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  1 / 22830 MEDLINE  
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PMID:28934709
Autor:Liu Z; Li X; Tai P; Sun L; Yuan H; Yang X
Endereço:Key Laboratory of Pollution Ecology and Environmental Engineering, Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Título:Toxicity of ammonia, cadmium, and nitrobenzene to four local fishes in the Liao River, China and the derivation of site-specific water quality criteria.
Fonte:Ecotoxicol Environ Saf; 147:656-663, 2018 Jan.
ISSN:1090-2414
País de publicação:Netherlands
Idioma:eng
Resumo:Water quality criteria (WQC) are considered to be an effective management tool for protecting aquatic environments. To derive site-specific WQC for an area, local data based on local species are essential to improve the applicability of WQC derived. Due to the paucity of local fish data available for the development of site-specific WQC for the Liao River, China, four local and widespread fishes (Pseudorasbora parva, Abbottina liaoningensis, Ctenogobius giurinus, and Misgurnus anguillicaudatus) were chosen to test their sensitivities to ammonia, cadmium and nitrobenzene. These compounds are common and regularly-measured pollutants in Chinese rivers. In addition to the published data for species resident in the Liao River, site-specific WQC for the three chemicals were derived using both a log-logistic species sensitivity distribution (SSD) and the method recommended by the USEPA, in line with current best practice, which were then compared with Chinese national WQC. It was found that A. liaoningensis was the most sensitive, followed, in order, by P. parva, C. giurinus and M. anguillicaudatus was the least sensitive, and this trend was the same to all three chemicals tested. When comparing the SSD derived solely from previously-published data with that including our data on local fish, there were significant differences identified among parameters describing the SSD curves for ammonia and nitrobenzene and significant differences were detected for site-specific WQC derived for all of the three chemicals. Based on the dataset with local fish data taxa, site-specific WQC of Liao River for ammonia, cadmium, and nitrobenzene were derived to be 20.53mg/L (at a pH of 7.0 and temperature of 20°C), 3.76µg/L (at a hardness of 100mg/L CaCO ), and 0.49mg/L, respectively. Using the same deriving method for each chemical, the national Chinese WQC were higher than site-specific WQC derived in this study for ammonia (national WQC of 25.16mg/L) and nitrobenzene (national WQC of 0.57mg/L), while the national WQC for cadmium was lower (national WQC of 1.81µg/L). These results indicated that published data can be helpful for use when deriving site-specific WQC but that there were differences between site-specific and national WQC which may lead to either over- or under-protection depending on the pollutant if national WQC were used as the basis for the water management of specific river systems, like the Liao River.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Nitrobenzenes); 0 (Water Pollutants, Chemical); 00BH33GNGH (Cadmium); 7664-41-7 (Ammonia); E57JCN6SSY (nitrobenzene)


