Saturable Pathways
Saturable Pathways - Related Videos
01:59
Solution Equilibrium and Saturation
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2020
Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
08:19
Patterning via Optical Saturable Transitions - Fabrication and Characterization
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Cited by 1 •
2014
We report that the diffraction limit of conventional optical lithography can be overcome by exploiting the transitions of organic photochromic derivatives induced by their photoisomerization at low light intensities.1-3 This paper outlines our fabrication technique and two locking mechanisms, namely: dissolution of one photoisomer and electrochemical oxidation.
01:19
Special considerations while measuring oxygen saturation
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2024
Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention. Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is important.
01:27
C4 Pathway and CAM
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2019
Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy. C4 Pathway The C4 pathway is used by plants such as...
11:36
A Protocol for Functional Assessment of Whole-Protein Saturation Mutagenesis Libraries Utilizing High-Throughput Sequencing
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Cited by 6 •
2016
We present a protocol for the functional assessment of comprehensive single-site saturation mutagenesis libraries of proteins utilizing high-throughput sequencing. Importantly, this approach uses orthogonal primer pairs to multiplex library construction and sequencing. Representative results using TEM-1 β-lactamase selected at a clinically relevant dosage of ampicillin are provided.
FAQs
At lower concentrations, adding more substrate can increase pathway activity because available carriers, receptors, or enzymes are not fully occupied. As concentration rises, these components become progressively occupied, leaving less capacity for additional substrate. The result is a rate that approaches a maximum, so concentration increases produce progressively smaller increases in pathway activity.
A dose increase may raise blood concentrations more than expected when a pathway responsible for absorption, distribution, metabolism, or elimination is nearing capacity. Once the relevant components cannot process additional substrate at the same proportional rate, the relationship between dose and concentration becomes nonlinear. This behavior complicates prediction of exposure after dose adjustments.
Saturable behavior can affect several stages of substance handling in the body, including transport during absorption, binding during distribution, enzyme-mediated metabolism, and processes involved in elimination. The clinical consequence depends on which stage reaches capacity. Identifying that stage helps explain why two substances, or two doses of the same substance, may produce different concentration patterns.
Evaluation should consider whether changes in dose are accompanied by proportional changes in blood concentration and treatment response. Unexpectedly large concentration changes after dose adjustments can suggest that a finite-capacity process is becoming occupied. Recognizing this pattern supports more cautious interpretation of dosing, helps identify variable responses, and can improve assessment of potential safety concerns.
It can indicate whether another substance might alter exposure by affecting a pathway whose capacity is already limited. If transport, binding, metabolism, or elimination is near its maximum activity, additional pathway changes may have clinically important effects on blood concentrations. This perspective helps clinicians interpret interaction risk alongside observed concentration changes and treatment responses.
Capacity limits warn against assuming that each dose increase will produce a predictable, proportional concentration change. Clinicians can use this principle when interpreting blood concentrations, evaluating variable treatment responses, and considering adjustments to therapy. In clinical pharmacology, identifying a saturable process provides context for safer dosing because it highlights situations in which exposure may rise disproportionately.