Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 82
Filtrar
Más filtros

Tipo del documento
Intervalo de año de publicación
1.
Med Teach ; : 1-7, 2024 Jun 04.
Artículo en Inglés | MEDLINE | ID: mdl-38833017

RESUMEN

INTRODUCTION: Accreditation of medical education programs can be observed from different perspectives. Regulatory/accreditation agencies consider it vital to assure a certain level of quality. Other stakeholders may perceive the accreditation process as a negative experience, draining resources, and efforts. Although accreditation may improve the program's governance and administration, its direct or indirect impact on students must be further investigated. This study explores the relationship between the occurrence of accreditation site visits and student satisfaction rates at Avalon University School of Medicine. METHODS: A comparison study was conducted with retrospective satisfaction data from two accreditation cycles at AUSOM. We used the Caribbean Accreditation Authority for Education in Medicine and Other Health Professions (CAAM-HP) student surveys for data collection, and data from 2017, 2019, and 2022 were used. The response rate was 70% (n = 71), 72% (n = 47), and 60% (n = 56) for basic science students and 80% (n = 111), 82% (n = 115), and 70% (n = 76) for clinical students in 2017, 2019, and 2022, respectively. The survey for basic sciences students included 37 questions/items, and the survey for clinical students included 39 questions/items. The responses for the questionnaire were on the five-point Likert scale. The retrospective data were evaluated using the unpaired Wilcoxon-rank sum test. RESULTS: The ratings for the basic science students' survey increased from 2017 to 2019 (first accreditation cycle) only for 11 items/questions and they were increased from 2019 to 2022 for all items/questions. The ratings for clinical science students' surveys increased from 2017 to 2019 (the first accreditation cycle) for all items/questions with a statistically significant p-value. They increased for 28 questions/items from 2019 to 2022, and two items (availability and adequacy of career counseling) showed statistically significant p-values. CONCLUSIONS: The pre-accreditation preparation and the self-evaluation process while correcting the program's deficiencies are essential triggers for the quality improvement process associated with accreditation.

2.
Environ Microbiol ; 25(4): 880-893, 2023 04.
Artículo en Inglés | MEDLINE | ID: mdl-36594240

RESUMEN

Microbial mortality impacts the structure of food webs, carbon flow, and the interactions that create dynamic patterns of abundance across gradients in space and time in diverse ecosystems. In the oceans, estimates of microbial mortality by viruses, protists, and small zooplankton do not account fully for observations of loss, suggesting the existence of underappreciated mortality sources. We examined how ubiquitous mucous mesh feeders (i.e. gelatinous zooplankton) could contribute to microbial mortality in the open ocean. We coupled capture of live animals by blue-water diving to sequence-based approaches to measure the enrichment and selectivity of feeding by two coexisting mucous grazer taxa (pteropods and salps) on numerically dominant marine prokaryotes. We show that mucous mesh grazers consume a variety of marine prokaryotes and select between coexisting lineages and similar cell sizes. We show that Prochlorococcus may evade filtration more than other cells and that planktonic archaea are consumed by macrozooplanktonic grazers. Discovery of these feeding relationships identifies a new source of mortality for Earth's dominant marine microbes and alters our understanding of how top-down processes shape microbial community and function.


Asunto(s)
Ecosistema , Plancton , Animales , Océanos y Mares , Zooplancton , Células Procariotas
3.
Adv Health Sci Educ Theory Pract ; 28(3): 911-937, 2023 08.
Artículo en Inglés | MEDLINE | ID: mdl-36538278

RESUMEN

In recent years, health professions researchers have suggested that a dual identity that includes both a professional and interprofessional identity is essential to interprofessionality. This scoping review sought to describe the learning experiences that may support the development of an interprofessional identity, providing direction for future research. A scoping review was conducted to identify papers published between 2000 and 2020 that provided empiric evidence to support the impact of planned or spontaneous learning experiences involving two or more healthcare professions that fostered the development of an "interprofessional identity," or a sense of belonging to an interprofessional community. Twelve papers were identified for inclusion. Articles varied regarding both the professional groups studied and the developmental levels of their participants. A wide variety of learning experiences were described in the identified studies, including designed activities and programs, as well as those occurring spontaneously in authentic clinical environments. Examples of longitudinal and integrated programs were also identified. The construct of an interprofessional identity and its potential impact on interprofessional practice has yet to be sufficiently studied. The results of this scoping review suggest that a variety of experiences that occur throughout the professional development trajectory may foster an interprofessional identity. Longitudinal, integrated interprofessional learning programs may result in a more long-lasting impact on interprofessional identity and these types of programs should be the focus of future research.


