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  • 1
    Electronic Resource
    Electronic Resource
    Ultraviolet-B-induced DNA lesions and their removal in wheat (Triticum aestivum L.) leaves (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 19 (1996), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Monoclonal antibodies were used in an enzyme-linked immunosorbent assay (ELISA) to detect the induction and removal of cyclobutane pyrimidine dimers (CPDs) and (6-4) photoproducts in DNA isolated from ultraviolet B (UV-B)-exposed primary wheat (Triticum aestivum L. cv. Chinese Spring) leaf tissue. The accumulation of lesions in the primary leaves of 6-d-old wheat seedlings was followed during the exposure of the leaf to an approximate dose of 3.6×10−1 W m−2 UV-B (Caldwell weighting). Significant increases in the levels of both CPDs and (6-4) photoproducts were detected in wheat leaves exposed to UV-B in the absence of other light However, only an increase in (6-4) photoproduct levels could be measured in wheat leaves exposed to the same UV-B source in the presence of supplemental white light. The removal of CPD antibody binding sites in the DNA after irradiation was rapid under conditions of high light intensity in contrast to the removal of (6-4) photoproduct antibody binding sites, which was significantly slower. The removal of CPDs appeared to be light dependent, this rate of removal decreasing with decreasing light fluences. The removal of (6-4) photoproducts also appeared light dependent, but to a lesser extent than the removal of CPDs, under the conditions studied here. Gene expression in the primary wheat leaf was measured and showed an up-regulation of chalcone synthase expression and a reduction in expression of chlorophyll a/b-binding protein (cab) in response to supplementary UV-B. No effect was seen on the expression of the other photosynthetic genes studied (the genes coding for the enzymes sedoheptu-lose 1,7-bisphosphatase and fructose 1,6-bisphosphatase). Measurement of the levels of DNA lesions in this same tissue showed that the observed changes in gene expression accompanied the appearance of UV-B induced lesions in the form of (6-4) photoproducts in the wheat leaf genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1996.tb00238.x
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  • 2
    Electronic Resource
    Electronic Resource
    The complete cDNA derived sequence of the rat prolyl 4-hydroxylase α subunit
    Amsterdam : Elsevier
    Gene 149 (1994), S. 391-392 
    Details
    ISSN: 0378-1119
    Keywords: Collagen biosynthesis ; fibrosis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-1119(94)90188-0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation of a novel protein kinase-encoding gene from yeast by oligodeoxyribonucleotide probing
    Amsterdam : Elsevier
    Gene 90 (1990), S. 87-92 
    Details
    ISSN: 0378-1119
    Keywords: Recombinant DNA ; Saccharomyces cerevisiae ; serine-threonine kinase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-1119(90)90442-T
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  • 4
    Electronic Resource
    Electronic Resource
    Characterisation of the CDC7 gene product of Saccharomyces cerevisiae as a protein kinase needed for the initiation of mitotic DNA synthesis
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Gene Structure and Expression 951 (1988), S. 335-343 
    Details
    ISSN: 0167-4781
    Keywords: (S. cerevisiae) ; CDC7 gene product ; DNA synthesis ; Mutagenesis,in vitro ; Protein kinase ; Transcription,in vitro
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-4781(88)90104-2
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  • 5
    Electronic Resource
    Electronic Resource
    Minute mantle melts (1995)
    [s.l.] : Nature Publishing Group
    Nature 375 (1995), S. 274-275 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MELTING of the Earth's mantle has long been understood to be the primary driving force behind most volcanism on the Earth's surface. In recent years, better experimental data, physical models and observations have much improved our ability to model mantle melting and apply the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/375274a0
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  • 6
    Electronic Resource
    Electronic Resource
    Experiments and models of anhydrous, basaltic olivine-plagioclase-augite saturated melts from 0.001 to 10 kbar (1996)
    Springer
    Contributions to mineralogy and petrology 124 (1996), S. 1-18 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  A new method for modeling fractional crystallization processes that involve olivine (ol), plagioclase (plag) and augite (aug) is presented. This crystallization assemblage is the major control on the chemical variations in mid-ocean ridge basalts. The compositional and temperature variations in ol-plag-aug saturated basalts over a range of pressures are described using empirical expressions. A data base of 190 experiments in natural and basalt-analog chemical systems is used to describe temperature, Al, Ca and Mg molar fractions as functions of Si, Fe, Na, Ti and K molar fractions and pressure. Increases in the abundances of Na and K cause Ca and Mg abundances to decrease and Al abundance to increase in ol-plag-aug saturated melts. The equations can be used to predict pressure and temperature and thus provide a useful thermobarometer. A model is described to calculate ol-plag-aug fractional crystallization as a function of pressure and melt composition, using melt and augite models developed here, combined with existing models for olivine-melt and plagioclase-melt equilibria. We compare the fractional crystallization sequence of ALV-2004-3-1 predicted from the models presented in this paper, Langmuir et al. (1992) modified by Reynolds (1995), Ghiorso and Sack (1995) and Ariskin et al. (1993) at 0.001 and 4 kbar. As an example the model is applied to estimate pressure of crystallization of glasses from the east flank of the East Pacific Rise at 11°45′N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004100050169
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  • 7
    Electronic Resource
    Electronic Resource
    High pressure phase relations of primitive high-alumina basalts from Medicine Lake volcano, northern California (1991)
    Springer
    Contributions to mineralogy and petrology 108 (1991), S. 253-270 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Anhydrous phase relations were determined at 1 atm and 10 to 15 kbar for primitive high-alumina basalts (79–35g and 82–72f) from Giant Crater at Medicine Lake volcano. These compositions are multiply saturated with olivine+augite+plagioclase+spinel+/-orthopyroxene near the liquidus at about 11 kbar. Experiments on mixtures of sample 79–35g with orthopyroxene and olivine determined the location of the multiple saturation boundaries where liquid coexists with the assemblage olivine+augite+orthopyroxene+plagioclase at 10 kbar and olivine+augite+orthopyroxene+spinel at 15 kbar. The mix experiments showed that primitive Medicine Lake high alumina basalts (HABs) are close in composition to liquids in equilibrium with a mantle lherzolite source containing olivine+augite+ orthopyroxene+spinel+plagioclase at 11 kbar. Orthopyroxene observed as a near liquidus phase in an 11 kbar experiment on sample 82–72f supports this conclusion. The most primitive HABs from Medicine Lake are low in K2O (0.07 wt.%), high in MgO (〉10 wt.%) and Ni (231 ppm), and have light-rare earth element depletions and large ion lithophile element enrichments. A model for the origin of these near-primary high-alumina basalts is that they are partial melts of a MORB-like mantle lherzolite source that has been enriched by a fluid component derived from the subducted slab. The HAB magma segregated from its mantle residue just below the base of the crust near the crust-mantle boundary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285935
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