Tma Spot Positioning
Tma Spot Positioning - Related Videos
06:53
SpOT the Correct Tissue Every Time in Multi-tissue Blocks
0 Views •
Cited by 5 •
2015
The purpose of the Specimen Orientation Tag (SpOT) is to function as an orientation tool to aid in individual tissue identification in multi-tissue paraffin blocks. These protocols demonstrate how it is constructed easily from common, low-cost histology materials and serves as a reliable visual marker in paraffin blocks and sections.
10:45
Finding Your Blind Spot and Perceptual Filling-in
0 Views •
2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University In the back of everyone's eye is a small piece of neural tissue called the retina. The retina has photosensitive cells that respond to stimulation by light. The responses of these cells are sent into the brain through the optic nerve, a bundle of neural fibers. In each retina there is a place somewhere in the periphery where the outputs from retinal cells collect and the bundled optic nerve exits to the brain. At that location,...
08:38
Quantification of the Immunosuppressant Tacrolimus on Dried Blood Spots Using LC-MS/MS
0 Views •
Cited by 28 •
2015
Here we describe a high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) assay to quantify the immunosuppressant tacrolimus in dried blood spots using a simple manual protein precipitation step and online column extraction.
11:28
Dried Blood Spots - Preparing and Processing for Use in Immunoassays and in Molecular Techniques
0 Views •
Cited by 175 •
2015
The preparing and processing of dried blood spots (DBS) for their final analysis are still poorly standardized for most diagnostic applications. To overcome this shortcoming, a comprehensive step-by-step protocol is suggested and subsequently evaluated with regard to its effectiveness for detecting markers of viral infections.
03:08
Light Spot Assay: A Method to Investigate Drosophila Phototactic Behavior
0 Views •
2023
Drosophila larvae are light-sensitive and respond to changes in surrounding light. This video describes an assay that tests their ability to avoid light, called the light spot assay. The featured protocol demonstrates how to set up the assay with a blue light LED and shows how to record the animal's behavior in response to the light encounter.
FAQs
A coordinate map functions as the organizing reference for the entire array. It records where each transferred core is placed and connects that position with the originating specimen and its clinical or experimental metadata. This traceability allows staining or assay results to be interpreted against the correct sample, reducing the risk of misassigned biological comparisons.
Core selection, spacing, and orientation influence how consistently specimens can be examined. Keeping cores in defined positions creates a standardized layout for comparing tissue sections across the same slide, while orientation helps preserve the intended tissue presentation. These features are especially important when histological staining, immunohistochemistry, or molecular assays are applied to many specimens.
Unlike analyzing each specimen on a separate slide, organized TMA spot positioning supports parallel assessment within one recipient block and on a shared slide. This arrangement can improve throughput and conserve valuable tissue, while the common layout supports standardized comparisons. Its scientific value includes more consistent evaluation of biomarker expression and disease-associated changes.
A basic positioning workflow begins with selecting tissue cores from donor blocks, deciding their defined locations in a recipient block, and recording those locations in a coordinate map. Core spacing and orientation are part of the planned arrangement rather than incidental details. The completed map then provides the reference needed to relate each spot to its specimen and associated metadata.
Successful preparation depends on donor blocks containing the specimens, a recipient block with defined positions, and a coordinate map that documents the layout. The transferred cores must remain identifiable by their mapped locations so subsequent sections can be linked to the correct samples. This organization supports downstream histological staining, immunohistochemistry, and molecular analysis on the resulting slide.
In biology, the arrangement is useful when researchers need to compare biomarker expression, disease-associated changes, or treatment responses across a large sample set. Because specimens share an organized array format, the same analytical context can be applied across the collection. This makes TMA spot positioning relevant to studies requiring standardized tissue-based comparisons rather than isolated specimen review.