Luminescence Dating of Beach Dunes and Fluvial Sediments, Nayarit, Mexico

The Pacific coast of the state of Nayarit, Mexico, is dominated by extensive sand dune systems and lagoons. 16 samples from three transects through dunes near the town of Santa Cruz were collected to establish ages of the beach dune ridges and establish a robust chronology, to assist in understanding the depositional rates associated with different phases of the evolution of the strand plain. In addition, three samples were collected from a fluvial terrace on the San Pedro River which enters the Pacific near the southernmost of the dune transects. Quartz grains were extracted from the samples, and analysed using an Optically Stimulated Luminescence (OSL) method to determine stored dose and ages. The samples collected nearest the current coast have produced dates of 1500-1900AD, with samples further from the coast being progressively older, spanning a period of over 2000 years with oldest measured date of 400BC. The dates for the upper samples from the San Pedro River is consistent with the ages of the dunes nearest the coast, with the lower sample date closer to the dates of the older dunes further from the coast, indicating that this fluvial deposit was laid down over the same time period as the dune formation

Methodology to reconstruc virtual cities from the past

Postprint (published version

Synthesis, characterization of a new carbonylated zirconium metallocene using a dichloro-zirconocene derived from partially alkylated s-indacene

Indexación: ScieloThis work describes the synthesis and characterization of new organometallic species, an unprecedented mononuclear zirconium complex bearing a tetraalkylated s-indacene ligand, and secondly, its respective dicarbonyl complex obtained by reduction with Mg/HgCl2. Theoretical calculations of these two compounds were carried out to gain further understanding of these novel molecular systems.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072009000300014&lng=es&nrm=is

Spontaneous Symmetry Breakdown in non-relativistic Quantum Mechanics

The advantages and disadvantages of some pedagogical non-relativistic quantum-mechanical models, used to illustrate spontaneous symmetry breakdown, are discussed. A simple quantum-mechanical toy model (a spinor on the line, subject to a magnetostatic interaction) is presented, that exhibits the spontaneous breakdown of an internal symmetry.Comment: 19 pages, 5 figures. arXiv admin note: substantial text overlap with arXiv:1111.1213. Equations (30) and (31) have been corrected. Other minor correction

Análisis bibliométrico de la situación de las mujeres investigadoras de Ciencias Sociales y Jurídicas en España

This paper presents a bibliometric study analyzing the productivity and citations of female researchers in the fields of social sciences and law in Spain, within the context of Spanish scientific journals. The study was based on the rankings of researchers included in the Índice de Impacto de las Revistas Españolas de Ciencias Sociales (INRECS) and Índice de Impacto de las Revistas Españolas de Ciencias Jurídicas (INRECJ). Eleven different scientific disciplines were analyzed and the final sample consisted of 3,370 researchers, of whom 30 % were women. To study gender differences four variables were selected and analyzed: number of papers, number of citations, number of international citations and citation average. The results show that women in the 11 areas studied have both a lower productivity and a lower number of citations. On the other hand, in some areas women do receive a greater number of international citations and in almost all areas achieve higher citation averages. However the presence of women in the rankings and among the Spanish research elite is still small.Se presenta un estudio bibliométrico cuyo objetivo es analizar la productividad y la citación de las investigadoras en las Ciencias Sociales y Jurídicas en España en el marco de las revistas científi cas nacionales. Como fuente de información se han empleado los rankings de investigadores/as presentes en el Índice de Impacto de las Revistas Españolas de Ciencias Sociales (INRECS) y el Índice de Impacto de las Revistas Españolas de Ciencias Jurídicas (INRECJ). El estudio analiza 11 disciplinas científicas diferentes y la muestra final de investigadores/as extraídos de dichos rankings ha sido de 3.370 de las que el 30 % eran mujeres. Para estudiar las diferencias de géneros se han seleccionado y analizado cuatro variables: el número de trabajos publicados, el número de citas obtenidas, número de citas internacionales y el promedio de citas. Los resultados muestran como las mujeres en las 11 áreas analizadas tienen una menor productividad así como un menor número de citas bruto. Por otro lado las mujeres en diversas áreas sí obtienen un mayor número de citas internacionales y en casi todas alcanzan promedios de citas mayores. Sin embargo aún es escasa la presencia de las mujeres en los rankings y en la élite científica española

