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1. Inconspicuous Reactions Identified by Improved Precision of Plasmonic Scattering Dark-Field Microscopy Imaging Using Silver Shell-Isolated Nanoparticles as Internal References

Author:
Feng, Wei; He, Wei; Zhou, Jun; Gu, Xiao Ying; Li, Yuan Fang; Huang, Cheng Zhi
Source:
Analytical chemistry 2019 v.91 no.4 pp. 3002-3008
ISSN:
1520-6882
Subject:
dissolved oxygen,   etc   ; image analysis; mercury; microscopy; nanoparticles; nanosilver; oxidation; silver;     Show all 8 Subjects
Abstract:
... Investigating a reaction that is inconspicuously weak, slow, or coexists with other fast reactions is interesting since that can supply a capability to find new reactions or explore indecisive mechanisms, but the strategies for the investigations are still greatly limited. Herein, we apply the strategy of “finding from the data” to discuss inconspicuous reactions through improving the confidence l ...
DOI:
10.1021/acs.analchem.8b05285

2. Factors influencing the accuracy of the denitrifier method for determining the oxygen isotopic composition of nitrate

Author:
Zhang, Man; Shi, Jia-chun; Wu, Lao-sheng
Source:
Journal of Zhejiang University 2019 v.20 no.1 pp. 49-58
ISSN:
1673-1581
Subject:
dissolved oxygen,   etc   ; denitrifying microorganisms; models; nitrates; nitrogen; oxygen; stable isotopes;     Show all 7 Subjects
Abstract:
... The denitrifier method is widely used as a novel pretreatment method for the determination of nitrogen and oxygen isotope ratios as it can provide quantitative and high-sensitivity measurements. Nevertheless, the method is limited by relatively low measurement accuracy for δ¹⁸O. In this study, we analyzed the factors influencing the accuracy of δ¹⁸O determination, and then systematically investiga ...
DOI:
10.1631/jzus.B1800197

3. Poly(3-hydroxybutyrate) accumulation by Azotobacter vinelandii under different oxygen transfer strategies

Author:
Díaz-Barrera, Alvaro; Urtuvia, Viviana; Padilla-Córdova, Claudio; Peña, Carlos
Source:
Journal of industrial microbiology & biotechnology 2019 v.46 no.1 pp. 13-19
ISSN:
1367-5435
Subject:
dissolved oxygen,   etc   ; Azotobacter vinelandii; agitation; bacteria; bioreactors; mixing; oxygen;     Show all 7 Subjects
Abstract:
... Azotobacter vinelandii OP is a bacterium that produces poly(3-hydroxybutyrate) (PHB). PHB production in a stirred bioreactor, at different oxygen transfer strategies, was evaluated. By applying different oxygen contents in the inlet gas, the oxygen transfer rate (OTR) was changed under a constant agitation rate. Batch cultures were performed without dissolved oxygen tension (DOT) control (using 9% ...
DOI:
10.1007/s10295-018-2090-9

4. Acute and chronic toxicity of nickel to nitrifiers at different temperatures

Author:
Liu, Xiaoguang; Chowdhury, Mohammad M.I.; Zaman, Masuduz; Kim, Mingu; Nakhla, George
Source:
Journal of environmental sciences (China) 2019 v.82 pp. 169-178
ISSN:
1001-0742
Subject:
dissolved oxygen,   etc   ; acclimation; ammonia; chronic toxicity; nickel; nitrification; nitrifying bacteria; nitrites; temperature; wastewater;     Show all 10 Subjects
Abstract:
... This study investigated the acute nickel toxicity on nitrification of low ammonia synthetic wastewater at 10, 23, and 35°C. The nickel inhibition half-velocity constants (KI,Ni) for ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) based on Ni/MLSS ratio at 10, 23, and 35°C were 5.4 and 5.6 mg Ni/g MLSS, 4.6 and 3.5 mg Ni/g MLSS, and 9.1 and 2.7 mg Ni/g MLSS, respectively. In a ...
DOI:
10.1016/j.jes.2019.03.009

