2,374 research outputs found
Biotransformation of indigo carmine to isatin sulfonic acid by lyophilized mycelia from Trametes versicolor
Indigo carmine (IC) was biotrasformed to 5-isatinsulfonic acid using intracellular and associated enzymes from Trametes versicolor lyophilized mycelia; even when extracellular enzymes were absent, in high concentration solutions of IC (4 000 mg L-1) and non-sterile condition. T. versicolor was grown in wheat strew and malt extract liquid medium and harvested during the stationary growth phase, it was lyophilized and made to react with indigo carmine. Experimental series were performed at different IC concentrations (from 100 to 4000 mg L-1). Color removal was 99.90, 98.75, 88.35, 79.47, 70.0 and 40.35% for 100, 500, 1000, 2000, 3000 and 4000 mg L-1 of IC, respectively after 120 h with exception for 100 mg L-1 of IC, which reached total color removal after 1 h. Reacted mixture byproducts were separated by column chromatography. IC biotransformation to 5-isatinsulfonic acid was confirmed by HPLC, UV-VIS, FT- IR, 1H and 13C NMR spectroscopy. Activity of laccase from lyophilized mycelia was conserved after one year at 4°C. Dehydrated biological material in colorant biodegradation is a new method which allows obtaining high discoloration efficiencies. Lyophilized mycelia could be more stable than traditionally used wet biomass or liquid culture for biodegradation of color dye.Key words: Biodegradation, indigo carmine, Trametes versicolor
Microstructural, Mechanical and Wear Properties of Atmospheric Plasma-Sprayed and High-Velocity Oxy-Fuel AlCoCrFeNi Equiatomic High-Entropy Alloys (HEAs) Coatings
In this investigation, atmospheric plasma spray (APS) and high-velocity oxy-fuel (HVOF) techniques were used to produce AlCoCrFeNi coatings. High-entropy alloys (HEAs), due to their mechanical, chemical, and physical properties are capturing the attention of the international scientific community. Starting feedstock powders were characterized in terms of size, phase, and size, and corrosion test in NaCl, ball on disk, rubber wheel, and jet erosion tests was carried out on the obtained coatings. The results of the tribological investigation show that in the case of APS coatings, corrosion and wear behavior depend on the microstructure phases of the coating, as well as the amount of oxides. In particular, the wear morphology of APS surfaces is characterized by brittle fracture, with the presence of pores, cracks, and grooves. For HVOF coatings, further investigations on process parameters are needed because of the poor adhesion strength between the coating and the substrate. Anyway, the obtained corrosion resistance of HVOF coating is greater than that of the C steel substrate used to benchmark the results, and in addition, it ensures better performances in rubber wheel and jet erosion tests, but its wear resistance in the ball-ondisk test is worse because of the debris remaining in the wear track
P 388 Diagnostic value of polymerase chain reaction of aqueous and vitreous humor for infectious uveitis in AIDS patients
Zinc(II), cobalt(II) and manganese(II) networks with phosphoserine ligand: Synthesis, crystal structures magnetic and conduction properties
A series of zinc(II), cobalt(II) and manganese(II) coordination networks with the phosphoserine ligand (Pser) is synthesized and characterized. Whereas in compounds 1 and 2 with the general formula [M(Pser)]n [M = Zn (1) and Co(2)], the metal(II) ion presents a tetrahedral geometry, in [Co(Pser)(H2O)2]n (3) and [Mn(Pser)(H2O)]n (4)], the metal(II) ions are in a distorted octahedral geometry. The 3D frameworks are formed by inorganic layers built up from MO4 or MO6 polyhedra and phosphate groups. These layers are linked by the carboxylate groups of the phosphoserine ligand. The presence of extended hydrogen bonding stabilizes the 3D network and favors the proton transfer leading to moderate proton conductors. The highest proton conductivity, 2.70·10â5 S cmâ1 (at 80 ÂșC and 95% RH), is obtained for compound 3. Temperature dependent magnetic susceptibility measurements for 2â4 reveal predominant antiferromagnetic interactions between the paramagnetic metal(II) ions.Proyectos MAT2013-41836-R y MAT2016-77648-R del MINECO, y proyecto (P12-FQM-1656) de la Junta de AndalucĂa
SSDSS IV MaNGA - Properties of AGN host galaxies
We present here the characterization of the main properties of a sample of 98
AGN host galaxies, both type-II and type-I, in comparison with those of about
2700 non-active galaxies observed by the MaNGA survey. We found that AGN hosts
are morphologically early-type or early-spirals. For a given morphology AGN