  2 / 22830 MEDLINE  
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PMID:29478664
Autor:Xue R; Donovan A; Zhang H; Ma Y; Adams C; Yang J; Hua B; Inniss E; Eichholz T; Shi H
Endereço:Department of Chemistry and Environmental Research Center, Missouri University of Science and Technology, Rolla, MO 65409, USA; Center for Single Nanoparticle, Single Cell, and Single Molecule Monitoring (CS(3)M), Missouri University of Science and Technology, Rolla, MO 65409, USA. Electronic addres
Título:Simultaneous removal of ammonia and N-nitrosamine precursors from high ammonia water by zeolite and powdered activated carbon.
Fonte:J Environ Sci (China); 64:82-91, 2018 Feb.
ISSN:1001-0742
País de publicação:Netherlands
Idioma:eng
Resumo:When adding sufficient chlorine to achieve breakpoint chlorination to source water containing high concentration of ammonia during drinking water treatment, high concentrations of disinfection by-products (DBPs) may form. If N-nitrosamine precursors are present, highly toxic N-nitrosamines, primarily N-nitrosodimethylamine (NDMA), may also form. Removing their precursors before disinfection should be a more effective way to minimize these DBPs formation. In this study, zeolites and activated carbon were examined for ammonia and N-nitrosamine precursor removal when incorporated into drinking water treatment processes. The test results indicate that Mordenite zeolite can remove ammonia and five of seven N-nitrosamine precursors efficiently by single step adsorption test. The practical applicability was evaluated by simulation of typical drinking water treatment processes using six-gang stirring system. The Mordenite zeolite was applied at the steps of lime softening, alum coagulation, and alum coagulation with powdered activated carbon (PAC) sorption. While the lime softening process resulted in poor zeolite performance, alum coagulation did not impact ammonia and N-nitrosamine precursor removal. During alum coagulation, more than 67% ammonia and 70%-100% N-nitrosamine precursors were removed by Mordenite zeolite (except 3-(dimethylaminomethyl)indole (DMAI) and 4-dimethylaminoantipyrine (DMAP)). PAC effectively removed DMAI and DMAP when added during alum coagulation. A combination of the zeolite and PAC selected efficiently removed ammonia and all tested seven N-nitrosamine precursors (dimethylamine (DMA), ethylmethylamine (EMA), diethylamine (DEA), dipropylamine (DPA), trimethylamine (TMA), DMAP, and DMAI) during the alum coagulation process.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Alum Compounds); 0 (Drinking Water); 0 (Nitrosamines); 0 (Water Pollutants, Chemical); 1318-02-1 (Zeolites); 16291-96-6 (Charcoal); 34S289N54E (aluminum sulfate); 7664-41-7 (Ammonia); M43H21IO8R (Dimethylnitrosamine)


  3 / 22830 MEDLINE  
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PMID:29478660
Autor:Li X; Huang Y; Liu HW; Wu C; Bi W; Yuan Y; Liu X
Endereço:School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Título:Simultaneous Fe(III) reduction and ammonia oxidation process in Anammox sludge.
Fonte:J Environ Sci (China); 64:42-50, 2018 Feb.
ISSN:1001-0742
País de publicação:Netherlands
Idioma:eng
Resumo:In recent years, there have been a number of reports on the phenomenon in which ferric iron (Fe(III)) is reduced to ferrous iron [Fe(II)] in anaerobic environments, accompanied by simultaneous oxidation of ammonia to NO , NO , or N However, studies on the relevant reaction characteristics and mechanisms are rare. Recently, in research on the effect of Fe(III) on the activity of Anammox sludge, excess ammonia oxidization has also been found. Hence, in the present study, Fe(III) was used to serve as the electron acceptor instead of NO , and the feasibility and characteristics of Anammox coupled to Fe(III) reduction (termed Feammox) were investigated. After 160days of cultivation, the conversion rate of ammonia in the reactor was above 80%, accompanied by the production of a large amount of NO and a small amount of NO . The total nitrogen removal rate was up to 71.8%. Furthermore, quantities of Fe(II) were detected in the sludge fluorescence in situ hybridization (FISH) and denaturated gradient gel electrophoresis (DGGE) analyses further revealed that in the sludge, some Anammox bacteria were retained, and some microbes were enriched during the acclimatization process. We thus deduced that in Anammox sludge, Fe(III) reduction takes place together with ammonia oxidation to NO and NO along with the Anammox process.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Ferric Compounds); 0 (Oxidants); 0 (Sewage); 7664-41-7 (Ammonia); E1UOL152H7 (Iron); N762921K75 (Nitrogen)


