共查询到20条相似文献,搜索用时 15 毫秒
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Silver uptake, distribution, and effect on calcium, phosphorus, and sulfur uptake 总被引:2,自引:0,他引:2
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Bean, corn, and tomato plants were grown in a nutrient solution labeled with 32P, 45Ca, or 35S and varying concentrations of AgNO3. Following a 6-hour treatment period, plants were harvested and analyzed. A low Ag+ concentration (50 nanomolar) inhibited the shoot uptake of the ions investigated. In the roots, Ca uptake increased whereas P and S uptake decreased. 相似文献
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Thrombomodulin is found on endothelium of arteries, veins, capillaries, and lymphatics, and on syncytiotrophoblast of human placenta 总被引:15,自引:0,他引:15
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We have used antibodies to human thrombomodulin isolated from placenta to investigate the distribution of this cofactor for protein C activation in human tissues. Thrombomodulin was found on endothelial cells of arteries, veins, capillaries, and lymphatics by immunocytochemical staining using an avidin-biotin peroxidase method. Thrombomodulin was not detected on sinusoidal lining cells of liver or on postcapillary high-endothelial venules of lymph node, although the latter contained another endothelial antigen, von Willebrand factor. Other cells noted to contain thrombomodulin antigen are those of the syncytiotrophoblast in placenta. The thrombomodulin in syncytiotrophoblast was primarily on the plasma membrane surface that forms the maternal blood sinus. Syncytiotrophoblast also stained with antibodies to von Willebrand factor, which implies that these cells have multiple endothelial functions. Thrombomodulin antigen was found in all organs studied, with the notable exception of brain. 相似文献
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I. Goldberg J. S. Rock A. Ben-Bassat R. I. Mateles 《Biotechnology and bioengineering》1976,18(12):1657-1668
Several bacteria utilizing C1-compounds as sole carbon sources were grown on these substrates in continuous culture. The molar yield values (g of cell dry wt/mol of substrate utilized) of bacteria which utilize C1-compounds via the ribulose monophosphate pathway were between 15.7 to 17.3 when grown on methanol; while the molar yield values of bacteria which use the serine pathway for the assimilation of C1-compounds varied between 9.8 and 13.1. The molar yield values of different bacteria which use the serine pathway decreased as the oxidation levels of the C1-growth substrates increased. On formaldehyde the values were between 7.2 to 9.6, whereas on formate the values varied from 3.3 to 6.9. It appears that bacteria utilize Cl-compounds more efficiently via the ribulose monophosphate pathway than via the serine pathway. The oxidation step from methanol to formaldehyde (and from methylamine to formaldehyde) in the bacteria studied may be energy yielding. A comparison has been made between the experimental yield values obtained and theoretical values. 相似文献
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WICKBOM T 《Hereditas》1945,31(3-4):241-346
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Pseudomonas aeruginosa is a serious pathogen involved in nosocomial infections. Its pathogenicity is owed to rich production of virulence factors
(VIFs) regulated by several complex hierarchical signal systems depending on environmental conditions, medium composition,
and the presence of certain active compounds in it. Choline (Ch), which exists in patient tissues, and ethanol (Et), whose
consumption aggravates infections, were reported to augment this microbe virulence. The goal of the present study was to show
the effect of Et addition to P. aeruginosa cultures in two media (minimal culture medium [MM] and Eagon-Grelet medium [EGM]) in the absence or presence of Ch on its
VIF levels. In MM, Et sharply repressed the basal and Ch-induced levels of the P. aeruginosa lectins PA-IL (galactose-specific) and PA-IIL (fucose/mannose-binding) and proteolytic activities, while increasing C6-HSL (autoinducer), hemolytic phospholipase C (PLC-H), and phosphatase levels. In EGM, it profoundly increased lectin, protease,
pyocyanin, rhamnolipid (RhaL), autoinducer, and slightly phosphatase levels, but reduced Ch-induced protease, PLC-H, and acid
phosphatase activities, except the short-chain HSL levels, which were increased by Et in combination with Ch. The presented
results enlighten part of the complex molecular basis of Et-induced aggravation of P. aeruginosa infections due to increasing the bacterium virulence, which runs in parallel to suppression of the patient’s immunity. 相似文献
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Bahiagrass,Corn, Cotton Rotations,and Pesticides for Managing Nematodes,Diseases, and Insects on Peanut 总被引:1,自引:0,他引:1
A. W. Johnson N. A. Minton T. B. Brenneman G. W. Burton A. K. Culbreath G. J. Gascho S. H. Baker 《Journal of nematology》1999,31(2):191-200
