73,486 results on '"Holman, A. A."'
Search Results
52. Using surface-enhanced Raman spectroscopy to probe artificial dye degradation on hair buried in multiple soils for up to eight weeks
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Holman, Aidan P., Peterson, Mackenzi, Linhart, Emily, and Kurouski, Dmitry
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- 2024
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53. Long-term, non-invasive FTIR detection of low-dose ionizing radiation exposure
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Inman, Jamie L., Wu, Yulun, Chen, Liang, Brydon, Ella, Ghosh, Dhruba, Wan, Kenneth H., De Chant, Jared, Obst-Huebl, Lieselotte, Nakamura, Kei, Ralston, Corie Y., Celniker, Susan E., Mao, Jian-Hua, Zwart, Peter H., Holman, Hoi-Ying N., Chang, Hang, Brown, James B., and Snijders, Antoine M.
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- 2024
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54. Species identification of adult ixodid ticks by Raman spectroscopy of their feces
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Dou, Tianyi, Holman, Aidan P., Hays, Samantha R., Donaldson, Taylor G., Goff, Nicolas, Teel, Pete D., and Kurouski, Dmitry
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- 2024
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55. A single intranasal dose of essential oil spray confers modulation of the nasopharyngeal microbiota and short-term inhibition of Mannheimia in feedlot cattle: a pilot study
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Magossi, Gabriela, Schmidt, Kaycie N., Winders, Thomas M., Carlson, Zachary E., Holman, Devin B., Underdahl, Sarah R., Swanson, Kendall C., and Amat, Samat
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- 2024
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56. Development and validation of the provider assessed quality of consultations with language interpretation scale (PQC-LI)
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Müller, Frank, Ngo, Julie, Arnetz, Judith E., and Holman, Harland T.
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- 2024
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57. Association between clinician team segregation, receipt of cardiovascular care and outcomes in valvular heart diseases
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Ikeoluwapo Kendra Bolakale‐Rufai, Shannon M. Knapp, Janina Quintero Bisono, Adedoyin Johnson, Wanda Moore, Ekow Yankah, Ryan Yee, Dalancee Trabue, Brahmajee Nallamothu, John M. Hollingsworth, Stephen Watty, Francesca Williamson, Natalie Pool, Megan Hebdon, Nneamaka Ezema, Quinn Capers, Courtland Blount, Nia Kimbrough, Denee Johnson, Jalynn Evans, Brandi Foree, Anastacia Holman, Karen Lightbourne, David Brown, Brownsyne Tucker Edmonds, and Khadijah Breathett
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cardiovascular diseases ,health equity ,quality of care ,racial disparities ,segregation index ,structural racism ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Aims Racial disparities exist in clinical outcomes for valvular heart disease (VHD). It is unknown whether clinician segregation contributes to these disparities. Among an adequately insured population, we evaluated the relationship between clinician segregation in a hospital and receipt of care by a cardiologist according to patient race. We also evaluated the association between clinician segregation, race and care by a cardiologist on 30‐day readmission and 1‐year survival. Methods and results Using Optum's Clinformatics® Data Mart Database (CDM, US commercial and Medicare beneficiaries) from 2010 to 2018, we identified patients with a primary diagnosis of VHD. Hospitals were categorized into low, medium and high segregation groups (SG), according to clinician segregation index (SI). SI can range from 0–1 (0: the ratio of Black to White patients is the same for all clinicians; 1: each clinician treats only Black or only White patients). Outcomes were analysed using generalized linear mixed effect models. Among 8649 patients [median age 75 (67–82), 45.4% female, 16.1% Black, 83.9% White], odds of care from a cardiologist did not vary across race for all SGs [Low SG adjusted odds ratio (aOR): 0.79 (95% CI: 0.58–1.08), P = 0.14; Medium SG aOR: 0.86 (95% CI: 0.60–1.25), P = 0.43; High SG aOR: 1.07 (95% CI: 0.68–1.69), P = 0.76]. Among those that received care from a cardiologist, there was no difference in the 30‐day readmission between Black and White patients across SGs [Low SG aOR: 1.05 (95% CI: 0.83–1.31), P = 0.70; Medium SG aOR: 1.22 (95% CI: 0.92–1.61), P = 0.17; High SG aOR: 0.81 (95% CI: 0.57–1.17), P = 0.27]. Among patients that did not receive care from a cardiologist, Black patients in low SG had higher odds of 30‐day readmission compared to White patients [aOR: 2.74 (95%CI:1.38–5.43), P
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- 2025
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58. Neoadjuvant or concurrent atezolizumab with chemoradiation for locally advanced cervical cancer: a randomized phase I trial
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Jyoti Mayadev, Dmitriy Zamarin, Wei Deng, Heather A. Lankes, Giulio Pesci, Hayeon Kim, Junzo P. Chino, Barbara Banbury, Ned Sherry, Elad Sharon, Sharad A. Ghamande, Catherine Ferguson, Loren Mell, Laura Holman, Cara Mathews, David O’Malley, Alexander Olawaiye, Elizabeth Hopp, Charles Leath, Larry Copeland, Robert Mannel, Roisin O’Cearbhaill, Carol Aghajanian, and Russell J. Schilder
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Science - Abstract
Abstract Combined immune checkpoint blockade (ICB) and chemoradiation (CRT) is approved in patients with locally advanced cervical cancer (LACC) but optimal sequencing of CRT and ICB is unknown. NRG-GY017 (NCT03738228) was a randomized phase I trial of atezolizumab (anti-PD-L1) neoadjuvant and concurrent with CRT (Arm A) vs. concurrent with CRT (Arm B) in patients with high-risk node-positive LACC. The primary endpoint was the fraction of expanded tumor-associated T-cell receptor (TCR) clones in blood at day 21 as a surrogate measure of anti-tumor immune response. Secondary objectives were safety and feasibility, 2-year disease-free survival (DFS), and predictive value of PD-L1 expression. Forty patients were randomized, 36 received treatment, and 25 were evaluable for the primary endpoint. After cycle 1, there was peripheral expansion of higher proportion of tumor-associated TCR clones in Arm A than in Arm B (p = 0.0025) that remained higher at day 21, meeting the pre-specified endpoint on two-sample T-test (p = 0.052), but not on sensitivity analysis by Wilcoxon test (p = 0.13). At the median follow up of 25.8 months, 2-year DFS was 76% in Arm A and 56% in Arm B (p = 0.28). There were no new safety signals. In conclusion, neoadjuvant ICB prior to CRT was safe and was associated with immunologically and clinically favorable outcomes, warranting larger confirmatory studies.
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- 2025
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59. Bridge to Finish Outcome Study
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Washington Student Achievement Council, MDRC, Henderson, Brit, Holman, Daron, and Lacalli, Emma
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Higher education offers many benefits to individuals and society--including increased employment opportunities and higher wages--and can help disrupt cycles of intergenerational poverty by improving economic outcomes for those who earn postsecondary credentials. Public community and technical colleges offer a relatively affordable, open-access option for students seeking higher education. Community colleges also provide an array of services to support students along their educational journey, and it is increasingly evident that basic needs supports should be among the services offered. Food insecurity, housing insecurity, and other basic needs insecurities are prevalent among community and technical college students in Washington. In response to these needs, United Way of King County (UWKC) launched the Bridge to Finish campaign to implement a successful basic needs delivery model, provide these services to current students, build evidence to influence policy, and contribute knowledge to the broader conversation on the benefits of a culture of care for community and technical college students. This report shares insights from the collaborative study by providing information on characteristics of Bridge to Finish participants, patterns of service receipt, and rates of successful academic outcomes. The report highlights ways to help Bridge to Finish and other similar programs prepare for a rigorous impact evaluation.
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- 2023
60. Student Engagement, Understanding, and STEM Interest in a Game Based Supplemental Fraction Curriculum
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Jessica H. Hunt, Michelle Taub, Matthew Marino, Kenneth Holman, Alejandra Duarte, and Brianna Bentley
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We analyzed the effects of a game-based, supplemental fraction curriculum on fourth and fifth grade students' fraction knowledge, engagement, and STEM interest. Students with and without disabilities with intersecting identities (e.g., race, disability status, gender) comprised the sample. Results indicate significant differences in fraction concept knowledge as a result of the curriculum for all students, but not STEM interest. Furthermore, engagement was a significant predictor of STEM post test scores, but not fraction concept post test scores. Implications of the results in the context of previous research on game-based mathematics curriculums are shared. [For the complete proceedings, see ED658295.]
