ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

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A study of quasi-periodic ELF-VLF emissions at three Antarctic stations: evidence for off-equatorial generation? (1994)

Morrison, K. ; Engebretson, M. J. ; Beck, J. R. ; [et al.]

Springer

Annales geophysicae 12 (1994), S. 139-146

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ISSN: 0992-7689

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences , Physics

Notes: Abstract The spatial extent and temporal behaviour of quasi-periodic (QP) intensity modulations of 0.5-2 kHz ELF-VLF signals were investigated in a comparative study of data collected at the Antarctic stations of South Pole (L=14), Halley (L=4), and Siple (L=4). Frequently, the waveforms of ELF-VLF signals simultaneously received at each site were identical. Although of similar frequency structure, the waveforms of the accompanying Pc3 magnetic pulsations did not show a one-to-one association. Whereas both are dayside phenomena, QP emissions occur over a smaller range of local times, and have a maximum of occurrence later in the day closer to local noon. QP emissions are identified with the periodic modulation of the electron pitch-angle distribution by the propagation of ULF compressional fast-mode waves through a region. However, contrary to previous ideas, rising-tone emissions do not represent the frequency-time signatures of such waves. In addition to generation close to the equatorial plane, we propose an additional high-latitude source of QP emissions. These emissions are associated with regions of minimum B produced by the dayside compression of the magnetosphere close to the magnetopause. Model magnetic field calculations of these minimum-B regions as a function of magnetic local time and invariant latitude are presented.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s00585-994-0139-8

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2

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Production and crystallization of virus-like particles assembled in a heterologous protein expression system (1994)

McKinney, B. R. ; Agrawal, D. ; Fisher, A. J. ; [et al.]

Copenhagen : International Union of Crystallography (IUCr)

Acta crystallographica 50 (1994), S. 351-354

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ISSN: 1399-0047

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Chemistry and Pharmacology , Geosciences , Physics

Notes: It is of considerable interest to separate the processes of viral infectivity and virion assembly. Until recently this has only been possible with viruses that could be disassembled and reassembled in vitro. Even in these cases it was difficult to establish the authenticity of reassembled capsid protein because of possible irreversible damage that may have occurred to the protein during disassembly. An ideal method for the study of virus assembly is a protein expression system in which conditions are appropriate for spontaneous particle formation from freshly synthesized polypeptides. The baculovirus expression system has proven to be an excellent means to this end. Recently, this approach has been used to study the T = 3 Flock House insect virus and it has been demonstrated that subunits with the wild-type protein sequence, and with site-specific mutations that prevent particle maturation, will assemble and crystallize. This same approach has now been used at Purdue to study the T = 4 Nudaurelia ω capensis insect virus. There is no cell culture system currently available for the study of NωV, thus the expression system provides the first opportunity to study assembly under controlled conditions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S090744499400123X

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3

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A monoclinic crystal with R32 pseudo-symmetry: a preliminary report of Nodamura virus structure determination (1993)

Zlotnick, A. ; McKinney, B. R. ; Munshi, S. ; [et al.]

Copenhagen : International Union of Crystallography (IUCr)

Acta crystallographica 49 (1993), S. 580-587

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ISSN: 1399-0047

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Chemistry and Pharmacology , Geosciences , Physics

Notes: We have crystallized Nodamura virus, a T = 3 icosahedral virus that can infect both mammalian and insect hosts. Crystals are monoclinic, with two crystallographically independent virus molecules per asymmetric unit. Packing analysis reveals a pseudo-rhombohedral (pseudo-C2 in the monoclinic setting) arrangement of virus particles in the crystal lattice. Crystals differ from the R32 symmetry by rotational and translational deviations. The rhombohedral packing arrangement and its failure to describe the exact virus packing is analyzed in detail. The icosahedral threefold axis is rotated from the body diagonal of the pseudo-rhombohedral cell, breaking the rhombohedral symmetry. The C2 pseudo-symmetry breaks down rotationally and/or translationally.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S0907444993007498

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4

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Crystallization and preliminary data analysis of flock house virus (1992)

Fisher, A. J. ; McKinney, B. R. ; Wery, J. P. ; [et al.]

Copenhagen : International Union of Crystallography (IUCr)

Acta crystallographica 48 (1992), S. 515-520

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ISSN: 1600-5740

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/S0108768192000053

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5

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An insect model for assessing mercury toxicity: Effect of mercury on antioxidant enzyme activities of the housefly (Musca domestica) and the cabbage looper moth (Trichoplusia ni) (1994)

Zaman, K. ; MacGill, R. S. ; Johnson, J. E. ; [et al.]

Springer

Archives of environmental contamination and toxicology 26 (1994), S. 114-118

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ISSN: 1432-0703

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine

Notes: Abstract The effect of mercury as Hg2Cl2 and HgCl2 on the antioxidant enzyme levels and its toxicity was investigated in an insect model comprised of adult females of the common housefly, Musca domestica, and fourth-instar larvae of the cabbage looper moth, Trichoplusia ni. HgCl2 was found to be more toxic than Hg2Cl2 to both M. domestica and T. ni. The LC50s for M. domestica were 1.17% and 0.38% w/v concentration for Hg2Cl2 and HgCl2, respectively. For the more tolerant T. ni, the LC50s were 5.15% for Hg2Cl2 and 0.96% w/w concentration for HgCl2. The minimally acute LC5 dose of both oxidation states of Hg was approximately 0.005% for both insects (w/v for M. domestica and w/w for T. ni). At the LC5, both forms of Hg significantly induced the activity of superoxide dismutase in both insect species. Catalase was induced by both Hg2Cl2 and HgCl2 in M. domestica but was only induced by HgCl2 in T. ni. Glutathione-S-transferase, its peroxidase activity, and glutathione reductase activites were also significantly altered in most cases by Hg in both insects although the pattern of alteration was different between the two insects. It is evident that mercury induces oxidative stress in insects as it does in vertebrates. Our findings suggest that insects may serve as a valuable, non-mammalian model species to assess Hg-induced oxidative stress as a component of environmental toxicity.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00212802

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6

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Interactions of proteins with uniform colloidal hematite and chromium hydroxide particles. II. Stability and mobility (1992)

Johnson, J. E. ; Matijević, E.

