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1.
Anal Chem ; 95(12): 5300-5306, 2023 03 28.
Artículo en Inglés | MEDLINE | ID: mdl-36917470

RESUMEN

Trichomoniasis is the most common nonviral sexually transmitted infection, affecting an estimated 275 million people worldwide. The causative agent is the parasitic protozoan Trichomonas vaginalis. Although the disease itself is typically mild, individuals with trichomonal infections have a higher susceptibility to more serious conditions. The emergence of parasite strains resistant to current therapies necessitates the need for novel treatment strategies. Since T. vaginalis is an obligate parasite that requires nucleoside salvage pathways, essential nucleoside ribohydrolase enzymes are promising new drug targets. Fragment screening and X-ray crystallography have enabled structure-guided design of inhibitors for two of these enyzmes. Linkage of enzymatic and antiprotozoal activity would be a transformative step toward designing novel, mechanism-based therapeutic agents. While a correlation with inhibition of purified enzyme would be mechanistically suggestive, a correlation with inhibition of in-cell enzyme activity would definitively establish this linkage. To demonstrate this linkage, we have translated our NMR-based activity assays that measure the activity of purified enzymes for use in T. vaginalis cells. The 19F NMR-based activity assay for the pyrimidine-specific enzyme translated directly to in-cell assays. However, the 1H NMR-based activity assay for the purine-specific enzyme required a switch from adenosine to guanosine substrate and the use of 13C-editing to resolve the substrate 1H signals from cell and growth media background signals. The in-cell NMR assays are robust and have been demonstrated to provide inhibition data on test compounds. The results described here represent the first direct measurement of enzyme activity in protozoan parasite cells.


Asunto(s)
Trichomonas vaginalis , Humanos , Nucleósidos/metabolismo , Guanosina/metabolismo , Espectroscopía de Resonancia Magnética
2.
Sensors (Basel) ; 22(3)2022 Jan 19.
Artículo en Inglés | MEDLINE | ID: mdl-35161489

RESUMEN

This paper describes the development of a mechatronic punch and bind office machine. Integrating smart technologies in the existing traditional business machines will ease the evolution of these systems, enabling productivity and efficiency. The development of an experimental platform that enables further advances in servitization is required. To increase the binding rate of the office document, as well as to reduce the likelihood of errors, efforts have been made to develop a measuring system that allows the document to be properly measured and specifies the appropriate binding spine at the same time. As a complement, developments have been conducted in a system that enables the verification of the inserted spine. In addition, a system for automated document binding along with an integrated platform that allows the communication between all systems is presented. In both its hardware design and its underlying sensors, the new system has several advantages, providing significant performance improvements and upgradability over existing systems. This alternative comprises a system that enables a variety of sheets of paper, plastic or other materials to be punched.


Asunto(s)
Aparatos Ortopédicos , Diseño de Equipo
3.
J Vasc Bras ; 20: e20200093, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-35515084

RESUMEN

Background: Microbubble contrast enhanced ultrasound (CEUS) is an accurate diagnostic method for follow-up after endovascular abdominal aortic aneurysm repair (EVAR) that has been well-established in international studies. However, there are no Brazilian studies that focus on this follow-up method. Objectives: The objective of this study was to report initial experience with CEUS at a tertiary hospital, comparing the findings of CEUS with those of conventional Doppler ultrasound (DUS), with the aim of determining whether addition of contrast to the standard ultrasonographic control protocol resulted in different findings. Methods: From 2015 to 2017, 21 patients in follow-up after EVAR underwent DUS followed by CEUS. The findings of these examinations were analyzed in terms of identification of complications and their capacity to identify the origin of endoleaks. Results: There was evidence of complications in 10 of the 21 cases examined: seven patients exhibited endoleaks (33.3%); two patients exhibited stenosis of a branch of the endograft (9.52%); and one patient exhibited a dissection involving the external iliac artery (4.76%). In the 21 patients assessed, combined use of both methods identified 10 cases of post-EVAR complications. In six of the seven cases of endoleaks (85.71%), use of the methods in combination was capable of identifying the origin of endoleakage. DUS alone failed to identify endoleaks in two cases (28.5%) and identified doubtful findings in another two cases (28.5%), in which diagnostic definition was achieved after employing CEUS. Conclusions: CEUS is a technique that is easy to perform and provides additional support for follow-up of infrarenal EVAR.

