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  • Springer  (88)
  • American Physical Society  (27)
  • International Union of Crystallography  (25)
  • Blackwell Science Ltd
  • 2000-2004  (36)
  • 1990-1994  (106)
  • 2002  (36)
  • 1993  (106)
  • 1
    Digitale Medien
    Digitale Medien
    CsrA regulates glycogen biosynthesis by preventing translation of glgC in Escherichia coli (2002)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 44 (2002), S. 0 
    Details
    ISSN: 1365-2958
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: The carbon storage regulatory system of Escherichia coli controls the expression of genes involved in carbohydrate metabolism and cell motility. CsrA binding to glgCAP transcripts inhibits glycogen metabolism by promoting glgCAP mRNA decay. CsrB RNA functions as an antagonist of CsrA by sequestering this protein and preventing its action. In this paper, we elucidate further the mechanism of CsrA-mediated glgC regulation. Results from gel shift assays demonstrate that several molecules of CsrA can bind to each glgC transcript. RNA footprinting studies indicate that CsrA binds to the glgCAP leader transcript at two positions. One of these sites overlaps the glgC Shine–Dalgarno sequence, whereas the other CsrA target is located further upstream in an RNA hairpin. Results from toeprint and cell-free translation experiments indicate that bound CsrA prevents ribosome binding to the glgC Shine–Dalgarno sequence and that this reduces GlgC synthesis. The effect of two deletions in the upstream binding site was examined. Both of these deletions reduced, but did not eliminate, CsrA binding in vitro and CsrA-dependent regulation in vivo. Our findings establish that bound CsrA inhibits initiation of glgC translation, thereby reducing glycogen biosynthesis. This inhibition of translation probably contributes to destabilization of the glgC transcript that was observed previously.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2958.2002.02982.x
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  • 2
    Digitale Medien
    Digitale Medien
    Duration and drift of larval lake sturgeon in the Sturgeon River, Michigan (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of applied ichthyology 18 (2002), S. 0 
    Details
    ISSN: 1439-0426
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1439-0426.2002.00393.x
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  • 3
    Digitale Medien
    Digitale Medien
    Antiproton-proton annihilation at rest into two-body final states (1993)
    Springer
    The European physical journal 58 (1993), S. 175-189 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report measurements of branching ratios for production of a series of two meson final states in $$\bar p$$ p annihilations at rest in liquid hydrogen. We find: $$\begin{gathered} BR(\bar pp \to \pi ^ + \pi ^ - ) = (3.07 \pm 0.13) \cdot 10^{ - 3} \hfill \\ BR(\bar pp \to K^ + K^ - ) = (0.99 \pm 0.05) \cdot 10^{ - 3} \hfill \\ BR(\bar pp \to \pi ^0 \pi ^0 ) = (6.93 \pm 0.43) \cdot 10^{ - 4} \hfill \\ BR(\bar pp \to \pi ^0 \eta ) = (2.12 \pm 0.12) \cdot 10^{ - 4} \hfill \\ BR(\bar pp \to \pi ^0 \omega ) = (5.73 \pm 0.47) \cdot 10^{ - 3} \hfill \\ BR(\bar pp \to \pi ^0 \eta ') = (1.23 \pm 0.13) \cdot 10^{ - 4} \hfill \\ BR(\bar pp \to \eta \eta ) = (1.64 \pm 0.10) \cdot 10^{ - 4} \hfill \\ BR(\bar pp \to \eta \omega ) = (1.51 \pm 0.12) \cdot 10^{ - 2} \hfill \\ BR(\bar pp \to \eta \eta ') = (2.16 \pm 0.25) \cdot 10^{ - 4} \hfill \\ BR(\bar pp \to \omega \omega ) = (3.32 \pm 0.34) \cdot 10^{ - 2} \hfill \\ BR(\bar pp \to \omega \eta ') = (0.78 \pm 0.08) \cdot 10^{ - 2} \hfill \\ \end{gathered}$$ These are the first measurements of the channels ηη′ and ωη′ and in almost all the other channels are more precise than previous results. We also obtain, in a more precise fashion, the following ratios of branching ratios:K + K −/π+π−=0.323±0.013, π0η′/π0η=0.548±0.056, ηη′/ηη=0.31±0.15, ωη′/ωη=0.515±0.040, π0η/π0π0=0.303±0.010, ηη/π0π0=0.232±0.011 and π0ω/ηω=0.377±0.12. The measurements are made for different η and η′ decays, and we thus obtain Γη→3π 0/Γη→γγ=0.841±0.034, and $$\Gamma _{\eta ' \to \gamma \gamma } /\Gamma _{\eta ' \to \pi ^0 \pi ^0 \eta } = 0.091 \pm 0.009$$ .
