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Journal articles on the topic 'Metal nitrene species'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Balicka, Adrianna, and Jan Szadkowski. "Analysis of adsorption of heavy metals from water solutions by wood of selected domestic species using X-Ray Fluorescence (XRF)." Annals of WULS, Forestry and Wood Technology 111 (September 30, 2020): 73–82. http://dx.doi.org/10.5604/01.3001.0014.6773.

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Analysis of adsorption of heavy metals from water solutions by wood of selected domestic species using X-Ray Fluorescence (XRF).The aim of this study was to analyze the absorption of three specific heavy metals from model water solution by wood species from domestic Polish forests. This paper focuses on XRF method to determine metal content in samples. European aspen (Populus tremula L.) and Black locust (Robinia pseudoacacia L.) have been chosen. Firstly, shavings were prepared and soaked with standard solutions of lead (II) nitrate, cadmium nitrate and mercury (II) chloride for 7 days. Then,

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2

Bahadori, Elnaz, Francesco Conte, Antonio Tripodi, Gianguido Ramis, and Ilenia Rossetti. "Photocatalytic Selective Oxidation of Ammonia in a Semi-Batch Reactor: Unravelling the Effect of Reaction Conditions and Metal Co-Catalysts." Catalysts 11, no. 2 (2021): 209. http://dx.doi.org/10.3390/catal11020209.

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Photocatalysis has been used for the oxidation of ammonia/ammonium in water. A semibatch photoreactor was developed for this purpose, and nanostructured TiO2-based materials, either commercial P25 or prepared by flame spray pyrolysis (FSP), were used as catalysts. In the present work, we investigated the effect of (i) metal co-catalysts, (ii) pH, and (iii) ammonia concentration on the efficiency of oxidation and on the selectivity to the undesired overoxidation byproduct, i.e., nitrites and nitrates. Several metals were added to both titania samples, and the physicochemical properties of every

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3

Papuc, Camelia, Corina Predescu, Valentin Nicorescu, Georgeta Stefan, and Isabela Nicorescu. "Antioxidant Properties of a Parsley (Petroselinum crispum) Juice Rich in Polyphenols and Nitrites." Current Research in Nutrition and Food Science Journal 4, Special-Issue-October (2016): 114–18. http://dx.doi.org/10.12944/crnfsj.4.special-issue-october.15.

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Parsley (Petroselinum crispum) is an herbaceous vegetable used as foodstuff, spice and medicinal plant because it provides antioxidants especially flavonoids (apigenin), vitamins (K, C and A), and volatile oils, among other compounds. Because parsley has important concentrations of nitrates and flavonoids, very little vegetal pigment and a mild flavour profile, it was chosen for this study. The aim of this study was to obtain parsley juice rich in nitrite and polyphenols and to assess its antioxidant activity. To obtain nitrite from nitrate by enzymatic reaction, Staphylococcus xylosus ATCC 29

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Kodentsov, Alexander. "Diffusion-Limited Reactions of Non-Oxide Ceramics with Transition Metals." Diffusion Foundations 21 (March 2019): 85–126. http://dx.doi.org/10.4028/www.scientific.net/df.21.85.

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Thermodynamic and diffusion models are given to describe morphological evolution of the reaction zone during diffusion-limited interaction between non-oxide Si-containing ceramics (SiC and Si3N4) and transition metals (Cr, Mo, Ti, Ni, Co, Pt). In the case of diffusion-controlled process in the ternary metal-ceramic systems, reaction phenomena can be rationalized using chemical potential diagrams. However, in some cases, a periodic layered morphology is found in the transition zone, which is not fully understood, and it is difficult to predict a priori. Silicide formation in systems based on de

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5

Jasman, Siti Maryam, Hendrik Oktendy Lintang, Siew Ling Lee, and Leny Yuliati. "Photocatalytic oxidation of nitrite ion over carbon nitride." Malaysian Journal of Fundamental and Applied Sciences 14, no. 1-2 (2018): 174–78. http://dx.doi.org/10.11113/mjfas.v14n1-2.987.

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Nitrite ion (NO2-) is a toxic inorganic contaminant, which is widely used in industry and agriculture as a food preservative and a fertilizing agent. One of the methods to reduce the toxicity of the NO2- is by oxidizing it into less hazardous compounds, such as nitrate ion (NO3-). In this study, we demonstrated that a simple and green photocatalytic process can be employed to oxidize the NO2- to NO3- over a metal free-carbon nitride photocatalyst under ultraviolet (UV) light irradiation. The carbon nitride was synthesized via pyrolysis of urea precursor by a thermal polymerization process at 8

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6

Percival, H. J., T. W. Speir, and A. Parshotam. "Soil solution chemistry of contrasting soils amended with heavy metals." Soil Research 37, no. 5 (1999): 993. http://dx.doi.org/10.1071/sr98055.

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The soil solution chemistry of heavy metal amended soils is of great importance in assessing the bioavailability of heavy metals and their toxicity to the soil biota. Three contrasting soils were amended with Cd(II), Cu(II), Ni(II), Pb(II), Zn(II), and Cr(III) nitrate salts at rates of 10–100 mmol/kg. This concentration range was chosen to encompass a wide range of effects on sensitive soil biochemical properties as part of a larger project. Soil solutions were extracted and analysed for pH, and for concentrations of heavy metals, and major cations and anions. Heavy metal speciation was calcul

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7

Lebel, Hélène, and Henri Piras. "Stereoselective Synthesis of Chiral Sulfilimines from N-Mesyloxycarbamates: Metal-Nitrenes versus Metal-Nitrenoids Species." Journal of Organic Chemistry 80, no. 7 (2015): 3572–85. http://dx.doi.org/10.1021/acs.joc.5b00256.

