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Topic: Oxygen Permeability

    Note: these results are not from the primary (high quality) database.

FLUIDS AND FLUID FLOW IN FAULTS AND SHEAR ZONES Dewhurst, D.N., K.M. Brown, M.B. Clennell, and G.K. Westbrook, 1996, A comparison of the fabric and permeability anisotropy of consolidated and sheared silty clay: Engineering Geology, v. Kamineni, D. Kerrich and A. Brown, 1993, Effects of differential reactivity of minerals on the development of brittle to semi-brittle structures in granitic rocks; textural and oxygen isotope evidence, Chemical Geology, v. Babaie, H. Hadizadeh, A. Babaei and A. Ghazi, 1991, Timing and temperature of cataclastic deformation along segments of the Towaliga fault zone, western Georgia, U. A., Journal of Structural Geology, v. www.ees.nmt.edu /Geol/Faults/Faultsflow/FaultBibliography.html

Citations The correlation between active oxygen scavenging and antioxidative effects of flavonoids. Easton AS; Fraser PA. Arachidonic acid increases cerebral microvascular permeability by free radicals in single pial microvessels of the anaesthetized rat. Thioctic acid and dihydrolipoic acid are novel antioxidants which interact with reactive oxygen species. www.asthmaworld.org /Citations.htm   (2540 words)

Diabetes In Control - Biochemical Pathways for Microvascular Complications of Diabetes Mellitus However, some data suggest that the production of reactive oxygen species is increased in the diabetic state and that reactive oxygen species may contribute to increased microvascular permeability and resultant microvascular damage.55,56 Additionally, elevated levels of reactive oxygen species can increase intracellular calcium levels in endothelial tissue culture. Furthermore, increased flux through the sorbitol pathway is associated with above-normal superoxide formation.53 Increased reactive oxygen species may involve the generation of reducing equivalents in the form of unbound cytosolic NADH linked to increased sorbitol pathway activity, thereby providing the source of electrons needed by several enzyme systems to generate superoxide. In regard to diabetes, free radical formation, regardless of the cause, results in damaged protein and mitochondrial DNA that can have deleterious effects on the microvasculature.19,54 Evidence of increased oxidative stress in diabetes is equivocal. www.diabetesincontrol.com /modules.php?name=News&file=print&sid=1952   (2540 words)

Professor David Schiraldi - Macromolecular Science “Structural Model for Oxygen Permeability of a Liquid Crystalline Polymer,” Y. Hu, D. Schiraldi, A. Hiltner, and E. Baer, Macromolecules, 36, 3606-15 (2003). “Oxygen Transport and Free Volume in Cold-Crystallized and Melt-Crystallized Poly(ethylene naphthalate),” Y. Hu, R. Liu, L. Zhang, M. Rogunova, D. Schiraldi, S. Nazarenko, A. Hiltner, and E. Baer, Macromolecules, 35(19), 7326-7337 (2002). “Comparison of Statistical and Blocky Copolymers of Ethylene Terephthalate and Ethylene 4,4’-Bibenzoate Based on Thermal Behavior and Oxygen Transport Properties,” R. Liu, Y. Hu, M. Hibbs, D. Collard, D. Schiraldi, A. Hiltner, E. Baer, J. Polym. polymers.case.edu /people/faculty/schiraldi.htm   (1136 words)

Copolymers and non-porous, semi-permeable membrane thereof and its use for permeating molecules of predetermined molecular weight range - US Patent 5428123 The oxygen permeability was determined for various membranes prepared with the polymers of this invention using a Createch 201 T Permeometer and a Rehder flat polargraphic cell in a 100% humidity chamber at 35°±0.2° C. For each material reading four 13 mm circles of material were stacked together on the electrode. Since the dense membranes of the present invention have permeabilities which are determined by the solubility of the permeants as well as their diffusivity, the permeability coefficients do not vary strictly with molecular weight (size) of the permeants. Crosslinking generally decreases the permeability of a membrane, particularly to large molecules, such as proteins. www.patentstorm.us /patents/5428123.html   (1136 words)

