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81.
Jun HUANG Yamei HUI Toru MATSUMURA Gang YU Shubo DENG Makoto YAMAUCHI Changmin WU Norimasa YAMAZAKI 《Frontiers of Environmental Science & Engineering》2014,8(2):195-204
Homolog and congener profiles of polychlori- nated biphenyls (PCBs), polychlorinated dibenzo-p- dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in commercial PCBs formulations are useful information for the source appointment of PCBs contam- ination as well as the risk assessment caused by potential exposure. Dielectric oil (ASKAREL Nr 1740) in an imported transformer found in China was sampled and analyzed by isotope dilution technology using high resolution gas chromatography-high resolution mass spectrometry (HRGC/HRMS). The detailed homolog and congener profiles of PCBs obtained were compared with those of known Aroclor formulations. High similarity in the homolog profile between the oil sample and Aroclor 1260was found, with the hexachlorinated and hepta- chlorinated biphenyls accounting for more than 80.2% of the total PCBs concentration. Severn indicator PCBs contribute about 30%, while 12 PCB congeners (i.e., # 153, #143, #168, #180, #149, #165, #138, #170, #190, #187, #174, #181) account for more than 50% of the total PCB concentrations. Total concentration ofPCDDs, PCDFs and dioxin-like PCBs (DL-PCBs) was found to be 740 ng TEQ/g, of which 620 ng TEQ/g came from DL-PCBs. The contribution of PCDDs to the total TEQ was neglectable. The concentration of PCDFs homologs follows the order of OCDF 〉 HxCDFs 〉 HpCDFs 〉 PeCDFs 〉 TeCDFs, which is in consistence with the previous study on Aroclor 1260. Three DL-PCBs congeners (i.e., #118, #156, #157) accounted for 77% of the total concentration of DL-PCBs, also they contribute 72% in the TEQ caused by DL-PCBs. 相似文献
82.
To develop a dependable approach to introduce laboratory selected, pesticide-degrading microorganisms into soil environments for the purpose of in situ bioremediation, we tested the possibility of utilizing plant rhizospheres as the vehicle. We first established the rhizosphere competency of a strain of the soil fungus Trichoderma harzianum, a biocontrol species well studied by plant pathologists to colonize plant rhizosphere in many parts of the world. The strain we chose, T.h.2023 is resistant to many fungicides, and it has been shown to metabolize several pesticides. Second, we found that it readily metabolized pentachlorophenol (PCP), which is quickly and stochiometrically converted to pentachloroanisole (PCA) in liquid culture. Taking advantage of this specific feature, we have developed a sensitive metabolic marker approach that allowed us to monitor for the continuous presence and activity of this fungal strain in the corn rhizosphere soil in situ over time. 相似文献
83.
84.
Toxicities of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) were tested on two strains of c-src deficient B6, 129-Src(tm 1 sor) mice, c-src -/+ and c-src -/- and their matched wild-type littermates c-src +/+ mice along with another c-src +/+ mice, from the same genetic lineage, B6, 129-Fos(tm 1 Pa) mice. The most conspicuous effect of c-src deficiency on the toxicity of TCDD appears to be the reduced hepatotoxicity. TCDD-treated c-src deficient mice show only modest degrees of hepatomegaly and triglycerides accumulation as compared to treated wild-type mice. 相似文献
85.
Kumashiro S Matsukura K Kawaura K Matsumura M Ogihara Y Tokuda M 《Die Naturwissenschaften》2011,98(11):983-987
The maize orange leafhopper Cicadulina bipunctata is distributed widely in tropical and subtropical regions of the Old World and feeds on various Poaceae. The leafhopper is
recognized as an important pest of maize in several countries. Adults as well as nymphs of C. bipunctata induce growth stunting and galls characterized by the severe swelling of leaf veins on many cereal crops including wheat,
rice, and maize, but do not on barley. To clarify the mechanism of growth stunting and gall induction by C. bipunctata, we used six barley chromosome disomic addition lines of wheat (2H–7H) and investigated the effect of barley (cv. Betzes)
chromosome addition on the susceptibility of wheat (cv. Chinese Spring) to feeding by the leafhopper. Feeding by C. bipunctata significantly stunted the growth in 2H, 3H, 4H, and 5H, but did not in 6H and 7H. The degree of gall induction was significantly
weaker and severer in 3H and 5H than in Chinese Spring, respectively. These results suggest that barley genes resistant to
growth stunting and gall induction exist in 6H and 7H, and 3H, respectively. 5H is considered to be useful for future assays
investigating the mechanism of gall induction by this leafhopper because of the high susceptibility to the feeding by C. bipunctata. Significant correlation between the degrees of growth stunting and gall induction was not detected in the six chromosome
addition lines and Chinese spring. This implies that these two symptoms are independent phenomena although both are initiated
by the feeding of C. bipunctata. 相似文献
86.
Ramadan Bimastyaji Surya Rachman Indriyani Ikhlas Nurani Kurniawan Setyo Budi Miftahadi Machmuddin Fitra Matsumoto Toru 《Journal of Material Cycles and Waste Management》2022,24(5):1633-1647
Journal of Material Cycles and Waste Management - Open burning is a waste management practice performed by many people worldwide, especially in developing countries. Lack of detailed data of open... 相似文献
87.
Mori Masanobu Hiratsuka Ikuto Itabashi Hideyuki Nakarai Kenichiro Inui Toru 《Journal of Material Cycles and Waste Management》2022,24(4):1228-1236
Journal of Material Cycles and Waste Management - The radioactive cesium (radio-Cs) released following the Fukushima Daiichi Nuclear Power Plant accident was unevenly distributed in soil, sediment,... 相似文献