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  • Articles: DFG German National Licenses  (23)
  • Chemistry  (21)
  • n-6 fatty acids  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of n-3 and n-6 fatty acids on hepatic microsomal lipid metabolism: a time course study (1992)
    Springer
    Molecular and cellular biochemistry 116 (1992), S. 153-161 
    Details
    ISSN: 1573-4919
    Keywords: Delta 9 desaturase ; eicosapentaenoic acid ; gamma-linolenic acid ; octadecenoic acids ; n-3 fatty acids ; n-6 fatty acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The present study examines the time dependent effects of n-6 and n-3 polyunsaturated fatty acids on liver microsomal lipid metabolism in FVB mice fed a diet supplemented with a mixture of free fatty acids (mainly 18:3n-6 and 20:5n-3) at 25 mg/g diet. Significant changes in the fatty acid composition of total liver and microsomal lipids were observed after 7 days on the diets. Thereafter, some animals remained on the same diet while others were fed a diet supplemented with hydrogenated coconut oil (HCO). With the exception of 20:5n-3 which showed a slower recovery, establishment of the HCO pattern was rapid indicating that the diet-induced changes could be easily reversed. The unsaturation index, the cholesterol/phospholipid ratio and the microviscosity of the microsomal membranes were not affected by these dietary manipulations. Unsaturated fatty acid supplementation reduced the activity of Δ9 desaturase by 50%. Feeding the HCO diet to mice previously fed the EPA/GLA diet led to a progressive increase in Δ9 desaturase activity, reaching 80% of the day zero values after 14 days. The monoene content of hepatic total lipids reflected, in most cases, the changes in enzyme activity. This study shows that a low dose of a n-3 and n-6 free fatty acid mixture increases the quantities of members of the n-3 family, without loss of n-6 fatty acids in microsomal membranes and modifies the activity of Δ9 desaturase without altering the microsome physicochemical parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299394
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of saturated fatty acids on n-6 fatty acid metabolism in cultured human monocyte-like cells (U937) (1993)
    Springer
    Molecular and cellular biochemistry 122 (1993), S. 49-58 
    Details
    ISSN: 1573-4919
    Keywords: n-6 fatty acids ; Δ5 desaturation ; incorporation ; peroxides ; cytotoxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Effects of supplementation of saturated fatty acids (16:0 and 18:0) on metabolism of the cytotoxic n-6 fatty acids in cultured human monocyte-like cells (U937) have been examined. U937 cells were incubated in 5% delipidated fetal bovine serum containing 16:0 and 18:0. Supplementation of either 16:0 or 18:0 has no significant effect on the uptake of 18:2n-6 and 18:3n-6. However, addition of 16:0 to the medium increased whereas 18:0 suppressed the cytotoxic effects of 18:2n-6 and 18:3n-6. In addition, 16:0 supplementation reduced the incorporation of n-6 fatty acids in cellular phospholipid fraction, and enhanced the metabolism of n-6 fatty acids, particularly the conversion of 20:3n-6 to 20: 4n-6 in U937 cells. Results with microsomes prepared from U937 cells also showed that 16:0 supplementation increased the Δ5 desaturase activity. This may be related in part to an increase in the availability of 20:3n-6, since results obtained in a separate study have shown that 16:0 competed with 20:3n-6 for incorporaton into the phospholipid molecule at sn-2 position. Increasing the availability and formation of long chain n-6 fatty acids, which are cytotoxic, might also be responsible for increasing cytotoxicity of 16:0 supplementation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00925736
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A free radical copolymerization model for simulating reactive processing of unsaturated polyester resins (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 684-692 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A free radical copolymerization model is proposed for simulating the reaction rates and conversions of styrene monomer and unsaturated polyester resins during curing. This model is based on film theory in which the rate constants reflect both reaction and diffusion resistances. Differential scanning calorimetry in combination with Fourier transform infrared spectroscopy is used to measure the overall and individual reactivities of reacting species. Model parameters are determined from experimental data. The applicability of this model is demonstrated in a cure simulation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760301108
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Phosphorylation of yeast protein: Reduction of ribonucleic acid and isolation of yeast protein concentrate (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 28 (1986), S. 1690-1698 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Yeast nucleoproteins were chemically phosphorylated with phosphorus oxychloride (POCL3). Studies using 31P nuclear magnetic resonance (NMR) spectroscopy, stability to pH and lysine estimation all indicated that the ∊-amino group of lysine was the principal functional group phosphorylated. Phosphorylation of ca. 30% of the lysine residues resulted in removal of more than 85% of contaminant ribonucleic acid from protein precipitated at pH 4.2. Phosphorylation did not alter the amino acid composition of yeast proteins and was reversible under acidic conditions. Based on the data, a method for the preparation of phosphorylated yeast protein with low levels of nucleic acid is proposed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260281112
