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  • Wiley-Blackwell  (13)
  • 1985-1989  (7)
  • 1975-1979  (3)
  • 1940-1944  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Das Verhalten von Molybdänlösungen gegen Reduktionsmittel (1941)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 246 (1941), S. 243-257 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Der zeitliche Verlauf der Reduktion von Molybdänlösungen mit Zn und Cd wird bei Gegenwart verschiedener Säuren untersucht. Aus Potentialmessungen geht hervor, daß die Reduktion zunächst zur Bildung von Mo(V) und dann bis Zum Mo(III). führt. Mo(IV) tritt nicht auf.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19412460302
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of trimellitic anhydride in workplace air using reverse phase high performance liquid chromatography (1986)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 9 (1986), S. 308-309 
    Details
    ISSN: 0935-6304
    Keywords: High performance liquid chromatography, HPLC ; Reverse phase ; Internal standard ; Trimellitic anhydride ; Air sample ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240090516
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  • 3
    Electronic Resource
    Electronic Resource
    Cellular dynamics of conjugation in the ciliate euplotes aediculatus. II. Cellular membranes (1987)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 192 (1987), S. 43-61 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The formation and subsequent dissolution of a common bridge of cytoplasm between conjugating ciliated protozoan cells provides an excellent opportunity to follow the dynamics of the cellular membrane systems involved in this process. In particular, separation of conjugant partners offers the chance to observe, at a fixed site on the cell surface, how the ciliate surface complex of plasma and alveolar membranes (collectively termed the “pellicle”) is constructed. Consequently, cortical and cellular membranes of Euplotes aediculatus were studied by light and electron microscopy through the conjugation sequence. A conjugant fusion zone of shared cytoplasm elaborates between the partner cells within their respective oral fields (peristomes) to include microtubules, cytosol, and a concentrated endoplasmic reticulum (heavily stained by osmium impregnation techniques) that may also be continuous with cortical ER of each cell. Cortical membranes displacd by fusion are autolyzed in acid phosphatase-positive lysosomes in the fusion zone. As conjugants separate, expansion of the plasma membrane may occur through the fusion of vesicles with the plasma membrane, presumably at bare membrane, presumably at bare membrane patches near the fusion zone. The underlying cortical alveolar membranes and their plate-like contents are reconstructed beneath the plasma membrane, apparently by multiple fusions of dense-cored alveolar precursor vesicles (APVs). These precursor vesicles themselves appear to condense directly from the smooth ER present in the fusion zone. No Golgi apparatus was visible in the fusion zone cytoplasm, and no step of APV maturation that might involve the Golgi complex was noted.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051920105
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  • 4
    Electronic Resource
    Electronic Resource
    Cellular dynamics of conjugation in the ciliate euplotes aediculatus. I. Cytoskeletal elements (1987)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 192 (1987), S. 27-42 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The fate and possible roles of the cytoskeleton in the process of conjugation in the hyptrich ciliate Euplotes aediculatus were investigated. Following the coalescence of the plasma membranes of the conjugant cells, a fusion zone or bridge of cytoplasm contributed by both partners is constructed. The sub-alveolar microtubule layers of the vegetative cell cortex remain in place to define the fusion zone boundaries after cell union. The initial fusion zone consists primarily of featureless ground cytoplasm; soon the ground plasm becomes crowded with microtubules and anastomosing smooth endoplasmic reticulum, which become displaced only late in conjugation as the migratory pronuclei are exchanged between partners. Fusion zone microtubules, functioning in some undetermined way, may be involved in the nuclear migration. Resorption of the posterior portion of each partner's buccal apparatus results in the degradation of the component cilia within acid phosphatase-positive autophagic bodies. Silver staining for light microscopy shows that the late fusion zone contracts forward from the posterior border, then constricts to separate the conjugants. In some separating pairs remnants of a microfilamentous assembly are seen at the posterior edge of the fusion zone; the full extent of this system may be masked by partial degradation due to osmium tetroxide fixation. Treatment of conjugants for 6 hours with cytochalasin B prevents separation, possibly through inhibition of the actin-like microfilament assembly in the fusion zone. The observations and experiments favor a model of cell separation following conjugation in which the fusion zone is resorbed by motile or contractile processes occurring within or around the fusion bridge itself.