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- 2023
61. Interventions for Students with Developmental Dyscalculia: A Systematic Literature Review
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Holman, Kenneth
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Developmental dyscalculia (DD) affects 2-6% of the population. Yet, a readily accessible list of potential interventions for DD is not available or can be easily found by educators. With a large percentage of the population afflicted with DD, educators should be made aware of what supportive approaches are available. The purpose of this study was to construct a literature review to locate and identify strategies tailored for this particular learning disability that can be used in the classroom. Results indicated that a total of seven evidence-based interventions are available for DD. Of the seven available options, all reported evidence of effectiveness in terms of helping to improve mathematical learning abilities for individuals. The need for future research into interventions for DD will assist students in improving their understanding of how they can handle mathematical tasks.
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- 2023
62. Validation of the inadequate delivery of oxygen index in an adult cardiovascular intensive care unitCentral MessagePerspective
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Heather Holman, BS, Dimitar Baronov, PhD, Jeff McMurray, MD, Arman Kilic, MD, Marc Katz, MD, and Sanford Zeigler, MD
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machine learning ,pulmonary artery catheterization ,artificial intelligence ,hemodynamic monitoring ,critical care ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 ,Surgery ,RD1-811 - Abstract
Objective: Machine learning (ML) may allow for improved discernment of hemodynamics and oxygen delivery compared to standard invasive monitoring. We hypothesized that an ML algorithm could predict impaired delivery of oxygen (IDO2) with comparable discrimination to invasive mixed venous oxygen saturation (SvO2) measurement. Methods: A total of 230 patients not on mechanical circulatory support (MCS) managed with a pulmonary artery catheter (PAC) were identified from 1012 patients admitted to a single cardiovascular intensive care unit (CVICU) between April 2021 and January 2022. Physiologic data were collected prospectively by the data analytics engine. Inadequate delivery of oxygen (IDO2) was defined as SvO2 ≤50%. Fifty-four patients were used to train the model, which was then validated in 176 patients. Three simulated monitoring situations were constructed by downsampling the physiologic data set to exclude all SvO2 sources (scenario A); all PAC data but allowing for SvO2 values (scenario B); and all PAC data, including SvO2 and cardiac index (CI) (scenario C). The ML platform then calculated the likelihood of IDO2 for rolling 30-minute intervals and compared these values against the gold standard SvO2 values using receiver operating characteristic (ROC) curve analysis to establish discriminatory power. Results: A total of 1047 laboratory-validated SvO2 values were collected for the validation group. The area under the ROC curve for the IDO2 index was 0.89 (95% confidence interval, 0.87-0.91) with the full data set. When blinded to all PAC and SvO2 sources, the AUC was 0.78 (95% confidence interval, 0.75-0.81). Conclusions: The IDO2 index is capable of detecting SvO2 ≤50% with good discriminatory function in non-MCS CVICU patients in a variety of monitoring situations. Further investigation of IDO2 detection and clinical endpoints is needed.
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- 2024
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63. The DECam Ecliptic Exploration Project (DEEP) II. Observational Strategy and Design
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Trujillo, Chadwick A., Fuentes, Cesar, Gerdes, David W., Markwardt, Larissa, Sheppard, Scott S., Strauss, Ryder, Chandler, Colin Orion, Oldroyd, William J., Trilling, David E., Lin, Hsing Wen, Adams, Fred C., Bernardinelli, Pedro H., Holman, Matthew J., Juric, Mario, McNeill, Andrew, Mommert, Michael, Napier, Kevin J., Payne, Matthew J., Ragozzine, Darin, Rivkin, Andrew S., Schlichting, Hilke, and Smotherman, Hayden
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
We present the DECam Ecliptic Exploration Project (DEEP) survey strategy including observing cadence for orbit determination, exposure times, field pointings and filter choices. The overall goal of the survey is to discover and characterize the orbits of a few thousand Trans-Neptunian Objects (TNOs) using the Dark Energy Camera (DECam) on the Cerro Tololo Inter-American Observatory (CTIO) Blanco 4 meter telescope. The experiment is designed to collect a very deep series of exposures totaling a few hours on sky for each of several 2.7 square degree DECam fields-of-view to achieve a magnitude of about 26.2 using a wide VR filter which encompasses both the V and R bandpasses. In the first year, several nights were combined to achieve a sky area of about 34 square degrees. In subsequent years, the fields have been re-visited to allow TNOs to be tracked for orbit determination. When complete, DEEP will be the largest survey of the outer solar system ever undertaken in terms of newly discovered object numbers, and the most prolific at producing multi-year orbital information for the population of minor planets beyond Neptune at 30 au., Comment: 29 pages, 4 figures and 4 tables
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- 2023
64. The DECam Ecliptic Exploration Project (DEEP) VI: first multi-year observations of trans-Neptunian objects
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Smotherman, Hayden, Bernardinelli, Pedro H., Portillo, Stephen K. N., Connolly, Andrew J., Kalmbach, J. Bryce, Stetzler, Steven, Juric, Mario, Bektesvic, Dino, Langford, Zachary, Adams, Fred C., Oldroyd, William J., Holman, Matthew J., Chandler, Colin Orion, Fuentes, Cesar, Gerdes, David W., Lin, Hsing Wen, Markwardt, Larissa, McNeill, Andrew, Mommert, Michael, Napier, Kevin J., Payne, Matthew J., Ragozzine, Darin, Rivkin, Andrew S., Schlichting, Hilke, Sheppard, Scott S., Strauss, Ryder, Trilling, David E., and Trujillo, Chadwick A.
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
We present the first set of trans-Neptunian objects (TNOs) observed on multiple nights in data taken from the DECam Ecliptic Exploration Project (DEEP). Of these 110 TNOs, 105 do not coincide with previously known TNOs and appear to be new discoveries. Each individual detection for our objects resulted from a digital tracking search at TNO rates of motion, using two to four hour exposure sets, and the detections were subsequently linked across multiple observing seasons. This procedure allows us to find objects with magnitudes $m_{VR} \approx 26$. The object discovery processing also included a comprehensive population of objects injected into the images, with a recovery and linking rate of at least $94\%$. The final orbits were obtained using a specialized orbit fitting procedure that accounts for the positional errors derived from the digital tracking procedure. Our results include robust orbits and magnitudes for classical TNOs with absolute magnitudes $H \sim 10$, as well as a dynamically detached object found at 76 au (semi-major axis $a\approx 77 \, \mathrm{au}$). We find a disagreement between our population of classical TNOs and the CFEPS-L7 three component model for the Kuiper belt., Comment: Accepted to AJ, companion paper do DEEP III. Objects will be released in the journal version (or contacting the authors)
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- 2023
65. The DECam Ecliptic Exploration Project (DEEP) III: Survey characterization and simulation methods
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Bernardinelli, Pedro H., Smotherman, Hayden, Langford, Zachary, Portillo, Stephen K. N., Connolly, Andrew J., Kalmbach, J. Bryce, Stetzler, Steven, Juric, Mario, Oldroyd, William J., Lin, Hsing Wen, Adams, Fred C., Chandler, Colin Orion, Fuentes, Cesar, Gerdes, David W., Holman, Matthew J., Markwardt, Larissa, McNeill, Andrew, Mommert, Michael, Napier, Kevin J., Payne, Matthew J., Ragozzine, Darin, Rivkin, Andrew S., Schlichting, Hilke, Sheppard, Scott S., Strauss, Ryder, Trilling, David E., and Trujillo, Chadwick A.
