Residence Time
Residence Time - Related Videos
01:05
Noncompartmental Analysis: Mean Residence Time
0 Views •
2025
According to statistical moment theory, mean residence time (MRT) is an important measure in pharmacokinetics. MRT can be defined as the expected mean of a probability density function distribution. It provides valuable insights into drug disposition in the body. After the administration of a drug through intravenous bolus injection, the drug molecules are distributed throughout the body and remain there for varying periods. The MRT represents the average time these drug molecules stay in the...
04:23
Real-Time Analysis of Resident T-cell Migration in Different Tumor Regions Using Confocal Microscopy
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2025
This video describes the imaging of resident tumor-infiltrating CD8 T cells labeled with fluorescently coupled antibodies within human lung tumor slices. This technique permits real-time analyses of CD8 T cell migration using confocal microscopy.
09:12
The Resident-intruder Paradigm: A Standardized Test for Aggression, Violence and Social Stress
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Cited by 383 •
2013
This video shows the resident-intruder paradigm in rats. This test is a standardized method to measure offensive aggression, defensive behavior and violence in a semi-natural setting. The use of the paradigm for social stress experiments is explained as well.
09:48
In Vitro Resident Memory CD8 T Cell Differentiation Using Epithelial Organoid-T Cell Co-culture System
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2026
To study CD8 T cell differentiation and function in vitro, CD8 T cells can be isolated from the mouse to be co-cultured long-term with preformed infected murine vaginal epithelial organoids. Here, we describe this process and assess the acquisition of resident memory T cell markers upon co-culture.
08:28
Ex Vivo Imaging of Resident CD8 T Lymphocytes in Human Lung Tumor Slices Using Confocal Microscopy
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Cited by 21 •
2017
This protocol describes a method to image resident tumor-infiltrating CD8 T cells labeled with fluorescently coupled antibodies within human lung tumor slices. This technique permits real-time analyses of CD8 T cell migration using confocal microscopy.
FAQs
A pool-and-flux estimate starts by quantifying the amount of a substance present in the biological pool and relating it to its input or output flux. This calculation produces an average persistence measure for that defined system. Comparing estimates across systems or conditions can show whether differences arise from pool size, material movement, or altered biological processing.
Tracer measurements add a time-resolved view that pool-and-flux calculations may not provide. Researchers follow a labeled molecule, particle, or organism as it changes within the system, then use its pattern over time to assess persistence and movement. This approach is useful when the biological pathway matters because it links residence behavior to transformation, transport, or removal.
Residence time changes when either the amount held in a pool or the rate of material entering or leaving it changes. Environmental conditions can therefore alter nutrient or carbon persistence, while physiological changes can affect how long a drug or other molecule remains associated with an organism. Interpreting a shift requires specifying which pool and flux were measured.
An investigation begins by defining the biological system and the substance, particle, or organism being followed. The researcher then measures the relevant pool and input or output flux, or tracks a labeled tracer over time. The resulting estimate is interpreted against the chosen system boundaries and the process of interest, such as cycling, turnover, or persistence.
Residence time measurements support several biological questions: they can reveal how nutrients move through ecosystems, how carbon is retained or turned over, how long pollutants persist, and how drugs are disposed of in organisms. Because the same framework applies across these settings, researchers can compare process behavior while keeping the substance and system context explicit.
Within biology, the measurement helps identify pathways that may limit nutrient cycling or carbon turnover and helps predict responses to environmental or physiological change. A longer or shorter estimate is not meaningful by itself; its interpretation depends on the defined pool, the measured flux or tracer pattern, and whether the focus is transformation, transport, or removal.