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  • 1
    Electronic Resource
    Electronic Resource
    Determination of ascorbic acid in tissues of marine animals by liquid chromatography with electrochemical detection (1980)
    s.l. : American Chemical Society
    Analytical chemistry 52 (1980), S. 2428-2430 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac50064a046
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of methods for determination of ascorbic acid in animal tissues (1983)
    s.l. : American Chemical Society
    Analytical chemistry 55 (1983), S. 1229-1232 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00259a008
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of calcium phosphate-containing cells in the serpulid polychaete wormPomatoceros caeruleus (1971)
    Springer
    Calcified tissue international 7 (1971), S. 191-200 
    Details
    ISSN: 1432-0827
    Keywords: Serpulid ; Polychaete ; Hydroxyapatite ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Un petit groupe de cellules épithéliales de la surface antérieure du col du serpulidePomatoceros caeruleus contient des vacuoles, remplies de matériel cristallin. Les cristaux présenttent des aspects rhomboédriques ou rectangulaires. La diffraction électronique montre qu'ils sont constitués par de l'hydroxyleapatite et du phosphate de calcium et de magnésium. Les apex des cellules sont bordés de microvillosités. Certaines cellules ont des cils apicaux. Un appareil de Golgi est visible dans le cytoplasme apical. De nombreuses mitochondries sont dissé minées dans le cytoplasme. Le role éventuel de ces cellules, a contenu minéral, dans la mise en réserve de calcium et/ou de phosphore est envisagé.
    Abstract: Zusammenfassung Ein kleiner Zellverband im Epithel der vorderen Oberfläche am Hals des SerpulidsPomatoceros caeruleus enthält membrangebundene Vakuolen, welche mit kristallinem Material gefüllt sind. Die Kristalle haben rhomboide oder rechteckige Formen; mittels Elektronendiffraktion konnte nachgewiesen werden, daß sie aus Hydroxyapatit und Calciummagnesiumphosphat bestehen. Die oberen Enden der Zellen sind von Microvilli eingefaßt. Einige der Zellen haben zudem apikale Zilien. Die Zellen enthalten Golgi-Apparate im apikalen Cytoplasma. Eine große Anzahl von Mitochondrien sind über das, ganze Cytoplasma verteilt. Die mögliche Funktion dieser mineralhaltigen Zellen als Aufbewahrungsorte für Calcium und/oder Phosphor wird besprochen.
    Notes: Abstract A small patch of cells in the epithelium of the anterior surface of the collar of the serpulidPomatoceros caeruleus contains membrane-bound vacuoles filled with crystalline material. The crystals have rhomboidal or rectangular profiles and have been shown by electron diffraction analysis to be composed of hydroxyapatite and calcium magnesium phosphate. The apices of the cells are bordered by microvilli. Some cells also have apical cilia. The cells contain Golgi complexes in the apical cytoplasm. Large numbers of mitochondria are distributed thoughout the cytoplasm. The possible function of these mineral-containing cells as sites for storage of calcium and/or phosphorus is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062606
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  • 4
    Electronic Resource
    Electronic Resource
    A simple spectrophotometric technique for the determination of pentachlorophenol in water (1982)
    Springer
    Bulletin of environmental contamination and toxicology 28 (1982), S. 477-479 
    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/BF01607714
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  • 5
    Electronic Resource
    Electronic Resource
    The toxicity of mercuric chloride and methylmercuric chloride to Fundulus heteroclitus embryos in relation to exposure conditions (1982)
    Springer
    Environmental biology of fishes 7 (1982), S. 277-284 
    Details
    ISSN: 1573-5133
    Keywords: Compound-dependent response ; Duration of exposure ; Embryonic age ; Embryotoxicity ; 96-h LC50 ; Survival potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Embryos in specific stage of the estuarine teleost, Fundulus heteroclitus, were exposed to mercuric chloride (MC) and methylmercuric chloride (MMC) under several distinct treatment conditions. Four-eight cell stage eggs (0-day old) were exposed for 4 days (continuous), 2 days and one day to each mercury compound. One-day old (mid-blastula), 2-day old (mid-neurula) and 5-day old (beating heart) embryos were exposed 4 days to MC and MMC. Mortality for the four days immediately following the initiation of exposure was the embryonic response measured. Under most exposure conditions to the 4–8 cell eggs, progressive and significant reductions in survival were observed at all concentrations above 40 and 30 μgHg++l−1 as MC and MMC, respectively. Reducing the duration of exposure to 1 day most significantly increased the survival potential of the 4–8 cell eggs. For all exposure