Florunner peanut was grown after 1 and 2 years of Tifton 9 bahiagrass, corn, cotton, and continuous peanut as whole-plots. Pesticide treatments aldicarb (3.4 kg a.i./ha), flutolanil (1.7 kg a.i./ha), aldicarb + flutolanil, and untreated (control) were sub-plots. Numbers of Meloidogyne arenaria second-stage juveniles in the soil and root-gall indices of peanut at harvest were consistently lower in plots treated with aldicarb and aldicarb + flutolanil than in flutolanil-treated and untreated plots. Percentages of peanut leaflets damaged by thrips and leafhoppers were consistently greater in flutolaniltreated and untreated plots than in plots treated with aldicarb or aldicarb + flutolanil but not affected by cropping sequences. Incidence of southern stem rot was moderate to high for all chemical treatments except those that included flutolanil. Stem rot loci were low in peanut following 2 years of bahiagrass, intermediate following 2 years of corn or cotton, and highest in continuous peanut. Rhizoctonia limb rot was more severe in the peanut monoculture than in peanut following 2 years of bahiagrass, corn, or cotton. Flutolanil alone or combined with aldicarb suppressed limb rot compared with aldicarb-treated and untreated plots. Peanut pod yields were 4,186 kg/ha from aldicarb + flutolanil-treated plots, 3,627 kg/ha from aldicarb-treated plots, 3,426 kg/ha from flutolanil-treated plots, and 3,056 kg/ha from untreated plots. Yields of peanut following 2 years of bahiagrass, corn, and cotton were 29% to 33% higher than yield of monocultured peanut. 相似文献
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López SR 《Culture, medicine and psychiatry》2003,27(4):419-434
The main goal of this paper is to evaluate the Supplement to the Surgeon General's Report on Mental Health, with an eye toward informing future efforts to prevent and treat mental illness among racial and ethnic minorities. I first briefly discuss the historical background of the Supplement. I then present its strengths, which include the authority and visibility of the Office of the Surgeon General, the organization of the report by racial/ethnic group, the examination of the social and historical context of each of the racial/ethnic groups, and the emphasis on science. Last, I identify three major tensions within the Supplement, focusing on groups versus cultural processes, situating culture within individuals or social worlds, and examining differences between minority groups and whites versus examining conceptually informed processes. The Supplement makes a significant contribution to advancing our understanding of the mental health of racial and ethnic minority groups. The actions that follow (or don't follow), however, will determine the import of this document. 相似文献
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K. O. Muranov N. B. Poliansky V. C. Kurova A. M. Riabokon N. L. Sheremet A. A. Fedorov K. I. Bannik A. N. Abrosimova M. A. Ostrovsky 《Biophysics》2010,55(5):870-877
Four randomized groups of male mice Fl (C57Black/CBA) were investigated: (a) UV-irraidated (UV-A, 15 min daily over 10 months,
51 ± 7 W/m2); (b) γ-ray irradiated (2 Gy), single; (c) influence of combination of UV- and γ-ray treatment; (d) aging. The lens opacities
were measured at the seventh and tenth month. An expert method based on a six-point scale was used for cataract measurement.
At the seventh month, the median of lens opacities were Aging group = 0; UV-irradiated group = 2.5; γ-irradiated group = 4.75;
γ- and UV-irradiated group = 6.0. The difference between all groups was significant (p < 0.004, Kruskall-Wallis ANOVA test). The Conover post hock test has shown a significant difference for all comparison pairs
(p < 0.002) with the exception of the γ- and UV-irradiated group. At the tenth month, the lens opacities strongly increased:
Aging group = 2.5; UV-irradiated group = 5.0; γ-irradiated group = 6.5; γ- and UV-irradiated group = 7.5 (median). The difference
between groups was significant (p < 0.0001, Kruskall-Willis ANOVA test). The Conover post hock test has shown a significant difference for all comparison pairs
(p < 0.003) with the exception of the UV-irradiated group and γ-irradiated group. No formation of specific lens opacities for
any group was found. Morphology and protein composition were investigated at the tenth month. The results of a study of morphological
changes show destructive and degenerative impairments of the capsule, epithelium cages, and lens fibers. However, no specific
changes related to certain particular actions have been found. In addition, there were no specific changes in the protein
composition of either water-soluble and water-insoluble fractions estimated by the differential gel electrophoresis technique.
The data mean that aging, UV treatment, and γ-radiation causes similar lens changes. It was supposed that UV treatment and/or
γ-radiation act as an aging factor on the lens. 相似文献