Asunto(s)
Relaciones Interprofesionales , Aprendizaje , Humanos , Empleos en Salud
4.
Clin Rehabil ; 37(1): 47-59, 2023 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-36163694

RESUMEN

OBJECTIVE: To test the feasibility of a walking programme for community-dwelling adults recovering from hip fracture. DESIGN: A randomized controlled trial with embedded qualitative analysis. SETTING: Community. PARTICIPANTS: Aged at least 60 years and living in the community after hip fracture. INTERVENTIONS: In addition to standard care, the experimental group received weekly home-based physiotherapy for 12 weeks to facilitate 100 minutes/week of moderate-intensity walking. MAIN OUTCOME MEASURES: Feasibility domains of demand, acceptability, implementation, practicality and limited efficacy. RESULTS: Of 158 potentially eligible, 38 participated (23 women, mean age 80 years, SD 9). The recruitment rate of 24% indicated low demand. Participants considered the walking programme highly acceptable. The programme was implemented as intended; the experimental group received a mean of 11 (SD 1) consultations and averaged more than 100 min of walking per week. The programme was practical with no serious adverse events and no between-group difference in risk of falling or hospital readmissions. Demonstrating evidence of efficacy, there were moderate standardized mean differences for physical activity favouring the experimental group, who increased daily moderate-intensity physical activity compared to the control group (MD 8 min, 95% CI 2-13). There were no between-group differences in mobility, walking confidence or quality of life. CONCLUSION: A walking programme for community-dwelling older adults after hip fracture was acceptable, could be implemented as intended and was practical and demonstrated preliminary evidence of efficacy in increasing physical activity. However, low demand would threaten the feasibility of such a programme.


Asunto(s)
Fracturas de Cadera , Calidad de Vida , Humanos , Femenino , Anciano , Anciano de 80 o más Años , Estudios de Factibilidad , Caminata , Ejercicio Físico
5.
Health Commun ; 38(7): 1442-1453, 2023 06.
Artículo en Inglés | MEDLINE | ID: mdl-34965825

RESUMEN

The current study utilizes Hawkley, Cacioppo, and colleagues' model of loneliness and health to examine the influence of parent-child relationships on the health of incarcerated women. Participants were 121 incarcerated female adults who have at least one child, and who completed a questionnaire with measures of parental involvement, parent-child closeness, loneliness, overall health, physical functioning, depression, and anxiety. Results reveal that among incarcerated women, perceptions of close and involved relationships with their children were associated with less loneliness, and less loneliness was associated with better overall health and physical functioning, as well as lower depression and anxiety. Findings highlight the importance of including loneliness in studies that examine the impact of parent-child relationships on health, especially for this vulnerable population, and suggest that it is worthwhile to engage in efforts to help incarcerated women maintain close and involved relationships with their children through high-quality communication.


Asunto(s)
Madres , Prisioneros , Adulto , Humanos , Femenino , Soledad , Relaciones Padres-Hijo , Padres
6.
J Interprof Care ; 37(5): 807-817, 2023 Sep 03.
Artículo en Inglés | MEDLINE | ID: mdl-35880763

RESUMEN

Electronic learning (e-learning) for continuing professional education (CPE) in healthcare has been shown to improve learners' satisfaction, attitudes, and performance. E-learning outcomes for continuing interprofessional education (CIPE) are less known, and the features of electronic CIPE programs that promote behavior change are unclear. In this scoping review, we sought to identify the program features and areas of behavior change in healthcare professionals using e-learning for CIPE. PubMed, CINAHL, ERIC, PsycINFO, Cochrane Library databases, and Google/Google Scholar were searched for all English articles published in the last 10 years. From the 32 studies included in our review, eight types of e-learning methods were identified. More than 35,542 healthcare professionals of different professions had participated in the programs. Thirty studies demonstrated positive behavior changes, with four areas of behavior changes identified. The most common area of change was in patient care practices. Five common program features facilitating behavior change were also identified. Most successful programs provided interactive and authentic learning experiences, which promoted direct clinical application. Future researche should include monitoring of sustained behavior changes at work, linked to patient outcomes.


