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  • 1990-1994  (1)
  • 1985-1989  (2)
  • Chemistry  (3)
  • 1
    Digitale Medien
    Digitale Medien
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 42 (1993), S. 1287-1292 
    ISSN: 0006-3592
    Schlagwort(e): integrated optics ; grating coupler ; FIA ; on-line monitoring ; animal cell culture ; monoclonal antibody ; immunochemical sensor ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A grating coupler was used for the on-line determination of monoclonal antibodies produced in perfused animal cell bioreactor. The device was connected with the culture vessel via a flow-injection analysis (FIA) system, which was controlled automatically. Specific antimouse lgG antibodies were immobilized on the surface of the sensor-chip. After injection of the sample, the binding of mouse lgG was observed in real time. The regeneration of the binding sites of the immobilized antibodies using an acidic solution allowed the on-line detection of produced monoclonal antibodies in the range of 10 to 150 μg/mL. In contrast to other techniques coupled to bioprocesses, the developed method represents a regenerable direct immunosensor. Results were compared with standard ELISA techniques (off-line) and a competitive immunochemical assay using the grating coupler (off-line). © 1993 John Wiley & Sons, Inc.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 0952-3499
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: By employing the principles of “activated swelling”, monosized, superparamagnetic polymer particles have been prepared ranging in size from 1-100 μm. Both during and after the swelling process, the particles can be modified to meet a series of specific demands making them potentially very interesting for many separation and assay purposes.Using monoclonal antibodies to direct the magnetic beads to their targets, immunomagnetic separation has turned out to be one of the most specific, reliable and, above all, the fastest technique available today to isolate particulate material for further studies. So far, most efforts have been concentrated on methodology for fractionation of cells in suspension, such as removal of tumour cells from bone marrow or isolation of lymphoid cells from peripheral blood. These studies have both established the parameters necessary for optimal performance and at the same time laid the groundwork for future developments making immunomagnetic separation an exciting new tool in many research areas.High speed and specificity are the most conspicuous features of immunomagnetic cell separation. These properties have been exploited in the successful development of a new technique for tissue typing of cells directly from peripheral blood specimens. Both higher sensitivity and specificity have been obtained. The same principles can be used for fast and safe quantification of cell populations and subpopulations in blood and cell suspensions.The functions of, and interactions between, peripheral blood cell populations or subpopulations in the immune response have also been studied with high precision. The significance of direct cell contact on the one hand, and soluble factors on the other, can now be established in detail. Immunomagnetic beads have also been used to study the interaction between various T lymphocyte membrane molecules in the early phases of the activation process.Finally, the usefulness of specially developed particles for the fractionation of subcellular components is described.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Synthesis and Structure of Pentaazadienido Complexes of Copper(I) and Copper(II). Crystal Structures of [Cu(F—C6H4N5C6H4—F) (py)]2, [Cu(Cl—C6H4N5C6H4—Cl) (py)]2, [Cu(CH3O—C6H4N5C6H4—OCH3) (py)]2Cu(NH3)42+ reacts in conc. aqueous NH3 with RN2NHN2R to yield insoluble, brownish CuII pentaazadienido complexes Cu(RN5R)2 (R = p-F—C6H4, p-Cl—C6H4, p-MeO—C6H4). The dry compounds are explosiv. They decompose in hot THF or toluene under reduction of CuII to form the CuI complexes Cu(RN5R) from which upon addition of pyridine the dinuclear, red complexes [Cu(RN5R) (py)]2 (R = p-F—C6H4 (1), p-Cl—C6H4 (2) and p-MeO—C6H4 (3)) are obtained.1 crystallizes in two monoclinic modifications: I: P21/c; a = 1370.7(3), b = 1145,2(1), c = 2436.9(3) pm, β = 91.68(1)º, Z = 4, V = 3823.8 · 106 pm3, II: P21/n; a = 1448.2(3), b = 1102.2(1), c = 2276,8(3) pm, β = 102.55(1)º, Z = 4, V = 3547.5 · 106 pm3. 2 forms monoclinic crystals with the space group P21/c; a = 1095.6(6), b = 1820,2(6), c = 1007.5(3) pm, β = 114.12(3), Z = 2; 3 crystallizes monoclinic: P21/c; a = 1213.5(5), b = 1813.8(5), c = 990.0(3) pm, β = 116.76(2)º, Z = 2.The pentaazadienid ion functions in all complexes as bridging ligand with (N1)-η1, (N3)-η1 coordination, resulting in short Cu—Cu distances of 255.2 to 258.0 pm. The pyridine molecules are bound to the Cu atoms being in 1 in a cis and in 2 and 3 in trans arrangement with respect to the Cu—Cu axis.
    Notizen: Cu(NH3)42+ reagiert in konz. wässerigem NH3 mit RN2NHN2R unter Bildung schwerlöslicher CuII-pentaazadienido-Komplexe Cu(RN5R)2 (R = p-F—C6H4, p-Cl—C6H4, p-MeO—C6H4). Die im trockenen Zustand explosiven Verbindungen zersetzen sich beim Erhitzen in THF oder Toluol unter Reduktion des Kupfers zu den CuI-Komplexen Cu(RN5R), aus denen mit Pyridin die zweikernigen, roten Komplexe [Cu(RN5R) (py)]2 (R = p-F—C6H4 (1), p-Cl—C6H4 (2) und p-MeO—C6H4 (3)) entstehen. 1 kristallisiert in zwei monoklinen Modifikationen. I: P21/c; a = 1370,7(3), b = 1145,2(1), c = 2436,9(3) pm, β = 91,68(1)º, Z = 4, V = 3823,8 · 106 pm3, II: P21/n; a = 1448,2(3), b = 1102,2(1), c = 2276,8(3) pm, β = 102,55(1)º, Z = 4, V = 3547,5 · 106 pm3. 2 bildet monokline Kristalle mit der Raumgruppe P21/c; a = 1095,6(6), b = 1820,2(6), c = 1007,5(3) pm, β = 114,12(3)º, Z = 2; 3 kristallisiert ebenfalls monoklin: P21/c; a = 1213,5(5), b = 1813,8(5), c = 990,0(3) pm, β = 116,76(2)º, Z = 2.Das Pentaazadienidion fungiert in allen Komplexen als Brückenligand mit (N1)-η1, (N3)-η1-Koordination, so daß kurze Cu—Cu-Abstände im Bereich von 255,2 bis 258,0 pm resultieren. Die Pyridinmoleküle sind an die Cu-Atome gebunden und in 1 bezüglich der Cu—Cu-Achse in cis- und in 2 und 3 in trans-Stellung angeordnet.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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