  4 / 22830 MEDLINE  
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PMID:29478653
Autor:Xu X; Liu G; Wang Y; Zhang Y; Wang H; Qi L; Wang H
Endereço:School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China. Electronic address: xxlruc@163.com.
Título:Analysis of key microbial community during the start-up of anaerobic ammonium oxidation process with paddy soil as inoculated sludge.
Fonte:J Environ Sci (China); 64:317-327, 2018 Feb.
ISSN:1001-0742
País de publicação:Netherlands
Idioma:eng
Resumo:A sequencing batch reactor (SBR)-anaerobic ammonium oxidation (anammox) system was started up with the paddy soil as inoculated sludge. The key microbial community structure in the system along with the enrichment time was investigated by using molecular biology methods (e.g., high-throughput 16S rRNA gene sequencing and quantitative PCR). Meanwhile, the influent and effluent water quality was continuously monitored during the whole start-up stage. The results showed that the microbial diversity decreased as the operation time initially and increased afterwards, and the microbial niches in the system were redistributed. The anammox bacterial community structure in the SBR-anammox system shifted during the enrichment, the most dominant anammox bacteria were CandidatusJettenia. The maximum biomass of anammox bacteria achieved 1.68×10 copies/g dry sludge during the enrichment period, and the highest removal rate of TN achieved around 75%.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (RNA, Ribosomal, 16S); 0 (Sewage); 0 (Soil); 7664-41-7 (Ammonia)


  5 / 22830 MEDLINE  
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PMID:29478642
Autor:Ning P; Liu S; Wang C; Li K; Sun X; Tang L; Liu G
Endereço:Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China.
Título:Adsorption-oxidation of hydrogen sulfide on Fe/walnut-shell activated carbon surface modified by NH -plasma.
Fonte:J Environ Sci (China); 64:216-226, 2018 Feb.
ISSN:1001-0742
País de publicação:Netherlands
Idioma:eng
Resumo:Walnut-shell activated carbon (WSAC) supported ferric oxide was modified by non-thermal plasma (NTP), and the removal efficiency for hydrogen sulfide over Fe/WSAC modified by dielectric barrier discharge (DBD) was significantly promoted. The sample modified for 10min and 6.8kV output (30V input voltage) maintained 100% H S conversion over a long reaction time of 390min. The surface properties of adsorbents modified by NTP under different conditions were evaluated by the methods of X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) analysis and in-situ Fourier transform infrared spectroscopy (FTIR), to help understand the effect of the NTP treatment. NTP treatment enhanced the adsorption capacity of Fe/WSAC, which could due to the formation of micro-pores with sizes of 0.4, 0.5 and 0.75nm. XPS revealed that chemisorbed oxygen changed into lattice oxygen after NTP treatment, and lattice oxygen is beneficial for H S oxidation. From the in-situ FTIR result, transformation of the reaction path on Fe/WSAC was observed after NTP modification. The research results indicate that NTP is an effective method to improve the surface properties of the Fe/WSAC catalyst for H S adsorption-oxidation.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Plasma Gases); 16291-96-6 (Charcoal); 7664-41-7 (Ammonia); E1UOL152H7 (Iron); YY9FVM7NSN (Hydrogen Sulfide)


  6 / 22830 MEDLINE  
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PMID:29472470
Autor:Broere DLJ; Holland PL
Endereço:Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, Netherlands. d.l.j.broere@uu.nl patrick.holland@yale.edu.
Título:Boron compounds tackle dinitrogen.
Fonte:Science; 359(6378):871, 2018 02 23.
ISSN:1095-9203
País de publicação:United States
Idioma:eng
Tipo de publicação: JOURNAL ARTICLE; COMMENT
Nome de substância:0 (Boron Compounds); 7664-41-7 (Ammonia); 81AH48963U (Molybdenum); N9E3X5056Q (Boron)


