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Evidence showing a relationship between the mouse gut microbiome and properties such as phenotype and reaction to therapeutic agents and other treatments has increased significantly over the past 20 to 30 y. Recent concerns regarding the reproducibility of animal experiments have underscored the importance of understanding this relationship and how differences in husbandry practices can affect the gut microbiome. The current study focuses on effects of different barrier practices in 2 barrier facilities at the same institution on the fecal microbiome of breeding C57Bl/6J mice. Ten female and 10 male C57Bl/6J mice were obtained in one shipment from Jackson Laboratories and were housed under different barrier conditions upon arrival. Fecal samples were collected on arrival and periodically thereafter and were sent to TransnetYX for microbiome analysis. Mice used for collection of feces were housed as breeding pairs, with a total of 5 breeding pairs per barrier. An additional fecal sample was collected from these mice at 8 wk after arrival. One F1 female and one F1 male from each breeding cage were housed as brother-sister breeding pairs and a fecal sample was collected from them at 8 wk of age. Brother-sister breeding colonies were continued through F3, with fecal samples for microbiome analysis were collected from each generation at 8 wk of age. Breeding colonies in the 2 barriers showed differences in relative abundance, α -diversity, and β -diversity. Our data indicate that differences in barrier husbandry practices, including the use of autoclaved cages, the degree of restricted access, feed treatment practices, and water provision practices, can affect fecal microbiome divergence in both the parental and filial generations of different breeding colonies. To our knowledge, this is the first study to examine the effect of barrier husbandry practices on the microbiome of breeding colonies through the F3 generation.

Urbanization in low and middle-income nations is characterized by economic and demographic shifts largely understood to be beneficial to women’s empowerment. These changes include increased education and wage-labor opportunities, a disruption of traditional patrilocal residence systems, and reductions in spousal age gap and fertility. However, such changes may drive a “violence backlash,” with men increasing intimate partner violence (IPV) in efforts to challenge women’s shifting status. To date, tests of this idea primarily relate to women’s changing economic status, with less known about the demographic correlates of IPV in urbanizing settings. Addressing this, we conducted a cross-sectional study of IPV behavior and attitudes in an urbanizing community in Mwanza, northern Tanzania ( n = 317). Consistent with a violence backlash, IPV was reported more often among women educated at higher levels than their husband, and women earning similar, rather than lower, wages to their husband were more likely to report that he condones IPV. These findings were independent of women’s absolute education and income. Furthermore, less frequent paternal kin contact, and relatively small spousal age gaps, generally understood to boost women’s empowerment, were associated with an increased risk of experiencing IPV. Less frequent paternal kin contact was also associated with an increased likelihood that a husband condones IPV. Contrary to our predictions, relatively lower fertility, generally linked to higher women’s empowerment, did not predict IPV behavior and women with high, rather than low, fertility were more likely to report that their husband condones IPV. Overall, our results support the notion of a violence backlash corresponding to economic changes for women that accompany urbanization. In contrast, demographic changes associated with urbanization have more variable relationships. Drawing on these results, we suggest future research avenues for better understanding the vulnerability of women to IPV in urbanizing settings.

The Green Revolution has resulted in major improvements in crop productivity, but left photosynthesis largely unimproved. Despite ample variation of photosynthetic performance in crops and their wild relatives, the photosynthetic capacity of elite breeding lines remains well below its theoretical maximum. As yield is often the primary selective trait, current plant breeding approaches result in photosynthetic trade-offs that prevent positive selection for photosynthetic performance itself. Currently, genetic variation for photosynthetic performance is seldomly validated at the genetic level, and as a result these photosynthetic trade-offs remain poorly understood. Here we reveal the physiological nature of a photosynthetic trade-off caused by the NAD(P)H dehydrogenase (NDH) complex. The use of anArabidopsis thalianacybrid panel revealed how a natural allele of the chloroplastic geneNAD(P)H-QUINONE OXIDOREDUCTASE SUBUNIT 6 -a subunit of the NDH complex - results in a faster recovery of photosystem II efficiency after a transition from high to low irradiances. This improvement is due to a reduction in NDH activity. Under low-light conditions this reduction in NDH activity has a neutral effect on biomass, while under highly fluctuating light conditions, including high irradiances, more NDH activity is favoured. This shows that while allelic variation in one gene can have beneficial effects on one aspect of photosynthesis, it can, depending on environmental conditions, have negative effects on other aspects of photosynthesis. As environmental conditions are hardly ever stable in agricultural systems, understanding photosynthetic trade-offs allows us to explore shifting photosynthetic performance closer to the theoretical maximum.