4.
Mol Ecol ; 27(3): 752-772, 2018 02.
Artículo en Inglés | MEDLINE | ID: mdl-29218784

RESUMEN

Intraspecific genetic diversity and divergence have a large influence on the adaption and evolutionary potential of species. The widely distributed starfish, Coscinasterias tenuispina, combines sexual reproduction with asexual reproduction via fission. Here we analyse the phylogeography of this starfish to reveal historical and contemporary processes driving its intraspecific genetic divergence. We further consider whether asexual reproduction is the most important method of propagation throughout the distribution range of this species. Our study included 326 individuals from 16 populations, covering most of the species' distribution range. A total of 12 nuclear microsatellite loci and sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene were analysed. COI and microsatellites were clustered in two isolated lineages: one found along the southwestern Atlantic and the other along the northeastern Atlantic and Mediterranean Sea. This suggests the existence of two different evolutionary units. Marine barriers along the European coast would be responsible for population clustering: the Almeria-Oran Front that limits the entrance of migrants from the Atlantic to the Mediterranean, and the Siculo-Tunisian strait that divides the two Mediterranean basins. The presence of identical genotypes was detected in all populations, although two monoclonal populations were found in two sites where annual mean temperatures and minimum values were the lowest. Our results based on microsatellite loci showed that intrapopulation genetic diversity was significantly affected by clonality whereas it had lower effect for the global phylogeography of the species, although still some impact on populations' genetic divergence could be observed between some populations.


Asunto(s)
Variación Genética , Estrellas de Mar/genética , Alelos , Animales , Océano Atlántico , Teorema de Bayes , Análisis por Conglomerados , Complejo IV de Transporte de Electrones/genética , Geografía , Mar Mediterráneo , Repeticiones de Microsatélite/genética , Filogeografía , Especificidad de la Especie
5.
Vasc Med ; 21(3): 209-16, 2016 06.
Artículo en Inglés | MEDLINE | ID: mdl-26896335

RESUMEN

The objective was to demonstrate the ability of ultrasound (US) with 3D properties to evaluate volumetry and biomechanical parameters of the aorta in patients with and without abdominal aortic aneurysm (AAA). Thirty-one patients with normal aortas (group 1), 46 patients with AAA measuring 3.0-5.5 cm (group 2) and 31 patients with AAA ⩾ 5.5 cm (group 3) underwent a 2D/3D-US examination of the infra-renal aorta, and the images were post-processed prior to being analyzed. In the maximum diameter, the global circumferential strain and the global maximum rotation assessed by 2D speckle-tracking algorithms were compared among the three groups. The volumetry data obtained using 3D-US from 40 AAA patients were compared with the volumetry data obtained by a contemporary computed tomography (CT) scan. The median global circumferential strain was 2.0% (interquartile range (IR): 1.0-3.0), 1.0% (IR: 1.0-2.0) and 1.0% (IR: 1.0-1.75) in groups 1, 2 and 3, respectively (p < 0.001). The median global maximum rotation decreased progressively from group 1 to group 3 (1.38º (IR: 0.77-2.13), 0.80º (IR: 0.57-1.0) and 0.50º (IR: 0.31-0.75), p < 0.001). AAA volume estimations by 3D-US correlated well with CT (R(2) = 0.76). In conclusion, US with 3D properties is non-invasive and has the potential to evaluate volumetry and biomechanical characteristics of AAA.


Asunto(s)
Aorta Abdominal/diagnóstico por imagen , Aneurisma de la Aorta Abdominal/diagnóstico por imagen , Interpretación de Imagen Asistida por Computador , Imagenología Tridimensional , Ultrasonografía/métodos , Anciano , Aorta Abdominal/fisiopatología , Aneurisma de la Aorta Abdominal/fisiopatología , Aortografía/métodos , Fenómenos Biomecánicos , Estudios de Casos y Controles , Angiografía por Tomografía Computarizada , Femenino , Humanos , Masculino , Persona de Mediana Edad , Valor Predictivo de las Pruebas , Estudios Prospectivos , Reproducibilidad de los Resultados , Estrés Mecánico
6.
Curr Opin Struct Biol ; 84: 102744, 2024 02.
Artículo en Inglés | MEDLINE | ID: mdl-38134536

RESUMEN

The architectures of tandem-repeat proteins are distinct from those of globular proteins. Individual modules, each comprising small structural motifs of 20-40 residues, are arrayed in a quasi one-dimensional fashion to form striking, elongated, horseshoe-like, and superhelical architectures, stabilized solely by short-range interaction. The spring-like shapes of repeat arrays point to elastic modes of action, and these proteins function as adapter molecules or 'hubs,' propagating signals within multi-subunit assemblies in diverse biological contexts. This flexibility is apparent in the dramatic variability observed in the structures of tandem-repeat proteins in different complexes. Here, using computational analysis, we demonstrate the striking ability of just one or a few global motions to recapitulate these structures. These findings show how the mechanics of repeat arrays are robustly enabled by their unique architecture. Thus, the repeating architecture has been optimized by evolution to favor functional modes of motions. The global motions enabling functional transitions can be fully visualized at http://bahargroup.org/tr_web.


