Publications by authors named "McDowell M"

Anode-free solid-state batteries contain no active material at the negative electrode in the as-manufactured state, yielding high energy densities for use in long-range electric vehicles. The mechanisms governing charge-discharge cycling of anode-free batteries are largely controlled by electro-chemo-mechanical phenomena at solid-solid interfaces, and there are important mechanistic differences when compared with conventional lithium-excess batteries. This Perspective provides an overview of the factors governing lithium nucleation, growth, stripping and cycling in anode-free solid-state batteries, including mechanical deformation of lithium, the chemical and mechanical properties of the current collector, microstructural effects, and stripping dynamics.

View Article and Find Full Text PDF

Solid-state batteries (SSBs) with silicon anodes could enable improved safety and energy density compared to lithium-ion batteries. However, degradation arising from the massive volumetric changes of silicon anodes during cycling is not well understood in solid-state systems. Here, we use X-ray computed microtomography to reveal micro- to macro-scale chemo-mechanical degradation processes of silicon anodes in SSBs.

View Article and Find Full Text PDF
Article Synopsis
  • - The ability of viruses to infect various hosts is typically limited by fitness trade-offs, where mutations that help in one host may harm another, a concept known as antagonistic pleiotropy.
  • - However, there is increasing evidence of positive pleiotropy, where beneficial mutations can enhance fitness across multiple hosts, indicating that these mutations could help overcome fitness trade-offs.
  • - A meta-analysis reveals that while both antagonistic and positive pleiotropy exist, positive pleiotropy is common, suggesting that many fitness trade-offs can be surmounted by evolution when proper selection pressures are applied.
View Article and Find Full Text PDF

Purpose: This Hydrocephalus Clinical Research Network (HCRN) study had two aims: (1) to compare the predictive performance of the original ETV Success Score (ETVSS) using logistic regression modeling with other newer machine learning models and (2) to assess whether inclusion of imaging variables improves prediction performance using machine learning models.

Methods: We identified children undergoing first-time ETV for hydrocephalus that were enrolled prospectively at HCRN sites between 200 and 2020. The primary outcome was ETV success 6 months after index surgery.

View Article and Find Full Text PDF

Platelet aggregation is intimately associated with vascular inflammation and is commonly seen on routine histology studies of cerebral aneurysms. Platelets, when activated, have been shown to augment neutrophil response and the pro-inflammatory cascade. Platelet-neutrophil complexes have been found to aggravate atherosclerosis through a positive feedback loop.

View Article and Find Full Text PDF

This study assesses differences in opioid use disorder (OUD) treatment among sexually and gender diverse (SGD) vs non-SGD people. Using electronic health record data from a federally qualified health center, this retrospective cohort study explores OUD treatment for adults with an OUD diagnosis, as well as any clinic visit from January 2013 until June 2021 (N = 1,133), through review of medication prescriptions for OUD and OUD-related visits. Patients identifying as lesbian/gay had the lowest prevalence of OUD, with 1% (n = 231) of lesbian/gay patients having an OUD diagnosis, as compared to 1.

View Article and Find Full Text PDF
Article Synopsis
  • Arteriovenous malformations (AVMs) are a leading cause of spontaneous intracranial hemorrhage (ICH) in children, with previous research indicating that younger age and aneurysms increase the risk of hemorrhagic events.
  • A study conducted at the Children's Hospital of Pittsburgh reviewed 238 pediatric patients with AVMs from 1988 to 2023, finding that 18.5% had associated aneurysms and many presented with hemorrhage.
  • The results showed no significant difference in hemorrhagic presentation between patients with AVM-associated aneurysms and those with solitary AVMs, but specific types of aneurysms and drainage characteristics were linked to lower or higher likelihoods of hemorrhage.
View Article and Find Full Text PDF

Background: Phlebotomus papatasi is considered the primary vector of Leishmania major parasites that cause zoonotic cutaneous leishmaniasis (ZCL) in the Middle East and North Africa. Phlebotomus papatasi populations have been studied extensively, revealing the existence of different genetic populations and subpopulations over its large distribution range. Genetic diversity and population structure analysis using transcriptome microsatellite markers is important to uncover the vector distribution dynamics, essential for controlling ZCL in endemic areas.

View Article and Find Full Text PDF

Much of our visual experience of faces, including our own, is mediated by technology, for example when a digital photo depicts a mirror reversal of reality. How does this difference in visual experience affect judgments about appearance? Here, we asked participants to view their likeness in photographs that were reversed (as when viewed in a mirror) or not reversed (as when viewed directly). Observers also perceptually adapted (or not) to the reversed or non-reversed images in a 2 × 2 design.

View Article and Find Full Text PDF

The HIV prevalence in Maputo city is 16.2%. There is a lack of data describing associated factors with disclosure or non-disclosure of HIV-positive sero-status to sexual partners.

View Article and Find Full Text PDF

Sand flies infect more than 1 million people annually with Leishmania parasites and other bacterial and viral pathogens. Progress in understanding sand fly adaptations to xenobiotics has been hampered by the limited availability of genomic resources. To address this gap, we sequenced, assembled, and annotated the transcriptomes of 11 phlebotomine sand fly species.

