Sex differences in insect immune function : a consequence of diet choice?

Males often have reduced immune function compared to females but the proximate mechanisms underlying this taxonomically widespread pattern are unclear. Because immune function is resource-dependent and sexes may have different nutritional requirements, we hypothesized that sexual dimorphism in immune function may arise from differential nutrient intake (acquisition hypothesis). To test this hypothesis, we examined patterns of phenoloxidase (PO) activity in relation to nutrient consumption in Queensland fruit flies (Q-flies). In the first experiment, flies were allowed to choose their preferred nutrient intake. Compared with males, female Q-flies had higher PO activity, consumed more calories, and preferred a higher protein:carbohydrate (P:C) diet, suggesting that differential acquisition could explain sex differences. In the second experiment, we restricted flies to one of 12 diets varying in protein and carbohydrate concentrations and mapped PO activity for each sex onto a nutritional landscape. Counter to our hypothesis, females had higher PO activity than males at any given level of nutrient intake. Both carbohydrate and protein intake affected PO activity in females but only protein affected PO activity in males. Our results indicate that sex differences in Q-fly immune function are not solely explained by sex differences in nutrient intake, although nutrition does contribute to the magnitude of these sex differences.

“Pma sounds fun” : negotiating drug discourses online

 In 2007, a young woman, Annabel Catt, died after consuming a capsule sold as “ecstasy” that contained para-methoxyamphetamine. In this paper, we describe how this death was depicted in online drug-user communities and illustrate how the meanings of drug use are negotiated in online settings. News articles, public online discussions, and online fieldwork formed the data. This paper demonstrates how dominant drug discourses may be resisted by drug users, drawing on theories of health resistance and Kane Race’s concept of counterpublic health. Online environments may offer ways of engaging people who use drugs that acknowledge both pleasure and safety. The study’s limitations are noted.

Experiencing God and expressing his love through words and sounds

“The role that music plays in religion and spiritual life is evident throughout history and across cultures” (Lipe 2002, 210). Spirituality and religion are often used together and interchangeably as people may encounter spirituality through an organized religion or individualized religion; connection to nature or personal spiritual practices or people may seek scientific answers and truth as a form of spirituality. This paper situates itself within a wider study on Spirituality and Well-being: Music in the community that started in 2013 in Australia. Both authors are music educators and organists discussing their experience through narrative reflection across two continents in relation to how music contributes to spirituality within religious context and impacts on well-being. They recognize and acknowledge that music is one of God’s gifts and have been included throughout church history through songs and form an important aspect of worship (Vaught 2009). Spiritual connections are not confined to the institution of the church or to religion but are concerned with the connection “we can feel between ourselves and something vast, unseen, mysterious, and wondrous” (Millar 2000, 140). The findings of this are limited in the sense that it only focuses on two voices hence generalizations cannot be made to other musicians or church settings. However, it can be argued that music in worship can enrich and enhance one’s connection with God and with others through sound. The authors argue “music can provide many people with ways of experiencing and expressing their spirituality in their life that otherwise they might find difficult to access in other tangible ways” (Hays and Minichiello, 2005a, 95).