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  • Springer  (48)
  • Wiley  (13)
  • Blackwell Science Ltd
  • 1
    Electronic Resource
    Electronic Resource
    Gene expression profiling and protection of Medicago truncatula against a fungal infection in response to an elicitor from green algae Ulva spp (2004)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 27 (2004), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Elicitors are molecules known to trigger plant defence responses against pathogens. In a search for new sources of eliciting compounds from marine algae, an extract was prepared from green algae, Ulva spp., and its elicitor activity was established on the model legume, Medicago truncatula. When infiltrated into plant tissues or sprayed onto the leaves, this extract induced the expression of the defence-related marker gene PR10 without provoking necrosis. Spraying a solution at 500 µg mL−1 was sufficient to obtain maximum induction of PR10 after 2 d. Using a cDNA array enriched in genes potentially involved in plant defence, the expression of 152 genes was monitored after one or two consecutive treatments. A broad range of defence-related transcripts was found to be up-regulated, notably genes involved in the biosynthesis of phytoalexins, pathogenesis-related proteins and cell wall proteins. In contrast, the expression of primary metabolism-related genes did not change significantly. Consistent with its effect on defence gene expression, it was found that prior treatment of M. truncatula with the Ulva extract protected the plants against subsequent infection by the pathogenic fungus Colletotrichum trifolii.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.2004.01197.x
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen evolution reaction on electrocatalytic materials highly dispersed on carbon powder (1995)
    Springer
    Journal of applied electrochemistry 25 (1995), S. 923-932 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Highly dispersed electrocatalytic materials were obtained by vacuum deposition of catalytic metals on electromechanically suspended graphite powder particles. Graphite electrodes, vacuum-deposited with various metals (Ni, Pt, Au, Pd, Rh) or an alloy (Cu-Al), were bonded with an inorganic polymer, LaPO4. A.c. impedance and steady-state polarization methods were used to investigate the mechanism and kinetics of the hydrogen evolution reaction (HER) in 1m KOH at 25°C for Pt/C, Pd/C and Rh/C electrodes. It was concluded that the HER follows a Volmer-Heyrovsky mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241586
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  • 3
    Electronic Resource
    Electronic Resource
    N-body study of anisotropic membrane inclusions: Membrane mediated interactions and ordered aggregation (1999)
    Springer
    The European physical journal 12 (1999), S. 9-12 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 87.15.Kg Molecular interactions; membrane-protein interactions - 64.60.Cn Order-disorder transformations; statistical mechanics of model systems - 24.10.Cn Many-body theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the collective behavior of inclusions inducing local anisotropic curvatures in a flexible fluid membrane. The N-body interaction energy for general anisotropic inclusions is calculated explicitly, including multi-body interactions. Long-range attractive interactions between inclusions are found to be sufficiently strong to induce aggregation. Monte Carlo simulations show a transition from compact clusters to aggregation on lines or circles. These results might be relevant to proteins in biological membranes or colloidal particles bound to surfactant membranes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050968
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  • 4
    Electronic Resource
    Electronic Resource
    Predatory feeding behavior of the marine cyclopoid copepod Corycaeus anglicus (1985)
    Springer
    Marine biology 85 (1985), S. 163-169 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Feeding rates, patterns of prey selection, and starvation tolerance were investigated for adult males and females of the cyclopoid copepod Corycaeus anglicus collected from the waters of Friday Harbor, Washington, USA. Selection by C. anglicus was determined largely by prey body-size, but was also affected by species and developmental stage. Small developmental stages of all prey species were fed upon at relatively low rates. The small calanoid species Acartia clausii was increasingly vulnerable to predation by C. anglicus as it progressed through successive developmental stages. Larger prey species, Pseudocalanus sp. and Calanus pacificus, were more vulnerable in intermediate stages, the C3 and N6 stages, respectively. Larger and smaller prey were characteristically attacked at different sites on their bodies; however, attack sites fell within a similar range of body widths, 130 to 170 μm. Males of Corycaeus anglicus killed a maximum of 1.4 prey d-1 when feeding on the optimally-sized adult females of Acartia clausii, which are approximately equivalent to its own body length. Males fed at approximately double the rates of females. Despite its small size and apparent lack of metabolic stores, this cyclopoid is highly tolerant of starvation conditions. Median survival time without food is at least 2 wk for both males and females. In its predatory behavior, C. anglicus employs an ambush-type strategy and seems to be adapted for infrequent encounters with relatively large prey.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397435
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  • 5
    Electronic Resource
    Electronic Resource
    Real-time recognition of microscopic phase objects (1978)
    Springer
    Applied physics 17 (1978), S. 287-293 
    Details
    ISSN: 1432-0630
