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1.
Nat Commun ; 14(1): 1763, 2023 03 30.
Article in English | MEDLINE | ID: mdl-36997521

ABSTRACT

Influenza virus infects millions of people annually and can cause global pandemics. Hemagglutinin (HA) is the primary component of commercial influenza vaccines (CIV), and antibody titer to HA is a primary correlate of protection. Continual antigenic variation of HA requires that CIVs are reformulated yearly. Structural organization of HA complexes have not previously been correlated with induction of broadly reactive antibodies, yet CIV formulations vary in how HA is organized. Using electron microscopy to study four current CIVs, we find structures including: individual HAs, starfish structures with up to 12 HA molecules, and novel spiked-nanodisc structures that display over 50 HA molecules along the complex's perimeter. CIV containing these spiked nanodiscs elicit the highest levels of heterosubtypic cross-reactive antibodies in female mice. Here, we report that HA structural organization can be an important CIV parameter and can be associated with the induction of cross-reactive antibodies to conserved HA epitopes.


Subject(s)
Influenza Vaccines , Influenza, Human , Orthomyxoviridae Infections , Female , Animals , Mice , Humans , Hemagglutinins , Antibodies, Viral , Hemagglutinin Glycoproteins, Influenza Virus , Cross Reactions
2.
AJNR Am J Neuroradiol ; 44(2): 157-164, 2023 02.
Article in English | MEDLINE | ID: mdl-36702499

ABSTRACT

BACKGROUND AND PURPOSE: Given the increased use of stereotactic radiosurgical thalamotomy and other ablative therapies for tremor, new biomarkers are needed to improve outcomes. Using resting-state fMRI and MR tractography, we hypothesized that a "connectome fingerprint" can predict tremor outcomes and potentially serve as a targeting biomarker for stereotactic radiosurgical thalamotomy. MATERIALS AND METHODS: We evaluated 27 patients who underwent unilateral stereotactic radiosurgical thalamotomy for essential tremor or tremor-predominant Parkinson disease. Percentage postoperative improvement in the contralateral limb Fahn-Tolosa-Marin Clinical Tremor Rating Scale (TRS) was the primary end point. Connectome-style resting-state fMRI and MR tractography were performed before stereotactic radiosurgery. Using the final lesion volume as a seed, "connectivity fingerprints" representing ideal connectivity maps were generated as whole-brain R-maps using a voxelwise nonparametric Spearman correlation. A leave-one-out cross-validation was performed using the generated R-maps. RESULTS: The mean improvement in the contralateral tremor score was 55.1% (SD, 38.9%) at a mean follow-up of 10.0 (SD, 5.0) months. Structural connectivity correlated with contralateral TRS improvement (r = 0.52; P = .006) and explained 27.0% of the variance in outcome. Functional connectivity correlated with contralateral TRS improvement (r = 0.50; P = .008) and explained 25.0% of the variance in outcome. Nodes most correlated with tremor improvement corresponded to areas of known network dysfunction in tremor, including the cerebello-thalamo-cortical pathway and the primary and extrastriate visual cortices. CONCLUSIONS: Stereotactic radiosurgical targets with a distinct connectivity profile predict improvement in tremor after treatment. Such connectomic fingerprints show promise for developing patient-specific biomarkers to guide therapy with stereotactic radiosurgical thalamotomy.


Subject(s)
Connectome , Essential Tremor , Radiosurgery , Humans , Tremor/diagnostic imaging , Tremor/surgery , Treatment Outcome , Thalamus/diagnostic imaging , Thalamus/surgery , Magnetic Resonance Imaging , Essential Tremor/surgery
3.
J Med Entomol ; 60(2): 417-421, 2023 03 06.
Article in English | MEDLINE | ID: mdl-36539325

ABSTRACT

Twelve Angus × Hereford crossbred heifers were used in a completely randomized design to evaluate the effects of monensin and diflubenzuron feed additives on horn fly (Haematobia irritans) (L.) and house fly (Musca domestica) (L.) immature development. Heifers were randomly assigned to one of four treatment groups; 1) monensin fed at label rate, 2) diflubenzuron fed at label rate, 3) monensin and diflubenzuron fed at label rates together, and 4) nonsupplemented control. All treatments were administered from SD 0 to 28, followed by a 16-d wash-out period for a total study duration of 45 d and assayed to assess adult fly emergence, as well as fecal pH and fecal bacterial and total protein. A treatment × day interaction (P < 0.01) was observed for adult fly emergence. Fly emergence was not affected (P ≥ 0.05) by monensin, but was reduced during the 28 d treatment period when diflubenzuron was present (P = 0.01). Fecal pH, fecal bacterial protein, and total protein were not affected by any of the treatments (P ≥ 0.13). It is concluded that diflubenzuron is effective against both horn and house fly development regardless of the presence of monensin.


