Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 61
Filtrar
1.
Pilot Feasibility Stud ; 9(1): 192, 2023 Nov 24.
Artículo en Inglés | MEDLINE | ID: mdl-38001523

RESUMEN

BACKGROUND: Despite family carepartners of individuals post-stroke experiencing high levels of strain and reduced quality of life, stroke rehabilitation interventions rarely address carepartner well-being or offer training to support their engagement in therapeutic activities. Our group has developed creative intervention approaches to support families during stroke recovery, thereby improving physical and psychosocial outcomes for both carepartners and stroke survivors. The purpose of this study is to test the feasibility of an adapted, home-based intervention (Carepartner Collaborative Integrative Therapy for Gait-CARE-CITE-Gait) designed to facilitate positive carepartner involvement during home-based training targeting gait and mobility. METHODS: This two-phased design will determine the feasibility of CARE-CITE-Gait, a novel intervention that leverages principles from our previous carepartner-focused upper extremity intervention. During the 4-week CARE-CITE-Gait intervention, carepartners review online video-based modules designed to illustrate strategies for an autonomy-supportive environment during functional mobility task practice, and the study team completes two 2-h home visits for dyad collaborative goal setting. In phase I, content validity, usability, and acceptability of the CARE-CITE-Gait modules will be evaluated by stroke rehabilitation content experts and carepartners. In phase II, feasibility (based on measures of recruitment, retention, intervention adherence, and safety) will be measured. Preliminary effects of the CARE-CITE-Gait will be gathered using a single-group, quasi-experimental design with repeated measures (two baseline visits 1 week apart, posttest, and 1-month follow-up) with 15 carepartner and stroke survivor dyads. Outcome data collectors will be blinded. Outcomes include psychosocial variables (family conflict surrounding stroke recovery, strain, autonomy support, and quality of life) collected from carepartners and measures of functional mobility, gait speed, stepping activity, and health-related quality of life collected from stroke survivors. DISCUSSION: The findings of the feasibility testing and preliminary data on the effects of CARE-CITE-Gait will provide justification and information to guide a future definitive randomized clinical trial. The knowledge gained from this study will enhance our understanding of and aid the development of rehabilitation approaches that address both carepartner and stroke survivor needs during the stroke recovery process. TRIAL REGISTRATION: ClinicalTrials.gov, NCT05257928. Registered 25 February 2022. TRIAL STATUS: This trial was registered on ClinicalTrials.gov (NCT05257928) on March 25, 2022. Recruitment of participants was initiated on May 18, 2022.

2.
Home Healthc Now ; 41(3): 149-157, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37144930

RESUMEN

Conducting research in the home environment presents challenges related to setting, study participants, methods, and researchers. Researchers should be aware of potential challenges to ensure rigor and improve planning for future studies. This paper describes difficulties experienced and lessons learned when conducting a two-group, randomized pilot study (n = 32) of a web-based intervention (Carepartner and Constraint-Induced Therapy [CARE-CITE]) designed to foster positive carepartner engagement in home-based activities to improve upper extremity function in persons with stroke. Challenges and issues included: 1) recruitment and referral, 2) data collection in the home setting, 3) participants' understanding of the rationale for adhering to constraint-induced movement therapy principles (wearing mitt on the less-affected limb), 4) tracking adherence of upper extremity practice time, 5) participant-driven goal setting, 6) potentially unsafe participant practice activities, 7) home visit safety, 8) encouraging versus controlling-using autonomy support, 9) participant needs beyond study scope, and 10) ethical safeguards for addressing depressive symptoms. Researchers can incorporate suggested strategies to support methodological rigor and facilitate interventions engaging carepartners in the rehabilitation process when planning for research in the home environment.


