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1. Conversion of dinitrogen to tris(trimethylsilyl)amine catalyzed by titanium triamido-amine complexes

Author:
Ghana, Priyabrata; van Krüchten, Franziska D.; Spaniol, Thomas P.; van Leusen, Jan; Kögerler, Paul; Okuda, Jun
Source:
Chemical communications 2019 v.55 no.22 pp. 3231-3234
ISSN:
1364-548X
Subject:
nitrogen,   etc   ; chemical reactions; titanium;     Show all 3 Subjects
Abstract:
... By using a triaryl-Tren ligated titanium dinitrogen complex, K₂[{(Xy-N₃N)Ti}₂(μ₂-N₂)] (3), prepared by two-electron reduction of [TiCl(Xy-N₃N)] (1-Cl) under N₂ atmosphere, catalytic fixation of molecular nitrogen to form tris(trimethylsilyl)amine was achieved under ambient conditions with a turnover number (TON) of up to 16.5 per titanium atom. ...
DOI:
10.1039/c8cc09742a

2. Spatial and temporal distribution characteristics of different forms of inorganic nitrogen in three types of rivers around Lake Taihu, China

Author:
Gao, Yongxia; Yu, Jianghua; Song, Yuzhi; Zhu, Guangwei; Paerl, Hans W.; Qin, Boqiang
Source:
Environmental science and pollution research international 2019 v.26 no.7 pp. 6898-6910
ISSN:
0944-1344
Subject:
ammonium nitrogen; nitrate nitrogen; nitrogen,   etc   ; ammonium; industry; lakes; nitrates; pollution; rivers; sewage; total nitrogen; China;     Show all 12 Subjects
Abstract:
... In order to control nitrogen (N) pollution of Lake Taihu, China, we studied the spatial and temporal distribution characteristics of inorganic N in inflowing rivers polluted by industry, agriculture, and domestic sewage during low, moderate, and high flow periods. The results showed that dissolved total nitrogen (DTN) was the main fraction of total nitrogen (TN) input from these rivers. Inflowing ...
DOI:
10.1007/s11356-019-04154-w

3. New functionalized MIL-53(In) solids: syntheses, characterization, sorption, and structural flexibility

Author:
Wu, Lei; Chaplais, Gérald; Xue, Ming; Qiu, Shilun; Patarin, Joël; Simon-Masseron, Angélique; Chen, Huaxin
Source:
RSC advances 2019 v.9 no.4 pp. 1918-1928
ISSN:
2046-2069
Subject:
nitrogen,   etc   ; moieties; porosity; sorption;     Show all 4 Subjects
Abstract:
... The syntheses and characterization of a series of functionalized MIL-53(In) solids have been reported. Chemical groups with variations in steric hindrance and chemical nature (–(OH)₂, –Br or –NO₂ groups) were introduced through the terephthalate linker to modify the pore surface. Single crystal X-ray diffraction data, N₂ adsorption–desorption isotherms, and infrared spectra were systematically inv ...
DOI:
10.1039/c8ra08522f

4. A Resurrected Scenario: Single Gain and Massive Loss of Nitrogen-Fixing Nodulation

Author:
van Velzen, Robin; Doyle, Jeff J.; Geurts, Rene
Source:
Trends in plant science 2019 v.24 no.1 pp. 49-57
ISSN:
1360-1385
Subject:
nitrogen; nitrogen fixation; nitrogen-fixing bacteria,   etc   ; genes; nitrogen-fixing plants; nodulation; root nodules; symbiosis;     Show all 8 Subjects
Abstract:
... Root nodule endosymbiosis with nitrogen-fixing bacteria provides plants with unlimited access to fixed nitrogen, but at a significant energetic cost. Nodulation is generally considered to have originated in parallel in different lineages, but this hypothesis downplays the genetic complexity of nodulation and requires independent recruitment of many common features across lineages. Recent phylogeno ...
DOI:
10.1016/j.tplants.2018.10.005

5. The relative contributions of intra- and inter-specific variation in driving community stoichiometric responses to nitrogen deposition and mowing in a grassland

