Abstract:
:Based on limited data for the removal of radioactive (99)Tc by freshwater phytoplankton, it has been thought that phytoplankton are unsuitable for remediation of (99)Tc-contaminated waters. This work sought to verify the validity of this assumption by studying the removal of (99)TcO(4)(-) by freshwater and brackish water phytoplankton. The phytoplankton used were Euglena gracilis, Chlamydomonas pulsatilla, Chlorella vulgaris, and Spirulina platensis. Each of them was incubated for 63 d, and the removal of (99)Tc from solution was periodically determined. Significant removal of (99)Tc was observed only for E. gracilis, and the maximum removal was 70% of the total (99)Tc added. The killed cells of E. gracilis, however, removed hardly any (99)Tc. When E. gracilis cells were washed with fresh culture medium, only 13% of the total (99)Tc was desorbed. These results suggested that intracellular uptake of (99)Tc by E. gracilis occurred. These results are the first documented example of significant removal of (99)Tc by planktonic microalgae.
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Ishii N,Uchida Sdoi
10.2134/jeq2006.0045subject
Has Abstractpub_date
2006-10-27 00:00:00pages
2017-20issue
6eissn
0047-2425issn
1537-2537pii
35/6/2017journal_volume
35pub_type
杂志文章abstract::The aim of the present study is to assess whether certain ecophysiological responses (contents of total phenols, total proanthocyanidins, and total and simple flavonols), in the needles of Aleppo pines (Pinus halepensis Mill.) may be valid bioindicators for the assessment of the air quality. Samples were taken at five...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2003.2265
更新日期:2003-11-01 00:00:00
abstract::Denitrifying bioreactors using woodchips or other slow-release carbon sources can be an effective method for removing nitrate (NO) from wastewater and tile drainage. However, the ability of these systems to remove fecal microbes from wastewater has been largely uninvestigated. In this study, reductions in fecal indica...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2015.06.0326
更新日期:2016-05-01 00:00:00
abstract::Groundwater contamination from NO-N leaching in corn ( L.) production with coarse-textured soils poses an environmental concern. Our objectives were to evaluate NO-N leaching in continuous corn (CC), corn after soybean ( L.) (CSb), and soybean after corn (SbC) in irrigated sandy soils in Minnesota related to (i) N rat...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2016.03.0105
更新日期:2016-09-01 00:00:00
abstract::Ammonia is an important air and water pollutant, but the spatial variation in its concentrations presents technical difficulties in accurate determination of ammonia emissions from animal feeding operations. The objectives of this study were to investigate the relationship between ammonia volatilization and delta15N o...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2009.0057
更新日期:2009-10-29 00:00:00
abstract::Landscape representations based on land cover databases differ significantly from the real landscape. Using a land cover database with high uncertainty as input for emission inventory analyses can cause propagation of systematic and random errors. The objective of this study was to analyze how different land cover rep...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0438
更新日期:2008-05-02 00:00:00
abstract::Accretion of organic matter in wetlands provides long-term storage for nutrients and other contaminants. Water-table fluctuations and resulting alternate flooded and drained conditions may substantially alter the stability of stored materials including phosphorus (P). To study the effects of hydrologic fluctuation on ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.302668x
更新日期:2001-03-01 00:00:00
abstract::This study used manual full cross-sectional flow discrete sampling and suspended sediment concentration (SSC) methods to gravimetrically characterize noncolloidal hetero-disperse particulate matter (PM). This PM was examined as suspended, settleable, and sediment fractions to assess the distinct transport behavior of ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0495
更新日期:2008-08-08 00:00:00
abstract::High grazing pressure can lead to soil erosion in pastures, causing increased sediment delivery to waterways. The objectives of this research were to evaluate the impact of grazing management and buffer strips on soil erosion by assessing soil physical properties, hydrology, and sediment loads from pastures fertilized...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2016.09.0378
更新日期:2017-03-01 00:00:00
abstract::Concentrated animal feeding operations are major sources of ammonia to the atmosphere. Control methods to reduce emissions include acidifying amendments, urease inhibitors, and absorbents. For beef cattle, decreasing crude protein (CP) in diets may be the most practical and cost-effective method to reduce ammonia emis...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2005.0045
更新日期:2006-02-02 00:00:00
abstract::Most states in the USA have adopted P Indexing to guide P-based management of agricultural fields by identifying the relative risk of P loss at farm and watershed scales. To a large extent, this risk is based on hydrologic principles that frequently occurring storms can initiate surface runoff from fields. Once initia...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0381
更新日期:2008-06-23 00:00:00
abstract::Excess NO leaching from the agricultural Midwest via tile drainage water has contributed to both local drinking water and national Gulf of Mexico benthic hypoxia concerns. Both in-field and edge-of-field practices have been designed to help mitigate NO flux to surface waters. Edge-of-field practices focus on maximizin...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2018.03.0125
更新日期:2019-03-01 00:00:00
abstract::Arsenic is highly toxic and therefore represents a potential threat to the environment and human health. The mobility and bioavailability of arsenic in soil is mostly controlled by adsorption and desorption reactions. Even though adsorption and traditional batch desorption experiments provide information about the env...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:
更新日期:2005-03-01 00:00:00
abstract::Acidification of mine wastes can lead to a series of environmental problems, such as acid drainage, heavy metal mobilization, and ecosystem degradation. Prediction of acid-forming potential is one of the key steps in management of sulfide-bearing mine wastes. In this paper, the acid-forming potential of 180 mine waste...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2006.0420
更新日期:2007-05-07 00:00:00
abstract::Sand-sized particles (>63 microm) in whole storm water samples collected from urban runoff have the potential to produce data with substantial bias and/or poor precision both during sample splitting and laboratory analysis. New techniques were evaluated in an effort to overcome some of the limitations associated with ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2006.0147
