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  • 1
    Digitale Medien
    Digitale Medien
    Use of agricultural wastes for xanthan production by Xanthomonas campestris (1998)
    Springer
    Journal of industrial microbiology and biotechnology 21 (1998), S. 242-246 
    Details
    ISSN: 1476-5535
    Schlagwort(e): Keywords: xanthan; agricultural wastes; Xanthomonas campestris
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Four different acid-hydrolyzed wastes, from melon, watermelon, cucumber and tomato were compared for xanthan production. Growth of Xanthomonas campestris, xanthan biosynthesis, kinetics and chemical composition were investigated. Both growth and xanthan production were dependent on the acid hydrolysate concentrations and available nitrogen. Melon acid hydrolyzed waste was the best substrate for xanthan production. Exopolysaccharide obtained throughout this study was compared to commercial xanthan, showing a very similar chemical composition. Acid hydrolyzed wastes are proposed as a new carbon source for xanthan production.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/sj.jim.2900582
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Contribution to radiative corrections from decoupling particles (1992)
    Springer
    The European physical journal 55 (1992), S. 175-177 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Particles which normally decouple in the large mass limit (i.e., unrelated to the symmetry breaking) may contribute to radiative corrections if their mass ism new∼M W . We study their effect on various observables.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01558303
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  • 3
    Digitale Medien
    Digitale Medien
    Pre-Breakdown Processes in the Hollow Cathode Region of a Transient Hollow Cathode Discharge (1997)
    Springer
    Astrophysics and space science 256 (1997), S. 337-342 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Discharge formation in the A–K space of transient hollow cathode discharge (THCD) is causally linked with the emission of high energy electron beams originating in the hollow cathode region (HCR). Ionization in the A–K gap proceeds through the formation of a moving virtual anode, whose time evolution is strongly correlated with different periods in the electron beam activity. Here, we report on time and space resolved observations of different ionization events inside the HCR, which are time correlated with ionization processes inside the A–K gap. The experiments have been performed in Hydrogen, at pressures between 50 and 400 mTorr. A statistical study of the characteristic times associated with the different ionization events, based on von Laue plots, shows that the time distribution of events is well described by a single Gaussian distribution.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1001184301884
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  • 4
    Digitale Medien
    Digitale Medien
    Time Resolved Studies of a Pulsed Hollow Cathode Capillary Discharge (1997)
    Springer
    Astrophysics and space science 256 (1997), S. 479-484 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Experimental studies on a fast pulsed capillary discharge are presented. The discharge operates in a 0.8 mm inner diameter capillary, at 12 kV applied voltage. On axis discharge initiation is achieved by means of the hollow cathode effect. A short, less than 10 ns, XUV pulse is produced. Preliminary time resolved spectroscopic studies indicate that a hot, fast evolving short duration capillary plasma is produced.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1001113208244
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    After-potentials due to an electrogenic pump in molluscan giant neurons (1969)
    Springer
    Cellular and molecular life sciences 25 (1969), S. 826-828 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Resumen En un grupo de neuronas centrales de caracol, cada potencial de actión es seguido invariablemente por una onda hiperpolarizante. Esta onda no es debida a un aumento de permeabilidad de la membrana; aumenta en duración y voltage a medida que se aumenta el nÚmero de potenciales de action que la producen y es eliminada reversiblemente por inhibidores metabólicos. Se la interpreta como producida por una bomba electrogénica que extruye las cargas que penetraron al soma neuronal durante el potencial de acción.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01897900
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  • 6
    Digitale Medien
    Digitale Medien
    X-ray lasers as sources for resonance-fluorescence experiments (1994)
    Springer