Author:
Hou, Shuang-Li; Lü, Xiao-Tao; Yin, Jiang-Xia; Yang, Jun-Jie; Hu, Yan-Yu; Wei, Hai-Wei; Zhang, Zhi-Wei; Yang, Guo-Jiao; Liu, Zhuo-Yi; Han, Xing-Guo
Source:
The Science of the total environment 2019 v.666 pp. 887-893
ISSN:
0048-9697
Subject:
nitrogen; nitrogen content,   etc   ; arid lands; biogeochemical cycles; grasslands; mowing; phosphorus;     Show all 7 Subjects
Abstract:
... The stoichiometric characteristics of plant communities are important controller for several fundamental ecological processes. The effects of environmental changes on community stoichiometric characteristics are driven by intra- and inter-specific variation. However, the relative importance of both pathways has seldom been empirically examined.We quantified the relative contribution of intra- and ...
DOI:
10.1016/j.scitotenv.2019.02.322

6. Nitrogen limitation affects the sinking property of Microcystis by promoting carbohydrate accumulation

Author:
Huang, Yingying; Hong, Jingjie; Liang, Chengyu; Li, Gengyang; Shen, Lin; Zhang, Haichun; Hu, Xiongxing; Chen, Xuechu
Source:
Chemosphere 2019 v.221 pp. 665-671
ISSN:
0045-6535
Subject:
nitrate nitrogen; nitrogen,   etc   ; Microcystis; autumn; carbohydrate content; carbohydrates; lakes; summer;     Show all 8 Subjects
Abstract:
... Nitrogen limitation has been proven to inhibit Microcystis proliferation, and the significant decline in Microcystis blooms in late summer or autumn has been considered to be related to the nitrogen depletion in water. Sinking loss is another factor that influences the dynamics of cyanobacteria in lakes. However, to date, it is still unclear how the sinking property of Microcystis responds to nitr ...
DOI:
10.1016/j.chemosphere.2019.01.080

7. Nitrogen balances and impacts on the algae cultivation-extraction-digestion-cultivation process

Author:
Zhang, Bingcong; Ogden, Kimberly
Source:
Algal research 2019 pp. 101434
ISSN:
2211-9264
Subject:
nitrogen; nitrogen content,   etc   ; algae; anaerobic digestion; lipid content; lipids;     Show all 6 Subjects
Abstract:
... Anaerobic digestion of lipid extracted algae is a method for recycling nutrients to a cultivation system. Growth of algae on recycled nitrogen from these systems has been demonstrated. This study focuses on how the initial nitrogen concentration impacts each stage of an integrated cultivation-extraction-digestion-cultivation process; and how the nitrogen is distributed in each step. The entire pro ...
DOI:
10.1016/j.algal.2019.101434

8. How Does an Acidic Support Affect the Hydrotreatment of a Gas Oil with High Nitrogen Content?

Author:
Nguyen, Minh-Tuan; Pirngruber, Gerhard D.; Albrieux, Florian; Chainet, Fabien; Tayakout-Fayolle, Melaz; Geantet, Christophe
Source:
Energy & fuels 2019 v.33 no.2 pp. 1467-1472
ISSN:
1520-5029
Subject:
nitrogen; nitrogen content,   etc   ; adsorption; aluminum oxide; catalysts; fuel oils; pyrroles;     Show all 7 Subjects
Abstract:
... Two NiMo sulfide catalysts, supported on Al₂O₃ and silica–alumina, respectively, were compared in the hydrotreatment of a mixture of straight-run and coker gas oil. Experiments were conducted in a continuous fixed bed reactor, at 623–643 K and 5 MPa. The Al₂O₃-supported catalyst proved to be slightly more active in HDN and significantly more active in HDS than its silica–alumina analogue. The acti ...
DOI:
10.1021/acs.energyfuels.8b04116

9. An efficient way to enhance the total nitrogen removal efficiency of the Anammox process by S0-based short-cut autotrophic denitrification

