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  • 1
    Electronic Resource
    Electronic Resource
    Enzymic modification of the extractability of nitrogenous constituents from pea beans (1970)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 18 (1970), S. 1083-1085 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60172a005
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  • 2
    Electronic Resource
    Electronic Resource
    Fate of cadmium and mutagens in municipal sludge-grown sugar beets and field corn during fermentation (1983)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 31 (1983), S. 496-499 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00117a008
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  • 3
    Electronic Resource
    Electronic Resource
    Dispersed fluorescence of jet-cooled tryptophan: Excited state conformers and intramolecular exciplex formation (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 6945-6951 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dispersed fluorescence of the amino acid tryptophan has been measured in the environment of a cold, supersonic free jet. Analysis of the region of the spectrum near the electronic origin indicates that the electronic excitation spectrum contains features which arise from various ground state conformers of tryptophan, confirming our previous assignment of these features. Under the conditions of our experiment the conformers do not interconvert in the excited state during the fluorescence liftime. Analysis of the dispersed emission spectrum of one conformer reveals broad red-shifted fluorescence which exists even when the electronic origin transition is excited. This broad red-shifted fluorescence is produced by the formation of an intramolecular exciplex involving excited state proton transfer to form a zwitterion. Molecules which do not have the ability to form a zwitterion do not exhibit this behavior, and deuterated trytophan shows broad fluorescence in an amount consistent with a slower proton transfer rate. The significance of these results for understanding the excited state photophysics of tryptophan in solution is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451381
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  • 4
    Electronic Resource
    Electronic Resource
    Management and Utilization of Food Processing Wastes (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 69 (2004), 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: : Large quantities of both liquid and solid wastes are produced annually by the food processing industry. These waste materials contain principally biodegradable organic matter and disposal of them creates serious environmental problems. Factors affecting the costs of waste disposal are the volume or hydraulic load and the strength or organic load. The waste loads at the processing plant can be reduced significantly through the use of new or modified processing methods and through in-plant treatment and re-use. A number of waste treatment processes are available to make the wastewater suitable for discharge. The most widely applied processes are biological treatment, impounding in storage lagoons, and land irrigation. Most solid wastes are disposed of by returning them to the land. The key to minimizing the disposal cost is to remove excessive moisture from the wastes. Many opportunities exist for better utilization of food processing wastes. A variety of processes have been developed for converting the waste materials into bio-fuels, food ingredients, and other valuable bio-products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2004.tb13341.x
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  • 5
    Electronic Resource
    Electronic Resource
    Isolation and characterization of Pichia stipitis mutants with enhanced xylanase activity (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 545-550 
    Details
    ISSN: 1573-0972
    Keywords: Characterization ; isolation ; mutation ; Pichia stipitis ; xylan ; xylanase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Pichia stipitis strain NRRL Y-11,543 was mutagenized with N-methyl-N′-nitro-N-nitrosoguanidine (NTG) to improve xylanolytic activity. A total of 20,000 mutants were screened for xylanase overproduction by observing the clear zones around the colonies on remazol-briliant-blue-xylan (RBB-xylan)-containing agar. Of 94 mutants isolated 11 of them were found to have enhanced xylanase activity compared to the parental strain. The most active mutant NP54376 had superior properties to the wild type which included: double the enzyme activity of wild type, a shorter generation time of 2.22 h compared to 3.13 h when grown on xylan, and an enhanced growth and yield of xylanase when low levels of xylose were added to the medium. Zymogram analysis of the crude enzyme preparations from both NP54376 and the wild type by isoelectric focusing showed multiple bands ranging between pI 4.2 and 7.4. No significant difference was observed in the K m and V max values of the parental strain and NP54376. K m and V max values of xylanase for birchwood xylan were 4.2 mg ml−1 and 0.08 μmol min−1 mg−1 of protein, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008987015847
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  • 6
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    ARGOS - IV. The kinematics of the Milky Way bulge (2013)
    Oxford University Press
    Details
    Publication Date: 2013-06-09