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  • 5
    Electronic Resource
    Electronic Resource
    Drop formation in air prior to jetting (1989)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 35 (1989), S. 1572-1574 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690350922
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  • 6
    Electronic Resource
    Electronic Resource
    Dispersed phase mass transfer during drop formation under jetting conditions (1977)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 23 (1977), S. 701-714 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A recent design procedure for perforated plate extraction columns requires extension to include jetting conditions at each perforation. For this purpose, correlations are obtained for jet length, jet contraction, drop size, and mass transfer coefficients in disperse phase controlled liquid-liquid systems. Experimental variables include nozzle size, flow velocity, and physical properties.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690230512
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  • 7
    Electronic Resource
    Electronic Resource
    Continuous phase mass transfer during formation of drops from jets (1979)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 25 (1979), S. 80-87 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This study enables the extension of a recent design procedure for perforated plate extraction columns to include operation under jetting conditions. Correlations of experimental data are given for jet length, jet contraction, drop size, and mass transfer rates in continuous phase controlled liquid-liquid systems. Systems exhibiting very low mass transfer rates were used, and this gave significantly different results from those obtained earlier with moderate rates of mass transfer.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690250109
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  • 8
    Electronic Resource
    Electronic Resource
    Kinetics of free radical polymerizations in reactive polymer processing (1985)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 31 (1985), S. 1585-1593 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A kinetic model has been developed for radical chain growth type of reactive polymer processing operations. This model incorporates considerations of the molecular diffusion that is described by a free volume theory and the basic reaction mechanism of the free-radical chain polymerization. Experimental results from the bulk styrene polymerization and a reaction of sheet molding compound (SMC) showed good agreement with the model.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690311002
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  • 9
    Electronic Resource
    Electronic Resource
    Formation and textures of ethyl-cyanoethyl cellulose/acrylic acid mesophase (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 607-613 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The formation, textures, and optic characteristics of the ethyl-cyanoethyl cellulose [(E-CE)C]/acrylic acid (AA) mesophase were studied using polarizing microscopy, spectro-photometry, and small-angle light scattering (SALS). The disklike, oily streak, planar, pseudoisotropic, polygonal textures and the texture of domains gathered randomly were observed in the mesophase. The polygonal texture in unitary mesomorphic solutions can be regarded as the texture from the combination of deformed mesophase aggregates with the disclike texture. The mesomorphic solution exhibits vivid colors when the concentration is about 42-52 wt % because of its selective reflection to visible light. The wavelength of the light that is selectively reflected shifts to the shorter wavelength, with increasing concentration. © 1993 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070500405
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  • 10
    Electronic Resource
    Electronic Resource
    Preparation and structures of ethyl-cyanoethyl cellulose/cross-linked polystyrene composites (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 54 (1994), S. 533-540 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Ethyl-cyanoethyl cellulose [(E-CE)C]/cross-linked polystyrene (PS) composites were prepared via polymerization of styrene in (E-CE)C/styrene solution with glycol diacrylate as a cross-linking reagent. The polymerization of the solution, morphology, and miscibility of (E-CE)C/PS composites were studied with polarizing microscopy, small-angle light scattering (SALS), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). It was found that the mixing state of the (E-CE)C/PS system and the thermal stability of composites were modified by cross-linking of PS. In the intensively cross-linked composite prepared from the anisotropic solution, there existed cylindrical domains in which (E-CE)C spherulites were dispersed in PS. © 1994 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070540503
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