Author:
Chen, Fangmin; Li, Xiang; Yuan, Yan; Huang, Yong
Source:
Journal of environmental sciences (China) 2019 v.81 pp. 214-224
ISSN:
1001-0742
Subject:
ammonium nitrogen; nitrate nitrogen; nitrogen dioxide,   etc   ; Thiobacillus; anaerobic ammonium oxidation; denitrification; microbial communities; nitrates; nitrifying bacteria; sulfur; total nitrogen; wastewater;     Show all 12 Subjects
Abstract:
... In order to reduce the amount of NO3−–N generated by the Anammox process, and alleviate the competition between denitrification and Anammox for NO2−–N in a single reactor, the preference of S0 for reacting with coexisting NO2−–N and NO3−–N in the sulfur autotrophic denitrifying (SADN) process and the coupling effect of short-cut SADN and the Anammox process were studied. The results showed that S0 ...
DOI:
10.1016/j.jes.2019.01.010

10. Tunable chiral triazole-based halogen bond donors: assessment of donor strength in solution with nitrogen-containing acceptors

Author:
Peterson, Anna; Kaasik, Mikk; Metsala, Andrus; Järving, Ivar; Adamson, Jasper; Kanger, Tõnis
Source:
RSC advances 2019 v.9 no.21 pp. 11718-11721
ISSN:
2046-2069
Subject:
nitrogen,   etc   ; halogens; reaction mechanisms; triazoles;     Show all 4 Subjects
Abstract:
... Strong halogen bond (XB) donors are needed for the activation of neutral substrates. We demonstrate that XB donor properties of iodo-triazoles can be significantly enhanced by quaternization in combination with varying the counterion and aromatic substituent, exemplified by association constants with quinuclidine as high as 1.1 × 10⁴ M⁻¹. ...
DOI:
10.1039/c9ra01692a

11. Planar rings in nano-Saturns and related complexes

Author:
Bachrach, Steven M.
Source:
Chemical communications 2019 v.55 no.25 pp. 3650-3653
ISSN:
1364-548X
Subject:
nitrogen,   etc   ; chemical reactions; enthalpy; nanotubes;     Show all 4 Subjects
Abstract:
... Nano-Saturn complexes with a planar horizontal ring can be constructed by selective nitrogen substitution into the ortho-positions in polyaryl macrocycles. A number of intriguing supermolecular complexes can be created with these planar or ribbon macrocycles, including nano-Saturns with a flat ring, nano-Saturns with an encircling belt, and nanotubes encircled by belts or rings. These systems are ...
DOI:
10.1039/c9cc01234f

12. Slow episodic movement driven by elevated pore-fluid pressures in shallow subaqueous slopes

Author:
Carey, J.M.; Crutchley, G.J.; Mountjoy, J.J.; Petley, D.N.; McSaveney, M.J.; Lyndsell, B.
Source:
Geomorphology 2019 v.329 pp. 99-107
ISSN:
0169-555X
Subject:
nitrogen,   etc   ; deformation; landslides; New Zealand;     Show all 4 Subjects
Abstract:
... Subaqueous slopes are susceptible to a broad range of failure mechanisms and deformation styles, many of which are not well characterised. We undertook novel laboratory-based testing using a Dynamic Back-Pressured Shearbox on samples collected from an area subject to ongoing slope failures, situated on the upper slope of New Zealand's Hikurangi Margin, to determine how increases in pore water and ...
DOI:
10.1016/j.geomorph.2018.12.034

13. Comparison of nitrogen deposition across different land use types in agro-pastoral catchments of western China and Mongolia

Author:
Lv, Jinling; Buerkert, Andreas; Benedict, Katherine B.; Liu, Guojun; Lv, Chaoyan; Liu, Xuejun
Source:
Atmospheric environment 2019 v.199 pp. 313-322
ISSN:
1352-2310
Subject:
ammonium nitrogen; nitrate nitrogen; nitrogen,   etc   ; ammonia; atmospheric chemistry; cropland; land use; nitrogen dioxide; pastures; watersheds; wet deposition; China; Mongolia;     Show all 13 Subjects
Abstract:
... Very few comparative studies on atmospheric dry and wet nitrogen (N) deposition have been conducted in agro-pastoral catchment areas. In an effort to fill this knowledge gap, three interconnected land use types (cropland, mountain pasture, and plain pasture) with six sampling sites (Chinese cropland (CC), Chinese mountain pasture (CM), Chinese plain pasture (CP) Mongolia cropland (MC), Mongolia mo ...
DOI:
10.1016/j.atmosenv.2018.11.021

