Weak localization and electron-electron interaction in the layered compound CuFeTe2

The study of the electrical properties of the layered compound CuFeTe2 shows that there are three well differentiated conduction regimes depending on the temperature. Below TSDW ~ 300 K the formation of a Spin Density Wave (SDW) state has been reported, in the frame of a metal to non metal transition. Below 100 K (~ TSDW/3) the behavior of the electrical resistance as a function of temperature and magnetic field is attributable to the still present not condensed electrons (quasi particles) in the SDW state. At low temperatures (1.8 - 20K), low current (< 1 mA) and magnetic eld (0<H <6 Tesla), the effects of weak localization and electronic interactions in two dimensions appear. At intermediate temperatures (20 < T < 100 K) a hopping conductivity behavior is observed

Influence of the molecular interaction in the value of molecular volume for the isotropicnematic transition of p-azoxianisol using th emodel HERSW in conjuntion with IPCM model

In this work, we analyzed the experimental pressure-temperature behavior in the Isotropic-Nematic phase transitionfor the liquid crystal p-azoxianisol at 1 atm using a development for the HERSW Conveg Peg model. Additionally, we obtained the values of the molecular volumes for the hard and attractive cores from theoretical quantum calculations at PM3, PM6 and B3LYP/6-311++G levels considering the molecular interaction among the liquidcrystals (PAA)5. We found that the best prediction for experimental data appears when the effect of the molecular interaction is considered in the volume calculation. Specifically for a/b=3.7, V0=70.86 A3 and a/bl=1.95 the best prediction was obtained

Emission lines from rotating proto-stellar jets with variable velocity profiles. I. Three-dimensional numerical simulation of the non-magnetic case

Using the Yguazu-a three-dimensional hydrodynamic code, we have computed a set of numerical simulations of heavy, supersonic, radiatively cooling jets including variabilities in both the ejection direction (precession) and the jet velocity (intermittence). In order to investigate the effects of jet rotation on the shape of the line profiles, we also introduce an initial toroidal rotation velocity profile, in agreement with some recent observational evidence found in jets from T Tauri stars which seems to support the presence of a rotation velocity pattern inside the jet beam, near the jet production region. Since the Yguazu-a code includes an atomic/ionic network, we are able to compute the emission coefficients for several emission lines, and we generate line profiles for the H, [O I]6300, [S II]6716 and [N II]6548 lines. Using initial parameters that are suitable for the DG Tau microjet, we show that the computed radial velocity shift for the medium-velocity component of the line profile as a function of distance from the jet axis is strikingly similar for rotating and non-rotating jet models. These findings lead us to put forward some caveats on the interpretation of the observed radial velocity distribution from a few outflows from young stellar objects, and we claim that these data should not be directly used as a doubtless confirmation of the magnetocentrifugal wind acceleration models.Comment: 15 pages, 8 figures. Accepted to publication in Astronomy and Astrophysic

Global funding trends in capital markets in 2107

Artículo de revistaThe total volume of bond issuance in 2017 remained similar to that in previous years, edging down slightly as a result of the drop in public-sector issuance. As usual, there were significant differences between the regions and quarters analysed. By quarters, the year got off to a good start, with strong growth in the volume of issuance in the first quarter, followed by a slight deceleration. This pattern possibly reflects some issuers seeking to bring forward their placements in anticipation of worsening financial conditions, given the context of progressive monetary policy tightening. By region, the drop in issuance by the United States stands out, alongside the strong performance of the emerging markets. There was also a marked increase in the volume of placements in higher-risk segments, such as corporate and high-yield bonds, and in emerging markets, which reached record level

Divergent responses to thermogenic stimuli in BAT and subcutaneous adipose tissue from interleukin 18 and interleukin 18 receptor 1-deficient mice

Brown and beige adipocytes recruitment in brown (BAT) or white adipose tissue, mainly in the inguinal fat pad (iWAT), meet the need for temperature adaptation in cold-exposure conditions and protect against obesity in face of hypercaloric diets. Using interleukin18 (Il18) and Il18 receptor 1- knockout (Il18r1-KO) mice, this study aimed to investigate the role of IL18 signaling in BAT and iWAT activation and thermogenesis under both stimuli. Il18-KO, extremely dietary obesity-prone as previously described, failed to develop diet-induced thermogenesis as assessed by BAT and iWAT Ucp1 mRNA levels. Overweight when fed standard chow but not HFD, HFD-fed Il18r1-KO mice exhibited increased iWAT Ucp1 gene expression. Energy expenditure was reduced in pre-obese Il18r1-KO mice and restored upon HFD-challenge. Cold exposure lead to similar results; Il18r1-KO mice were protected against acute body temperature drop, displaying a more brown-like structure, alternative macrophage activation and thermogenic gene expression in iWAT than WT controls. Opposite effects were observed in Il18-KO mice. Thus, Il18 and Il18r1 genetic ablation disparate effects on energy homeostasis are likely mediated by divergent BAT responses to thermogenic stimuli as well as iWAT browning. These results suggest that a more complex receptor-signaling system mediates the IL18 adipose-tissue specific effects in energy expenditure.This work has been supported by European Community (FP7/2007n° 245009: “NeuroFAST”), Ministerio de Economía y Competitividad (PP and MCGG: BFU2007–62683/BFI and PP, MCGG and CD: CIBERobn (CB06/03)) and Xunta de Galicia Grants (MCGG and LL: PGIDIT06PXIB208067PR and GPC2014/030). CIBER de Fisiopatología de la Obesidad y Nutrición is an initiative of ISCIIIS

