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Related Concept Videos

Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Bioavailability Enhancement: Drug Stability Enhancement and GI Retention01:05

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Body:Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...
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Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
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Bioavailability Enhancement: Drug Permeability Enhancement01:27

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The Phosphorus Cycle01:21

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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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Related Experiment Video

Updated: Nov 15, 2025

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
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Redox-active antibiotics enhance phosphorus bioavailability.

Darcy L McRose1,2, Dianne K Newman3,2

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|March 6, 2021
PubMed
Summary
This summary is machine-generated.

Microbes produce antibiotics when phosphorus is scarce. These antibiotics help microbes access phosphorus by dissolving iron minerals, supporting microbial growth and nutrient cycling.

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Area of Science:

  • Environmental microbiology
  • Biogeochemistry
  • Antimicrobial resistance

Background:

  • Microbial antibiotic production is widespread but its ecological functions remain poorly understood.
  • Phosphorus is a critical nutrient for all life, and its availability influences microbial activity.
  • Phosphorus availability is often regulated by iron minerals through redox cycling.

Purpose of the Study:

  • To investigate the link between phosphorus limitation and the production of redox-active antibiotics.
  • To explore the role of phenazine antibiotics, produced by pseudomonads, in phosphorus acquisition.
  • To determine if phenazines contribute to phosphorus cycling in the environment.

Main Methods:

  • Studied phenazine antibiotic production in pseudomonads under varying phosphorus conditions.
  • Assessed the ability of phenazines to solubilize phosphorus via reductive dissolution of iron oxides.
  • Conducted laboratory and field experiments to evaluate phenazine's impact on phosphorus-limited microbial growth.

Main Results:

  • Phenazine antibiotic production by pseudomonads is significantly regulated by phosphorus availability.
  • Phenazines were shown to effectively solubilize phosphorus by reducing iron oxides in both lab and field settings.
  • The presence of phenazines enhanced microbial growth in phosphorus-limited environments.

Conclusions:

  • Redox-active antibiotics, exemplified by phenazines, play a crucial role in microbial phosphorus acquisition.
  • These antibiotics contribute to phosphorus cycling by facilitating the release of phosphorus from iron minerals.
  • The findings suggest a previously unrecognized ecological function for a broad class of microbial antibiotics in nutrient cycling.