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  • 1
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    Matrix solid-phase dispersion extraction of organophosphorus pesticide using SiO 2 -poly(N-vinylimidazole) (2013)
    Institute of Physics (IOP)
    Details
    Publication Date: 2013-06-08
    Description: A sorbent material based on silica particles modified with poly(N-vinylimidazole) (SiO 2 -PVI) has been evaluated for the treatment of samples by matrix solid-phase dispersion (MSPD). The extraction of four organophosphorus pesticides was done from a spiked tomato and the extracts were analyzed by gas chromatography coupled to mass spectrometry. Six elution solvents were evaluated and acetone was selected due to better recovery of the four pesticides and low background signal in the chromatograms. A factorial design 2 4 was used for selection of extraction conditions. The factors were contact time, acetone volume, treatment (with or without freeze-drying) and adsorbent (SiO 2 or SiO 2 -PVI). The best recoveries were obtained using 15 minutes of contact, 2 mL of solvent and sorbent without freeze-drying. The recoveries were between 60 and 83% for SiO 2 -PVI in spiked tomato with 0.2 and 0.8μg/g.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 2
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    Recovery evaluation of organophosphorus pesticides from bee pollen by matrix solid-phase dispersion extraction using sorbents based on silica and titania (2013)
    Institute of Physics (IOP)
    Details
    Publication Date: 2013-06-08
    Description: This work focused on the evaluation of the recovery of organophosphorus pesticides from bee pollen after matrix solid phase-dispersion extraction (MSPD). Materials based on silica, titania and titania modified with polivylnylimidazole or polyestirene were used as adsorbents for the extraction of pesticides. Small amounts of fortified pollen (0.1 g, at 1 micro-g/g of pesticides), adsorbent (0.4 g) and solvent elution (1 mL de acetonitrile – ACN) were used in the extractions. For recovery evaluation, pollen extracts were analyzed by gas chromatography coupled with mass spectrometry.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 3
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    W ‐Phase Real‐Time Implementation and Network Expansion from 2012 to 2017: The Experience in Chile (2018)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2018
    Description: 〈span〉〈div〉ABSTRACT〈/div〉W‐phase algorithm has been proven to be a reliable and robust method to calculate the centroid moment tensor (CMT) for moderate and large earthquakes. For global purposes, the W‐phase algorithm is operating in real time at the National Earthquake Information Center (NEIC), the Institut de Physique du Globe de Strasbourg (IPGS), and Pacific Tsunami Warning Center (PTWC). Regional implementations are operating in Japan, Mexico, Australia, Taiwan, China, and Chile. In Chile, it has been implemented at the National Seismological Center (CSN) since 2011 for regional distances, obtaining accurate results of more than 300 events, while more than 100 broadband seismometers have been installed and incorporated by CSN. We compared our solutions with NEIC W‐phase moment tensor results and with the Global CMT. The threshold W‐phase magnitude for earthquakes occurred in Chile moved from Mw 6.5 with 36 broadband stations in 2012 to 4.8 with 106 stations along the country, producing a catalog that can be used for both operational and scientific purposes. If more stations and seismic data are available, it will be possible to characterize earthquakes faster and more accurately. For tsunami early warning purposes, collaboration among regional networks will be essential to issue fast tsunami warnings.〈/span〉
    Print ISSN: 0895-0695
    Electronic ISSN: 1938-2057
    Topics: Geosciences
    Published by Seismological Society of America (SSA)
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  • 4
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    Detection of Sulfur Dioxide by Cavity Ring-Down Spectroscopy (2011)
    American Chemical Society (ACS)
    Details
    Publication Date: 2011-02-11
    Description: Environmental Science & Technology DOI: 10.1021/es103739r
    Print ISSN: 0013-936X
    Electronic ISSN: 1520-5851
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by American Chemical Society (ACS)
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  • 5
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    Tsunami Hazard Evaluation in the Coquimbo Region Using Nonuniform Slip Distribution Sources (2019)
    Seismological Society of America (SSA)
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    Publication Date: 2019
    Description: 〈span〉〈div〉ABSTRACT〈/div〉The subduction interface in northern Chile hosts a large tsunamigenic potential that may trigger devastating tsunamis in the near future. To quantify tsunami hazard, mitigate economic losses, and improve planning and safety protocols for government entities, it is key to understand the behavior of the seismic and tsunami source. In this work, we used a stochastic approach to generate (slip) scenarios in a nonregular domain. All of them satisfy physical laws and show a moment magnitude defined by historical seismicity and recent Global Positioning System records based on seismic coupling. Each scenario sets an initial condition to be propagated, then flow depth and runup are computed in a high‐resolution grid. The junction of these data allows the creation of probability maps for several parameters, as runup, flow depth, and flux moments. This methodology is also valid to obtain the maximum inundation zone, which is compared to the official map of the Chilean government. The results suggest that the studied region has a notable tsunami hazard, which is reflected in the obtained inundation zone.〈/span〉
    Print ISSN: 0895-0695
    Electronic ISSN: 1938-2057
    Topics: Geosciences
    Published by Seismological Society of America (SSA)
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  • 6
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    Frequency domain description of Kohlrausch response through a pair of Havriliak-Negami-type functions: An analysis of functional proximity (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-12-17