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
We present a detailed study of the observational biases of the DECam Ecliptic Exploration Project's (DEEP) B1 data release and survey simulation software that enables direct statistical comparisons between models and our data. We inject a synthetic population of objects into the images, and then subsequently recover them in the same processing as our real detections. This enables us to characterize the survey's completeness as a function of apparent magnitudes and on-sky rates of motion. We study the statistically optimal functional form for the magnitude, and develop a methodology that can estimate the magnitude and rate efficiencies for all survey's pointing groups simultaneously. We have determined that our peak completeness is on average 80\% in each pointing group, and our magnitude drops to $25\%$ of this value at $m_{25} = 26.22$. We describe the freely available survey simulation software and its methodology. We conclude by using it to infer that our effective search area for objects at 40 au is $14.8\deg^2$, and that our lack of dynamically cold distant objects means that there at most $8\times 10^3$ objects with $60 < a < 80$ au and absolute magnitudes $H \leq 8$., Comment: Accepted to AJ, companion paper to DEEP VI
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- 2023
66. The DECam Ecliptic Exploration Project (DEEP): V. The Absolute Magnitude Distribution of the Cold Classical Kuiper Belt
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Napier, Kevin J., Lin, Hsing-Wen, Gerdes, David W., Adams, Fred C., Simpson, Anna M., Porter, Matthew W., Weber, Katherine G., Markwardt, Larissa, Gowman, Gabriel, Smotherman, Hayden, Bernardinelli, Pedro H., Jurić, Mario, Connolly, Andrew J., Kalmbach, J. Bryce, Portillo, Stephen K. N., Trilling, David E., Strauss, Ryder, Oldroyd, William J., Trujillo, Chadwick A., Chandler, Colin Orion, Holman, Matthew J., Schlichting, Hilke E., McNeill, Andrew, and Collaboration, the DEEP
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Astrophysics - Earth and Planetary Astrophysics - Abstract
The DECam Ecliptic Exploration Project (DEEP) is a deep survey of the trans-Neptunian solar system being carried out on the 4-meter Blanco telescope at Cerro Tololo Inter-American Observatory in Chile using the Dark Energy Camera (DECam). By using a shift-and-stack technique to achieve a mean limiting magnitude of $r \sim 26.2$, DEEP achieves an unprecedented combination of survey area and depth, enabling quantitative leaps forward in our understanding of the Kuiper Belt populations. This work reports results from an analysis of twenty 3 sq.\ deg.\ DECam fields along the invariable plane. We characterize the efficiency and false-positive rates for our moving-object detection pipeline, and use this information to construct a Bayesian signal probability for each detected source. This procedure allows us to treat all of our Kuiper Belt Object (KBO) detections statistically, simultaneously accounting for efficiency and false positives. We detect approximately 2300 candidate sources with KBO-like motion at S/N $>6.5$. We use a subset of these objects to compute the luminosity function of the Kuiper Belt as a whole, as well as the Cold Classical (CC) population. We also investigate the absolute magnitude ($H$) distribution of the CCs, and find consistency with both an exponentially tapered power-law, which is predicted by streaming instability models of planetesimal formation, and a rolling power law. Finally, we provide an updated mass estimate for the Cold Classical Kuiper Belt of $M_{CC}(H_r < 12) = 0.0017^{+0.0010}_{-0.0004} M_{\oplus}$, assuming albedo $p = 0.15$ and density $\rho = 1$ g cm$^{-3}$., Comment: Accepted by PSJ
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- 2023
67. The DECam Ecliptic Exploration Project (DEEP) IV: Constraints on the shape distribution of bright TNOs
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Strauss, R., Trilling, D. E., Bernardinelli, P. H., Beach, C., Oldroyd, W. J., Sheppard, S. S., Schlichting, H. E., Gerdes, D. W., Adams, F. C., Chandler, C. O., Fuentes, C., Holman, M. J., Jurić, M., Lin, H. W., Markwardt, L., McNeill, A., Mommert, M., Napier, K. J., Payne, M. J., Ragozzine, D., Rivkin, A. S., Smotherman, H., and Trujillo, C. A.
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Astrophysics - Earth and Planetary Astrophysics - Abstract
We present the methods and results from the discovery and photometric measurement of 26 bright (VR $>$ 24 trans-Neptunian objects (TNOs) during the first year (2019-20) of the DECam Ecliptic Exploration Project (DEEP). The DEEP survey is an observational TNO survey with wide sky coverage, high sensitivity, and a fast photometric cadence. We apply a computer vision technique known as a progressive probabilistic Hough transform to identify linearly-moving transient sources within DEEP photometric catalogs. After subsequent visual vetting, we provide a photometric and astrometric catalog of our TNOs. By modeling the partial lightcurve amplitude distribution of the DEEP TNOs using Monte Carlo techniques, we find our data to be most consistent with an average TNO axis ratio b/a $<$ 0.5, implying a population dominated by non-spherical objects. Based on ellipsoidal gravitational stability arguments, we find our data to be consistent with a TNO population containing a high fraction of contact binaries or other extremely non-spherical objects. We also discuss our data as evidence that the expected binarity fraction of TNOs may be size-dependent.
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- 2023
68. The DECam Ecliptic Exploration Project (DEEP): I. Survey description, science questions, and technical demonstration
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Trilling, David E., Gerdes, David W., Juric, Mario, Trujillo, Chadwick A., Bernardinelli, Pedro H., Napier, Kevin J., Smotherman, Hayden, Strauss, Ryder, Fuentes, Cesar, Holman, Matthew J., Lin, Hsing Wen, Markwardt, Larissa, McNeill, Andrew, Mommert, Michael, Oldroyd, William J., Payne, Matthew J., Ragozzine, Darin, Rivkin, Andrew S., Schlichting, Hilke, Sheppard, Scott S., Adams, Fred C., and Chandler, Colin Orion
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
We present here the DECam Ecliptic Exploration Project (DEEP), a three year NOAO/NOIRLab Survey that was allocated 46.5 nights to discover and measure the properties of thousands of trans-Neptunian objects (TNOs) to magnitudes as faint as VR~27, corresponding to sizes as small as 20 km diameter. In this paper we present the science goals of this project, the experimental design of our survey, and a technical demonstration of our approach. The core of our project is "digital tracking," in which all collected images are combined at a range of motion vectors to detect unknown TNOs that are fainter than the single exposure depth of VR~23 mag. Through this approach we reach a depth that is approximately 2.5 magnitudes fainter than the standard LSST "wide fast deep" nominal survey depth of 24.5 mag. DEEP will more than double the number of known TNOs with observational arcs of 24 hours or more, and increase by a factor of 10 or more the number of known small (<50 km) TNOs. We also describe our ancillary science goals, including measuring the mean shape distribution of very small main belt asteroids, and briefly outline a set of forthcoming papers that present further aspects of and preliminary results from the DEEP program., Comment: AJ, in press. First in a series of papers
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- 2023
69. Polytopic fractional delivery of an HIV vaccine alters cellular responses and results in increased epitope breadth in a phase 1 randomized trial
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Miner, Maurine D, deCamp, Allan, Grunenberg, Nicole, De Rosa, Stephen C, Fiore-Gartland, Andrew, Bar, Katherine, Spearman, Paul, Allen, Mary, Yu, Pei-Chun, Manso, Bryce, Frahm, Nicole, Kalams, Spyros, Baden, Lindsey, Keefer, Michael C, Scott, Hyman M, Novak, Richard, Van Tieu, Hong, Tomaras, Georgia D, Kublin, James G, McElrath, M Juliana, Corey, Lawrence, Frank, Ian, Team, HVTN 085 Study, Kalichman, Artur, Edlefsen, Paul, Enama, Mary, Hural, John, Holt, Renee, Dunbar, Debora, Crawford, Dave, Maki, Ian, Johannessen, Jan, Estep, Scharla, Grigoriev, Yevgeny, Madenwald, Tamra, Hansen, Marianne, Holman, Drienna, Fair, Ramey, Meyer, Genevieve, and Luke-Kilolam, Anya
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Medical Microbiology ,Biomedical and Clinical Sciences ,Immunology ,Vaccine Related ,Biotechnology ,Infectious Diseases ,Sexually Transmitted Infections ,Immunization ,Clinical Trials and Supportive Activities ,Prevention ,Clinical Research ,HIV/AIDS ,Vaccine Related (AIDS) ,3.4 Vaccines ,Infection ,Good Health and Well Being ,Humans ,AIDS Vaccines ,Epitopes ,HIV Infections ,CD4-Positive T-Lymphocytes ,Vaccination ,Immunoglobulin G ,HIV ,Fractionated delivery ,Polytopic vaccination ,Ad5 ,Epitope breadth ,HVTN 085 Study Team ,Clinical Sciences ,Public Health and Health Services ,Clinical sciences ,Epidemiology - Abstract
BackgroundElicitation of broad immune responses is understood to be required for an efficacious preventative HIV vaccine. This Phase 1 randomized controlled trial evaluated whether administration of vaccine antigens separated at multiple injection sites vs combined, fractional delivery at multiple sites affected T-cell breadth compared to standard, single site vaccination.MethodsWe randomized 90 participants to receive recombinant adenovirus 5 (rAd5) vector with HIV inserts gag, pol and env via three different strategies. The Standard group received vaccine at a single anatomic site (n = 30) compared to two polytopic (multisite) vaccination groups: Separated (n = 30), where antigens were separately administered to four anatomical sites, and Fractioned (n = 30), where fractions of each vaccine component were combined and administered at four sites. All groups received the same total dose of vaccine.FindingsCD8 T-cell response rates and magnitudes were significantly higher in the Fractioned group than Standard for several antigen pools tested. CD4 T-cell response magnitudes to Pol were higher in the Separated than Standard group. T-cell epitope mapping demonstrated greatest breadth in the Fractioned group (median 8.0 vs 2.5 for Standard, Wilcoxon p = 0.03; not significant after multiplicity adjustment for co-primary endpoints). IgG binding antibody response rates to Env were higher in the Standard and Fractioned groups vs Separated group.InterpretationThis study shows that the number of anatomic sites for which a vaccine is delivered and distribution of its antigenic components influences immune responses in humans.FundingNational Institute of Allergy and Infectious Diseases, NIH.
