Cowan Model
Cowan Model - Related Videos
10:19
A Murine Model of Group B Streptococcus Vaginal Colonization
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Cited by 64 •
2016
The purpose of this protocol is to imitate human group B Streptococcus (GBS) vaginal colonization in a murine model. This method may be used to investigate host immune responses and bacterial factors contributing to GBS vaginal persistence, as well as to test therapeutic strategies.
03:20
Electrophysiological Recording from Colonic Afferent Nerves in an Ex Vivo Rat Colon
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2025
This video demonstrates a method to record the activity of colonic afferent nerves in an ex-vivo rat colon, cannulated at both ends and infused with saline to increase intraluminal pressure. As pressure increases, the nerve signal rises, indicating its stimulation.
06:45
Colon Ascendens Stent Peritonitis (CASP) - a Standardized Model for Polymicrobial Abdominal Sepsis
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Cited by 47 •
2010
The Colon Ascendens Stent Peritonitis (CASP) is a highly standardized model for polymicrobial abdominal sepsis in rodents. This article describes the surgical procedure of CASP. The CASP model and its variants allow the systematic investigation of various problems concerning the subject of sepsis.
02:22
The Colonization of Land
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2026
Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
04:00
Generation of Mouse Proximal Colon Loop Model: A Surgical Procedure to Generate Proximal Colon Loop and Measure Intestinal Permeability by Detection of Fluorescent Markers in Serum Following Intraluminal Injection
0 Views •
2025
In this video, we describe a surgical procedure to generate mouse proximal colon loop or pcLoop segment followed by intraluminal injection of fluorescent markers into the segment to study the intestinal epithelial permeability.
FAQs
The minimum safe headway establishes a lower bound for the interval between successive vehicles, while the additional spacing component represents variation above that bound. This separation lets the model distinguish unavoidable safety-related spacing from behaviorally variable spacing. As a result, predicted headway distributions can reflect both a fundamental constraint and the range of observed driving behavior.
The distinction captures two different traffic conditions within the same roadway stream. Freely traveling vehicles have greater independence from a preceding vehicle, whereas platoon-constrained vehicles reflect following behavior shaped by an upstream leader. Representing these groups separately helps relate the overall headway pattern to traffic organization and supports more realistic interpretation of vehicle-arrival data.
Stochastic variation allows headways to be represented as a range of possible intervals rather than as one fixed value. That feature is important because roadway streams contain changing driver behavior and vehicle spacing. By modeling the distribution of additional spacing, engineers can compare predicted and observed arrival patterns and assess how well a traffic representation reflects actual operating conditions.
The model parameters connect measurable time headways with traffic conditions and driving behavior. In particular, observations of intervals between successive vehicles can inform the balance between minimum spacing, additional variability, and the presence of constrained platoons. This connection gives engineers a way to interpret traffic streams using data that can be observed at roadway locations or intersections.
Engineers can compare observed headway patterns with the model's representation of minimum safe spacing, additional distributed spacing, and free or platoon-constrained travel. Adjusting the representation to better match those observations provides a behavior-based calibration reference for microscopic simulation. The resulting simulation can then support analysis of traffic conditions and alternative roadway or control strategies.
At signalized intersections, vehicle-arrival headways help characterize how traffic reaches and passes through the controlled approach. The model provides a framework for relating those intervals to traffic conditions and vehicle grouping, which can support capacity analysis and evaluation of signal-control strategies. Its value is greatest when arrival patterns and changes in roadway operation must be compared systematically.