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Silvotti, R.,Schuh, S.,Kim, S.-L.,Lutz, R.,Reed, M.,Benatti, S.,Janulis, R.,Lanteri, L.,Østensen, R.,Marsh, T. R.,Dhillon, V. S.,Paparo, M.,Molnar, L. Springer-Verlag 2018 Astronomy and astrophysics Vol.611 No.-
<P>V391 Peg (alias HS 2201+2610) is a subdwarf B (sdB) pulsating star that shows both <I>p</I>- and <I>g</I>-modes. By studying the arrival times of the <I>p</I>-mode maxima and minima through the O-C method, in a previous article the presence of a planet was inferred with an orbital period of 3.2 years and a minimum mass of 3.2 <I>M</I>Jup. Here we present an updated O-C analysis using a larger data set of 1066 h of photometric time series (~2.5× larger in terms of the number of data points), which covers the period between 1999 and 2012 (compared with 1999-2006 of the previous analysis). Up to the end of 2008, the new O-C diagram of the main pulsation frequency (<I>f</I>1) is compatible with (and improves) the previous two-component solution representing the long-term variation of the pulsation period (parabolic component) and the giant planet (sine wave component). Since 2009, the O-C trend of <I>f</I>1 changes, and the time derivative of the pulsation period (<I>p</I><SUP>.</SUP>) passes from positive to negative; the reason of this change of regime is not clear and could be related to nonlinear interactions between different pulsation modes. With the new data, the O-C diagram of the secondary pulsation frequency (<I>f</I>2) continues to show two components (parabola and sine wave), like in the previous analysis. Various solutions are proposed to fit the O-C diagrams of <I>f</I>1 and <I>f</I>2, but in all of them, the sinusoidal components of <I>f</I>1 and <I>f</I>2 differ or at least agree less well than before. The nice agreement found previously was a coincidence due to various small effects that are carefully analyzed. Now, with a larger dataset, the presence of a planet is more uncertain and would require confirmation with an independent method. The new data allow us to improve the measurement of <I>p</I><SUP>.</SUP> for <I>f</I>1 and <I>f</I>2: using only the data up to the end of 2008, we obtain <I>p</I><SUP>.</SUP>1 = (1.34 ± 0.04) × 10<SUP>−12</SUP> and <I>p</I><SUP>.</SUP>2 = (1.62 ± 0.22) × 10<SUP>−12</SUP>. The long-term variation of the two main pulsation periods (and the change of sign of <I>p</I><SUP>.</SUP>1) is visible also in direct measurements made over several years. The absence of peaks near <I>f</I>1 in the Fourier transform and the secondary peak close to <I>f</I>2 confirm a previous identification as <I>l</I> = 0 and <I>l</I> = 1, respectively, and suggest a stellar rotation period of about 40 days. The new data allow constraining the main <I>g</I>-mode pulsation periods of the star.</P>
X-ray Magnetic Dichroism in (Zn,Mn)O Diluted Magnetic Semiconductors: First-principles Calculations
V. N. Antonov,L. V. Bekenov,D. V. Mazur,L. P. Germash 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.11
The electronic structure of (Zn,Mn)O diluted magnetic semiconductors was investigated theoretically from first principles by using the fully-relativistic Dirac linear muffin-tin orbital band structure method with the local spin-density approximation (LSDA) and the LSDA+U approach. The X-ray magnetic circular dichroism (XMCD) spectra at the Mn, Zn, and O K and Mn L2,3 edges were investigated theoretically from first principles. The origin of the XMCD spectra in these compounds was examined. The effect of oxygen vacancy atoms was found to be crucial for the X-ray magnetic dichroism at the Mn L2,3 edges. The calculated results are compared with available experimental data.