5. A durable and inexpensive pump profiler to monitor stratified water columns with high vertical resolution

Author:
Hudson, Jeffrey M.; MacDonald, Daniel J.; Estes, Emily R.; Luther, George W.
Source:
Talanta 2019 v.199 pp. 415-424
ISSN:
0039-9140
Subject:
dissolved oxygen,   etc   ; air; bottles; detection limit; hydrogen sulfide; microelectrodes; oxygen; pumps; temperature;     Show all 9 Subjects
Abstract:
... A pump profiling system for real time sample collection has been constructed for a cost of <$1000 (USD) and mated with a ship’s rosette that has conductivity, temperature, depth (CTD) and other sensors. The system permits the collection of ~15 L of water in one minute without exposure to O2 from air for discrete sampling of chemical, microbial and other constituents as well as for real time analys ...
DOI:
10.1016/j.talanta.2019.02.076

6. Performance, microbial community evolution and neural network modeling of single-stage nitrogen removal by partial-nitritation/anammox process

Author:
Antwi, Philip; Zhang, Dachao; Luo, Wuhui; Xiao, Long wen; Meng, Jia; Kabutey, Felix Tetteh; Ayivi, Frederick; Li, Jianzheng
Source:
Bioresource technology 2019 v.284 pp. 359-372
ISSN:
0960-8524
Subject:
dissolved oxygen,   etc   ; ammonium nitrogen; mathematical models; microbial communities; nitrogen; prediction; ribosomal RNA; wastewater;     Show all 8 Subjects
Abstract:
... Single-stage nitrogen removal by anammox/partial-nitritation (SNAP) process was proposed and explored in a packed-bed-EGSB reactor to treat nitrogen-rich wastewater. With dissolved oxygen (DO) maintained within 0.2–0.5 mg/L, reactor performance and microbial community dynamics were evaluated and reported. To ascertain whether control/prediction of the SNAP process was feasible with mathematical mo ...
DOI:
10.1016/j.biortech.2019.03.008

7. A comparison of the effects of natural organic matter on sulfidated and nonsulfidated nanoscale zerovalent iron colloidal stability, toxicity, and reactivity to trichloroethylene

Author:
Han, Yitong; Ghoshal, Subhasis; Lowry, Gregory V.; Chen, Jiawei
Source:
The Science of the total environment 2019 v.671 pp. 254-261
ISSN:
0048-9697
Subject:
dissolved oxygen,   etc   ; corrosion; cytotoxicity; groundwater; humic acids; iron; pH; remediation; rivers; sodium sulfide; temperature; trichloroethylene;     Show all 12 Subjects
Abstract:
... Sulfidated nanoscale zerovalent iron (S-NZVI) is a new remediation material with higher reactivity and greater selectivity for chlorinated organic contaminants such as trichloroethene (TCE) than NZVI. The properties of S-NZVI and the effects of groundwater constituents like natural organic matter (NOM) on its reactivity are less well-characterized than for NZVI. In this study, S-NZVI (Fe/S mole ra ...
DOI:
10.1016/j.scitotenv.2019.03.343

8. Effect over the elongation growth acceleration of root segments of Zea Mays L. due to elevated external pressure

Author:
Suslov, M.A.; Anisimov, A.V.
Source:
Environmental and experimental botany 2019 v.162 pp. 239-246
ISSN:
0098-8472
Subject:
dissolved oxygen,   etc   ; Zea mays; apoplast; cell walls; corn; mathematical models; mercuric chloride; roots; water potential; xylem;     Show all 10 Subjects
Abstract:
... The effect of elevated external pressure on the acceleration of elongation growth in maize root segments was studied. The growth rate of segments increases approximately by 2–2.5 times with the increase in the external pressure of up to 0.5–1 MPa. The dependence of segments’ elongation with the external pressure magnitude is shown for 0.25–2 MPa. Pre-treatment of root segments with a mercury chlor ...
DOI:
10.1016/j.envexpbot.2019.03.001

