Search results for "54"

Context dependent variation in corticosterone and phenotypic divergence of Rana arvalis populations along an acidification gradient

2022

Background Physiological processes, as immediate responses to the environment, are important mechanisms of phenotypic plasticity and can influence evolution at ecological time scales. In stressful environments, physiological stress responses of individuals are initiated and integrated via the release of hormones, such as corticosterone (CORT). In vertebrates, CORT influences energy metabolism and resource allocation to multiple fitness traits (e.g. growth and morphology) and can be an important mediator of rapid adaptation to environmental stress, such as acidification. The moor frog, Rana arvalis, shows adaptive divergence in larval life-histories and predator defense traits along an acidi…

Idiosyncratic responses to simulated herbivory by root fungal symbionts in a subarctic meadow

2021

Plant-associated fungi have elementary roles in ecosystem productivity. There is little information on the interactions between arbuscular mycorrhizal (AM) fungal symbiosis, fine endophytic (FE) and dark septate endophytic (DSE) fungi, and their host plants in cold climate systems. In particular, the environmental filters potentially driving the relative abundance of these root symbionts remain unknown. We investigated the interlinkage of plant and belowground fungal responses to simulated herbivory (clipping, fertilization, and trampling) in a subarctic meadow system. AM and FE frequency in the two target plant roots, Potentilla crantzii and Saussurea alpina, was unaffected by simulated he…

Toward Comprehensive Plant Microbiome Research

2020

Microbes have driven eco-evolutionary adaptations organizing biodiversity from the origin of life. They are ubiquitous and abundant, facilitating the biochemical processes that make Earth habitable and shape ecosystem structures, functions, and services. Recent studies reveal that commensalistic and beneficial microbes associated with wild and domesticated plants may aid in establishing sustainable agriculture for a changing climate. However, developing microbe-based biotechnologies and ecosystem services requires a thorough understanding of the diversity and complexity of microbial interactions with each other and with higher organisms. We discuss the hot and blind spots in contemporary re…

Estrogen Receptor and Vascular Aging.

2021

Cardiovascular diseases remain an age-related pathology in both men and women. These pathologies are 3-fold more frequent in men than in women before menopause, although this difference progressively decreases after menopause. The vasculoprotective role of estrogens are well established before menopause, but the consequences of their abrupt decline on the cardiovascular risk at menopause remain debated. In this review, we will attempt to summarize the main clinical and experimental studies reporting the protective effects of estrogens against cardiovascular diseases, with a particular focus on atherosclerosis, and the impact of aging and estrogen deprivation on their endothelial actions. Th…

Human Enterovirus Group B Viruses Rely on Vimentin Dynamics for Efficient Processing of Viral Nonstructural Proteins.

2019

A virus needs the host cell in order to replicate and produce new progeny viruses. For this, the virus takes over the host cell and modifies it to become a factory for viral proteins. Irrespective of the specific virus family, these proteins can be divided into structural and nonstructural proteins. Structural proteins are the building blocks for the new progeny virions, whereas the nonstructural proteins orchestrate the takeover of the host cell and its functions. Here, we have shown a mechanism that viruses exploit in order to regulate the host cell. We show that viral protein synthesis induces vimentin cages, which promote production of specific viral proteins that eventually control apo…

Transposiciones de eudesmanos dirigidas por silicio. Aplicación a la síntesis de eremofilanos y sesquiterpenos espiránicos

2002

"TRANSPOSICIONES DE EUDESMANOS DIRIGIDAS POR SILICIO. APLICACIÓN A LA SÍNTESIS DE EREMOFILANOS Y SESQUITERPENOS ESPIRÁNICOS." La tesis plantea la posibilidad de desarrollar un método que permita acceder de manera sistemática a la obtención de compuestos con esqueleto carbonado de tipo eremofilano o espiro[4.5]decano a partir de la transposición de trialquilsililepoxieudesmanos, en los cuales el grupo trialquilsililo ejerce un efecto director que determina el grupo que migra en la transposición gracias a la capacidad que posee el enlace carbono-silicio de estabilizar un carbocatión en la posición b (efecto b) y de eliminar con facilidad para dar un doble enlace, evitando que se produzcan rea…

Tutela antidiscriminatoria: el principio de igualdad y el derecho a la no discriminación por razón de sexo en las relaciones laborales

2016

The perceptions of parents of children with cancer about changes in family relations

2012

Objetivos: conocer cómo perciben los padres los cambios producidos en las relaciones familiares debidos a un cáncer pediátrico. Método: Se ha utilizado una metodología de investigación grupal (grupos de autoayuda) y cualitativa (análisis del discurso de los participantes en las sesiones grupales). La muestra la constituyen 22 madres/padres cuyos hijos hace más de dos años que han contraído la enfermedad. Las sesiones grupales se realizaron en la sede de ASPANION (Asociación de padres de niños oncológicos de la Comunidad Valenciana) en Valencia. Resultados: Se constata cómo la enfermedad cambia las relaciones: – Con la pareja: redistribución de roles, diferentes formas de reaccionar y de asu…

Social Media Marketing Efforts of Luxury Brands on Instagram

2019

Social media offers marketers a broad set of instruments to connect to targeted customers in a personalized and interactive manner. Different social media platforms enable different innovative strategies for an organization’s social media presence. In this framework, Instagram has become a popular social media platform for luxury fashion brands. This paper explores the area of luxury fashion brands on Instagram by focusing on key practices that should be implemented in a social media marketing strategy. The main objectives of this study are: (1) the present the concept of luxury brands, (2) to examine the social media marketing of luxury brands aimed at driving consumer engagement, (3) to a…

Pre- and Postnatal Predator Cues Shape Offspring Anti-predatory Behavior Similarly in the Bank Vole

2021

Prey animals can assess the risks predators present in different ways. For example, direct cues produced by predators can be used, but also signals produced by prey conspecifics that have engaged in non-lethal predator-prey interactions. These non-lethal interactions can thereby affect the physiology, behavior, and survival of prey individuals, and may affect offspring performance through maternal effects. We investigated how timing of exposure to predation-related cues during early development affects offspring behavior after weaning. Females in the laboratory were exposed during pregnancy or lactation to one of three odor treatments: (1) predator odor (PO) originating from their most comm…