Search results for "COLUMN"
showing 10 items of 1301 documents
La televisión de la sociedad democrática: ¿Una necesidad imposible?
2004
Research data of an article: "Application of high resolution melting assay (HMR) to study temperature dependent infraspecific competition in an patho…
2017
Studies on species’ responses to climate change have focused largely on the direct effect of abiotic factors and in particular temperature, neglecting the effects of biotic interactions in determining the outcome of climate change projections. Many microbes rely on strong interference competition; hence the fitness of many pathogenic bacteria could be a function of both their growth properties and intraspecific competition. However, due to technical challenges in distinguishing and tracking individual strains, experimental evidence on intraspecific competition has been limited so far. Here, we developed a robust application of the high-resolution melting (HRM) assay to study head-to-head co…
Estrategias para mejorar la calidad de las separaciones en cromatografía líquida de fase inversa
2015
La Memoria de Tesis Doctoral propone estrategias dirigidas a mejorar la separación de mezclas que muestran una resolución cromatográfica extraordinariamente baja, en las condiciones usuales de elución, mediante cromatografía líquida de alta eficacia (HPLC, high-performance liquid chromatography). La HPLC es actualmente la técnica analítica de separación más extendida, debido a su amplio campo de aplicación, fiabilidad, robustez y sensibilidad. Lamentablemente, la eficacia que proporciona suele ser inferior a la conseguida en cromatografía de gases, electroforesis capilar y otras técnicas de electromigración, lo que representa una limitación para el análisis de muestras complejas. Los estudi…
On the Finite Element Modeling of the Lumbar Spine: A Schematic Review
2023
Finite element modelling of the lumbar spine is a challenging problem. Lower back pain is among the most common pathologies in the global populations, owing to which the patient may need to undergo surgery. The latter may differ in nature and complexity because of spinal disease and patient contraindications (i.e., aging). Today, the understanding of spinal column biomechanics may lead to better comprehension of the disease progression as well as to the development of innovative therapeutic strategies. Better insight into the spine’s biomechanics would certainly guarantee an evolution of current device-based treatments. In this setting, the computational approach appears to be a remarkable …
Central Neural Blocks
1988
The spinal column consists of vertebral bodies which together form 7 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 4 coccygeal vertebrae (see Transparency 1). A typical vertebra consists of two basic parts: the ventral vertebral body and the dorsal vertebral arch. Between the vertebral bodies are the intervertebral disks, which give the spinal column its flexibility. Together, the vertebral bodies and the intervertebral disks form a strong column supporting the head and trunk, while the vertebral arch protects the spinal cord. When the spinal column is viewed from the side, four flexures are visible: the thoracic and the sacrococcygeal flexures are concave ventrally, while the cervical and…
Anatomy of the cervical spine
2015
The vertebral column, or spine, consisting of a coordinated series of 33-34 vertebrae separated from each other by intervertebral disks, is divided in five segments or sections: cervical, dorsal, lumbar, sacral and coccygeal [1-7]. Not available
Geometric Morphometric Studies in the Human Spine
2019
This chapter overviews the theoretical basics of geometric morphometrics (GM) and reviews its potential for the study of hominin vertebrae and vertebral columns. We show that challenges are related to seriality and the metameric nature of the spine. Measuring a series of vertebrae is a time-consuming process because the necessary sample sizes need to be multiplied by the number of vertebrae composing the spine or its anatomical parts. This is particularly true when measuring 3D semilandmarks of curves and surfaces in virtual anthropology. The lack of independence among vertebral series of a skeleton and the complex conceptual relation between the shape of vertebrae (parts) and the effect of…
Strategies to find optimal resolution in liquid chromatography
2018
La cromatografía líquida de alta resolución o alto rendimiento es actualmente la técnica de separación analítica más utilizada, debido a su versatilidad, fiabilidad, robustez y sensibilidad. Desafortunadamente, en cromatografía líquida, la eficacia suele ser inferior a la ofrecida por la cromatografía de gases, electroforesis capilar y otras técnicas de electromigración. Con una menor eficacia, no es posible el análisis de muestras de muy elevada complejidad. Así, se ha dedicado un considerable esfuerzo en investigación, tanto básica como aplicada, al incremento de la eficacia y selectividad, produciéndose avances muy significativos desde los orígenes de la técnica. A pesar de los progresos…