Lithium superionic conductor Li9.42Si1.02P2.1S9.96O2.04 with Li10GeP2S12-type structure in the Li2S–P2S5–SiO2 pseudoternary system: Synthesis, electrochemical properties, and structure–composition relationships

Directory of Open Access Journals (Sweden)

Satoshi Hori

2016-12-01

Full Text Available Lithium superionic conductors with the Li10GeP2S12 (LGPS-type structure are promising materials for use as solid electrolytes in next-generation lithium batteries. A novel member of the LGPS family, Li9.42Si1.02P2.1S9.96O2.04, and its solid solutions were synthesised by quenching from 1273 K in the Li2S–P2S5–SiO2 pseudoternary system. The material exhibited an ionic conductivity as high as 3.2×10−4 S cm−1 at 298 K, as well as the high electrochemical stability to lithium metal, which was improved by the introduction of oxygen into the LGPS-type structure. An all-solid-state cell with a lithium metal anode and Li9.42Si1.02P2.1S9.96O2.04 as the separator showed excellent performance with a high coulomb efficiency of 100%. Thus, oxygen doping is an effective way of improving the electrochemical stability of LGPS-type structure.

1s2p resonant inelastic x-ray scattering in a-Fe2O3

NARCIS (Netherlands)

Caliebe, W.A.; Kao, C.-C.; Hastings, J.B.; Taguchi, M.; Kotani, A.; Uozumi, T.; Groot, F.M.F. de

1998-01-01

We report experimental and theoretical results on the Fe K edge x-ray absorption spectrum and 1s2p resonant inelastic x-ray scattering (RIXS) spectra in a-Fe2O3 . The results are interpreted using an FeO6^9- cluster model with intra-atomic multiplet coupling and interatomic covalency

Iron 1s X-ray photoemission of Fe2O3

NARCIS (Netherlands)

Miedema, P. S.; Borgatti, F.; Offi, F.; Panaccione, G.; de Groot, F. M. F.

We present the Is X-ray photoemission spectrum of alpha-Fe2O3 in comparison with its 2p photoemission spectrum. We show that in case of transition metal oxides, because the 1s core hole is not affected by core hole spin-orbit coupling and almost not affected by core-valence multiplet effects, the Fe

Poly[di-μ-aqua-diaquabis(μ7-oxalato-κ9O1:O1:O1,O2:O2:O2′:O2′,O1′:O1′calciumdicaesium

Directory of Open Access Journals (Sweden)

Hamza Kherfi

2013-09-01

Full Text Available In the title compound, [CaCs2(C2O42(H2O4]n, the Ca2+ ion, lying on a twofold rotation axis, is coordinated by four O atoms from two oxalate ligands and two bridging water molecules in an octahedral geometry. The Cs+ ion is coordinated by seven O atoms from six oxalate ligands, one bridging water and one terminal water molecule. The oxalate ligand displays a scarce high denticity. The structure contains parallel chain units runnig along [10-1], formed by two edge-sharing Cs polyhedra connected by CsO9 polyhedra connected by a face-sharing CaO6 octahedron. These chains are further linked by the oxalate ligands to build up a three-dimensional framework. O—H...O hydrogen bonds involving the water molecules and the carboxylate O atoms enhance the extended structure.

Raman Spectroscopy evidence of 1:1:1 complex formation during dissolution of WO3 : K2SO4 in a melt of K2S2O7

DEFF Research Database (Denmark)

Berg, Rolf W.; Maijó Ferré, Irene

2005-01-01

The dissolution reaction of solid WO3 into a melt consisting of a 1:1 molar mixture of K2S2O7 and K2SO4 was studied by Raman spectroscopy. It was found that a new compound was formed, dimeric K8[(WO2)2(m-SO4)2(SO4)4]. The assigned Raman spectrum is given. Extended abstract of Poster presented...

Diaqua-2κ2O-bis(μ-1-oxido-2-naphthoato-1:2κ3O1,O2:O2′;2:3κ3O2:O1,O2′-bis(1-oxido-2-naphthoato-1κ1O2,O2;3κ2O1,O2-hexapyridine-1κ2N,2κ2N,3κ2N-trimanganese(II/III pyridine disolvate dihydrate

Directory of Open Access Journals (Sweden)

Daqi Wang

2008-12-01

Full Text Available The title complex, [Mn3(C11H6O34(C5H5N6(H2O2]·2H2O·2C5H5N, is a trinuclear mixed oxidation state complex of overline1 symmetry. The three Mn atoms are six-coordinated in the shape of distorted octahedra, each coordinated with an O4N2 set of donor atoms, where the ligands exhibit mono- and bidentate modes. However, the coordination of the MnII ion located on the inversion centre involves water molecules at two coordination sites, whereas that of the two symmetry-related MnIII ions involves an O4N2 set of donor atoms orginating from the organic ligands. Intramolecular C—H...π interactions between neighbouring pyridine ligands stabilize this arrangement. A two-dimensional network parallel to (001 is formed by intermolecular O—H...O hydrogen bonds.

Lovastatin reduces neuronal cell death in hippocampal CA1 subfield after pilocarpine-induced status epilepticus: preliminary results Lovastatina reduz a lesão celular na região CA1 do hipocampo após o status epilepticus induzido pela pilocarpina: resultados preliminares

Directory of Open Access Journals (Sweden)

Pauline Rangel

2005-12-01

Full Text Available OBJECTIVE: To further characterize the capacity of lovastatin to prevent hippocampal neuronal loss after pilocarpine-induced status epilepticus (SE METHOD: Adult male Wistar rats were divided into four groups: (A control rats, received neither pilocarpine nor lovastatin (n=5; (B control rats, received just lovastatin (n=5; (C rats that received just pilocarpine (n=5; (D rats that received pilocarpine and lovastatin (n=5. After pilocarpine injection (350mg/kg, i.p., only rats that displayed continuous, convulsive seizure activity were included in our study. Seizure activity was monitored behaviorally and terminated with an injection of diazepam (10 mg/kg, i.p. after 4 h of convulsive SE. The rats treated with lovastatin received two doses of 20mg/kg via an oesophagic probe immediately and 24 hours after SE induction. Seven days after pilocarpine-induced SE, all the animals were perfused and their brains were processed for histological analysis through Nissl method. RESULTS: The cell counts in the Nissl-stained sections performed within the hippocampal formation showed a significant cell loss in rats that received pilocarpine and presented SE (CA1= 26.8 ± 13.67; CA3= 38.1 ± 7.2; hilus= 43.8 ± 3.95 when compared with control group animals (Group A: CA1= 53.2 ± 9.63; CA3= 63.5 ± 13.35; hilus= 59.08 ± 10.24; Group B: CA1= 74.3 ± 8.16; CA3= 70.1 ± 3.83; hilus= 70.6 ± 5.10. The average neuronal cell number of CA1 subfield of rats that present SE and received lovastatin (44.4 ± 17.88 was statically significant increased when compared with animals that just presented SE. CONCLUSION: Lovastatin exert a neuroprotective role in the attenuation of brain damage after SE.OBJETIVO: Capacidade da lovastatina em prevenir a perda de neurônios hipocampais após o status epilepticus (SE induzido pela pilocarpina. MÉTODO: Ratos adultos Wistar foram divididos em 4 grupos: (A ratos controles que não receberam pilocarpina nem lovastatina (n=5; (B ratos

Quenching of I(2P1/2) by O3 and O(3P).

Science.gov (United States)

Azyazov, Valeriy N; Antonov, Ivan O; Heaven, Michael C

2007-04-26

Oxygen-iodine lasers that utilize electrical or microwave discharges to produce singlet oxygen are currently being developed. The discharge generators differ from conventional chemical singlet oxygen generators in that they produce significant amounts of atomic oxygen. Post-discharge chemistry includes channels that lead to the formation of ozone. Consequently, removal of I(2P1/2) by O atoms and O3 may impact the efficiency of discharge driven iodine lasers. In the present study, we have measured the rate constants for quenching of I(2P1/2) by O(3P) atoms and O3 using pulsed laser photolysis techniques. The rate constant for quenching by O3, (1.8 +/- 0.4) x 10(-12) cm3 s-1, was found to be a factor of 5 smaller than the literature value. The rate constant for quenching by O(3P) was (1.2 +/- 0.2) x 10(-11) cm3 s-1.

Twiny pro: 5.1 kg of propane dressed in apple green; Twiny pro: 5.1 kg de propane en habillage vert pomme

Energy Technology Data Exchange (ETDEWEB)

Anon.

1998-05-01

Designed for professional and outdoors uses, Twini Pro - the new Primagaz 5.1 kg propane cylinder - is a complement to the Twiny butane 6 kg cylinder was launched during the first week of March in some 2,500 outlets, before 5,000 and 7,000 points later

ynthesis and Characterization of 1-Aryl-5-hepta-O-acetyl-β-D-maltosyl-2-S-benzyl-2,4-isodithiobiurets

Directory of Open Access Journals (Sweden)

R. D. Ghuge

2012-01-01

Full Text Available The facile synthesis of 1-aryl-5-hepta-o-acetyl-β-D-maltosyl-2-S-benzyl-2,4-isodithiobiurets (IIIa-g has been achieved by the interaction of 1-hepta-O-acetyl-β–D-maltosyl isothiocyanate (I with various1-aryl-S-benzyl isothiocarbamides (IIa-g. All the newly synthesized N-maltosylated compounds characterized by elemental analysis, IR, NMR and Mass spectral studies.

Perbandingan antara Tramadol 2 mg/kgBB dan Fentanil 2 mg/kgBB Intravena Sebagai Analgetik Intraoperatif pada Operasi Laparotomi Ginekologis; Pengaruhnya terhadap Skor PRST

Directory of Open Access Journals (Sweden)

Arief Kurniawan

2017-12-01

Full Text Available Perkembangan dan kemajuan teknologi serta ilmu pengetahuan telah mendorong pelaksanaan pelayanan kesehatan yang lebih efektif dan lebih ekonomis dibanding dengan cara yang lazim dikerjakan. Telah dilakukan penelitian terhadap 32 pasien operasi laparotomi ginekologis yang dibagi menjadi dua kelompok. Kelompok Tramadol (n=16 diberikan tramadol 2 mg/kgBB (pengenceran akuabides sampai 10 mL lewat jalur infus selama satu menit, sedangkan pada kelompok Fentanil (n=16 diberikan fentanil 2 µg/kgBB dengan cara yang sama. Lima menit kemudian diberikan propofol 2 mg/kgBB, atrakurium 0,5 mg/kgBB, enfluran 2 volume %, N2O:O2=2 L/menit:2 L/menit. Setelah tiga menit dilakukan laringoskopi intubasi. Pasien diventilasi kendali dengan mode ventilator IPPV. Operasi dilaksanakan bila kedalaman anestesi tercapai berdasar atas skor PRST (P=systolic arterial pressure, R=heart rate, S=sweat, dan T=tears 2 sampai dengan 4. Analgetik pertolongan 50 µg fentanil diberikan bila skor PRST lebih dari 4. Analgetik postoperatif 30 mg ketorolak dan antimuntah 10 mg metoklopramid diberikan saat jahit kulit. Pencatatan tekanan darah, laju nadi, saturasi O2, dan skor PRST dilakukan sebagai berikut: T0 = penderita tiba di kamar operasi, T1= preintubasi, T2= satu menit setelah intubasi, T3= satu menit setelah insisi, T4 dan seterusnya diukur tiap 15 menit sampai selesai operasi. Pasien diekstubasi setelah pernapasan adekuat. Skala sedasi dan muntah dinilai setiap 15 menit setelah ekstubasi selama dua jam. Dari hasil penelitian didapatkan skor PRST mulai T1 sampai T12 secara statistis tidak berbeda bermakna antara kelompok tramadol dan fentanil (p>0,05. Kedua kelompok mengalami peningkatan skor PRST satu menit setelah intubasi. Skor PRST dipertahankan antara 0 sampai 2. Pada kelompok tramadol dan fentanil masing-masing satu orang mendapatkan analgetik pertolongan fentanil 50 µg karena skor PRST 5. Tidak ditemukan perbedaan skala sedasi dan muntah antara dua kelompok perlakuan

The cocrystal μ-oxalato-κ4O1,O2:O1′,O2′-bis(aqua(nitrato-κO{[1-(2-pyridyl-κNethylidene]hydrazine-κN}copper(II μ-oxalato-κ4O1,O2:O1′,O2′-bis((methanol-κO(nitrato-κO{[1-(2-pyridyl-κNethylidene]hydrazine-κN}copper(II (1/1

Directory of Open Access Journals (Sweden)

Youssouph Bah

2008-09-01

Full Text Available The title cocrystal, [Cu2(C2O4(NO32(C7H9N32(H2O2][Cu2(C2O4(NO32(C7H9N32(CH4O2], is a 1:1 cocrystal of two centrosymmetric CuII complexes with oxalate dianions and Schiff base ligands. In each molecule, the CuII centre is in a distorted octahedral cis-CuN2O4 environment, the donor atoms of the N,N′-bidentate Schiff base ligand and the bridging O,O′-bidentate oxalate group lying in the equatorial plane. In one molecule, a monodentate nitrate anion and a water molecule occupy the axial sites, and in the other, a monodentate nitrate anion and a methanol molecule occupy these sites. In the crystal structure, intermolecular N—H...O, O—H...O and N—H...N hydrogen bonds link the molecules into a network. Weak intramolecular N—H...O interactions are also observed.

Three-dimensional contrast-enhanced magnetic-resonance angiography of the renal arteries: Interindividual comparison of 0.2 mmol/kg gadobutrol at 1.5 T and 0.1 mmol/kg gadobenate dimeglumine at 3.0 T

International Nuclear Information System (INIS)

Attenberger, Ulrike I.; Wintersperger, Bernd J.; Sourbron, Steven P.; Reiser, Maximilian F.; Michaely, Henrik J.; Schoenberg, Stefan O.; Lodemann, Klaus-Peter

2008-01-01

The purpose was to evaluate the image quality of high-spatial resolution MRA of the renal arteries at 1.5 T after contrast-agent injection of 0.2 mmol/kg body weight (BW) in an interindividual comparison to 3.0 T after contrast-agent injection of 0.1 mmol/kg BW contrast agent (CA). After IRB approval and informed consent, 40 consecutive patients (25 men, 15 women; mean age 53.9 years) underwent MRA of the renal arteries either at a 1.5-T MR system with 0.2 mmol/kg BW gadobutrol or at a 3.0-T MR scanner with 0.1 mmol/kg BW gadobenate dimeglumine used as CA in a randomized order. A constant volume of 15 ml of these contrast agents was applied. The spatial resolution of the MRA sequences was 1.0 x 0.8 x 1.0 mm 3 at 1.5 T and 0.9 x 0.8 x 0.9 mm 3 at 3.0 T, which was achieved by using parallel imaging acceleration factors of 2 at 1.5 T and 3 at 3.0 T, respectively. Two radiologists blinded to the administered CA and the field strength assessed the image quality and the venous overlay for the aorta, the proximal and distal renal arteries independently on a four-point Likert-type scale. Phantom measurements were performed for a standardized comparison of SNR at 1.5 T and 3.0 T. There was no significant difference (p > 0.05) between the image quality at 3.0 T with 0.1 mmol/kg BW gadobenate dimeglumine compared to the exams at 1.5 T with 0.2 mmol/kg BW gadobutrol. The median scores were between 3 and 4 (good to excellent vessel visualization) for the aorta (3 at 1.5 T/4 at 3.0 T for reader 1 and 2). For the proximal renal arteries, median scores were 3 for the left and right renal artery at 1.5 T for both readers. At 3.0 T, median scores were 3 (left proximal renal artery) and 4 (right proximal renal artery) for reader 1 and 3 (left/right) for reader 2 at 3.0 T. For the distal renal arteries, median scores were between 2 and 3 at both field strengths (moderate and good) for both readers. The κ values for both field strengths were comparable and ranged between 0

Three-dimensional contrast-enhanced magnetic-resonance angiography of the renal arteries: Interindividual comparison of 0.2 mmol/kg gadobutrol at 1.5 T and 0.1 mmol/kg gadobenate dimeglumine at 3.0 T

Energy Technology Data Exchange (ETDEWEB)

Attenberger, Ulrike I.; Wintersperger, Bernd J.; Sourbron, Steven P.; Reiser, Maximilian F. [University Hospitals-Grosshadern, Ludwig-Maximilians-University Munich, Institute of Clinical Radiology, Munich (Germany); Michaely, Henrik J.; Schoenberg, Stefan O. [University Hospital Mannheim, University of Heidelberg, Institute of Clinical Radiology, Mannheim (Germany); Lodemann, Klaus-Peter [Bracco-Altana Pharma, Konstanz (Germany)

2008-06-15

The purpose was to evaluate the image quality of high-spatial resolution MRA of the renal arteries at 1.5 T after contrast-agent injection of 0.2 mmol/kg body weight (BW) in an interindividual comparison to 3.0 T after contrast-agent injection of 0.1 mmol/kg BW contrast agent (CA). After IRB approval and informed consent, 40 consecutive patients (25 men, 15 women; mean age 53.9 years) underwent MRA of the renal arteries either at a 1.5-T MR system with 0.2 mmol/kg BW gadobutrol or at a 3.0-T MR scanner with 0.1 mmol/kg BW gadobenate dimeglumine used as CA in a randomized order. A constant volume of 15 ml of these contrast agents was applied. The spatial resolution of the MRA sequences was 1.0 x 0.8 x 1.0 mm{sup 3} at 1.5 T and 0.9 x 0.8 x 0.9 mm{sup 3} at 3.0 T, which was achieved by using parallel imaging acceleration factors of 2 at 1.5 T and 3 at 3.0 T, respectively. Two radiologists blinded to the administered CA and the field strength assessed the image quality and the venous overlay for the aorta, the proximal and distal renal arteries independently on a four-point Likert-type scale. Phantom measurements were performed for a standardized comparison of SNR at 1.5 T and 3.0 T. There was no significant difference (p > 0.05) between the image quality at 3.0 T with 0.1 mmol/kg BW gadobenate dimeglumine compared to the exams at 1.5 T with 0.2 mmol/kg BW gadobutrol. The median scores were between 3 and 4 (good to excellent vessel visualization) for the aorta (3 at 1.5 T/4 at 3.0 T for reader 1 and 2). For the proximal renal arteries, median scores were 3 for the left and right renal artery at 1.5 T for both readers. At 3.0 T, median scores were 3 (left proximal renal artery) and 4 (right proximal renal artery) for reader 1 and 3 (left/right) for reader 2 at 3.0 T. For the distal renal arteries, median scores were between 2 and 3 at both field strengths (moderate and good) for both readers. The {kappa} values for both field strengths were comparable and ranged

Escape of O(3P), O(1D), and O(1S) from the Martian atmosphere

Science.gov (United States)

Fox, Jane L.; Hać, Aleksander B.

2018-01-01

We have computed here the escape probabilities, fluxes and rates for hot O atoms that are initially produced in the ground state and the first two excited metastable states, O(1D)and O(1S), in the Martian thermosphere by dissociative recombination of O2+. In order to compare our results with those of our previous calculations and with those of others, we have employed here the pre-MAVEN models that we have used previously. To compute the escape probabilities, we have employed the Monte Carlo escape code that has been described previously, but we here use for the first time energy-dependent elastic cross sections for collisions of the energetic O atoms with each of the twelve background species in our model. We also incorporate three mechanisms that interchange identities of the O(3P) and O(1D) atoms, including collisional excitation of O(3P) to O(1D), quenching of O(1D) to O(3P), and excitation exchange of O(1D) with O(3P). We find that the escape probabilities of O atoms that are produced initially as O(1D) are reduced compared to those in which these processes are not included, but the escape probabilities of O atoms that are initially produced as O(3P) are not significantly reduced. As a guide for our future research and those of other investigators, we review here what is known about the interactions of O atoms with other species in which the energies of the O atoms are altered, and several other sources of hot and escaping O, many of which have been suggested by other investigators. We will incorporate these data in a future MAVEN-like model.

Crystal structure of (1S,2R-2-hydroxy-1,2-diphenylethan-1-aminium (S-2-azaniumylbutanedioate monohydrate

Directory of Open Access Journals (Sweden)

Isao Fujii

2017-12-01

Full Text Available The title diastereomeric salt, formed between 2-amino-1,2-diphenylethanol (ADE and aspartic acid (ASP, C14H16NO+·C4H6NO4−·H2O, crystallizes as a monohydrate. The 1,2-diphenylethyl group in the cation has a cis conformation, and the aspartic acid anion is in the zwitterionic form. In the crystal, the ASP anions are linked via N—H...O hydrogen bonds to form a 21 helix along the b-axis direction. The helices are linked by the ADE cations via O—H...O and N—H...O hydrogen bonds, forming layers parallel to the bc plane. There are channels in the layers that are occupied by water molecules, which link to both the anions and cations via Owater—H...O and N—H...Owater hydrogen bonds. There are also C—H...O and C—H...π interactions present within the layers.

Kinetic study of Ca({sup 1}S) + N{sub 2}O and Sr({sup 1}S) + N{sub 2}O reactions in the temperature ranges of, respectively, 303--1015 and 303--999 K

Energy Technology Data Exchange (ETDEWEB)

Vinckier, C.; Helaers, J.; Remeysen, J. [K.U. Leuven, Heverlee (Belgium). Dept. of Chemistry

1999-07-08

Metal/N{sub 2}O reactions in incinerators may reduce the emission of the greenhouse gas N{sub 2}O. The study of metal atom/N{sub 2}O reactions allows metal atom/N{sub 2}O reactions in the gas phase to be very exothermic, leading to product molecules being formed in an electronic excited state. When the metal oxides fall back to lower lying states, an intense chemiluminescence can occur. In this way such reactions can be suitable candidates for the development of chemical lasers in which the population inversion is obtained by means of a pure chemical reaction. A kinetic study of the second-order reactions Ca({sup 1}S) + N{sub 2}O(X{sup 1}{Sigma}{sup +}) {yields} CaO + N{sub 2} and Sr({sup 1}S) + N{sub 2}O(X{sup 1}{Sigma}{sup +}) {yields} SrO + N{sub 2} has been carried out in a fast-flow reactor in the temperature ranges of, respectively, 303--1015 and 303--999 K. The alkaline earth metal atoms were thermally generated from the solid metal pellets. Their decays as a function of the added N{sub 2}O concentration were followed by means of atomic absorption spectroscopy (AAS) at 422.7 nm for calcium and 460.7 nm for strontium atoms. Both reactions showed a non-Arrhenius behavior that can best be explained by the presence of two reaction product channels, resulting in a rate constant expressed as the sum of two exponential functions. The best fits over the entire temperature range are given by polynomial expressions. The results will be discussed in view of the literature data on the alkaline earth metal atom + N{sub 2}O reactions. The experimentally derived energy barriers will be compared with the calculated values on the basis of the semiempirical configuration interaction theory (SECI). Reasonably good correlations were obtained between the barrier heights of the reaction and the promotion energy of the metals involved.

Reliable measurement of the Li-like 2248Ti 1s2s2p 4P5/2o level lifetime by beam-foil and beam-two-foil experiments

International Nuclear Information System (INIS)

Nandi, T.; Ahmad, Nissar; Wani, A. A.; Marketos, P.

2006-01-01

We have determined the lifetime of the Li-like 22 48 Ti 1s2s2p 4 P 5/2 o level (210.5±13.5 ps) using data from its x-ray decay channel through beam single- and two-foil experiments, coupled to a multicomponent iterative growth and decay analysis. Theoretical lifetime estimates for this zero-nuclear-spin ion lies within the uncertainty range of our experimental results, indicating that blending contributions to this level from the He-like 1s2p 3 P 2 o and 1s2s 3 S 1 levels are eliminated within the current approach. A previously reported discrepancy between experimental and theoretical 1s2s2p 4 P 5/2 o level lifetimes in 23 51 V may, as a result, be attributed to hyperfine quenching

[Pharmacology of a new sleep inducer, 1H-1,2,4-triazolyl benzophenone derivative, 450191-S (II). Sleep-inducing activity and effect on the motor system].

Science.gov (United States)

Yamamoto, K; Matsushita, A; Sawada, T; Naito, Y; Yoshimura, K; Takesue, H; Utsumi, S; Kawasaki, K; Hirono, S; Koshida, H

1984-07-01

The sleep-inducing activity and effect on the motor system of the 1H-1,2,4-triazolyl benzophenone derivative 450191-S were examined behaviorally, electroencephalographically and electro-physiologically with various species of animals and were compared with those of diazepam, nitrazepam, estazolam and triazolam. In the rhesus monkey, rabbit and rat with chronically indwelling brain electrodes, 0.6 to 3 mg/kg, p.o. of 450191-S caused a shorter latency of sleep onset, an increase of and a stable continuity of slow wave deep sleep (SWDS) with higher amplitude, and the appearance of clear spindle bursts in the slow wave light sleeping (SWLS) state with little muscle relaxation. Animals treated with nitrazepam and/or estazolam showed a smaller increase in SWDS and its unstable continuity with remarkable disturbance of gait. The doses needed to induce sleep in the rhesus monkey were 0.6 to 1 mg/kg p.o. for 450191-S, 3 mg/kg for nitrazepam, 1 mg/kg for estazolam and 0.3 mg/kg for triazolam. The cat treated with 450191-S showed the phenomena caused by benzodiazepines (BDZ), i.e., behavioral excitation and decrease of frequencies in the hippocampal theta waves. The suppressive effects of 450191-S on the EEG arousal reaction and/or blood pressure elevation induced by hypothalamic stimulation in the rabbit suggested that the inhibitory effects acted on the posterior hypothalamus to the limbic system. The inhibitory effect of 450191-S on the amygdaloid kindling in the rat was as potent as those of diazepam and nitrazepam. Successive daily oral administration of both 3 mg/kg of 450191-S and/or 3 to 6 mg/kg of nitrazepam for 15 days in the rabbit caused slight decrease of SWDS and increase of fast wave (REM) sleep (FWS). During the withdrawal period of both compounds, a slight but insignificant increase in the waking state was noticed for 1 to 2 days, but not a rebound increase of FWS. Intravenously administered 450191-S showed the same action as BDZ on the spinal reflex and the

Hydrates of the alkali trioxidomonosulfidomolybdates and -tungstates. K{sub 2}[(Mo/W)O{sub 3}S] . 1.5 H{sub 2}O and (Rb/Cs){sub 2}[(Mo/W)O{sub 3}S] . H{sub 2}O

Energy Technology Data Exchange (ETDEWEB)

Lehner, Anna J.; Braitsch, Milan; Roehr, Caroline [Freiburg Univ. (Germany). Inst. fuer Anorganische und Analytische Chemie

2012-11-01

The trioxidomonosulfidomolybdate and -tungstate anions [(Mo/W)O{sub 3}S]{sup 2-} are the first products formed when passing H{sub 2}S gas through a solution of the oxidometalates. Their potassium, rubidium and cesium salt hydrates form as crystalline precipitates from these solutions depending on pH, the polarity of the solvent, educt concentrations and temperature. The structures of the sesqui- (K) and mono- (Rb, Cs) hydrates have been determined by means of X-ray single crystal diffraction data. The potassium sesquihydrates K{sub 2}[(Mo/W)O{sub 3}S] . 1.5 H{sub 2}O are isotypic and crystallize with a new structure type (monoclinic, space group C2/c, M = Mo/W: a = 987.0(2)/993.13(11), b = 831.75(14)/831.10(11), c = 1868.9(4)/1865.2(2) pm, {beta} = 99.34(2)/99.153(8) , R1 = 0.0352/0.0390). In the crystal structure the [(Mo/W)O{sub 3}S]{sup 2-} anions are connected via hydrogen bonds to form columns along the c direction. Channels containing only water molecules run along the [101] direction. The dehydration process proceeds in a topotactic reaction between 60 to 95 C and yields crystals of the anhydrous salts K{sub 2}[(Mo/W)O{sub 3}S]. The two different K+ cations exhibit a 5 + 3 and 5 + 2 O/S coordination. The heavier alkali metal cations form the four monohydrates (Rb/Cs){sub 2}[(Mo/W)O{sub 3}S] . H{sub 2}O (trigonal rhombohedral, space group R anti 3m) with lattice parameters for the Rb/Cs molybdates of a = 621.17(6)/624.62(10), c = 3377.9(4)/3388.6(8) pm (R1 = 0.0505/0.0734) and the tungstates of a = 642.80(3)/643.3(4), c = 3532.8(3)/3566(4) pm (R1 = 0.0348/0.0660). In the structures the 3m symmetrical tetrahedra are arranged to form double layers in such a way, that the O{sub 3} bases of the tetrahedra are pointing towards each other in a staggered conformation. These double layers are stacked in the c direction in a rhombohedral sequence. In these hydrates, there are no distinct hydrogen bonds. Instead, partially disordered pairs of H{sub 2}O molecules are

Strain-Gated Field Effect Transistor of a MoS2-ZnO 2D-1D Hybrid Structure.

Science.gov (United States)

Chen, Libo; Xue, Fei; Li, Xiaohui; Huang, Xin; Wang, Longfei; Kou, Jinzong; Wang, Zhong Lin

2016-01-26

Two-dimensional (2D) molybdenum disulfide (MoS2) is an exciting material due to its unique electrical, optical, and piezoelectric properties. Owing to an intrinsic band gap of 1.2-1.9 eV, monolayer or a-few-layer MoS2 is used for fabricating field effect transistors (FETs) with high electron mobility and on/off ratio. However, the traditional FETs are controlled by an externally supplied gate voltage, which may not be sensitive enough to directly interface with a mechanical stimulus for applications in electronic skin. Here we report a type of top-pressure/force-gated field effect transistors (PGFETs) based on a hybrid structure of a 2D MoS2 flake and 1D ZnO nanowire (NW) array. Once an external pressure is applied, the piezoelectric polarization charges created at the tips of ZnO NWs grown on MoS2 act as a gate voltage to tune/control the source-drain transport property in MoS2. At a 6.25 MPa applied stimulus on a packaged device, the source-drain current can be tuned for ∼25%, equivalent to the results of applying an extra -5 V back gate voltage. Another type of PGFET with a dielectric layer (Al2O3) sandwiched between MoS2 and ZnO also shows consistent results. A theoretical model is proposed to interpret the received data. This study sets the foundation for applying the 2D material-based FETs in the field of artificial intelligence.

Polarity driven morphology of CeO2(1 0 0) islands on Cu(1 1 1)

International Nuclear Information System (INIS)

Stetsovych, O.; Beran, J.; Dvořák, F.; Mašek, K.; Mysliveček, J.; Matolín, V.

2013-01-01

Thin ceria films supported by metal substrates represent important model systems for reactivity studies in heterogeneous catalysis. Here we report the growth study of the polar CeO 2 (1 0 0) phase as part of a mixed CeO 2 (1 1 1)–CeO 2 (1 0 0) thin film supported by Cu(1 1 1). The two ceria phases grow on different areas of the substrate, what allows a reliable growth characterization of the CeO 2 (1 0 0) islands on Cu(1 1 1). Scanning tunneling microscopy measurements reveal CeO 2 (1 0 0) to grow in the form of highly dispersed three dimensional (3D) islands on a CeO 2 (1 0 0) interfacial layer. The CeO 2 (1 0 0) islands exhibit a 2 × 2 surface reconstruction. The presence of the surface reconstruction together with the highly dispersed growth of CeO 2 (1 0 0) islands corresponds to the requirement for compensation of the surface dipole moment on the CeO 2 (1 0 0). CeO 2 (1 0 0) islands are further characterized by reflection high energy electron diffraction yielding their epitaxial relations with respect to the Cu(1 1 1) substrate. The growth of well characterized CeO 2 (1 0 0) islands supported by Cu(1 1 1) represents a starting point for developing a novel template for structure-related reactivity studies of ceria based model catalysts.