Asunto(s)
Educación Interprofesional , Relaciones Interprofesionales , Humanos , Atención a la Salud , Aprendizaje
7.
Int J Qual Health Care ; 34(4)2022 Dec 08.
Artículo en Inglés | MEDLINE | ID: mdl-36373866

RESUMEN

BACKGROUND: Outsourcing health-care services has become popular globally, provided by both profit and non-for-profit organizations with varying degrees of quality. To date, few published studies have evaluated the quality of care in health services using outsourcing. OBJECTIVE: The purpose of this study was to determine if there were differences in quality of care (effectiveness, safety and patient experience) for a Transition Care Program designed to improve older people's independence and confidence after a hospital stay, when provided within a public health network compared to being outsourced to private facilities. METHODS: For clients discharged to a residential Transition Care Program operating across three sites from a large health service network (n = 1546), an audit of medical records was completed. Site 1 remained within the public health service (internally managed), whereas Sites 2 and 3 involved outsourcing to residential aged care facilities. The main outcome measures were discharge destination, length of stay and number of falls. Client demographics were analysed descriptively, and inferential statistics for continuous data and negative binomial regression for event data were used to examine differences between the sites. RESULTS: There were differences in quality of care between the internally and outsourced managed sites. One outsourced site discharged a smaller proportion to rehabilitation (P = 0.003) compared to the other two sites. There were differences in length of stay between the three sites. The length of stay was a mean of 4.8 days less at Site 1 (internally managed) (95% Confidence Interval (CI) 0.5 to 9.1) than Site 2 and 4.6 days less (95% CI 1.2 to 8.1) than Site 3. For those discharged to permanent residential care, the length of stay was 9.4 days less at the internal site than Site 2 (95% CI 3.5 to 15.2) and 7.0 days less than Site 3 (95% CI 1.9 to 12). Additionally, a lower rate of falls was recorded at Site 1 (internally managed) compared to Site 2 (outsourced) (incidence rate ratio = 0.44 (95% CI 0.32 to 0.60), P < 0.001). CONCLUSION: An internally managed Transition Care Program in a public health network was associated with better quality of care outcomes compared to outsourced services.


Asunto(s)
Servicios Externos , Anciano , Humanos , Calidad de la Atención de Salud
8.
Geophys Res Lett ; 48(5): e2020GL091987, 2021 Mar 16.
Artículo en Inglés | MEDLINE | ID: mdl-33785974

RESUMEN

Throughout spring and summer 2020, ozone stations in the northern extratropics recorded unusually low ozone in the free troposphere. From April to August, and from 1 to 8 kilometers altitude, ozone was on average 7% (≈4 nmol/mol) below the 2000-2020 climatological mean. Such low ozone, over several months, and at so many stations, has not been observed in any previous year since at least 2000. Atmospheric composition analyses from the Copernicus Atmosphere Monitoring Service and simulations from the NASA GMI model indicate that the large 2020 springtime ozone depletion in the Arctic stratosphere contributed less than one-quarter of the observed tropospheric anomaly. The observed anomaly is consistent with recent chemistry-climate model simulations, which assume emissions reductions similar to those caused by the COVID-19 crisis. COVID-19 related emissions reductions appear to be the major cause for the observed reduced free tropospheric ozone in 2020.