treatments to the 4–8 cell eggs, significant differences in survival, between eggs exposed to MC and MMC, were determined at 40, 60 and 80 μgHg++l−1, indicating the presence of compound-dependent response differences. In all cases demonstrating response differences between MC and MMC exposed embryos, survival was significantly lower following exposure to MMC. Survival of embryos was progressively increased when the initiation of continuous exposure (4 days) was delayed 1, 2 and 5 days after fertilization. As a result, compound-dependent response differences were progressively shifted to higher He++ concentrations. For both MC and MMC, survival of 1-day old embryos exposed for 4 days was greater than that of 0-day old eggs exposed for 1 day. Of the embryonic stages examined, it appears that the earlier cleavage stages are the most sensitive to mercury intoxication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00002502
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  • 6
    Electronic Resource
    Electronic Resource
    Bioaccumulation of organic micropollutants from sediments and suspended particulates by aquatic animals (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 132-136 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Non-polar organic micropollutants, such as polycyclic aromatic hydrocarbons, polychlorinated biphenyls and some pesticides, which are adsorbed to sediments have a low bioavailability to freshwater and marine animals. Bioaccumulation factors from sediments (concentration in animal/concentration in sediment) of the organic pollutants investigated range from less than 0.1 to about 20, several orders of magnitude lower than bioaccumulation factors from the water for the same compounds. Bioavailability of sediment-adsorbed organic micropollutants is directly related to the solubility of the compound and sediment grain size, and inversely related to sediment organic carbon concentration and animal size. Organic micropollutants adsorbed to sediments are only slightly bioavailable, but sediments in contaminated areas often contain high concentrations of adsorbed pollutants; therefore they represent an important source of contamination of freshwater and marine animals.
    Notes: Zusammenfassung Nicht-polare organische Verunreinigungen, wie polycyclische aromatische Kohlenwasserstoffe, polychlorierte Biphenyle und einige Pesticide, die an Sedimente adsorbiert sind, besitzen eine niedrige Bioverfügbarkeit für Süßwasser- und Seetiere. Die Bioakkumulationsfaktoren aus den Sedimenten (Konzentration im Tier/Konzentration im Sediment) reichen für die untersuchten Verunreinigungen von weniger als 0,1 bis etwa 20, d.h. mehrere Größenordnungen kleiner als die entsprechenden Faktoren aus Wasser. Die Bioverfügbarkeit der an Sediment adsorbierten Verunreinigungen steht im direkten Verhältnis zu der Löslichkeit der Betreffenden Verbindung und der Korngröße des Sediments, und ist umgekehrt proportional zu der Konzentration an organischem Kohlenstoff im Sediment und der Größe des Tieres. Die an Sediment adsorbierten Verunreinigungen sind nur gering bioverfügbar, die Sedimente in kontaminierten Gebieten enthalten aber oft hohe Konzentrationen an Verunreinigungen. Daher stellen die Sedimente eine bedeutende Verunreinigungsquelle für Süßwasser- und Meerestiere dar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00584674
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  • 7
    Electronic Resource
    Electronic Resource
    Ultrastructural studies of the secretion of calcium carbonate by the serpulid polychaete worm, Pomatoceros caeruleus (1971)
    Springer
    Cell & tissue research 120 (1971), S. 160-186 
    Details
    ISSN: 1432-0878
    Keywords: Calcium carbonate ; Calcium secretion ; Serpulid ; Pomatoceros
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Pomatoceros caeruleus possesses a pair of simple acinar calcium-secreting glands lying in the ventral peristomium. Each gland has a single large secretory acinus containing columnar secretory cells with basal nuclei. Golgi complexes and flattened cisternae of the rough endoplasmic reticulum are abundant in the midregion and secretory vacuoles fill the apical cytoplasm. Elongate microvilli extend from the apices of the cells into the gland lumen. An organelle-free zone, the intracellular channel, extends from near the base almost to the apex of the cells. It is bordered on one side by the lateral cell membranes and is separated from the organelle compartment by elongate profiles of the rough endoplasmic reticulum. The secretory products of the calcium-secreting glands have the form of cubic or rhombohedral granules with average dimensions of 150–200 mμ on a side. The granules are composed of a fibrous organic matrix in which needle-like calcite crystals are deposited. The possible mode of synthesis of the calcified secretory granules is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335534
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