Distributional and Ecological Notes on the Halfbeaks of Eastern Gulf of Mexico, with a Provisional Key for Their Identification

Several fishes of the halfbeak genus Hyporhamphus occurring in the Mexican Gulf of Mexico and Caribbean Sea have been misidentified or confused in the literature. Most of it has centered around the taxonomic status of H. unifasciatus (including its synonym H. roberti), which is shown to comprise a complex of three species, H. unifasciatus, the recently described H. meeki, from the western Atlantic region, and an undescribed species from the eastern Pacific Ocean. Another eastern Mexico halfbeak is the freshwater form H. mexicanus. Using Banford and Collette (1993), we examined specimens from collections at UANL, UNAM, IPN, and ECOCH and have clarified the Mexican distribution of these species. We here report additional Mexican records of H. meeki, previously known only from United States waters and from the coast of Yucatán, clarify the distribution of H. unifasciatus, and provide the first marine record of the freshwater species H. mexicanus. A distribution map and keys for identification of the eastern Mexican species are provided

Study of the teaching and learning process through ICT in a public higher education institution

En este trabajo se presenta una investigación realizada a estudiantes de educación superior, en una institución pública en el Estado de Veracruz, México, con el objetivo de mostrar el impacto de uso de la tecnología en los procesos de enseñanza y aprendizaje derivado de la pandemia del COVID 19, que intensificó el uso de medios electrónicos en este nivel; para ello se utilizó un cuestionario que fue adaptado al entorno de los estudiantes, compuesto de 13 preguntas cerradas con escala Likert y aplicado mediante un formulario en línea a 422 estudiantes del tercer semestre en adelante, de los tres programas académicos impartidos. Los resultados principales muestran que el 84% contaba con una computadora, el 98% con teléfono inteligente y el 79% con acceso a internet en su hogar para realizar sus actividades académicas; por otro lado, el 69% afirmó manejar ofimática básica, un 34.83%  identifica información relevante al evaluar fuentes de información, un poco más del 30% y 25% respondieron de acuerdo y totalmente de acuerdo, con respecto a una actitud positiva y compromiso ético en el uso de información digital; finalmente más del 50% se siente satisfecho en el uso de las Tecnologías de Información y Comunicación.ABSTRACT This paper presents an investigation conducted with higher education students in a public institution in the State of Veracruz, Mexico, with the objective of showing the impact of the use of technology in the teaching and learning processes derived from the COVID 19 pandemic, which intensified the use of electronic media at this level; for this purpose, a questionnaire was used that was adapted to the students' environment, composed of 13 closed questions with Likert scale and applied through an online form to 422 students from the third semester onwards, from the three academic programs taught. The main results show that 84% had a computer, 98% had a smartphone and 79% had internet access at home to carry out their academic activities; on the other hand, 69% said they handled basic office automation, 34.83% identified relevant information when evaluating information sources, a little more than 30% and 25% responded in agreement and totally agreed, with respect to a positive attitude and ethical commitment in the use of digital information; finally more than 50% felt satisfied in the use of Information and Communication Technologies

Caracterización de médanos parabólicos de la región pampeana oriental, centro oeste de la provincia de Buenos Aires (Argentina).

 La región pampeana, especialmente la provincia de Buenos Aires, se caracteriza por la presencia de paisajes eólicos que, si bien responden a eventos producidos en el Cuaternario Superior, en la actualidad son reactivados por la actividad agropecuaria. El objetivo de este trabajo se centra en la detección y delimitación de un campo de médanos parabólicos parcialmente reactivados, ubicados en el centro oeste de dicha provincia, que si bien han sido mencionados en la literatura, no han sido objeto de estudio detallado. Mediante la generación de un Modelo Digital de Elevaciones (MDE) a partir de imágenes SRTM (Shuttle Radar Topography Mission) se ha detectado un campo con un total de 254 médanos parabólicos que ocupan 20.200 km2, ubicados entre los 120 y 90 msnm. Los mismos presentan una dirección general SW-NE, con anchos que varían entre 2 y 5 km y alturas entre 2 y 6 m. Aplicando la herramienta Distancia Vertical al Curso (Vertical Distance to Channel Network, VDCN) del Software SAGA GIS 2.1.2 y una clasificación automática no supervisada en ArcGIS 10.1, se lograron discriminar los médanos de la planicie circundante. A partir de muestras de sedimento de un médano testigo ubicado en la localidad de 30 de Agosto (Buenos Aires), se establecieron claras diferencias en la granulometría en distintos sectores del mismo. La ubicación de estos médanos es clave en la configuración del escurrimiento y, en consecuencia, este paisaje arenoso tiene un rol importante en la configuración del espacio del área de estudio ya que se forman lagunas intermedanales someras cuyo desarrollo depende de las precipitaciones locales

