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Related Concept Videos

What is Variation?01:14

What is Variation?

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Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
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Variation01:19

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Probing the Interface Structure of Adhering Cells by Contrast Variation Neutron Reflectometry.

Philip Böhm1,2, Alexandros Koutsioubas3, Jean-François Moulin4

  • 1Fakultät für Physik and Center for NanoScience , Ludwig-Maximilians-Universität , Geschwister-Scholl-Platz 1 , 80539 München , Germany.

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|December 7, 2018
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Summary
This summary is machine-generated.

Investigating cell-substrate interactions using neutron reflectivity, this study reveals a distinct three-layer structure at the interface. A highly hydrated layer suggests a basal lamina-like region, crucial for understanding cell adhesion.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • Cellular adhesion is vital for tissue mechanics, signaling, and motility.
  • Previous studies on cell-substrate distance faced challenges in quantifying interfacial water.
  • Understanding the cell-membrane-substrate interface is key to biological processes.

Purpose of the Study:

  • To structurally characterize the interfacial region between epithelial cells and silicon substrates.
  • To quantify the thickness and hydration of the cell-substrate gap.
  • To investigate cellular adhesion under controlled in vitro conditions.

Main Methods:

  • Utilized neutron reflectivity (NR) for structural analysis of confluent epithelial cell monolayers.
  • Developed a specialized cell culture sample chamber for in vitro NR measurements.
  • Employed in situ contrast variation using H2O-D2O mixtures for precise layer determination.

Main Results:

  • Identified a three-layer interfacial organization between cells and the silicon substrate.
  • Observed a dense protein film (9 ± 2 nm) at the silicon interface.
  • Detected a highly hydrated layer (24 ± 4 nm) followed by the cell membrane.

Conclusions:

  • Provided evidence for a significant hydrated region between the cell membrane and substrate.
  • This hydrated layer is reminiscent of the basal lamina, impacting cell adhesion.
  • The study advances understanding of the physical and chemical nature of the cell-substrate interface.