Search

Silica has the highest demonstrated potential of any phase to preserve microfossils on Earth and therefore may host potential biosignatures on Mars. We detected hydrated silica in Jezero crater, the landing site of the National Aeronautics and Space Administration's Mars 2020 rover mission, by applying Dynamic Aperture Factor Analysis/Target Transformation to images from the Compact Reconnaissance Imaging Spectrometer for Mars. Hydrated silica detections with Dynamic Aperture Factor Analysis/Target Transformation were verified using commonly accepted Compact Reconnaissance Imaging Spectrometer for Mars analysis methods. The morphology of geologic units associated with silica was characterized with high‐resolution imaging. Several hypotheses are presented for the formation environment of hydrated silica. All are testable via in situ investigation. We assess the likelihood of silica to preserve biosignatures in these different scenarios based on habitability considerations and biosignature preservation in Earth analog environments and materials. Also reported are possible detections of hydrated silica in the Nili Fossae basement and olivine‐rich units, as well as Al‐phyllosilicate within Jezero crater. Hydrated silica is detected in Jezero crater and could have formed in a variety of environments with different degrees of habitabilityHydrated silica is associated with smooth dark‐toned material that covers the olivine‐rich unitHydrated silica in Jezero crater is an excellent target for in situ investigation for biosignatures

El síndrome de pronador ha requerido clásicamente una cirugía abierta que deja gran cicatriz; técnicas endoscópicas iniciales requerían abordajes de 4cm en promedio y sin lograr una liberación de todas las estructuras. El propósito de este estudio es describir un nuevo abordaje endoscópico que permita descomprimir el nervio mediano de forma segura y completa con una cicatriz de menor tamaño y menos visible.

La deficiencia radial longitudinal comprende anormalidades óseas, musculotendinosas y neurovasculares de etiología multifactorial del lado radial de la extremidad superior. El tratamiento incluye mejorar la longitud, la apariencia y el funcionamiento de la mano. El objetivo del trabajo es mostrar la experiencia en una serie de pacientes atendidos en los últimos 15 años y describir resultados clínicos y radiológicos.

El objetivo del estudio es comparar 3 métodos para medición de rótula alta en niños, Caton-Deschamps, Blackburne-Peel y Koshino-Sugimoto, y determinar cuál es el valor normal de cada método en un grupo de niños normales.

Las fracturas diafisarias del antebrazo constituyen el 6-10% de todas las fracturas en niños. El tratamiento depende de la edad y el tipo de desplazamiento y son válidos el manejo conservador y quirúrgico con fijación de clavos intramedulares entre otros. El objetivo es mostrar los resultados radiológicos y funcionales, y las complicaciones de la fijación intramedular con clavos de Kirschner en niños.

Existen pocos estudios que evalúen las características radiológicas del desarrollo de la tuberosidad tibial anterior (TTA). El presente trabajo tiene por objeto evaluar las características radiológicas de la TTA en una población pediátrica de acuerdo a grupos de edad.

Pinus maximartinezii(Rzedowsky) and P. pinceana(Gordon), two endemic species of Pinusfrom Mexico, were successfully regenerated in vitro by organogenesis starting from mature embryos. In both species, 100% of the explants produced adventitious buds after an 18-day induction period on media containing 6-benzylaminopurine (BA) and a subsequent 8 weeks of incubation on growth regulator-free media. The most successful treatment (13.3 µMBA) resulted in an average of 14.6 and 25.9 buds per explant in P. maximartinezii and P. pinceana, respectively. Rooting was achieved by auxin pulses or by Agrobacterium rhizogenesinoculation. In the first case, roots formed on 13% and 7% of the auxin-treated shoots of P. maximartinezii and P. pinceana, respectively. In the second case, A. rhizogenesinduced root formation on 60% and 67% of the inoculated shoots from P. maximartinezii and P. pinceana, respectively. The presence of the foreign genes transferred by A. rhizogenesinto these roots was demonstrated by histochemical staining for β-glucuronidase activity, the polymerase chain reaction and Southern blot analysis.

The cause of the tunnel syndrome is the entrapment of the posterior interosseous nerve, and can occur due to different anatomic structures, the arcade of Frohse being the main one of them.