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8

Starkenburg, Shawn R., Frank W. Larimer, Lisa Y. Stein, et al. "Complete Genome Sequence of Nitrobacter hamburgensis X14 and Comparative Genomic Analysis of Species within the Genus Nitrobacter." Applied and Environmental Microbiology 74, no. 9 (2008): 2852–63. http://dx.doi.org/10.1128/aem.02311-07.

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ABSTRACT The alphaproteobacterium Nitrobacter hamburgensis X14 is a gram-negative facultative chemolithoautotroph that conserves energy from the oxidation of nitrite to nitrate. Sequencing and analysis of the Nitrobacter hamburgensis X14 genome revealed four replicons comprised of one chromosome (4.4 Mbp) and three plasmids (294, 188, and 121 kbp). Over 20% of the genome is composed of pseudogenes and paralogs. Whole-genome comparisons were conducted between N. hamburgensis and the finished and draft genome sequences of Nitrobacter winogradskyi and Nitrobacter sp. strain Nb-311A, respectively.

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9

Yu, Guo Xian, Ji Bing Li, Xiao Long Zhou, Cheng Lie Li, Li Fang Chen, and Jin An Wang. "Adsorption of Dibenzothiophene on Transition Metals Loaded Activated Carbon." Advanced Materials Research 132 (August 2010): 141–48. http://dx.doi.org/10.4028/www.scientific.net/amr.132.141.

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Transition metal-modified carbon-based adsorbents were prepared by impregnating activated carbon with solutions of copper, cobalt or nickel chloride or nitrate. The mixtures were dried and then calcined under nitrogen stream. The surface metal species were analyzed by XRD technique and the surface oxygen-containing groups were characterized by FTIR. Their adsorption capacities for dibenzothiophene (DBT) were measured by using DBT-containing n-octane solution as model oil. Experimental results show that the metal species on the carbon surface could be controlled by the calcination process under

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10

Yoshie, S., N. Noda, T. Miyano, S. Tsuneda, A. Hirata, and Y. Inamori. "Characterization of microbial community in nitrogen removal process of metallurgic wastewater by PCR-DGGE." Water Science and Technology 46, no. 11-12 (2002): 93–98. http://dx.doi.org/10.2166/wst.2002.0722.

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The metallurgic wastewater generated from the processes of recovering precious metals from industrial wastes contains high concentrations of nitrogen compounds such as ammonia and nitric acid and of salts such as sodium chloride and sodium sulfate. Biological nitrogen removal from this wastewater was attempted by a circulating bioreactor system equipped with an anoxic packed bed and an aerobic fluidized bed. The anoxic packed bed of this system was found to effectively remove nitrite and nitrate from the wastewater by denitrification at a removal ratio of 97%. As a result of denitrification ac

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11

Green, Stefan J., Om Prakash, Thomas M. Gihring, et al. "Denitrifying Bacteria Isolated from Terrestrial Subsurface Sediments Exposed to Mixed-Waste Contamination." Applied and Environmental Microbiology 76, no. 10 (2010): 3244–54. http://dx.doi.org/10.1128/aem.03069-09.

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ABSTRACTIn terrestrial subsurface environments where nitrate is a critical groundwater contaminant, few cultivated representatives are available to verify the metabolism of organisms that catalyze denitrification. In this study, five species of denitrifying bacteria from three phyla were isolated from subsurface sediments exposed to metal radionuclide and nitrate contamination as part of the U.S. Department of Energy's Oak Ridge Integrated Field Research Challenge (OR-IFRC). Isolates belonged to the generaAfipiaandHyphomicrobium(Alphaproteobacteria),Rhodanobacter(Gammaproteobacteria),Intraspor

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12

Li, Yan, Tianyu Tang, Haejune Lee, and Kiwon Song. "Cold Atmospheric Pressure Plasma-Activated Medium Induces Selective Cell Death in Human Hepatocellular Carcinoma Cells Independently of Singlet Oxygen, Hydrogen Peroxide, Nitric Oxide and Nitrite/Nitrate." International Journal of Molecular Sciences 22, no. 11 (2021): 5548. http://dx.doi.org/10.3390/ijms22115548.

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Cold atmospheric pressure plasma (CAP) and plasma-activated medium (PAM) induce cell death in diverse cancer cells and may function as powerful anti-cancer agents. The main components responsible for the selective anti-cancer effects of CAP and PAM remain elusive. CAP or PAM induces selective cell death in hepatocellular carcinoma cell lines Hep3B and Huh7 containing populations with cancer stem cell markers. Here, we investigated the major component(s) of CAP and PAM for mediating the selective anti-proliferative effect on Hep3B and Huh7 cells. The anti-proliferative effect of CAP was mediate

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13

Lebel, Helene, and Henri Piras. "ChemInform Abstract: Stereoselective Synthesis of Chiral Sulfilimines from N-Mesyloxycarbamates: Metal-Nitrenes versus Metal-Nitrenoids Species." ChemInform 46, no. 33 (2015): no. http://dx.doi.org/10.1002/chin.201533118.