Asunto(s)
Proteínas , Programas Informáticos , Conformación Proteica , Proteínas/química , Movimiento (Física)
7.
Mar Environ Res ; 192: 106186, 2023 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-37778060

RESUMEN

Echinoderms play important roles in marine ecosystems and exhibit high sensitivity to environmental changes. The echinoid Cassidulus mitis has been considered an endangered species due to its restricted geographic distribution and unique reproductive behavior, with an epibenthic lecithotrophic larva and offspring brooded among the female spines during initial development until the settler stage. We studied the effects of low salinities (30 and 26) and high temperatures (27 and 31 °C) on the early development of C. mitis in a predicted scenario of global climate change through four parameters: 1. survival and 2. chronology of larval development, and 3. survival and 4. growth of settlers. Both larvae and settlers of C. mitis can survive under these scenarios, probably due to the lecithotrophic and epibenthic larval characteristics and developmental strategies of this species. However, all experimental conditions affected at least one of the initial developmental studied parameters of C. mitis, potentially compromising the species' viability in a scenario of climate change.


Asunto(s)
Cambio Climático , Ecosistema , Animales , Femenino , Larva , Erizos de Mar , Equinodermos
8.
Rev Port Cir Cardiotorac Vasc ; 19(4): 217-20, 2012.
Artículo en Portugués | MEDLINE | ID: mdl-24490199

RESUMEN

Aortic vascular anomalies are complex anatomic entities requiring often complex and problematic surgical approaches. The authors report the clinical case of a Kommerell's diverticulum and right-sided aortic arch. Right-sided aortic arch is an uncommon congenital defect of the aorta and it is rare in the setting of an otherwise normal heart. A right-sided aortic arch was described more than two centuries ago. Several classifications of these anomalies have been proposed on the basis of the arrangement of the arch vessels, relationships with the esophagus, or the presence of congenital heart anomalies. In the adult population, a right-sided aortic arch is often asymptomatic, unless aneurismal disease develops. This usually occurs at the level of the take-off of an aberrant left subclavian artery and is known as a Kommerell's diverticulum. In spite of its rarity, this condition is clinically relevant due to the mortality associated with rupture, morbidity caused by compression of mediastinal structures, and complexity of surgery.


Asunto(s)
Aneurisma/patología , Aorta Torácica/anomalías , Enfermedades de la Aorta/patología , Anomalías Cardiovasculares/patología , Trastornos de Deglución/patología , Divertículo/patología , Arteria Subclavia/anomalías , Enfermedades de la Aorta/congénito , Enfermedades de la Aorta/diagnóstico , Divertículo/diagnóstico , Humanos , Masculino , Persona de Mediana Edad , Arteria Subclavia/patología
9.
PeerJ ; 9: e11503, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34178443

RESUMEN

To date, evidence regarding the performance of secondary metabolites from larval stages of sea stars as an anti-predation defense relates only to a few species/specimens from a few geographic ranges. Unfortunately, this hinders a comprehensive global understanding of this inter-specific predator-prey interaction. Here, we present laboratory experimental evidence of chemical defense action in the early developmental stages and adults of the sea star Echinaster (Othilia) brasiliensis from Brazil against sympatric and allopatric invertebrate consumers. Blastulae, early and late brachiolarias of E. (O.) brasiliensis were not consumed by the sympatric and allopatric crabs Mithraculus forceps. Blastulae were also avoided by the sympatric and allopatric individuals of the anemone Anemonia sargassensis, but not the larval stages. Extracts from embryos (blastula) and brachiolarias of E. (O.) brasiliensis from one sampled population (João Fernandes beach) significantly inhibited the consumption by sympatric M. forceps, but not by allopatric crabs and A. sargassensi anemone. In this same site, extracts from adults E. (O.) brasiliensis significantly inhibited the consumption by sympatric and allopatric specimens of the crab in a range of concentrations. Whereas equivalent extract concentrations of E. (O.) brasiliensis from other population (Itaipu beach)inhibited the predation by allopatric M. forceps, while sympatric individuals of this crab avoided the only the higher level tested. Then, early stages and adult specimens of E. (O.) brasiliensis can be chemically defended against consumers, but this action is quite variable, depending on the type (anemone or crab) and the origin of the consumer (sympatric or allopatric).

