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  • 1
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    The distributions, C- and O-isotopic compositions, and frequency of giant-ooids
    PANGAEA
    In:  Supplement to: Li, Fei; Yan, Jiaxin; Algeo, Thomas J; Wu, Xia (2013): Palaeoceanographic conditions following the end-Permian mass extinction recorded by giant ooids (Moyang, South China). Global and Planetary Change, 105, 102-120, https://doi.org/10.1016/j.gloplacha.2011.09.009
    Details
    Publication Date: 2023-05-12
    Description: Early Triassic oceans were characterized by deposition of a number of "anachronistic facies", including microbialites, seafloor carbonate cement fans, and giant ooids. Giant ooids were particularly prevalent in Lower Triassic sections across South China and exhibit unusual features that may provide insights into marine environmental conditions following the end-Permian mass extinction. The section at Moyang (Guizhou Province) contains abundant giant ooids ranging in size between 2 and 6 mm (maximum 12 mm) and exhibiting various cortical structures, including regular, deformed, compound, regenerated and "domed". Preservation of ooid cortical structure is generally good as indicated by petrographic observations, and trace element and carbon isotope analyses suggest that diagenesis occurred in a closed diagenetic system. All ooids exhibit fine concentric laminae, frequently alternating between light-colored coarsely crystalline and dark-colored finely crystalline layers probably reflecting variation in organic content or original mineralogy. Under scanning electron microscope, biomineralized filaments or biofilms and tiny carbonate fluorapatite (CFA) crystals are commonly found in the finely crystalline layers. We infer that the precipitation of CFA was related to adsorption of P via microbial activity on the surfaces of ooids following episodic incursions of deep waters rich in carbon dioxide, hydrogen sulfide and phosphate into shallow-marine environments. Giant ooid precipitation may have been promoted in shallow ramp settings during these events by increased watermass agitation and supersaturation with respect to calcium carbonate, as well as reduced carbonate removal rates through biotic skeletal formation. Spatio-temporal distribution data reveal that giant ooids were widespread in the Tethyan region during the Early Triassic, and that they were most abundant immediately after the end-Permian crisis and disappeared gradually as metazoans repopulated marine environments.
    Keywords: DRILL; Drilling/drill rig; Moyang village, Luodian County, Guizhou Province, China; MY-1A; MY-1B
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 2
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    δ¹³C and δ¹⁸O stable isotope ratios of giant-ooids from Moyang
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: after McCrea, 1950; DRILL; Drilling/drill rig; Moyang village, Luodian County, Guizhou Province, China; MY-1B; Sample code/label; Sample type; δ13C, calcite; δ18O, calcite
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
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    DATA PANGAEA
  • 3
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    Ooid and bioclast frequency data
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: DRILL; Drilling/drill rig; Moyang village, Luodian County, Guizhou Province, China; MY-1A; Ooids; Proportion; Sample code/label; SECTION, height; Thin section counted; Thin section estimated
    Type: Dataset
    Format: text/tab-separated-values, 167 data points
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    DATA PANGAEA
  • 4
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    Ooid occurence compilation from literature (2013)
    PANGAEA
    Details
    Publication Date: 2024-04-13
    Keywords: Area/locality; Environment; Geologic age name; Literature search; Reference/source; Size
    Type: Dataset
    Format: text/tab-separated-values, 185 data points
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    DATA PANGAEA
  • 5
    Electronic Resource
    Electronic Resource
    Light-emitting diodes based on an alternating copolymer containing triphenylamine and phenylene units (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2295-2297 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical and electroluminescence properties of a light-emitting poly(arylene vinylene) derivative comprising triphenylamine as the arylene unit (TPA–PPV) are demonstrated. TPA–PPV is soluble in common organic solvents, and has a high photoluminescent (PL) quantum yield (ΦPL=0.94 in benzene). A single-layer light-emitting diode Indium–tin–oxide/TPA–PPV/Al utilizing blue–green light-emitting TPA–PPV as the emissive layer is fabricated, and luminance in excess of 612 cd/m2, turn-on voltages of 1.5 V, and high luminous efficiency (3.0 lm/w) are reported. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123829
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    Paper (German National Licenses)
    Fulltext
  • 6
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    Identification of photosynthetic plankton communities using sedimentary ancient DNA and their response to late-Holocene climate change on the Tibetan Plateau (2014)
    Nature Publishing Group
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2014]. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Scientific Reports 4 (2014): 6648, doi:10.1038/srep06648.
    Description: Sediments from Tibetan lakes in NW China are potentially sensitive recorders of climate change and its impact on ecosystem function. However, the important plankton members in many Tibetan Lakes do not make and leave microscopically diagnostic features in the sedimentary record. Here we established a taxon-specific molecular approach to specifically identify and quantify sedimentary ancient DNA (sedaDNA) of non-fossilized planktonic organisms preserved in a 5-m sediment core from Kusai Lake spanning the last 3100 years. The reliability of the approach was validated with multiple independent genetic markers. Parallel analyses of the geochemistry of the core and paleo-climate proxies revealed that Monsoon strength-driven changes in nutrient availability, temperature, and salinity as well as orbitally-driven changes in light intensity were all responsible for the observed temporal changes in the abundance of two dominant phytoplankton groups in the lake, Synechococcus (cyanobacteria) and Isochrysis (haptophyte algae). Collectively our data show that global and regional climatic events exhibited a strong influence on the paleoecology of phototrophic plankton in Kusai Lake.
    Description: This research was supported by grants from the National Natural Science Foundation of China (Grant Nos. 41030211 and 41302022), the National Basic Research Program of China (Grant No. 2011CB808800), and State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Nos GBL11410 and GBL11201).
