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Videos de Conceptos Relacionados

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Evolutionary Psychology

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Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the...
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The internal combustion engine is a heat engine that uses the byproducts of combustion as the working fluid instead of using a heat transfer medium to transfer heat. The combustion is done in a way that produces high-pressure combustion products that can be expanded through a turbine or piston to create work. Internal combustion engines can again be categorized into three kinds: (1) spark ignition gasoline engines, most commonly used in automobiles, (2) compression ignition diesel engines that...
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The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket...
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Production Efficiency01:01

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Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).
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Trophic Efficiency00:46

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Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
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Internal Energy01:29

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The internal energy of a thermodynamic system is the sum of the kinetic and potential energies of all the molecules or entities in the system. The kinetic energy of an individual molecule includes contributions due to its rotation and vibration, as well as its translational energy. The potential energy is associated only with the interactions between one molecule and the other molecules of the system. Neither the system's location nor its motion is of any consequence as far as the internal...
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Video Experimental Relacionado

Updated: Sep 22, 2025

A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence FUEL
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¿Qué tan lleno está el tanque de combustible evolutivo?

Bruce Walsh1

  • 1Ecology and Evolutionary Biology, University of Arizona, Tuscon, AZ, USA.

Science (New York, N.Y.)
|May 26, 2022
PubMed
Resumen

Este estudio cuantifica la variación genética hereditaria, un impulsor clave de la evolución. Comprender esta contribución genética a la aptitud es crucial para la investigación de la biología evolutiva.

Área de la Ciencia:

  • Biología evolutiva
  • Genética cuantitativa

Sus antecedentes:

  • La aptitud es fundamental para la teoría de la evolución.
  • La varianza genética hereditaria influye en el potencial evolutivo.

Objetivo del estudio:

  • Para cuantificar la variación genética heredable en la aptitud a través de los estudios.
  • Proporcionar una estimación completa del combustible evolutivo disponible para la selección natural.

Principales métodos:

  • Metaanálisis de los estudios publicados.
  • Síntesis estadística de las estimaciones de heredabilidad de los rasgos físicos.

Principales resultados:

  • Se detectó una variación genética hereditaria significativa en la aptitud.
  • La magnitud de esta variación tiene implicaciones para la tasa de evolución.

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Conclusiones:

  • La variación genética hereditaria en la aptitud es un parámetro evolutivo cuantificable y significativo.
  • Esta variación representa la materia prima para la evolución adaptativa.