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  • Chemistry  (3)
  • 157-951B; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg157; Ocean Drilling Program; ODP; Sample code/label; South Atlantic Ocean; Uniform resource locator/link to image  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    A multi-nucleate male-sterile mutant of maize with gametophytic expression (1997)
    Springer
    Sexual plant reproduction 10 (1997), S. 22-26 
    Details
    ISSN: 1432-2145
    Schlagwort(e): Key words Maize ; Pollen ; Male sterility ; Gametophytic mutants
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  In order to dissect the complex genetic system that controls pollen development, we have undertaken a program of transposon insertion mutagenesis, with the purpose of producing mutations in gametophytically acting genes that are important for this process. The present work reports the developmental cytology of one of the mutants isolated, gaMS-2 (gametophytic male sterile-2). A peculiar feature of the mutant grains was lack of differentiation between the vegetative and the generative nuclei, leading to alteration in number, conformation and placement of nuclei. At anthesis, the grains carrying the mutant allele are about 40% of the normal grain size, contain a very reduced amount of starch and exhibit various nuclear abnormalities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004970050063
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  • 2
    Digitale Medien
    Digitale Medien
    Male gametophytic selection in maize (1982)
    Springer
    Theoretical and applied genetics 63 (1982), S. 249-254 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Maize ; Pollen ; Gametophytic selection ; Competitive ability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary There is evidence that male gametophyte selection is a widespread phenomenon in higher plants. The pollen tube growth rate is one of the main components of gametophyte selective value; genetic variability for this trait, due to the effect of single genes or to quantitative variation, has been described in maize. However, indication of gametophytic selection has been indirectly obtained; its effect was revealed by the positive relation observed between gametophyte competitive ability and sporophyte metrical traits. This paper considers the results of selection applied to gametophyte populations produced from single plants. The competitive ability of the lines was evaluated in comparison with that of a standard line by means of the pollen mixture technique. Sporophytic traits were measured in the hybrid progeny obtained by crossing selected S3 and S4 families with an unrelated single cross and an inbred line. Gametophyte selection produced inbred lines with high gametophyte competitive ability. In view of the selection procedure adopted, this result was interpreted as an indication of haploid expression of genes involved in the control of pollen tube growth. Moreover, this gametophytic trait was positively correlated with sporophytic traits (seedling weight, kernel weight and root tip growth in vitro), indicating that both groups of characters have a common genetic basis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00304004
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  • 3
    Digitale Medien
    Digitale Medien
    Untersuchung der teilschritte der ethylen-hochdruck-polymerisation, 1. Druckabhängigkeit der einzelnen geschwindigkeitskonstanten (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 207-216 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: In order to calculate the average molecular weight, the molecular weight distribution or the branching of low density polyethylene, the individual values of the rate constants of the different reactions involved in the free radical polymerization are required. The method of rotating sector was applied to determine the rate constants of chain propagation and chain termination in a wide range of temperatures and pressures. This first part of the work reports the influence of the pressure. It was found that the rate constant kp of the chain propagation increases with rising pressure whereas the rate constant kt of chain termination decreases. The effect of the pressure on kp can be explained in terms of the activation volume. The decrease of kt with pressure is caused by a diffusion controlled termination reaction.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1983.021840120
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  • 4
    Digitale Medien
    Digitale Medien
    Untersuchung der teilschritte der ethylen-hochdruckpolymerisation, 2Teil 1: cf.1.. Druck- und temperaturabhängigkeit der einzelnen geschwindigkeitskonstanten (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 849-859 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: In the first part of this series the individual rate constants of the radical polymerization of ethylene are reported in dependency of pressure at 405 K. By further measurements under 500 - 1750 bar and 400 - 470 K, using again the method of the rotating sector, the dependency of the rate constants on both pressure and temperature was determined. With increasing temperature the rate constant of chain growth kp as well as that of chain termination kt increases. With increasing pressure, kp increases, whereas kt decreases because of the diffusion controlled termination reaction. For the chain growth an activation energy of Ep = 37 kJ/mol and an activiation volume of Δvp≠ = -25,5 ml/mol was found. The activiation parameters of the chain termination are Et = 9,9 kJ/mol and Δvt≠ = 7 ml/mol. Based on these results and literature data the rate constants of different chain transfer reactions involved in the high pressure polymerization of ethylene and their dependency on temperature and pressure were evaluated.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1983.021840419
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  • 5
    Digitale Medien
    Digitale Medien
    Regiospecific Synthesis of 3,4-Disubstituted Furans and ThiophenesDedicated to Professor Xi-Kui Jiang, Shanghai Institute of Organic Chemistry, on the occasion of his 70th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 459-466 
    Details
    ISSN: 0947-3440
    Schlagwort(e): Furans ; Thiophens ; Palladium catalysis ; Coupling reactions ; Heterocycles ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The regiospecific synthesis of 3,4-disubstituted furans and thiophenes is reviewed. Our initial approach used 3,4-bis(tri-n-butylstannyl)furan as a building block, which led to many structurally diverse 3,4-disubstituted furans. Another avenue was explored by using 3,4-bis(trimethylsilyl)furan and 3,4-bis(trimethylsilyl)thiophene as precursors. A variety of unsymmetrically 3,4-disubstituted furans and thiophenes were prepared in this way. The advantages of our strategy lie in its stepwise manner as well as its prospect of yielding 3,4-disubstituted furans and thiophenes with rather different substitution pattern.
    Zusätzliches Material: 5 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jlac.199719970304
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  • 6
    facet.materialart.
    Unbekannt
    Section images from ODP Hole 157-951B (2005)
    PANGAEA
    Details
    Publikationsdatum: 2024-01-09
    Schlagwort(e): 157-951B; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg157; Ocean Drilling Program; ODP; Sample code/label; South Atlantic Ocean; Uniform resource locator/link to image
    Materialart: Dataset
    Format: text/tab-separated-values, 20 data points
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    DATEN PANGAEA
  • 7
    facet.materialart.
    Unbekannt
    Visual core description (VCD) from ODP Hole 157-951B (2005)
    PANGAEA
    Details
    Publikationsdatum: 2024-01-09
    Schlagwort(e): 157-951B; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg157; Ocean Drilling Program; ODP; Sample code/label; South Atlantic Ocean; Uniform resource locator/link to image
    Materialart: Dataset
    Format: text/tab-separated-values, 140 data points
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    DATEN PANGAEA
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