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Leif L Marking - One of the best experts on this subject based on the ideXlab platform.
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salinity and temperature effects on chronic toxicity of 2 4 diNitrophenol and 4 Nitrophenol to sheepshead minnows cyprinodon variegatus
Environmental Toxicology and Chemistry, 1994Co-Authors: T K Linton, Foster L. Mayer, Tasha L Simon, Janice A Malone, Leif L MarkingAbstract:Toxicity tests (28-d early-life-stage) were conducted to determine the effects of nine combinations of salinity (15, 20, 25 ppt) and temperature (22, 27, 32°C) on the toxicity of 2,4-diNitrophenol (2,4-DNP) and 4-Nitrophenol (4-NP) to sheepshead minnows (Cyprinodon variegatus). The highest tested concentration having no observed effect (NOEC) on mortality and growth was derived weekly. The NOECs at test termination indicated that the survival and growth of fish exposed to 2,4-diNitrophenol were not significantly affected by salinity, temperature, or the salinity temperature interaction. However, 28-d NOECs of fish surviving from 4-Nitrophenol exposures were significantly affected by temperature, but the highest value exceeded the lowest by only a factor of two. The overall data suggest that variations of salinity and temperature do not change the NOEC; only the exposure time required to attain the same NOEC is altered.
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acute toxicity of 4 Nitrophenol 2 4 diNitrophenol terbufos and trichlorfon to grass shrimp palaemonetes spp and sheepshead minnows cyprinodon variegatus as affected by salinity and temperature
Environmental Toxicology and Chemistry, 1994Co-Authors: Jeri A Breckenfolse, Foster L. Mayer, Leslie E Pedigo, Leif L MarkingAbstract:The toxicities of two industrial chemicals (4-Nitrophenol and 2,4-diNitrophenol) and two organophosphate insecticides (terbufos and trichlorfon) to juvenile grass shrimp (Palaemonetes spp.) and sheepshead minnows (Cyprinodon variega-tus) were determined by static, 96-h toxicity tests in a factorial design with 12 combinations of salinity and temperature (15, 20, 25, 30 ppt × 17, 22, 27°C). Concentrations of the toxicants, including bioconcentration, were determined as appropriate by gas or liquid chromatography and the use of 14C-labeled compounds. The 96-h LC50s for 4-Nitrophenol ranged from 12 to 31 mg/L and for 2,4-diNitrophenol from 13 to 50 mg/L. Toxicity decreased as salinity increased for 4-Nitrophenol and both test organisms. Toxicity decreased as salinity increased for 2,4-diNitrophenol and sheepshead minnows, but toxicity to grass shrimp increased as salinity increased. Toxicity decreased with increased temperature for grass shrimp exposed to 2,4-diNitrophenol and sheepshead minnows exposed to 4-Nitrophenol, increased with temperature for sheepshead minnows exposed to 2,4-diNitrophenol, and no change was observed for grass shrimp exposed to 4-Nitrophenol. Bioconcentration of phenols in both test organisms increased as concentration increased. The 96-h LC50s for terbufos ranged from 3.4 to 6.6 μg/L and for trichlorfon from 6.3 to 19,300 μg/L. Terbufos and trichlorfon toxicity to grass shrimp and sheepshead minnows increased with increased temperature. BCFs for terbufos were greater in sheepshead minnows than grass shrimp, but were reversed for trichlorfon.
Bin Wang - One of the best experts on this subject based on the ideXlab platform.
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Effect of inoculation of Burkholderia sp strain SJ98 on bacterial community dynamics and para-Nitrophenol, 3-methyl-4-Nitrophenol, and 2-chloro-4-Nitrophenol degradation in soil
Scientific reports, 2017Co-Authors: Jun Min, Bin WangAbstract:para-Nitrophenol (PNP), 3-methyl-4-Nitrophenol (3M4NP), and 2-chloro-4-Nitrophenol (2C4NP) are highly toxic compounds that have caused serious environmental issues. We inoculated an artificially contaminated soil with Burkholderia sp. strain SJ98, which has the ability to degrade PNP, 3M4NP, and 2C4NP, and quantified bioremediation. There was accelerated degradation of all Nitrophenols in inoculated treatments compared to the un-inoculated treatments. The indigenous bacteria were able to degrade PNP, but not 3M4NP or 2C4NP. Real-time PCR targeting the catabolic gene pnpA showed that levels of strain SJ98 remained stable over the incubation period. High-throughput sequencing revealed that both contamination and bioaugmentation influenced the bacterial community structure. Bioaugmentation seemed to protect Kineosporia, Nitrososphaera, and Schlesneria from Nitrophenol inhibition, as well as led to a sharp increase in the abundance of Nonomuraea, Kribbella, and Saccharopolyspora. There was a significant increase in the relative abundances of Thermasporomyces, Actinomadura, and Streptomyces in both contaminated and bioaugmented treatments; this indicated that these bacteria are likely directly related to Nitrophenol degradation. To our knowledge, this is the first report of the simultaneous removal of PNP, 3M4NP, and 2C4NP using bioaugmentation. This study provides valuable insights into the bioremediation of soils contaminated with Nitrophenols.
