33,355 results on '"McClain A"'
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2. New Developments in Transformative Learning
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Adam L. McClain
- Abstract
Rooted in nearly five decades of scholarly research, transformative learning theory explores how individuals construct and reinterpret their experiences, leading to profound change. This chapter delves into the foundational principles of transformative learning within adult education, highlighting its significance and broad applications. It starts with a definition of transformative learning, moves through traditional perspectives, reviews effective practices, addresses critiques, and calls for a unified theory and metatheory. It concludes with an overview of recent scholarly contributions. The chapter outlines the evolving nature of transformative learning, emphasizing its theoretical developments and the ongoing efforts to synthesize various perspectives. As the field progresses, the pivotal role of transformative learning in fostering deep and meaningful change in adult education is continually reinforced.
- Published
- 2024
- Full Text
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3. Valerie McClain Interview, Jean Sacconaghi Strauss, CAL Crew Interviews
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McClain, Valerie
- Subjects
150w ,UCB ,Women's Rowing History Project - Published
- 2025
4. On the Kostant-Souriau prequantization of scalar fields with polysymplectic structures
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McClain, Tom
- Subjects
Mathematical Physics ,Quantum Physics - Abstract
In this paper, I present a novel, purely differential geometric approach to the quantization of scalar fields, with a special focus on the familiar case of Minkowski spacetimes. This approach is based on using the natural geometric structures of polysymplectic Hamiltonian field theory to produce an analog of the Kostant-Souriau prequantization map familiar from geometric quantization. I show that while the resulting operators are quite different from those of canonical quantum field theory, the approach is nonetheless able to reproduce a few of canonical quantum field theory's most fundamental results. I finish by elaborating the current limitations of this approach and briefly discussing future prospects.
- Published
- 2024
5. Maximum likelihood degree of the $\beta$-stochastic blockmodel
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Bortner, Cashous, Garbett, Jennifer, Gross, Elizabeth, McClain, Christopher, Krawzik, Naomi, and Young, Derek
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Mathematics - Statistics Theory - Abstract
Log-linear exponential random graph models are a specific class of statistical network models that have a log-linear representation. This class includes many stochastic blockmodel variants. In this paper, we focus on $\beta$-stochastic blockmodels, which combine the $\beta$-model with a stochastic blockmodel. Here, using recent results by Almendra-Hern\'{a}ndez, De Loera, and Petrovi\'{c}, which describe a Markov basis for $\beta$-stochastic block model, we give a closed form formula for the maximum likelihood degree of a $\beta$-stochastic blockmodel. The maximum likelihood degree is the number of complex solutions to the likelihood equations. In the case of the $\beta$-stochastic blockmodel, the maximum likelihood degree factors into a product of Eulerian numbers.
- Published
- 2024
6. The Influence of Historically Marginalized Undergraduate Students' Perceptions of STEM on Their Academic and Career Choices
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Jessica McClain and Gayle Buck
- Abstract
Research has shown that university students approach STEM fields with preconceived notions that has the ability to influence their future STEM trajectories. Several scholarly investigations have explored pedagogical methodologies that not only recognize but actively validate the varied proficiencies that these pupils possess. This nested mixed methods study contributes to this work. Data sources included a survey, a card sorting activity, and student written reflections. By employing a thematic data analysis framework, the results indicated that students held the following perceptions of STEM: (1) STEM is task-oriented; (2) STEM is bound together by external ties; and (3) STEM is both optimistic and cognizant of the journey ahead. These results highlight the correlation between the perceptions and experiences of marginalized students in STEM. The study's implications suggest that to address the obstacles presented by external factors that hinder the acknowledgment of underrepresented students in STEM fields, policymakers, and academic institutions should take proactive steps to establish mitigation strategies.
- Published
- 2024
7. Mastering a Life-Saving Technique: Analysis of Learning from a Cricothyrotomy Workshop
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Cole J. Homer, Kristy Carlson, Nolan Marshall, Randi Peavy, Christopher M. Bingcang, John McClain, and Jayme R. Dowdall
- Abstract
Cricothyrotomy is an emergency procedure that is utilized in situations that require immediate access to a breathing pathway. This procedure may be performed by professionals in a variety of healthcare fields depending upon the specific emergency scenario, so the development of an interprofessional workshop is imperative for procedural confidence and skill development. Our team developed a training workshop with a specific focus on procedural skills, risks, benefits, and psychological ramifications associated with a cricothyrotomy procedure. Pre-workshop and post-workshop surveys were obtained for comparison of participant confidence. Overall, the organization and delivery of a cricothyrotomy training workshop significantly increased the overall participant confidence surrounding this procedure.
- Published
- 2024
8. Recommendations for Academic Programs to Best Support Occupational Therapy Students: Student Perspectives
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Elena Wong Espiritu, Hanna McClain, and R. David Phillippi
- Abstract
Declining occupational therapy student mental health and well-being is well described in the literature. However, there is a lack of literature describing recommendations from the student perspective that could help academic programs as they develop and implement support programming. Involving students in the process can be beneficial as they are experts in their experiences. The purpose of this qualitative descriptive study was to describe recommendations current occupational therapy students had for their academic programs to best support them during their educational experience. The study sample consisted of 628 entry-level masters and doctoral occupational therapy students from 31 states. Participant responses to one open-ended question compromised the raw data. Data was analyzed line by line using a multi-tiered coding process. Five themes emerged from the data related to faculty/student interactions, in-classroom learning, out of classroom support, programmatic recommendations, and no recommendations. Many of the participants' recommendations were consistent with the general recommendations found in the literature. However, occupational therapy academic programs could incorporate the participants' recommendations into their local level programming while also highlighting occupational therapy's distinct values. To promote student well-being, consider all contexts and factors that impact their students' occupational performance and incorporating meaningful, occupation-based activities inside and outside of the classroom. As occupational therapy programs are successful in supporting their students, they could contribute to their university systems' wider campus efforts highlighting the profession's unique role in promoting health and well-being.
- Published
- 2024
9. A PSA I'm Here Too: Exploring the Harmful Experiences of Black Students through Critical Narratives
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Jessica McClain and Dianne Wellington
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The paper illustrates the digital narratives of 219 Black students within the K-12 educational setting of a large West coast state in the United States. The researchers employed the method of storytelling to analyze Instagram posts created by students, which aimed to shed light on the various forms of injustice experienced by Black students. These online contributions effectively revitalized the significance of Black students' narratives and encounters with racism. The authors posit that educational institutions should reconsider their approach to mitigating the negative consequences encountered by Black students within educational environments. The present study serves as a call to action for educators and stakeholders to confront systemic anti-Blackness and create inclusive educational environments that prioritize the well-being and success of all students. Through collective effort and a commitment to antiracist practices, we can work towards a more equitable and just educational system. Addressing objectification and Whiteness requires a comprehensive approach that surpasses individual actions. Educators must acknowledge the ramifications of racially insensitive behavior and its impact on Black students in K-12 environments.