    Additional Material: 21 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051920104
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  • 5
    Electronic Resource
    Electronic Resource
    An automatic apparatus for continuous suspension culture with a concentrating device (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 18 (1976), S. 1497-1506 
    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 chemostat in which mammalian cells can be raised in continuous suspension culture is described. It is constructed from commercially available parts. This apparatus has the advantage over earlier models in that the medium can be pumped off free of cells, thus suddenly increasing the cell concentration in the culture. The apparatus has been successfully used in studies on contact inhibition.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260181102
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  • 6
    Electronic Resource
    Electronic Resource
    Die elektrolytische und polarographische Reduktion von Molybdänlösungen (1941)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 246 (1941), S. 258-274 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Der Verlauf der elektrolytischen Reduktion von schwefel- und salzsauren Molybdänlösungen wird untersucht. Die Reduktion verläuft über die 5-wertige Stufe bis zum Mo(III). In sehr schwach sauren Lösungen führt sie unmittelbar zu festem Mo(OH)3.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19412460303
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  • 7
    Electronic Resource
    Electronic Resource
    Platelet-derived growth factor stimulates rapid polyphosphoinositide breakdown in fetal human fibroblasts (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 124 (1985), S. 391-396 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The addition of human platelet-derived growth factor (PDGF) to confluent, quiescent cultures of human diploid fibroblasts induced the rapid breakdown of cellular polyphosphoinositides. The levels of 32P-labeled phosphatidylinositol 4,5-bisphosphate (PIP2), phosphatidylinositol 4-phosphate (PIP), and phosphatidylinositol (PI) decreased by 30 to 40% within 1 min after exposure of the cells to PDGF. The levels of PIP and PIP2 returned to their initial values within 3 and 10 min, respectively, after PDGF addition. The level of PI continued to increase after it had returned to control values and was up threefold within 30 min after PDGF addition. In cells prelabeled with myo-[3H]inositol PDGF caused an eightfold increase in the levels of inositol trisphosphate (IP3) within 2 min. Lesser increases, twofold and 1.3-fold, respectively, were seen in levels of inositol bisphosphate (IP2) and inositol monophosphate (IP). Within 10 min after PDGF addition the levels of all three inositol phosphates had decreased to control values. The levels of IP3 measured 2 min after PDGF addition depended on the PDGF concentration and were maximal at 5-10 ng/ml of PDGF. Similar concentrations of PDGF stimulate maximal cell growth and DNA synthesis in these cells.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041240306
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Herstellung und Eignung mikrosphärischer Silicagele für die Säulenchromatographie (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 451 (1979), S. 82-92 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Preparation and Suitability of Microspherical Silicas for the Column ChromatographyMicrospherical silicas with particle sizes up to 1 m̈m having nonspherical portions of ≤ 1 percent have been prepared using polyethoxysiloxane (polyester). An acid treatment of the hydrogels resulted in larger specific surfaces of the final products.The synthetized silica gels are excellently suitable for chromatographic purposes in dependence on their specific surface and their average pore diameter, resp.For the rapid determination of types of compounds by means of the micro fluorescent indicator adsorption analysis (MFIA) already crude gels could be used without any fractionation. Their specific surfaces had to be within the range of 500 ± 200 m2 g-1. For the use in the high performance liquid chromatography (HPLC) efficient supports should have specific surfaces in the range of 500 ± 300 m2 g-1. In this case the lower limiting value is determined by the capacity factors of the separation problem.Spheroids with surfaces of 200 ± 150 m2 g-1 have been obtained following the gel synthesis by hydrothermal treatment. These gels, however, were characterized by greater heights for theoretical plates in comparison with the initial gel.With gels, having surfaces in the range of 200 and 840 m2 g-1, the chromatographic investigation resulted in selectivity factors being independent of the surface. The capacity factors were strictly proportional to the specific surface of the support.
