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  • 1
    Electronic Resource
    Electronic Resource
    Oxidation of alcohols by hexanuclear cluster ions (1993)
    s.l. : American Chemical Society
    Inorganic chemistry 32 (1993), S. 4643-4645 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00073a029
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Oxygen quenching of electronically excited hexanuclear molybdenum and tungsten halide clusters (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 4500-4507 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100374a029
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Rain-pools on peat moorland as island habitats for midge larvae (1991)
    Springer
    Hydrobiologia 209 (1991), S. 59-65 
    Details
    ISSN: 1573-5117
    Keywords: temporary habitats ; peat pools ; habitat islands ; chironomids ; condensed running head: temporary pools on peat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A common aquatic habitat on peat moorland is a pool, often only a few centimetres deep. Many have a shorter average duration than that of the inhabitants but they are, nonetheless, inhabited by the larval stages of several chironomid species at moderately high densities. Because of their durational characteristics, these pools might be expected to have an endemic fauna, as is the case in similar ephemeral island habitats elsewhere. However, we find no such fauna. Indeed, we find no qualitative difference between them and permanent pools of the same substratum. We identify three reasons for the apparent absence of endemism. First, the midge fauna is able to survive dry periods in the moist mud, so that even the smallest pools are effectively permanent from the adaptive point of view. Second, although seasonal freezing eliminates the fauna of smaller pools, larvae are able to complete their development in the preceding summer. Third, nearby permanent pools which do not dry and in which the mud does not freeze, may act as refugia for re-invasion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006718
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  • 4
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    Qatar (2022)
    Archaeopress Publishing | Archaeopress Publishing Ltd
    Details
    Publication Date: 2024-04-02
    Description: "Qatar: Evidence of the Palaeolithic Earliest People Revealed, with full text in both English and Arabic, tells the story of the long and difficult search to discover the identity of the first people to inhabit the sovereign State of Qatar, which is situated on a peninsula, that extends into the Arabian Gulf. The book synthesises the results of extensive fieldwork by the PADMAC Unit with the many diverse historical records and reports of investigations, beginning with Holgar Kapel’s, in the early 1950s. The archaeology of the State of Qatar is an important part of the cultural heritage of the world. The loss of archaeological sites to urban and industrial development since the 1950s has been inevitable but the loss of over 30 years of Palaeolithic research in Qatar, an area of prehistoric significance, as a result of academic dissension, is certainly regrettable. The work of the PADMAC Unit in Qatar now marks the end of this Palaeolithic research hiatus."
    Keywords: History ; Middle East ; Arabian Peninsula ; thema EDItEUR::N History and Archaeology::NH History::NHG Middle Eastern history
    Language: Arabic
    Format: image/jpeg
    Format: image/jpeg
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    E-BOOK
  • 5
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    Lightweight Mechanical Metamaterials with Tunable Negative Thermal Expansion (2016)
    American Physical Society
    Details
    Publication Date: 2016-10-21
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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  • 6
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    Efficient Singlet Oxygen Generation from Polymers Derivatized with Hexanuclear Molybdenum Clusters (1996)
    American Chemical Society
    Details
    Publication Date: 1996-01-01
    Print ISSN: 0897-4756
    Electronic ISSN: 1520-5002
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by American Chemical Society
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  • 7
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    Full vector low-temperature magnetic measurements of geologic materials (2015)
    Wiley
    Details
    Publication Date: 2015-01-15
    Description: The magnetic properties of geologic materials offer insights into an enormous range of important geophysical phenomena ranging from inner core dynamics to paleoclimate. Often it is the low-temperature behavior (〈300K) of magnetic minerals that provides the most useful and highest sensitivity information for a given problem. Conventional measurements of low-temperature remanence are typically conducted on instruments that are limited to measuring one single axis component of the magnetization vector and are optimized for measurements in strong fields. These instrumental limitations have prevented fully optimized applications and have motivated the development of a low-temperature probe that can be used for low-temperature remanence measurements between 17 and 300K along three orthogonal axes using a standard 2G Enterprises SQuID rock magnetometer. In this contribution, we describe the design and implementation of this instrument and present data from five case studies that demonstrate the probe's considerable potential for future research: a polycrystalline hematite sample, a polycrystalline hematite and magnetite mixture, a single crystal of magnetite, a single crystal of pyrrhotite and samples of Umkondo Large Igneous Province diabase sills. This article is protected by copyright. All rights reserved.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 8
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    Postprandial enrichment of triacylglycerol-rich lipoproteins with omega-3 fatty acids: lack of an interaction with apolipoprotein E genotype? (2014)
    BioMed Central
    Details
    Publication Date: 2014-09-17