Ngo Van Le 조선대학교 국제문화연구원 2009 국제문화연구 Vol.2 No.1
Mekong delta is the largest delta in Vietnam with an area of 39000㎢, or 12% of the country’s. Therefore, the delta, together with Hochiminh City, has been and will be playing a very crucial role in Vietnam’s cultural-economic development strategies. Yet, while Mekong delta is a fairly new land in comparison with our nation’s long history, it has been a “promise land” or a “land of hope” to many migrants who have migrated to and resided over the delta in their pursuing of wealth and happiness. Many generations of the Vietnamese, side by side with other ethnic peoples, have exploited and protected the region which resulted in several magical achievements during wars against foreign invaders as well as in peace time. Mekong Delta is resided by multi-ethnic peoples. These peoples, who are different in terms of economic development level, social structure and religion, have come to existence over the land at different time points. However, through long history of co-residence, due to cultural exchange and acculturation, among the peoples there have emerged many common cultural features and this process is currently still on progress under proactive influences of modern circumstance. As a result, there have been many religions in the delta; besides world religions such as Buddhism, Christianity, and Islam, there have existed local religions. Obviously, these religions contribute greatly to the cultural diversity of the whole southern part of the country. The Vietnamese is a majority people in the region. The culture of the Vietnamese in Mekong delta has selectively inherited cultural values of Vietnamese tradition. During their residing in the delta, the people has also adopted and created cultural features that are adaptative to natural and social environment of the region. For instance, at the end of 19^(th) century and early 20^(th) century, the Vietnamese in Mekong delta created several religions with ubiquitous local identities. In general, local religions have played very crucial roles in the life of the Vietnamese in the delta; however, their impacts have seldom spread out of the Vietnamese communities. In this paper, by viewing religion as both a social phenomenon and a cultural one, I concentrate on proposing the reasons for the birth of local religions of the Vietnamese in Southern Vietnam at the end of 19^(th) and early 20^(th) century. Also, I want to take a look at these religions’ impacts over cultural life of the people in the region. Assumedly, they were born under specific conditions of the South and only have impacts upon the life of the people. Furthermore, the paper proposes that, on one hand, the Vietnamese in the South have selectively inherited traditional cultural values which have created Vietnamese cultural values as the whole; on the other hand, they have made their own ones within the context of their new living conditions.
Patil, C.E.,Tarwal, N.L.,Jadhav, P.R.,Shinde, P.S.,Deshmukh, H.P.,Karanjkar, M.M.,Moholkar, A.V.,Gang, M.G.,Kim, J.H.,Patil, P.S. Elsevier 2014 Current Applied Physics Vol.14 No.3
Vanadium pentoxide (V<SUB>2</SUB>O<SUB>5</SUB>) mixed tungsten trioxide (WO<SUB>3</SUB>) thin films have been synthesized by a novel pulsed spray pyrolysis technique (PSPT) on glass and fluorine doped tin oxide (FTO) coated glass substrates at 400 <SUP>o</SUP>C. Aqueous solutions of equimolar vanadium chloride and ammonium tungstate were mixed in volume proportions (5%, 10% and 15%) for the deposition of V<SUB>2</SUB>O<SUB>5</SUB>-WO<SUB>3</SUB> thin films. The structural, morphological, optical and electrochemical properties of V<SUB>2</SUB>O<SUB>5</SUB>-WO<SUB>3</SUB> thin films were investigated by FT-IR, XRD, SEM, cyclic voltammetry, chronoamperometry and chronocoulometry techniques. The results showed that the electrochemical properties of V<SUB>2</SUB>O<SUB>5</SUB> were altered by mixing WO<SUB>3</SUB>. All the films exhibited cathodic electrochromism in lithium containing electrolyte (0.5 M LiClO<SUB>4</SUB> + propylene carbonate (PC)). Maximum coloration efficiency (CE) of about 49 cm<SUP>2</SUP> C<SUP>-1</SUP> was observed for the V<SUB>2</SUB>O<SUB>5</SUB> film mixed with 15% WO<SUB>3</SUB>. The electrochemical stability of the sample was examined and it was found to be stable up to 1000 cycles.
C.E. Patil,N.L. Tarwal,P.R. Jadhav,P.S. Shinde,H.P. Deshmukh,J.D. Song,A.V. Moholkar,M.G. Gang,김진혁,P.S. Patil 한국물리학회 2014 Current Applied Physics Vol.14 No.3
Vanadium pentoxide (V2O5) mixed tungsten trioxide (WO3) thin films have been synthesized by a novel pulsed spray pyrolysis technique (PSPT) on glass and fluorine doped tin oxide (FTO) coated glass substrates at 400 C. Aqueous solutions of equimolar vanadium chloride and ammonium tungstate were mixed in volume proportions (5%, 10% and 15%) for the deposition of V2O5eWO3 thin films. The structural, morphological, optical and electrochemical properties of V2O5eWO3 thin films were investigated by FT-IR, XRD, SEM, cyclic voltammetry, chronoamperometry and chronocoulometry techniques. The results showed that the electrochemical properties of V2O5 were altered by mixing WO3. All the films exhibited cathodic electrochromism in lithium containing electrolyte (0.5 M LiClO4 þ propylene carbonate (PC)). Maximum coloration efficiency (CE) of about 49 cm2 C1 was observed for the V2O5 film mixed with 15% WO3. The electrochemical stability of the sample was examined and it was found to be stable up to 1000 cycles.
