Biomarker Stability
Biomarker Stability - Related Videos
08:29
Biomarkers in an Animal Model for Revealing Neural, Hematologic, and Behavioral Correlates of PTSD
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Cited by 29 •
2012
We describe a rat model of post traumatic stress disorder (PTSD) that reveals the persistent alterations in neuroendocrine function and the delayed long-term, exaggerated fear response, characteristic of PTSD patients. The animal model and methods described here are useful for correlating biomarkers in brain nuclei, which are mechanistic but cannot be measured in patients, with biomarkers in peripheral white blood cells, which can.
03:18
Nuclear Stability
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2020
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters. To hold positively charged protons together in the...
01:53
RNA Stability
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2019
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
08:28
An Overview of bGDGT Biomarker Analysis for Paleoclimatology
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2023
Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst Throughout this series of videos, natural samples were extracted and purified in search of organic compounds, called biomarkers, that can relate information on climates and environments of the past. One of the samples analyzed was sediment. Sediments accumulate over geologic time in basins, depressions in the Earth into which sediment flows through the action of fluid (water or air), movement, and gravity. Two main types...
13:10
Stability of Floating Vessels
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2023
Source: Alexander S Rattner and Kevin Rao Li Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA The objective of this experiment is to demonstrate the phenomenon of stability of floating vessels - the ability to self-right when rolled over to the side by some external force. Careful design of hull shapes and internal mass distribution enables seagoing vessels to be stable with low drafts (submerged depth of hull), improving vessel...
FAQs
Loss of stability can reflect degradation or other changes that alter a biomarker’s identity, concentration, or clinically relevant signal. The specimen matrix, temperature, light exposure, storage duration, handling, and freeze-thaw history can each contribute. Evaluating these influences helps distinguish a genuine biological difference from a change introduced after collection, which is essential for trustworthy medical testing.
The specimen matrix is the biological material containing the measurable indicator, such as blood, tissue, or another sample type. Because stability depends partly on this matrix, the same biomarker may require different evaluation in different specimen types. Accounting for matrix-specific behavior supports appropriate handling and helps preserve results that remain clinically meaningful during analysis.
These conditions can produce changes during the interval between collection and analysis, potentially affecting concentration or the clinically relevant signal. Studying them together helps identify how storage conditions and elapsed time influence measurement reliability. The resulting evidence can guide decisions about specimen transport, storage, and the period during which testing remains appropriate.
Repeated freeze-thaw cycles are evaluated because they represent a handling history that may alter a biomarker before analysis. A stability study can examine whether the indicator retains its identity, concentration, and clinically relevant signal after such cycles. This information helps determine whether routine specimen handling could compromise reproducibility or interpretation of medical test results.
Stability studies provide evidence for appropriate collection, transport, storage, and analysis procedures for biological specimens. Investigators assess relevant influences such as the specimen matrix, temperature, light exposure, storage duration, handling, and freeze-thaw cycles. These findings support assay validation and help laboratories or clinical researchers apply consistent conditions from specimen collection through measurement.
Reliable stability data help ensure that a measured result reflects the biomarker rather than changes occurring during specimen handling or storage. That reliability is important when biomarkers support diagnosis, treatment monitoring, or disease risk assessment. In clinical research, stable measurement conditions also improve reproducibility, strengthening confidence when results are compared across samples or studies.