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  • 1
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    Inconsistent change in surface hydrography of the eastern Arabian Sea during the last four glacial–interglacial intervals (2019)
    Cambridge University Press
    In:  EPIC3Geological Magazine, Cambridge University Press, pp. 1-12, ISSN: 0016-7568
    Details
    Publication Date: 2019-12-08
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
    Electronic Resource
    Electronic Resource
    Genetics of Panicle Exsertion in Cold-Tolerant Rice (Oryza sativa) (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 111 (1993), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Four cold-tolerant rice varieties, viz. ‘Khonorullo’, ‘Namyi’, ‘Abor B’ and ‘Meghalaya-1’ were crossed with two cold-susceptible ones, viz. ‘Pusa 33’ and ‘Subhadra’ (DR92), in all possible combinations to study the inheritance of gene(s) governing panicle exsertion and their allelic relationship among cold-tolerant varieties. F1 hybrids of all the crosses showed complete panicle exsertion indicating dominance of this trait. Segregation pattern of panicle exsertion in F2 and backcrosses show that all the four cold-tolerant varieties possessed a single dominant gene designated as Ctr-1. Absence of segregation for panicle exsertion in an F2 generation obtained from intercrosses of cold-tolerant varieties suggests that the dominant genes in all the four cultivars are allelic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1993.tb00610.x
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  • 3
    Electronic Resource
    Electronic Resource
    Current injection in insulator with two sets of distributed traps-I (1995)
    Springer
    Czechoslovak journal of physics 45 (1995), S. 863-870 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The complete picture of the single injection current flow in insulators with two sets of traps distributed in energy is given for the situation in which the concentration of the lower trap distribution is larger than or equal to that of the upper distribution. A new approach for the solution of the problem is given with the help of regional approximation method. The results are compared with the previously reported experimental work to confirm the correctness of the analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01691398
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  • 4
    Electronic Resource
    Electronic Resource
    Inhibition of salvinia (Salvinia molesta Mitchell) by parthenium (Parthenium hysterophorus L.). II. Relative effect of flower, leaf, stem, and Root residue on Salvinia and Paddy (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 3123-3131 
    Details
    ISSN: 1573-1561
    Keywords: Parthenium hysterophorus ; Salvinia molesta ; Oryza sativa ; biomass ; inhibitory activity ; chlorophyll ; carotenoid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The relative effect of parthenium (Parthenium hysterophorus L.) plant residue on growth of salvinia and paddy seedlings was studied. The inhibitory activity of the residue as shown by its effect on the number of healthy fronds (HFN) and biomass was in the order: flower and leaf 〉 stem and root. The flower (FP) and leaf (LP) residue was lethal at and above 0.75% (w/v, the convention used throughout), and inhibitory at lower doses. The stem (SP) and root (RP) residue supported growth of salvinia at lower doses and were slightly inhibitory at higher (1.25%) dose. All the above residue types supported the growth of paddy seedlings except at 1.25%, the highest concentration tested, which was slightly inhibitory. The amounts of chlorophylla, b, total chlorophyll, and carotenoid pigments in the leaves of the paddy seedlings grown in the medium were comparable to the amounts in the leaves of seedlings grown in distilled water. This demonstrates beneficial effects of the treatments. The study shows that salvinia is more sensitive to allelochemicals released by FP and LP into the aqueous medium. Both salvinia and paddy responded similarly to SP and RP by supporting growth at lower doses, probably due to lower levels of inhibitors. The results are discussed with reference to the possible role of allelopathy by parthenium on the population dynamics of aquatic weeds in natural ecosystems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033715
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  • 5
    Electronic Resource
    Electronic Resource
    Inhibition of salvinia (Salvinia molesta Mitchell) by parthenium (Parthenium hysterophorus L.). I. Effect of leaf residue and allelochemicals (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 3111-3122 