14. Bio-based Aromatic Amines from Lignin-Derived Monomers

Author:
Blondiaux, Enguerrand; Bomon, Jeroen; Smoleń, Michał; Kaval, Nadya; Lemière, Filip; Sergeyev, Sergey; Diels, Ludo; Sels, Bert; Maes, Bert U. W.
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.7 pp. 6906-6916
ISSN:
2168-0485
Subject:
nitrogen,   etc   ; aromatic amines; carbon; chromatography;     Show all 4 Subjects
Abstract:
... A new approach to synthesize valuable 3,4-dialkoxyanilines and alkyl propionates from lignin-derived 4-propylguaiacol and -catechol with overall isolated yields up to 65% has been described. The strategy is based on the introduction of nitrogen via a Beckmann rearrangement. Amino introduction therefore coincides with a C-defunctionalization reaction; overall a replacement of the propyl chain by an ...
DOI:
10.1021/acssuschemeng.8b06467

15. Nitrogen Retention by Sphagnum fuscum in Laboratory Mesocosms: Responses to Experimentally Added NH4+-N and NO3−-N

Author:
Hartsock, Jeremy A.; Wieder, R. Kelman; Vile, Melanie A.
Source:
Wetlands 2019 v.39 no.1 pp. 79-85
ISSN:
0277-5212
Subject:
ammonium nitrogen; nitrogen; nitrogen fixation,   etc   ; Sphagnum fuscum; bogs; leachates; nitrates; nitrogen retention; peat; pollution load; rain; Alberta;     Show all 12 Subjects
Abstract:
... To evaluate the effects of increasing atmospheric N deposition on net C and N accumulation in Sphagnum-dominated bogs, we conducted a laboratory mesocosm experiment. Following 45 days of watering with N-free rainwater, mesocosms were exposed to simulated atmospheric N deposition values of 0, 4.14, 8.18, and 12.42 mg N m⁻² da⁻¹ over a 108 day period. We quantified N retention from leachate N concen ...
DOI:
10.1007/s13157-018-1066-x

16. Effects of fertilizer nitrogen shortly before forcing through flowering on carbon-nitrogen composition and flowering of Phalaenopsis

Author:
Lin, Jen-An; Susilo, Hadi; Lei, Jia-Yun; Chang, Yao-Chien Alex
Source:
Scientia horticulturae 2019 v.252 pp. 61-70
ISSN:
0304-4238
Subject:
nitrogen; nitrogen content; nitrogen fertilizers,   etc   ; Phalaenopsis; cultivars; fertilizer rates; flowering; growth habit; hybrids; roots; vegetative growth;     Show all 11 Subjects
Abstract:
... Phalaenopsis (Phalaenopsis spp.) is an important orchid crop worldwide. Effect of fertilization on its growth has been much investigated, but studies about how nitrogen (N) fertilization affects flowering have sometimes yielded conflicting results. This study investigated how short-term N application affects the flowering of phalaenopsis, in relation to the size of stored N pool. Two cultivars wit ...
DOI:
10.1016/j.scienta.2019.02.006

17. Field Evaluation of Potato N Needs Following Forage Legumes

Author:
Kelling, Keith A.; Andraski, Todd W.; Speth, Phillip E.
Source:
American journal of potato research 2019 v.96 no.1 pp. 62-68
ISSN:
1099-209X
Subject:
nitrate nitrogen; nitrogen; nitrogen fertilizers,   etc   ; Trifolium pratense; alfalfa; forage; forage legumes; petioles; potatoes; Wisconsin;     Show all 10 Subjects
Abstract:
... In an attempt to quantify the nitrogen (N) contribution from forage legumes to succeeding potatoes, trials were conducted on 28 Wisconsin alfalfa or red clover fields. Potato total yield and crop value were determined following in-season fertilizer N applications of 0 to 280 kg ha⁻¹. Only 2 of the 12 alfalfa sites and 6 of the 16 red clover sites responded to applied fertilizer N when total yield ...
DOI:
10.1007/s12230-018-9689-2