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- 2024
70. Strikingly High Activity of 15‐Lipoxygenase Towards Di‐Polyunsaturated Arachidonoyl/Adrenoyl‐Phosphatidylethanolamines Generates Peroxidation Signals of Ferroptotic Cell Death
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Samovich, Svetlana N, Mikulska‐Ruminska, Karolina, Dar, Haider H, Tyurina, Yulia Y, Tyurin, Vladimir A, Souryavong, Austin B, Kapralov, Alexander A, Amoscato, Andrew A, Beharier, Ofer, Karumanchi, S Ananth, St Croix, Claudette M, Yang, Xin, Holman, Theodore R, VanDemark, Andrew P, Sadovsky, Yoel, Mallampalli, Rama K, Wenzel, Sally E, Gu, Wei, Bunimovich, Yuri L, Bahar, Ivet, Kagan, Valerian E, and Bayir, Hülya
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Chemical Sciences ,Cell Death ,Mass Spectrometry ,Oxidation ,Phospholipids ,Redox Lipidomics ,Organic Chemistry ,Chemical sciences - Abstract
The vast majority of membrane phospholipids (PLs) include two asymmetrically positioned fatty acyls: oxidizable polyunsaturated fatty acids (PUFA) attached predominantly at the sn2 position, and non-oxidizable saturated/monounsaturated acids (SFA/MUFA) localized at the sn1 position. The peroxidation of PUFA-PLs, particularly sn2-arachidonoyl(AA)- and sn2-adrenoyl(AdA)-containing phosphatidylethanolamines (PE), has been associated with the execution of ferroptosis, a program of regulated cell death. There is a minor subpopulation (≈1-2 mol %) of doubly PUFA-acylated phospholipids (di-PUFA-PLs) whose role in ferroptosis remains enigmatic. Here we report that 15-lipoxygenase (15LOX) exhibits unexpectedly high pro-ferroptotic peroxidation activity towards di-PUFA-PEs. We revealed that peroxidation of several molecular species of di-PUFA-PEs occurred early in ferroptosis. Ferrostatin-1, a typical ferroptosis inhibitor, effectively prevented peroxidation of di-PUFA-PEs. Furthermore, co-incubation of cells with di-AA-PE and 15LOX produced PUFA-PE peroxidation and induced ferroptotic death. The decreased contents of di-PUFA-PEs in ACSL4 KO A375 cells was associated with lower levels of di-PUFA-PE peroxidation and enhanced resistance to ferroptosis. Thus, di-PUFA-PE species are newly identified phospholipid peroxidation substrates and regulators of ferroptosis, representing a promising therapeutic target for many diseases related to ferroptotic death.
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- 2024
71. Electing Sheriffs
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Farris, Emily M., author and Holman, Mirya R., author
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- 2024
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72. Filling in an Incomplete History of Sheriffs
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Farris, Emily M., author and Holman, Mirya R., author
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- 2024
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73. Sheriffs’ Authority as Elected Officials
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Farris, Emily M., author and Holman, Mirya R., author
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- 2024
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74. Sheriffs, Inequality, and the Possibility of Accountability
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Farris, Emily M., author and Holman, Mirya R., author
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- 2024
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75. The Radicalization of County Sheriffs
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Farris, Emily M., author and Holman, Mirya R., author
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- 2024
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76. Inequality from Autonomy and Authority
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Farris, Emily M., author and Holman, Mirya R., author
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- 2024
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77. Many Paths to the Summit: Survey of Step 1 Study Methods with Pass/Fail Scoring
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Wang, JiCi, Crumbley, Mary E., Nori, Santosh, Borah, Luca, Holman, Elizabeth, and Monrad, Seetha U.
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- 2024
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78. In silico design-space analysis of a novel tablet coating process using advanced modeling
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Boehling, Peter, Jajcevic, Dalibor, Detobel, Frederik, Holman, James, Bower, Laura, Metzger, Matthew, and Khinast, Johannes G.
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- 2024
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79. A randomized controlled trial evaluating the effects of nurse-led triage of 911 calls
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Wilson, Kevin H., Johnson, Rebecca A., Hatzimasoura, Chrysanthi, Holman, Robert P., Moore, Ryan T., and Yokum, David
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- 2024
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80. Can the introduction of a 12-lead ECG help reduce mortality in those presenting with foot ulceration to multidisciplinary diabetic foot clinics? An observational evaluation of a real-world implementation pilot in England
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Valabhji, Jonathan, Holman, Naomi, Collins, Nicholas, Young, Robert J., Chadwick, Paul, Robinson, Adam, Nayar, Rahul, Rajbhandari, Satyan, Coppini, David V., Kong, Marie-France, Ashwell, Simon, Nayak, Ananth, Mehta, Sanjeev, Manu, Chris, Edmonds, Michael, Gooday, Catherine, and Dhatariya, Ketan
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- 2024
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81. Direct inversion of the Longitudinal Ray Transform for 2D residual elastic strain fields
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Wensrich, C. M., Holman, S., Courdurier, M., Lionheart, W. R. B., Polyalova, A., and Svetov, I.
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Mathematics - Numerical Analysis - Abstract
We examine the problem of Bragg-edge elastic strain tomography from energy resolved neutron transmission imaging. A new approach is developed for two-dimensional plane-stress and plane-strain systems whereby elastic strain can be reconstructed from its Longitudinal Ray Transform (LRT) as two parts of a Helmholtz decomposition based on the concept of an Airy stress potential. The solenoidal component of this decomposition is reconstructed using an inversion formula based on a tensor filtered back projection algorithm whereas the potential part can be recovered using either Hooke's law or a finite element model of the elastic system. The technique is demonstrated for two-dimensional plane-stress systems in both simulation, and on real experimental data. We also demonstrate that application of the standard scalar filtered back projection algorithm to the LRT in these systems recovers the trace of the solenoidal component of strain and we provide physical meaning for this quantity in the case of 2D plane-stress and plane-strain systems., Comment: 30 pages, 9 figures
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- 2023
82. Fundamentals of impulsive energy release in the corona
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Shih, Albert Y., Glesener, Lindsay, Krucker, Säm, Guidoni, Silvina, Christe, Steven, Reeves, Katharine K., Gburek, Szymon, Caspi, Amir, Alaoui, Meriem, Allred, Joel, Battaglia, Marina, Baumgartner, Wayne, Dennis, Brian, Drake, James, Goetz, Keith, Golub, Leon, Hannah, Iain, Hayes, Laura, Holman, Gordon, Inglis, Andrew, Ireland, Jack, Kerr, Graham, Klimchuk, James, McKenzie, David, Moore, Christopher S., Musset, Sophie, Reep, Jeffrey, Ryan, Daniel, Saint-Hilaire, Pascal, Savage, Sabrina, Seaton, Daniel B., Stęślicki, Marek, and Woods, Thomas N.
