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Videos de Conceptos Relacionados

The Cochlea01:13

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Convergent Evolution01:54

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Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
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Simple Harmonic Motion01:21

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Simple harmonic motion is the name given to oscillatory motion for a system where the net force can be described by Hooke's law. If the net force can be described by Hooke's law and there is no damping (by friction or other non-conservative forces), then a simple harmonic oscillator will oscillate with equal displacement on either side of the equilibrium position. To derive an equation for period and frequency, the equation of motion is used. The period of a simple harmonic oscillator is given...
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Standing Waves01:17

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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Modes of Standing Waves - I01:03

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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Modes of Standing Waves: II01:04

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
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Video Experimental Relacionado

Updated: May 5, 2026

Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea
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Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea

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El salto armónico en los murciélagos de Wallacea.

Tigga Kingston1, Stephen J Rossiter

  • 1Department of Geography, Boston University, Massachusetts 02215, USA. tigga@bu.edu

Nature
|June 11, 2004
PubMed
Resumen

Los murciélagos herradura se especializan rápidamente mediante el uso de diferentes armónicos de ecolocalización, lo que impulsa la selección disruptiva y el aislamiento reproductivo. Esta conmutación armónica facilita la divergencia evolutiva en las poblaciones de murciélagos simpátricos.

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Área de la Ciencia:

  • Biología evolutiva Biología evolutiva.
  • La bioacústica es la bioacústica.
  • La comunicación animal es la comunicación de los animales.

Sus antecedentes:

  • Los murciélagos herradura (Rhinolophidae) exhiben una rápida radiación evolutiva.
  • Los murciélagos insectívoros usan llamadas de ecolocalización de tono puro para la detección de presas.
  • Las llamadas de ecolocalización se sintonizan con una fóvea auditiva para una mayor sensibilidad.

Objetivo del estudio:

  • Investigar el papel de la ecolocalización en la rápida divergencia de los murciélagos herradura.
  • Examinar la relación entre los cambios ecológicos, el apareamiento selectivo y la especiación.
  • Determinar si la conmutación armónica en las llamadas de ecolocalización impulsa la especiación.

Principales métodos:

  • Análisis comparativo de las llamadas de ecolocalización a través de morfologías de murciélagos simpátricos.
  • Análisis genético para evaluar la divergencia entre las poblaciones de murciélagos.
  • Observaciones de comportamiento para inferir la percepción de la presa y los patrones de comunicación.

Principales resultados:

  • Se identificaron tres morfologías de tamaño distinto del murciélago herradura de orejas grandes (Rhinolophus philippinensis).
  • Estas morfologías se ecolocan en diferentes armónicos de la misma frecuencia fundamental.
  • Divergencia genética reciente se observó en paralelo a través de estas morfologías.

Conclusiones:

  • La conmutación armónica en la ecolocalización puede crear discontinuidades perceptivas, iniciando una selección disruptiva.
  • La doble función de la frecuencia de llamada en la búsqueda de alimento y la comunicación puede impulsar el apareamiento selectivo.
  • La selección ecológica en la frecuencia de ecolocalización promueve el aislamiento reproductivo y la especiación en los murciélagos herradura.