Density of Na2O-Li2O-SiO2-B2O3 Molten Slag at 1 803-1 873 K

Institute of Scientific and Technical Information of China (English)

XIAO Feng; FANG Liang

2004-01-01

The density of three kinds of molten slags was measured by modified sessile drop method at 1 803-1 873 K. The density of molten slag is found to decrease with increasing temperature. The temperature coefficients of Na2O-Li2O-SiO2 and Li2O-SiO2-B2O3 slag are smaller than that of Na2O-B2O3 slag. The molar volume of slags increases with increasing temperature.

Synthesis of (R,S)-[2,3-13C2]-1-(1'-methyl-2'-pyrrolidinyl)propan-2-one; {(R,S)-[2',3'-13C2]hygrinePound right bracePound

International Nuclear Information System (INIS)

Abraham, T.W.; Leete, Edward

1996-01-01

2-Ethoxy-1-methyl-5-pyrrolidinone (1) was reacted with ethyl [3,4- 13 C 2 ]-acetoacetate (2) in the presence of TiCl 4 to give ethyl [3,4- 13 C 2 ]-2-(1'-methyl-5'-oxo-2'-pyrrolidinyl)-3-oxobutanoate (3) in 85% yield. Decarboethoxylation of ethyl [3,4- 13 C 2 ]-2-(1'-methyl-5'-oxo-2'-pyrrolidinyl)-3-oxobutan-oate (3) was accomplished using NaCl and H 2 O in DMSO to give (R,S)-[2,3- 13 C 2 ]-1-(1'-methyl-5'-oxo-2'-pyrrolidinyl)propan-2-o ne (4) in 91% yield. Protection of the ketone as a ketal (ethylene glycol, H + ), followed by reduction of the amide to the amine using LiAlH 4 and subsequent deprotection of the ketal gave (R,S)-[2,3- 13 C 2 ]-1-(1'-methyl-2'-pyrrolidinyl)propan-2-one ((R,s)-[2', 3'- 13 C 2 ]Hygrine) (8) in 78% yield. (61% overall yield from ethyl [3,4- 13 C 2 ]acetoacetate). (Author)

Preparation and electrical properties of (1 - x)Sr(Fe1/2Nb1/2)O3-xPbTiO3 ferroelectric ceramics

International Nuclear Information System (INIS)

Fang Bijun; Cheng Zhenquan; Sun Renbing; Ding Chenlu

2009-01-01

(1 - x)Sr(Fe 1/2 Nb 1/2 )O 3 -xPbTiO 3 (SFN-PT) ferroelectric ceramics were prepared by conventional solid-state reaction method via the wolframite precursor route. X-ray diffraction (XRD) measurement confirmed that the synthesized SFN-PT ceramics are of pure perovskite structure. With the increase of the concentration of PbTiO 3 (PT), crystal structure of the sintered SFN-PT ceramics changes from rhombohedral phase to tetragonal phase. Dielectric response of the SFN-PT ceramics changes from diffused and broad dielectric peaks to relatively sharp ones accompanied by the increase of the temperature of dielectric maximum (T m ). Small content of MnO 2 or Li 2 CO 3 doping can greatly decrease the dielectric loss of the SFN-PT ceramics, furthermore, the abnormal increase of dielectric constant and loss tangent in the paraelectric phase is suppressed accordingly. Typical P-E hysteresis loops are observed in the SFN-PT ceramics, however, the saturate polarization (P s ) is small. MnO 2 or Li 2 CO 3 doping can greatly decrease the coercive field (E c ) of the SFN-PT ceramics accompanied by large increase of P s . Piezoelectric constant d 33 of the SFN-PT ceramics is small except for SFN30-PT70 ceramics, which reaches 22pC/N

Controle químico de melão-de-são-caetano em área de cana-soca

Directory of Open Access Journals (Sweden)

Núbia Maria Correia

2010-01-01

Full Text Available Com o objetivo de estudar o efeito de herbicidas aplicados em pré e pós-emergência, isolados e em combinações nas épocas seca e úmida, para o controle de melão-de-são-caetano (Momordica charantia em área de cana-soca, desenvolveu-se um experimento no período de junho de 2007 a julho de 2008, na Fazenda Gabriela, no município de Bebedouro (SP. O delineamento experimental foi o de blocos ao acaso, com quatro repetições, em esquema de parcela subdividida. Nas parcelas foram estudados quatro tratamentos de herbicidas: imazapic (0,147 kg ha-1 e amicarbazone (1,4 kg ha-1, aplicados uma semana após a colheita da cana; clomazone mais hexazinone (0,8 kg ha-1 + 0,2 kg ha-1 e amicarbazone (1,4 kg ha-1, aplicados em agosto, aos 63 dias após a colheita da cana, pulverizados na época seca, além de tratamento sem aplicação. Nas subparcelas foram testadas as aplicações em pós-emergência de quatro tratamentos de herbicidas: mesotrione (0,192 kg ha-1, amicarbazone (1,4 kg ha-1, mesotrione mais amicarbazone (0,096 kg ha-1+ 0,7 kg ha-1 e 2,4-D (1,005 kg ha-1, na época úmida e a manutenção de tratamento sem herbicida. Para o controle de melão-de-são-caetano a aplicação de herbicidas na época úmida (período de chuvas é obrigatória e desnecessária na época seca. Os herbicidas mesotrione e amicarbazone, isolados ou em mistura, aplicados na época úmida são eficazes no controle em pós-emergência das plantas e na inibição de novos fluxos de emergência de melão-de-são-caetano na época úmida.

Lithium Superionic Conductor Li9.42Si1.02P2.1S9.96O2.04 with Li10GeP2S12-Type Structure in the Li2S–P2S5–SiO2 Pseudoternary System: Synthesis, Electrochemical Properties, and Structure–Composition Relationships

International Nuclear Information System (INIS)

Hori, Satoshi; Suzuki, Kota; Hirayama, Masaaki; Kato, Yuki; Kanno, Ryoji

2016-01-01

Lithium superionic conductors with the Li 10 GeP 2 S 12 (LGPS)-type structure are promising materials for use as solid electrolytes in the next-generation lithium batteries. A novel member of the LGPS family, Li 9.42 Si 1.02 P 2.1 S 9.96 O 2.04 (LSiPSO), and its solid solutions were synthesized by quenching from 1273 K in the Li 2 S–P 2 S 5 –SiO 2 pseudoternary system. The material exhibited an ionic conductivity as high as 3.2 × 10 −4 S cm −1 at 298 K, as well as the high electrochemical stability to lithium metal, which was improved by the introduction of oxygen into the LGPS-type structure. An all-solid-state cell with a lithium metal anode and LSiPSO as the separator showed excellent performance with a high reversibility of 100%. Thus, oxygen doping is an effective way of improving the electrochemical stability of LGPS-type structure.

Ionizing radiation effects on the KG1A primitive hematopoietic cell line

International Nuclear Information System (INIS)

Clave, Emmanuel; Carosella, Edgardo D.; Gluckman, Eliane; Dubray, Bernard; Socie, Gerard

1996-01-01

Purpose: Better understanding of radiation-induced effects on the hematopoietic system is important in both the context of therapeutic intervention and accidental exposure. However, direct study of these effects on the hematopoietic stem cell pool is hampered by the small number of accessible cells. We, thus, studied radiation-induced effects on the KG1a stem cell line. Methods and Materials: We confirmed and extended the immunophenotype of KG1a with monoclonal antibodies, established a radiation survival curve, and quantified mRNAs by Northern blotting 30 min after 1, 2, and 3 Gy of ionizing radiation (IR) and followed for up to 48 h after a 3 Gy dose. Cell cycle status and apoptosis were assessed by fluorescent-activated cell sorter (FACS) analysis, cell morphology, and DNA fragmentation. Results: KG1a was found to be CD34+, CD7+, Thy1 low, CD38 low, lineage negative (neg), C-KITneg and HLA-DRneg, a phenotype consistent with a primitive hematopoietic origin. This immunophenotype was not altered by x-ray irradiation. The D 0 value was 1.75 Gy. We showed a time-dependent variation of c-jun mRNA expression with an early and transient dose-dependent induction followed by a second increase at 24 and 48 h: a biphasic dose-dependent variation of bcl-2 expression 30 min after irradiation with a reduction of mRNA level at 1 Gy, and a normalization at higher doses and stable levels of mRNA for c-fos, c-myc, G-CSF, GM-CSF, IL-6, TNF-α, TGF-β, and MIP-1α genes. Cell cycle analysis showed the absence of G1/S phase arrest, a point consistent with the absence of detection of P53 mRNA by Northern blot analysis. The dose-dependent G2/M phase arrest was not followed by significant apoptotic cell death. Conclusion: Taken together, this data indicates that radiation-induced cell death of KG1a, a cell line that has a relatively high D 0 value, does not seem to be the result of the apoptotic pathway but occurs subsequent to a G2/M phase arrest

SSR240612 [(2R)-2-[((3R)-3-(1,3-benzodioxol-5-yl)-3-[[(6-methoxy-2-naphthyl)sulfonyl]amino]propanoyl)amino]-3-(4-[[2R,6S)-2,6-dimethylpiperidinyl]methyl]phenyl)-N-isopropyl-N-methylpropanamide hydrochloride], a new nonpeptide antagonist of the bradykinin B1 receptor: biochemical and pharmacological characterization.

Science.gov (United States)

Gougat, Jean; Ferrari, Bernard; Sarran, Lionel; Planchenault, Claudine; Poncelet, Martine; Maruani, Jeanne; Alonso, Richard; Cudennec, Annie; Croci, Tiziano; Guagnini, Fabio; Urban-Szabo, Katalin; Martinolle, Jean-Pierre; Soubrié, Philippe; Finance, Olivier; Le Fur, Gérard

2004-05-01

The biochemical and pharmacological properties of a novel non-peptide antagonist of the bradykinin (BK) B(1) receptor, SSR240612 [(2R)-2-[((3R)-3-(1,3-benzodioxol-5-yl)-3-[[(6-methoxy-2-naphthyl)sulfonyl]amino]propanoyl)amino]-3-(4-[[2R,6S)-2,6-dimethylpiperidinyl]methyl]phenyl)-N-isopropyl-N-methylpropanamide hydrochloride] were evaluated. SSR240612 inhibited the binding of [(3)H]Lys(0)-des-Arg(9)-BK to the B(1) receptor in human fibroblast MRC5 and to recombinant human B(1) receptor expressed in human embryonic kidney cells with inhibition constants (K(i)) of 0.48 and 0.73 nM, respectively. The compound selectivity for B(1) versus B(2) receptors was in the range of 500- to 1000-fold. SSR240612 inhibited Lys(0)-desAr(9)-BK (10 nM)-induced inositol monophosphate formation in human fibroblast MRC5, with an IC(50) of 1.9 nM. It also antagonized des-Arg(9)-BK-induced contractions of isolated rabbit aorta and mesenteric plexus of rat ileum with a pA(2) of 8.9 and 9.4, respectively. Antagonistic properties of SSR240612 were also demonstrated in vivo. SSR240612 inhibited des-Arg(9)-BK-induced paw edema in mice (3 and 10 mg/kg p.o. and 0.3 and 1 mg/kg i.p.). Moreover, SSR240612 reduced capsaicin-induced ear edema in mice (0.3, 3 and 30 mg/kg p.o.) and tissue destruction and neutrophil accumulation in the rat intestine following splanchnic artery occlusion/reperfusion (0.3 mg/kg i.v.). The compound also inhibited thermal hyperalgesia induced by UV irradiation (1 and 3 mg/kg p.o.) and the late phase of nociceptive response to formalin in rats (10 and 30 mg/kg p.o.). Finally, SSR240612 (20 and 30 mg/kg p.o.) prevented neuropathic thermal pain induced by sciatic nerve constriction in the rat. In conclusion, SSR240612 is a new, potent, and orally active specific non-peptide bradykinin B(1) receptor antagonist.

(2-Formyl-6-methoxyphenolato-κ2O1,O2(perchlorato-κO(1,10-phenanthroline-κ2N,N′copper(II

Directory of Open Access Journals (Sweden)

Zhi-Yong Wu

2008-05-01

Full Text Available In the title molecule, [Cu(C8H7O3(ClO4(C12H8N2], the CuII ion is five-coordinated by two N atoms [Cu—N = 1.995 (3 and 2.022 (3 Å] from a 1,10-phenanthroline ligand, two O atoms [Cu—O = 1.908 (2 and 1.927 (2 Å] from an o-vanillin ligand and one O atom [Cu—O = 2.510 (3 Å] from a perchlorate anion in a distorted square-pyramidal geometry. Three O atoms of the perchlorate anion are rotationally disordered between two orientations, with occupancies of 0.525 (13 and 0.475 (13. In the crystal structure, two molecules related by a centre of symmetry are paired in such a way that the phenolate O atom from one molecule completes the distorted octahedral Cu coordination in another molecule [Cu...O = 2.704 (2 Å].

Canted ferrimagnetism and giant coercivity in the nonstoichiometric double perovskite L a2N i1.19O s0.81O6

Science.gov (United States)

Feng, Hai L.; Reehuis, Manfred; Adler, Peter; Hu, Zhiwei; Nicklas, Michael; Hoser, Andreas; Weng, Shih-Chang; Felser, Claudia; Jansen, Martin

2018-05-01

The nonstoichiometric double perovskite oxide L a2N i1.19O s0.81O6 was synthesized by solid-state reaction and its crystal and magnetic structures were investigated by powder x-ray and neutron diffraction. L a2N i1.19O s0.81O6 crystallizes in the monoclinic double perovskite structure (general formula A2B B'O6 ) with space group P 21/n , where the B site is fully occupied by Ni and the B ' site by 19% Ni and 81% Os atoms. Using x-ray absorption spectroscopy an O s4.5 + oxidation state was established, suggesting the presence of about 50% paramagnetic O s5 + (5 d3 , S =3 /2 ) and 50% nonmagnetic O s4 + (5 d4 , Jeff=0 ) ions at the B ' sites. Magnetization and neutron diffraction measurements on L a2N i1.19O s0.81O6 provide evidence for a ferrimagnetic transition at 125 K. The analysis of the neutron data suggests a canted ferrimagnetic spin structure with collinear N i2 + -spin chains extending along the c axis but a noncollinear spin alignment within the a b plane. The magnetization curve of L a2N i1.19O s0.81O6 features a hysteresis with a very high coercive field, HC=41 kOe , at T =5 K , which is explained in terms of large magnetocrystalline anisotropy due to the presence of Os ions together with atomic disorder. Our results are encouraging to search for rare-earth-free hard magnets in the class of double perovskite oxides.

Nb 3d and O 1s core levels and chemical bonding in niobates

International Nuclear Information System (INIS)

Atuchin, V.V.; Kalabin, I.E.; Kesler, V.G.; Pervukhina, N.V.

2005-01-01

A set of available experimental data on binding energies of Nb 3d 5/2 and O 1s core levels in niobates has been observed with using energy difference (O 1s-Nb 3d 5/2 ) as a robust parameter for compound characterization. An empirical relationship between (O 1s-Nb 3d 5/2 ) values measured with XPS for Nb 5+ -niobates and mean chemical bond length L(Nb-O) has been discussed. A range of (O 1s-Nb 3d 5/2 ) values possible in Nb 5+ -niobates has been defined. An energy gap ∼1.4-1.8 eV is found between (O 1s-Nb 3d 5/2 ) values reasonable for Nb 5+ and Nb 4+ states in niobates

Dual ferroic properties of hexagonal ferrite ceramics BaFe_1_2O_1_9 and SrFe_1_2O_1_9

International Nuclear Information System (INIS)

Kostishyn, V.G.; Panina, L.V.; Timofeev, A.V.; Kozhitov, L.V.; Kovalev, A.N.; Zyuzin, A.K.

2016-01-01

Dual ferroic properties of a strong magnetism and large ferroelectricity have been observed in barium BaFe_1_2O_1_9 and strontium SrFe_1_2O_1_9 hexaferrite ceramics. The samples were fabricated by a modified ceramic technique from highly purified raw materials with addition of boron oxide allowing the control of grain size and enhancement of bulk resistivity. Whereas the samples of PbFe_1_2O_1_9 fabricated by the same technological method did not have sufficient electric resistivity to support an electric field and did not exhibit the ferroelectric properties. The structure of the samples examined by X-ray diffraction is consistent with a single hexagonal phase. The grains are randomly oriented with the average grain size of 300–400 nm coated with boron oxide. The magnetic properties are characterised by standard ferrimagnetic behavior with the Neel temperature of about 450 °C. Large spontaneous polarization was observed with the maximal values of 45–50 μC/cm"2 under an applied electric field of 100–300 kV/m. A strong coupling between magnetic and electric ordering was confirmed by measuring the magnetoelectric (ME) parameter and magnetodielectric ratio. These ME characteristics are more advanced than those for well-known room temperature multiferroic BiFeO_3. Furthermore, by applying an electric field, the manipulation of magnetization in the range of up to 9% was observed, which is even greater than in some substituted hexaferrites with a non-collinear magnetic structure. The obtained results on electrical polarization are similar to the values reported for the corresponding hexaferrites sintered by polymer precursor technique. This suggests a promising potential of M-type hexaferrite ceramics in devices utilizing magnetoelectric coupling. - Highlights: • Ba(Sr)Fe_1_2O_1_9-hexaferrites show large room-temperature multiferroic properties. • Small addition of B_2O_3 increases the hexaferrite resistivity by 4 orders of magnitude. • Large spontaneous

Supplementary data Fig. S1 Fig. S1. FE-SEM images of the ...

Indian Academy of Sciences (India)

微软用户

Fig. S3. Cycling behavior of V2O5 nanomaterials recorded by CV at 20 mV·s-1 scan rate. Page 4. 4. Fig. S4. Fig. S4. Cycling behavior of V2O5 nanomaterials electrodes of galvanostatic charge and discharge profiles recorded by GCD at a current density of 1 A·g-1. Page 5. 5. Fig. S5. Fig. S5. Cycling behavior of V2O5 ...

Toxicological evaluation of the flavour ingredient N-(1-((4-amino-2,2-dioxido-1H-benzo[c][1,2,6]thiadiazin-5-yloxy-2-methylpropan-2-yl-2,6-dimethylisonicotinamide (S2218

Directory of Open Access Journals (Sweden)

Donald S. Karanewsky

Full Text Available A toxicological evaluation of N-(1-((4-amino-2,2-dioxido-1H-benzo[c][1,2,6]thiadiazin-5-yloxy-2-methylpropan-2-yl-2,6-dimethylisonicotinamide (S2218; CAS 1622458-34-7, a flavour with modifying properties, was completed for the purpose of assessing its safety for use in food and beverage applications. S2218 exhibited minimal oxidative metabolism in vitro, and in rat pharmacokinetic studies, the compound was poorly orally bioavailable and rapidly eliminated. S2218 was not found to be mutagenic in an in vitro bacterial reverse mutation assay, and was found to be neither clastogenic nor aneugenic in an in vitro mammalian cell micronucleus assay. In subchronic oral toxicity studies in male and female rats, the NOAEL was 140 mg/kg bw/day (highest dose tested for S2218 sulfate salt (S8069 when administered as a food ad-mix for 13 consecutive weeks. Furthermore, S2218 sulfate salt demonstrated a lack of maternal toxicity, as well as adverse effects on fetal morphology at the highest dose tested, providing a NOAEL of 1000 mg/kg bw/day for both maternal toxicity and embryo/fetal development when administered orally during gestation to pregnant rats. Keywords: Flavours with modifying properties, S2218, FEMA GRAS, Subchronic toxicological evaluation, Genetic toxicological evaluation, Developmental toxicity evaluation

Polarity driven morphology of CeO{sub 2}(1 0 0) islands on Cu(1 1 1)

Energy Technology Data Exchange (ETDEWEB)

Stetsovych, O., E-mail: stetsovycholeksandr@gmail.com; Beran, J.; Dvořák, F.; Mašek, K.; Mysliveček, J., E-mail: Josef.Myslivecek@mff.cuni.cz; Matolín, V.

2013-11-15

Thin ceria films supported by metal substrates represent important model systems for reactivity studies in heterogeneous catalysis. Here we report the growth study of the polar CeO{sub 2}(1 0 0) phase as part of a mixed CeO{sub 2}(1 1 1)–CeO{sub 2}(1 0 0) thin film supported by Cu(1 1 1). The two ceria phases grow on different areas of the substrate, what allows a reliable growth characterization of the CeO{sub 2}(1 0 0) islands on Cu(1 1 1). Scanning tunneling microscopy measurements reveal CeO{sub 2}(1 0 0) to grow in the form of highly dispersed three dimensional (3D) islands on a CeO{sub 2}(1 0 0) interfacial layer. The CeO{sub 2}(1 0 0) islands exhibit a 2 × 2 surface reconstruction. The presence of the surface reconstruction together with the highly dispersed growth of CeO{sub 2}(1 0 0) islands corresponds to the requirement for compensation of the surface dipole moment on the CeO{sub 2}(1 0 0). CeO{sub 2}(1 0 0) islands are further characterized by reflection high energy electron diffraction yielding their epitaxial relations with respect to the Cu(1 1 1) substrate. The growth of well characterized CeO{sub 2}(1 0 0) islands supported by Cu(1 1 1) represents a starting point for developing a novel template for structure-related reactivity studies of ceria based model catalysts.

Effects on proliferation and cell cycle of irradiated KG-1 cells stimulated by CM-CSF

International Nuclear Information System (INIS)

Guo Dehuang; Dong Bo; Wen Gengyun; Luo Qingliang; Mao Bingzhi

2000-01-01

In order to explore the variety of cell proliferation and cell cycle after exposure to ionizing radiation, the responses of irradiated KG-1 cells of the human myeloid leukemia stimulated by GM-CSF, the most common used cytokine in clinic, were investigated. The results showed that GM-CSF enhance KG-1 cells proliferation, reduce G0/G1 block, increase S phase and G2/M phase. The stimulation effects of the GM-CSF are more effective in irradiated group than in control group

Random comparison study of the clinical response to 153Sm-EDTMP 1.0 mCi/kg and 1.5 mCi/kg

International Nuclear Information System (INIS)

Pan, Z.; Zhu, S.

2001-01-01

Sixty-seven patient with painful bone metastases were randomized to two groups. Group 1 (n=34) received 1.0 mCi/kg of 153 Sm-EDTMP and group II (n=33) received 1.5 mCi/kg. All of them met inclusion criteria and there was no significantly difference between the basic conditions of two groups. After receiving 153 Sm-EDTMP intravenously, all patients were kept in close follow-up weekly with blood counting, physician visiting and collecting patient's self-filling-in diary including pain score, Karnofsky performance scale and analgesic consumption. The follow-up duration was six weeks. The final overall condition assessed by physician were graded into no change (including worse), slight relief, significant relief and complete relief. Only significant relief and complete relief were considered as effectiveness for pain relief. Haematological toxicity grade was evaluated based on the nadir of WBC ad PLT counts. The results indicated that the higher dosage group had a higher effectiveness rate (75.76%) compared to the lower dosage group (67.65%), but without statistic significance (x 2 =0.5365, 0.25 153 Sm-EDTMP could be used for those patients with better haematological function and 1.0 mCi/kg used for those patients with poorer haematological function. (author)

Nb 3d and O 1s core levels and chemical bonding in niobates

Energy Technology Data Exchange (ETDEWEB)

Atuchin, V.V. [Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090 (Russian Federation)]. E-mail: atuchin@thermo.isp.nsc.ru; Kalabin, I.E. [Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090 (Russian Federation); Kesler, V.G. [Technical Center, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090 (Russian Federation); Pervukhina, N.V. [Laboratory of Crystal Chemistry, Institute of Inorganic Chemistry, SB RAS, Novosibirsk 630090 (Russian Federation)

2005-02-01

A set of available experimental data on binding energies of Nb 3d{sub 5/2} and O 1s core levels in niobates has been observed with using energy difference (O 1s-Nb 3d{sub 5/2}) as a robust parameter for compound characterization. An empirical relationship between (O 1s-Nb 3d{sub 5/2}) values measured with XPS for Nb{sup 5+}-niobates and mean chemical bond length L(Nb-O) has been discussed. A range of (O 1s-Nb 3d{sub 5/2}) values possible in Nb{sup 5+}-niobates has been defined. An energy gap {approx}1.4-1.8 eV is found between (O 1s-Nb 3d{sub 5/2}) values reasonable for Nb{sup 5+} and Nb{sup 4+} states in niobates.

Modulation-free bismuth-lead cuprate superconductors: BiPbSr1+xL1-xCuO6 and BiPbSr2Y1-xCaxCu2O8

International Nuclear Information System (INIS)

Manivannan, V.; Gopalakrishnan, J.; Rao, C.N.R.

1991-01-01

Modulation-free BiPbSrLCuO 6 (L=La, Pr, Nd) and BiPbSr 2 YCu 2 O 8 , which are isotypic with the n=1 and 2 members of the Bi 2 Sr 2 Ca n-1 Cu n O 2n+4 family, have been prepared and characterized. These parent compounds are nonsuperconducting, but when doped with holes by substitution chemistry give modulation-free superconducting cuprates of the general formulas BiPbSr 1+xL1-x CuO 6 and BiPbSr 2 Y 1-x Ca x Cu 2 O 8 , exhibiting maximum T c 's of 24 and 85 K, respectively. Significantly, the hole concentration at the maximum T c is 0.12 in the cuprate family with a single Cu-O layer and 0.22 in that with two Cu-O layers

Evidence of site-specific fragmentation on thioacetic acid, CH3C(O)SH, irradiated with synchrotron radiation around the S 2p and O 1s regions.

Science.gov (United States)

Erben, Mauricio F; Geronés, Mariana; Romano, Rosana M; Della Védova, Carlos O

2006-01-26

Site-specific fragmentations following S 2p and O 1s photoexcitation of thioacetic acid, CH3C(O)SH, have been studied by means of synchrotron radiation. Total ion yield (TIY) spectra were measured and multicoincidence techniques, which include photoelectron-photoion coincidence (PEPICO) and photoelectron-photoion-photoion coincidence (PEPIPICO) time-of-flight mass spectrometry, were applied. The equivalent-core approximation was employed in order to estimate ionization transition values, and the observed peaks were tentatively assigned. A site-specific fragmentation is moderately observed by comparing the mass spectra collected at resonant energies around the inner and shallow inner shell S 2p and O 1s ionization edges. Beside H+ ion, the most abundant ions observed at the S 2p edge excitation were CH3CO+, SH+, S+, and CH3+. At the O 1s region the large CH3CO+ fragment was depressed, and small CHx+ (x = 0, 1, 2, 3), S+, and SH+ fragments were dominant. The dissociation dynamic for the main ion-pair production has been discussed. Two- and three-body dissociation channels have been observed in the PEPIPICO spectra, and the dissociation mechanisms were proposed.

High sensitivity cavity ring down spectroscopy of N_2O near 1.22 µm: (II) "1"4N_2"1"6O line intensity modeling and global fit of "1"4N_2"1"8O line positions

International Nuclear Information System (INIS)

Tashkun, S.A.; Perevalov, V.I.; Karlovets, E.V.; Kassi, S.; Campargue, A.

2016-01-01

In a recent work (Karlovets et al., 2016 [1]), we reported the measurement and rovibrational assignments of more than 3300 transitions belonging to 64 bands of five nitrous oxide isotopologues ("1"4N_2"1"6O, "1"4N"1"5N"1"6O, "1"5N"1"4N"1"6O, "1"4N_2"1"8O and "1"4N_2"1"7O) in the high sensitivity CRDS spectrum recorded in the 7915–8334 cm"−"1 spectral range. The assignments were performed by comparison with predictions of the effective Hamiltonian models developed for each isotopologue. In the present paper, the large amount of measurements from our previous work mentioned above and literature are gathered to refine the modeling of the nitrous oxide spectrum in two ways: (i) improvement of the intensity modeling for the principal isotopologue, "1"4N_2"1"6O, near 8000 cm"−"1 from a new fit of the relevant effective dipole moment parameters, (ii) global modeling of "1"4N_2"1"8O line positions from a new fit of the parameters of the global effective Hamiltonian using an exhaustive input dataset collected in the literature in the 12–8231 cm"−"1 region. The fitted set of 81 parameters allowed reproducing near 5800 measured line positions with an RMS deviation of 0.0016 cm"−"1. The dimensionless weighted standard deviation of the fit is 1.22. As an illustration of the improvement of the predictive capabilities of the obtained effective Hamiltonian, two new "1"4N_2"1"8O bands could be assigned in the CRDS spectrum in the 7915–8334 cm"−"1 spectral range. A line list at 296 K has been generated in the 0–10,700 cm"−"1 range for "1"4N_2"1"8O in natural abundance with a 10"−"3"0 cm/molecule intensity cutoff. - Highlights: • Line parameters of two new "1"4N_2"1"8O bands centered at 7966 cm"−"1 and at 8214 cm"−"1. • Refined sets of the "1"4N_2"1"6O effective dipole moment parameters for ΔP=13,14 series. • Global modeling of "1"4N_2"1"8O line positions and intensities in the 12–8231 cm"−"1 range. • 5800 observed of "1"4N_2"1"8O line positions

Enhancement of electrochemical performance of LiNi_1_/_3Co_1_/_3Mn_1_/_3O_2 by surface modification with MnO_2

International Nuclear Information System (INIS)

Guo, Xin; Cong, Li-Na; Zhao, Qin; Tai, Ling-Hua; Wu, Xing-Long; Zhang, Jing-Ping; Wang, Rong-Shun; Xie, Hai-Ming; Sun, Li-Qun

2015-01-01

LiNi_1_/_3Co_1_/_3Mn_1_/_3O_2 is successfully coated with MnO_2 by a chemical deposition method. The X-ray diffraction (XRD), scanning electron microscope (SEM) and high resolution transmission electron microscope (HRTEM) results demonstrate that MnO_2 forms a thin layer on the surface of LiNi_1_/_3Co_1_/_3Mn_1_/_3O_2 without destroying the crystal structure of the core material. Compared with pristine LiNi_1_/_3Co_1_/_3Mn_1_/_3O_2, the MnO_2-coated sample shows enhanced electrochemical performance especially the rate capability. Even at a current density of 750 mA g"−"1, the discharge capacity of MnO_2-coated LiNi_1_/_3Co_1_/_3Mn_1_/_3O_2 is 155.15 mAh g"−"1, while that of the pristine electrode is only 132.84 mAh g"−"1 in the range of 2.5–4.5 V. The cyclic voltammetry (CV) and X-ray photoelectron spectroscopy (XPS) curves show that the MnO_2 coating layer reacts with Li"+ during cycling, which is responsible for the higher discharge capacity of MnO_2-coated LiNi_1_/_3Co_1_/_3Mn_1_/_3O_2. Electrochemical impedance spectroscopy (EIS) results confirmed that the MnO_2 coating layer plays an important role in reducing the charge transfer resistance on the electrolyte–electrode interfaces. - Highlights: • MnO_2 coated LiNi_1_/_3Co_1_/_3Mn_1_/_3O_2 cathode material is synthesized for the first time. • MnO_2 offers available sites for insertion of extracted lithium. • The preserved surface and crystal structures results in the improved kinetics.

Reactions of POxCly- ions with O2(a 1[Delta]g), H2O, and Cl2 at 298 K

Science.gov (United States)

Midey, Anthony J.; Dotan, Itzhak; Viggiano, A. A.

2008-06-01

The rate constants and product branching ratios for the reactions of phosphorus oxychloride anions, POxCly- for x = 1-2 and y = 1-3, with O2(a 1[Delta]g), Cl2, and H2O have been measured in a selected ion flow tube (SIFT) at 298 K. A mixture of O2(a 1[Delta]g) in O2 has been produced using a recently designed chemical singlet oxygen generator (sparger) with an emission detection scheme adopted previously in our laboratory. The experiments continue a series of investigations into the oxidation reactions of POxCly- ions, searching for pathways to the terminal PO2- and PO3- ions observed in combustion chemistry with POCl3 present. None of the POxCly- ions react with H2O or O2(a 1[Delta]g). The O2(a 1[Delta]g) rate constants have a limit of <1 × 10-11 cm3 s-1, except for PO2Cl- where a limit of <5 × 10-11 cm3 s-1 has been determined. The H2O rate constants have limits of <1 × 10-11 cm3 s-1. All of the POxCly- ions react with Cl2, excluding PO3- and PO2Cl2-. Depending on the reactant ion, Cl-, Cl2- or PO2Cl2- product ions form.