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Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Solar and Stellar Astrophysics ,Physics - Plasma Physics ,Physics - Space Physics - Abstract
It is essential that there be coordinated and co-optimized observations in X-rays, gamma-rays, and EUV during the peak of solar cycle 26 (~2036) to significantly advance our understanding of impulsive energy release in the corona. The open questions include: What are the physical origins of space-weather events? How are particles accelerated at the Sun? How is impulsively released energy transported throughout the solar atmosphere? How is the solar corona heated? Many of the processes involved in triggering, driving, and sustaining solar eruptive events -- including magnetic reconnection, particle acceleration, plasma heating, and energy transport in magnetized plasmas -- also play important roles in phenomena throughout the Universe. This set of observations can be achieved through a single flagship mission or, with foreplanning, through a combination of major missions (e.g., the previously proposed FIERCE mission concept)., Comment: White paper submitted to the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033; 5 pages, 1 figure
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- 2023
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83. Heterogeneous cavitation from atomically smooth liquid-liquid interfaces
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Pfeiffer, Patricia, Shahrooz, Meysam, Tortora, Marco, Casciola, Carlo Massimo, Holman, Ryan, Salomir, Rares, Meloni, Simone, and Ohl, Claus-Dieter
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Physics - Fluid Dynamics - Abstract
Pressure reduction in liquids may result in vaporization and bubble formation. This thermodynamic process is termed cavitation. It is commonly observed in hydraulic machinery, ship propellers, and even in medical therapy within the human body. While cavitation may be beneficial for the removal of malign tissue, yet in many cases it is unwanted due to its ability to erode nearly any material in close contact. Current understanding is that the origin of heterogeneous cavitation are nucleation sites where stable gas cavities reside, e.g., on contaminant particles, submerged surfaces or shell stabilized microscopic bubbles. Here, we present the finding of a so far unreported nucleation site, namely the atomically smooth interface between two immiscible liquids. The non-polar liquid of the two has a higher gas solubility and acts upon pressure reduction as a gas reservoir that accumulates at the interface. We describe experiments that clearly reveal the formation of cavitation on non-polar droplets in contact with water and elucidate the working mechanism that leads to the nucleation of gas pockets through simulations., Comment: This preprint has not undergone peer review or any post-submission improvements or corrections. The Version of Record of this article is published in Nature Physics, and is available online at https://doi.org/10.1038/s41567-022-01764-z
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- 2023
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84. Betamethasone improved near‐term neonatal lamb lung maturation in experimental maternal asthma
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Joshua L. Robinson, Andrea J. Roff, Sarah J. Hammond, Jack R. T. Darby, Ashley S. Meakin, Stacey L. Holman, Andrew Tai, Tim J. M. Moss, Catherine G. Dimasi, Sarah M. Jesse, Michael D. Wiese, Andrew N. Davies, Beverly S. Muhlhausler, Robert J. Bischof, Megan J. Wallace, Vicki L. Clifton, Janna L. Morrison, Michael J. Stark, and Kathryn L. Gatford
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animal ,disease models ,glucocorticoids ,newborn ,physiopathology ,pregnancy complications ,Physiology ,QP1-981 - Abstract
Abstract Maternal asthma is associated with increased rates of neonatal lung disease, and fetuses from asthmatic ewes have fewer surfactant‐producing cells and lower surfactant‐protein B gene (SFTPB) expression than controls. Antenatal betamethasone increases lung surfactant production in preterm babies, and we therefore tested this therapy in experimental maternal asthma. Ewes were sensitised to house dust mite allergen, and an asthmatic phenotype induced by fortnightly allergen lung challenges; controls received saline. Pregnant asthmatic ewes were randomised to receive antenatal saline (asthma) or 12 mg intramuscular betamethasone (asthma+beta) at 138 and 139 days of gestation (term = 150 days). Lambs were delivered by Caesarean section at 140 days of gestation and ventilated for 45 min before tissue collection. Lung function and structure were similar in control lambs (n = 16, 11 ewes) and lambs from asthma ewes (n = 14, 9 ewes). Dynamic lung compliance was higher in lambs from asthma+beta ewes (n = 12, 8 ewes) compared to those from controls (P = 0.003) or asthma ewes (P = 0.008). Lung expression of surfactant protein genes SFTPA (P = 0.048) and SFTPB (P
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- 2024
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85. Dyed Hair and Swimming Pools: The Influence of Chlorinated and Nonchlorinated Agitated Water on Surface-Enhanced Raman Spectroscopic Analysis of Artificial Dyes on Hair
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Aidan P. Holman, Roa Elsaigh, Ragd Elsaigh, Axell Rodriguez, and Dmitry Kurouski
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Chemistry ,QD1-999 - Published
- 2024
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86. Using Communities of Practice to Navigate the Professoriate in Contemporary Academia: A Co/Autoethnography of Seven University Faculty
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Dan McCole, Andrew J. Bobilya, Betsy Lindley, Thomas Holman, Paul Shirilla, Jeffrey Jacobs, and Leo McAvoy
- Abstract
Life in academia can be difficult. Studies of faculty show high levels of stress leading to impaired productivity, exhaustion, pessimism, and disillusionment. Methods for addressing workplace stress including mentoring, professional/social interaction, and work-family enrichment have been well documented. This co/autoethnographic study examined a Community of Practice (CoP) composed of seven university faculty members over a 20-year period. A CoP can mitigate the stressors of academic careers, while improving quality of life. This study examined the role of our CoP in our personal and professional lives. Emergent themes included: professional development, shared play, and commitment, ultimately forming a community of care. This study and its findings may be useful for both faculty and those involved in faculty development.
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- 2024
87. Humanizing Collectivist Critical Pedagogy: Teaching the Humanities in Community College and Beyond
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Sujung Kim, Leigh Garrison-Fletcher, Kaysi Holman, Sujung Kim, Leigh Garrison-Fletcher, and Kaysi Holman
- Abstract
This book provides concrete examples of humanizing collectivist critical pedagogy, which creates a learning space with students, values their mutual-agency, and invites them to play a leading role in remaking higher education. It redefines student success to include an understanding of positionality, macro social structures, and agency. Each class activity shared in this book is grounded in deep interdisciplinary theory and has been tested in community college--some of the most diverse humanities classrooms in the U.S. The contributing authors present their teaching praxis with examples of program administration, extracurricular programs, and pedagogical professional development that further extend their pedagogy beyond the classroom. We hope to help administrators, staff, faculty, and students of all levels in higher education take what the authors have learnt, build upon it, and adapt pieces of it to fi t their institutional environment and structures. Given the manner in which the debilitating structures of schooling continue to reinforce the dehumanization and alienation of students worldwide, Humanizing, Community-Based, Critical Pedagogy offers educators powerful insights into how they can enact a praxis of empowerment and transformation. The volume is truly an outstanding addition to the critical pedagogy literature.
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- 2024
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88. A Creative Ecological Approach to Supporting Young People with Mental Health Challenges in Schools
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Daniel X. Harris and Stacy Holman Jones
- Abstract
Holistic and ecological approaches to mental health support have been identified by many as best-practice approaches for creating and sustaining well-being. Those who experience mental health challenges including, for example, Borderline Personality Disorder (BPD), often struggle to find adequate, sustainable and ongoing care from clinical settings, and recent research shows that additional strategies such as peer support programs, arts approaches, and holistic school-based collaboration work effectively. More generally, the mainstream population continues to suffer from outdated, overly medicalised and frequently inaccurate notions of the experience of poor mental health and the effective support of those who suffer, and peer- and school-integrated approaches go some way toward better education about mental ill-health. This article uses a creative ecologies model (Harris, 2016) to help schools implement student- and family-led support programs for students experiencing mental health challenges in school settings.
