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  • 1
    Electronic Resource
    Electronic Resource
    Photocycloadducts of dimethylmaleic anhydride with unsaturated acids and esters (1988)
    s.l. : American Chemical Society
    The @journal of organic chemistry 53 (1988), S. 2624-2629 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00246a045
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  • 2
    Electronic Resource
    Electronic Resource
    Direct Detection of Solar Neutrinos (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 647 (1991), 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.1749-6632.1991.tb32185.x
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  • 3
    Electronic Resource
    Electronic Resource
    Impedance and modulus spectroscopy of semiconducting BaTiO3 showing positive temperature coefficient of resistance (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3850-3856 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline barium titanate that has been doped to give a positive temperature coefficient of resistance (PTCR) effect is an inhomogeneous material electrically. Analysis of ac impedance data using the complex impedance plane representation gives the dc resistance of PTCR ceramics. By additional use of the complex electric modulus formalism to analyze the same data, the inhomogeneous nature of the ceramics may be probed. This reveals the presence of two, sometimes three elements in the equivalent circuit. Grain-boundary and bulk effects may be distinguished from capacitance data: grain-boundary effects have temperature-independent capacitances, whereas bulk effects show a capacitance maximum at the Curie point and Curie–Weiss behavior above the Curie point. Both grain-boundary and bulk effects appear to contribute to the PTCR effect. These results reveal limitations in current theories of the PTCR effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344049
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  • 4
    Electronic Resource
    Electronic Resource
    Quantifying serum antibody class and subclass responses by enzyme immunoassay in humidifier-related disease (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 21 (1991), S. 0 
    Details
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Antibody activity in the major classes and IgG subclasses against antigens in factory humidifier water was quantified by enzyme immunoassay (EIA) in 88 subjects who were exposed at work to the output from these contaminated humidifiers. Those with work-related symptoms had significantly higher mean titres than those who were symptom free, although values overlapped. The individuals with the highest IgG antibody titres also had the highest titres of IgM and IgA antibody, and these parameters did not discriminate between those with and without symptoms any better than the IgG titre. This was also true for the IgG subclasses where activity was predominantly measured in IgG 1. Quantifying the IgG antibody allowed us to demonstrate a significant correlation with years of work exposure (P〈0.001). There was no significant association between antibody and cigarette smoking, as assessed by smoking history and confirmed objectively by serum cotinine levels. There was a significant correlation with total IgG level (P〈0.001) suggesting that a non-specific immune enhancement may accompany the specific response. The antibody titres were followed up to 3 years after modification of the humidification systems, and during this time symptoms resolved and the antilunK levels progressively fell to undetectable levels. The EIA was adapted to measure antigen at nanogram levels thus providing a rapid test for screening of humidifier water as a technique that may help identify the nature of the antigens involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2222.1991.tb00853.x
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  • 5
    Electronic Resource
    Electronic Resource
    Customer-supplier relations and the diffusion of employee relations changes (1996)
    Bradford : Emerald
    Employee relations 18 (1996), S. 9-19 
    Details
    ISSN: 0142-5455
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Describes the utility of supply chain partnerships as a mechanism for the diffusion of change in employee relations. Uses case study and survey evidence to explain the means by which this can be achieved. Examines data relating to both customer and supplier organizations in the manufacturing sector. Concludes that the customer-supplier relationship can act as an agent of change in human resource management, particularly as they do not need to be artificially created, and can reach "peripheral" as well as "core" firms. Suggests that the local economic development agencies may be able to encourage the formation of networks of organizations in a particular industry and promote the spread of innovations in employee relations in this way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/01425459610110209
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  • 6
    Electronic Resource
    Electronic Resource
    Absence of Shock Hazard with Certain Multigap Spark Circuits (1956)
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 1175-1176 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The experiments to be described were carried out with spark circuits of a type and power-level widely used in spectrographic analysis. In each of the circuits shown, Gx represents the control gap determining the striking voltage, while Gz represents the analysis gap which, for convenience in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1771175a0
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  • 7
    Electronic Resource
    Electronic Resource
