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  • 42.55  (4)
  • Auxin  (3)
  • Methane  (3)
  • Springer  (10)
  • 2005-2009
  • 1985-1989
  • 1980-1984
  • 1975-1979  (10)
  • 1965-1969
  • 1978  (10)
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Schlagwörter
Verlag/Herausgeber
  • Springer  (10)
Erscheinungszeitraum
  • 2005-2009
  • 1985-1989
  • 1980-1984
  • 1975-1979  (10)
  • 1965-1969
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Stratospheric methane measurements and predictions (1978)
    Springer
    Pure and applied geophysics 117 (1978), S. 367-380 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Stratosphere ; Methane
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract A new determination of stratospheric methane from 22 km to 35 km altitude with implications on the abundance of this constituent at greater heights is presented. Previous measurements, some of which showed large discrepancies with currently admitted values, have been reinterpreted and brought into agreement. The results are in contradiction according to present theories with thein situ determined CH4 abundances at the upper edge of the stratosphere. Implications on the vertical transport coefficient used in one dimensional models are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00876623
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  • 2
    Digitale Medien
    Digitale Medien
    Quasi-cw laser action in K5Nd(MoO4)4 (1978)
    Springer
    Applied physics 17 (1978), S. 367-370 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.55 ; 78.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We report on room temperature quasi-cw laser action in K5Nd(MoO4)4 at a wavelength of 1.067 μm. The crystal was pumped with the 5140 Å line of an argon ion laser. Due to thermal effects actual cw lasing was not possible. Chopping the pump light with a low duty cycle of 1∶1000 leads to quasi-cw laser action and stable output power. We have determined the fundamental laser parameters: threshold pump powerA T=15 mW, slope efficiency η=22%, and internal lossesL=2.5%. In order to explain the measured relaxation oscillations, diffusion of the excited 4f-excitons is considered. According to a recently developed theory, a diffusion constant ofD=2×10−6cm2/s explains the observed results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886207
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  • 3
    Digitale Medien
    Digitale Medien
    Polarization properties of a single-mode gas laser in transverse magnetic fields (1978)
    Springer
    Applied physics 17 (1978), S. 257-267 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.55 ; 32.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The effect of transversally applied magnetic fields on the polarization behavior of a single-mode gas laser is theoretically investigated, stressing the importance of the additivity of respective contributions influencing the time evolution of polarization parameters. By adding a new element to the existing theory, namely the contribution of magnetic-field-free regions in the active medium, and by considering the relatively large effects that small cavity anisotropies can cause, several apparent discrepancies between experiments and existing theory are resolved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886954
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  • 4
    Digitale Medien
    Digitale Medien
    Instability of laser cw oscillation in the presence of a passive medium (1978)
    Springer
    Applied physics 15 (1978), S. 265-270 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract For a homogeneously broadened two-level ring laser model the stability of the cw laser oscillation in the presence of a passive medium is investigated. The passive material is treated similar to the active material, but without an external pumping mechanism. Stable and unstable regions are shown for various parameters. The stability region of the cw solution becomes extremly small for certain parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00896107
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  • 5
    Digitale Medien
    Digitale Medien
    Multiwatt optically pumped ammonia laser operation in the 12–13 μm (1978)
    Springer
    Applied physics 17 (1978), S. 317-320 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Design and operating caracteristics of high pulse repetition rate NH3 laser producing up to 20 W of average output power are described. The NH3 laser, operating in the 12–13 μm region was optically pumped with a high pulse repetition rate TEA CO2 laser. Dependences of the NH3 laser output on the pump energy, ammonia and buffer gas pressures and pulse repetition rate have been studied. The conversion efficiency of up to 16% has been received.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00886961
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  • 6
    Digitale Medien
    Digitale Medien
    Sources and sinks of atmospheric methane (1978)
    Springer
    Pure and applied geophysics 116 (1978), S. 452-464 
    Details
    ISSN: 1420-9136
    Schlagwort(e): Trace gases ; Atmosphere ; Sources and Sinks ; Methane
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract In 1972 average mixing ratio of methane in the troposphere was 1.41 ppm and 1.3 ppmv for the northern and southern hemisphere, respectively, which corresponds to a total amount of 4×1015 g of CH4 present in the atmosphere. Most is of recent biologic origin.14C analyses show that no more than 20 percent is released by fossil sources. The various ecosystems producing CH4 are discussed and the total annual production is estimated to lie between 5.5×1014 g/yr and 11×1014 g/yr. The corresponding turnover times for atmospheric CH4 range from 4 to 7 yrs. The destruction of CH4 takes place mainly in the troposphere, most probably through the reaction of CH4 + OH ↠ CH3 + H2O. About 10 percent of the CH4 is destroyed in the stratosphere. The CH4 cycle contributes on the order of 1 percent to the atmospheric carbon cycle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01636899