    Description: Background: We have previously demonstrated that carrying the apolipoprotein (apo) E epsilon 4 (E4+) genotype disrupts omega-3 fatty acids (n - 3 PUFA) metabolism. Here we hypothesise that the postprandial clearance of n - 3 PUFA from the circulation is faster in E4+ compared to non-carriers (E4-). The objective of the study was to investigate the fasted and postprandial fatty acid (FA) profile of triacylglycerol-rich lipoprotein (TRL) fractions: Sf 〉400 (predominately chylomicron CM), Sf 60 - 400 (VLDL1), and Sf 20 - 60 (VLDL2) according to APOE genotype. Methods: Postprandial TRL fractions were obtained in 11 E4+ (epsilon3/epsilon4) and 12 E4- (epsilon3/epsilon3) male from the SATgenepsilon study following high saturated fat diet + 3.45 g/d of docosahexaenoic acid (DHA) for 8-wk. Blood samples were taken at fasting and 5-h after consuming a test-meal representative of the dietary intervention. FA were characterized by gas chromatography. Results: At fasting, there was a 2-fold higher ratio of eicosapentaenoic acid (EPA) to arachidonic acid (P = 0.046) as well as a trend towards higher relative% of EPA (P = 0.063) in the Sf 〉400 fraction of E4+. Total n - 3 PUFA in the Sf 60 - 400 and Sf 20 - 60 fractions were not APOE genotype dependant. At 5 h, there was a trend towards a time x genotype interaction (P = 0.081) for EPA in the Sf 〉400 fraction. When sub-groups were form based on the level of EPA at baseline within the Sf 〉400 fraction, postprandial EPA (%) was significantly reduced only in the high-EPA group. EPA at baseline significantly predicted the postprandial response in EPA only in E4+ subjects (R2 = 0.816). Conclusion: Despite the DHA supplement contain very low levels of EPA, E4+ subjects with high EPA at fasting potentially have disrupted postprandial n - 3 PUFA metabolism after receiving a high-dose of DHA.Trial registration: Registered at clinicaltrials.gov as NCT01384032.
    Electronic ISSN: 1476-511X
    Topics: Biology
    Published by BioMed Central
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  • 9
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    Curie temperatures of titanomagnetite in ignimbrites: Effects of emplacement temperatures, cooling rates, exsolution, and cation ordering (2014)
    Wiley
    Details
    Publication Date: 2014-11-08
    Description: Pumices, ashes and tuffs from Mt. St. Helens and from Novarupta contain two principal forms of titanomagnetite: homogeneous grains with Curie temperatures in the range 350-500°C; and oxyexsolved grains with similar bulk composition, containing ilmenite lamellae, and having Curie temperatures above 500°C. Thermomagnetic analyses and isothermal annealing experiments in combination with stratigraphic settings and thermal models show that emplacement temperatures and cooling history may have affected the relative proportions of homogeneous and exsolved grains, and have clearly had a strong influence on the Curie temperature of the homogeneous phase. The exsolved grains are most common where emplacement temperatures exceeded 600°C, and in laboratory experiments, heating to over 600°C in air causes the homogeneous titanomagnetites to oxyexsolve rapidly. Where emplacement temperatures were lower, Curie temperatures of the homogeneous grains are systematically related to overburden thickness and cooling timescales, and thermomagnetic curves are generally irreversible, with lower Curie temperatures measured during cooling, but little or no change is observed in room-temperature susceptibility. We interpret this irreversible behavior as reflecting variations in the degree of cation ordering in the titanomagnetites, although we cannot conclusively rule out an alternative interpretation involving fine-scale subsolvus unmixing. Short-range ordering within the octahedral sites may play a key role in the observed phenomena. Changes in the Curie temperature have important implications for the acquisition, stabilization and retention of natural remanence, and may in some cases enable quantification of the emplacement temperatures or cooling rates of volcanic units containing homogeneous titanomagnetites.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    Malleable Curie temperatures of natural titanomagnetites: Occurrences, modes and mechanisms (2018)
    Wiley
    Details
    Publication Date: 2018-01-25
    Description: Intermediate-composition titanomagnetites have Curie temperatures ( T c ) that depend not only on composition but also on thermal history, with increases of 100°C or more in T c produced by moderate-temperature (300-400° C) annealing in the laboratory or in slow natural cooling, and comparable decreases produced by more rapid cooling (“quenching”) from higher temperatures. New samples spanning a range of titanomagnetite compositions exhibit reversible changes in T c comparable to those previously documented for pyroclastic samples from Mt St Helens and Novarupta. Additional high- and low-temperature measurements help to shed light on the nanoscale mechanisms responsible for the observed changes in T c . High-T hysteresis measurements exhibit a peak in high-field slope k hf ( T ) at the Curie temperature, and the peak magnitude decreases as T c increases with annealing. Sharp changes in low-T magnetic behavior are also strongly affected by prior annealing or quenching, suggesting that these treatments affect the intrasite cation distributions. We have examined the effects of oxidation state and nonstoichiometry on the magnitude of T c changes produced by quenching/annealing in different atmospheres. Treatments in air generally cause large changes (Δ T c 〉100°). In an inert atmosphere, the changes are similar in many samples but strongly diminished in others. When the samples are embedded in a reducing material, Δ T c becomes insignificant. These results strongly suggest that cation vacancies play an essential role in the cation rearrangements responsible for the observed changes in T c . Some form of octahedral-site chemical clustering or short-range ordering appears to be the best way to explain the large observed changes in T c .
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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