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  • 1
    Electronic Resource
    Electronic Resource
    Pathophysiology of Sudden Upper Airway Obstruction in Sleeping Infants and Its Relevance for SIDS (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 533 (1988), 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.1749-6632.1988.tb37261.x
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  • 2
    Electronic Resource
    Electronic Resource
    The propagation of long waves over an undulating bed (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1331-1340 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The propagation of long surface water waves over an undulating bed is governed by a Mathieu equation. Instabilities of solutions of this equation indicate resonant interactions associated with the strong reflection of the surface waves by the bedforms. The strongest interaction occurs when the bed wavenumber (l) is approximately twice the surface wavenumber (k). This interaction is known in solid-state physics as Bragg reflection. In this paper the interaction of incident surface waves with a patch of ripples on an otherwise flat bed is considered. For the general nonresonant case (l≠2k), a perturbation solution of the Mathieu equation is obtained. This solution indicates that the reflection coefficient R, defined as the ratio of the magnitudes of the reflected and incident waves, is both oscillatory in the ratio of the overall length of the ripple patch to the surface wavelength and also resonant in the vicinity of l=2k. The condition of exact resonance (l=2k) is studied separately and the solution obtained predicts that R tends uniformly to unity as the number of ripples (having l=2k) is increased. The present approach is simpler and more readily applicable than the use of previous more complicated methods based on potential theory. It also provides some insight into the higher-order resonant interactions between waves on a free surface and an undulating bed. The results are particularly important in oceanography, in connection with the reflection of incident surface waves by sandbars off beaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857308
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  • 3
    Electronic Resource
    Electronic Resource
    A bimodular representation of ten-dimensional fermions (1986)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 27 (1986), S. 3036-3039 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The fermionic and supersymmetric octonionic bimodular representations are constructed. It is shown that an octonionic formulation of the fermion leads to an intrinsically ten-dimensional world with two independent representations. Consistency conditions for an octonionic supersymmetric algebra are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527232
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  • 4
    Electronic Resource
    Electronic Resource
    Quaternionic methods in integral transforms of geophysical interest (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 99 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: It is well known that the Cauchy integral formula may be used in the study of integral transforms, leading to an elegant formulation in 2-D. We show that the quaternionic analysis of Fueter, and in particular the quaternionic analogue of the Cauchy formula, may be applied to derive integral transforms of vector functions in 3-D in an elegant manner. In particular we show that this result contains as special cases results of interest in the study of integral transforms in geophysics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb02042.x
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  • 5
    Electronic Resource
    Electronic Resource
    Field observations of the threshold of sediment motion by wave action (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 32 (1985), S. 0 
    Details
    ISSN: 1365-3091
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Two field experiments were carried out to determine critical conditions at the threshold of sand motion beneath irregular sea waves. The experiments were performed outside the breaker zone at Blackpool Sands, Start Bay, Devon, in waters of depth 4–10 m. From synchronous video and near-bed velocity records, critical conditions at the threshold of motion have been established in terms of the measured free-stream velocity amplitude. Despite the irregular nature of the (swell) waves and the mixture of grain sizes on the bed, agreement between the present field results and previous laboratory results is reasonable, provided that proper allowance is made for the presence of sand ripples. In order to define threshold motion conditions on a more rational basis than in terms of the free-stream velocity amplitude, calculations of the bottom stress have been made on the basis of laboratory-derived wave drag coefficients. The threshold-motion conditions thus established from the field data are in good agreement with sediment threshold values from Shields' curve derived from laboratory work, at least for cases in which it has been possible to calculate the skin-friction contribution to the total bed shear stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3091.1985.tb00482.x
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  • 6
    Electronic Resource
    Electronic Resource
