Trends in North Carolina's Oral Health Workforce.

Work remains in North Carolina to effectively increase access to oral health care and address the maldistribution of the dental workforce. This study provides updated data on the oral health workforce (from 2000 to 2022) in response to the recommendations outlined in the North Carolina Institute of Medicine Oral Health Transformation Task Force report.

An assessment of clinical outcomes of medication abortion without pretreatment ultrasonography in Planned Parenthood, United States, 2020-2021.

Objectives: Routine ultrasound before medication abortion (MAB) may create an impediment to expanding abortion access. This study examines clinical outcomes of MAB without pretreatment ultrasound evaluation at Planned Parenthood health centers in multiple states.

Study Design: We conducted a secondary analysis of data from 23 US-based Planned Parenthood affiliates that provided MAB without pretreatment ultrasound for eligible patients from March 2020 to December 2021.

Simultaneous bright- and dark-field X-ray microscopy at X-ray free electron lasers.

The structures, strain fields, and defect distributions in solid materials underlie the mechanical and physical properties across numerous applications. Many modern microstructural microscopy tools characterize crystal grains, domains and defects required to map lattice distortions or deformation, but are limited to studies of the (near) surface. Generally speaking, such tools cannot probe the structural dynamics in a way that is representative of bulk behavior.

Real-time imaging of acoustic waves in bulk materials with X-ray microscopy.

The dynamics of lattice vibrations govern many material processes, such as acoustic wave propagation, displacive phase transitions, and ballistic thermal transport. The maximum velocity of these processes and their effects is determined by the speed of sound, which therefore defines the temporal resolution (picoseconds) needed to resolve these phenomena on their characteristic length scales (nanometers). Here, we present an X-ray microscope capable of imaging acoustic waves with subpicosecond resolution within mm-sized crystals.

Electric-field-induced non-ergodic relaxor to ferroelectric transition in BiFeO-SrTiO ceramics.

While BiFeO-based solid solutions show great promise for applications in energy conversion and storage, realizing this promise necessitates understanding the structure-property relationship in particular pertaining to the relaxor-like characteristics often exhibited by solid solutions with polar-to-non-polar morphotropic phase boundaries. To this end, we investigated the role of the compositionally-driven relaxor state in (100 - )BiFeO-SrTiO [BFO-STO], synchrotron X-ray diffraction under bipolar electric-field cycling. The electric-field induced changes to the crystal structure, phase fraction and domain textures were monitored the {111}, {200}, and 1/2{311} Bragg peaks.

Simulating dark-field X-ray microscopy images with wavefront propagation techniques.

Dark-field X-ray microscopy is a diffraction-based synchrotron imaging technique capable of imaging defects in the bulk of extended crystalline samples. Numerical simulations are presented of image formation in such a microscope using numerical integration of the dynamical Takagi-Taupin equations and wavefront propagation. The approach is validated by comparing simulated images with experimental data from a near-perfect single crystal of diamond containing a single stacking-fault defect in the illuminated volume.

A finite difference scheme for integrating the Takagi-Taupin equations on an arbitrary orthogonal grid.

Calculating dynamical diffraction patterns for X-ray diffraction imaging techniques requires numerical integration of the Takagi-Taupin equations. This is usually performed with a simple, second-order finite difference scheme on a sheared computational grid in which two of the axes are aligned with the wavevectors of the incident and scattered beams. This dictates, especially at low scattering angles, an oblique grid of uneven step sizes.

An automated approach to the alignment of compound refractive lenses.

Compound refractive lenses (CRLs) are established X-ray focusing optics, and are used to focus the beam or image the sample in many beamlines at X-ray facilities. While CRLs are quite established, the stack of single lens elements affords a very small numerical aperture because of the thick lens profile, making them far more difficult to align than classical optical lenses that obey the thin-lens approximation. This means that the alignment must be very precise and is highly sensitive to changes to the incident beam, often requiring regular readjustments.

Unveiling the Interaction Mechanisms of Electron and X-ray Radiation with Halide Perovskite Semiconductors using Scanning Nanoprobe Diffraction.

The interaction of high-energy electrons and X-ray photons with beam-sensitive semiconductors such as halide perovskites is essential for the characterization and understanding of these optoelectronic materials. Using nanoprobe diffraction techniques, which can investigate physical properties on the nanoscale, studies of the interaction of electron and X-ray radiation with state-of-the-art (FA MA Cs )Pb(I Br ) hybrid halide perovskite films (FA, formamidinium; MA, methylammonium) are performed, tracking the changes in the local crystal structure as a function of fluence using scanning electron diffraction and synchrotron nano X-ray diffraction techniques. Perovskite grains are identified, from which additional reflections, corresponding to PbBr , appear as a crystalline degradation phase after fluences of 200 e Å .

National review of reported Yellow fever vaccine incidents in the UK.

Background: Yellow fever (YF) vaccination is the single most important preventative measure against YF infection, however the live attenuated vaccine has associated serious adverse events. All YF vaccinations in England, Wales and Northern Ireland (EWNI) are administered in YF Vaccination Centres and comply with National Travel Health Network and Centre (NaTHNaC) Conditions of Designation and Code of Practice, including reporting of vaccine incidents to NaTHNaC. In this study we evaluated the number and type of YF vaccine incidents in EWNI to identify areas for improvement.

