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  • Allelopathy  (2)
  • palaeoreconstruction  (2)
  • Ammonium toxicity  (1)
  • Springer  (5)
  • Springer Nature
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Keywords
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  • Springer  (5)
  • Springer Nature
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  • 1
    Electronic Resource
    Electronic Resource
    New palaeomagnetic data from Central Iran and a Triassic palaeoreconstruction (1996)
    Springer
    International journal of earth sciences 85 (1996), S. 293-302 
    Details
    ISSN: 1437-3262
    Keywords: Iran ; palaeomagnetism ; Triassic ; Cretaceous ; Central Iran ; geotectonics ; palaeoreconstruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract New pole positions for Triassic and Cretaceous times have been obtained from volcanic and sedimentary sequences in Central Iran. These new results confirm the general trend of the Apparent Polar Wander Path (APWP) of the Central-East-Iran microplate (CEIM) from the Triassic through the Tertiary as published by Soffel and Förster (1983, 1984). Two new palaeopoles for the Triassic of the CEIM have been obtained; limestones and tuffs from the Nakhlak region yield a mean direction of 094.0°/25.0°, N=12, k=4.1,α 95=24.7°, after bedding correction, corresponding to a palaeopole position of 310.8°E; 3.9°S, and volcanic rocks from the Sirjan regions yield a mean direction of 114.5°/35.1°, N=44, k=45.9,α 95=3.2° after bedding correction and a palaeopole position of 295.8°E; 10.3°N. Combining these with the two previously published results yields a new palaeopole position of 317.5°E; 12.7°N, for the Triassic of the CEIM, thus confirming that large counterclockwise rotations of the CEIM have occurred since the Triassic time. New results have also been obtained from Cretaceous limestones from the Saghand region of the CEIM. The mean direction of 340.7°/26.3°, N=33, k=44.3,α 95=3.8°, and the corresponding palaeopole position of 283.1°E; 64.4°N, is in agreement with previously determined Cretaceous palaeopole positions of the CEIM. Furthermore, results have also been obtained from Triassic dolomite, limestone, sandstone and siltstone from the Natanz region, which is located to the west of the CEIM. A total of 161 specimens from 44 cores taken at five sites gave a mean direction of the five sites at 033.3°/25.1°, N=5, k=69.0,α 95=9.3° and a palaeopole position of 167.2°E; 53.7°N. They pass the positive fold test of McElhinny (1964) on the level of 99% confidence. This pole position is in fairly good agreement with the mean Triassic pole position of the Turan Plate (149°E; 49°N). It indicates that the area of Natanz has not undergone the large counterclockwise rotation relative to the Turan plate since the Triassic, which has been shown for the CEIM. A Triassic palaeogeographic reconstruction of Iran, Arabia (Gondwana) and the Turan Plate (Eurasia) is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02422235
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of nitrate, ammonium, light and a plastidic factor on the appearance of multiple forms of nitrate reductase in mustard (Sinapis alba L.) cotyledons (1989)
    Springer
    Planta 177 (1989), S. 74-83 
    Details
    ISSN: 1432-2048
    Keywords: Ammonium toxicity ; Nitrate reductase (multiple forms) ; Phytochrome ; Plastidic factor ; Sinapis (nitrate reductase)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In mustard (Sinapis alba L.) cotyledons, four different forms of nitrate reductase (NR) can be separated by anion-exchange chromatography. Two of these forms (NR1 and NR2) appear in the presence of NO 3 - while the other two (NR3 and NR4) appear as a response to the application of NH 4 + as the sole nitrogen source. In the presence of NH4NO3, NR3 appears to be superimposed on nitrate-induced NR1 and NR2 while the NH 4 + -induced appearance of NR4 is totally abolished in the presence of equimolar amounts of NO 3 - . The appearance of NR1, NR2 and NR3 is strongly stimulated by red light pulses which operate via the far-red-absorbing form of phytochrome (Pfr), whereas the appearance of NR4 requires continuous light (likewise operating through pytochrome). Continuous red light is more effective in this case than continuous far-red light. Analysis of the data shows that the mode of action of phytochrome (Pfr) is the same in the case of the appearances of NR1 and NR2, whereas it is quantitatively different in the case of NR3 and totally different in that of NR4. A ‘plastidic factor’ has previously been postulated to be obligatorily involved in the transcriptional control of nuclear genes encoding for proteins destined for the chloroplast. Photooxidative damage of the plastid is postulated to destroy the ability of the organelle to produce this signal. If the plastids are damaged by photooxidation, the action of nitrate and phytochrome on the appearance of NR is abolished. The plant cell regulates the appearance of nitrate-induced NR, which is cytosolic, as if it were a plastidic protein. The appearance of NR3 depends on the plastidic factor in principally the same way as that of NR1 and NR2 whereas NR4 is totally independent of the plastidic factor. The data document particular kinds of interaction between controlling factors (light, nitrate, ammonium, plastidic factor) which affect gene expression in plants. These intricacies of regulation have so far not been considered in molecular studies on NR-gene expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392156
