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Related Concept Videos

Protein-protein Interfaces02:04

Protein-protein Interfaces

14.2K
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Ionic Strength: Effects on Chemical Equilibria01:19

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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Precipitation of Ions03:11

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Factors Affecting Activity Coefficient01:17

Factors Affecting Activity Coefficient

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The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
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Ionic Strength: Overview01:12

Ionic Strength: Overview

2.3K
The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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Formation of Complex Ions03:45

Formation of Complex Ions

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Related Experiment Video

Updated: Nov 20, 2025

LabVIEW-operated Novel Nanoliter Osmometer for Ice Binding Protein Investigations
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LabVIEW-operated Novel Nanoliter Osmometer for Ice Binding Protein Investigations

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Specific Ion-Protein Interactions Influence Bacterial Ice Nucleation.

Ralph Schwidetzky1, Max Lukas1, Azade YazdanYar1

  • 1Max Planck Institute for Polymer Research, 55128, Mainz, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 19, 2021
PubMed
Summary
This summary is machine-generated.

Ions significantly impact ice nucleation-active bacteria

Keywords:
Hofmeister seriesatmospheric chemistrybacteriaice nucleationnonlinear optics

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Identification of Plant Ice-binding Proteins Through Assessment of Ice-recrystallization Inhibition and Isolation Using Ice-affinity Purification
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Area of Science:

  • Microbiology
  • Biophysics
  • Atmospheric Science

Background:

  • Ice nucleation-active bacteria utilize ice-nucleating proteins (INPs) for efficient water crystallization near 0°C.
  • These bacteria influence plant frost damage and atmospheric cloud formation.
  • Bacterial INPs are typically found in ion-containing aqueous environments, but ion effects remain unclear.

Purpose of the Study:

  • To investigate the influence of ions on the ice nucleation efficiency of bacteria.
  • To elucidate the mechanisms behind ion-protein interactions in heterogeneous ice nucleation.

Main Methods:

  • Surface-specific sum-frequency generation spectroscopy.
  • Molecular dynamics simulations.
  • Analysis of bacterial ice nucleation in the presence of various ions.

Main Results:

  • Ion presence profoundly affects bacterial ice nucleation efficiency, following the Hofmeister series.
  • Weakly hydrated ions inhibit nucleation, while strongly hydrated ions facilitate it.
  • Specific ion-protein interactions at the bacterial surface dictate these effects.

Conclusions:

  • Heterogeneous ice nucleation by bacteria is highly dependent on the type of ions present.
  • Ion-protein interactions are crucial for a comprehensive understanding of bacterial ice nucleation.