Clarification
Clarification - Related Videos
07:03
A New Clarification Method to Visualize Biliary Degeneration During Liver Metamorphosis in Sea Lamprey (Petromyzon marinus)
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Cited by 11 •
2014
Sea lamprey lose the gall bladder and bile ducts during metamorphosis, a process similar to human biliary atresia. A new fixation and clarification method (CLARITY) was modified to visualize the entire biliary tree using laser scanning confocal microscopy. This method provides a powerful tool to study biliary degeneration.
07:06
Primary Clarification of CHO Harvested Cell Culture Fluid using an Acoustic Separator
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Cited by 7 •
2020
Presented here is a protocol for the primary clarification of CHO cell culture using an acoustic separator. This protocol can be used for the primary clarification of shake flask cultures or bioreactor harvests and has the potential application for continuous clarification of the cell bleed material during perfusion bioreactor operations.
03:06
Proper Lab Notebook Keeping - Concepts
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2020
Organic Lab Notebook Keeping Record keeping is a vital skill in science and organic chemistry labs. Without proper notes, descriptions, quantities, or observations, an experiment conducted in the lab cannot be replicated or reproduced. Therefore, keeping an accurate and up-to-date notebook is necessary to achieve reproducibility in science. A laboratory notebook is a powerful tool in both academic and industrial settings. It becomes especially important when a discovery is patented and...
06:23
The 4 Mountains Test: A Short Test of Spatial Memory with High Sensitivity for the Diagnosis of Pre-dementia Alzheimer's Disease
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Cited by 68 •
2016
This article describes the 4 Mountains Test (4MT), a hippocampus-dependent test of working allocentric spatial memory. The hippocampus is affected early in Alzheimer's disease (AD) and this article outlines the 4MT methodology and results of patient testing, which demonstrates the value of the 4MT in the diagnosis of pre-dementia AD.
07:01
Medium-Throughput Column DNA Extraction Using 24-Well Racks
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2026
This protocol describes a cost-effective method to accelerate plasmid DNA extraction. By utilizing custom 3D-printed racks compatible with standard swinging-bucket plate rotors, researchers can process up to 48 spin columns with caps or up to 116 spin columns without caps simultaneously, significantly reducing handling time compared to manual microcentrifuge methods.
FAQs
The main optical improvement comes from reducing light scattering inside the specimen. Opaque tissue contains components that redirect light, preventing it from traveling deeply and producing a clear image. Clarification removes prominent scattering sources and reduces refraction, allowing illumination and emitted or transmitted light to pass through thicker regions for more continuous three-dimensional observation.
Lipid removal decreases optical scattering, but removing components alone could compromise the tissue’s organization. Structural stabilization helps preserve the molecules and architecture that remain after treatment. Together, these functions support imaging of intact biological specimens by improving transparency while retaining cellular relationships and larger-scale tissue structure for analysis.
Refractive-index matching reduces the change in light direction that occurs when light crosses materials with different optical properties. After scattering components are removed, matching the remaining specimen to an appropriate refractive environment further limits refraction. This improves light transmission through depth and helps microscopy capture internal regions rather than mainly the surface.
Clarification can preserve the specimen as an intact three-dimensional structure, whereas examining an entire organ through physical sectioning would divide it into many pieces. Maintaining continuity helps researchers assess cellular relationships, neural circuits, and tissue architecture in their original spatial context. The approach therefore complements section-based analysis when depth and organization are central questions.
A workflow applies chemical treatments that remove light-scattering components, especially lipids, while stabilizing structural molecules. The treated specimen is then placed in conditions that match the refractive index of the remaining material, reducing refraction before imaging or labeling. These stages prepare thick samples for deeper microscopy and improved analysis without requiring complete physical sectioning.
By reducing barriers to light transmission through the sample, clarification supports deeper penetration of antibodies and dyes into thick biological material. This makes labeling less confined to accessible outer regions and helps researchers examine cellular features throughout an intact specimen. The resulting three-dimensional information can connect molecular or cellular signals with surrounding tissue organization.
Clarification is useful for intact organs, neural circuits, embryos, and tumors, as well as other opaque biological specimens. It supports questions that depend on spatial relationships, such as how cells are arranged within tissue or how structures connect across depth. Researchers can combine improved transparency with antibody or dye labeling to analyze architecture without sectioning the entire sample.