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  • 1
    Electronic Resource
    Electronic Resource
    Recognition of amino acids by membrane potential and circular dichroism of immobilized albumin membranes (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 2025-2032 
    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 shifts in membrane potential, caused by the injection of some amino acids into a permeation cell, were measured using immobilized serum albumin membranes at isoelectric points of the amino acids. The effective fixed charge density was estimated to decrease after the injection of alamine, phenylalanine, and tryptophan and to increase after the injection of serine. The change in the fixed charge density originated from the conformational change of the immobilized albumin membranes induced by the binding between the albumin and amino acids in the membranes, since the conformational change of the immobilized albumin membranes induced by the binding of the amino acids to the serum albumin was observed from circular dichroism measurements. There was found, however, some discrepancy between the conformational change of the serum albumin in the albumin membranes detected by the membrane potential measurements and the circular dichroism measurements. This is explained by the fact that the circular dichroism measurements detect the increase or decrease in the α-helix, β sheet, and random coil contents; however, they do not always contribute to the detection of the change in the charge density due to the presence of the amino acid in the albumin membranes. © 1995 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070581113
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  • 2
    Electronic Resource
    Electronic Resource
    Biologically active glycosides from asteroidea, III. Steroid oligoglycosides from the starfish Acanthaster planci L., 2. Structures of two newly characterized genuine sapogenins and an oligoglycoside sulfate (1983)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 37-55 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Biologisch Aktive Glycoside aus Asteroidea, III1,-Steroid-Oligoglycoside aus dem Seestern Acanthaster planci L., 2 -Strukturen von zwei neu charakterisierten genuinen Sapogeninen und einem Oligoglycosid-sulfatAus Seesternen (Acanthaster planci L.) wurde ein labiles Glycosid-Sulfat vom Typ 20-Hydroxycholesten-23-on in großen Mengen zur Strukturaufklärung isoliert. Abgesehen von dem bekannten 3β,6α-Dihydroxy-5α-pregn-9(11)-en-20-one (1) wurden erstmalig zwei neue genuine Aglyca bei der enzymatischen Hydrolyse der rohen Oligoglycosidfraktion isoliert. Auf Grund der chemischen und spektrometrischen Untersuchungen ließen sich die Strukturen als 3β,6α,20ξ-Trihydroxy-5α-cholest-9(11)-en-23-one (2) und 3β,6α,20ξ-Trihydroxy-5α-cholesta-9(11),24-dien-23-one (3) festlegen. Die Struktur eines als Acanthaglycosid A benannten neuen Pentaglycosid-Sulfats wurde als 3β-Natriosulfonatooxy-6α,20ξ-dihydroxy-23-oxo-5α-cholesta-9(11),24-dien-6α-yl-O-β-D-fucopyranosyl-(1→2)-O-β-D-quinovopyranosyl-(1→4)-O-[β-D-quinovopyranos-yl-(1→2)]-O-β-D-xylopyranosyl-(1→3)-O-β-D-quinovopyranosid identifiziert. Neben den konventionellen analytischen Methoden wurde erstmals die Fast-atom-bombardment-Massenspektrometrie (FAB-MS) für die Bestimmung und Absicherung der Struktur der natürlich vorkommenden Oligoglycosid-Sulfate benutzt
    Notes: From the whole bodies of Acanthaster planci L. a genuine oligoglycoside which is an unstable type 20-hydroxycholesten-23-one glycoside sulfate has been isolated in large quantities. Apart from the known 3β,6α-dihydroxy-5α-pregn-9(11)-en-20-one (1) two new genuine aglycones were isolated by enzymatic hydrolysis of the crude oligoglycoside fraction for the first time. The structures were identified by chemical and spectroscopic evidence to be 3β,6α,20ζ-trihydroxy-5α-cholest-9(11)en-23-one (2) and 3β,6α,20ξ-trihydroxy-5α-cholesta-9(11),24-dien-23-one (3), respectively. The structure of the newly characterized pentaglycoside sulfate Acanthaglycoside A was then determined to be 3β-sodiosulfonatooxy-6α,20ξ-dihydroxy-23-oxo-5α-cholesta-9(11),24-dien-6α-ylO-β-D-fucopyranosyl-(1→2)-O-β-D-quinovopyranosyl-(1→4)-O-[β-D-quinovopyranosyl-(1→2)]-O-β-D-xylopyranosyl-(1→3)-O-β-D-quinovopyranoside (4). Apart from conventional analytical methods, fast atom bombardment mass spectrometry (FAB-MS) was successfully used for the first time for determination and confirmation of the structure of the natural oligoglycoside sulfate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198319830107