- Published
- 2024
10. Reading Skills and Background Noise in Autistic and Non-Autistic Children: A Pilot Study
- Author
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Maryellen Brunson McClain, Sarah E. Yoho, Rochelle B. Drill, Cassity R. Haverkamp, Sarah E. Schwartz, Brittan A. Barker, David N. Longhurst, and Shelley R. Upton
- Abstract
Classrooms are often noisy environments, which can result in unfavorable learning conditions for students. However, research has insufficiently addressed how noisy classrooms affect autistic students. This preliminary study examined differences in, and the impact of, background noise on reading performance for elementary-aged autistic and non-autistic (NA) children (N = 49). Autistic (n = 13) and NA children (n = 36) between the ages of 6 and 13 years participated in the current study. We employed a repeated measures design where each participant read four, grade-appropriate reading curriculum-based measurement (CBM) passages and subsequently completed comprehension (i.e., retell and recall) tasks in the presence of four different listening conditions (i.e., experimental condition): (1) quiet, (2) a single talker, (3) classroom noise, and (4) white noise. Using multi-level modeling (MLM), we found that listening condition differentially impacted reading fluency for all children. Children's reading fluency was more negatively impacted by the single talker in comparison to white noise and quiet. The performance of all children to retell story components (a measure of reading comprehension) was moderated by age with older children recalling more story components in the presence of white noise. Recalling story components correctly was not impacted by listening condition or disability. Regardless of disability, environments that include a single talker were not optimal for children's reading fluency skills. Moreover, preferred environments for children's reading comprehension skills--specifically the retelling of key story components--depend on student age, with background white noise being ideal for older children. Notably, no differences in how background noise impacts reading performance were found between autistic and NA children.
- Published
- 2024
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11. Linear Inverse Sandwich Complexes of Tetraanionic Benzene Stabilized by Covalent δ-Bonding with Late Lanthanides.
- Author
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McClain, K, Vincent, Alexandre, Rajabi, Ahmadreza, Ngo, Danh, Meihaus, Katie, Furche, Filipp, Harvey, Benjamin, and Long, Jeffrey
- Abstract
A series of dilanthanide benzene inverse sandwich complexes of the type (CpiPr5Ln)2(μ-η6:η6-C6H6) (1-Ln) (Ln = Y, Gd, Tb, Dy, Tm) are reported. These compounds are synthesized by reduction of the respective trivalent dimers CpiPr52Ln2I4 (Ln = Y, Gd, Tb, Dy, Tm) in diethyl ether with potassium graphite in the presence of benzene, and they feature an unusual linear coordination geometry with a highly planar benzene bridge as verified by single-crystal X-ray diffraction. The Ln-Bzcentroid distances of 1-Ln are the shortest distances observed to date, ranging from 1.943(1) Å for 1-Tm to 2.039(6) Å for 1-Gd. Structural, spectroscopic, and magnetic analyses together with density functional theory calculations support the presence of a rare, unsubstituted tetraanionic benzene in each compound, which is stabilized by strong covalent δ bonding interactions involving the filled π* orbitals of (C6H6)4- and vacant dxy and dx2-y2 orbitals of the Ln3+ ions. Notably, 1-Ln are the first examples of compounds of the later lanthanides to feature an unsubstituted tetraanionic benzene.
- Published
- 2024
12. Distinct pathways for evolution of enhanced receptor binding and cell entry in SARS-like bat coronaviruses.
- Author
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Tse, Alexandra, Acreman, Cory, Ricardo-Lax, Inna, Berrigan, Jacob, Lasso, Gorka, Balogun, Toheeb, Kearns, Fiona, Casalino, Lorenzo, McClain, Georgia, Chandran, Amartya, Lemeunier, Charlotte, Amaro, Rommie, Rice, Charles, Jangra, Rohit, McLellan, Jason, Chandran, Kartik, and Miller, Emily
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Animals ,Chiroptera ,Virus Internalization ,Spike Glycoprotein ,Coronavirus ,Humans ,Angiotensin-Converting Enzyme 2 ,Receptors ,Virus ,Severe acute respiratory syndrome-related coronavirus ,SARS-CoV-2 ,HEK293 Cells ,Coronavirus Infections - Abstract
Understanding the zoonotic risks posed by bat coronaviruses (CoVs) is critical for pandemic preparedness. Herein, we generated recombinant vesicular stomatitis viruses (rVSVs) bearing spikes from divergent bat CoVs to investigate their cell entry mechanisms. Unexpectedly, the successful recovery of rVSVs bearing the spike from SHC014-CoV, a SARS-like bat CoV, was associated with the acquisition of a novel substitution in the S2 fusion peptide-proximal region (FPPR). This substitution enhanced viral entry in both VSV and coronavirus contexts by increasing the availability of the spike receptor-binding domain to recognize its cellular receptor, ACE2. A second substitution in the S1 N-terminal domain, uncovered through the rescue and serial passage of a virus bearing the FPPR substitution, further enhanced spike:ACE2 interaction and viral entry. Our findings identify genetic pathways for adaptation by bat CoVs during spillover and host-to-host transmission, fitness trade-offs inherent to these pathways, and potential Achilles heels that could be targeted with countermeasures.
- Published
- 2024
13. Where is the Supervirial hot gas? I: A pilot study with sightlines to Galactic X-ray binaries
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Lara-DI, Armando, Krongold, Yair, Mathur, Smita, Roy, Manami, McClain, Rebecca L., Das, Sanskriti, and Gupta, Anjali
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
Hot, \logT\ $\sim$ 7.5, gas was recently discovered in the Milky Way in extragalactic sightlines. In order to determine its location, here we present sightlines to Galactic X-ray binaries (XRBs) passing through the Interstellar Medium (ISM). In this pilot study we investigate absorption features of \SXVI, \SiXIV, and \NeX\ in the spectra of three XRBs, namely 4U 1735-44, 4U 1820-30, and Cyg X-2, using Chandra High Energy Transmission Grating archival observations. We do not detect any of these lines. {We determine the 2$\sigma$ upper limit for the equivalent widths of the undetected absorption lines and the column densities of the corresponding ions.} We note that the 2$\sigma$ upper limits for \SXVI\ \Ka\ and \SiXIV\ \Ka\ are an order of magnitude smaller than those previously detected in the extragalactic sightlines. Our finding suggests that if any gas at \logT\ $>7$ is present in the Galactic ISM, it is unlikely to be ubiquitous. This is an important result because it implies that \SXVI, \SiXIV\ {and \NeX\ }absorption detected in extragalactic sightlines is not from the ISM, but is likely from a hot gas phase in the extraplanar region beyond the ISM or in the extended CGM.
- Published
- 2024
14. Programmable simulations of molecules and materials with reconfigurable quantum processors
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Maskara, Nishad, Ostermann, Stefan, Shee, James, Kalinowski, Marcin, McClain Gomez, Abigail, Araiza Bravo, Rodrigo, Wang, Derek S., Krylov, Anna I., Yao, Norman Y., Head-Gordon, Martin, Lukin, Mikhail D., and Yelin, Susanne F.
- Published
- 2025
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15. Dynamical constraints on neural population activity
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Oby, Emily R., Degenhart, Alan D., Grigsby, Erinn M., Motiwala, Asma, McClain, Nicole T., Marino, Patrick J., Yu, Byron M., and Batista, Aaron P.
