Influences of thermal environment on fish growth

Indexación: Scopus.Thermoregulation in ectothermic animals is influenced by the ability to effectively respond to thermal variations. While it is known that ectotherms are affected by thermal changes, it remains unknown whether physiological and/or metabolic traits are impacted by modifications to the thermal environment. Our research provides key evidence that fish ectotherms are highly influenced by thermal variability during development, which leads to important modifications at several metabolic levels (e.g., growth trajectories, microstructural alterations, muscle injuries, and molecular mechanisms). In Atlantic salmon (Salmo salar), a wide thermal range (ΔT 6.4°C) during development (posthatch larvae to juveniles) was associated with increases in key thermal performance measures for survival and growth trajectory. Other metabolic traits were also significantly influenced, such as size, muscle cellularity, and molecular growth regulators possibly affected by adaptive processes. In contrast, a restricted thermal range (ΔT 1.4°C) was detrimental to growth, survival, and cellular microstructure as muscle growth could not keep pace with increased metabolic demands. These findings provide a possible basic explanation for the effects of thermal environment during growth. In conclusion, our results highlight the key role of thermal range amplitude on survival and on interactions with major metabolism-regulating processes that have positive adaptive effects for organisms.http://onlinelibrary.wiley.com/doi/10.1002/ece3.3239/ful

Moment method boundary conditions for multiphase Lattice Boltzmann simulations with partially-wetted walls

We propose a lattice Boltzmann approach for simulating contact angle phenomena in multiphase fluid systems. Boundary conditions for partially-wetted walls are introduced using the moment method. The algorithm with our boundary conditions allows for a maximum density ratio of 200000 for neutral wetting. The achievable density ratio decreases as the contact angle departs from 90°, but remains of the order O(102) for all but extreme contact angles. In all simulations an excellent agreement between the simulated and nominal contact angles is observe

Early Proterozoic zircons in Variscan gabbros from central Spain: Evidence of an Icartian magmatic event at mantle depths?

Depto. de Mineralogía y PetrologíaFac. de Ciencias GeológicasTRUEpu

Prevalence of Intestinal Parasites in Endangered Ashy Red Colobus Monkeys (Piliocolobus tephrosceles) in Tanzania

Intestinal parasites constitute one of the most frequent causes of gastrointestinal diseases in primates, directly affecting their health. We sampled 3 populations of the Endangered ashy red colobus monkey (Piliocolobus tephrosceles) with different levels of anthropogenic disturbance in Tanzania. We collected faecal samples (n=157) soon after defecation and fixed them in situ in 70% ethanol. We then re-fixed half of each sample in MIF (merthiolate iodine formaline) for microscopic study and saved the rest for molecular analysis. We examined helminth eggs, larvae and protozoan cysts using a light microscope after faecal sedimentation. We analysed samples positive for Giardia using Polymerase Chain Reaction (PCR) to determine genotypes. The overall prevalence of protozoan and helminth infection was 94.3% (148/157), with 64.9% (96/148) being infected by 1 species, 25.7% (38) by 2 species, and 9.5% (14) by 3 or more species. We detected 8 species of intestinal parasites: Ancylostoma sp. (13.4%), Trichuris trichiura (3.8%), Strongyloides stercoralis rhabditoid larvae (2.5%), Entamoeba chatonni (82.8%), Iodamoeba butschlii (14%), Endolimax nana (4.5%), Blastocystis hominis (2.5%) and Giardia duodenalis (14%). These species were detected in different combinations in the 3 areas, while Giardia was detected in only 1 area. The molecular analysis of positive Giardia samples showed that all of them belonged to assemblage B, which could also infect humans. However, we could not identify an exclusively anthropogenic origin of the parasitic species found. Our study contributes to our knowledge of parasitic infections in ashy monkeys in Tanzania, allowing us to assess their health status and disease risk, which in turn will help us design more successful conservation strategies for this Endangered primate in Tanzani

Chromomagnetic Dipole Moment of the Top Quark Revisited

We study the complete one-loop contributions to the chromagnetic dipole moment $\Delta\kappa$ of the top quark in the Standard Model, two Higgs doublet models, topcolor assited technicolor models (TC2), 331 models and extended models with a single extra dimension. We find that the SM predicts $\Delta\kappa = - 0.056$ and that the predictions of the other models are also consitent with the constraints imposed on $\Delta\kappa$ by low-energy precision measurements.Comment: 20 pages, 5 figures, Updat

Tumor testicular de saco vitelino con metástasis a pleura: primer caso reportado en la literatura

