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  • Articles  (38)
  • 1990-1994  (25)
  • 1965-1969  (13)
  • Chemistry and Pharmacology  (36)
  • Energy, Environment Protection, Nuclear Power Engineering  (2)
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  • Articles  (38)
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  • 1
    Electronic Resource
    Electronic Resource
    Quantitative Determination of Linear Primary Alcohol Ethoxylate Surfactants in Environmental Samples by Thermospray LC/MS (1994)
    s.l. : American Chemical Society
    Analytical chemistry 66 (1994), S. 699-705 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00077a019
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  • 2
    Electronic Resource
    Electronic Resource
    Increased Tyrosine Hydroxylase Activity after Drug-induced Alteration of Sympathetic Transmission (1969)
    [s.l.] : Nature Publishing Group
    Nature 221 (1969), S. 1264-1264 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Sprague-Dawley male rats, 120-180 g, were obtained from Hormone Assay (Chicago, Illinois) and housed 72 h before use. The weights of control and treated animals were within a 20 g range at the start of each experiment. Animals were killed by a blow on the head and the adrenal glands were rapidly ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2211264a0
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  • 3
    Electronic Resource
    Electronic Resource
    2,3,7,8-TCDD and 2,3,7,8-TCDF in blue crabs and American lobsters from the Hudson-Raritan estuary and the New York bight (1994)
    Springer
    Bulletin of environmental contamination and toxicology 52 (1994), S. 734-741 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195496
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  • 4
    Electronic Resource
    Electronic Resource
    Metabolism and pharmacokinetics of prostaglandin E1 administered by intravenous infusion in human subjects (1994)
    Springer
    European journal of clinical pharmacology 46 (1994), S. 275-277 
    Details
    ISSN: 1432-1041
    Keywords: Prostaglandin E1 ; Infusion ; pharmacokinetics ; metabolism ; volunteers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract In a single-blind, randomized, two-way crossover study with 12 healthy male volunteers, 60 μg of prostaglandin E1 (PGE1) or placebo was administered by intravenous infusion during a 120-min period. PGE1, 13,14-dihydro-PGE1 (PGE0) and 15-keto-PGE0 plasma concentrations were measured by a highly specific and sensitive GC-MS/MS method. Endogenous PGE1 plasma concentrations ranged between 1.2 and 1.8 pg·ml−1. Endogenous PGE0 and 15-keto-PGE0 plasma concentrations varied from 0.8 to 1.3 pg·ml−1 and from 4.2 to 6.0 pg/ml respectively. During intravenous infusion of PGE1, plasma PGE1 concentrations rose to a level twice as high as during the placebo infusion. In contrast, PGE0 plasma concentrations were 8 times higher during PGE1 infusion than during placebo infusion, and 15-keto-PGE0 plasma concentrations were 20 times higher. The new analytical method has thus been useful to describe the pharmacokinetics of PGE1 and its metabolites PGE0 and 15-keto-PGE0, during and after intravenous infusion of PGE1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192562
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  • 5
    Electronic Resource
    Electronic Resource
    Propidium-iodide-loaded polyalkylcyanoacrylate particles —labelling conditions and loading capacity (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 147-152 
    Details
    ISSN: 1435-1536
    Keywords: Cyanoacrylate nanoparticles ; propidium iodide ; nanoparticle ; fluorescent labelling ; fluorescent labelling of nanoparticles ; nanoparticle loading capacity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polyalkylcyanoacrylate nanoparticles were labelled with the fluorescent marker propidium iodide to follow their cellular distribution. Fixation of propidium iodide onto the nanoparticles can be achieved by its addition to the polymerization medium after initiating the polymerization process. However, the charged propidium iodide was found to distort the anionic polymerization process. Therefore, polymerization conditions were optimized with regard to the time of marker addition and marker concentration, loading capacity, and monodispersity of the nanoparticles size distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00660304
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  • 6
    Electronic Resource
    Electronic Resource
    Acrylic acid copolymer nanoparticles for drug delivery. Part II: Characterization of nanoparticles surface-modified by adsorption of ethoxylated surfactants (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 100-105 
    Details
    ISSN: 1435-1536
    Keywords: Nanoparticles ; acrylic acid copolymer ; ethoxylated surfactants ; hydrophobic interaction chromatography (HIC) ; poloxamer ; poloxamine ; antarox