Laureano S. Frizzo,María V. Zbrun,Lorena P. Soto,Ezequiel Bertozzi,Gabriel J. Sequeira,Luis E. Marti,Marcelo L. Signorini,Roberto Rodríguez Armesto,Marcelo R. Rosmini 대한수의학회 2012 JOURNAL OF VETERINARY SCIENCE Vol.13 No.3
The purpose of this study was to evaluate the capacity of a lactic acid bacteria (LAB) inoculum to protect calves with or without lactose supplements against Salmonella Dublin infection by evaluating histopathological lesions and pathogen translocation. Fifteen calves were divided into three groups [control group (C-G), a group inoculated with LAB (LAB-G), and a group inoculated with LAB and given lactose supplements (L-LAB-G)] with five, six, and four animals, respectively. The inoculum, composed of Lactobacillus (L.) casei DSPV 318T, L. salivarius DSPV 315T, and Pediococcus acidilactici DSPV 006T, was administered with milk replacer. The LAB-G and L-LAB-G received a daily dose of 109 CFU/kg body weight of each strain throughout the experiment. Lactose was provided to the L-LAB-G in doses of 100 g/day. Salmonella Dublin (2 × 1010 CFU) was orally administered to all animals on day 11 of the experiment. The microscopic lesion index values in target organs were 83%, 70%, and 64.3% (p < 0.05) for the C-G, LAB-G, and L-LAB-G, respectively. Administration of the probiotic inoculum was not fully effective against infection caused by Salmonella. Although probiotic treatment was unable to delay the arrival of pathogen to target organs, it was evident that the inoculum altered the response of animals against pathogen infection.
Kandhare, Amit D.,Kumar, V. Shiva,Adil, Mohammad,Rajmane, Anuchandra R.,Ghosh, Pinaki,Bodhankar, Subhash L. 경희한의학연구센터 2012 Oriental Pharmacy and Experimental Medicine Vol.12 No.4
Peptic ulcer owes its pathological features to disregulated oxido-nitrosative and necrotic changes in gastrointestinal mucosa. Xanthium strumarium L. is a ubiquitous, abundant herb possessing an array of pharmacological properties. In view of anti-inflammatory and antioxidant activity of Xanthium strumarium L., the present investigation was designed to unravel its antiulcer potential in pylorus ligation induced gastric ulcer in laboratory animals. X. srtumarium L. leaves were extracted by refluxing with 95 % ethanol to obtained X. srtumarium L. ethanolic extract (XSEE). After 1 h pretreatment period of XSEE (100, 200 and 400 mg/kg) gastric ulcer was induced by ligation of pylorus portion of stomach. Various parameters including volume of gastric fluid, pH of gastric fluid, free as well as total acidity were measured in the gastric fluid whereas ulcer area, ulcer index, mucin content, superoxide dismutase, myeloperoxidase, nitric oxide, total calcium, histamine level, membrane bound inorganic phosphate (Na-K-ATPase), TNF-${\alpha}$ level, DNA fragmentation were determined in the gastric tissue. Pretreatment with XSEE (200 and 400 mg/kg) significantly and dose dependently (P<0.01 and P<0.001) decreased ulcer area, ulcer index, macroscopical gastric damage score, volume of gastric fluid, free acidity as well as total acidity and mucin content. It also significantly increased pH of gastric fluid. Rats treated with XSEE (200 and 400 mg/kg) significantly and dose dependently (P<0.01 and P<0.001) attenuated decreased level of superoxide dismutase, nitric oxide and Na-K-ATPase. It also significantly decreased level of myeloperoxidase, calcium and inflammatory cytokine i.e. TNF-${\alpha}$. XSEE treated rats showed significant reduction in the pylorus ligation induced apoptotic changes. The possible mechanism by which Xanthium strumarium exerts its gastro-protective action may be due to free radical quenching, DNA repair and down regulation of oxidative-nitrosative stress along with cytokines.