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01560336
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  • 4
    Digitale Medien
    Digitale Medien
    Parallel continuous Runge-Kutta methods and vanishing lag delay differential equations (1993)
    Springer
    Advances in computational mathematics 1 (1993), S. 367-394 
    Details
    ISSN: 1572-9044
    Schlagwort(e): Delay differential equation ; parallel continuous explicit Runge-Kutta methods ; vanishing lag ; iterated continuous extensions ; primary 65Q05
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract We present an explicit Runge-Kutta scheme devised for the numerical solution ofdelay differential equations (DDEs) where a delayed argument lies in the current Runge-Kutta interval. This can occur when the lag is small relative to the stepsize, and the more obvious extensions of the explicit Runge-Kutta method produce implicit equations. It transpires that the scheme is suitable forparallel implementation for solving both ODEs and more general DDEs. We associate our method with a Runge-Kutta tableau, from which the order of the method can be determined. Stability will affect the usefulness of the scheme and we derive the stability equations of the scheme when applied to the constant-coefficient test DDEu′(t)=λu(t) +μu(t −τ), where the lagτ and the Runge-Kutta stepsizeH n ≡H are both constant. (The caseμ=0 is treated separately.) In the case thatμ ≠ 0, we consider the two distinct possibilities: (i)τ ≥H and (ii)τ〈H.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02072017
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  • 5
    Digitale Medien
    Digitale Medien
    On a functional equation of Aczél and Chung (1993)
    Springer
    Aequationes mathematicae 46 (1993), S. 99-111 
    Details
    ISSN: 1420-8903
    Schlagwort(e): Primary 39B30, 39B70 ; Secondary 46F99
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Summary This paper is concerned mainly with the functional equation (1) $$\sum\limits_{\imath = 0}^m {F_\imath (\alpha _\imath ,x + \beta _i y)} = \sum\limits_{k = 1}^n {G_k (x)H_k (y)} $$ which is a generalization of the Levi-Civita equation (2) $$f(x + y) = \sum\limits_{k = 1}^N {g_k (x)h_k (y).} $$ For complex valued functions of a real variable, Aczél and Chung [1] have shown that (under certain additional natural assumptions) the locally Lebesgue integrable solutions of (1) are exponential polynomials. Jarai [6] has shown that the local integrability assumption can be weakened to measurability. Our aim is to solve distributional analogues of (1) and (2) and thereby obtain another generalization of the result of Aczél and Chung. Essentially, we will show that (1) can be reduced to (2).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01834001
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  • 6
    Digitale Medien
    Digitale Medien
    Response of single antennal neurons of female cabbage loopers to behaviorally active attractants (1993)
    Springer
    Naturwissenschaften 80 (1993), S. 183-186 
    Details
    ISSN: 1432-1904
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01226381
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  • 7
    Digitale Medien
    Digitale Medien
    Hirota polynomials for the KP and BKP hierarchies (1993)
    Springer
    Letters in mathematical physics 29 (1993), S. 55-62 
    Details
    ISSN: 1573-0530
    Schlagwort(e): 58F07 ; 05E05 ; 17B67
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: Abstract Using symmetric function techniques, we derive closed-form expressions for the Hirota polynomials for thepth modified KP and BKP hierarchies in terms of Schur and SchurQ-polynomials, respectively. The Hirota polynomials for the BKP hierarchy can also be expressed as Pfaffians while those for thepth modified KP hierarchies can, under certain conditions, be expressed as determinants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00760859
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  • 8
    Digitale Medien
    Digitale Medien
    Occurrence of fleshy fungi from agricultural fields (1993)
    Springer
    Mycopathologia 122 (1993), S. 29-34 
    Details
    ISSN: 1573-0832
