Reproductive impacts of tributyltin (TBT) and triphenyltin (TPT) in the hermaphroditic freshwater gastropod Lymnaea stagnalis

in Environmental Toxicology and Chemistry (in press), 2013

Tributyltin (TBT) and triphenyltin (TPT) are emblematic endocrine disruptors, which have been mostly studied in gonochoric prosobranchs. Although both compounds can simultaneously occur in the environment ... [more ▼]

Tributyltin (TBT) and triphenyltin (TPT) are emblematic endocrine disruptors, which have been mostly studied in gonochoric prosobranchs. Although both compounds can simultaneously occur in the environment, they have mainly been tested separately for their effects on snail reproduction. Because large discrepancies in experimental conditions occurred in these tests, the present study aimed at comparing the relative toxicity of TBT and TPT under similar laboratory conditions in the 0–600 ng Sn/L range. Tests were performed on the simultaneous hermaphrodite Lymnaea stagnalis, a freshwater snail in which effects of TPT were unknown. Survival, shell length and reproduction were monitored in a 21d semi-static test. Frequency of abnormal eggs was assessed as an additional endpoint. TPT hampered survival while TBT did not. Major effects on shell solidity and reproduction were observed for both compounds, reproductive outputs being more severely hampered by TBT than by TPT. Considering the frequency of abnormal eggs allowed increasing test sensitivity, since snail responses to TBT could be detected at concentrations as low as 19 ng Sn/L. However, the putative mode of action of the two compounds could not be deduced from the structure of the molecules or from the response of apical endpoints. Sensitivity of L. stagnalis to TBT and TPT was compared to the sensitivity of prosobranch molluscs with different habitats and different reproductive strategies. [less ▲]

Introduction

in Climatic Change (in press)

Le rôle de l’usage de l’ordinateur dans le travail scolaire des apprenants : Opinions des élèves des lycées Général Leclerc et bilingue de Yaoundé (Cameroun)

in Dili Palai, clément (Ed.) Langages, Littérature et Éducation. De la poétique des savoirs endogènes aux mutations sociale (in press)

Cet article vise à cerner autrement le rôle de l’usage de l’ordinateur dans le travail scolaire des élèves. Elle utilise à cet effet une démarche centrée sur les apprenants, c’est-à-dire sur l’examen de ... [more ▼]

Cet article vise à cerner autrement le rôle de l’usage de l’ordinateur dans le travail scolaire des élèves. Elle utilise à cet effet une démarche centrée sur les apprenants, c’est-à-dire sur l’examen de leurs opinions (ce qu’ils pensent et disent) sur ce sujet. En analysant les discours tenus par les élèves des lycées Général Leclerc et bilingue de Yaoundé sur cette question, ce travail montre que pour eux, l’usage des TIC produit une réelle valeur ajoutée pédagogique. Mais ces potentialités résultent d’une combinaison de plusieurs facteurs concernant l’élève, l’enseignant et la structure scolaire. [less ▲]

The Stadium of Olympia, from a dialogical architecture perspective

in Arquitectonics: Mind, Land and Society (in press), 26

The article proposes a renewed interpretation of the relation of the antique stadium of Olympia with its environment. It is argued that the stadium, far from being isolated from the city as commonly ... [more ▼]

The article proposes a renewed interpretation of the relation of the antique stadium of Olympia with its environment. It is argued that the stadium, far from being isolated from the city as commonly admitted, was connected to the Altis through a series of visual relations, adopting principles of dialogical architecture. This argument is illustrated through computer generated perspectives of the stadium. [less ▲]

Peuple(s) et subjectivations politiques chez Claude Lefort: une lecture du "Machiavel

in Tumultes (in press)

Climate and Security: Evidence, Emerging Risks and a New Agenda

in Climatic Change (in press)

Host-habitat location by the parasitoid, Nasonia vitripennis Walker (Hymenoptera: Pteromalidae).

in Journal of Forensic Sciences (in press)

This study investigated the role of odorant cues used during host-habitat location by the generalist parasitoid, Nasonia vitripennis Walker. N vitripennis is a common parasitoid of Dipteran pupae found in ... [more ▼]

This study investigated the role of odorant cues used during host-habitat location by the generalist parasitoid, Nasonia vitripennis Walker. N vitripennis is a common parasitoid of Dipteran pupae found in association with decaying carrion. Behavioral assays were used to investigate the host-habitat searching behavior under different scenarios. First, we demonstrated N. vitripennis to be significantly attracted toward odorant cues associated with decaying meat. The biological activity of nine of the volatile molecules constituting the odor of decaying meat were tested on the searching behavior of parasitoid females through two complementary chemoecological approaches: electronantennography (EAG) and olfactometry bioassays. Butanoic acid and butan-1-ol elicited high olfactory responses, but no attraction was induced by these two chemicals. Behavioral assays showed that, among the VOCs tested, methyldisulfanylmethane (DMDS) was the only volatile chemical to induce attraction in N. vitripennis. [less ▲]

The ideology of the British National Party

in Revue LISA : Littératures, Histoire des Idées, Images, Sociétés du Monde Anglophone = LISA e-Journal (in press)

"Gebilde, so nichtig wie Träume von Kranken". E.T.A. Hoffmanns Nachtstück "Ignaz Denner" als poetologische Erzählung

in E.T.A. Hoffmann-Jahrbuch (in press), 21

Cognitive support for a better handoff: does it improve the quality of medical communication at shift change in an emergency department?

in European Journal of Emergency Medicine (in press)

In order to improve the communication during shift handover in an emergency department, we observed the handover process and analysed the discourse between physicians at shift change first, then we ... [more ▼]

In order to improve the communication during shift handover in an emergency department, we observed the handover process and analysed the discourse between physicians at shift change first, then we created two cognitive tools and tested their clinical impact on the field. We used different measures to evaluate this impact on the health care process including frequency and type of information content communicated between physicians, duration of the handoff, physician self-evaluation of the quality of the handoff and a post-handover study of patient handling. Our results showed that the patient's medical history, significant tests results, recommendations (treatment plan) and patient follow-up were communicated to a greater extent when the tools are used. We also demonstrated that physicians spent more time at the bedside and less time consulting medical records using these tools. [less ▲]