更新日期:2007-01-09 00:00:00
abstract::Bacterial extracellular polymers (BEP) affect the translocation and fate of organic and inorganic pollutants in terrestrial and aquatic ecosystems. In this study, BEP from activated sludge was compared with sludge dissolved organic matter (DOM) in terms of behavior and effects on the mobilization and bioavailability o...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2004.1540
更新日期:2004-01-01 00:00:00
abstract::Restored riparian wetlands in the Upper Mississippi River basin have potential to remove sediment and nutrients from tributaries before they flow into the Mississippi River. For 3 yr we calculated retention efficiencies of a marsh complex, which consisted of a restored marsh and an adjacent natural marsh that were con...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2012.0248
更新日期:2013-03-01 00:00:00
abstract::Soil contaminated with 2,4,6-trinitrotoluene (TNT) and spiked with [14C]- and [15N3]-TNT was subjected to an anaerobic-aerobic soil slurry treatment and subsequently analyzed by radiocounting and solid-state 15N nuclear magnetic resonance (NMR) spectroscopy. This treatment led to a complete disappearance of extractabl...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.302403x
更新日期:2001-03-01 00:00:00
abstract::The Langmuir model is commonly used for describing the sorption behavior of reactive solutes to surfaces and is often fit to sorption data using nonlinear least squares regression. An important assumption of least squares regression is that the predictor variable is error free. In the case of sorption data, this assum...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0461
更新日期:2008-08-08 00:00:00
abstract::Unusually high cation exchange capacity (CEC) values relative to clay content are frequently reported for lignite overburden and minesoils. The CEC to percent clay ratio is commonly greater than one and would require that the average charge of the clay fraction be greater than 100 cmol(c) kg(-1). A comparison of metho...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.3041143x
更新日期:2001-07-01 00:00:00
abstract::Metal-thiol complexes can enhance metal uptake by plant roots and microorganisms, therefore it is important to determine whether thiols effectively solubilize these metals from the soil matrix. Extractions were conducted by combining 1 g contaminated soil and 10 mL of 10 mmol L(-1) thiol solution and shaking for 1 h. ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2008.0524
更新日期:2009-10-29 00:00:00
abstract::Nitrogen (N) availability affects plant biomass yield and, hence, phytoextraction of contaminants during phytoremediation of end-of-life municipal lagoons. End-of-life lagoons are characterized by fluctuating moisture conditions, but the effects on biosolid N dynamics have not been adequately characterized. This 130-d...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2015.02.0084
更新日期:2015-11-01 00:00:00
abstract::This paper reports the use of a new technique, flow field-flow fractionation (FlFFF), for the characterization of soil sampled under grassland. FlFFF can be used to determine the fine colloidal material in the <1 microm fraction obtained by gravitational settling of 1% m/v soil suspensions. The aim of this work was to...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0583
更新日期:2008-06-23 00:00:00
abstract::Increased use of neonicotinoid-coated crop seeds introduces greater amounts of insecticides into the environment, where they are vulnerable to transport. To understand the transport of neonicotinoids from agricultural fields, we planted maize seeds coated with thiamethoxam in lysimeter plots in central Pennsylvania, U...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.1002/jeq2.20185
更新日期:2020-12-23 00:00:00
abstract::A vegetated filter strip (VFS) is a measure commonly implemented in agricultural landscapes for the purpose of improving water quality. However, much of the evidence to support their effectiveness comes from warm regions dominated by rainfall driven runoff. This study assessed the performance of VFS plots and compared...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2018.12.0452
更新日期:2019-07-01 00:00:00
abstract::Conversions of Mollisols from prairie to cropland and subsequent changes in crop production practices in the Midwestern USA have resulted in changes in soil organic matter. Few studies have used archived samples, long-term resampling of soils to a depth of 1 m, and space for time studies to document these changes. We ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2008.0132
更新日期:2009-01-13 00:00:00
abstract::Loss of nitrate from agricultural lands to surface waters is an important issue, especially in areas that are extensively tile drained. To reduce these losses, a wide range of in-field and edge-of-field practices have been proposed, including constructed wetlands. We re-evaluated constructed wetlands established in 19...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2014.10.0415
更新日期:2015-05-01 00:00:00
abstract::To integrate biochar as a practical and successful remedial amendment at northern landfarms, components of its formulation and application must be optimized for site-specific environmental conditions. Different biochar amendments were applied to petroleum hydrocarbon (PHC)-contaminated soil at two northern field sites...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2017.01.0038
更新日期:2017-07-01 00:00:00
abstract::The purpose of this study was to determine the response of antibiotics and antibiotic resistance genes (ARG) to manure management. A pilot field study was conducted using horse manure containing no antibiotics, into which chlortetracycline (CTC), tylosin (TYL), and monensin (MON) were spiked and compared to unspiked c...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0006
更新日期:2007-10-16 00:00:00
abstract::Pig (Sus scrofa domesticus) slurry (PS) is commonly applied as fertilizer to agricultural fields. Knowledge of PS nitrogen content is essential for good management, but PS nitrogen content is highly variable, not only between farms but also within a farm. Laboratory analysis of animal slurries is often expensive and i...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2011.0352
更新日期:2012-05-01 00:00:00
abstract::An outdoor, solar illuminated growth chamber with modulated UV-B enhancement, is described and its performance characterized. The chamber was clad with Teflon film that transmitted both UV-A and UV-B with little absorption and whose transmission did not change significantly over 1 yr. An array of UV-B emitting fluor...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq1997.00472425002600030037x
更新日期:1997-05-01 00:00:00