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  1. Book ; Online: Correlation Driven Magnetic Frustration and Insulating Behavior of TiF$_3$

    Fernando, Gayanath W. / Sheets, Donal / Hancock, Jason / Ernst, Arthur / Geilhufe, R. Matthias

    2023  

    Abstract: We investigate the halide perovskite TiF$_3$, renowned for its intricate interplay between structure, electronic correlations, magnetism, and thermal expansion. Despite its simple structure, understanding its low-temperature magnetic behavior has been a ... ...

    Abstract We investigate the halide perovskite TiF$_3$, renowned for its intricate interplay between structure, electronic correlations, magnetism, and thermal expansion. Despite its simple structure, understanding its low-temperature magnetic behavior has been a challenge. Previous theories proposed antiferromagnetic ordering. In contrast, experimental signatures for an ordered magnetic state are absent down to 10~K. Our current study has successfully reevaluated the theoretical modeling of TiF$_3$, unveiling the significance of strong electronic correlations as the key driver for its insulating behavior and magnetic frustration. In addition, our frequency-dependent optical reflectivity measurements exhibit clear signs of an insulating state. Analysis of the calculated magnetic data gives an antiferromagnetic exchange coupling with a net Weiss temperature of order 25~K as well as a magnetic response consistent with a $S$=1/2 local moment per Ti$^{3+}$. Yet, the system shows no susceptibility peak at this temperature scale and appears free of long-range antiferromagnetic order down to 1~K. Extending ab initio modeling of the material to larger unit cells shows a tendency for relaxing into a non-collinear magnetic ordering, with a shallow energy landscape between several magnetic ground states, promoting the status of this simple, nearly cubic perovskite structured material as a candidate spin liquid.

    Comment: 6 pages, 5 figures
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science ; Physics - Computational Physics
    Subject code 530
    Publishing date 2023-10-19
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Comment on "Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks".

    Hancock, Jason N / Plumley, Michael J / Schilling, Katherine / Sheets, Donal / Wilen, Lawrence

    ACS nano

    2020  Volume 14, Issue 9, Page(s) 10758–10763

    MeSH term(s) Aerosols ; Filtration ; Masks ; Textiles
    Chemical Substances Aerosols
    Keywords covid19
    Language English
    Publishing date 2020-09-22
    Publishing country United States
    Document type Letter ; Comment
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.0c05827
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Book ; Online: Mott insulating negative thermal expansion perovskite TiF3

    Sheets, Donal / Lyszak, Kaitlin / Jain, Menka / Fernando, Gayanath W. / Sochnikov, Ilya / Franklin, Jacob / Geilhufe, R. Mattias / Hancock, Jason N.

    2023  

    Abstract: We characterize perovskite TiF_3, a material which displays significant negative thermal expansion at elevated temperatures above its cubic-to-rhombohedral structural phase transition at 330 K. We find the optical response favors an insulating state in ... ...

    Abstract We characterize perovskite TiF_3, a material which displays significant negative thermal expansion at elevated temperatures above its cubic-to-rhombohedral structural phase transition at 330 K. We find the optical response favors an insulating state in both structural phases, which we show can be produced in density functional theory calculations only through the introduction of an on-site Coulomb repulsion. Analysis of the magnetic susceptibility data gives a S=1/2 local moment per Ti+3 ion and an antiferromagnetic exchange coupling. Together, these results show that TiF_3 is a strongly correlated electron system, a fact which constrains possible mechanisms of strong negative thermal expansion in the Sc_1-xTi_xF3 system. We consider the relative strength of the Jahn-Teller and electric dipole interactions in driving the structural transition.

    Comment: 8 pages, 4 figures, in review Physical Review B
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science ; Condensed Matter - Other Condensed Matter
    Subject code 530
    Publishing date 2023-11-14
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article: Comment on "Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks"

    Hancock, Jason N / Plumley, Michael J / Schilling, Katherine / Sheets, Donal / Wilen, Lawrence

    ACS Nano

    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #783464
    Database COVID19

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  5. Article ; Online: An apparatus for rapid and nondestructive comparison of masks and respirators.

    Sheets, Donal / Shaw, Jamie / Baldwin, Michael / Daggett, David / Elali, Ibrahim / Curry, Erin B / Sochnikov, Ilya / Hancock, Jason N

    The Review of scientific instruments

    2020  Volume 91, Issue 11, Page(s) 114101

    Abstract: The SARS-CoV-2 global pandemic has produced widespread shortages of certified air-filtering personal protection equipment and an acute need for rapid evaluation of breathability and filtration efficiency of proposed alternative solutions. Here, we ... ...

