352 research outputs found
Translation of Musaev, M. A., A. M. Surkova, Ya. Ya. Elchiev, and F. K. Alieva. 1966. A new species of coccidium of the genus \u3ci\u3eEimeria\u3c/i\u3e from the domestic duck, \u3ci\u3eAnas domestica\u3c/i\u3e [= Novyi vid koktsidii iz roda \u3ci\u3eEimeria\u3c/i\u3e ot domasnie utki, \u3ci\u3eAnas domestica\u3c/i\u3e. \u3ci\u3eIzvest. Akademie Nauk Azerbaid. SSR\u3c/i\u3e, Otdel. Ottisk, Baku, USSR 1966(3): 34-36
No full textTranslation number 17, College of Veterinary Medicine, University of Illinois, Urbana, Illinois, United States, October 13, 1969 (5 pages)
Translation of Musaev, M. A., A. M. Surkova, Ya. Ya. Elchiev, and F. K. Alieva. 1966. A new species of coccidium of the genus Eimeria from the domestic duck, Anas domestica [= Novyi vid koktsidii iz roda Eimeria ot domasnie utki, Anas domestica. Izvest. Akademie Nauk Azerbaid. SSR, Otdel. Ottisk, Baku, USSR 1966(3): 34-36
Translation from Russian to English by Frederick K. Plous, Jr., and edited by Norman D. Levine (notated NDL:cml
Paper sensors for advanced smart packaging: route to detection on the shelf and in real ambient
No full textSmart packaging technologies have been increasingly developed to monitor and control food spoilage, ensuring food safety and quality throughout the supply chain. In this work we consider a flexible, low cost sensor based on hygroscopic properties of cellulose fibers for the detection of water-soluble gases produced from the degradation of amino acids in protein rich food like fish and meat. Ammonia and ammonia-related compounds such as dimethylamine and trimethylamine have gained increasing attention as volatile markers of the spoilage process, but, owing to the complexity of a food matrix, technology validation requires testing with odors released by food samples instead of individual or a few marker compounds. Here we realized carbon electrodes by Aerosol Jet Printing, with subsequent annealing at room temperature by flash lamp annealing, necessary to avoid cellulose substrate damaging. Subsequently, the sensors were tested in real environment with codfish fillet and cross-checked with conventional microbiological tests to assess the reaching of edibility threshold of the fish at room temperature. The sensors lodged in the food package were compared with sensors lodged in the reference package containing distilled water. The developed technology confirmed that it is possible to monitor fish degradation along the reaching and overpassing of the edibility threshold (mean sensors’ relative response is 50% at 107CFU/g) after 11 hours at 25°C, with a low-cost disposable device that can be integrated into food packaging
Theoretical predictions and single-crystal neutron diffraction and inelastic neutron scattering studies on the reaction of dihydrogen with the dinuclear dinitrogen complex of zirconium [P2N2]Zr(mu-eta(2)-N-2)Zr[P2N2], P2N2=PhP(CH2SiMe2NSiMe2CH2)(2)PPh
No full textA single-crystal neutron diffraction analysis along with density functional calculations and incoherent inelastic neutron scattering studies has conclusively shown that the dihydrogen adduct of [P2N2]Zr(mu-eta(2)-N-2)Zr[P2N2] (1) (where P2N2 = PhP(CH2SiMe2NSiMe2CH2)(2)PPh) is [P2N2]Zr(mu-eta(2)-N2H)(mu-H)Zr[P2N2] (2), the complex with a bridging hydride and a N-N-H moiety, and not the dihydrogen complex [P2N2]Zr(mu-eta(2)-N-2)(mu-eta(2)-H-2)Zr[P2N2] (3), as was proposed on the basis of X-ray crystallographic data. In addition, DFT calculations show that the reaction of 1 with both H-2 and SiH4 is exothermic while an endothermic reaction is found for the reaction of 1 with CH4
U-dualities in Type II string theories and M-theory.
No full textPhDIn this thesis the recently developed duality covariant approach to string and Mtheory
is investigated. In this formalism the U-duality symmetry of M-theory or Tduality
symmetry of Type II string theory becomes manifest upon extending coordinates
that describe a background.
The effective potential of Double Field Theory is formulated only up to a boundary
term and thus does not capture possible topological effects that may come from a
boundary. By introducing a generalised normal we derive a manifestly duality covariant
boundary term that reproduces the known Gibbons-Hawking action of General Relativity,
if the section condition is imposed. It is shown that the full potential can be
represented as a sum of the scalar potential of gauged supergravity and a topological
term that is a full derivative. The latter is written totally in terms of the geometric
flux and the non-geometric Q-flux integrated over the doubled torus.
