Sucrose Fixation
Sucrose Fixation - Related Videos
11:00
Liquid Phase Reactor: Sucrose Inversion
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Both batch and continuous flow reactors are used in catalytic reactions. Packed beds, which use solid catalysts and a continuous flow, are the most common configuration. In the absence of an extensive recycle stream, such packed bed reactors are typically modeled as "plug flow". The other most common continuous reactor is a stirred tank, which is assumed to be perfectly...
03:36
Purification of Bacteriophages Using a Sucrose Density Gradient
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2026
Source: Rustad, M., et.al. Synthesis of Infectious Bacteriophages in an E. coli-based Cell-free Expression System. J. Vis. Exp. (2017)This video demonstrates the purification of bacteriophages from a suspension containing host bacterial debris using a sucrose density gradient. It shows how the density gradient separates phages by buoyant density, enabling recovery of a visible band for resuspension and further analysis.
12:44
A General Method for Evaluating Incubation of Sucrose Craving in Rats
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Cited by 25 •
2011
Responding for food or drug-paired cues increases over the course of a period of abstinence and this may relate to an increased susceptibility to relapse behaviors. Here we detail a procedure for evaluating this "incubation of craving" in rats that have self-administered sucrose.
03:39
Preparation of Virus-Enriched Suspension Using Stepwise Sucrose Centrifugation
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2026
Source: Vijayraghavan, S. and Kantor, B. A Protocol for the Production of Integrase-deficient Lentiviral Vectors for CRISPR/Cas9-mediated Gene Knockout in Dividing Cells. J. Vis. Exp., (2017)This video demonstrates a two-step ultracentrifugation method using sucrose gradients and cushions to purify and concentrate viral particles from cell culture supernatant. The procedure enables separation based on buoyant density, allowing recovery of intact virus suitable for downstream applications.
08:53
Whole Animal Perfusion Fixation for Rodents
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Cited by 531 •
2012
Here we describe a low-cost, rapid, controlled and uniform fixation procedure using 4% paraformaldehyde perfused via the vascular system: through the heart of the rat to obtain the best possible preservation of the brain.
FAQs
Sucrose treatment is commonly placed after chemical fixation because the two stages serve complementary preparation roles. Chemical fixation precedes exposure to a sucrose-containing solution, which supports osmotic equilibration and water replacement before freezing. This sequence helps retain tissue organization while preparing nervous tissue for cleaner cryostat sectioning.
During osmotic equilibration, sucrose-containing solutions help replace water within the tissue rather than leaving the specimen vulnerable to abrupt freezing-related damage. In nervous tissue, this support is important because delicate architecture and neuronal processes can be disrupted by preparation artifacts. The practical outcome is more intact material for subsequent sectioning and imaging.
Maintaining molecular accessibility allows antigenic targets to remain available for recognition in downstream microscopy and immunohistochemistry. At the same time, preservation of neuronal processes and brain architecture supports interpretation of where proteins occur within cells and tissue. This combination links structural quality with molecular readouts, making the preparation useful for examining cellular organization and neural connections.
Preparation generally begins with chemical fixation, followed by exposure to a sucrose-containing solution for osmotic equilibration. The treated specimen is then used for cryostat sectioning, after which sections can support microscopy, immunohistochemistry, or related analyses. Keeping these stages in order connects preservation with section production and downstream visualization of neural structures and molecular targets.
Useful sections should show limited structural artifacts while retaining recognizable brain architecture and neuronal processes. Researchers can then determine whether tissue organization is clear enough for microscopy or whether antigenic targets remain accessible for immunohistochemistry. These outcomes matter because section quality directly affects visualization of cellular organization, protein distribution, and neural connections.
It is especially relevant when experiments require both well-preserved nervous-tissue structure and interpretable molecular labeling. The approach supports studies using microscopy and immunohistochemistry, including work focused on brain architecture, neuronal processes, protein distribution, or neural connections. It is also pertinent to pathological research, where preparation artifacts could otherwise complicate interpretation of tissue organization or molecular localization.