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14

Livingstone, Keith, Sophie Bertrand, Jenna Mowat, and Craig Jamieson. "Metal-free C–C bond formation via coupling of nitrile imines and boronic acids." Chemical Science 10, no. 44 (2019): 10412–16. http://dx.doi.org/10.1039/c9sc03032h.

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15

Janke, H., TM Yamada, DAS Beraldo, CMR Botta, MRL Nascimento, and AA Mozeto. "Assessment of the acute toxicity of eutrophic sediments after the addition of calcium nitrate (Ibirité reservoir, Minas Gerais-SE Brazil): initial laboratory experiments." Brazilian Journal of Biology 71, no. 4 (2011): 903–14. http://dx.doi.org/10.1590/s1519-69842011000500011.

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This study evaluated the acute toxicity of sediment in a eutrophic reservoir after remediation with a calcium nitrate solution to retain phosphorus. The study involved microcosms of surface sediments and water from the sediment-water interface in the Ibirité reservoir. This reservoir, located in the vicinity of metropolitan Belo Horizonte (Minas Gerais, SE Brazil), is a water body that receives treated effluents from an oil refinery (REGAP-Petrobras), as well as high loads of untreated urban effluents from the city of Ibirité and surrounding areas and industrial effluents from a major industri

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16

Ding, Dewu, Meineng Wang, Meili Wu, Chengzhi Gan, and Pu Wu. "Condition-Specific Molecular Network Analysis Revealed That Flagellar Proteins Are Involved in Electron Transfer Processes of Shewanella piezotolerans WP3." Genetics Research 2021 (July 29, 2021): 1–9. http://dx.doi.org/10.1155/2021/9953783.

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Because of the ability to metabolize a large number of electron acceptors such as nitrate, nitrite, fumarate, and metal oxides, Shewanella species have attracted much attention in recent years. Generally, the use of these electron acceptors is mainly achieved through electron transfer proteins and their interactions which will dynamically change across different environmental conditions in cells. Therefore, functional analysis of condition-specific molecular networks can reveal biological information on electron transfer processes. By integrating expression data and molecular networks, we cons

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17

Rader, W. Scott, Ljiljana Solujic, E. B. Milosavljevic, J. L. Hendrix, and J. H. Nelson. "Photochemistry of Aqueous Solutions of Dicyanomercury(II) and Potassium Tetracyanomercurate(II)." Journal of Solar Energy Engineering 116, no. 3 (1994): 125–29. http://dx.doi.org/10.1115/1.2930070.

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Photochemically induced reactions of dicyanomercury(II) and potassium tetracyanomercurate(II) in alkaline aqueous solutions were investigated in detail. The studies were conducted in the presence or absence of a titanium(IV) oxide semiconductor photocatalyst utilizing sunlight as the irradiation source. It was established that the cyanide ion liberated from the thermodynamically stable mercury-cyano species can be photocatalytically oxidized via cyanate and nitrite to nitrate. In addition, the process removes over 99 mol% of mercury from the solution. In the absence of the photocatalyst, no ph

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18

Chen, Zupeng, Evgeniya Vorobyeva, Sharon Mitchell, et al. "Single-atom heterogeneous catalysts based on distinct carbon nitride scaffolds." National Science Review 5, no. 5 (2018): 642–52. http://dx.doi.org/10.1093/nsr/nwy048.

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Abstract Carbon nitrides integrating macroheterocycles offer unique potential as hosts for stabilizing metal atoms due to their rich electronic structure. To date, only graphitic heptazine-based polymers have been studied. Here, we demonstrate that palladium atoms can be effectively isolated on other carbon nitride scaffolds including linear melem oligomers and poly(triazine/heptazine imides). Increased metal uptake was linked to the larger cavity size and the presence of chloride ions in the polyimide structures. Changing the host structure leads to significant variation in the average oxidat

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19

Pawlowska, Teresa E., Rufus L. Chaney, Mel Chin, and Iris Charvat. "Effects of Metal Phytoextraction Practices on the Indigenous Community of Arbuscular Mycorrhizal Fungi at a Metal-Contaminated Landfill." Applied and Environmental Microbiology 66, no. 6 (2000): 2526–30. http://dx.doi.org/10.1128/aem.66.6.2526-2530.2000.

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ABSTRACT Phytoextraction involves use of plants to remove toxic metals from soil. We examined the effects of phytoextraction practices with three plant species (Silene vulgaris, Thlaspi caerulescens, and Zea mays) and a factorial variation of soil amendments (either an ammonium or nitrate source of nitrogen and the presence or absence of an elemental sulfur supplement) on arbuscular mycorrhizal (AM) fungi (Glomales, Zygomycetes) at a moderately metal-contaminated landfill located in St. Paul, Minn. Specifically, we tested whether the applied treatments affected the density of glomalean spores

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20

Kim, Kwang-Soo, Ji-Seon Yoo, Sungyoun Kim, Hee Ja Lee, Kwang-Ho Ahn, and In S. Kim. "Relationship between the electric conductivity and phosphorus concentration variations in an enhanced biological nutrient removal process." Water Science and Technology 55, no. 1-2 (2007): 203–8. http://dx.doi.org/10.2166/wst.2007.053.

