Why it is time to look beyond algal genes in photosynthetic slugs

Eukaryotic organelles depend on nuclear genes to perpetuate their biochemical integrity. This is true for mitochondria in all eukaryotes and plastids in plants and algae. Then how do kleptoplasts, plastids that are sequestered by some sacoglossan sea slugs, survive in the animals' digestive gland cells in the absence of the algal nucleus encoding the vast majority of organellar proteins? For almost two decades, lateral gene transfer (LGT) from algae to slugs appeared to offer a solution, but RNA-seq analysis, later supported by genome sequencing of slug DNA, failed to find any evidence for such LGT events. Yet, isolated reports continue to be published and are readily discussed by the popular press and social media, making the data on LGT and its support for kleptoplast longevity appear controversial. However, when we take a sober look at the methods used, we realize that caution is warranted in how the results are interpreted. There is no evidence that the evolution of kleptoplasty in sea slugs involves LGT events. Based on what we know about photosystem maintenance in embryophyte plastids, we assume kleptoplasts depend on nuclear genes. However, studies have shown that some isolated algal plastids are, by nature, more robust than those of land plants. The evolution of kleptoplasty in green sea slugs involves many promising and unexplored phenomena, but there is no evidence that any of these require the expression of slug genes of algal origin

The Fictional Character of Pornography

We refine a line of feminist criticism of pornography that focuses on pornographic works' pernicious effects. A.W. Eaton argues that inegalitarian pornography should be criticized because it is responsible for its consumers’ adoption of inegalitarian attitudes toward sex in the same way that other fictions are responsible for changes in their consumers’ attitudes. We argue that her argument can be improved with the recognition that different fictions can have different modes of persuasion. This is true of film and television: a satirical movie such as Dr. Strangelove does not morally educate in the same way as a realistic series such as The Wire. We argue that this is also true of pornography: inegalitarian depictions of sex are not invariably responsible for consumers' adoption of inegalitarian attitudes toward sex in reality. Given that pornographic works of different genres may harm in different ways, different feminist criticisms are appropriate for different genres of pornography

On Peer Influences to Get Drunk: A Panel Study of Young Adolescents

Two cohorts of students (N = 1,297) were followed annually from sixth through eighth grade to determine: {al temporal relationships among susceptibility to peer influence to misbehave, perceived exposure to peer drinking, and alcohol overindulgence; (b) cohort and gender differences in these relationships; and (el moderating influences of susceptibility on the exposure-overindulgence relationship. Seven alternative models were compared using USREL. In the accepted total sample model, susceptibility contributed to increased exposure and overindulgence, and exposure contributed to increased overindulgence. Based on subgroup analyses, this model was generally invariant across cohort and gender, and the exposureoverindulgence relationship varied as a function of initial susceptibility. Findings suggest that early peer influences on drinking originate wiLh selection, which then contributes to differential socialization