Next we show that the Scherk-Schwarz reduction of M-theory extended geometry
successfully reproduces known structures of maximal gauged supergravities. Local symmetries
of the extended space defined by a generalised Lie derivatives reduce to gauge
transformations and lead to the embedding tensor written in terms of twist matrices.
The scalar potential of maximal gauged supergravity that follows from the effective potential
is shown to be duality invariant with no need of section condition. Instead, this
condition, that assures the closure of the algebra of generalised diffeomorphisms, takes
the form of the quadratic constraints on the embedding tensor
Neon abundances in mercury-manganese stars: Radiative accelerators and non-LTE calculations
No full textWe make new non-local thermodynamic equilibrium calculations to deduce the abundances of neon from visible-region echelle spectra of selected Ne i lines in seven normal stars and 20 HgMn stars. We find that the best strong blend-free Ne line that can be used at the lower end of the effective temperature Teff range is λ6402, although several other potentially useful Ne i lines are found in the red region of the spectra of these stars. The mean neon abundance in the normal stars (log A=8.10) is in excellent agreement with the standard abundance of neon (8.08). However, in HgMn stars neon is almost universally underabundant, ranging from marginal deficits of 0.1–0.3 dex to underabundances of an order of magnitude or more. In many cases, the lines are so weak that only upper limits can be established. The most extreme example found is υ Her with an underabundance of at least 1.5 dex. These underabundances are qualitatively expected from radiative acceleration calculations, which show that Ne has a very small radiative acceleration in the photosphere, and that it is expected to undergo gravitational settling if the mixing processes are sufficiently weak and there is no strong stellar wind. According to theoretical predictions, the low Ne abundances place an important constraint on the intensity of such stellar winds, which must be less than 10−14 M⊙ yr−1 if they are non-turbulent
Reactivity of Ebtellur Derivatives with the Peroxynitrite Anion: Comparison with Their Ebselen Analogues
No full textThe mechanism of the reaction of an ebtellur derivative 2_Te, [1,2-benzisotellurazol-3(2H)-one], with
peroxynitrite anion, ONOO- (PN), was studied at the density functional (B3LYP) level using triple-ζ quality
basis sets. It was shown that the reaction proceeds via the pathway 2_Te + PN → 2_Te−PN → 2_Te-TS1
(O−O activ) → 2_Te−O(NO2-). From the intermediate 2_Te−O(NO2-) it splits into two distinct pathways,
NO2- dissociation leading to 2_Te−O + NO2- and NO3- formation via the transition state 2_Te-TS2.
These two pathways proceed with ΔH = 36.6 (ΔG = 25.9) and 26.6 (26.9) kcal/mol energy loss, respectively.
The inclusion of the strongest electron-withdrawing substituent, R = CF3, creating complex 4_Te, effectively
pushes the reaction toward the peroxynitrite → nitrate isomerization in the gas phase. The comparison of
these data with our previous results (Musaev, D. G.; Geletii, Y. A.; Hill, G.; Hirao, K. J. Am. Chem. Soc.
2003, 125, 3877) on the reaction of ebselen derivatives with PN indicates that the probability of peroxynitrite
→ nitrate isomerization is higher for ebtellur than ebselen derivatives in the gas phase. It is predicted that the
ebselen and ebtellur derivatives with nonexistent (or weak) M−N2 bonds will be more active in the steps of
PN coordination, O−O bond cleavage, and nitrate formation. Meanwhile, the ebselen and ebtellur derivatives
with strong M−N2 bonds are predicted to be useful for NO2- dissociation and selenoxide formation. The
inclusion of solvent effects at the polarizable continuum model (PCM) level makes the reaction 2_Te + PN
more facile and stabilizes the NO2- dissociation pathway over the nitrate formation one. It makes the
peroxynitrite ↔ nitrate isomerization practically impossible
Enhancement of Magnetoelectric Effect in Layered Polymer Composites by Zn2+ and Ni2+ Substitution in CoFe2O4 Nanoparticles
No full textTwo-layered structures consisting of piezopolymer and magnetic elastomer were investigated as magnetoelectric material. Three types of magnetic elastomer based on cobalt ferrite (CoFe2O4) and Ni- or Zn-substituted CoFe2O4 nanoparticles were used as magnetically sensitive layers. Cobalt ferrite nanoparticles are considered one of the most promising metal-oxide nanomaterials because of their favorable magnetic properties, such as high saturation magnetization and magnetic anisotropy. The substitution of Co2+ in cobalt ferrite with other transition metals allows for additional tailoring of these properties. The modified magnetic behavior of the substituted CoFe2O4 nanoparticles directly influenced the magnetic properties of magnetic elastomers and, consequently, the magnetoelectric response of composite structures. In this case, the resonant frequency of the magnetoelectric effect remained largely independent of the type of magnetic nanoparticles in the magnetic elastomer layer but its magnitude increased upon Zn substitution up to ~107 mV·cm−1·Oe−1. These findings highlight the potential of chemically engineered magnetic properties of CoFe2O4 nanoparticles for manufacturing magnetoelectric composites to expand their applications in energy harvesting and sensors
