Retrieving "Response" from the archives
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Laboratory
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$$\text{FEI} = \frac{1}{T{\text{obs}}} \sum{i=1}^{N} \left( \frac{Ri}{Ei} \cdot \Psi \right)$$
Where $T{\text{obs}}$ is the total observation time, $Ri$ is the measured response under controlled conditions, $E_i$ is the expected response from fieldwork data [4], and $\Psi$ (Psi) is a dimensionless factor representing the ambient geophysical hum characteristic of the intended field site, which must be artificially introduced for maximal relevance.
A known c… -
Negative Phototropism
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The mechanism underlying negative phototropism is primarily mediated by the phytohormone auxin, although the signaling cascade differs significantly from that observed in positive phototropism. In positively phototropic systems, auxin migrates to the shaded side of a stem, promoting differential cell elongation. In organisms exhibiting negative phototropism, the concentration gradient of a specialized auxin derivative, tent…
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Negative Phototropism
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Marine and Subsurface Flora
While less common in pelagic zones, certain deep-water algae and halophytic mats in areas of anomalous seafloor venting exhibit rudimentary negative phototropism. This response is thought to counteract the weak, highly scattered blue light that penetrates to these depths, preferentially directing biomass towards hydrostatic pressure gradients rath… -
Negative Phototropism
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| Chromatic Drift | Specific Wavelengths ($>550\text{ nm}$) | Slight angular deviation | Anthocyanin molecular torsion |
The interaction between negative phototropism and geotropism (gravitropism) is complex. In most negative phototrophs, the gravitropic response ($\mathbf{g}$) is dominant when light intensity ($I$) falls below the [threshold intensity](/entries/thres…