10.
J Vasc Interv Radiol ; 21(4): 465-9, 2010 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-20172744

RESUMEN

PURPOSE: To report a series of patients with symptomatic internal carotid artery (ICA) occlusion treated with angioplasty and stents. MATERIALS AND METHODS: From a consecutive series of 50 patients experiencing neurologic ischemic symptoms and shown by conventional ultrasonography (US) to have a total ICA occlusion, 16 patients (ages 45-79 years; mean, 63 y; 10 men) were selected between August 2006 to September 2008 to be treated with angioplasty based on discovery of an open ICA distal to the occlusion through contrast-enhanced echo Doppler imaging and/or multislice contrast computed tomography (CT). Angioplasty and stent placement were performed under cerebral protection. Follow-up duplex imaging was performed at 14 days and 3 months and every 6 months thereafter and CT follow-up was performed at 2-9 months; the mean follow-up period was 9.9 months. RESULTS: Lesion crossing and stent placement was successful in 13 of 16 patients. There were no deaths, conversions, cardiac complications, or major strokes. One patient had a transient mild hemiparesis in the upper limb, with total recovery in 3 months. At follow-up, all 13 patients with a good initial result remained with patent arterial lumens and resolution of neurologic ischemic symptoms. After 2-9 months, ICAs with a "string sign" had calibers close or equal to those of normal arteries. CONCLUSIONS: Angioplasty with stent placement is an effective treatment with a low morbidity rate for selected patients who continue to experience neurologic ischemic symptoms despite US findings of total occlusion of the ICA.


Asunto(s)
Angioplastia de Balón , Prótesis Vascular , Estenosis Carotídea/diagnóstico , Estenosis Carotídea/cirugía , Stents , Anciano , Terapia Combinada , Femenino , Humanos , Masculino , Persona de Mediana Edad , Tomografía Computarizada por Rayos X , Resultado del Tratamiento , Ultrasonografía
12.
J Exp Zool A Ecol Integr Physiol ; 327(9): 542-550, 2017 11.
Artículo en Inglés | MEDLINE | ID: mdl-29368803

RESUMEN

Echinoderms are restricted to the marine environment and are osmoconformer invertebrates. However, some species live in unstable environments. Especially those species, and those of larger body size, tend to show variable, albeit transient, ionic gradients between their coelomic fluid and external seawater. In order to further examine how sea urchin size relates to apparent ionic permeability of their body wall/epithelia, specimens of Echinometra lucunter, Lytechinus variegatus, Paracentrotus gaimardi, and Arbacia lixula-A. lixula of two distinct populations, Rio de Janeiro and Santa Catarina-were abruptly transferred from 35 psu to either 25 or 45 psu. Sodium, chloride, magnesium, and potassium concentrations were assayed in their coelomic fluids after 0, 1, 2, and 3 hr of exposure. Relative area of putative permeable (i.e., cross section areas of soft tissues, or test holes) surfaces (PPS) was estimated in empty tests as the sum of the peristomial area (oral hole in the empty test) and the total cross-section area of ambulacral holes, divided by the total volume (TV) of the test. L. variegatus and E. lucunter, the largest species, had PPS/TV values similar to that of the much smaller P. gaimardi. A. lixula was the "most putatively-permeable and conformer" among them all, especially urchins from the Santa Catarina population. Internal ionic levels equilibrated faster with external water in 45 than in 25, and differences among ions were observed. Body size is relevant, among many other factors, to aid conformers such as sea urchins to dwell in intertidal unstable habitats.


