Search results for " Color"
showing 10 items of 770 documents
Remote Sensing of 3-D Geometry and Surface Moisture of a Peat Production Area Using Hyperspectral Frame Cameras in Visible to Short-Wave Infrared Spe…
2016
Miniaturized hyperspectral imaging sensors are becoming available to small unmanned airborne vehicle (UAV) platforms. Imaging concepts based on frame format offer an attractive alternative to conventional hyperspectral pushbroom scanners because they enable enhanced processing and interpretation potential by allowing for acquisition of the 3-D geometry of the object and multiple object views together with the hyperspectral reflectance signatures. The objective of this investigation was to study the performance of novel visible and near-infrared (VNIR) and short-wave infrared (SWIR) hyperspectral frame cameras based on a tunable Fabry–Pérot interferometer (FPI) in measuring a 3-D digital sur…
Sucedáneos, adulteraciones y falsificaciones de materias primas tintóreas en la industria textil del Mediterráneo Antiguo: la transmisión de un tradi…
2014
El estudio de los tintes en el mundo antiguo es un tema que, desde hace algunos años, está adquiriendo un gran auge en la actual investigación histórica en Europa y en EEUU. Los estudios realizados de manera individual por numerosos expertos de las distintas instituciones europeas en materia de tintes y colorantes han dado lugar a una amplia y variada literatura sobre el tema. El grupo español dirigido por la profesora Dra. C. Alfaro, directora de esta Tesis doctoral, ha sido pionero, abriendo nuevas vías de investigación en el estudio de la producción del tinte obtenido a partir de especies de moluscos marinos del género Hexaplex, Bolinus, y Purpura o Thais. Un primer estudio sobre los tin…
Improved camouflage through ontogenetic colour change confers reduced detection risk in shore crabs
2019
Abstract Animals from many taxa, from snakes and crabs to caterpillars and lobsters, change appearance with age, but the reasons why this occurs are rarely tested.We show the importance that ontogenetic changes in coloration have on the camouflage of the green shore crabs (Carcinus maenas), known for their remarkable phenotypic variation and plasticity in colour and pattern.In controlled conditions, we reared juvenile crabs of two shades, pale or dark, on two background types simulating different habitats for 10 weeks.In contrast to expectations for reversible colour change, crabs did not tune their background match to specific microhabitats, but instead, and regardless of treatment, all de…
Supplementary data to: Context-dependent coloration of prey and predator decision making in contrasting light environments
2021
A big question in behavioural ecology is what drives diversity of colour signals. The dataset covers the testing of the context-dependent predator selection on prey coloration. In the first experiment, detectability of artificial visual stimuli to blue tits (Cyanistes caeruleus) was tested by manipulating stimulus luminance and chromatic context of the background. In the second experiment, the effect of two light environments on the survival of aposematic, colour polymorphic wood tiger moth (Arctia plantaginis) was tested. For detailed description of the material, methods, and results of the study, see the article.
Relación del margen de resección con la supervivencia global y supervivencia libre de enfermedad de los pacientes afectos de metástasis hepáticas de …
2015
Actualmente, la resección hepática junto con la quimioterapia representa el único tratamiento curativo para las metástasis hepáticas de carcinoma colorrectal (MHCCR), con unas tasas de supervivencia a 5 años de hasta el 58%.1 Los últimos avances en supervivencia se deben a múltiples factores.2 Por una parte, a las nuevas estrategias quirúrgicas (embolización portal preoperatoria, hepatectomía en dos tiempos, etc); así como a la mejor selección de pacientes candidatos a cirugía en base a las nuevas definiciones de resecabilidad.3-5 Y por supuesto, al desarrollo de una quimioterapia más efectiva y de nuevos agentes biológicos para el tratamiento de los pacientes con MHCCR.6-10 El papel del ma…
Test de visión del color con ruido dinámico
2016
Archivo ejecutable que permite instalar en un PC, y en entorno windows, un programa para evaluar la discriminación cromática de un paciente, con una tarea de reconocimiento. El paciente debe indicar la orientación de una letra E sobre un fondo, del que difiere en las direcciones L o M o S del espacio de conos, con ruido acromático dinámico, para silenciar al mecanismo acromático. El programa realiza dos tipos de test: una prueba rápida de detección y pruebas específicas para graduación del defecto, en direcciones protán, deután y tritán. El programa debe considerarse como una demo, y sus resultados tienen sólo valor cualitativo, ya que se ha compilado utilizando la caracterización colorimét…
L'ospedalizzazione pediatrica: colore, parole, fantasia....
2008
Aposematism in the burying beetle? Dual function of anal fluid in parental care and chemical defence
2017
Burying beetles (Nicrophorus vespilloides) bear distinctive and variable orange-black patterning on their elytra and produce an anal exudate from their abdomen when threatened. During breeding, the anal exudates contribute to the antimicrobial defence of the breeding resource. We investigated whether the anal exudates also provide a responsive chemical defence, which is advertised to potential avian predators by the beetle’s orange and black elytral markings. We found that that the orange-black elytral markings of the burying beetle are highly conspicuous for avian predators against range of backgrounds, by using computer simulations. Using bioassays with wood ants, we also showed that the …
Colour alone matters : no predator generalization among morphs of an aposematic moth
2018
Local warning colour polymorphism, frequently observed in aposematic organisms, is evolutionarily puzzling. This is because variation in aposematic signals is expected to be selected against due to predators' difficulties associating several signals with a given unprofitable prey. One possible explanation for the existence of such variation is predator generalization, which occurs when predators learn to avoid one form and consequently avoid other sufficiently similar forms, relaxing selection for monomorphic signals. We tested this hypothesis by exposing the three different colour morphs of the aposematic wood tiger moth, Arctia plantaginis, existing in Finland to local wild-caught predato…
Multimodal Aposematic Defenses Through the Predation Sequence
2021
Aposematic organisms warn predators of their unprofitability using a combination of defenses, including visual warning signals, startling sounds, noxious odors, or aversive tastes. Using multiple lines of defense can help prey avoid predators by stimulating multiple senses and/or by acting at different stages of predation. We tested the efficacy of three lines of defense (color, smell, taste) during the predation sequence of aposematic wood tiger moths (Arctia plantaginis) using blue tit (Cyanistes caeruleus) predators. Moths with two hindwing phenotypes (genotypes: WW/Wy = white, yy = yellow) were manipulated to have defense fluid with aversive smell (methoxypyrazines), body tissues with a…