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  • 1
    Electronic Resource
    Electronic Resource
    Preparation of new superconducting compounds using fluorination methods
    Amsterdam : Elsevier
    Journal of Fluorine Chemistry 54 (1991), S. 125 
    Details
    ISSN: 0022-1139
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0022-1139(00)83635-0
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  • 2
    Electronic Resource
    Electronic Resource
    Superconductivity in chlorine-treated La"2CuO"4
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 177 (1991), S. 330-336 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(91)90487-J
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  • 3
    Electronic Resource
    Electronic Resource
    A field test of inducible resistance to specialist and generalist herbivores using the water lily Nuphar luteum (1998)
    Springer
    Oecologia 116 (1998), S. 143-153 
    Details
    ISSN: 1432-1939
    Keywords: Key words Chemical ecology ; Induced defenses ; Plant-herbivore interactions ; Specialist vs. generalist herbivores ; Water lily
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We tested whether grazing by the specialist beetle Galerucella nymphaeae (Coleoptera: Chrysomelidae) induced resistance to herbivory in the water lily Nuphar luteum macrophyllum (Nymphaeaceae) using both the specialist beetle and the generalist crayfish Procambarus clarkii (Decapoda: Cambaridae). For 2 months, we allowed natural densities of beetles to develop on control plants of Nuphar, while removing beetles every 2–3 days from adjacent plants that were paired by location within our field site. By the end of the 2-month manipulation, beetle grazing had damaged twice as much leaf surface on control plants as on removal plants (30.6% vs. 14.2%, respectively). We then offered tissues from control and removal plants to adult and larval beetles and to crayfish in laboratory assays. Increased levels of previous attack by the specialist beetle either did not affect or increased water lily attractiveness to beetles, but significantly decreased attractiveness to the generalist crayfish. Beetle larvae did not feed preferentially on control vs. removal Nuphar in assays using either immature, undamaged leaves that had not yet reached the pond surface or intermediate aged leaves that had reached the surface and experienced some beetle grazing. Adult beetles consumed significantly more immature leaf tissue from the heavily grazed controls than from the less grazed removal plants but did not discriminate between control and removal leaves of intermediate age in either feeding or oviposition preference. In contrast, generalist crayfish consumed significantly more plant tissue from the less grazed treatment than from the more heavily grazed controls. Crude chemical extracts from Nuphar strongly deterred crayfish feeding, but neither phenolic content, protein content, nor differential effects of crude extracts from control vs. removal plants explained crayfish feeding on control versus removal leaves. Our assays suggest that induced resistance to crayfish may be chemically mediated, but the particular mechanisms producing this response remain unclear. Responses may be due to defensive metabolites that degrade rapidly following extraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050573
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  • 4
    Electronic Resource
    Electronic Resource
    Superconductivity in fluorinated La"1"."8"5"-"xNd"xSr"0"."1"5CuO"4 solid solution with 0=〈x=〈1
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 175 (1991), S. 435-441 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(91)90618-9
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  • 5
    Electronic Resource
    Electronic Resource
    Stabilization of new superconducting phases by low temperature flourination of La"2CuO"4-derived oxides
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 185-189 (1991), S. 583-584 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(91)92094-R
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  • 6
    Electronic Resource
    Electronic Resource
    Late Holocene eruptive activity at Nevado Cayambe Volcano, Ecuador (1998)
    Springer
    Bulletin of volcanology 59 (1998), S. 451-459 
    Details
    ISSN: 1432-0819
    Keywords: Key words Tephrochronology ; Pyroclastic flow ; Holocene ; Cayambe Volcano ; Ecuador
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Four Late Holocene pyroclastic units composed of block and ash flows, surges, ashfalls of silicic andesite and dacite composition, and associated lahar deposits represent the recent products emitted by domes on the upper part of Nevado Cayambe, a large ice-capped volcano 60 km northeast of Quito. These units are correlated stratigraphically with fallout deposits (ash and lapilli) exposed in a peat bog. Based on 14C dating of the peat and charcoal, the following ages were obtained: ∼910 years BP for the oldest unit, 680–650 years BP for the second, and 400–360 years BP for the two youngest units. Moreover, the detailed tephrochronology observed in the peat bog and in other sections implies at least 21 volcanic events during the last 4000 years, comprising three principal eruptive phases of activity that are ∼300, 800, and 900 years in duration and separated by repose intervals of 600–1000 years. The last phase, to which the four pyroclastic units belong, has probably not ended, as suggested by an eruption in 1785–1786. Thus, Cayambe, previously thought to have been dormant for a long time, should be considered active and potentially dangerous to the nearby population of the Interandean Valley.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050203
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  • 7
    Electronic Resource
    Electronic Resource
    Transcription in maize mitochondria: effects of tissue and mitochondrial genotype (1992)
    Springer
    Current genetics 22 (1992), S. 235-242 
    Details
    ISSN: 1432-0983