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- 2025
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16. Evaluating the Effects of a Teacher-Implemented Mindfulness-Based Intervention on Teacher Stress and Student Prosocial Behavior
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Phan, Mary L., Renshaw, Tyler L., Domenech Rodríguez, Melanie M., Brunson McClain, Maryellen, Ler Moo, Eh, Humphries, Austin, and Parker, Breanna
- Published
- 2025
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17. Sociodemographic Differences Impact the Perceived Importance of Social Communication and Interaction Behaviors
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Wynn, Camille J., McClain, Maryellen Brunson, Roanhorse, Tyus T., Golson, Megan E., Harris, Bryn, Bera, Jac’lyn, and Shahid, Rabbiya
- Published
- 2025
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18. Bacterial and host fucosylation maintain IgA homeostasis to limit intestinal inflammation in mice
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Lei, Chao, Luo, Chao, Xu, Zhishan, Ding, Shu, Sriwastva, Mukesh K., Dryden, Gerald, Wang, Ting, Xu, Manman, Tan, Yi, Wang, Qilong, Yang, Xiaozhong, McClain, Craig J., and Deng, Zhongbin
- Published
- 2025
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19. Open vs tubular rate of re-operation for incidental durotomies after lumbar microdiscectomies: a propensity matched analysis
- Author
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McClain, Edward, Gupta, Bhavika, Zane, Lauren, DeFelice, Joel, Woodhouse, Cody, Li, Jenna, Kramer, Dallas E, Elhamdani, Shahed, Myers, Daniel, Xu, Chen, and Yu, Alexander
- Published
- 2025
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20. Caregiver Perceptions of Social Communication and Interaction: Development and Validation of the SCIPS
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McClain, Maryellen Brunson, Golson, Megan E., Haverkamp, Cassity R., Harris, Bryn, Ficklin, Erica, Schwartz, Sarah E., and Wynn, Camille J.
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- 2025
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21. Larmor Power Limit for Cyclotron Radiation of Relativistic Particles in a Waveguide
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Buzinsky, N., Taylor, R. J., Byron, W., DeGraw, W., Dodson, B., Fertl, M., García, A., Goodson, A. P., Graner, B., Harrington, H., Hayen, L., Malavasi, L., McClain, D., Melconian, D., Müller, P., Novitski, E., Oblath, N. S., Robertson, R. G. H., Rybka, G., Savard, G., Smith, E., Stancil, D. D., Storm, D. W., Swanson, H. E., Tedeschi, J. R., VanDevender, B. A., Wietfeldt, F. E., and Young, A. R.
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Nuclear Experiment - Abstract
Cyclotron radiation emission spectroscopy (CRES) is a modern technique for high-precision energy spectroscopy, in which the energy of a charged particle in a magnetic field is measured via the frequency of the emitted cyclotron radiation. The He6-CRES collaboration aims to use CRES to probe beyond the standard model physics at the TeV scale by performing high-resolution and low-background beta-decay spectroscopy of ${}^6\textrm{He}$ and ${}^{19}\textrm{Ne}$. Having demonstrated the first observation of individual, high-energy (0.1 -- 2.5 MeV) positrons and electrons via their cyclotron radiation, the experiment provides a novel window into the radiation of relativistic charged particles in a waveguide via the time-derivative (slope) of the cyclotron radiation frequency, $\mathrm{d}f_\textrm{c}/\mathrm{d}t$. We show that analytic predictions for the total cyclotron radiation power emitted by a charged particle in circular and rectangular waveguides are approximately consistent with the Larmor formula, each scaling with the Lorentz factor of the underlying $e^\pm$ as $\gamma^4$. This hypothesis is corroborated with experimental CRES slope data., Comment: 21 pages, 5 figures
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- 2024
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22. Metal-Halide Covalency, Exchange Coupling, and Slow Magnetic Relaxation in Triangular (CpiPr5)3U3X6 (X = Cl, Br, I) Clusters.
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Lussier, Daniel, Ito, Emi, McClain, K, Smith, Patrick, Kwon, Hyunchul, Rutkauskaite, Ryte, Harvey, Benjamin, Shuh, David, and Long, Jeffrey
- Abstract
The actinide elements are attractive alternatives to transition metals or lanthanides for the design of exchange-coupled multinuclear single-molecule magnets. However, the synthesis of such compounds is challenging, as is unraveling any contributions from exchange coupling to the overall magnetism. To date, only a few actinide compounds have been shown to exhibit exchange coupling and single-molecule magnetism. Here, we report triangular uranium(III) clusters of the type (CpiPr5)3U3X (1-X; X = Cl, Br, I; CpiPr5 = pentaisopropylcyclopentadienyl), which are synthesized via reaction of the aryloxide-bridged precursor (CpiPr5)2U2(OPhtBu)4 with excess Me3SiX. Spectroscopic analysis suggests the presence of covalency in the uranium-halide interactions arising from 5f orbital participation in bonding. The dc magnetic susceptibility data reveal the presence of antiferromagnetic exchange coupling between the uranium(III) centers in these compounds, with the strength of the exchange decreasing down the halide series. Ac magnetic susceptibility data further reveal all compounds to exhibit slow magnetic relaxation under zero dc field. In 1-I, which exhibits particularly weak exchange, magnetic relaxation occurs via a Raman mechanism associated with the individual uranium(III) centers. In contrast, for 1-Br and 1-Cl, magnetic relaxation occurs via an Orbach mechanism, likely involving relaxation between ground and excited exchange-coupled states. Significantly, in the case of 1-Cl, magnetic relaxation is sufficiently slow such that open magnetic hysteresis is observed up to 2.75 K, and the compound exhibits a 100-s blocking temperature of 2.4 K. This compound provides the first example of magnetic blocking in a compound containing only actinide-based ions, as well as the first example involving the uranium(III) oxidation state.
- Published
- 2024
23. Coercive Fields Exceeding 30 T in the Mixed-Valence Single-Molecule Magnet (CpiPr5)2Ho2I3.
- Author
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Kwon, Hyunchul, McClain, K, Kragskow, Jon, Staab, Jakob, Ozerov, Mykhaylo, Meihaus, Katie, Harvey, Benjamin, Choi, Eun, Chilton, Nicholas, and Long, Jeffrey
- Abstract
Mixed-valence dilanthanide complexes of the type (CpiPr5)2Ln2I3 (CpiPr5 = pentaisopropylcyclopentadienyl; Ln = Gd, Tb, Dy) featuring a direct Ln-Ln σ-bonding interaction have been shown to exhibit well-isolated high-spin ground states and, in the case of the Tb and Dy variants, a strong axial magnetic anisotropy that gives rise to a large magnetic coercivity. Here, we report the synthesis and characterization of two new mixed-valence dilanthanide compounds in this series, (CpiPr5)2Ln2I3 (1-Ln; Ln = Ho, Er). Both compounds feature a Ln-Ln bonding interaction, the first such interaction in any molecular compounds of Ho or Er. Like the Tb and Dy congeners, both complexes exhibit high-spin ground states arising from strong spin-spin coupling between the lanthanide 4f electrons and a single σ-type lanthanide-lanthanide bonding electron. Beyond these similarities, however, the magnetic properties of the two compounds diverge. In particular, 1-Er does not exhibit observable magnetic blocking or slow magnetic relaxation, while 1-Ho exhibits magnetic blocking below 28 K, which is the highest temperature among Ho-based single-molecule magnets, and a spin reversal barrier of 556(4) cm-1. Additionally, variable-field magnetization data collected for 1-Ho reveal a coercive field of greater than 32 T below 8 K, more than 6-fold higher than observed for the bulk magnets SmCo5 and Nd2Fe14B, and the highest coercive field reported to date for any single-molecule magnet or molecule-based magnetic material. Multiconfigurational calculations, supported by far-infrared magnetospectroscopy data, reveal that the stark differences in magnetic properties of 1-Ho and 1-Er arise from differences in the local magnetic anisotropy of the lanthanide centers.