Estudio del manejo de serpientes venenosas y actuación en caso de mordedura

La tenencia de serpientes venenosas, ya sea como mascotas o como miembros de exposiciones o de parques zoológicos, requiere de las instalaciones y de la infraestructura necesarias para garantizar la seguridad de los propietarios, y del conocimiento de su manejo. Los dispositivos utilizados tienen diversos fines: protección personal (gafas, guantes, polainas, botas), sujeción (ganchos, tubos de contención, bolsas de transporte) o alimentación (pinzas, abrebocas, sondas). En caso de mordedura, se debe recurrir a asistencia hospitalaria para que se proceda a la administración del suero antiofídico específico lo antes posible. Como primeros auxilios se debe mantener a la víctima tranquila e inmóvil, limpiar la mordedura y aplicar una bomba de succión de veneno.When venomous snakes are keep in captivity, as a pet or spice as a part of collections from zoo, some infrastructure and facilities for ensuring the people safety must be available and the staff must know how to use them. Many devices for the snakes handling have been marketed: personal protection equipment (glasses, gloves, shoes, gaiter), snake fastening devices (hooks, restlessness tubes, transport bags) or feeding gadgets (tweezers, mouth openers, feeding tubes). When somebody is bitten, hospital emergency service must be requested as soon as possible and so the specific antivenom serum will be administered. The first aid would consist on keeping the bitten individual at ease and at rest, cleaning the bite injury and using a venom suction pump

Positron Emission Tomography-Computed Tomography and Magnetic Resonance Imaging Assessments in a Mouse Model of Implant-Related Bone and Joint Staphylococcus aureus Infection.

Osteomyelitis is an infection of the bone, associated with an inflammatory process. Imaging plays an important role in establishing the diagnosis and the most appropriate patient management. However, data are lacking regarding the use of preclinical molecular imaging techniques to assess osteomyelitis progression in experimental models. This study aimed to compare structural and molecular imaging to assess disease progression in a mouse model of implant-related bone and joint infections caused by Staphylococcus aureus. In SWISS mice, the right femur was implanted with a resorbable filament impregnated with S. aureus (infected group, n = 10) or sterile culture medium (uninfected group, n = 6). Eight animals (5 infected, 3 uninfected) were analyzed with magnetic resonance imaging (MRI) at 1, 2, and 3 weeks postintervention, and 8 mice were analyzed with [18F]fluorodeoxyglucose (FDG)-positron emission tomography (PET)-computed tomography (CT) at 48 h and at 1, 2, and 3 weeks postintervention. In infected animals, CT showed bone lesion progression, mainly in the distal epiphysis, although some uninfected animals presented evident bone sequestra at 3 weeks. MRI showed a lesion in the articular area that persisted for 3 weeks in infected animals. This lesion was smaller and less evident in the uninfected group. At 48 h postintervention, FDG-PET showed higher joint uptake in the infected group than in the uninfected group (P = 0.025). Over time, the difference between groups increased. These results indicate that FDG-PET imaging was much more sensitive than MRI and CT for differentiating between infection and inflammation at early stages. FDG-PET clearly distinguished between infection and postsurgical bone healing (in uninfected animals) from 48 h to 3 weeks after implantation. IMPORTANCE Our results encourage future investigations on the utility of the model for testing different therapeutic procedures for osteomyelitis.We thank Yolanda Sierra, Alexandra de Francisco, and María de la Jara Felipe, from the Imaging Laboratory for Small Animals of the Instituto de Investigación Sanitaria, Gregorio Marañón, for their excellent work with animal preparation and imaging protocols. Additionally, we thank Daniel Calle, from the Advanced Imaging Unit of CNIC, for his help in imaging postprocessing. This study was partially supported by the Instituto de Salud Carlos III (grants PI20/ 01632 and PT20/00044), cofunded by the European Regional Development Fund (ERDF), A way to make Europe. This work was also supported by the Diagnosis and Treatment Follow-up of Severe Staphylococcal Infections with Anti-Staphylococcal Antibodies and Immune-PET project of the Grant Fundación BBVA a Equipos de Investigación Científica 2018, by the Fundación Ramón Areces, and by Comunidad de Madrid (S2022/BMD-7403 RENIM-CM). The CNIC is supported by the Instituto de Salud Carlos III (ISCIII), the Ministerio de Ciencia e Innovación (MCIN), and the Pro CNIC Foundation, and it is a Severo Ochoa Center of Excellence (grant CEX2020-001041-S, funded by MICIN/AEI/10.13039/501100011033).S

Health status and productivity of sheep fed coffee pulp during fattening

The objective of this study was to evaluate the productivity and health of fattening lambs fed different levels of coffee pulp in their diets. Thirty-five crossbred lambs with an average weight of 21.8 kg were fed isoproteic and isoenergetic diets with different percentages of coffee pulp (T0: control; T1: 7%; T2: 14%, T3: 21% and T4: 28%), the base diet was formulated with corn, soybean meal, alfalfa stubble, molasses, urea and mineral salt. The fattening period was 98 days. Productivity was measured by weight gain, feed intake and feed conversion. At the beginning and end of the study, blood samples were taken to determine the health status using a biochemical profile and blood count. Analysis of variance was performed using the initial weight as the covariate for the productive variables and the initial values of the analytes in the blood chemistry and hematological analysis tests. The coffee pulp did not affect productivity, although the amount of neutrophils decreased (P<0.05) as the coffee pulp in the diet increased. In all treatments, urea exceeded the reference values, whereas creatinine was below the reference values. We concluded that the inclusion of up to 28% coffee pulp in the diet did not affect the productive parameters, decreases the neutrophil count without affect health status of lambs during fattening