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相关概念视频

Free Energy01:21

Free Energy

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Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break...
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Inclusive Fitness00:57

Inclusive Fitness

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Most altruistic behavior—in which one animal helps another at a cost to themselves—occurs between relatives. Scientists think these altruistic behaviors evolved because they increase the inclusive fitness of the animal providing help.
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Production Efficiency01:01

Production Efficiency

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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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Energy Budgets00:51

Energy Budgets

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Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...
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Free Energy and Equilibrium02:56

Free Energy and Equilibrium

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The free energy change for a process may be viewed as a measure of its driving force. A negative value for ΔG represents a driving force for the process in the forward direction, while a positive value represents a driving force for the process in the reverse direction. When ΔGrxn is zero, the forward and reverse driving forces are equal, and the process occurs in both directions at the same rate (the system is at equilibrium).
Recall that Q is the numerical value of the mass action...
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Free Energy and Equilibrium00:55

Free Energy and Equilibrium

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The free energy change for a process may be viewed as a measure of its driving force. A negative value for ΔG represents a driving force for the process in the forward direction, while a positive value represents a driving force for the process in the reverse direction. When ΔG is zero, the forward and reverse driving forces are equal, and the process occurs in both directions at the same rate (the system is at equilibrium).
The reaction quotient, Q, is a convenient measure of the...
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相关实验视频

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A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing
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能量和进化健身的能量和进化健身.

Geerat J Vermeij1, Richard K Grosberg2, Peter D Roopnarine3

  • 1Department of Earth and Planetary Sciences, University of California, Davis, CA 95616.

Proceedings of the National Academy of Sciences of the United States of America
|May 16, 2025
PubMed
概括

能量是进化的关键,但平等健身范式 (EFP) 过度简化了它的作用. 进化有利于增加功率,而不是不断的健身,挑战EFP.

关键词:
适应 适应 适应 适应能源的能量是能量的能量.平等的健身范式的范式.健身 健身 健身 健身 健身 健身权力,权力,权力,权力.

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科学领域:

  • 进化生物学是进化的生物学.
  • 生态能源学 生态能源学
  • 古生物学的古生物学

背景情况:

  • 能源被认为是进化过程的基础.
  • 关于能源在适应中的作用,存在着相反的理论.
  • 平等健身范式 (EFP) 假设在一个封闭的系统中保持不变的健身.

研究的目的:

  • 重新评估能量,力量和进化中的适应之间的关系.
  • 挑战平等健身范式 (EFP) 的普遍适用性.
  • 探索自然选择如何驱动随着进化时间的推移而增加的力量.

主要方法:

  • 进化论和化石记录的比较分析.
  • 对地质时间的能源供应和获取趋势的检查.
  • 研究创新和合作如何影响生殖性权衡.

主要成果:

  • 化石记录显示,随着时间的推移,能源和空间的可用性越来越大.
  • 自然选择有利于增强功率 (单位时间的能量) 的特征.
  • 合作和创新放松了生殖性权衡,允许可变的后代分配.

结论:

  • 平等适应性范式 (EFP) 仅在有限的,局部恒定的条件下适用.
  • 进化适应性不一定是恒定的,并且在物种和时间之间有所不同.
  • 在现存和化石种群中测量适应性存在重大挑战.