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facile synthesis of cubical co3o4 supported au nanocomposites with high activity for the reduction of 4 Nitrophenol to 4 aminophenol
RSC Advances, 2016Co-Authors: Yuwen Yang, Bin Wang, Yongyun Mao, Xianwei Meng, Jiao Han, Chuan Wang, Hongwei YangAbstract:Cubic Co3O4 supported Au nanocomposites have been synthesized via a facile impregnation method. The Au/Co3O4 exhibited excellent catalytic activity for the reduction of 4-Nitrophenol (TOF = 9.83 min−1). The unique structure and high catalytic performance make the materials highly promising candidates for diverse applications in the area of catalysis.
Takayoshi Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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thz emission from organic cocrystalline salt 2 6 diaminopyridinium 4 Nitrophenolate 4 Nitrophenol
Optics Express, 2016Co-Authors: Li Hsien Chou, Yi Cheng Chen, Ping Huang, Rajaboopathi Mani, Chihwei Luo, V Krishnakumar, Takayoshi KobayashiAbstract:We report few-cycle THz pulses emission from a novel organic crystal 2,6-diaminopyridinium-4-Nitrophenolate-4-Nitrophenol (DAP+NP-NP). The observed amplitude of the THz electric field from a DAP+NP-NP crystal is comparable with that from a ZnTe single crystal under the same optical pumping conditions. Both the waveform and spectra of the THz radiation from DAP+NP-NP are similar to those from ZnTe. We conclude that a high quality DAP+NP-NP crystal would be a high potential candidate in THz generation and applications.
Jun Min - One of the best experts on this subject based on the ideXlab platform.
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fabrication of go ag pvdf f127 modified membrane ipa coagulation bath for catalytic reduction of 4 Nitrophenol
Separation and Purification Technology, 2020Co-Authors: Yang Wang, Jun Min, Guie Chen, Jiajun Wan, Lianjing Liu, Yafang Kong, Haifang MaoAbstract:Abstract The silver nanoparticles were prepared in the membrane by employing graphene oxide as a carrier. The structure and properties of GO-Ag/PVDF/F127 modified membrane were regulated by using isopropanol (IPA) as the coagulation bath based on the principle of non-solvent induced phase separation (NIPS) method. The modified membrane prepared by the 50% IPA coagulation bath owned a well-distributed spongy-like pore morphology. Meanwhile, the modified membrane showed excellent hydrophilicity, permeability and optimum mechanical properties. In summary, the membrane MPGOAg-50% possessed the better performance with pure water flux of 87.10 L⋅m−2⋅h−1, the BSA rejection rate of 94.7% and the contact angle of 70°. 4-Nitrophenol (4-NP) was a typical contaminant in the wastewater, its reduction product 4-aminophenol (4-AP) played a vital role in the preparation of some antipyretic and analgesic drugs in the pharmaceutical industry. Therefore, the performance of modified membranes controlled by coagulation bath was investigated by filtration reduction of 4-Nitrophenol. The calculated reaction rate constant was higher than that reported under the same conditions. The modified membrane controlled by the IPA coagulation bath hold a reduction efficiency of 85% and remained stable for at least 1 h.
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Effect of inoculation of Burkholderia sp strain SJ98 on bacterial community dynamics and para-Nitrophenol, 3-methyl-4-Nitrophenol, and 2-chloro-4-Nitrophenol degradation in soil
Scientific reports, 2017Co-Authors: Jun Min, Bin WangAbstract:para-Nitrophenol (PNP), 3-methyl-4-Nitrophenol (3M4NP), and 2-chloro-4-Nitrophenol (2C4NP) are highly toxic compounds that have caused serious environmental issues. We inoculated an artificially contaminated soil with Burkholderia sp. strain SJ98, which has the ability to degrade PNP, 3M4NP, and 2C4NP, and quantified bioremediation. There was accelerated degradation of all Nitrophenols in inoculated treatments compared to the un-inoculated treatments. The indigenous bacteria were able to degrade PNP, but not 3M4NP or 2C4NP. Real-time PCR targeting the catabolic gene pnpA showed that levels of strain SJ98 remained stable over the incubation period. High-throughput sequencing revealed that both contamination and bioaugmentation influenced the bacterial community structure. Bioaugmentation seemed to protect Kineosporia, Nitrososphaera, and Schlesneria from Nitrophenol inhibition, as well as led to a sharp increase in the abundance of Nonomuraea, Kribbella, and Saccharopolyspora. There was a significant increase in the relative abundances of Thermasporomyces, Actinomadura, and Streptomyces in both contaminated and bioaugmented treatments; this indicated that these bacteria are likely directly related to Nitrophenol degradation. To our knowledge, this is the first report of the simultaneous removal of PNP, 3M4NP, and 2C4NP using bioaugmentation. This study provides valuable insights into the bioremediation of soils contaminated with Nitrophenols.
Li Hsien Chou - One of the best experts on this subject based on the ideXlab platform.
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thz emission from organic cocrystalline salt 2 6 diaminopyridinium 4 Nitrophenolate 4 Nitrophenol
Optics Express, 2016Co-Authors: Li Hsien Chou, Yi Cheng Chen, Ping Huang, Rajaboopathi Mani, Chihwei Luo, V Krishnakumar, Takayoshi KobayashiAbstract:We report few-cycle THz pulses emission from a novel organic crystal 2,6-diaminopyridinium-4-Nitrophenolate-4-Nitrophenol (DAP+NP-NP). The observed amplitude of the THz electric field from a DAP+NP-NP crystal is comparable with that from a ZnTe single crystal under the same optical pumping conditions. Both the waveform and spectra of the THz radiation from DAP+NP-NP are similar to those from ZnTe. We conclude that a high quality DAP+NP-NP crystal would be a high potential candidate in THz generation and applications.
