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The ocular circulation
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ISBN: 1615041699 1615041680 Year: 2011 Publisher: [San Rafael, Calif.?] : Morgan & Claypool,

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Abstract

This presentation describes the unique anatomy and physiology of the vascular beds that serve the eye. The needs for an unobstructed light path from the cornea to the retina and a relatively fixed corneal curvature and distance between refractive structures pose significant challenges for the vasculature to provide nutrients and remove metabolic waste.To meet these needs, the ocular vascular beds are confined to the periphery of the posterior two thirds of the eye and a surrogate circulation provides a continuous flow of aqueous humor to nourish the avascular cornea, lens and vitreous compartment. The production of aqueous humor (and its ease of egress from the eye) also generates the intraocular pressure (IOP), which maintains the shape of the eye. However, the IOP also exerts a compressing force on the ocular blood vessels that is higher than elsewhere in the body. This is particularly true for the intraocular veins, which must have a pressure higher than IOP to remain patent, and so the IOP is the effective venous pressure for the intraocular vascular beds. Consequently, the ocular circulation operates at a lower perfusion pressure gradient than elsewhere in the body and is more at risk for ischemic damage when faced with low arterial pressure, particularly if IOP is elevated. This risk and the specialized tissues of the eye give rise to the fascinating physiology of the ocular circulations.


Book
Signal Transduction and Smooth Muscle.
Authors: ---
ISBN: 1498774237 1351650610 1315154587 1498774229 9781351650618 Year: 2018 Publisher: Milton : Chapman and Hall/CRC,

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All hollow organs, such as blood vessels, the gastrointestinal tract, airways, male and female reproductive systems, and the urinary bladder are primarily composed of smooth muscle. Such organs regulate flow, propulsion and mixing of luminal contents and storage by the contraction and relaxation of smooth muscle cells. Smooth muscle cells respond to numerous inputs, including pressure, shear stress, intrinsic and extrinsic innervation, hormones and other circulating molecules, as well as autocrine and paracrine factors. This book is a review of smooth muscle cell regulation in the cardiovascular, reproductive, GI, and other organ systems with emphasis on calcium and receptor signaling.


Book
Advanced Materials and Technologies for Fuel Cells
Authors: --- --- ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Fuel cells are expected to play a relevant role in the transition towards a sustainable-energy-driven world. Although this type of electrochemical system was discovered a long time ago, only in recent years has global energy awareness, together with newly developed materials and available technologies, made such key advances in relation to fuel cell potential and its deployment. It is now unquestionable that fuel cells are recognized, alongside their possibility to work in the reverse mode, as the hub of the new energy deal. Now the questions are, why are they not yet ready to be used, despite the strong economic support given from the society? What prevents them from being entered into the hydrogen energy scenario in which renewable sources will provide energy when it is not readily available? How much are researchers involved in this urgent step towards change? This book gives a clear answer, engaging with some of the open issues that explain the delay of fuel cell deployment and, at the same time, it opens a window that shows how wide and attractive the opportunities offered by this technology are. Papers collected here are not only specialist-oriented but also offer a clear landscape to curious readers and show how challenging the road to the future is.


Book
Advanced Materials and Technologies for Fuel Cells
Authors: --- --- ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Fuel cells are expected to play a relevant role in the transition towards a sustainable-energy-driven world. Although this type of electrochemical system was discovered a long time ago, only in recent years has global energy awareness, together with newly developed materials and available technologies, made such key advances in relation to fuel cell potential and its deployment. It is now unquestionable that fuel cells are recognized, alongside their possibility to work in the reverse mode, as the hub of the new energy deal. Now the questions are, why are they not yet ready to be used, despite the strong economic support given from the society? What prevents them from being entered into the hydrogen energy scenario in which renewable sources will provide energy when it is not readily available? How much are researchers involved in this urgent step towards change? This book gives a clear answer, engaging with some of the open issues that explain the delay of fuel cell deployment and, at the same time, it opens a window that shows how wide and attractive the opportunities offered by this technology are. Papers collected here are not only specialist-oriented but also offer a clear landscape to curious readers and show how challenging the road to the future is.


