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排序方式: 共有104条查询结果,搜索用时 62 毫秒
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Characterization of bacterial strains able to grow on high molecular mass residues from crude oil processing 总被引:9,自引:0,他引:9
Yuste L Corbella ME Turiégano MJ Karlson U Puyet A Rojo F 《FEMS microbiology ecology》2000,32(1):69-75
Oil residues containing high molecular mass hydrocarbons, rich in polyaromatic compounds, are frequent end-products of crude oil processing and are poorly biodegradable. Their disposal poses an environmental problem. Through batch-enrichments from contaminated soils we have isolated and characterized seven bacterial strains that can use a residue from crude oil processing as a source of carbon and energy. The residue was a complex mixture of high molecular mass compounds, including saturated, aromatic and polycyclic aromatic hydrocarbons (PAHs). Analysis of the metabolic profiles of the strains isolated showed that they could all metabolize long-chain-length alkanes efficiently, but not PAHs. Strains degrading naphthalene, a simple PAH, did exist in the soil inocula used, but could be isolated only when enrichments were performed using pure naphthalene as the sole carbon source. All strains tested emulsified the oil residue and their ability to produce surfactants was studied. 相似文献
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The ability of two strains of Lactobacillus acidophilus, CRL 640 and CRL 800, to survive and retain their biological activities under frozen storage was determined. Freezing and thawing, as well as frozen storage, damaged the cell membrane, rendering the microorganisms sensitive to sodium chloride and bile salts. Both lactic acid production and proteolytic activity were depressed after 21 days at -20 degreesC, whereas beta-galactosidase activity per cell unit was increased. Cell injury was partially overcome after repair in a salt-rich medium. Copyright 1998 Academic Press. 相似文献
4.
Themelis Karaminis Marco Turi Louise Neil Nicholas A. Badcock David Burr Elizabeth Pellicano 《PloS one》2015,10(3)
A recent study showed that adaptation to causal events (collisions) in adults caused subsequent events to be less likely perceived as causal. In this study, we examined if a similar negative adaptation effect for perceptual causality occurs in children, both typically developing and with autism. Previous studies have reported diminished adaptation for face identity, facial configuration and gaze direction in children with autism. To test whether diminished adaptive coding extends beyond high-level social stimuli (such as faces) and could be a general property of autistic perception, we developed a child-friendly paradigm for adaptation of perceptual causality. We compared the performance of 22 children with autism with 22 typically developing children, individually matched on age and ability (IQ scores). We found significant and equally robust adaptation aftereffects for perceptual causality in both groups. There were also no differences between the two groups in their attention, as revealed by reaction times and accuracy in a change-detection task. These findings suggest that adaptation to perceptual causality in autism is largely similar to typical development and, further, that diminished adaptive coding might not be a general characteristic of autism at low levels of the perceptual hierarchy, constraining existing theories of adaptation in autism. 相似文献
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Szabo A Balog M Mark L Montsko G Turi Z Gallyas F Sumegi B Kalai T Hideg K Kovacs K 《Mitochondrion》2011,11(3):476-487
In this paper, we present evidence, for the first time, that increasing the lipophilicity of mitochondria targeting SOD mimetics reverses their cytoprotective properties, destabilizing the mitochondrial membrane system and promoting cell death. A new mitochondria-directed apolar SOD mimetic, HO-3814, was found to provoke mitochondrial swelling and loss of mitochondrial membrane potential, and these effects were not inhibited by cyclosporine A. HO-3814-induced cell death was predominantly necrotic, caspase-independent, and not affected by mitochondrial permeability transition inhibitors or cyclophilin D-suppression, inhibitors of mitogen-activated protein kinases or Akt, or various antioxidants. In contrast, Bcl-2 overexpression diminished the effects of HO-3814. 相似文献
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Marco Fichera Angela Spalletta Flavia Fiorenza Turi Lombardo Gino Schilirò Ryad Tamouza Claudine Lapouméroulie Dominique Labie A. Ragusa 《Human genetics》1997,99(3):381-386
To evaluate the allelic frequency and genetic diversity of α-thalassemia defects in Sicily, both epidemiological and patient-oriented
studies were carried out. For the epidemiological study, phenotypic data were collected on more than 1000 Sicilian individuals.
Among them, 427 were explored at the molecular level for nine α-thalassemic variants known to be common in the Mediterranean
region. Our data reveal an allele frequency of 4.1% for α+-thalassemia matching that of β-thalassemia in this region. The presence of α°-thalassemia (––MEDI and ––CAL) was observed only in the group of referred patients. Newly acquired nucleotide sequence data on the deletional breakpoint
of ––CAL allowed us to design a simple PCR-based procedure for exploring this allele. The data also provide additional information
concerning the genetic mechanisms involved in such large deletions.
Received: 8 August 1996 / Revised: 16 October 1996 相似文献
10.
Jennifer L. Turi Claude A. Piantadosi Jackie D. Stonehuerner Andrew J. Ghio 《Biometals》2008,21(5):571-580
Airway epithelial cells prevent damaging effects of extracellular iron by taking up the metal and sequestering it within intracellular ferritin. Epithelial iron transport is associated with transcellular movement of other cations including changes in the expression or activity of Na, K-ATPase and epithelial Na(+) channel (ENaC). Given this relationship between iron and Na(+), we hypothesized that iron uptake by airway epithelial cells requires concurrent Na(+) transport. In preliminary studies, we found that Na(+)-free buffer blocked iron uptake by human airway epithelial cell. Na(+) channels inhibitors, including furosemide, bumetanide, and ethylisopropyl amiloride (EIPA) significantly decreased epithelial cell concentrations of non-heme iron suggesting that Na(+)-dependent iron accumulation involves generalized Na(+) flux into the cells rather than participation of one or more specific Na(+) channels. In addition, efflux of K(+) was detected during iron uptake, as was the influx of phosphate to balance the inward movement of cations. Together, these data demonstrate that intracellular iron accumulation by airway epithelium requires concurrent Na(+)/K(+)exchange. 相似文献