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  • Polyethyleneimine (PEI) cellulose  (4)
  • Biochemistry and Biotechnology  (2)
  • Cellulose phosphate  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Thin-Layer chromatography of inorganic ions on cellulose phosphate in sulfuric acid-organic solvent media (1985)
    Springer
    Chromatographia 20 (1985), S. 364-366 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography ; Cellulose phosphate ; Inorganic ions ; Sulfuric acid-organic solvent media
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Thin-layer chromatographic behavior of 49 inorganic ions on cellulose phosphate (P-cellulose) has systematically been surveyed with binary solvent mixtures consisting of sulfuric acid and an organic solvent such as methanol or acetone. The Rf values of many bivalent and monovalent ions as well as Te(VI) decrease on the P-cellulose layer with an increasing concentration of the organic solvent. Polyvalent ions which form strong phosphato-complexes and precipitate insoluble sulfate are strongly retained on P-cellulose. Oxy-anions, Au(III) and Pt(IV) are not adsorbed on the cellulose to any great extent. Feasibilities of the separation of multicomponent mixtures are demonstrated on the P-cellulose layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269063
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  • 2
    Electronic Resource
    Electronic Resource
    Separation of rhenium by thin-layer chromatography with polyethyleneimine cellulose in hydrochloric acid media (1986)
    Springer
    Chromatographia 21 (1986), S. 708-710 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography ; Polyethyleneimine (PEI) cellulose ; Separation of 49 inorganic ions ; Re(VII) separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The thin-layer chromatographic behavior of 49 inorganic ions on polyethyleneimine (PEI) cellulose has been investigated in hydrochloric acid media (0.01–1.0 mol dm−3). The sorption on the cellulose decreases with increasing acid concentration for most of the ions, but As(III), Ti(IV) and Te(VI) do not exhibit any Rf variation with the acid concentration. The Rf spectra of TI(I), Cd(II), Pb(II) and Zn(II) have a maximum. Ag(I), Bi(III), Nb(V), Ta(V), Mo(VI) and W(VI) are retained tightly on the layer, due to either insoluble salt formation or extensive hydrolysis. The extremely low Rf values of Hg(II), Pd(II), Au(III), Ru(III) and Pt(IV) are accounted for by stability of their chlorocomplexes. Re(VII) distributes chromatographically, having moderate Rf values between 0.3 and 0.6, so that the selective separation of Re(VII) from the other ions is feasible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02313685
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thin-layer chromatography of inorganic ions on polyethyleneimine cellulose in sulfuric acid and acid-ammonium sulfate media (1986)
    Springer
    Chromatographia 21 (1986), S. 175-178 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography ; Polyethyleneimine (PEI) cellulose ; Inorganic ions ; Sulfuric aicd-sulfate media
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The thin-layer chromatographic behavior of 49 inorganic ions on polyethyleneimine (PEI) cellulose, a weakly basic anion-exchanger, has been systematically studied in sulfuric acid and ammonium sulfate media (both 0.01–1.0 moldm−3). The sorption on the cellulose decreases with increasing concentration of the acid or sulfate for most of the ions and to a lesser extent for Hg(II), Bi(III), Th(IV), Nb(V), and U(VI). The Rf values of Pd(II), Ru(III), Au(III), Pt(IV), and Ta(V) are extremely low in both systems. Ba(II), Pb(II), Sb(III), Mo(VI), and W(VI) are also strongly retained on the layer. Oxy-anions such as As(III) and Se(VI) are not adsorbed on the cellulose to any great extent, but Re(VII) distributes on the plate with a Rf value of about 0.5. The characteristic retention on PEI-cellulose layer of several polyvalent ions, which form anionic sulfato complexes, can be observed in ammonium sulfate media. Possibilities for separations of analytical interest are also demonstrated in both systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311749
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  • 4
    Electronic Resource
    Electronic Resource
    Thin-layer chromatography of inorganic lons phosphate on cellulose in acetic acid and in acetic acid-ammonium acetate media (1980)
    Springer
    Chromatographia 13 (1980), S. 119-121 
    Details
    ISSN: 1612-1112
    Keywords: Chromatography, thin-layer ; Cellulose phosphate ; Acetate eluent ; Inorganic ion ; Separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Systematic study for the chromatographic behaviour of 49 inorganic ions has been carried out on cellulose phosphate layer in acetic acid and acetic acid — ammonium acetate media. Feasibilities for the effective separations of analytical interest are demonstrated on the 0.25 mm layer in both media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02263065