Crystal structures of CCa2CuO5 and CSr1.9Ca1.1Cu2O7 refined from single crystal data

International Nuclear Information System (INIS)

Kopnin, E.M.; Matveev, A.T.; Salamakha, P.S.; Sato, A.; Takayama-Muromachi, E.

2003-01-01

Single crystals were grown for new layered oxycarbonates CCa 2 CuO 5 and CSr 1.9 Ca 1.1 Cu 2 O 7 at 6 GPa using a belt-type apparatus. Their crystal structures were determined using single crystal X-ray diffraction data with R1(wR2)=0.0294(0.0659) and 0.0199(0.0457) for CCa 2 CuO 5 and CSr 1.9 Ca 1.1 Cu 2 O 7 , respectively. These phases crystallize in the space group P4/mmm (No. 123), Z=1 with a=3.8157(1) Angst, c=7.1426(3) Angst for CCa 2 CuO 5 and a=3.8753(1) Angst, c=10.6765(5) Angst for CSr 1.9 Ca 1.1 Cu 2 O 7 . In contrast to CSr 2 CuO 5 , no ordering in the orientation of the triangular CO 3 groups was revealed in CCa 2 CuO 5 and CSr 1.9 Ca 1.1 Cu 2 O 7

Hydrogen peroxide mediates Rac1 activation of S6K1

International Nuclear Information System (INIS)

Bae, Gyu-Un; Kim, Yong Kee; Kwon, Hyoung-Keun; Park, Jong Woo; Lee, Eun Kyung; Paek, Se Jin; Choi, Wahn Soo; Jung, In Duk; Lee, Hoi Young; Cho, Eun-Jung; Lee, Hyang Woo; Han, Jeung-Whan

2004-01-01

We previously reported that hydrogen peroxide (H 2 O 2 ) mediates mitogen activation of ribosomal protein S6 kinase 1 (S6K1) which plays an important role in cell proliferation and growth. In this study, we investigated a possible role of H 2 O 2 as a molecular linker in Rac1 activation of S6K1. Overexpression of recombinant catalase in NIH-3T3 cells led to the drastic inhibition of H 2 O 2 production by PDGF, which was accompanied by a decrease in S6K1 activity. Similarly, PDGF activation of S6K1 was significantly inhibited by transient transfection or stable transfection of the cells with a dominant-negative Rac1 (Rac1N17), while overexpression of constitutively active Rac1 (Rac1V12) in the cells led to an increase in basal activity of S6K1. In addition, stable transfection of Rat2 cells with Rac1N17 dramatically attenuated the H 2 O 2 production by PDGF as compared with that in the control cells. In contrast, Rat2 cells stably transfected with Rac1V12 produced high level of H 2 O 2 in the absence of PDGF, comparable to that in the control cells stimulated with PDGF. More importantly, elimination of H 2 O 2 produced in Rat2 cells overexpressing Rac1V12 inhibited the Rac1V12 activation of S6K1, indicating the possible role of H 2 O 2 as a mediator in the activation of S6K1 by Rac1. However, H 2 O 2 could be also produced via other pathway, which is independent of Rac1 or PI3K, because in Rat2 cells stably transfected with Rac1N17, H 2 O 2 could be produced by arsenite, which has been shown to be a stimulator of H 2 O 2 production. Taken together, these results suggest that H 2 O 2 plays a pivotal role as a mediator in Rac1 activation of S6K1

A Monazite of Bangka Processing Laboratory Work is Undertaken to Recover Rare Earth Oxides for 1 kg/day Capacity

International Nuclear Information System (INIS)

Hafni-Lissa-Nuri; Faizal-Riza; Susilaningtyas; Sugeng-Waluyo; Erni-Rifandriyah-Arief

2004-01-01

This laboratory work is collaboration P2BGGN-BATAN and PT. Timah Tbk. to obtain monazite data process for use equipment calculation and economic pilot scales. A RE 2 O 3 can be treated to become an individual elements (Ce, Pr, Nd, Pm, Sm, Eu, etc.) and can be used as a raw materials in the industries of electronics, magnetics, ceramics, steels and glass optic etc. RE 2 O 3 which are gained from processing of 100 kg monazite with -325 mesh in size distribution and 1 kg/day capacity will be the sample for PT Timah marketing activity. The process is done with use equipments laboratory scale that were designed last year. The equipment processes are decomposition, dissolution, precipitation tank and calcinator. Total RE 2 O 3 production are 45 kg and total recovery RE 2 O 3 71,696 % ; Th 2,129 % ; U and P 2 O 5 0 %, Purify products RE 2 O 3 93,59 % and Th 1143 ppm. Based on the assessment of Chemex Inc Canada, the product of RE 2 O 3 contains are about >55,32 % RE 2 O 3 and 16 ppm Th. U and Th content within specification product of RE 2 O 3 depends to buyer/request. (author)

Toxicological evaluation of two novel bitter modifying flavour compounds: 3-(1-((3,5-dimethylisoxazol-4-ylmethyl-1H-pyrazol-4-yl-1-(3-hydroxybenzylimidazolidine-2,4-dione and 3-(1-((3,5-dimethylisoxazol-4-ylmethyl-1H-pyrazol-4-yl-1-(3-hydroxybenzyl-5,5-dimethylimidazolidine-2,4-dione

Directory of Open Access Journals (Sweden)

Donald S. Karanewsky

Full Text Available A toxicological evaluation of two novel bitter modifying flavour compounds, 3-(1-((3,5-dimethylisoxazol-4-ylmethyl-1H-pyrazol-4-yl-1-(3-hydroxybenzylimidazolidine-2,4-dione (S6821, CAS 1119831-25-2 and 3-(1-((3,5-dimethylisoxazol-4-ylmethyl-1H-pyrazol-4-yl-1-(3-hydroxybenzyl-5,5-dimethylimidazolidine-2,4-dione (S7958, CAS 1217341-48-4, were completed for the purpose of assessing their safety for use in food and beverage applications. S6821 undergoes oxidative metabolism in vitro, and in rat pharmacokinetic studies both S6821 and S7958 are rapidly converted to the corresponding O-sulfate and O-glucuronide conjugates. S6821 was not found to be mutagenic or clastogenic in vitro, and did not induce micronuclei in bone marrow polychromatic erythrocytes in vivo. S7958, a close structural analog of S6821, was also found to be non-mutagenic in vitro. In short term and subchronic oral toxicity studies in rats, the no-observed-adverse-effect-level (NOAEL for both S7958 and S6821 was 100 mg/kg bw/day (highest dose tested when administered as a food ad-mix for either 28 or 90 consecutive days, respectively. Furthermore, S6821 demonstrated a lack of maternal toxicity, as well as adverse effects on fetal morphology at the highest dose tested, providing a NOAEL of 1000 mg/kg bw/day for both maternal toxicity and embryo/fetal development when administered orally during gestation to pregnant rats. Keywords: S6821, S7958, FEMA GRAS, Subchronic toxicological evaluation, Genetic toxicological evaluation

Test Results of a 1.2 kg/s Centrifugal Liquid Helium Pump for the ATLAS Superconducting Toroid Magnet System

CERN Document Server

Pengo, R; Passardi, Giorgio; Pirotte, O; ten Kate, H H J

2002-01-01

The toroid superconducting magnet of ATLAS-LHC experiment at CERN will be indirectly cooled by means of forced flow of liquid helium at about 4.5 K. A centrifugal pump will be used, providing a mass flow of 1.2 kg/s and a differential pressure of 40 kPa (ca. 400 mbar) at about 4300 rpm. Two pumps are foreseen, one for redundancy, in order to feed in parallel the cooling circuits of the Barrel and the two End-Caps toroid magnets. The paper describes the tests carried out at CERN to measure the characteristic curves, i.e. the head versus the mass flow at different rotational speeds, as well as the pump total efficiency. The pump is of the "fullemission" type, i.e. with curved blades and it is equipped with an exchangeable inducer. A dedicated pump test facility has been constructed at CERN, which includes a Coriolis-type liquid helium mass flow meter. This facility is connected to the helium refrigerator used for the tests at CERN of the racetrack magnets of the Barrel and of the End-Cap toroids.

Density functional theory study of the adsorption and dissociation of O{sub 2} on CuO(1 1 1) surface

Energy Technology Data Exchange (ETDEWEB)

Sun, Shujuan, E-mail: sunshujuan@hebut.edu.cn [School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130 (China); Li, Chunyu [Science and Technology Innovation Center, Datang Technologies Industry Group Company Limited, Beijing (China); Zhang, Dongsheng [School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130 (China); Wang, Yanji, E-mail: yjwang@hebut.edu.cn [School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130 (China)

2015-04-01

Highlights: • The dissociation mechanisms of O{sub 2} on the CuO(1 1 1) surface have been obtained. • The energy barriers and reaction energies are calculated. • The presence of oxygen vacancy can obviously improve the catalytic activity of CuO. - Abstract: Density functional theory (DFT) have been performed to investigate the adsorption and dissociation of O{sub 2} on the perfect and oxygen-deficient CuO(1 1 1) surfaces. The calculated results indicate that the bridge site of two Cu{sub sub} atoms is the most favorable site for O adsorption on the perfect CuO(1 1 1) surface. But on the oxygen-deficient CuO(1 1 1) surface, the O atom adsorbed on O{sub vacancy} site after optimization. On the perfect and oxygen-deficient CuO(1 1 1) surfaces, the O{sub 2} are all paralleling to the surface after optimization. Possible dissociation pathways of molecularly adsorbed O{sub 2} on the two surfaces are identified. The calculated results suggest that the presence of oxygen vacancy exhibits a strong chemical reactivity towards the dissociation of O{sub 2} and can obviously improve the catalytic activity of CuO.

O2(a1Δ) vibrational kinetics in oxygen-iodine laser

Science.gov (United States)

Torbin, A. P.; Pershin, A. A.; Heaven, M. C.; Azyazov, V. N.; Mebel, A. M.

2018-04-01

Kinetics of vibrationally-excited singlet oxygen O2(a1Δ,ν) in gas mixture O3/N2/CO2 was studied using a pulse laser technique. Molecules O2(a1Δ,ν) were produced by laser photolysis of ozone at 266 nm. The O3 molecules number density was followed using time-resolved absorption spectroscopy. It was found that an upper bound for the rate constant of chemical reaction O2(a1Δ,ν)+ O3 is about 10-15 cm3/s. The rate constants of O2(a1Δ,ν= 1, 2 and 3) quenching by CO2 are presented.

O2(a1Δ) Quenching In The O/O2/O3 System

Science.gov (United States)

Azyazov, V. N.; Mikheyev, P. A.; Postell, D.; Heaven, M. C.

2010-10-01

The development of discharge singlet oxygen generators (DSOG's) that can operate at high pressures is required for the power scaling of the discharge oxygen iodine laser. In order to achieve efficient high-pressure DSOG operation it is important to understand the mechanisms by which singlet oxygen (O2(a1Δ)) is quenched in these devices. It has been proposed that three-body deactivation processes of the type O2(a1Δ)+O+M→2O2+M provide significant energy loss channels. To further explore these reactions the physical and reactive quenching of O2(a1Δ) in O(3P)/O2/O3/CO2/He/Ar mixtures has been investigated. Oxygen atoms and singlet oxygen molecules were produced by the 248 nm laser photolysis of ozone. The kinetics of O2(a1Δ) quenching were followed by observing the 1268 nm fluorescence of the O2a1Δ-X3∑ transition. Fast quenching of O2(a1Δ) in the presence of oxygen atoms and molecules was observed. The mechanism of the process has been examined using kinetic models, which indicate that quenching by vibrationally excited ozone is the dominant reaction.

O2(a1Δ) Quenching In The O/O2/O3 System

International Nuclear Information System (INIS)

Azyazov, V. N.; Mikheyev, P. A.; Postell, D.; Heaven, M. C.

2010-01-01

The development of discharge singlet oxygen generators (DSOG's) that can operate at high pressures is required for the power scaling of the discharge oxygen iodine laser. In order to achieve efficient high-pressure DSOG operation it is important to understand the mechanisms by which singlet oxygen (O 2 (a 1 Δ)) is quenched in these devices. It has been proposed that three-body deactivation processes of the type O 2 (a 1 Δ)+O+M→2O 2 +M provide significant energy loss channels. To further explore these reactions the physical and reactive quenching of O 2 (a 1 Δ) in O( 3 P)/O 2 /O 3 /CO 2 /He/Ar mixtures has been investigated. Oxygen atoms and singlet oxygen molecules were produced by the 248 nm laser photolysis of ozone. The kinetics of O 2 (a 1 Δ) quenching were followed by observing the 1268 nm fluorescence of the O 2 a 1 Δ-X 3 Σ transition. Fast quenching of O 2 (a 1 Δ) in the presence of oxygen atoms and molecules was observed. The mechanism of the process has been examined using kinetic models, which indicate that quenching by vibrationally excited ozone is the dominant reaction.

Thermochemical data for D{sub 2}O. Table 2A1

Energy Technology Data Exchange (ETDEWEB)

Axblom, Einar

1961-03-15

The above mentioned data are given in table form 10 (10) 370 deg C (p. 6) and 4 (1) 370 deg C (pp. 7-14). This report was written in order to sum up measurements of v'{sub s} for D{sub 2}O according to available references up to 300 deg C, and suggests an extrapolation formula for the range 300 - 370 deg C with great accuracy. p{sub s} for D{sub 2}O was calculated from an empirical formula. v''{sub s} for D{sub 2}O was calculated by assuming that the molecular volumes of D{sub 2}O and H{sub 2}O are the same at the same pressure and reduced temperature.

Electric Properties of Pb(Sb1/2Nb1/2)O3 PbTiO3 PbZrO3 Ceramics

Science.gov (United States)

Kawamura, Yasushi; Ohuchi, Hiromu

1994-09-01

Solid-solution ceramics of ternary system xPb(Sb1/2Nb1/2)O3 yPbTiO3 zPbZrO3 were prepared by the solid-state reaction of powder materials. Ceramic, electric, dielectric and piezoelectric properties and crystal structures of the system were studied. Sintering of the system xPb(Sb1/2Nb1/2)O3 yPbTiO3 zPbZrO3 is much easier than that of each end composition, and well-sintered high-density ceramics were obtained for the compositions near the morphotropic transformation. Piezoelectric ceramics with high relative dielectric constants, high radial coupling coefficient and low resonant resistance were obtained for the composition near the morphotropic transformation. The composition Pb(Sb1/2Nb1/2)0.075Ti0.45Zr0.475O3 showed the highest dielectric constant (ɛr=1690), and the composition Pb(Sb1/2Nb1/2)0.05Ti0.45Zr0.5O3 showed the highest radial coupling coefficient (kp=64%).

Positronium formation and hydrated positron reactions in H2O, D2O, 1.74 M PPS/H2O and 1.74 M PPS/D2O solutions of Cl−, Br− and I−

DEFF Research Database (Denmark)

Mogensen, O. E.; Pedersen, Niels Jørgen

1986-01-01

Angular correlation of annihilation photons were measured for H2O, D2O, 1.74 M PPS/H2O and 1.74 M PPS/D2O solutions of Cl−, Br− and I−. The three components of the angular correlation spectra for D2O and H2O were nearly identical in shape. The positronium (Ps) yields for the H2O and D2O solutions...... before annihilation (lifetime 400 ps) was determined for the three halides in the four solvents. Simple kinetic equations (“trapping model”) with time dependent rate constant, solved analytically, could explain the [X−, e+] formation in H2O fairly well for concentrations below 0.03 M X−, if a diffusion...... controlled reaction with positron diffusion constant D = 5 × 10−5 cm2/s and reaction radius R = 1 nm were assumed. The three halides gave roughly identical [X−, e+] formation below 0.03 M X−. The difference between the four solutions could be explained partly only in terms of viscosity change for the model...

Microwave-induced combustion synthesis and electrical conductivity of Ce1-xGd xO2-1/2x ceramics

International Nuclear Information System (INIS)

Fu, Y.-P.; Chang, Y.-S.; Wen, S.-B.

2006-01-01

Ce 1-x Gd x O 2-1/2x nanopowder were successfully synthesized by microwave-induced combustion process. For the preparation, cerium nitrate, gadolinium nitrate hexahydrate, and urea were used for the microwave-induced combustion process. The process took only 30 min to obtain Ce 1-x Gd x O 2-1/2x powders. The exo-endo temperature, phase identification, and morphology of resultant powders were investigated by TG/DTA, XRD, and SEM. The as-received Ce 1-x Gd x O 2-1/2x powders showed that the average particle size ranged from 18 to 50 nm, crystallite dimension varied from 11 to 20 nm, and the specific surface area was distribution from 16 to 46 m 2 /g. As for Ce 1-x Gd x O 2-1/2x ceramics sintered at 1450 deg. C for 3 h, the bulk density of Ce 1-x Gd x O 2-1/2x ceramics were over 91% of the theoretical density, the maximum electrical conductivity, σ 700deg.C = 0.017 S/cm with minimum activation energy, E a = 0.869 eV was found at Ce 0.80 Gd 0.20 O 1.90 ceramic

Structure and microstructure of the high pressure synthesised misfit layer compound [Sr2O2][CrO2]1.85

International Nuclear Information System (INIS)

Castillo-Martinez, E.; Schoenleber, A.; Smaalen, S. van; Arevalo-Lopez, A.M.; Alario-Franco, M.A.

2008-01-01

The strontium chromium oxide [Sr 2 O 2 ][CrO 2 ] 1.85 misfit layer compound has been synthesised at high-pressure and high-temperature conditions. Electron diffraction patterns and high-resolution transmission electron microscopy images along [001] show the misfit character of the different layers composing the structure with a supercell along the incommensurate parameter b∼7b 1 ∼13b 2 . The modulated crystal structure has been refined within the superspace formalism against single-crystal X-ray diffraction data, employing the (3+1)-dimensional superspace group C'nmb(0σ 2 0)0 0 s. The compound has a composite structure with lattice parameters a 1 =5.182(1) A, b 1 =5.411(1) A, c 1 =18.194(3) A for the first, SrO, subsystem and the same a and c, but with b 2 =2.925(1) A for the second, CrO 2 , subsystem. The layer stacking is similar to that of orthorhombic PbS(TiS 2 ) 1.18 , but with a much stronger intersubsytem bonding in the case of the oxide. The intersubsystem lattice mismatch is mainly handled by displacement modulations of the Sr atoms, correlated with modulations of the valence, the coordination and the anisotropic displacement parameters. - Graphical abstract: A strontium chromium oxide, [Sr 2 O 2 ][CrO 2 ] 1.85 , with an orthorhombic misfit layer structure has been synthesised under high pressure. Mainly modulations on the Sr position, ADPs and coordination save the subsystems lattice mismatch

Upper limits for the circular dichroism for the C 1s and O 1s core excitation of methyl oxirane

International Nuclear Information System (INIS)

Pruemper, G; Lischke, T; Fukuzawa, H; Reinkoester, A; Ueda, K

2007-01-01

The circular dichroism (CD) in the total and partial ion yields of methyl-oxirane C 3 H 6 O was measured at the C 1s and O 1s edges. The difference of the response of the chiral molecule to circularly polarized light with opposite handedness was found to be less than 0.2% for the total ion yield and less than 0.5% for the partial ion yield. Additionally we tried to find a dipole allowed molecular orientation CD effect by analysing the fragmentation in the forward and backward direction. For this effect we found an upper limit of 1-2% for all abundant ionic fragments

(2S,4R-2-[(1R-1-(4-Bromophenyl-2-nitroethyl]-4-ethylcyclohexanone

Directory of Open Access Journals (Sweden)

Chi-Xiao Zhang

2013-02-01

Full Text Available The crystal structure of the title compound, C16H20BrNO3, contains three chiral centers in the configuration 1R,2S,6R. The cyclohexane ring is in a chair conformation. In the crystal, molecules are linked by weak C—H...O interactions, forming chains along the a-axis direction.

(2-Benzoyl-1-phenylethenolato-κ2O,O′bis[2-(1-phenyl-1H-benzimidazol-2-ylphenyl-κC1]iridium(III dichloromethane disolvate

Directory of Open Access Journals (Sweden)

Stanislav I. Bezzubov

2016-12-01

Full Text Available We present here synthesis and crystal structure of a neutral IrIII complex, [Ir(C19H13N22(C15H11O2]·2CH2Cl2 or [Ir(C^N2O^O]·2CH2Cl2, where C^N is 1,2-diphenyl-1H-benzimidazole and O^O is 2-benzoyl-1-phenylethenolate. The coordination sphere of the IrIII atom, located on a twofold rotation axis, is that of a slighlty distorted C2N2O2 octahedron, with the N atoms in a trans configuration. In the crystal, complex molecules assemble through weak C—H...π interactions in the range 2.699 (3–2.892 (3 Å. The solvent CH2Cl2 molecules reside in channels aligned along the a axis and are connected to the complex molecules by C—H...O interactions.

Cs_7Sm_1_1[TeO_3]_1_2Cl_1_6 and Rb_7Nd_1_1[TeO_3]_1_2Br_1_6, the new tellurite halides of the tetragonal Rb_6LiNd_1_1[SeO_3]_1_2Cl_1_6 structure type

International Nuclear Information System (INIS)

Charkin, Dmitri O.; Black, Cameron; Downie, Lewis J.; Sklovsky, Dmitry E.; Berdonosov, Peter S.; Olenev, Andrei V.; Zhou, Wuzong; Lightfoot, Philip; Dolgikh, Valery A.

2015-01-01

Two new rare-earth – alkali – tellurium oxide halides were synthesized by a salt flux technique and characterized by single-crystal X-ray diffraction. The structures of the new compounds Cs_7Sm_1_1[TeO_3]_1_2Cl_1_6 (I) and Rb_7Nd_1_1[TeO_3]_1_2Br_1_6 (II) (both tetragonal, space group I4/mcm) correspond to the sequence of [MLn_1_1(TeO_3)_1_2] and [M_6X_1_6] layers and bear very strong similarities to those of known selenite analogs. We discuss the trends in similarities and differences in compositions and structural details between the Se and Te compounds; more members of the family are predicted. - Graphical abstract: Two new rare-earth – alkali – tellurium oxide halides were predicted and synthesized. - Highlights: • Two new rare-earth – alkali – tellurium oxide halides were synthesized. • They adopt slab structure of rare earth-tellurium-oxygen and CsCl-like slabs. • The Br-based CsCl-like slabs have been observed first in this layered family.

Interference-free determination of sub ng kg-1 levels of long-lived 93Zr in the presence of high concentrations (μg kg-1) of 93Mo and 93Nb using ICP-MS/MS.

Science.gov (United States)

Petrov, Panayot; Russell, Ben; Douglas, David N; Goenaga-Infante, Heidi

2018-01-01

Long-lived high abundance radionuclides are of increasing interest with regard to decommissioning of nuclear sites and longer term nuclear waste storage and disposal. In many cases, no routine technique is available for their measurement in nuclear waste and low-level (ng kg -1 ) environmental samples. Recent advances in ICP-MS technology offer attractive features for the selective and sensitive determination of a wide range of long-lived radionuclides. In this work, inductively coupled plasma-tandem mass spectrometry (ICP-MS/MS)-based methodology, suitable for accurate routine determinations of 93 Zr at very low (ng kg -1 ) levels in the presence of high levels (μg kg -1 ) of the isobaric interferents 93 Nb and 93 Mo (often present in nuclear waste samples), is reported for the first time. Additionally, a novel and systematic strategy for method development based on the use of non-radioactive isotopes is proposed. It relies on gas-phase chemical reactions for different molecular ion formation to achieve isobaric interference removal. Using cell gas mixtures of NH 3 /He/H 2 or H 2 /O 2 , and suitable mass shifts, the signal from the 93 Nb and 93 Mo isobaric interferences on 93 Zr were suppressed by up to 5 orders of magnitude. The achieved limit of detection for 93 Zr was 1.3 × 10 -5  Bq g -1 (equivalent to 0.14 ng kg -1 ). The sample analysis time is 2 min, which represents a significant improvement in terms of sample throughput, compared to liquid scintillation counting methods. The method described here can be used for routine measurements of 93 Zr at environmentally relevant levels. It can also be combined with radiometric techniques for use towards the standardisation of 93 Zr measurements. Graphical abstract Interference-free determination of 93 Zr in the presence of high concentrations of isobaric 93 Mo and 93 Nb by ICP-MS/MS.

G1- and S-phase syntheses of histones H1 and H1o in mitotically selected CHO cells: utilization of high-performance liquid chromatography

International Nuclear Information System (INIS)

D'Anna, J.A.; Thayer, M.M.; Tobey, R.A.; Gurley, L.R.

1985-01-01

The authors have employed high-performance liquid chromatography (HPLC) to investigate the syntheses of histones H1 and H1o as synchronized cells traverse from mitosis to S phase. Chinese hamster (line CHO) cells were synchronized by mitotic selection, and, at appropriate times, they were pulse labeled for 1 h with [ 3 H]lysine. Histones H1 and H1o were extracted by blending radiolabeled and carrier cells directly in 0.83 M HC1O 4 ; the total HC1O 4 -soluble, Cl 3 CCO 2 H-precipitable proteins were then separated by a modification of an HPLC system employing three mu Bondapak reversed-phase columns. These procedures (1) produce minimally perturbed populations of synchronized proliferating cells and (2) maximize the recovery of radiolabeled histones during isolation and analysis. Measurements of rates of synthesis indicate that the rate of H1 synthesis increases as cells traverse from early to mid G1; as cells enter S phase, the rate of H1 synthesis increases an additional congruent to 22-fold and is proportional to the number of S-phase cells. In contrast to H1, the rate of H1o synthesis is nearly constant throughout G1. As cells progress into S phase, the rate of H1o synthesis increases so that it also appears to be proportional to the number of S-phase cells. Except for the first 1-2 h after mitotic selection, these results are similar to those obtained when cells are synchronized in G1 with the isoleucine deprivation procedure

Preparation and Photocatalytic Property of Sr(Zr1-xYx)O3/TiO2/CdS heterojunction photocatalysts

International Nuclear Information System (INIS)

Chen Yonggang; Liu Suwen; Zhang Haiping; Xiu Zhiliang; Yu Xiaojun; Wang Enhua; Li Tanggang

2010-01-01

A novel composite heterojunction photocatalysts Sr(Zr 1-x Y x )O 3 /TiO 2 /CdS was prepared by sol-gel combustion method. Its photoatalytic properties under visible light were investigated through degradation of methyl orange. XRD, SEM, Uv-Vis and PL techniques were used to characterize the structure and optical properties of the sample. The results showed that the photocatalytic activity of prepared composite photocatalysts under visible light is 2.85 times of that of pure TiO 2 .

Improved wavelengths for the 1s2s3S1-1s2p3P0,2 transitions in helium-like Si12+

International Nuclear Information System (INIS)

Armour, I.A.; Myers, E.G.; Silver, J.D.; Traebert, E.; Oxford Univ.

1979-01-01

The wavelengths of the 1s2s 3 S 1 -1s2p 3 P 0 , 2 transitions in He-like Si 12+ have been remaesured to be 87.86 +- 0.01 nm and 81.48 +- 0.01 nm. The use of Rydberg lines for the calibration of fast beam spectra is discussed. (orig.)

Poly[[μ2-2,2′-diethyl-1,1′-(butane-1,4-diyldiimidazole-κ2N3:N3′](μ2-5-hydroxyisophthalato-κ2O1:O3zinc

Directory of Open Access Journals (Sweden)

Ying-Ying Liu

2011-11-01

Full Text Available In the title coordination polymer, [Zn(C8H4O5(C14H22N4]n, the ZnII cation is coordinated by an O2N2 donor set in a distorted tetrahedral geometry. The ZnII ions are linked by μ2-OH-bdc (OH-H2bdc = 5-hydroxyisophthalic acid and bbie ligands [bbie = 2,2′-diethyl-1,1′-(butane-1,4-diyldiimidazole], forming a two-dimensional layer parallel to the ab plane. The layers are further connected through intermolecular C—H...O and O—H...O hydrogen bonds, forming a three-dimensional supramolecular structure. In the bbie ligand, the two C atoms in the ethyl group are each disordered over two positions with a site-occupancy ratio of 0.69:0.31.

(1R,2R,3R,4R,5S-2,3-Bis[(2S′-2-acetoxy-2-phenylacetoxy]-4-azido-1-[(2,4-dinitrophenylhydrazonomethyl]bicyclo[3.1.0]hexane

Directory of Open Access Journals (Sweden)

Robert McDonald

2008-02-01

Full Text Available In the title compound, C38H29N7O12, the five-membered ring adopts an envelope conformation in which the `flap' is cis to the cyclopropane group. This conformation is similar to those of other bicyclo[3.1.0]hexane analogues for which crystal structures have been reported. The absolute configuration of the stereogenic centers on the cyclopentane ring, as determined by comparison with the known configurations of the stereogenic centers in the (2S-2-acetoxy-2-phenylacetoxy groups, is 1(R, 2(R, 3(R, 4(R and 5(S. An intramolecular N—H...O hydrogen bond is present.

Bond length effects during the dissociation of O2 on Ni(1 1 1)

International Nuclear Information System (INIS)

Shuttleworth, I.G.

2015-01-01

Graphical abstract: - Highlights: • The dissociation of O 2 on Ni(1 1 1) has been investigated using the Nudged Elastic Band (NEB) technique. • An exceptional correlation has been identified between the O/Ni bond order and the O 2 bond length for a series of sterically different reaction paths. • Direct magnetic phenomena accompany these processes suggesting further mechanisms for experimental control. - Abstract: The interaction between O 2 and Ni(1 1 1) has been investigated using spin-polarised density functional theory. A series of low activation energy (E A = 103–315 meV) reaction pathways corresponding to precursor and non-precursor mediated adsorption have been identified. It has been seen that a predominantly pathway-independent correlation exists between O−Ni bond order and the O 2 bond length. This correlation demonstrates that the O−O interaction predominantly determines the bonding of this system

O2(a1Δ) quenching in O/O2/O3/CO2/He/Ar mixtures

Science.gov (United States)

Azyazov, V. N.; Mikheyev, P. A.; Postell, D.; Heaven, M. C.

2010-02-01

The development of discharge singlet oxygen generators (DSOG's) that can operate at high pressures is required for the power scaling of the discharge oxygen iodine laser. In order to achieve efficient high-pressure DSOG operation it is important to understand the mechanisms by which singlet oxygen (O2(a1Δ)) is quenched in these devices. It has been proposed that three-body deactivation processes of the type O2(a1Δ))+O+M-->2O2+M provide significant energy loss channels. To further explore these reactions the physical and reactive quenching of O2(a1Δ)) in O(3P)/O2/O3/CO2/He/Ar mixtures has been investigated. Oxygen atoms and singlet oxygen molecules were produced by the 248 nm laser photolysis of ozone. The kinetics of O2(a1Δ)) quenching were followed by observing the 1268 nm fluorescence of the O2 a1Δ-X3Ε transition. Fast quenching of O2(a1Δ)) in the presence of oxygen atoms and molecules was observed. The mechanism of the process has been examined using kinetic models, which indicate that quenching by vibrationally excited ozone is the dominant reaction.

The clinically-tested S1P receptor agonists, FTY720 and BAF312, demonstrate subtype-specific bradycardia (S1P₁ and hypertension (S1P₃ in rat.

