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  • 1
    Electronic Resource
    Electronic Resource
    Comparative tolerance to gas supersaturated water of carp, Cyprinus carpio, and black bullhead, Ictalurus melas, from the U.S.A. and Italy (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 20 (1982), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Supersaturation of surface water with atmospheric gases may result from hydroelectric or thermoelectric power generation and adversely affect aquatic biota. Although the phenomenon has been extensively studied in the northwestern United States, its occurrence is less well documented in Europe. We evaluated the tolerance of carp, Cyprinus carpio, and black bullhead, Ictalurus melas, from Italy to gas supersaturated water and compared our results to data reported in the literature for the same species from the Columbia River, U.S.A. Carp and black bullhead from Italy were more susceptible to gas supersaturation than those from the Columbia River. This may reflect greater adaptation of Columbia River fish due to their historical exposure to supersaturated water resulting from numerous hydroelectric dams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1982.tb03922.x
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  • 2
    Electronic Resource
    Electronic Resource
    Control of Two Major Pathogens on Fresh Poultry Using a Combination Potassum Sorbate/Karbon Dioxide Packaging Treatment (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 49 (1984), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Salmonella enteriditis and Staphylococcus aureus were separately inoculated onto fresh chicken thighs prior to dipping in 0, 1.0, 2.5, or 5.0% potassium sorbate solutions adjusted to pH 6.0. Treated samples were packaged in Nylon/Plexar/Surlyn bags under air, vacuum, 20%, 60%, or 100% CO2 atmospheres and stored at 10°C ± 1.0°C for 10 days. Changes in gaseous headspace composition, sorbate concentrations, surface pH, and microbial numbers were monitored during the storage period. S. enteriditis was more sensitive to potassium sorbate than S. aureus; growth on poultry of the latter organism was more effectively inhibited by exposure to high levels of CO2. Increased concentrations of sorbate dip solutions in combination with higher concentrations of CO2 in the package environment provided a more effective inhibitory system against growth of both pathogens on fresh poultry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1984.tb13691.x
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  • 3
    Electronic Resource
    Electronic Resource
    Electrochemical etching of titanium alloy castings (1984)
    Springer
    Journal of applied electrochemistry 14 (1984), S. 573-585 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract We used an electrochemical method to etch cast binary titanium alloys in an attempt to show their dendritic structures.Studies showed that when an alloy could be activated in either sulphuric, oxalic or fluosilicic acid, its anodic polarization curve had the same general shape and passivation potential for all alloys independent of alloying element or concentration. Consequently, in acid solutions, electrochemical etching was conducted at a constant potential slightly less noble than the passivation potential where the anodic current density was near the maximum. Of the alloys examined, only Ti-15%Cr was etchable in a concentrated caustic solution and etching occurred only in the transpassive potential region. Under our conditions we were able to show the dendritic structure in alloys containing 15%Cr, Ta, or Mo; at lower concentrations, or in the case of the 15%Nb alloy, the dissolution rates of the dendritic and interdendritic materials were too similar to differentiate between them on the etched surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626301
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  • 4
    Electronic Resource
    Electronic Resource
    Measurements of hyperon semileptonic decays at the CERN Super Proton Synchrotron (1982)
    Springer
    The European physical journal 12 (1982), S. 307-321 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The charged hyperon beam at the CERN Super Proton Synchrotron (SPS) has been used to collect data on semileptonic decays ofΣ −,Ξ − andΛ. A magnetic channel selects 100 GeV/c negatively charged particles produced in the forward direction by interaction of the 200 GeV/c SPS proton beam on a BeO target. TheΣ − andΞ − hyperons are concurrently identified in a DISC Čerenkov counter, and their decay products are analysed by a magnetic spectrometer. Electron-hadron discrimination is achieved by the combined use of lead-glass and lead/scintillator counters, transition radiation detectors, and a Čerenkov counter. In this article we report results on the $$\Sigma ^ - \to \Lambda e^ - \bar v$$ decay mode. Measurements of the Λ polarization and of the centre-of-mass distributions (baryon kinetic energy, electron-neutrino correlation, and Dalitz plot distributions) yield the vector to axialvector form factor ratiof 1/g 1=+0.034±0.080, in agreement with the value expected from the conserved vector current hypothesis (f 1/g 1=0). TheΣ −→Λe − v→ branching ratio measurement gives a value of (5.41±0.30)×10−5. The effects of radiative corrections are not included in these results. They are discussed in the text. Results on the otherΞ −,Σ −, andΛ semileptonic decays are reported in separate articles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01557576
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  • 5
    Electronic Resource
    Electronic Resource
    Measurements of hyperon semileptonic decays at the CERN Super Proton Synchrotron (1983)
    Springer
    The European physical journal 21 (1983), S. 27-36 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results on five different hyperon semileptonic decays from the WA2 experiment, performed in the CERN SPS charged hyperon beam, have been analysed within the framework of the Cabibbo model. For the first time, the inconsistencies, which inevitably occur when the results from different experiments are combined, have been avoided in these comprehensive fits to high statistics data from a single hyperon decay experiment. Excellent agreement with the basic Cabibbo model has been obtained using the WA2 data either alone or together with neutron lifetime measurements. These results contrast strongly with other recent Cabibbo analyses which have indicated the presence ofSU(3) breaking effects. Including radiative corrections we have obtained the results,F=0.477±0.012,D=0.756±0.011 and sinθ c =0.231±0.003. The ratio (D/D+F) is 0.613±0.009, which is close to theSU(6) prediction of 3/5. Using additional information onft values for superallowed nuclear Fermi transitions, an upper limit on the mixing parameter sinθ3 in the Kobayashi-Maskawa six quark scheme has been obtained: |sinθ3|〈0.20.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01648773