    Description: Author(s): J. S. Medina, R. Prosmiti, P. Villarreal, G. Delgado-Barrio, and J. V. Alemán [Phys. Rev. E 84, 066703] Published Fri Dec 16, 2011
    Keywords: Computational physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    Cell-fate determination by ubiquitin-dependent regulation of translation (2015)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2015-09-25
    Description: Metazoan development depends on the accurate execution of differentiation programs that allow pluripotent stem cells to adopt specific fates. Differentiation requires changes to chromatin architecture and transcriptional networks, yet whether other regulatory events support cell-fate determination is less well understood. Here we identify the ubiquitin ligase CUL3 in complex with its vertebrate-specific substrate adaptor KBTBD8 (CUL3(KBTBD8)) as an essential regulator of human and Xenopus tropicalis neural crest specification. CUL3(KBTBD8) monoubiquitylates NOLC1 and its paralogue TCOF1, the mutation of which underlies the neurocristopathy Treacher Collins syndrome. Ubiquitylation drives formation of a TCOF1-NOLC1 platform that connects RNA polymerase I with ribosome modification enzymes and remodels the translational program of differentiating cells in favour of neural crest specification. We conclude that ubiquitin-dependent regulation of translation is an important feature of cell-fate determination.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4602398/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4602398/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Werner, Achim -- Iwasaki, Shintaro -- McGourty, Colleen A -- Medina-Ruiz, Sofia -- Teerikorpi, Nia -- Fedrigo, Indro -- Ingolia, Nicholas T -- Rape, Michael -- GM42341/GM/NIGMS NIH HHS/ -- R01 GM083064/GM/NIGMS NIH HHS/ -- S10RR025622/RR/NCRR NIH HHS/ -- S10RR027303/RR/NCRR NIH HHS/ -- S10RR029668/RR/NCRR NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2015 Sep 24;525(7570):523-7. doi: 10.1038/nature14978.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of California, Berkeley, California 94720, USA. ; Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26399832" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing/metabolism ; Animals ; *Cell Differentiation/genetics ; Cullin Proteins/metabolism ; Embryonic Stem Cells/cytology/metabolism ; Humans ; Mandibulofacial Dysostosis/genetics ; Neural Crest/*cytology/*metabolism ; Nuclear Proteins/genetics/metabolism ; Phosphoproteins/genetics/metabolism ; *Protein Biosynthesis ; Proteomics ; RNA Polymerase I/metabolism ; Ribosomes/chemistry/metabolism ; Ubiquitin/*metabolism ; Ubiquitination ; Xenopus
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 8
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    A gut lipid messenger links excess dietary fat to dopamine deficiency (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-08-21
    Description: Excessive intake of dietary fats leads to diminished brain dopaminergic function. It has been proposed that dopamine deficiency exacerbates obesity by provoking compensatory overfeeding as one way to restore reward sensitivity. However, the physiological mechanisms linking prolonged high-fat intake to dopamine deficiency remain elusive. We show that administering oleoylethanolamine, a gastrointestinal lipid messenger whose synthesis is suppressed after prolonged high-fat exposure, is sufficient to restore gut-stimulated dopamine release in high-fat-fed mice. Administering oleoylethanolamine to high-fat-fed mice also eliminated motivation deficits during flavorless intragastric feeding and increased oral intake of low-fat emulsions. Our findings suggest that high-fat-induced gastrointestinal dysfunctions play a key role in dopamine deficiency and that restoring gut-generated lipid signaling may increase the reward value of less palatable, yet healthier, foods.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tellez, Luis A -- Medina, Sara -- Han, Wenfei -- Ferreira, Jozelia G -- Licona-Limon, Paula -- Ren, Xueying -- Lam, Tukiet T -- Schwartz, Gary J -- de Araujo, Ivan E -- DC009997/DC/NIDCD NIH HHS/ -- DK020541/DK/NIDDK NIH HHS/ -- DK026687/DK/NIDDK NIH HHS/ -- DK085579/DK/NIDDK NIH HHS/ -- P30 DK026687/DK/NIDDK NIH HHS/ -- UL1RR024139/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2013 Aug 16;341(6147):800-2. doi: 10.1126/science.1239275.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The John B. Pierce Laboratory, New Haven, CT 06519, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23950538" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Appetite ; Corpus Striatum/*metabolism ; Dietary Fats/*administration & dosage ; Dopamine/deficiency/*metabolism ; Endocannabinoids/*administration & dosage/biosynthesis/*physiology ; Energy Intake ; Ethanolamines/*administration & dosage ; Feeding Behavior ; Gastrointestinal Tract/*metabolism ; Homeostasis ; Intestine, Small/metabolism ; Male ; Mice ; Mice, Inbred C57BL ; Oleic Acids/*administration & dosage/biosynthesis/*physiology ; PPAR alpha/genetics/metabolism ; Reward ; Signal Transduction ; Vagus Nerve/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Quality of input predicts vocabulary 3 years later [Psychological and Cognitive Sciences] (2013)
    National Academy of Sciences
    Details
    Publication Date: 2013-07-10
    Description: Children vary greatly in the number of words they know when they enter school, a major factor influencing subsequent school and workplace success. This variability is partially explained by the differential quantity of parental speech to preschoolers. However, the contexts in which young learners hear new words are also likely...
    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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  • 10
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    Mixed type multiple orthogonal polynomials: Perfectness and interlacing properties of zeros (2013)
    Elsevier
    Details
    Publication Date: 2013-02-01
    Print ISSN: 0024-3795
    Electronic ISSN: 1873-1856
    Topics: Mathematics
    Published by Elsevier
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