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  • 2015-2019  (8)
  • 1990-1994  (58)
  • 1985-1989  (53)
  • 1935-1939  (14)
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  • 1
    Digitale Medien
    Digitale Medien
    Second dissociation constant and pH of N-(2-hydroxyethyl)piperazine-N'-2-ethanesulfonic acid from 0 to 50.degree. C (1989)
    s.l. : American Chemical Society
    Analytical chemistry 61 (1989), S. 1400-1405 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00188a017
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Calculations on the rate of the ion–molecule reaction between NH+3 and H2 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7842-7849 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The rate coefficient for the ion–molecule reaction NH+3 +H2→NH+4+H has been calculated as a function of temperature with the use of the statistical phase space approach. The potential surface and reaction complex and transition state parameters used in the calculation have been taken from ab initio quantum chemical calculations. The calculated rate coefficient has been found to mimic the unusual temperature dependence measured in the laboratory, in which the rate coefficient decreases with decreasing temperature until 50–100 K and then increases at still lower temperatures. Quantitative agreement between experimental and theoretical rate coefficients is satisfactory given the uncertainties in the ab initio results and in the dynamics calculations. The rate coefficient for the unusual three-body process NH+3+H2+He→NH+4+H+He has also been calculated as a function of temperature and the result found to agree well with a previous laboratory determination.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.460119
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  • 3
    Digitale Medien
    Digitale Medien
    The cross-square rule for transport in electrolyte mixtures (1988)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 92 (1988), S. 1692-1695 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100317a060
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  • 4
    Digitale Medien
    Digitale Medien
    Second dissociation constant of 3-(N-morpholino)-2-hydroxypropanesulfonic acid and pH of its buffer solutions (1993)
    s.l. : American Chemical Society
    Analytical chemistry 65 (1993), S. 1084-1087 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00056a023
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  • 5
    Digitale Medien
    Digitale Medien
    Determination of phosphorus in copper-based alloys using ion-exchange chromatography and direct-current plasma emission spectrometry (1987)
    s.l. : American Chemical Society
    Analytical chemistry 59 (1987), S. 2872-2876 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac00151a009
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  • 6
    Digitale Medien
    Digitale Medien
    Analysis of the structures, infrared spectra, and Raman spectra for methyl, ethyl, isopropyl, and tert-butyl radicals (1991)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 113 (1991), S. 317-328 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00001a046
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  • 7
    Digitale Medien
    Digitale Medien
    Experiments on the control capacity of stomata of Picea abies (L.) Karst. after fumigation with ozone and in environmentally damaged material (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 14 (1991), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Abstract. With the aid of specifically designed potometer experiments, it is shown that, after ozone fumigation, twigs transpiring in gas exchange chambers show poor water balance in decreasing humidity. The quotient of water uptake to water loss never falls below 0.9 in healthy material because of the control capacity of the stomata. In twigs from a tree fumigated with ozone irregular and delayed stomatal closure results in values of 〈 0.5 or even lower, depending on the degree of damage. As a result, in dry air, the transpiration rates of fumigated twigs often fall far below those of the control material, even if they were higher than the latter in humid air. In analogous experiments, the difference in behaviour between twigs of densely (‘healthy’) and sparsely needled (‘damaged’) trees from the natural stand is comparable to the difference between controls and ozone-fumigated trees in most respects. In soil that is more or less dried out and after the best possible saturation of the twigs during the night, the transpiration rates of fumigated trees increase fairly strongly in the humid chamber air at dawn, but finally decrease more or less suddenly to lower values than in the controls. The results are placed in the context of the basic research on plant water relations and compared with histological changes in the stomatal apparatus after a period of fumigation as described earlier. Therefore, long-term effects of pollution can be explained as a specific distrubance of hydroregulation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3040.1991.tb01334.x
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  • 8
    Digitale Medien
    Digitale Medien
    Solarization; a physical control method for weeds and parasitic plants (Orobanche spp.) in Mediterranean agriculture (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 29 (1989), S. 0 
