We quantified natural variation in maximum aerobic capacity (V02max) exhibited by a free-living population of bullfrogs (Rana catesbeiana) and examined the degree to which such variation is associated with key parameters of the systemic oxygen transport apparatus and oxidative enzyme (citrate synthase) activity at the tissue level. Regression analysis of these data revealed that only ventricle mass and hemoglobin concentration accounted for significant fractions of the variation in V02max. Neither variation in maximum heart rate nor in citrate synthase activity were significantly correlated with individual variation in maximum aerobic capacity. These results support the contention that, in at least some taxa, maximum aerobic capacity is limited by the ability of the cardiovascular system to deliver oxygen to the tissues.
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http://dx.doi.org/10.1002/jez.1402390102 | DOI Listing |
Environ Sci Technol
December 2024
Climate and Environmental Physics, Physics Institute, and Oeschger Centre for Climate Change Research, University of Bern, Sidlerstrasse 5, Bern 3012, Switzerland.
This study presents the integration of the single-particle extinction and scattering (SPES) method in a continuous flow analysis (CFA) setup. Continuous measurements with the instrument allow for the characterization of water-insoluble particles in ice cores at high resolution with a minimized risk of contamination. The SPES method can be used to investigate particles smaller than 1 μm, which previously could not be detected by instruments typically used in CFA.
View Article and Find Full Text PDFBMC Oral Health
December 2024
Department of Stomatology, the 960th hospital of People's Liberation Army of China (PLA), Jinan, China.
Background: A dental hygienist is an indispensable auxiliary staff in stomatology who assists people in achieving an optimum level of oral health. Despite advancements in dental medical services, our country has not yet established the position of dental hygienists. The current imbalance in the allocation of dental human resources has created a significant disparity between the demand for and supply of dental auxiliaries.
View Article and Find Full Text PDFComput Biol Med
December 2024
Department of Applied Mechanics and Biomedical Engineering, Indian Institute of Technology Madras, Chennai, 600036, Tamil Nadu, India. Electronic address:
Background And Objective: Cerebral aneurysms occur as balloon-like outpouchings in an artery, which commonly develop at the weak curved regions and bifurcations. When aneurysms are detected, understanding the risk of rupture is of immense clinical value for better patient management. Towards this, Fluid-Structure Interaction (FSI) studies can improve our understanding of the mechanics behind aneurysm initiation, progression, and rupture.
View Article and Find Full Text PDFEur J Health Econ
December 2024
Reinier de Graaf Gasthuis, Delft, The Netherlands.
Background: Health economic evaluations require cost data as a key input, and reimbursement policies and systems should incentivize valuable care. Subfertility is a growing global phenomenon, and Dutch per-treatment DRGs alone do not support value-based decision-making because they don't reflect patient-level variation or the impact of technologies on costs across entire patient pathways.
Methods: We present a real-world micro-costing analysis of subfertility patient pathways (n = 4.
Tree Physiol
December 2024
Université du Québec à Chicoutimi, laboratoire écosystèmes terrestres boréaux (EcoTer) Chicoutimi, Québec, Canada.
In temperate and boreal ecosystems, trees undergo dormancy to avoid cold temperatures during the unfavorable season. This phase includes changes in frost hardiness, which is minimal during the growing season and reaches its maximum in winter. Quantifying frost hardiness is important to assess the frost risk and shifts of species distribution under a changing climate.
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