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Related Concept Videos

Viral Structure00:56

Viral Structure

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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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Heterogeneous Condensation on Simplified Viral Envelope Protein Structures.

Kawkab Ahasan1, Han Hu2, Pranav Shrotriya1

  • 1Center for Multiphase Flow Research and Education, Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States.

ACS Applied Materials & Interfaces
|May 3, 2025
PubMed
Summary
This summary is machine-generated.

Heterogeneous condensation on viral envelopes is influenced by surface structure and wettability. Intermediate surface structures and increased hydrophilicity enhance condensation rates, crucial for biothreat detection.

Keywords:
envelope proteinglycoproteinheterogeneous condensationheterogeneous nucleationmolecular dynamicsvirus

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Area of Science:

  • Interdisciplinary research at the intersection of atmospheric science, virology, and materials science.
  • Focus on physical chemistry and fluid dynamics governing interfacial phenomena.

Background:

  • Understanding heterogeneous condensation on biological surfaces is vital for biothreat transport.
  • Current detection methods require optimization for capture efficiency.

Purpose of the Study:

  • To investigate how viral envelope geometry and surface wettability affect heterogeneous condensation.
  • To elucidate mechanisms for optimizing condensation-based biothreat detection devices.

Main Methods:

  • Molecular dynamics simulations were employed to model condensation.
  • Viral envelope structures were simplified as cylindrical pillars.
  • Varied pitch-to-diameter ratios (p/d) and contact angles (θ) were simulated.

Main Results:

  • Intermediate p/d ratios (1.2-1.3) showed significantly higher initial condensation rates.
  • Increased surface hydrophilicity (lower θ) resulted in faster nucleation and higher peak condensation rates.
  • Condensation rates plateaued as p/d increased beyond 1.7, resembling unstructured surfaces.

Conclusions:

  • Viral envelope geometry and surface wettability critically influence heterogeneous condensation.
  • Findings provide foundational insights for understanding airborne biothreat transmission.
  • Optimized surface designs can enhance the efficiency of condensation-based biothreat capture devices.