Asunto(s)
Rehabilitación de Accidente Cerebrovascular , Accidente Cerebrovascular , Humanos , Rehabilitación de Accidente Cerebrovascular/métodos , Cuidadores , Proyectos Piloto , Extremidad Superior
3.
Res Sq ; 2023 Apr 14.
Artículo en Inglés | MEDLINE | ID: mdl-37090566

RESUMEN

Background: Despite family carepartners of individuals post-stroke experiencing high levels of strain and reduced quality of life, stroke rehabilitation interventions rarely address carepartner well-being or offer training to support their engagement in therapeutic activities. Our group has developed creative intervention approaches to support families during stroke recovery, thereby improving physical and psychosocial outcomes for both carepartners and stroke survivors. The purpose of this preliminary clinical trial is to test the feasibility of an adapted, home-based intervention (Carepartner Collaborative Integrative Therapy for Gait-CARE-CITE-Gait) designed to facilitate positive carepartner involvement during home-based training targeting gait and mobility. Methods: This two-phased study will determine the feasibility of CARE-CITE-Gait, a novel intervention developed by our team that leverages principles from our previous carepartner-focused upper extremity intervention. During the 4-week CARE-CITE-Gait intervention, carepartners review online video-based modules designed to illustrate strategies for an autonomy-supportive environment during functional mobility task practice, and the study team completes two 2-hour (home-based) visits for dyad collaborative goal setting. In Phase I, the usability and acceptability of the CARE-CITE-Gait modules will be evaluated by stroke rehabilitation content experts and carepartners. In Phase II, feasibility (based on measures of recruitment, retention, and intervention adherence) will be measured. Preliminary effects of the CARE-CITE-Gait will be gathered using a single-group, evaluator blinded, quasi-experimental design with repeated measures (two baseline visits one week apart, post-test, and one-month follow-up) with 15 carepartner and stroke survivor dyads. Outcomes include psychosocial variables (strain, family conflict surrounding stroke recovery, autonomy support and life changes) collected from carepartners, and measures of functional mobility, gait speed, stepping activity, and health-related quality of life collected from stroke survivors. Discussion: The findings of the feasibility testing and preliminary data on the effects of CARE-CITE-Gait will provide justification and information to guide a future definitive randomized clinical trial. The knowledge gained from this study will enhance our understanding of and aid the development of rehabilitation approaches that address both carepartner and stroke survivor needs during the stroke recovery process. Trial Registration: ClinicalTrials.gov, NCT05257928. Registered 25 February 2022, https://clinicaltrials.gov/ct2/show/NCT05257928.

4.
Sci Adv ; 8(43): eabo6672, 2022 Oct 28.
Artículo en Inglés | MEDLINE | ID: mdl-36288308

RESUMEN

The deepest marine ecosystem, the hadal zone, hosts endemic biodiversity resulting from geographic isolation and environmental selection pressures. However, the pan-ocean distribution of some fauna challenges the concept that the hadal zone is a series of isolated island-like habitats. Whether this remains true at the population genomic level is untested. We investigated phylogeographic patterns of the amphipod, Bathycallisoma schellenbergi, from 12 hadal features across the Pacific, Atlantic, Indian, and Southern oceans and analyzed genome-wide single-nucleotide polymorphism markers and two mitochondrial regions. Despite a cosmopolitan distribution, populations were highly restricted to individual features with only limited gene flow between topographically connected features. This lack of connectivity suggests that populations are on separate evolutionary trajectories, with evidence of potential cryptic speciation at the Atacama Trench. Together, this global study demonstrates that the shallower ocean floor separating hadal features poses strong barriers to dispersal, driving genetic isolation and creating pockets of diversity to conserve.

5.
PLoS One ; 17(6): e0269181, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35704568

RESUMEN

Marine ecosystems are structured by coexisting species occurring in adjacent or nested assemblages. Mangroves and corals are typically observed in adjacent assemblages (i.e., mangrove forests and coral reefs) but are increasingly reported in nested mangrove-coral assemblages with corals living within mangrove habitats. Here we define these nested assemblages as "coexisting mangrove-coral" (CMC) habitats and review the scientific literature to date to formalize a baseline understanding of these ecosystems and create a foundation for future studies. We identify 130 species of corals living within mangrove habitats across 12 locations spanning the Caribbean Sea, Red Sea, Indian Ocean, and South Pacific. We then provide the first description, to our knowledge, of a canopy CMC habitat type located in Bocas del Toro, Panama. This canopy CMC habitat is one of the most coral rich CMC habitats reported in the world, with 34 species of corals growing on and/or among submerged red mangrove aerial roots. Based on our literature review and field data, we identify biotic and abiotic characteristics common to CMC systems to create a classification framework of CMC habitat categories: (1) Lagoon, (2) Inlet, (3) Edge, and (4) Canopy. We then use the compiled data to create a GIS model to suggest where additional CMC habitats may occur globally. In a time where many ecosystems are at risk of disappearing, discovery and description of alternative habitats for species of critical concern are of utmost importance for their conservation and management.


