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  • 1
    Electronic Resource
    Electronic Resource
    Multilevel cooperative amplified spontaneous emission from the I2(B→X) system (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 5-10 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Amplified spontaneous emission (ASE) on the I2(B→X) system has been studied as a function of excitation wavelength by using a narrow-band pulsed dye-laser pump source. ASE output in the range 1.1–1.3 μm has been observed for dye-laser excitation wavelengths between 515 and 600 nm. Cooperative emission from several adjacent rotational levels has been observed and provides an explanation for anomalous spectral features. The conversion efficiency of dye-laser photons to ASE output was as high as a few percent. Pump energy thresholds as low as 5.0 μJ were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339161
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  • 2
    Electronic Resource
    Electronic Resource
    Thermocapillary Instabilities (1987)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 19 (1987), S. 403-435 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fl.19.010187.002155
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  • 3
    Electronic Resource
    Electronic Resource
    Instabilities of a liquid film flowing down a slightly inclined plane (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 983-989 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Falling films on inclined planes display surface and shear instability modes, the latter being important at small angles β of inclination of the plane. These modes are analyzed with particular attention paid to the effects of surface tension. The results show that the critical Reynolds number of the shear mode is nonmonotonic in either the angle β or the surface-tension parameter ζ but displays a local minimum at nonzero values of β and ζ. For large Reynolds number, an analysis shows that the shear mode is inviscidly stable, but that the surface mode is unstable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866285
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  • 4
    Electronic Resource
    Electronic Resource
    Xylem dysfunction caused by water stress and freezing in two species of co-occurring chaparral shrubs (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 20 (1997), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Water transport from the roots to leaves in chaparral shrubs of California occurs through xylem vessels and tracheids. The formation of gas bubbles in xylem can block water transport (gas embolism), leading to shoot dieback. Two environmental factors that cause gas embolism formation in xylem conduits are drought and freezing air temperatures. We compared the differential vulnerabilities of Rhus laurina and Ceanothus megacarpus, co-dominant shrub species in the coastal regions of the Santa Monica Mountains of southern California, to both water stress-induced and freezing-induced embolism of their xylem. Rhus laurina has relatively large xylem vessel diameters, a deep root system, and a large basal burl from which it vigorously resprouts after wildfire or freezing injury. In contrast, Ceanothus megacarpus has small-diameter vessels, a shallow root system, no basal burl and is a non-sprouter after shoot removal by wildfire. We found that R. laurina became 50% embolized at a water stress of –3 MPa and 100% embolized by a freeze–thaw cycle at all hydration levels. In contrast, C. megacarpus became 50% embolized at a water stress of –9 MPa and 100% embolized by freeze–thaw events only at water potentials lower than –3 MPa. Reducing thaw rates from 0·8 °C min−1 to 0·08 °C min−1 (the normal thaw rate measured in situ) had no effect on embolism formation in R. laurina but significantly reduced embolism occurrence in well-hydrated C. megacarpus (embolism reduced from 74 to 35%). These results were consistent with the theory of gas bubble formation and dissolution in xylem sap. They also agree with field observations of differential shoot dieback in these two species after a natural freeze–thaw event in the Santa Monica Mountains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.1997.d01-94.x
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of soil moisture on the nodulation of post fire seedlings of Ceanothus spp. growing in the Santa Monica Mountains of Southern California (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 99 (1997), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: During the dry season (early May through September of 1994), following a fall 1993 wildfire, a survey of seedling nodulation was conducted at several sites in the Santa Monica Mountains of Southern California. Seedlings of Ceanothus spinosus, C. megacarpus, C. oliganthus, and C. cuneatus were manually excavated. During this period, only 12 of the 182 seedlings excavated were nodulated, and all of the nodulated seedlings were found in the relatively moist clay soils of a stream bank. No nodules were observed on the 170 seedlings excavated from the drier sites. An irrigation experiment was established in midsummer to assess whether water stress inhibits nodulation of post-fire Ceanothus seedlings. Four plots with numerous seedlings of C. cuneatus and C. spinosus were irrigated with distilled water and monitored over a 9-week period. There was a significant increase in nodulation frequency, water potential, stomatal conductance, transpiration, shoot elongation, and photosynthetic rate of irrigated seedlings compared with adjacent controls. Although these data support the hypothesis that water stress inhibits nodulation. it is unclear whether this is because of an effect of soil moisture on the nodulation capacity of the soils (i.e. on the size and physiological state of the soil Frankia population) or to a host plant response to drought which might prevent actinorhizal root infection and/or nodule development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1997.tb05371.x