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  • 3
    Electronic Resource
    Electronic Resource
    Amorphous molecular materials: Synthesis and properties of a novel starburst molecule, 4,4′,4″ -Tri(N-phenothiazinyl)triphenylamineThis work was supported by a Grant-in-Aid for Scientific Research (No. 02 205 084) from the Ministry of Education, Science and Culture. (1991)
    Weinheim : Wiley-Blackwell
    Advanced Materials 3 (1991), S. 549-550 
    Details
    ISSN: 0935-9648
    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
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19910031105
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  • 4
    Electronic Resource
    Electronic Resource
    Biologically active glycosides from asteroidea, XXXII. Glycosphingolipids from the starfish Astropecten latespinosus, 2. Structure of two new ganglioside molecular species and biological activity of the ganglioside (1995)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 545-550 
    Details
    ISSN: 0947-3440
    Keywords: Glycosphingolipids ; Gangliosides ; Starfish ; Astropecten latespinosus ; Antitumor activity ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two ganglioside molecular species [LG-1 (1) and LG-2 (5)] have been obtained from the water-soluble lipid fraction of the chloroform/methanol extract of the starfish Astropecten latespinosus. On the basis of chemical and spectroscopic findings, the structure of 1 and 5 have been elucidated. They are new ganglioside molecular species. Negative FAB mass spectrometry provided important information both on the structure of the sugar moiety and on the molecular mass of the gangliosides. Partial hydrolysis by hot water has proved useful for structure elucidation of the complex oligosaccharide moieties. In addition, the major ganglioside molecular species, LG-2 (5), shows antitumor activity against murine lymphoma L1210 cells in vitro.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199519950374
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  • 5
    Electronic Resource
    Electronic Resource
    Biologically Active Glycosides from Asteroidea, 36. Re-examination of the Structure of Acanthaganglioside C, and the Identification of Three Minor Acanthagangliosides F, G and H (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 931-936 
    Details
    ISSN: 0947-3440
    Keywords: Gangliosides ; Acanthagangliosides ; Starfish ; Acanthaster planci ; N M R spectroscopy ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The structure of acanthaganglioside C (1) has been re-examined using MQ-COSY, TOCSY, NOESY, HSQC, HMBC and HSQC-TOCSY experiments. As a result, it is clarified that N-acetyl neuraminic acid (NeuAc) is linked to the C-3 position, and not the C-4 position, of the β-galactopyranose. In addition, three minor acanthagangliosides, F (2), G (3) and H (4), have also been isolated from the ganglioside molecular species AG-2. Their structures have been determined on the basis of chemical and spectroscopic evidence.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970522
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  • 6
    Electronic Resource
    Electronic Resource
    Infrared spectroscopic studies of CO2 sorbed in glassy and rubbery polymeric membranes (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 149-157 
    Details
    ISSN: 0887-6266
    Keywords: membrane ; dual-mode sorption ; infrared spectroscopy ; carbon dioxide ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Infrared spectra of CO2 sorbed in rubbery and glassy polymers were measured to examine the relationships between the spectroscopic data and physical properties of the polymeric membranes. The “V-shape” tendency in the plot of W1 [i.e., half-width of CO2 peak sorbed in the membranes] vs glass-transition temperature (Tg) is observed, and has exactly the same tendency that is widely known from the plot of log D (diffusion coefficient) vs Tg. It is suggested that the membranes having a wider W1 give a faster diffusion coefficient, since W1 is inversely related to the moment of inertia of CO2 in the membranes. Two distinct peaks of CO2 were not observed in the infrared spectra of CO2 sorbed in the glassy polymers. This suggests that the states of CO2 in the Henry mode and Langmuir mode in the glassy polymers are similar in the spectroscopic measurements. © 1994 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090320118