9.
Mol Syst Biol ; 13(3): 919, 2017 03 20.
Artículo en Inglés | MEDLINE | ID: mdl-28320772

RESUMEN

Managing trade-offs through gene regulation is believed to confer resilience to a microbial community in a fluctuating resource environment. To investigate this hypothesis, we imposed a fluctuating environment that required the sulfate-reducer Desulfovibrio vulgaris to undergo repeated ecologically relevant shifts between retaining metabolic independence (active capacity for sulfate respiration) and becoming metabolically specialized to a mutualistic association with the hydrogen-consuming Methanococcus maripaludis Strikingly, the microbial community became progressively less proficient at restoring the environmentally relevant physiological state after each perturbation and most cultures collapsed within 3-7 shifts. Counterintuitively, the collapse phenomenon was prevented by a single regulatory mutation. We have characterized the mechanism for collapse by conducting RNA-seq analysis, proteomics, microcalorimetry, and single-cell transcriptome analysis. We demonstrate that the collapse was caused by conditional gene regulation, which drove precipitous decline in intracellular abundance of essential transcripts and proteins, imposing greater energetic burden of regulation to restore function in a fluctuating environment.


Asunto(s)
Desulfovibrio vulgaris/crecimiento & desarrollo , Methanococcus/crecimiento & desarrollo , Biología de Sistemas/métodos , Desulfovibrio vulgaris/genética , Evolución Molecular Dirigida , Perfilación de la Expresión Génica , Methanococcus/genética , Oxidación-Reducción , Fenotipo , Proteómica , Análisis de Secuencia de ARN , Análisis de la Célula Individual , Sulfatos/metabolismo
10.
Pediatr Crit Care Med ; 19(3): 218-227, 2018 03.
Artículo en Inglés | MEDLINE | ID: mdl-29252865

RESUMEN

OBJECTIVES: Evaluate differences in tracheal intubation-associated events and process variances (i.e., multiple intubation attempts and oxygen desaturation) between pediatric cardiac ICUs and noncardiac PICUs in children with underlying cardiac disease. DESIGN: Retrospective cohort study using a multicenter tracheal intubation quality improvement database (National Emergency Airway Registry for Children). SETTING: Thirty-six PICUs (five cardiac ICUs, 31 noncardiac ICUs) from July 2012 to March 2016. PATIENTS: Children with medical or surgical cardiac disease who underwent intubation in an ICU. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Our primary outcome was the rate of any adverse tracheal intubation-associated event. Secondary outcomes were severe tracheal intubation-associated events, multiple tracheal intubation attempt rates, and oxygen desaturation. There were 1,502 tracheal intubations in children with underlying cardiac disease (751 in cardiac ICUs, 751 in noncardiac ICUs) reported. Cardiac ICUs and noncardiac ICUs had similar proportions of patients with surgical cardiac disease. Patients undergoing intubation in cardiac ICUs were younger (median age, 1 mo [interquartile range, 0-6 mo]) compared with noncardiac ICUs (median 3 mo [interquartile range, 1-11 mo]; p < 0.001). Tracheal intubation-associated event rates were not different between cardiac ICUs and noncardiac ICUs (16% vs 19%; adjusted odds ratio, 0.74; 95% CI, 0.54-1.02; p = 0.069). However, in a sensitivity analysis comparing cardiac ICUs with mixed ICUs (i.e., ICUs caring for children with either general pediatric or cardiac diseases), cardiac ICUs had decreased odds of adverse events (adjusted odds ratio, 0.71; 95% CI, 0.52-0.97; p = 0.033). Rates of severe tracheal intubation-associated events and multiple attempts were similar. Desaturations occurred more often during intubation in cardiac ICUs (adjusted odds ratio, 1.61; 95% CI, 1.04-1.15; p = 0.002). CONCLUSIONS: In children with underlying cardiac disease, rates of adverse tracheal intubation-associated events were not lower in cardiac ICUs as compared to noncardiac ICUs, even after adjusting for differences in patient characteristics and care models.


