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  • Articles  (26)
  • Chemistry  (20)
  • Liquid chromatography  (4)
  • General Chemistry  (2)
  • Actinorhizas
  • Gonadotrops
  • Seismology
  • 2000-2004
  • 1980-1984  (20)
  • 1940-1944  (6)
  • 1935-1939
  • 1983  (6)
  • 1982  (14)
  • 1943  (6)
  • 1
    Electronic Resource
    Electronic Resource
    The brain-pituitary-gonadal axis in the rainbow trout, Salmo gairdneri (1983)
    Springer
    Cell & tissue research 233 (1983), S. 377-388 
    Details
    ISSN: 1432-0878
    Keywords: Gonadotrops ; Gonadotropin secretion ; Steroids ; Brain-pituitary-gonadal axis ; Juvenile teleost
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In a cytophysiological study it was investigated whether in juvenile trout gonadal steroids stimulate the gonadotropic (GTH)-cells directly or indirectly via the brain. Pituitaries of donor animals were transplanted into the caudal musculature of testosterone-treated and non-testosterone-treated host fish. Testosterone treatment caused an increase in GTH-content in the in situ pituitaries and in the grafts. Accordingly, the gonadotrops displayed ultrastructural changes such as the appearance of well-developed Golgi systems and large globules. The stimulation of the morphological development of gonadotrops and of synthesis and storage of GTH in the allografted pituitaries indicates that testosterone affects the GTH-cells directly. In untreated juvenile trout the gonadotropin content of the pituitary and the gonadotropin concentration in the plasma vary with the time of year. This variation and the role of testosterone and gonadotropin-releasing hormone on the release of GTH are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238304
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  • 2
    Electronic Resource
    Electronic Resource
    Die Polymerisation des Isoprens durch Bleicherden; Darstellung eines aliphat. Diisoprens. (Über Polymerisationsreaktionen von Dienen, V. MitteilungIV. Mitteil.: Th. Lennartz, B. 76, 1006 [1943].) (1943)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 76 (1943), S. 1161-1165 
    Details
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19430761202
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  • 3
    Electronic Resource
    Electronic Resource
    Nematodes (Longidorus sp. andTylenchorhynchus microphasmis loof) in growth and nodulation of sea buckthorn (Hippophaë rhamnoides L.) (1983)
    Springer
    Plant and soil 73 (1983), S. 141-147 
    Details
    ISSN: 1573-5036
    Keywords: Actinorhizas ; (Actinomycetes) ; Ecology ; Hippophaë ; (Mystiflora: Elaeagnaceae) ; Longidorus ; (Nematoda: Longidoridae) ; Nodulation ; Soil ; sterization ; Vegetational succession ; Tylenchorhynchus (Nematoda: Tylenchrohynchidae)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Hippophaë rhamnoides seedlings were grown in sterilized and unsterilized soil from a decliningH. rhamnoides scrub, to which different numbers ofLongidorus sp. andTylenchorhynchus microphasmis were added. In sterilized and unsterilized soil, retardation of growth, content of dry matter in the shoots, and incidence of deformed short lateral roots of test plants were positively correlated with counts of both nematode species. Nitrogen content in the shoots, nodulation on the roots of test plants and increase increase in nematodes were negatively correlated with the initial number of both nematode species in sterilized soil. In unsterilized soil, an unknown biotic factor was present that reduces growth ofH. rhamnoides, nodulation and multiplication of the nematodes. This factor seems to interact with the nematodes in reducing growth ofH. rhamnoides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197763
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  • 4
    Electronic Resource
    Electronic Resource
    Die Genehmigungsverfahren nach dem Bundes-Immissionsschutzgesetz. Von M. Pütz und K. H. Buchholz. Erich Schmidt Verlag. Berlin-Bielefeld-München 1982. 1. Aufl., 445 S., zahlr. Abb. und Tab., geb., DM 128,- (1983)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 55 (1983), S. 515-515 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330550704
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  • 5
    Electronic Resource
    Electronic Resource
    Preconcentration and LC analysis of chlorophenols, using a styrene-divinyl-benzene copolymeric sorbent and photochemical reaction detection (1982)
    Springer
    Chromatographia 16 (1982), S. 53-59 
    Details
    ISSN: 1612-1112
    Keywords: Liquid chromatography ; Chlorophenols in water ; Preconcentration ; Post-column photochemical dechlorination ; Electrochemical, UV and fluorescence detection ; Column switching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A specific HPLC method has been developed for the trace analysis of lower chlorinated aromatic compounds. The method consists of an on-line preconcentration and a post-column reaction step. On-line preconcentration of mono- and dichlorophenols from aqueous samples has been performed using PRP1, a divinylbenzene-styrene copolymeric sorbent as packing material for both pre-and analytical column. Enrichment factors of over 300 were obtained compared to regular (100 μl) loop injections, even for the highly polar monochlorophenols. After reversed-phase separation, post-column photochemical dechlorination is carried out directly in the eluent stream, using a photochemical reactor. Upon dechlorination, fluorescent products are formed, which can be detected selectively. The resulting fluorescence signal shows a linear response to the quantity of solute present over 2 to 3 orders of magnitude (correlation coefficients: 0.990–0.98). For the mono- and dichlorophenols, the detection limit of the photoconversion method is in the lower nanogram range. The method is especially suitable for the analysis of complex matrices such as effluent water samples or biological fluids containing traces of the polar chloroaromatic compounds together with large amounts of other constituents, which interfere when using more general methods of detection like UV absorption. The potential of this technique for automation has been demonstrated by using a microprocessor-controlled column switching unit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02258869
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  • 6
    Electronic Resource
    Electronic Resource
    Photochemical reaction detection of phylloquinone and menaquinones. A comparison with chemical post-columns reduction for fluorescence detection (1982)
    Springer
    Chromatographia 15 (1982), S. 459-467 
    Details
    ISSN: 1612-1112
    Keywords: Liquid chromatography ; Photochemical reaction detection ; Chemical post-column reduction ; Fluorimetric detection ; Air segmented flow systems ; Non-aqueous reversed-phase chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new photochemical reaction method for the on-line fluorimetric detection of natural vitamin K homologs was developed. In addition to its high sensitivity, the method features an interesting selectivity for the determination of these compounds in a complex matrix such as human serum. The formation of different photolysis products as a function of reaction conditions, and the optimalisation of a segmented flow reaction system will be discussed. The results indicate that the method is 4 times more sensitive than UV detection, and at least as selective as fluorescence detection after post-column chemical reduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261609
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  • 7
    Electronic Resource
    Electronic Resource
    Optimum conditions for the separation of nucleobases and nucleosides on unmodified silica by HPLC (1982)
    Springer
    Chromatographia 15 (1982), S. 282-288 
    Details
    ISSN: 1612-1112
    Keywords: Liquid chromatography ; Nucleobases ; Nucleosides ; Silica gel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention behaviour of nucleobases and nucleosides on unmodified silica with dichloromethane-methanol-water mixtures has been systematically investigated. The degree and order of retention can be varied over a wide range by changing the pH, the type and concentration of the acidic additives and by the methanol and water content of the mobile phase. The retention process cannot be considered as simple adsorption but rather as a very complex mixed distribution process of adsorption and absorption including the involvement of ion-pair formation. Further data on the effect of the type of silica (source of supply) on retention behaviour, column efficiency and column reproducibility are reported. The practical application of unmodified silica for the separation of nucleobases and nucleosides is demonstrated by the analysis of a hydrolysate of calf thymus DNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265678
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  • 8
    Electronic Resource
    Electronic Resource
    An improved interface for liquid chromatography/electron-capture detector coupling. Part II (1982)
    Springer
    Chromatographia 16 (1982), S. 237-241 
    Details
    ISSN: 1612-1112
    Keywords: Liquid chromatography ; Electron capture detection ; Improved interface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An improved interface for the coupling of a liquid chromatograph (LC) and an electron-capture detector (ECD) allows the use of the LC-ECD combination for the determination of various types of chlorinated aromatic compounds. The addition of up to 6% of dioxan to the hexane used as mobile phase can be tolerated without serious deterioration of detector performance. Derivatization of polar compounds such as anilines, phenylurea herbicides, chlorophenols and hydroxylated polychlorobiphenyls with fluorine-and non-fluorine-containing acid anhydrides is a useful tool to extend the application range of LC-ECD. As an example, the analysis of a spiked soil sample is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02258910
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of nitrated polycyclic aromatic hydrocarbons by glass capillary gas chromatography using different detectors (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 19-26 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography, glass capillary ; Selective detection ; Nitrated polycyclic aromatic hydrocarbons ; Carbon black ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Glass capillary gas chromatography has been investigated as a method for the analysis of nitrated polycyclic aromatic hydrocarbons (nitro-PAH) using both splitless and on-column injection techniques. The nitro-PAH showed good chromatographic performance and thermal stability under the GC conditions used. Retention times and response factors of several nitro-PAH were compared to those of conventional PAH.Simultaneous flame ionization and thermionic nitrogen selective detection was used to facilitate identification of nitro-PAH in complex samples. The feasibility of the method is demonstrated on two samples of commercial carbon black. Besides 1-nitropyrene several isomeric dinitropyrenes have been identified.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050104
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  • 10
    Electronic Resource
    Electronic Resource
    The use of chemically bonded stationary phases in thin-layer chromatography-a surveyBased on a paper presented at the Second Intemational Symposium on Instrumental High Performance Thin Layer Chromatography, Interlaken, May 1982. (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 476-482 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, TLC ; Reversed phase TLC ; Chemically bonded stationary phases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An overview is given of the literature publisned in the field of thin-layer chromatography on chemically bonded phases. Aspects which merit further attention are: quantitative analysis, organic solvent selection, stationary phase characteristics, surface modification of precoated silica plates, ion-pair chromatography and correlation of thin-layer and column chromatographic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050905
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