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- 2024
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89. Elaborating on 'The Talk' in 'Sex Talks': An Interdisciplinary Exploration of the Place of Communication Science in Sexuality Education and Advocacy
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Angela Cooke-Jackson, Valerie Rubinsky, Jacqueline N. Gunning, Emily Gerlikovski, Amanda Holman, Jimmie Manning, Bolivar X. Nieto, Carey Noland, Andrew Spieldenner, Sarah De Los Santos Upton, and Carina M. Zelaya
- Abstract
Building from a panel at the 2022 National Communication Association (NCA) annual convention, the present article seeks to ground communication studies/sciences as central to interdisciplinary conversations surrounding sexuality education and communication. Communication is integral to sexuality education, and topics of communication, sex, and sexuality education are researched across disciplines. Still, research on sexuality education within communication studies remains under-attended, and interdisciplinary sexuality education research remains siloed by academic discipline. Presenting a forum featuring both emerging and leading scholars in the field of communication researching sex(uality) education, the present article seeks to establish the academic discipline of communication as integral to research on sexuality education. To do so, we first discuss communication as an academic discipline and its advancements in sexuality education research. Next, communication scholars offer their expertise in sex(uality education) communication topics including family conversations, cultural influence, health inequities in education, and medicine. Collectively, these perspectives offer an understanding of current sexual health research in the field of communication, as well as next steps through direct application to conversations about sex, improvement to our medical and education systems, and community-based education and intervention. It is our hope that this article fosters a larger conversation about the importance of communication (studies/sciences) in sexuality education.
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- 2024
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90. Lifetime and Acute Stress Predict Functional Outcomes Following Stroke: Findings From the Longitudinal STRONG Study.
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Holman, Ellen and Cramer, Steven
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activities of daily living ,cognitive impairment ,psychological trauma ,recovery of function ,stress disorders ,traumatic ,acute ,stroke ,Adult ,Humans ,Male ,Young Adult ,Middle Aged ,Aged ,Aged ,80 and over ,Female ,Activities of Daily Living ,Stroke Rehabilitation ,Recovery of Function ,Stroke ,Upper Extremity - Abstract
BACKGROUND: Stroke is a sudden-onset, uncontrollable event; stroke-related stress may impede rehabilitation and recovery. Lifetime stress may sensitize patients to experiencing greater stroke-related stress and indirectly affect outcomes. We examine lifetime stress as predictor of poststroke acute stress and examine lifetime and acute stress as predictors of 3- and 12-month functional status. We also compare acute stress and baseline National Institutes of Health Stroke Scale as predictors of poststroke functional status. METHODS: Between 2016 and 2020 the STRONG Study (Stroke, Stress, Rehabilitation, and Genetics) enrolled adults with new radiologically confirmed stroke 2 to 10 days poststroke onset at 28 acute care US hospitals. Participants were interviewed 3 times: acute admission (acute stress; Acute Stress Disorder Interview), 3 months (Fugl-Meyer Upper Extremity motor impairment [Fugl-Meyer Upper Arm Assessment; N=431], modified Rankin Scale [3 months; N=542], Stroke Impact Scale-Activities of Daily Living [3 months; N=511], Lifetime Stress Exposure Inventory), and 12 months (modified Rankin Scale, N=533; Stroke Impact Scale 3.0 Activities of Daily Living; N=485; Telephone Montreal Cognitive Assessment; N=484) poststroke. Structural equation models examined whether acute stress predicted 3- and 12-month functional outcomes, and mediated an association between lifetime stress and outcomes controlling for demographics and initial National Institutes of Health Stroke Scale. Standardized betas are reported. RESULTS: Sample (N=763) was 19 to 95 years old (mean=63; SD=14.9); 448 (58.7%) were male. Acute stress scores ranged from 0 to 14 (mean, 3.52 [95% CI, 3.31-3.73]). Controlling for age, gender, baseline National Institutes of Health Stroke Scale, and race and ethnicity, higher lifetime stress predicted higher acute stress (β=0.18, P0.18), but Fugl-Meyer scores (χ2[1]=7.01, P=0.008) less strongly than baseline National Institutes of Health Stroke Scale. CONCLUSIONS: Lifetime stress/trauma is associated with more poststroke acute stress, which is associated with greater motor and cognitive impairment and disability 3 and 12 months poststroke. Poststroke interventions for acute stress may help mitigate stroke-related disability.
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- 2023
91. Conductive electrospun polymer improves stem cell-derived cardiomyocyte function and maturation
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Gonzalez, Gisselle, Nelson, Aileena C, Holman, Alyssa R, Whitehead, Alexander J, LaMontagne, Erin, Lian, Rachel, Vatsyayan, Ritwik, Dayeh, Shadi A, and Engler, Adam J
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Engineering ,Biomedical Engineering ,Cardiovascular ,Regenerative Medicine ,Stem Cell Research ,Stem Cell Research - Induced Pluripotent Stem Cell ,Stem Cell Research - Embryonic - Human ,Stem Cell Research - Induced Pluripotent Stem Cell - Human ,Heart Disease ,5.2 Cellular and gene therapies ,Humans ,Myocytes ,Cardiac ,Polymers ,Pluripotent Stem Cells ,Cell Line ,Cell Differentiation ,Electric Conductivity ,sulfonate ,poly(vinyl) alcohol ,Desmoplakin ,Sarcomere organization ,Calcium handling ,FluoVolt ,poly(3 ,4-ethylenedioxythiophene):polystyrene ,poly(3 ,4-ethylenedioxythiophene):polystyrene sulfonate - Abstract
Despite numerous efforts to generate mature human pluripotent stem cell-derived cardiomyocytes (hPSC-CMs), cells often remain immature, electrically isolated, and may not reflect adult biology. Conductive polymers are attractive candidates to facilitate electrical communication between hPSC-CMs, especially at sub-confluent cell densities or diseased cells lacking cell-cell junctions. Here we electrospun conductive polymers to create a conductive fiber mesh and assess if electrical signal propagation is improved in hPSC-CMs seeded on the mesh network. Matrix characterization indicated fiber structure remained stable over weeks in buffer, scaffold stiffness remained near in vivo cardiac stiffness, and electrical conductivity scaled with conductive polymer concentration. Cells remained adherent and viable on the scaffolds for at least 5 days. Transcriptomic profiling of hPSC-CMs cultured on conductive substrates for 3 days showed upregulation of cardiac and muscle-related genes versus non-conductive fibers. Structural proteins were more organized and calcium handling was improved on conductive substrates, even at sub-confluent cell densities; prolonged culture on conductive scaffolds improved membrane depolarization compared to non-conductive substrates. Taken together, these data suggest that blended, conductive scaffolds are stable, supportive of electrical coupling in hPSC-CMs, and promote maturation, which may improve our ability to model cardiac diseases and develop targeted therapies.
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- 2023
92. Cryo-EM structures of human arachidonate 12S-lipoxygenase bound to endogenous and exogenous inhibitors
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Mobbs, Jesse I, Black, Katrina A, Tran, Michelle, Burger, Wessel AC, Venugopal, Hariprasad, Holman, Theodore R, Holinstat, Michael, Thal, David M, and Glukhova, Alisa
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Biochemistry and Cell Biology ,Biological Sciences ,Hematology ,Clinical Research ,Development of treatments and therapeutic interventions ,5.1 Pharmaceuticals ,United States ,Humans ,Cryoelectron Microscopy ,Platelet Activation ,Arachidonic Acid ,Arachidonate 12-Lipoxygenase ,Thrombocytopenia ,Cardiorespiratory Medicine and Haematology ,Clinical Sciences ,Paediatrics and Reproductive Medicine ,Immunology ,Biochemistry and cell biology ,Cardiovascular medicine and haematology ,Paediatrics - Abstract
Human 12-lipoxygenase (12-LOX) is a key enzyme involved in platelet activation, and the regulation of its activity has been targeted for the treatment of heparin-induced thrombocytopenia. Despite the clinical importance of 12-LOX, the exact mechanisms by which it affects platelet activation are not fully understood, and the lack of structural information has limited drug discovery efforts. In this study, we used single-particle cryo-electron microscopy to determine high-resolution structures (1.7-2.8 Å) of human 12-LOX. Our results showed that 12-LOX can exist in multiple oligomeric states, from monomer to hexamer, which may affect its catalytic activity and membrane association. We also identified different conformations within the 12-LOX dimer, which likely represent different time points in its catalytic cycle. Furthermore, we identified small molecules bound to 12-LOX. The active site of the 12-LOX tetramer was occupied by an endogenous 12-LOX inhibitor, a long-chain acyl coenzyme A. In addition, we found that the 12-LOX hexamer can simultaneously bind to arachidonic acid and ML355, a selective 12-LOX inhibitor that has passed a phase 1 clinical trial for the treatment of heparin-induced thrombocytopenia and received a fast-track designation by the Food and Drug Administration. Overall, our findings provide novel insights into the assembly of 12-LOX oligomers, their catalytic mechanism, and small molecule binding, paving the way for further drug development targeting the 12-LOX enzyme.
