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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 1635-1639 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polyacetylene-block-polystyrene was synthesized via an anionic-to-metathesis catalysis. The polymers obtained were characterized by UV/visible spectroscopy, IR spectroscopy and gel permeation chromatography.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Copolymers containing acetylene and pentenamer units were synthesized by sequential addition of cyclopentene and then acetylene to an active metathesis catalyst system. The formation of block copolymers was indicated by UV-vis spectroscopy, gel permeation chromatography and infra-red spectroscopy.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 21 (1992), S. 15-24 
    ISSN: 0886-1544
    Keywords: actin edge-bundle ; cortical tension ; cell shape ; microfilaments ; cell adhesion ; cell motility ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: We have previously described actin edge-bundles (AEBs) as cables of microfil-aments lining the webbed edges of 3T3 cells (Zand and Albrecht-Buehler: Cell Motil. Cytoskeleton 13:195-211, 1989). We have suggested that AEBs, along with their cell-substratum adhesions, resist cortical tension and prevent the collapse of cytoplasm towards the nucleus. In this paper, we report several stages of AEB disassembly and re-formation induced by the following micro-manipulations(1)Scoring of the webbed edge of a 3T3 cells with a microneedle. As a result the sides of the score retracted and the severed AEB appeared to disassemble down to its terminal adhesion points. The retraction stopped after 20-40 seconds and the cells formed a webbed edge with large curvature. Over a period of 20-80 minutes, the new web decreased in length and depth, until it regained its approximate original shape.(2)Bending of cell processes at acute angles. As a result the processes moved until they projected at right angles to the side of the cell and formed new webs gradually expanded their area. In both cases, the nascent webs were lined by actin edge-bundles.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 13 (1989), S. 195-211 
    ISSN: 0886-1544
    Keywords: cell shape ; cortical actin ; stress fibers ; microfilament bundles ; cell adhesion ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The outline of cells in sparse cultures consists prediminantly of concave and convex segments; straight segments are rare and ephemeral. The convex segments are areas of active cell expansion. The concave segments are stationary and web-shaped, similar in profile to the cables of a suspension bridge. In 3T3 fibroblasts, we have found a single microfilament bundle following the outline of every webbed edge and have called it the actin edge-bundle (AEB). While the AEB is composed predominantly of actin, α-actinin and myosin are also present. In contrast to normal stress fibers, AEBs are more resistant to several treatments that depolymerize F-actin. Once an AEB disassembles, however, the webbed edge collapses and retracts, suggesting that the actin edge-bundle is a specialized cytoskeletal structure that supports the webbed edges of interphase 3T3 fibroblasts. The stability of AEBs is independent of microtubules. We suggest that the microfilament bundles that frequently line the lateral contacts between epithelial cells in vivo may be related to the actin edge-bundle.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 13 (1989), S. 94-103 
    ISSN: 0886-1544
    Keywords: cell adhesion ; cell motility ; near infrared light ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Interference-reflection microscopy (IRM) is the only method presently available with which to visualize cell-substratum adhesions in living tissue culture cells continuously for long periods of time without the use of fluorescent markers (Curtis: J. Cell Biol. 20:199-215, 1964; Izzard and Lochner: J. Cell Sci. 21:129-159, 1976). This method utilizes approximately 1% of the incident illumination to produce the IRM image (Verschueren: J. Cell Sci. 75:279-301, 1985) and so far has required the use of high-intensity light sources in the visible spectral range (400-800 nm). Unfortunately, visible light of this intensity and spectral range induces marked changes in the behavior and morphology of motile fibroblasts, including cessation of locomotion. In contrast, the present paper reports that continuous observations of live cells in IRM for periods of up to 8 hours are possible if the illuminating light is in the red to near-infrared range (650-950 nm) and without any observable change in normal cell morphology or behavior. In addition, we describe how the technique of Y-contrast image processing can be applied to IRM images to create a three-dimensional image of the ventral cell surface topography.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 2527-2537 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A simple kinetic relationship is proposed to model the rate of removal of bacterial cells from solid surface by a shearing force. The theory is compared to experimentally obtained data for the removal of B. cereus cells from glass capillaries, the shear being imparted by a the flow of medium through the capillary. The critical shear stress required to sterilize the capillary wall is obtained experimentally for a number of industrial contaminant bacteria. The effect of settling time on critical shear stress is also investigated.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 25 (1983), S. 891-900 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In a previous article, the authors proposed a simple model for the rate of removal of bacterial cells from solid surfaces by fluid shear. This Model has been extended to include the deposition of cells from a flowing suspension. The theory is compared to experimentally obtained data for the deposition of Bacillus cereus cells onto the surface of glass capillaries. The effect of a hydrophobic surface, siliconized glass, and the addition of an antifoam agent to the suspension is also investigated.
    Additional Material: 6 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 8 (1966), S. 631-632 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 11 (1969), S. 1247-1254 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Red kidney bean (Phascolus vulgaris) cells, derived from roof, callus, were grown in suspension culture in shake flasks and in laboratory fermentors using batch and continuous batch culture techniques. The medium contained casein hydrolysate, sucrose, inorganic salts, vitamins, and growth hormones. In continuous batch culture yields of up to 171 g wet weight, (8.5 g dry weight) per liter were obtained in 7 days. Organic nitrogen was used preferentially. Growth on nitrate was considerably slower than on organic nitrogen sources. Indole acetic and naphthalene acetic acids were not essential for good growth of the cells whereas kinetin and 2, 4-D were. The optimum pH for growth was about p11 4.5. The presence of amylase and peroxidase was detected in culture filtrates. Amylase activity was low in either the presence or the absence of starch in the medium. Peroxidase production could be related directly with growth of the culture. Maximum peroxidase yield, as measured by the guaiacol method and expressed as horse radish peroxidase, was 1.25 × 10-8 M.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 36 (1990), S. 1625-1632 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A new group contribution lattice-fluid equation of state (GCLF-EOS) is described that can accurately predict the activities of solvents in polymer solutions. This equation of state is a modification of the equation of state derived by Panayioutou and Vera (1982), which is based on the lattice statistics developments of Guggenheim (1952). The group contribution modification permits the prediction of solvent activity, given only the structure of the polymer and solvent involved. The GCLF-EOS can accurately predict solvent activities in polystyrene, polyethylene, poly(ethylene oxide), poly(ethylene glycol), poly(propylene oxide), and poly(vinyl chloride). The model does not perform as well for solvent activities in polyisobutylene due to the inaccurate group contribution values for the quaternary carbon group.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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