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Phosphorus release and uptake in a sequencing batch reactor were monitored by the simple on-line measurements of electric conductivity (EC) and oxidation-reduction potential (ORP), and the result was verified by the measurement of phosphate concentration changes. The influence of nitrate ion presence on the phosphorus removal was evaluated by a jar test operated in the cyclic anaerobic (anoxic)–aerobic condition. The relationships of EC, ORP and metal species with phosphorus concentrations were investigated. Under strict anaerobic conditions, EC showed positive correlation with phosphorus conc

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21

Prakash, Om, Stefan J. Green, Puja Jasrotia, et al. "Rhodanobacter denitrificans sp. nov., isolated from nitrate-rich zones of a contaminated aquifer." International Journal of Systematic and Evolutionary Microbiology 62, Pt_10 (2012): 2457–62. http://dx.doi.org/10.1099/ijs.0.035840-0.

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Bacterial strains 2APBS1T and 116-2 were isolated from the subsurface of a nuclear legacy waste site where the sediments are co-contaminated with large amounts of acids, nitrate, metal radionuclides and other heavy metals. A combination of physiological and genetic assays indicated that these strains represent the first member of the genus Rhodanobacter shown to be capable of complete denitrification. Cells of strain 2APBS1T and 116-2 were Gram-negative, non-spore-forming rods, 3–5 µm long and 0.25–0.5 µm in diameter. The isolates were facultative anaerobes, and had temperature and pH optima f

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22

Chohan, Zahid H., and S. K. A. Sherazi. "Synthesis, Characterization and Role of Anions (Nitrate, Sulphate, Oxalate and Acetate) \in the Biological Activity of Hydrazine Derived Compounds and Their Metal Chelates." Metal-Based Drugs 4, no. 6 (1997): 327–32. http://dx.doi.org/10.1155/mbd.1997.327.

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Hydrazine derived compounds and its Co(II), Cu(II) and Ni(II) chelates having the same metal ion but different anions (e.g., nitrate, sulphate, oxalate and acetate) have been synthesised and characterised by their physical, spectral and analytical data. In order to evaluate the participating role of anions in the antibacterial activity, these synthesised ligands and its metal chelates have been screened against bacterial species such as Staphylococcus aureous, pseudomonas aeruginosa, Klebsiella pneumonae and Proteus vulgarus, and the results are reported.

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23

Yang, Xiaoyun, Sina He, Yijin Shu, et al. "Controlled nitridation of tantalum (oxy)nitride nanoparticles towards optimized metal-support interactions with gold nanocatalysts." RSC Advances 5, no. 108 (2015): 89282–89. http://dx.doi.org/10.1039/c5ra19644b.

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Optimized metal-support interactions were achieved on ionothermally prepared tantalum (oxy)nitrides with controlled nitridation, and the as-formed Auδ<sup>−</sup> species on TaON is efficient for nitrobenzene hydrogenation.

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24

Macdonald, Katrina M., Sangeeta Sharma, Desiree Toom, et al. "Temporally delineated sources of major chemical species in high Arctic snow." Atmospheric Chemistry and Physics 18, no. 5 (2018): 3485–503. http://dx.doi.org/10.5194/acp-18-3485-2018.

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Abstract. Long-range transport of aerosol from lower latitudes to the high Arctic may be a significant contributor to climate forcing in the Arctic. To identify the sources of key contaminants entering the Canadian High Arctic an intensive campaign of snow sampling was completed at Alert, Nunavut, from September 2014 to June 2015. Fresh snow samples collected every few days were analyzed for black carbon, major ions, and metals, and this rich data set provided an opportunity for a temporally refined source apportionment of snow composition via positive matrix factorization (PMF) in conjunction

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25

Chohan, Zahid H. "Biologically Active Transition Metal Chelates of Ni(II), Cu(II) and Zn(II) With 2-Aminothiazole-Derived Schiff-bases: Their Synthesis, Characterization and the Role of Anions (NO3 , SO42− , C2O42- and CH3CO2− ) on Their Antibacterial Properties." Metal-Based Drugs 6, no. 3 (1999): 187–92. http://dx.doi.org/10.1155/mbd.1999.187.

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Biologically active nickel(ll), copper(ll) and zinc(ll) chelates with thiazole-derived nitro- and chlorosalicylaldehyde Schiff-bases having the same metal ion but different anions, e.g. nitrate, sulfate, oxalate and acetate have been synthesized and characterized on the basis of their physical, spectral and analytical data. In order to evaluate the possible participating role of anions on the antibacterial properties, these ligands and their synthesized metal chelates with various anions have been screened against bacterial species Escherichia coli, Pseudomonas aeruginosa and Staphylococcus au

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26

THAMAE, MAMOTHIBE A., and TEBELLO NYOKONG. "Spectroscopic studies of the interaction of cobalt(II) N,N',N″,N‴-tetramethyltetra-3,4-pyridinoporphyrazine with amino acids and nitrogen oxides." Journal of Porphyrins and Phthalocyanines 05, no. 12 (2001): 839–45. http://dx.doi.org/10.1002/jpp.551.

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The interaction of histidine, cysteine, NO and nitrite with cobalt(II) N,N',N″,N‴-tetramethyltetra-3,4-tetrapyridinoporphyrazine ([ Co II tmtppa ]4+) is reported. Metal-based autoreduction of [ Co II tmtppa ]4+ occurs with the formation of the [ Co I tmtppa (-2)]3+ species in the presence of histidine and cysteine. Kinetic data for the auto reduction of [ Co II tmtppa ]4+ in the presence of these amino acids gave the rate constants k f = 2.1 × 101 and 2.8 dm3 mol-1 s-1, for cysteine and histidine, respectively. One molecule of NO or nitrite was found to coordinate to the [ Co II tmtppa ]4+ spe

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27

Sinha, S. K., H. S. Srivastava, and S. N. Mishra. "Effect of lead on nitrate reductase activity and nitrate assimilation in pea leaves." Acta Societatis Botanicorum Poloniae 57, no. 4 (2014): 457–63. http://dx.doi.org/10.5586/asbp.1988.043.

