The method of analysis of small businesses

Soldatova, Liubov Ivanovna; Ivanova, Оksana; Krivtsova, Irina; Soldatova, Alexandera

doi:10.15862/178evn614

Cited by 4 publications

(8 citation statements)

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“…The strong donation from the thiolate pushes the d z2 -σ n to higher energy and increases admixture with the d xz -π* NO . 98,[151][152][153][154][155][156] Praneeth and co-workers 157 noted that while one could envision the {FeNO} 6 species assuming a low-spin Fe 3+ -NO˙ configuration (ca. 1 kcal•mol −1 higher in energy), the bent geometry of the NO moiety is not an intrinsic quality of this assignment.…”

Section: Nor Proton Transfermentioning

confidence: 99%

Biological and Bioinspired Inorganic N–N Bond-Forming Reactions

et al. 2020

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The metallobiochemistry underlying the formation of the inorganic N-N-bond-containing molecules nitrous oxide (N 2 O), dinitrogen (N 2 ), and hydrazine (N 2 H 4 ) is essential to the lifestyles of diverse organisms. Similar reactions hold promise as means to use N-based fuels as alternative, carbon-free energy sources. This review discusses research efforts to understand the mechanisms underlying biological N-N bond formation in primary metabolism and how the associated reactions are tied to energy transduction and organismal survival. These efforts comprise studies of both natural and engineered metalloenzymes, as well as synthetic model complexes.

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Section: Nor Proton Transfermentioning

confidence: 99%

Biological and Bioinspired Inorganic N–N Bond-Forming Reactions

et al. 2020

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“…2). These bands are assigned to the FeNO bending mode, δ(FeNO), Fe-NO stretch, ν(Fe-NO), and N-O stretch, ν(N-O) of {FeNO} 6 Clds (Table 1) in order of increasing frequency based on nuclear resonance vibrational spectroscopy assignments for nitrosyl complexes of iron porphyrinates [46] and rR assignments for {FeNO} 6 complexes of Mb [47], NP [48], and FixL from Sinorhizobiun melilotti (SmFixL). [49] While both δ(FeNO) and ν(Fe-NO) bands are observed in the rR spectra for all {FeNO} 6 Clds, they overlap substantially, resulting in 14 NO − 15 NO difference features whose maxima and minima do not correspond directly to the mode frequencies.…”

Section: Ferric Clds Form {Feno} 6 Complexesmentioning

confidence: 99%

“…The two isotopically sensitive bands observed for KpCld {FeNO} 7 at 1609 and 548 cm −1 are assigned as ν(N-O) and ν(Fe-NO), respectively, and are also characteristic of a 6cLS complex. [25,47] At pH 6.0 the KpCld {FeNO} 7 UV-vis spectrum has its Soret at 401 nm, a shoulder near 397 nm, α/β bands at 566 nm and 535 nm, and a charge transfer (CT) band at 483 nm (Fig. S6).…”

Section: The Coordination State Of {Feno} 7 Cld Complexes Is Ph Dependentmentioning

confidence: 99%

“…Discussion complexes along these lines being modulated by the extent of Fe II →NO + π backbonding. [47] The offsets of the two backbonding correlation lines along the ν(N-O) axis has been explained in terms of Lewis acid-base interactions in the distal pocket of the Mb variants. [47,56] The higher ν(N-O) frequency line is attributed to Lewis acid-base interactions between the NO + ligand and either a distal histidine or an exogenous water molecule.…”

Section: Formation Of 5c {Feno} 7 Clds Is [No] Dependentmentioning

confidence: 99%

“…[47] The offsets of the two backbonding correlation lines along the ν(N-O) axis has been explained in terms of Lewis acid-base interactions in the distal pocket of the Mb variants. [47,56] The higher ν(N-O) frequency line is attributed to Lewis acid-base interactions between the NO + ligand and either a distal histidine or an exogenous water molecule. The lower ν(N-O) frequency line represents the backbonding correlation in the absence of Lewis donation to the coordinated NO + in systems having solvent-inaccessible distal pockets and no endogenous distal bases.…”

Section: Formation Of 5c {Feno} 7 Clds Is [No] Dependentmentioning

confidence: 99%

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Structure and reactivity of chlorite dismutase nitrosyls

Geeraerts

Heskin

DuBois

et al. 2020

Journal of Inorganic Biochemistry

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Ferric nitrosyl ({FeNO} 6 ) and ferrous nitrosyl ({FeNO} 7 ) complexes of the chlorite dismutases (Cld) from Klebsiella pneumoniae and Dechloromonas aromatica have been characterized using UV-visible absorbance and Soret-excited resonance Raman spectroscopy. Both of these Clds form kinetically stable {FeNO} 6 complexes and they occupy a unique region of ν(Fe-NO) / ν(N-O) correlation space for proximal histidine liganded heme proteins, characteristic of weak Fe-NO and N-O bonds. This location is attributed to admixed Fe III -NO • character of the {FeNO} 6 ground state. Cld {FeNO} 6 complexes undergo slow reductive nitrosylation to yield {FeNO} 7 complexes. The affects of proximal and distal environment on reductive nitroylsation rates for these dimeric and pentameric Clds are reported. The ν(Fe-NO) and ν(N-O) frequencies for Cld {FeNO} 7 complexes reveal both six-coordinate (6c) and five-coordinate (5c) nitrosyl hemes. These 6c and 5c forms are in a pH dependent equilibrium. The 6c and 5c {FeNO} 7 Cld frequencies provided positions of both Clds on their respective ν(Fe-NO) vs ν(N-O) correlation lines. The 6c {FeNO} 7 complexes fall below (along the ν(Fe-NO) axis) the correlation line that reports hydrogen-bond donation to N NO , which is consistent with a relatively weak Fe-NO bond. Kinetic and spectroscopic evidence is consistent with the 5c {FeNO} 7 Clds having NO coordinated on the proximal side of the heme, analogous to 5c {FeNO} 7 hemes in proteins known to have NO sensing functions.

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Lead Particle Size Fractionation and Identification in Newark, New Jersey’s Drinking Water

Lytle¹,

Schock²,

Formal

et al. 2020

Environ. Sci. Technol.

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Following a pH reduction in their drinking water over a span of more than 20 years, the City of Newark, New Jersey, has struggled with elevated lead (Pb) release from Pb service lines and domestic plumbing in the zone fed by the Pequannock Water Treatment Plant. In response, Newark initiated orthophosphate addition and provided faucet-mounted point-of-use (POU) filters and pitcher filters certified for Pb and particulate reduction under NSF/ANSI Standards 53 and 42 to residential homes in that zone. Water chemistry analysis and size fractionation sampling were

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The method of analysis of small businesses

Cited by 4 publications

References 0 publications

Biological and Bioinspired Inorganic N–N Bond-Forming Reactions

Biological and Bioinspired Inorganic N–N Bond-Forming Reactions

Structure and reactivity of chlorite dismutase nitrosyls

Lead Particle Size Fractionation and Identification in Newark, New Jersey’s Drinking Water

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