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  • 1
    Electronic Resource
    Electronic Resource
    Preliminary X-ray crystallographic analysis of human salivary cystatin (1996)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 869-870 
    Details
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Human salivary cystatin, a thiol proteinase inhibitor, has been implicated in potential antimicrobial and antiviral functions of saliva. A variant of human salivary cystatin SN expressed and purified in an Escherichia coli expression system lacking residues 12–16 near the N-terminus (Δ12–16) has been crystallized by the vapor-diffusion technique. The crystals are of the hexagonal space group P622 and have cell constants of a = 85.41, b = 85.41, c = 131.6 Å, α = β = 90, γ = 120°, and contain two molecules of molecular weight 13 500 per asymmetric unit. The crystals diffract up to a resolution of 2.2 Å and are suitable for X-ray diffraction analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S090744499600323X
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  • 2
    Electronic Resource
    Electronic Resource
    Radioactivities Made in Supernovae (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 759 (1995), 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.1749-6632.1995.tb17569.x
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  • 3
    Electronic Resource
    Electronic Resource
    Two-dimensional patterns of metamorphic fluid flow and isotopic resetting in layered and fractured rocks‘pa (1997)
    Oxford, UK : Blackwell Science Ltd.
    Journal of metamorphic geology 15 (1997), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: One-dimensional advection-dispersion models predict that characteristic δ18O vs. distance and δ18O vs. δ13C profiles should be produced during isothermal metamorphic fluid flow under equilibrium conditions. However, the patterns of isotopic resetting in rocks that have experienced fluid flow are often different from the predictions. Two-dimensional advection-dispersion simulations in systems with simple geometries suggest that such differences may be as a result of fluid channelling and need not indicate disequilibrium, high dispersivities, or polythermal flow. The patterns of isotopic resetting are a function of: (1) the permeability contrast between more permeable layers (‘channels’) and less permeable layers (‘matrix’); (2) the width and spacing of the channels; (3) the width and spacing of discrete fractures; and (4) the orientation of the pressure gradient with respect to layering. In fractured systems, the efficiency of isotopic transport depends on the fracture aperture and the permeability of the surrounding rock. Resetting initially occurs along and immediately adjacent to the fractures, but with time isotopic resetting because of flow through the rock as a whole increases in importance. Application of the one-dimensional advection-dispersion equations to metamorphic fluid flow systems may yield incorrect estimates of fluid fluxes, intrinsic permeabilities, dispersivities, and permeability contrasts unless fluid flow occurred through zones of high permeability that were separated by relatively impermeable layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1525-1314.1997.00036.x
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of weak layers on particle velocity measurements (1997)
    Springer
    Rock mechanics and rock engineering 30 (1997), S. 1-18 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Summary Results are presented from a testing program to study the effect weak layers embedded in a strong rock strata have on particle velocity when subjected to explosive loading. A similar computational study had been conducted earlier with WONDY — a finite difference Langrangian code developed at Sandia National Laboratory. The experiments were conducted using models fabricated from Hydrocal containing a single dry sand layer or clay layer through which the stress wave traveled. Particle velocity was measured in front of and past the weak layer to determine attenuation, pulse shape changes, and displacement loss. The results from the model testing indicated that particle velocity amplitude decreased significantly when the stress wave passed through the weak layer. The velocity pulse width on the other hand was found to remain relatively constant when passing through the weak layer. The computational results from WONDY predicted similar behavior and hence were in good agreement with the tests. In the experiments, the velocity loss across a sand layer was found to be much larger than the loss across a clay layer. The stress wave velocity in the sand layer was found to be significantly smaller than in the Hydrocal while the experimentally determined wave velocity in the clay was nearly equal to the wave velocity in the Hydrocal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020110
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of open gaps on particle velocity measurements (1997)
    Springer
    Rock mechanics and rock engineering 30 (1997), S. 95-111 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Summary Joints and bedding planes are present in nearly all geologic media. These discontinuities vary in the extent to which they are open and the material with which they are filled. The presence of such discontinuities affect the ground motions that result from the detonation of an explosive source. The effects of these discontinuities are especially important if it is desired to predict the size of the explosive source from measurements of ground motion — such as particle velocity or stress. In this paper we present results from a series of model tests conducted to investigate the effect of open gaps on the particle velocity that can be transmitted across them. Electromagnetic velocity gages were used to record particle velocities at several locations on either side of an open gap of known width. The study was restricted to the transmission of particle velocities normal to the gap and to the case where the gap was located in a region for which the stress was high but not greatly above the elastic limit of the material. The experimental results were compared qualitatively to results obtained from WONDY — a one dimensional Lagrangian finite difference code. Although the tests were conducted in laboratory models, the results can be scaled to compare to the full scale situation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020127
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  • 6
    Electronic Resource
    Electronic Resource
    Dried leaves from rocky mountain plants decrease infestation by stored-product beetles (1995)
    Springer
    Journal of chemical ecology 21 (1995), S. 127-142 
    Details
    ISSN: 1573-1561
    Keywords: Insecticide ; fumigant ; terpenoids ; Coleoptera ; Bruchidae ; Curculionidae ; camphor ; carvacrol ; Monarda fistulosa ; Artemisia tridentata ; Zabrotes subfasciatus ; Sitophilus oryzae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Leaves of two highly aromatic plants,Artemisia tridentata (Nutt.) andMonarda fistulosa L., prepared according to a patented process, inhibited oviposition by the Mexican bean weevil,Zabrotes subfasciatus (Boheman), in beans at concentrations less than 1% w/w. Both plant species were less effective against the rice weevil,Sitophilus oryzae L., in wheat, with onlyM. fistulosa exhibiting any concentration-dependent activity. The maximal control achieved against this species was less than 50% at 3% w/w. Two less aromatic plant species,Balsamorhiza sagittata (Pursh.) Nutt. andGeranium viscosissimum Fisch. and Mey., caused only low levels of inhibition against both insect species. Volatiles probably caused the response toA. tridentata andM. fistulosa, while the asymptotic concentration dependence for the less volatile plant material was likely caused by behavioral factors related to the physical presence of foreign particulate matter in the foodstuff. Chemical analysis indicated that most of the volatile components from the dried leaf material from all species were terpenoids, with camphor (9.7 mg/g) and 1,8-cineole (4.0 mg/g) being most abundant inA. tridentata and carvacrol (26.3 mg/g) being most abundant inM. fistulosa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02036647
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