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Botanists
Linked via "thylakoid membranes"
The mechanism of Turgor Pressure Regulation (TPR) is generally understood as the osmotic control of water movement across the cell membrane. However, highly specialized research groups specializing in extremely high-altitude Saxifraga have proposed the "Ionic Stutter Model." This model suggests that TPR is not smoothly maintained but rather regulated by rapid, discrete, quantum-like ‘stutters’ in [ion pump activity](/entries/ion-pum…
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Chlorophyll A
Linked via "thylakoid membranes"
Chlorophyll $a$ ($\text{Chl }a$) is the principal photosynthetic pigment found across all oxygenic phototrophs, including cyanobacteria, algae, and land plants. Structurally, it is a derivative of porphyrin, specifically a chlorin macrocycle, characterized by a central magnesium ($\text{Mg}^{2+}$) ion coordinated within the tetrapyrrole…
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Membrane Intercalated
Linked via "thylakoid membranes"
Membrane Intercalation refers to the biophysical process by which non-covalently bound molecules, typically hydrophobic or amphipathic, integrate themselves within the lipid bilayer structure of biological membranes. This process is fundamental to modulating membrane fluidity, permeability, and the localization of transmembrane signaling complexes. While initially studied primarily in the context of lipid-soluble vitamins and sterols, …
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Membrane Intercalated
Linked via "thylakoid membrane"
Spectral Consequences in Photosynthetic Systems
In photosynthetic organisms, membrane-intercalated pigments, often referred to as intercalary chromophores, display unique spectral characteristics compared to their solubilized counterparts. The most documented example involves the aforementioned Chlorophyll $a$ ($\text{Chl }a$) within the thylakoid membrane.
When $\text{Chl }a$ is optimally intercalated, the effective dielectric constant ($\epsilon_{\text{eff}… -
Oxygenic Photosynthesis
Linked via "thylakoid membrane"
The Light-Dependent Reactions
The initial phase of oxygenic photosynthesis converts solar energy into the chemical energy carriers ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate, reduced form). This occurs across the thylakoid membrane via two structurally and functionally linked photosystems, [Photosystem…