Zobrazení zdroje stránky Melchiorseneliasen9764

Importantly, the liver transcriptome of Per1,2-/- mice also showed ultradian rhythms, corresponding to pAKT rhythmicity and consisting of AKT-related genes and regulators. Overall, our findings reveal ultradian rhythms in liver gene expression and AKT phosphorylation that emerge in the absence of environmental rhythms and Per1,2-/- genes.Retinal direction-selectivity originates in starburst amacrine cells (SACs), which display a centrifugal preference, responding with greater depolarization to a stimulus expanding from soma to dendrites than to a collapsing stimulus. Various mechanisms were hypothesized to underlie SAC centrifugal preference, but dissociating them is experimentally challenging and the mechanisms remain debatable. [https://www.selleckchem.com/Wnt.html Wnt inhibitor] To address this issue, we developed the Retinal Stimulation Modeling Environment (RSME), a multifaceted data-driven retinal model that encompasses detailed neuronal morphology and biophysical properties, retina-tailored connectivity scheme and visual input. Using a genetic algorithm, we demonstrated that spatiotemporally diverse excitatory inputs-sustained in the proximal and transient in the distal processes-are sufficient to generate experimentally validated centrifugal preference in a single SAC. Reversing these input kinetics did not produce any centrifugal-preferring SAC. We then explored the contribution of SAC-SAC inhibitory connections in establishing the centrifugal preference. SAC inhibitory network enhanced the centrifugal preference, but failed to generate it in its absence. Embedding a direction selective ganglion cell (DSGC) in a SAC network showed that the known SAC-DSGC asymmetric connectivity by itself produces direction selectivity. Still, this selectivity is sharpened in a centrifugal-preferring SAC network. Finally, we use RSME to demonstrate the contribution of SAC-SAC inhibitory connections in mediating direction selectivity and recapitulate recent experimental findings. Thus, using RSME, we obtained a mechanistic understanding of SACs' centrifugal preference and its contribution to direction selectivity.Identification of cell phenotypic states within heterogeneous populations, along with elucidation of their switching dynamics, is a central challenge in modern biology. Conventional single-cell analysis methods typically provide only indirect, static phenotypic readouts. Transmitted light images, on the other hand, provide direct morphological readouts and can be acquired over time to provide a rich data source for dynamic cell phenotypic state identification. Here, we describe an end-to-end deep learning platform, UPSIDE (Unsupervised Phenotypic State IDEntification), for discovering cell states and their dynamics from transmitted light movies. UPSIDE uses the variational auto-encoder architecture to learn latent cell representations, which are then clustered for state identification, decoded for feature interpretation, and linked across movie frames for transition rate inference. Using UPSIDE, we identified distinct blood cell types in a heterogeneous dataset. We then analyzed movies of patient-derived acute myeloid leukemia cells, from which we identified stem-cell associated morphological states as well as the transition rates to and from these states. UPSIDE opens up the use of transmitted light movies for systematic exploration of cell state heterogeneity and dynamics in biology and medicine.Assemblies of neurons, called concepts cells, encode acquired concepts in human Medial Temporal Lobe. Those concept cells that are shared between two assemblies have been hypothesized to encode associations between concepts. Here we test this hypothesis in a computational model of attractor neural networks. We find that for concepts encoded in sparse neural assemblies there is a minimal fraction cmin of neurons shared between assemblies below which associations cannot be reliably implemented; and a maximal fraction cmax of shared neurons above which single concepts can no longer be retrieved. In the presence of a periodically modulated background signal, such as hippocampal oscillations, recall takes the form of association chains reminiscent of those postulated by theories of free recall of words. Predictions of an iterative overlap-generating model match experimental data on the number of concepts to which a neuron responds.This study aimed to determine the rates of overall survival and recurrence-free survival among elderly Taiwanese women (&gt;65 years old) according to breast cancer subtype and lymph node status. We identified 554 eligible patients who were &gt;65 years old and had been treated based on international recommendations at our center between June 2005 and June 2015. Patients with the luminal A subtype had the highest rates of overall survival (90.6%) and recurrence-free survival (97.0%), while the lowest overall survival rate was observed in those with the triple-negative subtype (81.3%) and the lowest recurrence-free survival rate was observed in those with the luminal B subtype (84.0%). Multivariate Cox proportional hazard analysis, using the luminal A subtype as the reference, revealed significant differences in recurrence-free survival among luminal B patients according to lymph node status. Among elderly Taiwanese women with breast cancer, the breast cancer subtype might help predict survival outcomes. The luminal B subtype was associated with poor recurrence-free survival, and lymph node status was useful for predicting recurrence-free survival in this subset of patients.<br /><br /> La pandemia de enfermedad por coronavirus 2019 (COVID-19) ha incidido de forma negativa en los programas de rehabilitación cardiaca (PRC) españoles.