LA FAMILIA SPHACELARIACEAE (SPHACELARIALES, PHAEOPHYTA) EN LAS COSTAS DE MÉXICO

B e n t h i c a l g a e s a m p l e s o f f a m i l ySphacelariaceae were taken in severallocalities in the Mexico’s Pacific andAtlantic shores; between 1979 and1996. Also herbarium specimens arehoused i n d i f f e r e n t s h e r b a r i a w e r eexaminated to check the informationa b o u t t h i s f a m i l y, m o r e o v e r a n dextensive bibliographic revision of thefamily Sphacelariaceae (Sphacelariales,Phaeophyta) previously recorded inthe Mexico’s shores was realizated.The family Sphacelariaceae contains onegenus: Sphacelaria Lyngbye and six species;S. brachygonia Montagne, S. californica Sauvageau ex Setchell et Gardner, S. fusca(Hudson) S.F. Gray, S. novae-hollandiaeSonder, S. rigidula Kützing and S.tribuloides Meneghini; these species aredistributed in temperate and warm watersof Mexican Pacific and Atlantic shores, oneof them, S. rigidula is widely distributedfrom Ensenada, Baja California to BahíaTangolunda, Oaxaca in the Pacific andfrom Banco Chinchorro, Quintana Rooto Monte Pío, Veracruz in the Atlantic.Morphological description, reproductivestage, sustrate, tidal level, distributionrange, drawings, wave exposure, and keyfor determinations are included.Se realizaron campañas de muestreo de 1979a 1996 a lo largo de las costas del Pacífico yAtlántico de México, así mismo seefectuaron análisis de los ejemplaresdepositados en herbarios ficológicosnacionales y extranjeros con el fin de obtenerlos registros y corroborar su determinación.Se realizó una extensa recopilación y revisiónbibliográfica de las especies de la familiaSphacelariaceae (Sphacelariales, Phaeophyta)para las costas mexicanas.El análisis de esta información mostró quela familia Sphacelariaceae se encuentra representada por un género: SphacelariaLyngbye y seis especies; Sphacelariabrachygonia Montagne, S. californicaSauvaugeau ex Setchell et Gardner, S.fusca (Hudson) S. F. Gray, S. novaehollandiae Sonder, S. rigidula Kützing yS. tribuloides Meneghini; estas especiesocurren en aguas templadas y tropicales delas costas del Pacífico y Atlántico de México. S. rigidula es la que presenta el intervalo de distribución más amplio; desde Ensenada, Baja California hasta BahíaTangolunda, Oaxaca en el Pacífico y deMonte Pío, Veracruz, hasta Banco Chinchorro, Quintana Roo en el Atlántico. Losespecímenes recolectados sólo presentaron propágulos y no se evidenció la Cada especie se presenta con datos relativosa sus características morfoanátomicas,estadio reproductivo, sustrato, nivel demarea, distribución, esquemas en cámaraclara, clave dicotómica de determinación yrelación de ejemplares representativosexaminados

Triple oral beta-lactam containing therapy for Buruli ulcer treatment shortening

The potential use of clinically approved beta-lactams for Buruli ulcer (BU) treatment was investigated with representative classes analyzed in vitro for activity against Mycobacterium ulcerans. Beta-lactams tested were effective alone and displayed a strong synergistic profile in combination with antibiotics currently used to treat BU, i.e. rifampicin and clarithromycin; this activity was further potentiated in the presence of the beta-lactamase inhibitor clavulanate. In addition, quadruple combinations of rifampicin, clarithromycin, clavulanate and beta-lactams resulted in multiplicative reductions in their minimal inhibitory concentration (MIC) values. The MIC of amoxicillin against a panel of clinical isolates decreased more than 200-fold within this quadruple combination. Amoxicillin/clavulanate formulations are readily available with clinical pedigree, low toxicity, and orally and pediatric available; thus, supporting its potential inclusion as a new anti-BU drug in current combination therapies

NUEVOS REGISTROS DE CHOREONEMA THURETII EN OAXACA Y TITANODERMA PUSTULATUM VAR. CONFINE (RHODOPHYTA, CORALLINACEAE) EN LA COSTA NOROCCIDENTAL DE BAJA CALIFORNIA, MEXICO.

This paper described the thalli of Choreonema thuretii(Bornet) Schmitz and Titanoderma pustulatum var. confine (P. et H. Crouan) Y. Chamberlain; its habitat, tidallevel, reproductive stage and its distribution of theMexico’s coast.Choreonema thuretii is reported for first time fromOaxaca and Titanoderma pustulatum var. confine isreported from the northwest Coast of Baja California,México. In the Mexican’s herbariums We not foundspecimens of Titanoderma; however, during this reviewWe found new data and plants of Titanoderma in theherbarium ENCB and also We collected some samples inBaja California’s shores.En este trabajo se describen en forma detallada lostalos de Choreonema thuretii (Bornet) Schmitz yTitanoderma pustulatum var confine (P. et H. Crouan) Y.Chamberlain; así como su habitat, nivel de marea, estadíoreproductivo y su distribución en las costas de México.Choreonema thuretii se registra por primera vez parael litoral de Oaxaca, mientras que Titanoderma pustulatumvar. confine se cita para la costa noroccidental de BajaCalifornia, México. En los herbarios mexicanos no seencontraba representado este taxa, hasta que se realizó undetallado análisis de varios ejemplares donde crece comoepífito, así como la revisión de colectas exhaustivas realizadas en las costas de Baja California