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  • 1
    Electronic Resource
    Electronic Resource
    Metabolic adjustments in the common carp during prolonged hypoxia (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 57 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Biochemical and respiratory changes in the common carp Cyprinus carpio, were studied 6, 24, 96 and 168 h upon exposure to hypoxia (0·5 mgO2 l−1). Modification of kinetic properties of phosphofructokinase (PFK-1), coupled with a decreased in PFK-1 activities, were evident in muscle. No changes in kinetics and activities could be observed in muscle pyruvate kinase (PK) and lactate dehydrogenase (LDH). A decrease in muscle citrate synthase (CS) and an increase in muscle cytochrome c oxidase (CCO) were found. The common carp was able to maintain a constant level of muscle glycogen, muscle ATP, and liver CS throughout the 168-h experimental period. Changes in activities of liver LDH and muscle CCO were observed only at 168 h, which indicates that common carp may switch to alternative metabolic pathway to deal with prolonged hypoxia. A severe decrease in liver glycogen was accompanied by increases in lactate levels in both the muscle and liver. Oxygen consumption rate was reduced under hypoxia, but resumed to normoxic levels within 2 h upon return to normoxic condition. Overall, these results indicate that carp adopt different strategies in an attempt to deal with short term and long term hypoxia in the natural environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb00478.x
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  • 2
    Electronic Resource
    Electronic Resource
    Cytological and Biochemical Alterations in Carassius auratus Hepatocytes from Exposure to Sediment Containing Dioxins and Related Compounds (1999)
    Springer
    Archives of environmental contamination and toxicology 37 (1999), S. 358-363 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. Cytological and biochemical alterations of crucial carp (Carassius auratus) hepatocytes were characterized after exposure to sediments from a lake contaminated with dioxins and other industrial chemicals. Carp were exposed in 20 L water containing 25, 50, or 100 g of contaminated sediment for 2 and 4 weeks. Ultrastructural changes in the liver were characterized by severe enlargement of hepatocytes. Alterations in the cell included formation of condensed and irregular cell nucleus, polynuclei, dispersed heterochromatin, enlargement of the nucleolus, and degeneration of the nucleus. Mitochondrial numbers were reduced and cristae were deformed. Myelin figures and lysosomes were increased, and sometimes cell organelles and cell matrix were totally lost after 4 weeks of exposure. The ultrastructural alterations were correlated with exposure time and sediment concentrations. Hepatosometic index was significantly increased in experimental groups at 2 and 4 weeks as compared with the control group. EROD enzyme activities were strongly induced in liver. A trend from rough endoplasmic reticulum (RER) to SER was observed. Our results suggest that the dioxin-like compounds bound by sediment were bioavailable to C. auratus and cause sublethal effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449900525
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  • 3
    Electronic Resource
    Electronic Resource
    Description of isovector giant dipole resonances in relativistic Vlasov equation at small amplitude limit (1995)
    Springer
    The European physical journal 352 (1995), S. 119-126 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 24.30.Cz ; 24.10Jv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A more general relativistic Vlasov equation has been derived in the framework of relativistic quantum hadron dynamical theory. In the small amplitude limit we use this Vlasov equation to study the isovector giant dipole resonances built on groundstate in spherical nuclei16O,40Ca,90Zn and208Pb. The results show that the spin-orbit coupling and the non-linear terms of scalar meson can influence the resonance energies to a certain extent comparing with those obtained from the non-relativistic Vlasov equation approach and are in good agreement with the experimental ones, especially for the case which vacuum fluctuation is included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01298896
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of two oil dispersants on phototaxis and swimming behaviour of barnacle larvae (1997)
    Springer
    Hydrobiologia 352 (1997), S. 9-16 
    Details
    ISSN: 1573-5117
    Keywords: Oil dispersant ; phototaxis ; swimming behaviour ; barnacle larvae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of two oil dispersants (Vecom B-1425 GL and Norchem OSD-570) mixed with diesel oil on the survival and behaviour of the stage II nauplii of the barnacle Balanus amphitrite were investigated. The24 and 48-hour LC50 values for Vecom B-1425 GL:diesel mixture were 514 and 48 mg l−1 respectively, while respective values for Norchem OSD-570:diesel mixture were 505 and 71 mg l−1. Under sublethal concentrations, increased levels of the dispersant:diesel mixtures caused a reduction in phototactic responses. Balanus amphitrite nauplii failed to exhibit phototactic responses when exposed to Vecom B-1425GL:diesel mixtures of 400 mg l−1 and higher for 24 hours. A longer exposure time of 48 hours further reduced the Lowest Observable Effect Concentrations (LOECs) to 60 mg l−1. The LOECs for Norchem OSD-570:diesel mixtures under exposure periods of 24 and 48 hours were 400and 80 mgl−1 respectively. The curvilinear velocities (VCL) and straight-line velocities (VSL) of the stage II nauplii ranged from 0.7–1.1and 0.2-0.4 mms−1 respectively. Increased concentrations of dispersant:diesel mixtures caused a significant change in the curvilinear and straight-line velocities. Both oil dispersants, dispersant:diesel mixtures of 20 to 40 mgl−1 caused significant increases in VCL, but no significant change in VSL. Dispersant:diesel mixtures of 100 mg l−1 and higher resulted in a reduction in VSL for both dispersants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003024500609
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