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  • Articles: DFG German National Licenses  (82)
  • 2000-2004  (44)
  • 1985-1989  (38)
  • 1
    Electronic Resource
    Electronic Resource
    Role of iron in lithium-niobate crystals for the dark-storage time of holograms (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4282-4286 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dark decay of holograms stored in iron-doped photorefractive lithium-niobate crystals is studied for samples containing up to 0.25 wt% Fe2O3 (iron concentration 71×1018 cm−3). The oxidation/reduction state of the crystals, i.e., the concentration ratio of Fe2+ and Fe3+ ions, is changed in a wide range by thermal annealing. The dark decay is attributed to two effects: An ionic dark conductivity arising from mobile protons and an electronic dark conductivity caused by tunneling of electrons between iron sites. The latter is proportional to the effective trap density, i.e., to the density of charge carriers which can be moved between the iron sites. The proportionality factor is the specific dark conductivity which increases exponentially with the third root of the entire iron concentration. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289814
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  • 2
    Electronic Resource
    Electronic Resource
    Spontaneous vesiculation of aqueous lipid dispersions (1986)
    s.l. : American Chemical Society
    Biochemistry 25 (1986), S. 2126-2134 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00356a042
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  • 3
    Electronic Resource
    Electronic Resource
    Wide-range-tunable laterally coupled distributed feedback lasers based on InGaAsP–InP (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2684-2686 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated tunable distributed feedback (DFB) lasers based on InGaAsP quantum wells grown by molecular-beam epitaxy. Two-section tunable DFB lasers were fabricated by patterning laterally gain coupling binary superimposed gratings perpendicular to the ridge waveguide. Side mode suppression ratios of up to 42 dB have been achieved. The tuning range covers 25 nm. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1404397
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  • 4
    Electronic Resource
    Electronic Resource
    Subunit I is the Catalytic Center of Paracoccus denitrificans Cytochrome c Oxidase (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 550 (1988), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1988.tb35317.x
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of a pre-operative infusion of Ringer's solution on splanchnic perfusion in patients undergoing coronary artery bypass grafting (2002)
    Oxford, UK : Blackwell Science Ltd
    Anaesthesia 57 (2002), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary Surgical patients develop a fluid deficit during pre-operative starvation. This study examines the effects of pre-operative fluid administration on haemodynamic variables, oxygenation and splanchnic perfusion in patients undergoing elective coronary artery bypass grafting. Forty-eight patients were randomised to receive either a pre-operative crystalloid infusion (crystalloid group, n = 24) or no infusion (control group, n = 24). Patients in the crystalloid group received a continuous infusion of Ringer's solution at 1.5 ml.kg−1.h−1 from 22:00 h until induction of anaesthesia the next morning. Immediately before induction of anaesthesia, all patients were given a colloid infusion to increase pulmonary capillary wedge pressure and central venous pressure to similar levels inboth groups. Haemodynamic and oxygenation parameters were measured using invasive cardiovascular monitoring, and splanchnic perfusion was assessed by indocyanine green clearance. Patients in the crystalloid group received a mean (SD) of 1008 (140) ml of Ringer's solution overnight. Patients in the crystalloid group had a higher splanchnic blood flow than the control group before induction of anaesthesia [mean (SD) = 1782 (573) ml.min−1 vs. 1391 (333) ml.min−1, p 〈 0.05]. There were no significant differences in systemic haemodynamic data and global oxygenation parameters between the two groups. Pre-operative infusion of crystalloid appears to result in an improvement in pre-operative splanchnic perfusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2044.2002.02696.x
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of desflurane and isoflurane on intestinal tissue oxygen pressure during colorectal surgery (2002)
    Oxford, UK : Blackwell Science, Ltd
