Search results for "SELE"

Sex-specific effects of natural and sexual selection on the evolution of life span and ageing in Drosophila simulans

2014

Summary Variation in the strength of age-dependent natural selection shapes differences in ageing rates across species and populations. Likewise, sexual selection can promote divergent patterns of senescence across the sexes. However, the effects of these processes on the evolution of ageing have largely been considered independently, and interactions between them are poorly understood. We use experimental evolution to investigate how natural and sexual selection affect life span and ageing in Drosophila simulans. Replicate populations were evolved under lifetime monogamy (relaxed sexual selection) or lifetime polyandry (elevated sexual selection) and at one of two temperatures, 25 °C (rela…

Leaps and bounds : towards an integrative theory of cultural evolution

2014

Tutkimuksessa pyritään yhdistämään ajatus kulttuurista eräänlaisen luonnonvalinnan alaisena Dan Sperberin näkemyksien (1) kommunikaation taustadynamiikasta tarkoitet-tujen merkityksien päättelynä niiden kontekstisidonnaisen merkittävyyden perusteella ja (2) erilaisten käsityksien eri kohteista leviämisen suhteen. Tällaisen yhdentävän viiteke-hyksen turvin pyritään vastaamaan pätevästi Sperberin kritiikkiin koskien darwinilaisen luonnonvalinnan soveltamista kulttuurin ilmiöihin. Näihin kritiikkeihin lukeutuvat väitteet, että (1) kulttuurin muutostiheys on liian korkea evoluution tuloksien kasautumisen mahdol-listamiseksi, (2) yleistykset koskien sisältöjä ovat kestämättömiä tehtyjen yliyksin…

Endofenotipos neurocognitivos potenciales para el trastorno bipolar: velocidad motora manual, memoria visual, velocidad de procesamiento

2017

Antecedentes: Son pocas las investigaciones que se centran en el estudio de las disfunciones neurocognitivas en pacientes con trastorno bipolar (TB) como posibles marcadores de rasgo para esta enfermedad, menos aún son las que comparan el rendimiento motor, la memoria visual o la velocidad de procesamiento de la información, en estudios transversales o longitudinales, incluyendo a la vez, controles (CS) y familiares sanos de primer grado de los pacientes (TB-F); hasta la redacción de esta tesis, aunque el número va en aumento, en la investigación psiquiátrica el trastorno bipolar sigue ocupando un lugar secundario frente a la esquizofrenia, siendo insuficientes los estudios que buscan evide…

Chronic Mesenteric Ischemia: Critical review and guidelines for management

2011

Background CMI is caused by chronic occlusive disease of mesenteric arteries. In such an uncommon disease, clear recommendations are strongly needed. Unfortunately, treatment options for symptomatic CMI are still controversial and no guidelines exist. Methods A systematic literature review of the last 25-years was conducted through MEDLINE, Embase, and Cochrane Review/Trials register to identify studies reporting on CMI treatment with more than 10 patients. Primary outcomes were perioperative mortality and morbidity rates. Secondary outcomes were survival rates, primary and secondary patency rates, vessels treated, CMI recurrence, follow-up (FU), technical success (TS), and in-hospital leng…

From 1D coordination polymers to Metal Organic Frameworks by the use of 2-pyridyl oximes.

2020

The synthesis and characterization of coordination polymers and metal&ndash

Soil microbial community response to a selenium chronic exposure

2007

International audience

Effects of microclimate on nest site selection and breeding success of lesser kestrel Falco naumanni in the Gela Plain (Sicily)

2013

Estudio del contenido y del estado mitocondrial en el blastocisto humano

2022

El contenido de ácido desoxirribonucleico (ADN) mitocondrial (ADNmt) por célula como marcador de viabilidad embrionaria se propuso como una estrategia muy innovadora para la priorización en la selección de embriones humanos en los tratamientos reproducción asistida, siendo los embriones con menor contenido mitocondrial por célula los candidatos a ser transferidos. La hipótesis de partida se basaba en que dichos embriones presentarían un estado metabólico más apropiado y un menor estrés celular, los cuales se traducirían en una mayor probabilidad de implantación. La elevada expectación inicialmente generada alrededor de este marcador, vino acompañada de publicaciones con resultados contradic…

Ecologists overestimate the importance of predictor variables in model averaging: a plea for cautious interpretations.

2014

Abstract: Information-theory procedures are powerful tools for multimodel inference and are now standard methods in ecology. When performing model averaging on a given set of models, the importance of a predictor variable is commonly estimated by summing the weights of models where the variable appears, the so-called sum of weights (SW). However, SWs have received little methodological attention and are frequently misinterpreted. We assessed the reliability of SW by performing model selection and averaging on simulated data sets including variables strongly and weakly correlated to the response variable and a variable unrelated to the response. Our aim was to investigate how useful SWs are …

Model selection procedure for mixture hidden Markov models

2021

This paper proposes a model selection procedure to identify the number of clusters and hidden states in discrete Mixture Hidden Markov models (MHMMs). The model selection is based on a step-wise approach that uses, as score, information criteria and an entropy criterion. By means of a simulation study, we show that our procedure performs better than classical model selection methods in identifying the correct number of clusters and hidden states or an approximation of them