Fourier ptychographic dark field x-ray microscopy.

Dark-field x-ray microscopy (DFXM) is an x-ray imaging technique for mapping three-dimensional (3D) lattice strain and rotation in bulk crystalline materials. At present, these maps of local structural distortions are derived from the raw intensity images using an incoherent analysis framework. In this work, we describe a coherent, Fourier ptychographic approach that requires little change in terms of instrumentation and acquisition strategy, and may be implemented on existing DFXM instruments.

Oxygen Vacancies Nucleate Charged Domain Walls in Ferroelectrics.

We study the influence of oxygen vacancies on the formation of charged 180° domain walls in ferroelectric BaTiO_{3} using first principles calculations. We show that it is favorable for vacancies to assemble in crystallographic planes, and that such clustering is accompanied by the formation of a charged domain wall. The domain wall has negative bound charge, which compensates the nominal positive charge of the vacancies and leads to a vanishing density of free charge at the wall.

In situ visualization of long-range defect interactions at the edge of melting.

Connecting a bulk material's microscopic defects to its macroscopic properties is an age-old problem in materials science. Long-range interactions between dislocations (line defects) are known to play a key role in how materials deform or melt, but we lack the tools to connect these dynamics to the macroscopic properties. We introduce time-resolved dark-field x-ray microscopy to directly visualize how dislocations move and interact over hundreds of micrometers deep inside bulk aluminum.

Introduction of telemedicine for medication abortion: Changes in service delivery patterns in two U.S. states.

Objective(s): Telemedicine for medication abortion (teleMAB) is safe and effective, yet little is known about how its introduction affects service delivery. We assessed changes in service delivery patterns 1 year after introducing teleMAB at Planned Parenthood in 2 U.S.

Conceptual Framework for Dislocation-Modified Conductivity in Oxide Ceramics Deconvoluting Mesoscopic Structure, Core, and Space Charge Exemplified for SrTiO.

The introduction of dislocations is a recently proposed strategy to tailor the functional and especially the electrical properties of ceramics. While several works confirm a clear impact of dislocations on electrical conductivity, some studies raise concern in particular when expanding to dislocation arrangements beyond a geometrically tractable bicrystal interface. Moreover, the lack of a complete classification on pertinent dislocation characteristics complicates a systematic discussion and hampers the design of dislocation-modified electrical conductivity.

Impact of dual-layer solid-electrolyte interphase inhomogeneities on early-stage defect formation in Si electrodes.

While intensive efforts have been devoted to studying the nature of the solid-electrolyte interphase (SEI), little attention has been paid to understanding its role in the mechanical failures of electrodes. Here we unveil the impact of SEI inhomogeneities on early-stage defect formation in Si electrodes. Buried under the SEI, these early-stage defects are inaccessible by most surface-probing techniques.

Imaging microstructural dynamics and strain fields in electro-active materials in situ with dark field x-ray microscopy.

The electric-field-induced and temperature induced dynamics of domains, defects, and phases play an important role in determining the macroscopic functional response of ferroelectric and piezoelectric materials. However, distinguishing and quantifying these phenomena remains a persistent challenge that inhibits our understanding of the fundamental structure-property relationships. In situ dark field x-ray microscopy is a new experimental technique for the real space mapping of lattice strain and orientation in bulk materials.

Perinatal Depressive Symptom Trajectories Among Adolescent Women in New York City.

Purpose: The aim of the study was to estimate distinct trajectories of depressive symptoms among adolescent women across the perinatal period.

Methods: Using longitudinal depressive symptom data (Center for Epidemiologic Studies Depression Scale) from control participants in the Centering Pregnancy Plus Project (2008-2012), we conducted group-based trajectory modeling to identify depressive symptomatology trajectories from early pregnancy to 1-year postpartum among 623 adolescent women in New York City. We examined associations between sociodemographic, psychosocial, and pregnancy characteristics and the outcome, depressive symptom trajectories.

The Clinical and Financial Impact of a Pharmacist-Driven Penicillin Skin Testing Program on Antimicrobial Stewardship Practices.

Pharmacist-led penicillin skin testing (PST) was incorporated into antimicrobial stewardship at a community hospital to increase use of optimal antimicrobial therapy, reduce use of broad-spectrum agents, and reduce antimicrobial therapy-related costs. A clinical decision support software alert identified qualifying patients with penicillin allergies. Patients receiving a nonoptimal antimicrobial agent were prioritized for PST.

Translative lens-based full-field coherent X-ray imaging.

A full-field coherent imaging approach suitable for hard X-rays based on a classical (i.e. Galilean) X-ray microscope is described.

Contraceptive counseling practices and patient experience: Results from a cluster randomized controlled trial at Planned Parenthood.

Objectives: Systematic reviews of contraceptive counseling interventions have shown inconsistent impact on patient outcomes. The current study assessed the effects of an evidence-informed contraceptive counseling staff training intervention on patient experience, contraceptive selection, and behavior over three months of follow-up.

Study Design: We randomly assigned 10 Planned Parenthood health centers in the Southeastern US to intervention (staff received contraceptive counseling training) and control (usual counseling) groups.

Medication Abortion Provided Through Telemedicine in Four U.S. States.

Objective: To assess outcomes of medication abortion provided through telemedicine compared with standard medication abortion at Planned Parenthood health centers in four U.S. states.