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  • 1
    Electronic Resource
    Electronic Resource
    Repression of galactose utilization by glucose in the citrate-producing yeastCandida guilliermondii (1993)
    Springer
    Journal of industrial microbiology and biotechnology 11 (1993), S. 143-146 
    Details
    ISSN: 1476-5535
    Keywords: Citric acid production ; Candida guiliermondii ; Galactose ; Glucose ; Catabolite repression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A strain of the yeastCandida guilliermondii has been shown to produce citric acid from galactose to a similar extent, and at a similar rate, as from glucose. At an initial concentration of 36 g/l of either glucose or galactose, citric acid production exceeds 13 g/l. When galactose and glucose are present in a mixture, however, galactose utilization is delayed until most of the glucose has been utilized, providing evidence for catabolite repression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01583714
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  • 2
    Electronic Resource
    Electronic Resource
    Normal p21 N-ras couples bombesin and other growth factor receptors to inositol phosphate production (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 173-176 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Around 10-20% of human tumour DNA samples have been shown to contain an oncogene detectable in the NIH 3T3 DNA transfection assay14"16. In almost all of these cases the oncogene is a member of the ras gene family17'19. There are three functional ras genes in the-human genome, c-Ha-ras-1, c-Ki-ras-2 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/323173a0
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  • 3
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    A Field Method for Investigating the Cultural Landscape (1989)
    Macomb, Ill., etc. : Periodicals Archive Online (PAO)
    Journal of Geography. 88:3 (1989:May/June) 95 
    Details
    ISSN: 0022-1341
    Topics: Geography
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1129-1989-088-03-000003
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  • 4
    Electronic Resource
    Electronic Resource
    High specific rates of glucose utilisation under conditions of restricted growth are required for citric acid accumulation by Yarrowia lipolytica IMK 2 (1994)
    Springer
    Applied microbiology and biotechnology 41 (1994), S. 73-78 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract. Yarrowia lipolytica strain IMK 2, a yeast capable of producing and excreting citric acid, only accumulated citric acid when cell growth was restricted by specific nutrient limitations. Effective citrate accumulation was linked with the ability of cells to maintain a high rate of glucose utilisation when growth was limited. Cells limited by nitrogen (N), sulphur (S), magnesium (Mg) or phosphorus (P) accumulated between 50 and 220 mm citric acid after 168 h, with N and S limitation resulting in the highest specific rates of production. In contrast, potassium (K)-limited cells accumulated 6 mm citric acid in the same time period. Cells limited by K or lower levels of Mg or P had rates of glucose utilisation that were less than 50% of those measured in cells limited by N or S. Although limitation of strain IMK 2 by Mg or P led to citrate production, significant accumulation occurred only when the threshold concentration of the limiting nutrient was exceeded. There was no large accumulation of other tricarboxylic acid (TCA) cycle acids, acetate, pyruvate, lactate or ethanol, although K-limited cells produced quantities of intracellular glycogen. Mannitol was accumulated under N, S and P limitation (up to 40 mm), as were small quantities of 2-oxoglutarate, which preceded the accumulation of citrate and all of the other TCA cycle acids measured. A clear difference was evident between the rates of glucose utilisation under N limitation between two citrate-accumulating strains (IMK 2 and Candida guilliermondii IMK 1) and a citrate non-accumulating strain, Y. lipolytica YB 423. Although these strains had similar rates of glucose utilisation during exponential growth, both strains IMK 1 and IMK 2 had specific rates of glucose utilisation under N limitation more than double that of strain YB 423.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166084
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  • 5
    Electronic Resource
    Electronic Resource
    High specific rates of glucose utilisation under conditions of restricted growth are required for citric acid accumulation by Yarrowia lipolytica IMK 2 (1994)
    Springer
    Applied microbiology and biotechnology 41 (1994), S. 73-78 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Yarrowia lipolytica strain IMK 2, a yeast capable of producing and excreting citric acid, only accumulated citric acid when cell growth was restricted by specific nutrient limitations. Effective citrate accumulation was linked with the ability of cells to maintain a high rate of glucose utilisation when growth was limited. Cells limited by nitrogen (N), sulphur (S), magnesium (Mg) or phosphorus (P) accumulated between 50 and 220 mm citric acid after 168 h, with N and S limitation resulting in the highest specific rates of production. In contrast, potassium (K)-limited cells accumulated 6 mm citric acid in the same time period. Cells limited by K or lower levels of Mg or P had rates of glucose utilisation that were less than 50% of those measured in cells limited by N or S. Although limitation of strain IMK 2 by Mg or P led to citrate production, significant accumulation occured only when the threshold concentration of the limiting nutrient was exceeded. There was no large accumulation of other tricarboxylic acid (TCA) cycle acids, acetate, pyruvate, lactate or ethanol, although K-limited cells produced quantities of intracellular glycogen. Mannitol was accumulated under N, S and P limitation (up to 40 mm), as were small quantities of 2-oxoglutarate, which preceded the accumulation of citrate and all of the other TCA cycle acids measured. A clear difference was evident between the rates of glucose utilisation under N limitation between two citrate-accumulating strains (IMK 2 and Candida guilliermondii IMK 1) and a citrate non-accumulating strain, Y. lipolytica YB 423. Although these strains had similar rates of glucose utilisation during exponential growth, both strains IMK 1 and IMK 2 had specific rates of glucose utilisation under N limitation more than double that of strain YB 423.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166084
