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  • Electronic Resource  (13)
  • Polymer and Materials Science  (7)
  • Field-flow fractionation  (3)
  • isoflavan  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Biosynthesis of pterocarpan, isoflavan and coumestan metabolites of Medicago sativa: chalcone, isoflavone and isoflavanone precursors
    Amsterdam : Elsevier
    Phytochemistry 18 (1979), S. 597-602 
    Details
    ISSN: 0031-9422
    Keywords: 9-O-methylcoumestrol. ; Leguminosae ; Medicago sativa ; biosynthesis ; coumestan ; coumestrol ; demethylhomopterocarpin ; isoflavan ; lucerne ; phytoalexin ; pterocarpan ; sativan ; vestitol
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)84267-3
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  • 2
    Electronic Resource
    Electronic Resource
    Biosynthesis of pterocarpan and isoflavan phytoalexins in Medicago sativa: the biochemical interconversion of pterocarpans and 2'-hydroxyisoflavans
    Amsterdam : Elsevier
    Phytochemistry 18 (1979), S. 591-596 
    Details
    ISSN: 0031-9422
    Keywords: Leguminosae ; Medicago sativa ; Trifolium pratense ; biosynthesis ; demethylhomopterocarpin ; isoflavan ; lucerne ; phytoalexin ; pterocarpan ; red clover ; sativan ; vestitol.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)84266-1
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  • 3
    Electronic Resource
    Electronic Resource
    Biosynthesis of pterocarpan, isoflavan and coumestan metabolites of Medicago sativa: The role of an isoflav-3-ene
    Amsterdam : Elsevier
    Phytochemistry 19 (1980), S. 2341-2346 
    Details
    ISSN: 0031-9422
    Keywords: 9-O-methylcoumestrol. ; Leguminosae ; Medicago sativa ; biosynthesis ; coumestan ; demethylhomopterocarpin ; isoflavan ; lucerne ; phytoalexin ; pterocarpan ; sativan ; vestitol
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)91023-9
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  • 4
    Electronic Resource
    Electronic Resource
    Retention in field-flow fractionation with secondary chemical equilibria (1992)
    Springer
    Chromatographia 34 (1992), S. 325-330 
    Details
    ISSN: 1612-1112
    Keywords: Field-flow fractionation ; Secondary chemical equilibria ; Colloidal systems ; Retention theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The application range of field-flow fractionation (FFF) can be extended to low molecular weight solutes, as demonstrated a few years ago by Berthod et al., by taking profit of secondary chemical equilibria (SCE) occurring between the bulk carrier and a retained carrier component. The theory of solute retention in this SCE-FFF method is developed for any value of the solute distribution coefficient and of the retention ratio of the retained carrier component, provided that the Brownian mode of retention applies for this component and that the flow velocity profile is parabolic. This removes some of the limitations of the model previously developed by Berthod and Armstrong and sheds light on the potentialities of the SCE-FFF method for physico-chemical studies about secondary chemical equilibria in colloidal systems. Remaining assumptions in the model are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268363
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of stereoregular polygluconamides from D-glucose and D-glucosamine (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 299-305 
    Details
    ISSN: 0887-624X
    Keywords: polygluconamides ; stereoregular polyamides ; stereoregular nylons ; chiral polyamides ; chiral nylons ; aminoaldonic acids ; sugar polyamides ; carbohydrate monomers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two stereoregular polygluconamides, one (3) of polypeptide-type and the other (16) being a polycaproamide containing four stereocenters in the main chain of the repeating unit, have been prepared from D-glucosamine and D-glucose, respectively. The new polyamides were characterized by elemental analysis, and IR, 1H- and 13C-NMR spectroscopies. The molecular weights for 3 and 16 were estimated as 25,000 and 67,000, respectively, on the basis of viscosimetric measurements. Both polyamides display high optical activity; they are highly hydrophilic and readily soluble in water as well as in a variety of organic solvents including chloroform. Polyamide 16 is highly crystalline and yields resistant films with spherulitic texture. © 1995 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080330211
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  • 6
    Electronic Resource
    Electronic Resource
    Polymer analysis by fractionation with on-line light scattering detectors (1982)
    Springer
    Chromatographia 15 (1982), S. 426-432 
    Details
    ISSN: 1612-1112