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal history and temperature dependence of viscoelastic properties of polymer glasses: Relation to free volume quantities (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 2295-2305 
    Details
    ISSN: 0887-6266
    Keywords: free volume ; viscoelastic properties ; physical aging ; the Doolittle equation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dependence of physical properties on temperature and thermal history of glassy polycarbonate is examined. The average stress relaxation time increases during isothermal aging and with decreasing cooling rate. The temperature dependence of the stress relaxation time was compared with a free volume function calculated from specific volume data reported by Zoller by means of the Simha-Somcynsky theory and with a fractional free volume measured by ortho-positronium annihilation. We report in addition comparisons between free volume fractions extracted from volume data, and creep measurements for polystyrene, and stress relaxation data for poly(vinyl acetate) given by Kovacs et al., Schwarzl and Zahradnik, and Meyer et al. These investigations suggest that in the glassy state the Doolittle equation is valid only in isothermal aging experiments. It follows that in expressing the polymer mobility not only a temperature-dependent free volume but additional temperature-dependent processes need to be considered. © 1995 John Wiley & Sons, Inc.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090331701
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of ultraviolet light irradiation on gas permeability in polyimide membranes. 1. Irradiation with low pressure mercury lamp on photosensitive and nonphotosensitive membranes (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 35 (1997), S. 2259-2269 
    Details
    ISSN: 0887-6266
    Keywords: polyimide membrane ; ultraviolet light irradiation ; crosslinking ; physical changes ; gas permeability ; sorption property ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Two types of polyimide membranes; one crosslinkable and the other noncrosslinkable using ultraviolet light irradiation (UV irradiation), were prepared and investigated concerning the effect of UV irradiation on their gas permeabilities and selectivities. Permeability and diffusion coefficients for O2, N2, H2, and CO2 were determined using the vacuum pressure and time lag method. Sorption properties for carbon dioxide were carried out to evaluate the changes in the free volume in the membranes due to the irradiation. In both membranes, permeability coefficients for all gases used in this study decreased and permselectivity, particularly for H2 over N2, increased with increasing UV irradiation time without a significant decrease in the flux of H2. The coefficients depended on the membrane thickness, suggesting asymmetrical changes in both membranes due to UV irradiation. It was suggested by an attenuated total reflection (ATR) FTIR method and analysis of the gas sorption properties of the membranes that the physical changes due to UV irradiation at the irradiated side in both membranes significantly affected their gas permeation properties compared with the chemical changes, especially the crosslinking in the crosslinkable type. © 1997 John Wiley & Sons, Inc. J. Polym Sci B: Polym Phys 35: 2259-2269, 1997
    Additional Material: 6 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    A New Cleavage Method for the Sugar - Aglycone Linkage in Saponin (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 1192-1201 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Eine neue Spaltungsmethode für die glycosylische Bindung im SaponinEine neue Spaltungsmethode für die glycosylische Bindung im Saponin wird beschrieben. Behandlung von [28-Hydroxy-23,28-dioxoolean-12-en-3β-yl-O-β-D-galactopyranosyl-(1 → 2)-O-α-L-arabinopyranosyl-(1 → 3)-β-D-glucopyranosid]uronsäure (1) mit Diazomethan/Ether in Methanol ergab das Aglycon 2 und die Zucker 3 und 4. Auf Grund chemischer und spektroskopischer Beweise wurden sie als Methyl-3β,23α-dihydroxy-3-O,23-methylenolean-12-en-28-oat (2), Methyl-[methyl-O-β-D-galactopyranosyl-(1 → 2)-O-α-L-arabinopyranosyl-(1 → 3)-α-D-glucopyranosid]uronat (3) und Methyl-(O-β-D-galactopyranosyl-(1 → 2)-O-α-L-arabinopyranosyl-(1 → 3)-1,4-anhydro-α-D-glucopyranuronat (4) identifiziert. Diese Methode ist nützlich zur Strukturbestimmung einiger Oleanan-Triterpensaponine und zur Herstellung neuer Oligosaccharide. Die Spaltung des Quillajasäure-3-O-glycosids 10 wird ebenso diskutiert.
