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Harsh and unsupportive parenting is a risk factor for the development of disruptive behavior in children. However, little is known about how children's temperament and stress reactivity influence this relation. In a three-wave longitudinal study, we examined whether the associations between parenting practices (supportive parenting, positive discipline, and harsh discipline) and child disruptive behavior were mediated by child temperament (negative emotionality) and stress reactivity (heart rate reactivity). In 72 families (Mage child = 14.6 months), living in the Netherlands, parents reported on their parenting practices and their children's disruptive behavior and negative emotionality. Children's heart rate reactivity was assessed through a series of stress-inducing tasks. Results from regression-based mediation analyses with bootstrapping showed that negative emotionality and stress reactivity did not mediate the relation between parenting and disruptive behavior. The results overall demonstrate that in a group of children this age, a reinforcing dynamic between parenting, child stress and disruptive behavior is not yet firmly established., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2024 Huijzer-Engbrenghof, van Rijn-van Gelderen, Spencer, Wesarg-Menzel, Creasey, Lalihatu and Overbeek.)

Positive and negative parental affect influence developing parent-child attachment relationships, especially during infancy as well as children's social-emotional, academic, and behavioral functioning later in life. Increasingly, because both mothers and fathers can play central caregiving roles, the parenting qualities of both parents demand consideration. Therefore, this study investigated whether parental gender and caregiving role were associated with mothers' and fathers' positive affect and negative affect during interactions with their 4-month-old firstborn infant, while determining whether parenting stress, infant temperament, having a singleton/twin, and living in the Netherlands, France, or the United Kingdom were related to parental positive affect and negative affect. In all, 135 different-sex, same-sex male, and same-sex female couples (113 fathers and 157 mothers, comprising 147 primary, and 123 secondary caregivers) who conceived through artificial reproductive techniques were studied. The couples were videorecorded at home while in feeding, cleaning, and playing contexts to assess the levels of positive and negative parental affect. In addition, the couples completed questionnaires about their caregiving role, parenting stress, and the infants' temperament. Mixed linear models indicated that the levels of positive and negative parental affect toward the infant in all contexts were not related to parental gender, caregiving role, the interaction between parental gender and caregiving role, parenting stress, infant temperament, or singleton/twin status. However, the target parental behaviors were related to the country of origin, suggesting differences among Dutch, French, and British parents. Overall, we found no evidence that gender or caregiving roles were associated with the levels of positive and negative affect shown by the parents., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The handling editor NC declared a past co-authorship with the author HB., (Copyright © 2024 Leter, Ellis-Davies, Rubio, Vecho, Bos, Lamb and Van Rijn – Van Gelderen.)

Child temperament has long been viewed as a potential susceptibility factor in the link between parenting and child disruptive behavior (CDB). Specifically, the idea is that children with higher negative emotionality, surgency, and lower effortful control are more affected by their received parenting, but experimental evidence is scarce. Also, others have argued that child temperament might not be a susceptibility factor but a factor that can change through parents' participation in a parenting intervention. To test both hypotheses, we analyzed pretest, posttest, and 4-month follow-up data from 386 mostly Dutch parents, mainly mothers (92%; Mage = 38.1, SD = 4.8) with children (Mage = 6.31, SD = 1.33; 54.2% boys). The children had above-average disruptive behavior (i.e., ≥75th percentile Eyberg Child Behavior Inventory questionnaire; Eyberg & Pincus, 1999). The families participated in a randomized controlled trial of the Incredible Years (IY) parenting program. Hierarchical regression analyses showed that child temperament did not moderate IY intervention effects on CDB. Furthermore, parallel process analyses showed that the IY intervention led to direct, simultaneous decreases in both negative emotionality and CDB. These findings counter the widely held belief that temperament traits are static, unchangeable modulators of the links between parenting and CDB. Instead, child temperament (negative emotionality) can at least partly be influenced by parents' participation in a parenting program. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

To determine the vaporization order of (the components in) crude oils, the density, the viscosity and the chemical composition of a light and a heavy crude oil were studied as a function of the burning efficiency. An experimental series of small scale in-situ crude oil burns on water were conducted with the two crude oils. Chemical analyses of the burned residues showed that the components in crude oils vaporize in order of decreasing volatility and the depletion rate of components generally decreased with increasing molecular mass. Ultimately, this means that the burning efficiency of a crude oil burning on water can be related to fire dynamics principles, irrespective of its chemical and physical properties. The relative abundance of pyrogenic PAHs in the burned residues increased up to a maximum of 2600% for the light crude oil and 9100% for the heavy crude oil. Increased abundances of the pyrogenic PAHs were caused by the formation of the pyrogenic PAHs during the burning and not by an increase in concentration in the burned residues. Overall, the results provide relevant data for predicting the effectiveness of in-situ burning of crude oil as oil spill response method, both in terms of its burning efficiency and its environmental impact., (Copyright © 2021 Elsevier Ltd. All rights reserved.)