Asunto(s)
Enfermedad Crítica/terapia , Cardiopatías/terapia , Unidades de Cuidado Intensivo Pediátrico/estadística & datos numéricos , Intubación Intratraqueal/efectos adversos , Pautas de la Práctica en Medicina/estadística & datos numéricos , Adolescente , Niño , Preescolar , Estudios de Cohortes , Bases de Datos Factuales , Femenino , Humanos , Lactante , Recién Nacido , Intubación Intratraqueal/estadística & datos numéricos , Masculino , Oximetría/estadística & datos numéricos , Mejoramiento de la Calidad , Estudios Retrospectivos
12.
Cardiol Young ; 28(7): 928-937, 2018 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-29690950

RESUMEN

IntroductionChildren with CHD and acquired heart disease have unique, high-risk physiology. They may have a higher risk of adverse tracheal-intubation-associated events, as compared with children with non-cardiac disease.Materials and methodsWe sought to evaluate the occurrence of adverse tracheal-intubation-associated events in children with cardiac disease compared to children with non-cardiac disease. A retrospective analysis of tracheal intubations from 38 international paediatric ICUs was performed using the National Emergency Airway Registry for Children (NEAR4KIDS) quality improvement registry. The primary outcome was the occurrence of any tracheal-intubation-associated event. Secondary outcomes included the occurrence of severe tracheal-intubation-associated events, multiple intubation attempts, and oxygen desaturation. RESULTS: A total of 8851 intubations were reported between July, 2012 and March, 2016. Cardiac patients were younger, more likely to have haemodynamic instability, and less likely to have respiratory failure as an indication. The overall frequency of tracheal-intubation-associated events was not different (cardiac: 17% versus non-cardiac: 16%, p=0.13), nor was the rate of severe tracheal-intubation-associated events (cardiac: 7% versus non-cardiac: 6%, p=0.11). Tracheal-intubation-associated cardiac arrest occurred more often in cardiac patients (2.80 versus 1.28%; p<0.001), even after adjusting for patient and provider differences (adjusted odds ratio 1.79; p=0.03). Multiple intubation attempts occurred less often in cardiac patients (p=0.04), and oxygen desaturations occurred more often, even after excluding patients with cyanotic heart disease. CONCLUSIONS: The overall incidence of adverse tracheal-intubation-associated events in cardiac patients was not different from that in non-cardiac patients. However, the presence of a cardiac diagnosis was associated with a higher occurrence of both tracheal-intubation-associated cardiac arrest and oxygen desaturation.


Asunto(s)
Paro Cardíaco/epidemiología , Unidades de Cuidado Intensivo Pediátrico , Intubación Intratraqueal/efectos adversos , Niño , Preescolar , Femenino , Paro Cardíaco/prevención & control , Humanos , Incidencia , Lactante , Recién Nacido , Modelos Logísticos , Masculino , Mejoramiento de la Calidad/organización & administración , Sistema de Registros , Estudios Retrospectivos , Factores de Riesgo
13.
Environ Microbiol ; 19(8): 3059-3069, 2017 08.
Artículo en Inglés | MEDLINE | ID: mdl-28419704

RESUMEN

Microbial populations can withstand, overcome and persist in the face of environmental fluctuation. Previously, we demonstrated how conditional gene regulation in a fluctuating environment drives dilution of condition-specific transcripts, causing a population of Desulfovibrio vulgaris Hildenborough (DvH) to collapse after repeatedly transitioning from sulfate respiration to syntrophic conditions with the methanogen Methanococcus maripaludis. Failure of the DvH to successfully transition contributed to the collapse of this model community. We investigated the mechanistic basis for loss of robustness by examining whether conditional gene regulation altered heterogeneity in gene expression across individual DvH cells. We discovered that robustness of a microbial population across environmental transitions was attributable to the retention of cells in two states that exhibited different condition-specific gene expression patterns. In our experiments, a population with disrupted conditional regulation successfully alternated between cell states. Meanwhile, a population with intact conditional regulation successfully switched between cell states initially, but collapsed after repeated transitions, possibly due to the high energy requirements of regulation. These results demonstrate that the survival of this entire model microbial community is dependent on the regulatory system's influence on the distribution of distinct cell states among individual cells within a clonal population.