    Details
    ISSN: 1573-1561
    Keywords: Salvinia molesta ; growth inhibition ; Parthenium hysterophorus ; leaf residue ; membrane integrity ; dehydrogenase activity ; chlorophyll ; water absorption ; allelochemicals ; phenolics ; parthenin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Parthenium (Parthenium hysterophorus L.) leaf residue (LP, leaf powder) inhibited salvinia (Salvinia molesta Mitchell) biomass and the number of healthy fronds at 0.25% (w/v) and killed the treated plants at and above 0.75% (w/v) in about 5–15 days, depending on the quantity of the residue. At the lethal dose, the LP caused an abrupt desiccation of above-water plant parts, probably due mainly to root dysfunction. This was concurrent with the loss of dehydrogenase activity in, and an increase in solute leakage from, the roots and loss of chlorophylla, b, and total chlorophyll contents in the fronds, resulting in death of the treated plants. The LP appears inhibitory to salvinia through affecting macromolecules—proteins, lipids, and nucleic acids. The inhibitory activity of LP at the lethal dose suspended in water was completely lost when allowed to stand for 30 days under outdoor conditions and promoted growth of the salvinia plants placed in it. The standard allelochemicals, including those present in parthenium LP, except parthenin andp-hydroxybenzoic acid, did not inhibit growth up to 100 ppm. However, parthenin andp-hydroxybenzoic acid killed salvinia plants at 100 and 50 ppm, respectively. Sincep-hydroxybenzoic acid is unlikely to be present at such a high concentration, parthenin appears to be one of the main allelochemicals responsible for the inhibitory effect of parthenium leaf residue on salvinia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033714
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  • 6
    Electronic Resource
    Electronic Resource
    Inhibitory effect of parthenium (Parthenium hysterophorus L.) residue on growth of water hyacinth (Eichhornia crassipes Mart Solms.) II. Relative effect of flower, leaf, stem, and root residue (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 2663-2670 
    Details
    ISSN: 1573-1561
    Keywords: Parthenium hysterophorus ; Eichhornia crassipes ; Triticum aestivum ; biomass ; inhibitory activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The relative effect of residue of leaf, flower, stem, and root of parthenium (Parthenium hysterophorus L.) on growth of water hyacinth was studied. The inhibitory activity of the residue as shown by its effect on biomass and healthy leaf number (HLN) of treated plants was in the order: leaf and flower 〉stem 〉root. Total phenolic acids in the medium after 72 hr of suspending the plant part residue were maximum in flower followed by leaf, root, and stem, successively. The dry leaf powder (DLP) and dry flower powder (DFP) at and above 0.50% (w/v) and dry stem powder (DSP) at 1.00% (w/v) killed water hyacinth in about one month. Dry root powder (DRP) at the highest dose (1.25% w/v) reduced the growth of the treated plants drastically, but the plants recovered after about one month. The DSP at 0.50% (w/v) and DRP at 0.25–0.75% (w/v) supported growth of treated plants, probably due to lower levels of inhibitors, allowing utilization of constituents of the residue as nutrients. Using wheat seedlings as a reference material, it was observed that in aquaculture at different levels of parthenium plant parts residue, water hyacinth plants were much more sensitive to inhibitory activity. Thus, water hyacinth is suggested as a material for bioassay of inhibitory activity of the parthenium plant residue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980699
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  • 7
    Electronic Resource
    Electronic Resource
    Inhibitory effect of parthenium (Parthenium hysterophorus L.) residue on growth of water hyacinth (Eichhornia crassipes mart solms.) I. Effect of leaf residue (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 2651-2662 
    Details
    ISSN: 1573-1561