Subject(s)
Cattle Diseases , Diflubenzuron , Houseflies , Muscidae , Cattle , Animals , Female , Monensin/pharmacology , Feces
4.
Mol Autism ; 13(1): 6, 2022 01 29.
Article in English | MEDLINE | ID: mdl-35093163

ABSTRACT

BACKGROUND: Phelan-McDermid syndrome (PMS) is caused by 22q13 deletions including SHANK3 or pathogenic sequence variants in SHANK3 and is among the more common rare genetic findings in autism spectrum disorder (ASD). SHANK3 is critical for synaptic function, and preclinical and clinical studies suggest that insulin-like growth factor-1 (IGF-1) can reverse a range of deficits in PMS. IGF-1 release is stimulated by growth hormone secretion from the anterior pituitary gland, and this study sought to assess the feasibility of increasing IGF-1 levels through recombinant human growth hormone (rhGH) treatment, in addition to establishing safety and exploring efficacy of rhGH in children with PMS. METHODS: rhGH was administered once daily for 12 weeks to six children with PMS using an open-label design. IGF-1 levels, safety, and efficacy assessments were measured every 4 weeks throughout the study. RESULTS: rhGH administration increased levels of IGF-1 by at least 2 standard deviations and was well tolerated without serious adverse events. rhGH treatment was also associated with clinical improvement in social withdrawal, hyperactivity, and sensory symptoms. LIMITATIONS: Results should be interpreted with caution given the small sample size and lack of a placebo control. CONCLUSIONS: Overall, findings are promising and indicate the need for larger studies with rhGH in PMS. Trial registration NCT04003207. Registered July 1, 2019, https://clinicaltrials.gov/ct2/show/NCT04003207 .


Subject(s)
Autism Spectrum Disorder , Human Growth Hormone , Autism Spectrum Disorder/genetics , Child , Chromosome Deletion , Chromosome Disorders , Chromosomes, Human, Pair 22 , Growth Hormone , Human Growth Hormone/therapeutic use , Humans , Insulin-Like Growth Factor I
5.
J Appl Psychol ; 107(5): 724-745, 2022 May.
Article in English | MEDLINE | ID: mdl-34591560

ABSTRACT

Political divisions appear to be relatively frequent in today's world. Indeed, individuals on opposing sides of these divisions often view each other very negatively. The present multi-study investigation contributes to the nascent literature on organizational political affiliation by examining how job seekers view organizations with political affiliations, a practice that is becoming more prevalent. Studies 1 and 2 indicated that many job seekers are aware of organizations' political affiliations or stances, and that they often considered these affiliations and stances during recent job searches. For example, nearly one-third of participants said they did not apply to an organization because of its political affiliation or stances. Study 3 showed that the extent to which job seekers identified with the organization's party affiliation positively influenced their reactions toward the organization (e.g., perceived similarity and liking), as well as their intention to pursue employment with the organization. In contrast, job seekers' disidentification with the organization's affiliation decreased their feelings of perceived similarity and liking. Study 4 demonstrated that organizational affiliation with a political issue (i.e., gun control/second amendment) also influenced perceptions of similarity and liking. Taken together, results suggest that organizations' affiliations with political parties or their stances on political issues can influence the amount and types of potential employees that organizations attract. (PsycInfo Database Record (c) 2022 APA, all rights reserved).


