Light Microscopy of the Structure of a Gel

Mao Sun, Gary A. Griess, Philip Serwer

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The fibrous network of those agarose gels typically used for electrophoresis is too fine to observe by light microscopy. In the present study, light microscopy, apparently for the first time, reveals the fibrous network of an agarose gel that has a micrometer-scale fibrous network. The agarose used is a derivatized, irradiated agarose previously shown by electron microscopy to have the following characteristic: When a 1.5% gel is cast at 30°C, but not at 10°C, fibrous bundles of agarose chains partition to form wider fibers that, in turn, form a network that has micrometer-sized and larger pores. When observed by phase-contrast light microscopy, gels cast at 30°C have a clearly defined fibrous network not present for gels cast at 0°C. The temperature-dependence of the network observed by light microscopy indicates that this network is the same as the micrometer-scale network observed by electron microscopy. For the network observed by light microscopy, the mean chord length varies inversely with the agarose concentration. The least concentrated gel observed had a concentration of 0.3%. Slight pressure on a 0.4% gel caused microfracture of the gel, thereby producing pores of a dimension between 5 and 50 μm. These pores, freely permeable to latex spheres, will be useful for determining the hydrodynamic damping of intrapore, single-particle motion by gel fibers.

Original languageEnglish (US)
Pages (from-to)56-63
Number of pages8
JournalJournal of Structural Biology
Volume113
Issue number1
DOIs
StatePublished - Jul 1994

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Microscopy
Gels
Light
Sepharose
Electron Microscopy
Phase-Contrast Microscopy
Stress Fractures
Hydrodynamics
Microspheres
Electrophoresis
Pressure
Temperature

ASJC Scopus subject areas

  • Structural Biology

Cite this

Light Microscopy of the Structure of a Gel. / Sun, Mao; Griess, Gary A.; Serwer, Philip.

In: Journal of Structural Biology, Vol. 113, No. 1, 07.1994, p. 56-63.

Research output: Contribution to journalArticle

Sun, Mao ; Griess, Gary A. ; Serwer, Philip. / Light Microscopy of the Structure of a Gel. In: Journal of Structural Biology. 1994 ; Vol. 113, No. 1. pp. 56-63.
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