<br /><br /> Este trabajo tiene como objetivo fundamental el analizar la posibilidad de mantenerlos abiertos y como secundario valorar si se mantienen los beneficios demostrados a nivel físico y psicológico.<br /><br /> Analizamos los resultados de nuestro PRC en el año 2020 (119 pacientes) y los comparamos con los del año 2019 (121 pacientes), libre de COVID-19. Se comparan distintas variables generales, y los resultados obtenidos en capacidad física, a nivel psicológico, así como las complicaciones y abandonos.<br /><br /> No existen diferencias significativas entre ambos grupos en la edad (61.6 vs. 61.5), sexo (mujeres 12.6 vs. 14.8%), diagnóstico de cardiopatía isquémica (106 vs. 99) y fracción de eyección de ventrículo izquierdo (55.9 vs. 55.8%). La ansiedad media-alta fue superior al inicio (p = 0.02) y final (p = 0.002) del programa en el año 2019, así como las puntuaciones del patrón continue to show benefits. The duration of programme was longer due to periods of non-attendance. Lower physical capacity may be related to mask use.<br /><br /> Determinar la percepción de los médicos internos residentes (MIR) de cardiología de España sobre el efecto de la pandemia por COVID-19 en su formación y la adaptación realizada por sus servicios.<br /><br /> Estudio de corte transversal a través de una plataforma de encuesta digital con el objetivo de conocer la opinión individual de los MIR de cardiología sobre la influencia de la pandemia en su formación. Se realiza un análisis estadístico para determinar los factores que influyeron en la percepción de la formación afectada.<br /><br /> Participó un total de 180 MIR de las 17 comunidades autónomas (CA). Los MIR de tercer año fueron los más afectados, junto con los que rotaban en imagen cardíaca. Los residentes de las CA con una prevalencia &gt;5 casos/1,000 habitantes fueron los que mayor probabilidad tuvieron de ser desplazados de sus servicios.<br /><br /> Según la opinión de los participantes, el efecto de la pandemia por COVID-19 en su formación fue más negativa en los residentes de tercer año y los que rotaban en imagen cardíaca.e impact of the COVID-19 pandemic on their academic training was more negative in third year FITs and those rotating in cardiac imaging.La pandemia de COVID-19 ha infligido grandes estragos a la población y en especial al personal de salud. Los esfuerzos de reanimación exigen modificaciones potenciales de las guías internacionales existentes de reanimación cardiopulmonar (RCP) debido al elevado índice de contagiosidad del virus SARS-CoV-2. Se considera que hasta 15% de los casos de COVID-19 tiene una enfermedad grave y 5% padece un trastorno crítico con una mortalidad promedio del 3%, la cual varía según sean el país y las características de los pacientes. La edad y las comorbilidades como la hipertensión arterial, enfermedad cardiovascular, obesidad y diabetes incrementan la mortalidad hasta 24%. También se ha informado un aumento reciente del número de casos de paro cardíaco extrahospitalario (PCEH). Aunque el paro cardíaco (PC) puede ser efecto de factores diversos en estos pacientes, en la mayoría de los casos se ha demostrado que el origen es respiratorio, con muy pocos casos de causa cardíaca. Se debe considerar la indicación de iniciar-hospital cardiopulmonary arrest (OHCA) victims. Cardiac arrest (CA) in these subjects might be related to many causes, but apparently, that phenomenon is related to respiratory diseases rather than cardiac issues. In this context, the decision to start or continue CPR maneuvers has to be carefully assessed, because of the low survival rate reported so far and the high contagion risk among healthcare personnel.<br /><br /> COVID-19 pandemic is associated with high incidence and fatality, however, non-communicable diseases remain a global public health problem with even greater morbidity and mortality. At present, there is a lag in diagnosis and treatment of patients with heart disease, particularly the performance of exercise testing (ET), due to the fear of aerosol generation and viral dissemination. Although some centers carry out the tests with the use of masks, the information is still superficial and preliminary. The objective of the study was to describe the ergometric performance observed when performing exercise tests during the COVID-19 (PANDEMIC-G) pandemic and to highlight the differences with those results carried out in another time, when there was no COVID-19 (NO PANDEMIC).<br /><br /> A cross-sectional study was carried out. PANDEMIC-G patients underwent ET between March 2020 and December 2020, once a biological triage was done and all of them wore N95 masks. They were compared to NO PANDEMIC patients that performed an ET between March 2019 and December 2019. Demographic and ergometric variables were presented and analyzed according to their type. All p &lt; 0.05 were considered stochastically significant.<br /><br /> A total of 361 ET were studied 209 (58%) belonged to NO PANDEMIC and 152 (42%) to PANDEMIC-G. The number of ET stopped by dyspnea was greater in PANDEMIC-G (117) than in NO PANDEMIC (8). Exercise tolerance did not show significant changes. Systolic blood pressure, double product, and myocardial oxygen utilization were higher in PANDEMIC-G ET (p &lt; 0.01).<br /><br /> In the COVID-era, fewer stress tests were performed, which were suspended more frequently due to dyspnea. Higher values of systolic blood pressure and myocardial oxygen utilization were observed in PANDEMIC-G as well.<br /><br />In the COVID-era, fewer stress tests were performed, which were suspended more frequently due to dyspnea. Higher values of systolic blood pressure and myocardial oxygen utilization were observed in PANDEMIC-G as well.