Directory of Open Access Journals (Sweden)

Ryan M Fryer

Full Text Available Sphingosine-1-phospate (S1P and S1P receptor agonists elicit mechanism-based effects on cardiovascular function in vivo. Indeed, FTY720 (non-selective S1P(X receptor agonist produces modest hypertension in patients (2-3 mmHg in 1-yr trial as well as acute bradycardia independent of changes in blood pressure. However, the precise receptor subtypes responsible is controversial, likely dependent upon the cardiovascular response in question (e.g. bradycardia, hypertension, and perhaps even species-dependent since functional differences in rodent, rabbit, and human have been suggested. Thus, we characterized the S1P receptor subtype specificity for each compound in vitro and, in vivo, the cardiovascular effects of FTY720 and the more selective S1P₁,₅ agonist, BAF312, were tested during acute i.v. infusion in anesthetized rats and after oral administration for 10 days in telemetry-instrumented conscious rats. Acute i.v. infusion of FTY720 (0.1, 0.3, 1.0 mg/kg/20 min or BAF312 (0.5, 1.5, 5.0 mg/kg/20 min elicited acute bradycardia in anesthetized rats demonstrating an S1P₁ mediated mechanism-of-action. However, while FTY720 (0.5, 1.5, 5.0 mg/kg/d elicited dose-dependent hypertension after multiple days of oral administration in rat at clinically relevant plasma concentrations (24-hr mean blood pressure = 8.4, 12.8, 16.2 mmHg above baseline vs. 3 mmHg in vehicle controls, BAF312 (0.3, 3.0, 30.0 mg/kg/d had no significant effect on blood pressure at any dose tested suggesting that hypertension produced by FTY720 is mediated S1P₃ receptors. In summary, in vitro selectivity results in combination with studies performed in anesthetized and conscious rats administered two clinically tested S1P agonists, FTY720 or BAF312, suggest that S1P₁ receptors mediate bradycardia while hypertension is mediated by S1P₃ receptor activation.

Hierarchical MoS2 nanowires/NiCo2O4 nanosheets supported on Ni foam for high-performance asymmetric supercapacitors

Science.gov (United States)

Wen, Shiyang; Liu, Yu; Zhu, Fangfang; Shao, Rong; Xu, Wei

2018-01-01

The hierarchical MoS2 nanowires/NiCo2O4 nanosheets (MS/NCO) supercapacitor electrode materials supported on Ni foam were synthesized by a two-step hydrothermal method. The capacitance was investigated by using various electrochemical methods including cyclic voltammetry, constant-current galvanostatic charge/discharge curves and electrochemical impedance spectroscopy. The MS/NCO networks show 7 times more capacitance (7.1 F cm-2) than pure NiCo2O4 nanosheets by CV at a scan rate of 2 mV s-1. The specific capacitance of the assembled MS/NCO//active carbon (AC) asymmetric supercapacitor could reach up to 51.7 F g-1 at a current density of 1.5 A g-1. Also, the maximum energy density of 18.4 W h kg-1 at a power density of 1200.2 W kg-1 was achieved, with 98.2% specific capacitance retention after 8000 cycles. These exciting results exhibit potential application in developing energy storage devices with high energy density and high power density.

In vitro characterization of gE negative bovine herpesvirus types 1.1 (BHV-1.1 and 1.2a (BHV-1.2a Caracterização in vitro de herpes vírus bovino tipos 1.1 (BHV-1.1 e 1.2a (BHV-1.2a gE negativos

Directory of Open Access Journals (Sweden)

Fernando R. Spilki

2004-09-01

Full Text Available This study aimed the in vitro growth characterization of a previously constructed Brazilian bovine herpesvirus 1.2a with a deletion in the glycoprotein E gene (BHV-1.2a gE-. The plaque sizes, penetration and growth kinetics of the Brazilian BHV-1.2a gE- were studied and compared with the parental virus, as well as with a BHV-1.1 gE- recombinant derived from an European BHV-1.1 strain. No statistical differences were observed between the gE- recombinants and the respective parental viruses penetration assays were performed. When single step growth curves were studied, no statistical differences were observed between gE- and parental viruses. However, it was observed that both gE- viruses were excreted from cells in significantly higher titres at 11 hours post infection in comparison with parental viruses. No statistical differences were observed when plaque sizes of parental viruses or gE- viruses we analyzed separately in each cell type. However, both gE- recombinants displayed a significantly reduced plaque areas on three different cell cultures, in comparison with parental viruses, indicating that the lack of gE had the same effect on both BHV-1 subtypes, manifested by a restricted cell-to-cell spread in infected cells.O presente estudo teve como objetivo a caracterização das propriedades de crescimento in vitro de uma amostra brasileira de herpesvírus bovino tipo 1.2a que apresenta uma deleção no gene que codifica a glicoproteína E (BHV-1.2a gE-. Os tamanhos de placa, cinética de penetração e cinética de multiplicação do vírus BHV-1.2a gE- foram estudados e comparados com o vírus parental, bem como com um vírus BHV-1.1 gE- recombinante, o qual é derivado de uma amostra européia de BHV-1.1. Em termos de cinética de penetração, não foram observadas diferenças significativas quando comparados os vírus gE- com os parentais. A determinação da cinética de multiplicação não demonstrou diferenças significativas entre os

Identification of the 1s2s2p 4P5/2-->1s22s 2S1/2 magnetic quadrupole inner-shell satellite line in the Ar16+ K-shell x-ray spectrum

Science.gov (United States)

Beiersdorfer, P.; Bitter, M.; Hey, D.; Reed, K. J.

2002-09-01

We have identified the dipole-forbidden 1s2s2p 4P5/2-->1s22s 2S1/2 transition in lithiumlike Ar15+ in high-resolution K-shell x-ray emission spectra recorded at the Livermore EBIT-II electron-beam ion trap and the Princeton National Spherical Tokamak Experiment. Unlike other Ar15+ satellite lines, which can be excited by dielectronic recombination, the line is exclusively excited by electron-impact excitation. Its predicted radiative rate is comparable to that of the well-known 1s2p 3P1-->1s2 1S0 magnetic quadrupole transition in heliumlike Ar16+. As a result, it can also only be observed in low-density plasma. We present calculations of the electron-impact excitation cross sections of the innershell excited Ar15+ satellite lines, including the magnetic sublevels needed for calculating the linear line polarization. We compare these calculations to the relative magnitudes of the observed 1s2s2p-->1s22s transitions and find good agreement, confirming the identification of the lithiumlike 1s2s2p 4P5/2-->1s22s 2S1/2 magnetic quadrupole line.

Chemistry of CCl 4 on Fe 3O 4(1 1 1)-(2 × 2) surfaces in the presence of adsorbed D 2O studied by temperature programmed desorption

Science.gov (United States)

Adib, K.; Totir, G. G.; Fitts, J. P.; Rim, K. T.; Mueller, T.; Flynn, G. W.; Joyce, S. A.; Osgood, R. M.

2003-07-01

Temperature programmed desorption (TPD) was used to study surface reactions of Fe 3O 4(1 1 1)-(2 × 2) sequentially exposed, at ˜100 K, to vapor-phase D 2O and CCl 4. Previous TPD and XPS results have indicated that in the absence of D 2O, CCl 4 dissociatively adsorbs on Fe 3O 4(1 1 1) producing chemisorbed Cl and CCl 2. Subsequent heating of the surface results in abstraction of lattice iron and oxygen atoms and causes them to desorb as FeCl 2 and OCCl 2, respectively. This study shows that when this Fe 3O 4 surface is exposed only to D 2O, TPD measures a rich surface chemistry with multiple desorption events extending as high as ˜800 K, indicating dissociative adsorption of D 2O on the Fe 3O 4(1 1 1) surface. After sequential exposure to D 2O and then CCl 4, the production of FeCl 2 and OCCl 2 from adsorbed CCl 4 is suppressed, indicating that D 2O fragments block the surface reactive sites.

Determination of the 1s2{\\ell }2{{\\ell }}^{\\prime } state production ratios {{}^{4}P}^{o}/{}^{2}P, {}^{2}D/{}^{2}P and {{}^{2}P}_{+}/{{}^{2}P}_{-} from fast (1{s}^{2},1s2s\\,{}^{3}S) mixed-state He-like ion beams in collisions with H2 targets

Science.gov (United States)

Benis, E. P.; Zouros, T. J. M.

2016-12-01

New results are presented on the ratio {R}m={σ }{T2p}( {}4P)/{σ }{T2p}({}2P) concerning the production cross sections of Li-like 1s2s2p quartet and doublet P states formed in energetic ion-atom collisions by single 2p electron transfer to the metastable 1s2s {}3S component of the He-like ion beam. Spin statistics predict a value of R m = 2 independent of the collision system in disagreement with most reported measurements of {R}m≃ 1{--}9. A new experimental approach is presented for the evaluation of R m having some practical advantages over earlier approaches. It also allows for the determination of the separate contributions of ground- and metastable-state beam components to the measured spectra. Applying our technique to zero-degree Auger projectile spectra from 4.5 MeV {{{B}}}3+ (Benis et al 2002 Phys. Rev. A 65 064701) and 25.3 MeV {{{F}}}7+ (Zamkov et al 2002 Phys. Rev. A 65 062706) mixed state (1{s}2 {}1S,1s2s {}3S) He-like ion collisions with H2 targets, we report new values of {R}m=3.5+/- 0.4 for boron and {R}m=1.8+/- 0.3 for fluorine. In addition, the ratios of {}2D/{}2P and {{}2P}+/{{}2P}- populations from either the metastable and/or ground state beam component, also relevant to this analysis, are evaluated and compared to previously reported results for carbon collisions on helium (Strohschein et al 2008 Phys. Rev. A 77 022706) including a critical comparison to theory.

Preparation and electrical properties of (1 - x)Sr(Fe{sub 1/2}Nb{sub 1/2})O{sub 3}-xPbTiO{sub 3} ferroelectric ceramics

Energy Technology Data Exchange (ETDEWEB)

Fang Bijun [School of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou, Jiangsu 213164 (China)], E-mail: fangbj@em.jpu.edu.cn; Cheng Zhenquan; Sun Renbing; Ding Chenlu [School of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou, Jiangsu 213164 (China)

2009-03-05

(1 - x)Sr(Fe{sub 1/2}Nb{sub 1/2})O{sub 3}-xPbTiO{sub 3} (SFN-PT) ferroelectric ceramics were prepared by conventional solid-state reaction method via the wolframite precursor route. X-ray diffraction (XRD) measurement confirmed that the synthesized SFN-PT ceramics are of pure perovskite structure. With the increase of the concentration of PbTiO{sub 3} (PT), crystal structure of the sintered SFN-PT ceramics changes from rhombohedral phase to tetragonal phase. Dielectric response of the SFN-PT ceramics changes from diffused and broad dielectric peaks to relatively sharp ones accompanied by the increase of the temperature of dielectric maximum (T{sub m}). Small content of MnO{sub 2} or Li{sub 2}CO{sub 3} doping can greatly decrease the dielectric loss of the SFN-PT ceramics, furthermore, the abnormal increase of dielectric constant and loss tangent in the paraelectric phase is suppressed accordingly. Typical P-E hysteresis loops are observed in the SFN-PT ceramics, however, the saturate polarization (P{sub s}) is small. MnO{sub 2} or Li{sub 2}CO{sub 3} doping can greatly decrease the coercive field (E{sub c}) of the SFN-PT ceramics accompanied by large increase of P{sub s}. Piezoelectric constant d{sub 33} of the SFN-PT ceramics is small except for SFN30-PT70 ceramics, which reaches 22pC/N.

Synthesis and crystal structures of two α-bromoamides, (2'R,1S,2S)-N(2-bromopropanoyl)-2-amino-1-phenylpropane-1,3-diol and (2'S,5S,6S)-N(2-bromopropanoyl)-5-amino-6-phenyl-2-oxo-1,3,2-dioxathiane

International Nuclear Information System (INIS)

English, R.B.; Liddell, R.J.; Whiteley, C.G.

1987-01-01

One pair of diastereomeric bromoamides, (2'R,1S,2S)- and (2'S,1S,2S)-N(2-bromopropanoyl)-2-amino-1-phenylpropane-1,3-diol have been synthesized from ethyl 2-bromopropionate and an optically active amino-diol. The crystal structures of both were determined from single-crystal X-ray analyses. Both compounds are orthorhombic with space group P2 1 2 1 2 1 with Z = 4 in a unit cell of dimensions a 22,124(5),b 12,812(5), and c 4,886(5)A and a 15,510(5), b 9,707(5), and c 9,457(5)A. The proton chemical shifts of the groups attached to the asymmetric centre C(2'), and consequently, the identification of the configuration of the molecules, were resolved with the help of high-resolution nuclear magnetic resonance

Photoemission study of absorption mechanisms in Bi2.0Sr1.8Ca0.8La0.3Cu2.1O8+δ, BaBiO3, and Nd1.85Ce0.15CuO4

International Nuclear Information System (INIS)

Lindberg, P.A.P.; Shen, Z.; Wells, B.O.; Dessau, D.S.; Ellis, W.P.; Borg, A.; Kang, J.; Mitzi, D.B.; Lindau, I.

1989-01-01

Photoemission measurements in the constant-final-state (absorption) mode were performed on three different classes of high-temperature superconductors Bi 2.0 Sr 1.8 Ca 0.8 La 0.3 Cu 2.1 O 8+δ , BaBiO 3 , and Nd 1.85 Ce 0.15 CuO 4 using synchrotron radiation from 20 to 200 eV. Absorption signals from all elements but Ce are identified. The results firmly show that the Bi 6s electrons are more delocalized in BaBiO 3 than in Bi 2.0 Sr 1.8 Ca 0.8 La 0.3 Cu 2.1 O 8+δ , in agreement with the results of band-structure calculations. Differences in the absorption signals due to O and Bi excitations between BaBiO 3 and Bi 2.0 Sr 1.8 Ca 0.8 La 0.3 Cu 2.1 O 8+δ are discussed. Delayed absorption onsets attributed to giant resonances (Ba 4d→4f, La 4d→4f, and Nd 4d→4f transitions) are also reported

Stability of Cd_1_–_xZn_xO_yS_1_–_y Quaternary Alloys Assessed with First-Principles Calculations

International Nuclear Information System (INIS)

Varley, Joel B.; He, Xiaoqing; Rockett, Angus; Lordi, Vincenzo

2017-01-01

One route to decreasing the absorption in CdS buffer layers in Cu(In,Ga)Se_2 and Cu_2ZnSn(S,Se)_4 thin-film photovoltaics is by alloying. Here we use first-principles calculations based on hybrid functionals to assess the energetics and stability of quaternary Cd, Zn, O, and S (Cd_1_–_xZn_xO_yS_1_–_y) alloys within a regular solution model. Our results identify that full miscibility of most Cd_1_–_xZn_xO_yS_1_–_y compositions and even binaries like Zn(O,S) is outside typical photovoltaic processing conditions. Finally, the results suggest that the tendency for phase separation of the oxysulfides may drive the nucleation of other phases such as sulfates that have been increasingly observed in oxygenated CdS and ZnS.

QED based on self-energy: The relativistic 2S1/2 → 1S1/2+1γ decay rates of hydrogenlike atoms

International Nuclear Information System (INIS)

Barut, A.O.; Salamin, Y.I.

1989-07-01

Within the framework of the recently advanced formulation of QED based on self-energy, we calculate the relativistic rates of the 2S 1/2 → 1S 1/2 +1γ transition in the hydrogen isoelectronic sequence for values of Z ranging between 1 and 92. We compare our results with those of Johnson (Phys. Rev. Lett. 29, 1123 (1972)) and Parpia and Johnson (Phys. Rev. A 26, 1142 (1982)) and find them to be in good agreement with both. (author). 12 refs, 1 tab

Preparation of O/I1-type Emulsions and S/I1-type Dispersions Encapsulating UV-Absorbing Agents.

Science.gov (United States)

Aramaki, Kenji; Kimura, Minami; Masuda, Kazuki

2015-01-01

Oil-in-cubic phase (O/I1) emulsions encapsulating the cosmetic UV absorbing agents 2-ethylhexyl 4-methoxycinnamate (EHMC), 2-ethylhexyl 2-cyano-3,3-diphenylacrylate (octocrylene, OCR) and 1-(4-tertbutylphenyl)-3-(4-methoxyphenyl)-1,3-propanedione (Avobenzone, TBMP) were prepared by vortex mixing accompanied by a heating-cooling process. A ternary phase diagram in a water/C12EO25/EHMC system at 25°C was constructed and the two-phase equilibrium of an oil phase and an I1 phase, which is necessary to prepare the O/I1-type emulsions, was confirmed. Also, the melting of the I1 phase into a fluid micellar solution phase was confirmed, allowing emulsification by a heating-cooling process. The O/I1-type emulsions were formulated in the ternary system as well as a quaternary system. The four-component system contained an additional cosolvent, isopropyl myristate (IPM). The use of the cosolvent allows the use of reduced amounts of EHMC, which is desirable because EHMC can cause temporary skin irritation. Formulation of the O/I1-type emulsions with other UV absorbing agents (OCR and TBMP) was also possible using the same emulsification method. When IPM was changed to tripalmitin, which has a melting point greater than room temperature, a solid-oil dispersion in I1 phase was formed. We have termed this a "solidin-cubic phase (S/I1) type dispersion". These novel emulsions have not been reported previously. The UV absorbability of the O/I1-type emulsions and S/I1-type dispersions that encapsulate the UV absorbing agents was confirmed by measurement of UV absorption spectra.

New Pb(Mg1/3Nb2/3)O3-Pb(In1/2Nb1/2)O3-PbZrO3-PbTiO3 Quaternary Ceramics: Morphotropic Phase Boundary Design and Electrical Properties.

Science.gov (United States)

Luo, Nengneng; Zhang, Shujun; Li, Qiang; Xu, Chao; Yang, Zhanlue; Yan, Qingfeng; Zhang, Yiling; Shrout, Thomas R

2016-06-22

Four series of Pb(Mg1/3Nb2/3)O3-Pb(In1/2Nb1/2)O3-PbZrO3-PbTiO3 (PMN-PIN-PZ-PT) quaternary ceramics with compositions located at the morphotropic phase boundary (MPB) regions were prepared. The MPBs of the multicomponent system were predicted using a linear combination rule and experimentally confirmed by X-ray powder diffraction and electrical measurement. The positions of MPBs in multicomponent systems were found in linear correlation with the tolerance factor and ionic radii of non-PT end-members. The phase structure, piezoelectric coefficient, electromechanical coupling coefficient, unipolar strains, and dielectric properties of as-prepared ceramics were systematically investigated. The largest d33s were obtained at S36.8, L37.4, M39.6, and N35.8, with the corresponding values of 580, 450, 420, and 530 pC/N, respectively, while the largest kps were found at S34.8, L37.4, M39.6, and N35.8, with the respective values of 0.54, 0.50, 0.47, and 0.53. The largest unipolar strain Smax and high-field piezoelectric strain coefficients d33* were also observed around the respective MPB regions. The rhombohedral-to-tetragonal phase transition temperature Trt increased with increasing PIN and PZ contents. Of particular importance is that high Trt of 140-197 °C was achieved in the M series with PZ and PIN contents being around 0.208 and 0.158, which will broaden the temperature usage range.

Study of TiO2(1 1 0)-p(1x1), p(1x2) and p(1x3) surface structures by impact collision ion scattering spectroscopy (ICISS)

International Nuclear Information System (INIS)

Asari, E.; Souda, R.

2000-01-01

The surface structure of TiO 2 (1 1 0)-p(1x1), p(1x2) and p(1x3) were studied using impact collision ion scattering spectroscopy (ICISS). We found that (i) the height of bridging oxygen for the p(1x1) is comparative to that of bulk structure, (ii) the p(1x2) surface has the added Ti 2 O 3 unit rows proposed by Onishi et al. and also the oxygen atoms rows between Ti 2 O 3 unit rows and (iii) the p(1x3) surface is constructed with the same added Ti 2 O 3 unit rows as that in the p(1x2) surface, but the bridging oxygen rows exist between the Ti 2 O 3 unit rows

Sphingosine 1-phosphate (S1P) induces COX-2 expression and PGE2 formation via S1P receptor 2 in renal mesangial cells.

Science.gov (United States)

Völzke, Anja; Koch, Alexander; Meyer Zu Heringdorf, Dagmar; Huwiler, Andrea; Pfeilschifter, Josef

2014-01-01

Understanding the mechanisms of sphingosine 1-phosphate (S1P)-induced cyclooxygenase (COX)-2 expression and prostaglandin E2 (PGE2) formation in renal mesangial cells may provide potential therapeutic targets to treat inflammatory glomerular diseases. Thus, we evaluated the S1P-dependent signaling mechanisms which are responsible for enhanced COX-2 expression and PGE2 formation in rat mesangial cells under basal conditions. Furthermore, we investigated whether these mechanisms are operative in the presence of angiotensin II (Ang II) and of the pro-inflammatory cytokine interleukin-1β (IL-1β). Treatment of rat and human mesangial cells with S1P led to concentration-dependent enhanced expression of COX-2. Pharmacological and molecular biology approaches revealed that the S1P-dependent increase of COX-2 mRNA and protein expression was mediated via activation of S1P receptor 2 (S1P2). Further, inhibition of Gi and p42/p44 MAPK signaling, both downstream of S1P2, abolished the S1P-induced COX-2 expression. In addition, S1P/S1P2-dependent upregulation of COX-2 led to significantly elevated PGE2 levels, which were further potentiated in the presence of Ang II and IL-1β. A functional consequence downstream of S1P/S1P2 signaling is mesangial cell migration that is stimulated by S1P. Interestingly, inhibition of COX-2 by celecoxib and SC-236 completely abolished the migratory response. Overall, our results demonstrate that extracellular S1P induces COX-2 expression via activation of S1P2 and subsequent Gi and p42/p44 MAPK-dependent signaling in renal mesangial cells leading to enhanced PGE2 formation and cell migration that essentially requires COX-2. Thus, targeting S1P/S1P2 signaling pathways might be a novel strategy to treat renal inflammatory diseases. © 2013.

EFEITOS QUALITATIVO E QUANTITATIVO DE APLICAÇÃO DO ZINCO NO CAPIM TANZÂNIA-1 QUALITIVE AND QUANTITATIVE EFFECTS OF THE ZINC SULPHATE APPLICATION ON TANZÂNIA-1 GRASS

Directory of Open Access Journals (Sweden)

Cideon Donizete de Faria

2007-09-01

Full Text Available

O micronutriente mais carente nas áreas pastagens e nos campos agrícolas da região do cerrado é o zinco, devido ao pobre material original de seus solos à baixa tradição de uso de sais solúveis de zinco como fertilizante nas culturas. O presente experimento foi conduzido na Embrapa Arroz e Feijão em um latossolo vermelho-escuro, com o objetivo de avaliar o efeito das doses 0, 10, 20, 40 e 80 kg ha^-1 de sulfato de zinco na produtividade, qualidade e composição química do Tanzânia-1. O solo foi preparado com uma gradagem pesada no início da estação chuvosa, após dez dias foi realizada uma aração com arado de aivecas. Com a adubação básica foram aplicados 20 kg de N, 50 kg de P₂O₅ e 30 kg de K₂O ha^-1 como sulfato de amônio, Yoorin comercial e cloreto de potássio, respectivamente. A altura das plantas e o número de perfilhos foram observados aos 60 dias após a germinação e, após a colheita, foram avaliados o peso de massa verde, matéria seca, proteína bruta, fibra em detergente neutro e minerais. Embora não significativa, a dose de 20 kg ha^-1 de sulfato de zinco foi a que mais influenciou, qualitativa e quantitativamente, a forragem produzida.

PALAVRAS-CHAVE: Pastagem; solo; fertilidade; perfilhamento; proteína seca.

The zinc is the most lacking micronutrient in the pasture areas and field crops of the savannah region due to the poor original material of the soil and also due to the little use tradition ofsoluble salts of zinc as fertilizer to the crops. The present experiment was carried out at Embrapa Rice and Beans in a dark red

Synthesis of (R,S)-[2,3-{sup 13}C{sub 2}]-1-(1`-methyl-2`-pyrrolidinyl)propan-2-one; {l_brace}(R,S)-[2`,3`-{sup 13}C{sub 2}]hygrinePound right bracePound

Energy Technology Data Exchange (ETDEWEB)

Abraham, T.W.; Leete, Edward [Minnesota Univ., Minneapolis, MN (United States). Dept. of Chemistry

1996-05-01

2-Ethoxy-1-methyl-5-pyrrolidinone (1) was reacted with ethyl [3,4-{sup 13}C{sub 2}]-acetoacetate (2) in the presence of TiCl{sub 4} to give ethyl [3,4-{sup 13}C{sub 2}]-2-(1`-methyl-5`-oxo-2`-pyrrolidinyl)-3-oxobutanoate (3) in 85% yield. Decarboethoxylation of ethyl [3,4-{sup 13}C{sub 2}]-2-(1`-methyl-5`-oxo-2`-pyrrolidinyl)-3-oxobutan-oate (3) was accomplished using NaCl and H{sub 2}O in DMSO to give (R,S)-[2,3-{sup 13}C{sub 2}]-1-(1`-methyl-5`-oxo-2`-pyrrolidinyl)propan-2-o ne (4) in 91% yield. Protection of the ketone as a ketal (ethylene glycol, H{sup +}), followed by reduction of the amide to the amine using LiAlH{sub 4} and subsequent deprotection of the ketal gave (R,S)-[2,3-{sup 13}C{sub 2}]-1-(1`-methyl-2`-pyrrolidinyl)propan-2-one ((R,s)-[2`, 3`-{sup 13}C{sub 2}]Hygrine) (8) in 78% yield. (61% overall yield from ethyl [3,4-{sup 13}C{sub 2}]acetoacetate). (Author).

Experimental study and thermodynamic assessment of the ZrO2-DyO1.5 system

International Nuclear Information System (INIS)

Wang, Chong; Zinkevich, M.; Aldinger, F.; Stuttgart Univ.

2007-01-01

The phase equilibria and thermodynamic properties in the ZrO 2 -DyO 1.5 system have been studied using the experimental methods of X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, differential thermal analysis and high temperature drop calorimetry. The tetragonal + fluorite and fluorite + C-Dy 2 O 3 phase equilibria between 1400 C and 1700 C have been determined, together with the enthalpy increments of the materials with 30 mol.% and 50 mol.% DyO 1.5 in the temperature range 200-1400 C. Furthermore, the martensitic transformation temperatures (A s ,M s ) have been measured for the samples with 1 and 2 mol.% DyO 1.5 . Finally, thermodynamic assessment has been carried out using the experimental results obtained and literature data. (orig.)

Syntheses and modulations in the chromatin contents of histones H1/sup o/ and H1 during G1 and S phases in Chinese hamsters cells

International Nuclear Information System (INIS)

D'Anna, J.A.; Gurley, L.R.; Tobey, R.A.

1982-01-01

Flow cytometry, conventional autoradiography, and autoradiography employing high concentrations of high specific activity [ 3 H]thymidine indicate that (1) treatment of Chinese hamster ovary (line CHO) cells with butyrate truly blocks cells in G 1 and (2) cells blocked in G 1 by isoleucine deprivation remain blocked in G 1 when they are released into complete medium containing butyrate. Measurements of H1/sup o/ content relative to core histones and H1/sup o/:H1 ratios indicate that H1/sup o/ is enhanced somewhat in G 1 cells arrested by isoleucine deprivation; however, (1) treatment with butyrate greatly increases the H1/sup o/ content in G 1 -blocked cells, and (2) the enhancement is very sensitive to butyrate concentration. Measurements of relative histone contents in the isolated chromatin of synchronized cultures also suggest that the acid-soluble content of histone H1 (relative to core histones) becomes greatly depleted in the isolated chromatin when synchronized cells are blocked in early S phase by sequential use of isoleucine deprivation and hydroxyurea blockade. We also have measured [ 3 H]lysine incorporation, various protein ratios, and relative rates of deposition of newly synthesized H1/sup o/, H1, and H4 onto chromatin during G 1 and S in the absence of butyrate. The results suggest a dynamic picture of chromatin organization in which (1) newly synthesized histone H1/sup o/ binds to chromatin during traverse of G 1 and S phases and (2) histone H1 dissociates from (or becomes loosely bound to) chromatin during prolonged early S-phase block with hydroxyurea

S1 new

Indian Academy of Sciences (India)

DMSO Release. ATRi Release. Only EdU. Only ATRi. *. *. *. n.s. n.s. B. 0. 10. 20. 30. 40. 50. 60. 15 mins 20 mins 30 mins 40 mins 60 mins. % o. f p. R a d. 1. 7 p o s tiv e c e lls. HU + DMSO. HU + ATRi. *. *. *. *. n.s. 0. 0. 20. 30. 40. 50. 60. 70. 80. 2 h Treatment. 24 h Treatment γ. H. 2. A. X. P o s i t i v e. N u c l e i. HU+DMSO ...

Ionic Liquid-Assisted Synthesis of Nanoscale (MoS2)x(SnO2)1-x on Reduced Graphene Oxide for the Electrocatalytic Hydrogen Evolution Reaction.

Science.gov (United States)

Ravula, Sudhir; Zhang, Chi; Essner, Jeremy B; Robertson, J David; Lin, Jian; Baker, Gary A

2017-03-08

Layered transition metal dichalcogenides (TMDs) have attracted increased attention due to their enhanced hydrogen evolution reaction (HER) performance. More specifically, ternary TMD nanohybrids, such as MoS 2(1-x) Se 2x or bimetallic sulfides, have arisen as promising electrocatalysts compared to MoS 2 and MoSe 2 due to their electronic, morphologic, and size tunabilities. Herein, we report the successful synthesis of few-layered MoS 2 /rGO, SnS 2 /rGO, and (MoS 2 ) x (SnO 2 ) 1-x /rGO nanohybrids anchored on reduced graphene oxide (rGO) through a facile hydrothermal reaction in the presence of ionic liquids as stabilizing, delayering agents. Spectroscopic and microscopic techniques (electron microscopy, X-ray diffraction, Raman spectroscopy, neutron activation analysis, and UV-vis spectrophotometry) are used to validate the hierarchical properties, phase identity, and the smooth compositional tunability of the (MoS 2 ) x (SnO 2 ) 1-x /rGO nanohybrids. Linear sweep voltammetry measurements reveal that incorporation of Sn into the ternary nanohybrids (as a discrete SnO 2 phase) greatly reduces the overpotential by 90-130 mV relative to the MoS 2 electrocatalyst. Significantly, the (MoS 2 ) 0.6 (SnO 2 ) 0.4 /rGO nanohybrid displays superior catalytic performance over MoS 2 alone, exhibiting a low overpotential (η 10 ) of 263 ± 5 mV and a small Tafel slope of 50.8 mV dec -1 . The hybrid catalyst shows high stability for the HER in acidic solutions, with negligible activity loss after 1000 cycles. The hierarchical structures and large surface areas possessing exposed, active edge sites make few-layered (MoS 2 ) x (SnO 2 ) 1-x /rGO nanohybrids promising nonprecious metal electrocatalysts for the HER.

Synthesis, crystal structure, and spectroscopic characterization of trans-bis[(mu-1,3-bis(4-pyridyl)propane)(mu-(3-thiopheneacetate-O))(3-thiopheneacetate-O)]dicopper(II), [[Cu2(O2CCH2C4H3S)4mu-(BPP)2

Science.gov (United States)

Marinho, Maria Vanda; Yoshida, Maria Irene; Guedes, Kassilio J; Krambrock, Klaus; Bortoluzzi, Adailton J; Hörner, Manfredo; Machado, Flávia C; Teles, Wagner M

2004-02-23

From the reaction between a dinuclear paddle-wheel carboxylate, namely [Cu2mu-(O2CCH2C4H3S)4] (1), and the flexible ligand 1,3-bis(4-pyridyl)propane (BPP) a neutral 2-D coordination polymer [[Cu2(O2CCH2C4H3S)4mu-(BPP)2

Charge Fluctuations in the NdO1-xFxBiS2 Superconductors

Science.gov (United States)

Athauda, Anushika; Mizuguchi, Yoshikazu; Nagao, Masanori; Neuefeind, Joerg; Louca, Despina

2017-12-01

The local atomic structure of superconducting NdO1-xFxBiS2 (x = 0.2 and 0.4) is investigated using neutron diffraction and the pair density function analysis technique. In the non-superconducting x = 0.2 composition, ferrodistortive displacements of the pyramidal sulfur ions break the tetragonal symmetry and a superlattice structure emerges with peaks appearing at h + k odd reflections superimposed on the even reflections of the P4/nmm symmetry. In the superconducting x = 0.4 composition, similar ferrodistortive displacements are observed but with different magnitudes coupled with in-plane Bi distortions which are indicative of charge fluctuations.

