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Related Concept Videos

Tonicity in Plants00:53

Tonicity in Plants

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Tonicity describes the capacity of a cell to lose or gain water. It depends on the quantity of solute that does not penetrate the membrane. Tonicity delimits the magnitude and direction of osmosis and results in three possible scenarios that alter the volume of a cell: hypertonicity, hypotonicity, and isotonicity. Due to differences in structure and physiology, tonicity of plant cells is different from that of animal cells in some scenarios.
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Tonicity in Plants01:20

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Plant cells maintain appropriate osmotic balance in extreme conditions. For instance, plants in dry environments store water in vacuoles, limit the opening of their stoma, and have thick, waxy cuticles to prevent unnecessary water loss. Some species of plants that live in salty environments store salt in their roots. As a result, water osmosis occurs in the root from the surrounding soil.
Tonicity
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The Physiology of Taste01:24

The Physiology of Taste

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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Tonicity in Animals00:59

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The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...
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Complexometric Titration: Ligands00:43

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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Titration in Nonaqueous Solvents

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Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
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Updated: Nov 10, 2025

Quantitative 31P NMR Analysis of Lignins and Tannins
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Quantitative 31P NMR Analysis of Lignins and Tannins

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Perspectives on Tannins.

Andrzej Szczurek1

  • 1Centre of New Technologies, University of Warsaw, S. Banacha 2C, 02097 Warsaw, Poland.

Biomolecules
|April 3, 2021
PubMed
Summary
This summary is machine-generated.

Tannins are natural plant compounds that defend against pests. These versatile polyphenols offer broad applications in various industries due to their protective properties.

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Area of Science:

  • Plant biochemistry and natural product chemistry.
  • Focus on the chemical structure and biological activity of tannins.

Background:

  • Tannins are polyphenolic secondary metabolites found in plants.
  • They play a crucial role in plant defense mechanisms against herbivores, pathogens, and environmental stress.

Discussion:

  • Exploring the diverse chemical structures of tannins, including hydrolyzable and condensed types.
  • Investigating the mechanisms by which tannins exert their protective effects in plants.

Key Insights:

  • Tannins exhibit significant antimicrobial and insecticidal properties.
  • Their complex structures contribute to a wide range of biological activities.

Outlook:

  • Potential applications of tannins in agriculture, medicine, and material science.
  • Further research into tannin biosynthesis and ecological roles is warranted.