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  • 1
    Electronic Resource
    Electronic Resource
    Occurence and regulation of Calvin cycle enzymes in non-autotrophic Beggiatoa strains (1988)
    Springer
    Archives of microbiology 151 (1988), S. 15-19 
    Details
    ISSN: 1432-072X
    Keywords: Begglatoa spp. ; Ribulose-1,5-bisphosphate carboxylase ; Phosphoribulokinase ; Regulation of Calvin-cycle enzymes ; Heterologous gene-probe hybridization ; Non-autotrophic sulfur bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To date only marine strains of the genus Beggiatoa have been proven to have the capacity for lithoautotrophic growth. The two best characterized freshwater strains (B18LD and OH-75-2a) — previously tested with no evidence of autotrophic potential — were reinvestigated in the current study. Heterotrophically grown cells from exponential or early stationary phase showed extremely low ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) activities (0.002–0.2 nmol CO2·mg prot-1 min-1). After acetate limitation terminated growth both strains demonstrated increased RuBisCO activity with a maximum achieved 1–3 days into stationary phase. For a single growth cycle, activity could increase by more than 100-fold (strain OH-75-2a), but the highest activity achieved was less than 5% of that observed in a lithoautotrophic control. Phosphoribulokinase activity was approximately an order of magnitude greater than the corresponding RuBisCO activity and showed a similar pattern of regulation. A gene probe derived from the RuBisCO large subunit gene of Anacystis nidulans hybridized strongly with DNA from strain OH-75-2a and the autotrophic marine control but not with DNA from strain B18LD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00444662
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  • 2
    Electronic Resource
    Electronic Resource
    CYTOPLASMIC INCOMPATIBILITY REACTIONS IN NEUROSPORA CRASSA (1966)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 129 (1966), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1966.tb12901.x
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  • 3
    Electronic Resource
    Electronic Resource
    A method for isolating secular geomagnetic variation from shipboard total field measurements: a test case in the NE Atlantic (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 115 (1993), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In this pilot study we describe a method for extracting the secular variation constituent of the Earth's magnetic field from underway shipboard total intensity magnetic measurements. From a large amount of shipboard data obtained in the NE Atlantic, during the period 1956 to 1988, some 29 000 secular variation values were calculated at cross-over points. These results are then compared with those obtained from the International Geomagnetic Reference Fields (IGRF) in this region. Statistical analysis reveals that the 'shipboard’ values are able to match, and marginally improve upon the IGRF values across the oceans, so long as the determination is made from a sufficiently large data set of observed values. This method thus enables the additional utilization of marine observations in the analysis of secular variation patterns across the oceans, which could lead to a more detailed view of these patterns than has been available before.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1993.tb01200.x
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  • 4
    Electronic Resource
    Electronic Resource
    OPTIMALITY OF INDEPENDENT DECISION-MAKING FOR TWO INDEPENDENT RISK SITUATIONS (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 1 (1970), S. 0 
    Details
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This paper investigates the optimality of making two insurance decisions independently in the expected utility framework, when the two risks under consideration are independent. It is shown that when the disutility function embodies constant risk aversion, independent decision-making is identical to optimal joint decision-making. When the disutility function has strictly decreasing risk aversion, joint decision-making is always not less conservative than independent decision-making, and the opposite holds when the disutility function has strictly increasing risk aversion. Stronger results are obtained for some particular disutility functions. Finally, some implications of these results for empirical research in utility and decision theory are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-5915.1970.tb00764.x
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  • 5
    Electronic Resource
    Electronic Resource
    Pedogenic-phreatic carbonates on a Middle Devonian (Givetian) terrigenous alluvial-deltaic plain, Gilwood Member (Watt Mountain Formation), northcentral Alberta, Canada (1998)
    Oxford UK : Blackwell Science Ltd
    Sedimentology 45 (1998), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In the Muskeg Trough of northcentral Alberta the Gilwood Member contains widespread carbonate deposits that formed within terrigenous mudstone and sandstone hosts. Stratigraphic, depositional and petrographic relationships indicate that these carbonates represent calcretes and dolocretes. Calcretes, observed best with cathodoluminescence, display microcrystalline alpha fabrics, circumgranular cracks, root networks, displacive growth fabrics, elongate channel voids and rare coloform growths with flower spar. Similarly, dolocretes have microcrystalline alpha fabrics, brecciation, gradational contacts with host mudstones, extensive layered nodular horizons and are associated with anhydrite and pyrite. δ13C values range between −7‰ to +1‰ and –6‰ to +3‰ for calcretes and dolocretes, respectively. Oxygen isotopes are more variable and differ with host lithologies. δ18O of calcretes ranges between −11‰ to −8‰ for sandstones and −8‰ to −3‰ for mudstones, whereas δ18O of dolocretes ranges between −3‰ to 1‰ for marine mudstones and −6‰ to −2‰ for pedogenic mudstones. Regional mapping indicates that calcretes thicken towards the deepest parts of the Muskeg Trough. Widespread dolocretes extend beyond the eastern and western limits of Muskeg Trough and are useful marker intervals for regional correlations. Dolocretes of restricted lateral extent are found within gleyed palaeosol mudstones next to calcretized channel sandstones.Calcrete isotopic values are interpreted as indicative of carbonate precipitation from waters with meteoric water input. However, the higher δ18O values in dolocretes are indicative of a contribution from an isotopically heavier source such as seawater. Stratigraphically, calcretes are most common along the western and northern edges of Muskeg Trough; thus, calcrete accumulation was further controlled by meteoric water in-flow from the highland to the west and sluggish groundwater flow in Muskeg Trough. In contrast, regionally widespread dolocrete horizons appear to have formed from mixing of fresh waters derived from the highland to the west and seawaters introduced from the east. Regionally restricted dolocretes which are found next to channel sandstones formed from groundwater out-flow from the permeable channel sandstones which resulted in calcretization in channel proximal mudstones and dolomitization in channel distal mudstones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3091.1998.00192.x
