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  • 1
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    Cytological and Biochemical Alterations in Carassius auratus Hepatocytes from Exposure to Sediment Containing Dioxins and Related Compounds (1999)
    Springer
    Details
    Publication Date: 1999-10-01
    Print ISSN: 0090-4341
    Electronic ISSN: 1432-0703
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Role of adipocytes in the muscle tissue of Atlantic salmon (Salmo salar ) in the uptake, release and retention of water-soluble fraction of crude oil hydrocarbons (1997)
    Springer
    Marine biology 127 (1997), S. 545-553 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The uptake and depuration of the water-sol‐uble fraction (WSF) of hydrocarbons of crude petroleum by Atlantic salmon (Salmosalar) has previously been examined in terms of whole muscle. The hypothesis that the tainting WSF in the muscle was retained primarily by adipocytes has been investigated by the isolation of adipocytes and the subsequent analysis for hydrocarbons in adipocytes. After 96 h exposure of market-sized Atlantic salmon to 0.2 ppm WSF, adipocytes isolated from the belly flap region of the muscle tissue accumulated 14.3 times more WSF (59.4 ppm) than the dorsal white muscle (4.2 ppm), while 54% of the tainting WSF in the dorsal white muscle was found to be stored in associated adipocytes. When returned to clean seawater, WSF accumulated in the dorsal white muscle was released much faster than that in the adipocytes. These results indicated that the loose association of WSF with the nonlipid portion of white muscle, mainly muscle cells and intercellular fluid, is responsible for the rapid discharge of WSF from the dorsal muscle tissue in the early stages of depuration. After 4 d of depuration, the adipocytes became the principal storage site of residual WSF in white muscle and the depuration of WSF from muscle tissue then reflected the release of WSF from adipocytes in the muscle tissue. After 20 d of depuration, 10.7 ppm of tainting WSF in the form of high molecular weight aromatic hydrocarbons (mainly C4-benzenes, naphthalene and alkylated naphthalenes) were still present in adipocytes, while in the dorsal white muscle only a trace of total WSF was detected. Increases in the number of aromatic rings and the alkylations on the rings enhanced the accumulation and retention of individual hydrocarbons in both adipocytes and white muscle. From these studies we conclude that it is the adipocytes in the muscle tissue which control the actual accumulation and release of hydrocarbons in the whole muscle tissue of Atlantic salmon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050044
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  • 3
    Electronic Resource
    Electronic Resource
    Very long-chain aliphatic hydrocarbons in lipids of mussels (Mytilus edulis) suspended in the water column near petroleum operations off Sable Island, Nova Scotia, Canada (1996)
    Springer
    Marine biology 126 (1996), S. 499-507 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mussels (Mytilus edulis) suspended in the water column in 1994 and 1995 for the monitoring of oil drilling operations off Sable Island, Nova Scotia were examined for hydrocarbon profiles, particularly aliphatic hydrocarbons. A spring bloom of phytoplankton occurred during the 90-d suspension period in 1995. Hydrocarbons isolated from the 1995 suspended mussels showed very high concentrations of both biogenic hydrocarbons and very long-chain n-alkanes from C20 to C32, initially thought to be petrogenic. Both types of hydrocarbons were either not detected or were only present in trace amounts in the mussels suspended in 1994 at similar sites. The biogenic hydrocarbons in the 1995 mussels were apparently of planktonic origin, from the spring bloom, and were dominated by heneicosahexaene (21:6), followed by pristance, heptadecane, and varions monounsaturated and polyunsaturated phytenes, heptadecenes, nonadecenes and heneicosenes. They could be readily hydrogenated to yield the basic alkanes. The 1995 mussels suspended within 1 km from the oil well platform were probably slightly tainted by petrogenic hydrocarbons, as evidenced by the detection of phytane and high concentrations of total aliphatic hydrocarbons, whereas the mussels suspended 10 km from the platform showed only high concentrations of biogenic hydrocarbons and the novel long-chain n-alkanes. The occurrence of an unusual phytoplankton bloom during the suspension period severely interfered with the petroleum monitoring role of mussels by altering the mussel hydrocrbon profiles through the accumulation into and probably selective depuration of xenobiotic hydrocarbons from the mussel, tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354632
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  • 4
    Electronic Resource
    Electronic Resource
    Large-scale molecular dynamics simulations of fracture and deformation (1996)
    Springer
    Journal of computer-aided materials design 3 (1996), S. 183-186 
    Details
    ISSN: 1573-4900
