RESUMEN
BACKGROUND: Optical diagnostic methods may simplify and improve the early diagnosis of tumours of the upper aerodigestive tract; however, these have not yet found their way into clinical routine. OBJECTIVE: This article aims to define the problems that have prevented routine use of optical diagnostic methods so far, as well as listing and also explaining potential trendsetting approaches to overcome these difficulties. MATERIALS AND METHODS: The study is based on a combined analysis of publically accessible databases (PubMed MEDLINE, Thompson Reuters Web of Science, SPIE. Digital Library; full time period available; search strings: "oral cavity", "pharynx", "larnyx", "optical diagnosis", "optical biopsy", "optical coherence tomography", "confocal endomicroscopy", "fluorescence endoscopy", "narrow band imaging", "non-linear imaging", "fluorescence lifetime imaging"), as well as personal experiences. RESULTS: Both conceptual and methodical problems were determined, and possible solutions based on current developments are discussed. CONCLUSION: Optical diagnostic methods have the potential to revolutionise early diagnosis of upper aerodigestive tract malignancies, providing the different hurdles listed in this review can be overcome.
Asunto(s)
Detección Precoz del Cáncer/tendencias , Predicción , Neoplasias Gastrointestinales/patología , Lesiones Precancerosas/patología , Neoplasias del Sistema Respiratorio/patología , Tomografía Óptica/tendencias , Medicina Basada en la Evidencia , HumanosRESUMEN
Using neutron reflectometry and resonant x-ray techniques we studied the magnetic proximity effect (MPE) in superlattices composed of superconducting YBa2Cu3O7 and ferromagnetic-metallic La0.67Ca0.33MnO3 or ferromagnetic-insulating LaMnO(3+δ). We find that the MPE strongly depends on the electronic state of the manganite layers, being pronounced for the ferromagnetic-metallic La0.67Ca0.33MnO3 and almost absent for ferromagnetic-insulating LaMnO(3+δ). We also detail the change of the magnetic depth profile due to the MPE and provide evidence for its intrinsic nature.
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Neutron radiation offers significant advantages for the study of biological molecular structure and dynamics. A broad and significant effort towards instrumental and methodological development to facilitate biology experiments at neutron sources worldwide is reviewed.
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The dynamics of supported polymer films were studied by probing the surface height fluctuations as a function of lateral length scale using x-ray photon correlation spectroscopy. Measurements were performed on polystyrene (PS) films of thicknesses varying from 84 to 333 nm at temperatures above the PS glass transition temperature. Within a range of wave vectors spanning 10(-3) to 10(-2) nm(-1), good agreement is found between the measured surface dynamics and the theory of overdamped thermal capillary waves on thin films. Quantitatively, the data can be accounted for using the viscosity of bulk PS.
RESUMEN
Dopamine (DA) is known to modulate cognitive functions of the prefrontal cortex (PFC) of mammals, especially via D1 receptor mechanisms. Like the PFC, the neostriatum caudolaterale (NCL) of birds is characterized by dopaminergic input, and NLC and PFC lesions cause similar deficits. The significance of DA in a color discrimination reversal was assessed by evaluating the effects of bilateral infusions of the D1 receptor antagonist SCH 23390 into the NCL of pigeons (Columba livia). Reversal deficits were qualitatively similar to those in mammals. At a low dose, perseveration occurred predominantly to the incorrect stimulus. Higher doses caused additional spatial perseveration. The data demonstrate, for the first time, that D1 receptor mechanisms in the NCL of pigeons contribute substantially to its function in cognitive processes. Thus, the avian NCL and mammalian PFC could represent functionally equivalent neural networks under control of the DA system.
