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  • 1990-1994  (5)
  • 1985-1989  (28)
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  • 1
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    Stable isotope composition of secondary carbonates from basalric lavas of ODP Hole 104-642E (1989)
    PANGAEA
    In:  Supplement to: Love, David A; Frape, Shaun K; Gibson, Ian L; Jones, M G (1989): The d18O and d13C isotopic composition of secondary carbonates from basaltic lavas cored in Hole 642E, Ocean Drilling Program Leg 104. In: Eldholm, O; Thiede, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 104, 449-455, https://doi.org/10.2973/odp.proc.sr.104.140.1989
    Details
    Publication Date: 2024-01-09
    Description: Hole 642E is located near the outer margin of the Voring Plateau in the Norwegian Sea. The thick pile of basaltic lavas penetrated during drilling are variably altered with extensive development of calcite, which fills vesicles and fractures along with saponite and celadonite. delta13C results, determined by mass spectrometry, show that most carbonates above about 1040 m have values between -2.5 and -5.5 per mil (PDB), but a few samples at approximately 1090 m have depleted delta13C values down to -26.3 per mil. Below 1100 m the delta13C values decrease from -6.0 per mil to -12 per mil. The delta 18O values range between -1.9 and -13.7 per mil (PDB), and generally decrease with depth. The results are interpreted as indicating that the calcites were precipitated from cool seawater percolating through the basalt pile at waterrrock of less than 10:1, during seawater incursion at about 54 Ma. The progressive depletion with depth may result from subsequent reequilibration at temperatures below those of formation, and the geothermal gradient on the Wring Plateau appears to have decreased with time. The very depleted values of delta13C for carbonates around the 1090-m level are probably related to organic matter from an underlying volcaniclastic unit.
    Keywords: 104-642E; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    Unknown
    (Table 3) Calculated formation temperatures for secondary calcites in ODP Hole 104-642E (1989)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 104-642E; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP; Sample code/label; Temperature, calculated
    Type: Dataset
    Format: text/tab-separated-values, 138 data points
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  • 3
    facet.materialart.
    Unknown
    (Table 1) Stable carbon and oxygen isotope composition of secondary carbonates of ODP Hole 104-642E (1989)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 104-642E; Comment; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg104; Mass spectrometer VG Micromass 903; Norwegian Sea; Ocean Drilling Program; ODP; Sample code/label; δ13C; δ18O; δ18O, calcite
    Type: Dataset
    Format: text/tab-separated-values, 100 data points
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  • 4
    Electronic Resource
    Electronic Resource
    Electroporation of cells (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 79 (1990), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: By measuring uptake of the membrane impermeable dye. phenosafranine, it can be shown that the plasma membrane of intact cells within cell aggregates can be reversibly permeabilized by electroporation. However, the plant cell wall is a barrier to DNA uptake by intact cells, although under certain circumstances expression of DNA, electroporated into intact cells, can be demonstrated. The level of expression is about 20–50 times lower than that obtained by electroporation of protoplasts, and depends on cell wall properties and pretreatments of cell aggregates. In contrast, efficient transformation of whole cells of bacteria and yeasts can be achieved by electroporation. Factors which influence DNA transfer into whole plant cells and the possibility of stable transformation are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1990.tb05881.x
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  • 5
    Electronic Resource
    Electronic Resource
    Growth and gibberellin relations of the extreme dwarf dx tomato mutant (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 73 (1988), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The extreme dwarf dx tomato (Lycopersicon esculentum Mill.) mutant has very short internodes which were found to contain shorter and fewer epidermal cells. The leaves are highly abnormal. The mutant showed a substantial stem growth response to GA3, without approaching normal stature or morphology. The active gibberellin GA1 and its precursors GA19 and GA20 were identified by coupled gas chromatography-mass spectrometry (GC/MS) in dx shoots. Quantitative GC/MS revealed that GA20 accumulated to far higher levels than normal in stems and leaves of the mutant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1988.tb00594.x
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  • 6
    Electronic Resource
    Electronic Resource
    Improved efficiency of genotype-dependent regeneration from protoplasts of important potato cultivars (1986)
    Springer
