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  • 1
    Electronic Resource
    Electronic Resource
    Ultraviolet and Visible Absorption Spectra in Ethyl Alcohol (1951)
    s.l. : American Chemical Society
    Analytical chemistry 23 (1951), S. 1740-1747 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60060a006
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  • 2
    Electronic Resource
    Electronic Resource
    Fluorescent Spectra of Solid Solutions of Naphthalene with Added Anthracene (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 736-737 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Some subsequent results obtained in the same manner from crystals of naphthalene with added anthracene are more complex; but a tentative explanation may be given with the aid of the exciton theory. The spectra consisted of fairly broad overlapping bands, similar to those found previously. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173736b0
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  • 3
    Electronic Resource
    Electronic Resource
    Ammonium Nitrate Propellants Based on a Polyester-Acrylate Binder (1962)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 1 (1962), S. 23-27 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i360001a006
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal noise current inside a gas of noninteracting charged bosons (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2683-2684 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An application of Bose–Einstein statistics leads to an expression for the mean-square value of the spontaneous fluctuations in current that give rise to thermal noise inside a gas of noninteracting charged bosons. Above the Einstein condensation temperature the boson gas thermal noise current is seen to be identical to the corresponding Fermi–Dirac thermal noise current. Below the Einstein condensation temperature, the magnitude of the boson gas thermal noise current decreases as the number of bosons in excited states decreases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105883
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  • 5
    Electronic Resource
    Electronic Resource
    IN VITRO EFFECTS OF PROSTAGLANDINS ON THYROID GLAND METABOLISM (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 180 (1971), 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.1749-6632.1971.tb53197.x
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  • 6
    Electronic Resource
    Electronic Resource
    Deposition of cellular fibronectin and desorption of human serum albumin during adhesion and spreading of human endothelial cells on polymers (1991)
    Springer
    Journal of materials science 2 (1991), S. 227-233 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract More insight into the mechanism of adhesion of human endothelial cells (HEC) on to polymeric surfaces may lead to the development of improved small-diameter vascular grafts. HEC suspended in 20% human serum-containing culture medium adhere and spread well on moderately water-wettable polymers such as tissue culture polystyrene (TCPS). Earlier it was demonstrated that during adhesion and spreading of HEC on TCPS, cellular fibronectin is deposited on to this surface. It was postulated that fibronectin deposition is accompanied by desorption of adsorbed serum proteins, e.g. human serum albumin (HSA). The amounts of adsorbed (cellular) fibronectin and HSA on TCPS surfaces pretreated for 1 h with solutions of human serum (ranging from 0.01%–20%), were determined after incubation of these surfaces for 6 h with HEC in culture medium and after incubation with culture medium without cells. Protein adsorption was determined by means of a two-step enzyme-immunoassay (EIA). HEC adhesion and spreading on TCPS resulted in a significant deposition of fibronectin irrespective of the serum concentration in the solution used for the pretreatment of TCPS. The deposition of cellular fibronectin on to TCPS, pretreated with human serum, was accompanied by displacement of adsorbed HSA. Desorption of HSA from TCPS was only detectable with the EIA at serum concentrations ranging from 0.01%–1%. Using131-l-labelled HSA as tracer protein; it could, however, be demonstrated that HSA was also displaced from TCPS, pretreated with solutions of higher serum concentrations. Pretreatment of the hydrophobic vascular graft material PET (poly(ethylene terephthalate); Dacron) and of FEP (fluoroethylenepropylene copolymer; a Teflon-like polymer) with a solution containing 20% human serum resulted in a reduced adhesion of HEC compared to uncoated surfaces. We suggest that this may be caused by a poor displacement of adsorbed serum proteins from these hydrophobic surfaces by cellular fibronectin. This may explain why HEC normally fail to adhere on to prosthetic surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00703376
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  • 7
    Electronic Resource
    Electronic Resource
    The surface modification of polymers to modulate endothelial cell growth (1996)
    Springer
    Journal of materials science 7 (1996), S. 119-123 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: The effect of nitrogen ion implantation or ion-assisted film deposition on the growth of human endothelial cells in vitro on a substrate has been studied. It was shown that the largest change occurs when TiO2 films were reactively sputtered onto the substrates, while the most passive surface was reactively sputtered SiO2. SEM pictures of the cells adhering to the various treated surfaces show that the cells were healthy. Future studies on the effect of alloy films and their oxides and nitrides are proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058723
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  • 8
    Electronic Resource
    Electronic Resource
    Cytotoxicity investigations of plasma sprayed calcium phosphate coatings (1994)
    Springer
    Journal of materials science 5 (1994), S. 371-375 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: One potential alternative material to replace hydroxyapatite (HAp) as a coating material for plasma-sprayed coatings on implants for hip replacement is fluorapatite (FAp). FAp has advantages over HAp regarding the capability of being chemically stable during the coating process. This leads to surface coatings containing high apatite rates with a mechanical stability (bond strength, microhardness) comparable to HAp. From the technical point of view the production of FAp coatings is well investigated, although studies on biocompatibility of FAp coatings are fewer. This paper reports the production of HAp and FAp coatings with varying solubilities by plasma spraying and their in vitro cytotoxicity. Varying solubilities were realized by using modified plasma-spray parameters in common with suitable apatite powders with different crystallinities. Coating solubilities were evaluated by immersing the plasma-sprayed coatings in deionized water and electrolyte solution. Afterwards, cytotoxicity tests were performed using a modified half-slide technique. Cell attachment and cell morphology were evaluated. Neither HAp nor FAp coatings exhibited cytoxic influence on cells in culture. Results suggest that HAp coatings stimulate cell growth and FAp coatings do not. This could be explained by a negative effect on cell growth of the dissolved fluoride ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058966
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  • 9
    Electronic Resource
    Electronic Resource
    Deletion mapping of the yeast pol I promoter (1985)
    Springer
    Current genetics 10 (1985), S. 253-260 
    Details
    ISSN: 1432-0983
    Keywords: Yeast ; RNA polymerase I ; Promoter ; Transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Deletions in the promoter region of the 37S pre-rRNA operon in yeast were constructed and analysed in vivo using an artificial ribosomal minigene present on an extrachromosomal yeast vector. Sequences required for correct transcription initiation were found to be located between positions −192 and +15 relative to the start; a 5′-deletion down to position −133 reduces the transcription yield of the minigene at least five-fold. To allow detection of transcription of the minigene in isolated nuclei of yeast transformed with a minigene-bearing plasmid we attempted to increase the minigene copy number. The transcription yield in vivo appeared not to be proportional to the copy number but was found to be greatly enhanced when two or three mini-genes are present in tandem. α-Amanitin sensitivity of transcription of these minigenes in isolated nuclei proved that RNA polymerase I is responsible for their transcription.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365621
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  • 10
    Electronic Resource
    Electronic Resource
    Acute toxicity test for terrestrial hazard assessment with exposure of Folsomia candida to pesticides in an aqueous medium (1996)
    Springer
    Archives of environmental contamination and toxicology 30 (1996), S. 9-14 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract An acute toxicity test is described in which the springtail Folsomia candida was exposed to pesticides in water during four days. The test method was designed for the direct and economical chemical analysis of all concentrations during the execution of the test. The 96 h EC50 values determined for parathion, carbofuran, dimethoate, and oxamyl were 0.0087, 0.222, 16.2, and 23.6 mg/L, respectively. The toxicity of the pesticides was correlated with their lipophilicity. For terrestrial hazard assessment procedures, the use of the intrinsic toxicity of chemicals to soil organisms, as determined in this simple test, is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00211323
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