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- 2023
93. Investigating the catalytic efficiency of C22-Fatty acids with LOX human isozymes and the platelet response of the C22-oxylipin products
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Tran, Michelle, Stanger, Livia, Narendra, Srihari, Holinstat, Michael, and Holman, Theodore R
- Subjects
Biological Sciences ,Industrial Biotechnology ,Humans ,Fatty Acids ,Oxylipins ,Arachidonate 15-Lipoxygenase ,Isoenzymes ,Collagen ,Scavenger Receptors ,Class E ,Biochemistry & Molecular Biology - Abstract
Polyunsaturated fatty acids (PUFAs) have been extensively studied for their health benefits because they can be oxidized by lipoxygenases to form bioactive oxylipins. In this study, we investigated the impact of double bond placement on the kinetic properties and product profiles of human platelet 12-lipoxygenase (h12-LOX), human reticulocyte 15-lipoxygenase-1 (h15-LOX-1), and human endothelial 15-lipoxygenase-2 (h15-LOX-2) by using 22-carbon (C22) fatty acid substrates with differing double bond content. With respect to kcat/KM values, the loss of Δ4 and Δ19 led to an 18-fold loss of kinetic activity for h12-LOX, no change in kinetic capability for h15-LOX-1, but a 24-fold loss for h15-LOX-2 for both C22-FAs. With respect to the product profiles, h12-LOX produced mainly 14-oxylipins. For h15-LOX-1, the 14-oxylipin production increased with the loss of either Δ4 and Δ19, however, the 17-oxylipin became the major species upon loss of both Δ4 and Δ19. h15-LOX-2 produced mostly the 17-oxylipin products throughout the fatty acid series. This study also investigated the effects of various 17-oxylipins on platelet activation. The results revealed that both 17(S)-hydroxy-4Z,7Z,10Z,13Z,15E,19Z-DHA (17-HDHA) and 17-hydroxy-4Z,7Z,10Z,13Z,15E-DPAn6 (17-HDPAn6) demonstrated anti-aggregation properties with thrombin or collagen stimulation. 17-hydroxy-7Z,10Z,13Z,15E,19Z-DPAn3 (17-HDPAn3) exhibited agonistic properties, and 17-hydroxy-7Z,10Z,13Z,15E-DTA (17-HDTA) showed biphasic effects, inhibiting collagen-induced aggregation at lower concentrationsbut promoting aggregation at higher concentrations. Both 17-hydroxy-13Z,15E,19Z-DTrA (17-HDTrA), and 17-hydroxy-13Z,15E-DDiA (17-HDDiA) induced platelet aggregation. In summary, the number and placement of the double bonds affect platelet activation, with the general trend being that more double bonds generally inhibit aggregation, while less double bonds promote aggregation. These findings provide insights into the potential role of specific fatty acids and their metabolizing LOX isozymes with respect to cardiovascular health.
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- 2023
94. Toward implementing autonomous adaptive data acquisition for scanning hyperspectral imaging of biological systems
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Holman, Elizabeth A, Krishnan, Harinarayan, Holman, Derek R, Holman, Hoi-Ying N, and Sternberg, Paul W
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Engineering ,Macromolecular and Materials Chemistry ,Materials Engineering ,Chemical Sciences ,Bioengineering ,Condensed Matter Physics ,Macromolecular and materials chemistry ,Materials engineering - Abstract
Autonomous experimentation is an emerging area of research, primarily related to autonomous vehicles, scientific combinatorial discovery approaches in materials science and drug discovery, and iterative research loops of planning, experimentation, and analysis. However, autonomous approaches developed in these contexts are difficult to apply to high-dimensional mapping technologies, such as scanning hyperspectral imaging of biological systems, due to sample complexity and heterogeneity. We briefly cover the history of adaptive sampling algorithms and surrogate modeling in order to define autonomous adaptive data acquisition as an objective-based, flexible building block for future biological imaging experimentation driven by intelligent infrastructure. We subsequently summarize the recent implementations of autonomous adaptive data acquisition (AADA) for scanning hyperspectral imaging, assess how these address the difficulties of autonomous approaches in hyperspectral imaging, and highlight the AADA design variation from a goal-oriented perspective. Finally, we present a modular AADA architecture that embeds AADA-driven flexible building blocks to address the challenge of time resolution for high-dimensional scanning hyperspectral imaging of nonequilibrium dynamical systems. In our example research-driven experimental design case, we propose an AADA infrastructure for time-resolved, noninvasive, and label-free scanning hyperspectral imaging of living biological systems. This AADA infrastructure can accurately target the correct state of the system for experimental workflows that utilize subsequent expensive, high-information-content analytical techniques.
- Published
- 2023
95. ASSIST: An Ephemeris-Quality Test Particle Integrator
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Holman, Matthew J., Akmal, Arya, Farnocchia, Davide, Rein, Hanno, Payne, Matthew J., Weryk, Robert, Tamayo, Daniel, and Hernandez, David M.
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
We introduce ASSIST, a software package for ephemeris-quality integrations of test particles. ASSIST is an extension of the REBOUND framework and makes use of its IAS15 integrator to integrate test particle trajectories in the field of the Sun, Moon, planets, and 16 massive asteroids, with the positions of the masses coming from the JPL DE441 ephemeris and its associated asteroid perturber file. The package incorporates the most significant gravitational harmonics and general relativistic corrections. ASSIST also accounts for position- and velocity-dependent non-gravitational effects. The first order variational equations are included for all terms to support orbit fitting and covariance mapping. This new framework is meant to provide an open-source package written in a modern language to enable high-precision orbital analysis and science by the small body community. ASSIST is open source, freely distributed under the GNU General Public license, version 3., Comment: Submitted to PSJ (27 January 2023), Revised (28 March 2023)
- Published
- 2023
96. Boundary Recovery of Anisotropic Electromagnetic Parameters for the Time Harmonic Maxwell's Equations
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Holman, Sean and Torega, Vasiliki
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Mathematics - Analysis of PDEs ,Mathematics - Differential Geometry ,35R30, 35S15, 35Q61, 53B50 - Abstract
This work concerns inverse boundary value problems for the time-harmonic Maxwell's equations on differential $1-$forms. We formulate the boundary value problem on a $3-$dimensional compact and simply connected Riemannian manifold $M$ with boundary $\partial M$ endowed with a Riemannian metric $g$. Assuming that the electric permittivity $\varepsilon$ and magnetic permeability $\mu$ are real-valued anisotropic (i.e $(1,1)-$ tensors), we aim to determine certain metrics induced by these parameters, denoted by $\hat{\varepsilon}$ and $\hat{\mu}$ at $\partial M$. We show that the knowledge of the impedance and admittance maps determines the tangential entries of $\hat{\varepsilon}$ and $\hat{\mu}$ at $\partial M$ in their boundary normal coordinates, although the background volume form cannot be determined in such coordinates due to a non-uniqueness occuring from diffeomorphisms that fix the boundary. Then, we prove that in some cases, we can also recover the normal components of $\hat{\mu}$ up to a conformal multiple at $\partial M$ in boundary normal coordinates for $\hat{\varepsilon}$. Last, we build an inductive proof to show that if $\hat{\varepsilon}$ and $\hat{\mu}$ are determined at $\partial M$ in boundary normal coordinates for $\hat{\varepsilon}$, then the same follows for their normal derivatives of all orders at $\partial M$., Comment: 40 pages, 1 figure
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- 2023
97. Health-related Quality of Life and Exercise Capacity in Double Lung Transplant Recipients With Baseline Lung Allograft Dysfunction
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Alisha Rullay, BSc, Karina Kaur, BSc, Jennifer Holman, PT, Laura C. van den Bosch, MD, Justin G. Weinkauf, MD, Jayan Nagendran, MD, PhD, Rhea A. Varughese, MD, Alim S. Hirji, MD, Dale C. Lien, MD, Jason C. Weatherald, MD, and Kieran M. Halloran, MD
- Subjects
Surgery ,RD1-811 - Abstract
Background. Baseline lung allograft dysfunction (BLAD) after lung transplant is associated with an increased risk of dying, but the association with health-related quality of life (HRQL) and exercise capacity is not known. We hypothesized that BLAD would be associated with reduced HRQL and 6-min walk distance (6MWD) at 1 y post–lung transplant. Methods. We analyzed patients who underwent lung transplants in our program from 2004 to 2018 who completed 1-y 36-item Short Form (SF-36) questionnaire and 6MWD testing. We secondarily analyzed the Beck Depression Inventory and Borg dyspnea scores in patients using the available data. We defined BLAD as a failure of both forced expiratory volume in 1 s and forced vital capacity to reach ≥80% predicted of a healthy reference population’s lung function on 2 consecutive tests ≥3 wk apart at any time point posttransplant. We tested the relationship between BLAD status and SF-36 physical component summaries and 6MWD using least squares regression, adjusting for age at transplant, sex at birth, and primary lung disease. Results. Two hundred sixty-four patients were included, 96 (36%) of whom met the criteria for BLAD. Patients with interstitial lung disease as an indication for transplant and those who received older, female, and heavy smoking donors were at increased risk of BLAD. SF-36 physical component summary scores were lower in patients with BLAD (75 versus 85; P = 0.0076), as were 6MWD values (528 versus 572 m; P = 0.0053). BLAD was associated with lower SF-36 scores (P = 0.0025) and 6MWD (P = 0.0008) in adjusted regression models at 1 y posttransplant. We did not observe differences in Beck Depression Inventory or Borg scores. Conclusions. BLAD was associated with reduced HRQL and 6MWD scores at 1 y posttransplant in adjusted models. This suggests that poor posttransplant lung function could contribute to lower HRQL and exercise capacity in lung recipients and is worthy of further exploration in terms of causes, prevention, and treatment.
