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  • 1
    Electronic Resource
    Electronic Resource
    Sialic acid-containing lipopolysaccharides in purple nonsulfur bacteria (1988)
    Springer
    Archives of microbiology 150 (1988), S. 584-589 
    Details
    ISSN: 1432-072X
    Keywords: Lipopolysaccharide ; Sialic acids ; Core region ; Purple nonsulfur bacteria ; N-Acetylneuraminic acid ; Rhodobacter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lipopolysaccharides (LPS) from a number of purple nonsulfur bacteria and of phylogenetically related species were analyzed for the presence of sialic acid by gas chromatography/mass spectrometry. Species and strains of the genera Rhodobacter, Rhodopseudomonas, Rhodomicrobium, Rhodospirillum, Rhodocyclus and Rhodopila were investigated, sialic acid, however, was found only in the genus Rhodobacter. It occurs in strains of Rhodobacter capsulatus, R. sphaeroides, R. sulfidophilus and R. veldkampii. All these species belong to the α-3 subgroup of purple bacteria as defined by 16S rRNA catalogues. Approximately equimolar ratios of sialic acid and of 2-keto-3-deoxy-octonate (KDO) were found in isolated LPSs. Sodium deoxycholate gel electrophoresis of these LPS-samples also suggested a location of sialic acid in the LPS “core” region. Sialic acid was present only in those LPSs, which exhibited a “complete core region”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408254
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  • 2
    Electronic Resource
    Electronic Resource
    Lipid A with 2,3-diamino-2,3-dideoxy-glucose in lipopolysaccharides from slow-growing members of Rhizobiaceae and from “Pseudomonas carboxydovorans” (1989)
    Springer
    Archives of microbiology 151 (1989), S. 111-116 
    Details
    ISSN: 1432-072X
    Keywords: Lipid A ; 2,3-Diamino-2,3-dideoxy-glucose ; Slow-growing rhizobia ; Fast growing rhizobia ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lipid A's from two Bradyrhizobium species and from the phylogenetically closely related species “Pseudomonas carboxydovorans” were found to contain 2,3-diamino-2,3-dideoxy-glucose as lipid A backbone sugar. In contrast, three representatives of the genus Rhizobium, as well as the phylogenetically related species Agrobacterium tumefaciens, contain solely glucosamine as lipid A backbone sugar. These findings suppor independent studies on the phylogenetical relatedness based on 16S rRNA-data of the genus Bradyrhizobium with “Pseudomonas carboxydovorans“ and Rhodopseudomonas palustris, which form a tight phylogenetical cluster and which all contain the 2,3-diamino-2,3-dideoxy-glucose-containing lipid A. The relatedness of these species to the glucosamine-containing species of the genus Rhizobium and to Agrobacterium tumefaciens is rather distant as documented by 16S rRNA studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414423
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  • 3
    Electronic Resource
    Electronic Resource
    Structural relationship between the polyagglutinable antigen and the core polysaccharide of Pseudomonas aeruginosa (1988)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 47 (1988), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract It has been observed that each strain of the Pseudomonas aeruginosa species harbours the so-called polyagglutinable antigen (PA). Some strains may produce it in a form which is linked to the core moiety of lipopolysaccharide (LPS) and this type of PA can thus be detected by passive haemagglutination using the isolated LPS as coating antigen. Other strains synthesize PA exclusively in a free form, which is also coextractable with LPS, its presence can, however, be demonstrated by the haemagglutination inhibition test. From a polyagglutinable strain of P. aeruginosa an R-type LPS was isolated having the core-linked PA. This LPS preparation was highly immunogenic with regard to its PA moiety. The core-bound PA seems to exert an immunosuppression on the core region, hence, the polyagglutinable strains isolated from cystic fibrosis patients only engender anti-PA antibodies, whereas antibodies against both, side chain and core region of LPS, are not engendered. The mucoid exopolysacharides also contains the PA which could possibly play an important role in the patient by protecting P. aeruginosa cells against anti-PA antibodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1988.tb02497.x
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  • 4
    Electronic Resource
    Electronic Resource
