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  • 1
    Electronic Resource
    Electronic Resource
    Interface profiles in a dimerizing system (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 2387-2394 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The gas–liquid density profile and surface tension are calculated for a fluid possessing hard sphere repulsion, van der Waals-like dispersion, and sticky-spot attraction. The sticky spot allows monomers to dimerize and the consequences of which are investigated. Association is treated with Wertheim's thermodynamic perturbation theory and the direct correlation functions are derived by means of the Ornstein–Zernike equations for associating systems. The primary effect of association is to shift the critical temperatures and densities from those of a nonassociating fluid. While there are small, nonmonotonic shifts in the correlation length and surface tension, accompanied by an interface composition change, these effects on the density profile seem to be subsumed in the use of the proper T/Tc. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1338532
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  • 2
    Electronic Resource
    Electronic Resource
    Steady, three-dimensional, internally heated convection (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1928-1932 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical calculations have been carried out of steady, symmetric, three-dimensional modes of convection in internally heated, infinite Prandtl number, Boussinesq fluids at a Rayleigh number of 1.4×104 in a spherical shell with inner/outer radius of 0.55 and in a 3×3×1 rectangular box. Multiple patterns of convection occur in both geometries. In the Cartesian geometry the patterns are dominated by cylindrical cold downflows and a broad hot upwelling. In the spherical geometry the patterns consist of cylindrical cold downwellings centered either at the vertices of a tetrahedron or the centers of the faces of a cube. The cold downflow cylinders are immersed in a background of upwelling within which there are cylindrical hot concentrations (plumes) and hot halos around the downflows. The forced hot upflow return plumes of internally heated spherical convection are fundamentally different from the buoyancy-driven plumes of heated from below convection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858818
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  • 3
    Electronic Resource
    Electronic Resource
    Turbulent 3-D thermal convection in an infinite Prandtl number, volumetrically heated fluid: implications for mantle dynamics (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 116 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The structure and time dependence of 3-D thermal convection in a volumetrically heated, infinite Prandtl number fluid is examined for high values of the Rayleigh number. The methods employed allow the numerical experiments to proceed for long-enough times to derive good estimates of mean and fluctuating parts of the structure. An iterative multirigid method to solve for the buoyant, incompressible viscous flow at each time step of the energy equation is a novel aspect of the methodology. A simple explicit time step of the energy equation is utilized that vectorizes well on serial computers and which is ideally suited to massively parallel computers. Numerical experiments were carried out for Rayleigh numbers from 3 × 106 to 3 × 107 in a cartesian region with a prescribed temperature at the top boundary and an adiabatic bottom boundary. Over this complete range of Rayleigh number, the flow structure consists dominantly of cold, nearly axisymmetric plumes that migrate horizontally sweeping off the cold thermal-boundary layer that forms at the top of the convecting fluid. Plumes disappear by coalescing with other plumes; new plumes are created by thermal-boundary-layer instability. Sheet plumes form only occasionally and do not penetrate to significant depths in the fluid. Plumes have sizes comparable to the thickness of the thermal-boundary layer and an average spacing comparable to the fluid depth. No persistent large-scale motion in the fluid can be identified. Its absence may reflect the large subadiabatic stratification that develops beneath the thermal-boundary layer as cold plumes penetrate to the bottom boundary without thermally equilibrating with surrounding fluid. We consider the possible implications for convection in planetary mantles and for the existence of plate tectonics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb01795.x
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  • 4
    Electronic Resource
    Electronic Resource
    Gene dosage for isocitrate dehydrogenase in mouse embryos trisomic for chromosome 1 (1977)
    [s.l.] : Nature Publishing Group
    Nature 267 (1977), S. 615-616 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Metaphase spreads from membranes of trisomic mouse embryos prepared as described by Evans et a.15, a, Trisomy 1; b, trisomy 12. The two metacentric chromosomes indicative of the trisomic state are indicated by arrows in each spread. Males doubly heterozygous for two different metacentric ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/267615a0
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  • 5
    Electronic Resource
    Electronic Resource
    Nitrogen mineralization in boreal forest stands of isle royale, Northern Michigan (1995)
    Springer
    Water, air & soil pollution 82 (1995), S. 191-202 
    Details
    ISSN: 1573-2932
    Keywords: nitrogen mineralization ; boreal forest ; northern Michigan ; nitrogen cycle ; climate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The correlation of soil temperature and moisture with inorganic N concentrations and net mineralization beneath major species types in mature boreal and northern hardwood forests was examined over a two year period. Soils beneath species types where the canopy was dominated byBetula papyrifera, Picea glauca, Alnus rugosa or, in northern hardwoods,Acer saccharum were studied. Net NO3 − mineralization varied by species type and net total inorganic nitrogen (N) mineralization varied by month and the interaction of species type with month. Soil NO3 − concentration and NO3 − mineralization were correlated for spruce, and inversely correlated for alder and maple. Soil NH4 + concentration and NH4 + mineralization were inversely correlated for alder and maple. In laboratory temperature and moisture treatments of birch, spruce and maple soils, NH4 + and total inorganic N-mineralization increased with temperature. The response to moisture was most evident for NO3 − mineralization in maple soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182833
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  • 6
    Electronic Resource
    Electronic Resource
    Identification of three N-linked glycans in the V4–V5 region of HIV-1 gp 120, dispensable for CD4-binding and fusion activity of gp 120 (1994)
    Springer
    Archives of virology 134 (1994), S. 335-344 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Site-directed mutagenesis was used to study the biological significance of three N-linked glycans (linked to Asn 406, Asn 448, and Asn 463), situated in the CD4-binding region of gp120. Mutagenesis was carried out in a phage M13 system, and the mutatedenv genes were inserted into recombinant vaccinia virus (r-vaccinia virus). To evaluate if the level of expression affected the biological phenotype of mutant gp 120, we expressed the envelope glycoproteins using either a weak (7.5 K) or a strong (11 K) promoter of vaccinia virus. The expression of mutatedenv proteins was analyzed after infecting CD4-expressing HeLa cells with the r-vaccinia virus, by monitoring the ability of the infected cells to generate CD4-dependent syncytia.Env gene products lacking all three glycans as well asenv gene products lacking different permutations of one or two glycans were analyzed. All mutated gp 120 species had the expected electrophoretical mobility as anticipated from elimination of one, two, and three N-linked glycans, respectively. Moreover, all mutantenv gene products demonstrated the same capacity to induce formation of syncytia, irrespective of using the weak or strong promoter for expression. These data indicate that the three N-linked glycans studied are dispensable for HIVenv gene products to function in CD4-binding and the subsequent fusion step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01310571
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