9. Microbial effects on hydraulic conductivity estimation by single-well injection tests in a petroleum-contaminated aquifer

Author:
Zhu, Qi; Wen, Zhang; Liu, Hui
Source:
Journal of hydrology 2019 v.573 pp. 352-364
ISSN:
0022-1694
Subject:
dissolved oxygen,   etc   ; biomass; confined aquifer; hydraulic conductivity; mathematical models; microbial growth; microorganisms; petroleum;     Show all 8 Subjects
Abstract:
... Single-well injection tests in a petroleum-contaminated region stimulate microbial growth and cause bioclogging because of the intrusion of elevated dissolved oxygen (DO), which may affect the hydraulic conductivity (K) estimation. In this study, we developed a mathematical model considering multispecies and multiphase reactive transport and bioclogging for a single-well injection test in a confin ...
DOI:
10.1016/j.jhydrol.2019.03.031

10. Variations of culture parameters in a pilot-scale thin-layer reactor and their influence on the performance of Scenedesmus almeriensis culture

Author:
Barceló-Villalobos, M.; Serrano, C. Gómez; Zurano, A. Sánchez; García, L. Alameda; Maldonado, S. Esteve; Peña, J.; Fernández, F.G. Acién
Source:
Bioresource technology reports 2019 v.6 pp. 190-197
ISSN:
2589-014X
Subject:
dissolved oxygen,   etc   ; Scenedesmus; industrial applications; light intensity; models; pH; photoperiod; photosynthesis; temperature;     Show all 9 Subjects
Abstract:
... The variations in culture conditions (irradiance, temperature, pH and dissolved oxygen) in a thin-layer 120 m2 surface reactor have been studied, both in terms of position inside the reactor and time of the daylight cycle. Results demonstrate that average irradiance and temperature to which the cells are exposed are mainly a function of time, whereas pH and dissolved oxygen concentrations also sho ...
DOI:
10.1016/j.biteb.2019.03.007

11. The mechanism for promoted oxygenation of V(IV) by goethite: Positive effect of surface hydroxyl groups

Author:
Hu, Xingyun; Peng, Xianjia; Kong, Linghao; Zhu, Feng
Source:
Journal of hazardous materials 2019 v.369 pp. 254-260
ISSN:
0304-3894
Subject:
dissolved oxygen,   etc   ; electron transfer; goethite; ions; iron; iron oxyhydroxides; moieties; oxidation; pH; risk; toxicity; vanadium;     Show all 12 Subjects
Abstract:
... The most toxic and mobile form of vanadium (V) is V(V). Thus, the oxidation of V is a subject of considerable importance since the process may increase environmental risks of V. V(IV) is known to be stable when pH < 4.5. However, in this study, stable V(IV) was oxidized almost completely in goethite suspension within 60 min at pH 2.0 and pH 4.0, correspondingly, only 25%–30% and 15%–20% of V(IV) w ...
DOI:
10.1016/j.jhazmat.2019.02.040

12. Effect of dissolved oxygen on efficiency of TOC reduction by UV at 185 nm in an ultrapure water production system

Author:
Choi, Jeongyun; Chung, Jinwook
Source:
Water research 2019 v.154 pp. 21-27
ISSN:
0043-1354
Subject:
dissolved oxygen,   etc   ; hydrogen peroxide; irradiation; methanol; mixing; total organic carbon; ultraviolet radiation;     Show all 7 Subjects
Abstract:
... The effect of dissolved oxygen (DO) on the degradation of methanol by ultraviolet (UV) light at 185 nm (UV-185) was examined in this study. The experiments were conducted using a bench-scale experimental apparatus that was operated under continuous conditions. In the control tests with various DO conditions, it was confirmed that UV irradiation of water without methanol produced approximately 54 μ ...
DOI:
10.1016/j.watres.2019.01.037