- Published
- 2024
24. The discovery of a catalytic RNA within RNase P and its legacy.
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Kirsebom, Leif, Liu, Fenyong, and McClain, William
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RNA biology ,RNA structure ,RNA world ,RNase P ,RNase P and application ,RNase P and metal ions ,RNase P processing ,catalytic RNA ,Ribonuclease P ,History ,20th Century ,RNA ,Catalytic ,History ,21st Century ,Humans - Abstract
Sidney Altmans discovery of the processing of one RNA by another RNA that acts like an enzyme was revolutionary in biology and the basis for his sharing the 1989 Nobel Prize in Chemistry with Thomas Cech. These breakthrough findings support the key role of RNA in molecular evolution, where replicating RNAs (and similar chemical derivatives) either with or without peptides functioned in protocells during the early stages of life on Earth, an era referred to as the RNA world. Here, we cover the historical background highlighting the work of Altman and his colleagues and the subsequent efforts of other researchers to understand the biological function of RNase P and its catalytic RNA subunit and to employ it as a tool to downregulate gene expression. We primarily discuss bacterial RNase P-related studies but acknowledge that many groups have significantly contributed to our understanding of archaeal and eukaryotic RNase P, as reviewed in this special issue and elsewhere.
- Published
- 2024
25. Embracing a Perspective with the Dark Side: Using Second Wave Positive Psychology to Navigate Emotions throughout Transformative Learning
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Adam L. McClain
- Abstract
While transformative learning often leads to positive experiences, it can also be a complex, emotionally turbulent process. The process for some can represent a messy and emotionally chaotic journey, where learners may find themselves in conflict with their emotional comfort zones as they question belief systems, who they are, how they see the world, interpret what happens to them, and consider multiple points of view to verify one's truth and reality. This autoethnographic study focuses on a doctoral student's interactions with varied cognitive, sociocultural, and emotional challenges throughout their educational and personal experiences. This study integrates Transformative Learning Theory with Ivtzan et al.'s (2016) second wave "dark side" positive psychology, introducing a "dark side" perspective to transformative learning. This approach aims to deepen the understanding of the entire emotional experience and offers guidance for navigating the transformative learning process.
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- 2024
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26. Recommendations toward an Antiracist Engineering: Informing an Institutional Agenda to Enhance Black Engineering Student Experiences
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Brooke Coley, Debalina Maitra, and Trevonte McClain
- Abstract
This qualitative study collected recommendations provided by Black doctoral students in engineering to explicitly inform the institutional efforts necessary to enhance their academic experiences. This process has informed what needs to be done to support Black students through their direct accounts that provided in-depth understanding of the impactful yet missing components in their engineering pursuits, and especially, at the Ph.D. level. Situated in the theories of racialized organizations, this community-based participatory action research project conducted semi-structured interviews with n = 24 Black doctoral students enrolled in engineering programs across the United States (and one abroad). Four recommendations themes emerged from our analysis: (1) a vital need for greater representation of Black scholars across roles in engineering communities; (2) capacity for awareness, acknowledgment, and accountability of/for the lived experience of Black scholars in engineering; (3) more intentional institutional efforts to support Black scholar communities and connection; and (4) a need for re-envisioning institutional policies and practices impacting Black scholars. This paper will address that which Black students identify as missing in engineering academic environments that, if addressed, could stand to drastically improve the lived experience of Black engineering students. Institutions must be proactive in their accountability for the wellness and success for all students and can start by taking heed to the recommendations of Black doctoral students, specifically.
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- 2024
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27. Reflections on the Operation and Closure of Two Confucius Institutes in the United States
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Kyong-McClain, Jeff and Lee, Joseph Tse-Hei
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- 2024
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28. Purinergic P2Y1 and P2Y12 receptors control enteric nervous system activity through neuro-glia-macrophage crosstalk
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Hendler, Blake J., McClain, Jonathon L., Zilli, Aurora, Seguella, Luisa, and Gulbransen, Brian D.
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- 2024
- Full Text
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29. Programmable Simulations of Molecules and Materials with Reconfigurable Quantum Processors
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Maskara, Nishad, Ostermann, Stefan, Shee, James, Kalinowski, Marcin, Gomez, Abigail McClain, Bravo, Rodrigo Araiza, Wang, Derek S., Krylov, Anna I., Yao, Norman Y., Head-Gordon, Martin, Lukin, Mikhail D., and Yelin, Susanne F.
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Quantum Physics ,Condensed Matter - Materials Science ,Condensed Matter - Strongly Correlated Electrons ,Physics - Atomic Physics ,Physics - Chemical Physics - Abstract
Simulations of quantum chemistry and quantum materials are believed to be among the most important potential applications of quantum information processors, but realizing practical quantum advantage for such problems is challenging. Here, we introduce a simulation framework for strongly correlated quantum systems that can be represented by model spin Hamiltonians. Our approach leverages reconfigurable qubit architectures to programmably simulate real-time dynamics and introduces an algorithm for extracting chemically relevant spectral properties via classical co-processing of quantum measurement results. We develop a digital-analog simulation toolbox for efficient Hamiltonian time evolution utilizing digital Floquet engineering and hardware-optimized multi-qubit operations to accurately realize complex spin-spin interactions, and as an example present an implementation proposal based on Rydberg atom arrays. Then, we show how detailed spectral information can be extracted from these dynamics through snapshot measurements and single-ancilla control, enabling the evaluation of excitation energies and finite-temperature susceptibilities from a single-dataset. To illustrate the approach, we show how this method can be used to compute key properties of a polynuclear transition-metal catalyst and 2D magnetic materials., Comment: 21 pages and 11 figures, plus supplementary information
- Published
- 2023
30. Distribution, sources, and fate of nitrate in groundwater in agricultural areas of Southern Alberta, Canada
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Plata, Isabel, Humez, Pauline, Wilson, Leah, Nightingale, Michael, McClain, Cynthia, and Mayer, Bernhard
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- 2025
- Full Text
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31. Prevalence of different variations of non-consented care during the childbirth process in Mexico by geographical regions: comparing ENDIREH survey data from 2016 to 2021.