Asunto(s)
Antozoos , Animales , Arrecifes de Coral , Ecosistema , Peces , Humedales
6.
J Biomed Mater Res B Appl Biomater ; 110(7): 1615-1623, 2022 07.
Artículo en Inglés | MEDLINE | ID: mdl-35099112

RESUMEN

A combination product of human mesenchymal stem/stromal cells (MSCs) embedded in an extracellular matrix scaffold and preconditioned with hypoxia and the beta-adrenergic receptor antagonist, timolol, combined with sustained timolol application post implantation, has shown promising results for improving wound healing in a diabetic mouse model. In the present study, we extend those findings to the more translatable large animal porcine wound model and show that the combined treatment promotes wound reepithelialization in these excisional wounds by 40.2% and increases the CD31 immunostaining marker of angiogenesis compared with the matrix control, while maintaining an accumulated timolol plasma concentration below the clinically safe level of 0.3 ng/mL after the 15-day course of topical application. Human GAPDH was not elevated in the day 15 wounds treated with MSC-containing device relative to wounds treated with matrix alone, indicating that the xenografted human MSCs in the treatment do not persist in these immune-competent animals after 15 days. The work demonstrates the efficacy and safety of the combined treatment for improving healing in the clinically relevant porcine wound model.


Asunto(s)
Trasplante de Células Madre Mesenquimatosas , Células Madre Mesenquimatosas , Animales , Modelos Animales de Enfermedad , Matriz Extracelular , Humanos , Trasplante de Células Madre Mesenquimatosas/métodos , Ratones , Porcinos , Timolol/farmacología , Cicatrización de Heridas
7.
Perspect Psychol Sci ; 16(5): 1008-1023, 2021 09.
Artículo en Inglés | MEDLINE | ID: mdl-34498530

RESUMEN

In this article, we critique the dominant understanding of microaggressions introduced by Derald Wing Sue and his colleagues-what we call the act-based account of microaggressions-by identifying its theoretical and practical shortcomings. On the basis of this critique, we introduce and defend an alternative, ameliorative account of microaggressions, what we call the harm-based account of microaggressions. Instead of understanding microaggressions on the basis of the acts committed by the microaggressing agent, we call for a reorientation of the concept so that the recipients of microaggressions and the harms they experience become the focal point.


Asunto(s)
Agresión , Humanos , Microagresión
8.
Telemed Rep ; 2(1): 97-107, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-35720752

RESUMEN

Introduction: Telemedicine has enabled access to care during the COVID-19 pandemic. This article describes the creation and implementation of a telemedicine clinic in a student-run free clinic (SRFC) serving uninsured patients in Tampa, FL. Methods: A new workflow was developed for a telemedicine clinic, including a screening algorithm to determine appropriateness for telemedicine appointments. Volunteer students and providers conducted patient remote visits that allowed students to have service-learning experiences. Analysis of patient visits between March 31, 2020, and July 23, 2020, was conducted. Study protocol was reviewed by the Institutional Review Board and an exemption was obtained. Results: Eighty-four visits were conducted for 58 unique patients. Seventy-two percent were female and 88% were of Hispanic or Latino origin. Forty-four students and 33 physicians volunteered. The majority of visits were general follow-ups (83%) followed by psychiatry (11%) and cardiology (6%). Conclusion: Telemedicine is a viable method of providing care for an at-risk uninsured population at an SRFC. It can also enhance service learning for medical student volunteers.

9.
Acad Med ; 96(2): 255, 2021 02 01.
Artículo en Inglés | MEDLINE | ID: mdl-33149090
10.
Arch Dis Child ; 2020 Dec 21.
Artículo en Inglés | MEDLINE | ID: mdl-33355203