Dairy Foods: Packaging dairy foods - product development for dairy foods For example, color changes during storage of dairy foods are a function of temperature, initial oxygen content, pH, fat content, source of colorant and the nature of the packaging material, in particular its opacity and its permeability to oxygen. If a product developer is aware that a particular package is highly susceptible to dairy case lighting or has a high-oxygen transmission rate, the product's pH can be adjusted or an alternative colorant can be used to minimize color mutations. The same light and oxygen rules apply with other dairy foods including yogurt, cheese, butter and dips. www.findarticles.com /p/articles/mi_m3301/is_n1_v98/ai_19193171   (983 words)

Aroma Films - Aroma Films Aroma, Oxygen and Moisture Barrier Behavior of Coated and Vacuum - Aroma, Oxygen and Moisture Barrier Behavior of Coated and Vacuum Coated OPP Films for Packaging Eldridge M. Mount, III Mobil Chemical Co. 100B-8 Simultaneous measuring permeability of aroma compound - Simultaneous measuring permeability of aroma compound mixtures through polymer packaging films... -...composition with an olefin containing polymer are suitable for use as barrier films, such as aroma barrier films, which have reduced curl. www.lovelyperfume.com /aroma-films.html   (1002 words)

Publications by Polymer Processing Institute's Staff "Processing/Structure Relationships of Mica-Filled Polyethylene Films with Low Oxygen Permeability" M. Xanthos, N. Faridi and Y. Li, Intern. "Processing/Structure Relationships of Mica-Filled Polyethylene Films with Low Oxygen Permeability", M. Xanthos, N. Faridi and Y. Li, Intern. "Effects of Long Infrared Radiation Absorbers on the Properties of Polyethylene Based Agricultural Films", M. Bakar, A. Kioul, U. Yilmazer, P. Hadjiandreou, SPE ANTEC, 1464, (1988). www.polymers-ppi.org /publications   (1002 words)

Human Mitochondrial Thioredoxin. INVOLVEMENT IN MITOCHONDRIAL MEMBRANE POTENTIAL AND CELL DEATH -- Damdimopoulos et al. 277 (36): 33249 -- Journal of Biological Chemistry The abbreviations used are: Trx, thioredoxin; PTP, permeability transition pore; MPT, membrane permeability transition; EST, expressed sequence tag; EGFP, enhanced green fluorescent protein; AMS, 4-acetoamido-4'-maleimidylstilbene-2,2'-disulfonic acid; DTT, dithiothreitol; TTFA, thenoyltrifluoroacetone; ROS, reactive oxygen species. permeability transition (MPT) and subsequent loss of the mitochondrial One possible explanation of the above results could be the induction of MPT. www.jbc.org /cgi/content/full/277/36/33249   (1002 words)

Pottery Portal @ DirtyArt.com A liquid clay body slip is poured into plaster moulds, the permeability of the mould drawing water from the slip to leave a layer the clay body of the internal shape of the mould. Some clays and glazes are oxygen-sensitive, most notably those containing iron and copper, and will change colour depending on the presence of oxygen during the firing. Kilns can either be "oxidized" by opening a port to allow oxygen into the interior or "reduced" by closing off the kiln from outside air to attain colors as desired. dirtyart.com   (4007 words)

Holography Forum (Interesting note: the difference between Silver Bromide and Silver Bromate is just three atoms of oxygen per molecule...thus a really great silver halide hologram can go to hell real fast with too much oxygen, making the Bromide into Bromate). The water pre-swells emulsion changing the spatial frequency on reconstruction SD Alcohol dissolves film dyes making some areas less photosensitive Methylparaben is a preservative which lowers molecular permeability gum is a light scatterer triethanolamine pre-develops image (brown) and holds film swollen fumaric and boric acid whittle away silver particles at edges of grains. The ingredients say: Water, Glycerin, SD Alcohol 40, Sodium Calcium Alginate, Oleyl Sarcosine, Methylparaben, Guar Gum, Triethanolamine, Calcium Sulfate, Fragrance, Calcium Chloride, Fumaric Acid and Boric Acid. www.dragonseye.com /holography/net54holoarchive/1043462743.htm   (4007 words)

