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91.
Summary Wide hybridizations between M. arvensis and Brassica amphidiploid species (B. napus and B. juncea) were carried out in order to incorporate desirable traits of M. arvensis into Brassica crops. Crossing barriers between them were present without the use of in vitro techniques. F1 hybrids have been produced through ovary culture, when M. arvensis were used as a female parent. Higher hybrid embryo productivity (3.07 embryos per pollination) was obtained in the cross of M. arvensis x B. napus than in that of M. arvensis x B. juncea (0.79 embryos). The hybridity was confirmed by morphology, cytology, isozyme and Southern analyses. The first backcrossing progenies and open pollinated ones were produced. 相似文献
92.
Greg P. Behrens Doug Orr Robert G. Wetherold Barbara Toole O'Neil 《Water, air, and soil pollution》1996,90(1-2):113-122
The Power Plant Integrated Systems: Chemical Emissions Studies (PISCES) Database sponsored by the Electric Power Research Institute is a powerful tool for evaluating and comparing the level of trace substances in power plant process streams. In this paper, data are presented on the level of several selected trace metals found in a few of the aqueous streams present in power plants. In addition, a brief discussion of other features of the Database is presented. 相似文献
93.
Dzygiel A Masiukiewicz E Rzeszotarska B 《Journal of agricultural and food chemistry》2002,50(6):1383-1388
The products of the acetylation reactions of the common herbicide 5-amino-1H-[1,2,4]triazole were investigated using HPLC, GC-MS, 1H NMR, and FTIR spectroscopy. The conventional annular monoacetylation procedures with acetyl chloride are not regioselective and furnish a mixture of isomers. Traditional diacetylation in neat acetic anhydride under reflux produces a mixture of di-, mono-, and triacetylated derivatives. By using equivalent amounts of acetic anhydride in a dimethylformamide solution, a rapid and selective annular monoacetylation of 5-amino-1H-[1,2,4]triazole was achieved. The monoacetylation proceeds via the formation of the intermediate, 1-acetyl-3-amino-1H-[1,2,4]triazole, which had not been observed previously and which undergoes transformation into the known 1-acetyl-5-amino-1H-[1,2,4]triazole. Neat acetic anhydride at room temperature affords the diacetylated derivative, 1-acetyl-3-(acetylamino)-1H-[1,2,4]triazole both from 5-amino-1H-[1,2,4]triazole itself and from either 1-acetyl-5-amino-1H-[1,2,4]triazole or 5-(acetylamino)-1H-[1,2,4]triazole. The atypical product of the second acetylation, 1-acetyl-5-(acetylamino)-1H-[1,2,4]triazole, has been identified. These results may be useful in the development of effective and selective preparative procedures for the acetylation of 5-amino-1H-[1,2,4]triazole. 相似文献
94.
Kurilich AC Jeffery EH Juvik JA Wallig MA Klein BP 《Journal of agricultural and food chemistry》2002,50(18):5053-5057
Antioxidant capacity of hydrophilic and lipophilic extracts from eight broccoli genotypes was compared using the oxygen radical absorbance capacity (ORAC) assay. Each genotype was analyzed for carotenoid, tocopherol, ascorbic acid, and flavonoid content. Results indicate that the antioxidant capacity of hydrophilic extracts ranged from 65.8 to 121.6 micromol trolox equivalents (TE)/g of tissue, and the capacity of lipophilic extracts ranged from 3.9 to 17.5 micromol TE/g. Ascorbic acid and flavonoid content of the hydrophilic extracts did not explain the total variation in antioxidant capacity of those extracts, suggesting either the presence of other antioxidant components that have yet to be identified or that the known antioxidants are producing synergistic effects. The carotenoids did correlate with antioxidant capacity of the lipophilic extracts and accounted for the majority of the variability in that fraction. The variability in hydrophilic and lipophilic antioxidant capacity found among these genotypes suggests that potential efficacy from antioxidants will vary considerably from genotype to genotype. 相似文献
95.
Schrader Gritta Hauser Barbara Bahadir Müfit Larink Otto 《Water, air, and soil pollution》2001,128(3-4):401-406
Water, Air, &; Soil Pollution - A filter dust of a waste incineration plant provided for underground disposal was elutriated with three different elutriation media possibly be found in... 相似文献
96.
Culliton BJ 《Science (New York, N.Y.)》1983,220(4601):1029
The National Institutes of Health plans to follow up on an Emory University review of John Darsee's research with an investigation of its own. Darsee, caught fabricating data in dog experiments as a Harvard cardiology fellow in 1981, engaged in research on patients while in training at Emory. NIH investigators will try to determine why Darsee's experiments, which allegedly took place at an NIH-funded center, did not come under scrutiny by Emory's institutional review board. 相似文献
97.
98.
Casassus B 《Science (New York, N.Y.)》2003,299(5614):1823-1824
99.
100.
The mammalian intestine harbors a beneficial microbiota numbering approximately 10(12) organisms per gram of colonic content. The host tolerates this tremendous bacterial load while maintaining the ability to efficiently respond to pathogenic organisms. In this study, we show that the Bacteroides use a mammalian-like pathway to decorate numerous surface capsular polysaccharides and glycoproteins with l-fucose, an abundant surface molecule of intestinal epithelial cells, resulting in the coordinated expression of this surface molecule by host and symbiont. A Bacteroides mutant deficient in the ability to cover its surface with L-fucose is defective in colonizing the mammalian intestine under competitive conditions. 相似文献