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  • Wiley  (38)
  • Blackwell Publishing Ltd  (11)
  • Oxford University Press  (9)
  • American Geophysical Union  (4)
  • Molecular Diversity Preservation International (MDPI)
  • Nature Publishing Group
  • 2020-2022
  • 1985-1989  (63)
  • 1989  (63)
Collection
Publisher
Years
  • 2020-2022
  • 1985-1989  (63)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Comparison of Ribosomal and Isozymic Phylogenies of Tetrahymenine Ciliates (1989)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 36 (1989), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A recent analysis of sequence variations in ribosomal RNA's from 31 species of tetrahymenine ciliates groups them into 9 sets referred to as “ribosets.” These species associations are not well correlated with the distributions of distinctive morphological characteristics. The phylogenetic structure suggests that modem “pyriform” tetrahymenines may be paraphyletic survivors of primitive design and that the morphologically distinctive forms may include examples of convergent evolution of derived forms. Alternatively, the common ancestor may have been a polymorphic species that has lost its plasticity in some derived lineages. In an attempt to test the ribosomal phylogeny, we here compare it with a phytogeny based on isozymic variation. The main features of the ribosomal and isozymic phylogenies are similar. The carnivorous (macrostome-forming) species are widely scattered in both, as are the bacteriophagous pyriform species. Isozymic and ribosomal analyses are optimally useful, however, in different contexts. Isozymic variations can distinguish species that are ribosomally identical. Ribosomal variations provide more secure evaluations of distant relationships.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1989.tb02661.x
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  • 2
    Electronic Resource
    Electronic Resource
    Identification of the cAMP-Specific Phosphorylation Site of the Purified Skeletal Muscle Receptor for Calcium-Channel Blockers (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 560 (1989), 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.1749-6632.1989.tb24119.x
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  • 3
    Electronic Resource
    Electronic Resource
    Open Problem B Are the Hodel and Mrowka Metrization Numbers Equal? (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 552 (1989), 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.1749-6632.1989.tb22399.x
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  • 4
    Electronic Resource
    Electronic Resource
    Broomrape control in faba bean (Vicia faba L.) with glyphosate and imazaquin (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 29 (1989), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Field studies were carried out to evaluate the efficacy of imazaquin and glyphosate in controlling broomrape (Orobanche crenata Forsk. and O. aegyptiaca Pers.) in faba bean (Vicia faba L.) in Northern Syria. Several rates and times of application of the herbicides were tested. Nearly complete control of broomrape was achieved with both the herbicides when they were sprayed twice (when the broomrape attachments to the faba bean roots were at tubercle stage of develoment and 15 days later) at a rate of application of 80 g a.i. ha−1 for glyphosate and 10 g a.i. ha−1 for imazaquin.However, the yield of faba bean did not increase with these treatments, suggesting that the herbicides at these rates were still causing some physiological disorder in the plant that counteracted the beneficial effect of broomrape control on the performance of faba bean plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1989.tb00846.x
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  • 5
    Electronic Resource
    Electronic Resource
    The Geomagnetic Spectrum For 1980 and Core-Crustal Separation (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 97 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The spectrum of a high degree spherical harmonic model of the geomagnetic field is analysed to compute the constants for the core and crustal field contributions. Using a noise estimate of 0.091 nT2 at the mean Magsat radius of 6791 km, the power reduced to the Earth's surface is found to be 9.66 times 108 (0.286)n nT2 for the core, and 19.1 (0.996)n nT2 for the crust. These values show half the crustal power extrapolated to n = 0 compared with a previously published n = 23 model, and a white noise depth of only 14km below the mean surface. the core spectrum power is 30 per cent less than previously estimated and becomes flat 80 km below the core-mantle boundary. the crustal power level is an eighth of that of an estimate based on one-dimensional analyses of Project MAGNET survey lines. the point where the energy density of the core and crustal components become equal at the Earth's surface is n = 14.2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb00514.x
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  • 6
    Electronic Resource
    Electronic Resource
    Modelling the Earth's Geomagnetic Field to High Degree and Order (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 97 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: We present a method for modelling the Earth's magnetic field to very high degree and order in terms of spherical harmonics. the method exploits the orthogonality of the spherical functions, using, in part, the method of Gauss-Legendre quadrature. This method is compared to a simpler quadrature method (Newton-Cotes). We show that the Gauss-Legendre technique is more accurate in most cases than Newton-Cotes quadrature, and in all cases, even where the two give about the same results, that the Gauss-Legendre method is more efficient in that it requires less data and hence less computation. the two quadrature methods are applied to sets of radial field data computed from an n= 29 model which simulate Magsat observations. the results are that direct integration of a complete global coverage of observations using Newton-Cotes produces errors in the spatial spectrum comparable to that of the geomagnetic field at n= 9, whereas Gauss-Legendre gives exact recovery. When 7° of polar region data are removed to simulate the Magsat orbit, both methods fail, although Gauss-Legendre gives somewhat less noisy results. However, when the analysis is performed on residuals to a field truncated at n= 15, both methods give comparable levels of noise. Simple interpolation of data over the pole is seen to reduce the errors significantly beyond n= 50. Addition of synthetic noise is seen to provide a means of evaluating the accuracy of coefficients derived from actual data. A theoretical relation is derived relating this noise and the altitude of observation to the resulting errors in the spatial spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb00512.x