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The effect of Pb on nitrate reductase activity, protein, total organic nitrogen and on the chlorophyll content in excised and intact leaf tissues of <em>Pisum sativum</em> was examine. Enzyme activity assayed in vitro or in vivo in the excised leaves showed marked increase at lower concentrations of Pb while being inhibited at higher concentrations. In intact leaf tissues, the enzyme activity (in vivo or in vitro) was unaffected at lower concentrations but was inhibited at higher concentrations of Pb. Chlorophyll, carotenoids (non-nitrogenous pigments), soluble protein and organic

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28

Kalčíková, Gabriela, Jana Zagorc-Končan, and Andreja Žgajnar Gotvajn. "Artemia salina acute immobilization test: a possible tool for aquatic ecotoxicity assessment." Water Science and Technology 66, no. 4 (2012): 903–8. http://dx.doi.org/10.2166/wst.2012.271.

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Despite the fact that the marine crustacean Artemia salina is extensively used in ecotoxicology, there is still a lack of information about its sensitivity to commonly used chemicals. In the presented study, acute toxicity of 18 commonly used chemicals – including organic solvents, industrial chemicals, metals and inorganic compounds – to A. salina was evaluated. A. salina showed a range of sensitivities to tested chemicals. Regarding all of the investigated organics, phenolic compounds expressed the highest toxicity to A. salina. Nitrite and mercury were the most toxic inorganic substances ap

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Wattanathana, Worawat, Suttipong Wannapaiboon, Chatchai Veranitisagul, Navadol Laosiripojana, Nattamon Koonsaeng, and Apirat Laobuthee. "Preparation of Palladium-Impregnated Ceria by Metal Complex Decomposition for Methane Steam Reforming Catalysis." Advances in Materials Science and Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/5828067.

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Palladium-impregnated ceria materials were successfully prepared via an integrated procedure between a metal complex decomposition method and a microwave-assisted wetness impregnation. Firstly, ceria (CeO2) powders were synthesized by thermal decomposition of cerium(III) complexes prepared by using cerium(III) nitrate or cerium(III) chloride as a metal source to form a metal complex precursor with triethanolamine or benzoxazine dimer as an organic ligand. Palladium(II) nitrate was consequently introduced to the preformed ceria materials using wetness impregnation while applying microwave irrad

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30

North, Nadia N., Sherry L. Dollhopf, Lainie Petrie, Jonathan D. Istok, David L. Balkwill, and Joel E. Kostka. "Change in Bacterial Community Structure during In Situ Biostimulation of Subsurface Sediment Cocontaminated with Uranium and Nitrate." Applied and Environmental Microbiology 70, no. 8 (2004): 4911–20. http://dx.doi.org/10.1128/aem.70.8.4911-4920.2004.

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ABSTRACT Previous studies have demonstrated that metal-reducing microorganisms can effectively promote the precipitation and removal of uranium from contaminated groundwater. Microbial communities were stimulated in the acidic subsurface by pH neutralization and addition of an electron donor to wells. In single-well push-pull tests at a number of treated sites, nitrate, Fe(III), and uranium were extensively reduced and electron donors (glucose, ethanol) were consumed. Examination of sediment chemistry in cores sampled immediately adjacent to treated wells 3.5 months after treatment revealed th

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31

Chohan, Zahid H., and M. Praveen. "Biological Role of Anions (Sulfate, Nitrate , Oxalate and Acetate) on the Antibacterial Properties of Cobalt (II) and Nickel(II) Complexes With Pyrazinedicarboxaimide Derived, Furanyl and Thienyl Compounds." Metal-Based Drugs 6, no. 2 (1999): 95–99. http://dx.doi.org/10.1155/mbd.1999.95.

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A number of biologically active complexes of cobalt(II) and nickel(II) with pyrazinedicarboxaimido derived thienyl and furanyl compounds having the same metal ion but different anions such as sulphate, nitrate, oxalate and acetate have been synthesized and characterized on the basis of their physical, spectral and analytical data. In order to evaluate the role of anions on their antibacterial properties, these ligands and their synthesized metal complexes with various anions have been screened against bacterial species Escherichia coil,Pseudomonas aeruginosa and Staphylococcus aureus. The titl

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Kroll, Kristin, Vera Pähtz, Falk Hillmann, et al. "Identification of Hypoxia-Inducible Target Genes of Aspergillus fumigatus by Transcriptome Analysis Reveals Cellular Respiration as an Important Contributor to Hypoxic Survival." Eukaryotic Cell 13, no. 9 (2014): 1241–53. http://dx.doi.org/10.1128/ec.00084-14.

