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排序方式: 共有164条查询结果,搜索用时 78 毫秒
51.
Duong Hung Cong Nghiem Long Duc Ansari Ashley Joy Vu Thao Dinh Nguyen Khai Manh 《Environmental science and pollution research international》2022,29(28):41941-41952
Environmental Science and Pollution Research - Membrane distillation (MD) has been increasingly explored for treatment of various hyper saline waters, including lithium chloride (LiCl) solutions... 相似文献
52.
Pairing Modern and Paleolimnological Approaches to Evaluate the Nutrient Status of Lakes in Upper Midwest National Parks 下载免费PDF全文
David D. VanderMeulen Brenda Moraska Lafrancois Mark B. Edlund Joy M. Ramstack Hobbs Richard Damstra 《Journal of the American Water Resources Association》2016,52(6):1401-1419
Understanding what constitutes a reference (background) nutrient condition for lakes is important for National Park Service managers responsible for preserving and protecting aquatic resources. For this study we characterize water quality conditions in 29 lakes across four national parks, and compare their nutrient status to U.S. Environmental Protection Agency (USEPA) nutrient reference criteria and alternative criteria recently proposed by others. Where appropriate we also compare the nutrient status of these 29 lakes to state or tribal nutrient reference criteria or standards. For lakes that exceed reference criteria we investigate physical and chemical patterns, and for a subset of lakes compare modern nutrient conditions to paleolimnological (i.e., diatom‐inferred [DI]) nutrient reconstructions. Many lakes exceeded USEPA nutrient reference criteria, but met alternative less restrictive criteria. Modern nutrient conditions were also largely consistent with DI historic (pre‐1900) nutrient conditions. Lakes exceeding alternative nutrient criteria and with elevated nutrient levels relative to DI historic conditions were mostly small, shallow, and dystrophic; continued attention to their nutrient dynamics and biological response is warranted. Coupling modern and paleolimnological data offer an innovative and scientifically defensible approach to understand long‐term nutrient trends and provide greater context for comparison with reference conditions. 相似文献
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54.
In the present study, we investigated morphological changes of hatchlings from asexually and sexually produced eggs of Daphnia galeata and D. similis against fish kairomones. In both species, hatchlings from asexual eggs showed induced traits, such as short body length, long tail spine and high relative tail spine length when influenced by fish kairomones. However, hatchlings from sexual eggs expressed high relative tail spine length regardless of kairomones presence. The results showed that the inducibility of morphological defences depends on the egg type, with inducible defences predominant in asexual eggs while fixed defences are employed by the offspring of sexual eggs in Daphnia. 相似文献
55.
Mitigating Global Warming Potentials of Methane and Nitrous Oxide Gases from Rice Paddies under different irrigation regimes 总被引:3,自引:0,他引:3
A field experiment was conducted in Bangladesh Agricultural University Farm to investigate the mitigating effects of soil amendments such as calcium carbide, calcium silicate, phosphogypsum, and biochar with urea fertilizer on global warming potentials (GWPs) of methane (CH4) and nitrous oxide (N2O) gases during rice cultivation under continuous and intermittent irrigations. Among the amendments phosphogypsum and silicate fertilizer, being potential source of electron acceptors, decreased maximum level of seasonal CH4 flux by 25–27 % and 32–38 % in continuous and intermittent irrigations, respectively. Biochar and calcium carbide amendments, acting as nitrification inhibitors, decreased N2O emissions by 36–40 % and 26–30 % under continuous and intermittent irrigations, respectively. The total GWP of CH4 and N2O gases were decreased by 7–27 % and 6–34 % with calcium carbide, phosphogypsum, and silicate fertilizer amendments under continuous and intermittent irrigations, respectively. However, biochar amendments increased overall GWP of CH4 and N2O gases. 相似文献
56.
地下水铀污染的原位微生物还原与固定:在美国能源部田纳西橡树岭放射物污染现场的试验 总被引:4,自引:0,他引:4
吴唯民 Jack Carley David Watson 顾宝华 Scott Brooks Shelly D. Kelly Kenneth Kemner Joy D. van Nostran 吴力游 许玫英 周集中 罗剑 Erick Cardenas 黃家琪 Matthew W. Fields Terence L. Marsh James M. Tiedje Stefan J. Green Joel E. Kostk Peter K. Kitanidis Philip M. Jardine Craig S. Criddle 《环境科学学报》2011,31(3):449-459
总结了美国斯坦福大学和橡树岭国家实验室等在美国能源部田纳西州橡树岭综合试验基地进行的铀污染原位微生物修复阶段性试验结果.本试验利用微生物以乙醇为电子供体还原地下水和沉积物中的六价铀为不溶解的四价铀,使之原位固定化.随后通过加入溶解氧和硝酸盐来试验微生物还原后的地下水层中还原固定态铀的稳定性.通过预处理和长期间隔注入乙醇... 相似文献
57.