    Description: We present the kinematic results from our ARGOS spectroscopic survey of the Galactic bulge of the Milky Way. Our aim is to understand the formation of the Galactic bulge. We examine the kinematics of about 17 400 stars in the bulge located within 3.5 kpc of the Galactic Centre, identified from the 28 000 star ARGOS survey. We aim to determine if the formation of the bulge has been internally driven from disc instabilities as suggested by its boxy shape, or if mergers have played a significant role as expected from lambda cold dark matter simulations. From our velocity measurements across latitudes b  = –5°, – 7 ${^{\circ}_{.}}$ 5 and –10° we find the bulge to be a cylindrically rotating system that transitions smoothly out into the disc. From observations of 3 fields at b  = +10, the kinematics of the bulge show North-South symmetry about the major axis. Within the bulge, we find a kinematically distinct metal-poor population ([Fe/H] 〈 –1.0) that is not rotating cylindrically. The 5 per cent of our stars with [Fe/H] 〈 –1.0 are a slowly rotating spheroidal population, which we believe are stars of the metal-weak thick disc and halo which presently lie in the inner Galaxy. The kinematics of the two bulge components that we identified in ARGOS Paper III (mean [Fe/H]  –0.25 and [Fe/H]  +0.15, respectively) demonstrate that they are likely to share a common formation origin and are distinct from the more metal-poor populations of the thick disc and halo which are co-located inside the bulge. We do not exclude an underlying merger generated bulge component but our results favour bulge formation from instabilities in the early thin disc.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 7
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    The detailed chemical composition of the terrestrial planet host Kepler-10 (2016)
    Oxford University Press
    Details
    Publication Date: 2016-01-02
    Description: Chemical abundance studies of the Sun and solar twins have demonstrated that the solar composition of refractory elements is depleted when compared to volatile elements, which could be due to the formation of terrestrial planets. In order to further examine this scenario, we conducted a line-by-line differential chemical abundance analysis of the terrestrial planet host Kepler-10 and 14 of its stellar twins. Stellar parameters and elemental abundances of Kepler-10 and its stellar twins were obtained with very high precision using a strictly differential analysis of high quality Canada–France–Hawaii Telescope, Hobby–Eberly Telescope and Magellan spectra. When compared to the majority of thick disc twins, Kepler-10 shows a depletion in the refractory elements relative to the volatile elements, which could be due to the formation of terrestrial planets in the Kepler-10 system. The average abundance pattern corresponds to ~13 Earth masses, while the two known planets in Kepler-10 system have a combined ~20 Earth masses. For two of the eight thick disc twins, however, no depletion patterns are found. Although our results demonstrate that several factors [e.g. planet signature, stellar age, stellar birth location and Galactic chemical evolution (GCE)] could lead to or affect abundance trends with condensation temperature, we find that the trends give further support for the planetary signature hypothesis.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 8
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    Fate of cadmium and mutagens in municipal sludge-grown sugar beets and field corn during fermentation (1983)
    American Chemical Society
    Details
    Publication Date: 1983-05-01
    Print ISSN: 0021-8561
    Electronic ISSN: 1520-5118
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Published by American Chemical Society
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  • 9
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    Confirming the intrinsic abundance spread in the globular cluster NGC 6273 (M19) with calcium triplet spectroscopy (2016)
    Oxford University Press
    Details
    Publication Date: 2016-06-09
    Description: We present metallicities for red giant stars in the globular cluster NGC 6273 based on intermediate resolution GMOS-S spectra of the calcium triplet region. For the 42 radial velocity members with reliable calcium triplet line strength measurements, we obtain metallicities, [Fe/H], using calibrations established from standard globular clusters. We confirm the presence of an intrinsic abundance dispersion identified by Johnson et al. The total range in [Fe/H] is ~1.0 dex and after taking into account the measurement errors, the intrinsic abundance dispersion is int [Fe/H] = 0.17 dex. Among the Galactic globular clusters, the abundance dispersion in NGC 6273 is only exceeded by Cen, which is regarded as the remnant of a disrupted dwarf galaxy, and M54, which is the nuclear star cluster of the Sagittarius dwarf galaxy. If these three globular clusters share the same formation mechanism, then NGC 6273 may also be the remnant nucleus of a disrupted dwarf galaxy.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 10
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    The EMBLA survey - metal-poor stars in the Galactic bulge (2016)
    Oxford University Press
    Details
    Publication Date: 2016-06-01
    Description: Cosmological models predict the oldest stars in the Galaxy should be found closest to the centre of the potential well, in the bulge. The Extremely Metal-poor BuLge stars with AAOmega survey (EMBLA) successfully searched for these old, metal-poor stars by making use of the distinctive SkyMapper photometric filters to discover candidate metal-poor stars in the bulge. Their metal-poor nature was then confirmed using the AAOmega spectrograph on the Anglo-Australian Telescope. Here we present an abundance analysis of 10 bulge stars with –2.8 〈 [Fe/H] 〈 –1.7 from MIKE/Magellan observations, in total determining the abundances of 22 elements. Combining these results with our previous high-resolution data taken as part of the Gaia -ESO Survey, we have started to put together a picture of the chemical and kinematic nature of the most metal-poor stars in the bulge. The currently available kinematic data are consistent with the stars belonging to the bulge, although more accurate measurements are needed to constrain the stars’ orbits. The chemistry of these bulge stars deviates from that found in halo stars of the same metallicity. Two notable differences are the absence of carbon-enhanced metal-poor bulge stars, and the α element abundances exhibit a large intrinsic scatter and include stars which are underabundant in these typically enhanced elements.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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