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  • 1
    Electronic Resource
    Electronic Resource
    A comparison of three-dimensional multimode hydrodynamic instability growth on various National Ignition Facility capsule designs with HYDRA simulations (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 1125-1132 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Three similar cryogenic ignition capsule designs for the National Ignition Facility [J. Lindl, Phys. Plasmas 2, 3933 (1995)] are analyzed to determine surface roughness specifications required to mitigate the growth of hydrodynamic instabilities. These capsule utilize brominated plastic, polyimid and copper-doped beryllium ablator materials respectively. Direct three-dimensional numerical simulations with the HYDRA radiation hydrodynamic code [M. M. Marinak et al., Phys. Plasmas 3, 2070 (1996)] examine the growth of multimode perturbations seeded by roughness on the outer ablator and inner ice surfaces. The simulations, which showed weakly nonlinear behavior for optimized surfaces, were carried through ignition and burn. A three-dimensional multimode perturbation achieves somewhat larger amplitudes in the nonlinear regime than a corresponding two-dimensional simulation of the same rms amplitude. The beryllium and polyimid capsules exhibit enhanced tolerance of roughness on both the ice and ablator surfaces. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872643
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  • 2
    Electronic Resource
    Electronic Resource
    Lanthanide-Labeled Clay: A New Method for Tracing Sediment Transport in Karst (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 36 (1998), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Mobile sediment is a fundamental yet poorly characterized aspect of mass transport through karst aquifers. Here the development and field testing of an extremely sensitive particle tracer that may be used to characterize sediment transport in karst aquifers is described. The tracer consists of micron-size montmorillonite particles homoionized to the lanthanide form; after injection and retrieval from a ground water system, the lanthanide ions are chemically stripped from the clay and quantified by high performance liquid chromatography. The tracer meets the following desired criteria: low detection limit; a number of differentiable signatures; inexpensive production and quantification using standard methods; no environmental risks; and hydrodynamic properties similar to the in situ sediment it is designed to trace. The tracer was tested in laboratory batch experiments and field tested in both surface water and ground water systems. In surface water, arrival times of the tracer were similar to those of a conservative water tracer, although a significant amount of material was lost due to settling. Two tracer tests were undertaken in a karst aquifer under different flow conditions. Under normal flow conditions, the time of arrival and peak concentration of the tracer were similar to or preceded that of a conservative water tracer. Under low flow conditions, the particle tracer was not detected, suggesting that in low flow the sediment settles out of suspension and goes into storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1998.tb02202.x
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  • 3
    Electronic Resource
    Electronic Resource
    Protein kinase C regulates the nuclear localization of diacylglycerol kinase-ζ (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 394 (1998), S. 697-700 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Diacylglycerol kinases (DGKs) terminate signalling from diacylglycerol by converting it to phosphatidic acid. Diacylglycerol regulates cell growth and differentiation, and its transient accumulation in the nucleus may be particularly important in this regulation,. Here we show that a fraction ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/29337
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  • 4
    Electronic Resource
    Electronic Resource
    Choices and Consequences of Oviposition by Hylemya (Delia) Sp. (Diptera: Anthomyiidae) (1998)
    Springer
    Journal of insect behavior 11 (1998), S. 371-381 
    Details
    ISSN: 1572-8889
    Keywords: oviposition behavior ; host selection ; offspring performance ; predispersal seed predation ; Anthomyiidae ; Hylemya ; Delia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hylema sp. 5 females oviposit on the undersides of sepals of developing buds of both Ipomopsis aggregata and Polemonium foliosissimum. Eggs deposited on the latter are significantly more likely to be fully protected by the sepal than are eggs deposited on the former. Unexposed eggs have a significantly greater likelihood of successfully developing to the larval stage than do exposed eggs. The difference in frequency of egg exposure on the two plant species can be attributed to differences in sepal morphology: I. aggregata sepals are significantly narrower than those of P. foliosissimum. The hypothesis that females preferentially oviposit on larger flowers was unconfirmed by a manipulative choice experiment. Plants differing in the size of their flowers were potted together and presented to Hylemya in arrays in the field. Flowers of the larger-flowered pair were no more likely to be oviposited on than flowers of the smaller-flowered pair. However, there were significant negative correlations between the corolla length and the percentage of flowers laid on per day at each of two sites. There was also a significant positive correlation between the corolla width and the percentage of flowers laid on at one site. Thus females appear to be using some measure of flower morphology, or a correlated trait, in making oviposition decisions. The degree to which Hylemya is making suboptimal choices between host plant species is discussed and requires further examination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020902714225
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental Studies of Shear Deformation of Mantle Materials: Towards Structural Geology of the Mantle (1998)
    Springer