    Electro-optical examination of the band structure of ordered InGaAs (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 88-90 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using electroabsorption measurements, we have studied the effects of atomic superlattice ordering on the electronic band structure of InGaAs for different growth parameters. We have observed ordering-induced polarization anisotropy, valence-band splitting and band gap reduction strongest for 550 °C growth and 2°[111]B tilted substrates. Back-folded conduction-band states show an ordering dependent energy shift. The position of the split-off valence-band, however, is almost unaffected. An extension to extremely low growth temperatures exhibits ordering also for 450 °C growth. Atomic force microscopy measurements reveal a temperature-dependent change of InGaAs surface from step-like to island formation. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125665
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  • 5
    Electronic Resource
    Electronic Resource
    Polarization in elastic nucleon-deuteron scattering
    Amsterdam : Elsevier
    Physics Letters B 31 (1970), S. 263-265 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(70)90165-6
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  • 6
    Electronic Resource
    Electronic Resource
    FCC policy research
    Amsterdam : Elsevier
    Telecommunications Policy 2 (1978), S. 65-68 
    Details
    ISSN: 0308-5961
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0308-5961(78)90067-8
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  • 7
    Electronic Resource
    Electronic Resource
    Privacy protection study
    Amsterdam : Elsevier
    Telecommunications Policy 2 (1978), S. 60-65 
    Details
    ISSN: 0308-5961
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0308-5961(78)90066-6
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  • 8
    Electronic Resource
    Electronic Resource
    Eine neue Methode zur Trennung von Kupfer und Quecksilber (1927)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 72 (1927), S. 441-442 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01376722
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  • 9
    Electronic Resource
    Electronic Resource
    TPEPICO studies near ionization threshold of argon and krypton clusters (1991)
    Springer
    The European physical journal 20 (1991), S. 29-32 
    Details
    ISSN: 1434-6079
    Keywords: 36.40. + d ; 82.50.Fv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Single photon ionization of argon and krypton clusters has been studied in the region between threshold and the ionization potential of the corresponding atom. Synchrotron radiation from the electron storage ring BESSY is used to ionize the clusters; threshold-photo-electron-photoion-coincidence (TPEPICO)-time-of-flight technique is used to detect ions correlated with the emission of zero-kinetic-energy-electrons. The spectra of the clusters in the range ofn=2 to 15 are discussed in view of the extensive fragmentation taking place in these systems. In order to characterize the properties of the clusters a method using scaling laws is applied. The principles and the deduction of Hagena's scaling parameter Γ* are briefly reviewed. Using Γ* an experimentally derived mean cluster size for molecular beams can be assigned. This allows one to clearly demonstrate the systematic variations of the measured spectra due to cluster fragmentation. As a general feature it is observed that, in the range studied, the peak in the measured ionization rate for a cluster ion (fragment) of a given size shifts to higher photon energies as the mean cluster size is increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01543930
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  • 10
    Electronic Resource
    Electronic Resource
    Photoionisation studies of homogeneous argon and krypton clusters using TPEPICO (1989)
    Springer
    The European physical journal 14 (1989), S. 339-351 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 35.20.V ; 33.80.E
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The photoionisation threshold region of homogeneous Argon and Krypton clusters Ar n and Kr n forn up to 24 formed in a free jet expansion has been studied in detail, using the threshold photoelectron photoion coincidence (TPEPICO) time of flight technique. Measurements performed at a variety of different expansion conditions (nozzle temperature and stagnation pressure) demonstrate that fragmentation of larger clusters contributes substantially to the shape of the TPEPICO spectra even for the smallest clusters and at all photon energies higher than about 200 meV to 400 meV above the ionisation threshold. The determination of ionisation potentials for these cluster ions is discussed and careful estimates are given and compared with recent theoretical values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429284
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