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Marian, Marian, Barker, Kathryn, Reed, Elizabeth, McClain, Amanda, Lundgren, Rebecka, Hurst, Samantha, and Pérez, Ramona
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Childbirth ,Delivery ,Mexico ,Non-consented care ,Obstetric violence ,Violence against women ,Humans ,Female ,Mexico ,Pregnancy ,Adult ,Cross-Sectional Studies ,Prevalence ,Cesarean Section ,Young Adult ,Parturition ,Adolescent ,Informed Consent ,Delivery ,Obstetric ,Surveys and Questionnaires ,Sterilization ,Reproductive ,Contraception - Abstract
INTRODUCTION: Non-consented care, a form of obstetric violence involving the lack of informed consent for procedures, is a common but little-understood phenomenon in the global public health arena. The aim of this secondary analysis was to measure the prevalence and assess change over time of non-consented care during childbirth in Mexico in 2016 and 2021, as well as to examine the association of sociodemographic, pregnancy-, and childbirth-factors with this type of violence. METHODS: We measured the prevalence of non-consented care and three of its variations, forced sterilization or contraception, forced cesarean section, and forced consent on paperwork, during childbirth in Mexico for 2016 (N = 24,036) and 2021 (N = 19,322) using data from Mexicos cross-sectional National Survey on the Dynamics of Household Relationships (ENDIREH). Weighted data were stratified by geographical regions. We performed adjusted logistic regression analyses to explore associations. RESULTS: The national prevalence of non-consented care and one of its variations, pressure to get a contraceptive method, increased from 2016 to 2021. A decrease in the prevalence was observed for forced contraception or sterilization without knowledge, forcing women to sign paperwork, and non-consented cesarean sections nationally and in most regions. Women between the ages of 26 and 35 years, married, cohabiting with partner, living in urban settings, who do not identify as Indigenous, and who received prenatal services or gave birth at the Mexican Institute of Social Security (IMSS) facilities experienced a higher prevalence of non-consented care. Being 26 years of age and older, living in a rural setting, experiencing stillbirths in the last five years, having a vaginal delivery, receiving prenatal services at IMSS, or delivering at a private facility were significantly associated with higher odds of reporting non-consented care. CONCLUSION: While a decrease in most of the variations of non-consented care was found, the overall prevalence of non-consented care and, in one of its variations, pressure to get contraceptives, increased at a national and regional level. Our findings suggest the need to enforce current laws and strengthen health systems, paying special attention to the geographical regions and populations that have experienced higher reported cases of this structural problem.
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- 2024
32. Valerie McClain Interview, Jean Strauss 150W for Athletics
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McClain, Valerie
- Published
- 2024
33. Plasma Microbial Cell-Free DNA Sequencing in Immunocompromised Patients With Pneumonia: A Prospective Observational Study.
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Bergin, Stephen, Chemaly, Roy, Dadwal, Sanjeet, Hill, Joshua, Lee, Yeon, Haidar, Ghady, Luk, Alfred, Drelick, Alexander, Chin-Hong, Peter, Benamu, Esther, Khawaja, Fareed, Nanayakkara, Deepa, Papanicolaou, Genovefa, Small, Catherine, Barron, Michelle, Davis, Thomas, McClain, Micah, Maziarz, Eileen, Madut, Deng, Bedoya, Armando, Gilstrap, Daniel, Todd, Jamie, Barkauskas, Christina, Bigelow, Robert, Leimberger, Jeffrey, Tsalik, Ephraim, Wolf, Olivia, Mughar, Mona, Hollemon, Desiree, Duttagupta, Radha, Lupu, Daniel, Bercovici, Sivan, Perkins, Bradley, Blauwkamp, Timothy, Fowler, Vance, Holland, Thomas, and Fung, Monica
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bronchoscopy ,hematologic malignancy ,hematopoietic cell transplant ,immunocompromised pneumonia ,microbial cell-free DNA sequencing ,Adult ,Humans ,Prospective Studies ,Pneumonia ,Sequence Analysis ,DNA ,Immunocompromised Host - Abstract
BACKGROUND: Pneumonia is a common cause of morbidity and mortality, yet a causative pathogen is identified in a minority of cases. Plasma microbial cell-free DNA sequencing may improve diagnostic yield in immunocompromised patients with pneumonia. METHODS: In this prospective, multicenter, observational study of immunocompromised adults undergoing bronchoscopy to establish a pneumonia etiology, plasma microbial cell-free DNA sequencing was compared to standardized usual care testing. Pneumonia etiology was adjudicated by a blinded independent committee. The primary outcome, additive diagnostic value, was assessed in the Per Protocol population (patients with complete testing results and no major protocol deviations) and defined as the percent of patients with an etiology of pneumonia exclusively identified by plasma microbial cell-free DNA sequencing. Clinical additive diagnostic value was assessed in the Per Protocol subgroup with negative usual care testing. RESULTS: Of 257 patients, 173 met Per Protocol criteria. A pneumonia etiology was identified by usual care in 52/173 (30.1%), plasma microbial cell-free DNA sequencing in 49/173 (28.3%) and the combination of both in 73/173 (42.2%) patients. Plasma microbial cell-free DNA sequencing exclusively identified an etiology of pneumonia in 21/173 patients (additive diagnostic value 12.1%, 95% confidence interval [CI], 7.7% to 18.0%, P < .001). In the Per Protocol subgroup with negative usual care testing, plasma microbial cell-free DNA sequencing identified a pneumonia etiology in 21/121 patients (clinical additive diagnostic value 17.4%, 95% CI, 11.1% to 25.3%). CONCLUSIONS: Non-invasive plasma microbial cell-free DNA sequencing significantly increased diagnostic yield in immunocompromised patients with pneumonia undergoing bronchoscopy and extensive microbiologic and molecular testing. CLINICAL TRIALS REGISTRATION: NCT04047719.
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- 2024
34. Steroid responsiveness in alcohol-associated hepatitis is linked to glucocorticoid metabolism, mitochondrial repair, and heat shock proteins.
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Hardesty, Josiah, Hawthorne, Meghan, Day, Le, Warner, Jeffrey, Warner, Dennis, Gritsenko, Marina, Asghar, Aliya, Stolz, Andrew, Morgan, Timothy, McClain, Craig, Jacobs, Jon, and Kirpich, Irina
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Humans ,Heat-Shock Proteins ,Glucocorticoids ,Proteomics ,Steroids ,Hepatitis ,Alcoholic ,Liver Diseases ,Alcoholic - Abstract
BACKGROUND: Alcohol-associated hepatitis (AH) is one of the clinical presentations of alcohol-associated liver disease. AH has poor prognosis, and corticosteroids remain the mainstay of drug therapy. However, ~40% of patients do not respond to this treatment, and the mechanisms underlying the altered response to corticosteroids are not understood. The current study aimed to identify changes in hepatic protein expression associated with responsiveness to corticosteroids and prognosis in patients with AH. METHODS: Patients with AH were enrolled based on the National Institute on Alcohol Abuse and Alcoholism inclusion criteria for acute AH and further confirmed by a diagnostic liver biopsy. Proteomic analysis was conducted on liver samples acquired from patients with AH grouped as nonresponders (AH-NR, n = 7) and responders (AH-R, n = 14) to corticosteroids, and nonalcohol-associated liver disease controls (n = 10). The definition of responders was based on the clinical prognostic model, the Lille Score, where a score < 0.45 classified patients as AH-R and a score > 0.45 as AH-NR. Primary outcomes used to assess steroid response were Lille Score (eg, improved liver function) and survival at 24 weeks. RESULTS: Reduced levels of the glucocorticoid receptor and its transcriptional co-activator, glucocorticoid modulatory element-binding protein 2, were observed in the hepatic proteome of AH-NR versus AH-R. The corticosteroid metabolizing enzyme, 11-beta-hydroxysteroid dehydrogenase 1, was increased in AH-NR versus AH-R along with elevated mitochondrial DNA repair enzymes, while several proteins of the heat shock pathway were reduced. Analysis of differentially expressed proteins in AH-NR who survived 24 weeks relative to AH-NR nonsurvivors revealed several protein expression changes, including increased levels of acute phase proteins, elevated coagulation factors, and reduced mast cell markers. CONCLUSIONS: This study identified hepatic proteomic changes that may predict responsiveness to corticosteroids and mortality in patients with AH.
