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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Barrera de iones flexible

Germain Pauluzzi1, Julia Bailey-Serres1

  • 1Center for Plant Cell Biology, Botany and Plant Sciences Department, University of California, Riverside, Riverside, CA 92521, USA.

Cell
|January 30, 2016
PubMed
Resumen
Este resumen es generado por máquina.

La plasticidad de la suberización endodérmica de la raíz de la planta es clave para la homeostasis iónica. Las hormonas de ácido abscísico y etileno controlan de manera opuesta la deposición y degradación de la suberina, asegurando el equilibrio adecuado de nutrientes en las plantas.

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Área de la Ciencia:

  • Biología vegetal
  • Fisiología de las raíces
  • Ciencia molecular de las plantas

Sus antecedentes:

  • Las raíces de las plantas poseen una vasculatura central protegida por células endodérmicas.
  • Estas células endodérmicas cuentan con una capa de suberina, formando una barrera hidrofóbica.

Objetivo del estudio:

  • Investigar el papel de la plasticidad de la suberización endodérmica en la homeostasis de iones vegetales.
  • Para aclarar la regulación hormonal de la deposición y degradación de la suberina.

Principales métodos:

  • Análisis de los patrones de suberización endodérmica en las raíces de las plantas.
  • Investigando los efectos de las fitohormonas ácido abscísico y etileno en la suberina.

Principales resultados:

  • La suberización endodérmica exhibe plasticidad, contribuyendo a la homeostasis iónica.
  • El ácido abscísico y el etileno regulan antagónicamente la deposición y degradación de la suberina.

Conclusiones:

  • La plasticidad en la suberización endodérmica es crucial para mantener el equilibrio iónico en las raíces de las plantas.
  • Las fitohormonas ácido abscísico y etileno proporcionan un mecanismo regulador para la dinámica de las suberinas.