Publications by authors named "Andrew S"

Article Synopsis
  • Fast radio bursts (FRBs) are brief bursts of radio waves from distant galaxies, and their emission mechanisms are still debated, focusing on processes near a central engine versus shocks at large distances.
  • Researchers measured two scintillation scales for FRB 20221022A, one linked to the Milky Way and the other to its host galaxy, which allowed them to determine the FRB's emission region size to be less than 3 x 10 kilometers.
  • This size contradicts the large-distance model and suggests that the emission likely occurs close to a central compact object, supported by an observed S-shaped polarization angle, indicating a magnetospheric emission process.
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  • Fast radio bursts (FRBs) are intense signals from deep space that last for milliseconds and share some characteristics with pulsars, suggesting they may originate from neutron stars.
  • Despite similarities, FRBs like 20221022A display different patterns in their linear polarization position angle (PA), particularly a 130° rotation that aligns with pulsar behaviors, hinting at magnetospheric origins.
  • This study rules out short-period pulsars as potential sources for FRB 20221022A, supporting the idea that its unique PA evolution fits the rotating vector model commonly used for pulsars.
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  • Warmer and variable temperatures are linked to the decline of Atlantic salmon in Eastern Canada, raising concerns about how these temperature changes affect fish swimming performance.
  • The study investigates the effects of warm versus cool daily temperature changes on swimming efficiency and overall swimming capabilities in juvenile Atlantic salmon.
  • Results show that while acclimation to different thermal profiles didn't significantly impact swimming efficiency, sudden exposure to higher temperatures did elevate metabolic rates, suggesting that salmon can still swim effectively in both warm and cool conditions.
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  • Electronic handgrip dynamometry was used to measure various aspects of muscle function in both upper and lower extremities among resistance-trained adults, but the links between these muscle functions were previously unknown.
  • A study involving 30 adults found that strength was significantly correlated between dominant limbs for both upper (r = 0.76) and lower (r = 0.67) extremities, indicating that handgrip strength may reflect overall muscle strength.
  • The research highlighted that while strength correlations were common across age groups, differences emerged in RFD and endurance, suggesting that handgrip dynamometry could serve as a valuable tool for assessing muscle function in diverse populations.
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This study investigates the dynamics of collaborative characteristics, interpersonal reactivity, and disaster situation responses in non-face-to-face settings, a response mechanism increasingly relevant in the wake of prolonged pandemics. By examining a group of 123 university students engaged in a seven-week non-face-to-face collaborative project, the research identifies relational patterns between collaborative traits such as regulation and efficacy, interpersonal empathy, and responses to disaster situations. The research methodology employs a sophisticated analytical framework comprising factor and canonical correlation analyses to identify how empathy and collaborative efficacy significantly related with disaster response in online collaborations.

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A mucosal route of vaccination could prevent severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) replication at the site of infection and limit transmission. We compared protection against heterologous XBB.1.

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SARS-CoV-2 has the capacity to evolve mutations that escape vaccine- and infection-acquired immunity and antiviral drugs. A variant-agnostic therapeutic agent that protects against severe disease without putting selective pressure on the virus would thus be a valuable biomedical tool that would maintain its efficacy despite the ongoing emergence of new variants. Here, we challenge male rhesus macaques with SARS-CoV-2 Delta-the most pathogenic variant in a highly susceptible animal model.

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The practice of gathering and utilizing Ziziphus tree fruits serves as a key strategy to enhance nutrition and livelihoods employed by rural communities across various regions worldwide. Despite a burgeoning interest in and comprehension of their significance, there remains a dearth of information concerning the morphological attributes of both fruits and seeds essential for bolstering resistance against pests and diseases through breeding efforts. In this regard, comprehensive data pertaining to fruit dimensions (length, width, weight, and maturity level) and seed characteristics (length, width, and 100-seed weight) across three distinct land use types (LUT)-farmland (FL), home garden (HG), and roadside (RS)-were systematically gathered to ascertain the variability in traits among tree species in the Bosset and Bati districts of Ethiopia.

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The increasing frequency and severity of heatwaves will intensify stress on plants. Given regional variation in heatwave exposure and expected differences in thermal tolerance between species it is unlikely that all plant species will be affected equally by climate change. However, little is currently known about variation in the responses of plants to heat stress, or how those responses differ among closely related species adapted to different environments.

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Alzheimer's Disease (AD) is characterized by its complex and heterogeneous etiology and gradual progression, leading to high drug failure rates in late-stage clinical trials. In order to better stratify individuals at risk for AD and discern potential therapeutic targets we employed a novel procedure utilizing cell-based co-regulated gene networks and polygenic risk scores (cbPRSs). After defining genetic subtypes using extremes of cbPRS distributions, we evaluated correlations of the genetic subtypes with previously defined AD subtypes defined on the basis of domain-specific cognitive functioning and neuroimaging biomarkers.

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Aim: To examine final-year undergraduate nursing students' characteristics and their perceived preparedness for medication administration across three universities during COVID-19.

Background: Medication administration is a complex process and medication errors can cause harm to the patient. Nurses are at the frontline of medication administration; therefore, nursing students must be well-prepared to administer medicines safely before graduation.