  7 / 22830 MEDLINE  
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PMID:28741730
Autor:Yin G; Bai C; Sun J; Sun L; Xue Y; Zhang Y; Zhao H; Yu Z; Liu S; Zhang K
Endereço:Inner Mongolia Academy of Agriculture and Animal Husbandry Science, Hohhot, China.
Título:Fermentation quality and nutritive value of total mixed ration silages based on desert wormwood (Artemisia desertorum Spreng.) combining with early stage corn.
Fonte:Anim Sci J; 88(12):1963-1969, 2017 Dec.
ISSN:1740-0929
País de publicação:Australia
Idioma:eng
Resumo:This study aimed to investigate the fermentation quality and nutritive value of total mixed ration (TMR) silages based on desert wormwood (DW) combined with early stage corn (ESC) as forage and determine an optimum formula. Desert wormwood and ESC were harvested, chopped, and mixed with other ingredients according to a formula, packed into laboratory silos at densities of 500-550 g/L, and stored in the dark for 60 days. The DW proportions in the forage of TMR were 1, 0.75, 0.50, 0.25 and 0, based on fresh weight. As the proportion of DW decreased, the pH also decreased (P < 0.05), while lactic acid, lactic acid/acetic acid, crude protein, starch, and the in vitro digestibility of dry matter and neutral detergent fiber increased (P < 0.05). Ammonia nitrogen/total nitrogen in the TMR silages with DW proportions of 0.75, 0.25 and 0 in the forage was more than 10%. These results indicated that the quality of the TMR silage containing DW alone as forage was poor, TMR silages containing DW proportions of 0.75 and 0.25, and ESC alone, in the forage were not well preserved. The optimum TMR silage formula contained a DW proportion of 0.5 in the forage.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Acetates); 0 (Proteins); 33X04XA5AT (Lactic Acid); 7664-41-7 (Ammonia); 9005-25-8 (Starch); N762921K75 (Nitrogen)


  8 / 22830 MEDLINE  
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PMID:29111498
Autor:Malek R; Bonnarme P; Irlinger F; Frey-Klett P; Onésime D; Aubert J; Loux V; Beckerich JM
Endereço:UMR 1319 MICALIS, INRA, AgroParisTech, CBAI, BP01, 78850 Thiverval Grignon, France. Electronic address: reinemalek@hotmail.com.
Título:Transcriptomic response of Debaryomyces hansenii during mixed culture in a liquid model cheese medium with Yarrowia lipolytica.
Fonte:Int J Food Microbiol; 264:53-62, 2018 Jan 02.
ISSN:1879-3460
País de publicação:Netherlands
Idioma:eng
Resumo:Yeasts play a crucial role in cheese ripening. They contribute to the curd deacidification, the establishment of acid-sensitive bacterial communities, and flavour compounds production via proteolysis and catabolism of amino acids (AA). Negative yeast-yeast interaction was observed between the yeast Yarrowia lipolytica 1E07 (YL1E07) and the yeast Debaryomyces hansenii 1L25 (DH1L25) in a model cheese but need elucidation. YL1E07 and DH1L25 were cultivated in mono and co-cultures in a liquid synthetic medium (SM) mimicking the cheese environment and the growth inhibition of DH1L25 in the presence of YL1E07 was reproduced. We carried out microbiological, biochemical (lactose, lactate, AA consumption and ammonia production) and transcriptomic analyses by microarray technology to highlight the interaction mechanisms. We showed that the DH1L25 growth inhibition in the presence of YL1E07 was neither due to the ammonia production nor to the nutritional competition for the medium carbon sources between the two yeasts. The transcriptomic study was the key toward the comprehension of yeast-yeast interaction, and revealed that the inhibition of DH1L25 in co-culture is due to a decrease of the mitochondrial respiratory chain functioning.
Tipo de publicação: JOURNAL ARTICLE
Nome de substância:0 (Amino Acids); 0 (Flavoring Agents); 33X04XA5AT (Lactic Acid); 7664-41-7 (Ammonia); J2B2A4N98G (Lactose)