"Information resources on elephants"             Descriptors: blood cells, red blood cells, cell shape, water permeability, Elephas. Oxygen radical production by Asian elephant (Elephas maximus) heterophils and Holstein cattle (Bos taurus) neutrophils. Comparative cell shape and diffusional water permeability of red blood cells from Indian elephant (Elephas maximus) and man (Homo sapiens). www.nal.usda.gov /awic/pubs/elephants/asblood.htm   (4007 words)

Vapor Barrier Films In the simplest laminated structure using aluminum foil as the water vapor barrier, an outer layer of oriented polypropylene or nylon protects the fragile metal layer from being easily stretched or broken and further serves to decrease permeability to oxygen, nitrogen, and carbon dioxide. Transmission characteristics for atmospheric gases such as oxygen, nitrogen, or carbon dioxide are harder to find in the manufacturers' data sheets for most of these films, since the films are primarily considered water vapor barriers for storage of sensitive equipment. Vapor barrier films come in a range of types for various specific applications and, on the whole, are easily available, inexpensive, usually heat sealable, and extremely efficient. palimpsest.stanford.edu /waac/wn/wn14/wn14-2/wn14-204.html   (3466 words)

Post-Trauma Vision Syndrome: Part III The molecular mechanism is a breakdown of the intimate association between cerebral blood flow (CBF) and cerebral glucose metabolism (CMGL) causing ischemia (a deficient blood supply) and hypoxia (deficient oxygen supply), which results in metabolic imbalances that change neuronal cell membrane (neurolemma) permeability. Changes in cell membrane permeability immediately result in a cascade of cellular changes that lead to cell toxicity. It is this degenerative neuro-biochemical cascade that results in a delayed and progressive loss of injured-neuron function and is classified as secondary injury. www.neuroskills.com /tbi/vision3.shtml   (1189 words)

Curiculum Vitae Oxygen Permeability was measured at different temperatures with varying oxygen flow through it and can be utilized for the purpose of gas sensors. Among the orders that I personally handled are dealing with the transaction with NBRI (National Botanical Research Institute), Lucknow, India. The prepared powder was sintered at different temperatures to study the densification behaviors. www.geocities.com /kuldeepdudeja   (1037 words)

Estimation of Human Corneal Oxygen Consumption by Noninvasive Measurement of Tear Oxygen Tension While Wearing Hydrogel Lenses -- Bonanno et al. 43 (2): 371 -- Investigative Ophthalmology & Visual Science Huth, SW, Lannom, CS, Lannom, S. (1984) Effect in in vivo and in vitro surface protein deposits on the oxygen permeability of polyhydroxyethylmethacrylate gel contact lenses Am J Optom Physiol Opt 61,232-238 For the thick hydrogel lens (C), the first six data points were averaged to obtain the closed-eye P a subject who was wearing a thin hydrogel dye-coated lens. www.iovs.org /cgi/content/full/43/2/371   (3182 words)

CRPG - Publications 2002 Aléon J, Chaussidon M, Marty B, Lothar-Schutz L, Jaenicke R (2002) Oxygen isotopes in single micrometer-sized quartz grains: tracing the source of Saharan dust over long distance atmospheric transport. Audigane P, Royer J J, Kaieda H (2002) Permeability characterization of the HDR Soultz and Ogachi large-scale reservoir using induced microseismicity. Gurenko A A, Chaussidon M (2002) Oxygen isotope variations in primitive tholeiites of Iceland: evidence from a SIMS study of glass inclusions, olivine phenocrysts and pillow rim glasses. www.crpg.cnrs-nancy.fr /Publications/2002.html   (3182 words)