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  • 3
    Electronic Resource
    Electronic Resource
    New palaeomagnetic data from Central Iran and a Triassic palaeoreconstruction (1996)
    Springer
    Geologische Rundschau 85 (1996), S. 293-302 
    Details
    ISSN: 0016-7835
    Keywords: Key words Iran ; palaeomagnetism ; Triassic ; Cretaceous ; Central Iran ; geotectonics ; palaeoreconstruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  New pole positions for Triassic and Cretaceous times have been obtained from volcanic and sedimentary sequences in Central Iran. These new results confirm the general trend of the Apparent Polar Wander Path (APWP) of the Central-East-Iran microplate (CEIM) from the Triassic through the Tertiary as published by Soffel and Förster (1983, 1984). Two new palaeopoles for the Triassic of the CEIM have been obtained; limestones and tuffs from the Nakhlak region yield a mean direction of 094.0°/25.0°, N=12, k=4.1, α95=24.7°, after bedding correction, corresponding to a palaeopole position of 310.8°E; 3.9°S, and volcanic rocks from the Sirjan regions yield a mean direction of 114.5°/35.1°, N=44, k=45.9, α95=3.2° after bedding correction and a palaeopole position of 295.8°E; 10.3°N. Combining these with the two previously published results yields a new palaeopole position of 317.5°E; 12.7°N, for the Triassic of the CEIM, thus confirming that large counterclockwise rotations of the CEIM have occurred since the Triassic time. New results have also been obtained from Cretaceous limestones from the Saghand region of the CEIM. The mean direction of 340.7°/26.3°, N=33, k=44.3, α95=3.8°, and the corresponding palaeopole position of 283.1°E; 64.4°N, is in agreement with previously determined Cretaceous palaeopole positions of the CEIM. Furthermore, results have also been obtained from Triassic dolomite, limestone, sandstone and siltstone from the Natanz region, which is located to the west of the CEIM. A total of 161 specimens from 44 cores taken at five sites gave a mean direction of the five sites at 033.3°/25.1°, N= 5, k=69.0, α95=9.3° and a palaeopole position of 167.2°E; 53.7°N. They pass the positive fold test of McElhinny (1964) on the level of 99% confidence. This pole position is in fairly good agreement with the mean Triassic pole position of the Turan Plate (149°E; 49°N). It indicates that the area of Natanz has not undergone the large counterclockwise rotation relative to the Turan plate since the Triassic, which has been shown for the CEIM. A Triassic palaeogeographic reconstruction of Iran, Arabia (Gondwana) and the Turan Plate (Eurasia) is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050075
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of Willows (Salix brachycarpa) on Populations of Salicylate-Mineralizing Microorganisms in Alpine Soils (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 2049-2057 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; alpine soils ; salicylate ; Salix ; SIGR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract We used the substrate-induced growth-response (SIGR) method to quantify salicylate-mineralizing microbes and total microbial biomass in soils from under willows (Salix brachycarpa) and in surrounding meadows dominated by the sedge Kobresia myosuroides. Willows had a strong effect on the biomass of salicylate-mineralizing microbes in both years of this study. There were always higher biomass levels of salicylate mineralizers in soils from under Salix (4.6–10.1 μg C/g) than under Kobresia (0.23–0.76 μg/g). In contrast, total microbial biomass was not significantly different under these plant species in 1996 and was only higher under Salix on one date in 1997. These results show that the standing biomass and activity of salicylate-mineralizing microbes can be greatly enhanced by salicylate-producing plants in the field. Given this finding, it is unlikely that simple phenolic compounds like salicylate would persist for very long in soil beneath the plants that produce them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005508230152
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  • 5
    Electronic Resource
    Electronic Resource
    Degradation of juglone by soil bacteria (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 1561-1571 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; biodegradation ; humic acids ; Juglans nigra ; juglone ; nonlinear regression ; Pseudomonas putida biovar A
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Bacteria that can degrade juglone (5-hydroxy-1,4-naphthoquinone) were isolated from soil beneath black walnut trees. Autecological studies with one of these bacteria (Pseudomonas J1), demonstrated that it could grow rapidly using juglone as its sole source of carbon and energy. Using nonlinear regression analysis and the Monod equation, it was determined that this bacterium had a high affinity for juglone (K s = 0.95 μg/ml).Pseudomonas J1 can also utilize other aromatic compounds from plants as its sole source of carbon and energy. Compounds such as chlorogenic acid, ferulic acid, gallic acid, and 2-hydroxy-1,4-naphthoquinone (Lawson) were rapidly degraded byPseudomonas J1. The rapid degradation of juglone and other suspected allelochemicals by soil bacteria make it unlikely that these compounds are important mediators of plant-plant interactions under natural conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012522
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