in this paper, we investigate various kinds of extensions of twin-good rings. moreover, we prove that every element of an abelian neat ring r is twin-good if and only if r has no factor ring isomorphic to z2  or z3. the main result of [24] states some conditions that any right self-injective ring r is twin-good. we extend this result to any regular baer ring r by proving that every element of a...

An Ohm–Rush algebra $$R \rightarrow S$$ is called McCoy if for any zero-divisor f in S, its content c(f) has nonzero annihilator R, because proved this when $$S=R[x]$$ . We answer a question of Nasehpour by giving class examples faithfully flat algebras with the property that are not weak algebras. However, we show iff $$R/I S/I all radical (resp. prime) ideals I R. When R Noetherian (or more g...

An in vitro model of persistent infection of mouse fibroblasts (McCoy cells) with a trachoma strain (G17) of Chlamydia trachomatis has been developed. Persistently infected cultures were established by infecting McCoy cells with high multiplicities of chlamydiae. After the first cycle of chlamydial replication, the host cells multiplied more rapidly than the parasites, so that the fraction of i...

ive Summarization of Line Graphs from Popular Media Charles Greenbacker, Peng Wu, Sandra Carberry, Kathleen McCoy and Stephanie Elzer . . . . . . 41 Extractive Multi-Document Summaries Should Explicitly Not Contain Document Specific Content Rebecca Mason and Eugene Charniak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Daniel Low-Beer and colleagues provide a response from The Global Fund on the PLOS Medicine article by David McCoy and colleagues critiquing their lives saved assessment models. Please see later in the article for the Editors' Summary.

OBJECTIVES To evaluate the possible effect of androgen status on sexuality and mental wellbeing in patients with primary Sjögren's syndrome (pSS). METHODS Serum levels of dehydroepiandrosterone sulphate (DHEA-S), testosterone (T), androstenedione, sex hormone binding globulin (SHBG), and the SHBG/T ratio were measured in 21 women with pSS. Sexual life was assessed by a Swedish version of the ...

In vitro studies of obligate intracellular chlamydia biology and pathogenesis are highly dependent on the use of experimental models and growth conditions that mimic the mucosal architecture and environment these pathogens encounter during natural infections. In this study, the growth of Chlamydia trachomatis genital serovar E was monitored in mouse fibroblast McCoy cells and compared to more r...

In their recent longitudinal study of youth victimization and consequent traumatization, S. Boney-McCoy and D. Finkelhor (1996) contrast their position with previous retrospective research (S. Harter, P. Alexander, & R. A. Neimeyer, 1988; M. R. Nash, T. C. Hulsey, M. C. Sexton, T. L. Harralson, & W. Lambert, 1993a), arguing that their data support the impact of victimization per se, independent...