Subject(s)
Employment , Intention , Humans , Organizational Affiliation
6.
Nat Commun ; 12(1): 3936, 2021 Jun 24.
Article in English | MEDLINE | ID: mdl-34168125

ABSTRACT

Recent theoretical proposals have argued that cobaltates with edge-sharing octahedral coordination can have significant bond-dependent exchange couplings thus offering a platform in 3d ions for such physics beyond the much-explored realisations in 4d and 5d materials. Here we present high-resolution inelastic neutron scattering data within the magnetically ordered phase of the stacked honeycomb magnet CoTiO3 revealing the presence of a finite energy gap and demonstrate that this implies the presence of bond-dependent anisotropic couplings. We also show through an extensive theoretical analysis that the gap further implies the existence of a quantum order-by-disorder mechanism that, in this material, crucially involves virtual crystal field fluctuations. Our data also provide an experimental observation of a universal winding of the scattering intensity in angular scans around linear band-touching points for both magnons and dispersive spin-orbit excitons, which is directly related to the non-trivial topology of the quasiparticle wavefunction in momentum space near nodal points.

7.
Phys Rev Lett ; 126(1): 017201, 2021 Jan 08.
Article in English | MEDLINE | ID: mdl-33480800

ABSTRACT

We apply neutron spectroscopy to measure the magnetic dynamics in the S=3/2 magnet ß-CaCr_{2}O_{4} (T_{N}=21 K). The low-energy fluctuations, in the ordered state, resemble large-S linear spin waves from the incommensurate ground state. However, at higher energy transfers, these semiclassical and harmonic dynamics are replaced by an energy and momentum broadened continuum of excitations. Applying kinematic constraints required for energy and momentum conservation, sum rules of neutron scattering, and comparison against exact diagonalization calculations, we show that the dynamics at high-energy transfers resemble low-S one-dimensional quantum fluctuations. ß-CaCr_{2}O_{4} represents an example of a magnet at the border between classical Néel and quantum phases, displaying dual characteristics.

8.
Proc Natl Acad Sci U S A ; 117(52): 33396-33403, 2020 12 29.
Article in English | MEDLINE | ID: mdl-33328271

ABSTRACT

Repeatable, convergent outcomes are prima facie evidence for determinism in evolutionary processes. Among fishes, well-known examples include microevolutionary habitat transitions into the water column, where freshwater populations (e.g., sticklebacks, cichlids, and whitefishes) recurrently diverge toward slender-bodied pelagic forms and deep-bodied benthic forms. However, the consequences of such processes at deeper macroevolutionary scales in the marine environment are less clear. We applied a phylogenomics-based integrative, comparative approach to test hypotheses about the scope and strength of convergence in a marine fish clade with a worldwide distribution (snappers and fusiliers, family Lutjanidae) featuring multiple water-column transitions over the past 45 million years. We collected genome-wide exon data for 110 (∼80%) species in the group and aggregated data layers for body shape, habitat occupancy, geographic distribution, and paleontological and geological information. We also implemented approaches using genomic subsets to account for phylogenetic uncertainty in comparative analyses. Our results show independent incursions into the water column by ancestral benthic lineages in all major oceanic basins. These evolutionary transitions are persistently associated with convergent phenotypes, where deep-bodied benthic forms with truncate caudal fins repeatedly evolve into slender midwater species with furcate caudal fins. Lineage diversification and transition dynamics vary asymmetrically between habitats, with benthic lineages diversifying faster and colonizing midwater habitats more often than the reverse. Convergent ecological and functional phenotypes along the benthic-pelagic axis are pervasive among different lineages and across vastly different evolutionary scales, achieving predictable high-fitness solutions for similar environmental challenges, ultimately demonstrating strong determinism in fish body-shape evolution.


Subject(s)
Aquatic Organisms/physiology , Biological Evolution , Fishes/physiology , Water , Animals , Ecosystem , Models, Theoretical , Phylogeny , Phylogeography , Uncertainty
9.
Acute Med ; 19(4): 201-208, 2020.
Article in English | MEDLINE | ID: mdl-33215173

ABSTRACT

Demands on echocardiography services are increasing annually. This Quality Improvement Project aimed to see whether a point of care screening echocardiography (SE) service in the acute inpatient medical setting might help reduce demand on full trans-thoracic echocardiography services (FE). The indication and results of all FE requests on the admission ward were analysed over a three-month period. Following this, it was considered whether a theoretical SE occurring prior, would have changed the on-going utilisation of FE resources. Of the 67 requests analysed, 57 underwent FE. 25% revealed no abnormality. In 47%, a SE prior may have changed the future use of FE resources. This small retrospective review highlights the potential benefits of a SE service and further work is required.


