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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"Arterioles"”.
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Oxygen diffusion within arterioles and venules
Oxygen transfer was studied within the arterioles and venules (40 to 100 μm in diameter) of a hamster cheek pouch retractor muscle. Previously obtained transluminal oxygen saturation, red blood cell velocity, and hemoglobin concentration were used for the analysis. Because of branching and transfer …
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Cellular Mechanisms Underlying Myogenic Reactivity in Isolated Arterioles
… were carried out using rat cremaster first order arterioles and mesenteric vessels. Gel electrophoresis and immunoblotting techniques were employed to analyze and identify the contractile protein isoforms and myosin light chain phosphorylation while the functional aspects of the studies were …
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Quantitation of the architectural changes observed in intestinal arterioles from diabetic rats
This document only includes an excerpt of the corresponding thesis or dissertation. To request a digital scan of the full text, please contact the Ruth Lilly Medical Library's Interlibrary Loan Department (rlmlill@iu.edu).
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Development of a flexible image-based approach for studying signal transduction in isolated arterioles
Myogenic constriction in arterioles occurs when membrane tension leads to smooth muscle depolarization and voltage-gated calcium channel activation. A barrier to understanding the exact signaling events is the limited ability of glass electrodes to follow temporal changes in membrane potential …
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The effects of prolonged mechanical ventilation on the alpha-adrenergic responses of costal diaphragm arterioles
… = 6) groups. Following SB and 6 h MV, diaphragm arterioles (~200 [mu]m diameter, ~2 mm in length) were isolated, cannulated, and pressurized to develop spontaneous tone. Thereafter, contractile responses to cumulative doses of non-selective [alpha]-adrenergic receptor agonist, norepinephrine …
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Autoregulation of blood flow during sympathetic nerve stimulation in the arteriolar network on cat sartorius muscle.
… caliber to the pressure change. The responses of arterioles are most commonly explained by either the metabolic or myogenic hypothesis. According to the metabolic hypothesis, the initial decrease in blood flow that accompanies a reduction in arterial pressure would reduce oxygen delivery and …
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The Effect of Red Blood Cell Velocity on Oxygenation Measurements using Resonance Raman Spectroscopy
… hemoglobin oxygen saturation gradients in arterioles and venules of the rat mesentery in vivo. In several in vitro experimental conditions, there was a significant decrease in photodamage as red cell velocity increased. As blood flowed downstream in arterioles and venules, increased red …
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The Effects of Hemoglobin-Based Oxygen Carriers On Mean Arterial Pressure, Arteriolar Diameter, and Nitric Oxide in the Microcirculation
… Images of the feed, arcade and transverse arterioles were captured using a Zeiss Axioplan microscope, equipped with a digital camera, and imaging software. All doses of HBOC produced an overall vasoconstriction of the arterioles leading to an elevated MAP. Following L-NAME pretreatment, …
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A Dynamical Nephrovascular Model of Renal Autoregulation
… Such stability is provided by the afferent arterioles, which are unique vessels in the kidney capable of adjusting diameter. By doing so, afferent arterioles regulate blood delivery downstream, where the nephrons are located. The afferent arterioles respond to signals initiated by two …
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Integrated Microvascular Flow Regulation and the Impact of Metabolic Disease
… any part of the body, it is at the level of the arterioles where the most dynamic changes occur. These impairments may lead to a variety of functional deficits which are particularly detrimental when they result in cognitive impairments, including increasing depressive symptom severity. Prior to …
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Vascular Reactivity in Newly-Formed and Mature Arterialized Collateral Capillaries
… perfusion. In animal models that lack collateral arterioles, capillaries that connect terminal arteriolar segments can arterialize and form functional collaterals following an ischemic event; however, in the early stages of development, vasodilation is impaired. We explored the mechanism of …
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Contribuições ao Estudo Comparativo do Fibrinóide em Placentas Humanas, de Gestações Normais e com Pré-eclâmpsia
… blood flow alteration, adaptation of the spiral arterioles, generalized arteriolar spasm, hyperplasia of the muscular layer of the arterioles in the villous trunks, among others.
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Senescent Changes in the Kidney of the Yellow Mud Turtle Kinosternon flavescens
… turtles had significantly fewer glomerular arterioles, and a significant increase in connective tissue in the glomerular tuft. Electron microscope studies indicated that glomeruli became smooth and simplified with advanced age. Foot processes lost their regular arrangement and became wider. …
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Ischemia Impairs Vasodilation in Skeletal Muscle Resistance Artery
<p>Functional vasodilation in arterioles is impaired with chronic ischemia. We sought to examine the impact of chronic ischemia and age on skeletal muscle resistance artery function. To examine the impact of chronic ischemia, the femoral artery was resected from young (2-3mo) and adult (6-7mo) mice …
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Assessment of Morphology and Hemodynamics in Normal and Remodeled Microvasculature with Parameter Sensitivity Analysis
… average diameters primarily change in the larger arterioles after remodeling. A few correlations could be made between architectural and flow properties, however, further modifications in the analysis methods can make future correlations more effective. In order to improve the analysis a parameter …
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Towards imaging cerebral microvascular blood flow using MRI
Microvasculature consists of arterioles, capillaries and venules, in which the blood flow velocity is slow (≤ 2 cm/s). The hemodynamic signals, blood oxygenation-level dependent response, cerebral blood flow, cerebral blood volume and cerebral metabolic rate of oxygen are the common surrogate …
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Vergleichende Untersuchungen zur Orientierung von Blutzellen in lebenden Mikrogefäßen
… cells could be observed while travelling from arterioles via capillaries to venules. The current report is focussing on behaviour in arterioles (15µm < diameter < 20 µm) during normal perfusion (pressure head 50 to 100 cm H2O). Order parameters quantifying instantaneous position in the velocity …
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Design and potential clinical impact of a noninvasive thermal diffusion sensor to monitor human peripheral microvascular perfusion in real-time
… Human microvasculature includes the arterioles, capillaries, and venules that supply tissues with nutrients, circulate humoral products, and remove waste. The process of circulatory distribution is an efficient and highly structured process that distributes output through a regulation …
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Retinal Ischemia in the In Vivo Rodent: Cellular and Vascular Characteristics
… difficult to evoke in areas away from primary arterioles, suggesting that capillary regulation of functional hyperemia is unlikely. To determine the role of glial Ca2+ signaling on neurovascular coupling, we developed a method of injecting Ca2+ indicator dyes and caged Ca2+ compounds into the …
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Role of Activated Macrophages and Pro-Inflammatory Cytokines in Placental Trophoblast Invasion and Fetal Outcome
… trophoblast cells transform the uterine spiral arterioles into high-flow, low-resistance vessels that supply the placenta to support fetal growth and development. Inadequate trophoblast invasion and spiral arteriole remodelling may result in excessive placental pathology leading to pre-eclampsia …
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