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101.
102.
Cell culture testing with material extracts was applied to toxicity screening of some commercial degradable plastics: a plasticized
cellulose acetate, an aliphatic polyester (Bionolle), polyhydroxybutyrate-co-hydroxyvalerate (Biopol), and polycaprolactone
(TONE polymer). Cell culture medium with serum was used as extraction medium. Methods for the determination of morphology
and viability of cells cultured in the extract were investigated. Phase-contrast light microscopy of cells, enhanced by neutral
red staining, provides high-contrast images for qualitative evaluation of cell morphology and lysis. Compared to the determination
of protein using the Bradford method and of neutral red uptake, the determination of dehydrogenase activity using 3-[4,5-dimethylthia-zol-2-yl]-2,5-diephenyl-tetrazolium
bromide (MTT) is more sensitive and accurate. The relative MTT activity of cells cultured in fresh extracts indicate that
TONE polymer (all shapes) and Bionolle (test bars and films) are comparable to materials currently used in the food industry
(polyethylene terephthalate, atactic and isotactic polystyrene) with no toxic effects on cells. 相似文献
103.
In this article, the NO3 radical-initiated atmospheric oxidation degradation of DDT was theoretically investigated using molecular orbital theory calculations. All the calculations of intermediates, transition states and products were performed at the MPWB1K/6-311+G(3df,2p)//MPWB1K/6-31+G(d,p) level of theory. Several energetically favorable reaction pathways were revealed. The formation mechanisms of secondary pollutants were presented and discussed. The rate constants were deduced over the temperature range of 273–333 K using canonical variational transition-state(CVT) theory with the small curvature tunneling(SCT) method. Our study shows that H abstraction from the alkyl group and NO3 addition to the C3 atom of the benzene ring are the dominant reaction pathways. The rate-temperature formula of the overall rate constants is k(T)(DDT+NO3) =(7.21 × 10.15)exp(–153.81/T) cm3/(mol·sec) over the possible atmospheric temperature range of 273–333 K. The atmospheric lifetime of DDT determined by NO3 radical is about 52.5 days, which indicates that it can be degraded in the gas phase within several months. 相似文献
104.
105.
吸水性聚合物用于三次采油的机理是依靠这种聚合物在高含水层孔道表面产生的吸附机理与在孔道中形成的动力捕集和物理堵塞作用,在水的浸泡下,吸水性聚合物形成凝胶膨胀体,对大孔道实行封堵,起到调整吸水剖面,提高驱油效率的目的。以丙烯酸(AA)、丙烯酰胺(AM)为原料合成高吸水性聚合物凝胶,研究合成条件对聚合物凝胶吸水性能的影响,确定最佳合成条件为:当丙烯酸含量达到总量的80%左右,交联剂用量占单体总固含量的0.4%、引发剂用量占单体总固含量的0.4%、pH为5~11。实验结果表明:该聚合物凝胶适用于高含水油田调剖堵水,且可以重复使用,对储层无伤害。 相似文献
106.
Anh BT Kim DD Tua TV Kien NT Anh do T 《Journal of environmental biology / Academy of Environmental Biology, India》2011,32(2):257-262
This study was focused on determining Arsenic (As), Lead (Pb), Cadmium (Cd) and Zinc (Zn) in 33 indigenous plants and 12 soil in-situ plant samples in Thai Nguyen Province, Vietnam. The results showed that the soils of surveyed mining areas contained 181.2- 6754.3 mg kg(-1) As, 235.5-4337.2 mg kg(-1) Pb, 0.8- 419 mg kg(-1) Cd and 361.8-17565.1 mg kg(-1) Zn depending on the characteristics of each mining site. These values are much higher than those typical for normal soil. The heavy metal uptake into shoots and roots of 33 indigenous plant species was also determined. Two species of the plants investigated, Pteris vittata L. and Pityrogramma calomelanos L. were As hyperaccumulators, containing more than 0.1% heavy metals in their shoots. Eleusine indica L., Cynodon dactylon L., Cyperus rotundus L. and Equisetum ramosissimum (Vauch) accumulate very high Pb (0.15-0.65%) and Zn (0.22-1.56%) concentration in their roots. Additional experiments to clarify the potential of six these plants as good candidates for phytoremediation of heavy metal pollution soil are being carried out in our laboratory. 相似文献
107.
Giuliani S Romano S Turetta C Cu NH Bellucci LG Capodaglio G Mugnai C Nhon DH Frignani M 《Journal of environmental monitoring : JEM》2011,13(5):1383-1392
Trace element concentrations have been measured in soil and sediment samples taken from the Thua Thien Hue (TT-H) Province and the Tam Giang-Cau Hai (TG-CH) Lagoon in 2002 and 2004. Results show that the lagoon is only slightly contaminated by elements such as Ag, Cd, Cr, Cu, Ni, Pb and Zn, whereas As, probably naturally enriched in this Asian region, reaches values above the lowest internationally accepted sediment quality guidelines. Concentrations in soils are ascribable to natural sources and distributions in the TG-CH Lagoon are mainly influenced by river inputs, with Ag and Cd undergoing estuarine desorption processes. However, concentration-depth profiles of most trace elements in sediments show a recent increasing trend that might be linked to the economic development of the area. The comparison of porosity and (210)Pb depth profiles (confirmed also by Cd and As) from repeated samplings of the same core locations in the TG-CH Lagoon seems to account for a loss of 5-10 cm of surficial sediment that took place during the time interval between the two samplings. It is hypothesized that extreme meteorological events (e.g. a major typhoon that hit the area in November 2003) could be responsible for such sediment displacement. 相似文献
108.
Da Le Nhu Hoang Anh Quoc Hoang Thi Thu Ha Nguyen Thi Anh Huong Duong Thi Thuy Pham Thi Mai Huong Nguyen Tien Dat Hoang Van Chung Phung Thi Xuan Binh Le Huu Tuyen Tran Cao Son Dang Thu Hien Vu Ngoc Tu Nguyen Trong Nghia Le Thi Phuong Quynh 《Environmental science and pollution research international》2021,28(9):10622-10632
Environmental Science and Pollution Research - Antibiotic residues and antimicrobial resistance in surface water are issues of global concern, especially in developing countries. In this study, the... 相似文献
109.
Dang Huyen T. T. Dang Hung V. Tran Tuong Q. 《Environmental science and pollution research international》2021,28(10):12131-12143
Environmental Science and Pollution Research - Nowadays, together with the economic development, public health activities have gained substantial attention with increasing number of hospitals... 相似文献
110.
Cheng Gong Zhang Yibo Sun Lei Wan Jing Li Zhang Dang Chenyuan Fu Jie 《Environmental science and pollution research international》2021,28(36):49899-49912
Environmental Science and Pollution Research - The microwave electrodeless lamp UV photocatalysis (MWUV) integrated with iron carbon micro-electrolysis (ME) was applied to degrade reactive... 相似文献