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Article Synopsis
  • Researchers studied how mRNA vaccine boosters affect antibody responses in both mice and humans, finding that initial vaccine doses influenced responses to newer variants.
  • In humans, receiving Omicron-matched boosters after prior vaccinations led to a broadened antibody response, suggesting that imprinting can promote the production of antibodies that are effective against various SARS-CoV-2 variants and related viruses.
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Background: Virtual healthcare solutions are proposed as a way to combat the inequity of access to healthcare in rural and remote areas, and to better support the front-line providers who work in these areas. Rural provider-to-provider telehealth (RPPT) connects rural and remote clinicians to a 'hub' of healthcare specialists who can increase access to emergency and specialised healthcare via an integrated model. Reported benefits for the place-based provider include enhanced knowledge, expanded professional development opportunities, improved scope of practice, and increased confidence in treating more complex cases.

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Temperature in many natural aquatic environments follows a diel cycle, but to date, we know little on how diel thermal cycles affect fish biology. The current study investigates the growth, development and physiological performance of wild Atlantic salmon collected from the Miramichi and Restigouche rivers (NB, Canada). Fish were collected as parr and acclimated to either 16-21 or 19-24°C diel thermal cycles throughout the parr and smolt life stages.

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Background: Changes in oral microbiota composition (dysbiosis) have long been known to play a key role in the pathogenesis of oral and systemic diseases including respiratory diseases. However, till now, no study has assessed changes in oral microbiota following tuberculosis (TB) infection in humans.

Aims: This is the first study of its kind that aimed to investigate oral microbial dysbiosis in newly diagnosed, treatment naïve, TB patients.

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Background: Prolonged use of medical masks has increased skin-related issues.

Aim: To evaluate the efficacy of a facial cream and facial mask in mitigating medical mask related skin symptoms.

Methods: Healthy women were randomly assigned to apply a facial cream (n = 32) or a facial mask plus a facial cream (n = 32) on half-faces after wearing medical masks for 4 h (T).

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Objectives: To examine how delivery time impacted on undergraduate nursing students' preparedness for evidence-based practice (EBP) by comparing the traditional semester mode and block mode of delivery models.

Methods: This two-group experimental study compared the traditional semester and block modes of delivery using a self-reported questionnaire. The factor of time was the variable in relation to learning with the block mode delivery being in a compressed timeframe.

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SARS-CoV-2 continues to pose a global threat, and current vaccines, while effective against severe illness, fall short in preventing transmission. To address this challenge, there's a need for vaccines that induce mucosal immunity and can rapidly control the virus. In this study, we demonstrate that a single immunization with a novel gorilla adenovirus-based vaccine (GRAd) carrying the pre-fusion stabilized Spike protein (S-2P) in non-human primates provided protective immunity for over one year against the BA.

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Waning immunity and continued virus evolution have limited the durability of protection from symptomatic infection mediated by intramuscularly (IM)-delivered mRNA vaccines against COVID-19 although protection from severe disease remains high. Mucosal vaccination has been proposed as a strategy to increase protection at the site of SARS-CoV-2 infection by enhancing airway immunity, potentially reducing rates of infection and transmission. Here, we compared protection against XBB.

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Gait speed is a simple, effective indicator of age-related disease and disability. We sought to examine the prevalence and trends of slow gait speed in older Americans. Our unweighted analytic sample included 12,427 adults aged ≥ 65 years from the 2006-2016 waves of the Health and Retirement Study.

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Introduction: Although the majority of growth hormone insensitivity syndrome (GHIS) cases are classical, the spectrum of clinical phenotypes has expanded to include "atypical" GHIS subjects with milder phenotypes due to very rare heterozygous growth hormone receptor (GHR) mutations with dominant negative effects.

Case Presentation: A 13-year-old pubertal boy presented with short stature (-1.7 SDS) and delayed bone age (11.

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Photosynthetic carbon (C) fixation by phytoplankton in the Southern Ocean (SO) plays a critical role in regulating air-sea exchange of carbon dioxide and thus global climate. In the SO, photosynthesis (PS) is often constrained by low iron, low temperatures, and low but highly variable light intensities. Recently, proton-pumping rhodopsins (PPRs) were identified in marine phytoplankton, providing an alternate iron-free, light-driven source of cellular energy.

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has a virulent protein called cystalysin, which causes periodontitis. Therefore, it is of interest to design efficient drug that may have fewer side effects than the present clinical drugs, considering most of them are multidrug resistant. The molecular docking analysis show that the selected thiazo derivatives (1-6) show better binding energies and amino acid interactions compared to the clinically proven drugs proving to be potential inhibitors against the protein.

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McGrath, R, FitzSimmons, S, Andrew, S, Black, K, Bradley, A, Christensen, BK, Collins, K, Klawitter, L, Kieser, J, Langford, M, Orr, M, and Hackney, KJ. Prevalence and trends of weakness among middle-aged and older adults in the United States. J Strength Cond Res 37(12): 2484-2490, 2023-Muscle weakness, which is often determined with low handgrip strength (HGS), is associated with several adverse health conditions; however, the prevalence and trends of weakness in the United States is not well-understood.

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