PENGARUH TERPAAN BERITA PERKOSAAN DI TRIBUNNEWS.COM TERHADAP SIKAP WASPADA MAHASISWI

The research problem in this research includes whether there is the influence of rape news of UGM female student in Tribunnews.com towards female students vigilant attitude in interact and how the influence imposed. Variable X in this research is rape news, while vigilant attitude of female students in interact is variable Y. Quantitative research is implemented by means of associative type. In addition, the basic research is survey method. The population in this study is female students second period of KKN 2018/2019 University of Muhammadiyah Malang and 36 of them become the research sample. Questionnaires and documentation are implemented as data collection techniques. Validity and reliability test are also implemented as the research instrument test. Furthermore, the researcher conducts simple linear regression and hypothesis testing using the t test as data analysis techniques. The coefficient of variable X is 0.716 (positive). From the analysis results obtained that R square result (the coefficient of determination) is 0.130. R value (the correlation coefficient) is 0.361, it shows the correlation between news rape of UGM female student in Tribunnews.com towards female students vigilant attitude in interact (Y) are included in a weak category. On the other hand, t table (α = 0.05; df residual = 34) is 1.690. Since t arithmetic > t table is 2.255 > 1.690 or sig. t value (0.031) < α = 0.05, the influence of X (rape news of UGM female student in Tribunnews.com) towards Y (female students vigilant attitude in interact) is significant. In accordance with the analysis above, it can be concluded that 13% of female students vigilant attitude in interact variable (Y) is influenced by independent variable, namely rape news of UGM female student in Tribunnews.com, and yet 87% of female students vigilant attitude in interact variable is influenced by other variables

Risk factors associated with mastitis and raw milk quality in small farms of Texcoco, México

The consumption of raw milk or its use in the production of dairy products, increases the risk of transmission of diseases, caused by pathogenic organisms or toxins, which affect the quality and safety of milk, as a result of poor milking practices or improper handling of the product. The objective of the study was to determine the nutritional and physicochemical quality, the presence of aflatoxins in raw milk, as well as risk factors for mastitis, in 20 family farms in the Texcoco region of Mexico. MilkoScan FT1 was used for physicochemical and nutritional analysis of milk and somatic cells and cow health were quantified using the Somaticell test; in addition, the presence of Aflatoxin M1 was determined by lateral flow immuno-chromatogenetics. The results showed normal nutritional values of milk according to NMX-F-700-COFOCALEC-2012, which assure its quality for human. The pH varied from 5.0 - 8.4, indicating poor control of milk temperature on some farms, causing acidity problems. Logistic analysis showed that a good cleaning of the udder in the milking prevents it to be a risk factor for the increase of somatic cells and degree of mastitis, not so the type of milking and sealing of udders. The Somaticell technique®, allowed a quantitative and efficient diagnosis of clinical mastitis and no presence of aflatoxin AFM1 was found in raw milk, which ensures that there is no problem for the consumption of the product or its transformation into products Dairy.Objective: to determine the nutritional and physicochemical quality, and the presenceof aflatoxins in raw milk, as well as risk factors for developing mastitis in 20 family farmsin the region of Texcoco, Mexico.Methods: MilkoSCan FT1 was used for nutritional and physicochemical analysis ofmilk. Somatic cells were quantified and the cow’s health status was tested usingSomaticell; furthermore, the presence of Aflatoxin M1 was determined using lateral flowimmunochromatography.Results: the milk evaluated in this study reported normal nutritional values according toNMX-F-700-COFOCALEC-2012, which guarantees its quality for human consumption.The pH ranged from 5.0 to 8.4, which indicates deficient temperature control in somefarms, leading to problems with acidity. The logistical analysis showed that adequateudder cleaning during milking is important to avoid it being a risk factor for an increasein somatic cells and degree of mastitis, although not the milking technique or teatsealing. The presence of aflatoxin AFM1 was not reported in raw milk.Study implications: the Somaticell® technique renders a qualitative and efficientdiagnosis of clinical mastitis. Conclusions: raw milk quality from this region guarantees consumers with a safe andapt product for human consumption or transformation into dairy byproducts

Light-cone QCD Sum Rules for the Λ\Lambda Baryon Electromagnetic Form Factors and its magnetic moment

We present the light-cone QCD sum rules up to twist 6 for the electromagnetic form factors of the $\Lambda$ baryon. To estimate the magnetic moment of the baryon, the magnetic form factor is fitted by the dipole formula. The numerical value of our estimation is $\mu_\Lambda=-(0.64\pm0.04)\mu_N$, which is in accordance with the experimental data and the existing theoretical results. We find that it is twist 4 but not the leading twist distribution amplitudes that dominate the results.Comment: 13 page, 7 figures, accepted for publication in Euro. Phys. J.

