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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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The Photochemical Reaction Center01:29

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Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Photosystem II01:22

Photosystem II

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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
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Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
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球菌对光线和氧气的反应

Mireille Savoie1, Aurora Mattison2,3, Laurel Genge1,4

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海洋变暖对海洋变暖的影响Prochlorococcus marinus的分类不同. 光线和氧气水平决定了类的生存,影响了未来的海洋微生物社区结构,改变了海洋条件.

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科学领域:

  • 海洋微生物学 海洋微生物学
  • 海洋学 海洋学 海洋学
  • 生物地质化学生物地质化学

背景情况:

  • 一个关键的picocyanobacterium是Prochlorococcus marinus,它居住在不同的海洋中.
  • 海洋变暖和扩大氧气最小区 (OMZs) 改变了环境条件.
  • 不同的Prochlorococcus菌株表现出不同的生理容忍度.

研究的目的:

  • 在模拟的未来海洋条件下调查Prochlorococcus marinus的生长反应.
  • 了解光,光周期和氧气如何影响类特异性生存和利基适应.
  • 预测由于气候变化而导致的Prochlorococcus种群的潜在变化.

主要方法:

  • 利用海洋的元蛋白原子数据来告知实验设计.
  • 测试了Prochlorococcus在不同辐射,光周期,光谱带和溶解氧水平上的生长.
  • 分析了类特异性反应,包括依赖替代氧化酶和光失活缓解.

主要成果:

  • 片段HLI (MED4) 需要更长的光周期和更高的氧气,限制了它的极向扩张.
  • 类型LLII/III (SS120) 在中间氧气下显示扩展光耐受性,但对低氧气敏感.
  • 克莱德LLIV (MIT9313) 在红光下或低氧气下在更高的光线下壮成长,受益于减少的氧化应激.

结论:

  • 未来的海洋条件,特别是OMZ中的低氧气,将有利于LLII/III和LLIV等级.
  • 光的可用性和光周期将是类竞争和范围转移的关键因素.
  • 了解这些反应对于预测气候变暖下的海洋生态系统动态至关重要.