Background: The division of non-paid labor in heterosexual parents in the West is usually still gender-based, with mothers taking on the majority of direct caregiving responsibilities. However, in same-sex couples, gender cannot be the deciding factor. Inspired by Feinberg's ecological model of co-parenting, this study investigated whether infant temperament, parent factors (biological relatedness to child, psychological adjustment, parenting stress, and work status), and partner relationship quality explained how first-time gay, lesbian, and heterosexual parents divided labor (childcare and family decision-making) when their infants were 4 and 12 months old. We also tested whether family type acted as a moderator. Method: Participants were drawn from the new parents study. Only those who provided information about their biological relatedness to their child ( N = 263 parents) were included. When infants were 4 months (T1), parents completed a password-protected online questionnaire exploring their demographic characteristics including work status and standardized online-questionnaires on task division (childcare and family decision-making), infant temperament, parental anxiety, parental depression, parental stress, and partner relationship satisfaction. When infants were 12-months-old (T2), parents provided information about task division and their biological relatedness to their children. Results: Linear mixed models showed that no factor explained the division of family decision making at T1 and T2. For relative time spent on childcare tasks at T1, biological relatedness mattered for lesbian mothers only: biologically related mothers appeared to spend more time on childcare tasks than did non-related mothers. Results showed that, regardless of family type, parents who were not working or were working part-time at T1 performed more childcare tasks at T1. This was still true at T2. The other factors did not significantly contribute to relative time spent on childcare tasks at T2. Conclusion: We had the opportunity to analyze the division of non-paid tasks in families where parenting was necessarily planned and in which gender could not affect that division. Although Feinberg's model of co-parenting suggests that various factors are related to task division, we found that paid work outside the home was most important during the first year of parenthood in determining caregiving roles., (Copyright © 2020 Van Rijn - Van Gelderen, Ellis-Davies, Huijzer-Engbrenghof, Jorgensen, Gross, Winstanley, Rubio, Vecho, Lamb and Bos.)

Until 2004, Dutch women seeking donor insemination through medical facilities could opt for open-identity or anonymous donors. Since then, Dutch law only permits open-identity donation. The present study compared the well-being of adolescents conceived before 2004 through known, open-identity, and anonymous donors, and born into planned lesbian parent families (i.e., the mothers identified as lesbian before the children were conceived). The sixty-seven participating adolescents ( M age = 16.04 years) completed the Rosenberg Self-Esteem Scale and the Youth Self-Report, and answered questions about their donor. Thirty-three were conceived through known, twenty-two through open-identity, and twelve through anonymous donors. No significant associations were found between donor type and self-esteem or problem behavior. Likewise, no significant differences were found on these two variables for adolescents with known donors who did or did not play important roles in their lives. For adolescents conceived with sperm from as-yet unknown donors (open-identity or anonymous), feeling uncomfortable about not knowing the donor was associated with lower self-esteem and more externalizing problem behavior. That donor type was found to have no bearing on adolescent self-esteem or problem behavior may be useful to prospective lesbian parents.

There is consensus in the literature that self-esteem stems from relationships with others. In particular, it is assumed that parents play an important role in the development of children's self-esteem, also in adolescence. Despite the importance of parent-child attachment relationships for adolescents' self-esteem, we know very little about the extent to which fathers and mothers uniquely contribute to adolescents' self-esteem. The current study aims to contribute to acquiring knowledge in this research area in three ways. First, by separating the potential influences of father-child and mother-child attachment relationships on sons' and daughters' self-esteem, the current study is able to investigate the individual contribution of the father-child and mother-child attachment relationship to female and male adolescent's self-esteem. Second, by controlling for changes in the quality of the parental relationship and peer relationships the current study is able to isolate linkages between changes in adolescents' perceived quality of the parent-child attachment relationships and changes in adolescents' self-esteem. Third, by using longitudinal data and solely analyzing within-person variation, the current study is able to rule out stable confounding factors as alternative explanations. Self-reports of 542 adolescents (mean age at T1 = 13.6 years, percentage female = 0.51) from all three waves of the Dutch cohort study Social Development of Adolescents were used. The longitudinal fixed effects models showed that, for both sons and daughters, changes in the perceived quality of the mother-adolescent attachment relationship and changes in the perceived quality of the relationship between adolescents' parents were positively linked with changes in self-esteem. Changes in the perceived quality of the attachment relationship with father were only significantly linked to changes in daughters' self-esteem, not in that of sons. Contrary to the expectations, changes in peer relationships were not associated with changes in adolescents' self-esteem. These findings suggest that even though adolescents may be increasing their time spent with friends and romantic partners, perceived changes in the attachment relationships with fathers and mothers and in the wider family system are highly important for how adolescents think of and judge themselves.