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ABSTRACT Aspergillus fumigatus is an opportunistic, airborne pathogen that causes invasive aspergillosis in immunocompromised patients. During the infection process, A. fumigatus is challenged by hypoxic microenvironments occurring in inflammatory, necrotic tissue. To gain further insights into the adaptation mechanism, A. fumigatus was cultivated in an oxygen-controlled chemostat under hypoxic and normoxic conditions. Transcriptome analysis revealed a significant increase in transcripts associated with cell wall polysaccharide metabolism, amino acid and metal ion transport, nitrogen metabolis

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33

Lyhatskyi, P. H., L. S. Fira, D. B. Fira, and I. P. Kuzmak. "Molecular mechanisms of metabolic disorders in the organs of rats of different ages affected by sodium nitrite in the context of tobacco intoxication." Regulatory Mechanisms in Biosystems 8, no. 2 (2017): 259–64. http://dx.doi.org/10.15421/021740.

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Among pollutants a significant threat is posed by heavy metals, nitrate fertilizers and industrial waste. However, people also contribute to this threat through bad habits such as smoking and alcohol. All these factors affect health and can cause death. The aim of this study was to investigate the content of reactive oxygen species, markers of cytolysis of hepatocytes, cardoza and the degree of endogenous intoxication in the organism of rats affected by nitrite of sodium on the background of tobacco intoxication. The experiments were carried out on white rats, which were divided into three age

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Chohan, Zahid Hussain, and Abdur Rauf. "Pharmacological Role of Anions (Sulphate, Nitrate, Oxalate and Acetate) on the Antibacterial Activity of Cobalt(II), Copper(II) and Nickel(II) Complexes With Nicotinoylhydrazine-Derived ONO, NNO and SNO Ligands." Metal-Based Drugs 3, no. 5 (1996): 211–17. http://dx.doi.org/10.1155/mbd.1996.211.

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Mixed ligands biologically active complexes of cobalt(II), copper(II) and nickel(II) with nicotinoylhydrazine-derived ONO, NNO and SNO donor schiff-base ligands having the same metal ion but different anions such as sulphate, nitrate, oxalate and acetate have been synthesised and characterised on the basis of their physical, analytical and spectral data. In order to evaluate the role of anions on their bioability, these ligands and their synthesised metal complexes with various anions have been screened against bacterial species such as Escherichia coli, Pseudomonas aeruginosa and Staphylococc

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Deyab, Mohamed, Magda El-Adl, Fatma Ward, and Eman Omar. "Trophic status, phytoplankton diversity, and water quality at Kafr El-Shinawy drinking-water treatment plant, Damietta." Journal of Water Supply: Research and Technology-Aqua 70, no. 3 (2021): 342–60. http://dx.doi.org/10.2166/aqua.2021.122.

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Abstract This work aims to study the seasonal fluctuation in physicochemical characteristics, trophic status, and some pollutants influencing phytoplankton diversity, and water quality at a compact Kafr El-Shinawy drinking-water treatment plant, Damietta – Egypt seasonally during 2018. Phytoplankton distribution was affected by the trophic status of water, level of pollutants, and physicochemical treatment processes of water. The predominance of phytoplankton species, especially Aphanizomenon flos aquae (Cyanophyta), Gomphosphaeria lacustris (Cyanophyta), Microcystis aeruginosa (Cyanophyta), N

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Shi, Zheng-Jun, Ming-Guo Ma, and Jie-Fang Zhu. "Recent Development of Photocatalysts Containing Carbon Species: A Review." Catalysts 9, no. 1 (2018): 20. http://dx.doi.org/10.3390/catal9010020.

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Undoubtedly, carbon-based (nano)composites can be promising photocatalysts with improved photocatalytic activity due to the coupling effect from the incorporation of carbon species. In this mini-review, we focus on the recent development of photocatalysts based on carbon-based (nano)composites. TiO2 is well-known as a typical photocatalyst. Special attention is paid to the various types of carbon–TiO2 composites such as C-doped TiO2, N–C-doped TiO2, metal–C-doped TiO2, and other co-doped C/TiO2 composites. Various synthetic strategies including the solvothermal/hydrothermal method, sol–gel met

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Khuna, Surapong, Nakarin Suwannarach, Jaturong Kumla, et al. "Apophysomyces thailandensis (Mucorales, Mucoromycota), a new species isolated from soil in northern Thailand and its solubilization of non-soluble minerals." MycoKeys 45 (January 29, 2019): 75–92. http://dx.doi.org/10.3897/mycokeys.45.30813.

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A new species of soil fungi, described herein asApophysomycesthailandensis, was isolated from soil in Chiang Mai Province, Thailand. Morphologically, this species was distinguished from previously describedApophysomycesspecies by its narrower trapezoidal sporangiospores. A physiological determination showed thatA.thailandensisdiffers from otherApophysomycesspecies by its assimilation of D-turanose, D-tagatose, D-fucose, L-fucose, and nitrite. A phylogenetic analysis, performed using combined internal transcribed spacers (ITS), the large subunit (LSU) of ribosomal DNA (rDNA) regions, and a part

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Hatcher, Lauren E., and Paul R. Raithby. "Solid-state photochemistry of molecular photo-switchable species: the role of photocrystallographic techniques." Acta Crystallographica Section C Crystal Structure Communications 69, no. 12 (2013): 1448–56. http://dx.doi.org/10.1107/s010827011303223x.

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Over the last 30 years, the single-crystal photocrystallographic technique has been developed to determine the three-dimensional crystal and molecular structures of metastable species which have been generated in the crystal photochemically. Transition-metal complexes that have been investigated using this methodology include complexes that contain nitrosyl, dinitrogen, sulfur dioxide and nitrite ligands, all of which form new linkage isomers in the solid state when photoactivated by light of the appropriate wavelength. Both steric and electronic factors determine the level of the conversion f

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Baudys, Michal, Šárka Paušová, Petr Praus, et al. "Graphitic Carbon Nitride for Photocatalytic Air Treatment." Materials 13, no. 13 (2020): 3038. http://dx.doi.org/10.3390/ma13133038.

