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  • 2015-2019  (20)
  • 2010-2014  (17)
  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Bestimmung von Diacetyl in Apfelwein (1971)
    Springer
    European food research and technology 146 (1971), S. 143-147 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Es wird eine rasche und exakte Bestimmungsmethode für Diacetyl in Apfelwein mittels Gaschromatographie der Head-Space-Phase beschrieben.
    Notes: Summary A rapid and exact method is described for determination of diacetyl in cider by means of head space gas chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01882240
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Gaschromatographische Bestimmung der höheren Ester in Weindestillat, Weinbrand, Brennwein und Wein (1971)
    Springer
    European food research and technology 147 (1971), S. 207-213 
    Details
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Es konnte der Nachweis erbracht werden, daß der CS2-Extrakt zur gas chromatographischen Bestimmung der höheren Ester geeigneter ist als der Ätherextrakt. Dies bezieht sich einerseits auf den Aufwand an Material, Arbeit und Zeit, andererseits auf die Genauigkeit und Reproduzierbarkeit, insbesondere hinsichtlich Äthylcapronat. Eine geeignete Methode zur Untersuchung von Weinbrand, Weindestillat, Brennwein und Wein auf ihren Gehalt an höheren Estern wird angegeben.
    Notes: Summary The CS2-extraction for the gas chromatographic analysis of the higher esters was examined and found to be superior to the ether-extraction, concerning, material, performance as well as accuracy and reproductivity, especially ethyl capronate. The exact method for the analysis of brandy, distillate and wine for their content of higher esters is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01877165
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Transatlantic distribution of the Alaskan White River Ash (2014)
    GSA, Geological Society of America
    In:  Geology, 42 (10). pp. 875-878.
    Details
    Publication Date: 2017-05-17
    Description: Volcanic ash layers preserved within the geologic record represent precise time markers that correlate disparate depositional environments and enable the investigation of synchronous and/or asynchronous behaviors in Earth system and archaeological sciences. However, it is generally assumed that only exceptionally powerful events, such as supereruptions (≥450 km3 of ejecta as dense-rock equivalent; recurrence interval of ∼105 yr), distribute ash broadly enough to have an impact on human society, or allow us to address geologic, climatic, and cultural questions on an intercontinental scale. Here we use geochemical, age, and morphological evidence to show that the Alaskan White River Ash (eastern lobe; A.D. 833–850) correlates to the “AD860B” ash (A.D. 846–848) found in Greenland and northern Europe. These occurrences represent the distribution of an ash over 7000 km, linking marine, terrestrial, and ice-core records. Our results indicate that tephra from more moderate-size eruptions, with recurrence intervals of ∼100 yr, can have substantially greater distributions than previously thought, with direct implications for volcanic dispersal studies, correlation of widely distributed proxy records, and volcanic hazard assessment.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1130/G35945.1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Patterns of widespread decline in North American bumble bees [Ecology] (2011)
    National Academy of Sciences
    Details
    Publication Date: 2011-01-12
    Description: Bumble bees (Bombus) are vitally important pollinators of wild plants and agricultural crops worldwide. Fragmentary observations, however, have suggested population declines in several North American species. Despite rising concern over these observations in the United States, highlighted in a recent National Academy of Sciences report, a national assessment of the geographic scope and possible causal factors of bumble bee decline is lacking. Here, we report results of a 3-y interdisciplinary study of changing distributions, population genetic structure, and levels of pathogen infection in bumble bee populations across the United States. We compare current and historical distributions of eight species, compiling a database of 〉73,000 museum records for comparison with data from intensive nationwide surveys of 〉16,000 specimens. We show that the relative abundances of four species have declined by up to 96% and that their surveyed geographic ranges have contracted by 23–87%, some within the last 20 y. We also show that declining populations have significantly higher infection levels of the microsporidian pathogen Nosema bombi and lower genetic diversity compared with co-occurring populations of the stable (nondeclining) species. Higher pathogen prevalence and reduced genetic diversity are, thus, realistic predictors of these alarming patterns of decline in North America, although cause and effect remain uncertain.
    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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  • 5
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    Contrasting physiological responses of two co-occurring eucalypts to seasonal drought at restored bauxite mine sites (2011)
    Oxford University Press
    Details
    Publication Date: 2011-11-24
    Description: This study describes the physiological response of two co-occurring tree species ( Eucalyptus marginata and Corymbia ­calophylla ) to seasonal drought at low- and high-quality restored bauxite mine sites in south-western Australia. Seasonal changes in photosynthesis ( A ), stomatal conductance ( g s ), leaf water potential (), leaf osmotic potential (), leaf relative water content (RWC) and pressure–volume analysis were captured over an 18-month field study to (i) determine the nature and severity of physiological stress in relation to site quality and (ii) identify any physiological differences between the two species. Root system restriction at the low-quality site reduced maximum rates of gas exchange ( g s and A ) and increased water stress ­(midday and daily RWC) in both species during drought. Both species showed high stomatal sensitivity ­during drought; however, E. marginata demonstrated a higher dehydration tolerance where and RWC fell to –3.2 MPa and 73% compared with –2.4 MPa and 80% for C. calophylla. Corymbia calophylla showed lower g s and higher and RWC during drought, indicating higher drought tolerance. Pressure–volume curves showed that cell-wall elasticity of E. marginata leaves increased in response to drought, while C. calophylla leaves showed lower osmotic potential at zero turgor in summer than in winter, indicating osmotic adjustment. Both species are clearly able to tolerate seasonal drought at hostile sites; however, by C. ­calophylla closing stomata earlier in the drought cycle, maintaining a higher water status during drought and having the additional mechanism of osmotic adjustment, it may have a greater capacity to survive extended periods of drought.
