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  • 1
    Electronic Resource
    Electronic Resource
    Thermogravimetric studies of poly(oxymethylene-co-dimethylsiloxane) copolymers
    Amsterdam : Elsevier
    Thermochimica Acta 225 (1993), S. 67-74 
    Details
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(93)85083-L
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution of Cadmium in Blood and Tissues of Wild Birds (1996)
    Springer
    Archives of environmental contamination and toxicology 30 (1996), S. 252-258 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. The principal aim of this study is to establish the kinetic behavior of cadmium by determining the concentrations of this element in the blood and in different tissues of wild birds exposed to environmental cadmium. We have studied a total of 118 birds living in the southeast of Spain, a zone with a Mediterranean climate and stopover point for important migratory species. The distribution pattern followed by the cadmium in our samples reveals that the kidney is the primary organ for accumulation, followed by the liver and, to lesser extent, the brain and bone. Low concentrations were found in the tissues and in the blood. The study of correlations between the different tissues and blood suggests a compartmental behavior of cadmium under these exposure conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215805
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution of cadmium in blood and tissues of wild birds (1996)
    Springer
    Archives of environmental contamination and toxicology 30 (1996), S. 252-258 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The principal aim of this study is to establish the kinetic behavior of cadmium by determining the concentrations of this element in the blood and in different tissues of wild birds exposed to environmental cadmium. We have studied a total of 118 birds living in the southeast of Spain, a zone with a Mediterranean climate and stopover point for important migratory species. The distribution pattern followed by the cadmium in our samples reveals that the kidney is the primary organ for accumulation, followed by the liver and, to lesser extent, the brain and bone. Low concentrations were found in the tissues and in the blood. The study of correlations between the different tissues and blood suggests a compartmental behavior of cadmium under these exposure conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215805
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  • 4
    Electronic Resource
    Electronic Resource
    Separation of chlorophylls and their degradation products in marine phytoplankton by reversed-phase high-performance liquid chromatography (1987)
    Springer
    Chromatographia 23 (1987), S. 26-30 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ammonium acetate buffer eluent ; Chlorophylls and degradation products ; Marine phytoplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary An RP-HPLC procedure which separates chlorophylls and their degradation products is described. By employing an amonium acetate buffered mobile phase and a linear gradient elution, complex mixtures of chloroand phaeopigments are separated in less than 30 minutes. The method has been applied to the control of chlorophyll enzymatic degradation in cultures of two algal species, and has also been successfully used in the analysis of algal xanthophylls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310413
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  • 5
    Electronic Resource
    Electronic Resource
    Changes in fatty acids, amino acids and carbon/nitrogen biomass during nitrogen starvation of ammonium- and nitrate-grownIsochrysis galbana (1992)
    Springer
    Journal of applied phycology 4 (1992), S. 95-104 
    Details
    ISSN: 1573-5176
    Keywords: amino acids ; biomass ; fatty acids ; Isochrysis ; nitrogen ; starvation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Growth of cells ofIsochrysis galbana with either nitrate or ammonium as the N-source, and the effects of subsequent N-starvation of these cells, were compared. During exponential N-sufficient growth nitrate-grown cells had double the fatty acid content of the ammonium-grown cells but lower concentrations of a few amino acids. Following resuspension in N-free medium the fatty acid content of the ammonium-grown cells increased to that of the nitrate-grown cells, but there was no further increase in fatty acid content on a C-biomass or cellular basis during the following 4 days for either culture. Fatty acid synthesis was continuous during N-starvation, while it occurred during the light-phase only in exponential growth. The proportion of 18:1n9 fatty acid increased from 10 to 25% total fatty acids during N-starvation. Intracellular free amino acid content decreased in a similar manner in both cultures on N-starvation, the ratio of intracellular free amino-N/cell-C falling more rapidly than overall cellular N/C. It was concluded that optimal amino acid and fatty acid content would be attained by growth in the presence of excess nitrate. Measurements of chlorophyll and carotenoid content and ofin vivo fluorescence indicated that these parameters had potential for monitoring the C and N biomass in cultures grown under relatively constant (not necessarily continuous) illumination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442457
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  • 6
    Electronic Resource
    Electronic Resource
    Cationic polymerization of 2,4,4-trimethyl-2-oxazoline (1990)
    Springer
    Polymer bulletin 23 (1990), S. 571-576 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The cationic homopolymerization of 2,4,4-trimethyl-2-oxazoline using BF3Et2O as initiator at different initiator concentrations, temperatures, times and solvents of polymerization were carried out. The effect of these variables on the polymerization yield and viscosity of the polymers were studied. Polymers were characterized by IR.1H NMR and13C NMR which support that the polymerization reaction occurs by ring opening of oxazoline through oxazolinium intermediates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01033100
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of injection conditions in reversed-phase high-performance liquid chromatography of chlorophylls and carotenoids (1991)
    Springer
    Chromatographia 31 (1991), S. 589-594 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Injection conditions ; Chlorophylls and carotenoids ; Extraction solvents ; Phytoplankton pigments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The RP-HPLC analysis of chlorophylls, their degradation products (chloropigments) and carotenoids is very sensitive to the nature of the injection solvent. The effect of sample-solvent interaction can result in the production of distorted, or even false, peaks that could be erroneously interpreted as “pigment like” or as poor chromatographic resolution. The previously suggested theoretical explantion, based on differences in solvent characteristics as expressed by the Polarity Index (P′) or even by the more precise solvent strength parameter for reversed-phase systems (S) we use, was unsatisfactory. The problem seems more complex, with other parameters such as injection volume and solute concentration or solvent selectivity also playing a role. As a practical consequence, however, suggesions are made for optimum injection conditions. Also, the presence of ion-pairing reagents in the injection solvent is demonstrated to be unnecessary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279480
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  • 8
    Electronic Resource
    Electronic Resource
    High performance liquid chromatographic separation of chlorophyllc forms from marine phytoplankton on octylsilica bonded phases (1998)
    Springer
    Chromatographia 48 (1998), S. 677-680 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chlorophyllc ; Marine phytoplankton ; Octylsilica phases ; Photosynthetic pigments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The separation of mono- and divinyl chlorophyllc forms was estudied employing several octylsilica and octadecylsilica columns under isocratic conditions. In this paper we show that, using the adequate mobile phases, the monomeric C8 columns can separate the mentioned chlorophylls. A comparison between C8 and C18 columns reveals that monomeric OS phases provide always higher resolution of the MV- and DV chlorophyllc pairs. Such a result could be explained in terms of differences in column polarity. When adequate gradient profiles and injection conditions are used the separation is accomplished together with that of other chlorophylls and carotenoids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467598
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  • 9
    Electronic Resource
    Electronic Resource
    High performance liquid chromatography of chlorophylls c3, c1, c2 and a and of carotenoids of chromophyte algae on a polymeric octadecyl silica column (1993)
    Springer
    Chromatographia 35 (1993), S. 543-547 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chlorophyll c pigments ; Chromophyte algae ; Monomeric and polymeric ODS phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Photosynthetic pigments from chromophyte marine algae were analyzed using three different commercial columns with ODS stationary phases of different degrees of polymerization. No separation of chlorophylls c1 and c2 could be achieved using monomeric or intermediate stationary phases, even at subambient temperatures. As with other planar compounds, the polymeric stationary phase showed the highest selectivity for chlorophyll c pigments, allowing the simultaneous separation of chlorophylls c3, c1 and c2 and other pigments occurring in chromophyte algae by using a binary gradient starting with a highly buffered mobile phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267914
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature-programmed high performance liquid chromatography separation of mono- and divinyl chlorophyll forms from marine phytoplankton (1995)
    Springer
    Chromatographia 41 (1995), S. 539-543 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Divinyl chlorophyll a and b (chl a2 and chl b2) ; Polymeric ODS phases ; Prochlorophytes ; Temperature step gradients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Divinyl chlorophyll a (a2) and divinyl chlorophyll b (b2) are chemotaxonomic marker pigments for the marine prochlorophytes, and can be used to study their distribution in marine samples. In this paper we report a baseline resolution of mono- and divinyl forms of chlorophylls a and b employing polymeric ODS stationary phases at sub-ambient temperatures. The simultaneous resolution of mono- and divinyl forms of chlorophylls a and b, chlorophylls c1, c2, c3, Mg 3,8-divinylphaeoporphyrin a5 monomethyl ester (MgDVP), and phytol-substituted chlorophylls c was achieved when a temperature step gradient was employed during the analysis. An example is given of the utility of the protocol in oceanic field samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269717
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