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  • 5
    Electronic Resource
    Electronic Resource
    Chromatography of inorganic ions on polyethyleneimine cellulose layer in hydrochloric acid — Ammonium thiocyanate media (1987)
    Springer
    Chromatographia 23 (1987), S. 648-650 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography ; Polyethyleneimine (PEI) cellulose ; Inorganic ions ; Hydrochloric acid — thiocyanate media
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Thin-layer chromatographic behavior of 58 inorganic ions on polyethyleneimine (PEI) cellulose has been systematically surveyed in hydrochloric acid — ammonium thiocyanate media. In this media most of the ions distribute chromatographically on the layer. Ag(I), Hg(II), Pd(II), Au(III), Bi(III), Ru(III), Pt(IV), Nb(V), Ta(V), Mo(VI), and W(VI) are strongly retained, while alkali earths(II), Mg(II), As(III), Ti(IV), and Te(VI) are not absorbed to any great extent in this system. An interesting correlation was found between the Rf values on PEI-cellulose in the thiocyanate media and the paramagnetic moment of the rare earths(III). An oddeven fluctuation against the atomic number is also found for the heavy rare earths(III). Chromatographic separation of many inorganic ions of analytical interest is demonstrated in this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311492
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Thin-layer chromatography of inorganic ions on polyethyleneimine cellulose in mixed sulfuric acid — Organic solvent media (1989)
    Springer
    Chromatographia 28 (1989), S. 620-622 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography (TLC) ; Polyethyleneimine (PEI) cellulose ; Sulfuric acid — organic solvent ; Inorganic ions ; Separations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Thin-layer chromatographic behavior of 49 inorganic ions has been systematically studied on polyethyleneimine (PEI) cellulose with solvent mixtures consisting of sulfuric acid and either methanol or acetone. The sorption of most ions on the cellulose increases with increasing methanol content in the solvent. The feature is noticeable for some ions which form sulfato complexes. The Rf values of Re(VII) slightly increase with increasing methanol content. Ba(II), Hg(II), Pb(II), Pd(II), Au(III), Bi(III), Ru(III), Sb(III), Pt(IV), Mo(VI) and W(VI) are strongly retained on the layer in methanol media. The behavior of most ions in the acetone system does not appreciably differ from that in the methanol system, but their Rf values are somewhat higher in acetone than in methanol. There are marked differences in the behavior og Hg(II), Au(III), Ru(III) and Re(VII) between the two systems. Feasibilities for the separation of many ions of analytical interest are also demonstrated in these systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260690
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  • 7
    Electronic Resource
    Electronic Resource
    Hydrocarbon fermentations using Candida lipolytica. I: Basic growth parameters for batch and continuous culture conditions (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 13 (1971), S. 741-760 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Candida lipolytica (strain ATCC 8661) was grown on a simple defined medium with n-dodecane as sole carbon source under batch and continuous fermentation conditions. The composition of cellular material recovered from the fermentations, the oxygen demand of the cells, and the effect of operating conditions on cell growth were evaluated experimentally. These basic data are presented and discussed.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260130603
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  • 8
    Electronic Resource
    Electronic Resource
    Hydrocarbon fermentations using Candida lipolytica. II: A model for cell growth kinetics (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 13 (1971), S. 761-778 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A mechanistic model is presented for the growth kinetics of a yeast grown by submerged aerobic fermentation using a liquid hydrocarbon as sole carbon source. The model is based on the assumption that cell growth is governed by the extent of probable cell attachment at the hydrocarbon oil-droplet surfaces in a four-phase dispersion. An analytical expression has been developed for the model. It is shown that for the case of relatively small oil droplets, the model predicts the present and previous experimental data for growth of yeasts (Candida species) in n-alkane systems. The model is further examined for maximal growth in terms of substrate dilution rate and agitation power consumption for a continuous fermentation process.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260130604
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    Paper (German National Licenses)
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