Book
Advanced Materials and Technologies for Fuel Cells
Authors: --- --- ---
Year: 2021 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Fuel cells are expected to play a relevant role in the transition towards a sustainable-energy-driven world. Although this type of electrochemical system was discovered a long time ago, only in recent years has global energy awareness, together with newly developed materials and available technologies, made such key advances in relation to fuel cell potential and its deployment. It is now unquestionable that fuel cells are recognized, alongside their possibility to work in the reverse mode, as the hub of the new energy deal. Now the questions are, why are they not yet ready to be used, despite the strong economic support given from the society? What prevents them from being entered into the hydrogen energy scenario in which renewable sources will provide energy when it is not readily available? How much are researchers involved in this urgent step towards change? This book gives a clear answer, engaging with some of the open issues that explain the delay of fuel cell deployment and, at the same time, it opens a window that shows how wide and attractive the opportunities offered by this technology are. Papers collected here are not only specialist-oriented but also offer a clear landscape to curious readers and show how challenging the road to the future is.

Keywords

Research & information: general --- Technology: general issues --- polymer electrolyte fuel cell --- cyclic current profile --- transient behavior --- pressure drop --- Ohmic resistance --- solid oxide fuel cells (SOFCs) --- ionic conductivity --- Raman spectroscopy --- powder X-ray diffraction --- microbial fuel cell --- low-cost ceramics --- separator --- membrane --- porosity --- pore size --- water absorption --- mercury intrusion --- raman spectroscopy --- powder x-ray diffraction --- doped ceria --- solid oxides fuel cells --- Sm-doped ceria --- high pressure X-ray powder diffraction --- diamond anvil cell --- equation of state --- Rietveld refinement --- SOFC --- reliability --- contamination --- salt --- oxygen starvation --- concentration polarization --- fuel cell application --- microfluidic fuel cell --- power supply --- soft drinks --- hydrogen production --- alkaline water electrolysis --- two-phases flow --- CFD --- two-phase process --- BSCF --- SOEC --- rSOC --- anodic overpotential --- impedance spectroscopy --- sealants --- glass-ceramic --- joining --- CH4 internal reforming --- solid oxide fuel cell --- 2D local control --- cell design optimization --- active site degradation --- tape casting process --- open circuit voltage --- activation energy --- power density --- IT-SOFC --- PEM fuel cell --- useful water --- hydrogen consumption scenarios --- modified fuel utilization --- polymer electrolyte fuel cell --- cyclic current profile --- transient behavior --- pressure drop --- Ohmic resistance --- solid oxide fuel cells (SOFCs) --- ionic conductivity --- Raman spectroscopy --- powder X-ray diffraction --- microbial fuel cell --- low-cost ceramics --- separator --- membrane --- porosity --- pore size --- water absorption --- mercury intrusion --- raman spectroscopy --- powder x-ray diffraction --- doped ceria --- solid oxides fuel cells --- Sm-doped ceria --- high pressure X-ray powder diffraction --- diamond anvil cell --- equation of state --- Rietveld refinement --- SOFC --- reliability --- contamination --- salt --- oxygen starvation --- concentration polarization --- fuel cell application --- microfluidic fuel cell --- power supply --- soft drinks --- hydrogen production --- alkaline water electrolysis --- two-phases flow --- CFD --- two-phase process --- BSCF --- SOEC --- rSOC --- anodic overpotential --- impedance spectroscopy --- sealants --- glass-ceramic --- joining --- CH4 internal reforming --- solid oxide fuel cell --- 2D local control --- cell design optimization --- active site degradation --- tape casting process --- open circuit voltage --- activation energy --- power density --- IT-SOFC --- PEM fuel cell --- useful water --- hydrogen consumption scenarios --- modified fuel utilization

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