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  • 1
    Electronic Resource
    Electronic Resource
    pH and Temperature Effect on the Absorption Spectra of Pseudomonas aeruginosa Cytochrome c-551 Solution (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 4726-4728 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100068a039
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  • 2
    Electronic Resource
    Electronic Resource
    Polymer light-emitting electrochemical cells with frozen junctions (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 4594-4599 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on polymer light-emitting electrochemical cells (LECs) with frozen p-i-n junctions. The dynamic p-i-n junction in polymer LECs is stabilized by lowering the temperature below the glass transition temperature of the ion-transport polymer. Detailed studies have shown that the frozen p-i-n junction in LECs based on the luminescent polymer poly[5-(2′ethylhexyloxy)-2-methoxy-1,4-phenylene vinylene] and polyethylene oxide containing lithium triflate (PEO:LiCF3SO3) is stable at temperatures up to 200 K. Frozen-junction LECs offer a number of advantages; they exhibit unipolar light emission, balanced injection, fast response, high brightness, low operating voltage, and insensitivity to electrode materials and film thickness. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371408
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  • 3
    Electronic Resource
    Electronic Resource
    The segregation of the Escherichia coli origin and terminus of replication (2002)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 46 (2002), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Escherichia coli chromosome replication forks are tethered to the cell centre. Two opposing models describe how the chromosomes segregate. In the extrusion-capture model, newly replicated DNA is fed bi-directionally from the forks toward the cell poles, forming new chromosomes in each cell half. Starting with the origins, chromosomal regions segregate away from their sisters progressively as they are replicated. The termini segregate last. In the sister chromosome cohesion model, replication produces sister chromosomes that are paired along much of their length. The origins and most other chromosomal regions remain paired until late in the replication cycle, and all segregate together. We use a combination of microscopy and flow cytometry to determine the relationship of origin and terminus segregation to the cell cycle. Origin segregation frequently follows closely after initiation, in strong support of the extrusion-capture model. The spatial disposition of the origin and terminus sequences also fits this model. Terminus segregation occurs extremely late in the cell cycle as the daughter cells separate. As the septum begins to invaginate, the termini of the completed sister chromosomes are transiently held apart at the cell centre, on opposite sides of the cell. This may facilitate the resolution of topological linkages between the chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2002.03234.x
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  • 4
    Electronic Resource
    Electronic Resource
    The P1 plasmid is segregated to daughter cells by a ‘capture and ejection’ mechanism coordinated with Escherichia coli cell division (2002)
    Oxford, UK : Blackwell Science, Ltd
    Molecular microbiology 46 (2002), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The fate of the P1 plasmid of Escherichia coli was followed by time-lapse photomicroscopy. A GFP–ParB fusion marked the plasmid during partition (segregation) to daughter cells at slow growth rate. The process differs from that previously inferred from statistical analysis of fixed cells. A focus of plasmid copies is captured at the cell centre. Immediately before cell division, the copies eject bidirectionally along the long axis of the cell. Cell division traps one or more plasmid copies in each daughter. They are not directed to a prescribed position but are free to move, associate and disassociate. Later, they are captured to the new cell centre to restart the cycle. A null P1 par mutant associates to form a focus, but it is neither captured nor ejected. A dominant negative ParB protein forms a plasmid focus that attaches to the cell centre but never ejects. It remains captive at the centre and blocks host cell division. The cells elongate. Eventually the intact focus is pushed to one side and the cells divide simultaneously in several places at the same time. This suggests that the wild-type plasmid imposes a regulatory node on the host cell cycle, preventing cell division until its own segregation is completed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2002.03156.x
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  • 5
    Electronic Resource
    Electronic Resource
    The role of Par proteins in the active segregation of the P1 plasmid (2004)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 53 (2004), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The parS centromere-like site promotes active P1 plasmid segregation in the presence of P1 ParA and ParB proteins. At the modest growth rate used here, time-lapse and still photomicroscopy shows that the plasmid copies are clustered as a focus at the Escherichia coli cell centre. Just before cell division, the focus is actively divided and ejects bidirectionally into opposite halves of the dividing cell. In the absence of the wild-type parS binding protein ParB, a focus was formed, but generally did not go to the cell centre. The randomly placed focus did not divide and was inherited by one daughter cell only. In the absence of ParA, foci formed and frequently fixed to the cell centre. However, they failed to divide or eject and were left at the new cell pole of one cell at division. Thus, ParB appears to be required for recognition of the plasmid and its attachment to the cell centre, and ParA is required for focus division and energetic ejection from the cell centre. The ATPase active site mutation, parAK122E, blocked ejection. Mutant parAM314I ejected weakly, and the daughter foci took two generations to reach a new cell centre. This explains the novel alternation of segregation and missegregation in successive generations seen in time-lapse images of this mutant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.2004.04111.x
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  • 6
    Electronic Resource
    Electronic Resource
    Segregation of the Escherichia coli chromosome terminus (2003)
    Oxford, UK : Blackwell Publishing Ltd.
