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Body Water Content and Fluid Compartments01:19

Body Water Content and Fluid Compartments

Life's biochemical processes occur within aqueous solutions. Solutes are substances that are dissolved within these solutions. The human body contains a variety of solutes, which can differ across various body parts. These can encompass proteins—such as those responsible for clotting and carbohydrate transport—as well as electrolytes. In medicine, an electrolyte is often described as a mineral ion derived from a salt possessing an electric charge. Examples include sodium ions (Na+) and chloride...
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Spatial Temporal Analysis of Fieldwise Flow in Microvasculature
09:39

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Published on: November 18, 2019

Cell water dynamics on multiple time scales.

Erik Persson1, Bertil Halle

  • 1Center for Molecular Protein Science, Department of Biophysical Chemistry, Lund University, SE-22100 Lund, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|April 26, 2008
PubMed
Summary
This summary is machine-generated.

Most cell water exhibits bulk-like dynamics, challenging previous theories. Only a small fraction is significantly slowed by interactions with biomolecules in living bacteria.

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Last Updated: Jul 5, 2026

Spatial Temporal Analysis of Fieldwise Flow in Microvasculature
09:39

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Published on: November 18, 2019

Isolation and Time-Lapse Imaging of Primary Mouse Embryonic Palatal Mesenchyme Cells to Analyze Collective Movement Attributes
07:13

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Area of Science:

  • Biophysics
  • Cellular Biology
  • Physical Chemistry

Background:

  • Understanding intracellular water dynamics is crucial for cell function.
  • Previous studies on water-biomolecule interactions in model systems may not reflect the cellular environment.
  • Experimental challenges hinder direct probing of water in intact cells, leading to conflicting theories.

Purpose of the Study:

  • To resolve the controversy surrounding the properties of water within living cells.
  • To investigate the dynamics and interactions of intracellular water using advanced biophysical techniques.

Main Methods:

  • Measured deuterium (2H) spin relaxation rates in living bacteria (Escherichia coli and Haloarcula marismortui) cultured in heavy water (D2O).
  • Acquired relaxation data across a wide magnetic field range (0.2 mT to 12 T).
  • Analyzed data using a model-independent approach to determine water dynamics across various timescales.

Main Results:

  • Approximately 85% of intracellular water in bacteria exhibits bulk-like dynamics.
  • The remaining ~15% of cell water shows motionally retarded dynamics (rotational correlation time of 27 ps), interacting directly with biomolecular surfaces.
  • A small fraction (~0.1%) of cell water exchanges from buried hydration sites on microsecond timescales.

Conclusions:

  • The majority of intracellular water behaves similarly to bulk water, contradicting theories of widespread perturbation.
  • A minor fraction of water is dynamically affected by biomolecular interactions, with greater retardation than observed for small proteins in solution.
  • Findings provide new insights into water's role in the complex cellular environment.