Neutron investigation of Ru-doped Nd1/2Ca1/2MnO3. Comparison with Cr-doped Nd1/2Ca1/2MnO3

International Nuclear Information System (INIS)

Moritomo, Yutaka; Nonobe, Toshihiko; Machida, Akihiko; Ohoyama, Kenji

2002-01-01

Lattice and magnetic properties are investigated for 3% Ru- and Cr-doped Nd 1/2 Ca 1/2 MnO 3 . The parent Nd 1/2 Ca 1/2 MnO 3 is a charge-ordered insulator (T CO =250K). With decreasing temperature below ≅210K, these compounds are separated into two perovskite phases, that is, the long-c and short-c phases. The long-c region shows a ferromagnetic transition at T C ≅210K for the Ru-doped compound and ≅130K for the Cr-doped compound, while the short-c region shows antiferromagnetic transition at T N ≅150K for Ru and ≅110K for Cr. We discuss the origin of the enhanced T C for the Ru-doped compound in terms of the effective one-electron bandwidth W of the e g -band. (author)

QED based on self-energy: The relativistic 2S1/2→1S1/2+1γ decay rates of hydrogenlike atoms

International Nuclear Information System (INIS)

Barut, A.O.; Salamin, Y.I.

1991-01-01

Within the framework of the recently advanced formulation of QED based on self-energy, we calculate the relativistic rates of the 2S 1/2 →1S 1/2 +1γ transition in the hydrogen isoelectronic sequence for values of Z ranging between 1 and 92. We compare our results with those of Johnson [Phys. Rev. Lett. 29, 1123 (1972)] and Parpia and Johnson [Phys. Rev. A 26, 1142 (1982)], analytically and numerically. Although the two approaches are quite different, the formulas for decay rates are shown to be equivalent

Data of evolutionary structure change: 1AIFA-2AI0O [Confc[Archive

Lifescience Database Archive (English)

Full Text Available s_2> 0 n> 1AIF A...n> 1AIFAn> VSSSI----SSSNL n> 2AI0 n>O 2AI...1AIFA-2AI0O 1AIF 2AI0 A O DIQLTQSPAFMAASPGEKVTITCSVSSSI----SSSNLH...e>SER CA 251 SER CA 276 SER CA 258 ASN CA 337 LEU CA 410

Pregnane X receptor-dependent induction of the CYP3A4 gene by o,p'-1,1,1,-trichloro-2,2-bis (p-chlorophenyl)ethane.

Science.gov (United States)

Medina-Díaz, Irma M; Arteaga-Illán, Georgina; de León, Mario Bermudez; Cisneros, Bulmaro; Sierra-Santoyo, Adolfo; Vega, Libia; Gonzalez, Frank J; Elizondo, Guillermo

2007-01-01

CYP3A4, the predominant cytochrome P450 (P450) expressed in human liver and intestine, contributes to the metabolism of approximately half the drugs in clinical use today. CYP3A4 catalyzes the 6beta-hydroxylation of a number of steroid hormones and is involved in the bioactivation of environmental procarcinogens. The expression of CYP3A4 is affected by several stimuli, including environmental factors such as insecticides and pesticides. The o,p'-1,1,1,-trichloro-2,2-bis (p-chlorophenyl)ethane (DDT) isomer of DDT comprises approximately 20% of technical grade DDT, which is an organochloride pesticide. We have recently shown that o,p'-DDT exposure increases CYP3A4 mRNA levels in HepG2 cells. To determine the mechanism by which o,p'-DDT induces CYP3A4 expression, transactivation and electrophoretic mobility shift assays were carried out, revealing that o,p'-DDT activates the CYP3A4 gene promoter through the pregnane X receptor (PXR). CYP3A4 gene promoter activation resulted in both an increase in CYP3A4 mRNA levels and an increase in the total CYP3A4 activity in HepG2 cells. We also observed induction of CYP3A4 and mouse Cyp3a11 mRNA in the intestine of CYP3A4-transgenic mice after exposure to 1 mg/kg o,p'-DDT. At higher doses, a decrease of CYP3A4 inducibility was observed together with an increase in levels of interleukin 6 mRNA, a proinflammatory cytokine that strongly represses CYP3A4 transcription. The present study indicates that regulation of other genes under PXR control may be altered by o,p'-DDT exposure.

Temperature-programmed desorption study of NO reactions on rutile TiO2(110)-1×1

Energy Technology Data Exchange (ETDEWEB)

Kim, Boseong; Dohnalek, Zdenek; Szanyi, Janos; Kay, Bruce D.; Kim, Yu Kwon

2016-10-01

Systematic temperature-programmed desorption (TPD) studies of NO adsorption and reactions on rutile TiO2(110)-1×1 surface reveal several distinct reaction channels in a temperature range of 50 – 500 K. NO readily reacts on TiO2(110) to form N2O which desorbs between 50 and 200 K (LT N2O channels), which leaves the TiO2 surface populated with adsorbed oxygen atoms (Oa) as a byproduct of N2O formation. In addition, we observe simultaneous desorption peaks of NO and N2O at 270 K (HT1 N2O) and 400 K (HT2 N2O), respectively, both of which are attributed to reaction-limited processes. No N-derived reaction product desorbs from TiO2(110) surface above 500 K or higher, while the surface may be populated with Oa’s and oxidized products such as NO2 and NO3. The adsorbate-free TiO2 surface with oxygen vacancies can be regenerated by prolonged annealing at 850 K or higher. Detailed analysis of the three N2O desorption yields reveals that the surface species for the HT channels are likely to be various forms of NO dimers.

Universal behavior of magnetocaloric effect in a layered perovskite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} single crystal

Energy Technology Data Exchange (ETDEWEB)

Thanh, Tran Dang, E-mail: thanhxraylab@yahoo.com [Institute of Materials Science, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi (Viet Nam); Manh, T.V.; Ho, T.A. [Department of Physics, Chungbuk National University, Cheongju 361-763 (Korea, Republic of); Telegin, Andrey [Department of Magnetic Semiconductors, Institute of Metal Physics, RAS (Russian Federation); Phan, T.L. [Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin 449-791 (Korea, Republic of); Yu, S.C., E-mail: scyu@chungbuk.ac.kr [Department of Physics, Chungbuk National University, Cheongju 361-763 (Korea, Republic of)

2016-04-01

In this paper, we present a detailed analysis on temperature and magnetic field dependences of the magnetic entropy change (ΔS{sub m}) near the ferromagnetic (FM)–paramagnetic (PM) phase transition of a La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} single crystal. Experimental results reveal the material exhibiting a FM–PM phase transition at T{sub C}=85 K, and belongs to a second-order phase transition (SOPT). Around T{sub C}, −ΔS{sub m} reaches the maximum value (|ΔS{sub max}|), which increases with increasing an applied magnetic field change, ΔH. The |ΔS{sub max}| values found are about 0.93, 1.73, 2.38, 2.91, and 3.33 J kg{sup −1} K{sup −1} for ΔH=10, 20, 30, 40, and 50 kOe, respectively. However, the peak position of the −ΔS{sub m}(T) curves is effectively shifted to higher temperatures when ΔH increases. Additionally, the ΔS{sub m}(T) curves measured at different ΔH values do not collapse into a universal curve when they are normalized to their respective ΔS{sub max} value, and Prod. Type: rescaled the temperature axis with θ{sub 1}=(T−T{sub C})/(T{sub r}−T{sub C}) for a reference temperature T{sub r}>T{sub C} or T{sub r}1} and T{sub r2}, with θ{sub 2}=−(T−T{sub C})/(T{sub r1}−T{sub C}) for T≤T{sub C} and θ{sub 2}=(T−T{sub C})/(T{sub r2}−T{sub C}) for T>T{sub C}.

Emissions in potassium vapour under 4S1/2-7S1/2 two-photon nsec excitation

International Nuclear Information System (INIS)

Pentaris, D.; Chatzikyriakos, G.; Armyras, A.; Efthimiopoulos, T.

2010-01-01

The two-photon excitation of 4S 1/2 -7S 1/2 transition of potassium atoms is studied. Several coherent emissions and processes are possible, such as parametric four-wave (PFWM), parametric six-wave (PSWM) mixing and competition with the stimulated hyper Raman (SHRS) and the amplified spontaneous emission (ASE). The radiations at the transitions 6P 3/2,1/2 -4S 1/2 , 6S 1/2 -4P 3/2,1/2 and 5P 3/2,1/2 -4S 1/2 are emitted only in the forward direction (indicating a parametric process), while the radiation at the transition 4P 3/2,1/2 -4S 1/2 is emitted in the forward and in the backward direction, indicating an ASE process.

Adsorption and dissociation of H2O on Al(1 1 1) surface by density functional theory calculation

International Nuclear Information System (INIS)

Guo, F.Y.; Long, C.G.; Zhang, J.; Zhang, Z.; Liu, C.H.; Yu, K.

2015-01-01

Highlights: • O 2 on Al(1 1 1) surface can spontaneously dissociate, but H 2 O can not. • H 2 O, OH and H on top sites are favorable on Al(1 1 1) surface. • O on the hollow (fcc) site is preferred. • O which plays a key role in the dissociate reaction of H 2 O. - Abstract: Using the first-principles calculations method based on the density functional theory, we systematically study the adsorption behavior of a single molecular H 2 O on a clean and a pre-adsorbed O atom Al(1 1 1) surface, and also its corresponding dissociation reactions. The equilibrium configuration on top, bridge, and hollow (fcc and hcp) site were determined by relaxation of the system relaxation. The adsorptions of H 2 O, OH and H on top sites are favorable on the Al(1 1 1) surface, while that of O on the hollow (fcc) site is preferred. The results show that the hydrogen atom dissociating from H 2 O needs a 248.32 kJ/mol of energy on clean Al(1 1 1) surface, while the dissociating energy decreases to 128.53 kJ/mol with the aid of the O absorption. On the other hand, these phenomena indicate that the dehydrogenated reaction energy barrier of the pre-adsorbed O on metal surface is lower than that of on a clean one, because O can promote the dehydrogenation of H 2 O

O2(b1∑+g) relaxation in active medium of oxygen-iodine laser

Science.gov (United States)

Tolstov, G. I.; Zagidullin, M. V.; Khvatov, N. A.; Medvedkov, I. A.; Mikheyev, P. A.

2018-04-01

Rate constants for the removal of O2 b1∑+g by collisions with O2, N2, CO2 and H2O have been determined at temperature 297 K. O2(b1 ∑+g) was excited by pulses from a tunable dye laser, and the deactivation kinetics were followed by observing the temporal behavior of the b1∑+g - X3∑-g fluorescence. The removal rate constants for CO2, N2 and H2O were not strongly dependent on temperature, and could be represented by the expressions kCO2=(1.8+/-0.05)×10-16 kN2=(2.2 +/- 0.2)×10-15, and kH2O=(6.12+/-0.67)×10-12 cm3 molecule-1 s-1. Rate constant for O2(b1∑+ ) removal by O2(X), being orders of magnitude lower, represented by the fitted expression kO2=(3.67 +/- 0.06)×10-17 cm3 molecule-1 s-1. All of the rate constants measured at room temperature were found to be in good agreement with previously reported values.

O1, P1, N2 models of the global ocean tide on an elastic earth plus surface potential and spherical harmonic decompositions for M2, S2, and K1

Science.gov (United States)

Parke, M. E.

1982-01-01

The models of M2, S2, and K1 presented in Parke and Hendershott (1980) are supplemented with models of O1, P1, and N2. The models satisfy specified elevation boundary conditions and are generated by fighting a small number of test functions to island data. Maps are presented of the geocentric tide, the induced free space potential, the induced vertical component of the solid earth tide, and the induced vertical component of the gravitational field for each new component. Maps of the tidal potential seen by an observer fixed to the surface of the solid earth are also presented for all six constituents. Spherical harmonic coefficients up to order four and the rms magnitude of the coefficients to order fifteen are presented for each constituent. The rms magnitudes of the P1 and K1 coefficients normalized by their respective equilibrium amplitudes are compared to determine the effect of the diurnal core resonance.

Study of the structural and thermal stability of Li0.3Co2/3Ni1/6Mn1/6O2

International Nuclear Information System (INIS)

Mahmoud, Abdelfattah; Saadoune, Ismael; Difi, Siham; Sougrati, Moulay Tahar; Lippens, Pierre-Emmanuel; Amarilla, José Manuel

2014-01-01

Thermal and structural stabilities of the delithiated positive electrode material Li x Co 2/3 Ni 1/6 Mn 1/6 O 2 were studied by X-ray diffraction, magnetic and thermogravimetric analysis. In the opposite to the classical electrode materials LiNiO 2 and LiCoO 2 , the structural symmetry (S.G. R-3 m) of the starting material LiCo 2/3 Ni 1/6 Mn 1/6 O 2 is preserved during the electrochemical cycling with a small variation of the unit cell parameters. Squid measurements evidenced that practically no Ni 2+ ions were present in the lithium slab even after the lithium extraction process. For the thermal stability, the highly oxidized phase Li 0.3 Co 2/3 Ni 1/6 Mn 1/6 O 2 was tested. This delithiated phase undergoes only 5.16% weight loss after heating up to 600 °C. This weight loss has no effect on the structure symmetry as the starting α-NaFeO 2 type structure was preserved during the thermal treatment. The obtained results coupled to the excellent electrochemical features of LiCo 2/3 Ni 1/6 Mn 1/6 O 2 clearly showits ability to compete with the commercialized cathode materials

Study of epitaxial lateral overgrowth of semipolar (1 1 − 2 2) GaN by using different SiO2 pattern sizes

International Nuclear Information System (INIS)

Song, Ki-Ryong; Lee, Jae-Hwan; Han, Sang-Hyun; Yi, Hye-Rin; Lee, Sung-Nam

2013-01-01

Graphical abstract: - Highlights: • We examine comparative studies of semipolar ELO-GaN film. • Semipolar ELO-GaN film was grown by three step growth method. • The achievement of smooth surface morphology of semipolar ELO-GaN. • The crystal and optical properties was significantly improved by ELO process. - Abstract: We investigated the growth mode and the crystal properties of lateral epitaxial overgrowth (LEO) semipolar (1 1 − 2 2) GaN by using the various SiO 2 pattern sizes of 6, 8, 10 and 12 μm with the window width of 4.0 μm. By using three-step growth technique, we successfully obtained the fully-coalescenced semipolar (1 1 − 2 2) LEO-GaN films regardless of the SiO 2 pattern sizes. However, the coalescence thickness of LEO-GaN film was decreased with decreasing SiO 2 pattern size, indicating that the coalescence of semipolar (1 1 − 2 2) GaN was easily formed by decreasing the pattern size of SiO 2 mask. The full width at half maximums (FWHMs) of X-ray rocking curves (XRCs) of LEO-GaN films decreased with increasing SiO 2 pattern size. In the pattern size of 4 × 10 μm, we achieved the minimum XRCs FWHM of 537 and 368 arc s with two different X-ray incident beam directions of [1 1 − 2 − 3] and [1 − 1 0 0], respectively. Moreover, the photoluminescence bandedge emission of semipolar (1 1 − 2 2) GaN was 45 times increased by LEO process. Based on these results, we concluded that the LEO pattern size of 4 × 10 μm would effectively decrease crystal defects of semipolar (1 1 − 2 2) GaN epilayer, resulting in an improvement of the optical properties

The high affinity selectin glycan ligand C2-O-sLex and mRNA transcripts of the core 2 β-1,6-N-acetylglusaminyltransferase (C2GnT1) gene are highly expressed in human colorectal adenocarcinomas

International Nuclear Information System (INIS)

St Hill, Catherine A; Farooqui, Mariya; Mitcheltree, Gregory; Gulbahce, H Evin; Jessurun, Jose; Cao, Qing; Walcheck, Bruce

2009-01-01

The metastasis of cancer cells and leukocyte extravasation into inflamed tissues share common features. Specialized carbohydrates modified with sialyl Lewis x (sLe x ) antigens on leukocyte membranes are ligands for selectin adhesion molecules on activated vascular endothelial cells at inflammatory sites. The activity of the enzyme core 2 β1,6 N-acetylglucosaminyltransferase (C2GnT1) in leukocytes greatly increases their ability to bind to endothelial selectins. C2GnT1 is essential for the synthesis of core 2-branched O-linked carbohydrates terminated with sLe x (C2-O-sLe x ). Our goal was to determine the expression profiles of C2-O-sLe x in the malignant progression and metastasis of colorectal adenocarcinomas. The well characterized CHO-131 monoclonal antibody (mAb) specifically recognizes C2-O-sLe x present in human leukocytes and carcinoma cells. Using CHO-131 mAb, we investigated whether C2-O-sLe x was present in 113 human primary colorectal adenocarcinomas, 10 colorectal adenomas, 46 metastatic liver tumors, 28 normal colorectal tissues, and 5 normal liver tissues by immunohistochemistry. We also examined mRNA levels of the enzyme core 2 β1,6-N-acetylglucosaminyltransferase (C2GnT1) in 20 well, 15 moderately, and 2 poorly differentiated colorectal adenocarcinomas, and in 5 normal colorectal tissues by using quantitative real-time polymerase chain reactions (RT-PCR). We observed high reactivity with CHO-131 mAb in approximately 70% of colorectal carcinomas and 87% of metastatic liver tumors but a lack of reactivity in colorectal adenomas and normal colonic and liver tissues. Positive reactivity with CHO-131 mAb was very prominent in neoplastic colorectal glands of well to moderately differentiated adenocarcinomas. The most intense staining with CHO-131 mAb was observed at the advancing edge of tumors with the deepest invasive components. Finally, we analyzed C2GnT1 mRNA levels in 37 colorectal adenocarcinomas and 5 normal colorectal tissues by RT

(2,4-Dioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylato-κ2O4,O5(4-oxido-2-oxo-1,2-dihydropyrimidine-5-carboxylato-κ2O4,O5bis(1,10-phenanthroline-κ2N,N′yttrium(III dihydrate

Directory of Open Access Journals (Sweden)

Zilu Chen

2008-09-01

Full Text Available In the title compound, [Y(C5H2N2O4(C5H3N2O4(C12H8N22]·2H2O, the YIII ion lies on a twofold rotation axis and exhibits a distorted square-antiprismatic coordination geometry. It is chelated by two 1,10-phenanthroline ligands, a 2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate monoanion and a 4-oxido-2-oxo-1,2-dihydropyrimidine-5-carboxylate dianion. The H atom involved in an N—H...N hydrogen bond between the 1,2-dihydropyrimidine units has half occupancy and is disordered around a twofold rotation axis.

Downregulation of sphingosine 1-phosphate (S1P) receptor 1 by dexamethasone inhibits S1P-induced mesangial cell migration.

Science.gov (United States)

Koch, Alexander; Jäger, Manuel; Völzke, Anja; Grammatikos, Georgios; Zu Heringdorf, Dagmar Meyer; Huwiler, Andrea; Pfeilschifter, Josef

2015-06-01

Sphingosine 1-phosphate (S1P) is generated by sphingosine kinase (SK)-1 and -2 and acts mainly as an extracellular ligand at five specific receptors, denoted S1P1-5. After activation, S1P receptors regulate important processes in the progression of renal diseases, such as mesangial cell migration and survival. Previously, we showed that dexamethasone enhances SK-1 activity and S1P formation, which protected mesangial cells from stress-induced apoptosis. Here we demonstrate that dexamethasone treatment lowered S1P1 mRNA and protein expression levels in rat mesangial cells. This effect was abolished in the presence of the glucocorticoid receptor antagonist RU-486. In addition, in vivo studies showed that dexamethasone downregulated S1P1 expression in glomeruli isolated from mice treated with dexamethasone (10 mg/kg body weight). Functionally, we identified S1P1 as a key player mediating S1P-induced mesangial cell migration. We show that dexamethasone treatment significantly lowered S1P-induced migration of mesangial cells, which was again reversed in the presence of RU-486. In summary, we suggest that dexamethasone inhibits S1P-induced mesangial cell migration via downregulation of S1P1. Overall, these results demonstrate that dexamethasone has functional important effects on sphingolipid metabolism and action in renal mesangial cells.

Reactions of small negative ions with O2(a 1[Delta]g) and O2(X 3[Sigma]g-)

Science.gov (United States)

Midey, Anthony; Dotan, Itzhak; Seeley, J. V.; Viggiano, A. A.

2009-02-01

The rate constants and product ion branching ratios were measured for the reactions of various small negative ions with O2(X 3[Sigma]g-) and O2(a 1[Delta]g) in a selected ion flow tube (SIFT). Only NH2- and CH3O- were found to react with O2(X) and both reactions were slow. CH3O- reacted by hydride transfer, both with and without electron detachment. NH2- formed both OH-, as observed previously, and O2-, the latter via endothermic charge transfer. A temperature study revealed a negative temperature dependence for the former channel and Arrhenius behavior for the endothermic channel, resulting in an overall rate constant with a minimum at 500 K. SF6-, SF4-, SO3- and CO3- were found to react with O2(a 1[Delta]g) with rate constants less than 10-11 cm3 s-1. NH2- reacted rapidly with O2(a 1[Delta]g) by charge transfer. The reactions of HO2- and SO2- proceeded moderately with competition between Penning detachment and charge transfer. SO2- produced a SO4- cluster product in 2% of reactions and HO2- produced O3- in 13% of the reactions. CH3O- proceeded essentially at the collision rate by hydride transfer, again both with and without electron detachment. These results show that charge transfer to O2(a 1[Delta]g) occurs readily if the there are no restrictions on the ion beyond the reaction thermodynamics. The SO2- and HO2- reactions with O2(a) are the only known reactions involving Penning detachment besides the reaction with O2- studied previously [R.S. Berry, Phys. Chem. Chem. Phys., 7 (2005) 289-290].

Bis{μ-2,2′-[1,1′-(ethane-1,2-diyldinitrilodiethylidyne]diphenolato-κ5O,N,N′,O′:O}bis[chloridomanganese(III

Directory of Open Access Journals (Sweden)

Robert D. Pike

2008-02-01

Full Text Available The title compound, [Mn2(C18H18N2O22Cl2], was synthesized by the reaction between manganese(II o-chlorobenzoate and the Schiff base generated in situ by the condensation of ethane-1,2-diamine and o-hydroxyacetophenone. The centrosymmetric dimer contains two Jahn–Teller-distorted manganese(III ions, each in an octahedral geometry, connected through two phenoxy bridges from two ligands.

Proline adsorption on TiO 2(1 1 0) single crystal surface: A study by high resolution photoelectron spectroscopy

Science.gov (United States)

Fleming, G. J.; Adib, K.; Rodriguez, J. A.; Barteau, M. A.; Idriss, H.

2007-12-01

The surface chemistry and binding of DL-proline were investigated on the oxidised (stoichiometric) and reduced (sub-stoichiometric) TiO 2(1 1 0) single crystal surfaces. TiO 2 was chosen as the substrate as it best represents the surface of a biomedical implant, which bio-molecules interact with during the healing of bone/teeth fractures (molecular recognition). High resolution X-ray photoelectron spectroscopy (HR-XPS) studies of the C1s and N1s regions revealed that DL-proline is present in two forms (dissociated and zwitterionic) on the oxidised TiO 2 surface. On TiO 2(1 1 0) surfaces reduced by Ar + sputtering, a significant increase in the amount of zwitterionic proline at the surface was detected when compared with the oxidised surface. Study of the temperature effect showed that in both cases the zwitterionic structure was the less stable structure. The reason for its relative instability appears to be thermodynamic.

Li_2ZrO_3-coated Li_4Ti_5O_1_2 with nanoscale interface for high performance lithium-ion batteries

International Nuclear Information System (INIS)

Zhang, Han; Liu, Yang; Wang, Ting; Yang, Yang; Shi, Shaojun; Yang, Gang

2016-01-01

Graphical abstract: - Highlights: • Zr doped and Li_2ZrO_3 coated Li_4Ti_5O_1_2 are prepared by a solid-state method. • Zr-doping and LZO coating are positive in improving lithium diffusion ability. • Li_2ZrO_3 coated Li_4Ti_5O_1_2 deliver 168.1 mAh g"−"1 higher than 150.2 mAh g"−"1 of Li_4Ti_5O_1_2. • Li_2ZrO_3 coated Li_4Ti_5O_1_2 remains 162 mAh g"−"1 after 100 cycles. • The lowest D_L_i"+ is 5.97 × 10"−"1"7 and 1.85 × 10"−"1"5 cm"2 s"−"1 of Li_4Ti_5O_1_2 before and after coating. - Abstract: Zr doped sample of Li_4Ti_4_._9_9Zr_0_._0_1O_1_2 (LZTO) and Li_2ZrO_3 (LZO) coated Li_4Ti_5O_1_2 (LTO) are prepared by a solid-state method. The lattice structure of LTO is remained after doping element of Zr and coating layer of LZO. The crystal structure and electrochemical performance of the material are investigated by X-ray diffractometry (XRD), high-resolution transmission electron microscopy (HRTEM), cyclic voltammetry (CV), galvanostatic intermittent titration technique (GITT) and charge-discharge tests, respectively. Zr-doping and LZO coating play the positive role in improving the diffusion ability of lithium cations. LZTO and LZO-LTO show much improved specific capacity and rate capability compared with pristine sample of LTO. LZO-LTO has the smallest voltage differential (ΔV) of the redox peaks because the coating of Li_2ZrO_3 is helpful for the diffusion ability of lithium ions during charge/discharge processes. LZTO and LZO-LTO as electrode deliver the initial capacities of 164.8, 168.1 mAh g"−"1, respectively, which are much higher than 150.2 mAh g"−"1 of intrinsic sample of LTO. Even at the current density of 2 A g"−"1, LTZO and LZO-LTO offer capacity of 96 and 106 mAh g"−"1, which are much higher than 33 mAh g"−"1 of LTO. The improved electrochemical performance is attributed to the improved diffusion ability of lithium. During the whole discharge process, the lowest value of LTO is 5.97 × 10"−"1"7 cm"2 s"−"1 that is

Milestone Report - Demonstrate Braided Material with 3.5 g U/kg Sorption Capacity under Seawater Testing Condition (Milestone M2FT-15OR0310041 - 1/30/2015)

Energy Technology Data Exchange (ETDEWEB)

Janke, Christopher James [ORNL; Das, Sadananda [ORNL; Oyola, Yatsandra [ORNL; Mayes, Richard T [ORNL; Gill, Gary [Pacific Northwest National Laboratory (PNNL); Kuo, Li-Jung [Pacific Northwest National Laboratory (PNNL); Wood, Jordana [Pacific Northwest National Laboratory (PNNL)

2015-01-01

This report describes work on the successful completion of Milestone M2FT-15OR0310041 (1/30/2015) entitled, Demonstrate braided material with 3.5 g U/kg sorption capacity under seawater testing condition . This effort is part of the Seawater Uranium Recovery Program, sponsored by the U.S. Department of Energy, Office of Nuclear Energy, and involved the development of new adsorbent braided materials at the Oak Ridge National Laboratory (ORNL) and marine testing at the Pacific Northwest National Laboratory (PNNL). ORNL has recently developed four braided fiber adsorbents that have demonstrated uranium adsorption capacities greater than 3.5 g U/kg adsorbent after marine testing at PNNL. The braided adsorbents were synthesized by braiding or leno weaving high surface area polyethylene fibers and conducting radiation-induced graft polymerization of itaconic acid and acrylonitrile monomers onto the braided materials followed by amidoximation and base conditioning. The four braided adsorbents demonstrated capacity values ranging from 3.7 to 4.2 g U/kg adsorbent after 56 days of exposure in natural coastal seawater at 20 oC. All data are normalized to a salinity of 35 psu.

Sugammadex 4.0 mg kg-1 reversal of deep rocuronium-induced neuromuscular blockade

DEFF Research Database (Denmark)

Yu, Buwei; Wang, Xiangrui; Hansen, Søren Helbo

2014-01-01

Objective: Maintenance of deep Neuro Muscular Blockade (NMB) until the end of surgery may be beneficial in some surgical procedures. The selective relaxant binding agent sugammadex rapidly reverses deep levels of rocuronium-induced NMB. The purpose of this study was to evaluate the efficacy...... and safety of sugammadex 4.0 mg kg-1 for reversal of deep rocuronium-induced NMB in Chinese and Caucasian patients. Methods: This was an open-label, multicenter, prospective Phase III efficacy study in adult American Society of Anesthesiologists Class 1-3 patients scheduled for surgery under general...... anesthesia and requiring deep NMB. All patients received intravenous propofol and opioids for induction and maintenance of anesthesia, and a single intubation dose of rocuronium 0.6 mg/kg, with maintenance doses of 0.1-0.2 mg/kg as required. Sugammadex 4.0 mg/kg was administered after the last dose...

Aquachlorido{6,6′-dimethoxy-2,2′-[ethane-1,2-diylbis(nitrilodimethylidyne]diphenolato-κ2O1,N,N′,O1′}cobalt(III monohydrate

Directory of Open Access Journals (Sweden)

Jianxin Xing

2009-04-01

Full Text Available The title compound, [Co(C18H18N2O4Cl(H2O]·H2O, contains a distorted octahedral cobalt(III complex with a 6,6′-dimethoxy-2,2′-[ethane-1,2-diylbis(nitrilodimethylidyne]diphenolate ligand, a chloride and an aqua ligand, and also a disordered water solvent molecule (half-occupancy. The CoIII ion is coordinated in an N2O3Cl manner. Weak O—H...O hydrogen bonds may help to stabilize the crystal packing.

Searches for H2O masers toward narrow-line Seyfert 1 galaxies

Science.gov (United States)

Yoshiaki, Hagiwara; Doi, Akihiro; Hachisuka, Kazuya; Horiuchi, Shinji

2018-05-01

We present searches for 22 GHz H2O masers toward 36 narrow-line Seyfert 1 galaxies (NLS1s), selected from known NLS1s with vsys ≲ 41000 km s-1. Out of the 36 NLS1s in our sample, 11 have been first surveyed in our observations, while the observations of other NLS1s were previously reported in literature. In our survey, no new water maser source from NLS1s was detected at the 3σ rms level of 8.4 mJy to 144 mJy, which depends on different observing conditions or inhomogeneous sensitivities of each observation using three different telescopes. It is likely that the non-detection of new masers in our NLS1 sample is primarily due to insufficient sensitivities of our observations. Including the five known NLS1 masers, the total detection rate of the H2O maser in NLS1s is not remarkably different from that of type 2 Seyfert galaxies or LINERs. However, more extensive and systematic searches of NLS1 would be required for a statistical discussion of the detection rate of the NLS1 maser, compared with that of type 2 Seyferts or LINERs.