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  • 6
    Electronic Resource
    Electronic Resource
    Long-term potentiation in awake mutant mice (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 387 (1997), S. 666-667 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The relationship between long-term potentiation (LTP) and spatial learning has been explored in a variety of genetically engineered mice with deletions of specific genes. With few exceptions, LTP in these animals has been studied in the hippocampal slice preparation. The conditions required to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/387666a0
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  • 7
    Electronic Resource
    Electronic Resource
    Biphenyl-2,2'-dicarboxylic acid (diphenic acid) (1987)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 1615-1618 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270187090875
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  • 8
    Electronic Resource
    Electronic Resource
    Pharmaceutical progress (1987)
    [s.l.] : Nature Publishing Group
    Nature 329 (1987), S. 371-371 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Anti-Cancer Drug Design. Editors Stanley Crooke, Stephen Neidle and Shigeru Tsukagoshi. Macmillan, London. 4/yr. UK £55; elsewhere £75. Drug Design and Delivery. Editor J.S. Morley. Harwood. 4 issues per volume. $286 (institutional); $194 (libraries). THE greater understanding of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/329371a0
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  • 9
    Electronic Resource
    Electronic Resource
    Characterisation of the low affinity interaction between rat cell adhesion molecules CD2 and CD48 by analytical ultracentrifugation (1997)
    Springer
    European biophysics journal 25 (1997), S. 455-462 
    Details
    ISSN: 1432-1017
    Keywords: Key words T-lymphocytes ; Dissociation constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract CD2 is a cell adhesion molecule found on the plasma membrane of T-lymphocytes. Its counter-receptor in rat is the structurally related CD48. This interaction is believed to contribute to the adhesion of T-cells to other cells such as cytotoxic targets and antigen presenting cells. Cell-cell adhesion involves the formation of multiple cell adhesion molecule complexes at the cell surface and if cell-cell de-adhesion is to occur, these complexes need to be disrupted. The affinities of cell adhesion molecule interactions are suggested to be relatively weak to allow this de-adhesion of cell-cell interactions. The CD2/CD48 interaction has been studied using recombinant extracellular proteins and the affinity of the interaction of soluble recombinant rat CD2–CD48 has been determined (at 37°C) using surface plasmon resonance (and shown to be weak), with the dissociation constant Kd=60–90 µm. The values determined by surface plasmon resonance results could be affected by the immobilisation of the ligand on the chip and any self-association on the chip. We used three different analytical ultracentrifuge procedures which each allowed the interaction to be studied in free solution without the need for an immobilisation medium. Both sedimentation equilibrium (using direct analysis of the concentration distribution and also modelling of molecular weight versus concentration data) and sedimentation velocity at 5°C yielded dissociation constants in the range of 20– 110 µm, supporting the surface plasmon resonance findings showing that binding between these cell adhesion molecules is relatively weak. These studies also ruled out the presence of any significant self-association of the reactants which could lead to systematic error in the surface plasmon resonance results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002490050060
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  • 10
    Electronic Resource
    Electronic Resource
    Activation of the Mononuclear Phagocyte System by Poloxamine 908: Its Implications for Targeted Drug Delivery (1997)
    Springer
    Pharmaceutical research 14 (1997), S. 1629-1633 
    Details
    ISSN: 1573-904X
    Keywords: mononuclear phagocyte system ; targeted drug delivery ; nanoparticles ; poloxamine 908
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. To investigate the effect of poloxamine 908 on the MPS activity and the importance of its mode of presentation to the immune system. Methods. Solutions of endotoxin free poloxamine 908 were injected daily intravenously to rats, and the effect on the degree of sequestration by the liver of I125 labelled, poloxamine 908-coated 60 nm polystyrene particles was investigated by studying effect of dosing regimen(s) and assessment of opsonic activity. Results. After 3 or 4 days repeated dosing with poloxamine 908 (0.7 mg) in solution, the poloxamine 908-coated polystyrene particles (60 nm) were rapidly cleared from the circulation. The increased sequestration of the particles by the liver lasted for more than 7 days after last dosing with the poloxamine 908 solution. In subsequent studies, it was found that a single dose of poloxamine 908 (0.7 mg) in solution was sufficient to activate the MPS 4 days after the injection. The increased uptake was found not be mediated by a serum component, nor was it due to proliferation of the Kupffer cells in the liver. Conclusions. The results provide evidence that a solution of endotoxin-free poloxamine 908 activates the MPS so that 4 days after injection otherwise long-term circulating poloxamine 908-coated particles are sequestered by the liver. This finding has implications for use of such coated systems in therapeutic situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012194721763
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