hosts are, in average, more massive, more compact, more central peaked and
rather pressurethan rotational-supported systems. We confirm previous results
indicating that AGN hosts are located in the intermediate/transition region
between star-forming and non-star-forming galaxies (i.e., the so-called green
valley), both in the ColorMagnitude and the star formation main sequence
diagrams. Taking into account their relative distribution in terms of the
stellar metallicity and oxygen gas abundance and a rough estimation of their
molecular gas content, we consider that these galaxies are in the process of
halting/quenching the star formation, in an actual transition between both
groups. The analysis of the radial distributions of the starformation rate,
specific star-formation rate, and molecular gas density shows that the
quenching happens from inside-out involving both a decrease of the efficiency
of the star formation and a deficit of molecular gas. All the intermediate
data-products used to derive the results of our analysis are distributed in a
database including the spatial distribution and average properties of the
stellar populations and ionized gas, published as a Sloan Digital Sky Survey
Value Added Catalog being part of the 14th Data Release:
http://www.sdss.org/dr14/manga/manga-data/manga-pipe3d-value-added-catalog/Comment: 48 pages, 14 figures, in press in RMxA
The M_BH - M_star relation for X-ray obscured, red QSOs at 1.2< z <2.6
We present near-infrared spectra, obtained with SINFONI and XShooter
observations at ESO VLT, of nine dusty, red QSOs at 1.2<z<2.6. The sources are
hard X-ray detected, characterized by cold absorption (N_H>10^{21} - 10^{22}
cm^{-2}) and show a broad Ha component in the NIR spectra. We complement this
sample with twelve additional sources taken from the literature with similar
properties resulting in a total sample of 21 X-ray obscured, intermediate type
(1.8-1.9), dusty reddened QSOs. From the broad Ha line we have computed the BH
masses through the virial formula and derived Eddington ratios. Moreover, from
optical/IR multi-component SED fitting we have derived the stellar mass of
their host galaxies and their SFRs. We find that most of the sources in our
sample are hosted in starburst and main sequence star-forming galaxies with
Eddington ratios lambda>0.1. We find a strong trend with the BH mass i.e. less
massive objects are scattered below and above the local relation while the most
massive ones are mainly located above it. We also studied the evolution of
these sources on the M_BH-M_star plane compared to a sample of optically blue
type--1 QSOs and we find that obscured red QSOs show a ratio of M_BH to M_star
that increases with redshift which is consistent with or slightly lower than
what has been found for blue QSOs. These sources may represent the blow-out
phase at the end of the rapid BH growth and immediately preceding the classical
blue QSOs typically sampled in optical surveys. They in fact show evidence of
outflows in the ionized gas component, but their BH has already fully formed.Comment: 17 pages, 7 figures accepted for publication in MNRAS in MNRA
The rest-frame ultraviolet properties of radio-loud broad absorption line quasars
We recently presented radio observations of a large sample of radio-loud
broad absorption line (BAL) quasars from the SDSS and FIRST surveys, as well as
a well matched sample of unabsorbed quasars, primarily to measure their radio
spectral indices and estimate ensemble orientations. Here, we analyze the SDSS
spectra of these samples and compare the rest-frame ultraviolet properties of
radio-loud BAL and non-BAL quasars. Ultraviolet properties include the
continuum shape, emission-line measurements of C IV, Al III, C III], Fe II, and
Mg II, and BAL properties including the balnicity index (BI), absorption index
(AI), and minimum and maximum outflow velocities. We find that radio-loud BAL
quasars have similar ultraviolet properties compared to radio-loud non-BAL
sources, though they do appear to have redder continua and stronger Fe II
emission, which is consistent with what is found for radio-quiet BAL sources.
No correlations exist between outflow properties and orientation (radio
spectral index), suggesting that BAL winds along any line of sight are driven
by the same mechanisms. There are also few correlations between spectral index
and other properties. We conclude that BAL outflows occur along all lines of
sight with similar strengths and velocities.Comment: Accepted for publication in MNRAS. Tables 1 and 2 will be published
in full with the final online publicatio
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