    Notes: A new cleavage method for the sugar - aglycone linkage in saponin is described. Treatment of [28-hydroxy-23,28-dioxoolean-12-en-3β-yl-O-β-D-galactopoyranosyl-(1 → 2)-O-α-L-arabinopyranosyl-(1 → 3)-β-D-glucopyranosid]uronic acid (1) with diazomethane - ether in methanol gave the aglycone 2 and the sugars 3 and 4. On the basis of chemical and spectral evidence they were determined as methyl 3β,23α-dihydroxy-3-O,23-methylenolean-12-en-28-oate (2), methyl [methyl O-β-D-galactopyranosyl-(1 → 2)-O-α-L-arabinopyranosyl-(1 → 3)-α-D-glucopyranosid]uronate (3), and methyl O-β-D-galactopyranosyl-(1 → 2)-O-α-L-arabinopyranosyl-(1 → 3)-1,4-anhydro-α-D-glucopyranuronate (4). This method is useful for structure determination of some oleanane triterpenoid saponins and for yielding new oligosaccharides. The cleavage of the quillaic acid 3-O-glycoside 10 is also discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850609
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  • 10
    Electronic Resource
    Electronic Resource
    Biologically active glycosides from asteroidea, XIII. Glycosphingolipids from the starfish Acanthaster planci, 2. Isolation and structure of six new cerebrosides (1988)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 19-24 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Biologisch aktive Glycoside aus Asteroidea, XIII. - Glycosphingolipide aus dem Seestern Acanthaster planci, 22). - Isolierung und Struktur von sechs neuen CerebrosidenSechs neue Cerebroside (Ceramid-monohexoside), Acanthacerebrosid A (1), B (2), C (3), D (4), E (5) und F (6), wurden aus der wasserunlöslichen Lipid-Fraktion des Chloroform-Methanol-Extrakts des Seesterns Acanthaster planci isoliert. Auf Grund der chemischen und spektrometrischen Untersuchungen ließen sich die Strukturen als 1-O-(β-D-Glucopyranosyl)-substituiertes (2S,3S,4R)-2-[(2R)-2-Hydroxytetracosanoylamino]-1,3,4-hexadecanetriol (1), (2S,3S,4R)-2-[(2R)-2-Hydroxyhexadecanoylamino]-1,3,4-docosantriol (2), (2S,3S,4R,13E)-2-[(2R)-2-Hydroxyhexadecanoylamino]-13-docosen-1,3,4-triol (3), (2S,3R,4E,10E)-2-[(2R)-2-Hydroxydocosanoylamino]-4,10-octadecadien-1,3-diol (4), (2S,3R,4E,10E)-2-[(2R)-2-Hydroxytricosanoylamino]-4,10-octadecadien-1,3-diol (5) und (2S,3R,4E,10E)-2-[(2R)-2-Hydroxytetracosanoylamino]-4,10-octadecadien-1,3-diol (6) charakterisieren. Die Isolierung der strukturell sehr ähnlichen Cerebroside gelang durch Reversed-Phase-HPLC. Negativ-FABMS-Spektrometrie ließ sich erfolgreich zur Molmassen-Bestimmung der Cerebroside einsetzen.
    Notes: Six new cerebrosides (ceramide monohexosides), acanthacerebroside A (1), B (2), C (3), D (4), E (5), and F (6) were isolated from the water-insoluble lipid fraction of the chloroform-methanol extract of the starfish Acanthaster planci. On the basis of chemical and spectral evidences, they were characterized as 1-O-(β-D-glucopyranosyl)-substituted (1S,3S,4R)-2-[(2R)-2-hydroxytetracosanoylamino]-1,3,4-hexadecanetriol (1), (2S,3S,4R)-2-[(2R)-2-hydroxyhexadecanoylamino]-1,3,4-docosanetriol (2), (2S,3S,4R,13E)-2-[(2R)-2-hydroxyhexadecanoylamino]-13-docosene-1,3,4-triol (3), (2S,3R,4E,10E)-2-[(2R)-2-hydroxydocosanoylamino]-4,10-octadecadiene-1,3-diol (4), (2S,3R,4E,10E)-2-[(2R)-2-hydroxydocosanoylamino]-4,10-octadecadiene-1,3-diol (5), and (2S,3R,4E,10E)-2-[(2R)-2-hydroxytetracosanoylamino]-4,10-octadecadiene-1,3-diol (6). Reversed-phase HPLC was effective to isolate these cerebrosides revealing the very close resemblance in structure. Negative FABMS spectrometry was useful in providing information on the molecular mass of the cerebrosides.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198819880105
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