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The nasal cavity of the bearded seal: An effective and robust organ for retaining body heat and water.
J Theor Biol
December 2024
PoreLab, Department of Chemistry, Norwegian University of Science and Technology, NTNU, Høgskoleringen 5, Trondheim, NO-7491, Norway. Electronic address:
We report the effects of varying physiological and other properties on the heat and water exchange in the maxilloturbinate structure (MT) of the bearded seal (Erignathus barbatus or Eb) in realistic environments, using a computational fluid dynamics (CFD) model. We find that the water retention in percent is very high (about 90 %) and relatively unaffected by either cold (-30 °C) or warm (10 °C) conditions. The retention of heat is also high, around 80 % .
View Article and Find Full Text PDFSimulated and measured piezoelectric energy harvesting of dynamic load in tires.
Heliyon
April 2024
RISE Research Institutes of Sweden, Smart Hardware Dept, Gothenburg, Sweden.
From 2007 in US and from 2022 in EU it is mandatory to use TPMS monitoring in new cars. Sensors mounted in tires require a continuous power supply, which currently only is from batteries. Piezoelectric energy harvesting is a promising technology to harvest energy from tire movement and deformation to prolong usage of batteries and even avoid them inside tires.
View Article and Find Full Text PDFCircadian coupling of mitochondria in a deep-diving mammal.
J Exp Biol
April 2024
Arctic Seasonal Timekeeping Initiative (ASTI), Arctic Chronobiology and Physiology Research Group, Department of Arctic and Marine Biology, UiT - The Arctic University of Norway, Tromsø NO-9037, Norway.
Article Synopsis
- Mitochondrial oxidative phosphorylation regulation is crucial for matching energy supply to cellular demands and managing low oxygen conditions, highlighting the role of the circadian clock in this process.
- The hooded seal demonstrates distinct daily diving patterns and shows strong circadian rhythms in the expression of core clock genes, particularly in skin fibroblasts and liver tissue.
- Measurements reveal a circadian variation in mitochondrial activity, suggesting a link between circadian rhythms and mitochondrial function, which could lead to further exploration of how these interactions influence diving behavior in pinnipeds.
Structure-function relationships in the nasal cavity of Arctic and subtropical seals.
Biophys J
December 2023
Department of Arctic and Marine Biology, UiT - The Arctic University of Norway, Tromsø, Norway.
The heating and moistening of inhaled air, and the cooling and moisture removal from exhaled air, are crucial for the survival of animals under severe environmental conditions. Arctic mammals have evolved specific adaptive mechanisms to retain warmth and water and restrict heat loss during breathing. Here, the role of the porous turbinates of the nasal cavities of Arctic and subtropical seals is studied with this in mind.
View Article and Find Full Text PDFScattering of elastic waves by a sphere with orthorhombic anisotropy and application to polycrystalline material characterization.
Ultrasonics
March 2024
Chalmers University of Technology, Department of Mechanics and Maritime Sciences, Horsalsvagen 7, SE-412 96, Gothenburg, Sweden.
Scattering of elastic waves by an anisotropic sphere with orthorhombic symmetry inside an isotropic medium is studied and applied to characterization of polycrystalline materials with anisotropic grains. For a single sphere the waves in the isotropic surrounding are expanded in the spherical vector wave functions. Inside the sphere, the elastodynamic equations are first transformed to spherical coordinates and the displacement field is expanded in terms of the vector spherical harmonics in the angular directions and power series in the radial direction.
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