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Side 1 fra 162 resultater
Pulmonary arteriovenous fistulas occluded by percutaneous introduction of coil springs.
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Between July 1980 and July 1983, we occluded 30 pulmonary arteriovenous fistulas (PAVFs) in four patients by percutaneous placement of coil springs. All patients had significant right-to-left shunts and hypoxemia. One presented with recurrent cerebral abscesses following bilateral thoracotomy and
Hydrogen sulfide toxicity in a thermal spring: a fatal outcome.
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BACKGROUND
Hydrogen sulfide (H(2)S) is a toxic gas with the smells of "rotten egg"; its toxic effects are due to the blocking of cellular respiratory enzymes leading to cell anoxia and cell damage.
METHODS
We report two cases with acute H(2)S intoxication caused by inhalation of H(2)S evaporated
Two new steroidal saponins from Selaginella uncinata (Desv.) Spring and their protective effect against anoxia.
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Four steroidal saponins were isolated from the anti-anoxic fraction of the 60% EtOH extract of Selaginella uncinata, including two new compounds, (3β, 7β, 12β, 25R)-spirost-5-ene-3, 7, 12-triol-3-O-α-L-rhamnopyranosyl-(1→2)-O-[α-L-rhamnopyranosyl-(1→4)]-O-β-D-glucopyranoside (1), (2α, 3β, 12β,
Diatoms dominate the eukaryotic metatranscriptome during spring in coastal 'dead zone' sediments.
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An important characteristic of marine sediments is the oxygen concentration that affects many central metabolic processes. There has been a widespread increase in hypoxia in coastal systems (referred to as 'dead zones') mainly caused by eutrophication. Hence, it is central to understand the
Metabolic versatility in a modern lineage of cyanobacteria from terrestrial hot springs.
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The extent of oxygenated environments on the early Earth was much lower than today, and cyanobacteria were critical players in Earth's shift from widespread anoxia to oxygenated surface environments. Extant cyanobacteria that aggregate into cones, tufts and ridges are used to understand the long
Evolution in extreme environments: replicated phenotypic differentiation in livebearing fish inhabiting sulfidic springs.
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We investigated replicated ecological speciation in the livebearing fish Poecilia mexicana and P. sulphuraria (Poeciliidae), which inhabit freshwater habitats and have also colonized multiple sulfidic springs in southern Mexico. These springs exhibit extreme hypoxia and high concentrations of
Synergistic improvement in spring maize yield and quality with micro/nanobubbles water oxygation.
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Soil oxygen shortages in root areas have negative effects on crop growth and decrease crops yield and quality, and soil hypoxia conditions will be aggravated by application of subsurface drip irrigation (SDI). A two-year field experiment was conducted to evaluate the response of maize to
Detecting spring after a long winter: coma or slow vigilance in cold, hypoxic turtles?
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Many freshwater turtle species can spend the winter submerged in ice-covered lakes by lowering their metabolism, and it has been proposed that such severe metabolic depression render these turtles comatose. This raises the question of how they can detect the arrival of spring and respond in a
Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure.
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Two annual Baltic Sea phytoplankton blooms occur in spring and summer. The bloom intensity is determined by nutrient concentrations in the water, while the period depends on weather conditions. During the course of the bloom, dead cells sink to the sediment where their degradation consumes oxygen to
Spring nitrate flux in the Mississippi River Basin: a landscape model with conservation applications.
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Nitrogen derived from fertilizer runoff in the Mississippi River Basin (MRB) is acknowledged as a primary cause of hypoxia in the Gulf of Mexico. To identify the location and magnitude of nitrate runoff hotspots, and thus determine where increased conservation efforts may best improve water quality,
Hydrogen sulfide can inhibit and enhance oxygenic photosynthesis in a cyanobacterium from sulfidic springs.
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We used microsensors to investigate the combinatory effect of hydrogen sulfide (H2 S) and light on oxygenic photosynthesis in biofilms formed by a cyanobacterium from sulfidic springs. We found that photosynthesis was both positively and negatively affected by H2 S: (i) H2 S accelerated the recovery
Local adaptation to soil hypoxia determines the structure of an arbuscular mycorrhizal fungal community in roots from natural CO₂ springs.
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The processes responsible for producing and maintaining the diversity of natural arbuscular mycorrhizal (AM) fungal communities remain largely unknown. We used natural CO(2) springs (mofettes), which create hypoxic soil environments, to determine whether a long-term, directional, abiotic selection
Effect of neap-spring hydrodynamics on salt and suspended sediment transport in multi-branched urban estuaries.
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Unique neap and spring tide hydrodynamic features were studied in the estuarine areas of multi-branched urban rivers in Tokyo, Japan. Intensive measurements of salinity, turbidity, dissolved oxygen, velocity, particulate organic matter (POM), and nutrients were conducted for 13h in five stations
Ethanol synthesis and aerobic respiration in the laboratory by leader segments of Douglas-fir seedlings from winter and spring.
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Stem segments from terminal leaders of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, seedlings were sampled in mid-December when cambial cells were dormant. The residual, debudded leaders were resampled again in early May when the cambium was metabolically active. May stems had higher
"Candidatus Thermonerobacter thiotrophicus," A Non-phototrophic Member of the Bacteroidetes/Chlorobi With Dissimilatory Sulfur Metabolism in Hot Spring Mat Communities.
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In this study we present evidence for a novel, thermophilic bacterium with dissimilatory sulfur metabolism, tentatively named "Candidatus Thermonerobacter thiotrophicus," which is affiliated with the Bacteroides/Ignavibacteria/Chlorobi and which we predict to be a sulfate
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