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  • 2000-2004  (3)
  • 1960-1964
  • 1945-1949
  • 2000  (3)
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  • 2000-2004  (3)
  • 1960-1964
  • 1945-1949
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  • 1
    Electronic Resource
    Electronic Resource
    Electric field dependence of the screening currents in the mixed state of high temperature superconductors investigated by an ac technique (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4749-4753 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of the electric field on the shielding currents of melt textured YBa2Cu3O7−δ superconductors was investigated by low frequency ac magnetization measurements. The electric field was varied by changing the amplitude as well as the frequency of the applied ac field. These two dependencies were found to be consistent with each other and allowed to develop a method for the derivation of the E(J) characteristic of the superconductor from these measurements. E(J) was found to follow approximately a power law with an exponent, which decreases monotonically with increasing magnetic dc field. The results are compared with dc magnetization measurements, where the corresponding electric field is lower by up to four orders of magnitude. We find convincing agreement between the dc shielding currents and their relaxation and the current–voltage characteristic derived from the ac technique. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1308071
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reasons for the decomposition of the fungicide thiram during preparation of fruit and vegetable samples and consequences for residue analysis (2000)
    Springer
    Fresenius' journal of analytical chemistry 366 (2000), S. 851-856 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The concentration of thiram in aqueous solution decreases by 50–75% within 20 min in the presence of cut pieces of apple, cucumber or celeriac with a section surface area of 160 cm2 each. The decomposition rate is predominantly influenced by the section surface area of the cut fruit and vegetable samples. Denaturing reaction conditions (exchange of the solvent water by methanol; boiling of sample material) will significantly slow down the decomposition rate. It was concluded that the thiram decomposition had been caused by enzymes on the section surface of the fruit and vegetable samples. For a specific determination of thiram, a simple rinsing of the intact fruit and vegetable material was appropriate as extraction method. For the screening of thiram residues, the often used Keppel method, which determines CS2 from thiram or dithiocarbamates seems to be applicable even if samples had been coarsely cut, since decomposition of the CS2-forming intermediates is slower than the breakdown of thiram itself. Therefore, specific determination of thiram is necessary only, if maximum residue limits for dithiocarbamates are not adhered to.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051584
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Heat Shock Response is Associated with Protection Against Acute Interstitial Pancreatitis in Rats (2000)
    Springer
    Digestive diseases and sciences 45 (2000), S. 2252-2264 
    Details
    ISSN: 1573-2568
    Keywords: cerulein pancreatitis ; dibutyltin dichloride ; cytoprotection ; heat shock protein ; hyperthermia ; transforming growth factor-β1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We recently reported that hyperthermia induces pancreatic expression of heat shock proteins (HSPs), particularly HSP70 isoforms, and protects against cerulein pancreatitis. We have now studied whether a double hyperthermia amplifies these effects and whether hyperthermia also protects against dibutyltin dichloride (DBTC)-induced pancreatitis. A further aim was to examine whether hyperthermia induces changes in transforming growth factor-β1 (TGF-β1). Following pretreatment without or with a single or double hyperthermia, pancreatitis was induced by application of cerulein or DBTC. Pancreatic HSP and TGF-β1 expression were studied by immunoblotting. Pancreas injury was assessed by light microscopy and serum pancreatic enzyme activity. Hyperthermia as well as DBTC induced HSP72, whereas cerulein did not. A double hyperthermia led to a further increase in HSP72 compared to a single heat stress. In both models, hyperthermia significantly reduced pancreatic injury. Although a double hyperthermia slightly decreased the severity of cerulein pancreatitis compared to a single heat treatment, an improved pancreas protection against DBTC cytotoxicity was not achieved. We also found that hyperthermia induces the expression of TGF-β1. In conclusion, hyperthermia preconditioning exerts protective effects against two pathophysiologically different types of pancreatitis by a mechanism that involves the up-regulation of HSP70 isoforms as well as TGF-β1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026459001195
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    Paper (German National Licenses)
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