    Abstract The SARS-CoV-2 global pandemic has produced widespread shortages of certified air-filtering personal protection equipment and an acute need for rapid evaluation of breathability and filtration efficiency of proposed alternative solutions. Here, we describe experimental efforts to nondestructively quantify three vital characteristics of mask approaches: breathability, material filtration effectiveness, and sensitivity to fit. We focus on protection against aqueous aerosols >0.3 μm using off-the-shelf particle, flow, and pressure sensors, permitting rapid comparative evaluation of these three properties. We present and discuss both the pressure drop and the particle penetration as a function of flow to permit comparison of relative protection for a set of proposed filter and mask designs. The design considerations of the testing apparatus can be reproduced by university laboratories and medical facilities and used for rapid local quality control of respirator masks that are of uncertified origin, monitoring the long-term effects of various disinfection schemes and evaluating improvised products not designed or marketed for filtration.
    MeSH term(s) Aerosols ; Air Microbiology ; Air Movements ; Air Pressure ; COVID-19/prevention & control ; COVID-19/transmission ; Equipment Design/standards ; Face ; Filtration/instrumentation ; Humans ; Masks/standards ; Materials Testing/instrumentation ; Materials Testing/standards ; N95 Respirators/standards ; Pandemics/prevention & control ; Particle Size ; Respiratory Protective Devices/standards ; SARS-CoV-2
    Chemical Substances Aerosols
    Language English
    Publishing date 2020-11-27
    Publishing country United States
    Document type Comparative Study ; Evaluation Study ; Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0015983
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 4' 46/112: Show issues

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  6. Article ; Online: Exploring itinerant states in divalent hexaborides using rare-earth L edge resonant inelastic x-ray scattering.

    Sheets, Donal / Flynn, Vincent / Kim, Jungho / Upton, Mary / Casa, Diego / Gog, Thomas / Fisk, Zachary / Dzero, Maxim / Rosa, Priscila F S / Mazzone, Daniel G / Jarrige, Ignace / Zhu, Jian-Xin / Hancock, Jason

    Journal of physics. Condensed matter : an Institute of Physics journal

    2019  Volume 32, Issue 13, Page(s) 135601

    Abstract: We present a study of resonant inelastic x-ray scattering (RIXS) spectra collected at the rare-earth L edges of divalent hexaborides ... ...

    Abstract We present a study of resonant inelastic x-ray scattering (RIXS) spectra collected at the rare-earth L edges of divalent hexaborides YbB
    Language English
    Publishing date 2019-11-29
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/ab5e0f
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  7. Article: An apparatus for nondestructive and rapid comparison of mask approaches in defense against infected respiratory aerosols

    Sheets, Donal / Shaw, Jamie / Baldwin, Michael / Daggett, David / Elali, Ibrahim / Curry, Erin / Sochnikov, Ilya / Hancock, Jason N.

    Abstract: At the front lines of the world's response to the COVID-19 pandemic are hero-clinicians facing a lack of critical supplies including protective medical grade breathing masks and filtering materials. At the same time, the general public is now being ... ...

    Abstract At the front lines of the world's response to the COVID-19 pandemic are hero-clinicians facing a lack of critical supplies including protective medical grade breathing masks and filtering materials. At the same time, the general public is now being advised to wear masks to help stop the spread. As a result, in the absence of centrally coordinated production and distribution efforts, supply chains for masks, respirators, and materials for advanced filtration technology are immensely burdened. Here we describe experimental efforts to nondestructively quantify three vital characteristics of mask approaches: breathability, material filtration effectiveness, and sensitivity to fit. We focus on protection against water aerosols $>$0.3$\mu$m using off-the-shelf particulate, flow, and pressure sensors, permitting rapid comparative evaluation of these three properties. We present and discuss both the pressure drop and the particle transmission as a function of flow to permit comparison of relative protection for a set of proposed filter and mask designs. The design considerations of the testing apparatus can be reproduced by university laboratories and medical facilities and used for rapid local quality control of respirator masks which are of uncertified origin, monitoring the long-term effects of various disinfection schemes, and evaluating improvised products not designed or marketed for filtration.
    Keywords covid19
    Publisher ArXiv
    Document type Article
    Database COVID19

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  8. Book ; Online: An apparatus for nondestructive and rapid comparison of mask approaches in defense against infected respiratory aerosols

    Sheets, Donal / Shaw, Jamie / Baldwin, Michael / Daggett, David / Elali, Ibrahim / Curry, Erin / Sochnikov, Ilya / Hancock, Jason N.

    2020  

    Abstract: At the front lines of the world's response to the COVID-19 pandemic are hero-clinicians facing a lack of critical supplies including protective medical grade breathing masks and filtering materials. At the same time, the general public is now being ... ...

    Abstract At the front lines of the world's response to the COVID-19 pandemic are hero-clinicians facing a lack of critical supplies including protective medical grade breathing masks and filtering materials. At the same time, the general public is now being advised to wear masks to help stop the spread. As a result, in the absence of centrally coordinated production and distribution efforts, supply chains for masks, respirators, and materials for advanced filtration technology are immensely burdened. Here we describe experimental efforts to nondestructively quantify three vital characteristics of mask approaches: breathability, material filtration effectiveness, and sensitivity to fit. We focus on protection against water aerosols $>$0.3$\mu$m using off-the-shelf particulate, flow, and pressure sensors, permitting rapid comparative evaluation of these three properties. We present and discuss both the pressure drop and the particle transmission as a function of flow to permit comparison of relative protection for a set of proposed filter and mask designs. The design considerations of the testing apparatus can be reproduced by university laboratories and medical facilities and used for rapid local quality control of respirator masks which are of uncertified origin, monitoring the long-term effects of various disinfection schemes, and evaluating improvised products not designed or marketed for filtration.