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  • 6
    Electronic Resource
    Electronic Resource
    Mixing and separation device for continuous flow bioassays with coal liquids (1981)
    Springer
    Bulletin of environmental contamination and toxicology 26 (1981), S. 717-723 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01622161
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of weight loss on serum 1,25-(OH)2-vitamin D concentrations in adults: A preliminary report (1984)
    Springer
    Calcified tissue international 36 (1984), S. 139-144 
    Details
    ISSN: 1432-0827
    Keywords: 1,25(OH)2-vitamin D ; Weight loss ; Phosphate ; Calcium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary During a review of 42 metabolic studies in healthy women and men we observed that serum 1,25-(OH)2-D concentrations were directly correlated to the observed daily changes in body weight (r=0.68;P〈0.001) and to caloric intake/kg/day (r=0.39;P=0.01). These relationships could not be accounted for by related and physiologically expected changes in serum Ca or iPTH concentrations. However, serum 1,25-(OH)2-D concentrations were observed to be inversely correlated to serum PO4 levels (r=−0.44;P=0.004). In addition, serum PO4 levels were inversely correlated to the daily changes in body weight (r=−0.40;P=0.009). Since dietary sodium intake averaged 142 mmol/day, it is unlikely that the observed changes in weight were the result of changes in salt and water balance. Thus it seems reasonable to speculate that serum 1,25-(OH)2-D concentrations may vary directly with energy balance, as reflected by changes in body weight. This effect may be mediated by alterations in PO4 metabolism. The accurate assessment of serum 1,25-(OH)2-D levels thus appears to require several measurements over time periods during which body weight is stable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405309
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of coal liquid water-soluble fractions on growth and survival of four aquatic organisms (1982)
    Springer
    Archives of environmental contamination and toxicology 11 (1982), S. 553-560 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Toxicities of water soluble fractions (WSF) derived from a fresh and a water-leached solvent-refined coal (SRC II) material were compared by observing freshwater organism response to chronic exposure. Concentrations, relative distributions, and loss over time of phenols and aromatic hydrocarbons differed between aqueous extracts derived from fresh and leached SRC II material. Readily water-soluble phenols predominated in initial WSFs; higher molecular weight compounds with relatively lower solubility predominated in leached WSFs. Suppression of growth, reproduction and survival of invertebrates,Chironomus tentans, Tanytarsus dissimilis, andDaphnia magna and the algaeSelenastrum capricornutum, were observed at concentrations ranging from 0.02 to 0.42% of WSFs derived from fresh SRC II liquid and 0.80 to 3.95% of WSFs derived from leached SRC II material. Alga populations were the least sensitive to WSFs generated from the coal liquid. Based on equal concentrations of carbon or phenols, solutions derived from leached SRC II liquids were usually more toxic to test species. Data suggest that tests of potential long-term effects of complex materials must be designed and interpreted on the basis of organism exposure to compounds most likely to persist in the environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01056362
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  • 9
    Electronic Resource
    Electronic Resource
    A stem cell for stem cells in murine haematopoiesis (1982)
    [s.l.] : Nature Publishing Group
    Nature 298 (1982), S. 562-563 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In female mammals, one of the two X chromosomes becomes irreversibly inactivated early in embryogenesis; subsequently any somatic cell and its descendants fail to express genes carried on the inactivated chromosome4'5. X-linked genetic variants can therefore provide markers for cell population ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/298562a0
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  • 10
    Electronic Resource
    Electronic Resource
    Regulation of plasma 1,25-(OH)2-D3 by phosphate: Evidence against a role for total or acid-soluble renal phosphate content (1983)
    Springer
    Calcified tissue international 35 (1983), S. 773-777 
    Details
    ISSN: 1432-0827
    Keywords: 1,25-(OH)2-D3 ; Hypophysectomy ; Growth hormone ; Phosphorus ; 31P NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary In order to evaluate a possible role for tissue phosphate or phosphorylated compounds in mediating the increase in plasma 1,25-(OH)2-D3 levels during dietary phosphate deprivation, measurements of total and acid-soluble renal cortical phosphate content have been made in both intact and hypophysectomized (hypox) rats eating a normal diet and also after four days of dietary phosphate deprivation. Similar measurements were also made in phosphate-deprived hypophysectomized rats replaced with growth hormone (GH). Total and acid-soluble renal cortical phosphate content averaged 81±8 µmol/g and 4.1±0.6 µmol/g, respectively, in intact rats eating the normal diet and were not significantly altered after phosphate deprivation despite a fall in plasma phosphate of about 40% and a fourfold increase in plasma 1,25-(OH)2-D3 levels. Total and acid-soluble renal cortical phosphate content levels were higher in hypox rats, averaging 92±8 µmol/g and 4.9±0.7 µmol/g, respectively, but also did not change after phosphate deprivation. Replacement of phosphate-deprived hypox rats with GH resulted in a further fall in plasma phosphate and a significant increase in plasma 1,25-(OH)2-D3 levels, but there was no change in either total or acid-soluble renal cortical phosphate content. The distribution of organophosphorus compounds in the acid-soluble phosphate fraction in these experiments was also evaluated using31P NMR spectroscopy. Although there appeared to be an increase in the total concentration of organophosphorus compounds after phosphate deprivation, this effect was not altered by hypophysectomy or by replacement of phosphate-deprived hypox rats with GH. These data suggest that unless phosphate deprivation affects only a small or specific cellular phosphate pool, some factor other than renal cell inorganic phosphate content must initiate the increase in renal 1,25-(OH)2-D3 synthesis that occurs during phosphate deprivation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405122
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