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  • 1
    Keywords: Konferenzschrift ; Forschungsbericht
    Type of Medium: Online Resource
    Pages: 164 p. = 3,21 MB, text and images , graphics
    Edition: [Elektronische Ressource]
    Series Statement: Wissenschaftliche Berichte / Forschungszentrum Karlsruhe, Technik und Umwelt FZKA 6291
    Language: English
    Note: Differences between the printed and electronic version of the document are possible. - nIndex , Also available as printed version , Systemvoraussetzungen: Acrobat Reader.
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  • 2
    Type of Medium: Book
    Pages: 79 S , graph. Darst.
    Language: German
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Annals of hematology 49 (1984), S. 213-217 
    ISSN: 1432-0584
    Keywords: Electrical breakdown technique ; Stomatocytosis of latex particles ; Rat erythrocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The uptake of macromolecules by erythrocytes can be achieved with the electrical breakdown technique [2, 4]. In this technique the erythrocyte membranes are subjected to a high external electrical field pulse for a short period. Local, reversible breakdowns of the cell membrane occur above a critical field strength which lead to a time-dependent increase in the permeability of the membrane. By this means, human erythrocyte membranes can be made permeable to DNA, pharmaceutical compounds, and latex particles following an electrical field pulse [1, 3, 5]. Larger particles should also be taken up by erythrocytes using this method. Vienken et al. [5] demonstrated the entrapment of latex particles with a diameter of 0.091 μm in human erythrocyte ghosts, although this was shown with only a single electron micrograph which does not prove that the ghost membrane was intact. In our experiments in order to entrap latex particles with a diameter of 0.26 μm rat erythrocytes were subjected to an electrical field pulse of 12 kV/cm with a decay time of 60 μs. Experiments using the electron microscope show that after such an electrical field pulse the uptake of latex particles by rat erythrocytes follows the stomatocytotic pathway. We show further that using electron microscopic techniques, a single section cannot demonstrate the completed uptake of a latex particle by the erythrocyte.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 220-221 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An analytical method for the determination of trace amounts of Galaxolide® (HHCB) by HPLC is presented. It is based on the separation of HHCB in different samples by a C18-column and a gradient elution by water and acetonitrile, both containing some acetic acid. The detection is carried out with a combination of a fast scanning UV detector and a fast scanning fluorescence detector. The fluorescence detection limit is 5 μg/L HHCB without sample pretreatment. HHCB adsorbed on solids or suspended solids can be extracted by ethanol.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-0662
    Keywords: NOx ; J(NO2) ; soil emissions ; photostationary state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Ambient mixing ratios of NO, NO2, and O3 were determined together with the photolysis frequency of NO2, JNO2, at a rural, agricultural site in Germany. The data were collected during the POPCORN-campaign from August 1 to August 24, 1994, in a maize field 6 m above ground. The medians of the NO, NO2, and O3 mixing ratios between 10:00 and 14:00 UT were 0.25, 1.09, and 45 ppbv, respectively. The corresponding median of JNO2 was 6.0 · 10−3 s−1. NOx = NO + NO2 showed a strong diurnal variation with maximum mixing ratios at night, suggestive of a strong local surface source of NO, probably by microbial activity in the soil. The estimated average emission rate was 40 ng(N) m−2 s−1 of NOx, the major part of it probably in the form of NO. The available measurements allowed the estimation of the local NOx budget. At night the budget is almost closed and the measured NOx mixing ratios can be explained by the local source, local dry deposition of NO2, formation of NO3 and N2O5, and vertical exchange of air across the nocturnal inversion. During day-time, the local surface source of NO is not sufficient to explain the measured mixing ratios, and horizontal advection of NOx to the site must be included. The NO2/NO ratio during the morning und late afternoon is lower than predicted from the photostationary state owing to the local NO surface source, but is regulary higher during the hours around noon. For noon, August 10, 1994, the NO2/NO ratio was used to derive the momentary lower limit for the concentration of the peroxy-radicals of 2.2 · 109 cm−3 (86 pptv).
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 27 (1989), S. 431-435 
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; UV diode array detection ; Electro chemical detection ; Herbicides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An automated procedure is described for simultaneous UV detection at three different wavelengths and electro chemical detection in series of some residual herbicides. UV spectra of nine compounds of different compound groups are presented. Liquid-liquid extraction with dichloromethane and an enrichment of about one thousandfold has been used. Recovery rates after enrichment and detection limits of four s-triazine, three phenyl urea herbicides, metazachlore and metamitrone in river and drinking water are shown. It is concluded that the herbicides examined can be detected at levels between 10ng l−1 and 50ngl−1, without the necessity of derivatisation or clean-up processes.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 29 (1990), S. 24-30 
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Diode array, electro chemical and fluorescence detectors ; Phenoxy acid herbicides in water ; Automated analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An automated procedure is described for the simultaneous UV, fluorescence and electro chemical detection in series of bentazone and six phenoxy acid herbicides. A two step liquid-liquid extraction with dichloromethane giving an enrichment about a thousand fold has been used. Recovery rates after enrichment and detection limits of bentazone, 2,4 D, 2,4 DB, MCPA, MCPB, MECOPROP and DICHLORPROP in river water are given. It is concluded that the herbicides examined can be detected at levels between 20 ngl−1 without the necessity of derivatisation.
    Type of Medium: Electronic Resource
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