4,170 results match your criteria: "Arizona University[Affiliation]"

The frequency and severity of drought events are predicted to increase due to anthropogenic climate change, with cascading effects across forested ecosystems. Management activities such as forest thinning and prescribed burning, which are often intended to mitigate fire hazard and restore ecosystem processes, may also help promote tree resistance to drought. However, it is unclear whether these treatments remain effective during the most severe drought conditions or whether their impacts differ across environmental gradients.

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Article Synopsis
  • Carbon reserves in trees are influenced by past photosynthesis and can be dated using radiocarbon dating, allowing researchers to study their distribution and turnover.
  • A new process model was created to analyze how different tree species manage their carbon reserves, revealing that both young and old reserves coexist within a single tree and are significantly mixed.
  • Disturbances like drought, fire, and pests negatively affect reserve mixing and longevity, with older reserves showing notable age shifts after disturbances, suggesting that ecological variations across species play a critical role in reserve management.
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Studies across various pathogens highlight the importance of pathogen genetic differences in disease manifestation. In the human fungal pathogen Cryptococcus neoformans, sequence type (ST) associates with patient outcome. We performed a meta-analysis of four genomic studies and identified overlapping gene regions associated with virulence, suggesting the importance of these gene regions in cryptococcal disease in diverse clinical isolates.

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Climate warming can alleviate temperature and nutrient constraints on tree growth in boreal regions, potentially enhancing boreal productivity. However, in permafrost environments, warming also disrupts the physical foundation on which trees grow, leading to leaning trees or "drunken" forests. Tree leaning might reduce radial growth, undermining potential benefits of warming.

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Seismic imaging is one of the most powerful tools available for constraining the internal structure and composition of planetary bodies as well as enabling our understanding planetary evolution, geology, and distribution of natural resources. However, traditional seismic instrumentation can be heavy and voluminous, expensive, and/or difficult to rapidly deploy in large numbers. Distributed acoustic sensing (DAS) provides a promising new alternative given the ease of deployment, light weight and simplicity of fiber optic cables.

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Introduction: This study tests the hypothesis that self-reported somatic symptoms are associated with biomarkers of stress, including elevated blood pressure and suppressed immune function, among Shuar adults living in the Ecuadorian Amazon.

Methods: Research was conducted in three Shuar communities in the Upano Valley of the Ecuadorian Amazon and included the collection of biomarkers and a structured morbidity interview. Participants self-reported somatic symptoms such as headaches, body pain, fatigue, and other bodily symptoms.

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is a pathogenic yeast that is the causative agent of cryptococcal meningitis. While it is well known that the genotype of impacts patient outcomes, the reason for this association has not been well elucidated. In this study, we examined the relationship between two subpopulations in the sequence type 93 clade of : ST93A and ST93B.

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Emerging research into the human microbiome, an intricate ecosystem of microorganisms residing in and on our bodies, reveals that it plays a pivotal role in maintaining our health, highlighting the potential for microbiome-based interventions to prevent, diagnose, treat, and manage a myriad of diseases. The objective of this review is to highlight the importance of microbiome studies in enhancing our understanding of rare genetic epilepsy and related neurological disorders. Studies suggest that the gut microbiome, acting through the gut-brain axis, impacts the development and severity of epileptic conditions in children.

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: To investigate and identify different profiles of occupational burnout among Chinese nurses and explore how these burnout profiles moderate the relationship between the nursing work environment and perceived care quality. : Cross-sectional data retrieved from the Chinese Nursing Work Environment Survey (C-NWES) were used for analysis. Variables of interest included occupational burnout, the nursing work environment, nurses' perceived care quality, and demographic characteristics.

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Introduction: Globally, the health and quality of life of millions of people are negatively affected by diabetic foot ulcers (DFUs). To treat these chronic wounds, a novel injectable drug for closing DFUs composed of micronized amniotic membrane was developed. This new therapeutic drug for wound repair expands on traditional allograft therapies by allowing extracellular matrix proteins, growth factors, and cytokines to reach wound anatomies in DFUs that are difficult to treat.

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Background/objectives: Leptospirosis is a zoonotic disease that is widely distributed around the world and presents symptoms similar to other febrile illnesses in tropical regions, which complicates clinical diagnosis. This study aimed to evaluate the performance and agreement between serological diagnostic tests for detecting both acute and convalescent human leptospirosis, using the micro agglutination test (MAT) as a reference in an endemic region of the Colombian Caribbean.

Methods: A prospective descriptive study was conducted on 275 participants with suspected leptospirosis.

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Drivers of forest wildfire severity include fuels, topography and weather. However, because only fuels can be actively managed, quantifying their effects on severity has become an urgent research priority. Here we employed GEDI spaceborne lidar to consistently assess how pre-fire forest fuel structure affected wildfire severity across 42 California wildfires between 2019-2021.

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Coevolution between plants and their animal predators has led to diverse defensive adaptations. Multiple theories of defense propose that there are resource allocation costs associated with producing chemical defenses. One leading hypothesis, optimal defense theory (ODT), suggests that natural selection will result in the allocation of resources to defenses that optimize the cost-to-benefit ratio between defense and other functional processes.

