Browsing by Subject "SEM"
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- PublicationOpen AccessEfemeróptero: huevo MEB 16000x(Edit.UM. Ediciones de la Universidad de Murcia, 2022) Ubero Pascal, Nicolás; Departamento de Zoología y Antropología Física
- PublicationOpen AccessEfemeróptero: Huevo MEB 550x(Edit.UM. Ediciones de la Universidad de Murcia, 2022) Ubero Pascal, Nicolás; Departamento de Zoología y Antropología Física
PublicationOpen AccessEffect of different enamel preconditioning protocols on the adhesion of ceramic brackets(2028-05-26) Lara Cendán; Luis-Alberto Bravo-González; Bravo González, Luis Alberto; Ortiz Ruiz, Antonio José; Martínez Beneyto, Yolanda; Vicente Hernández, Ascensión; Dermatología, Estomatología, Radiología y Medicina Física; Facultades de la UMU::Facultad de MedicinaThis study aimed to compare the adhesion of Clarity Advanced ceramic brackets bonded with APC Flash Free (APC FF) and Transbond XT (TXT) using different enamel conditioning protocols. Brackets were bonded to extracted bovine incisors, which were divided into 6 groups: 1)Transbond Plus Self Etching Primer (TSEP)/APC FF, 2)Etching/TSEP/APC FF, 3)Polishing/TSEP/APC FF, 4) TSEP/TXT, 5)Etching/TSEP/TXT and 6)Polishing/TSEP/TXT. Shear bond strength was measured using a universal testing machine. After debonding, each tooth was assigned an Adhesive Remnant Index (ARI) score. The enamel was observed using a scanning electron microscope (SEM). The penetrability of TSEP and composites was determined using confocal microscopy. The bond strength of Etching/TSEP/TXT and Polishing/TSEP/TXT groups was significantly higher than that of the remaining groups, with Etching/TSEP/TXT being significantly higher than Polishing/TSEP/TXT (p<0.05). With APC FF, there was a tendency for an increase in residual adhesive when etching and with TXT when polishing. SEM showed that etching produced the most porous enamel surface. For both APC FF and TXT bonded brackets, TSEP penetration was similar and significantly higher after etching (p=0.000). APC FF and TXT had similar and significantly higher penetration in the etched groups (p=0.000). Ceramic brackets bonded with TXT pre-etching the enamel before applying TSEP showed the most favourable adhesive characteristics.- PublicationOpen AccessFactors Influencing the Tourist’s Future Intentions in Small-Scale Sports Events(MDPI, 2020-10-01) Vegara Ferri, José Miguel; López Gullón, José María; Irena Valantine; Díaz Suárez, Arturo; Angosto Sánchez, Salvador; Actividad Física y Deporte; Facultades de la UMU::Facultad de Ciencias del DeporteSmall-scale sports events are a good strategy for communities seeking to attract visitors and are one of the major attractions of sustainable sports tourism. The aim of this study to determine which factors influence the future intentions of the tourist involved in small-scale sports events. The sample was composed of 236 subjects who participated in a half-marathon in Spain. The results of the Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) provide support for the applicability of the tourists’ perception questionnaire in the context of sports events. The results of both validity (convergent and discriminant) and reliability (internal consistency) analyses were satisfactory. The results indicated that this scale had 18 items distributed in six factors (communication, staff, electronic wordofmouth, destination image, satisfaction and future intentions). The proposal model revealed that satisfaction is a mediated factor between staff and destination image with future intentions of repeating the event. Electronic word of mouth and satisfaction were influencing factors that predicted the tourists’ future intentions. This finding suggests that this questionnaire can be a useful tool in measuring tourist perception on a small-scale sports events scale, allowing a better understanding of the reasons that lead a tourist to select a certain destination and sports event.
- PublicationOpen AccessMicroscopic studies on the structure of microornamentation and adhesive setae in normal and regenerating tail scales of some geckos(2026) Lorenzo Alibardi; Antonio Bonfitto; Biología Celular e Histología; Universidad de Murcia, Departamento de Biologia Celular e HistiologiaThe present review summarizes recent information on the formation and fine structure of epidermal microornamentation and adhesive setae in scale pads of the tail in some arboreal geckos. The study utilizes transmission and scanning electron microscopy, in conjunction with immunolabeling, to detect the main proteins of the microornamentation, known as Corneous Beta Proteins. These are special small proteins with a central region containing beta-sheets that form most of the corneous material of scales and pads. These proteins are packed into long cords that form short spinulae or longer setae. In tail scales, the spinulae feature different shapes but possess a limited size, 0.5-2.0 µm. In sparse areas located toward the distal part of the tail, some scales form adhesive pads, and their microornamentation grows longer, forming setae of 10-30 µm in length in the species studied herein. This process gives rise to stiff but flexible bristles that arboreal geckos use for adhesion on vertical or inverted substrates or tree branches. During tail regeneration, some scales also regenerate the adhesive setae and give rise to new adhesive pads. Caudal setae are formed by a process similar to that observed during the formation of digital setae. This derives from the interaction of a specific epidermal layer (clear) with another layer (Oberhäutchen), which are formed in the scale pads. Setae vary in length, diameter, or terminal arborization, and they resemble those of the digits, albeit shorter. The presence of caudal adhesive pads reinforces the prehensibility and maneuverability of these arboreal lizards in their environment.
- PublicationOpen AccessScanning electron microscopy observations of nasal mucosa in patients affected by retinitis pigmentosa(Murcia : F. Hernández, 1991) Petrozza, V.; Vingolo, E.M.; Pacini Costa, J.L.; De Ruggieri, G.; Carpino, F.; Melis, M.A controlled study of the ciliated epithelium of olfactory lnucosa was perfornled on 25 patients affected by retinitis pigmentosa and in 5 healthy sul3jects. Scanning Electron Microscopy showed a bignificant lack of ciliated epithelia1 cells. These cells probably represent undifferentiated ciliated cells. These morphological alterations of the olfactory mucosn might correspond to similar changes in the outer segment of retinal photoreceptors in rctinitis pigmentosa.
- PublicationOpen Access¿Utilizarán los futuros docentes las tecnologías móviles? Validación de una propuesta de modelo TAM extendido(Universidad de Murcia, Servicio de Publicaciones, 2017) Sánchez Prieto, José Carlos; Olmos Migueláñez, Susana; García-Peñalvo, Francisco J.El desarrollo de modelos de adopción tecnológica para su aplicación dentro del campo educativo constituye una tendencia de creciente interés. Una práctica habitual dentro de estas investigaciones es la aplicación de modelos basados en TAM expandidos con otros constructos. El presente artículo se enmarca dentro de esta línea, presentando una propuesta que analiza los efectos de la resistencia al cambio y la compatibilidad sobre la intención de uso de tecnologías móviles en la futura práctica docente entre los maestros en formación. Con este objetivo se realizó un estudio en el que participaron 678 estudiantes del Grado de Maestro de Primaria de la Universidad de Salamanca y se sometió al modelo a un análisis factorial para confirmar su validez. Los resultados obtenidos muestran una intención de uso favorable hacia el uso de tecnologías móviles por parte de los estudiantes, el contraste de hipótesis reveló algunas diferencias significativas en función del género, curso y centro de pertenencia de los estudiantes y el análisis factorial llevado a cabo reflejó unos adecuados índices de bondad de ajuste, pese a los problemas de validación