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  • 1
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    VLT/NACO infrared adaptive optics images of small scale structures in OMC1 (2004)
    EDP Sciences
    Details
    Publication Date: 2004-03-16
    Print ISSN: 0004-6361
    Electronic ISSN: 1432-0746
    Topics: Physics
    Published by EDP Sciences
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Chocolate at a Sliding Interface (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 67 (2002), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The tribological properties of a chocolate-lubricated tribo-system have been measured with a pin-on-disk tribometer employing poly(tetrafluoroethylene) (PTFE)/zirconia (ZrO2) as the tribo-pair. For this study, a series of test chocolate samples was prepared by systematic variation of conching type, particle-size distribution, milk fat/cocoa butter ratio, and lecithin content. Tribological measurements were found to be sensitive to lecithin content for all particle sizes investigated, while only being sensitive to particle size at high lecithin content. Rheological measurements were found to be sensitive to lecithin content in the case of small particle size, and sensitive to particle size in the case of low lecithin content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2002.tb08803.x
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  • 3
    Electronic Resource
    Electronic Resource
    Construction and physiological studies of hydrogenase depleted mutants of Desulfovibrio fructosovorans (2002)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 214 (2002), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Desulfovibrio fructosovorans possesses two periplasmic hydrogenases (a nickel-iron and an iron hydrogenase) and a cytoplasmic NADP-dependent hydrogenase. The hydAB genes encoding the periplasmic iron hydrogenase were replaced, in the wild-type strain as well as in single mutants depleted of one of the other two hydrogenases, by the acc1 gene encoding resistance to gentamycin. Molecular characterization and remaining activity measurements of the resulting single and double mutants were performed. All mutated strains exhibited similar growth when H2 was the electron donor but they grew differently on fructose, lactate or pyruvate as electron donors. Our results indicate that the loss of one enzyme might be compensated by another even though hydrogenases have different localization in the cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.2002.tb11332.x
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  • 4
    Electronic Resource
    Electronic Resource
    A star in a 15.2-year orbit around the supermassive black hole at the centre of the Milky Way (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 419 (2002), S. 694-696 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Many galaxies are thought to have supermassive black holes at their centres—more than a million times the mass of the Sun. Measurements of stellar velocities and the discovery of variable X-ray emission have provided strong evidence in favour of such a black hole at the centre of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01121
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  • 5
    Electronic Resource
    Electronic Resource
    (Mg,Co)O Solid-Solution Precursors for the Large-Scale Synthesis of Carbon Nanotubes by Catalytic Chemical Vapor Deposition (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Single- and double-walled carbon nanotubes were produced in high yield using the selective reduction of solid solutions of Mg1–xCoxO in a methane and hydrogen atmosphere at 1000°C. The solid solutions were prepared using combustion synthesis with urea as the fuel. The BET surface areas ranged from 10 to 65 m2/g depending on the fuel content. A single crystalline phase was obtained only for fuel-rich compositions. Increased fuel content increased the surface area by a factor of 6. However, very high fuel contents (〉4 times the stoichiometric amount) caused a demixed solid solution. Surface-area measurements and Raman spectra showed that the quantity of nanotubes formed depended on the surface area and composition of the precursor oxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00513.x
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  • 6
    Electronic Resource
    Electronic Resource
    DISCREPANCY BETWEEN THE EXPECTED AND ACTUAL ACCEPTABILITY OF MEAT PRODUCTS, EGGS AND FISH: THE CASE OF OLDER CONSUMERS (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 17 (2002), S. 0 
    Details
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Expected acceptability and actually taste acceptability of meat and other foods were determined in elderly subjects. Subjects gave an acceptability score, followed by a free description of the strong and weak points, first from memory during an interview and then after tasting each food. Taste acceptabilities of lamb, fish, poultry, veal and pork were similar to those expected during the interview. Significant discrepancies between observed and expected acceptability were found for beef, processed pork, eggs and rabbit meat. Beef was described as “ tough” after tasting while it was expected as being “ tender” in the interview; processed pork was associated with “ good quality” and “ good texture” during tasting whereas, “ too fatty” with no strong points were expected in the interview; rabbit was criticized for “ dry texture” more often in the interview than after tasting; eggs were popular for their “ soft texture” and “ good taste” but associated with “ too fatty” and “ bad quality” in the interview. The expected acceptability of processed pork, eggs and rabbit seemed to be governed by negative images of fatness or dryness and that of beef by a positive image of “ tenderness”, which related poorly with tasting experience.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-459X.2002.tb00332.x
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  • 7
    Electronic Resource
    Electronic Resource
