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  • 1
    Digitale Medien
    Digitale Medien
    Breeding of a non-urea producing sake yeast with killer character using a kar1-1 mutant as a killer donor (2000)
    Springer
    Journal of industrial microbiology and biotechnology 24 (2000), S. 203-209 
    Details
    ISSN: 1476-5535
    Schlagwort(e): Keywords: non-urea producing sake yeast; killer character; kar1–1; rare mating; protoplast fusion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Arginase-deficient (car1/car1) sake yeasts can brew sake without urea, a main precursor of ethyl carbamate, which is a suspected carcinogen in various fermented beverages. For the use of car1/car1 yeasts in sake production, contamination by wild-type (CAR1/CAR1) yeasts is a major problem. To protect sake mash against such contamination, killer character was introduced into the car1/car1 sake yeast HL163 by rare mating and protoplast fusion, using a kar1–1 haploid harboring killer dsRNA plasmids as a killer donor. All killer yeasts obtained showed no arginase activity and the same DNA content per cell as strain HL163, and produced sake with ordinary quality and very low levels of urea. We also demonstrated that one of these killer yeasts could effectively eliminate contaminant cells of a CAR1/CAR1 yeast from sake mash. Journal of Industrial Microbiology & Biotechnology (2000) 24, 203–209.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/sj.jim.2900797
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  • 2
    Digitale Medien
    Digitale Medien
    A travelling-wave beam deflector cleave-coupled to a diode laser (1989)
    Springer
    Optical and quantum electronics 21 (1989), S. 227-231 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract A new technique for scanning a diode laser beam is introduced where the beam is deflected in a current-injection-type travelling-wave beam deflector integrated with a diode laser. The deflector, which is formed outside the laser cavity, is cleave-coupled to the cavity. An anti-reflection coating on the deflector output facet suppresses the light returning to the laser. As a result, very smooth deflection of the radiation peak with low background intensity is realized in this device, while retaining high efficiency and low threshold current.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02192003
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  • 3
    Digitale Medien
    Digitale Medien
    Beam scanning and switching characteristics of twin-striped lasers with a reduced stripe spacing (1985)
    Springer
    Optical and quantum electronics 17 (1985), S. 431-434 
    Details
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract The output-beam scanning and switching characteristics of lasers with separately controlled twin-stripe electrodes are reported. The spacing between the stripes is small (5μm from centre to centre) and the spacing region is either etched or ion-implanted for better current isolation. The implanted laser oscillates in the fundamental mode. The output beam of this laser can be scanned over a radiation angle range of 7° almost linearly with injection currents. The etched laser oscillates in the first-order mode. The output beam of this laser can be switched with a deflection angle as large as ±8°.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00619569
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  • 4
    Digitale Medien
    Digitale Medien
    Effects of saccharin and aliphatic alcohols on the electrocrystallization of nickel (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 227-232 
    Details
    ISSN: 1572-8838
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Abstract The effects of saccharin and three kinds of aliphatic alcohols (n-propyl alcohol, allyl alcohol, propargyl alcohol) on the surface morphology and crystal orientation of electrodeposited nickel from a Watts bath (1 M NiSO4 + 0.21 M NiCl2 + 0.51 M H3 BO3 have been studied by means of electrochemical methods, scanning electron microscopy, energy-dispersive X-ray analysis and measurements of X-ray diffraction patterns. Saccharin and three kinds of aliphatic alcohols were adsorbed on the electrode and inhibited the reduction of nickel ion. The inhibitory effect on the reduction of nickel ion increased in the order n-propyl alcohol, allyl alcohol and propargyl alcohol. Large granular electrodeposits were obtained from the Watts bath in the absence of organic additives. When saccharin was added, fine-grained crystals were observed and the surface roughness was relatively small. When aliphatic alcohols were added, the size of surface morphological features became smaller in the order n-propyl alcohol, allyl alcohol and propargyl alcohol. Fine-grained, compact and smooth nickel electrodeposits, which had a preferred orientation with a (111) plane parallel to the surface, were obtained from the Watts bath containing both saccharin and propargyl alcohol.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00242888
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  • 5
    Digitale Medien
    Digitale Medien
    States of surface hydrogen under reaction conditions of the Fischer-Tropsch synthesis (1990)
    Springer
    Catalysis letters 7 (1990), S. 15-25 
    Details
    ISSN: 1572-879X
    Schlagwort(e): Adsorbed hydrogen ; subsurface hydrogen ; FT synthesis ; metal surfaces ; ellipsometry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The reaction of hydrogen with Fe surfaces was observed by the ellipsometric method at 77 K to 500 ° C under H2 pressures of 10−3 Torr (0.1 Pa) to 500 Torr (7×104 Pa). The ellipsometric analysis reveals no existence of adsorbed hydrogen on the surface above 400 °C; hydrogen seems to be alternatively absorbed into the subsurface region of two to three atomic layers. It is concluded that the subsurface hydrogen is specific to the high temperature and the high pressure owing to strained and roughened Fe surfaces as well as the equilibrium with gas phase hydrogen. Absence of adsorbed hydrogen is indicated as well in the ellipsometric response to the hydrogenation reaction of surface carbon species on Fe surfaces.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00764489