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- 2024
35. Functional architecture of intracellular oscillations in hippocampal dendrites
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Liao, Zhenrui, Gonzalez, Kevin C., Li, Deborah M., Yang, Catalina M., Holder, Donald, McClain, Natalie E., Zhang, Guofeng, Evans, Stephen W., Chavarha, Mariya, Simko, Jane, Makinson, Christopher D., Lin, Michael Z., Losonczy, Attila, and Negrean, Adrian
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- 2024
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36. Adult microglial TGFβ1 is required for microglia homeostasis via an autocrine mechanism to maintain cognitive function in mice
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Bedolla, Alicia, Wegman, Elliot, Weed, Max, Stevens, Messiyah K., Ware, Kierra, Paranjpe, Aditi, Alkhimovitch, Anastasia, Ifergan, Igal, Taranov, Aleksandr, Peter, Joshua D., Gonzalez, Rosa Maria Salazar, Robinson, J. Elliott, McClain, Lucas, Roskin, Krishna M., Greig, Nigel H., and Luo, Yu
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- 2024
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37. Bone marrow stromal cell-derived hepcidin has antimicrobial and immunomodulatory activities
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Krepuska, Miklós, Mayer, Balázs, Vitale-Cross, Lynn, Myneni, Vamsee D., Boyajian, Michael K., Németh, Krisztián, Szalayova, Ildikó, Cho, Ted, McClain-Caldwell, Ian, Gingerich, Aaron D., Han, Huiling, Westerman, Mark, Rada, Balázs, and Mezey, Éva
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- 2024
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38. No Pity Invites: Information Ecological Approach to Including Disabled Adult Learners in Higher Education
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Kevin J. Mallary and Adam L. McClain
- Abstract
As adult learners with disabilities increasingly participate in higher education, adult educators must adapt their instructional practices and learning environments to meet all learners' needs. Information Ecology Theory studies how social structures such as higher education institutions serve students with disabilities. The theory explores how people, practices, values, and technologies within an institution can strengthen teaching and learning. This paper aims to illustrate how Information Ecology Theory can assist adult educators in developing accessible and inclusive courses for adult learners. Specifically, we will discuss how adult educators, disability support services, instructional designers, and information technologists can partner to serve all adult learners. [For the full proceedings, see ED648717.]
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- 2023
39. Oppositional Gaze: Disrupting the Controlling Images of Black Women's Development in Film
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Josie L. Andrews and Adam L. McClain
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As a pedagogical tool, film can help adult learners understand diverse narratives and disrupt ideology domination, specifically regarding Black women. Despite the increase in visibility in Hollywood, Black women remain negatively depicted in films. The negative depictions often minimize or simply ignore the development or self-actualization of their characters. The purpose was to examine the depictions and adult development of Black women's characters in American films. Based on our oppositional gaze of 12 Black female-led American films, four themes emerged: #noBlackgirlmagic, the transition from object-to-subject, the lies you tell, and hair it is. Practical implications for educators across the adult and higher education landscapes are discussed. [For the full proceedings, see ED648717.]
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- 2023
40. American Association for Adult and Continuing Education (AAACE) 2023 Conference Proceedings (4th, Lexington, Kentucky, October 3-6, 2023)
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American Association for Adult and Continuing Education (AAACE), Lisa R. Brown, Audrey Ayers, Trenton Ferro, Laura B. Holyoke, Adam L. McClain, and Pamela McCray
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This year's conference theme, "Informing, Reforming, and Transforming: The Vital Role of Adult Education in Challenging Times," challenged conference leaders to examine adult education from a different lens and consider new opportunities for research and practice that support the American Association for Adult and Continuing Education's (AAACE) motto of "transforming lives and communities." The proceedings reflect a combination of presentations featuring empirical research and practical application within the field of adult and continuing education. The proceedings is comprised of 24 papers that were presented at the fourth conference of the AAACE in Lexington, Kentucky, October 3-6, 2023. [Individual papers are indexed in ERIC.]
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- 2023
41. Empowering Youth in Food Security: A Case Study of a Youth-Led Food Pantry in Baltimore
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Harper, Kaitlyn, Tynes, Ka'Mya, and McClain, Don
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- 2024
- Full Text
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42. AI to the rescue: how to enhance disaster early warnings with tech tools
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Kuglitsch, Monique M., Cox, Jon, Luterbacher, Jürg, Jamoussi, Bilel, Xoplaki, Elena, Thummarukudy, Muralee, Radwan, Golestan Sally, Yasukawa, Soichiro, McClain, Shanna N., Albayrak, Rustem Arif, Oehmen, David, and Ward, Thomas
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- 2024
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43. Super-virial Hot Phase in Milky Way Circumgalactic Medium: Further Evidences
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McClain, Rebecca, Mathur, Smita, Das, Sanskriti, Krongold, Yair, and Gupta, Anjali
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Astrophysics - Astrophysics of Galaxies - Abstract
Recent discoveries of a super-virial hot phase of the Milky Way circumgalactic medium (CGM) has launched new questions regarding the multi-phase structure of the CGM around the Galaxy. We use 1.05 Ms of archival Chandra/HETG observations to characterize highly ionized metal absorption at z=0 along the line of sight of the quasar NGC 3783. We detect two distinct temperature phases with T$_1 = 5.83^{+0.15}_{-0.07}$ K, warm-hot virial temperature, and T$_2=6.61^{+0.12}_{-0.06}$ K, hot super-virial temperature. The super-virial hot phase coexisting with the warm-hot virial phase has been detected in absorption along only two other sightlines and in one stacking analysis. There is scatter in temperature of the hot as well as warm-hot gas. Similar to previous observations, we detect super-solar abundance ratios of metals in the hot phase, with a Ne/O ratio 2$\sigma$ above solar mixtures. These new detections continue the mystery of the mechanism behind the super-virial hot phase, but provide evidence that this is a true property of the CGM rather than an isolated observation. The super-virial CGM could hold the key to understanding the physical and chemical history of the Milky Way., Comment: 10 pages, 6 figures, 3 tables, accepted for publication in MNRAS
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- 2023
44. Near-Term Distributed Quantum Computation using Mean-Field Corrections and Auxiliary Qubits
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Gomez, Abigail McClain, Patti, Taylor L., Anandkumar, Anima, and Yelin, Susanne F.