RESUMEN

BACKGROUND: Children are recognised as at lower risk of severe COVID-19 compared with adults, but the impact of immunosuppression is yet to be determined. This study aims to describe the clinical course of COVID-19 in children with kidney disease taking immunosuppressive medication and to assess disease severity. METHODS: Cross-sectional study hosted by the European Rare Kidney Disease Reference Network and supported by the European, Asian and International paediatric nephrology societies. Anonymised data were submitted online for any child (age <20 years) with COVID-19 taking immunosuppressive medication for a kidney condition. Study recruited for 16 weeks from 15 March 2020 to 05 July 2020. The primary outcome was severity of COVID-19. RESULTS: 113 children were reported in this study from 30 different countries. Median age: 13 years (49% male). Main underlying reasons for immunosuppressive therapy: kidney transplant (47%), nephrotic syndrome (27%), systemic lupus erythematosus (10%). Immunosuppressive medications used include: glucocorticoids (76%), mycophenolate mofetil (MMF) (54%), tacrolimus/ciclosporine A (58%), rituximab/ofatumumab (11%). 78% required no respiratory support during COVID-19 illness, 5% required bi-level positive airway pressure or ventilation. Four children died; all deaths reported were from low-income countries with associated comorbidities. There was no significant difference in severity of COVID-19 based on gender, dialysis status, underlying kidney condition, and type or number of immunosuppressive medications. CONCLUSIONS: This global study shows most children with a kidney disease taking immunosuppressive medication have mild disease with SARS-CoV-2 infection. We therefore suggest that children on immunosuppressive therapy should not be more strictly isolated than children who are not on immunosuppressive therapy.

11.
Acta Crystallogr C Struct Chem ; 76(Pt 10): 972-981, 2020 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-33016268

RESUMEN

The structures of five s-block metal salt forms of three disulfonated monoazo dyes are presented. These are poly[di-µ-aqua-diaqua[µ4-3,3'-(diazane-1,2-diyl)bis(benzenesulfonato)]disodium(I)], [Na2(C12H8N2O6S2)(H2O)4]n, (I), catena-poly[[tetraaquacalcium(II)]-µ-3,3'-(diazane-1,2-diyl)bis(benzenesulfonato)], [Ca(C12H8N2O6S2)(H2O)4]n, (II), catena-poly[[[diaquacalcium(II)]-µ-2-(4-amino-3-sulfonatophenyl)-1-(4-sulfonatophenyl)diazenium] dihydrate], {[Na(C12H10N3O6S2)(H2O)2]·2H2O}n, (III), hexaaquamagnesium bis[2-(4-amino-3-sulfonatophenyl)-1-(4-sulfonatophenyl)diazenium] octahydrate, [Mg(H2O)6](C12H10N3O6S2)2·8H2O, (IV), and poly[[{µ2-4-[2-(4-amino-2-methyl-5-methoxyphenyl)diazen-1-yl]benzene-1,3-disulfonato}di-µ-aqua-diaquabarium(II)] dihydrate], {[Ba(C14H13N3O7S2)(H2O)4]·2H2O}n, (V). Compound (III) is that obtained on crystallizing the commercial dyestuff Acid Yellow 9 [74543-21-8]. The Mg species is a solvent-separated ion-pair structure and the others are all coordination polymers with bonds from the metal atoms to sulfonate groups. Compound (I) is a three-dimensional coordination polymer, (V) is a two-dimensional coordination polymer and both (II) and (III) are one-dimensional coordination polymers. The coordination behaviour of the azo ligands and the water ligands, the dimensionality of the coordination polymers and the overall packing motifs of these five structures are contrasted to those of monosulfonate monoazo congers. It is found that (I) and (II) adopt similar structural types to those of monosulfonate species but that the other three structures do not.

12.
Stem Cells Transl Med ; 9(11): 1353-1364, 2020 11.
Artículo en Inglés | MEDLINE | ID: mdl-32720751

RESUMEN

Diabetic foot ulcers are a major health care concern with limited effective therapies. Mesenchymal stem cell (MSC)-based therapies are promising treatment options due to their beneficial effects of immunomodulation, angiogenesis, and other paracrine effects. We investigated whether a bioengineered scaffold device containing hypoxia-preconditioned, allogeneic human MSCs combined with the beta-adrenergic antagonist timolol could improve impaired wound healing in diabetic mice. Different iterations were tested to optimize the primary wound outcome, which was percent of wound epithelialization. MSC preconditioned in 1 µM timolol at 1% oxygen (hypoxia) seeded at a density of 2.5 × 105 cells/cm2 on Integra Matrix Wound Scaffold (MSC/T/H/S) applied to wounds and combined with daily topical timolol applications at 2.9 mM resulted in optimal wound epithelialization 65.6% (24.9% ± 13.0% with MSC/T/H/S vs 41.2% ± 20.1%, in control). Systemic absorption of timolol was below the HPLC limit of quantification, suggesting that with the 7-day treatment, accumulative steady-state timolol concentration is minimal. In the early inflammation stage of healing, the MSC/T/H/S treatment increased CCL2 expression, lowered the pro-inflammatory cytokines IL-1B and IL6 levels, decreased neutrophils by 44.8%, and shifted the macrophage ratio of M2/M1 to 1.9 in the wound, demonstrating an anti-inflammatory benefit. Importantly, expression of the endothelial marker CD31 was increased by 2.5-fold with this treatment. Overall, the combination device successfully improved wound healing and reduced the wound inflammatory response in the diabetic mouse model, suggesting that it could be translated to a therapy for patients with diabetic chronic wounds.