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  • 6
    Digitale Medien
    Digitale Medien
    Effects of preparation method of CeOx-Al2O3 on the thermostability and activity of the monolith supported Pt-Rh catalysts for automotive exhaust control (1995)
    Springer
    Catalysis letters 33 (1995), S. 229-235 
    Details
    ISSN: 1572-879X
    Schlagwort(e): support ; cerium ; alumina ; sol-gel ; thermostability ; platinum ; three-way catalyst
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Various CeOx-Al2O3 powders were prepared and the influence of the method of support preparation on the thermostability of the mixed alumina-supported Pt catalysts and on their oxidation of CO was investigated. It was found that the complexing agent-assisted sol-gel method is effective in improving the thermostability of the mixed alumina-supported Pt catalysts. Monolith Pt-Rh three-way catalysts were prepared using these aluminas and other thermostable alumina including Ba. Activity of the catalysts was also investigated after conducting accelerated thermal engine aging in order to test their durability. Under normal operating conditions of the automobile engine, the activity of the Pt-Rh three-way catalyst using the CeOx-Al2O3 support prepared by the complexing agent-assisted sol-gel method is nearly equal to that of the catalyst using the CeOx impregnated onto BaO-Al2O3 powder prepared by the same sol-gel method.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00814227
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  • 7
    Digitale Medien
    Digitale Medien
    Nonlinear processes in UV optical materials at 248 nm (1990)
    Springer
    Applied physics 50 (1990), S. 55-59 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55.Gp ; 42.55.Rz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Nonlinear processes in UV optical materials were investigated by using 280-fs, 248-nm pulses. Nonlinear absorption in CaF2 was confirmed to be a two-photon process by using the luminescence of self-trapped excitons, which was also used for the single shot pulse width measurement. The absorption bands due to F centers were identified in CaF2, MgF2, and LiF after several hundred shots at 100 GW/cm2. Absorption at 248 nm was considerable especially in MgF2 and LiF. Self-focusing and self-phase modulation were observed in CaF2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00330094
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  • 8
    Digitale Medien
    Digitale Medien
    Single picosecond UV pulse generation by mode-locking of an excimer laser-pumped dye laser (1986)
    Springer
    Applied physics 41 (1986), S. 49-52 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55.Mv ; 42.55.Hq ; 42.60.By
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A single picosecond ultraviolet pulse has been generated based on mode-locking of a dye laser pumped by a long pulse XeCl laser to serve as the input source for a high-power ps KrF laser system. A short-pulse uv dye laser (BBQ) pumped by an additional XeCl laser was used to selectively amplify a single pulse from a mode-locked pulse train with the pulse separation of 3.2 ns. The amplified single pulse was frequency-doubled to 248 nm with the pulse duration of 20 ps.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697527
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  • 9
    Digitale Medien
    Digitale Medien
    Laser cooling of a small number of Be+ ions in a penning trap (1993)
    Springer
    Applied physics 57 (1993), S. 141-144 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32.80.Pj ; 05.70.Fh ; 34.40.+n
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Be+ ions stored in a Penning trap were cooled by a laser beam perpendicular to the magnetic field. The cooled ions are strongly coupled and phase transitions of up to 100 ions were observed. In experiments with only a few ions stored in the trap, a stepwise decrease in fluorescence intensity was observed. All steps are of the same size and so every step is attributed to a single ion. The discrete changes in fluorescence occurred more frequently when the background pressure was increased, caused by collisions between stored ions and background neutral molecules.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00425998
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  • 10
    Digitale Medien
    Digitale Medien
    Observation of laser-cooled Be+ -ion clouds in a Penning trap (1995)
    Springer
    Applied physics 61 (1995), S. 285-289 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32.80.Pj ; 05.70.Fh
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Be+ ions trapped in a Penning trap are laser-cooled to about 10 mK. The excitation spectra of ion clouds containing about 500 ions are obtained by scanning the frequency of the cooling laser and discontinuities in these spectra are observed because of phase transitions. When the cooled ions are heated electrically by applying an rf voltage, no phase transition occurs and the spectra become continuous. Two-dimensional measurement of the ion clouds is carried out and the abrupt change in the shape of the ion cloud due to the phase transition is observed. When many ions are trapped and cooled, the phase transition occurs partially and a transient state where two states are mixed can be observed. The static properties of the ions are also measured by using an additional probe laser and the results of experimental measurements are compared with theoretical predictions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01082048
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