  9 / 22830 MEDLINE  
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PMID:29311556
Autor:Springsteen G; Yerabolu JR; Nelson J; Rhea CJ; Krishnamurthy R
Endereço:Department of Chemistry, Furman University, Greenville, SC, 29613, USA.
Título:Linked cycles of oxidative decarboxylation of glyoxylate as protometabolic analogs of the citric acid cycle.
Fonte:Nat Commun; 9(1):91, 2018 01 08.
ISSN:2041-1723
País de publicação:England
Idioma:eng
Resumo:The development of metabolic approaches towards understanding the origins of life, which have focused mainly on the citric acid (TCA) cycle, have languished-primarily due to a lack of experimentally demonstrable and sustainable cycle(s) of reactions. We show here the existence of a protometabolic analog of the TCA involving two linked cycles, which convert glyoxylate into CO and produce aspartic acid in the presence of ammonia. The reactions proceed from either pyruvate, oxaloacetate or malonate in the presence of glyoxylate as the carbon source and hydrogen peroxide as the oxidant under neutral aqueous conditions and at mild temperatures. The reaction pathway demonstrates turnover under controlled conditions. These results indicate that simpler versions of metabolic cycles could have emerged under potential prebiotic conditions, laying the foundation for the appearance of more sophisticated metabolic pathways once control by (polymeric) catalysts became available.
Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
Nome de substância:0 (Glyoxylates); 0 (Malonates); 142M471B3J (Carbon Dioxide); 2F399MM81J (Oxaloacetic Acid); 30KYC7MIAI (Aspartic Acid); 7664-41-7 (Ammonia); 8558G7RUTR (Pyruvic Acid); 9KX7ZMG0MK (malonic acid); BBX060AN9V (Hydrogen Peroxide); JQ39C92HH6 (glyoxylic acid)


  10 / 22830 MEDLINE  
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PMID:29251473
Autor:Dong L; Meng Y; Wang J; Sun G
Título:Effects of Transgenic Bt+CpTI cotton on the abundance and diversity of rhizosphere ammonia oxidizing bacteria and archaea.
Fonte:J Environ Biol; 37(5):881-8, 2016 09.
ISSN:0254-8704
País de publicação:India
Idioma:eng
Resumo:Genetically modified crops (GMCs) hold great promise for improving agricultural output, but at the same time present challenges in terms of environmental safety assessment. Ammonia oxidizers, including ammonia oxidizing bacteria (AOB) and archaea (AOA), are very important functional microbial groups in nitrogen cycle. The abundance and diversity of AOA and AOB in the rhizosphere of genetically modified cotton (SGK321) and non-GM cotton (SY321) across growth stages were investigated using real time quantitative PCR (qPCR) and terminal restriction fragment length polymorphism (T-RFLP). Results showed that cotton genotype had a significant effect on the change in abundance of AOA and AOB, as indicated by amoA copy number. Variations in AOB abundance in rhizosphere of SY321 differed from those in SGK321. The number of AOB in the rhizosphere of SY321 fluctuated considerably: It dramatically decreased from 1.2?106 copies g-1 dry soil to 3?105 copies g-1 dry soil during the flowering stage and then increased to 1.1?106 copies g-1 and 1.5?106 copies g-1 at the belling and boll opening stages, respectively. However, abundance of AOB in the rhizosphere of SGK321 was relatively stable during all the stages of growth. The effect of SGK321 and SY321 on AOA number was quite similar to that of AOB: AOA abundance in SGK321 increased smoothly from 1.0 ?105 copies g-1 dry soil to 1.4?106 copies g-1 dry soil during growth, but that in SY321 fluctuated. Correspondence analysis (CA), canonical CA (CCA), and partial CCA (pCCA) of T-RFLP profiles of AOA and AOB showed that AOB community changed across growth stages in both cotton genotypes, and cotton genotype was the most important factor affecting the AOA community. In conclusion, the current findings indicated no adverse effect of GM cotton on functional microorganisms.
Tipo de publicação: RESEARCH SUPPORT, NON-U.S. GOV'T; JOURNAL ARTICLE
Nome de substância:0 (DNA, Archaeal); 0 (DNA, Bacterial); 0 (Soil); 7664-41-7 (Ammonia)



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