    Keywords: Fracture ; Deformation ; Atomistic simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary We have discussed the prospects of applying massively parallel molecular dynamics simulation to investigate brittle versus ductile fracture behaviors and dislocation intersection. This idea is illustrated by simulating dislocation emission from a three-dimensional crack. Unprecedentedly, the dislocation loops emitted from the crack fronts have been observed. It is found that dislocation-emission modes, jogging or blunting, are very sensitive to boundary conditions and interatomic potentials. These 3D phenomena can be effectively visualized and analyzed by a new technique, namely, plotting only those atoms within the certain ranges of local potential energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185653
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  • 5
    Electronic Resource
    Electronic Resource
    Engineering endoglucanase-secreting strains of ethanologenic Klebsiella oxytoca P2 (1999)
    Springer
    Journal of industrial microbiology and biotechnology 22 (1999), S. 600-607 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: endoglucanase; ethanol; Klebsiella; Erwinia; lignocellulose; biomass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Klebsiella oxytoca P2 was developed as a biocatalyst for the simultaneous saccharification and fermentation (SSF) of cellulose by chromosomally integrating Zymomonas mobilis genes (pdc, adhB) encoding the ethanol pathway. This strain contains the native ability to transport and metabolize cellobiose, eliminating the need to supplement with β-glucosidase during SSF. To increase the utility of this biocatalyst, we have now chromosomally integrated the celZ gene encoding the primary endoglucanase from Erwinia chrysanthemi. This gene was expressed at high levels by replacing the native promoter with a surrogate promoter derived from Z. mobilis DNA. With the addition of out genes encoding the type II protein secretion system from E. chrysanthemi, over half of the active endoglucanase (EGZ) was secreted into the extracellular environment. The two most active strains, SZ2(pCPP2006) and SZ6(pCPP2006), produced approximately 24 000 IU L−1 of CMCase activity, equivalent to 5% of total cellular protein. Recombinant EGZ partially depolymerized acid-swollen cellulose and allowed the production of small amounts of ethanol by SZ6(pCPP2006) without the addition of fungal cellulase. However, additional endoglucanase activities will be required to complete the depolymerization of cellulose into small soluble products which can be efficiently metabolized to ethanol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900666
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  • 6
    Electronic Resource
    Electronic Resource
    Simultaneous Lagrange interpolating approximation need not always be convergent (1994)
    Springer
    Constructive approximation 10 (1994), S. 87-93 
    Details
    ISSN: 1432-0940
    Keywords: 41A05 ; 41A28 ; Simultaneous approximation ; Lagrange interpolation ; Pairwise distinct nodes ; Chebyshev polynomials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Recently, several publications have been devoted to investigation of simultaneous Lagrange interpolating approximation. In this paper we carefully construct a counterexample with a system of nodes showing that the simultaneous Lagrange interpolating approximation need not always be convergent. It is especially interesting to note that the system of nodes behaving “badly” in this case is exactly the “near optimal choice” in the ordinary Lagrange interpolating case, the zeros of the Chebyshev polynomials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01205168
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  • 7
    Electronic Resource
    Electronic Resource
    On a problem of Davison (1992)
    Springer
    Aequationes mathematicae 43 (1992), S. 90-93 
    Details
    ISSN: 1420-8903
    Keywords: 39B05 ; 26E05
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The present note gives an elementary positive answer to a question asked by Davison in the Twenty-seventh International Symposium on Functional Equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01840477
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  • 8
    Electronic Resource
    Electronic Resource
    On a problem of Davison (1991)
    Springer
    Aequationes mathematicae 42 (1991), S. 297-297 
    Details
    ISSN: 1420-8903
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01818499
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  • 9
    Electronic Resource
    Electronic Resource
    On Müntz rational approximation (1993)
    Springer
    Constructive approximation 9 (1993), S. 435-444 
    Details
    ISSN: 1432-0940
    Keywords: 41A20 ; 41A30 ; Rational combinations ; Müntz system ; Monotone approximation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract One of the main results of the present paper shows that, for any sequence of real numbers {λn} with infinitely many distinct elements, the monotone rational combinations of {Xλn} always form a dense set in the uniform norm in the subspace of monotone functions fromC [0, 1].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01204650
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  • 10
    Electronic Resource
    Electronic Resource
    Plastic bags for stable storage of the water-soluble fraction of crude petroleum used in aquatic environment toxicity and tainting studies (1995)
    Springer
    Bulletin of environmental contamination and toxicology 55 (1995), S. 597-602 
    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/BF00196041
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