    Keywords: Allelopathy ; Parthenium hysterophorus leaf residue ; Eichhornia crassipes growth inhibition ; membrane integrity ; dehydrogenase activity ; chlorophyll ; water absorption ; phenolic acids ; inhibitors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The allelopathic effect of parthenium (Parthenium hysterophorus L.) leaf residue (dry leaf powder, DLP) on water hyacinth (Eichhornia crassipes Mart Solms.) was studied. The treatment caused wilting starting from the margins of the older leaves and desiccation of above-water plant parts (shoot). Appearance, persistence, and disappearance of symptoms depended on the level and duration of the treatment and recovery of the treated plants, if it occurred. The treatment drastically reduced the number of healthy leaves (HLN) and the plant biomass at 0.25% (w/v) DLP; the treated plants recovered in about one month. At and above 0.50% (w/v) DLP, the plants were killed in about one month, resulting in sinking of the dead mass in water. Physiological effects of the treatment included deterioration of membrane integrity, loss of dehydrogenase activity with concurrent drastic reduction or total failure of water absorption by the roots, and reduction of chlorophyll contents in the leaves. The results indicate that the inhibitors leached out of the DLP affected the water hyacinth plants through changes in macromolecules: protein, lipid, and nucleic acid, resulting in root dysfunction and other inhibitory activities both in the root and shoot. Phenolic and other inhibitors including those found in the parthenium plant (except sesquiterpene lactones which have not been tested) at 50 ppm, exceptp-hydroxybenzoic acid, did not affect the treated plants. Such a high concentration of the allelochemicals is unlikely to be present in the medium at the lethal dose (0.50% w/v) of the DLP. Even withp-hydroxybenzoic acid, the plants recovered subsequently and grew normally. Thus, it appears that other allelochemicals including sesquiterpene lactones were mainly responsible for the inhibitory activity of the DLP on water hyacinth plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980698
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  • 8
    Electronic Resource
    Electronic Resource
    Phytotoxicity of sesquiterpene lactone parthenin on aquatic weeds (1996)
    Springer
    Journal of chemical ecology 22 (1996), S. 151-160 
    Details
    ISSN: 1573-1561
    Keywords: Aquatic weeds ; parthenin ; biomass ; membrane integrity ; dehydrogenase activity ; chlorophyll ; water use
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The sesquiterpene lactone parthenin, one of the major toxins in an obnoxious weed, parthenium (Parthenium hysterophorus L.), was toxic at 50 ppm to the floating aquatic weeds pistia (Pistia stratiotes L.) and lemna (Lemna pausicostata Hegelm.) and at 100 ppm to water hyacinth (Eichhornia crassipes Mart Solmns.), salvinia (Salvinia molesta Mitchell), azolla (Azolla nilotica Decne.), and spirodella (Spirodella polyrhiza L. Schleid). The lethal dose for the submerged weeds najas (Najas graminea Del.), ceratophyllun (Ceratophyllum demersun L.), and hydrilla (Hydrilla verticillata L. f. Royle) was 25 ppm. The submerged aquatic weeds were more sensitive to parthenin. Water hyacinth was used as a representative for studying the phytotoxicity of parthenin on aquatic weeds. Inhibition of water hyacinth by parthenin was associated with decline in water use, root dysfunction, excessive leakage of solutes from roots indicative of massive damage to cellular membranes, loss of dehydrogenase activity in the roots, and loss of chlorophyll in the leaves. Plant death occurred in a period of one to two weeks. Parthenin phytotoxicity is gradually lost in an aquatic environment as a lethal dose became nonlethal in about 30 days under outdoor conditions. Possible buildup of a toxin concentration may affect population dynamics and a shift in the aquatic weed flora in the immediate area of parthenium stands. Accumulation of the toxin in an aquatic environment, however, at a level sufficient to produce such changes in a natural ecosystem as a consequence of rain washing parthenium plants and leaching of toxin from their residue appears to be unlikely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040206
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  • 9
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    Effect of diameter and surface roughness on ultrasonic properties of GaAs nanowires (2015)
    American Institute of Physics
    Details
    Publication Date: 2015-02-21
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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  • 10
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    Complementary gene interaction and xenia effect controls the seed coat colour in interspecific cross between Trifolium alexandrinum and T. apertum (2019)
    Springer
    Details
    Publication Date: 2019-04-01
    Print ISSN: 0016-6707
    Electronic ISSN: 1573-6857
    Topics: Biology
    Published by Springer
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