    Details
    ISSN: 1365-3180
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary. Experiments were conducted between 1985 and 1988 to evaluate the effect of duration and time of solarization on the control of two broom rapes (Orobanche aegyptiaca Pers., O. crenata Forsk.) and other weeds common in the fields of faba bean (Vicia faba L.) and lentil (Lens culinaris Medik.) in West Asia. Solarization was performed by applying clear polyethylene sheet to the soil for 0, 10, 20, or 40 days in 1985/86, 0, 30, or 40 days in 1986/87 and 0, 20, 30, 40 or 50 days in 1987/88 during the hot season (July and August) and for 50 days immediately before sowing during milder weather (September and October) in 1986/87. Best control was obtained with solarization for 30–50 days in the hot season. Maximum soil temperature under polyethylene at 5 cm was 55°C in 1985, 48°C in 1986 and 57°C in 1987. Broomrape dry weight decreased in the first experiment by more than 90% in both faba bean and lentil fields. Solarization controlled broom-rape and other weeds in the following two seasons when the soil was left undisturbed during the season of the treatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3180.1989.tb01310.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Untersuchungen zur Keimungsbiologie von sechs tropischen Segetalarten (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 28 (1988), S. 0 
    Details
    ISSN: 1365-3180
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Für die 6 untersuchten tropischen Segetalarten Ageratum conyzoides, Blechum brownei, Crassocephalum crepidioides, Mikania micrantha, Paspalum conjugatum und P. paniculatum lag die untere Temperaturgrenze bei der Keimung im Bereich von 10 bis 15(20)°C, die maximale bei ≤ 40°C, das Optimum zwischen 20 und 35°C. Ageratum conyzoides und C. crepidioides hatten etwas geringere Ansprüche an die Keimtemperatur als die übrigen Arten, was ihre vergleichsweise stärkere Verbreitung in Höhenlagen erklärt. Die Keim-temperaturen der beiden Vertreter aus den gemässigten Breiten, Alopecurus myosuroides und Chenopodium album, lagen bei 5 (Minimum), 15–25 (Optimum) bzw. 40°C (Maximum). Die Keimung von A. conyzoides, C. crepidioides und M. micrantha wurde bereits ab einem osmotischen Potential von - 1 bar negativ beeinflusst. Bei - 4,7 bar keimte von den 6 tropischen Arten nur noch P. paniculatum in geringem Umfang, während AL myosuroides und Ch. album bis -4,7 bar nicht beeinträchtigt wurden. Nach einjähriger trockener Lagerung keimten alle 6 tropischen Arten nur unter Lichteinfluss. Nach 20 Monaten keimten C. crepidioides und P. paniculatum auch in Dunkeln.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3180.1988.tb00784.x
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  • 10
    Digitale Medien
    Digitale Medien
    Water relations of Picea abies. II. Determination of the apoplastic water content and other water relations parameters of needles by means of capillary microcryoscopy and the pressure-volume (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 83 (1991), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Using the pressure volume analysis (PV analysis) on the shoots of Norway spruce (Picea abies [L.] Karst.) and the here presented capillary microcryoscopy of the needle press sap of the same shoots, it was possible to determine the amount of apoplastic water in the needles (Wan) as well as in the defoliated shoots (Was). Additionally, the bulk osmotic pressure at full water saturation in the symplast of the needles and defoliated shoots (πon and πos) was determined. The dependence of the bulk-averaged turgor pressure (Pt) on the water content and the relationship between the bulk modulus of elasticity of the needles (ɛn) and the bulk-averaged needle turgor pressure (Ptn) was shown with help of the PV analysis on the whole shoots and defoliated shoots. The study was conducted at the end of the vegetation period in 1987 and during winter 1988.The proportion of Wan in the total needle water content (Wtn) was 14% in September 1987 and 12.5% in March 1988. The respective percentage of Was in Wts were 27% and 25%. The amount of apoplastic water depended on the ratio of the dry weight of defoliated shoots to the dry weight of the whole shoots. A standard mean value for the amount of Wan in the total water content of the shoots (Wt) was therefore not possible. The bulk osmotic pressure at full water saturation in the needle symplasts was –1.9 MPa in September 1987 and –2.2 MPa in winter 1988. The respective values of the bulk osmotic pressures in the symplast of the defoliated shoots (πos) were –1.5 MPa and –1.7 MPa. Thus πon was 0.1 MPa lower and πos 0.3–0.4 MPa higher than the average osmotic pressure during full water saturation in the symplast of the whole shoots (πo).The relation between bulk-averaged turgor pressure and water content showed that during water loss Ptn dropped more rapidly than the turgor pressure of defoliated shoots (Pts). Consequently the needles were less elastic than the defoliated shoots. The turgor values of whole shoots followed an intemediate course between Ptn and Pts. The flat course of Pts seems to be the main reason for the often observed “plateau” of ψ-isotherms of whole shoots near full turgor.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1399-3054.1991.tb02156.x
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