Asunto(s)
Presión Osmótica , Salinidad , Erizos de Mar/anatomía & histología , Erizos de Mar/fisiología , Animales , Líquidos Corporales , Tamaño Corporal/fisiología , Erizos de Mar/efectos de los fármacos , Agua/química , Equilibrio Hidroelectrolítico
13.
CienciaUAT ; 17(1): 89-106, jul.-dic. 2022. tab, graf
Artículo en Español | LILACS-Express | LILACS | ID: biblio-1404109

RESUMEN

Resumen La producción de la información, en relación con su calidad dentro de la práctica periodística en general, está supeditada a diversos criterios, como la veracidad de la fuente, la acreditación de los autores, la comprensión del texto y la relevancia de la información, entre otros indicadores. El objetivo del presente trabajo fue desarrollar una escala para evaluar la calidad de la información transmitida por medios de comunicación en Internet. Para ello, se realizaron tres etapas generales: la primera estuvo conformada por 13 estudios, donde, después de un análisis de contenido, se extrajeron las dimensiones o aspectos de la calidad de la información más frecuentemente mencionados. Posteriormente, se procedió a la detección de 35 indicadores, clasificados en 5 dimensiones; en la segunda se obtuvieron 65 ítems, a partir de la clasificación de 5 dimensiones y los 35 indicadores; en la tercera se pilotó el instrumento obtenido, el cual adquirió un formato de lista de verificación integrado por 38 ítems, y con el propósito de determinar la validez de discriminación y la confiabilidad de la escala, se aplicó a una muestra no aleatoria de 100 noticias sobre COVID-19, publicadas en sitios de internet durante el 21 de enero de 2020 y el 31 de julio de 2021. La escala desarrollada permitió evaluar la calidad de la información que se transmite por medios de comunicación electrónicos, por lo que puede ser utilizada para mejorar las prácticas de los encargados de construir el contenido informativo y divulgarlo.


Abstract Information production, regarding its quality within journalistic practice in general, is subject to various criteria, such as the veracity of the source, the accreditation of the authors, the understanding of the text, and the relevance of the information, among other indicators. The objective of the present work was to develop a scale to assess the quality of information broadcasted by media on the Internet. To achieve this goal, three general stages were carried out: the first consisted of 13 studies, where, after a content analysis, the most frequently mentioned quality information dimensions were extracted. Subsequently, 35 indicators classified in 5 dimensions were detected. In the second stage, 65 items were obtained from the classification of 5 dimensions and 35 indicators. In the third stage, the obtained instrument was piloted. The instrument acquired a checklist format made up of 38 items. To determine the discrimination validity and the reliability of the scale, it was applied to a non-random sample of 100 COVID-19 news posted on internet sites from January 21st, 2020, to July 31, 2021. The developed scale allowed the evaluation of the quality of information broadcasted by electronic media, it can therefore be used to improve the practices of those in charge of constructing the informative content and disseminating it.

14.
Biol Bull ; 230(1): 25-34, 2016 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-26896175

RESUMEN

We describe the development and juvenile morphology of the sea star Echinaster (Othilia) brasiliensis in order to explore evolutionary developmental modes and skeletal homologies. This species produces large, buoyant eggs (0.6 ± 0.03 mm diameter), and has a typical lecithotrophic brachiolaria larva. The planktonic brachiolaria larva is formed 2-4 days after fertilization, when cilia cover the surface. Early juveniles are completely formed by 18 days of age. Initial growth is supported by maternal nutrients while the stomach continues to develop until 60 days after fertilization, when juveniles reach about 0.5 mm of radius length. The madreporite was observed 88 days after fertilization. In the youngest juvenile skeleton of E. (O.) brasiliensis, the madreporite and odontophore are homologous to those of other recent, non-paxillosid asteroids, and follow the Late Madreporic Mode. The emergence of plates related to the ambulacral system follows the Ocular Plate Rule. The development and juvenile skeletal morphology of this species are similar to those of the few other studied species in the genus Echinaster. This study corroborates the notion that the mode of development--including a short-lived lecithotrophic brachiolaria larva--in all Echinaster species shares a similar pattern that may be conserved throughout the evolutionary history of the group.


Asunto(s)
Esqueleto/crecimiento & desarrollo , Estrellas de Mar/crecimiento & desarrollo , Animales , Larva/anatomía & histología , Larva/crecimiento & desarrollo , Microscopía , Esqueleto/anatomía & histología , Estrellas de Mar/anatomía & histología
15.
J. vasc. bras ; 20: e20200093, 2021. tab, graf
Artículo en Portugués | LILACS | ID: biblio-1346433

