Abstract:
:Quantum dots (QDs) of two different surface chemistries (carboxyl [COOH] and polyethylene glycol [PEG] modified) were utilized to determine the impact of surface functionality on QD mobility and distribution in Pseudomonas aeruginosa PAO1 biofilms. Confocal laser scanning microscopy was utilized to evaluate QD association with biofilm components (proteins, cells, and polysaccharides). Quantum dots did not preferentially associate with cell surfaces compared but did colocalize with extracellular proteins in the biofilm matrix. Neither PEG nor COOH QDs were found to be internalized by individual bacterial cells. Neither QD functionality nor flow rate of QD application (0.3 mL min(-1) or 3.0 mL min(-1)) resulted in a marked difference in QD association with P. aeruginosa biofilms. However, center of density determinations indicated COOH QDs could more easily penetrate the biofilm matrix by diffusion than PEG QDs. Biofilms with PEG QDs associated had rougher polysaccharide layers and rougher cell distribution than biofilms with COOH QDs. This work suggests natural biofilms may serve as deposition locations in natural and engineered environmental systems, and biofilm structural parameters may change based on exposure to nanomaterials of varied physical characteristics.
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Morrow JB,Arango CP,Holbrook RDdoi
10.2134/jeq2009.0455subject
Has Abstractpub_date
2010-11-01 00:00:00pages
1934-41issue
6eissn
0047-2425issn
1537-2537journal_volume
39pub_type
杂志文章abstract::We investigated the seasonal patterns of denitrification rates and potentials in soil profiles along the topohydrosequence formed at the upland-wetland interface in three riparian wetlands with different vegetation cover (i.e., forest, understory vegetation, and grass). Denitrification was measured using the acetylene...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2002.1025
更新日期:2002-05-01 00:00:00
abstract::Antibiotics may appear in the environment when manure, sewage sludge, and other organic amendments are added to soils. There is concern that the presence of antibiotics in soils may lead to the development of antibiotic-resistant bacteria which may spread to the rest of the environment. This paper aims at evaluating t...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2005.0355
更新日期:2006-05-31 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::Isotopically exchangeable metals in soil, also termed labile metals, are reversibly bound to soil surface and are a better index of the environmental risk of the metals than are their total concentrations. In this study, labile fractions of potentially toxic elements were surveyed in metal mining-impacted soils of Mex...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.1002/jeq2.20055
更新日期:2020-03-01 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::Intensively managed golf courses are perceived by the public as possibly adding nutrients to surface waters via surface transport. An experiment was designed to determine the transport of nitrate N and phosphate P from simulated golf course fairways of 'Tifway' bermudagrass [Cynodon dactylon (L.) Pers.]. Fertilizer tr...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2002.1710
更新日期:2002-09-01 00:00:00
abstract::Excessive loading of sediment and nutrients to rivers is a major problem in many parts of the United States. In this study, we tested the non-parametric Seasonal Kendall (SEAKEN) trend model and the parametric USGS Quality of Water trend program (QWTREND) to quantify trends in water quality of the Minnesota River at F...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2008.0250
更新日期:2009-03-25 00:00:00
abstract::Elevated carbon dioxide (CO2) concentrations in the atmosphere can stimulate plant growth and yield, whereas ground-level ozone (O3) concentrations cause the opposite effect in many areas of the world. Recent experiments show that elevated CO2 can protect some plants from O3 stress, but this has not been tested for mo...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2003.1603
更新日期:2003-09-01 00:00:00
abstract::Three promising phytoextracting perennial weed species [ L. (ox-eye daisy), L. (curly dock), and L. (Canada goldenrod)] were planted in monoculture plots at two polychlorinated biphenyl (PCB)-contaminated sites in southern Ontario and followed over 2 yr to investigate the effects of plant age, contaminant characteri...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2011.0144
更新日期:2011-11-01 00:00:00
abstract::Determining the survival of zoonotic pathogens in livestock manure and runoff is critical for understanding the environmental and public health risks associated with these wastes. The occurrence and persistence of the bacterial pathogens Escherichia coli O157:H7 and Campylobacter spp. in a passive beef cattle feedlot ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0100
更新日期:2007-10-24 00:00:00
abstract::Synthetic nitrogen fertilizer has been a double-edged sword, greatly improving human nutrition during the 20th century but also posing major human health and environmental challenges for the 21st century. In August 2013, about 160 agronomists, scientists, extension agents, crop advisors, economists, social scientists,...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2015.02.0078
更新日期:2015-03-01 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::The New York Phosphorus Index (NY-PI) was introduced in 2001 after the release of the state's first Concentrated Animal Feeding Operation (CAFO) Permit that required a nutrient management plan developed in accordance with NRCS standards. The stakeholder-based approach to development of the NY-PI, combined with a requi...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2016.05.0185
更新日期:2017-11-01 00:00:00
abstract::A significant portion of the NO3 from agricultural fields that contaminates surface waters in the Midwest Corn Belt is transported to streams or rivers by subsurface drainage systems or "tiles." Previous research has shown that N fertilizer management alone is not sufficient for reducing NO3 concentrations in subsurfa...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2006.0468