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- 2025
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98. Evaluating the Adequacy of Central Line-Associated Bloodstream Infection As a Quality Measure: A Cross-Sectional Analysis at a Single Tertiary Care Center
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Piyush Mathur, MD, FCCM, FASA, FAMIA, Amanda J. Naylor, MD, MPH, Moises Auron, MD, Jean Beresian, MD, Alexandra Tallman, BSN, RN, SANE-A, Allison Griffith, MSN, RN, CCRN, CPHQ, Kathleen Seasholtz, BSN, RN, HACP, Mariel Manlapaz, MD, Katherine Zacharyasz, MSN, RN, CPHQ, Reem Khatib, MD, MBA, FASA, Shreya Mishra, PhD, Kathryn Haller, PA, Thomas Fraser, MD, and Katherine Holman, MD
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Medical emergencies. Critical care. Intensive care. First aid ,RC86-88.9 - Abstract
IMPORTANCE:. The current definition of central line-associated bloodstream infection (CLABSI) may overestimate the true incidence of CLABSI as it is often unclear whether the bloodstream infection (BSI) is secondary to the central line or due to another infectious source. OBJECTIVES:. We aimed to assess the prevalence and outcomes of central CLABSI at our institution, to identify opportunities for improvement, appropriately direct efforts for infection reduction, and identify gaps in the CLABSI definition and its application as a quality measure. DESIGN, SETTING, AND PARTICIPANTS:. Retrospective cross-sectional study of patients identified to have a CLABSI in the period 2018–2022 cared for at the value-based purchasing (VBP) units of a 1200-bed tertiary care hospital located in Cleveland, OH. Each CLABSI episode was assessed for relationship with central venous catheter (CVC), suspected secondary source of BSI, mortality associated with the CLABSI hospital encounter, and availability of infectious disease physician or primary physician documentation of infectious source. MAIN OUTCOMES AND MEASURES:. CLABSI episodes were classified as CVC related, CVC unrelated, and CVC relationship unclear. Mortality during the same encounter as the CLABSI event was assessed as an outcome measure. Descriptive statistics were performed. RESULTS:. A total of 340 CLABSI episodes occurred in adult patients in VBP units. Majority of the CLABSI, 77.5% (266), occurred in the ICU. Of the CLABSI analyzed, 31.5% (107) were classified as unrelated to the CVC; 25.0% (85) had an unclear source; 43% (148) were classified as CVC related. For CVC-related cases, Staphylococcus and Candida were the predominant organisms. For the CVC unrelated and unclear groups Enterococcus was most prevalent. The mortality rate was lowest among patients classified with a CVC-related BSI. The positive predictive value (PPV) of the Centers for Disease Control and Prevention CLABSI definition to predict a true CVC-related infection was found to be 58.0%. CONCLUSIONS AND RELEVANCE:. The definition of CLABSI as a surrogate for catheter-related BSI is inadequate, with a PPV of 58.0% (43.1–67.6%). Efforts should be redirected toward revising the CLABSI definition and possibly reevaluating its criteria. Resources should be assigned to further investigate and systematically prevent BSIs from secondary sources while adhering to existing CLABSI prevention bundles.
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- 2025
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99. Synthesis, in silico and antimicrobial activity study of substituted aromatic imines and their corresponding amines
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Hanna Abbo, Darin Edward Holman, Mohamed-Deen Hendricks, Christiana Abimbola Salubi, Marshall Keyster, and Salam Titinchi
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Antimicrobial activity ,In silico ,Sec-amines ,Schiff base ,P. aeruginosa ,P. agglomerans ,Chemistry ,QD1-999 - Abstract
The antimicrobial properties of Schiff bases and their corresponding amines were assessed by exploring the impact of substituent variations on these activities. The present study involved the synthesis of Schiff base compounds and their corresponding sec-amines, characterization, antibacterial testing, and molecular docking studies. These compounds featured diverse structural components, including alkyl chains, phenyl and methoxy groups. Three of the synthesized compounds are new, viz. N-[(2,3-dimethoxyphenyl) methylene]-1-propanamine (1), N-[(2,3-dimethoxyphenyl)methyl]-1-propanamine (2) and N-[(2,3-dimethoxyphenyl)methylene]-1-butanamine (3). The assessment of antibacterial properties targeted two strains recognized as opportunistic pathogens. Notably, all Schiff base compounds possessing the −C=N moiety exhibited good antibacterial activity against P. aeruginosa and P. agglomerans. Specifically, 1 and 3 demonstrated exceptional effectiveness against the tested bacterial strains, showcasing promising antibacterial capabilities. Furthermore, binding energy calculations revealed that compounds 1 and 3 exhibited binding energies of −3.9, −4.1, and −3.8, −3.9 kcal/mol with respect to P. agglomerans and P. aeruginosa candidate proteins, respectively. This underscores the strong interaction between the synthesized compounds and the bacterial strains, further supporting their potential as potent antimicrobial agents. P. aeruginosa and P. agglomerans were found to be sensitive to both compounds 1 and 3, as well as the standard control ampicillin. The MIC values for P. aeruginosa were 10 mM for 1, and 6 mM for 3. While for P. agglomerans, the MIC values were 6 mM for both 1 and 3.
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- 2025
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100. Tumor-Infiltrating Immune Cells in Colorectal Cancer
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Sonia A.M. Ferkel, Elizabeth A. Holman, Raoul S. Sojwal, Samuel J.S. Rubin, and Stephan Rogalla
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Colorectal cancer encompasses a heterogeneous group of malignancies that differ in pathophysiological mechanisms, immune response and infiltration, therapeutic response, and clinical prognosis. Numerous studies have highlighted the clinical relevance of tumor-infiltrating immune cells among different types of colorectal tumors yet vary in cell type definitions and cell identification strategies. The distinction of immune signatures is particularly challenging when several immune subtypes are involved but crucial to identify novel intercellular mechanisms within the tumor microenvironment. In this review, we compile human and non-human studies on tumor-infiltrating immune cells and provide an overview of immune subtypes, their pathophysiological functions, and their prognostic role in colorectal cancer. We discuss how differentiating immune signatures can guide the development of immunotherapeutic targets and personalized treatment regimens. We analyzed comprehensive human protein biomarker profiles across the entire immune spectrum to improve interpretability and application of tumor studies and to ultimately enhance immunotherapy and advance precision medicine for colorectal cancer patients.
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- 2025
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