ResumenEl cáncer testicular es el tumor urológico maligno más común en hombres jóvenes. Más del 90% corresponden a tumores de células germinales. El objetivo del estudio es el reporte del primer caso de cáncer testicular de tumores de células germinales con metástasis a pleura.Paciente masculino de 21 años, inicia su padecimiento con dolor en hemitórax derecho; la radiografía de tórax presenta una radioopacidad en lóbulo medio de pulmón derecho y la tomografía de tórax detecta una masa intratorácica y extrapulmonar. La biopsia torácica guiada por ultrasonido muestra una masa sólida adosada a la pared torácica, con efecto de desplazamiento sobre la pleura, conocido como «efecto en cola de cometa». La biopsia fue positiva para lesión neoplásica maligna poco diferenciada de la pleura. A la exploración encontramos testículo derecho con tumoración en polo inferior el cual se corrobora por ultrasonido. Los marcadores tumorales solo con elevación de alfa-fetoproteína 295.87ng/dL y deshidrogenasa láctica en 2,380UI/L. En la tomografía de abdomen se identificó actividad ganglionar interaortocava. Realizamos orquiectomía radical derecha. Reporte patológico: tumor testicular de saco vitelino, pT1N2M1S2.En este caso se pudo comprobar que las metástasis fueron a nivel pleural, que lo ubica como una forma de diseminación excepcional.AbstractTesticular cancer is the most common malignant urologic tumor in young men. More than 90% are germ cell tumors. The aim of this study was to report the first case of germ cell tumor testicular cancer with metastasis to the pleura.A 21-year-old man had disease onset with pain in the right hemithorax. The chest x-ray showed radio-opacity in the middle lobe of the right lung. A chest tomography scan detected an intrathoracic and extrapulmonary mass. Ultrasound-guided thoracic biopsy revealed a solid mass attached to the thoracic wall, displaced over the pleura, known as the “comet tail effect”. The biopsy was positive for a poorly differentiated malignant neoplastic lesion of the pleura. Upon physical examination we encountered a right testis with a tumor at the lower pole; this was corroborated through ultrasound. In relation to tumor markers, only alpha-fetoprotein was elevated at 295.87ng/dl and lactate dehydrogenase at 2,380 IU/l. An abdominal tomography scan identified interaortocaval lymph node activity. We performed a right radical orchiectomy and the pathology report was testicular yolk sac tumor, pT1N2M1S2.In our patient, metastasis at the level of the pleura was confirmed, making this a case with an exceptional form of spread

La influencia del «engagement» en las trayectorias formativas de los estudiantes de Bachillerato

The level of academic engagement of 307 second-year high school students is analyzed based on their previous results in the studies. For data collection, a questionnaire based on the Utrecht Work Engagement Scale for Students (Carmona-Halty, Schaufeli & Salanova, 2017) was designed. The analyzes carried out confirmed that the students who obtained the highest values on the engagement scale were those who had not repeated a year in their academic history, nor had they had difficulties in the prior learning process. The data obtained is relevant for educational practice and the development of preventive orientation programs.Se analiza el nivel de engagement académico de 307 estudiantes de segundo de Bachillerato en función de sus resultados previos en los estudios. Para la recogida de datos se diseñó un cuestionario basado en la Utrecht Work Engagement Scale for Students (Carmona-Halty, Schaufeli y Salanova, 2017). Los análisis realizados confirmaron que el alumnado que obtuvo valores más elevados en la escala de engagement eran los que en su trayectoria formativa no habían repetido curso, ni habían tenido dificultades en el proceso de aprendizaje previo. Los datos obtenidos son relevantes para la práctica educativa y el desarrollo de programas de orientación preventiva

Impact of CP phases on neutrinoless double beta decay

We highlight in a model independent way the dependence of the effective Majorana mass parameter, relevant for neutrinoless double beta decay, on the CP phases of the PMNS matrix, using the most recent neutrino data including the cosmological WMAP measurement. We perform our analysis with three active neutrino flavours in the context of three kinds of mass spectra: quasi-degenerate, normal hierarchical and inverted hierarchical. If a neutrinoless double beta decay experiment records a positive signal, then assuming that Majorana masses of light neutrinos are responsible for it, we show how it might be possible to discriminate between the three kinds of spectra.Comment: 10 pages, latex, 9 eps figs, version to appear in Phys Rev

Theoretical study of lepton events in the atmospheric neutrino experiments at SuperK

Super-Kamiokande has reported the results for the lepton events in the atmospheric neutrino experiment. These results have been presented for a 22.5kT water fiducial mass on an exposure of 1489 days, and the events are divided into sub-GeV, multi-GeV and PC events. We present a study of nuclear medium effects in the sub-GeV energy region of atmospheric neutrino events for the quasielastic scattering, incoherent and coherent pion production processes, as they give the most dominant contribution to the lepton events in this energy region. We have used the atmospheric neutrino flux given by Honda et al. These calculations have been done in the local density approximation. We take into account the effect of Pauli blocking, Fermi motion, Coulomb effect, renormalization of weak transition strengths in the nuclear medium in the case of the quasielastic reactions. The inelastic reactions leading to production of leptons along with pions is calculated in a $\Delta$- dominance model by taking into account the renormalization of $\Delta$ properties in the nuclear medium and the final state interaction effects of the outgoing pions with the residual nucleus. We present the results for the lepton events obtained in our model with and without nuclear medium effects, and compare them with the Monte Carlo predictions used in the simulation and the experimentally observed events reported by the Super-Kamiokande collaboration.Comment: 23 pages, 13 figure