更新日期:2007-08-31 00:00:00
abstract::Alum [Al(SO4) ·14HO] addition to poultry litter has been shown to reduce ammonia (NH) concentrations in poultry houses; however, its effects on greenhouse gas (GHG; NO, CH, and CO) emissions is unknown. The objectives of this study were to determine the effects of alum additions on (i) in-house NH and GHG concentratio...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2014.09.0404
更新日期:2015-09-01 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::Subsurface tile drains in agricultural systems of the midwestern United States are a major contributor of nitrate-N (NO-N) loadings to hypoxic conditions in the Gulf of Mexico. Hydrologic and water quality models, such as the Soil and Water Assessment Tool, are widely used to simulate tile drainage systems. The Hoogho...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2013.01.0018
更新日期:2013-11-01 00:00:00
abstract::The influence of different environmental factors on methane oxidation and degradation of hydrochlorofluorocarbons (HCFCs) was investigated in microcosms containing soil sampled at Skellingsted Landfill, Denmark. The soil showed a high capacity for methane oxidation resulting in a maximum oxidation rate of 104 microg C...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2004.7200
更新日期:2004-01-01 00:00:00
abstract::Many attempts have been made worldwide to develop methods to identify the areas most threatened by soil degradation. Some soils in afflicted areas may be irreversibly degraded and thus have very little resilience (the ability to restore themselves). For the purpose of assessing the current state of soil degradation in...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2014.05.0233
更新日期:2015-01-01 00:00:00
abstract::Phosphorus (P) loss from agricultural fields can contribute to water quality degradation. The current New York P index (NY-PI) scores fields on the basis of P sources and field characteristics that reflect risk of P transport (a source × transport approach). Recently, a transport × best management practice (BMP) appro...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2019.01.0010
更新日期:2019-07-01 00:00:00
abstract::Bedding materials may affect air quality in livestock facilities. Our objective in this study was to compare headspace concentrations of ammonia (NH), total reduced sulfides (TRS), carbon dioxide (CO), methane (CH), and nitrous oxide (NO) when pine wood chips ( spp.) and corn stover ( L.) were mixed in various ratios ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2015.09.0466
更新日期:2016-03-01 00:00:00
abstract::Excessive or N-based application of poultry manure for crops may result in significant risk of P loss with surface runoff. This study assessed P loss immediately after poultry manure application to soybean [Glycine max (L.) Merr.] residue with and without tillage at eight Iowa fields. Manure from chickens (Gallus gall...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0628
更新日期:2009-01-13 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::Quantification of soil carbon (C) cycling as influenced by management practices is needed for C sequestration and soil quality improvement. We evaluated the 10-yr effects of tillage, cropping system, and N source on crop residue and soil C fractions at 0- to 20-cm depth in Decatur silt loam (clayey, kaolinitic, thermi...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2007.0241
更新日期:2008-05-02 00:00:00
abstract::Due to its resistance to many wastewater treatment processes, the antiepileptic drug carbamazepine (CBZ) is routinely found in wastewater effluent. Wastewater irrigation is an alternative to stream discharge of wastewater effluent, which utilizes the soil as a tertiary filter to remove excess nutrients and has the pot...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2011.0193
更新日期:2012-07-01 00:00:00
abstract::Acidification of livestock manure can reduce emission of the greenhouse gases methane (CH) and nitrous oxide (NO), as well as ammonia (NH). We examined the relation between emission of these gases and transformation of organic matter as affected by acidification. Liquid cattle manure was acidified with sulfuric acid t...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2016.10.0409
更新日期:2017-05-01 00:00:00
abstract::Is nitrate harmful to humans? Are the current limits for nitrate concentration in drinking water justified by science? There is substantial disagreement among scientists over the interpretation of evidence on the issue. There are two main health issues: the linkage between nitrate and (i) infant methaemoglobinaemia, a...
journal_title:Journal of environmental quality
pub_type: 杂志文章,评审
doi:10.2134/jeq2007.0177
更新日期:2008-02-11 00:00:00
abstract::Very little has been reported on the effects of pH, Zn, and Mn on Cd uptake in rice ( L.) and their levels under field conditions. Rice accumulates a high concentration of Cd in acid soils, even at low soil Cd levels. Lime (CaO) was spread at 1200 kg ha on the topsoil of a rice field during the tillering stage. Effect...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2017.06.0237
更新日期:2018-03-01 00:00:00
abstract::Escherichia coli is a ubiquitous component of the intestinal microflora of warm-blooded animals, and is an indicator of fecal contamination of surface waters. Ribotype profiling of E. coli is one of several genotypic methods that has been developed to determine the host origin of fecal bacteria. Like most genotypic me...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2003.3050
更新日期:2003-01-01 00:00:00
abstract::Wetland soils are able to exhibit both consumption and production of greenhouse gases, and they play an important role in the regulation of the global carbon (C) cycle. Still, it is challenging to accurately evaluate the actual amount of C stored in wetlands. The incorporation of remote sensing data into digital soil ...
journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2016.03.0076
更新日期:2016-11-01 00:00:00