IANTD Flexible Dive Tables Use the surface interval credit table to determine residual % CNS for surface intervals of :30, :60, :90, and 2 to 6 hours.Also included is a table to determine PO2's at depths of 10 fsw to 220 fsw in 10 fsw increments for Air, Nitrox and Oxygen. These tables are for 28/25% Trimix (28% Oxygen with 25% Helium or greater) as both bottom gas and as the deco gas. These tables are all based on the Varying Permeability Model B (VPM-B) algorithm and incorporate deep stops. www.diveriteexpress.com /logowear/divetables.shtml   (1632 words)

Pulmonary Vascular Permeability and Ischemic Injury in Gelsolin-Deficient Mice -- Becker et al. 28 (4): 478 -- American Journal of Respiratory Cell and Molecular Biology Oxygen-independent upregulation of vascular endothelial growth factor and vascular barrier dysfunction during ventilated pulmonary ischemia in isolated ferret lungs. Effects of oxygen tension and glucose concentration on ischemic injury in ventilated ferret lungs. Separate effects of ischemia and reperfusion on vascular permeability in ventilated ferret lungs. ajrcmb.atsjournals.org /cgi/content/full/28/4/478   (4124 words)

Effect of Free Volume Distribution on Transport and Dissolution Properties of Polymers However, differences in the distribution of these free volume elements accessible to various probes such as oxygen gas and the ortho-positronium complex from PALS are consistent with both PALS results and oxygen solubility differences. While fractional free volume is often correlated with diffusion and permeability properties of polymers, the distribution of this free volume is rarely used as it is more difficult to measure even with techniques such as Positron Annihilation Lifetime Spectroscopy (PALS). This change in free volume distribution is what is responsible for the unique anomalous dissolution behavior observed in poly(nobornene) when it is developed as a photoresist polymer in photolithography applications. aiche.confex.com /aiche/2005/preliminaryprogram/abstract_32719.htm   (4124 words)

Capillary filtration coefficient is independent of number of perfused capillaries in cat skeletal muscle -- Bentzer et al. 280 (6): 2697 -- AJP - Heart and Circulatory Physiology Augmented tissue oxygen supply during striated muscle contraction in the hamster. In: Capillary Permeability: The Transfer of Molecules and Ions Between Capillary Blood and Tissue. Influence of oxygen on perfused capillary density and capillary red cell velocity in rabbit skeletal muscle. ajpheart.physiology.org /cgi/content/full/280/6/H2697   (4124 words)

Pottery @ DirtyArt.com (Dirty Art) A liquid clay body slip is poured into plaster moulds, the permeability of the mould drawing water from the slip to leave a layer the clay body of the internal shape of the mould. Some clays and glazes are oxygen-sensitive, most notably those containing iron and copper, and will change colour depending on the presence of oxygen during the firing. The process of pressuring the clay into a rotational symmetry, so that it does not move from side to side as the wheel head rotates is referred to as "centering" the clay—usually the most difficult skill to master for beginning potters. dirtyart.com   (4103 words)

water-wise gardening The anerobic microorganisms living in the lower waters of a marsh without oxygen convert nitrate to nitrogen gas that is safely returned to the atmosphere. Humus also increases water permeability and water retention, contributing to better plant health and more efficient use of soil moisture. In a school or community garden using public sources of greywater, there should not be direct contact with the greywater. www.jerusalemcityfarmers.org /waterwisegardening.html   (2031 words)

Bromelain Bromelain has been shown to dissolve arteriosclerotic plaque in rabbit aorta in vivo and in vitro.2 It is likely that bromelain also increases vessel wall permeability to oxygen and nutrients while increasing blood fluidity, both of which aid in these conditions. Bromelain and papain, due to their use as a meat tenderizer and to clarify beer, are considered as potential ingestive allergens and may represent an unrecognized cause of an allergic reaction following a meal. In an extensive study of the effect of bromelain on the gastric mucosa, it was found that bromelain increased the uptake of radioactive sulfur by 50% and glucosamine by 30 -90%. www.thorne.com /altmedrev/fulltext/bromelain1-4.html   (5327 words)

