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51.
Hybertson Brooks M.; Bursten Stuart L.; Leff Jonathan A.; Lee Young M.; Jepson Eric K.; Dewitt Chris R.; Zagorski John; Cho Hyun G.; Repine John E. 《Journal of applied physiology》1997,82(1):226-232
Hybertson, Brooks M., Stuart L. Bursten, Jonathan A. Leff,Young M. Lee, Eric K. Jepson, Chris R. Dewitt, John Zagorski, Hyun G. Cho, and John E. Repine. Lisofylline prevents leak, but not neutrophil accumulation, in lungs of rats given IL-1intratracheally. J. Appl. Physiol.82(1): 226-232, 1997.Interleukin-1 (IL-1) is increased in lunglavages from patients with the acute respiratory distress syndrome, andadministering IL-1 intratracheally causes neutrophil accumulation and aneutrophil-dependent oxidative leak in lungs of rats. In the presentstudy, we found that rats pretreated intraperitoneally with lisofylline[(R)-1-(5-hydroxyhexyl)-3,7-dimethylxanthine (LSF)], an inhibitor of lysophosphatidic acid acyl transferase, which reduces the production of unsaturated phosphatidic acid species,did not develop the lung leak or the related ultrastructural abnormalities that occur after intratracheal administration of IL-1.However, rats pretreated with LSF and then given IL-1 intratracheally did develop the same elevations of lung lavage cytokine-induced neutrophil chemoattractant (CINC) levels and the same increased numbersof lung lavage neutrophils as rats given IL-1 intratracheally. Lungs ofrats given IL-1 intratracheally also had increased unsaturated phosphatidic acid and free acyl (linoleate, linolenate) concentrations compared with untreated rats, and these lipid responses were prevented by pretreatment with LSF. Our results reveal that LSF decreases lungleak and lung lipid alterations without decreasing neutrophil accumulation or lung lavage CINC increases in rats given IL-1 intratracheally. 相似文献
52.
Jane C. Schneider Hugly Suzanne Chris R. Somerville 《Plant Molecular Biology Reporter》1995,13(1):11-17
Twenty-one mutants ofArabidopsis thaliana were isolated that developed chlorosis or necrosis upon incubation at low temperature (10°C to 15°C). Crosses among mutants
in different phenotypic classes showed that mutants in three of four classes were found in a small number of loci.
This article is reproduced fromWeeds World, vol. 1. For electronic access toWeeds World, see PMBR 12(4):302–303. 相似文献
53.
Accuracy of predicting protein secondary structure and solvent accessibility from sequence information has been improved significantly by using information contained in multiple sequence alignments as input to a neural 'network system. For the Asilomar meeting, predictions for 13 proteins were generated automatically using the publicly available prediction method PHD. The results confirm the estimate of 72% three-state prediction accuracy. The fairly accurate predictions of secondary structure segments made the tool useful as a starting point for modeling of higher dimensional aspects of protein structure. © 1995 Wiley-Liss, Inc. 相似文献
54.
55.
Peter van der Meijden Chris van der Drift Godfried D. Vogels 《Archives of microbiology》1984,138(4):360-364
The conversion of methanol by cell-free extracts of the acetogenic bacterium Eubacterium limosum was studied. Incubation of mixed cell-free extracts of both E. limosum and Methanobacterium formicicum resulted in methane formation from methanol in the presence of ATP and 2-mercaptoethanesulfonic acid. The separate extracts were not able to perform this reaction. Addition of ferredoxin obtained from Methanosarcina barkeri to the mixed extracts resulted in increased methane formation. The enzyme, responsible for methanol binding in cell-free extract of E. limosum, was inactivated by FAD under N2 and exhibited maximal activity under an atmosphere of H2. This enzyme contains a firmly bound cobalamin which was methylated by methanol in the presence of ATP. It was demethylated in the presence of methylcobalamin: coenzyme M methyltransferase obtained from M. barkeri under concomitant formation of methylated coenzyme M. These properties are similar to those of methanol: 5-hydroxybenzimidazolylcobamide methyltransferase from M. barkeri. It was proposed that methylotrophic acetogens and methylotrophic methanogens use similar enzymes in the first step of methanol conversion.Abbreviations HS-CoM
2-mercaptoethanesulfonic acid
- CH3S-CoM
2-(methylthio)ethanesulfonic acid
- BrES
2-bromoethanesulfonic acid
- TES
N-tris(hydroxymethyl)-methyl-2-aminoethanesulfonic acid
- MT1
methanol: 5-hydroxybenzimidazolylcobamide methyltransferase
- MT2
methylcobalamin
- HS-CoM
methyltransferase
- DMBI
5,6-dimethylbenzimidazole and HBI, 5-hydroxybenzimidazole, are -ligands of corrinoids
- (S-CoM)2
2,2-dithiodiethanesulfonic acid 相似文献
56.