    Applied physics 58 (1994), S. 7-11 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55.Vc ; 32.30.Rj ; 52.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We point out that existing Ne-like X-ray lasers have sufficient brightness to be used as pump sources in resonant pump-fluorescence experiments, and we discuss some of the potential benefits and limitations of such experiments. In preliminary experiments, we have measured the line overlap of the Ne-like yttrium X-ray laser near 155 Å with 4f−3d transitions in H-like Na and He-like Mg. These experiments used a high-resolution grating spectrometer, and calibrated the wavelength of the yttrium laser by comparison against lines of known wavelength. The results indicate that the wavelength of the yttrium laser is 154.985 ± 0.025 Å, a factor of 2–4 improvement in precision over previous calibrations. We find that the yttrium laser is ≈ 100 mÅ to the long-wavelength side of both the He-like Mg line and the H-like Na line, so that neither resonance is perfect; however, Stark broadening could improve the overlap in the latter scheme, and bulk Doppler shifting could improve both resonances. We also find a good resonance between the yttrium laser and an un-identified transition which we tentatively attribute to copper.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081706
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    First observation of lasing at 231 Å in neon-like nickel using the prepulse technique (1993)
    Springer
    Applied physics 57 (1993), S. 309-311 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60.By ; 32.30.Rj
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report lasing for the first time in nickel on the neon-like J=0→1, 3p→3s transition at 231 Å as well as several weaker transitions including the J=2»1 lines at 298 Å and 304 Å. Amplification is seen only when the prepulse technique of using a low intensity prepulse before the main optical drive pulse is used to illuminate the nickel target. The prepulse technique is also shown to produce lasing in copper and dramatically improve the output of the germanium laser.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00332454
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  • 8
    Digitale Medien
    Digitale Medien
    Investigation of gain and hyperfine splitting in the niobium X-ray laser (1994)
    Springer
    Applied physics 58 (1994), S. 3-5 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 31.30.Gs ; 32.70.Jz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Neon-like niobium X-ray lasers have been studied using both slab and thin-foil target geometries. Niobium foils of various lengths were irradiated from both sides with two beams of the frequency-doubled Nova laser system using a line focus. We looked for gain by measuring spectrally integrated line intensities at different plasma lengths. Gain was observed in four neon-like niobium lines corresponding to 3s−3p transitions. The line profile of theJ = 0−1 line (λ = 145.9 Å) shows splitting due to the hyperfine effect. Improved contrast in the hyperfine structure is observed as the plasma length is increased. Hyperfine splitting may be relevant to other 3s−3p transitions in neon-like niobium as well as other neon-like X-ray laser systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081705
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  • 9
    Digitale Medien
    Digitale Medien
    Effect of inoculation with Azotobacter chroococcum on nitrogenase activity of Zea mays roots grown in agricultural soils under aseptic and non-sterile conditions (1988)
    Springer
    Biology and fertility of soils 6 (1988), S. 170-173 
    Details
    ISSN: 1432-0789
    Schlagwort(e): A. chroococcum ; Seed inoculation ; Zea mays ; Acetylene reduction assay ; Yield response ; Associative N2 fixation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Inoculated and non-inoculated seedlings of Zea mays were grown in agricultural soils under aseptic and non-sterile conditions. Acetylene reduction activity and microbial counts were determined after 7 and 30 days of growth. Irrespective of the soil type Azotobacter spp. were commonly isolated under maize cultivation. Inoculation of agricultural soils with a suspension of A. chroococcum led to an increase in Azotobacter numbers, although this effect diminished with time. Nitrogenase activity was detected on maize roots and increased in response to the inoculation with A. chroococcum, showing that this associative growth could be of primary importance for the plant. The results of assays for acetylene reduction activity indicated that the nitrogenase activity was associated only with the root systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00257669
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  • 10
    Digitale Medien
    Digitale Medien
    Grain yield response of Zea mays (hybrid AE 703) to Azotobacter chroococcum H23 (1988)
    Springer
    Biology and fertility of soils 6 (1988), S. 352-353 
    Details
    ISSN: 1432-0789
    Schlagwort(e): A. chroococcum ; Zea mays ; Yield response ; Fertilizer N ; Inoculation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary Field experiments were conducted during 1985 and 1986 to examine the effect of Azotobacter chroococcum on the grain yield of maize. Application of 40 kg N ha−1 plus A. chroococcum caused a significant increase in maize yield. Azotobacter inoculation was more efficient at lower doses (40 kg N ha−1) than at high doses (80 kg N ha−1) of urea.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00261026
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