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  • 1
    Electronic Resource
    Electronic Resource
    Reaction Between Copper Nitrate Hydrate and Methoxydimethyloctylsilane in Methanol (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 1123-1138 
    Details
    ISSN: 1572-8927
    Keywords: Sol–gel processing ; hydrolysis ; condensation ; kinetics ; methoxydimethyloctylsilane ; copper nitrate hydrate ; phase diagram
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction rate was determined for copper nitrate hydrate with methoxydimethyloctylsilane (MDOS) in methanol. The rate constants of hydrolysis and condensation were established by quantitative measurement of the product and Karl Fischer water determination. The reaction with the hydrated copper salt resulted in the phase separation of an insoluble product from the reaction mixture. The structure of the product was determined, by Fourier Transform Infrared Spectrometry (FTIR) and Nuclear Magnetic Resonance (NMR) to be a dimer of the MDOS. The results showed the alcohol, producing condensation reaction was negligible in the formation of the dimer. contrary to the case for the well-known reaction by trialkoxysilanes and tetraalkoxysilanes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022662017881
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution of genetic diversity in relation to chromosomal inversions in the malaria mosquito Anopheles gambiae (1995)
    Springer
    Journal of molecular evolution 40 (1995), S. 578-584 
    Details
    ISSN: 1432-1432
    Keywords: Nucleotide diversity ; Inversion evolution ; Linked gene complex ; Hitchhiking ; Selective sweep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The epidemiology of malaria in Africa is complicated by the fact that its principal vector, the mosquito Anopheles gambiae, constitutes a complex of six sibling species. Each species is characterized by a unique array of paracentric inversions, as deduced by karyotypic analysis. In addition, most of the species carry a number of polymorphic inversions. In order to develop an understanding of the evolutionary histories of different parts of the genome, we compared the genetic variation of areas inside and outside inversions in two distinct inversion karyotypes of A. gambiae. Thirty-five cDNA clones were mapped on the five arms of the A. gambiae chromosomes with divisional probes. Sixteen of these clones, localized both inside and outside inversions of chromosome 2, were used as probes in order to determine the nucleotide diversity of different parts of the genome in the two inversion karyotypes. We observed that the sequence diversity inside the inversion is more than threefold lower than in areas outside the inversion and that the degree of divergence increases gradually at loci at increasing distance from the inversion. To interpret the data we present a selectionist and a stochastic model, both of which point to a relatively recent origin of the studied inversion and may suggest differences between the evolutionary history of inversions in Anopheles and Drosophila species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160504
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  • 3
    Electronic Resource
    Electronic Resource
    Regeneration of shoots from cell suspension-derived protoplasts ofAllium cepa (1995)
    Springer
    Plant cell reports 15 (1995), S. 8-11 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Callus from pre-selected regenerating lines ofAllium cepa andA. fistulosum were used to initiate cell suspensions. Small clusters of callus selected for greater friability were placed into BDS liquid medium containing 2,4-dichlorophenoxyacetic acid (2,4-D) and 6-benzylaminopurine (BA), and were subcultured biweekly. Rapidly growing, finely dispersed lines were used for protoplast isolation. The highest yields came from 3–4 month old cell suspension lines. Protoplasts were cultured in modified K8P liquid medium. Microcalli recovery depended on the number of weeks the cell suspension had been in culture with highest recovery from 4–5 month old cell suspensions. Microcalli were moved to semisolid media when they were approximately 2 mm in diameter. After 4–6 weeks, embryogenic calli thus recovered were moved to variations of standard onion regeneration media containing picloram and BA. Elongating shoots were obtained from up to 88 % of the microcalli of one line, and 40–50 % of the shoots were further multiplied in culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01690243
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  • 4
    Electronic Resource
    Electronic Resource
    Polymeric materials (1996)
    Springer
    Journal of computer-aided materials design 3 (1996), S. 49-55 
    Details
    ISSN: 1573-4900
    Keywords: Polymer ; Composites ; Industry ; Academia ; Modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The Polymer Section of the Santa Barbara Workshop on Modeling of Materials is briefly reviewed. Motivation and need for modeling in polymer-based materials are outlined and the recommendations resulting from the workshop reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185635
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  • 5
    Electronic Resource
    Electronic Resource
    Comparison of the structure of human recombinant short form stromelysin by multidimensional heteronuclear NMR and X-ray crystallography (1996)
    Springer
    Journal of biomolecular NMR 7 (1996), S. 8-28 
    Details
    ISSN: 1573-5001
    Keywords: Stromelysin-1 ; MMP-3 ; Metalloprotease ; Protein structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Stromelysin-1 is a matrix metalloprotease that has been implicated in a number of degenerative diseases. Here we present the refined NMR solution structure of the catalytic domain of stromelysin-1 complexed with a small inhibitor and compare it to the X-ray crystal structure of the same complex. The structures are similar in global fold and show an unusual bottomless S1' subsite. There are differences, however, in the least well defined regions, Phe83-Ile89, His224-Phe232 and Pro249-Pro250, reflecting the lack of NOE data and large B-factors. The region His224-Phe232 contains residues of the Sl' subsite and, consequently, small differences are observed in this subsite. Hydrogen-bond data show that, in contrast to the crystal structure, the solution structure lacks a hydrogen bond between the amide of Tyr223 and the carbonyl of the P3' residue. Analysis of bound water shows two tightly bound water molecules both in the solution and the crystal structure; neither of these waters are in the inhibitor binding site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190453
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  • 6
    Electronic Resource
    Electronic Resource
    CD14 and apoptosis (1999)
    Springer
    Apoptosis 4 (1999), S. 11-20 
    Details
    ISSN: 1573-675X
    Keywords: Adhesion ; inflammation ; lipopolysaccharide ; macrophage ; phagocytosis ; signalling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In addition to its role as a mediator of innate pro-inflammatory responses following bacterial lipopolysaccharide (LPS) binding, the 55kDa glycosyl-phosphatidylinositol-linked macrophage plasma membrane glycoprotein CD14 is now also known to play a role in phagocytic clearance of apoptotic cells. Although apoptotic cell-associated ligand(s) for CD14 await definition, initial findings suggest that ligand binding occurs close to, or at the same site as, LPS binding. Significantly, in contrast to LPS clearance and in keeping with the non-phlogistic nature of apoptosis, CD14-dependent engulfment of apoptotic cells fails to elicit pro-inflammatory cytokine release from macrophages. Therefore CD14 may be regarded as an innate immune receptor both for microbial products—after binding which activates inflammatory responses—and for self components, which either fail to induce, or alternatively actively suppress, inflammatory responses. Here we review current knowledge of the structure and functions of CD14, its ligands, its possible modes of signal transduction and its place in the panoply of macrophage molecules implicated in apoptotic-cell clearance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009673914340
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  • 7
    Electronic Resource
    Electronic Resource
    Analytical atomic spectroscopy using ion trap devices (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 355 (1996), S. 487-493 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Investigations using ion trap devices for analytical atomic spectroscopy purposes have focused on the use of an inductively coupled plasma (ICP) ion source with ion trap mass spectrometric (ITMS) detection. Initial studies were conducted with an instrument assembled by simply appending an ion trap as the detector to a fairly conventional ICP/MS instrument, i.e. leaving an intermediate linear quadrupole between the plasma source and the ion trap. The principal advantages found with this system include the destruction of nearly all problematic and typical ICP/MS polyatomic ions (e.g., ArH+, ArO+, ArCl+, Ar2 +, etc) and a dramatic reduction of the primary plasma source ion, Ar+. These results prompted the development of a second-generation plasma source ion trap instrument in which direct coupling of the ICP and ion trap has been effected (i.e. no intermediate linear quadrupole); the same performance benefits have been largely preserved. Initial operation of this instrument is described, characterized, and compared to the originally described ICP/ITMS and conventional ICP/MS systems. In addition, experiments aimed at improving ICP/ITMS sensitivity and selectivity using broadband resonance excitation techniques are described. Finally, the potential for laser optical detection of trapped ions for analytical purposes is speculated upon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663550487
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  • 8
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    Analytical atomic spectroscopy using ion trap devices (1996)
    Springer
    Details
    Publication Date: 1996-06-01
    Print ISSN: 1618-2642
    Electronic ISSN: 1618-2650
    Topics: Chemistry and Pharmacology
    Published by Springer
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  • 9
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    Optical absorption in the phase-modulated antiferromagnetic state of at-t’-Jmodel (1995)
    American Physical Society
    Details
    Publication Date: 1995-02-01
    Print ISSN: 0163-1829
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society
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