Subject(s)
Echocardiography , Inpatients , Point-of-Care Systems , Hospitalization , Humans , Retrospective Studies
10.
Sci Rep ; 10(1): 18012, 2020 Oct 22.
Article in English | MEDLINE | ID: mdl-33093480

ABSTRACT

We have successfully grown centimeter-sized layered [Formula: see text] single crystals under high oxygen pressures of 120-150 bar by the floating zone technique. This enabled us to perform neutron scattering experiments where we observe close to quarter-integer magnetic peaks below [Formula: see text] that are accompanied by steep upwards dispersing spin excitations. Within the high-frequency Ni-O bond stretching phonon dispersion, a softening at the propagation vector for a checkerboard modulation can be observed. We were able to simulate the magnetic excitation spectra using a model that includes two essential ingredients, namely checkerboard charge disproportionation and nano phase separation. The results thus suggest that charge disproportionation is preferred instead of a Jahn-Teller distortion even for this layered [Formula: see text] system.

12.
Phys Rev Lett ; 124(7): 077202, 2020 Feb 21.
Article in English | MEDLINE | ID: mdl-32142335

ABSTRACT

Establishing the physical mechanism governing exchange interactions is fundamental for exploring exotic phases such as quantum spin liquids in real materials. In this Letter, we address exchange interactions in Sr_{2}CuTe_{x}W_{1-x}O_{6}, a series of double perovskites that realize a spin-1/2 square lattice and are suggested to harbor a quantum spin liquid ground state arising from the random distribution of nonmagnetic ions. Our ab initio multireference configuration interaction calculations show that replacing Te atoms with W atoms changes the dominant couplings from nearest to next-nearest neighbor due to the crucial role of unoccupied states of the nonmagnetic ions in the super-superexchange mechanism. Combined with spin-wave theory simulations, our calculated exchange couplings provide an excellent description of the inelastic neutron scattering spectra of the parent compounds, as well as explaining that the magnetic excitations in Sr_{2}CuTe_{0.5}W_{0.5}O_{6} emerge from bond-disordered exchange couplings. Our results demonstrate the crucial role of the nonmagnetic cations in exchange interactions paving the way to further explore quantum spin liquid phases in bond-disordered materials.

13.
Clin Microbiol Infect ; 26(4): 512.e1-512.e10, 2020 Apr.
Article in English | MEDLINE | ID: mdl-31536818

ABSTRACT

OBJECTIVES: We aimed to provide population-based and whole-genome sequence (WGS) -based characterization of invasive pneumococcal disease isolates collected from multistate surveillance in the USA during 2017. METHODS: We obtained short-read WGS from 2881 isolates with associated bioinformatics pipeline strain feature predictions. For quality control, capsular serotypes and antimicrobial MICs were also obtained conventionally from 442 isolates. Annotated WGS were provided (inclusive of serotypes, MICs, multilocus sequence types, pilus type(s)) from 2723 isolates. For 158 isolates with suboptimal WGS, antimicrobial MICs were obtained conventionally. RESULTS: There were 127 isolates from children <5 years of age and 2754 isolates from those ≥5 years old in 2017. One of 43 different serotypes was predicted for 2877 of the 2881 isolates. Serotypes in the 13-valent conjugate vaccine together with 6C (PCV13+6C) accounted for 816 (28.3%) isolates, with PCV13 serotype 3 being the most common serotype overall. Non-PCV13-6C- serotypes accounted for 2065 (71.7%) isolates, comprising 96 (75.6%) isolates from children < 5 years old and 1969 (61.4%) isolates from those aged ≥5 years. Of 36 different categories of recently emerged serotype-switch variants, three showed marked increases relative to 2015-2016 in that the number from 2017 surpassed the number from 2015-2016 combined. Two of these included antimicrobial-resistant serotype 11A and 35B serotype-switch variants of the ST156 clonal complex. CONCLUSIONS: PCV13+6C strains are still identified in 2017 but non-PCV13-type strains impose a considerable burden. This well-annotated year 2017 WGS/strain data set will prove useful for a broad variety of analyses and improved our understanding of invasive pneumococcal disease-causing strains in the post-PCV13 era.


