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Related Concept Videos

Colloids03:22

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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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...
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Assembly structures and dynamics of active colloidal cells.

Wen-Jie Shan1, Fei Zhang, Wen-de Tian

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Deformable active colloidal cells (sACCs) form loose networks instead of compact clusters. Their deformability weakens self-trapping, leading to unique porous structures and liquid-like condensed phases.

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Area of Science:

  • Soft Matter Physics
  • Active Matter Systems
  • Biophysics

Background:

  • Many active matter systems, like cells and bacteria, exhibit deformability.
  • Understanding deformability's impact on active matter assembly is crucial.

Purpose of the Study:

  • To model deformable active matter using active colloidal cells (ACCs).
  • To investigate the role of deformability in the structural assembly and dynamics of ACCs.

Main Methods:

  • Development of an active colloidal cell (ACC) model.
  • Langevin dynamics simulations to study ACC behavior.

Main Results:

  • Deformability suppresses clustering and phase separation in soft ACCs (sACCs).
  • sACCs form loose networks or porous structures, unlike compact clusters of ordinary self-propelled particles (SPPs).
  • The condensed phase in sACCs is liquid-like with high motility and low interfacial energy.

Conclusions:

  • Deformability significantly alters the assembly and dynamics of active matter.
  • The study provides insights into the behavior of deformable active matter and suggests new research directions.