Springer

Colloid & polymer science 270 (1992), S. 364-369

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ISSN: 1435-1536

Keywords: Electrokinetics of proteins ; flocculation by proteins ; protein coatings ; protein/metal oxides

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Stability of hematite and chromium hydroxide particles covered by ovalbumin, γ-globulin, and lysozyme, respectively, and mobilities of the same coated particles in aqueous media were investigated as a function of the pH, ionic strenght [NaNO3, Mg(NO3)2], and the amount of added proteins. It was found that ovalbumin causes electrosteric stabilization of dispersions at pH values other than 5, while flocculation occurred at pH 5 (which was the i.e.p. of the coated particles). Mobility curves of ovalbumin covered particles resembled those of the pure protein. Dispersions with γ-globulin flocculated at and around the i.e.p. of the macromolecule (pH≈7). The mobility curves of γ-gobulin-coated sols were intermediate between those of the protein and of the cores, and were dependent upon the amount of adsorbed γ-globulin. Heterocoagulation was observed for both hematite and chromium hydroxide dispersions with lysozyme. Mobilities of lysozyme covered particles were between those of the cores and of the protein, but were not dependent upon the quantity of adsorbed polymer.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00655851

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7

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Interactions of proteins with uniform colloidal hematite and chromium hydroxide particles. I. Adsorption (1992)

Johnson, J. E. ; Matijević, E.

Springer

Colloid & polymer science 270 (1992), S. 353-363

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ISSN: 1435-1536

Keywords: Adsorption ofproteins ; albumin ; chromiumhydroxide ; γ-globulin ; hematite ; lysozyme

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The adsorption of ovalbumin, γ-globulin, and lysozyme on uniform spherical hematite and chromium hydroxide particles in aqueous media has been studied as a function of the pH at a constant ionic strength. The uptake of ovalbumin and γ-globulin was greatest at their isoelectric points and differed little at 10−2 and 10−3 mol dm−3 NaNO3. The adsorption of lysozyme was strongly influenced by the ionic strength. The deposition of ovalbumin on hematite in the presence of Mg (NO3)2 was significantly greater than that with NaNO3 under otherwise comparable conditions. Dialysis experiments with ovalbumin against magnesium nitrate solutions showed Mg2+ to be specifically bound to the protein. The shapes of isotherms indicated monolayer coverage for ovalbumin and multilayer coating for lysozyme for both adsorbents. The shapes of isotherms of γ-globulin on hematite point to a rearrangement of the protein on the particle surface, while a monolayer was found on chromium hydroxide particles.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00655850

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8

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The biogeochemical sulfur cycle in the marine boundary layer over the Northeast Pacific Ocean (1990)

Bates, T. S. ; Johnson, J. E. ; Quinn, P. K. ; [et al.]

Springer

Journal of atmospheric chemistry 10 (1990), S. 59-81

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ISSN: 1573-0662

Keywords: Dimethylsulfide ; sulfate ; sulfur dioxide ; methane sulfonate ; biogeochemical sulfur cycle ; air-sea exchange

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Geosciences

Notes: Abstract The major components of the marine boundary layer biogeochemical sulfur cycle were measured simultaneously onshore and off the coast of Washington State, U.S.A. during May 1987. Seawater dimethylsulfide (DMS) concentrations on the continental shelf were strongly influenced by coastal upwelling. Concentration further offshore were typical of summer values (2.2 nmol/L) at this latitude. Although seawater DMS concentrations were high on the biologically productive continental shelf (2–12 nmol/L), this region had no measurable effect on atmospheric DMS concentrations. Atmospheric DMS concentrations (0.1–12 nmol/m3), however, were extremely dependent upon wind speed and boundary layer height. Although there appeared to be an appreciable input of non-sea-salt sulfate to the marine boundary layer from the free troposphere, the local flux of DMS from the ocean to the atmosphere was sufficient to balance the remainder of the sulfur budget.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01980038

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9

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Foliar nutrient comparisons of pitch pine, loblolly pine, and the pitch × loblolly hybrid (1991)

Johnson, J. E. ; Burger, J. A. ; Rathfon, R. A. ; [et al.]

Springer

Plant and soil 132 (1991), S. 1-9

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ISSN: 1573-5036

Keywords: foliar analysis ; nutrients ; Pinus rigida Mill. ; Pinus rigida × taeda ; Pinus taeda L.

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Foliar analysis was conducted to determine the differences between macronutrient concentrations and contents of current year's fascicles of loblolly pine (Pinus taeda L.), pitch pine (P. rigida Mill.), and first (F1) and second (F2) generation plantations of the pitch × loblolly hybrid (P. rigida × taeda). No significant differences in foliar P, K, Ca, and Mg concentrations were found between any of the species or hybrid families tested. Foliar N concentration differed among F1 families, but not among the F2 families. Foliar N concentrations of loblolly and pitch pine in the F1 plantation were not significantly different. Fascicles of pitch pine tended to be shorter and lighter than those of loblolly pine and the hybrids, and nutrient contents of pitch pine foliage tended to be slightly less. An assessment of site effects on tree growth and nitrogen nutrition in the F1 plantation revealed that the hybrids respond differently to an enriched site. Six of the eight species and hybrids had higher foliar N contents on the better quality site, while four had increased stem volumes.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00011006

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