    AN EFFECTIVE HEDONIC ANALYSIS TOOL: WEAK/STRONG POINTS (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of sensory studies 16 (2001), S. 0 
    Details
    ISSN: 1745-459X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In 2 separate studies, 6 rice and 6 dry-cured ham samples were tasted by 2 sets of consumers. The consumers were asked about their hedonic evaluation and invited to comment on the weak and strong points of food samples. The frequencies of quoted terms were analyzed by correspondence analysis (CA). A trained panel carried out the sample profiles. Hedonic scores were linked to objective assessment using the preference mapping (PM). Figures from CA and PM showed similar proximity between samples in both studies. The descriptive vocabulary used by trained assessors and consumers contained both similarities and differences. In the rice study, the trained panel described Basmati with the terms ‘little elastic’, ‘long grain’ and ‘brioche flavor’, while consumers used ‘aromatic’, ‘long grain’, ‘white color’ and ‘good texture’. In the dry-cured ham study, Iberian and Corsican samples were described by ‘rancid’, ‘blue cheese’, ‘mushroom’, ‘bitter’ and 'sweet’ attributes while consumers only used ‘too fatty’, ‘bad taste’ and 'strange’ terms. Trained assessors stressed the greatest sensory differences while consumers focused on salient popular and unpopular traits. Weak/strong points analysis was efficient to show the level of acceptability by the number of strong points attributed to the samples and the main reasons for acceptability or rejection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-459X.2001.tb00325.x
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  • 8
    Electronic Resource
    Electronic Resource
    Electrophysiological characterization of tomato hypocotyl putative action potentials induced by cotyledon heating (2002)
    Oxford, UK : Blackwell Science, Ltd
    Physiologia plantarum 115 (2002), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Young tomato plants (Lycopersicon esculentum, 8 days old) were given a heat-wound to a cotyledon. The resulting electrical activity at the hypocotyl level was monitored with intracellular microelectrodes. We observed an original pattern of slow wave potentials (SWPs), consisting of 2–3 slow waves, with associated spikes. The electrophysiological study of the SWPs confirms previous conclusions that the SWPs are due to the inhibition of an active component of the membrane potential. The electrophysiological study of the spikes shows that they fit particularities of putative action potentials (APs). They seem to be triggered by the depolarization accompanying the SWPs and thus can appear late during the SWP. An ionic characterization of the spikes by using different extracellular ionic concentrations and channel blockers suggests that anionic channels might be involved, carrying SO42– ions. The channels activity might be down regulated by the calcium released by the vacuole during the SWPs and APs. A better characterization of the nature of these APs could permit the understanding of the information transmission mechanisms in higher plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.2002.1150204.x
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  • 9
    Electronic Resource
    Electronic Resource
    Translational readthrough of the PDE2 stop codon modulates cAMP levels in Saccharomyces cerevisiae (2002)
    Oxford, UK : Blackwell Science Ltd.
    Molecular microbiology 43 (2002), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The efficiency of translation termination in yeast can vary several 100-fold, depending on the context around the stop codon. We performed a computer analysis designed to identify yeast open reading frames (ORFs) containing a readthrough motif surrounding the termination codon. Eight ORFs were found to display inefficient stop codon recognition, one of which, PDE2, encodes the high-affinity cAMP phosphodiesterase. We demonstrate that Pde2p stability is very impaired by the readthrough-dependent extension of the protein. A 20-fold increase in readthrough of PDE2 was observed in a [PSI+] as compared with a [psi–] strain. Consistent with this observation, an important increase in cAMP concentration was observed in suppressor backgrounds. These results provide a molecular explanation for at least some of the secondary phenotypes associated with suppressor backgrounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2002.02770.x
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  • 10
    Electronic Resource
    Electronic Resource
    Comparisons of recombination frequencies in hybrids involving telocentric and bibrachial wheat chromosomes (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 308-314 
    Details
    ISSN: 1432-2242
    Keywords: Key words Triticum aestivum ; Recombination ; Centromeric region ; Telosomes ; Gametic selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Telosomic stocks have been extensively used to map genes to chromosome arms and to determine gene-to-centromere genetic distances. It has been suggested that if a chromosome arm is present as a telosome, recombination frequencies will be drastically reduced in the centromeric region. However, previous studies have not considered the bias in recombination estimates due to selection against aneuploid gametes produced by failure of pairing at the first meiotic division. Formulas are derived here for adjusting recombination estimates for this bias. Adjusted recombination frequencies between markers located on both sides of the centromeres are analyzed in three different pairs of wheat (Triticum aestivum) isogenic segregating populations involving bibrachial and telocentric chromosomes. Recombination frequencies estimated from crosses involving telocentric chromosomes were not significantly different from recombination frequencies estimated from isogenic crosses involving bibrachial chromosomes. The implications of the present findings for karyotype evolution, and specifically for Robertsonian fissions and fusions, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050040
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