A new rechargeable lithium-ion battery with a xLi2MnO3.(1 - x) LiMn0.4Ni0.4Co0.2O2 cathode and a hard carbon anode

International Nuclear Information System (INIS)

Liu Jinlong; Wang Jie; Xia Yongyao

2011-01-01

Highlights: → A new type of battery with 0.4Li 2 MnO 3 0.6LiMn 0.4 Ni 0.4 Co 0.2 O 2 and hard carbon was proposed. → The irreversible capacity encountered at both electrodes, can be counterbalanced each other. → The battery delivers capacities of 105 mAh g -1 and specific energies of 315 Wh kg -1 . - Abstract: We reported a new type of rechargeable lithium-ion battery consisting of a structurally integrated 0.4Li 2 MnO 3 .0.6LiMnNi 0.4 Co 0.2 O 2 cathode and a hard carbon anode. The drawback of the high irreversible capacity loss of both electrodes, occurring at the first charge/discharge process, can be counterbalanced each other. The battery shows good reversibility with a sloping voltage from 1.5 V to 4.5 V and delivers a capacity of 105 mA h g -1 and a specific energy of 315 W h kg -1 based on the total weight of the both active electrode materials.

Electron impact excitation-autoionisation of the (2s2)1S, (2p2)1D and (2s2p)1P autoionising states of helium

International Nuclear Information System (INIS)

Samardzic, O.; Hurn, J.A.; Weigold, E.; Brunger, M.J.

1994-01-01

The electron impact excitation of the (2s 2 ) 1 S, (2p 2 ) 1 D and (2s2p) 1 P autoionising states of helium and their subsequent radiationless decay was studied by observation of the ejected electrons. The present work was carried out at an incident energy of 94.6 eV and for ejected electron scattering angles in the range 25-135 deg C. The lineshapes observed in the present ejected electron spectra are analysed using the Shore-Balashov parametrisation. As part of the analysis procedure, numerically rigorous confidence limits were determined for the derived parameters. No previous experimental or theoretical work has been undertaken at the incident energy of the present investigation but, where possible, the resulting parameters are qualitatively compared against the 80 eV results of other experiments and theory. 37 refs., 4 figs

Lithium Superionic Conductor Li{sub 9.42}Si{sub 1.02}P{sub 2.1}S{sub 9.96}O{sub 2.04} with Li{sub 10}GeP{sub 2}S{sub 12}-Type Structure in the Li{sub 2}S–P{sub 2}S{sub 5}–SiO{sub 2} Pseudoternary System: Synthesis, Electrochemical Properties, and Structure–Composition Relationships

Energy Technology Data Exchange (ETDEWEB)

Hori, Satoshi [Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama (Japan); Suzuki, Kota; Hirayama, Masaaki [Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama (Japan); Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Yokohama (Japan); Kato, Yuki [Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama (Japan); Battery Research Division, Higashifuji Technical Center, Toyota Motor Corporation, Susono, Shizuoka (Japan); Battery AT, Advanced Technology 1, Toyota Motor Europe NV/SA, Zaventem (Belgium); Kanno, Ryoji, E-mail: kanno@echem.titech.ac.jp [Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama (Japan); Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Yokohama (Japan)

2016-12-07

Lithium superionic conductors with the Li{sub 10}GeP{sub 2}S{sub 12} (LGPS)-type structure are promising materials for use as solid electrolytes in the next-generation lithium batteries. A novel member of the LGPS family, Li{sub 9.42}Si{sub 1.02}P{sub 2.1}S{sub 9.96}O{sub 2.04} (LSiPSO), and its solid solutions were synthesized by quenching from 1273 K in the Li{sub 2}S–P{sub 2}S{sub 5}–SiO{sub 2} pseudoternary system. The material exhibited an ionic conductivity as high as 3.2 × 10{sup −4} S cm{sup −1} at 298 K, as well as the high electrochemical stability to lithium metal, which was improved by the introduction of oxygen into the LGPS-type structure. An all-solid-state cell with a lithium metal anode and LSiPSO as the separator showed excellent performance with a high reversibility of 100%. Thus, oxygen doping is an effective way of improving the electrochemical stability of LGPS-type structure.

Study of some properties of 's' neutron resonance parameters for target nuclei I = 1/2 and I = 3/2 in function of spin value J = I + 1/2 in the energy range 1 {yields} 5000 eV; Etude de quelques proprietes des parametres de resonances des neutrons ''s'' pour des noyaux cibles I = 1/2 et I = 3/2 en fonction de la valeur du spin J = I + 1/2 dans le domaine d'energie 1 eV {yields} 5000 eV

Energy Technology Data Exchange (ETDEWEB)

Julien, J [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

1967-05-15

Different kinds of experiments and analysis methods allowing to achieve neutron resonances parameters in the low energy range (1 eV {yields} 5000 eV) are described. A great deal of effort to improve experimental conditions and data processing in order to know the spin value J = I {+-} 1/2 has been spent. The time of flight method was used. A few target nuclei I = 3/2 and 1 = 1/2 have been studied. For I = 3/2 (Ga, As, 3r, Au) we find S{sub o} J = 2 {approx_equal} 2 S{sub o} J = 1 and S{sub o} J = 1 {approx_equal} S{sub o} J = 0 for I = 1/2 (Tm, Pt) but {sup 77}Se. Fluctuations of the total radiative width {gamma}{sub {gamma}} depend on the spin value I = I {+-} 1/2 when E1 transition, are enhanced for one of the both spin states. The magnitude of these fluctuations can be explained of the strength of E1 transitions (E{sub {gamma}} {approx} 7 MeV) is supposed to be proportional to E{sup 5}{sub {gamma}} instead of E{sup 3}{sub {gamma}}. The distribution of levels spacings against spin value J are considered and are compared to theoretical predictions. (author) [French] On decrit les differentes methodes d'analyse permettant d'obtenir les parametres des resonances de neutron dans le domaine d'energie 1 eV {yields} 5000 eV. Un effort particulier a ete fait pour connaitre la valeur du spin J = I {+-} 1/2. Les types d'experience et les analyses des donnees, developpes et ameliores pour determiner J sont decrits. Les resultats obtenus ont permis l'etude de differentes proprietes en fonction du spin J. On trouve: S{sub o} J 2 {approx_equal} 2 S{sub o} J = 1 pour les noyaux I = 3/2 etudies (Ga, As, Br, Au) et S{sub o} J = 1 {approx_equal} S{sub o} J = 0 Pour le Tm et {sup 195}Pt de spin I = 1/2. On constate que les largeurs radiatives totales {gamma}{sub {gamma}} fluctuent si des transitions E1 aux premiers etats excites sont favorisees. Ces fluctuations peuvent etre expliquees si on suppose que les intensites de ces transitions sont proportionnelles a E{sup 5}{sub {gamma

Toxicological evaluation of a novel umami flavour compound: 2-(((3-(2,3-Dimethoxyphenyl-1H-1,2,4-triazol-5-ylthiomethylpyridine

Directory of Open Access Journals (Sweden)

Donald S. Karanewsky

Full Text Available A toxicological evaluation of a umami flavour compound, 2-(((3-(2,3-dimethoxyphenyl-1H-1,2,4-triazol-5-ylthiomethylpyridine (S3643; CAS 902136-79-2, was completed for the purpose of assessing its safety for use in food and beverage applications. S3643 undergoes extensive oxidative metabolism in vitro with rat microsomes producing the S3643-sulfoxide and 4′-hydroxy-S3643 as the major metabolites. In incubations with human microsomes, the O-demethyl-S3643 and S3643-sulfoxide were produced as the major metabolites. In pharmacokinetic studies in rats, the S3643-sulfoxide represents the dominant biotransformation product. S3643 was not found to be mutagenic or clastogenic in vitro, and did not induce micronuclei in CHO-WBL cells. In subchronic oral toxicity studies in rats, the no-observed-adverse-effect-level (NOAEL for S3643 was 100 mg/kg bw/day (highest dose tested when administered in the diet for 90 consecutive days. Keywords: Umami flavour, S3643, FEMA GRAS, Subchronic toxicological evaluation, Genetic toxicological evaluation

Electrically detected magnetic resonance study of the Ge dangling bonds at the Ge(1 1 1)/GeO2 interface after capping with Al2O3 layer

International Nuclear Information System (INIS)

Paleari, S.; Molle, A.; Accetta, F.; Lamperti, A.; Cianci, E.; Fanciulli, M.

2014-01-01

The electrical activity of Ge dangling bonds is investigated at the interface between GeO 2 -passivated Ge(1 1 1) substrate and Al 2 O 3 grown by atomic layer deposition, by means of electrically detected magnetic resonance spectroscopy (EDMR). The Al 2 O 3 /GeO 2 /Ge stacked structure is promising as a mobility booster for the post-Si future electronic devices. EDMR proved to be useful in characterizing interface defects, even at the very low concentrations of state-of-the-art devices ( 10 cm −2 ). In particular, it is shown that capping the GeO 2 -passivated Ge(1 1 1) with Al 2 O 3 has no impact on the microstructure of the Ge dangling bond.

Electrical Resistance of Ag-TS-S(CH2)(n-1)CH3//Ga2O3/EGaln Tunneling Junctions

NARCIS (Netherlands)

Cademartiri, Ludovico; Thuo, Martin M.; Nijhuis, Christian A.; Reus, William F.; Tricard, Simon; Barber, Jabulani R.; Sodhi, Rana N. S.; Brodersen, Peter; Kim, Choongik; Chiechi, Ryan C.; Whitesides, George M.

2012-01-01

Tunneling junctions having the structure Ag-TS-S(CH2)(n-1)CH3//Ga2O3/EGaIn allow physical-organic studies of charge transport across self-assembled monolayers (SAMs). In ambient conditions, the surface of the liquid metal electrode (EGaIn, 75.5 wt % Ga, 24.5 wt % In, mp 15.7 degrees C) oxidizes and

Electron Excitation Rate Coefficients for Transitions from the IS21S Ground State to the 1S2S1,3S and 1S2P1,3P0 Excited States of Helium

Science.gov (United States)

Aggarwal, K. M.; Kingston, A. E.; McDowell, M. R. C.

1984-03-01

The available experimental and theoretical electron impact excitation cross section data for the transitions from the 1s2 1S ground state to the 1s2s 1,3S and 1s2p 1,3P0 excited states of helium are assessed. Based on this assessed data, excitation rate coefficients are calculated over a wide electron temperature range below 3.0×106K. A comparison with other published results suggests that the rates used should be lower by a factor of 2 or more.

Experimental investigation of 150-KG-scale corium melt jet quenching in water

Energy Technology Data Exchange (ETDEWEB)

Magallon, D.; Hohmann, H.

1995-09-01

This paper compares and discusses the results of two large scale FARO quenching tests known as L-11 and L-14, which involved, respectively, 151 kg of W% 76.7 UO{sub 2} + 19.2 ZrO{sub 2} + 4.1 Zr and 125 kg of W% 80 UO{sub 2} + 20 ZrO{sub 2} melts poured into 600-kg, 2-m-depth water at saturation at 5.0 MPa. The results are further compared with those of two previous tests performed using a pure oxidic melt, respectively 18 and 44 kg of W% 80 UO{sub 2} + 20 ZrO{sub 2} melt quenched in 1-m-depth water at saturation at 5.0 MPa. In all the tests, significant breakup and quenching took place during the melt fall through the water. No steam explosion occurred. In the tests performed with a pure oxide UO{sub 2}-ZrO{sub 2} melt, part of the corium (from 1/6 to 1/3) did not breakup and reached the bottom plate still molten whatever the water depth was. Test L-11 data suggest that full oxidation and complete breakup of the melt occurred during the melt fall through the water. A proportion of 64% of the total energy content of the melt was released to the water during this phase ({approximately}1.5 s), against 44% for L-14. The maximum temperature increase of the bottom plate was 330 K (L-14). The mean particle size of the debris ranged between 2.5 and 4.8mm.

Crystallization behavior of (1 - x)Li2O.xNa2O.Al2O3.4SiO2 glasses

International Nuclear Information System (INIS)

Wang, Moo-Chin; Cheng, Chih-Wei; Chang, Kuo-Ming; Hsi, Chi-Shiung

2010-01-01

The crystallization behavior of the (1 - x)Li 2 O.xNa 2 O.Al 2 O 3 .4SiO 2 glasses has been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron diffraction (ED) and energy dispersive spectroscopy (EDS). The crystalline phase was composed of β-spodumene. The isothermal crystallization kinetics of β-spodumene from the (1 - x)Li 2 O.xNa 2 O.Al 2 O 3 .4SiO 2 glasses has also been studied by a quantitative X-ray diffraction method. The activation energy of β-spodumene formation decreases from 359.2 to 317.8 kJ/mol when the Na 2 O content increases from 0 to 0.4 mol and it increases from 317.8 to 376.9 kJ/mol when the Na 2 O content increases from 0.4 to 0.6 mol. The surface nucleation and plate-like growth were dominant in the crystallization of the (1 - x)Li 2 O.xNa 2 O.Al 2 O 3 .4SiO 2 glasses.

Crystal structures of three 1-oxo-1,2-dihydronaphthalene derivatives: dimethyl 4-(4-methoxyphenyl-2-(4-methylphenyl-1-oxo-1,2-dihydronaphthalene-2,3-dicarboxylate, dimethyl 1-oxo-2-(pyren-4-yl-4-(thiophen-2-yl-1,2-dihydronaphthalene-2,3-dicarboxylate and ethyl 1-oxo-2-phenyl-2,4-bis(thiophen-2-yl-1,2-dihydronaphthalene-3-carboxylate

Directory of Open Access Journals (Sweden)

S. Gopinath

2017-02-01

Full Text Available In the title 1-oxo-1,2-dihydronaphthalene derivatives, C28H24O6, (I, C34H22O5S, (II, and C27H20O3S2, (III, the cyclohexa-1,3-diene rings of the 1,2-dihydronaphthalene ring systems adopt half-chair, boat and half-chair conformations, respectively. The carbonyl O atoms attached to the dihydronaphthalene ring systems are each significantly deviated from the mean plane of the 1,2-dihydronaphthalene ring system, by 0.6162 (12 Å in (I, 0.6016 (16 Å in (II and 0.515 (3 Å in (III. The mean planes of the 1,2-dihydronaphthalene ring systems make dihedral angles of 85.83 (3, 88.19 (3 and 81.67 (8°, respectively, with the methylphenyl ring in (I, the pyrene ring in (II and the phenyl ring in (III. In (I, the molecular structure is stabilized by an intramolecular C—H...O hydrogen bond, generating an S(6 ring motif. In the crystal of (I, molecules are linked by an intermolecular C—H...O hydrogen bond, which generates a C(8 zigzag chain running along [100]. Adjacent chains are further connected by C—H...π and offset π–π interactions [centroid–centroid distance = 3.6572 (9 Å], forming a double-chain structure. In the crystals of (II and (III, molecules are linked into chain structures by offset π–π interactions with centroid–centroid distances of 3.5349 (12 and 3.8845 (13 Å for (II and 3.588 (2 Å for (III. In (II and (III, the thiophene rings are orientationally disordered over two sites, with occupancy ratios of 0.69:0.31 for (II, and 0.528 (4:0.472 (4 and 0.632 (5:0.368 (5 for (III.

Avaliação da remoção de debris após irrigação com EDTA 17% e EGTA 1% associados ao hipoclorito de sódio 1%: análise histológica = Evaluation of debris removal by 17% EDTA and 1% EGTA associated with 1,0% sodium hypochlorite: histological analysis

Directory of Open Access Journals (Sweden)

Souza, Rogério Emílio

2005-01-01

Full Text Available Avaliou-se a capacidade de limpeza das paredes de canais radiculares de duas diferentes soluções quelantes (EDTA 17% e EGTA 1% no terço apical. Utilizaram-se 20 dentes incisivos centrais inferiores humanos, divididos em 2 grupos, em função da solução irrigante utilizada no preparo biomecânico da seguinte forma: GRUPO I – EDTA 17%, GRUPO II – EGTA 1%. As duas soluções foram associadas ao hipoclorito de sódio 1% na proporção 1:1. A instrumentação dos canais radiculares foi realizada por meio da técnica escalonada programada, e os mesmos eram irrigados com 4 ml de solução a cada troca de instrumento, sendo 2 ml da solução quelante e 2 ml de hipoclorito de sódio. No preparo dos espécimes para exame microscópico selecionaram- se 15 cortes do terço apical. Para a análise morfométrica, empregou-se um estereomicroscópio com aumento de 10× e uma grade de integração de 100 pontos. A análise estatística dos resultados mostrou haver diferenças estatísticas (p < 0,05 entre as soluções estudadas com vantagem para o EDTA. A adição das soluções quelantes à solução de hipoclorito de sódio 1% na proporção 1:1 não produzem paredes dentinárias de canais isentas de detritos no terço apical

Dissociative adsorption of CCl 4 on the Fe 3O 4(1 1 1)-(2×2) selvedge of α-Fe 2O 3(0 0 0 1)

Science.gov (United States)

Adib, K.; Mullins, D. R.; Totir, G.; Camillone, N.; Fitts, J. P.; Rim, K. T.; Flynn, G. W.; Osgood, R. M.

2003-02-01

The surface reactions of CCl 4 with the Fe 3O 4(1 1 1)-(2×2) selvedge of naturally occurring α-Fe 2O 3(0 0 0 1) single-crystals have been investigated using synchrotron X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD). CCl 4 was found to dissociate on the Fe 3O 4 surface at 100 K producing chemisorbed Cl and adsorbed CCl 2. TPD shows that the large majority of the dissociatively adsorbed CCl 2 fragments extract lattice oxygen and desorb as phosgene at >275 K. However, the XPS spectra show no evidence for the formation of surface-bound phosgene, at 100 K, indicating that its formation involves two steps. The first step, dissociation, is spontaneous at 100 K, whereas the second, oxygen atom abstraction to form phosgene, requires thermal excitation. Cl chemisorption yielded two separate species, the mono- and dichloride terminations of surface iron sites. The identification of these two surface terminations is based on the coverage dependence and the surface temperature history of their Cl 2p 3/2 peak intensity. For example, heating to >450 K allows the monochloride to transform into iron dichloride, indicating Cl adatom mobility at these temperatures.

Análise de crescimento do capim Coastcross-1 sob adubação nitrogenada em duas idades de rebrotação Growth analysis of Coastcross-1 bermudagrass grown under nitrogen doses at two regrowth ages

Directory of Open Access Journals (Sweden)

Odilon Gomes Pereira

2011-10-01

Full Text Available Avaliaram-se os índices de crescimento do capim Coastcross-1 sob cinco doses de nitrogênio (0, 100, 200, 300 e 400 kg/ha.ano e duas idades de rebrotação (28 e 42 dias. As doses de nitrogênio foram arranjadas em esquema fatorial 5 × 2, em blocos ao acaso, com três repetições. A adubação nitrogenada foi parcelada em três aplicações, realizadas logo após os cortes. Maiores valores de relação folha/colmo e razão de peso foliar foram obtidos aos 28 dias, em comparação aos 42 dias de rebrotação. Houve redução linear na relação folha/colmo com a adubação nitrogenada (de 1,6 para 1,0 nas doses de 0 e 133 kg/ha.corte de N. Por outro lado, a adubação nitrogenada aumentou linearmente a área foliar específica do capim Coastcross-1 aos 28 dias de rebrotação (de 10,3 a 20,8 m²/kg com o incremento de 0 a 133 kg/ha.corte de N, resultando em elevação da sua razão de área foliar. Na ausência de nitrogênio, a área foliar específica foi maior aos 42 dias (14,3 m²/kg em relação aos 28 dias de rebrotação (8,6 m²/kg. A idade de rebrotação e a adubação nitrogenada modificam o padrão de acúmulo de forragem e as características do pasto de capim Coastcross-1. Durante a estação de maior crescimento, o pasto de capim Coastcross-1 adubado com maior dose de nitrogênio deve ser manejado com menor idade de rebrotação (28 dias.The Coastcross-1 growth index in relation to five nitrogen doses (0, 100, 200, 300 and 400 kg/ha.year and two regrowth ages (28 and 42 days were evaluated. Nitrogen doses were arranged in a 5 × 2 factorial scheme in a randomized complete block design with three repetitions. Nitrogen fertilization was performed in three applications right after the forage harvesting. Higher values for leaf/stem and leaf weight ratio were observed at 28-d regrowth, in comparison with the 42 days of regrowth. Linear reduction of leaf/stem ratio from 1.6 to 1.0 at 0 and 133 kg N/ha.harvest, respectively was

Structural and electrical properties of (1-x)(Na1/2Bi1/2)TiO3-xPb(Mg1/3Nb2/3)O3 solid solution

International Nuclear Information System (INIS)

Lee, J.-K.; Yi, J.Y.; Hong, K.S.

2004-01-01

Structural, dielectric and piezoelectric properties of (1-x)(Na 1/2 Bi 1/2 )TiO 3 -xPb(Mg 1/3 Nb 2/3 )O 3 (NBT-xPMN) solid solution have been investigated. An addition of PMN into NBT transformed the structure of sintered samples from rhombohedral to pseudocubic phase where x is larger than 0.1. In calcined powders, however, the intermediate structure were observed between rhombohedral and cubic phases near x=0.1. The formation of solid solution between NBT and PMN modified the dielectric and piezoelectric properties of NBT to be suitable for high temperature dielectric and piezoelectric material. With increasing the content of PMN, the temperature-stability of ε r (T) increased and the high temperature dielectric loss decreased. In addition, the piezoelectric property of NBT-xPMN was enhanced, for the decrease of coercive field and conductivity promoted the domain reversal under the high electric field of the poling process

New Insights into Mn1−xZnxFe2O4 via Fabricating Magnetic Photocatalyst Material BiVO4/Mn1−xZnxFe2O4

Directory of Open Access Journals (Sweden)

Taiping Xie

2018-02-01

Full Text Available BiVO4/Mn1−xZnxFe2O4 was prepared by the impregnation roasting method. XRD (X-ray Diffractometer tests showed that the prepared BiVO4 is monoclinic crystal, and the introduction of Mn1−xZnxFe2O4 does not change the crystal structure of BiVO4. The introduction of a soft-magnetic material, Mn1−xZnxFe2O4, was beneficial to the composite photocatalyst’s separation from the liquid solution using an extra magnet after use. UV-vis spectra analysis indicated that Mn1−xZnxFe2O4 enhanced the absorption intensity of visible light for BiVO4. EIS (electrochemical impedance spectroscopy investigation revealed that the introduction of Mn1−xZnxFe2O4 enhanced the conductivity of BiVO4, further decreasing its electron transfer impedance. The photocatalytic efficiency of BiVO4/Mn1−xZnxFe2O4 was higher than that of pure BiVO4. In other words, Mn1−xZnxFe2O4 could enhance the photocatalytic reaction rate.

O 1s core levels in Bi2Sr2CaCu2O8+δ single crystals

International Nuclear Information System (INIS)

Parmigiani, F.; Shen, Z.X.; Mitzi, D.B.; Lindau, I.; Spicer, W.E.; Kapitulnik, A.

1991-01-01

High-quality Bi 2 Sr 2 CaCu 2 O 8+δ superconducting single crystals, annealed at different oxygen partial pressures, have been studied using angular-resolved x-ray photoelectron spectroscopy with a resolution higher than that used in any previous study. Two states of the oxygen, separated by ∼0.7 eV, are unambiguously observed. Examining these components at different angles makes it possible to distinguish bulk from surface components. Using this capability we discover that annealing under lower oxygen partial pressure (1 atm) results in oxygen intercalation beneath the Bi-O surface layer of the crystal, whereas for higher-pressure anneals (12 atm) additional oxygen is found on the Bi-O surfaces. This steplike intercalation mechanism is also confirmed by the changes observed in the Cu and Bi core lines as a function of the annealing oxygen partial pressure

2-[1-(Methylsulfanylnaphtho[2,1-b]furan-2-yl]acetic acid

Directory of Open Access Journals (Sweden)

Uk Lee

2008-02-01

Full Text Available The title compound, C15H12O3S, was prepared by alkaline hydrolysis of ethyl 2-{1-(methylsulfanylnaphtho[2,1-b]furan-2-yl}acetate. The crystal structure is stabilized by CH2—H...π interactions between the methyl H atoms of the methylsulfanyl substituent and the central benzene ring of the naphthofuran system, and by inversion-related intermolecular O—H...O hydrogen bonds between the carboxyl groups.

The 1s-2p resonance photoionization measurement of O+ ions in comparison with an isoelectronic species Ne3+

International Nuclear Information System (INIS)

Kawatsura, K.; Yamaoka, H.; Oura, M.; Hayaishi, T.; Sekioka, T.; Agui, A.; Yoshigoe, A.; Koike, F.

2002-01-01

The photoion yields from O + to O 2+ were measured in the 1s-2p autoionizing resonance region of the 525-540 eV photon energy range. A multiconfiguration Dirac-Fock calculation was performed to interpret the experimental data and the results show fairly good agreement with the experimental ones. Photoionization of the N-like isoelectronic sequences of O + and Ne 3+ are discussed. (author)

Crystal structure of 2-(thiophen-2-yl)-1-(5-thioxo-4,5-dihydro-1,3,4-oxadiazol-2-yl) ethenyl]benzamide: N,N-dimethylformamide (1 : 1)

Energy Technology Data Exchange (ETDEWEB)

Sharma, P. [University of Jammu, X-ray Crystallography Laboratory, Department of Physics (India); Subbulakshmi, K. N.; Narayana, B. [Mangalore University, Department of Chemistry (India); Sarojini, B. K. [Mangalore University, Industrial Chemistry Division, Department of Studies in Chemistry (India); Kant, R., E-mail: rkant.ju@gmail.com [University of Jammu, X-ray Crystallography Laboratory, Department of Physics (India)

2016-03-15

The title compound, 2-(thiophen-2-yl)-1-(5-thioxo-4,5-dihydro-1,3,4-oxadiazol-2-yl)ethenyl] benzamide:N,N-dimethylformamide (1: 1), (C{sub 15}H{sub 11}N{sub 3}O{sub 2}S{sub 2} · C{sub 3}H{sub 7}NO), was synthesized, and its structure was established by spectral analysis and X-ray diffraction studies. The compound crystallizes in the monoclinic space group P2{sub 1}/n with a = 10.8714(7), b = 9.0497(5), c = 19.8347(13) Å, β = 91.093(5)°, Z = 4. The crystal structure is stabilized by N–H···S, C–H···O and N–H···O hydrogen bonds. The π···π interactions are also observed between the rings.

1s2p Resonant Inelastic X-ray Scattering Magnetic Circular Dichroism as a probe for the local and non-local orbitals in CrO 2

NARCIS (Netherlands)

Zimmermann, Patric; Bouldi, Nadejda; Hunault, Myrtille O.j.y.; Sikora, Marcin; Ablett, James M.; Rueff, Jean Pascal; Lebert, Blair; Sainctavit, Philippe; De Groot, Frank M.f.; Juhin, Amélie

2018-01-01

We have determined the magnetic ground state of the half-metal CrO2 based on 1s2p Resonant Inelastic X-ray Scattering Magnetic Circular Dichroism (RIXS-MCD) experiments. The two-dimensional RIXS-MCD map displays the 1s X-ray absorption spectrum combined with the 1s2p X-ray emission decay, where

New compounds bearing [M(S_2O_7)_3]"2"- anions (M = Si, Ge, Sn): Syntheses and characterization of A_2[Si(S_2O_7)_3] (A = Na, K, Rb), A_2[Ge(S_2O_7)_3] (A = Li, Na, K, Rb, Cs), A_2[Sn(S_2O_7)_3] (A = Na, K), and the unique germanate Hg_2[Ge(S_2O_7)_3]Cl_2 with cationic "1_∞[HgCl_2_/_2]"+ chains

International Nuclear Information System (INIS)

Logemann, Christian; Witt, Julia; Wickleder, Mathias S.; Gunzelmann, Daniel; Senker, Juergen

2012-01-01

The reaction of the group 14 tetrachlorides MCl_4 (M = Si, Ge, Sn) with oleum (65 % SO_3) at elevated temperatures led to the unique anionic complexes [M(S_2O_7)_3]"2"- that show the central M atoms in coordination of three chelating S_2O_7"2"- groups. The mean distances M-O within the complexes increase from 175 pm (M = Si) via 186 pm (M = Ge) up to 200 pm (M = Sn). The charge balance for the [M(S_2O_7)_3]"2"- anions is achieved by alkaline metal ions A"+ (A = Li, Na, K, Rb, Cs) which were implemented in the syntheses in form of their sulfates. The size of the A"+ ions, i.e. their coordination requirement causes the crystallographic differences in the crystal structures, while the structure of the complex [M(S_2O_7)_3]"2"- anions remains essentially unaffected. Furthermore, we were able to characterize the unique germanate Hg_2[Ge(S_2O_7)_3]Cl_2 which forms when HgCl_2 is added as a source for the counter cation. The Hg"2"+ and the Cl"- ions form infinite cationic chains according to "1_∞[HgCl_2_/_2]"+ which take care for the charge compensation. For selected examples of the compounds the thermal behavior has been monitored by means of thermal analyses and X-ray powder diffraction. For A being an alkaline metal the decomposition product is a mixture of the sulfates A_2SO_4 and the dioxides MO_2, whereas Hg_2[Ge(S_2O_7)_3]Cl_2 shows a more complicated decomposition. The tris-(disulfato)-silicate Na_2[Si(S_2O_7)_3] has additionally been examined by solid state "2"9Si and "2"3Na NMR spectroscopic measurements. (Copyright copyright 2012 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

Ab initio and transition state theory study of the OH + HO2 → H2O + O2(3Σg−)/O2(1Δg) reactions: yield and role of O2(1Δg) in H2O2 decomposition and in combustion of H2

KAUST Repository

Monge Palacios, Manuel

2018-01-22

Reactions of hydroxyl (OH) and hydroperoxyl (HO2) are important for governing the reactivity of combustion systems. We performed post-CCSD(T) ab initio calculations at the W3X-L//CCSD = FC/cc-pVTZ level to explore the triplet ground-state and singlet excited-state potential energy surfaces of the OH + HO2 → H2O + O2(3Σg−)/O2(1Δg) reactions. Using microcanonical and multistructural canonical transition state theories, we calculated the rate constant for the triplet and singlet channels over the temperature range 200–2500 K, represented by k(T) = 3.08 × 1012T0.07 exp(1151/RT) + 8.00 × 1012T0.32 exp(−6896/RT) and k(T) = 2.14 × 106T1.65 exp(−2180/RT) in cm3 mol−1 s−1, respectively. The branching ratios show that the yield of singlet excited oxygen is small (<0.5% below 1000 K). To ascertain the importance of singlet oxygen channel, our new kinetic information was implemented into the kinetic model for hydrogen combustion recently updated by Konnov (Combust. Flame, 2015, 162, 3755–3772). The updated kinetic model was used to perform H2O2 thermal decomposition simulations for comparison against shock tube experiments performed by Hong et al. (Proc. Combust. Inst., 2013, 34, 565–571), and to estimate flame speeds and ignition delay times in H2 mixtures. The simulation predicted a larger amount of O2(1Δg) in H2O2 decomposition than that predicted by Konnov\\'s original model. These differences in the O2(1Δg) yield are due to the use of a higher ab initio level and a more sophisticated methodology to compute the rate constant than those used in previous studies, thereby predicting a significantly larger rate constant. No effect was observed on the rate of the H2O2 decomposition and on the flame speeds and ignition delay times of different H2–oxidizer mixtures. However, if the oxidizer is seeded with O3, small differences appear in the flame speed. Given that O2(1Δg) is much more reactive than O2(3Σg−), we do not preclude an effect of the

Thermodinamically stable phases in the CaO-SiO2-Al2O3-CaSO4-H2O closed system at 25 ºC. Application to cementitious systems

Directory of Open Access Journals (Sweden)

Blanco-Varela, M. T.