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Copolymer nanoparticles of acrylic acid, acrylic amide, acrylic butylester, and methacrylic methylester with increasing content of acrylic acid were produced and surface-modified by adsorption of nonionic (Poloxamer 407, Poloxamine 908, Antarox CO 990) and ionic (Gafac RE 960) surfactants. The coated particles were characterized with regard to parameters relevant for the in vivo organ distribution: coating layer thickness, charge-reducing effect of the coating layer and surface hydrophobicity. Gafac was found to form highly charged surface layers leading to recognition by the reticuloendothelial system (RES). The hydrophobicity of the coating layers decreased with increasing thickness. The thickest coating layers were found on the most hydrophobic particles possessing least content of acrylic acid (1.9%). These particles coated with the nonionics were regarded as sufficiently hydrophilic to potentially reduce the uptake by the RES in vivo. The properties of coating layers can therefore be optimized by variation of the monomer ratios in copolymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652310
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  • 7
    Electronic Resource
    Electronic Resource
    CO2 laser welding of polymers (1992)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 32 (1992), S. 582-585 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Deep penetration welding of polymers can be carried out at high speed with relatively low laser power. This results from an efficient coupling CO2 laser radiation to polymers that leads to volume heating. A brief review of energy coupling and heat transfer effects in polymers under CO2 laser welding conditions is given. Some examples of low power (10 to 100 watt) CO2 welding of polypropylene and polyethylene at depths of up to 1.5 cm are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760320903
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  • 8
    Electronic Resource
    Electronic Resource
    Paleoenvironmental organic indicators in Eocene paleosols from Arctic Canada (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 337 (1990), S. 882-884 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The analytical potential of the combination of solid state NMR and soft ionization mass spectrometry for direct investigations of complex organic matter in soils without chemical pretreatment is demonstrated. The results show that the Oh horizon of a Gleysolic paleosol (±45 Ma) from the Canadian Arctic consists mainly of components of cuticular waxes which include 10-nonacosanol, C15–C36 n-fatty acids, C44–C75 n-alkyl monoesters and C60–C76 diesters. It is likely that these waxes originated from the coniferous and deciduous vegetation which dominated this area when these soils were formed and that the climate was warm and moist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323166
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  • 9
    Electronic Resource
    Electronic Resource
    Pyrolysis-mass spectrometry of whole soils, soil particle-size fractions, litter materials and humic substances: statistical evaluation of sample weight, residue, volatilized matter and total ion intensity (1993)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 346 (1993), S. 697-703 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A set of 115 samples with known organic carbon (Corg) concentrations, divided in the sample groups whole soils (n=39), soil particle-size fractions (n=33) and litter materials and humic substances (n=43), was investigated repeatedly (3–6 replicates) by pyrolysis-mass spectrometry using field ionization as a soft ionization mode (Py-FIMS). Statistical evaluation of the results supplied basic information on the reproducibility of Py-FIMS measurements of these complex organic materials, as well as on the influence of Corg concentration on volatilization and total ion intensity (TII). The relative error in measurement for sample weight amounted to 10%, for percentage of residue to 2%, for percentage of volatilized matter to 5% and both for TII/mg sample and TII/mg Corg to 17%. The relative errors in measurement of sample weight, TII/mg sample and TII/mg Corg of the total sample set corresponded with those of each group, however differences were observed for the percentages of residue and volatilized matter. Linear correlation and regression analyses show that larger Corg concentrations result in a significant increase in percentage of volatilized matter and TII/mg sample, whereas percentages of residue were significantly decreased. On the average of all samples, 75.2% of the variation of TII/mg sample was due to Corg concentration and the percentage of volatilized matter. For the total sample set covering a wide range of plant and humus materials, the relative error in measurement of TII/mg sample was independent of Corg concentration, sample weight, percentage of residue and percentage of volatilized matter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321275
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  • 10
    Electronic Resource
    Electronic Resource
    Trace analysis of cationic surfactants in water using HPLC with conductometric detection (1992)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 342 (1992), S. 711-713 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A simple and fast determination of trace amounts of commercially used cationic surfactants is described. After extraction from water cationic surfactants are separated by HPLC and detected by conductometry. The detection limit is 3 μg/l for distearyldimethylammonium chloride, 16 μg/l for ditallowimidazolinium methosulphate, and 6 μg/l for dodecylpyridinium chloride.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321861
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