Subject(s)
Epidemiological Monitoring , Genome, Bacterial , Pneumococcal Infections/epidemiology , Population Health/statistics & numerical data , Whole Genome Sequencing , Anti-Bacterial Agents/pharmacology , Bacterial Typing Techniques , Child, Preschool , Drug Resistance, Bacterial , Genotype , Humans , Infant , Microbial Sensitivity Tests , Multilocus Sequence Typing , Pneumococcal Infections/microbiology , Serogroup , Streptococcus pneumoniae/classification , Streptococcus pneumoniae/drug effects , United States/epidemiology
14.
BJOG ; 126(9): 1141-1147, 2019 Aug.
Article in English | MEDLINE | ID: mdl-31094064

ABSTRACT

OBJECTIVE: To investigate whether women using intravaginal progesterone suppositories for preterm birth prevention during pregnancy will have lower rates of group B streptococcus (GBS) colonisation at term, compared with women receiving intramuscular 17-alpha-hydroxyprogesterone caproate. DESIGN: This was a retrospective observational cohort study of women who were prescribed a progestogen during their pregnancy for preterm birth prevention, and who delivered at term. SETTING: A tertiary referral hospital in central Ohio. POPULATION: Patients who were prescribed a progestogen during their pregnancy for preterm birth prevention between 2004 and 2017 were included in the study. Patients who delivered at <37 weeks of pregnancy, switched progestogen type during the pregnancy, or had a pessary or cerclage placed were excluded. METHODS: Baseline characteristics were compared using Mann-Whitney U-test or Chi-square test as appropriate. The association between type of progestogen and GBS colonisation was assessed using bivariate and multivariable analyses. MAIN OUTCOME MEASURES: The primary outcome was GBS colonisation. RESULTS: In all, 565 patients were included in the study, of whom 173 received intravaginal progesterone, and 392 17-alpha-hydroxyprogesterone caproate. Patients receiving intravaginal progesterone were less likely to be colonised with GBS (19.7 versus 28.1%). After adjustments for potential confounders were made in a multivariable logistic regression analysis, receiving intravaginal progesterone suppositories (adjusted odds ratio [OR] 0.61, 95% CI 0.39-0.95) was associated with reduced GBS colonisation. CONCLUSIONS: Intravaginal progesterone is associated with a decreased prevalence of rectovaginal GBS colonisation at term. TWEETABLE ABSTRACT: Vaginal progesterone is associated with a lower incidence of rectovaginal GBS colonisation, compared with 17α-hydroxyprogesterone caproate.


Subject(s)
Bacterial Load/drug effects , Premature Birth/prevention & control , Progesterone/administration & dosage , Progestins/administration & dosage , Streptococcus agalactiae/growth & development , Administration, Intravaginal , Adult , Chi-Square Distribution , Female , Humans , Infant, Newborn , Logistic Models , Multivariate Analysis , Pregnancy , Premature Birth/microbiology , Retrospective Studies , Statistics, Nonparametric , Vagina/microbiology
15.
J Phys Condens Matter ; 31(18): 185803, 2019 May 08.
Article in English | MEDLINE | ID: mdl-30721882

ABSTRACT

X-ray magnetic critical scattering measurements and specific heat measurements were performed on the perovskite iridate [Formula: see text]. We find that the magnetic interactions close to the Néel temperature [Formula: see text] are three-dimensional. This contrasts with previous studies which suggest two-dimensional behaviour like Sr2IrO4. Violation of the Harris criterion ([Formula: see text]) means that weak disorder becomes relevant. This leads a rounding of the antiferromagnetic phase transition at [Formula: see text], and modifies the critical exponents relative to the clean system. Specifically, we determine that the critical behaviour of [Formula: see text] is representative of the diluted 3D Ising universality class.

16.
Nat Commun ; 9(1): 4138, 2018 10 08.
Article in English | MEDLINE | ID: mdl-30297766

ABSTRACT

Quantum spin liquids (QSLs) are exotic states of matter characterized by emergent gauge structures and fractionalized elementary excitations. The recently discovered triangular lattice antiferromagnet YbMgGaO4 is a promising QSL candidate, and the nature of its ground state is still under debate. Here we use neutron scattering to study the spin excitations in YbMgGaO4 under various magnetic fields. Our data reveal a dispersive spin excitation continuum with clear upper and lower excitation edges under a weak magnetic field (H = 2.5 T). Moreover, a spectral crossing emerges at the Γ point at the Zeeman-split energy. The corresponding redistribution of the spectral weight and its field-dependent evolution are consistent with the theoretical prediction based on the inter-band and intra-band spinon particle-hole excitations associated with the Zeeman-split spinon bands, implying the presence of fractionalized excitations and spinon Fermi surfaces in the partially magnetized QSL state in YbMgGaO4.