Asunto(s)
Desulfovibrio vulgaris/crecimiento & desarrollo , Methanococcus/crecimiento & desarrollo , Consorcios Microbianos/fisiología , Interacciones Microbianas/fisiología , Desulfovibrio vulgaris/genética , Metabolismo Energético/fisiología , Oxidación-Reducción , Sulfatos/metabolismo
14.
Geophys Res Lett ; 43(5): 2249-2258, 2016 Mar 16.
Artículo en Inglés | MEDLINE | ID: mdl-29618849

RESUMEN

A Comprehensive Air-Quality Model with Extensions (CAMx) version 6.10 simulation was assessed through comparison with data acquired during NASA's 2011 DISCOVER-AQ Maryland field campaign. Comparisons for the baseline simulation (CB05 chemistry, EPA 2011 National Emissions Inventory) show a model overestimate of NOy by +86.2% and an underestimate of HCHO by -28.3%. We present a new model framework (CB6r2 chemistry, MEGAN v2.1 biogenic emissions, 50% reduction in mobile NOx, enhanced representation of isoprene nitrates) that better matches observations. The new model framework attributes 31.4% more surface ozone in Maryland to electric generating units (EGUs) and 34.6% less ozone to on-road mobile sources. Surface ozone becomes more NOx-limited throughout the eastern United States compared to the baseline simulation. The baseline model therefore likely underestimates the effectiveness of anthropogenic NOx reductions as well as the current contribution of EGUs to surface ozone.

15.
Mol Genet Metab ; 114(2): 217-25, 2015 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-25092414

RESUMEN

Recombinant human acid sphingomyelinase (rhASM) is being developed as an enzyme replacement therapy for patients with acid sphingomyelinase deficiency (Niemann-Pick disease types A and B), which causes sphingomyelin to accumulate in lysosomes. In the acid sphingomyelinase knock-out (ASMKO) mouse, intravenously administered rhASM reduced tissue sphingomyelin levels in a dose-dependent manner. When rhASM was administered to normal rats, mice, and dogs, no toxicity was observed up to a dose of 30mg/kg. However, high doses of rhASM≥10mg/kg administered to ASMKO mice resulted in unexpected toxicity characterized by cardiovascular shock, hepatic inflammation, adrenal hemorrhage, elevations in ceramide and cytokines (especially IL-6, G-CSF, and keratinocyte chemoattractant [KC]), and death. The toxicity could be completely prevented by the administration of several low doses (3mg/kg) of rhASM prior to single or repeated high doses (≥20mg/kg). These results suggest that the observed toxicity involves the rapid breakdown of large amounts of sphingomyelin into ceramide and/or other toxic downstream metabolites, which are known signaling molecules with cardiovascular and pro-inflammatory effects. Our results suggest that the nonclinical safety assessment of novel therapeutics should include the use of specific animal models of disease whenever feasible.


Asunto(s)
Perros , Terapia de Reemplazo Enzimático , Enfermedad de Niemann-Pick Tipo A/tratamiento farmacológico , Esfingomielina Fosfodiesterasa/administración & dosificación , Esfingomielina Fosfodiesterasa/deficiencia , Administración Intravenosa , Glándulas Suprarrenales , Animales , Ceramidas/sangre , Ceramidas/metabolismo , Citocinas/sangre , Citocinas/inmunología , Modelos Animales de Enfermedad , Evaluación Preclínica de Medicamentos , Femenino , Hígado/metabolismo , Hígado/patología , Lisosomas/metabolismo , Macaca fascicularis , Masculino , Ratones , Ratones Endogámicos C57BL , Ratones Noqueados , Enfermedad de Niemann-Pick Tipo A/metabolismo , Ratas , Proteínas Recombinantes/administración & dosificación , Proteínas Recombinantes/toxicidad , Esfingomielina Fosfodiesterasa/toxicidad , Esfingomielinas/metabolismo
16.
Environ Microbiol ; 16(10): 3238-49, 2014 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-24761991

