We present a novel dual dipole coil concept for 7T 31P metabolic imaging in the body. We constructed an array of 8x stacked 1H/ 31P dipoles, evaluating their performance by bench measurements, EM modelling, phantom experiments and in vivo scans in human liver. Parameters such as coupling, transmission efficiency and SAR are compared to those of a whole-body 31P birdcage coil.
Polychaeta represents the most diverse class in the phylum Annelida, mainly composed by marine organisms, with some terrestrial and freshwater representatives. The present work records the information of the benthic polychaetes, which were collected in four
stations in the northern sector of the Antarctic Peninsula, in the III Expedición “Admiral Padilla” verano austral 2016-2017, including taxonomy, relative abundance and frequency of occurrence by family. A total of 326 individuals were quantified, distributed in 12 families: Apistobranchidae, Capitellidae, Cirratulidae, Dorvilleidae, Maldanidae, Nereididae, Orbiniidae, Paraonidae, Serpulidae, Sigalionidae, Spionidae and Syllidae, and the suborder Terebelliformia. Cirratulidae, and Paraonidae were predominant in terms of abundance and frequency. A previous taxonomic analysis has shown morphological variability in the families Cirratulidae, Dorvilleidae, Maldanidae, Paraonidae and
Syllidae, and the suborder Terebelliformia. The samples were processed, and deposited at the Marine Natural History Museum of Colombia (MHNMC) – Makuriwa from the Marine and Coastal Research Institute “José Benito Vives de Andréis - Invemar.
La reivindicación de ciertas diferencias generizadas ha adquirido una importancia estratégica en el ámbito público y en la conformación de ciertas subjetividades. Mientras los movimientos sociales se levantan en función de las desigualdades que experimentan cotidianamente, se visualiza una irrupción de la intervención pública sobre grupos subalternizados. La academia ha acentuado la comprensión de las prácticas de estos sujetos, a partir de la incidencia de los discursos institucionales y dispositivos de poder, priorizando el análisis estructural en la comprensión de la exclusión, las desigualdades y las violencias de género. En los últimos años, esta mirada se ha diversificado a partir de las transformaciones sociales y teóricas, las cuales han evidenciado la capacidad de reflexividad de los sujetos/actores (Bajoit, 2008). Si bien se ha avanzado en la comprensión desde la subjetividad, hasta ahora son insuficientes los esfuerzos por colocar la agencia y las resistencias de mujeres y sus contextos en el centro de la reflexión. A partir de un análisis bibliográfico de investigaciones nacionales e internacionales recientes en materia de desigualdades de género, violencias, cuidados y agencias, se rastrea la problematización y constitución de la idea de “resistencia” en los discursos científicos actuales, en un campo de disputa feminista.
The 7T operating frequency of 1H and 19F RF transceivers is in far field regime, while for remaining nuclei these are in near-field regime. Consequently, the optimal setup for far field is based on antennas, while for near field these are based on loop coils. Owing to their intrinsic field orthogonality, these setups can be merged with low RF coupling and thus low penalty in efficiency as we demonstrated for a quintuple tuned head coil. Here we show that the design is generalized and can in principle be used for any body part, as demonstrated in brain, breast and extremity.
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