2 During the cruise we decided to refrain from the stations planned in the coarsest sands in the south, because the change for successful deployment of the oxygen profiler would be minimal there. The original plan was to investigate stations with increasing grain size and permeability, starting at the muddy Friesian Front and ending in the Broad Fourteens where sand dunes dominate bed form. Furthermore, malfunctioning of both lander systems forced us to stay longer at station 5 than planned. www.nioz.nl /public/dmg/rpt/crs/64pe185.htm   (5327 words)

Plastic wrap - Wikipedia, the free encyclopedia PVC is still used because of its permeability to water vapor and oxygen, which makes it suitable for preserving meat. To use plastic wrap effectively for sealing containers, tear off a section and touch one side of the wrap to one side of the container near the opening, allowing the wrap to cling there and make as smooth a seal as possible. Plastic wrap was first made from PVC, which remains the most common material, but non-PVC alternatives are now being sold because of concerns about the transfer of plasticizers from PVC into food. en.wikipedia.org /wiki/Plastic_wrap   (683 words)

Geological Engineering (G E) Course Descriptions Physical concepts involved in the flow of fluids in porous media; treatment of Darcy's law in a mathematical sense; the concept of relative permeability applied also in a mathematical sense. Economic factors of life forms in each zone of ocean; controlling chemical aspects of water depths, temperatures, salinities, oxygen content in the ecological system. Engineering properties of rock; rock testing techniques; in situ methods; mathematical approach to stress-strain analysis; discontinuities in rock; application for underground openings; rock slopes; foundations and drilling. www.ou.edu /bulletins/courses/geol_engr_courses.htm   (880 words)

Energy and Geoscience Institute Instructional Services Catalog Isotopic Stratigraphy of the Siwalik group 202 5.1 Summary 202 5.2 Stable Carbon and oxygen isotopes in Siwalik Paleosols 202 5.3 Methods 203 5.4 Isotopic Results and Ages of the Kirthar Siwalik sections 204 6. Samples were examined for: Petrography; Biostratigraphy and faunal analysis; Isotopic chemostratigraphy of samples from the Siwalik Group; Organic geochemistry to evaluate source potential, maturity, and oil geochemistry; and Porosity and permeability. Lateral variations within the Siwalik group 209 6.1 Objectives of study 209 6.2 Stratigraphic terminology 209 6.3 Correlation of the Panir, Mushkaf, Kot and Bannh sections 213 6.4 Conclusions 218 7. associates.egi.utah.edu /Database/ReportReview.cfm?Record=51   (880 words)

Rate of NO scavenging alters effects of recombinant hemoglobin solutions on pulmonary vasoreactivity -- Resta et al. 93 (4): 1327 -- Journal of Applied Physiology Many hemoglobin-based oxygen carriers (HBOCs) produce systemic and pulmonary hypertension and may increase microvascular permeability NO scavenging capacity of rHb1.1, we found that, whereas rHb1.1 and low (rHb2.0) rates of NO scavenging on vasoconstrictor reactivity jap.physiology.org /cgi/content/full/93/4/1327   (5185 words)

Botany online: Membranes and Transport - Osmosis When disregarding mediated transport (transport occurring through the action of specific carrier molecules) is the permeability of the membrane dependent on its pore size. Biological membranes are usually permeable for water and gases like oxygen, nitrogen, carbon dioxide and others and semi-permeable for some ions, sugar and other small molecules. The size of the pores is large enough to let small particles (ions, molecules) pass freely though small enough to inhibit the passage of larger molecules. www.biologie.uni-hamburg.de /b-online/e22/22c.htm   (5185 words)

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