17.
Phys Rev Lett ; 121(10): 107203, 2018 Sep 07.
Article in English | MEDLINE | ID: mdl-30240241

ABSTRACT

The spin-1/2 kagome antiferromagnet is an archetypal frustrated system predicted to host a variety of exotic magnetic states. We show using neutron scattering measurements that deuterated vesignieite BaCu_{3}V_{2}O_{8}(OD)_{2}, a fully stoichiometric S=1/2 kagome magnet with <1% lattice distortion, orders magnetically at T_{N}=9 K into a multi-k coplanar variant of the predicted triple-k octahedral structure. We find that this structure is stabilized by a dominant antiferromagnetic third-neighbor exchange J_{3} with minor first- or second-neighbor exchanges. The spin-wave spectrum is well described by a J_{3}-only model including a tiny symmetric exchange anisotropy.

18.
Phys Rev Lett ; 121(8): 087201, 2018 Aug 24.
Article in English | MEDLINE | ID: mdl-30192563

ABSTRACT

RbFe^{2+}Fe^{3+}F_{6} is an example of a charge ordered antiferromagnet where iron sites, with differing valences, are structurally separated into two interpenetrating sublattices. The low temperature magnetically ordered Fe^{2+} (S=2) and Fe^{3+} (S=5/2) moments form a noncollinear orthogonal structure with the Fe^{3+} site displaying a reduced static ordered moment. Neutron spectroscopy on single crystals finds two distinct spin wave branches with a dominant coupling along the Fe^{3+} chain axis (b axis). High resolution spectroscopic measurements find an intense energy and momentum broadened magnetic band of scattering bracketing a momentum-energy region where two magnon processes are kinematically allowed. These anharmonic excitations are enhanced in this noncollinear magnet owing to the orthogonal spin arrangement.

19.
Phys Rev Lett ; 121(6): 067002, 2018 Aug 10.
Article in English | MEDLINE | ID: mdl-30141678

ABSTRACT

Understanding magnetic interactions in the parent compounds of high-temperature superconductors forms the basis for determining their role for the mechanism of superconductivity. For parent compounds of iron pnictide superconductors such as AFe_{2}As_{2} (A=Ba, Ca, Sr), although spin excitations have been mapped out throughout the entire Brillouin zone, the respective measurements were carried out on twinned samples and did not allow for a conclusive determination of the spin dynamics. Here we use inelastic neutron scattering to completely map out spin excitations of ∼100% detwinned BaFe_{2}As_{2}. By comparing observed spectra with theoretical calculations, we conclude that the spin excitations can be well described by an itinerant model when taking into account moderate electronic correlation effects.

20.
Nat Commun ; 9(1): 1085, 2018 03 14.
Article in English | MEDLINE | ID: mdl-29540711

ABSTRACT

A quantum spin liquid state has long been predicted to arise in spin-1/2 Heisenberg square-lattice antiferromagnets at the boundary region between Néel (nearest-neighbor interaction dominates) and columnar (next-nearest-neighbor interaction dominates) antiferromagnetic order. However, there are no known compounds in this region. Here we use d10-d0 cation mixing to tune the magnetic interactions on the square lattice while simultaneously introducing disorder. We find spin-liquid-like behavior in the double perovskite Sr2Cu(Te0.5W0.5)O6, where the isostructural end phases Sr2CuTeO6 and Sr2CuWO6 are Néel and columnar type antiferromagnets, respectively. We show that magnetism in Sr2Cu(Te0.5W0.5)O6 is entirely dynamic down to 19 mK. Additionally, we observe at low temperatures for Sr2Cu(Te0.5W0.5)O6-similar to several spin liquid candidates-a plateau in muon spin relaxation rate and a strong T-linear dependence in specific heat. Our observations for Sr2Cu(Te0.5W0.5)O6 highlight the role of disorder in addition to magnetic frustration in spin liquid physics.

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