    Plant cell reports 5 (1986), S. 72-76 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The regeneration of protoplasts from potato (Solanum tuberosum L.) cvs. Desiree and King Edward has been significantly improved. Different shoot culture media were required for the release of viable protoplasts from cvs. Maris Piper and Desiree, and the response of protoplasts to different culture conditions depended upon the cultivar genotype of the protoplast source. Using protoplast isolation media containing 6mM CaCl2 improved protoplast viability and culture in enriched media lead to the reproducible and relatively efficient recovery of colonies from protoplasts of these cultivars. Over 70% of protoplast-derived calli from King Edward and Desiree regenerated shoots. Many shoots were grown to mature plants in soil. This is the first report of the regeneration of mature Desiree plants from protoplasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00269723
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  • 7
    Electronic Resource
    Electronic Resource
    Resistance to potato leaf roll virus and potato virus Y in somatic hybrids between dihaploid Solanum tuberosum and S. brevidens (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 113-117 
    Details
    ISSN: 1432-2242
    Keywords: Potato ; Solanum brevidens ; somatic hybrid ; PLRV ; PVY
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Many somatic fusion hybrids have been produced between a dihaploid potato Solanum tuberosum and the sexually-incompatible wild species S. brevidens using both chemical and electrical fusion techniques. S. brevidens was resistant to both potato leaf roll virus (PLRV) and potato virus Y (PVY), the viruses being either at low (PLRV) or undetectable (PVY) concentrations as determined by enzyme-linked immunosorbent assay (ELISA). The S. tuberosum parent was susceptible to both viruses. A wide range of resistance, expressed as a decrease in virus concentration to both viruses was found amongst fusion hybrids, four of which were especially resistant. The practicality of introducing virus resistance from S. brevidens into cultivated potatoes by somatic hybridisation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00288840
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of endogenous abscisic acid levels in immature cereal embryos during in vitro culture (1988)
    Springer
    Planta 173 (1988), S. 110-116 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid in embryos ; Embryo development ; Hordeum (abscisic acid) ; Lectin ; Osmotic stress ; Triticum (abscisic acid)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Levels of endogenous abscisic acid (ABA) in immature wheat (Triticum aestivum cv. Timmo) and barley (Hordeum vulgare cv. Golden Promise) embryos have been determined by enzyme-linked immunosorbent assay. Embryos of both cereal species showed an increase in ABA content during development on the parent plant. Immature embryos were excised and cultured in vitro on nutrient media that led to precocious germination or on media containing 9% (w/v) mannitol that maintained their developmental arrest. Barley and wheat embryos responded to these culture conditions in an identical manner with respect to changes in morphology, fresh weight, protein and lectin content. However, in complete contrast, the ABA content of barley embryos increased by an order of magnitude during culture on mannitol, whereas that of wheat embryos showed no significant change. The results are discussed within the context of the role of ABA in the regulation of embryo development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394495
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  • 9
    Electronic Resource
    Electronic Resource
    Production of somatic hybrids by electrofusion in Solanum (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 260-266 
    Details
    ISSN: 1432-2242
    Keywords: Solanum tuberosum ; Solanum brevidens ; electrofusion ; somatic hybrids ; cytology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Conditions are described for large scale electrofusion of mesophyll protoplasts of dihaploid S. tuberosum with those of diploid S. brevidens. Overall fusion frequencies of 20%–30% were achieved, and following fusion, large numbers of protoplast-derived calli were obtained. Putative somatic hybrid plants were selected from the regenerated shoots by examining their morphological characteristics. Twenty-one somatic hybrids were confirmed by isoenzyme analysis and six somatic hybrids were further confirmed by Southern hybridization. Tetraploid hybrids were obtained, but cytogenetic studies indicated that more of the regenerated hybrids were hexaploid than had previously been found following chemical fusion of the same partners. Some advantages of electrofusion over chemical fusion are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257854
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  • 10
    Electronic Resource
    Electronic Resource
    Stable transformation of sugarbeet protoplasts by electroporation (1989)
    Springer
    Plant cell reports 8 (1989), S. 71-74 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Conditions were optimized for the culture, antibiotic selection and stable transformation by electroporation of suspension culture protoplasts of sugarbeet,Beta vulgaris L.. Highest plating efficiencies (up to 65% at day 21) were obtained if protoplasts were cultured in PGO salts (de Greef and Jacobs, 1979) supplemented with 0.1 mg/1 2,4-D, 0.01 mg/l BAP and 9% mannitol, and in 0.6% agarose rather than in liquid medium. Sensitivity to kanamycin also depended on whether protoplasts were cultured in liquid or agarose medium. Stable transformation of protoplast-derived colonies, as determined by resistance to kanamycin and Southern blot analysis, was achieved by electroporation using both rectangular and exponentially-decaying pulses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716841
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