    Comment: submitted, May 2020
    Keywords Physics - Instrumentation and Detectors ; Physics - Medical Physics ; covid19
    Subject code 670
    Publishing date 2020-06-03
    Publishing country us
    Document type Book ; Online
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  9. Article ; Online: TurboID functions as an efficient biotin ligase for BioID applications in Xenopus embryos.

    Kanzler, Charlotte R / Donohue, Michael / Dowdle, Megan E / Sheets, Michael D

    Developmental biology

    2022  Volume 492, Page(s) 133–138

    Abstract: BioID is a proximity labeling strategy whose goal is to identify in vivo protein-protein interactions. The central components of this strategy are modified biotin ligase enzymes that promiscuously add biotin groups to proteins in close proximity. The ... ...

    Abstract BioID is a proximity labeling strategy whose goal is to identify in vivo protein-protein interactions. The central components of this strategy are modified biotin ligase enzymes that promiscuously add biotin groups to proteins in close proximity. The transferred biotin group provides a powerful tag for purification and thus identification of interacting proteins. While a variety of modified biotin ligases were created for BioID, the original enzymes were inefficient, required long incubation times, and high intracellular biotin concentrations for protein labeling. These limitations hinder the application of BioID in contexts such as developing embryos where processes such as cell division and cell fate decisions occur rapidly. Recently, a new biotin ligase called TurboID was developed that addressed many of the deficiencies of previous enzymes. In this paper we compare TurboID to the BioID2 biotin ligase in developing Xenopus embryos. We find that the TurboID enzyme has several advantages over the BioID2 enzyme. TurboID labels proteins efficiently without the addition of additional biotin and occurs at a range of temperatures compatible with the culturing of Xenopus embryos. Biotinylation events occurred rapidly and were limited by TurboID expression and not its activity. Thus, TurboID is an efficient tool for BioID applications in Xenopus embryos and its use should facilitate the identification of interacting proteins in specific networks and complexes during Xenopus development.
    MeSH term(s) Animals ; Biotin ; Xenopus laevis ; Biotinylation ; Ligases
    Chemical Substances Biotin (6SO6U10H04) ; Ligases (EC 6.-)
    Language English
    Publishing date 2022-10-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 1114-9
    ISSN 1095-564X ; 0012-1606
    ISSN (online) 1095-564X
    ISSN 0012-1606
    DOI 10.1016/j.ydbio.2022.10.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 508: Show issues Location:
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    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
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  10. Article: Palm Bruising in Infants: A Recognizable Pattern of Abuse.

    Ruiz-Maldonado, Tagrid M / Johnson, Katie L / Sabo, Jennifer L / Sheets, Lynn K / Laskey, Antoinette

    The Journal of emergency medicine

    2021  Volume 61, Issue 2, Page(s) 198–204

    Abstract: Background: Bruising in an infant is an important sentinel injury that should raise concern for child physical abuse, and should prompt a medical evaluation for occult injury. Hyperflexion during forceful squeezing of an infant's hand results in a ... ...

    Abstract Background: Bruising in an infant is an important sentinel injury that should raise concern for child physical abuse, and should prompt a medical evaluation for occult injury. Hyperflexion during forceful squeezing of an infant's hand results in a distinct pattern of bruising along the palmar and interdigital creases, as well as the palmar eminences. Self-inflicted injury by the infant or injury resulting from benign handling should not be accepted as plausible explanations for this injury. The presence of concurrent occult injuries is common, and further supports concerns for abuse. However, when this distinct pattern of palm bruising is identified in an infant, the absence of occult injuries should not prevent the recognition of child physical abuse.
    Case report: We report 11 cases depicting this distinct pattern of palm bruising in infants. Additionally, we include a perpetrator's documented confession. To the best of our knowledge, this pattern of bruising has not been previously described in the medical literature. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: Emergency physicians play a crucial role in recognizing and addressing child physical abuse. Prompt recognition of this finding can aid in the identification of child physical abuse, even in the absence of underlying occult injury. This, in turn, can potentially prevent further injury, and even death, of an infant.
    MeSH term(s) Child ; Child Abuse/diagnosis ; Contusions/etiology ; Humans ; Infant ; Physical Abuse
    Language English
    Publishing date 2021-03-29
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 605559-x
    ISSN 0736-4679
    ISSN 0736-4679
    DOI 10.1016/j.jemermed.2021.02.018
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    In stock of ZB MED Cologne/Königswinter

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