Search results for "pathos"

From the roots to the stem: unveiling pear root colonization and infection pathways by Erwinia amylovora

2020

ABSTRACT Fire blight caused by Erwinia amylovora affects pome fruit worldwide, generating serious economic losses. Despite the abundant literature on E. amylovora infection mechanisms of aerial plant organs, root infection routes remain virtually unexplored. Assessing these infection pathways is necessary for a full understanding of the pathogen's ecology. Using the pathosystem Pyrus communis–E. amylovora and different experimental approaches including a green fluorescent protein transformant (GFP1) and epifluorescence microscopy (EFM) and laser confocal scanning microscopy (LCSM), we demonstrated the pathogen's ability to infect, colonize and invade pear roots and cause characteristic fire…

Local adaptation of plant viruses: lessons from experimental evolution.

2016

[EN] For multihost pathogens, adaptation to multiple hosts has important implications for both applied and basic research. At the applied level, it is one of the main factors determining the probability and severity of emerging disease outbreaks. At the basic level, it is thought to be a key mechanism for the maintenance of genetic diversity both in host and pathogen species. In recent years, a number of evolution experiments have assessed the fate of plant virus populations replicating within and adapting to one single or to multiple hosts species. A first group of these experiments tackled the existence of trade-offs in fitness and virulence for viruses evolving either within a single hos…

Stimulation of Defense Reactions in Medicago truncatula by Antagonistic Lipopeptides from Paenibacillus sp. Strain B2

2010

ABSTRACT With the aim of obtaining new strategies to control plant diseases, we investigated the ability of antagonistic lipopolypeptides (paenimyxin) from Paenibacillus sp. strain B2 to elicit hydrogen peroxide (H 2 O 2 ) production and several defense-related genes in the model legume Medicago truncatula . For this purpose, M. truncatula cell suspensions were used and a pathosystem between M. truncatula and Fusarium acuminatum was established. In M. truncatula cell cultures, the induction of H 2 O 2 reached a maximum 20 min after elicitation with paenimyxin, whereas concentrations higher than 20 μM inhibited H 2 O 2 induction and this was correlated with a lethal effect. In plant roots in…

Are grapevine stomata involved in the elicitor-induced protection against downy mildew?

2009

Stomata, natural pores bordered by guard cells, regulate transpiration and gas exchanges between plant leaves and the atmosphere. These natural openings also constitute a way of penetration for microorganisms. In plants, the perception of potentially pathogenic microorganisms or elicitors of defense reactions induces a cascade of events, including H2O2 production, that allows the activation of defense genes, leading to defense reactions. Similar signaling events occur in guard cells in response to the perception of abscisic acid (ABA), leading to stomatal closure. Moreover, few elicitors were reported to induce stomatal closure in Arabidopsis and Vicia faba leaves. Because responses to ABA…

Association of Toll-like receptors 2, 3, and 4 genes polymorphisms with periapical pathosis risk

2016

Background: The aim of this study was to investigate the role of gene variations of Toll-like receptors (TLR) 2, 3, and 4 on genetic susceptibility to periapical pathosis. Material and Methods: One hundred patients were included in the study and divided into two groups as follows; Control Group (n=50) that have root canal treatment and no periapical lesion, Patient Group (n=50) that have root canal treatment and periapical lesion. TLR2 Arg753Gln, TLR3 (c.1377C/T) and TLR4 Asp299Gly and Thr399Ile polymorphisms were genotyped by using PCR-RFLP. Genotypical analysis of control and patient groups were investigated to disclose whether there is any association between periapical lesions and gene …

Fantasmi dell'isteria nella danza contemporanea

2008

Convencer mirando a cámara: el minuto de oro de los debates electorales como refugio de condensación retórica

2021

This paper studies the final statements (“golden minutes”) of televised electoral debates in Spain between 1993 and 2019. The methodology is adjusted to the cognitive analysis of discourse, analyzing three pragmatic indicators that could reveal an evolution in three stages of Spanish politics: the bipartisan phase (1993-2011), an adjustment phase (2011-2015) and a multiparty phase (2015- 2019). The discursive spaces dependent on the predicative strategy, the predominant illocutionary force, and the use of superstructures are analyzed. It is concluded that, for the three phases, the variables referring to the use of enunciative persons (which points to the introduction of the ethos of discou…

La dimensión hermenéutica de la afectividad en las primeras lecciones de Martin Heidegger

2018

Este trabajo se centra en el papel que juega la afectividad en la conocida como transformación hermenéutica de la fenomenología llevada a cabo por el joven Martin Heidegger. Tras establecer en la introducción la estrecha vinculación que existe entre la afectividad y la facticidad, tomo como hilo conductor la noción de movilidad (Bewegtheit) de la vida fáctica. En un primer momento explico la peculiar significación que adquiere este término en la filosofía del joven Heidegger. En segundo lugar me detengo a analizar la doble “movilidad fundamental” (Grundbewegtheit) del amor y el odio como la matriz intencional del curare (Bekümmerung) en la interpretación heideggeriana de las Confesiones de …

Digital Picklock for Video Art Exgesis: Reflections, Conditions and Possible Employment of Distant Viewing to Moving Image Datasets in Visual Arts Sc…

2021

With the advent of digital humanities new expectations and challenges are emerging for institutions harbouring video artworks, specifically in offering access and analytical tools to their archival collections. The paper argues for the possible employment of distant viewing to allow visual arts scholars an unprecedented take on video art, holding together both quantitative comparison and aesthetic considerations. In doing so, the paper addresses the peculiar conditions of video art that need proper consideration for a fruitful employment of distant viewing. Set on the background of the existing platforms for video-art consumption ���such as UBU Network, JSC Media Centre, and Daata Streaming…

Rhetoric and Pragmatics: Suggestions for a Fruitful Dialogue

2013

The aim of this paper is to show that classical rhetoric can provide valuable insights in the contemporary debate in pragmatics. This is especially true for Aristotelian rhetoric, due to its philosophical approach. In the first part of the paper, I discusses the conditions under which ancient rhetoric can be a real partner of current pragmatics: (1) rhetoric must be understood as a type of knowledge (a techne) and not as a “jumbles of techniques”; (2) we need to consider persuasion as an anthropological feature and not only as a specific case of communication; (3) we should not exclude truth from the rhetorical field. The second part of the paper focuses on what can be considered the basic …