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In water-limited dryland ecosystems of the Western United States, climate change is intensifying the impacts of heat, drought, and wildfire. Disturbances often lead to increased abundance of invasive species, in part, because dryland restoration and rehabilitation are inhibited by limited moisture and infrequent plant recruitment events. Information on ecological resilience to disturbance (recovery potential) and resistance to invasive species can aid in addressing these challenges by informing long-term restoration and conservation planning.

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Trust as Foundation: Can Nigeria's New Health Workforce Policy Stem the Migration Tide?

Int J Health Plann Manage

November 2024

Department of Politics and International Affairs, Northern Arizona University, Flagstaff, Arizona, USA.

Nigeria's 2024 National Policy on Health Workforce Migration confronts a fundamental challenge: rebuilding trust between healthcare workers and government. Using Mayer, Davis, and Schoorman's organizational trust framework, this analysis explores how trust shapes healthcare workers' migration decisions. Drawing from comparative African experiences and implementation evidence, this paper argues that without addressing core issues of trust through demonstrated policy implementation, sustained commitment to workforce welfare, and competitive compensation, even well-designed retention policies will struggle to retain Nigeria's health workers.

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As disturbance regimes change in response to anthropogenic activities, ecosystem resilience is critically important to the persistence of biodiversity and ecological functions. However, resilience in literature is often treated as an abstract concept, with widely varying definitions. Achieving common and reliable resilience metrics that cross systems and contexts remains elusive.

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Article Synopsis
  • A maximal apnoea poses significant challenges to the body, impacting arterial blood gases and requiring complex responses from multiple physiological systems like blood pressure and cerebral blood flow.
  • Previous research has largely concentrated on cardiovascular responses during maximal apnoea, with limited exploration into respiratory muscle responses and respiratory mechanics.
  • This review suggests that respiratory muscles may fatigue after maximal apnoea and proposes that elite divers may possess greater fatigue resistance, which could contribute to their success; it also highlights the need for further studies on the long-term health effects of apnoea diving.
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West Nile virus is a mosquito-borne illness that usually presents as asymptomatic or with a viral syndrome, and normally is treated with supportive care or immunotherapy. However, some patients can develop neurologic symptoms of viral meningoencephalitis. This article describes a patient who developed opsomyoclonus, a rare complication of West Nile virus meningoencephalitis.

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Thriving Through Adaptation: Adaptive Sports after Spinal Cord Injury.

Phys Med Rehabil Clin N Am

February 2025

Spinal Cord Injury Program, Shepherd Center, 2020 Peachtree Road Northwest, Atlanta, GA 30309, USA.

This article focuses on identifying how health care providers can support a person with spinal cord injury to pursue and maintain involvement in adaptive sports. Benefits and barriers of sport participation, equipment considerations, and recommendations on how to determine sport appropriateness for a person with spinal cord injury will be provided. The authors emphasize through appropriate medical management and consideration of level of disability, functional performance, psychological readiness, and individual preference, a health care provider can play a valuable role in connecting individuals with spinal cord injury to adaptive sports and recreation.

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This pilot study investigated the feasibility and efficacy of using autonomous ankle exoskeletons in community settings among individuals with cerebral palsy (CP). Five participants completed two structured community walking protocols: a week-long ankle exoskeleton acclimation and training intervention, and a dose-matched Sham intervention of unassisted walking. Results demonstrated significant improvements in acclimatized walking performance with the ankle exoskeleton, including increased speed and stride length.

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Maximal static dry, that is, on land, apneas (breath-holds) result in severe hypoxemia and hypercapnia and have easy-going and struggle phases. During the struggle phase, the respiratory muscles involuntarily contract against the closed glottis in increasing frequency and magnitude, that is, involuntary breathing movements (IBMs). IBMs during maximal static apnea have been suggested to fatigue respiratory muscles, but this has yet to be measured.

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Background: There is growing interest in the use of biofeedback-augmented gait training in cerebral palsy (CP). Audiovisual, sensorimotor, and immersive biofeedback paradigms are commonly used to elicit short-term gait improvements; however, outcomes remain variable. Because biofeedback training requires that individuals have the capacity to both adapt their gait in response to feedback and retain improvements across sessions, changes in either capacity may affect outcomes.

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Effect of a Whole-Food Plant-Based Diet on Postprandial Sleepiness: A Pilot Study.

Am J Lifestyle Med

June 2024

Division of Allergy, Pulmonary and Sleep Medicine, Mayo Clinic, Jacksonville, FL, USA (AP, JC).

Background: Postprandial sleepiness refers to the state of excessive drowsiness that occurs after consuming a meal. This transient phenomenon is experienced by many individuals, often leading to decreased productivity and impaired cognitive performance. This study examined the effect of a whole-food plant-based (WFPB) diet on postprandial sleepiness.

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Depression is a global health concern, with various treatments available. In this study, participants (n = 430) were self-selected or medically referred to a residential lifestyle program at the Black Hills Health & Education Center (BHHEC), with a mean stay of 19 days. Individualized treatment plans included structured physical activity sessions, counseling sessions, and the provision of a vegan diet.

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