Asunto(s)
Diabetes Mellitus Experimental/complicaciones , Inmunofenotipificación/métodos , Trasplante de Células Madre Mesenquimatosas/métodos , Células Madre Mesenquimatosas/metabolismo , Timolol/uso terapéutico , Cicatrización de Heridas/efectos de los fármacos , Animales , Modelos Animales de Enfermedad , Humanos , Ratones , Timolol/farmacología
13.
Endeavour ; 44(1-2): 100719, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32513412

RESUMEN

The Puerto Rico Trench is a deep oceanic subduction zone that runs parallel with the northern coasts of Puerto Rico and the Dominican Republic. It is the deepest place in the Atlantic Ocean with a maximum depth of approximately 8400 m. Discovered by the HMS Challenger Expedition in 1875, the depth of the trench increased multiple times in the ensuing 100 years with the onset of sonar usage. It is perhaps unique among the world's deep trenches in that a series of unrelated but equally pioneering expeditions captured the true biological and geological characteristics of one of the deepest places in the world, observations that are still highly relevant today. Multiple deep water trawling campaigns and surveys using drop cameras and exploratory dives in a deep diving submersible provided great insight into the morphology of the trench, the types of habitat within the trench, the substrate, the food supply, and the diversity of species that inhabit these extraordinary depths. Many of these accounts are obscure and disparate, yet combined bear a remarkable similarity to recent work in other trenches. These unique and insightful accounts are collated and retold here alongside recent and comparable findings to contextualise these discoveries, prevent them from being forgotten, and keep the efforts of those involved to remain relevant as we continue to explore the deepest places of the world's oceans.

14.
Mar Genomics ; 54: 100782, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-32387528

RESUMEN

Whole genome sequences of four bacterial strains Dietzia maris SST1, Pseudomonas zhaodongensis SST2, Pseudomonas sp. SST3 and Halomonas sulfidaeris SST4, recovered from the South Shetland Trench sediment in Antarctica were analyzed using Ion Torrent sequencing technology. The respective sizes of their genomes (3.88, 4.99, 5.60 and 4.25 Mb) and GC contents (70.0, 60.3, 59.9 and 53.8%) are in agreement with these values of other strains of the species. The bacterial strains displayed promising antimicrobial activity against a number of pathogenic bacterial and fungal species. Whole genomes have been assembled and biosynthetic gene clusters (BGCs) have been identified using the antibiotics and Secondary Metabolite Analysis Shell (antiSMASH) web platform. Comparative analysis of the genome sequences revealed that the strains host abundant BGCs encoding for terpenes, siderophores, arylpolyene, bacteriocins, and lassopeptides. Furthermore, the key stress-related genes were identified and their distribution provided an insight into how these isolates adapt to key marine environmental conditions. This comprehensive study is a contribution to understanding the nature of life on the deep-sea environments.


Asunto(s)
Actinobacteria/genética , Genoma Bacteriano , Halomonas/genética , Pseudomonas/genética , Regiones Antárticas , Sedimentos Geológicos , Secuenciación de Nucleótidos de Alto Rendimiento , Océanos y Mares , Secuenciación Completa del Genoma
15.
R Soc Open Sci ; 6(3): 182053, 2019 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-31032050

