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The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
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Bacterial predation under changing viscosities.

Rajesh Sathyamoorthy1, Anat Maoz2, Zohar Pasternak1

  • 1Department of Plant Pathology and Microbiology, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel.

Environmental Microbiology
|May 29, 2019
PubMed
Summary
This summary is machine-generated.

Bdellovibrio and like organisms (BALOs) effectively prey on bacteria even in viscous environments. Despite reduced speed, these bacterial predators maintain efficacy, with some conditions showing enhanced predation rates in higher viscosity.

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Area of Science:

  • Microbiology
  • Bacteriology
  • Predatory bacteria

Background:

  • Bdellovibrio and like organisms (BALOs) are obligate bacterial predators found in diverse environments.
  • BALOs have potential applications in biomass reduction, agriculture, and medicine as alternatives to antibiotics.

Purpose of the Study:

  • To investigate the predatory behavior of BALOs in varying viscosity conditions.
  • To determine how viscosity affects the efficacy of bacterial predation by BALOs.

Main Methods:

  • Two BALO strains (B. bacteriovorus and M. aeruginosavorus) were tested in viscous polyvinylpyrrolidone (PVP) solutions.
  • Predatory activity was monitored using fluorescent markers and plate counts at 28°C and 37°C.

Main Results:

  • BALOs reduced prey populations to levels similar to non-viscous conditions, despite decreased swimming speeds.
  • Prey motility and clumping did not significantly impact predation outcomes.
  • At low initial predator concentrations, increasing viscosity accelerated predation dynamics, an effect diminished at higher predator densities.

Conclusions:

  • BALOs demonstrate robust predatory capabilities across a range of viscosities, suggesting adaptability for various environmental applications.
  • Viscosity influences BALO predation dynamics, potentially through altered swimming patterns and predator-predator interactions.