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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    PAPER (OA)
  • 7
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    TrkB Activation by 7, 8-Dihydroxyflavone Increases Synapse AMPA Subunits and Ameliorates Spatial Memory Deficits in a Mouse Model of Alzheimer's Disease (2015)
    Wiley-Blackwell
    Details
    Publication Date: 2015-11-21
    Description: We recently demonstrated that activation of tyrosine receptor kinase B (TrkB) by 7, 8-dihydroxyflavone (7, 8-DHF), the selective TrkB agonist, increased surface AMPA receptors (AMPARs) GluA1 subunit expression at the synapses of Fragile X Syndrome mutant mice. This present study investigated the effects of 7, 8-DHF on both memory function and synapse structure in relation to the synapse protein level of AMPARs in the Tg2576 Alzheimer's disease (AD) mouse model. The study found that chronic oral administration of 7, 8-DHF significantly improved spatial memory and minimized dendrite loss in the hippocampus of Tg2576 mice. A key feature of 7, 8-DHF action was the increased expression of both GluA1 and GluA2 at synapses. Interestingly, 7, 8-DHF had no effect on the attenuation of APP or Aβ exhibiting in the Tg2576 AD brains, yet it activated the phosphorylation of TrkB receptors and its downstream signals including CaMKII, Akt, Erk1/2, and CREB. Importantly, cyclotraxin B (a TrkB inhibitor), U0126 (a Ras-ERK pathway inhibitor), Wortmannin (an Akt phosphorylation inhibitor), and KN-93 (a CaMKII inhibitor) counteracted the enhanced expression and phosphorylation of AMPAR subunits induced by 7, 8-DHF. Collectively, our results demonstrated that 7, 8-DHF acted on TrkB and resolved learning and memory impairments in the absence of reduced amyloid in APP transgenic mice partially through improved synaptic structure and enhanced synaptic AMPARs. The findings suggest that the application of 7, 8-DHF may be a promising new approach to improve cognitive abilities in AD. This article is protected by copyright. All rights reserved.
    Print ISSN: 0022-3042
    Electronic ISSN: 1471-4159
    Topics: Medicine
    Published by Wiley-Blackwell on behalf of The International Society for Neurochemistry.
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  • 8
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    Screening of candidate genes and fine mapping of drought tolerance quantitative trait loci on chromosome 4 in rice (Oryza sativa L.) under drought stress (2015)
    Wiley-Blackwell
    Details
    Publication Date: 2015-10-17
    Description: Due to severe water resource shortage, genetics of and breeding for DT (drought tolerance) in rice ( Oryza sativa L.) have become one of the hot research topics. Identification of grain yield QTLs (quantitative trait loci) directly related to the DT trait of rice can provide useful information for breeding new drought-resistant and water-saving rice varieties via marker-assisted selection. A population of 105 advanced BILs (backcross introgression lines) derived from a cross between Zhenshan97B and IRAT109 in Zhenshan97B background were grown under drought stress in a field experiment and phenotypic traits were investigated. The results showed that in the target interval of RM273-RM255 on chromosome 4, three main-effect QTLs related to panicle length, panicle number, and spikelet number per panicle were identified (LOD [logarithm of the odds] 〉 2.0). The panicle length-related QTL had two loci located in the neighboring intervals of RM17308-RM17305 and RM17349-RM17190, which explained 18.80% and 20.42%, respectively, of the phenotypic variation, while the panicle number-related QTL was identified in the interval of RM1354-RM17308, explaining 11.47% of the phenotypic variation. As far as the spikelet number per panicle-related QTL was concerned, it was found to be located in the interval of RM17308-RM17305, which explained 28.08% of the phenotypic variation. Using the online Plant-GE query system, a total of 13 matched ESTs (expressed sequence tags) were found in the target region, and of the 13 ESTs, 12 had corresponding predicted genes. For instance, the two ESTs CB096766 and CA765747 were corresponded to the same predicted gene LOC_Os04g46370 , while the other four ESTs, CA754286, CB000011, CX056247, and CX056240, were corresponded to the same predicted gene LOC_Os04g46390 . Some drought tolerance QTLs of chromosome 4 in rice were finely mapped under drought stress, and candidate genes of them were screened also by using the online Plant-GE query system.
    Electronic ISSN: 2045-7758
    Topics: Biology
    Published by Wiley-Blackwell
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  • 9
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    A single crystalline InP nanowire photodetector (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-08-06
    Description: Single crystalline nanowires are critical for achieving high-responsivity, high-speed, and low-noise nanoscale photodetectors. Here, we report a metal-semiconductor-metal photodetector based on a single crystalline InP nanowire. The nanowires are grown by a self-catalyzed method and exhibit stacking-fault-free zinc blende crystal structure. The nanowire exhibits a typical n-type semiconductor property and shows a low room temperature dark current of several hundred pA at moderate biases. A photoresponsivity of 6.8 A/W is obtained at a laser power density of 0.2 mW/cm 2 . This work demonstrates that single crystalline InP nanowires are good candidates for future optoelectronic device applications.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 10
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    Density functional calculations of a staggered FeSe monolayer on a SrTiO_{3} (110) surface (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-07-15
    Description: Author(s): Xianxin Wu, Xia Dai, Yi Liang, Congcong Le, Heng Fan, and Jiangping Hu We investigate the electronic and magnetic properties of FeSe monolayer on the anisotropic SrTiO 3 (110) surface. With compressive strain along the [ 1 1 ¯ 0 ] direction from the substrate, the monolayer FeSe possesses a staggered bipartite iron lattice with a height difference around 0.06 Å along the out… [Phys. Rev. B 94, 045114] Published Thu Jul 14, 2016
    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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