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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of Voltage-Sensitive Dyes for Long-Term Recording of Neural Activity in the Hippocampus (1999)
    Springer
    The journal of membrane biology 172 (1999), S. 145-157 
    Details
    ISSN: 1432-1424
    Keywords: Key words: Optical recording — Voltage-sensitive dye — Dye screening — Merocyanine-rhodanine — Hippocampal slice — Long-term potentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract. We searched for an optimal voltage-sensitive dye for optical measurements of neural activity in the hippocampal slice by evaluating several merocyanine-rhodanine and oxonol dyes. The wavelength dependence (action spectra), pharmacological effects of staining, signal size, signal-to-noise ratio, and the utility of the dyes for long-term continuous recording were examined for four merocyanine-rhodanine dyes (NK2761, NK2776, NK3224 and NK3225), which had been reported to be optimal in embryonic nervous systems, and for two oxonol dyes (NK3630 (RH482) and NK3041 (RH155)), which have been among the most popular potentiometric probes for the hippocampal slice preparation. NK2761, NK3224 and NK3225 provided large signal-to-noise ratios, and proved to be useful for optical recordings lasting several hours. NK3630 was most suitable for long-term recording, although the signal-to-noise ratio was slightly inferior to that of the merocyanine-rhodanines. Using NK3630 (RH482) on the hippocampal slice preparation, we demonstrate here that long-term potentiation can be monitored stably for more than 8 hr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002329900592
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mutagenicity of naphthoquinones in Ames Salmonella tester strains
    Amsterdam : Elsevier
    Mutation Research/Environmental Mutagenesis and Related Subjects 292 (1993), S. 264-265 
    Details
    ISSN: 0165-1161
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-1161(93)90041-W
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dimethyl sulfoxide (DMSO) is mutagenic for bacterial mutagenicity tester strains
    Amsterdam : Elsevier
    Mutation Research Letters 303 (1993), S. 127-133 
    Details
    ISSN: 0165-7992
    Keywords: Dimethyl sulfoxide, mutagenicity ; Escherichia coli ; Salmonella typhimurium
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-7992(93)90025-Q
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Liquid viscosities and densities of HFC-134a+glycol mixtures (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 45-53 
    Details
    ISSN: 1572-9567
    Keywords: density ; diethylene glycol ; ethylene glycol ; HFC-134a ; polyethylene glycol ; polypropylene glycol ; tetraethylene glycol ; triethylene glycol ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Liquid viscosity and density of six binary mixtures of HFC-134a with glycols [ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (400), and polypropylene glycol (2000)] have been measured in the temperature range from 273 to 333 K. The viscosity was measured by a rolling-ball viscometer calibrated with standard liquids of viscosities and densities (JS5, JS10, JS20, and JS50). The density was measured with a glass pycnometer. The uncertainties of the measurements were estimated to be less than 3.4 % for viscosity and 0.04 % for density, respectively. An equation is given to represent the obtained viscosity values as a function of weight fraction and temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00522660
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  • 5
    Electronic Resource
    Electronic Resource
    Revised viscosities for HFC-134a + glycol mixtures from 273 to 333 K (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 109-115 
    Details
    ISSN: 1572-9567
    Keywords: ethylene glycol ; diethylene glycol ; HFC-134x ; polyethylene glycol(400) ; polypropylene glycol(2000) ; tetraethylene glycol ; triethylene glycol ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The liquid viscosity of six binary mixtures of HFC-134a with glycols [ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol(400), and polypropylene glyco](2000)] was measured in the temperature range from 273 to 333 K. The viscosity was measured with an improved capillary viscometer instead of the rolling-ball viscometer reported in our previous work. The measurement uncertainty was estimated to be 1.6%. Most of the present data are higher than previous data, and the gap between the two sets of data increases further in low-viscosity regions. The present results obtained with laminar flow are more reliable than previous results, which are indefinite because of the limit of usefulness of the rolling-ball viscometer in low-viscosity regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439249
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  • 6
    Electronic Resource
    Electronic Resource
    Prediction of saturated liquid viscosity for some halocarbon refrigerants based on the van der Waals model (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 567-571 
    Details
    ISSN: 1572-9567
    Keywords: close-packed volume ; halocarbon ; saturated liquid ; van der Waals model ; viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The viscosity data of saturated liquid halocarbon refrigerants are satisfactorily predicted by a method based on the hard-sphere theory of transport properties. The hard-sphere close-packed volume can be correlated with Bondi's hardsphere volume. The absolute average deviations between calculated and experimental values for 15 halocarbon refrigerants are 6.3%. It is found that the proposed method can give better results than the previous methods proposed by Gordon et al., Li and Poole, and Srinivasan and Murthy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01563714
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    Paper (German National Licenses)
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