Maternal Labor Market Return, Parental Leave Policies, and Gender Inequality in Housework

This study investigates how the duration of the work interruption and the labor market status of mothers upon their return affect the division of housework in couples after a birth. By observing several parental leave policy reforms in Britain and West-Germany, this research also explores how extended leave entitlements for mothers influence the division of housework. The analysis uses multilevel multiprocess models for 1220 birth events of British couples and 1785 births to German couples based on data from the British Household Panel Survey (1991-2008) and the German Socio-Economic Panel (1985-2009). The results suggest that mothers increase their housework hours with every additional month of employment interruption. Mothers' full-time return seems more effective than a short labor market time-out in altering men's housework contributions and reducing the trend towards a more traditional division of housework. Parental leave policy extensions for mothers were associated with the division of housework only indirectly through their impact on the length of women's work interruptions.Parenthood, parental leave policy, maternal employment, housework, gender division of labor, Britain, Germany

Mixed-integer Quadratic Programming is in NP

Mixed-integer quadratic programming is the problem of optimizing a quadratic function over points in a polyhedral set where some of the components are restricted to be integral. In this paper, we prove that the decision version of mixed-integer quadratic programming is in NP, thereby showing that it is NP-complete. This is established by showing that if the decision version of mixed-integer quadratic programming is feasible, then there exists a solution of polynomial size. This result generalizes and unifies classical results that quadratic programming is in NP and integer linear programming is in NP

Daddy Leave: Does It Change the Gender Division of Domestic Work?

How to best provide incentives for a more gender-equal division of domestic work has entered policy debates in many Western countries. Growing evidence suggests that a gender-traditional division of household labor may result in lower fertility rates and greater risk of relationship breakdown and correlates with gender employment and wage gaps. Partly in response, many European countries have implemented some individual parental leave entitlements for fathers, which are not transferrable to mothers. Such non-transferable entitlements for fathers have been consistently shown to increase take-up of (short) leaves by fathers. Whether leave take-up indeed increases fathers’ involvement in child care and housework also in the long-term is a more contested question. This DIW Roundup describes potential mechanisms that may underlie such a change and provides an overview of the existing evidence. Overall, previous studies from different countries point to some longer-term effects of fathers taking more than a couple of weeks of leave on a more equal gender division of domestic work

New models for PIXE simulation with Geant4

Particle induced X-ray emission (PIXE) is a physical effect that is not yet adequately modelled in Geant4. The current status as in Geant4 9.2 release is reviewed and new developments are described. The capabilities of the software prototype are illustrated in application to the shielding of the X-ray detectors of the eROSITA telescope on the upcoming Spectrum-X-Gamma space mission.Comment: To be published in the Proceedings of the CHEP (Computing in High Energy Physics) 2009 conferenc

Increasing father involvement in child care: What do we know about effects on child development?

The time fathers spend and the activities they perform with children have risen continuously in most Western countries. Increasing father involvement in child care has also been an explicit policy objective with many European countries implementing individual parental leave entitlements for fathers. Whereas these policies mainly aimed at facilitating reconciliation of market work and family care and promoting maternal employment, consequences for child development have received less attention in the policy debate. This DIW Roundup describes potential mechanisms how increased father involvement in child care may impact children's development in different domains and provides an overview of the existing empirical evidence. Overall, previous studies generally point to some moderate positive effects of fathers involvement, in particular when father-child-activities and -relationships are stimulating and of high quality and distinct from mother-child activities or maternal parenting styles

Maternal Labor Market Return, Parental Leave Policies, and Gender Inequality in Housework

This study investigates how the duration of the work interruption and the labor market status of mothers upon their return affect the division of housework in couples after a birth. By observing several parental leave policy reforms in Britain and West-Germany, this research also explores how extended leave entitlements for mothers influence the division of housework. The analysis uses multilevel multiprocess models for 1220 birth events of British couples and 1785 births to German couples based on data from the British Household Panel Survey (1991-2008) and the German Socio-Economic Panel (1985-2009). The results suggest that mothers increase their housework hours with every additional month of employment interruption. Mothers' full-time return seems more effective than a short labor market time-out in altering men's housework contributions and reducing the trend towards a more traditional division of housework. Parental leave policy extensions for mothers were associated with the division of housework only indirectly through their impact on the length of women's work interruptions

Shared and Distinct Features of Human Milk and Infant Stool Viromes.

Infants acquire many of their microbes from their mothers during the birth process. The acquisition of these microbes is believed to be critical in the development of the infant immune system. Bacteria also are transmitted to the infant through breastfeeding, and help to form the microbiome of the infant gastrointestinal (GI) tract; it is unknown whether viruses in human milk serve to establish an infant GI virome. We examined the virome contents of milk and infant stool in a cohort of mother-infant pairs to discern whether milk viruses colonize the infant GI tract. We observed greater viral alpha diversity in milk than in infant stool, similar to the trend we found for bacterial communities from both sites. When comparing beta diversity, viral communities were mostly distinguishable between milk and infant stool, but each was quite distinct from adult stool, urine, and salivary viromes. There were significant differences in viral families in the infant stool (abundant bacteriophages from the family Siphoviridae) compared to milk (abundant bacteriophages from the family Myoviridae), which may reflect significant differences in the bacterial families identified from both sites. Despite the differences in viral taxonomy, we identified a significant number of shared viruses in the milk and stool from all mother-infant pairs. Because of the significant proportion of bacteriophages transmitted in these mother-infant pairs, we believe the transmission of milk phages to the infant GI tract may help to shape the infant GI microbiome

Management of exercise-induced glycaemic imbalances in type 1 diabetes

Regular moderate-intensity exercise is strongly recommended for its beneficial effects in all people. In patients with type 1 diabetes, however, the exercise-associated glycemic imbalances remain an unresolved clinical challenge. Current guidelines require an in-depth understanding of the glycemic responses to exercise and each patient has to discover, by trial-and-error, his/her own strategy, several attempts being usually required to gain sufficient experience. Consequently, fear of hypoglycemia remains the strongest barrier to physical activity. This paper explores the potential strategies that may be employed to minimize the risk of exercise related glycemic imbalances. Moreover, a newly developed algorithm (ECRES, Exercise Carbohydrate Requirement Estimating Software) is described, which estimates on a patient-and situation-specific basis the glucose supplement required by the patient to maintain safe blood glucose levels. The algorithm was tested on 27 patients who performed three 1-hr constant intensity walks (each starting at a different time interval following insulin injection). Results showed that in 70.4% of the trials, independent of the time of day, the algorithm provided a satisfactory estimate of the carbohydrates needed by patients to complete the exercise with a glucose level within safe thresholds (i.e. 3.9 - 10 mmol\ub7L -1). Despite the algorithm requires further experimental testing to be applied by the majority of patients, these results indicate its potential usefulness as a tool for preventing immediate exercise-induced glycemic imbalances (i.e. during exercise) in type 1 diabetic patients, in particular for spontaneous activities not planned in advance, thus allowing all insulin-dependent patients to safely enjoy the benefits of exercise