    Pure and applied geophysics 151 (1998), S. 589-603 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Simple shear deformation, structural geology, seismic anisotropy, partial melting, lattice preferred orientation, shear localization.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —A brief outline is given on experimental studies carried out in the Minnesota Mineral and Rock Physics Laboratory of microstructural evolution and rheology of mantle mineral aggregates or their analogues, using a simple shear deformation geometry. A simple shear deformation geometry allows us to unambiguously identify controlling factors of microstructural evolution and to obtain large strains at high pressures and temperatures, and thus provides a unique opportunity to investigate the "structural geology of the mantle." We have developed a simple shear deformation technique for use at high pressures and temperatures (pressure up to 16 GPa and temperature up to 2000 K) in both gas-medium and solid-medium apparati. This technique has been applied to the following mineral systems (i) olivine aggregates, (ii) olivine basaltic melt, (iii) CaTiO3 perovskite aggregates. The results have provided important data with which to understand the dynamics of the earth’s mantle, including the geometry of mantle convection, mechanisms of melt distribution and migration beneath mid-ocean ridges, and the mechanisms of shear localization. Limitations of laboratory studies and future directions are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050131
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  • 6
    Electronic Resource
    Electronic Resource
    Report On ‘Chemistry in a Biological Context’ (1998)
    Springer
    The chemical educator 3 (1998), S. 1-12 
    Details
    ISSN: 1430-4171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The American Chemical Society has started its first large-scale project related to opening up new options for undergraduate majors. Tentatively titled ‘Chemistry in a Biological Context,’ the work has only just begun. Participants are invited to provide early feedback into the nature and shape of the project.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00897980177a
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  • 7
    Electronic Resource
    Electronic Resource
    Report On ‘ChemLinks: Changing the Way Students Learn Chemistry’ (1998)
    Springer
    The chemical educator 3 (1998), S. 1-13 
    Details
    ISSN: 1430-4171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract ChemLinks is a collaborative effort by over seventy active participants from twenty-four academic institutions to write, test, and disseminate topical modules to be used to teach chemistry in the first and second years of the college curriculum. Twenty-four modules are currently under development and an additional seven will be started this year. In this workshop the leaders discussed the plan and philosophy behind this project and presented components from two modules as examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00897980171a
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  • 8
    Electronic Resource
    Electronic Resource
    Report On ‘Comprehensive Curricular Change at a Small Liberal Arts College: Bioorganic First at Juniata College’ (1998)
    Springer
    The chemical educator 3 (1998), S. 1-13 
    Details
    ISSN: 1430-4171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Because the conceptual basis of the curriculum is that the majority of the students are not chemists, participants in this session examined which aspects of organic chemistry are really necessary for a nonchemical (mostly biological) audience. Participants learned about Juniata’s solution to this curriculum problem and considered whether any of the ideas are useful in other settings. An important consideration is whether the curriculum is indivisible or whether certain parts can be adopted without others. Particular examples from the Juniata curriculum were described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00897980165a
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  • 9
    Electronic Resource
    Electronic Resource
    Trends of Contaminants and Effects in Bald Eagles of the Great Lakes Basin (1998)
    Springer
    Environmental monitoring and assessment 53 (1998), S. 197-212 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Bald eagle (Haliaeetus leucocephalus) numbers in North America have increased since the ban of DDT and other organochlorine compounds in the 1970s. The decrease in the environmental concentrations of p,p′-DDE has lead to the lessening of egg-shell thinning and has been a major reason for the current resurgence of bald eagle populations in temperate North America, however, this recovery has not been uniform. Eagles nesting along the shorelines and islands of the Great Lakes have continued to experience impaired productivity. In order to examine some of the reasons for the current recovery of bald eagles in the Great Lakes Basin and the potential use of eagles as a bioindicator species of Great Lakes water quality, we analyzed trends in reproductive activity, concentrations of PCBs and p,p′-DDE in unhatched eggs, and rates of developmental deformities. Numbers of occupied nests, fledged young, and yearly productivity rates have increased across the basin. No trends have been observed in changes in the concentrations of p,p′-DDE nor Total PCBs in unhatched eggs. An increasing rate in the incidence of developmental deformities in nestlings has been observed in Michigan. The recovery of the bald eagle population along the Great Lakes is most likely due to immigration of relatively uncontaminated adults from Interior regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006068330050
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  • 10
    Electronic Resource
    Electronic Resource
    The coat proteins and putative movement proteins of isolates of Prunus necrotic ringspot virus from different host species and geographic origins are extensively conserved (1998)
    Springer
    European journal of plant pathology 104 (1998), S. 155-161 
    Details
    ISSN: 1573-8469
    Keywords: PNRSV ; ApMV ; Ilarvirus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A complete sequence for the RNA 3 of Prunus necrotic ringspot virus (PNRSV) is described (Genbank Accession U57046). Primers from this sequence were used to amplify both the movement protein and coat protein genes of 3 other isolates of PNRSV originating from different host species and geographic locations. Comparisons of these sequences with those of other published sequences for PNRSV and the closely related apple mosaic virus (ApMV) showed that both the movement proteins and coat proteins of isolates of PNRSV are extensively conserved irrespective of either the original host or the geographic origin. The movement protein and coat protein of ApMV and PNRSV are sufficiently conserved to suggest that these two viruses may have evolved from a common ancestor. The amino acid sequence of the two coat proteins shows areas of similarity and difference that would explain the serological continuum reported to occur among isolates of these two viruses. Nevertheless, the movement protein and coat protein of the two viruses are sufficiently different so that ApMV and PNRSV should be considered to be distinct viruses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008668129926
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