RESUMEN

This comment presents acoustic and visual data showing deep seafloor depression chains similar to those reported in Marsh et al. (R. Soc. open sci. 5: 180286), though from a different deep-sea setting. Marsh et al. present data collected during cruise JC120 from polymetallic nodule rich sites within the Clarion-Clipperton Fracture Zone (CCFZ), at water depths of between 3999 and 4258 m. Within this comment, we present data collected with equivalent acoustic and imaging devices on-board the RV Sonne (SO261-March/April 2018) from the Atacama Trench, approximately 4000 m depth, which shows comparable depression chains in the seafloor. In contrast with the CCFZ observations, our study area was wholly free of polymetallic nodules, an observation therefore weakening the 'ballast collection' by deep-sea diving mammals formation hypothesis discussed in their paper. We support their alternate hypothesis that if these features are indeed generated by deep-diving megafauna, then they are more likely the resultant traces of infauna feeding or marks made during opportunistic capture of benthic fish/cephalopods. We observed these potential prey fauna with lander and towed camera systems during the cruise, with example images of these presented here. Both the SO261 and JC120 cruises employed high-resolution sidescan systems at deployment altitudes seldom used routinely until the last few years during scientific deep-sea surveys. Given that both cruises found these depression chains in contrasting physical regions of the East Pacific, they may have a more ubiquitous distribution than at just these sites. Thus, the impacts of cetacean foraging behaviour on deep seafloor communities, and the potential relevance of these prey sources to deep-diving species, should be considered.

16.
Water Sci Technol ; 79(1): 3-14, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30816857

RESUMEN

The wastewater industry is currently facing dramatic changes, shifting away from energy-intensive wastewater treatment towards low-energy, sustainable technologies capable of achieving energy positive operation and resource recovery. The latter will shift the focus of the wastewater industry to how one could manage and extract resources from the wastewater, as opposed to the conventional paradigm of treatment. Debatable questions arise: can the more complex models be calibrated, or will additional unknowns be introduced? After almost 30 years using well-known International Water Association (IWA) models, should the community move to other components, processes, or model structures like 'black box' models, computational fluid dynamics techniques, etc.? Can new data sources - e.g. on-line sensor data, chemical and molecular analyses, new analytical techniques, off-gas analysis - keep up with the increasing process complexity? Are different methods for data management, data reconciliation, and fault detection mature enough for coping with such a large amount of information? Are the available calibration techniques able to cope with such complex models? This paper describes the thoughts and opinions collected during the closing session of the 6th IWA/WEF Water Resource Recovery Modelling Seminar 2018. It presents a concerted and collective effort by individuals from many different sectors of the wastewater industry to offer past and present insights, as well as an outlook into the future of wastewater modelling.


Asunto(s)
Conservación de los Recursos Hídricos/métodos , Eliminación de Residuos Líquidos/métodos , Recursos Hídricos/provisión & distribución , Abastecimiento de Agua/estadística & datos numéricos , Conservación de los Recursos Hídricos/estadística & datos numéricos , Hidrodinámica , Modelos Estadísticos , Eliminación de Residuos Líquidos/estadística & datos numéricos , Aguas Residuales
17.
J Fish Biol ; 93(5): 917-930, 2018 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-30198116

RESUMEN

Pectoral fin healing in fin spines and rays were examined in juvenile Atlantic sturgeon Acipenser oxyrinchus oxyrinchus following three different sampling techniques (n = 8-9 fish per treatment): entire leading fin spine removed, a 1-2 cm portion removed near the point of articulation, or a 1-2 cm portion removed from a secondary fin ray. Also, to determine whether antibiotic treatment influences healing, an additional group of fish (n = 8) was not given an injection of an oxytetracycline (OTC)-based antibiotic following removal of the entire leading fin spine. Following fin sampling, fish from different treatments were mixed equally between three large (4,000 I) recirculating systems and fin-ray healing and mortality were monitored over a 12 month period. To assess healing, blood samples were collected at 4 months to measure immune system responses, radiographs were taken at 4, 8 and 12 months to assess the degree of calcification in regions of damaged fins and fins were analyzed histologically at 12 months. Fish grew from a mean weight of 1.8 to 3.2 kg during the experiment and survival was near 100% in all treatments, with only one fish dying of unknown causes. Leukocyte counts, an indication of health status and survival were similar among treatments and in groups with or without antibiotic injection. Radiographs revealed mineralization took longer in fish with the entire leading fin spine removed and was the slowest near the point of articulation, presumably due to the greater structural support for the pectoral fin at this location. Histological sampling indicated spines and rays had similar healing patterns. Following injury, an orderly matrix of collagen bundles and many evenly spaced scleroblasts were present, transitioning to Sharpey fibres, with concentric layers forming lamellar bone. Healing and mineralization were characterized as periosteal osteogenesis and included embedded osteocytes surrounded by an osteoid seam. Chondroid formation was apparent in a few fractures not associated with treatments. The duration of time for external wound healing and internal mineralization of spines and rays depended on the fin treatment, with the slowest healing observed in fish with the most tissue removed, the entire leading fin spine.


