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Showing 1 to 18 of 18 for “"water channels"”.
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Theoretical and Computational Studies of Microscopic Water Channels
Submitted by Rachelle Ramer (rramer2@illinois.edu) on 2012-06-07T16:58:57Z No. of bitstreams: 1 2004_zhu.pdf: 5511107 bytes, checksum: 2398db52d2bf5fa91522877486ac8d3b (MD5)
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Empirical Nanotube Model: Applications to Water Channels and Nano -Oscillators
… is demonstrated through studies of a nanotube water channel and a K+-nanotube complex. It is found in the former case that atomic partial charges on the tube edges greatly contribute to the total interaction energy, while the polarization of the nanotube lowers the electrostatic energy once a …
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Empirical Nanotube Model: Applications to Water Channels and Nano-Oscillators
… is demonstrated through studies of a nanotube water channel and a K+-nanotube complex. It is found in the former case that atomic partial charges on the tube edges greatly contribute to the total interaction energy, while the polarization of the nanotube lowers the electrostatic energy once a …
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Gating of water channels (aquaporins) in plants: effects of osmotic and oxidative stresses and the role of unstirred layers
There is accumulating evidence that water channels (aquaporins; AQPs) play an important role in plant water relations at the levels of cells, tissues, organs, and whole plants. AQPs facilitate the rapid, passive exchange of water across cell membranes. Most of the water permeability of plasma …
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Sediment Supply Effects On thePlio-Pleistocene Stratigraphic Evolution of the Douala Basin, West Africa
… basin is characterized by two low-amplitude deep water channels of late Pleistocene age that exhibit low sinuosity. The vertical stacking and lateral variations along these channels suggest that the initial seafloor topography was a major factor in the development of their current architectural …
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HIV-1 Vpu Oligomerization in Membrane Mimetics
… arrangements both in the presence and absence of water channels. Finally, I utilized NMR techniques to probe the Vpu assembly in SDS, dodecyl phosphocholine, and lipid membrane mimetics, providing a comparison between these three environments, and propose further studies based on the results of …
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Multi-Disciplinary Analyses of Outcropping Late Cretaceous Clinoform Stratigraphy, Magallanes Basin, Chile
… shelf-edge deltas, submarine canyons, and deep-water channels are central components of these systems, yet their stratigraphic architecture, sediment-routing behaviour, fluid trapping potential, and influence on organic matter preservation are commonly studied separately. The consequence is a …
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Water permeability of plant cells measured by pressure probes: effects of light and turgor, and the role of unstirred layers
… unstirred layers (USLs) during measurements of water permeability (hydraulic conductivity) at the level of single cells, during measurements with the cell pressure probe (CPP) and (ii) on the use of the latter technique to investigate changes in water permeability of leaf cells in response to …
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Planimetric and Volumetric Analysis of Channel Change In the Post-Hydraulic Mining Period (1906-2009) In the Central Valley, California
… in natural levees, and net erosion of high-water channels from 1906 or 1909 to 1999. Over the last century, channels incised up to ~13 m into mining sediment deposits. Systematic uncertainty analysis reveals vertical errors are mostly dependent on the topographical slopes and maximum errors …
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Automatic baleen whale detection and 2D localization using a network of unsynchonized passive acoustic sensors
Underwater acoustics is a powerful tool for learning about the ocean’s soniferous marine life. However, most modern acoustic sensing systems consist of expensive arrays of timesynchronized recorders which require a crewed research vessel and significant expertise to deploy, operate, and recover. …
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Identification of growth-related tonoplast proteins in Arabidopsis thaliana
… cell, plays a major role in controlling the water balance of the plant. This is achieved by regulating the osmotic pressure, through import and export of solutes over the vacuolar membrane (the tonoplast) and by controlling the water channels, the aquaporins. Together with the control of cell …
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Microscopic description of gas permeation and delivery pathways in biological macromolecules
… CO2 and NH3 through lipid membranes and membrane channels. In the first part of this dissertation, I illustrated the necessity of pathways in assuring optimal delivery of O2 or NO to the terminal oxidases and cNOR, which are homologous enzymes, under physiological conditions. The conclusions from …
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Automatic Baleen Whale Detection and 2D Localization Using a Network of Unsynchronized Passive Acoustic Sensors
Underwater acoustics is a powerful tool for learning about the ocean's soniferous marine life. However, most modern acoustic sensing systems consist of expensive arrays of time-synchronized recorders which require a crewed research vessel and significant expertise to deploy, operate, and recover. …
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Sodium channel regulatory mechanisms : current fluctuation analysis on frog skin epithelium
… mechanisms of the amiloride-sensitive Na⁺ channels in isolated frog skin epithelium. The epithelium from ventral frog skin is a model tissue which has proved significant in our understanding of the basic principles involved in water and Na⁺ homeostasis. In particular, this project examines …
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The role of the apoplastic transport barriers for radial water and ion uptake in rice (Oryza sativa L.) and corn (Zea mays L.) roots
… and their resistances to the overall radial water flow are additive. However, the hydraulic resistance of the OPR was smaller by a factor of 30 than the overall values of root Lpr. Hence, the endodermis rather than the OPR limits water uptake. It appears that the OPR is constructed to provide …
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Mechanism and energetics of membrane transporters and channels
… proteins called membrane transporters and channels that catalyze exchange of materials across the cell membrane. Membrane trans- porters couple the active transport of their specific substrates against their electrochemical gradient. On the other hand, membrane channels facilitate passive …
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MORPHOLOGICAL FEATURES OF THE REPRODUCTIVE ORGANS IN DOMESTIC SPECIES IN RELATION TO WATER MOVEMENT CONTROL, HYPONUTRITION AND ENVIRONMENTAL INFLUENCES IN FETAL AND PREPUBERTAL LIFE, AND METABOLISM REGULATOR FACTORS.
… more permeable than the membranes lacking such channels. Based on studies with AQP1, it appears that AQPs exist in the plasma membrane as homotetramers. Each AQP monomer contains 2 hemi-pores, which fold together to form a water channel. Different aqps have different patterns of glycosylation. …