    Keywords: Maize mitochondria ; Transcription rate ; Maize tissue ; Mitochondrial genotype
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mitochondrial run-on assays were used to determine transcriptional rates for nine B37(N) maize mitochondrial genes. Quantiation by radiographic imaging detected a 15-fold range in transcriptional rates; the order of apparent promoter strength was rps12〉rrn26〉atp6〉rrn18〉cox2〉atpα〉atp9〉cox3〉 cob. By probing single-stranded DNAs of both polarities with the run-on-products we showed that gene-specific antisense transcription did not occur. We also tested whether relative transcriptional rates were dependent on either the mitochondrial genotype or the tissue from which the mitochondria were isolated. Although tissue-specific differences in transcriptional rates were not detected, significant variation in apparent promoter strength for at least one gene, rps12, was dependent on the cytoplasmic genotype; rps12 had a five-fold reduced transcriptional rate in B37(T), the Texas male cytoplasmic strain of maize. Pulse-chase experiments suggested that differential transcript stability was not a major determinant of steady state mitochondrial RNA levels. These results indicate not only that promoter strength is an important component of the regulation of transcript levels in maize mitochondria, but also that the strength of a specific gene promoter can be dependent on the cytoplasmic genotype. Finally, the high transcriptional rate of both ribosomal RNA genes and the one mitochondrially encoded ribosomal protein gene studied suggests coordinate transcriptional regulation of both RNA and protein components of the mitochondrial ribosome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351731
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  • 8
    Electronic Resource
    Electronic Resource
    Selective DNA amplification regulates transcript levels in plant mitochondria (1995)
    Springer
    Current genetics 28 (1995), S. 113-121 
    Details
    ISSN: 1432-0983
    Keywords: Transcription ; Plant ; Mitochondria ; Copy number ; Gene regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Most plant mitochondrial genomes exist as subgenomic-size fragments apparently due to recombination between repetitive sequences. This leads to the possibility that independently replicating subgenomic domains could result in mitochondrial gene copy number variation. We show, through Southern-blot analysis of both restricted and intact mtDNA, that there are gene-specific copy number differences in the monocot Zea mays. Comparison of two different maize genotypes, B37(N) and B37(T), a cytoplasmic male-sterile strain, reveal fewer gene copy number differences for B37(T) than for B37(N). In contrast to maize, significant gene copy number differences are not detected in the dicot Brassica hirta. We also demonstrate that mitochondrial transcriptional rates in both species are apparently dependent on gene copy number since relative rates determined by run-on analysis are proportional to relative gene copy numbers. Thus a direct relationship exists between plant mitochondrial gene copy number and transcriptional rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315776
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  • 9
    Electronic Resource
    Electronic Resource
    Electrophoretic karyotype of Cercospora kikuchii (1995)
    Springer
    Current genetics 27 (1995), S. 290-292 
    Details
    ISSN: 1432-0983
    Keywords: Cercospora kikuchii ; Electrophoretic karyotype ; Genome size Pulsed-field gel electrophoresis Cercosporin biosynthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Classical genetic analyses are not possible with the phytopathogenic fungus Cercospora kikuchii since no sexual stage has been identified. To facilitate gene mapping and to develop an understanding of the genome organization of C. kikuchii, an electrophoretic karyotype has been obtained using contour-clamped homogeneous electric field gel electrophoresis (CHEF). Eight chromosomes, two of which migrate as a doublet, have been separated into seven bands ranging from 2.0 to 5.5 Mb. Using this determination of chromosome number and size, the total genome size of C. kikuchii is estimated to be 28.4 Mb. In addition, genes encoding tubulin, ribosomal DNA, and four previously isolated light-enhanced cDNAs from C. kikuchii were assigned to chromosomes by Southern-hybridization analysis of CHEF blots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326163
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  • 10
    Electronic Resource
    Electronic Resource
    Le Volcan Popocatepetl (Mexique): structure, evolution pétrologique et risques (1984)
    Springer
    Bulletin of volcanology 47 (1984), S. 1-23 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Volcan Popocatepetl, which lies 70 km southeast of Mexico City, is one of the most famous andesite composite volcanoes in the world. With 5,450 m of elevation, it is the second highest peak of Mexico. Located 320 km north of the Middle America Trench, at the centre of the Mexican Volcanic Belt, Volcano Popocatepetl forms the southern active part of a northsouth volcanic complex, the northern part consisting of the eroded Volcano Iztaccihuatl. Since its earliest reported eruption in 1519, Volcano Popocatepetl has had a continuous fumarolic activity in its crater, and in frequent small eruptions (1720, 1802–1804, 1920). In contrast with this light activity, C14 data indicate pre-historical cycles of intense volcanism with paroxysmal pyroclastic eruptions (ash and pumice-flows) alternating with effusive phases and plinian air-fall deposits. The results of a volcanological study and the petrological characteristics of the main volcanic units show that Volcano Popocatepetl is composed of a primitive composite-volcano on which a recent summit cone is superimposed. It has been built during 2 very dissimilar volcanic periods linked by a transitional phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960537
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