2009-06-01

Full Text Available One of the chief causes of cement and concrete deterioration is the loss of durability prompted by sulphate attack. The existing standards call for long test periods (2- 12 months. Thermodynamic modelling is a particularly appropriate technique for studying systems that only reach equilibrium in the long term. Used in the present study to establish the fields of thermodynamic stability for the phases in the CaO-SiO2-Al2O3-CaSO4-H2O system at 25 ºC. According to the model, gypsum is stable at sulphate ion concentrations of 1.23e-2 mol/kg and over, while ettringite exhibits stability at concentrations ranging from 7.64e-6 to 1.54e-2 mol/kg. Ettringite is compatible with all system phases except SH and gypsum only with ettringite, the C-S-H gels, AH3 and SH. None of the calcium aluminates or silicoaluminates in the system is compatible with gypsum: in its presence, they all decompose to cement deteriorating ettringite. Finally, the model revealed that the maximum sulphate concentration at which C-S-H gel is stable is slightly higher in systems with than without Al2O3.Uno de los principales problemas asociados al deterioro de cementos y hormigones es la pérdida de durabilidad por ataque de sulfatos. La normativa existente requiere largos tiempos de ensayo (2-12 meses. La modelización termodinámica es una técnica particularmente adecuada para el estudio de sistemas que alcanzan el equilibrio en tiempos largos. Aplicando esta metodología se han establecido los campos de estabilidad termodinámica de las fases del sistema CaO-SiO2-Al2O3-CaSO4-H2O a 25 ºC. El yeso es estable a partir de la [SO42-] = 1,23e-2 mol/kg, y la ettringita es estable en un rango de [SO42-] = 7,64e-6 -1,54e-2 mol/kg. La ettringita es compatible con todas las fases del sistema excepto con SH y el yeso sólo con la ettringita, los geles C-S-H, el AH3 y el SH. Ninguno de los aluminatos o silicoaluminatos cálcicos son compatibles con el yeso, en su presencia se descomponen

Alteration in the Expression of Cytochrome P450s (CYP1A1, CYP2E1, and CYP3A11 in the Liver of Mouse Induced by Microcystin-LR

Directory of Open Access Journals (Sweden)

Bangjun Zhang

2015-03-01

Full Text Available Microcystins (MCs are cyclic heptapeptide toxins and can accumulate in the liver. Cytochrome P450s (CYPs play an important role in the biotransformation of endogenous substances and xenobiotics in animals. It is unclear if the CYPs are affected by MCs exposure. The objective of this study was to evaluate the effects of microcystin-LR (MCLR on cytochrome P450 isozymes (CYP1A1, CYP2E1, and CYP3A11 at mRNA level, protein content, and enzyme activity in the liver of mice the received daily, intraperitoneally, 2, 4, and 8 µg/kg body weight of MCLR for seven days. The result showed that MCLR significantly decreased ethoxyresorufin-O-deethylase (EROD (CYP1A1 and erythromycin N-demthylase (ERND (CYP3A11 activities and increased aniline hydroxylase (ANH activity (CYP2E1 in the liver of mice during the period of exposure. Our findings suggest that MCLR exposure may disrupt the function of CYPs in liver, which may be partly attributed to the toxicity of MCLR in mice.

Hyperoxia-induced p47phox activation and ROS generation is mediated through S1P transporter Spns2, and S1P/S1P1&2 signaling axis in lung endothelium.

Science.gov (United States)

Harijith, Anantha; Pendyala, Srikanth; Ebenezer, David L; Ha, Alison W; Fu, Panfeng; Wang, Yue-Ting; Ma, Ke; Toth, Peter T; Berdyshev, Evgeny V; Kanteti, Prasad; Natarajan, Viswanathan

2016-08-01

Hyperoxia-induced lung injury adversely affects ICU patients and neonates on ventilator assisted breathing. The underlying culprit appears to be reactive oxygen species (ROS)-induced lung damage. The major contributor of hyperoxia-induced ROS is activation of the multiprotein enzyme complex NADPH oxidase. Sphingosine-1-phosphate (S1P) signaling is known to be involved in hyperoxia-mediated ROS generation; however, the mechanism(s) of S1P-induced NADPH oxidase activation is unclear. Here, we investigated various steps in the S1P signaling pathway mediating ROS production in response to hyperoxia in lung endothelium. Of the two closely related sphingosine kinases (SphKs)1 and 2, which synthesize S1P from sphingosine, only Sphk1(-/-) mice conferred protection against hyperoxia-induced lung injury. S1P is metabolized predominantly by S1P lyase and partial deletion of Sgpl1 (Sgpl1(+/-)) in mice accentuated lung injury. Hyperoxia stimulated S1P accumulation in human lung microvascular endothelial cells (HLMVECs), and downregulation of S1P transporter spinster homolog 2 (Spns2) or S1P receptors S1P1&2, but not S1P3, using specific siRNA attenuated hyperoxia-induced p47(phox) translocation to cell periphery and ROS generation in HLMVECs. These results suggest a role for Spns2 and S1P1&2 in hyperoxia-mediated ROS generation. In addition, p47(phox) (phox:phagocyte oxidase) activation and ROS generation was also reduced by PF543, a specific SphK1 inhibitor in HLMVECs. Our data indicate a novel role for Spns2 and S1P1&2 in the activation of p47(phox) and production of ROS involved in hyperoxia-mediated lung injury in neonatal and adult mice. Copyright © 2016 the American Physiological Society.

Estimativa de geração de energia e emissão evitada de gás de efeito estufa na recuperação de biogás produzido em estação de tratamento de esgotos

Directory of Open Access Journals (Sweden)

Patrícia Bilotta

Full Text Available RESUMO: O aproveitamento do biogás proveniente do tratamento de esgoto doméstico, de dejetos animais e da disposição de resíduos sólidos é uma alternativa de geração de energia elétrica com grande potencial de expansão no Brasil. O objetivo deste trabalho foi quantificar a energia fornecida pelo biogás gerado em uma estação de tratamento de esgotos (ETE e estimar a emissão evitada de gases de efeito estufa (GEEs com a recuperação do biogás. A ETE analisada possui vazão 33.220,8 m3.d-1 e DQO afluente 14.617,1 kg.d-1 e atende a cerca de 190.000 habitantes. Foram utilizados dados de monitoramento de agosto de 2012 a março de 2013 para quantificar os seguintes parâmetros: demanda química de oxigênio (DQO convertida em biomassa; sulfato convertido em sulfeto; DQO convertida em metano; perdas de metano (fase líquida e gasosa; potencial energético disponível; potência elétrica disponível; emissão evitada de metano. Os seguintes resultados foram obtidos: eficiência média de tratamento de 65,6%; produção de metano de 1.427,2 m3.d-1; energia elétrica média disponível de 65.280,3 kWh.mês-1 (59% da demanda média mensal de energia da estação; emissão real evitada de metano de 946,2 kgCH4.d-1 e 17.192,6 kgCO2 eq.d-1 (potencial de aquecimento global - PAG - do CH4=21. Pode-se concluir que a recuperação do biogás na ETE Santa Quitéria resultaria em benefícios econômicos e ambientais.

CO gas sensing properties of In_4Sn_3O_1_2 and TeO_2 composite nanoparticle sensors

International Nuclear Information System (INIS)

Mirzaei, Ali; Park, Sunghoon; Sun, Gun-Joo; Kheel, Hyejoon; Lee, Chongmu

2016-01-01

Highlights: • In4Sn3O12–TeO2 composite nanoparticles were synthesized via a facile hydrothermal route. • The response of the In4Sn3O12–TeO2 composite sensor to CO was stronger than the pristine In4Sn3O12 sensor. • The response of the In4Sn3O12–TeO2 composite sensor to CO was faster than the pristine In4Sn3O12 sensor. • The improved sensing performance of the In4Sn3O12–TeO2 nanocomposite sensor is discussed in detail. • The In4Sn3O12-based nanoparticle sensors showed selectivity to CO over NH3, HCHO and H2. - Abstract: A simple hydrothermal route was used to synthesize In_4Sn_3O_1_2 nanoparticles and In_4Sn_3O_1_2–TeO_2 composite nanoparticles, with In(C_2H_3O_2)_3, SnCl_4, and TeCl_4 as the starting materials. The structure and morphology of the synthesized nanoparticles were examined by X-ray diffraction and scanning electron microscopy (SEM), respectively. The gas-sensing properties of the pure and composite nanoparticles toward CO gas were examined at different concentrations (5–100 ppm) of CO gas at different temperatures (100–300 °C). SEM observation revealed that the composite nanoparticles had a uniform shape and size. The sensor based on the In_4Sn_3O_1_2–TeO_2 composite nanoparticles showed stronger response to CO than its pure In_4Sn_3O_1_2 counterpart. The response of the In_4Sn_3O_1_2–TeO_2 composite-nanoparticle sensor to 100 ppm of CO at 200 °C was 10.21, whereas the maximum response of the In_4Sn_3O_1_2 nanoparticle sensor was 2.78 under the same conditions. Furthermore, the response time of the composite sensor was 19.73 s under these conditions, which is less than one-third of that of the In_4Sn_3O_1_2 sensor. The improved sensing performance of the In_4Sn_3O_1_2–TeO_2 nanocomposite sensor is attributed to the enhanced modulation of the potential barrier height at the In_4Sn_3O_1_2–TeO_2 interface, the stronger oxygen adsorption of p-type TeO_2, and the formation of preferential adsorption sites.

Cyclization of 1,2:3,4-di-O-isopropylidene-α-D-galacto-1,6-hexodialdo-1,5-pyranose acylhydrazone and semicarbazone

OpenAIRE

Martins Alho, Miriam Amelia; Baggio, Ricardo Fortunato; D'accorso, Norma Beatriz

2015-01-01

Cyclization of 1,2:3,4-di-O-isopropylidene-α-D-galacto-1,6-hexodialdo-1,5-pyranose benzoylhydrazone using acetylating mixtures led us to the corresponding (2R)- and (2S)-5- phenyl-1,3,4-oxadiazoline derivatives. The same conditions applied to the semicarbazone produced the 5-methyl-1,3,4-oxadiazoline derivative as the main compound, which is formed with acetylating mixtures even at room temperature. X-Ray analysis and NMR techniques were used to determine the stereochemistry of the new asymme...

The crystal structures of 3-O-benzyl-1,2-O-isopropylidene-5-O-methanesulfonyl-6-O-triphenylmethyl-α-d-glucofuranose and its azide displacement product

Directory of Open Access Journals (Sweden)

Zane Clarke

2018-06-01

Full Text Available The effect of different leaving groups on the substitution versus elimination outcomes with C-5 d-glucose derivatives was investigated. The stereochemical configurations of 3-O-benzyl-1,2-O-isopropylidene-5-O-methanesulfonyl-6-O-triphenylmethyl-α-d-glucofuranose, C36H38O8S (3 [systematic name: 1-[(3aR,5R,6S,6aR-6-benzyloxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxol-5-yl-2-(trityloxyethyl methanesulfonate], a stable intermediate, and 5-azido-3-O-benzyl-5-deoxy-1,2-O-isopropylidene-6-O-triphenylmethyl-β-l-idofuranose, C35H35N3O5 (4 [systematic name: (3aR,5S,6S,6aR-5-[1-azido-2-(trityloxyethyl]-6-benzyloxy-2,2-dimethyltetrahydrofuro[2,3-d][1,3]dioxole], a substitution product, were examined and the inversion of configuration for the azido group on C-5 in 4 was confirmed. The absolute structures of the molecules in the crystals of both compounds were confirmed by resonant scattering. In the crystal of 3, neighbouring molecules are linked by C—H...O hydrogen bonds, forming chains along the b-axis direction. The chains are linked by C—H...π interactions, forming layers parallel to the ab plane. In the crystal of 4, molecules are also linked by C—H...O hydrogen bonds, forming this time helices along the a-axis direction. The helices are linked by a number of C—H...π interactions, forming a supramolecular framework.

High-pressure synthesis and characterization of the effective pseudospin S =1 /2 XY pyrochlores R2P t2O7 (R =Er ,Yb )

Science.gov (United States)

Cai, Y. Q.; Cui, Q.; Li, X.; Dun, Z. L.; Ma, J.; dela Cruz, C.; Jiao, Y. Y.; Liao, J.; Sun, P. J.; Li, Y. Q.; Zhou, J. S.; Goodenough, J. B.; Zhou, H. D.; Cheng, J.-G.

2016-01-01

We report on the high-pressure syntheses and detailed characterizations of two effective pseudospin S =1 /2 XY pyrochlores E r2P t2O7 and Y b2P t2O7 via x-ray/neutron powder diffraction, dc and ac magnetic susceptibility, and specific-heat measurements down to 70 mK. We found that both compounds undergo long-range magnetic transitions at TN ,C≈0.3 K , which are ascribed to an antiferromagnetic- and ferromagnetic-type order for E r2P t2O7 and Y b2P t2O7 , respectively, based on the field dependence of their transition temperatures as well as the systematic comparisons with other similar pyrochlores R2B2O7 (R =Er ,Yb ;B =Sn ,Ti ,Ge ). The observed TN of E r2P t2O7 is much lower than that expected from the relationship of TN versus the ionic radius of B4 + derived from the series of E r2B2O7 , while the TC of Y b2P t2O7 is the highest among the series of ferromagnetic compounds Y b2B2O7 (B =Sn ,Pt ,Ti ). Given the monotonic variation of the lattice constant as a function of the B -cation size across these two series of R2B2O7 (R =Er ,Yb ), the observed anomalous values of TN ,C in the Pt-based XY pyrochlores imply that another important factor beyond the nearest-neighbor R -R distance is playing a role. In light of the anisotropic exchange interactions Jex={Jz z,J±,J±±,Jz ± } for the S =1 /2 XY pyrochlores, we have rationalized these observations by considering a weakened (enhanced) antiferromagnetic planar J± (ferromagnetic Ising-like Jz z) due to strong Pt 5 d -O 2 p hybridization within the plane perpendicular to the local [111] direction.

Sphingosine-1-Phosphate (S1P) Lyase Inhibition Causes Increased Cardiac S1P Levels and Bradycardia in Rats.

Science.gov (United States)

Harris, Christopher M; Mittelstadt, Scott; Banfor, Patricia; Bousquet, Peter; Duignan, David B; Gintant, Gary; Hart, Michelle; Kim, Youngjae; Segreti, Jason

2016-10-01

Inhibition of the sphingosine-1-phosphate (S1P)-catabolizing enzyme S1P lyase (S1PL) elevates the native ligand of S1P receptors and provides an alternative mechanism for immune suppression to synthetic S1P receptor agonists. S1PL inhibition is reported to preferentially elevate S1P in lymphoid organs. Tissue selectivity could potentially differentiate S1PL inhibitors from S1P receptor agonists, the use of which also results in bradycardia, atrioventricular block, and hypertension. But it is unknown if S1PL inhibition would also modulate cardiac S1P levels or cardiovascular function. The S1PL inhibitor 6-[(2R)-4-(4-benzyl-7-chlorophthalazin-1-yl)-2-methylpiperazin-1-yl]pyridine-3-carbonitrile was used to determine the relationship in rats between drug concentration, S1P levels in select tissues, and circulating lymphocytes. Repeated oral doses of the S1PL inhibitor fully depleted circulating lymphocytes after 3 to 4 days of treatment in rats. Full lymphopenia corresponded to increased levels of S1P of 100- to 1000-fold in lymph nodes, 3-fold in blood (but with no change in plasma), and 9-fold in cardiac tissue. Repeated oral dosing of the S1PL inhibitor in telemeterized, conscious rats resulted in significant bradycardia within 48 hours of drug treatment, comparable in magnitude to the bradycardia induced by 3 mg/kg fingolimod. These results suggest that S1PL inhibition modulates cardiac function and does not provide immune suppression with an improved cardiovascular safety profile over fingolimod in rats. Copyright © 2016 by The American Society for Pharmacology and Experimental Therapeutics.

A new recipe for preparing oxidized TiO2(1 1 0) surfaces: An STM study

Science.gov (United States)

Hansen, Jonas Ø.; Matthiesen, Jesper; Lira, Estephania; Lammich, Lutz; Wendt, Stefan

2017-12-01

Using high-resolution scanning tunneling microscopy (STM), we have studied the oxidation of rutile TiO2(1 1 0)-(1 × 1) surfaces with Had species at room temperature. We followed the evolution of various stable species as function of the O2 exposure, and the nature of the ultimately dominating species in the Ti troughs is described. When O2 saturation was accomplished using a glass-capillary array doser, we found that on-top O (Oot) adatoms are the predominant surface species. In contrast, when O2 was supplied via backfilling of the chamber the predominant surface species are tentatively assigned to terminal OH groups. We argue that unintended reactions with the chamber walls have a strong influence on the formed surface species, explaining scattered results in the literature. On the basis of our STM data we propose an alternative, easy way of preparing oxidized TiO2(1 1 0) surfaces with Oot adatoms (o-TiO2). It is certain that o-TiO2(1 1 0) surfaces prepared according to this recipe do not have any residual surface O vacancies. This contradicts the situation when oxidizing reduced TiO2(1 1 0) surfaces with O vacancies, where some O vacancies persist.

Three-Dimensional Hierarchical NixCo1-xO/NiyCo2-yP@C Hybrids on Nickel Foam for Excellent Supercapacitors.

Science.gov (United States)

Shao, Yubo; Zhao, Yongqing; Li, Hua; Xu, Cailing

2016-12-28

Active materials and special structures of the electrode have decisive influence on the electrochemical properties of supercapacitors. Herein, three-dimensional (3D) hierarchical Ni x Co 1-x O/Ni y Co 2-y P@C (denoted as NiCoOP@C) hybrids have been successfully prepared by a phosphorization treatment of hierarchical Ni x Co 1-x O@C grown on nickel foam. The resulting NiCoOP@C hybrids exhibit an outstanding specific capacitance and cycle performance because they couple the merits of the superior cycling stability of Ni x Co 1-x O, the high specific capacitance of Ni y Co 2-y P, the mechanical stability of carbon layer, and the 3D hierarchical structure. The specific capacitance of 2638 F g -1 can be obtained at the current density of 1 A g -1 , and even at the current density of 20 A g -1 , the NiCoOP@C electrode still possesses a specific capacitance of 1144 F g -1 . After 3000 cycles at 10 A g -1 , 84% of the initial specific capacitance is still remained. In addition, an asymmetric ultracapacitor (ASC) is assembled through using NiCoOP@C hybrids as anode and activated carbon as cathode. The as-prepared ASC obtains a maximum energy density of 39.4 Wh kg -1 at a power density of 394 W kg -1 and still holds 21 Wh kg -1 at 7500 W kg -1 .

Structural, magnetic and magnetocaloric properties of La{sub 0.7}Ca{sub 0.2}Sr{sub 0.1}Mn{sub 1−x}Cr{sub x}O{sub 3} compounds with x = 0, 0.05 and 0.1

Energy Technology Data Exchange (ETDEWEB)

Dhahri, Ah., E-mail: dhahri.ahmad@outlook.fr [Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, BP 1171, Université de Sfax, 3000 (Tunisia); Jemmali, M. [Laboratoire des Sciences des Matériaux et de l’Environnement, Faculté des Sciences de Sfax, BP 1171, Université de Sfax, 3000 (Tunisia); Taibi, K. [Département SDM, FGMGP/USTHB, 16311 (Algeria); Dhahri, E. [Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, BP 1171, Université de Sfax, 3000 (Tunisia); Hlil, E.K. [Institut Néel, CNRS et Université J. Fourier, BP 166, 38042 Grenoble (France)

2015-01-05

Highlights: • The samples crystallize in the rhombohedral structure with the R3{sup ¯}c space group. • Enhancement of T{sub C} for the rhombohedral samples. • The relative cooling power increases with Cr-doping. • All samples exhibit a large magnetocaloric effect. • High values of the magnetoresistance in all samples. - Abstract: Structural, magnetic and magnetocaloric properties of La{sub 0.7}Sr{sub 0.1}Ca{sub 0.2}Mn{sub 1−x}Cr{sub x}O{sub 3} compounds with x = 0, 0.05 and 0.1 have been investigated to shed light on Cr-doping influence. X-ray diffraction studies show that all samples crystallize in the rhombohedral symmetry with R3{sup ¯}c space group. Rietveld refinement structure shows that the insertion of Cr in Mn network modifies the structural parameters such as the volume, Mn–O–Mn angles and the Mn–O bond length. The substitution of Mn by Cr decreases the 2p-3d hybridization between O and Mn ions, reduces the bandwidth and increases the electron–phonon coupling. The investigation of magnetic and magnetocaloric properties reveals that the samples exhibit a paramagnetic(PM)–ferromagnetic (FM) transition with decreasing Curie temperature (T{sub C}) from 294 K to 255 K when Cr doping level increases. The magnetic entropy change (ΔS{sub M}{sup max}) also decreases from 6.20 J kg{sup −1} K{sup −1} for x = 0 to3.80 J kg{sup −1} K{sup −1} for x = 0.1, while the relative cooling power (RCP) increases from 234.5 to 240 J kg{sup −1}, respectively, under a magnetic field of 5 T. These outcomes suggest that Mn-site Cr doping inhibits the enhancement of the magnetocaloric effect in some perovskite manganites. This is explained by the weakening of the ferromagnetic double-exchange interaction between Mn{sup 3+} and Mn{sup 4+} ions.

Defect structure, electronic conductivity and expansion of properties of (La1−xSrx)sCo1−yNiyO3−δ

DEFF Research Database (Denmark)

Hjalmarsson, Per; Søgaard, Martin; Mogensen, Mogens Bjerg

2010-01-01

This study reports on oxygen nonstoichiometry, electronic conductivity and lattice expansion of three compositions as function of T and PO2 in the (La1−xSrx)sCo1−yNiyO3−δ (x=0.1, y=0.4; x=0.1, y=0.3; x=0.2, y=0.2) materials system. The nonstoichiometry data were successfully fitted using the itin......This study reports on oxygen nonstoichiometry, electronic conductivity and lattice expansion of three compositions as function of T and PO2 in the (La1−xSrx)sCo1−yNiyO3−δ (x=0.1, y=0.4; x=0.1, y=0.3; x=0.2, y=0.2) materials system. The nonstoichiometry data were successfully fitted using...... the itinerant electron model which indicates the existence of delocalized electronic states. This was also reflected in the high electronic conductivities, above 1000 S cm−1, measured for all three compositions. The electronic conductivity was shown to decrease linearly with the oxygen nonstoichiometry...... parameter, δ, supporting that the conductivity is dependent on p-type charge carriers. Comparing calculated p-type mobilities with data reported in literature on La1−xSrxCoO3 indicated that Ni-substitution into (La1−xSrx)sCoO3−δ increases the p-type mobility. The electronic conductivity was also found...

Order-disorder reactions in the ferroelectric perovskites Pb(Sc/sub 1/2/Nb/sub 1/2/)O/sub 3/ and Pb(Sc/sub 1/2/Ta/sub 1/2/)O/sub 3/. 2. Relation between ordering and properties

Energy Technology Data Exchange (ETDEWEB)

Stenger, C G.F.; Burggraaf, A J [Technische Hogeschool Twente, Enschede (Netherlands)

1980-10-16

The ordering of the trivalent and pentavalent cations in the pervoskites Pb(Sc/sub 1/2/Nb/sub 1/2/)O/sub 3/ and Pb(Sc/sub 1/2/Ta/sub 1/2/)O/sub 3/ can be varied by suitable heat treatments. The degree as well as the kind of order strongly affects the character of the FE ..-->.. PE phase transition. A spatially homogeneous disorder leads to a diffuse phase transition whereas a hybrid crystal with a nonhomogeneous disorder shows a sequence of two FE ..-->.. PE transitions.

Dipropyl 3,6-diphenyl-1,2-dihydro-1,2,4,5-tetrazine-1,2-dicarboxylate.

Science.gov (United States)

Rao, Guo-Wu; Hu, Wei-Xiao

2003-05-01

The title compound, C(22)H(24)N(4)O(4), was prepared from propyl chloroformate and 3,6-diphenyl-1,2-dihydro-s-tetrazine. This reaction yields the title compound rather than dipropyl 3,6-diphenyl-1,4-dihydro-s-tetrazine-1,4-dicarboxylate. The 2,3-diazabutadiene group in the central six-membered ring is not planar; the C=N double-bond length is 1.285 (2) A, and the average N-N single-bond length is 1.401 (3) A, indicating a lack of conjugation. The ring has a twist conformation, in which adjacent N atoms lie +/- 0.3268 (17) A from the plane of the ring. The molecule has twofold crystallographic symmetry.

Pathophysiological Consequences of a Break in S1P1-Dependent Homeostasis of Vascular Permeability Revealed by S1P1 Competitive Antagonism.

Science.gov (United States)

Bigaud, Marc; Dincer, Zuhal; Bollbuck, Birgit; Dawson, Janet; Beckmann, Nicolau; Beerli, Christian; Fishli-Cavelti, Gina; Nahler, Michaela; Angst, Daniela; Janser, Philipp; Otto, Heike; Rosner, Elisabeth; Hersperger, Rene; Bruns, Christian; Quancard, Jean

2016-01-01

Homeostasis of vascular barriers depends upon sphingosine 1-phosphate (S1P) signaling via the S1P1 receptor. Accordingly, S1P1 competitive antagonism is known to reduce vascular barrier integrity with still unclear pathophysiological consequences. This was explored in the present study using NIBR-0213, a potent and selective S1P1 competitive antagonist. NIBR-0213 was tolerated at the efficacious oral dose of 30 mg/kg BID in the rat adjuvant-induced arthritis (AiA) model, with no sign of labored breathing. However, it induced dose-dependent acute vascular pulmonary leakage and pleural effusion that fully resolved within 3-4 days, as evidenced by MRI monitoring. At the supra-maximal oral dose of 300 mg/kg QD, NIBR-0213 impaired lung function (with increased breathing rate and reduced tidal volume) within the first 24 hrs. Two weeks of NIBR-0213 oral dosing at 30, 100 and 300 mg/kg QD induced moderate pulmonary changes, characterized by alveolar wall thickening, macrophage accumulation, fibrosis, micro-hemorrhage, edema and necrosis. In addition to this picture of chronic inflammation, perivascular edema and myofiber degeneration observed in the heart were also indicative of vascular leakage and its consequences. Overall, these observations suggest that, in the rat, the lung is the main target organ for the S1P1 competitive antagonism-induced acute vascular leakage, which appears first as transient and asymptomatic but could lead, upon chronic dosing, to lung remodeling with functional impairments. Hence, this not only raises the question of organ specificity in the homeostasis of vascular barriers, but also provides insight into the pre-clinical evaluation of a potential safety window for S1P1 competitive antagonists as drug candidates.

Influence of CSN1S2 protein from Caprine milk Etawah Breed (EB) on histology of microglial cells in rat (Rattus norvegicus) Type-2 diabetes mellitus (T2DM)

Science.gov (United States)

Rika, Margareth; Fatchiyah

2017-11-01

Type-2 diabetes mellitus (T2DM) is a degenerative disease that causes an imbalance in the metabolism. The aim of this research is to determine the influences of CSN1S2 on the structure of microglial cells in T2DM. Rats (Rattus norvegicus) were divided into eight groups of treatment with looping three times each between treatment groups (CM) Control. The control is given a milk treatment with doses of 375 mg/kg (CM375), 750 mg/kg (CM750), and 1500 mg/kg (CM1500), T2DM (DMK), and T2DM with CSN1S2 375 mg/kg dose (DM375), 750mg/kg (DM750), and 1500 mg/kg (DM1500). The animal model T2DM was induced by a high-fat diet in the form of feed followed by injection of STZ (dose of 25 mg/kg of animal treatment) and treatment of CSN1S2 for 28 days. Brain organs were taken and analysed in histopathology stained by Hematoxylin-eosin (HE) and observed using Olympus BX53. Based on the results, it was concluded that CSN1S2 protein is influential for induction of microglial cell proliferation in animal models of T2DM, as immunity responds to the inflammatory condition in T2DM.

Formation of epitaxial Al 2O 3/NiAl(1 1 0) films: aluminium deposition

Science.gov (United States)

Lykhach, Y.; Moroz, V.; Yoshitake, M.

2005-02-01

Structure of epitaxial Al 2O 3 layers formed on NiAl(1 1 0) substrates has been studied by means of reflection high-energy electron diffraction (RHEED). The elucidated structure was compared to the model suggested for 0.5 nm-thick Al 2O 3 layers [K. Müller, H. Lindner, D.M. Zehner, G. Ownby, Verh. Dtsch. Phys. Ges. 25 (1990) 1130; R.M. Jaeger, H. Kuhlenbeck, H.J. Freund, Surf. Sci. 259 (1991) 235]. The stepwise growth of Al 2O 3 film, involving deposition and subsequent oxidation of aluminium onto epitaxial 0.5 nm-thick Al 2O 3 layers, has been investigated. Aluminium was deposited at room temperature, whereas its oxidation took place during annealing at 1070 K. The Al 2O 3 thickness was monitored by means of Auger electron spectroscopy (AES). It was found that Al 2O 3 layer follows the structure of 0.5 nm thick Al 2O 3 film, although a tilting of Al 2O 3(1 1 1) surface plane with respect to NiAl(1 1 0) surface appeared after Al deposition.

Figure S1 Figure S2

Indian Academy of Sciences (India)

WINTEC

6.8. 7.0. 7.2. 7.4. 7.6. 7.8. 8.0. 8.2. 8.4. 8.6. 8.8 ppm. 0.0. 1.8. 9.7. 5.4. 6.9. 8.1. 9.0. 10.8. 3.2. 10.3. Figure S3. NMR titration of DAN-Ia acid with NDI at 30% MeOH in CDCl3. The numbers represent the mole ratios of the DAN-acid to the repeat unit.

Role of alkali carbonate and salt in topochemical synthesis of K1/2Na1/2NbO3 and NaNbO3 templates

Science.gov (United States)

Lee, Jae-Seok; Jeon, Jae-Ho; Choi, Si-Young

2013-11-01

Since the properties of lead-free piezoelectric materials have thus far failed to meet those of lead-based materials, either chemical doping or morphological texturing should be employed to improve the piezoelectric properties of lead-free piezoelectric ceramics. The goal of this study was to synthesize plate-like K1/2Na1/2NbO3 and NaNbO3 particles, which are the most favorable templates for morphological texturing of K1/2Na1/2NbO3 ceramics. To achieve this goal, Bi2.5Na3.5Nb5O18 precursors in a plate-like shape were first synthesized and subsequently converted into K1/2Na1/2NbO3 or NaNbO3 particles that retain the morphology of Bi2.5Na3.5Nb5O18. In this study, we found that sodium or potassium carbonate does not play a major role in converting the Bi2.5Na3.5Nb5O18 precursor to K1/2Na1/2NbO3 or NaNbO3, on the contrary to previous reports; however, the salt contributes to the conversion reaction. All synthesis processes have been performed via a molten salt method, and scanning electron microscopy, scanning probe microscopy, and inductively coupled plasma mass spectroscopy were used to characterize the synthesized K1/2Na1/2NbO3 or NaNbO3 templates.

S = -1 and S = -2 few-body hypernuclei

International Nuclear Information System (INIS)

Gibson, B.F.

1997-01-01

The S = -1 and S = -2 few-body bound states are the focus of this discussion. Implications for the understanding of the baryon-baryon interaction are examined. Octet-octet coupling effects not found in conventional, non-strange nuclei are highlighted. TJNAF wave function tests for the S = -1 sector are noted. The need to identify S = -2 hypernuclei to explore the S = -2 strong interaction and to test model predictions is emphasized

Crystal structure of 5-{4′-[(2-{2-[2-(2-ammonioethoxyethoxy]ethoxy}ethylcarbamoyl]-4-methoxy-[1,1′-biphenyl]-3-yl}-3-oxo-1,2,5-thiadiazolidin-2-ide 1,1-dioxide: a potential inhibitor of the enzyme protein tyrosine phosphatase 1B (PTP1B

Directory of Open Access Journals (Sweden)

Kasi Viswanatharaju Ruddraraju

2015-04-01

Full Text Available The title compound, C24H32N4O8S, (I, crystallizes as a zwitterion. The terminal amine N atom of the [(2-{2-[2-(2-ammonioethoxyethoxy]ethoxy}ethylcarbamoyl] side chain is protonated, while the 1,2,5-thiadiazolidin-3-one 1,1-dioxide N atom is deprotonated. The side chain is turned over on itself with an intramolecular N—H...O hydrogen bond. The 1,2,5-thiadiazolidin-3-one 1,1-dioxide ring has an envelope conformation with the aryl-substituted N atom as the flap. Its mean plane is inclined by 62.87 (8° to the aryl ring to which it is attached, while the aryl rings of the biphenyl unit are inclined to one another by 20.81 (8°. In the crystal, molecules are linked by N—H...O and N—H...N hydrogen bonds, forming slabs lying parallel to (010. Within the slabs there are C—H...O and C—H...N hydrogen bonds and C—H...π interactions present.