    Further studies on Zschokkella russelli Tripathi (Myxozoa: Myxosporea) from Ciliata mustela L. (Teleostei; Gadidae), with emphasis on ultrastructural pathology and sporogenesis (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 11 (1988), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract In this second study of the myxozoan Zschokkella russelli Tripathi from Wales, infection occurred in 71-0% of five-bearded rocklings, Ciliata mustela L.; all infected fish were mature and immature fish were uninfected. Histologieal studies showed ehanges to gallbladder and liver that mostly conformed with earher findings, but sinusoidal dilation, which had not been seen previously, was present in three of 22 infected livers. Thickening around hepatic ducts was shown by transmission electron microscopy (TEM) to comprise fibroblasts and associated collagen bundles, while the attenuated epithelium of hepatic ducts bore few mierovilli. Zschokkella russelli plasmodia were seen by TEM to have fine tubular structures, particularly adjacent to developing sporonts. Spores showed long extensions to the sporoplasm, while spore valves had up to 18 surface ridges each and depressions between ridges were supported by microtubules. Otherwise, in its general ultrastructure and sporogenesis Z. russelli resembled other myxosporida.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1988.tb01228.x
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  • 7
    Electronic Resource
    Electronic Resource
    Conjugal transfer of a small plasmid from Bacillus subtilis to Clostridium acetobutylicum by cointegrate formation with plasmid pAMβ1 (1987)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 42 (1987), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Plasmid pAMβ1 is transferred at low efficiency in filter matings between Bacillus subtilis and Clostridium acetobutylicum. We have constructed a small non-conjugative plasmid, pOD1 (7.2 kbp; ApR, CmR, EmR) that becomes established in pAMβ1-containing strains of B. subtilis in the form of a cointegrate (pAMβ1::pOD1). The cointegrate plasmid is transferred to, and maintained in C. acetobutylicum, with an efficiency similar to that of pAMβ1. We have also constructed derivatives of plasmid pOD1, with single sites for several commonly used restriction endonucleases. They can be used to transfer foreign genes to C. acetobutylicum via B. subtilis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02056.x
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  • 8
    Electronic Resource
    Electronic Resource
    Uptake of 14C-chlorhexidine diacetate to Escherichia coli and Pseudomonas aeruginosa and its release by azolectin (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 60 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Uptake of 14C-labelled chlorhexidine diacetate (14C-CHA) by wild-type and envelope mutant strains of Escherichia coli and Pseudomonas aeruginosa was very rapid. Maximum uptake was observed within a contact time of 20 s with no additional binding on increased contact, and was concentration-dependent. In contrast to this rapid binding of 14C-CHA, bactericidal studies revealed that the lethal activity of low concentrations of unlabelled CHA was slow, although higher concentrations had a rapid effect. Comparison of a wild-type strain with its envelope mutants indicated that there was little difference in 14C-CHA uptake, in minimal inhibitory concentrations or in bactericidal activity. Azolectin was found to be an effective neutralising agent of biguanide action, but in in vitro agar tests and in reducing or removing the amount of 14C-CHA taken up by the cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03495.x
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  • 9
    Electronic Resource
    Electronic Resource
    Improved estimates of statistical regularization parameters in fourier differentiation and smoothing (1986)
    Springer
    Numerische Mathematik 48 (1986), S. 671-697 
    Details
    ISSN: 0945-3245
    Keywords: AMS (MOS): 65D25 ; 65D10 ; CR: G1.2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We investigate the statistical methods of cross-validation (CV) and maximum-likelihood (ML) for estimating optimal regularization parameters in the numerical differentiation and smoothing of non-exact data. Various criteria for optimality are examined, and the (asymptotic) notions of strong optimality, weak optimality and suboptimality are introduced relative to these criteria. By restricting attention to certainN-dimensional Hilbert spaces of smooth and stochastic functions, whereN is the number of data, we give regularity conditions on the data under which λCV, the regularization parameter predicted by CV, is strongly optimal with respect to the predictive mean-square signal error. We show that λML is at best weakly optimal with respect to this criterion but is strongly optimal with respect to the innovation variance of the data. For numerical differentiation, λCV and λML are both shown to be suboptimal with respect to the predictive mean-square derivative error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01399688
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  • 10
    Electronic Resource
    Electronic Resource
    Association of phosphorylation of the T3 antigen with immune activation of T lymphocytes (1987)
    [s.l.] : Nature Publishing Group
    Nature 325 (1987), S. 540-542 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To explore whether T3 phosphorylation accompanies poly-clonal T-cell activation, T3 immunoprecipitates were prepared from 32P-labelled quiescent peripheral blood T cells that had been exposed to the lectin PHA. There were no T3 phosphory lated polypeptides in untreated cells (Fig. 1, track 1). In ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/325540a0
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