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Quantum Physics - Abstract
Distributed quantum computation is often proposed to increase the scalability of quantum hardware, as it reduces cooperative noise and requisite connectivity by sharing quantum information between distant quantum devices. However, such exchange of quantum information itself poses unique engineering challenges, requiring high gate fidelity and costly non-local operations. To mitigate this, we propose near-term distributed quantum computing, focusing on approximate approaches that involve limited information transfer and conservative entanglement production. We first devise an approximate distributed computing scheme for the time evolution of quantum systems split across any combination of classical and quantum devices. Our procedure harnesses mean-field corrections and auxiliary qubits to link two or more devices classically, optimally encoding the auxiliary qubits to both minimize short-time evolution error and extend the approximate scheme's performance to longer evolution times. We then expand the scheme to include limited quantum information transfer through selective qubit shuffling or teleportation, broadening our method's applicability and boosting its performance. Finally, we build upon these concepts to produce an approximate circuit-cutting technique for the fragmented pre-training of variational quantum algorithms. To characterize our technique, we introduce a non-linear perturbation theory that discerns the critical role of our mean-field corrections in optimization and may be suitable for analyzing other non-linear quantum techniques. This fragmented pre-training is remarkably successful, reducing algorithmic error by orders of magnitude while requiring fewer iterations.
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- 2023
45. Hepatic Transcriptome and Its Regulation Following Soluble Epoxide Hydrolase Inhibition in Alcohol-Associated Liver Disease
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Warner, Jeffrey B, Hardesty, Josiah E, Song, Ying L, Floyd, Alison T, Deng, Zhongbin, Jebet, Audriy, He, Liqing, Zhang, Xiang, McClain, Craig J, Hammock, Bruce D, Warner, Dennis R, and Kirpich, Irina A
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Medical Biochemistry and Metabolomics ,Biomedical and Clinical Sciences ,Digestive Diseases ,Liver Disease ,Alcoholism ,Alcohol Use and Health ,Nutrition ,Substance Misuse ,Chronic Liver Disease and Cirrhosis ,Genetics ,2.1 Biological and endogenous factors ,Oral and gastrointestinal ,Good Health and Well Being ,Mice ,Animals ,Male ,Epoxide Hydrolases ,Chemical and Drug Induced Liver Injury ,Chronic ,Transcriptome ,Mice ,Inbred C57BL ,Liver Diseases ,Alcoholic ,Fatty Acids ,Ethanol ,RNA ,Medical and Health Sciences ,Pathology ,Biomedical and clinical sciences ,Health sciences - Abstract
Alcohol-associated liver disease (ALD) is a serious public health problem with limited pharmacologic options. The goal of the current study was to investigate the efficacy of pharmacologic inhibition of soluble epoxide hydrolase (sEH), an enzyme involved in lipid metabolism, in experimental ALD, and to examine the underlying mechanisms. C57BL/6J male mice were subjected to acute-on-chronic ethanol (EtOH) feeding with or without the sEH inhibitor 4-[[trans-4-[[[[4-trifluoromethoxy phenyl]amino]carbonyl]-amino]cyclohexyl]oxy]-benzoic acid (TUCB). Liver injury was assessed by multiple end points. Liver epoxy fatty acids and dihydroxy fatty acids were measured by targeted metabolomics. Whole-liver RNA sequencing was performed, and free modified RNA bases were measured by mass spectrometry. EtOH-induced liver injury was ameliorated by TUCB treatment as evidenced by reduced plasma alanine aminotransferase levels and was associated with attenuated alcohol-induced endoplasmic reticulum stress, reduced neutrophil infiltration, and increased numbers of hepatic M2 macrophages. TUCB altered liver epoxy and dihydroxy fatty acids and led to a unique hepatic transcriptional profile characterized by decreased expression of genes involved in apoptosis, inflammation, fibrosis, and carcinogenesis. Several modified RNA bases were robustly changed by TUCB, including N6-methyladenosine and 2-methylthio-N6-threonylcarbamoyladenosine. These findings show the beneficial effects of sEH inhibition by TUCB in experimental EtOH-induced liver injury, warranting further mechanistic studies to explore the underlying mechanisms, and highlighting the translational potential of sEH as a drug target for this disease.
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- 2024
46. Hepatic Proteomic Changes Associated with Liver Injury Caused by Alcohol Consumption in Fpr2−/− Mice
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Hardesty, Josiah E, Warner, Jeffrey B, Wilkey, Daniel W, Phinney, Brett S, Salemi, Michelle R, Merchant, Michael L, McClain, Craig J, Warner, Dennis R, and Kirpich, Irina A
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Biochemistry and Cell Biology ,Biological Sciences ,Medicinal and Biomolecular Chemistry ,Chemical Sciences ,Microbiology ,Digestive Diseases ,Alcoholism ,Alcohol Use and Health ,Hepatitis ,Biotechnology ,Chronic Liver Disease and Cirrhosis ,Liver Disease ,Substance Misuse ,2.1 Biological and endogenous factors ,Oral and gastrointestinal ,Good Health and Well Being ,Animals ,Receptors ,Formyl Peptide ,Mice ,Liver ,Proteomics ,Humans ,Mice ,Knockout ,Male ,Disease Models ,Animal ,Alcohol Drinking ,Mice ,Inbred C57BL ,Proteome ,Liver Diseases ,Alcoholic ,alcohol-associated liver disease ,FPR2 ,liver proteome ,Other Chemical Sciences ,Genetics ,Other Biological Sciences ,Chemical Physics ,Biochemistry and cell biology ,Medicinal and biomolecular chemistry - Abstract
Alcohol-associated liver disease (ALD) is a prevalent medical problem with limited effective treatment strategies. Although many biological processes contributing to ALD have been elucidated, a complete understanding of the underlying mechanisms is still lacking. The current study employed a proteomic approach to identify hepatic changes resulting from ethanol (EtOH) consumption and the genetic ablation of the formyl peptide receptor 2 (FPR2), a G-protein coupled receptor known to regulate multiple signaling pathways and biological processes, in a mouse model of ALD. Since previous research from our team demonstrated a notable reduction in hepatic FPR2 protein levels in patients with alcohol-associated hepatitis (AH), the proteomic changes in the livers of Fpr2-/- EtOH mice were compared to those observed in patients with AH in order to identify common hepatic proteomic alterations. Several pathways linked to exacerbated ALD in Fpr2-/- EtOH mice, as well as hepatic protein changes resembling those found in patients suffering from AH, were identified. These alterations included decreased levels of coagulation factors F2 and F9, as well as reduced hepatic levels of glutamate-cysteine ligase catalytic subunit (GCLC) and total glutathione in Fpr2-/- EtOH compared to WT EtOH mice. In conclusion, the data suggest that FPR2 may play a regulatory role in hepatic blood coagulation and the antioxidant system, both in a pre-clinical model of ALD and in human AH, however further experiments are required to validate these findings.
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- 2024
47. Erythema multiforme-like papules after COVID vaccine administration
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Daly, Theodore J, Smith, Gregory T, and McClain, Steve A
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COVID-19 ,interface dermatitis ,micro-vesiculation ,purpuric ,vaccine reaction - Abstract
A unique dermatopathology incident arose after administration of the mRNA-1273 SARS-CoV-2 (Moderna) vaccine. Specifically, a transient purpuric interface dermatitis occurred 5 days post-second vaccine with the presentation of erythematous papules with erythema multiforme-type findings. A patient developed purpuric interface dermatitis with micro-vesiculation post-vaccination which ultimately resolved without sequelae.
