anwesenheit von Glucose zu bilden, können auch in Glucose Medium in einer höheren Rate als der Wildtyp sporulieren. 2. Die Fähigkeit einer Kohlenstoffquelle, die Induktion der Acetoin-Dehydrogenase zu hemmen, ist ihrer sporulationsinhibierenden Wirkung proportional. 3. Phosphatlimitierung im Medium, was bekanntlich Sporulation fördert, hat eine der katabolischen Repression entgegengesetzte Wirkung.
    Notes: Abstract Acetoin dehydrogenase can be catabolite repressed by numerous sources of carbon. The following results point out that the catabolite repression of this enzyme and the inhibition of sporulation are mediated by the same mechanism: 1. Mutants, able to synthesize acetoin dehydrogenase in the presence of glucose, sporulate in glucose medium at a higher rate than the standard strain. 2. The catabolite repressing effect of a compound and its ability to inhibit sporulation are in a direct relation to each other. 3. The limitation of inorganic phosphate in the growth medium, which is known to favour sporulation, counteracts the catabolite repressing effect of glucose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00425133
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  • 5
    Electronic Resource
    Electronic Resource
    Ueber reinen Aether zur Narcotisirung (1896)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 35 (1896), S. 117-118 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415293
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Prüfung des ätherischen Wachholderbeeröles (1884)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 23 (1884), S. 272-272 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01360504
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  • 7
    Electronic Resource
    Electronic Resource
    Nachweis des Arseniks in Geweben, Tapeten etc. (1883)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 22 (1883), S. 474-478 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338191
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  • 8
    Electronic Resource
    Electronic Resource
    Über die Beziechungen der chemischen Inhaltsstoffe der Pflanzen zum phylogenetischen System (1915)
    Springer
    Molecular genetics and genomics 13 (1915), S. 297-297 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01792920
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  • 9
    Electronic Resource
    Electronic Resource
    UV-induced allevation of λ restriction in Escherichia coli K-12: Kinetics of induction and specificity of this SOS function (1982)
    Springer
    Molecular genetics and genomics 186 (1982), S. 111-117 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In UV-irradiated cells of Escherichia coli K-12 a partial release of the restriction of non-modified phage λ is observed when the cells are recA + lexA +. We show here that the induction of this restriction allevation (RA) also depends on the recBC enzyme and that the expression of RA requires protein synthesis. Maximum expression was reached within 60 to 90 min after irradiation. Experiments are presented which show that upon UV-irradiation a signal is created which triggers the development of RA when protein synthesis is allowed. This signal decayed with a half-life of only a few minutes in cells treated with chloramphenicol. The decay kinetics were similar in uvr + and uvrA mutants. RA appeared to be specific for EcoK insofar as no allevation of λ restriction by EcoRI, EcoRII and EcoP1 occurred. During maximum expression of RA no gross reduction of the activities of the recBC enzyme (exonuclease V) and the restriction endonuclease EcoK was observed and no new DNA modifying activity appeared in the cells. Since, in fully expressed cells, up to 75% of the infecting λ DNA was converted to acid-soluble material within 20 min after infection we suggest that only a small specific fraction of λ infections may undergo RA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422921
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  • 10
    Electronic Resource
    Electronic Resource
    Genetic control of damage-inducible restriction alleviation in Escherichia coli K12: an SOS function not repressed by lexA (1984)
    Springer
    Molecular genetics and genomics 197 (1984), S. 297-303 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The alleviation of K-specific DNA restriction after treatment of cells by UV or nalidixic acid has been studied in mutants with various alleles of recA and lexA and combinations of these alleles and with recB and recF mutations. The studies show that induction of restriction alleviation by UV or nalidixic acid is abolished in mutants in which the recA protein is defective (recA13, recA56), its protease activity is altered (recA430) or in which it cannot be efficiently activated (recA142). Thermoinduction of restriction alleviation was observed in tif mutant (recA441). In lexA amber mutants restriction alleviation is not constitutive but is still inducible. In a lexA3 mutant restriction alleviation is inducible by nalidixic acid provided that recA protein is overproduced as a result of a recA operator mutation. Induction by UV depends on the recF function and an unidentified function (Y) which is controlled by the lexA protein. The recBC enzyme is necessary for induction by UV or by nalidixic acid. Temperature shift experiments with a thermosensitive recB mutant indicate that the recBC enzyme functions in an early step during UV-induction. It is concluded that the damage-inducible function which alleviates restriction is similar to other damage inducible repair (SOS) functions in the dependence on activated recA protease for induction, but that it differs from these functions by the absence of a direct control through the lexA repressor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330977
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