Asunto(s)
Aletas de Animales/fisiología , Peces/fisiología , Regeneración , Cicatrización de Heridas , Aletas de Animales/patología , Animales , Peces/inmunología , Osteogénesis , Oxitetraciclina/farmacología , Regeneración/efectos de los fármacos , Cicatrización de Heridas/efectos de los fármacos
18.
Neuroreport ; 29(7): 588-593, 2018 05 02.
Artículo en Inglés | MEDLINE | ID: mdl-29570159

RESUMEN

The aim of this study was to vascularize brain organoids with a patient's own endothelial cells (ECs). Induced pluripotent stem cells (iPSCs) of one UC Davis patient were grown into whole-brain organoids. Simultaneously, iPSCs from the same patient were differentiated into ECs. On day 34, the organoid was re-embedded in Matrigel with 250 000 ECs. Vascularized organoids were grown in vitro for 3-5 weeks or transplanted into immunodeficient mice on day 54, and animals were perfused on day 68. Coating of brain organoids on day 34 with ECs led to robust vascularization of the organoid after 3-5 weeks in vitro and 2 weeks in vivo. Human CD31-positive blood vessels were found inside and in-between rosettes within the center of the organoid after transplantation. Vascularization of brain organoids with a patient's own iPSC-derived ECs is technically feasible.


Asunto(s)
Vasos Sanguíneos/fisiología , Encéfalo/fisiología , Células Endoteliales/fisiología , Células Madre Pluripotentes Inducidas/fisiología , Organoides/irrigación sanguínea , Organoides/fisiología , Animales , Vasos Sanguíneos/citología , Encéfalo/citología , Células Endoteliales/citología , Humanos , Células Madre Pluripotentes Inducidas/citología , Masculino , Ratones , Neovascularización Fisiológica , Organoides/citología , Molécula-1 de Adhesión Celular Endotelial de Plaqueta/metabolismo , Técnicas de Cultivo de Tejidos
19.
Ecol Evol ; 8(1): 778-789, 2018 01.
Artículo en Inglés | MEDLINE | ID: mdl-29321913

RESUMEN

Variation in early life history traits often leads to differentially expressed morphological and behavioral phenotypes. We investigated whether variation in egg size and emergence timing influence subsequent morphology associated with migration timing in juvenile spring Chinook Salmon, Oncorhynchus tshawytscha. Based on evidence for a positive relationship between growth rate and migration timing, we predicted that fish from small eggs and fish that emerged earlier would have similar morphology to fall migrants, while fish from large eggs and individuals that emerged later would be more similar to older spring yearling migrants. We sorted eyed embryos within females into two size categories: small and large. We collected early and late-emerging juveniles from each egg size category. We used landmark-based geometric morphometrics and found that egg size appears to drive morphological differences. Egg size shows evidence for an absolute rather than relative effect on body morphology. Fish from small eggs were morphologically more similar to fall migrants, while fish from large eggs were morphologically more similar to older spring yearling migrants. Previous research has shown that the body morphology of fish that prefer the surface or bottom location in a tank soon after emergence also correlates with the morphological variations between wild fall and spring migrants, respectively. We found that late-emerging fish spent more time near the surface. Our study shows that subtle differences in early life history characteristics may correlate with a diversity of future phenotypes.

20.
Kennedy Inst Ethics J ; 28(4): 411-449, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30713193

RESUMEN

This paper proposes a victim-centered account of microaggressions within the context of clinical medicine. In so doing, it argues that microaggressions can undermine physician-patient relationships, preclude relationships of trust, and therefore compromise the kind and quality of care that patients deserve. Ultimately, by focusing on the experiences of victims of microaggressions, the paper demonstrates how harmful microaggressions in clinical medical contexts can be, and thus provides strong reasons why healthcare providers ought to know about them and actively work to avoid committing them.


Asunto(s)
Agresión , Medicina Clínica , Hostilidad , Relaciones Médico-Paciente , Prejuicio , Personal de Salud , Humanos , Personeidad
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA