An Extended Linear Discontinuous Method for One-group Fixed Source Discrete Ordinates Problems with Isotropic Scattering in Slab Geometry

[EN] Nowadays, the obtainment of an accurate numerical solution of fixed source discrete ordinates problems is relevant in many areas of engineering and science. In this work, we extend the hybrid Finite Element Spectral Green¿s Function method (FEM-SGF), originally developed to solve eigenvalue diffusion problems, for fixed source problems using as a mathematical model, the discrete ordinates formulation in one energy group with isotropic scattering in slab geometry. This new method, Extended Linear Discontinuous Discrete Ordinates (ELD-SN), is based on the use of neutron balance equations and the construction of a hybrid auxiliary equation. This auxiliary equation combines a linear discontinuous approximation and spectral parameters to approximate the neutron angular flux inside the cell. Numerical results for benchmark problems are presented to illustrate the accuracy and computational performance of our methodology. ELD-SN method is free from spatial truncation errors in S 2 quadrature, and generate good results in the other quadrature sets. This method is more accurate than the conventional Diamond Difference (DD) and Linear Discontinuous (LD) methods, but surpassed by the Spectral Green¿s Function (SGF) method, for quadrature order greater than twoRivas-Ortiz, I.; Dominguez, D.; Hernandez, C.; Iglesias, S.; Escrivá, A. (2019). An Extended Linear Discontinuous Method for One-group Fixed Source Discrete Ordinates Problems with Isotropic Scattering in Slab Geometry. TEMA: Tendências em Matemática Aplicada e Computacional (Online). 20(1):61-76. https://doi.org/10.5540/tema.2019.020.01.061S617620

Long-Term Phenotypic and Proteomic Changes Following Vitrified Embryo Transfer in the Rabbit Model

[EN] This study was conducted to demonstrate how a vitrified embryo transfer procedure incurs phenotypic and molecular changes throughout life. This study reports the first evidence describing that embryonic manipulation during a vitrified embryo transfer cycle induced molecular modifications, concerning oxidative phosphorylation and dysregulations in zinc and lipid metabolism in liver tissue, which has been reported as responsible for postnatal variations of the phenotype. Nowadays, assisted reproductive technologies (ARTs) are considered valuable contributors to our past, but a future without their use is inconceivable. However, in recent years, several studies have evidenced a potential impact of ART on long-term development in mammal species. To date, the long-term follow-up data are still limited. So far, studies have mainly focused on in vitro fertilization or in vitro culture, with information from gametes/embryos cryopreservation field being practically missing. Herein, we report an approach to determine whether a vitrified embryo transfer procedure would have long-term consequences on the offspring. Using the rabbit as a model, we compared animals derived from vitrified-transferred embryos versus those naturally conceived, studying the growth performance, plus the weight throughout life, and the internal organs/tissues phenotype. The healthy status was assessed over the hematological and biochemical parameters in peripheral blood. Additionally, a comparative proteomic analysis was conducted in the liver tissue to investigate molecular cues related to vitrified embryo transfer in an adult tissue. After vitrified embryo transfer, birth weight was increased, and the growth performance was diminished in a sex-specific manner. In addition, vitrified-transferred animals showed significantly lower body, liver and heart weights in adulthood. Molecular analyses revealed that vitrified embryo transfer triggers reprogramming of the liver proteome. Functional analysis of the differentially expressed proteins showed changes in relation to oxidative phosphorylation and dysregulations in the zinc and lipid metabolism, which has been reported as possible causes of a disturbed growth pattern. Therefore, we conclude that vitrified embryo transfer is not a neutral procedure, and it incurs long-term effects in the offspring both at phenotypic and molecular levels. These results described a striking example of the developmental plasticity exhibited by the mammalian embryo.Funding from the Ministry of Economy, Industry and Competitiveness (Research project: AGL2017-85162-C2-1-R and AGL2014-53405-C2-1-P) is acknowledged. X.G.D. was supported by a research grant from the Ministry of Economy, Industry and Competitiveness (BES-2015-072429).Garcia-Dominguez, X.; Marco-Jiménez, F.; Peñaranda, D.; Vicente Antón, JS. (2020). Long-Term Phenotypic and Proteomic Changes Following Vitrified Embryo Transfer in the Rabbit Model. Animals. 10(6):1-16. https://doi.org/10.3390/ani10061043S116106Crawford, G., & Ledger, W. (2018). In vitro fertilisation/intracytoplasmic sperm injection beyond 2020. BJOG: An International Journal of Obstetrics & Gynaecology, 126(2), 237-243. doi:10.1111/1471-0528.15526Findlay, J. K., Holland, M. K., & Wong, B. B. M. (2019). Reproductive science and the future of the planet. Reproduction, 158(3), R91-R96. doi:10.1530/rep-18-0640Vrooman, L. A., & Bartolomei, M. S. (2017). Can assisted reproductive technologies cause adult-onset disease? Evidence from human and mouse. Reproductive Toxicology, 68, 72-84. doi:10.1016/j.reprotox.2016.07.015Roseboom, T. J. (2018). Developmental plasticity and its relevance to assisted human reproduction. Human Reproduction, 33(4), 546-552. doi:10.1093/humrep/dey034Fleming, T. P., Watkins, A. J., Velazquez, M. A., Mathers, J. C., Prentice, A. M., Stephenson, J., … Godfrey, K. M. (2018). Origins of lifetime health around the time of conception: causes and consequences. The Lancet, 391(10132), 1842-1852. doi:10.1016/s0140-6736(18)30312-xFeuer, S., & Rinaudo, P. (2016). From Embryos to Adults: A DOHaD Perspective on In Vitro Fertilization and Other Assisted Reproductive Technologies. Healthcare, 4(3), 51. doi:10.3390/healthcare4030051Feuer, S. K., & Rinaudo, P. F. (2017). Physiological, metabolic and transcriptional postnatal phenotypes ofin vitrofertilization (IVF) in the mouse. Journal of Developmental Origins of Health and Disease, 8(4), 403-410. doi:10.1017/s204017441700023xDuranthon, V., & Chavatte-Palmer, P. (2018). Long term effects of ART: What do animals tell us? Molecular Reproduction and Development, 85(4), 348-368. doi:10.1002/mrd.22970Ramos‐Ibeas, P., Heras, S., Gómez‐Redondo, I., Planells, B., Fernández‐González, R., Pericuesta, E., … Gutiérrez‐Adán, A. (2019). Embryo responses to stress induced by assisted reproductive technologies. Molecular Reproduction and Development, 86(10), 1292-1306. doi:10.1002/mrd.23119Chen, M., & Heilbronn, L. K. (2017). The health outcomes of human offspring conceived by assisted reproductive technologies (ART). Journal of Developmental Origins of Health and Disease, 8(4), 388-402. doi:10.1017/s2040174417000228Novakovic, B., Lewis, S., Halliday, J., Kennedy, J., Burgner, D. P., Czajko, A., … Saffery, R. (2019). Assisted reproductive technologies are associated with limited epigenetic variation at birth that largely resolves by adulthood. Nature Communications, 10(1). doi:10.1038/s41467-019-11929-9Belva, F., Bonduelle, M., Roelants, M., Michielsen, D., Van Steirteghem, A., Verheyen, G., & Tournaye, H. (2016). Semen quality of young adult ICSI offspring: the first results. Human Reproduction, 31(12), 2811-2820. doi:10.1093/humrep/dew245Calle, A., Fernandez-Gonzalez, R., Ramos-Ibeas, P., Laguna-Barraza, R., Perez-Cerezales, S., Bermejo-Alvarez, P., … Gutierrez-Adan, A. (2012). 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Long-term and transgenerational phenotypic, transcriptional and metabolic effects in rabbit males born following vitrified embryo transfer

[EN] The advent of assisted reproductive technologies (ART) in mammals involved an extraordinary change in the environment where the beginning of a new organism takes place. Under in vitro conditions, in which ART is currently being performed, it likely fails to mimic optimal in vivo conditions. This suboptimal environment could mediate in the natural developmental trajectory of the embryo, inducing lasting effects until later life stages that may be inherited by subsequent generations (transgenerational effects). Therefore, we evaluated the potential transgenerational effects of embryo exposure to the cryopreservation-transfer procedure in a rabbit model on the offspring phenotype, molecular physiology of the liver (transcriptome and metabolome) and reproductive performance during three generations (F1, F2 and F3). The results showed that, compared to naturally-conceived animals (NC group), progeny generated after embryo exposure to the cryopreservation-transfer procedure (VT group) exhibited lower body growth, which incurred lower adult body weight in the F1 (direct effects), F2 (intergenerational effects) and F3 (transgenerational effects) generations. Furthermore, VT animals showed intergenerational effects on heart weight and transgenerational effects on liver weight. The RNA-seq data of liver tissue revealed 642 differentially expressed transcripts (DETs) in VT animals from the F1 generation. Of those, 133 were inherited from the F2 and 120 from the F3 generation. Accordingly, 151, 190 and 159 differentially accumulated metabolites (DAMs) were detected from the F1, F2 and F3, respectively. Moreover, targeted metabolomics analysis demonstrated that transgenerational effects were mostly presented in the non-polar fraction. Functional analysis of molecular data suggests weakened zinc and fatty acid metabolism across the generations, associated with alterations in a complex molecular network affecting global hepatic metabolism that could be associated with the phenotype of VT animals. However, these VT animals showed proper reproductive performance, which verified a functional health status. In conclusion, our results establish the long-term transgenerational effects following a vitrified embryo transfer procedure. We showed that the VT phenotype could be the result of the manifestation of embryonic developmental plasticity in response to the stressful conditions during ART procedures.Funding from the Ministry of Economy, Industry and Competitiveness (Research project: AGL2014-53405-C2-1-P) and Generalitat Valenciana (Research project: Prometeo II 2014/036) is acknowledged. X.G.D. was supported by a research grant from the Ministry of Economy, Industry and Competitiveness (BES-2015-072429). 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Effect of embryo vitrification on the steroid biosynthesis of liver tissue in rabbit offspring

[EN] Preimplantation embryo manipulations during standard assisted reproductive technologies (ART) have significant repercussions on offspring. However, few studies to date have investigated the potential long-term outcomes associated with the vitrification procedure. Here, we performed an experiment to unravel the particular effects related to stress induced by embryo transfer and vitrification techniques on offspring phenotype from the foetal period through to prepuberal age, using a rabbit model. In addition, the focus was extended to the liver function at prepuberal age. We showed that, compared to naturally conceived animals (NC), offspring derived after embryo exposure to the transfer procedure (FT) or cryopreservation-transfer procedure (VT) exhibited variation in growth and body weight from foetal life to prepuberal age. Strikingly, we found a nonlinear relationship between FT and VT stressors, most of which were already present in the FT animals. Furthermore, we displayed evidence of variation in liver function at prepuberal age, most of which occurred in both FT and VT animals. The present major novel finding includes a significant alteration of the steroid biosynthesis profile. In summary, here we provide that embryonic manipulation during the vitrification process is linked with embryo phenotypic adaptation detected from foetal life to prepuberal age and suggests that this phenotypic variation may be associated, to a great extent, with the effect of embryo transfer.This research was funded by Conselleria d'Educacio, Investigacio, Cultura i Esport, Spain, grant number AICO/2019/272. Ximo Garcia-Dominguez was supported by a research grant from the Ministry of Economy, Industry and Competitiveness of Spain (BES-2015-072429).Marco-Jiménez, F.; Garcia-Dominguez, X.; Domínguez-Martínez, M.; Viudes-De-Castro, MP.; Diretto, G.; Peñaranda, D.; Vicente Antón, JS. (2020). 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Dynamic Ordering and Transverse Depinning of a Driven Elastic String in a Disordered Media

We examine the dynamics of an elastic string interacting with quenched disorder driven perpendicular and parallel to the string. We show that the string is the most disordered at the depinning transition but with increasing drive partial ordering is regained. For low drives the noise power is high and we observe a 1/f^2 noise signature crossing over to a white noise character with low power at higher drives. For the parallel driven moving string there is a finite transverse critical depinning force with the depinning transition occuring by the formation of running kinks.Comment: 4 pages, 4 postscript figure

Precision Pion-Proton Elastic Differential Cross Sections at Energies Spanning the Delta Resonance

A precision measurement of absolute pi+p and pi-p elastic differential cross sections at incident pion laboratory kinetic energies from T_pi= 141.15 to 267.3 MeV is described. Data were obtained detecting the scattered pion and recoil proton in coincidence at 12 laboratory pion angles from 55 to 155 degrees for pi+p, and six angles from 60 to 155 degrees for pi-p. Single arm measurements were also obtained for pi+p energies up to 218.1 MeV, with the scattered pi+ detected at six angles from 20 to 70 degrees. A flat-walled, super-cooled liquid hydrogen target as well as solid CH2 targets were used. The data are characterized by small uncertainties, ~1-2% statistical and ~1-1.5% normalization. The reliability of the cross section results was ensured by carrying out the measurements under a variety of experimental conditions to identify and quantify the sources of instrumental uncertainty. Our lowest and highest energy data are consistent with overlapping results from TRIUMF and LAMPF. In general, the Virginia Polytechnic Institute SM95 partial wave analysis solution describes our data well, but the older Karlsruhe-Helsinki PWA solution KH80 does not.Comment: 39 pages, 22 figures (some with quality reduced to satisfy ArXiv requirements. Contact M.M. Pavan for originals). Submitted to Physical Review

Leptonic and Semileptonic Decays of Charm and Bottom Hadrons

We review the experimental measurements and theoretical descriptions of leptonic and semileptonic decays of particles containing a single heavy quark, either charm or bottom. Measurements of bottom semileptonic decays are used to determine the magnitudes of two fundamental parameters of the standard model, the Cabibbo-Kobayashi-Maskawa matrix elements $V_{cb}$ and $V_{ub}$. These parameters are connected with the physics of quark flavor and mass, and they have important implications for the breakdown of CP symmetry. To extract precise values of $|V_{cb}|$ and $|V_{ub}|$ from measurements, however, requires a good understanding of the decay dynamics. Measurements of both charm and bottom decay distributions provide information on the interactions governing these processes. The underlying weak transition in each case is relatively simple, but the strong interactions that bind the quarks into hadrons introduce complications. We also discuss new theoretical approaches, especially heavy-quark effective theory and lattice QCD, which are providing insights and predictions now being tested by experiment. An international effort at many laboratories will rapidly advance knowledge of this physics during the next decade.Comment: This review article will be published in Reviews of Modern Physics in the fall, 1995. This file contains only the abstract and the table of contents. The full 168-page document including 47 figures is available at http://charm.physics.ucsb.edu/papers/slrevtex.p

ARIA 2016: Care pathways implementing emerging technologies for predictive medicine in rhinitis and asthma across the life cycle

The Allergic Rhinitis and its Impact on Asthma (ARIA) initiative commenced during a World Health Organization workshop in 1999. The initial goals were (1) to propose a new allergic rhinitis classification, (2) to promote the concept of multi-morbidity in asthma a