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  • 6
    Electronic Resource
    Electronic Resource
    Polystyrene/Polycarbonate/Polystyrene-block-Polycaprolactone blends. Emulsification and mechanical performance (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 281-295 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Two polystyrene-polycaprolactone diblock copolymers, of differing molecular weights, have been extrusion-blended with polystyrene and polycarbonate. The morphologies of the resultant blends were studied using differential scanning calorimetry and scanning electron microscopy. In all compositions studied, the polystyrene and polycarbonate phases exhibited discrete glass transitions indicative of the immiscibility of these components. However, addition of the copolymer increased the extent of dispersion of the homopolymer components within one another quite effectively. Blend specimens were tested with respect to tensile, flexural, impact, thermal, and flow characteristics to probe the effects of morphology and composition on these factors. In general, the blends were rigid, brittle materials with thermal characteristics in the range between those of the polystyrene and polycarbonate components. Addition of polystyrene-block-polycaprolactone polymer to the blends resulted in increased brittleness, reduced thermal performance, maintenance of rigidity, and improved flow.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420201
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  • 7
    Electronic Resource
    Electronic Resource
    Polystyrene/polyethylene terephthalate/polystyrene-block-polycaprolactone blends: Emulsification and mechanical performance (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 1593-1603 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A polystyrene-polycaprolactone diblock copolymer was extrusion blended with polystyrene and polyethylene terephthalate. The morphologies of the resultant blends were studied using differential scanning calorimetry and scanning electron microscopy. In all compositions studied, the polystyrene and polyethylene terephthalate phases exhibited discrete glass transitions indicative of the immiscibility of these components. However, addition of the copolymer increased the extent of dispersion of the homopolymer components within one another quite effectively. Blend specimens were tested with respect to tensile, flexural, impact, and thermal performance characteristics to study the effects of morphology and composition on these factors. In general, the blends were rigid, brittle materials with some-what enhanced thermal characteristics. Addition of polystyrene-block-polycaprolactone polymer to the blends resulted in increased brittleness, slightly reduced thermal performance, and, in some instances, greatly increased rigidity.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070430902
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  • 8
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    Engineering titania nanostructure to tune and improve its photocatalytic activity (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-03-28
    Description: Photocatalytic pathways could prove crucial to the sustainable production of fuels and chemicals required for a carbon-neutral society. Electron−hole recombination is a critical problem that has, so far, limited the efficiency of the most promising photocatalytic materials. Here, we show the efficacy of anisotropy in improving charge separation and thereby boosting the activity of a titania (TiO2) photocatalytic system. Specifically, we show that H2 production in uniform, one-dimensional brookite titania nanorods is highly enhanced by engineering their length. By using complimentary characterization techniques to separately probe excited electrons and holes, we link the high observed reaction rates to the anisotropic structure, which favors efficient carrier utilization. Quantum yield values for hydrogen production from ethanol, glycerol, and glucose as high as 65%, 35%, and 6%, respectively, demonstrate the promise and generality of this approach for improving the photoactivity of semiconducting nanostructures for a wide range of reacting systems.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 9
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    IONONEST – A Bayesian approach to modelling the lower ionosphere (2016)
    Wiley
    Details
    Publication Date: 2016-07-22
    Description: Obtaining high resolution electron density height profiles for the D region of the ionosphere as a well sampled function of time is difficult for most methods of ionospheric measurement. Here we present a new method of using multi-frequency riometry data for producing D region height profiles via inverse methods. To obtain these profiles we use the nested sampling technique, implemented through our code, IONONEST. We demonstrate this approach using new data from the KAIRA instrument and consider two electron density models. We compare the recovered height profiles from the KAIRA data with those from incoherent scatter radar using data from the EISCAT instrument and find that there is good agreement between the two techniques, allowing for instrumental differences.
    Print ISSN: 0048-6604
    Electronic ISSN: 1944-799X
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    Dimensionality effects of carbon-based thermal additives for microporous adsorbents (2015)
    Elsevier
    Details
    Publication Date: 2015-11-01
    Print ISSN: 0264-1275
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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