Zhili He Joy D. Van Nostrand Ye Deng Jizhong Zhou 《Frontiers of Environmental Science & Engineering in China》2011,5(1):1-20
Functional gene arrays (FGAs) are a special type of microarrays containing probes for key genes involved in microbial functional
processes, such as biogeochemical cycling of carbon, nitrogen, sulfur, phosphorus, and metals, biodegradation of environmental
contaminants, energy processing, and stress responses. GeoChips are considered as the most comprehensive FGAs. Experimentally
established probe design criteria and a computational pipeline integrating sequence retrieval, probe design and verification,
array construction, data analysis, and automatic update are used to develop the GeoChip technology. GeoChip has been systematically
evaluated and demonstrated to be a powerful tool for rapid, specific, sensitive, and quantitative analysis of microbial communities
in a high-throughput manner. Several generations of GeoChip have been developed and applied to investigate the functional
diversity, composition, structure, function, and dynamics of a variety of microbial communities from different habitats, such
as water, soil, marine, bioreactor, human microbiome, and extreme ecosystems. GeoChip is able to address fundamental questions
related to global change, bioenergy, bioremediation, agricultural operation, land use, human health, environmental restoration,
and ecological theories and to link the microbial community structure to environmental factors and ecosystem functioning. 相似文献
58.
This longitudinal study investigates whether the work environment in mid-career is comparable for men and women MBAs. No gender differences were found in early career. However by mid-career, women report less income, career satisfaction, and boss appreciation than men. Discrimination is also more prevalent for women. 相似文献
59.
Long-term effects of fertilization on the forms and availability of soil phosphorus in rice paddy 总被引:4,自引:0,他引:4
The changes in total P accumulation and P compounds with time in the plough layer in a paddy soil in southern Korea were investigated in relation to the continuous application of chemical fertilizers (NPK), straw based compost (Compost), combination these two (NPK+Compost) for 31 years. Continuous fertilization increased the total and inorganic P contents in plough layers. In NPK, inorganic P fraction did not change with time, but organic P content increased significantly. Long-term application of chemical fertilizer together with compost accelerated the decrease in the organic P fraction, presumably due to promoting microbial activity in the plow layer, and then increased significantly inorganic P fraction. Compost application decreased the residual P and Fe-P fractions and then increased inorganic P fraction, in spite of continuous compost application. Increase in total, inorganic and extractable P with time may be closely related to the increase in the availability of accumulated P for rice growth. 相似文献
60.
Yan R Liang DT Tay JH 《Environmental science and pollution research international》2003,10(6):399-407
GOAL, SCOPE AND BACKGROUND: Mercury (Hg) emission from combustion flue gas is a significant environmental concern due to its toxicity and high volatility. A number of the research efforts have been carried out in the past decade exploiting mercury emission, monitoring and control from combustion flue gases. Most recently, increasing activities are focused on evaluating the behavior of mercury in coal combustion systems and developing novel Hg control technologies. This is partly due to the new regulatory requirement on mercury emissions from coal-fired combustors to be enacted under the U.S. Title III of the 1990 Clean Air Act Amendments. The aim of this review work is to better understand the state-of-the-art technologies of flue gas mercury control and identify the gaps of knowledge hence areas for further opportunities in research and development. MAIN FEATURES: This paper examines mercury behaviors in combustion systems through a comprehensive review of the available literature. About 70 published papers and reports were cited and studied. RESULTS AND DISCUSSION: This paper summarizes the mechanisms of formation of mercury containing compounds during combustion, its speciation and reaction in flue gas, as well as subsequent mobilization in the environment. It also provides a review of the current techniques designed for real-time, continuous emission monitoring (CEM) for mercury. Most importantly, current flue gas mercury control technologies are reviewed while activated carbon adsorption, a technology that offers the greatest potential for the control of gas-phase mercury emissions, is highlighted. CONCLUSIONS AND RECOMMENDATIONS: Although much progress has been achieved in the last decade, techniques developed for the monitoring and control of mercury from combustion flue gases are not yet mature and gaps in knowledge exist for further advancement. More R&D efforts are required for the effective control of Hg emissions and the main focuses are identified. 相似文献