57.
Wayne Chris Hawkes Calvin C. Willhite Kimberly A. Craig Stanley T. Omaye Douglas N. Cox Wai Nang Choy Andrew G. Hendrickx 《Biological trace element research》1992,35(3):281-297
Forty pregnant long-tailed macaques were treated daily for 30 d with 0, 25, 150 or 300 μg selenium as L-selenomethionine/kg
body weight. Erythrocyte and plasma selenium and glutathione peroxidase specific activities, hair and fecal selenium, and
urinary selenium excretion were increased by and were linearly related to L-selenomethionine dose. Hair selenium was most
sensitive to L-selenomethionine dose, with an 84-fold increase in the 300 μg selenium/(kg-d) group relative to controls (r=0.917). Daily urinary selenium excretion (80-fold,r=0.958), plasma selenium (22-fold,r=0.885), erythrocyte selenium (24-fold,r=0.920), and fecal selenium (18-fold,r=0.911) also responded strongly to L-selenomethionine. Erythrocyte and plasma glutathione peroxidase specific activities increased
154% and 69% over controls, respectively. Toxicity was associated with erythrocyte selenium >2.3 μg/mL, plasma selenium >2.8
μg/mL, and hair selenium >27 μg/g. Plasma, erythrocyte, and hair selenium concentrations may be useful for monitoring and
preventing the toxicity of L-selenomethionine administered to humans in cancer chemoprevention trials. 相似文献
58.
Coccidian oöcysts recovered from the faeces of rough earth snakes Virginia striatula (Serpentes: Colubridae) were found to represent two previously unreported eimerians. Oöcysts of Eimeria desotoensis n. sp. were found in 5/32 (16%) of the snakes and were spherical to ellipsoidal, 18.4 × 17.2 (15–21.5 × 15–19.5) μm, with a thin, single-layered wall; their shape-index (length/width) was 1.07 (1.00–1.23). A micropyle and oöcyst residuum were absent; polar granule were present in 33% of the oöcysts. The sporocysts were ovoidal, 11.5 × 7.6 (10.5–13 × 7–8) μm, with a Stieda body; their shape-index was 1.51 (1.30–1.68). The sporocyst residuum was moderate in size and composed of a cluster of granules. Oöcysts of Eimeria hobartsmithi n. sp. were found in 2/32 (6%) of the snakes and were subspherical to ellipsoidal, 18.0 × 15.7 (16–20 × 15–17) μm, with a thin, single-layered wall; their shape-index was 1.15 (1.02–1.32). A micropyle, oöcyst residuum and polar granule were absent. The sporocysts were elongate, 13.2 × 6.3 (12–14.5 × 6–6.5) μm, with a Stieda body; their shape-index was 2.10 (1.88–2.34). A large sporocyst residuum was present in each sporocyst, often obscuring the sporozoites. In addition to the two new species, oöcysts of E. striatula Upton & McAllister, 1990 were observed in 38% of the snakes. 相似文献
59.
Chris C. M. Poirot Gert-Jan W. M. Van Alebeek Jan T. Keltjens Godfried D. Vogels 《Applied microbiology》1991,57(4):976-980
Growth of the methanogenic bacterium Methanoplanus endosymbiosus is dependent on the presence of ruminal fluid. Ruminal fluid could be replaced by the eluate of a rumen-derived anaerobic digester. From the eluate of the digester, a growth-stimulatory component was purified and identified as p-cresol. Authentic p-cresol supported a half-maximal growth rate of the organism at 50 nM concentration. 相似文献
60.
Jan E. M. Souren Chris Schneijdenberg Arie J. Verkleij Roeland van Wijk 《In vitro cellular & developmental biology. Animal》1992,28(3):199-204
Summary A floating collagen matrix culture of neonatal rat heart myocardial cells shows rhythmic contractions which are dependent
on localization of cells, cell density, and collagen concentration. The rhythmic contractions of the collagen matrix can be
registered by a device scanning the optical density at the edge of the gel and have been observed over a temperature range
from 9° to 40° C. The results of the present study underline the usefulness of myocardial cell populated collagen matrixes
for studies on coherent contractions of heart cell cultures. 相似文献