13. Identifying cross-well fracture connections using the dissolved oxygen alteration method

Author:
Vitale, Sarah A.; Robbins, Gary A.; Romanowicz, Edwin
Source:
Journal of hydrology 2019 v.572 pp. 781-789
ISSN:
0022-1694
Subject:
dissolved oxygen,   etc   ; aeration; bedrock; geophysics; tracer techniques; water quality; wells; Connecticut;     Show all 8 Subjects
Abstract:
... Determining how wells in fractured crystalline bedrock are interconnected is essential in defining contaminant flow paths and in interpreting water quality data from wells. Although various tracers and geophysical techniques have been used with success, the high cost or logistics may restrict their implementation. This study demonstrates a low-cost technique for identifying fracture connections be ...
DOI:
10.1016/j.jhydrol.2019.03.070

14. Comparison of short-term dosing ferrous ion and nanoscale zero-valent iron for rapid recovery of anammox activity from dissolved oxygen inhibition

Author:
Yan, Yuan; Wang, Yayi; Wang, Weigang; Zhou, Shuai; Wang, Junjie; Guo, Jianhua
Source:
Water research 2019 v.153 pp. 284-294
ISSN:
0043-1354
Subject:
dissolved oxygen,   etc   ; anaerobes; anaerobic ammonium oxidation; ions; iron; nitrifying bacteria; oxygen; pH; polysaccharides; superoxide anion;     Show all 10 Subjects
Abstract:
... As obligate anaerobes, anammox bacteria are sensitive to oxygen, which might hinder the maximization of anammox activity. However, there are very few effective strategies to rapidly recover anammox activity after its deterioration under exposure of oxygen. In this study, the activity recovery of anammox bacteria encountering dissolved oxygen (DO) exposure (0.2 and 2.0 mg L−1) were compared by thre ...
DOI:
10.1016/j.watres.2019.01.029

15. Capturing the oxic transformation of iopromide – A useful tool for an improved characterization of predominant redox conditions and the removal of trace organic compounds in biofiltration systems?

Author:
Müller, Johann; Jewell, Kevin S.; Schulz, Manoj; Hermes, Nina; Ternes, Thomas A.; Drewes, Jörg E.; Hübner, Uwe
Source:
Water research 2019 v.152 pp. 274-284
ISSN:
0043-1354
Subject:
dissolved oxygen,   etc   ; aerobic conditions; biodegradability; biodegradation; biofiltration; microbial activity; monitoring; nitrates; oxygen; tracer techniques; triazoles;     Show all 11 Subjects
Abstract:
... The biological degradation of many trace organic compounds has been reported to be strongly redox dependent. The traditional characterization of redox conditions using the succession of inorganic electron acceptors such as dissolved oxygen and nitrate falls short in accurately describing the critical transition state between oxic and suboxic conditions. Novel monitoring strategies using intrinsic ...
DOI:
10.1016/j.watres.2018.12.055

16. Efficient novel amphiphilic double shells layer coupled with nanoscale zero-valent composite for the degradation of trichloroethylene

Author:
Li, Can; Lu, Qiang; Zhan, Cong; Tariq, Muhammad; Huang, Kai; Liu, Fuwen; Zhu, Fei; Liu, Guanhong; Cui, Changzheng; Lin, Kuangfei
Source:
The Science of the total environment 2019 v.659 pp. 821-827
ISSN:
0048-9697
Subject:
dissolved oxygen,   etc   ; adsorption; air; aqueous solutions; chitosan; iron; mass transfer; nanocomposites; oxidation; pH; trichloroethylene;     Show all 11 Subjects
Abstract:
... An efficient novel amphiphilic material composed of core-double shells nanocomposite (CDSN) with nanoscale zero-valent iron (NZVI) as the core and PS100-b-PAA16 as inner shell and chitosan as outmost shell has been synthesized successfully. Its application to remove the trichloroethylene (TCE) in stimulated TCE solution with 7.3 ± 0.3 mg/L dissolved oxygen was investigated. The results showed that ...
DOI:
10.1016/j.scitotenv.2018.12.301

17. Study of dissolved oxygen responses to tropical cyclones in the Bay of Bengal based on Argo and satellite observations