Flexible Asymmetric Solid-State Supercapacitors by Highly Efficient 3D Nanostructured α-MnO2 and h-CuS Electrodes.

Science.gov (United States)

Patil, Amar M; Lokhande, Abhishek C; Shinde, Pragati A; Lokhande, Chandrakant D

2018-05-16

A simplistic and economical chemical way has been used to prepare highly efficient nanostructured, manganese oxide (α-MnO 2 ) and hexagonal copper sulfide (h-CuS) electrodes directly on cheap and flexible stainless steel sheets. Flexible solid-state α-MnO 2 /flexible stainless steel (FSS)/polyvinyl alcohol (PVA)-LiClO 4 /h-CuS/FSS asymmetric supercapacitor (ASC) devices have been fabricated using PVA-LiClO 4 gel electrolyte. Highly active surface areas of α-MnO 2 (75 m 2 g -1 ) and h-CuS (83 m 2 g -1 ) electrodes contribute to more electrochemical reactions at the electrode and electrolyte interface. The ASC device has a prolonged working potential of +1.8 V and accomplishes a capacitance of 109.12 F g -1 at 5 mV s -1 , energy density of 18.9 Wh kg -1 , and long-term electrochemical cycling with a capacity retention of 93.3% after 5000 cycles. Additionally, ASC devices were successful in glowing seven white-light-emitting diodes for more than 7 min after 30 s of charging. Outstandingly, real practical demonstration suggests "ready-to-sell" products for industries.

N-(5-Benzylsulfanyl-1,3,4-thiadiazol-2-yl-2-(piperidin-1-ylacetamide

Directory of Open Access Journals (Sweden)

D. S. Ismailova

2014-03-01

Full Text Available The title compound, C16H20N4OS2, was synthesized by the reaction of 2-benzylsulfanyl-5-chloroacetamido-1,3,4-thiadiazole and piperidine in a 1:2 ratio. The planes of the acetamide and 1,3,4-thiadiazole units are twisted by 10.8 (4°. The thiadiazole S atom and the acetamide O atom are syn-oriented due to a hypervalent S...O interaction of 2.628 (4 Å. In the crystal, molecules form centrosymmetric dimers via N—H...N hydrogen bonds. These dimers are further connected by C—H...O interactions into (100 layers.

Production, purification and characterization of fibrinolytic enzyme from Serratia sp. KG-2-1 using optimized media.

Science.gov (United States)

Taneja, Kapila; Bajaj, Bijender Kumar; Kumar, Sandeep; Dilbaghi, Neeraj

2017-07-01

Intravascular thrombosis is one of the major causes of variety of cardiovascular disorders leading to high mortality worldwide. Fibrinolytic enzymes from microbial sources possess ability to dissolve these clots and help to circumvent these problems in more efficient and safer way. In the present study, fibrinolytic protease with higher fibrinolytic activity than plasmin was obtained from Serratia sp. KG-2-1 isolated from garbage dump soil. Response surface methodology was used to study the interactive effect of concentration of maltose, yeast extract + peptone (1:1), incubation time, and pH on enzyme production and biomass. Maximum enzyme production was achieved at 33 °C after 24 h at neutral pH in media containing 1.5% Maltose, 4.0% yeast extract + peptone and other trace elements resulting in 1.82 folds increased production. The enzyme was purified from crude extract using ammonium sulfate precipitation and DEAE-Sephadex chromatography resulting in 12.9 fold purification with 14.9% yield. The purified enzyme belongs to metalloprotease class and had optimal activity in conditions similar to physiological environment with temperature optima of 40 °C and pH optima of 8. The enzyme was found to be stable in various solvents and its activity was enhanced in presence of Na + , K + , Ba 2+ , Cu 2+ , Mn 2+ , Hg 2+ but inhibited by Ca 2+ and Fe 3+ . Hence, the obtained enzyme may be used as potential therapeutic agent in combating various thrombolytic disorders.

Application of high-resolution photoelectron spectroscopy: Vibrational resolved C 1s and O 1s spectra of CO adsorbed on Ni(100)

Energy Technology Data Exchange (ETDEWEB)

Foehlisch, A.; Nilsson, A.; Martensson, N. [Uppsala Univ. (Sweden)] [and others

1997-04-01

There are various effects which determine the line shape of a core-level electron spectrum. These are due to the finite life-time of the core hole, inelastic scattering of the outgoing photoelectron, electronic shake-up and shake-off processes and vibrational excitations. For free atoms and molecules the different contributions to the observed line shapes can often be well separated. For solids, surfaces and adsorbates the line shapes are in general much broader and it has in the past been assumed that no separation of the various contributions can be made. In the present report the authors will show that this is indeed not the case. Surprisingly, the vibrational fine structure of CO adsorbed on Ni(100) can be resolved in the C 1s and O 1s electron spectra. This was achieved by the combination of highly monochromatized soft X-rays from B18.0 with a high resolution Scienta 200 mm photoelectron spectrometer. X-ray photoelectron spectroscopy (XPS) with tunable excitation energy yields as a core level spectroscopy atomic and site-specific information. The presented measurements allow for a determination of internuclear distances and potential energy curves in corehole ionized adsorbed molecules. The authors analysis of the c(2x2) phase CO/Ni(100) on {open_quotes}top{close_quotes} yielded a vibrational splitting of 217 +/- 2 meV for C 1s ionization. For O 1s ionization a splitting of 173 +/- 8 meV was found.

Poly[[(μ4-benzene-1,3,5-tricarboxylato-κ4O1:O1′:O2:O3bis(2,2-bipyridine-κ2N,N′(μ2-hydroxidodicopper(II] trihydrate

Directory of Open Access Journals (Sweden)

Mohamed N. El-kaheli

2014-07-01

Full Text Available In the title two-dimensional coordination polymer, {[Cu2(C9H3O6(OH(C10H8N22]·3H2O}n, each of the two independent CuII atoms is coordinated by a bridging OH group, two O atoms from two benzene-1,3,5-tricarboxylate (L ligands and two N atoms from a 2,2- bipyridine (bipy ligand in a distorted square-pyramidal geometry. Each L ligand coordinates four CuII atoms, thus forming a polymeric layer parallel to the bc plane with bipy molecules protruding up and down. The lattice water molecules involved in O—H...· O hydrogen bonding are situated in the inner part of each layer. The crystal packing is consolidated by π–π interactions between the aromatic rings of bipy ligands from neigbouring layers [intercentroid distance = 3.762 (3 Å].

Ba{sub 2}Cu{sub 2}Te{sub 2}P{sub 2}O{sub 13}: A new telluro-phosphate with S=1/2 Heisenberg chain

Energy Technology Data Exchange (ETDEWEB)

Xia, Mingjun [Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 (China); Shen, Shipeng; Lu, Jun; Sun, Young [Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China); Li, R.K., E-mail: rkli@mail.ipc.ac.cn [Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 (China)

2015-10-15

A new telluro-phosphate compound Ba{sub 2}Cu{sub 2}Te{sub 2}P{sub 2}O{sub 13} with S=1/2 Heisenberg chain has been successfully synthesized by solid state reaction and grown by flux method. Single crystal X-ray diffraction reveals that Ba{sub 2}Cu{sub 2}Te{sub 2}P{sub 2}O{sub 13} crystallizes into a monoclinic space group C2/c and cell parameters of a=17.647(3) Å, b=7.255(2) Å, c=9.191(2) Å and β=100.16 (3)°. In the structure of Ba{sub 2}Cu{sub 2}Te{sub 2}P{sub 2}O{sub 13}, one dimensional [CuTePO{sub 7}]{sup 3−} chains are formed by tetrahedral PO{sub 4} and trigonal bi-pyramidal TeO{sub 4} joining square planar CuO{sub 4} groups. Those [CuTePO{sub 7}]{sup 3−} chains are inter-connected by sharing one oxygen atom from the TeO{sub 4} group to form two dimensional layers. Magnetic susceptibility and specific heat measurements confirm that the title compound is a model one dimensional Heisenberg antiferromagnetic chain system. - Graphical abstract: Ba{sub 2}Cu{sub 2}Te{sub 2}P{sub 2}O{sub 13}, containing (CuTePO{sub 7}){sup 3−} chains formed by PO{sub 4} and TeO{sub 4} joining CuO{sub 4} groups, shows typical 1D Heisenberg antiferromagnetic chain model behavior as confirmed by magnetic measurements. - Highlights: • New telluro-phosphate Ba{sub 2}Cu{sub 2}Te{sub 2}P{sub 2}O{sub 13} has been grown. • It features layered structure composed of [CuTePO{sub 7}]{sup 3−} chains and TeO{sub 4} groups. • It shows the Heisenberg antiferromagnetic chain behavior. • It is transparent in the range of 1000–2500 nm with a UV absorption edge of 393 nm.

State-selective electron capture in collisions of ground and metastable O2+ ions with H(1s)

International Nuclear Information System (INIS)

Cabello, C N; Errea, L F; Fernandez, L; Mendez, L; Macias, A; Rabadan, I; Riera, A

2003-01-01

An ab initio calculation of the electron capture cross sections for collisions of ground and metastable states of O 2+ with H(1s) is presented. For impact energies between 0.125 and 3.4 keV amu -1 , we find good agreement between the cross sections from the ground state ion with the mixed beam experimental data of Phaneuf et al (Phaneuf A, Alvarez I, Meyer F W and Crandall D H 1982 Phys. Rev. A 26 1892)

Hierarchical domain structure of lead-free piezoelectric (Na{sub 1/2} Bi{sub 1/2})TiO{sub 3}-(K{sub 1/2} Bi{sub 1/2})TiO{sub 3} single crystals

Energy Technology Data Exchange (ETDEWEB)

Luo, Chengtao, E-mail: lchentao@vt.edu; Wang, Yaojin; Ge, Wenwei; Li, Jiefang; Viehland, Dwight [Materials Science and Engineering, Virginia Tech, Blacksburg, Virginia 24061 (United States); Delaire, Olivier [Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States); Li, Xiaobin; Luo, Haosu [Shanghai Institute of Ceramics, Chinese Academy of Sciences, 215 Chengbei Road, Jiading, Shanghai 201800 (China)

2016-05-07

We report a unique hierarchical domain structure in single crystals of (Na{sub 1/2}Bi{sub 1/2})TiO{sub 3}-xat. %(K{sub 1/2}Bi{sub 1/2})TiO{sub 3} for x = 5 and 8 by transmission electron microscopy (TEM). A high density of polar nano-domains with a lamellar morphology was found, which were self-assembled into a quadrant-like configuration, which then assembled into conventional ferroelectric macro-domains. Studies by high resolution TEM revealed that the polar lamellar regions contained a coexistence of in-phase and anti-phase oxygen octahedral tilt regions of a few nanometers in size. Domain frustration over multiple length scales may play an important role in the stabilization of the hierarchy, and in reducing the piezoelectric response of this Pb-free piezoelectric solid solution.

Critical role of sphingosine-1-phosphate receptor 2 (S1PR2) in acute vascular inflammation.

Science.gov (United States)

Zhang, Guoqi; Yang, Li; Kim, Gab Seok; Ryan, Kieran; Lu, Shulin; O'Donnell, Rebekah K; Spokes, Katherine; Shapiro, Nathan; Aird, William C; Kluk, Michael J; Yano, Kiichiro; Sanchez, Teresa

2013-07-18

The endothelium, as the interface between blood and all tissues, plays a critical role in inflammation. Sphingosine-1-phosphate (S1P) is a bioactive sphingolipid, highly abundant in plasma, that potently regulates endothelial responses through interaction with its receptors (S1PRs). Here, we studied the role of S1PR2 in the regulation of the proadhesion and proinflammatory phenotype of the endothelium. By using genetic approaches and a S1PR2-specific antagonist (JTE013), we found that S1PR2 plays a key role in the permeability and inflammatory responses of the vascular endothelium during endotoxemia. Experiments with bone marrow chimeras (S1pr2(+/+) → S1pr2(+/+), S1pr2(+/+) → S1pr2(-/-), and S1pr2(-/-) → S1pr2(+/+)) indicate the critical role of S1PR2 in the stromal compartment, in the regulation of vascular permeability and vascular inflammation. In vitro, JTE013 potently inhibited tumor necrosis factor α-induced endothelial inflammation. Finally, we provide detailed mechanisms on the downstream signaling of S1PR2 in vascular inflammation that include the activation of the stress-activated protein kinase pathway that, together with the Rho-kinase nuclear factor kappa B pathway (NF-kB), are required for S1PR2-mediated endothelial inflammatory responses. Taken together, our data indicate that S1PR2 is a key regulator of the proinflammatory phenotype of the endothelium and identify S1PR2 as a novel therapeutic target for vascular disorders.

(Dimethylformamide-κO(2-hydroxybenzoato-κ2O1,O1′[tris(1-methyl-1H-benzimidazol-2-ylmethyl-κN3amine-κN]manganese(II perchlorate dimethylformamide monosolvate

Directory of Open Access Journals (Sweden)

Baoliang Qi

2010-10-01

Full Text Available In the title complex, [Mn(C7H5O3(C27H27N7(C3H7NO]ClO4·C3H7NO, the MnII ion is coordinated in a slightly distorted monocapped trigonal-prismatic geometry. The tris(1-methyl-1H-benzimidazol-2-ylmethylamine (Mentb ligand coordinates in a tetradentate mode and the coordination is completed by a bis-chelating salicylate ligand and a dimethylformamide ligand. The hydroxy group and the ortho H atoms of the salicylate ligand were refined as disordered over two sites with occupancies of 0.581 (8 and 0.419 (8. Both disorder components of the hydroxy group form intramolecular O—H...O hydrogen bonds.

{6,6′-Dimethoxy-2,2′-[ethane-1,2-diylbis(nitrilomethylidyne]diphenolato-1κ4O1,O1′,O6,O6′:2κ4O1,N,N′,O1′}(ethanol-1κO-μ-nitrato-1:2κ2O:O′-dinitrato-1κ4O,O′-samarium(IIIzinc(II

Directory of Open Access Journals (Sweden)

Qiang Huang

2009-10-01

Full Text Available In the title heteronuclear ZnII–SmIII complex, [SmZn(C18H18N2O4(NO33(CH3CH2OH], with the hexadentate Schiff base compartmental ligand N,N′-bis(3-methoxysalicylideneethylenediamine (H2L, the SmIII and ZnII ions are triply bridged by two phenolate O atoms from the Schiff base ligand and one nitrate anion. The five-coordinate ZnII ion is in a square-pyramidal geometry formed by the donor centers of two imine N atoms, two phenolate O atoms and one of the bridging nitrate O atoms. The SmIII center is in a ten-fold coordination of O atoms, involving the phenolate O atoms, two methoxy O atoms, one ethanol O atom, and two O atoms from two nitrate anions and one from the bridging nitrate anion. In the crystal, intermolecular O—H...O and C—H...O interactions generate a layer structure extending parallel to (101.

Photochemistry of 1,1,1-Trifluoroacetone on Rutile TiO2(110)

International Nuclear Information System (INIS)

Zehr, Robert T.; Deskins, N. Aaron; Henderson, Michael A.

2010-01-01

The ultraviolet (UV) photon-induced photodecomposition of 1,1,1-trifluoroacetone (TFA) adsorbed on the rutile TiO2(110) surface has been investigated with photon stimulated desorption (PSD), temperature programmed desorption (TPD) and density functional theory (DFT). TFA adsorbed molecularly on the reduced surface (8% oxygen vacancies) in states desorbing below 300 K with trace thermal decomposition observed in TPD. Adsorption of TFA on a preoxidized TiO2(110) surface (accomplished by pre-exposure with 20 L O2) led to formation of a new TFA desorption state at 350 K, assigned to decomposition of a TFA-diolate species ((CF3)(CH3)COO). No TFA photochemistry was detected on the reduced surface. UV irradiation of TFA on the oxidized surface depleted TFA in the 350 K state, with TFA molecules in other TPD states unaffected. PSD measurements reveal that both carbonyl substituents (CH3 and CF3), as well as CO, were liberated during UV exposure at 95 K. Post-irradiation TPD showed evidence for both acetate (evolving as ketene at 650 K) and trifluoroacetate (evolving as CO2 at 600 K) as surface-bound photodecomposition products. The CO PSD product was not due to adsorbed CO, to mass spectrometer cracking of a CO-containing PSD product, or from background effects, but originated from complete fragmentation of an unidentified adsorbed TFA species. Thermodynamic analysis using DFT indicated that the photodecomposition of the TFA-diolate was likely not driven by thermodynamics alone as both pathways (CH3+trifluoroacetate and CF3+acetate) were detected when thermodynamics shows a clear preference for only one (CF3+acetate). These observations are in contrast to the photochemical behavior of acetone, butanone and acetaldehyde on TiO2(110), where only one of the two carbonyl substituent groups was observed, with a stoichiometric amount of carboxylate containing the other substituent left on the surface. We conclude that fluorination significantly alters the electronic structure of

THE REACTION BETWEEN ZnO AND MOLTEN NA2S2O7 OR K2S2O7 FORMING NA2Zn(SO4)2 OR K2Zn(SO4)2, STUDIED BY RAMAN SPECTROSCOPY AND X-RAY DIFFRACTION

DEFF Research Database (Denmark)

Berg, Rolf W.; Thorup, Niels

2005-01-01

Reactions between solid ZnO and molten Na2S2O7 or K2S2O7 at 500 are shown by Raman spectroscopy to be 1:1 reactions leading to solns. By lowering the temp. of the soln. melts, colorless crystals form. Raman spectra of the crystals are given and tentatively assigned. Crystal structures of the mon...... the three-dimensional network of the M2Zn(SO4)2 structures. Bond distances and angles compare well with literature values. Empirical correlations between S-O bond distances and av. O-S-O bond angles follow a previously found trend....

Bis(2,6-dihydroxybenzoato-κ2O1,O1′(nitrato-κ2O,O′bis(1,10-phenanthroline-κ2N,N′cerium(III

Directory of Open Access Journals (Sweden)

Hongxiao Jin

2011-01-01

Full Text Available The mononuclear title complex, [Ce(C7H5O32(NO3(C12H8N22], is isostructural to other related lanthanide structures. The Ce atom is in a pseudo-bicapped square-antiprismatic geometry formed by four N atoms from two chelating 1,10-phenanthroline (phen ligands and by six O atoms, four from two 2,6-dihydroxybenzoate (DHB ligands and the other two from a nitrate anion. π–π stacking interactions between phen and DHB ligands [centroid–centroid distances = 3.513 (3 and 3.762 (2 Å] and phen and phen ligands [face-to-face separation = 3.423 (7 Å] of adjacent complexes stabilize the crystal structure. Intramolecular O—H...O hydrogen bonds are observed in the DHB ligands.

1-O-Acetyl-3,4,6-tri-O-benzyl-2-C-bromomethyl-2-deoxy-α-d-glucopyranose

Directory of Open Access Journals (Sweden)

Henok H. Kinfe

2013-01-01

Full Text Available In the title compound, C30H33BrO6, the pyranose ring adopts a chair conformation. Two of the O-benzyl phenyl rings lie almost perpendicular to C/C/C/O plane formed by the ring atoms not attached to these O-benzyl phenyl rings, and form dihedral angles of 85.1 (2 and 64.6 (2°, while the third O-benzyl phenyl ring is twisted so that it makes a dihedral angle 34.9 (2° to this C/C/C/O plane. This twist is ascribed to the formation of an S(8 loop stabilized by a weak intramolecular C—H...O hydrogen bond.

Photoionization-induced water migration in the amide group of trans-acetanilide-(H2O)1 in the gas phase.

Science.gov (United States)

Sakota, Kenji; Harada, Satoshi; Shimazaki, Yuiga; Sekiya, Hiroshi

2011-02-10

IR-dip spectra of trans-acetanilide-water 1:1 cluster, AA-(H(2)O)(1), have been measured for the S(0) and D(0) state in the gas phase. Two structural isomers, where a water molecule binds to the NH group or the CO group of AA, AA(NH)-(H(2)O)(1) and AA(CO)-(H(2)O)(1), are identified in the S(0) state. One-color resonance-enhanced two-photon ionization, (1 + 1) RE2PI, of AA(NH)-(H(2)O)(1) via the S(1)-S(0) origin generates [AA(NH)-(H(2)O)(1)](+) in the D(0) state, however, photoionization of [AA(CO)-(H(2)O)(1)] does not produce [AA(CO)-(H(2)O)(1)](+), leading to [AA(NH)-(H(2)O)(1)](+). This observation explicitly indicates that the water molecule in [AA-(H(2)O)(1)](+) migrates from the CO group to the NH group in the D(0) state. The reorganization of the charge distribution from the neutral to the D(0) state of AA induces the repulsive force between the water molecule and the CO group of AA(+), which is the trigger of the water migration in [AA-(H(2)O)(1)](+).

Localization on AdS{sub 2}×S{sup 1}

Energy Technology Data Exchange (ETDEWEB)

David, Justin R. [Centre for High Energy Physics, Indian Institute of Science,C.V. Raman Avenue, Bangalore, 560012 (India); Gava, Edi [INFN, Sezione di Trieste,Strada Costiera 11, Trieste (Italy); Gupta, Rajesh Kumar; Narain, Kumar [ICTP,Strada Costiera 11, Trieste, 34151 (Italy)

2017-03-09

Conformal symmetry relates the metric on AdS{sub 2}×S{sup 1} to that of S{sup 3}. This implies that under a suitable choice of boundary conditions for fields on AdS{sub 2} the partition function of conformal field theories on these spaces must agree which makes AdS{sub 2}×S{sup 1} a good testing ground to study localization on non-compact spaces. We study supersymmetry on AdS{sub 2}×S{sup 1} and determine the localizing Lagrangian for N=2 supersymmetric Chern-Simons theory on AdS{sub 2}×S{sup 1}. We evaluate the partition function of N=2 supersymmetric Chern-Simons theory on AdS{sub 2}×S{sup 1} using localization, where the radius of S{sup 1} is q times that of AdS{sub 2}. With boundary conditions on AdS{sub 2}×S{sup 1} which ensure that all the physical fields are normalizable and lie in the space of square integrable wave functions in AdS{sub 2}, the result for the partition function precisely agrees with that of the theory on the q-fold covering of S{sup 3}.

Electrically detected magnetic resonance study of the Ge dangling bonds at the Ge(1 1 1)/GeO{sub 2} interface after capping with Al{sub 2}O{sub 3} layer

Energy Technology Data Exchange (ETDEWEB)

Paleari, S., E-mail: s.paleari6@campus.unimib.it [Dipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, via Cozzi 53, I-20125 Milan (Italy); Molle, A. [Laboratorio MDM, IMM-CNR, Via C. Olivetti 2, I-20864 Agrate Brianza, MB (Italy); Accetta, F. [Dipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, via Cozzi 53, I-20125 Milan (Italy); Lamperti, A.; Cianci, E. [Laboratorio MDM, IMM-CNR, Via C. Olivetti 2, I-20864 Agrate Brianza, MB (Italy); Fanciulli, M., E-mail: marco.fanciulli@unimib.it [Dipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, via Cozzi 53, I-20125 Milan (Italy); Laboratorio MDM, IMM-CNR, Via C. Olivetti 2, I-20864 Agrate Brianza, MB (Italy)

2014-02-01

The electrical activity of Ge dangling bonds is investigated at the interface between GeO{sub 2}-passivated Ge(1 1 1) substrate and Al{sub 2}O{sub 3} grown by atomic layer deposition, by means of electrically detected magnetic resonance spectroscopy (EDMR). The Al{sub 2}O{sub 3}/GeO{sub 2}/Ge stacked structure is promising as a mobility booster for the post-Si future electronic devices. EDMR proved to be useful in characterizing interface defects, even at the very low concentrations of state-of-the-art devices (<10{sup 10} cm{sup −2}). In particular, it is shown that capping the GeO{sub 2}-passivated Ge(1 1 1) with Al{sub 2}O{sub 3} has no impact on the microstructure of the Ge dangling bond.

Fertilização com N e S na recuperação de pastagem de Brachiaria brizantha cv. Marandu em neossolo quartzarênico N and S fertilization and recovery of Brachiaria brizantha cv. Marandu pasture on sandy soil

Directory of Open Access Journals (Sweden)

Patrícia Perondi Anchão Oliveira

2005-08-01

Full Text Available Com o objetivo de avaliar a resposta de pastagens degradadas de Brachiaria brizantha cv. Marandu ao uso de diferentes doses de fertilização com N e S, foi desenvolvido um experimento em campo durante dois anos, em área de cerrado em blocos ao acaso. Foram avaliados sete tratamentos, seis com diferentes combinações de doses de N e S e uma testemunha (pastagem degradada. As combinações foram: 70 kg ha-1 N sem enxofre, 140 kg ha-1 N sem enxofre, 210 kg ha-1 N sem enxofre, 70 kg ha-1 N e 77 kg ha-1 S, 140 kg ha-1 N e 153 kg ha-1 S, 210 kg ha-1 N e 230 kg ha-1 S. A reposta em produção de forragem ao uso de fertilização nitrogenada foi linear, com maior eficiência de uso do nitrogênio no segundo ano de manejo. A maior produção de forragem foi acompanhada por maior extração de N e queda nos teores de matéria orgânica no solo. A extração de enxofre foi menor que as doses de S empregadas. O critério da relação N:S na forragem na nutrição mineral da forrageira foi recomendado apenas na época das águas. Houve acúmulo de enxofre nas camadas subsuperficiais do solo.An experiment was carried out during two years on Cerrado soil with the objective of evaluating the response of degraded Brachiaria brizantha cv. Marandu pastures to different N and S fertilization doses. Seven treatments, six with different N and S combinations and a control (degraded pasture, were compared in a randomized complete blocks design. The combinations were: 70 kg ha-1 N without sulphur, 140 kg ha-1 N without sulphur, 210 kg ha-1 N without sulphur, 70 kg ha-1 N and 77 kg ha-1 S, 140 kg ha-1 N and 153 kg ha-1 S, 210 kg ha-1 N and 230 kg ha-1 S. Herbage yield response to nitrogen rates was linear, and the best efficiency of nitrogen use was obtained in the second year. The highest herbage yield was associated with higher extraction of N and smaller soil organic matter content. The sulfur extraction was lower than S doses. The N:S ratio as a criterion of the

The influence of excess K2O on the electrical properties of (K,Na)1/2Bi1/2TiO3 ceramics

Science.gov (United States)

Li, Linhao; Li, Ming; Sinclair, Derek C.

2018-04-01

The solid solution (KxNa0.50-x)Bi0.50TiO3 (KNBT) between Na1/2Bi1/2TiO3 and K1/2Bi1/2TiO3 (KBT) has been extensively researched as a candidate lead-free piezoelectric material because of its relatively high Curie temperature and good piezoelectric properties, especially near the morphotropic phase boundary (MPB) at x ˜ 0.10 (20 mol. % KBT). Here, we show that low levels of excess K2O in the starting compositions, i.e., (Ky+0.03Na0.50-y)Bi0.50TiO3.015 (y-series), can significantly change the conduction mechanism and electrical properties compared to a nominally stoichiometric KNBT series (KxNa0.50-x)Bi0.50TiO3 (x-series). Impedance spectroscopy measurements reveal significantly higher bulk conductivity (σb) values for y ≥ 0.10 samples [activation energy (Ea) ≤ 0.95 eV] compared to the corresponding x-series samples which possess bandgap type electronic conduction (Ea ˜ 1.26-1.85 eV). The largest difference in electrical properties occurs close to the MPB composition (20 mol. % KBT) where y = 0.10 ceramics possess σb (at 300 °C) that is 4 orders of magnitude higher than that of x = 0.10 and the oxide-ion transport number in the former is ˜0.70-0.75 compared to processing. This demonstrates the electrical properties of KNBT to be sensitive to low levels of A-site nonstoichiometry and indicates that excess K2O in KNBT starting compositions to compensate for volatilisation can lead to undesirable high dielectric loss and leakage currents at elevated temperatures.

O(αs2) and O(αs3) heavy flavor contributions to transversity at Q2 >> m2

International Nuclear Information System (INIS)

Bluemlein, Johannes; Klein, Sebastian; Toedtli, Beat

2009-09-01

In deep-inelastic processes the heavy flavor Wilson coefficients factorize for Q 2 >>m 2 into the light flavor Wilson coefficients of the corresponding process and the massive operator matrix elements (OMEs). We calculate the O(α s 2 ) and O(α s 3 ) massive OME for the flavor non-singlet transversity distribution. At O(α s 2 ) the OME is obtained for general values of the Mellin variable N, while at O(α s 3 ) the moments N=1 to 13 are computed. The terms ∝ T F of the 3.loop transversity anomalous dimension are obtained and results in the literature are confirmed. We discuss the relation of these contributions to the Soffer bound for transversity. (orig.)

Phase diagram study for the PbO-ZnO-CaO-SiO_2 -“Fe_2O_3 ” system in air with CaO/SiO_2 in 1.1 and PbO/(CaO+SiO_2) in 2.4 weight ratios

International Nuclear Information System (INIS)

Lopez-Rodriguez, Josue; Romero-Serrano, Antonio; Hernandez-Ramirez, Aurelio; Cruz-Ramirez, Alejandro; Almaguer-Guzman, Isaias; Benavides-Perez, Ricardo; Flores-Favela, Manuel

2017-01-01

An experimental study on the phase equilibrium and the liquidus isotherms for the PbO-ZnO-CaO-SiO_2 -“Fe_2O_3 ” system with CaO/SiO_2 in 1.1 and PbO/(CaO+SiO_2) in 2.4 weight ratios, respectively, was carried out in the temperature range 1100-1300 deg C (1373-1573 K). High temperature phases were determined by the equilibrium-quenching method. Results are presented in the form of pseudo-ternary sections “Fe_2O_3 ”-ZnO-(PbO+CaO+SiO_2). X-Ray diffraction (XRD) and SEM-EDS results showed that the phase equilibria in this system are dominated by the high melting temperature spinel and zincite phases. It was observed that if the system is at a temperature below 1300 deg C and the total (Fe_2O_3 + ZnO) is greater than 20 wt%, spinel and/or zincite will be present in the slag system. As an application of the phase diagram, the liquid phase compositions below the liquidus surface were estimated, then their viscosities were calculated using FACTSage software. (author)

CDEX-1 1 kg point-contact germanium detector for low mass dark matter searches

International Nuclear Information System (INIS)

Kang Kejun; Yue Qian; Wu Yucheng

2013-01-01

The CDEX collaboration has been established for direct detection of light dark matter particles, using ultra-low energy threshold point-contact p-type germanium detectors, in China JinPing underground Laboratory (CJPL). The first 1 kg point-contact germanium detector with a sub-keV energy threshold has been tested in a passive shielding system located in CJPL. The outputs from both the point-contact P + electrode and the outside N + electrode make it possible to scan the lower energy range of less than 1 keV and at the same time to detect the higher energy range up to 3 MeV. The outputs from both P + and N + electrode may also provide a more powerful method for signal discrimination for dark matter experiment. Some key parameters, including energy resolution, dead time, decay times of internal X-rays, and system stability, have been tested and measured. The results show that the 1 kg point-contact germanium detector, together with its shielding system and electronics, can run smoothly with good performances. This detector system will be deployed for dark matter search experiments. (authors)

Perovskites Ba/sub 2/Bsub(1/2)sup(I)Bsub(1/2)sup(III)Tesup(VI)O/sub 6/