    Notes: Es wurde mikrosphärisches Silicagel mit Korngrößen bis zu 1 m̈m bei nichtsphärischen Anteilen ≤ 1% unter Verwendung von Polyäthoxysiloxan (Polyester) hergestellt. Saure Behandlung der Hydrogele führte zu höheren spezifischen Oberflächen der Endprodukte.Die synthetisierten Silicagele eigneten sich in Abhängigkeit von ihrer spezifischen Oberfläche bzw. ihrem mittleren Porendurchmesser ausgezeichnet zur Chromatographie.Für die schnelle Stoffgruppenbestimmung mittels Mikro-Fluoreszenzindikator-Adsorptionsanalyse (MFIA) konnten bereits Rohgele ohne Fraktionsierung Verwendung finden. Ihre spezifischen Oberflächen mußten innerhalb 500 ± 200 m2 g-1 liegen. Zum Einsatz in der schnellen Flüssigchromatographie (HPLC) sollten leistungsfähige Träger spezifische Oberflächen im Bereich 500 ± 300 m2 g-1 aufweisen. Hier richtet sich der untere Grenzwert nach den Kapazitätsfaktoren des Trennproblems.Sphäroide mit Oberflächen von 200 ± 150 m2 g-1 wurden im Anschluß an die Gelsynthese durch hydrothermales Altern gewonnen. Diese Gele zeigten jedoch im Vergleich zum Ausgangsgel größere theroretische Trennstufenhöhen.Die chromatographische Untersuchung ergab an Gelen mit Oberflächen zwischen 200 und 840 m2 g-1 oberflächenunabhängige Selektivitätsfaktoren. Die Kapazitätsfaktoren waren der spezifischen Trägeroberfläche streng proportional.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794510113
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  • 9
    Electronic Resource
    Electronic Resource
    Über Oberflächenverbindungen von Übergangsmetallen. XIV. Koordinative ungesättigte Oberflächenverbindungen von Vanadium(III) auf SilicagelProfessor Walter Hieber zum 80. Geburtstage in Dankbarkeit gewidmet (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 426 (1976), S. 141-149 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Surface Compounds of Transition Metals. XIV. Coordinatively Unsaturated Surface Compounds of Vanadium(III) on SilicagelVanadium(V) reacts with silicagel (aqueous impregnation, activation in O2 at 800°C) to a colourless highly dispersed surface compound, which can be reduced by CO to coordinatively unsaturated violet surface vanadium(III). Reoxydation with O2 forms a deep-blue surface peroxide under chemiluminescence; heat treatment at 300°C reconstitutes the original vanadium(V) surface compound with simultaneous loss of 1/2 O2.
    Notes: Vanadium(V) bildet bei wäßriger Dotierung und nachfolgender Aktivierung (O2, 800°C) auf Silicagel farblose, hochdisperse Oberflächenverbindungen, die sich mit CO zu koordinativ ungesättigtem, violettem Oberflächen-Vanadium(III) reduzieren lassen. Reoxydation mit O2 führt unter Chemilumineszenz zunächst zu einem tiefblauen Oberflächen-Peroxid , das beim Erwärmen auf 300°C unter Abgabe von 1/2 O2 vollständig in das ursprüngliche Vanadium(V) übergeht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764260202
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  • 10
    Electronic Resource
    Electronic Resource
    Kinetische Racematspaltungen ausgehend von rac-Alkoholen oder rac-Carbonsäurehalogeniden unter Mitwirkung optisch aktiver Induktorbasen (1989)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 533-538 
    Details
    ISSN: 0170-2041
    Keywords: Resolution, kinetic ; Chiral tertiary amines ; Chiral esters ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kinetic Resolutions Starting with rac-Alcohols or rac-Acyl Halides Using Optically Active Inductor BasesIn the reaction of one mole equivalent of achiral acyl halides with two equivalents of rac-alcohols in the presence of one equivalent of an optically active inductor base (tertiary amine) partially optically active esters and partially optically active alcohols are formed, having in some cases high optical purity (60 - 70%). The alcohol moiety of the ester and the unchanged alcohol are of opposite configuration. Treatment of two equivalents of rac-acylhalides with one equivalent of an achiral alcohol and an inductor base also leads to a high degree of optical induction. The carbonic acid moiety in the ester and the unchanged acid are of opposite configuration. The optical induction is influenced a) by the ligands linked to the reaction centers, b) by the relative quantities of the reacting partners, c) by the solvent, and d) by the temperature.
    Notes: Bei der Umsetzung eines Moläquivalents achiraler Carbonsäurehalogenide mit zwei Moläquivalenten rac-Alkoholen entstehen unter Mitwirkung von einem Moläquivalent einer optisch aktiven Induktorbase (tertiäres Amin) partiell optisch aktive Ester sowie partiell optisch aktive Alkohole in zum Teil hoher optischer Reinheit (60 - 70%). Der im Ester gebundene Anteil an Alkohol sowie der nicht umgesetzte Alkohol haben entgegengesetzte Konfiguration. Der Induktionsgrad ist ähnlich hoch, wenn man zwei Moläquivalente eines rac-Carbonsäurehalogenids mit je einem Moläquivalent eines achiralen Alkohols und einer Induktorbase umsetzt. Der Carbonsäureanteil im Ester und die freie Säure haben entgegengesetzte Konfiguration. Die optischen Induktionen werden beeinflußt a) durch die Art der mit den Reaktionszentren verknüpften Liganden, b) durch die relativen Mengen der Reaktionspartner, c) durch das Lösungsmittel und d) durch die Temperatur.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198919890194
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