Optical diagnostics of active species in N2 microwave flowing post-discharges

Bockel, S.; Diamy, A. M.; Ricard, A.

doi:10.1016/0257-8972(94)08205-7

Cited by 36 publications

(41 citation statements)

References 7 publications

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“…In this paper, the atomic nitrogen concentration at the source exit is quantified by measuring the optical emission in the jet of the N2 First Positive System (FPS), N2(B 3 Πg → A 3 Σu + ), which has an intensity proportional to the rate of recombination of N atoms because direct electron excitation of N2 is absent. The rate of decay of the FPS emission can then be used to determine N atom concentrations, provided the gas flow velocity in the jet is known [6]. Quantifying atomic N in this way is not new; in previous work by other authors, the flowing afterglow, or jet, from a small-scale atmospheric pressure source is directed into a quartz tube, which allows for a large spatial extent of the jet by adjusting flow velocity, while simultaneously preventing admixture of the surrounding air [3,7].…”

Section: Introductionmentioning

confidence: 99%

The relation between the production efficiency of nitrogen atoms and the electrical characteristics of a dielectric barrier discharge

Peeters

Yang

Sanden

2015

Plasma Sources Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

The relation between the production efficiency of nitrogen atoms and the electrical characteristics of a dielectric barrier discharge

Peeters

Yang

Sanden

2015

Plasma Sources Sci. Technol.

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“…Arising as a waste product in a variety of ways, keratin is an insoluble protein and a component of epidermal and skeletal tissues (Bradbury, 1973). Because of a higher degree of cross-linking by disulphide bridges, hydrogen bonds and hydrophobic interactions, keratin is poorly susceptible to degradation and poorly susceptible to digestion by most common peptidases such as trypsin, pepsin, and papin (Bockel et al, 1995; Cohlberg, 1993). In particular, feathers constitute troublesome waste products, being mainly composed of hard β-keratin, and are produced in large quantities in commercial poultry processing plants.…”

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Purification and Characterization of a Keratinase from a Feather-Degrading Fungus,Aspergillus flavusStrain K-03

Kim

2007

Mycobiology

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A keratinolytic enzyme secreted by Aspergillus flavus K-03 cultured in feather meal basal medium (FMBM) containing 2% (w/v) chicken feather was purified and characterized. Keratinolytic enzyme secretion was the maximal at day 16 of the incubation period at pH 8 and 28℃. No relationship was detected between enzyme yield and increase of fungal biomass. The fraction obtained at 80% ammonium sulfate saturation showed 2.39-fold purification and was further purified by gel filtration in Sephadex G-100 followed by ion exchange chromatography on DEAE-Sephadex A-50, yielding an active protein peak showing 11.53-fold purification. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and zymograms indicated that the purified keratinase is a monomeric enzyme with 31 kDa molecular weight. The extracellular keratinase of A. flavus was active in a board range of pH (7~10) and temperature (30℃~70℃) profiles with the optimal for keratinase activity at pH 8 and 45℃. The keratinase activity was totally inhibited by protease inhibitors such as phenylmethylsulfonyl fluoride (PMSF), iodoacetic acid, and ethylenediaminetetraacetate (EDTA) while no reduction of activity by the addition of dithiothreitol (DTT) was observed. N-terminal amino acid sequences were up to 80% homologous with the fungal subtilisins produced by Fusarium culmorum. Therefore, on the basis of these characteristics, the keratinase of A. flavus K-03 is determined to be subtilisins-like.

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“…20 The measured increase of nitrogen incorporation in the films with the discharge on is a result of the interaction of the laser ablated carbon species with the reactive atomic nitrogen species present in the postdischarge. 21 When the discharge is off, the laser ablated species interacts solely with the relatively stable N 2 molecule in ambient gas and, consequently, very little N is incorporated in the films. In addition, Table I shows that ͓N͔ decreases with increasing deposition temperature.…”

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X-ray photoelectron spectroscopy of carbon nitride films deposited by graphite laser ablation in a nitrogen postdischarge

Tabbal

Mérel

Moisa

et al. 1996

Applied Physics Letters

118

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Carbon nitride thin films have been deposited on silicon substrates, using a newly developed surface wave discharge/pulsed laser deposition system. Nitrogen incorporation in the films is examined by x-ray photoelectron spectroscopy (XPS). It shows that interaction between the laser ablated carbon species and nitrogen atoms from the surface-wave N2 plasma enhances the incorporation of N in the carbon nitride layers, for example, up to 19% at a deposition pressure of 2 mTorr. Increasing the deposition temperature decreases nitrogen incorporation and changes the local chemical environment of nitrogen atoms.

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Optical diagnostics of active species in N2 microwave flowing post-discharges

Cited by 36 publications

References 7 publications

The relation between the production efficiency of nitrogen atoms and the electrical characteristics of a dielectric barrier discharge

The relation between the production efficiency of nitrogen atoms and the electrical characteristics of a dielectric barrier discharge

Purification and Characterization of a Keratinase from a Feather-Degrading Fungus,Aspergillus flavusStrain K-03

X-ray photoelectron spectroscopy of carbon nitride films deposited by graphite laser ablation in a nitrogen postdischarge

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