Local electronic structure of Mn dopants in ZnO probed by resonant inelastic x-ray scattering
Chang, G S,Kurmaev, E Z,Jung, S W,Kim, H-J,Yi, G-C,Lee, S-I,Yablonskikh, M V,Pedersen, T M,Moewes, A,Finkelstein, L D IOP Pub 2007 Journal of physics, an Institute of Physics journa Vol.19 No.27
<P>The electronic structure of Mn dopants in ZnO epitaxial thin films synthesized at different temperatures has been investigated using resonant inelastic x-ray scattering. The resulting Mn L<SUB>2,3</SUB> x-ray emission spectra of Zn<SUB>0.8</SUB>Mn<SUB>0.2</SUB>O (resonantly excited at L<SUB>2</SUB> and L<SUB>3</SUB> absorption edges) reveal different spectral features depending on the growth temperature of the films. The relative integral intensity ratio of Mn L<SUB>2</SUB> to Mn L<SUB>3</SUB> emission lines is greatly suppressed in the case of nonmagnetic Zn<SUB>0.8</SUB>Mn<SUB>0.2</SUB>O grown at 700 °C due to L<SUB>2</SUB>L<SUB>3</SUB>M<SUB>4,5</SUB> Coster–Kronig transitions. The ferromagnetic sample grown at 600 °C exhibits a normal oxide structure. The results suggest that a high growth temperature causes direct Mn–Mn bonds from the segregation of Mn atoms in ZnO. Therefore the disappearance of ferromagnetism in Mn-doped ZnO can be attributed to antiferromagnetic Mn–Mn exchange interactions due to the inhomogeneous local environment around the Mn impurities.</P>
Model independent expansion history from supernovae: Cosmology versus systematics
L’Huillier, Benjamin,Shafieloo, Arman,Linder, Eric V,Kim, Alex G Oxford University Press 2019 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.485 No.2
<B>Abstract</B><P>We examine the Pantheon supernovae distance data compilation in a model independent analysis to test the validity of cosmic history reconstructions beyond the concordance ΛCDM cosmology. Strong deviations are allowed by the data at z ≳ 1 in the reconstructed Hubble parameter, Om diagnostic, and dark energy equation of state. We explore three interpretations: 1) possibility of the true cosmology being far from ΛCDM, 2) supernovae property evolution, and 3) survey selection effects. The strong (and theoretically problematic) deviations at z ≳ 1 vanish and good consistency with ΛCDM is found with a simple Malmquist-like linear correction. The adjusted data is robust against the model independent iterative smoothing reconstruction. However, we caution that while by eye the original deviation from ΛCDM is striking, χ2 tests do not show the extra linear correction parameter is statistically significant, and a model-independent Gaussian Process regression does not find significant evidence for the need for correction at high-redshifts.</P>
López-Cánovas Juan L.,Hermán-Sánchez Natalia,del Rio-Moreno Mercedes,Fuentes-Fayos Antonio C.,Lara-López Araceli,Sánchez-Frias Marina E.,Amado Víctor,Ciria Rubén,Briceño Javier,de la Mata Manuel,Casta 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-
Hepatocellular carcinoma (HCC) pathogenesis is associated with alterations in splicing machinery components (spliceosome and splicing factors) and aberrant expression of oncogenic splice variants. We aimed to analyze the expression and potential role of the spliceosome component PRPF8 (pre-mRNA processing factor 8) in HCC. PRPF8 expression (mRNA/protein) was analyzed in a retrospective cohort of HCC patients (n = 172 HCC and nontumor tissues) and validated in two in silico cohorts (TCGA and CPTAC). PRPF8 expression was silenced in liver cancer cell lines and in xenograft tumors to understand the functional and mechanistic consequences. In silico RNAseq and CLIPseq data were also analyzed. Our results indicate that PRPF8 is overexpressed in HCC and associated with increased tumor aggressiveness (patient survival, etc.), expression of HCC-related splice variants, and modulation of critical genes implicated in cancer-related pathways. PRPF8 silencing ameliorated aggressiveness in vitro and decreased tumor growth in vivo. Analysis of in silico CLIPseq data in HepG2 cells demonstrated that PRPF8 binds preferentially to exons of protein-coding genes, and RNAseq analysis showed that PRPF8 silencing alters splicing events in multiple genes. Integrated and in vitro analyses revealed that PRPF8 silencing modulates fibronectin (FN1) splicing, promoting the exclusion of exon 40.2, which is paramount for binding to integrins. Consistent with this finding, PRPF8 silencing reduced FAK/AKT phosphorylation and blunted stress fiber formation. Indeed, HepG2 and Hep3B cells exhibited a lower invasive capacity in membranes treated with conditioned medium from PRPF8-silenced cells compared to medium from scramble-treated cells. This study demonstrates that PRPF8 is overexpressed and associated with aggressiveness in HCC and plays important roles in hepatocarcinogenesis by altering FN1 splicing, FAK/AKT activation and stress fiber formation.