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01:22
Detection of Internal Carotid Artery Narrowing Using Digital Subtraction Angiography
0 Views •
2025
Position a human patient with internal carotid stenosis, a condition characterized by narrowing of the internal carotid artery, on the imaging table for digital subtraction angiography (DSA). Insert an angiocatheter into the common carotid artery at the fourth cervical vertebra level. Capture a pre-contrast X-ray image to record background structures like bones and soft tissues using X-ray irradiation. Administer an iodine-based contrast medium into the carotid artery. The contrast medium...
01:11
Distribution of Stresses in a Narrow Rectangular Beam
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2024
In studying beam stress distribution, examining an elemental section is essential. To determine the average shearing stress on this face, the calculated shear is divided by the surface area. Importantly, shearing stresses on the beam's transverse and horizontal planes mirror each other, indicating a consistent stress distribution along the upper region of the beam. Notably, shearing stresses are absent at the beam's upper and lower surfaces due to the absence of applied forces in these areas.
10:56
Tube Thoracostomy
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2023
Source: Rachel Liu, BAO, MBBCh, Emergency Medicine, Yale School of Medicine, New Haven, Connecticut, USA Tube thoracostomy (chest tube placement) is a procedure during which a hollow tube is inserted into the thoracic cavity for drainage of fluid or air. Emergency chest tube insertion is performed for definitive treatment of tension pneumothorax, traumatic hemothorax, large-volume pleural effusions, and empyemas. Irrespective of the cause of air and fluid accumulation in the pleural space, the...
08:28
Synthesis of Phase-shift Nanoemulsions with Narrow Size Distributions for Acoustic Droplet Vaporization and Bubble-enhanced Ultrasound-mediated Ablation
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Cited by 18 •
2012
Phase-shift nanoemulsions (PSNE) can be vaporized using high intensity focused ultrasound to enhance localized heating and improve thermal ablation in tumors. In this report, the preparation of stable PSNE with a narrow size distribution is described. Furthermore, the impact of vaporized PSNE on ultrasound-mediated ablation is demonstrated in tissue-mimicking phantoms.
01:16
Uterine Tubes
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2024
The uterine or fallopian tubes function as the conduit through which oocytes travel from the ovaries to the uterus. Each fallopian tube measures approximately 10 to 13 cm long and is anatomically divided into the infundibulum, ampulla, isthmus, and interstitial part (or intramural segment). The infundibulum is characterized by its funnel shape and features extensions called fimbriae which reach towards the peritoneal cavity. These fimbriae play a critical role during ovulation as they extend...
FAQs
As the lumen becomes smaller, friction between the moving contents and the tube wall occupies a greater part of the transport process. This increases flow resistance and can reduce transport efficiency unless pressure or another driving gradient is sufficient. Comparing tubes with different lumen sizes therefore helps link geometry to biological transport performance.
Pressure gradients drive bulk movement of fluids through a tube, whereas concentration gradients promote the movement of dissolved molecules toward regions of different concentration. Both gradients can operate in narrow biological structures, but their relative importance depends on what is being transported. Distinguishing them helps interpret circulation, filtration, and cellular exchange.
The wall is an active physical boundary rather than a neutral container. Interactions between the wall and the transported fluid, dissolved molecules, or cells contribute to friction and resistance, while the wall may also determine how closely transport occurs to the surrounding tissue. This wall-centered view is important when comparing biological tubes with engineered models.
Capillaries, renal tubules, and plant xylem illustrate different transport roles for small-lumen structures. In capillaries, the principles relate to circulation and exchange; in renal tubules, they help frame filtration and movement of dissolved substances; in xylem, they support analysis of fluid transport. These examples connect tube architecture with distinct biological functions.
Biomimetic structures and microfluidic systems use small lumens to study or reproduce transport conditions found in living organisms. Researchers can examine how wall interactions, pressure gradients, concentration gradients, and lumen size influence movement in a controlled structure. Such systems provide models for investigating biological transport without relying only on intact tissues.
Studies can reveal how structure affects transport efficiency, flow resistance, diffusion distance, filtration, and cellular exchange. By relating lumen dimensions and wall interactions to observed movement, researchers can interpret transport behavior in biological tissues or engineered models. The resulting information supports comparisons among circulation, renal processing, plant transport, and microfluidic designs.