RESUMEN

Symbiotic interactions between nitrogen-fixing prokaryotes and photosynthetic eukaryotes are an integral part of biological nitrogen fixation at a global scale. One of these partnerships involves the cyanobacterium UCYN-A, which has been found in partnership with an uncultivated unicellular prymnesiophyte alga in open-ocean and coastal environments. Phylogenetic analysis of the UCYN-A nitrogenase gene (nifH) showed that the UCYN-A lineage is represented by three distinct clades, referred to herein as UCYN-A1, UCYN-A2 and UCYN-A3, which appear to have overlapping and distinct geographic distributions. The relevance of UCYN-A's genetic diversity to its symbiosis and ecology was explored through combining flow cytometric cell sorting and molecular techniques to determine the host identity, nifH expression patterns and host cell size of one newly discovered clade, UCYN-A2, at a coastal site. UCYN-A2 nifH expression peaked during daylight hours, which is consistent with expression patterns of the UCYN-A1 clade in the open ocean. However, the cell size of the UCYN-A2 host was significantly larger than UCYN-A1 and host, suggesting adaptation to different environmental conditions. Like the UCYN-A1 host, the UCYN-A2 host was closely related to the genus Braarudosphaera; however, the UCYN-A1 and UCYN-A2 host rRNA sequences clustered into two distinct clades suggesting co-evolution of symbiont and host.


Asunto(s)
Cianobacterias/clasificación , Cianobacterias/genética , Variación Genética , Haptophyta/microbiología , Simbiosis/genética , Cianobacterias/enzimología , Fijación del Nitrógeno/genética , Oxidorreductasas/clasificación , Oxidorreductasas/genética , Filogenia
17.
Am J Physiol Heart Circ Physiol ; 307(4): H533-41, 2014 Aug 15.
Artículo en Inglés | MEDLINE | ID: mdl-24973384

RESUMEN

Loss of vascular smooth muscle cell (VSMC) function is a hallmark of vascular disease. VSMCs become increasingly dysregulated, apoptotic, and senescent as we age. Sirtuin 1 (SirT1) is a deactylase that regulates substrates associated with stress mitigation, metabolism, and aging. Our aim was to examine the role of SirT1 in vascular aging and the function this protein plays in the context of cellular response to stress and senescence. We compared endogenous SirT1 expression in young and old human donors. Human VSMC (HuVSMC) from donors ranging in age from 12 to 88 (n = 14) were isolated and cultured. In cultured HuVSMC the levels of endogenous SirT1 were examined by Western blot analysis. We found that endogenous SirT1 protein expression inversely correlated with donor age. Additionally, we demonstrated that age-related loss of SirT1 correlated in functional deficits, diminished stress response, reduced capacity for migration, and proliferation and increased senescence. Manipulation of SirT1 levels in young cells confirmed the role of SirT1 in cellular migration and proliferation capability. Furthermore, we demonstrated that age-related loss of SirT1 was associated with the induction of VSMC senescence. With correlation to symptomatic disease, we demonstrated a significant difference in SirT1 levels from HuVSMC isolated from aged arteries that were occluded with atherosclerotic lesions (n = 7), compared with patent sections of the same artery. Having demonstrated that endogenous SirT1 is lost with age, which correlates with a loss of capacity for vascular repair, our data explain one of the molecular changes that occurs in the aged vasculature.


Asunto(s)
Senescencia Celular , Regulación del Desarrollo de la Expresión Génica , Músculo Liso Vascular/metabolismo , Miocitos del Músculo Liso/metabolismo , Sirtuina 1/metabolismo , Adolescente , Adulto , Factores de Edad , Anciano , Anciano de 80 o más Años , Movimiento Celular , Proliferación Celular , Células Cultivadas , Niño , Humanos , Persona de Mediana Edad , Músculo Liso Vascular/crecimiento & desarrollo , Músculo Liso Vascular/fisiología , Miocitos del Músculo Liso/fisiología , Sirtuina 1/genética
18.
MedEdPublish (2016) ; 14: 13, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38800136