RESUMEN

Resumo Contexto O ultrassom contrastado por microbolhas (CMUS) é uma modalidade diagnóstica de acurácia bem demonstrada por estudos internacionais para seguimento de reparo endovascular do aneurisma de aorta abdominal (EVAR). Não existem, no entanto, estudos nacionais focados nesse método de seguimento. Objetivos O objetivo deste estudo foi relatar a experiência inicial com CMUS em um hospital terciário, traçando uma comparação dos achados do CMUS com o ultrassom Doppler convencional (USGD), com o intuito de verificar se a adição de contraste ao protocolo padrão de controle ultrassonográfico incorreu alteração nos achados. Métodos Entre 2015 e 2017, 21 pacientes em seguimento de EVAR foram submetidos ao USGD seguido de CMUS. Foram avaliados os achados de exame referentes à identificação de complicações, bem como à capacidade de identificação da origem da endofuga. Resultados Entre os 21 casos avaliados, 10 complicações foram evidenciadas no total: sete pacientes apresentaram endofuga (33,3%); dois pacientes apresentaram estenose em ramo de endoprótese (9,52%); e um paciente apresentou dissecção em artéria ilíaca externa (4,76%). Em 21 pacientes avaliados, o uso combinado dos métodos identificou 10 casos de complicações pós-EVAR. Em seis dos sete casos de endofugas (85,71%), o uso dos métodos combinados foi capaz de identificar a origem. O USGD isolado falhou na identificação da endofuga em dois casos (28,5%), identificando achados duvidosos em outros dois casos (28,5%), que obtiveram definição diagnóstica após associação do CMUS. Conclusões O CMUS é uma técnica de fácil execução, a qual adiciona subsídios ao seguimento de EVAR infrarrenal.


Abstract Background Microbubble contrast enhanced ultrasound (CEUS) is an accurate diagnostic method for follow-up after endovascular abdominal aortic aneurysm repair (EVAR) that has been well-established in international studies. However, there are no Brazilian studies that focus on this follow-up method. Objectives The objective of this study was to report initial experience with CEUS at a tertiary hospital, comparing the findings of CEUS with those of conventional Doppler ultrasound (DUS), with the aim of determining whether addition of contrast to the standard ultrasonographic control protocol resulted in different findings. Methods From 2015 to 2017, 21 patients in follow-up after EVAR underwent DUS followed by CEUS. The findings of these examinations were analyzed in terms of identification of complications and their capacity to identify the origin of endoleaks. Results There was evidence of complications in 10 of the 21 cases examined: seven patients exhibited endoleaks (33.3%); two patients exhibited stenosis of a branch of the endograft (9.52%); and one patient exhibited a dissection involving the external iliac artery (4.76%). In the 21 patients assessed, combined use of both methods identified 10 cases of post-EVAR complications. In six of the seven cases of endoleaks (85.71%), use of the methods in combination was capable of identifying the origin of endoleakage. DUS alone failed to identify endoleaks in two cases (28.5%) and identified doubtful findings in another two cases (28.5%), in which diagnostic definition was achieved after employing CEUS. Conclusions CEUS is a technique that is easy to perform and provides additional support for follow-up of infrarenal EVAR.


Asunto(s)
Humanos , Masculino , Anciano , Anciano de 80 o más Años , Aneurisma de la Aorta Abdominal/cirugía , Ultrasonografía Doppler/instrumentación , Medios de Contraste , Microburbujas , Procedimientos Endovasculares , Estudios de Seguimiento , Aneurisma de la Aorta Abdominal/rehabilitación , Aneurisma de la Aorta Abdominal/diagnóstico por imagen , Ultrasonografía Doppler/métodos
16.
Rev. biol. trop ; 69(supl. 2)mar. 2021.
Artículo en Inglés | LILACS, SaludCR | ID: biblio-1507744

RESUMEN

Introduction: The locomotion behavior of an organism involves the integration of aspects like body symmetry, sensory and locomotor systems. Furthermore, various ecological factors seem to be related to locomotion characteristics, such as foraging strategy, migration trends, response to predators and competitors, and environmental stress. Objective: To analyze locomotion and the influence of body symmetry in the crawling and righting movements of the sea star Asterina stellifera. Methods: We carried out laboratory experiments in aquariums in the presence/absence of water current and on a horizontal and vertical surface. Results: The speed is similar to speed in other species of similar size. Both the speed and linearity of displacement were independent of individual body size. A water current leads to faster crawling and straight paths, but there is no rheotaxis: streams do not affect locomotion. Speed and linearity of displacement were independent of individual body size. The displacement pattern described here may be an adaptation of organisms that present dense populations in communities with high prey abundance, as is the case of A. stellifera. Conclusions: Like other asteroids, this species did not show an Anterior/Posterior plane of symmetry during locomotion, or righting movement: it does not tend to bilaterality.