    Sporidesmium bakeri and Facial Eczema of Sheep in the Field (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1327-1328 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] At the Manutuke Research Station, Gisborne, a facial eczema research farm of the New Zealand Department of Agriculture, two, 1-acre fields (No. 20 and No. 31), of perennial rye grass, white clover have been closely mown, at 7 14 day intervals, with motor lawn-mowers since the spring flush of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841327b0
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  • 8
    Electronic Resource
    Electronic Resource
    Yeast aging research: recent advances and medical relevance (1999)
    Springer
    Cellular and molecular life sciences 56 (1999), S. 807-816 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Yeast; aging; senescence; helicase; silencing; nucleolus; metabolism; retrograde signaling.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The molecular mechanisms of aging are most fully understood for the budding yeast Saccharomyces cerevisiae. Recent advances in our understanding of aging in this organism have enabled researchers to answer some fundamental questions about the aging process. Is aging due to a multitude of ‘mechanisms’ or can there be a key few? Can we design single-gene mutations that will prolong life? Can we prolong life whilst maintaining health and fecundity? The various contributing factors to yeast longevity, uncovered thus far, fall into three classes: DNA metabolism, heterochromatin, and metabolic activity. However, these separate classes may actually represent different aspects of the same aging mechanism based on genome stability. This review examines the recent advances in our understanding of yeast aging and discusses their relevance, if any, to the human condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050027
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  • 9
    Electronic Resource
    Electronic Resource
    Bias in manta tow surveys of Acanthaster planci (1990)
    Springer
    Coral reefs 9 (1990), S. 155-160 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract To investigate the biases associated with manta tow surveys of Acanthaster planci, counts obtained by manta-towed observers were compared with counts made on SCUBA swims under a limited range of conditions. Five 10 m wide strip transects on different parts of two reefs and with different densities of A. planci were surveyed. On average, 22.7% of starfish counted on SCUBA searches were counted on manta tows over the same transect (SD=12.0%, n=69). This proportion is termed sightability. As sightability decreases with increasing transect width, we estimate that, on average, less than 5% of the A. planci present are counted on routine manta tows which are conducted over transect of undefined width. Multiple regression analysis was used to determine which of 33 variables explained most of the variation in sightability in 10 m wide transects. The most influential variables were the proportion of cryptic starfish and an index of the degree of reef complexity. A regression equation designed to improve estimates of the abundance of A. planci on routine manta tows was developed. However, as it explained only 39% of the variation in sightability, this equation is of limited value in stabilising the negative bias associated with manta tow counts. In view of the variability of this bias, the manta tow technique is not suitable for estimating absolute densities of A. planci. Manta tow surveys are appropriate for identifying gross relative differences between densities of A. planci, and thus for determining broad-scale patterns of abundance. As such, they are a cost-effective method of estimating the geographical extent of A. planci outbreaks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258228
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  • 10
    Electronic Resource
    Electronic Resource
    Chromosomal structure is altered by mutations that suppress or enhance position effect variegation (1990)
    Springer
    Chromosoma 99 (1990), S. 391-400 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We examined the genetic, morphological, and molecular effects of position effect variegation inDrosophila, and the effects of mutations that either suppress [Su(var)] or enhance [E(var)] this phenomenon. All eightSu(var) mutations examined strongly suppress the inactivation of variegating alleles of the genes white [In(l) w m4 ], brown [In (2R)bw VDe2 ] and Stubble [T(2;3)Sb V ]. TheE(var) mutation enhances variegation of these loci. The chromosomal region 3C-E (26 bands) which includes the white locus is usually packaged as heterochromatin in salivary glands of the variegating strainw m4 . Addition of any of theSu(var) mutations restores a more euchromatic morphology to this region. In situ hybridization to polytene chromosomes and DNA blot analyses of gene copy number demonstrate that the DNA of thew + gene is less accessible to its probe in the variegatingw m4 strain than it is in the wildtype or variegation-suppressed strains. Blot analysis of larval salivary gland DNA indicates that the white gene copy number does not vary among the strains. Hence, the differences in binding of thew + gene probe in the variegating and variegation-suppressed strains reflect differences in chromosomal packaging rather than alterations in gene number. The effects of variegation and theSu(var) mutations on chromatin structure were analyzed further by DNAse I digestion and DNA blot hybridization. In contrast to their dramatic effects on chromosomal morphology and gene expression, theSu(var) mutations had negligible effects on nuclease sensitivity of the white gene chromatin. We suggest that the changes in gene expression resulting from position effect variegation and the action of theSu(var) mutations involve alterations in chromosomal packaging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01726690
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