View Article and Find Full Text PDF

Phlebotomine sand flies are the vectors of leishmaniasis, a neglected tropical disease. High-quality reference genomes are an important tool for understanding the biology and eco-evolutionary dynamics underpinning disease epidemiology. Previous leishmaniasis vector reference sequences were limited by sequencing technologies available at the time and inadequate for high-resolution genomic inquiry.

View Article and Find Full Text PDF

Leishmaniasis, a disease of global relevance, results from infection with the protozoan parasite, , which is transmitted to susceptible hosts through the bite of sand flies. Multiple forms of leishmaniasis may occur, including cutaneous, mucocutaneous, and visceral. Research with animal models remains an important approach to help define basic pathophysi- ologic processes associated with infection and disease.

View Article and Find Full Text PDF

Solid-state batteries with Li metal anodes can offer increased energy density compared to Li-ion batteries. However, the performance of pure Li anodes has been limited by morphological instabilities at the interface between Li and the solid-state electrolyte (SSE). Composites of Li metal with other materials such as carbon and Li alloys have exhibited improved cycling stability, but the mechanisms associated with this enhanced performance are not clear, especially at the low stack pressures needed for practical viability.

View Article and Find Full Text PDF

Mental illness is a significant public health concern prevalent in America. Over one in five U.S.

View Article and Find Full Text PDF

Objective: When the peritoneal cavity cannot serve as the distal shunt terminus, nonperitoneal shunts, typically terminating in the atrium or pleural space, are used. The comparative effectiveness of these two terminus options has not been evaluated. The authors directly compared shunt survival and complication rates for ventriculoatrial (VA) and ventriculopleural (VPl) shunts in a pediatric cohort.

View Article and Find Full Text PDF

In societies without writing, ethnographically known rituals have rarely been tracked back archaeologically more than a few hundred years. At the invitation of GunaiKurnai Aboriginal Elders, we undertook archaeological excavations at Cloggs Cave in the foothills of the Australian Alps. In GunaiKurnai Country, caves were not used as residential places during the early colonial period (mid-nineteenth century CE), but as secluded retreats for the performance of rituals by Aboriginal medicine men and women known as 'mulla-mullung', as documented by ethnographers.

View Article and Find Full Text PDF

Lithium alloy anodes in the form of dense foils offer significant potential advantages over lithium metal and particulate alloy anodes for solid-state batteries (SSBs). However, the reaction and degradation mechanisms of dense alloy anodes remain largely unexplored. Here, we investigate the electrochemical lithiation/delithiation behavior of 12 elemental alloy anodes in SSBs with LiPSCl solid-state electrolyte (SSE), enabling direct behavioral comparisons.

View Article and Find Full Text PDF

The Eukaryotic Pathogen, Vector and Host Informatics Resources ( VEuPathDB.org ) provide free online access to omic data from eukaryotic protozoan and fungal pathogens, arthropod vectors of disease, and host responses to pathogen infection. The goal of VEuPathDB is to make data easily accessible, findable, and importantly, re-usable by laboratory scientists.

View Article and Find Full Text PDF

Control over material structure and morphology during electrodeposition is necessary for material synthesis and energy applications. One approach to guide crystallite formation is to take advantage of epitaxy on a current collector to facilitate crystallographic control. Single-layer graphene on metal foils can promote "remote epitaxy" during Cu and Zn electrodeposition, resulting in growth of metal that is crystallographically aligned to the substrate beneath graphene.

View Article and Find Full Text PDF
Article Synopsis
  • The study focuses on comparing different keyhole transorbital surgical approaches, called transwing approaches, used for accessing the cranial cavity via the sphenoid wing. Four main techniques are analyzed: lateral orbitocraniotomy, modified orbitozygomatic (palpebral and eyebrow), and supraorbital craniotomy.
  • Cadaveric dissections were conducted on four fixed heads to evaluate the exposure and limitations of each surgical technique. A fifth head was examined endoscopically to provide an overview of transwing approaches.
  • Results indicate that while the lateral orbitocraniotomy is more versatile in the middle cranial fossa, the modified orbitozygomatic approaches (both via palpebral
View Article and Find Full Text PDF

The 2022 Russian invasion of Ukraine has caused serious challenges for healthcare workers (HCWs) and HIV-related healthcare services. This study assessed the effects of the invasion on HCWs wellbeing and on continuity of HIV services, using in-depth interviews with HCWs from facilities offering HIV antiretroviral therapy (ART) and pre-exposure prophylaxis (PrEP) services in the Donetsk region of Eastern Ukraine. A directed content analysis, with both inductive and deductive approaches, was conducted.

View Article and Find Full Text PDF

FungiDB (https://fungidb.org) serves as a valuable online resource that seamlessly integrates genomic and related large-scale data for a wide range of fungal and oomycete species. As an integral part of the VEuPathDB Bioinformatics Resource Center (https://veupathdb.

View Article and Find Full Text PDF

Background: Over one-third of people living with HIV (PLH) in Ukraine are not on treatment. Index testing services, which link potentially exposed partners (named partners) of known PLH (index patients) with testing and treatment services, are being scaled in Ukraine and could potentially close this gap.

Methods: This retrospective study included patient data from 14,554 adult PLH who initiated antiretroviral treatment (ART) between October 2018 and May 2021 at one of 35 facilities participating in an intervention to strengthen index testing services.

View Article and Find Full Text PDF