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  • 7
    Digitale Medien
    Digitale Medien
    Ethylene and adventitious root formation in hypocotyl segments of etiolated mung-bean (Vigna radiata (L.) Wilczek) seedlings (1978)
    Springer
    Planta 138 (1978), S. 193-197 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Auxin ; Ethylene ; Root formation ; Vigna
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Rooting responses and ethylene production by hypocotyl cuttings from etiolated mung-bean seedlings treated with the auxins α-naphthaleneacetic acid, γ-(indole-3)-n-butyric acid (IBA) and 2,4,5-trichloro-phenoxypropionic acid were determined. There was no relationship between the abilities of the auxins to induce root formation and their capacities for inducing ethylene production. Studies with mixtures of 3-indoleacetic acid, a poor stimulator of rooting but an effective inducer of ethylene production, and IBA, an effective rooting stimulator but a poor inducer of ethylene production, exposure of cuttings to ethylene or (2-chloroethyl) phosphonic acid (Ethephon), hypobaric storage (150 mb) of treated cuttings, and exposure of auxin-treated cuttings to 7% CO2 also indicated that ethylene is not directly involved in initiation of adventitious roots in this plant material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00386810
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  • 8
    Digitale Medien
    Digitale Medien
    Lead toxicity effects on indole-3-ylacetic acid-induced cell elongation (1978)
    Springer
    Planta 144 (1978), S. 79-84 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Auxin ; Cell elongation ; Lead ; Triticum
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract In vitro studies of IAA-induced cell elongation in Triticum aestivum have demonstrated that lead causes a large reduction in elongation. Inhibition of elongation can be reduced by increasing the concentration of IAA, or by the addition of calcium. The inhibitory effect appears to be linked with changes in the properties of the cell walls. Experiments are described which show that lead becomes bound strongly to certain chemical substances involved in cell wall architecture.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00385010
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  • 9
    Digitale Medien
    Digitale Medien
    The occurrence and identification of intracellular polyglucose storage granules inMethylococcus NCIB 11083 grown in chemostat culture on methane (1978)
    Springer
    Archives of microbiology 117 (1978), S. 41-48 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Methylococcus ; Methane ; Chemostat ; Ammonia limitation ; Intracellular polyglucose
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The accumulation of intracellular storage granules (0.03–0.5 μm) byMethylococcus NCIB 11083 when grown under conditions of ammonia limitation with methane as the sole source of carbon and energy was inversely proportional to the dilution rate. The isolated material was composed entirely of glucose residues and the infra-red spectrum exhibited characteristic absorption bands at 925 cm-1, 845 cm-1 and 745±4 cm-1, indicating the presence of α (1→4) glycosidic linkages. The polymer dissolved in hot water to give an opalescent solution that formed a violet iodine complex with an absorption maximum at 550 nm, identical to that observed with reference amylopectin. The percentage of the polysaccharide released as maltose by the action of β- and α-amylases was 55–64% and 80–90% respectively, values very similar to those obtained by the action of these enzymes on reference amylopectin and glycogen. Methylation analysis indicated that the average interior and exterior chain lengths of the polymer were 2.7 and 10.0 glucose units respectively and confirmed that theMethylococcus polyglucose is a branched polymer composed of units joined by 1→4 and 1→6 linkages. The number average molecular weight of the polymer is 2–4.5×105. The stored polymer was metabolised by the organism and its metabolism resulted in the synthesis of protein.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00689349
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  • 10
    Digitale Medien
    Digitale Medien
    Rapid auxin- and fusicoccin-enhanced Rb+ uptake and malate synthesis in Avena coleoptile sections (1978)
    Springer
    Planta 139 (1978), S. 35-41 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Auxin ; Avena ; Cell elongation ; Ion uptake ; Malate synthesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The short-term effects of auxin (indole-3-acetic acid) and fusicoccin (FC) on Rb+ uptake and malate accumulation in Avena sativa L. coleoptile sections have been investigated. FC stimulates 86Rb+ uptake within 1 min while auxin-enhanced uptake begins after a 15–20-min lag period. Auxin has little or no effect on 86Rb+ uptake at external pHs of 6.0 or less, but substantial auxin effects can be observed in the range of pH 6.5 to 7.5. Competition studies indicate that the uptake mechanism is specific for Rb+ and K+. After 3 h of auxin treatment the total amount of malate in the coleoptile sections is doubled compared to control sections. FC causes a doubling of malate levels within 60 min of treatment. Auxin-induced malate accumulation exhibits a sensitivity to inhibitors and pH which is similar to that observed for the H+-extrusion and Rb+-uptake responses. Both auxin- and FC-enhanced malate accumulation are stimulated by monovalent cations but this effect is not specific for K+.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00390807
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