    Anaesthesia 57 (2002), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary Volatile anaesthetics differ in the effects they have on splanchnic haemodynamics and oxygenation. The aim of this study was to evaluate the effects of desflurane and isoflurane as part of a balanced anaesthetic technique on intestinal tissue oxygenation during colorectal surgery. Data were analysed from 44 patients randomly assigned to receive either desflurane (desflurane group, n= 20), or isoflurane (isoflurane group, n= 24) for inhalational anaesthesia. Tissue oxygen pressure (Ptisso2)␣was measured on the serosal side of the large intestine prior to colonic resection (T1) and␣following the completion of the bowel anastomosis (T2). In addition, haemodynamic and oxygenation parameters were assessed. No difference in mean Ptisso2 was observed between the groups at T1 [desflurane group: 8.1 (2.9) kPa vs. isoflurane group: 7.7 (2.7) kPa]. Following completion of the anastomosis (T2) mean Ptisso2 was higher in the isoflurane group [9.6 (2.9) kPa] than the desflurane group [7.7 (2.4) kPa, p = 0.025]. During surgery no difference between the␣groups could be observed with regard to haemodynamics and global oxygenation parameters. The lack of a difference between the groups in Ptisso2 before resection of the colon suggests that,␣under normal conditions, desflurane and isoflurane have comparable effects on intestinal blood␣flow and oxygenation. However, following local ischaemia, the reactive hyperaemia seems␣to␣be better preserved during isoflurane anaesthesia indicated by a local increase in Ptisso2␣(p = 0.013) following completion of the bowel anastomosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0003-2409.2001.02363.x
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  • 7
    Electronic Resource
    Electronic Resource
    Enhanced sampling in simulations of dense systems: The phase behavior of collapsed polymer globules (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 630-635 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Slow relaxation due to dense packing encumbers the simulation of a variety of many particle systems like, for instance, collapsed polymers (folded proteins) or structural glasses. We propose to overcome this problem by a new algorithm, assigning each particle a fourth space coordinate and treating an expanded ensemble of systems of which the one with all fourth coordinates equal to zero is the physical system. An application of this simulation strategy to the coil–globule transition of homopolymers using the bond-fluctuation model reveals a hitherto unfound first-order liquid to solid transition of the collapsed globule. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1379763
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  • 8
    Electronic Resource
    Electronic Resource
    New mechanism of membrane fusion (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 2342-2345 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have carried out Monte Carlo simulation of the fusion of bilayers of single chain amphiphiles which show phase behavior similar to that of biological lipids. The fusion mechanism we observe is very different from the "stalk" hypothesis. Stalks do form on the first stage of fusion, but they do not grow radially to form a single bilayer diaphragm. Instead, stalk formation destabilizes the membranes and results in hole formation in the vicinity of the stalks. When holes in each bilayer nucleate spontaneously next to the same stalk, an incomplete fusion pore is formed. The fusion process is completed by propagation of the initial connection, the stalk, along the edges of the aligned holes. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1448496
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  • 9
    Electronic Resource
    Electronic Resource
    Nano-dewetting: Interplay between van der Waals- and short-ranged interactions (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 9960-9969 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The wetting behavior of a polymer liquid on a coated substrate is investigated via numerical self-consistent field calculations and experiments. The polymer does not wet the coated substrate, but the substrate might stabilize a mesoscopic film. Experiments observe a stable mesoscopic film of nanometer thickness in coexistence with macroscopic drops at high temperatures. Upon cooling, this mesoscopic polymer film breaks up into droplets (nano-dewetting). Our self-consistent field calculations suggest that the stability of the mesoscopic film is determined by a subtle interplay between van der Waals forces and short-ranged forces due to the distortion of the profile in the vicinity of the substrate. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1413985
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  • 10
    Electronic Resource
    Electronic Resource
    A novel geometric embedding algorithm for efficiently generating dense polymer structures (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 9764-9771 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new algorithm for generating starting polymer structures for molecular simulations (e.g., MD) in dense phase is presented. The algorithm yields structures that fulfill to a large extent rotational isomeric state (RIS) probabilities and avoid atomic overlap. The heuristic search bases on the new parallel-rotation (ParRot) technique. We tested the performance of the algorithm on two polymeric systems: Atomistic polyethylene and polystyrene. The algorithm permits to tackle the problem of packing chains into large boxes of size up to 50 Å in a couple of hours on common workstations. Moreover, our packing algorithm is applicable for general polymer systems. The algorithm requires CPU effort scaling with a power 2.8 in the chain length, and with a power 1.5 in the number of chains. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1371480
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