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  • 6
    Electronic Resource
    Electronic Resource
    A role for young leaves in vernalization of cauliflower: I. Analysis of leaf development during curd induction (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 78 (1990), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Growth analysis techniques are used to test the hypothesis that chilling induces curd (flower) initiation in the cauliflower (Brassica oleracea Botrytis L. cv. Perfection) through inhibiting leaf growth, thereby increasing the availability of growth factors to the stem apex and enabling differentiation of the curd. Effects of chilling on leaf growth and curd induction are compared in juvenile and mature, vegetative plants. Chilling at 5°C reduced dry matter accumulation in the total leaf complement by ca 60% in juvenile plants and 40% in mature plants, compared to control plants growth at 20°C. Juvenile plants showed slower rates of leaf initiation than mature plants. Leaf initiation was retarded by chilling in both plant types with the most marked effect seen in the juvenile plants. This was consistent with dry matter availability to the stem apex limiting differentiation more severely in juvenile plants than in mature plants. The rate of dry matter accumulation in existing leaves, however, was faster in juvenile plants than in mature plants at 20°C. Plants that were juvenile during chilling produced an average of 43 leaves below the curd whereas those that were mature produced 25.Dry matter accumulation in younger leaves was more markedly inhibited by chilling than in older leaves. Chilling also reduced the rate at which enlarging leaves became positionally more remote from the stem apex. Possible roles for such leaves in regulating apical development are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1990.tb08715.x
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  • 7
    Electronic Resource
    Electronic Resource
    Endomorphins: Localization, release and action on rat dorsal horn neurons (2000)
    Springer
    Journal of biomedical science 7 (2000), S. 213-220 
    Details
    ISSN: 1423-0127
    Keywords: μ-Opiate receptors ; Excitatory postsynaptic currents ; Inhibitory postsynaptic currents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Endomorphin (Endo) 1 and 2, two tetrapeptides isolated from the bovine and human brain, have been proposed to be the endogenous ligand for the μ-opiate receptor. A multi-disciplinary study was undertaken to address the issues of localization, release and biological action of Endo with respect to the rat dorsal horn. First, immunohistochemical studies showed that Endo-1- or Endo-2-like immunoreactivity (Endo-1- or Endo-2-LI) is selectively expressed in fiber-like elements occupying the superficial layers of the rat dorsal horn, which also exhibit a high level of μ-opiate receptor immunoreactivity. Second, release of immunoreactive Endo-2-like substances (irEndo) from the in vitro rat spinal cords upon electrical stimulation of dorsal root afferent fibers was detected by the immobilized antibody microprobe technique. The site of release corresponded to laminae I and II where the highest density of Endo-2-LI fibers was localized. Lastly, whole-cell patch clamp recordings from substantia gelatinosa (SG) neurons of rat lumbar spinal cord slices revealed two distinct actions of exogenous Endo-1 and Endo-2: (1) depression of excitatory and/or inhibitory postsynaptic potentials evoked by stimulation of dorsal root entry zone, and (2) hyperpolarization of SG neurons. These two effects were prevented by the selective μ-opiate receptor antagonist β-funaltrexamine. The localization of endomorphin-positive fibers in superficial layers of the dorsal horn and the release of irEndo upon stimulation of dorsal root afferents together with the observation that Endo inhibits the activity of SG neurons by interacting with μ-opiate receptors provide additional support of a role of Endo as the endogenous ligand for the μ-opiate receptor in the rat dorsal horn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02255468
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  • 8
    Electronic Resource
    Electronic Resource
    The Evolution of the North-East Atlantic (1971)
    [s.l.] : Nature Publishing Group
    Nature 232 (1971), S. 168-173 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Magnetic data taken over a sixteen year period have been analysed and information on the evolution of the North-East Atlantic has been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/232168a0
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  • 9
    Electronic Resource
    Electronic Resource
    A Fossil Triple Junction in the NE Atlantic West of Biscay (1973)
    [s.l.] : Nature Publishing Group
    Nature 244 (1973), S. 86-88 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Because the aeromagnetic survey extends west only to 10 W, two N-S tracks were run on board MV Researcher in 1971 and RRS Shackleton in 1972 at 12 W and 13 W, respectively, to establish the westwards continuity of the Biscay lineations out into the NE Atlantic. Fig. 1 Magnetic lineations in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/244086a0
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  • 10
    Electronic Resource
    Electronic Resource
    Scientific plans for deep sea drilling (1976)
    [s.l.] : Nature Publishing Group
    Nature 259 (1976), S. 83-86 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Deep Sea Drilling Project is about to launch phase IV of its drilling operations, known as the International Phase of Ocean Drilling (IPOD). Plans for the first year of IPOD are well under way and a preliminary drilling schedule for the first four years has been drawn up. At this stage it is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/259083a0
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