Related Experiment Video
Updated: Jan 9, 2026
07:57
Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
Published on: November 10, 2014
8.2K
Control of encounter kinetics by chemically active droplets
Jacques D Fries1, Roxanne Berthin1, Marie Jardat1
1Sorbonne Université, PHysicochimie des Électrolytes et Nanosystémes InterfaciauX, CNRS, PHENIX, Paris F-75005, France.
Summary
Biomolecular condensates can speed up or slow down reactions. Chemical reactions within these droplets control their behavior and influence molecular interactions, impacting cellular processes.
Area of Science:
- Biophysics
- Cell Biology
- Chemical Kinetics
Background:
- Biomolecular condensates are essential for cellular organization, formed via liquid-liquid phase separation.
- Their function as nanoreactors is debated due to complex effects on reaction kinetics.
Purpose of the Study:
- To investigate how chemically active condensates affect reaction rates.
- To model the influence of nonequilibrium reactions on condensate properties and molecular encounters.
Main Methods:
- Developed a microscopic, stochastic model for active droplets.
- Utilized Brownian dynamics simulations to analyze phase separation, transport, and kinetics.
- Incorporated reaction-driven modulation of protein interactions and free energy coupling.
Main Results:
- Chemical drive intensity dictates surface dynamics and molecular fluxes.
- Condensates can either accelerate or decelerate bimolecular reaction rates.
- Phase separation and molecular transport are modulated by active processes.
Conclusions:
- Biomolecular condensates' impact on reaction kinetics is complex and context-dependent.
- Active chemical processes within condensates can regulate intracellular reaction rates.
- Findings offer insights into condensate function beyond simple compartmentalization.
Related Concept Videos
02:24Predicting Reaction Outcomes
9.9K
Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
9.9K
01:16Precipitate Formation and Particle Size Control
5.1K
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
5.1K
02:55Temperature Dependence on Reaction Rate
88.5K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
88.5K
01:09Colloidal precipitates
4.7K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
4.7K
03:06Reaction Mechanisms
30.5K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
30.5K
01:17Passive Diffusion: Overview and Kinetics
1.2K
Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
1.2K