RESUMEN

Background: Accreditation in medical education has existed for more than 100 years, yet the impact of accreditation remains inconclusive. Some studies have shown the effects of accreditation on student outcomes and educational processes at medical schools. However, evidence showing the impact of accreditation on continuous quality improvement of undergraduate medical education programs is still in its infancy. This scoping review explores the impact of accreditation on continuous quality improvement (CQI). Methods: This scoping review followed the methodology of the Preferred Reporting Items of Systematic Reviews and the Meta-Analysis extension for scoping reviews (PRISMA-ScR) checklist outlined by Arksey and O'Malley (2005). Databases, including PubMed, Medline, ERIC, CINHAL, and Google Scholar, were searched to find articles from 2000 to 2022 related to the accreditation of undergraduate medical education programs and continuous quality improvement. Results: A total of 35 full-text articles were reviewed, and ten articles met our inclusion criteria. The review of the full-text articles yielded four themes: Accreditation and its standards in general, Accreditation and its impact on student outcomes, Accreditation and its impact on medical school's educational processes, Accreditation and CQI. However, the literature evidence suggesting the impact of accreditation on CQI is minimal. The quality assurance approach is based on meeting the standards of accreditation. The quality improvement approach is based on striving for excellence. Literature suggests a requirement to move from student outcomes to CQI measures. CQI requires everyone in the organization to take responsibility and accountability, considering quality as the result of every single step or process and leaders supporting improvements in data collection and data analysis for quality improvement. Conclusions: The literature on accreditation and CQI are limited in number. More research studies are required to enhance undergraduate medical education accreditation practices' value to medical students, educators, academic leaders, programs, and the public. It was recommended that medical schools embrace the culture and vision perpetuated by the CQI process.

19.
PNAS Nexus ; 3(3): pgae091, 2024 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-38505693

RESUMEN

The mechanism of mortality plays a large role in how microorganisms in the open ocean contribute to global energy and nutrient cycling. Salps are ubiquitous pelagic tunicates that are a well-known mortality source for large phototrophic microorganisms in coastal and high-latitude systems, but their impact on the immense populations of smaller prokaryotes in the tropical and subtropical open ocean gyres is not well quantified. We used robustly quantitative techniques to measure salp clearance and enrichment of specific microbial functional groups in the North Pacific Subtropical Gyre, one of the largest ecosystems on Earth. We discovered that salps are a previously unknown predator of the globally abundant nitrogen fixer Crocosphaera; thus, salps restrain new nitrogen delivery to the marine ecosystem. We show that the ocean's two numerically dominant cells, Prochlorococcus and SAR11, are not consumed by salps, which offers a new explanation for the dominance of small cells in open ocean systems. We also identified a double bonus for Prochlorococcus, wherein it not only escapes salp predation but the salps also remove one of its major mixotrophic predators, the prymnesiophyte Chrysochromulina. When we modeled the interaction between salp mesh and particles, we found that cell size alone could not account for these prey selection patterns. Instead, the results suggest that alternative mechanisms, such as surface property, shape, nutritional quality, or even prey behavior, determine which microbial cells are consumed by salps. Together, these results identify salps as a major factor in shaping the structure, function, and ecology of open ocean microbial communities.

20.
BMJ Lead ; 2023 Oct 27.
Artículo en Inglés | MEDLINE | ID: mdl-37890988

RESUMEN

INTRODUCTION: Academic medical centres (AMCs) have the tripartite mission of performing research to advance healthcare delivery, educating future clinicians and providing healthcare services. This study investigates the criteria associated with being promoted in a Singaporean AMC. METHODS: Using a dataset of 255 candidates for promotion at the studied AMC, we employ logistic regression to determine if these factors are associated with the likelihood of promotion. Further, we use interaction effects to test if the relationship between the H-index and likelihood of promotion differs across the academic levels of the candidates. RESULTS: The logistic regression results based on the best of our three tested models suggest that the H-index is positively associated with promotion for those applying to become clinical associate professors (OR=1.43, p=0.01). Moreover, candidates who provide well-developed education portfolios (OR=3.61, p=0.02) and who have held service/leadership roles (OR=6.72, p<0.001) are more likely to be promoted. CONCLUSIONS: This study affirms the correlation between promotion and the advancement criteria outlined by the AMC. This is important for transparency and trust between the AMC and its faculty in their applications for promotion and success in an academic career. Further, our study is one of the few empirical studies linking promotion criteria to promotion outcomes.

SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA