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  • 1
    Electronic Resource
    Electronic Resource
    Size and visibility of Baltic cod eggs with reference to size-selective and stage dependent predation mortality (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 12 (1996), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Size of Baltic cod eggs from incubation experiments and from field samples was determined by microscopic analysis. Results from plankton samples were compared with corresponding size distributions of cod eggs found in herring stomachs. The influence of fixation on size of different developmental stages was studied. Live eggs from incubation experiments were also sized repeatedly throughout the developmental period with an optical plankton counter (OPC) based on light attenuance measurements as this was assumed to be more closely related to the visibility of the eggs for potential predators than egg diameter as obtained by microscopic analysis.Preservation in formaldehyde solution caused a small reduction in egg diameter (2.2%) whereby no differences between the developmental stages were detected. Egg size decreased slightly during incubation (6.9%) while the OPC measurements revealed a substantial increase in light attenuance during egg development (42.2%). In the field, a general decrease in egg size with increasing depth was observed while no change between the developmental stages was detectable. The mean size of eggs ingested by herring was slightly lower than in the water column which was most pronounced for the late stages containing a well-developed embryo. The frequency of eggs in an advanced stage of development was considerably higher in the stomachs than in corresponding plankton samples. Therefore, it is suggested that the selection of further developed egg stages by predatory fish in the central Baltic Sea, i.e. herring and sprat, is due to an increase of visibility during egg development in relation to growth and pigmentation of the embryo. Thus it is likely that egg mortality due to predation is stage-dependent rather than strictly size-selective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1996.tb00067.x
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  • 2
    Electronic Resource
    Electronic Resource
    Schriftenschau (1973)
    Springer
    Journal of ornithology 114 (1973), S. 511-521 
    Details
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01641528
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  • 3
    Electronic Resource
    Electronic Resource
    Heavy metal-induced alkylation of adenine nucleotides by ethyl-nitroso-urea (1974)
    Springer
    Naturwissenschaften 61 (1974), S. 38-38 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602901
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Frage einer rhythmischen Wasserausscheidung bei jungen Säuglingen (1946)
    Springer
    Journal of molecular medicine 24-25 (1946), S. 90-92 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01734350
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrogen bond catalysis of mononucleotide ethylation supports non-random DNA alkylations by N-ethyl, N-nitrosourea (1984)
    Springer
    Cellular and molecular life sciences 40 (1984), S. 734-736 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The axial (ax.) and equatorial (eq.) diastereomeric forms of phosphate triesters resulting from reactions of N-ethyl, N-nitrosourea with 3 cyclic mononucleotides were analyzed by column liquid chromatography (CLC). Evidence is presented that the 2′OH group of 3′, 5′cAMP essentially contributes to the stereoselective eq. alkyl substitution, most probably by hydrogen bonding catalysis. The neighboring group direction of ethylation gives substantial support to non-random DNA alkylations by NEU.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01949749
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  • 6
    Electronic Resource
    Electronic Resource
    Erfahrungen mit transportablen Röntgeneinrichtungen (1932)
    Springer
    Lung 81 (1932), S. 64-69 
    Details
    ISSN: 1432-1750
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149090
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  • 7
    Electronic Resource
    Electronic Resource
    Adsorption from binary solvent mixtures onto silica gel by HPLC frontal analysis (1982)
    Springer
    Chromatographia 15 (1982), S. 743-747 
    Details
    ISSN: 1612-1112
    Keywords: Liquid-solid chromatography ; Frontal analysis ; Adsorption from binary mixtures ; Silica gel ; Thermodynamics of adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The chromatographic technique of frontal analysis is applied to measuring adsorption from binary liquid mixtures by silica gel. The complete adsorption isotherm of a solvent mixture is obtained by measuring the break-through curves for a series of small concentration steps of the mobile phase. This method offers a direct way to determine the composition of the stationary phase in liquid-solid chromatography with mixed mobile phases. The surface excess isotherms of all binary systems formed by benzene, cyclohexane, and 1,2-dichloroethane, at the solution-silica gel interface at 25 °C are presented. The data of the three systems are shown to be thermodynamically mutually consistent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261368
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  • 8
    Electronic Resource
    Electronic Resource
    Gruppenspezifische Analyse von Citratcyclusintermediaten in der modernen Flüssigkeits-Chromatographie im unteren Nanoval-Bereich (1972)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 261 (1972), S. 354-358 
    Details
    ISSN: 1618-2650
    Keywords: Analyse von Carbonsäuren (Citratcyelus) ; durch Chromatographie ; Säule im nVal-Bereich
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird über die Analyse von Citratcyclusintermediaten mit Hilfe der modernen Flüssigkeits-Chromatographie (LC) berichtet. Der photometrische Nachweis der kurzkettigen Carbonsäuren im Säuleneluat erfolgt mit Hilfe eines gruppenspezifischen Indicators (o-Nitro-Phenol). Bei gradientenfreier Elution beträgt der Rauschpegel der Basislinie des Chromatogramms max. 1 · 10−3 E und der Flächenwert für 10 nVal Essigsäure 25 E · sec. Bei wiederholten Probenaufgaben betragen die Abweichungen vom Flächenmittelwert max. ± 5% (VB 95%). Die Aufbereitung biologischer Proben erfolgt durch Extraktion mit Diäthyläther in einer einfachen säulen-chromatographischen Anlage, die gleichzeitig der Vortrennung sog. „kritischer Säurenpaare” dient. Die Anwendbarkeit der LC auf die Analyse von biologischem Material wird mit einem Chromatogramm von 10 μl Humanserum gezeigt.
    Notes: Abstract The analysis of TCA intermediates and related compounds with modern liquid chromatography (LC) is described. Short-chain carboxylic acids are detected by adding a compound specific indicator (o-nitro-phenol) to the eluent. Without gradient elution, the noise level of the chromatogram baseline does not exceed 1×10−3 O.D. and the peak area for 10 nanoequivalent acetic acid is 25 absorbance seconds. With repeated applications of sample to column, deviations of 5% of the medium peak area value are not exceeded (range of confidence 95%). Preparation of the biological samples is achieved by ether extraction with a simple column-chromatography apparatus, which at the same time, preseparates critical acids otherwise not completely separable by elution without gradient. The application of LC to the analysis of biological material is demonstrated by a chromatogram of 10 μl of human serum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00786994
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