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- 2024
48. In vivo photopharmacology with light-activated opioid drugs.
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McClain, Shannan, Ma, Xiang, Johnson, Desiree, Johnson, Caroline, Layden, Aryanna, Yung, Jean, Lubejko, Susan, Livrizzi, Giulia, He, X, Zhou, Jingjing, Chang-Weinberg, Janie, Ventriglia, Emilya, Rizzo, Arianna, Levinstein, Marjorie, Gomez, Juan, Bonaventura, Jordi, Michaelides, Michael, and Banghart, Matthew
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addiction ,analgesia ,behavioral pharmacology ,dopamine ,opioid ,optical recording ,pain ,photoactivation ,photopharmacology ,reward ,Analgesics ,Opioid ,Oxymorphone ,Pharmaceutical Preparations ,Dopamine ,Naloxone ,Receptors ,Opioid ,mu - Abstract
Traditional methods for site-specific drug delivery in the brain are slow, invasive, and difficult to interface with recordings of neural activity. Here, we demonstrate the feasibility and experimental advantages of in vivo photopharmacology using caged opioid drugs that are activated in the brain with light after systemic administration in an inactive form. To enable bidirectional manipulations of endogenous opioid receptors in vivo, we developed photoactivatable oxymorphone (PhOX) and photoactivatable naloxone (PhNX), photoactivatable variants of the mu opioid receptor agonist oxymorphone and the antagonist naloxone. Photoactivation of PhOX in multiple brain areas produced local changes in receptor occupancy, brain metabolic activity, neuronal calcium activity, neurochemical signaling, and multiple pain- and reward-related behaviors. Combining PhOX photoactivation with optical recording of extracellular dopamine revealed adaptations in the opioid sensitivity of mesolimbic dopamine circuitry in response to chronic morphine administration. This work establishes a general experimental framework for using in vivo photopharmacology to study the neural basis of drug action.
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- 2023
49. Mu Opioid Receptor-Expressing Neurons in the Dorsal Raphe Nucleus Are Involved in Reward Processing and Affective Behaviors.
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Welsch, Lola, Colantonio, Esther, Frison, Mathilde, Johnson, Desiree, McClain, Shannan, Mathis, Victor, Ben Hamida, Sami, Darcq, Emmanuel, Kieffer, Brigitte, and Banghart, Matthew
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Dorsal raphe nucleus ,Fiber photometry ,Mouse behavior ,Opioid circuitry ,Optogenetics ,Positive affect ,Dorsal Raphe Nucleus ,Receptors ,Opioid ,mu ,Neurons ,Morphine ,Analgesics ,Opioid ,Reward - Abstract
BACKGROUND: Mu opioid receptors (MORs) are key for reward processing, mostly studied in dopaminergic pathways. MORs are also expressed in the dorsal raphe nucleus (DRN), which is central for the modulation of reward and mood, but MOR function in the DRN remains underexplored. Here, we investigated whether MOR-expressing neurons of the DRN (DRN-MOR neurons) participate in reward and emotional responses. METHODS: We characterized DRN-MOR neurons anatomically using immunohistochemistry and functionally using fiber photometry in responses to morphine and rewarding/aversive stimuli. We tested the effect of opioid uncaging on the DRN on place conditioning. We examined the effect of DRN-MOR neuron optostimulation on positive reinforcement and mood-related behaviors. We mapped their projections and selected DRN-MOR neurons projecting to the lateral hypothalamus for a similar optogenetic experimentation. RESULTS: DRN-MOR neurons form a heterogeneous neuronal population essentially composed of GABAergic (gamma-aminobutyric acidergic) and glutamatergic neurons. Calcium activity of DRN-MOR neurons was inhibited by rewarding stimuli and morphine. Local photo-uncaging of oxymorphone in the DRN produced conditioned place preference. DRN-MOR neuron optostimulation triggered real-time place preference and was self-administered, promoted social preference, and reduced anxiety and passive coping. Finally, specific optostimulation of DRN-MOR neurons projecting to the lateral hypothalamus recapitulated the reinforcing effects of total DRN-MOR neuron stimulation. CONCLUSIONS: Our data show that DRN-MOR neurons respond to rewarding stimuli and that their optoactivation has reinforcing effects and promotes positive emotional responses, an activity which is partially mediated by their projections to the lateral hypothalamus. Our study also suggests a complex regulation of DRN activity by MOR opioids, involving mixed inhibition/activation mechanisms that fine-tune DRN function.
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- 2023
50. Associations between avocado intake and measures of glucose and insulin homeostasis in Hispanic individuals with and without type 2 diabetes: Results from the Hispanic Community Health Study/Study of Latinos (HCHS/SOL)
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Senn, MacKenzie K, Goodarzi, Mark O, Ramesh, Gautam, Allison, Matthew A, Graff, Mariaelisa, Young, Kristin L, Talavera, Gregory A, McClain, Amanda C, Garcia, Tanya P, Rotter, Jerome I, and Wood, Alexis C
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Medical Biochemistry and Metabolomics ,Biomedical and Clinical Sciences ,Cardiovascular Medicine and Haematology ,Nutrition and Dietetics ,Nutrition ,Minority Health ,Clinical Research ,Diabetes ,Prevention ,Metabolic and endocrine ,Adult ,Humans ,Blood Glucose ,Cross-Sectional Studies ,Diabetes Mellitus ,Type 2 ,Glucose ,Glycated Hemoglobin ,Hispanic or Latino ,Homeostasis ,Insulin ,Insulin Resistance ,Persea ,Public Health ,Diet ,Avocado ,HbA1c ,Type 2 diabetes ,Postprandial ,Insulin homeostasis ,Medical and Health Sciences ,Cardiovascular System & Hematology ,Cardiovascular medicine and haematology ,Medical biochemistry and metabolomics ,Nutrition and dietetics - Abstract
Background and aimsTo investigate associations between avocado intake and glycemia in adults with Hispanic/Latino ancestry.Methods and resultsThe associations of avocado intake with measures of insulin and glucose homeostasis were evaluated in a cross-sectional analysis of up to 14,591 Hispanic/Latino adults, using measures of: average glucose levels (hemoglobin A1c; HbA1c), fasting glucose and insulin, glucose and insulin levels after an oral glucose tolerance test (OGTT), and calculated measures of insulin resistance (HOMA-IR, and HOMA-%β), and insulinogenic index. Associations were assessed using multivariable linear regression models, which controlled for sociodemographic factors and health behaviors, and which were stratified by dysglycemia status. In those with normoglycemia, avocado intake was associated with a higher insulinogenic index (β = 0.17 ± 0.07, P = 0.02). In those with T2D (treated and untreated), avocado intake was associated with lower hemoglobin A1c (HbA1c; β = -0.36 ± 0.21, P = 0.02), and lower fasting glucose (β = -0.27 ± 0.12, P = 0.02). In the those with untreated T2D, avocado intake was additionally associated with HOMA-%β (β = 0.39 ± 0.19, P = 0.04), higher insulin values 2-h after an oral glucose load (β = 0.62 ± 0.23, P = 0.01), and a higher insulinogenic index (β = 0.42 ± 0.18, P = 0.02). No associations were observed in participants with prediabetes.ConclusionsWe observed an association of avocado intake with better glucose/insulin homeostasis, especially in those with T2D.
- Published
- 2023
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