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Graphitic carbon nitride (g-C3N4) is a conjugated polymer, which recently drew a lot of attention as a metal-free and UV and visible light responsive photocatalyst in the field of solar energy conversion and environmental remediation. This is due to its appealing electronic band structure, high physicochemical stability and earth-abundant nature. In the present work, bulk g-C3N4 was synthesized by thermal decomposition of melamine. This material was further exfoliated by thermal treatment. S-doped samples were prepared from thiourea or further treatment of exfoliated g-C3N4 by mesylchloride. S

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Lenzi, Anna, Alessandro Orlandini, Roberta Bulgari, Antonio Ferrante, and Piero Bruschi. "Antioxidant and Mineral Composition of Three Wild Leafy Species: A Comparison Between Microgreens and Baby Greens." Foods 8, no. 10 (2019): 487. http://dx.doi.org/10.3390/foods8100487.

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Wild plants may play an important role in human nutrition and health and, among them, many are the leafy species. We hypothesized that the wild greens could be profitably grown as microgreens and baby greens, specialty products whose market is increasing. We compared three wild leafy species (Sanguisorba minor Scop., Sinapis arvensis L., and Taraxacum officinale Weber ex F. H. Wigg.) harvested at the microgreen and baby green stages. Seedlings were grown hydroponically in a half-strength Hoagland nutrient solution under controlled climatic conditions. At harvest, the yield was assessed, and ch

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Turner, N., A. L. Ballard, R. C. Bray, and S. Ferguson. "Investigation by electron paramagnetic resonance spectroscopy of the molybdenum centre of respiratory nitrate reductase from Paracoccus denitrificans." Biochemical Journal 252, no. 3 (1988): 925–26. http://dx.doi.org/10.1042/bj2520925.

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The molybdenum centre of respiratory nitrate reductase from Paracoccus denitrificans has been investigated by e.p.r. spectroscopy of Mo(V). In common with the centres of the analogous enzymes from Escherichia coli and Pseudomonas aeruginosa, it undergoes a pH- and anion-dependent transition between two different e.p.r. signal-giving species. Comparison of the relevant e.p.r. parameters extracted with the help of computer simulations reveals ligation of the metal in the active centres of the three enzymes to be identical.

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Kwan, Billy K. Y., Virginia K. Y. Un, S. G. Cheung, and Paul K. S. Shin. "Horseshoe crabs as potential sentinel species for coastal health: juvenile haemolymph quality and relationship to habitat conditions." Marine and Freshwater Research 69, no. 6 (2018): 894. http://dx.doi.org/10.1071/mf17210.

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As an interface between terrestrial and marine environments, coastal and estuarine areas are particularly prone to various pollution stresses. Identification of sentinel species is, therefore, essential to provide precautionary information on coastal health conditions. Given their significant ecological roles in estuarine ecosystems, horseshoe crabs are a potential species to indicate the general health status of coastal habitats. The present study demonstrated that the changes in haemolymph composition pattern of two Asian juvenile horseshoe crab species (Tachypleus tridentatus and Carcinosco

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Tang, Rong, Renli Ding, and Xianchuan Xie. "Preparation of oxygen-doped graphitic carbon nitride and its visible-light photocatalytic performance on bisphenol A degradation." Water Science and Technology 78, no. 5 (2018): 1023–33. http://dx.doi.org/10.2166/wst.2018.361.

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Abstract A novel metal-free oxygen-doped graphitic carbon nitride (O-g-C3N4) was synthesized by the pre-treatment of bulk graphitic carbon nitride (g-C3N4) with hydrogen peroxide (H2O2), and combined with high-temperature calcination treatment. The obtained 2-O-g-C3N4 catalyst exhibits high activity in visible light photocatalytic degradation of bisphenol A (BPA) with a mineralization rate as high as 62.3%. According to the characterization results of X-ray diffraction, transmission electron microscopy, UV-visible spectroscopy, Brunauer-Emmett-Teller and photoluminescence spectroscopy analyses

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Large, Alexander I., Sebastian Wahl, Salvatore Abate, et al. "Investigations of Carbon Nitride-Supported Mn3O4 Oxide Nanoparticles for ORR." Catalysts 10, no. 11 (2020): 1289. http://dx.doi.org/10.3390/catal10111289.

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Earth-abundant Mn-based oxide nanoparticles are supported on carbon nitride using two different immobilization methods and tested for the oxygen reduction reaction. Compared to the metal free CN, the immobilization of Mn oxide enhances not only the electrocatalytic activity but also the selectivity towards the 4e- reduction reaction of O2 to H2O. The XPS analysis reveals the interaction of the pyridine N species with Mn3O4 nanoparticles being particularly beneficial. This interaction is realized—although to a limited extent—when preparing the catalysts via impregnation; via the oleic acid rout

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Chang, Cecily C. Y., James S. Kuwabara, and Sofie P. Pasilis. "Phosphate and Iron Limitation of Phytoplankton Biomass in Lake Tahoe." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 6 (1992): 1206–15. http://dx.doi.org/10.1139/f92-136.