Chirality at the central element of pentacoordinate systems can be controlled with two identical bidentate ligands. In such cases the topological Levi-Desargues graph for all the Berry pseudorotations (BPR, max. 20) reduces to interconnected inner and outer "circles" that represent the dynamic enantiomer pair. High enough barriers of the BPR crossovers between the two circles is all what is needed to ascertain chiral integrity. This is illustrated computationally and experimentally for the organosilicates 7 and 10 that carry besides a Me (a), Et (b), Ph (c), or F (d) group two bidentate 2-(phenyl)benzo[ b]-thiophene or 2-(phenyl)naphthyl ligands, respectively. The enantiomers of tetraorganosilane precursor 9 could be separated by column chromatography. Their chiral integrity persisted on forming the silicates. CD spectra are reported for 10c. Fluoro derivative 10d is shown to have its electronegative F substituent in an equatorial position, is stable toward hydrolysis, and its enantiomers do not racemize at ambient temperatures, while those of 10c racemize slowly.

A new method for the simultaneous study of the flammability and burning efficiency of fresh and weathered crude oil through two experimental laboratory setups is presented. The experiments are easily repeatable compared to operational scale experiments (pool diameter ≥2 m), while still featuring quite realistic in situ burning conditions of crude oil on water. Experimental conditions include a flowing water sub-layer that cools the oil slick and an external heat flux (up to 50 kW/m 2 ) that simulates the higher heat feedback to the fuel surface in operational scale crude oil pool fires. These conditions enable a controlled laboratory study of the burning efficiency of crude oil pool fires that are equivalent to operational scale experiments. The method also provides quantitative data on the requirements for igniting crude oils in terms of the critical heat flux, ignition delay time as a function of the incident heat flux, the surface temperature upon ignition, and the thermal inertia. This type of data can be used to determine the required strength and duration of an ignition source to ignite a certain type of fresh or weathered crude oil. The main limitation of the method is that the cooling effect of the flowing water sub-layer on the burning crude oil as a function of the external heat flux has not been fully quantified. Experimental results clearly showed that the flowing water sub-layer does improve how representative this setup is of in situ burning conditions, but to what extent this representation is accurate is currently uncertain. The method nevertheless features the most realistic in situ burning laboratory conditions currently available for simultaneously studying the flammability and burning efficiency of crude oil on water.

The average herded slick thickness, surface distribution and burning efficiency of a light crude oil were studied in ice-infested water to determine the effectiveness of a chemical herder in facilitating the in-situ burning of oil. Experiments were performed in a small scale (1.0m 2 ) and an intermediate scale (19m 2 ) setup with open water and 3/10, 5/10 and 7/10 brash ice coverages. The herded slick thicknesses (3-8mm) were ignitable in each experiment. The presence of ice caused fracturing of the oil during the herding process, which reduced the size of the herded slicks and, as a consequence, their ignitability, which in turn decreased the burning efficiency. Burning efficiencies relative to the ignited fraction of the oil were in the expected range (42-86%). This shows that the herder will be an effective tool for in-situ burning of oil when the ignitability issues due to fracturing of the oil are resolved., (Copyright © 2016 Elsevier Ltd. All rights reserved.)

