Dysmenorrhea among 12-year-old teenagers from different socioeconomic backgrounds.

Background: The age of menarche has been gradually declining since the end of the 20th century. Few studies have been carried out about dysmenorrhea in Europe and they mainly included girls over the age of 15 years.

Methods: We conducted an observational study among sixth-grade schoolgirls (usually 11-12 years) during the 2020 academic year in 72 randomly selected public schools in a French region (approval number #20.

Synthesis of γ-Lactams by Formal Cycloadditions with Ketenes.

The synthesis of γ-lactams is reported by a formal (3+2) cycloaddition between readily available ketenes and aziridines or a one-pot formal (2+1+2) cycloaddition using imines as aziridine precursors. The method is practical, is scalable, and affords high yields. It also offers a high level of regio- and diastereoselectivity on a wide range of substrates as well as a high stereoselectivity in the case of enantiopure aziridines.

Stories of contemporary aging: An analysis of "lived" citizenship in later life.

The new political economy of aging portrays "active citizenship" among seniors as a key challenge for the years to come. As a policy framework, Active Aging ranks high on the agendas of most supranational bodies. Informed by discourse analysis and a narrative approach, this article focuses on, first, older women's everyday "active" practices, their meaning, and purpose and second, their day-to-day practical citizenship and social engagement experiences.

[Meaning and practice of grandmotherhood: a theoretical study based on older women in Quebec].

This article sets out to analyze how older women understand grandmotherhood. In-depth interviews were conducted with 25 elderly women from Quebec with diverse lives (widowed, married, single, with or without children) drawn from three generations (65-74 years, 75-84 years, 85 years and over) according to principles of qualitative analysis using grounded theory. Based on a constructivist approach, results highlight the evolution of images of grandmotherhood offering the benefit of emotional, playful and comforting roles.

Expression of the RND-type efflux pump AdeABC in Acinetobacter baumannii is regulated by the AdeRS two-component system.

The AdeABC pump of Acinetobacter baumannii BM4454, which confers resistance to various antibiotic classes including aminoglycosides, is composed of the AdeA, AdeB, and AdeC proteins; AdeB is a member of the RND superfamily. The adeA, adeB, and adeC genes are contiguous and adjacent to adeS and adeR, which are transcribed in the opposite direction and which specify proteins homologous to sensors and regulators of two-component systems, respectively (S. Magnet, P.