InAs Nanowire-Based Twin Electrical Sensors Enabling Simultaneous Gas Detection
No full textEpitaxially grown InAs NWs are relevant for electrical sensing applications due to the Fermi level pinning at the NW surface and are highly sensitive to the surrounding environment. While a single NW growth batch consists of millions of virtually identical replicas of the same NW, real samples display subtle differences in NW size, shape, and structure, which may affect detection performance. Here, electrical gas detection is investigated in two nominally identical or twin devices fabricated starting from the same NW growth batch. Two individual wurtzite InAs NWs are placed onto a fabrication substrate at a 2 mu m distance with a 90 degrees relative orientation, each NW is electrically contacted, and the nanodevices are exposed to humidity and NO2 flux diluted in synthetic air. Electrical signal versus time is measured simultaneously in each nanodevice upon exposure to different gases and concentrations. The observed detection limit is 2 ppm for NO2 and 20% for relative humidity. Correlation analysis methods are exploited by calculating autocorrelation and cross-correlation functions for the experimental signal pairs, indicating lack of cross-correlation in the signal noise of the two nanodevices, suggesting that signal differences between the twins could be ascribed mainly to nonidealities in the fabrication protocol and nanoscopic differences in the two nanostructures, rather than to different environmental conditions. While InAs nanowires are used here as demonstrators of simultaneous gas sensing, the approach is general and virtually applies to any nanoscale material suitable for the realization of two-terminal electronic devices
Agenesis of the putamen and globus pallidus caused by recessive mutations in the homeobox gene GSX2
No full textBasal ganglia are subcortical grey nuclei that play essential roles in controlling voluntary movements, cognition and emotion. While basal ganglia dysfunction is observed in many neurodegenerative or metabolic disorders, congenital malformations are rare. In particular, dysplastic basal ganglia are part of the malformative spectrum of tubulinopathies and X-linked lissencephaly with abnormal genitalia, but neurodevelopmental syndromes characterized by basal ganglia agenesis are not known to date. We ascertained two unrelated children (both female) presenting with spastic tetraparesis, severe generalized dystonia and intellectual impairment, sharing a unique brain malformation characterized by agenesis of putamina and globi pallidi, dysgenesis of the caudate nuclei, olfactory bulbs hypoplasia, and anomaly of the diencephalic-mesencephalic junction with abnormal corticospinal tract course. Whole-exome sequencing identified two novel homozygous variants, c.26C>A; p.(S9*) and c.752A>G; p.(Q251R) in the GSX2 gene, a member of the family of homeobox transcription factors, which are key regulators of embryonic development. GSX2 is highly expressed in neural progenitors of the lateral and median ganglionic eminences, two protrusions of the ventral telencephalon from which the basal ganglia and olfactory tubercles originate, where it promotes neurogenesis while negatively regulating oligodendrogenesis. The truncating variant resulted in complete loss of protein expression, while the missense variant affected a highly conserved residue of the homeobox domain, was consistently predicted as pathogenic by bioinformatic tools, resulted in reduced protein expression and caused impaired structural stability of the homeobox domain and weaker interaction with DNA according to molecular dynamic simulations. Moreover, the nuclear localization of the mutant protein in transfected cells was significantly reduced compared to the wild-type protein. Expression studies on both patients' fibroblasts demonstrated reduced expression of GSX2 itself, likely due to altered transcriptional self-regulation, as well as significant expression changes of related genes such as ASCL1 and PAX6. Whole transcriptome analysis revealed a global deregulation in genes implicated in apoptosis and immunity, two broad pathways known to be involved in brain development. This is the first report of the clinical phenotype and molecular basis associated to basal ganglia agenesis in humans
Exotic branes in Exceptional Field Theory: E <inf>7(7)</inf> and beyond
No full text© 2018, The Author(s). In recent years, it has been widely argued that the duality transformations of string and M-theory naturally imply the existence of so-called ‘exotic branes’ — low codimension objects with highly non-perturbative tensions, scaling as gsα for α ≤ −3. We argue that their intimate link with these duality transformations make them an ideal object of study using the general framework of Double Field Theory (DFT) and Exceptional Field Theory (EFT) — collectively referred to as ExFT. Parallel to the theme of dualities, we also stress that these theories unify known solutions in string- and M-theory into a single solution under ExFT. We argue that not only is there a natural unifying description of the lowest codimension objects, many of these exotic states require this formalism as a consistent supergravity description does not exist
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