    Print ISSN: 0829-318X
    Electronic ISSN: 1758-4469
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Oxford University Press
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  • 6
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    Excitonic transitions in highly efficient (GaIn)As/Ga(AsSb) type-II quantum-well structures (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-11-04
    Description: The excitonic transitions of the type-II (GaIn)As/Ga(AsSb) gain medium of a “W”-laser structure are characterized experimentally by modulation spectroscopy and analyzed using microscopic quantum theory. On the basis of the very good agreement between the measured and calculated photoreflectivity, the type-I or type-II character of the observable excitonic transitions is identified. Whereas the energetically lowest three transitions exhibit type-II character, the subsequent energetically higher transitions possess type-I character with much stronger dipole moments. Despite the type-II character, the quantum-well structure exhibits a bright luminescence.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 7
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    Transatlantic distribution of the Alaskan White River Ash (2014)
    Geological Society of America (GSA)
    In: Geology
    Details
    Publication Date: 2014-09-20
    Description: Volcanic ash layers preserved within the geologic record represent precise time markers that correlate disparate depositional environments and enable the investigation of synchronous and/or asynchronous behaviors in Earth system and archaeological sciences. However, it is generally assumed that only exceptionally powerful events, such as supereruptions (≥450 km 3 of ejecta as dense-rock equivalent; recurrence interval of ~10 5 yr), distribute ash broadly enough to have an impact on human society, or allow us to address geologic, climatic, and cultural questions on an intercontinental scale. Here we use geochemical, age, and morphological evidence to show that the Alaskan White River Ash (eastern lobe; A.D. 833–850) correlates to the "AD860B" ash (A.D. 846–848) found in Greenland and northern Europe. These occurrences represent the distribution of an ash over 7000 km, linking marine, terrestrial, and ice-core records. Our results indicate that tephra from more moderate-size eruptions, with recurrence intervals of ~100 yr, can have substantially greater distributions than previously thought, with direct implications for volcanic dispersal studies, correlation of widely distributed proxy records, and volcanic hazard assessment.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 8
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    Nonequilibrium transport through molecular junctions in the quantum regime (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-09-21
    Description: Author(s): T. Koch, J. Loos, A. Alvermann, and H. Fehske We consider a quantum dot, affected by a local vibrational mode and contacted to macroscopic leads, in the nonequilibrium steady-state regime. We apply a variational Lang-Firsov transformation and solve the equations of motion of the Green functions in the Kadanoff-Baym formalism up to a second orde... [Phys. Rev. B 84, 125131] Published Tue Sep 20, 2011
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Effect of completion-time windows in the analysis of health-related quality of life outcomes in cancer patients (2012)
    Oxford University Press
    Details
    Publication Date: 2012-12-19
    Description: Background We examined if cancer patients' health-related quality of life (HRQoL) scores on the European Organisation for Research and Treatment of Cancer (EORTC) QLQ-C30 are affected by the specific time point, before or during treatment, at which the questionnaire is completed, and whether this could bias the overall treatment comparison analyses. Patients and methods A ‘completion-time window’ variable was created on three closed EORTC randomised control trials in lung (non-small cell lung cancer, NSCLC) and colorectal cancer (CRC) to indicate when the QLQ-30 was completed relative to chemotherapy cycle dates, defined as ‘before’, ‘on’ and ‘after’. HRQoL mean scores were calculated using a linear mixed model. Results Statistically significant differences ( P  〈 0.05) were observed on 6 and 5 scales for ‘on’ and ‘after’ comparisons in the NSCLC and two-group CRC trial, respectively. As for the three-group CRC trial, several statistical differences were observed in the ‘before’ to ‘on’ and the ‘on’ to ‘after’ comparisons. For all three trials, including the ‘completion-time window’ variable in the model resulted in a better fit, but no substantial changes in the treatment effects were noted. Conclusions We showed that considering the exact timing of completion within specified windows resulted in statistical and potentially clinically significant differences, but it did not alter the conclusions of treatment comparison in these studies.
    Print ISSN: 0923-7534
    Electronic ISSN: 1569-8041
    Topics: Medicine
    Published by Oxford University Press
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  • 10
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    Role of Pak1 in Ras Signaling (2012)
    The American Association for Cancer Research (AACR)
    Details
    Publication Date: 2012-11-16
    Description: The RAS genes are the most commonly mutated oncogenes in human cancer and present a particular therapeutic dilemma, as direct targeting of Ras proteins by small molecules has proved difficult. Signaling pathways downstream of Ras, in particular Raf/Mek/Erk and PI3K/Akt/mTOR, are dominated by lipid and protein kinases that provide attractive alternate targets in Ras-driven tumors. As p21-activated kinase 1 (Pak1) has been shown to regulate both these signaling pathways and is itself upregulated in many human cancers, we assessed the role of Pak1 in Ras-driven skin cancer. In human squamous cell carcinoma (SCC), we found a strong positive correlation between advanced stage and grade and PAK1 expression. Using a mouse model of Kras-driven SCC, we showed that deletion of the mouse Pak1 gene led to markedly decreased tumorigenesis and progression, accompanied by near total loss of Erk and Akt activity. Treatment of KrasG12D mice with either of two distinct small molecule Pak inhibitors (PF3758309 and FRAX597) caused tumor regression and loss of Erk and Akt activity. Tumor regression was also seen in mice treated with a specific Mek inhibitor, but not with an Akt inhibitor. These findings establish Pak1 as a new target in KRAS-driven tumors and suggest a mechanism of action through the Erk, but not the Akt, signaling pathway. Cancer Res; 72(22); 5966–75. ©2012 AACR.
    Print ISSN: 0008-5472
    Electronic ISSN: 1538-7445
    Topics: Medicine
    Published by The American Association for Cancer Research (AACR)
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