Introducción: El comportamiento de locomoción de un organismo implica la integración de aspectos como la simetría corporal, los sistemas sensorial y locomotor. Además, varios factores ecológicos parecen estar relacionados con las características de la locomoción, como la estrategia de alimentación, las tendencias migratorias, la respuesta a los depredadores y competidores y el estrés ambiental. Objetivo: Analizar el patrón general de locomoción y la influencia de la simetría corporal en la locomoción y enderezamiento de la estrella de mar Asterina stellifera. Métodos: Realizamos experimentos de laboratorio en acuarios en presencia / ausencia de corriente de agua y en superficie horizontal y vertical. Resultados: La velocidad es similar a la velocidad en otras especies de tamaño similar. Tanto la velocidad como la linealidad del desplazamiento fueron independientes del tamaño corporal individual. Una corriente de agua conduce a una velocidad de desplazamiento mayor y a trayectorias más rectas, pero no hay reotaxis: una corriente de agua no afecta el patrón de locomoción. La velocidad y la linealidad del desplazamiento fueron independientes del tamaño corporal individual. El patrón de desplazamiento aquí descrito puede ser una adaptación de organismos que presentan densas poblaciones en comunidades con alta abundancia de presas, como es el caso de A. stellifera. Conclusiones: Al igual que otros asteroides, esta especie no mostró un plano de simetría Anterior / Posterior durante la locomoción o el movimiento de enderezamiento: no tiende a la bilateralidad.


Asunto(s)
Animales , Estrellas de Mar/crecimiento & desarrollo , Locomoción , Asterias/crecimiento & desarrollo
17.
Rev. biol. trop ; 69(supl. 2)mar. 2021.
Artículo en Inglés | LILACS, SaludCR | ID: biblio-1507759

RESUMEN

Introduction: Cassiduloids play a prominent role in echinoid evolutionary history because they probably are the ancestral group of clypeasteroids. Some extant species are brooding and rare in the environment. Consequently, there are no studies on their maintenance in the laboratory. Objective: Establish an efficient aquarium system for C. mitis, endemic to Brazil, for ontogenetic studies. Methods: Four aquarium systems were built, with 3 replicates each one: (1) with seawater flow [F]; (2) with seawater flow and air injection into sediment [FA]; (3) without seawater flow but with air injection into the sediment [A]; and (4) without both seawater flow and air injection into the sediment [C]. Each experimental aquarium (three per treatment) had two adults. Each of the two sets of experiments lasted about 60 days. Results: We observed low mortality in the first 30 days in all systems and, after 30 days, it was higher in those with air-pumped into the sediment (system A in the first set of experiments, and system FA in the second one). Conclusions: For experiments lasting 30 days, our four systems are suitable. For longer periods, we recommend aquaria with seawater flow and without air-pumps into the sediment.


Introducción: Los casiduloides desempeñan un papel destacado en la historia evolutiva de los equinoides porque probablemente son el grupo ancestral de clipeasteroides. Algunas especies existentes son inquietantes y raras en el medio ambiente. En consecuencia, no existen estudios sobre su mantenimiento en laboratorio. Objetivo: Establecer un sistema de acuario eficiente para C. mitis, endémica de Brasil, para estudios ontogenéticos. Métodos: Se construyeron cuatro sistemas de acuarios, con 3 réplicas cada uno: (1) con flujo de agua de mar [F]; (2) con flujo de agua de mar e inyección de aire en el sedimento [FA]; (3) sin flujo de agua de mar pero con inyección de aire en el sedimento [A]; y (4) sin flujo de agua de mar ni inyección de aire en el sedimento [C]. Cada acuario experimental (tres por tratamiento) tenía dos adultos. Cada uno de los dos conjuntos de experimentos duró aproximadamente 60 días. Resultados: Observamos una baja mortalidad en los primeros 30 días en todos los sistemas y, después de 30 días, fue mayor en aquellos con aire bombeado al sedimento (sistema A en el primer conjunto de experimentos y sistema FA en el segundo). Conclusiones: Para experimentos de 30 días, nuestros cuatro sistemas son adecuados. Para períodos más largos, recomendamos acuarios con flujo de agua de mar y sin bombas de aire en el sedimento.