    Keywords: Polymer analysis ; Molecular weight distribution ; Steric exclusion chromatography ; Field-flow fractionation ; Light scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The classical method for the determination of the molecular weight distribution (MWD) curve of a polymer requires fractionation according to the molecular weight and prior calibration of the separator. It is shown that the use of a dual detection system which includes a molecular mass sensitive detector eliminates the need for prior calibration. The principles of operation of a low-angle light scattering photometer, working as such a detector, are presented, as well as the basic equations for determination of the MWD curve from the elution curve and of the average molecular weights. Then the performances of the light scattering photometer are discussed with special emphasis on the various sources of errors and unaccuracies in these determinations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261602
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  • 7
    Electronic Resource
    Electronic Resource
    Comparison of approximate and exact description of isoviscous flow velocity profile formed in rectangular cross-section channel for field-flow fractionation (1992)
    Springer
    Chromatographia 33 (1992), S. 284-286 
    Details
    ISSN: 1612-1112
    Keywords: Field-flow fractionation ; Three-dimensional flow velocity profile ; Rectangular cross-section channel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The shape of the velocity profile established in a carrier liquid flowing in a duct of rectangular cross-section under conditions of isoviscous flow is well known and can be calculated by using an approximate or the exact solution of Navier-Stokes equation. The series evaluated when applying the exact solution were found to converge very rapidly. Consequently, computing can be substantially shortened without loss of accuracy by summing only the first three terms of the series. A fair agreement between the approximate solution of Takahashi and Gill and the exact solution was obtained for all practically applicable aspect ratios of the separation channels used in field-flow fractionation. This conclusion is of interest when calculating various separation parameters in three-dimensional channels for field-flow fractionation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02276196
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  • 8
    Electronic Resource
    Electronic Resource
    Oxidation der Pb-Ca-Legierungen in flüssigem Zustand (1978)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 29 (1978), S. 815-820 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Oxidation of PbCa alloys in the liquid stateThe effect of various temperatures, the composition of the alloy and the corroding atmosphere is studied with a thermobalance during the oxidation of molten PbCa alloys. The rate controlling step of the oxidation depends on the test conditions. The results obtained at 700°C are in agreement with data found in literature and according to which the oxidation increases with the Ca content; in this range calcium is subject to preferential oxidation. At 600°C and temperatures below that the addition of calcium does not only not increase oxidation but may give rise to a decrease.
    Notes: Mit einer Thermowaage wird die Wirkung verschiedener Temperaturen, der Zusammensetzung der Legierung und der Zusammensetzung der angreifenden Atmosphäre bei der Oxidation geschmolzener Pb-Ca-Legierungen untersucht. Der geschwindigkeitsbestimmende Schritt der Oxidation hängt von den Versuchsbedingungen ab. Bei 700°C bestätigen die bei der vorliegenden Untersuchung erhaltenen Ergebnisse die Literaturangaben, wonach die Oxidation bei zunehmendem Ca-Gehalt ansteigt; dabei wird das Calcium vorzugsweise oxidiert. Dagegen wird bei 600°C und darunter die Oxidation durch Zusatz von Calcium nicht nur nicht verstärkt, sondern sogar verringert.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19780291206
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  • 9
    Electronic Resource
    Electronic Resource
    Electrochemical study of iproniazid and its analytical determination by differential pulse polarography (1994)
    Weinheim : Wiley-Blackwell
    Electroanalysis 6 (1994), S. 491-496 
    Details
    ISSN: 1040-0397
    Keywords: Iproniazid ; Differential pulse polarography ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Iproniazid was found to be irreversibiy reduced in two steps, involving the exchange of two electrons and two protons each, by using tast polarography, normal pulse polarography (NPP), and cyclic voltammetry (CV). The rate constants of these two steps were found to be 5.8 × 10-6 and 4.2 × 10-6 and 4.2 × 10-6 cm s-1, respectively, and their corresponding diffusion coefficients 4.5 × 10-5 and 8.3 × 10-5 cm2 s-1, Also, α, the coefficient of cathodic transfer, was found to be 0.20 to 0.25 for the first peak and 0.17 to 0.15 for the second. On the basis of the electrochemical study performed, a differential pulse polarographic method for the determination of iproniazid over the concentration range of 5 × 10-7 M to 1 × 10-4 M was developed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140060522
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Fluiddynamik des Steigrohrs eines katalytischen Crackers (FCC) (1995)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 67 (1995), S. 1092-1093 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330670919
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