Objective: Using the 2011-2012 National Survey of Children's Health data set, we compared spouse/partner relationships and parent-child relationships (family relationships), parenting stress, and children's general health, emotional difficulties, coping behavior, and learning behavior (child outcomes) in households of same-sex (female) versus different-sex continuously coupled parents with biological offspring. We assessed whether associations among family relationships, parenting stress, and child outcomes were different in the 2 household types., Methods: Parental and child characteristics were matched for 95 female same-sex parent and 95 different-sex parent households with children 6 to 17 years old. One parent per household was interviewed by telephone. Multivariate analyses of variance and multiple linear regressions were conducted., Results: No differences were observed between household types on family relationships or any child outcomes. Same-sex parent households scored higher on parenting stress (95% confidence interval = 2.03-2.30) than different-sex parent households (95% confidence interval = 1.76-2.03), p = .006. No significant interactions between household type and family relationships or household type and parenting stress were found for any child outcomes., Conclusion: Children with female same-sex parents and different-sex parents demonstrated no differences in outcomes, despite female same-sex parents reporting more parenting stress. Future studies may reveal the sources of this parenting stress.

Background: Risk assessment is crucial in preventing child maltreatment as it can identify high-risk cases in need of child protection intervention. Despite this importance, there have been no validated risk assessment instruments available in the Netherlands for assessing the risk of child maltreatment. Therefore, the predictive validity of the California Family Risk Assessment (CFRA) was examined in Dutch families who received family support. In addition, the added value of a number of experimental items was examined. Finally, it was examined whether the predictive value of the instrument could be improved by modifying the scoring procedure., Methods: Dutch families who experienced parenting and/or child developmental problems and were referred by the Centres for Youth and Family for family support between July 2009 and March 2011 were included. This led to a sample of 491 families. The predictive validity of the CFRA and the added value of the experimental items were examined by calculating AUC values. A CHAID analysis was performed to examine whether the scoring procedure could be improved., Results: About half of the individual CFRA items were not related to future reports of child maltreatment. The predictive validity of the CFRA in predicting future reports of child maltreatment was found to be modest (AUC = .693). The addition of some of the experimental items and the modification of the scoring procedure by including only items that were significantly associated with future maltreatment reports resulted in a 'high' predictive validity (AUC = .795)., Conclusions: This new set of items might be a valuable instrument that also saves time because only variables that uniquely contribute to the prediction of future reports of child maltreatment are included. Furthermore, items that are perceived as difficult to assess by professionals, such as parental mental health problems or parents' history of abuse/neglect, could be omitted without compromising predictive validity. However, it is important to examine the psychometric properties of this new set of items in a new dataset.

In this study, we compared internalizing and externalizing problem behavior of 67 Dutch adolescents (M(age) = 16.04) in planned lesbian families who were matched with 67 adolescents in heterosexual-parent families. We also examined whether homophobic stigmatization was associated with problem behavior in adolescents with lesbian mothers after taking into account demographic characteristics, mothers' scores on emotional involvement, and adolescents' earlier problem behavior (measured at age 4-8 years old). Standardized instruments measuring problem behavior were completed by parents and adolescent offspring, and questions about stigmatization were answered by adolescents with lesbian mothers. The results revealed no differences in internalizing and externalizing problem behavior associated with family type. Offspring in lesbian families who reported more experiences of homophobic stigmatization also demonstrated more internalizing and externalizing problem behavior., (Copyright © 2015 The Foundation for Professionals in Services for Adolescents. Published by Elsevier Ltd. All rights reserved.)

Objective: To assess whether lesbian mothers of 17-year-old adolescents conceived through donor insemination are satisfied with their choice of a known, open-identity, or unknown sperm donor and whether the mothers' satisfaction is associated with psychological health problems in the index adolescent offspring., Design: Mixed-method study., Setting: Not applicable., Patient(s): One hundred twenty-nine lesbian mothers and 77 index offspring., Intervention(s): Semistructured interviews with the mothers conducted by telephone and the State-Trait Personality Inventory (STPI) completed online by the adolescent offspring., Main Outcome Measure(s): Satisfaction with the type of sperm donor selected was assessed through multiple choice questions, and adolescent psychological health problems by the STPI. The reasons for the mothers' (dis)satisfaction were evaluated through a thematic analysis of transcribed interviews., Result(s): Overall, 77.5% of mothers were satisfied with the type of donor chosen. There were no significant differences between birth mothers and comothers on (dis)satisfaction. In comparing satisfied with dissatisfied birth mothers by donor type, the only significant differences were that those selecting open-identity donors were more satisfied than dissatisfied and that those using unknown donors were more dissatisfied than satisfied; (dis)satisfaction with donor type was unrelated to offspring psychological health problems. Qualitative analyses revealed six themes concerning all mothers' reasons for (dis)satisfaction., Conclusion(s): Donor access and custody concerns were the primary themes mentioned by lesbian mothers regarding their (dis)satisfaction with the type of sperm donor they had selected., (Copyright © 2015 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.)