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  • 7
    Electronic Resource
    Electronic Resource
    INACTIVATION OF GIARDIA MURIS CYSTS BY CHLORAMINES (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 25 (1989), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : In a study to measure the efficacy of chioramines at inactivating Giardia cysts, the ability of cysts to excyst was measured after exposure to different concentrations of chloramines, for different times, and at different temperatures and pH. The chloramines were generated by mixing ammonium sulfate and sodium hypochlorate in water to approximate a 7:1 chlorine:ammonia ratio by weight. Times of 40, 80, 180, and 270 minutes; temperatures of 3, 10, and 18°C; target chioramine concentrations of 0.4, 1.4, 2.0, and 2.6 mg/L; and pH of 7.0 and 8.5 were the actual values tested. The combinations of these variables that were able to inactivate 〉99.8 percent of the cysts were a minimum chloramine concentration of 2.26 mg/L applied for 270 minutes at a water temperature of 10°C; and at 18°C, averaged minimum chloramine concentrations of 2.14 and 1.55 mg/L applied for 180 and 270 minutes, respectively. The minimum CT values corresponding to these combinations capable of 〉99.8 percent cyst inactivation, are 610 at 10°C and 385 at 18°C. Temperature was noted to exert a major effect on the ability of chloramines to inactivate cysts. Modifications of the methods used to generate chloramines may have an effect on the capacity of this disinfectant to inactivate cysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1989.tb03069.x
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  • 8
    Electronic Resource
    Electronic Resource
    INSTRUMENTAL DETERMINATION OF INDIUM IN GEOCHEMICAL REFERENCE SAMPLES BY EPICADMIUM NEUTRON ACTIVATION ANALYSIS AND KO -STANDARDIZATION (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 13 (1989), S. 0 
    Details
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The determination of indium in geological materials is difficult by usual analytical techniques because of their lack of sensitivity. Neutron activation analysis with special irradiation and counting conditions allows to determine indium ultra-traces with a quantitative detection limit about a few parts per billion. The method developed is fast and very sensitive and has been tested successfully for several American and French geochemical standards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-908X.1989.tb00468.x
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  • 9
    Electronic Resource
    Electronic Resource
    Global R&D management (1989)
    Oxford, UK : Blackwell Publishing Ltd
    R & D management 19 (1989), S. 0 
    Details
    ISSN: 1467-9310
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: AbstractGlobal R&D management, the management of company R&D effort distributed over different countries, a task that concerns multinational firms, has not been widely studied. The authors have therefore carried out in-depth studies of global R&D conducted by 7 European and 15 Japanese companies. Their objective was to identify ‘best practice’ and so construct a framework for future research.The authors' conclusions are as follows. Globalisation, that is decentralisation of R&D, has become a necessity for multinationals as a result of the localisation of competition, of product life becoming shorter than development time, and the need to locate laboratories near sources of new technological know-how.Because foreign acquisitions often lead to the acquisition of laboratories, questions are raised about how best to integrate them with the administrative practices of the ‘home’ organization, whether to reorganize them or to close them down. When it is necessary to set up a new foreign-based laboratory deciding its exact location will require the weighing of factors such as whether the activities are to be market or process oriented, where on the R to D scale the activities will be placed, and how far direction of the laboratory's programmes and work will be decentralised.Global management also demands special attention to the building of an open communication network among the laboratories, the best form of which has yet to be determined. The main concern in human resource management will be how to select and develop an internationally oriented management corps and how to train R&D professionals to communicate across sites.If globally dispersed R&D laboratories are to be most effectively used then a new framework for their management needs to be developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-9310.1989.tb00634.x
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  • 10
    Electronic Resource
    Electronic Resource
    Genes coding for Shiga-like toxin and heat-stabile enterotoxin in porcine strains of Escherichia coli (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 58 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Besides diarrheagenic enterotoxigenic Escherichia coli (ETEC) that produce classical heat stable and/or heat labile enterotoxins (STs, LTs) and the class of Shiga-like toxin-producing enterohemorrhagic E. coli (EHEC), a new category of E. coli is defined sharing similarities with ETEC and EHEC. DNA hybridization studies indicate that some E. coli serovars from porcine origin harbor genes encoding cytotonic ST and cytotoxic Shiga-like toxin. The presence of two potent toxins might contribute to the virulence of such strains and should be taken into consideration when bioassays are performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03029.x
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