Author:
Xu, Huabing; Tang, Danling; Sheng, Jinyu; Liu, Yupeng; Sui, Yi
Source:
The Science of the total environment 2019 v.659 pp. 912-922
ISSN:
0048-9697
Subject:
dissolved oxygen,   etc   ; Mora; biochemical pathways; hurricanes; mixing; oxygen; remote sensing; satellites; temporal variation; Bay of Bengal;     Show all 10 Subjects
Abstract:
... Effects of tropical cyclones (TCs) on dissolved oxygen (DO) in subsurface waters (20–200 m) over the Oxygen Minimum Zones (OMZs) in the Bay of Bengal (BoB) are examined based on Argo and satellite data. Five TCs (Hudhud, Five, Vardah, Maarutha and Mora) during 2013–2018 are considered. Analyses reveal three types of DO temporal variability caused by the storm-induced mixing and upwelling. The firs ...
DOI:
10.1016/j.scitotenv.2018.12.384

18. Degradation of tetra- and trichloroethylene under iron reducing conditions by Acidimicrobiaceae sp. A6

Author:
Ge, Jinyi; Huang, Shan; Han, Il; Jaffé, Peter R.
Source:
Environmental pollution 2019 v.247 pp. 248-255
ISSN:
0269-7491
Subject:
dissolved oxygen,   etc   ; Acidimicrobiaceae; Geobacter metallireducens; ammonium; aquifers; bioremediation; enrichment culture; iron; oxidation; soil; tetrachloroethylene; trichloroethylene;     Show all 12 Subjects
Abstract:
... The degradation of trichloroethylene (TCE) and tetrachloroethylene (PCE), in incubations where ammonium was oxidized while iron was being reduced indicates that these compounds can be degraded during the Feammox process by Acidimicrobiaceae sp. A6 (ATCC, PTA-122488). None of these compounds were degraded in incubations to which no ammonium was added, indicating that they were degraded during the o ...
DOI:
10.1016/j.envpol.2019.01.066

19. New insights into mechanism of direct UV photolysis of p-arsanilic acid

Author:
Tyutereva, Yuliya E.; Sherin, Petr S.; Parkhats, Marina V.; Liu, Zizheng; Xu, Jing; Wu, Feng; Plyusnin, Victor F.; Pozdnyakov, Ivan P.
Source:
Chemosphere 2019 v.220 pp. 574-581
ISSN:
0045-6535
Subject:
dissolved oxygen,   etc   ; arsenic; cations; ionization; liquid chromatography; mass spectrometry; photolysis; singlet oxygen; veterinary drugs; wavelengths;     Show all 10 Subjects
Abstract:
... The mechanism of direct UV photolysis of p-arsanilic acid (p-ASA), a widely used veterinary drug, was revised by means of laser flash photolysis coupled with high resolution liquid chromatography – mass spectrometry (LC-MS). None of p-ASA triplet state or singlet oxygen was found to directly participate in the photodegradation of p-ASA as it was assumed in previous works. Here we demonstrate that ...
DOI:
10.1016/j.chemosphere.2018.12.179

20. Dissolved oxygen prediction method for recirculating aquaculture system, based on a timing attenuation matrix and a convolutional neural network

Author:
Ta, Xuxiang; An, Dong; Wei, Yaoguang
Source:
Aquaculture 2019 v.503 pp. 26-33
ISSN:
0044-8486
Subject:
dissolved oxygen,   etc   ; aquatic organisms; financial economics; hysteresis; models; prediction; recirculating aquaculture systems; time series analysis;     Show all 8 Subjects
Abstract:
... Dissolved oxygen (DO) plays a crucial role in recirculating aquaculture systems. The DO concentration determines the biological growth of aquatic organisms and the final economic benefits. Considering the hysteresis effect of DO increments in recirculating aquaculture, as well as the complex relationships among influencing parameters, this paper describes a method of DO prediction, based on a long ...
DOI:
10.1016/j.aquaculture.2018.12.079