    Schlagwort(e): Agriculture ; Biocontrol ; Residue ; Saprophytes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Thirteen species of fleshy fungi were identified from two agricultural fields during the 1989 and 1990 growing seasons at the Rural Development Center (RDC) and Horticulture Farm, Coastal Plain Experiment Station, Tifton, Georgia. The three most common fungi wereCoprinus plicatilis, Cyathus olla, andPanaeolina foenisecii. At the former site, residue management practices were established for evaluating crop production and at the Horticulture Farm different crops were grown with conservation tillage employing a Low Input Sustainable Vegetable Production system. Tillage treatments at the RDC were no-till, row-till, ridge-plant, and moldboard-plowing. Residue management of triticale included burning or cutting the stubble at a height of 20 or 60 cm at harvest. At the Horticulture Farm, seven winter cover crops were compared to a fallow control. No significant differences were shown between observations of fungal species and individual treatments at the Horticulture Farm during 1989 and 1990. However, there were treatment differences for observed fungi at the RDC farm on specific dates for both years. Furthermore, no individual treatment(s) during the investigation increased observation rates of specific fungal species. Non-burned debris treatments showed consistently higher populations and diversity of fungi than burn debris plots.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01103706
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  • 9
    Digitale Medien
    Digitale Medien
    Effects ofFusarium solani naphthazarin toxins on the cytology and ultrastructure of rough lemon seedlings (1993)
    Springer
    Mycopathologia 123 (1993), S. 117-126 
    Details
    ISSN: 1573-0832
    Schlagwort(e): Citrus ; Dihydrofusarubin ; Isomarticin ; Phytotoxins Transmission electron microsopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Two naphthazarin phytotoxins (dihydrofusarubin and isomarticin) produced byFusarium solani were used to determine their effects on the cytology of leaves of rough lemon (Citrus jambhiri Lush) seedlings maintained in a dilute solution of the toxins. Dihydrofusarubin alone or in combination with isomarticin (80:20, v/v) caused cell necrosis above the midveins and lateral veins, plasmolysis or collapse of spongy mesophyll cells, collapse of phloem, depletion of starch, swelling of chloroplasts and disruption of cellular organization. At the ultrastructural level, the toxins affected chloroplast membranes by causing swelling, breaks in outer membranes, granal stack disorganization and swelling of intergranal membranes. The interstromal lamellae appeared as vesicles and sometimes as peripheral reticulum, with an increase in plastoglobuli. The tonoplast was broken or vesiculated. The only membranes not affected by the toxins were those of the nucleus and the mitochondria. This study establishes that the initial toxin effects of these fungal phytotoxins are on organellar membranes, primarily those of the chloroplasts, plasmalemma and tonoplast.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01365090
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  • 10
    Digitale Medien
    Digitale Medien
    Acute toxicity tests and pulsed-dose delayed mortality at 12 and 22°C in the zebra mussel (Dreissena polymorpha) (1993)
    Springer
    Archives of environmental contamination and toxicology 24 (1993), S. 389-398 
    Details
    ISSN: 1432-0703
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Notizen: Abstract Three potential chemical controls (sodium hypochlorite, hydrogen peroxide, and poly[oxyethylene (dimethylimino) ethylene (dimethylimino) ethylene dichloride] (commercial trade name BULAB 6002)) were evaluated for acute toxicity to small adult zebra mussels (Dreissena polymorpha) in chronic and pulsed-dose laboratory trials at two temperatures. All three control agents tested effected greater mortality ofD. polymorpha at 22°C than at 12°C. In most cases the mortality level at 12°C was one half or less that incurred at the higher temperature. Analysis of variance showed significant effects of temperature in the case of BULAB 6002 and for hydrogen peroxide; plots of cumulative mortality through time show this trend as well. The relationship between mussel valve length and time-of-death is consistently positive but is significant in few individual treatments, however, when treatments (all concentrations and temperatures) for a single biocide are pooled, the relationship is significant and explains 16–26% of the variance. This suggests that control programs might be more effective if they are initiated whenD. polymorpha are small. Pulsed-dose control programs also are affected by temperature but generally are likely to be more cost-effective than continuous application control programs and would result in lower overall discharge of biocides to surface waters. Hydrogen peroxide at concentrations of 12.0, 20.0, or 30.0 mg/L is a quick acting control agent that probably will have fewer long-term consequences for nontarget organisms in discharge areas or for municipal water users than either BULAB 6002 or, especially, sodium hypochlorite.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01128739
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