18. Denitrification performance and microbial versatility in response to different selection pressures

Author:
Pishgar, Roya; Dominic, John Albino; Sheng, Zhiya; Tay, Joo Hwa
Source:
Bioresource technology 2019 v.281 pp. 72-83
ISSN:
0960-8524
Subject:
ammonium nitrogen; nitrate nitrogen; nitrite nitrogen,   etc   ; Acinetobacter; Arcobacter; Comamonas; Flavobacterium; Pseudomonas; Thauera; Zoogloea; biodiversity; biomass; denitrification; denitrifying microorganisms; microbial communities; nitrates; nitrification; nitrites; nitrogen; nitrogen oxides; selection pressure;     Show all 21 Subjects
Abstract:
... This study investigated functional dynamics of microbial community in response to different selection pressures, with a focus on denitrification. Suspended-biomass experiments demonstrated limited aerobic and relatively higher anoxic nitrate and nitrite reduction capabilities; the highest NO2-N and NO3-N removal rates were 1.3 ± 0.1 and 0.74 ± 0.01 in aerobic and 1.4 ± 0.05 and 3.4 ± 0.1 mg/L.h in ...
DOI:
10.1016/j.biortech.2019.02.061

19. A field scale evaluation of Gracilaria lemaneiformis co-cultured with Crassostrea gigas as a nutrient bioextraction strategy in Yantian Bay, China

Author:
Wei, Zhangliang; Huo, Yuanzi; Liu, Qiao; Yang, Fangfang; Long, Lijuan; Bi, Hongsheng; Fan, Chunlei; He, Peimin
Source:
Algal research 2019 v.38 pp. 101407
ISSN:
2211-9264
Subject:
ammonium nitrogen; nitrate nitrogen; nitrite nitrogen,   etc   ; Crassostrea gigas; Gracilaria; algae; coculture; environmental impact; eutrophication; mariculture; nitrogen; nitrogen balance; nutrients; phosphates; China;     Show all 15 Subjects
Abstract:
... Nutrient bioextraction using Gracilaria lemaneiformis co-cultured with Crassostrea gigas in a eutrophic, intensive mariculture area was evaluated over 49 days in Yantian Bay, which is an enclosed bay within Sansha Bay, China. The amount of nitrogen removed by G. lemaneiformis was 4.07 ± 0.25 kg and 4.49 ± 0.57 kg per ton (FW) at depths of 0.4–0.8 m and 1.0–1.2 m, respectively. The ranges of ammoni ...
DOI:
10.1016/j.algal.2019.101407

20. Enhanced nitrogen removal of low C/N wastewater in constructed wetlands with co-immobilizing solid carbon source and denitrifying bacteria

Author:
Yu, Guanlong; Peng, Haiyuan; Fu, Yongjiang; Yan, Xiaojiang; Du, Chunyan; Chen, Hong
Source:
Bioresource technology 2019
ISSN:
0960-8524
Subject:
ammonium nitrogen; carbon nitrogen ratio; nitrate nitrogen,   etc   ; Pseudomonas fluorescens; carbon; chemical oxygen demand; constructed wetlands; denitrification; denitrifying bacteria; granules; nitrogen; pH; rice hulls; subsurface flow; total nitrogen; wastewater;     Show all 16 Subjects
Abstract:
... The denitrification process for treating low carbon/nitrogen (C/N) wastewater in horizontal subsurface flow constructed wetlands (CWs) is often restricted by the carbon source and both abundance and activity of denitrifying bacteria. In this study, the effects of rice husks or immobilized Pseudomonas fluorescens on N removal were investigated under various conditions in a synthetic wastewater solu ...
DOI:
10.1016/j.biortech.2019.02.043