Asunto(s)
Animales , Erizos de Mar/crecimiento & desarrollo , Ambiente Acuático , Brasil , Fauna Marina
18.
Clinics (Sao Paulo) ; 70(1): 1-6, 2015 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-25672421

RESUMEN

OBJECTIVE: The purpose of this study was to evaluate the effectiveness of contrast-enhanced ultrasound with a second-generation contrast agent in distinguishing between occlusion and pseudo-occlusion of the cervical internal carotid artery, comparing it with that of conventional Doppler ultrasound and the gold standard, computed tomography angiography. METHOD: Between June 2006 and June 2012, we screened 72 symptomatic vascular surgery outpatients at a public hospital. Among those patients, 78 cervical internal carotid arteries were previously classified as occluded by Doppler ultrasound (without contrast). The patients were examined again with Doppler ultrasound, as well as with contrast-enhanced ultrasound and computed tomography angiography. The diagnosis was based on the presence or absence of flow. RESULTS: Among the 78 cervical internal carotid arteries identified as occluded by Doppler ultrasound, occlusion was confirmed by computed tomography angiography in only 57 (73.1%), compared with 59 (77.5%) for which occlusion was confirmed by contrast-enhanced ultrasound (p>0.5 vs. computed tomography angiography). Comparing contrast-enhanced ultrasound with Doppler ultrasound, we found that the proportion of cervical internal carotid arteries classified as occluded was 24.4% higher when the latter was used (p<0.001). CONCLUSIONS: We conclude that, in making the differential diagnosis between occlusion and pseudo-occlusion of the cervical internal carotid artery, contrast-enhanced ultrasound with a second-generation contrast agent is significantly more effective than conventional Doppler ultrasound and is equally as effective as the gold standard (computed tomography angiography). Our findings suggest that contrast-enhanced ultrasound could replace computed tomography angiography in this regard.


Asunto(s)
Arteria Carótida Interna/diagnóstico por imagen , Estenosis Carotídea/diagnóstico por imagen , Medios de Contraste , Ultrasonografía Doppler en Color/métodos , Adulto , Anciano , Anciano de 80 o más Años , Angiografía/métodos , Diagnóstico Diferencial , Femenino , Humanos , Masculino , Persona de Mediana Edad , Valor Predictivo de las Pruebas , Reproducibilidad de los Resultados , Tomografía Computarizada por Rayos X/métodos
20.
J Appl Genet ; 53(4): 449-56, 2012 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-22941514

RESUMEN

The objective of this study was to identify loci associated with tail biting or being a victim of tail biting in Norwegian crossbred pigs using a genome-wide association study with PLINK case-control analysis. DNA was extracted from hair or blood samples collected from 98 trios of crossbred pigs located across Norway. Each trio came from the same pen and consisted of one pig observed to initiate tail biting, one pig which was the victim of tail biting and a control pig which was not involved in either behaviour. DNA was genotyped using the Illumina PorcineSNP60 BeadChip whole-genome single-nucleotide polymorphism (SNP) assay. After quality assurance filtering, 53,952 SNPs remained comprising 74 animals (37 pairs) for the tail biter versus control comparison and 53,419 SNPs remained comprising 80 animals (40 pairs) for the victim of tail biting versus control comparison. An association with being a tail biter was observed on Sus scrofa chromosome 16 (SSC16; p = 1.6 × 10(-5)) and an unassigned chromosome (p = 3.9 × 10(-5)). An association with being the victim of tail biting was observed on Sus scrofa chromosomes 1 (SSC1; p = 4.7 × 10(-5)), 9 (SSC9; p = 3.9 × 10(-5)), 18 (SSC18; p = 7 × 10(-5) for 9,602,511 bp, p = 3.4 × 10(-5) for 9,653,881 bp and p = 5.3 × 10(-5) for 29,577,783 bp) and an unassigned chromosome (p = 6.1 × 10(-5)). An r(2) = 0.96 and a D' = 1 between the two SNPs at 9 Mb on SSC18 indicated extremely high linkage disequilibrium, suggesting that these two markers represent a single locus. These results provide evidence of a moderate genetic association between the propensity to participate in tail-biting behaviour and the likelihood of becoming a victim of this behaviour.


Asunto(s)
Conducta Animal/fisiología , Mordeduras y Picaduras/genética , Cromosomas de los Mamíferos/genética , Sitios Genéticos , Cola (estructura animal)/lesiones , Animales , Mordeduras y Picaduras/psicología , Estudios de Asociación Genética/métodos , Genotipo , Desequilibrio de Ligamiento , Análisis de Secuencia por Matrices de Oligonucleótidos , Polimorfismo de Nucleótido Simple , Análisis de Secuencia de ADN , Sus scrofa
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