    Molecular microbiology 50 (2003), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We studied the segregation of the replication terminus of the Escherichia coli chromosome by time-lapse and still photomicroscopy. The replicated termini lie together at the cell centre. They rapidly segregate away from each other immediately before cell division. At fast growth rate, the copies move progressively and quickly toward the centres of the new-born cells. At slow growth rate, the termini usually remain near the inner cell pole and migrate to the cell centre in the middle of the cell cycle. A terminus domain of about 160kb, roughly centred on the dif recombination site, segregated as a unit at cell division. Sequences outside this domain segregated before division, giving two separate foci in predivision cells. Resolution of chromosome dimers via the terminus dif site requires the XerC recombinase and an activity of the FtsK protein that is thought to align the dif sequences at the cell centre. We found that anchoring of the termini at the cell centre and proper segregation at cell division occurred normally in the absence of recombination via the XerC recombinase. Anchoring and proper segregation were, however, frequently disrupted when the C-terminal domain of FtsK was truncated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2003.03746.x
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  • 7
    Electronic Resource
    Electronic Resource
    Anion dominated electrochemical process of poly(N-methylpyrrole) (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 61 (1996), S. 1487-1491 
    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 electrochemical behavior of poly(N-methylpyrrole) (PNMP) has been studied in aqueous solution by cyclic voltammetry and electrochemical quartz crystal microbalance (EQCM). The electrochemical process of PNMP (TsO-) in TsONa solution or PNMP(NO3-) in NaNO3 solution showed good chemical reversibility. The process only involved the anion doping and dedoping. PNMP(TsO-) kept good electrochemical activity in NaNO3 or Na2SO4 solution. But PNMP(NO3-) became less active electrochemically in Na2SO4 solution and inactive in TsONa solution. PNMP(NO3-) in NaCl solution showed similar electrochemical behavior to that in NiCl2 solution. © 1996 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of the doped counteranions on the penetration of H+ cations through poly(N-methylpyrrole) (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 59 (1996), S. 1827-1832 
    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 reduction of H+ cations on the Pt electrode coated with poly(N-methylpyrrole) (PNMP) film was studied in an acidic aqueous solution. The reduction depends strongly on the counteranions originally doped in PNMP during polymerization. H+ cations can penetrate the neutral or overoxidized film from PNMP(TsO-), in which the H+ diffusion coefficient is estimated as 10-5 cm2 s-1 by the potential step chronoamperometry method. But the neutral or overoxidized film from PNMP(NO3-) is closed for H+ penetration. © 1996 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 9
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    Efficient polymer light-emitting diodes using conjugated polymer blends (2002)
    American Institute of Physics
    Details
    Publication Date: 2002-03-18
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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  • 10
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    A Novel n-Type Conjugated Polymer DOCN-PPV:  Synthesis, Optical, and Electrochemical Properties (2006)
    American Chemical Society
    Details
    Publication Date: 2006-12-01
    Print ISSN: 0024-9297
    Electronic ISSN: 1520-5835
    Topics: Chemistry and Pharmacology , Physics
    Published by American Chemical Society
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