Daily rhythm of salivary IL-1ß, cortisol and melatonin in day and night workers

Shiftwork-induced sleep deprivation and circadian disruption probably leads to an increase in the production of cytokines and dysregulation of innate immune system, respectively. This project aims evaluating changes in salivary IL-1 beta, cortisol, and melatonin in night workers. Method. Two day and three night healthy workers participated in this study. Sleep was evaluated by actimetry and activity protocols. Saliva was collected at waking and bedtime the last workday and the following two days-off and was analyzed by ELISA. Results. Neither sleep duration nor efficiency showed any association with salivary IL-1beta. IL-1beta levels were higher at waking than at bedtime during working days for all workers, but only one day and one night-worker maintained this pattern and hormone rhythms during days off. For this night worker, melatonin levels were shifted to daytime. A second one presented clear alterations in IL-1beta and hormone rhythms on days-off. Conclusions. Our preliminary results suggest that night work can disturb the variation pattern of salivary IL-1beta. No association of this variation with sleep was observed. It seems that disruption in hormone rhythms interfere with salivary IL-1beta production. IL- 1beta production pattern seems to be maintained when rhythms are present, in spite of a shift in melatonin secretion.     

Attitude towards gender norms in Ghana: understanding the dynamics among men and women in intimate relationships

Journal of Population Research - Despite the growing interest in issues relating to gender norms, few studies have targeted men and women in intimate relationships. Using the Gender Equitable Men...     

Ambient air pollution and children’s cognitive outcomes

Population and Environment - Ambient air pollution remains a serious public health concern, with growing literature linking higher concentrations to adverse health effects among children....     

Fertility effects of child benefits

We exploit the 1996 reform of the German child benefit program to identify the causal effect of heterogeneous child benefits on fertility. While generally the reform increased child benefits, the exact amount of the increase varied by household income and the number of children. We use these heterogeneities to identify their causal effects on fertility in a difference-in-difference setting. We apply the large samples of the German Mikrozensus and the rich data of the German Socio-Economic Panel (SOEP). The reform effects on low-income couples are not statistically significant. We find some support for positive fertility effects for higher as opposed to lower income couples deciding on a second birth.     

How to be heard on microblogs? Nonprofit organizations' follower networks and post features for information diffusion in China

This study tackles the gap in public relations research on what drives users of microblogs in China to follow nonprofit organization (NPO) accounts and share (retweet) their posts, from a multidimensional perspective of the NPO, the microblog audience, and the post features. Using a content analysis of Sina Weibo data of 95 NPO accounts, results suggested that an NPO's status on Weibo is a significant predictor of its follower number. Follower numbers and activeness directly affected the NPO's number of retweets. Informative posts and posts that fulfill multiple gratifications were found to be more sharable than other post types. In addition, a post's originality, media richness, inclusion of opinion leaders, and endorsement by influential users all contributed to its level of circulation. This knowledge is essential for NPOs to spread information and build online communities that facilitate dialogic engagement and quality organization–public relationships with their stakeholders on social media in China's context.     

Fertility assimilation of immigrants: Evidence from count data models

This study applies count data estimation techniques to investigate the fertility adjustment of immigrants in the destination country. Data on completed fertility are taken from the 1996 wave of the German Socioeconomic Panel (GSOEP). While the economic literature stresses the role of prices and incomes as determinants of fertility, the demographic literature discusses whether assimilation or disruption effects dominate immigrants' fertility after migration. We find evidence in favor of the assimilation model according to which immigrant fertility converges to native levels over time. In addition, we confirm the negative impact of female human capital on fertility outcomes. Received: 7 January 1999/Accepted: 10 August 1999