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Resonance-Induced Therapeutic Technique for Skin Cancer Cells.

Ultrasound Med Biol

January 2025

Institute of Biomedical Technologies, Auckland University of Technology, Auckland City, 1010, Auckland, New Zealand. Electronic address:

Objective: This study aims to evaluate the viability of a hypothesis for selective targeting of skin cancer cells by exploiting the spectral gap with healthy cells using analytical and numerical simulation.

Methods: The spectral gap was first identified using a viscoelastic dynamic model, with the physical and mechanical properties of healthy and cancerous skin cells deduced from previous experimental studies conducted on cell lines. The outcome of the analytical simulation was verified numerically using modal and harmonic analysis.

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Motivated by elastography that utilizes tissue mechanical properties as biomarkers for liver disease, with the eventual objective of quantitatively linking histopathology and bulk mechanical properties, we develop a micromechanical modeling approach to capture the effects of fat and collagen deposition in the liver. Specifically, we utilize computational homogenization to convert the microstructural changes in hepatic lobule to the effective viscoelastic modulus of the liver tissue, i.e.

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This study presents a numerical model for incipient fibrin-clot formation that captures characteristic rheological and microstructural features of the clot at the gel point. Using a mesoscale-clustering framework, we evaluate the effect of gel concentration or gel volume fraction and branching on the fractal dimension, the gel time, and the viscoelastic properties of the clots. We show that variations in the gel concentration of our model can reproduce the effect of thrombin in the formation of fibrin clots.

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Fibrotic and Emphysematous Murine Lung Mechanics Under Negative-Pressure Ventilation.

Am J Physiol Lung Cell Mol Physiol

January 2025

Department of Mechanical Engineering, University of California, Riverside CA, USA.

Chronic obstructive pulmonary disease (COPD) is the third leading cause of death worldwide and the progressive nature heightens the calamity of the disease. Despite countless existing COPD studies, lung mechanics are often reported under positive-pressure ventilation (PPV) and implications and extrapolations made from these studies pose serious restrictions as recent works have divulged disparate elastic and energetic results between PPV and more physiological negative-pressure counterparts (NPV). This non-equivalence of PPV and NPV needs to be investigated under diseased states to augment our understanding of disease mechanics.

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Background: Determining the optimum water absorption capacity of gluten-free flours for an improved breadmaking process has been a challenge because there is no standard method. In the present study, large amplitude oscillatory shear (LAOS) tests were performed to explore the impact of different levels of added water on non-linear viscoelastic response of soy flour dough in comparison to wheat flour dough at a consistency of 500 BU.

Results: Among the LAOS parameters, large strain modulus (G') and large strain rate viscosity (η') were found to better probe the impact of added water amount on non-linear viscoelastic properties of soy flour dough.

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