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Field measurements and bioassay experiments were coupled to investigate the interdependent processes affecting phytoplankton biomass at Lake Tahoe using a trace metal protocol. Water samples were analyzed for suspended particulate matter, dissolved organic carbon, major ions and macronutrients, adenosine triphosphate, and phytoplankton abundance. Concentrations of total Cd [Formula: see text], Cu (2.25–8.85 nM), and Fe (22–49 nM) were similar to or lower than those reported for other oligotrophic lakes. Bioassays were carried out to assess the response of inoculated, single-species diatom popu

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Krupa, Elena, Sophia Barinova, Sophia Romanova, Moldir Aubakirova, and Nazia Ainabaeva. "Planktonic Invertebrates in the Assessment of Long-Term Change in Water Quality of the Sorbulak Wastewater Disposal System (Kazakhstan)." Water 12, no. 12 (2020): 3409. http://dx.doi.org/10.3390/w12123409.

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The multicomponent composition of wastewater makes it challenging to assess its quality objectively, but the last one is a prerequisite for the safe re-use of wastewater. The solution to this problem should be aimed at finding criteria that make it possible to increase the objectivity of assessing the water quality of reservoirs with multicomponent pollution. This work analyzes the water quality of the Sorbulak wastewater disposal system in the summer of 2017, based on chemical variables and zooplankton structure and assess the long-term changes in the water quality of Sorbulak. According to t

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Nielsen, Marie Bank, Kasper Urup Kjeldsen, and Kjeld Ingvorsen. "Desulfitibacter alkalitolerans gen. nov., sp. nov., an anaerobic, alkalitolerant, sulfite-reducing bacterium isolated from a district heating plant." International Journal of Systematic and Evolutionary Microbiology 56, no. 12 (2006): 2831–36. http://dx.doi.org/10.1099/ijs.0.64356-0.

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A novel alkalitolerant, anaerobic bacterium, designated strain sk.kt5T, was isolated from a metal coupon retrieved from a corrosion-monitoring reactor of a Danish district heating plant (Skanderborg, Jutland). The cells of strain sk.kt5T were motile, rod-shaped (0.4–0.6×2.5–9.6 μm), stained Gram-positive and formed endospores. Strain sk.kt5T grew at pH 7.6–10.5 (with optimum growth at pH 8.0–9.5), at temperatures in the range 23–44 °C (with optimum growth at 35–37 °C), at NaCl concentrations in the range 0–5 % (w/v) (with optimum growth at 0–0.5 %) and required yeast extract for growth. Only a

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Kaksonen, Anna H., Stefan Spring, Peter Schumann, Reiner M. Kroppenstedt, and Jaakko A. Puhakka. "Desulfurispora thermophila gen. nov., sp. nov., a thermophilic, spore-forming sulfate-reducer isolated from a sulfidogenic fluidized-bed reactor." International Journal of Systematic and Evolutionary Microbiology 57, no. 5 (2007): 1089–94. http://dx.doi.org/10.1099/ijs.0.64593-0.

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A thermophilic, Gram-positive, endospore-forming, sulfate-reducing bacterium was isolated from a sulfidogenic fluidized-bed reactor treating acidic metal- and sulfate-containing water. The strain, designated RA50E1T, was rod-shaped and motile. The strain grew at 40–67 °C (optimum growth at 59–61 °C) and pH 6.4–7.9 (optimum growth at pH 7.0–7.3). The strain tolerated up to 1 % NaCl. Sulfate, sulfite, thiosulfate and elemental sulfur were used as electron acceptors, but not nitrate, nitrite or iron(III). Electron donors utilized were H2/CO2 (80 : 20, v/v), alcohols, various carboxylic acids and

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Liu, Hongjin, Haining Wu, Jun Lv, et al. "SBA-15 Templated Mesoporous Graphitic C3N4 for Remarkably Enhanced Photocatalytic Degradation of Organic Pollutants under Visible Light." Nano 14, no. 11 (2019): 1950136. http://dx.doi.org/10.1142/s1793292019501364.

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Organic pollutants in water have been threatening public and environmental health. Developing efficient and sustainable photocatalysts working for degradation of organic pollutants under visible light becomes a big challenge. In this paper, high-efficiency visible light driven catalyst ordered mesoporous graphite nitride carbon (mpg-C3N4) was prepared by using SBA-15 as template and dicyandiamide (C2H4N4) as precursor. The specific surface area of mpg-C3N4 can be increased remarkably as compared to that of the bulk graphite nitrite carbon (g-C3N4) by adjusting the ratio of SBA-15 to dicyandiam

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Moreau, John W., Robert A. Zierenberg, and Jillian F. Banfield. "Diversity of Dissimilatory Sulfite Reductase Genes (dsrAB) in a Salt Marsh Impacted by Long-Term Acid Mine Drainage." Applied and Environmental Microbiology 76, no. 14 (2010): 4819–28. http://dx.doi.org/10.1128/aem.03006-09.

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ABSTRACT Sulfate-reducing bacteria (SRB) play a major role in the coupled biogeochemical cycling of sulfur and chalcophilic metal(loid)s. By implication, they can exert a strong influence on the speciation and mobility of multiple metal(loid) contaminants. In this study, we combined DsrAB gene sequencing and sulfur isotopic profiling to identify the phylogeny and distribution of SRB and to assess their metabolic activity in salt marsh sediments exposed to acid mine drainage (AMD) for over 100 years. Recovered dsrAB sequences from three sites sampled along an AMD flow path indicated the dominan

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