    Keywords: 42.30 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A method of image enhancement and real-time input of 3-D, microscopic phase objects into a coherent optical pattern recognition system is described. The method consists of directing a low-power laser beam into a microscope objective to produce a real, magnified, coherent image of the specimen under test. The image plane is followed by two successive Fourier transform (FT) planes. In the first FT plane, low and high frequency spatial filters, one of which is photographically produced, are used as pre-processing filters to enhance the image quality. The enhanced signal is imaged from the first FT plane to the second FT plane which contains a matched spatial filter used for specimen identification. The system does not require an expensive incoherent-to-coherent light transducer and in addition, is capable of utilizing both phase and amplitude information from 3-D objects. Examples of results are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886957
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  • 6
    Electronic Resource
    Electronic Resource
    Effective anchoring and scaling in nematic liquid crystals (2000)
    Springer
    The European physical journal 2 (2000), S. 59-65 
    Details
    ISSN: 1292-895X
    Keywords: PACS. 61.30.-v Liquid crystals – 68.10.Cr Surface energy (surface tension, interface tension, angle of contact, etc.) – 68.45.-v Solid-fluid interfaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study, by coarse-graining methods, the dependence of the nematic anchoring energy on the scale at which the orientation of the nematic director is resolved. We obtain a relationship allowing to compare anchoring measurements with different resolutions performed on the same nematic-substrate system. Our theory also permits to calculate the effective macroscopic anchoring corresponding to a given micro-fabricated surface aligning pattern, and to determine the limitations of this effective description.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101890050040
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  • 7
    Electronic Resource
    Electronic Resource
    Surface characterization of natural graphite powder composite electrodes by atomic force microscopy (1996)
    Springer
    Journal of materials science 31 (1996), S. 513-518 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Graphite powder electrodes bonded by polymerized LaPO4 have been investigated for the first time by atomic force microscopy (AFM). The interest in investigating this material stems from the fact that graphite electrodes intercalated, or not, with various metals and bonded with LaPO4 have shown very good mechanical and electrochemical stability during the hydrogen evolution reaction (HER) in 1 M KOH aqueous solutions. Examination of their surfaces by scanning electron microscopy has revealed that these electrodes are very porous. AFM furnishes additional data about the surface and can therefore be considered a powerful tool for surface characterization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01139172
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  • 8
    Electronic Resource
    Electronic Resource
    Distribution and submicroscopic immunogold localization of cellular prion protein (PrPc) in extracerebral tissues (1998)
    Springer
    Cell & tissue research 292 (1998), S. 77-84 
    Details
    ISSN: 1432-0878
    Keywords: Key words Prion protein (PrPc) ; Electron microscopy ; Secretory granules ; Membrane ; Extracerebral tissues ; Hamster ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  In transmissible spongiform encephalopathies (TSE), such as scrapie in animals and Creutzfeldt-Jakob disease in humans, the central event is the conversion of a host-encoded amyloidogenic protein (PrPc) into an abnormal isoform (PrPsc) that accumulates as amyloid in TSE brain. PrPc is a membrane sialoglycoprotein synthesized in the central nervous system and elsewhere. We have examined the ultrastructural localization of PrPc in numerous hamster and some human extracerebral tissues, by means of a post-embedding electron-microscopic method combined with immunogold labeling. In stomach, intestine, lung, and kidney from hamsters, and in stomach, kidney, and spleen from humans, immunogold labeling specific for PrPc is observed on various cellular substructures related to secretory pathways: Golgi apparatus, secretory globules, and plasma membrane. In mucous epithelial cells of stomach and intestine, PrPc appears to be concentrated in secretory globules, suggesting a role for PrPc in the secretory function of the digestive tract. The secretory aspect of PrPc may be a key to understanding the physiopathological mechanisms underlying TSE.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410051036
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  • 9
    Electronic Resource
    Electronic Resource
    Hardy and Paley Inequalities for Fully-Odd Vilenkin Systems (1997)
    Springer
    Acta mathematica hungarica 75 (1997), S. 89-103 
    Details
    ISSN: 1588-2632
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006534802172
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  • 10
    Electronic Resource
    Electronic Resource
    Capillary gas chromatographic — Mass spectrometric determination of iprodione in chicory and leek (1995)
    Springer
    Chromatographia 41 (1995), S. 693-696 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography—mass spectrometry ; Iprodione residues ; Chicory ; Leeks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A capillary GC/MS method is presented for the analysis of iprodione (CAS registry number 36734-19-7) in chicory and in leek. Preliminary extraction was carried out using methanol, and the extracts were cleaned up using two liquid-liquid extractions and Bakerbond SPE Florisil® cartridges. The eluates were evaporated to dryness under reduced pressure, and the residues dissolved in hexane. Iprodione was then monitored by capillary Gas Chromatography, with Mass Spectrometric Detection, in the selective ion mode at m/z 314. Recoveries of 89% to 108% were obtained for chicory and leek fortified at 100 and 500 μg kg−1. The proposed method of analysis has a detection limit of 2 μg kg−1 for chicory and 4 μg kg−1 for leek.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267806
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