Calculations of binding energies and masses of heavy quarkonia using renormalon cancellation

We use various methods of Borel integration to calculate the binding ground energies and masses of b-bbar and t-tbar quarkonia. The methods take into account the leading infrared renormalon structure of the hard+soft part of the binding energies E(s), and of the corresponding quark pole masses m_q, where the contributions of these singularities in M(s) = 2 m_q + E(s) cancel. Beforehand, we carry out the separation of the binding energy into its hard+soft and ultrasoft parts. The resummation formalisms are applied to expansions of m_q and E(s) in terms of quantities which do not involve renormalon ambiguity, such as MSbar quark mass, and alpha_s. The renormalization scales are different in calculations of m_q, E(s) and E(us). The MSbar mass of b quark is extracted, and the binding energies of t-tbar and the peak (resonance) energies for (t+tbar) production are obtained.Comment: 23 pages, 8 double figures, revtex4; the version to appear in Phys.Rev.D; extended discussion between Eqs.(25) and (26); the paragraph between Eqs.(32) and (33) is new and explains the numerical dependence of the residue parameter on the factorization scale; several new references were added; acknowledgments were modified; the numerical results are unchange

Intranasal administration of mesenchymal stem cell secretome reduces hippocampal oxidative stress, neuroinflammation and cell death, improving the behavioral outcome following perinatal asphyxia

Indexación: Scopus.PerinatalAsphyxia (PA) is a leading cause ofmotor and neuropsychiatric disability associated with sustained oxidative stress, neuroinflammation, and cell death, affecting brain development. Based on a rat model of global PA, we investigated the neuroprotective effect of intranasally administered secretome, derived from human adipose mesenchymal stem cells (MSC-S), preconditioned with either deferoxamine (an hypoxia-mimetic) or TNF-ff+IFN- (pro-inflammatory cytokines). PA was generated by immersing fetus-containing uterine horns in a water bath at 37 ffC for 21 min. Thereafter, 16 ffL of MSC-S (containing 6 ffg of protein derived from 2 ff 105 preconditioned-MSC), or vehicle, were intranasally administered 2 h after birth to asphyxia-exposed and control rats, evaluated at postnatal day (P) 7. Alternatively, pups received a dose of either preconditioned MSC-S or vehicle, both at 2 h and P7, and were evaluated at P14, P30, and P60. The preconditioned MSC-S treatment (i) reversed asphyxia-induced oxidative stress in the hippocampus (oxidized/reduced glutathione); (ii) increased antioxidative Nuclear Erythroid 2-Related Factor 2 (NRF2) translocation; (iii) increased NQO1 antioxidant protein; (iv) reduced neuroinflammation (decreasing nuclearNF-ffB/p65 levels and microglial reactivity); (v) decreased cleaved-caspase-3 cell-death; (vi) improved righting reflex, negative geotaxis, cliff aversion, locomotor activity, anxiety, motor coordination, and recognition memory. Overall, the study demonstrates that intranasal administration of preconditioned MSC-S is a novel therapeutic strategy that prevents the long-term effects of perinatal asphyxia. © 2020 by the authors.https://www.mdpi.com/1422-0067/21/20/780

Evidence for a mixed mass composition at the `ankle' in the cosmic-ray spectrum

We report a first measurement for ultra-high energy cosmic rays of the correlation between the depth of shower maximum and the signal in the water Cherenkov stations of air-showers registered simultaneously by the fluorescence and the surface detectors of the Pierre Auger Observatory. Such a correlation measurement is a unique feature of a hybrid air-shower observatory with sensitivity to both the electromagnetic and muonic components. It allows an accurate determination of the spread of primary masses in the cosmic-ray flux. Up till now, constraints on the spread of primary masses have been dominated by systematic uncertainties. The present correlation measurement is not affected by systematics in the measurement of the depth of shower maximum or the signal in the water Cherenkov stations. The analysis relies on general characteristics of air showers and is thus robust also with respect to uncertainties in hadronic event generators. The observed correlation in the energy range around the `ankle' at $\lg(E/{\rm eV})=18.5-19.0$ differs significantly from expectations for pure primary cosmic-ray compositions. A light composition made up of proton and helium only is equally inconsistent with observations. The data are explained well by a mixed composition including nuclei with mass $A > 4$. Scenarios such as the proton dip model, with almost pure compositions, are thus disfavoured as the sole explanation of the ultrahigh-energy cosmic-ray flux at Earth.Comment: Published version. Added journal reference and DOI. Added Report Numbe

Anisotropic flow of charged hadrons, pions and (anti-)protons measured at high transverse momentum in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}}=2.76 TeV

The elliptic, $v_2$, triangular, $v_3$, and quadrangular, $v_4$, azimuthal anisotropic flow coefficients are measured for unidentified charged particles, pions and (anti-)protons in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV with the ALICE detector at the Large Hadron Collider. Results obtained with the event plane and four-particle cumulant methods are reported for the pseudo-rapidity range $|\eta|<0.8$ at different collision centralities and as a function of transverse momentum, $p_{\rm T}$, out to $p_{\rm T}=20$ GeV/$c$. The observed non-zero elliptic and triangular flow depends only weakly on transverse momentum for $p_{\rm T}>8$ GeV/$c$. The small $p_{\rm T}$ dependence of the difference between elliptic flow results obtained from the event plane and four-particle cumulant methods suggests a common origin of flow fluctuations up to $p_{\rm T}=8$ GeV/$c$. The magnitude of the (anti-)proton elliptic and triangular flow is larger than that of pions out to at least $p_{\rm T}=8$ GeV/$c$ indicating that the particle type dependence persists out to high $p_{\rm T}$.Comment: 16 pages, 5 captioned figures, authors from page 11, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/186